Screw Feeder Patents (Class 425/587)
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Publication number: 20070296121Abstract: Disclosed are: (i) a molding-system drive, and (ii) a molding system having a molding-system drive, amougst other things.Type: ApplicationFiled: June 7, 2006Publication date: December 27, 2007Inventor: Christopher Wai-Ming Choi
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Patent number: 7306447Abstract: Disclosed is an injection unit (1) for an injection molding machine, comprising a screw (4) that is driven by means of a spindle drive (18). The spindle drive (18) is driven via an electric motor (6). Additionally, a force that acts in an axial direction is transmitted to the screw of the injection unit (1) via a hydraulic cylinder (38). According to the invention, a pump (48, 68) is driven via the electric motor (6). A pressure chamber (44) of the cylinder (38) can be supplied with more pressurizing means via said pump (48, 68) than is needed during an axial displacement of the plunger (36).Type: GrantFiled: November 10, 2004Date of Patent: December 11, 2007Assignee: Bosch Rexroth AGInventor: Joerg Dantlgraber
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Patent number: 7293982Abstract: Foamed molded articles can be produced during an injection molding process, among other things, by utilizing physical blowing agents. Existing technologies differ to the greatest possible extent in the manner how the blowing agent is introduced into the melt. One possibility is to supply the blowing agent via mixing elements (9) from porous or permeable material that are provided across the screw piston (1) and which by means of a suitable blowing agent input unit load and homogeneously charge the melt with blowing agent during the metering phase of the polymeric material. The resulting single phase polymer/blowing agent mixture, when injected in to an injection mold tool, produces due to a reduction in pressure, a foam-textured part.Type: GrantFiled: October 9, 2003Date of Patent: November 13, 2007Assignee: Peguform GmbHInventor: Christian Schlummer
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Patent number: 7291297Abstract: In a reciprocating (RS) injection unit environment, as shown in FIG. 1, a controller of the injection unit is arranged to continuously rotate the screw during both conventional plasticizing operation and shot injection. In this way the RS unit is more efficient, utilizing less energy and producing greater resin output. The injection unit includes a non-return valve adjacent a nozzle, which non-return valve is either configured to rotate with the screw to reduce wear or presented as a ball check style noon-return valve. In an injection molding environment, the rotating screw includes flights that allow granules of resin to melt and mix in spaces between adjacent flights, but the flights are arranged substantially to inhibit excessive displacement of resin around the flights.Type: GrantFiled: January 23, 2004Date of Patent: November 6, 2007Assignee: Husky Injection Molding Systems Ltd.Inventors: Douglas James Weatherall, Alexandre Edouard Raoul Paris
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Patent number: 7261554Abstract: An injection unit in which an offset load is not applied to a ball screw for moving an injection screw. A pusher plate is provided that is moved while being guided by guide rods extending between front and rear plates, and is mounted with the injection screw and the ball screw so as to be rotatable but axially immovable. The ball screw is threadedly engaged with a nut mounted to the rear plate so as to be unrotatable and axially immovable. A support plate is coupled through coupling rods to the pusher plate. The ball screw has another end supported on the support plate in a rotatable but axially immovable manner. The pusher and support plates are supported on a base by linear motion guides. The ball screw is supported at its both ends by the pusher and support plates so as not to be tilted, whereby no offset load is produced and the service life is prolonged.Type: GrantFiled: March 18, 2005Date of Patent: August 28, 2007Assignee: Fanuc LTDInventors: Koichi Nishimura, Koji Shima
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Publication number: 20070195640Abstract: Device for moving in the longitudinal direction a shaft with screw rotationally driven by a motor, comprising at least one cylinder coaxial with said shaft and provided with at least one rotating piston rigidly connected to the shaft and able to produce a displacement in either direction of the shaft from a first retracted end-of-travel position into a second advanced end-of-travel position, and vice versa.Type: ApplicationFiled: February 21, 2007Publication date: August 23, 2007Inventors: Loris De Leonardis, Michele Mora
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Publication number: 20070176313Abstract: In a molding method of a fiber filler reinforced resin molded article, in which a reinforcement fiber and a resin are plasticized and kneaded in a material supply cylinder including a screw with an anti counterflow portion, and the resin with the reinforcement fiber mixed therewith is injected into a cavity of a mold, the reinforcement fiber is mixed with the resin in the cylinder at a portion downstream of the anti counterflow portion of the screw, and a physical foaming agent is supplied into the cylinder at a portion downstream of the anti counterflow portion. Accordingly, there can be provided a molding method or apparatus of a fiber filler reinforced resin molded article that can improve properties by preventing the reinforcement fiber from being broken.Type: ApplicationFiled: December 8, 2006Publication date: August 2, 2007Inventors: Junichi Ogawa, Mitsuharu Kaneko, Youhei Ichihara, Takahiro Tochioka
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Patent number: 7241132Abstract: A screw tip is provided in front of a screw with a shaft interposed therebetween, and a check ring is fitted around the shaft. The check ring is separated from a front end portion of the screw when the screw is rotated in a forward direction. The check ring contacts the front end portion of the screw when the screw is advanced. A front end surface of the check ring is provided with teeth, and a rear end surface of the screw tip is provided with grooves with which the respective teeth are engaged. Respective one side surfaces of the grooves and the teeth which are pressed against each other when the screw is rotated in the forward direction are formed vertical to the front end surface of the check ring, and side surfaces thereof located on the reverse sides of the above respective one side surfaces are inclined.Type: GrantFiled: November 24, 2004Date of Patent: July 10, 2007Assignee: Toshiba Kikai Kabushiki KaishaInventors: Haruyuki Matsubayashi, Keisuke Mori, Shigehiro Saitou
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Patent number: 7223093Abstract: A screw shaft for driving an injection screw driving body in a motor-driven injection device is coupled to a motor shaft of an electric motor in engagement of splines. A spline for the motor shaft engaging with a spline disposed at the outer periphery at a shaft end of the screw shaft is fitted into a recess formed inside of a motor shaft end. A flange formed around the spline is clamped at end face of the motor shaft via a bolt, and is formed at the inner periphery of a bearing sleeve detachably mounted to the motor shaft. An annular groove is formed at the inner periphery of an opening of the bearing sleeve for the side of the screw shaft. A ring member for air-tightly sealing a clearance formed between the screw shaft and the bearing sleeve is fitted into the annular groove. The spline for the motor shaft engaging with the spline on the screw shaft is disposed at the inner periphery of the bearing sleeve independent of the motor shaft, thus achieving the coupling via the respective splines of the motors.Type: GrantFiled: December 9, 2003Date of Patent: May 29, 2007Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Kinji Yokoya, Hiroshi Yamaura, Hiroo Okubo
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Patent number: 7223086Abstract: A golf ball manufacturing apparatus comprises a mold including a cavity for forming a golf ball, an injection molding machine for supplying a molten resin to the mold, a supply portion for supplying a resin pellet to the injection molding machine, and a crushing machine for crushing a residue discharged from the mold, thereby fabricating a regenerating pellet. The supply portion includes a main cylinder (11), a cylinder (13) for a regenerating pellet and a cylinder (15) for a virgin pellet which branch upward. An inclination angle (u) to a vertical line of the cylinder (13) is equal to or smaller than 20 degrees. An inclination angle (f3) to a vertical line of the cylinder (15) is 30 to 60 degrees. The crushing machine is coupled to the cylinder (13), and the regenerating pellet is transferred to the main cylinder (11) through the cylinder (13).Type: GrantFiled: July 6, 2004Date of Patent: May 29, 2007Assignee: SRI Sports LimitedInventors: Satoru Komatsu, Teruo Kajiwara
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Patent number: 7198481Abstract: An injection unit of an injection molding machine capable of preventing a displacement of an axis of a heating barrel and an axis of an injection screw and facilitating a nozzle axis adjustment. A front plate supporting a heating barrel is fixed to a base with a height-adjusting mechanism located in-between. A rear plate is connected to the front plate by connecting members symmetrically arranged. The injection screw inserted in the heating barrel is rotatably supported by a pusher plate to which a ball nut is fixed. A ball screw engaged with the ball nut is rotatably supported by the rear plate. The pusher plate is supported and guided by the support/guide member, and moves forward to inject resin by the rotation of the ball screw. The support/guide member is supported by a supporting member fixed to the front plate.Type: GrantFiled: April 7, 2005Date of Patent: April 3, 2007Assignee: Fanuc LtdInventors: Katsuyuki Yamanaka, Koichi Nishimura, Koji Shima
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Patent number: 7147450Abstract: An injection apparatus comprises a screw drive shaft, a motor which generates torque to rotate the screw, a speed reducer, and a power transmission mechanism. The power transmission mechanism has a first pulley on an output shaft of the motor, a second pulley on an input shaft of the speed reducer, and a belt passed around the first and second pulleys. The speed reducer is located between the second pulley and the screw drive shaft. The speed reducer is formed of a planetary gear mechanism, and both its input and output shafts are situated on an extension of an axis of the screw drive shaft.Type: GrantFiled: July 21, 2003Date of Patent: December 12, 2006Assignee: Toshiba Machine Co., Ltd.Inventors: Toshihiro Kasai, Kazuhito Kobayashi, Junsuke Kawai
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Patent number: 7112057Abstract: An injection unit for a plastic injection molding machine having a screw, having a motion spindle as first drive element, via which the screw can be rotationally driven for the plasticization and is movable in the axial direction for the injection, having a spindle nut as second drive element, which is coupled to the motion spindle via a motion screw thread, having a large electric motor which is arranged so as to be fixed to the frame and by which, while one drive element is held against rotation, the other drive element can be rotationally driven for moving the screw during the injection, and having a device which is arranged so as to be fixed to the frame and by which a rotational speed of the one drive element can be preset during the plasticization, this rotational speed being different from the rotational speed at which the large electric motor simultaneously drives the other drive element.Type: GrantFiled: April 28, 2001Date of Patent: September 26, 2006Assignee: Bosch Rexroth AGInventor: Jörg Dantlgraber
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Patent number: 7090477Abstract: An electromagnetic coaxial driving injection apparatus, having a linear motor for driving injection and a rotation motor for metering. The linear motor and the rotation motor of both the injection and metering motors and an injection screw are set on a common axis. A connecting device connects moving parts of the motors with the injection screw. Stationary parts of the motors are fastened on a frame and forward-backward moving unit, not moving during injection and metering. Due to the arrangement of the moving parts and the injection screw on a single axis, moving parts are lessened, and transmission losses are minimized. Since the number of structural parts is low, only the moving parts of the motors move during injection while the stationary parts thereof remain at rest, thus greatly reducing inertia.Type: GrantFiled: April 1, 2003Date of Patent: August 15, 2006Assignee: Industrial Technology Research InstituteInventors: Chia-Chun Hsu, Yong-Chen Chung, Chia-Hung Lin, Wen-Hung Feng, Ming-Chi Chen
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Patent number: 7074032Abstract: An injection mechanism for an injection molding machine includes a front plate carrying an injection cylinder. A guide rod is arranged fixedly relative to the front plate, and defines a longitudinal guiding axis. A movable plate is arranged movably relative to said front plate along said guiding axis, and carries an injection screw. A support structure is interposed between the guide rod and the movable plate, and movably supports the movable plate on the guide rod along the guiding axis. The support structure including a ball-engaging surface is provided on the guide rod and a ball-spline nut is provided in the movable plate. The ball-spline nut is engaged with the ball-engaging surface.Type: GrantFiled: June 4, 2004Date of Patent: July 11, 2006Assignee: Fanuc LTDInventors: Mitsushi Yoshioka, Koji Senda
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Patent number: 7004743Abstract: An installation for the treatment and further processing of thermoplastics comprises a screw-type compounding unit, downstream of which is disposed an intermittently drivable processing unit. Provision is made for a control unit which is connected with a drive of the screw-type compounding unit and with the drive of a metering device and with a drive of the processing unit. The control unit is designed for triggering the drives by the cycle time of the processing unit, the drives having identical run-up times and identical deceleration times.Type: GrantFiled: April 11, 2001Date of Patent: February 28, 2006Assignee: Krupp Werner & Pfleiderer GmbH & Co. KGInventors: Klaus Kapfer, Daniel Schwendemann
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Patent number: 6994540Abstract: In a conventionally used injection molding apparatus, undried resin pellet is put in a drier of a predetermined temperature and water and gas in the undried resin pellet is completely removed, and the dried pellet deprived of water and gas is thrown into the injection molding apparatus. It is therefore necessary to carefully control quality of water and gas of pellet before pellet is thrown into the injection molding apparatus. In injection molding of undried resin pellet, evaluate injected resin, control operation conditions such as the feeding amount of pellet and the decompression degree, and determine the best operation conditions and the best accumulation amount wherein excellent articles are obtained. The accumulation amount of pellet fed in an injection molding chamber is detected, and feeding to the injection molding chamber is controlled upon the detection information.Type: GrantFiled: November 19, 2001Date of Patent: February 7, 2006Assignee: Haruna Co., Ltd.Inventor: Tsuyoshi Asano
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Patent number: 6921190Abstract: An injection screw and barrel for small injection molding shots employs separate plunger and flight sections so that the plunger section may be arbitrarily reduced in diameter without adversely affecting the threaded portion of the flight section. Melt passes from the flight section to a metering area through a hollow bore in the plunger section.Type: GrantFiled: April 22, 2003Date of Patent: July 26, 2005Assignee: MGS Mfg. Group Inc.Inventors: Loren Albrecht, John J. Hahn
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Patent number: 6875393Abstract: A method for injection moulding, comprising introducing, under pressure, a melt into a cavity (14) defined by two mould halves (10, 11) of a mould (6). The method is characterized by the steps of joining the mould halves (10, 11), for definition of said cavity (14), by moving at least one of the mould halves (11) along a first axis, and, by moving along a second axis extending transversely of said first axis, arranging a locking means (7) on the mould (6). The locking means (7) has locking surfaces (19) which grasp the mould (6) and its joined mould halves (10, 11), at least one locking surface (19) wedgingly engaging a complementarily designed surface (17) of the mould (6) to cause conversion of the force by which the locking means (7) is arranged on the mould (6), into a locking force for holding together the mould halves (10, 11) in their joined state. The present invention also concerns an injection moulding assembly as well as a mould for injection moulding assemblies.Type: GrantFiled: January 8, 2002Date of Patent: April 5, 2005Assignee: Nolato ABInventor: Lars Persson
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Publication number: 20040265419Abstract: An injection molding compounder includes an extruder with an extruder housing and at least one extruder screw rotatably arranged in the housing, for production of melt, and an injection device is fluidly connectable to the outlet of the extruder. An accumulator for temporarily storing melt is connected to the extruder housing in conveying direction of the extruder at a location upstream of the outlet in an area of the extruder screw so that melt produced in the extruder can be stored in the accumulator.Type: ApplicationFiled: May 17, 2004Publication date: December 30, 2004Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventor: Walter Wohlrab
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Publication number: 20040253335Abstract: An injection molding screw for metal injection molding includes a first end, a second end, a longitudinal body with a first stage and a second stage extending axially along a length of the screw between the ends, a pressure retention device, and optionally, a screw tip. The pressure retention element minimizes loss of pressure in the second stage portion.Type: ApplicationFiled: June 13, 2003Publication date: December 16, 2004Inventors: Glenn Anderson, Jingyi Xu
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Patent number: 6824374Abstract: An injection molding machine includes a plasticating unit for plasticating a thermoplastic resin, and an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold. In the connecting passage, provided is a buffering unit for reserving the resin in an amount at least equal to the quantity of the resin injected per one shot. The plasticated resin is temporarily reserved in the buffering unit, and then, the reserved resin is fed to the injecting unit when the measuring is carried out, whereby the plasticating unit can be driven continuously simultaneously with the operation of the injecting unit and the mold. The molding cycle can shortened with the plastication efficiency being enhanced.Type: GrantFiled: December 23, 1999Date of Patent: November 30, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Kunihito Seta, Takeshi Takeda
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Publication number: 20040228944Abstract: An injection apparatus comprises a screw drive shaft, a motor which generates torque to rotate the screw, a speed reducer, and a power transmission mechanism. The power transmission mechanism has a first pulley on an output shaft of the motor, a second pulley on an input shaft of the speed reducer, and a belt passed around the first and second pulleys. The speed reducer is located between the second pulley and the screw drive shaft. The speed reducer is formed of a planetary gear mechanism, and both its input and output shafts are situated on an extension of an axis of the screw drive shaft.Type: ApplicationFiled: July 21, 2003Publication date: November 18, 2004Applicant: TOSHIBA MACHINE CO., LTD.Inventors: Toshihiro Kasai, Kazuhito Kobayashi, Junsuke Kawai
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Publication number: 20040228946Abstract: A ratio of length (L)/diameter (D) of a screw is set to 18 through 24, a length (Lf) of a supplying portion of the screw is set to 10 through 14 times the diameter (D), a groove depth (hf) of the supplying portion of the screw (14) is set to be not less than 13 mm, a groove depth (hm) of a measuring portion of the screw (14) is set to be not less than 8 mm, and a width of a molten resin path formed by a weir plate (22) and a check ring (22) in a direction orthogonal to a flow direction of the molten resin is set to be 3 through 6% of the screw diameter (D).Type: ApplicationFiled: March 29, 2004Publication date: November 18, 2004Applicants: THE JAPAN STEEL WORKS, LTD., MAZDA MOTOR CORPORATIONInventors: Kazuhisa Yokoyama, Hideaki Nakashima, Fumiaki Tsuda, Takahiro Tochioka, Mitsuharu Kaneko
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Publication number: 20040228945Abstract: An injection unit for an injection molding machine includes an injection device in the form of a plunger/screw, which is driven axially and rotationally in a housing, and a device intended for mixing and metering plastic melt and including an inlet for introduction of an additive. A spacer element is disposed between a backflow prevention assembly of the screw and the plunger, with the spacer element having a length, which corresponds at least to the stroke of the injection device. The spacer element has a first flow channel for establishing in each position a fluidic connection with a second flow channel which initially extends radially in an outward direction and then parallel to the movement and guide area of the plunger to an area between a nozzle and the plunger. The second flow channel extends through the mixing and metering device arranged adjacent to a movement and guide area of the plunger.Type: ApplicationFiled: January 28, 2004Publication date: November 18, 2004Inventor: Erich Schurmann
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Publication number: 20040213871Abstract: A hybrid injection unit for an injection molding machine includes a plasticizing screw having a shaft and constructed for rotation and axial displacement. Operatively connected to the shaft is a first electric motor for rotating the plasticizing screw, and a second electric motor for axial displacement of the plasticizing screw. A cost-efficient construction of the second electric motor and reduced stress of the linkage between this electric motor and the shaft is realized by providing at least one piston and cylinder unit in fluid communication with a pressure source for support of the second electric motor in injection direction, and a traverse acted upon by one end of the piston and cylinder unit and rotatably supporting the shaft of the plasticizing shaft. The traverse acts upon the shaft between a force introduction point of the second electric motor into the shaft, on one hand, and the plasticizing screw, on the other hand.Type: ApplicationFiled: April 15, 2004Publication date: October 28, 2004Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventors: Walter Wohlrab, Herbert Pickel
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Publication number: 20040191359Abstract: Disclosed is an injection unit having a rotatable device for preventing reverse flow. To connect first flow channels formed in a spacer and second flow channels formed in a screw head when the metering is performed, and prevent reverse flow of resin by cutting off the first flow channels and the second flow channels when the resin is injected, the injection unit has a torsion spring as spring means between a shaft of the screw head and a screw, thereby rapidly preventing movement of the melted resin by restoring force of the spring when the metering of the resin is finished.Type: ApplicationFiled: March 25, 2004Publication date: September 30, 2004Applicant: LG CABLE LTD.Inventors: Han Soo Jeon, Young Jin Park, Jin Young Kim, Dong Sung Kim, Sung Chul Shin, Kyoung Hun Han
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Patent number: 6790020Abstract: Disclosed is a system in which carbon dioxide is supplied to a pressure chamber of a molten resin preparing apparatus which has established a certain temperature environment to diffuse the carbon dioxide in a material synthetic resin in a molten state. After turning the material synthetic resin into a gas-dissolving-resin in the pressure chamber, the gas-dissolving-resin is supplied to a mold space of a molding apparatus for compression molding. The pressure inside the mold space is quickly lowered by raising an upper mold of the molding apparatus quickly, whereby a foamed article is produced from the gas-dissolving-resin in the mold space.Type: GrantFiled: December 11, 2001Date of Patent: September 14, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Takeo Kitayama, Nobuhiro Usui
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Publication number: 20040173925Abstract: The invention relates to a control method for controlling the back pressure in an injection molding machine which includes a first motor that axially displaces a screw and a second motor that turns the screw, whereby both motors act upon a common shaft. In order to control the back pressure, a speed value for controlling the second motor is furnished as a rotational speed input value to a control circuit for controlling the speed or rotation speed of the first motor. The back pressure is thus controlled in dependence on a pressure differential via the difference in rotation speeds of both motors.Type: ApplicationFiled: January 12, 2004Publication date: September 9, 2004Applicant: MANNESMANN PLASTICS MACHINERY GMBHInventor: Andreas Melkus
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Publication number: 20040161485Abstract: To simplify and downsize an apparatus by using a magnetic screw shaft and a magnetic nut member for a rotational-linear motion conversion mechanism used as an electric drive of an injection apparatus or the like.Type: ApplicationFiled: December 22, 2003Publication date: August 19, 2004Inventor: Sentaro Kobayashi
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Publication number: 20040142056Abstract: By starting injection, resin pressure in front of the check valve is raised, and the check ring moves backward. Pressure of resin accumulated between flights of the screw prevents the check ring from moving backward, and the screw is kept freely rotatable to thereby make the backward speed of the check ring faster. Therefore, the check ring is brought into tight contact with the check seat quickly to close the resin path. Thereafter, the rotation of the screw is fixed, reduced pressure in the injection/dwell causes the screw to rotate in a normal direction, and prevents the resin from being pressed toward the front of the check valve.Type: ApplicationFiled: December 23, 2003Publication date: July 22, 2004Applicant: FANUC LTD.Inventors: Hiroshi Watanabe, Shingo Komiya
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Publication number: 20040109918Abstract: The invention relates to an injector unit and a method for the control of the injection process into the cavities of injection moulding tools. The novel solution permits the injection of thin-walled injection moulding pieces (76, 77), with both electrically- and hydraulically-driven injector screws. One of the most important features thereof is the active selection of the opening time of the locking system at an optimal pressure in the compression chamber, preferably in the region of the upper half of the compression. The volumetric transfer flow is thus significantly improved in thin-walled injection moulding pieces (76, 77). Above all the melting pressure in the tool, the flow speed and the useful flow path in the cavities are increased.Type: ApplicationFiled: January 9, 2004Publication date: June 10, 2004Inventor: Andreas Lind
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Publication number: 20040096534Abstract: When a metering process is started, a screw rotates at a preset rotating speed, thereby carrying out back pressure control to keep the pressure of a resin at a preset pressure, and retreats. When the screw is located near a preset metering completion position, the control mode is switched to positioning control for the preset metering completion position, and a screw rotation stop command is outputted. The screw overruns for some distance before its rotation stops after it retreats and stops at the preset metering completion position. A resin quantity for the overrun is corrected to obtain a preset metered resin quantity by reversely rotating the screw by a rotational amount corresponding to the overrun.Type: ApplicationFiled: November 7, 2003Publication date: May 20, 2004Applicant: Fanuc Ltd.Inventors: Wataru Shiraishi, Satoshi Takatsugi, Toshio Ishikuro, Hiroyasu Asaoka
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Patent number: 6733704Abstract: An injection molding machine includes a plasticating unit for plasticating a thermoplastic resin, and an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold. The injecting unit A includes a rotary pump having a suction port connected to the plasticating unit through the connecting passage and a discharge port connected to the mold. The plasticated resin is intermittently injected into the cavity of the mold through the injection port by means of the rotary pump. In the connecting passage, an accumulator is provided which reserves the resin plasticated in the plasticating unit in an amount equal to or more than the shot capacity, and feeds the resin to the rotary pump.Type: GrantFiled: September 30, 2002Date of Patent: May 11, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Kunihito Seta, Takeshi Takeda
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Publication number: 20040081717Abstract: An injection molding machine 10 utilizes a two part mold to produce a molded part. A machine includes a clamping mechanism 20 including one or more clamping cylinders 22 for applying a mold clamping force to the two part mold, an injection mechanism 30 for plasticizing material and injecting the plasticized material into the closed mold, and a controller 50 for powering the molding machine hydraulic system 52. In one embodiment, clamping pressure is automatically increased or decreased to allow air to escape as plasticized material flows into the mold cavity. In another embodiment, the controller provides a minimum clamp pressure to maintain the plasticized material within the mold as a function of fluid injection pressure to the screw member of the injection system.Type: ApplicationFiled: October 24, 2002Publication date: April 29, 2004Inventor: Jose R. Marazita
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Publication number: 20040071810Abstract: An electromagnetic coaxial driving injection apparatus, having a linear motor for driving injection and a rotation motor for metering. The linear motor and the rotation motor of both the injection and metering motors and an injection screw are set on a common axis. A connecting device connects moving parts of the motors with the injection screw. Stationary parts of the motors are fastened on a frame and forward-backward moving unit, not moving during injection and metering. Due to the arrangement of the moving parts and the injection screw on a single axis, moving parts are lessened, and transmission losses are minimized. Since the number of structural parts is low, only the moving parts of the motors move during injection while the stationary parts thereof remain at rest, thus greatly reducing inertia.Type: ApplicationFiled: April 1, 2003Publication date: April 15, 2004Inventors: Chia-chun Hsu, Yong-chen Chung, Chia-hung Lin, Wen-hung Feng, Ming-chi Chen
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Publication number: 20040018270Abstract: An injection screw is rotationally driven by a rotating motor having a stator and a rotor and can be moved by a number of electrical linear motors, linear motor comprising a primary part, which functions as a stator, and a secondary part, which is linearly movable in the axial direction in a screw cylinder to execute the injection function. The primary parts are assembled to form a first housing-like unit and the secondary parts are assembled to form a second housing-like unit which is coupled to the screw for drive purposes. The rotating motor, fixedly connected to the screw in the axial direction, is arranged with its stator fixedly coupled in the axial direction to the secondary housing-like unit.Type: ApplicationFiled: June 3, 2003Publication date: January 29, 2004Inventors: Klaus Becker, Ralf Ingo Meyer, Robert Weinmann
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Publication number: 20030219507Abstract: An injection molding device includes a continuously operating extruder and a discontinuously operating injection unit receiving plastic material from the extruder. The extruder has an extruder barrel which includes a plasticizing zone and a discharge zone, whereby the discharge zone is configured to provide an intermediate storage space and has a cross sectional area which is greater than a cross sectional area of the plasticizing zone. In this way, the discharge zone provides a buffer volume which is filled during the injection process and then emptied again.Type: ApplicationFiled: April 14, 2003Publication date: November 27, 2003Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventors: Erwin Burkle, Hans Wobbe, Walter Wohlrab
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Publication number: 20030211190Abstract: An injection molding machine using a linear motor, has a linear motor serving as a linear drive mechanism; a temperature sensor configured to detect a temperature of a coil of said linear motor or an ambient temperature thereof; an input unit configured to input a signal of the temperature detected by said temperature sensor; a data converting unit configured to convert the detected temperature signal into temperature data; a storage unit, including a temperature data setting unit configured to preset an allowable temperature, etc.Type: ApplicationFiled: March 12, 2003Publication date: November 13, 2003Applicant: TOSHIBA KIKAI KABUSHIKI KAISHAInventors: Makoto Nishizawa, Katsuhito Ogura, Katsuyoshi Kido, Harumichi Tokuyama, Hiroyuki Onuma
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Publication number: 20030211197Abstract: In a method of making formed bodies with active ingredients, in particular for the pharmaceutical and chemical fields, active ingredients and optional additives are mixed and advanced in a screw and cylinder unit. The resultant material is then injected into a closed mold cavity of a molding tool and injection-molded in the molding tool to finished formed bodies.Type: ApplicationFiled: March 25, 2003Publication date: November 13, 2003Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventors: Erwin Burkle, Hans Wobbe
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Patent number: 6641387Abstract: The installation contains means (1) for continuous production of a paste made of a thermoplastic material, means (8) for accumulating and temporarily storing the paste thus produced and means (15) for taking the paste out of the accumulating means and storage means and introducing it into a first mould comprising thermoregulated means in the form of a syringe. The invention is characterised in that the output of the accumulating means and storage means comprises a distributor (12) that has at least two outputs (13, 14) and can be controlled in order to deliver the paste to one of the two outputs, whereby one of said outputs (13) is adapted in order to be coupled to thermoregulated means (15) in the form of a syringe and the other output (14) is adapted in order to be permanently connected to the charging orifice of a piston (17) that injects the paste at a high pressure into a second part-forming mold (17), whereby one output thereof (19) is adapted in order to be permanently coupled to the second mold.Type: GrantFiled: August 8, 2001Date of Patent: November 4, 2003Assignee: Faurecia IndustriesInventors: Michel Letroublon, Rémi Domagata, Philippe Dumazet
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Publication number: 20030185932Abstract: The invention relates to an injection screw drive for a plastic injection molding machine comprising axes (A1, A2) respectively provided for the rotative and for the axial motion of the injection screw (4). According to the invention, the injection screw drive has at least one double rack rail overdrive for effecting the axial motion. The injection worm drive is configured as a gear combination having at least two drive motors (18, 44) and an output axle. The gear combination has, as a core, a gear block with a gear casing (42), to which at least two reducing gears are connected that effect the rotative and the axial motion of the injection screw (4). This enables the entire machine to be provided with a short and compact structure insofar as this concerns the injection aggregate. According to a second embodiment, both drives have separate housings. The entire injection unit rests, in a known manner, on the machine stand (33) via guide rails (32) such that it can be displaced.Type: ApplicationFiled: May 9, 2003Publication date: October 2, 2003Inventors: Franz Chromy, Robert Weinmann, Erich Knobel
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Patent number: 6627134Abstract: An apparatus for injection molding two compatible polymeric materials, in which two substantially coaxial extrusion screws are used to plasticize the two materials into a common accumulation space. The charge comprising multiple layers of material is then injected into a closed mold by means of forward axial motion of the outer screw with respect to its enclosing barrel. Once inside the mold, the first material forms a skin layer totally or partially surrounding the other material. In this way a part having a plurality of material properties may be produced in a single operation.Type: GrantFiled: May 8, 2001Date of Patent: September 30, 2003Assignee: Community Enterprises, LLCInventor: Joel Thomson
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Publication number: 20030137073Abstract: In a method of making an electrically conductive electrode member, a compound material, containing a binder made of polymer plastic and 80 weight % of a powdery electrically conductive material as filler, is introduced into a plasticizing screw of an injection molding machine for transforming the compound material to a plasticized material and discharging the plasticized material via a nozzle having a length of less than 15 mm for subsequent injection molding. The injection molding machine is constructed throughout a material flow passage from a point of introduction of the compound material to the injection mold to have only tapered portions which narrow a flow cross section by not more than 10:1.Type: ApplicationFiled: December 2, 2002Publication date: July 24, 2003Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventor: Dietrich Hunold
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Publication number: 20030111752Abstract: A resin transfer molding (RTM) process is disclosed for rapidly filling a fibrous preform and/or a rigid, porous body with high viscosity resin or pitch. The process is suitable for impregnated multiple porous bodies stacked in a single mold. The process uses a fibrous preform or rigid porous body which is placed into a mold matching the desired part geometry. A resin is injected into the mold at temperature and pressure. After cooling, the infiltrated component is removed from the mold. The mold is constructed from two halves fitted to form at least one mold cavity. A gate fitted with a nozzle is set into one of the mold halves, and a valve admits resin or pitch into the gate area. Venting or vacuum can be applied to the mold. The mold is held in a hydraulic press and an extruder, optionally fitted with an accumulator, supplies molten resin or pitch to the mold.Type: ApplicationFiled: January 14, 2003Publication date: June 19, 2003Inventors: Michael D. Wood, Frank Dillon, Richard A. Heckelsberg, Roger W. Holloway, Mark L. LaForest, Neil Murdie, Charles A. Parker, James F. Pigford
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Publication number: 20030111756Abstract: An injection molding machine comprises a pre-pressure addition means 2 adding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screw 1 to a detection means 3 and/or the screw 1, the detection means 3 detecting the axial pressures A and B of the screw, and a screw movement control means 4 controlling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition means 2 is made non-contact with the direction means 3, a forward and backward driving motor 17 is disposed adjacent to a heating cylinder 10, and a screw connector 21 at the rear end of the screw 1 is spline-connected inside a rotating rotor of a screw rotating motor 12. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.Type: ApplicationFiled: September 30, 2002Publication date: June 19, 2003Inventors: Ryozo Morita, Satoshi Tomita, Tsuyoshi Miyaki, Keijiro Oka, Tokuzuo Sekiyama, Hiroshi Shibuya, Satoshi Nishida
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Publication number: 20030108640Abstract: An injection apparatus for industrial machine capable of high speed injection is provided with an injection barrel communicating with a cavity formed by at least a pair of mold dies and introducing mold material to an end portion on communicating side of the barrel, a screw for injection inserted in the barrel in which the screw is capable of reciprocating motion so as to inject and fill the mold material into the cavity, a support means holding an end of the screw opposite to the cavity and capable of moving in the direction of the reciprocating motion, a first drive mechanism including an electric servomotor for moving the support means in the direction of the reciprocating motion and a second drive mechanism for moving the first drive mechanism in the direction of the reciprocating motion.Type: ApplicationFiled: November 27, 2002Publication date: June 12, 2003Inventors: Makato Nishizawa, Kazuhito Kobayashi, Junsuke Kawai
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Publication number: 20030104093Abstract: An extruder screw for processing plastic material, in particular for a plasticizing barrel of an injection molding machine, has at least one screw flight divided along its length into successive zones including a mixing and transformation zone for plasticizing plastic material and a subsequent discharge zone for expelling plastic material. The screw flight is formed in the mixing and transformation zone with at least one breach to define a through passage for return of a partial mass flow to a neighboring screw turn, whereby the screw flight extends towards a discharge end of the discharge zone of the extruder screw along a helical line having same thread direction and being offset in axial direction in the area of the breach.Type: ApplicationFiled: October 28, 2002Publication date: June 5, 2003Applicant: KRAUSS-MAFFEI KUNSTSTOFFTECHNIK GMBHInventor: Martin Wurtele
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Publication number: 20030090019Abstract: An injection molding machine includes an actuator supplied oil so as to actuate, an accumulator in which the oil, supplied to the actuator and having an accumulating hydraulic pressure set in a range of designated values, is accumulated, an accumulating hydraulic pressure determining part configured to determine whether or not the accumulating hydraulic pressure is sufficiently higher than an actuating hydraulic pressure that is a hydraulic pressure for actuating the actuator, and an accumulating hydraulic pressure change part configured to reduce a set value of the accumulating hydraulic pressure in a case where the accumulating hydraulic pressure is sufficiently higher than the actuating hydraulic pressure.Type: ApplicationFiled: November 13, 2002Publication date: May 15, 2003Applicant: Sumitomo Heavy Industries, Ltd.Inventor: Mitsuaki Amano
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Publication number: 20030082267Abstract: An injection molding machine includes an injection chamber unit with a horizontal channel, a vertical channel, and a transitioning passage interconnecting the horizontal and vertical channels. The transitioning passage has an innermost turning side and an opposite outermost turning side longer than the innermost turning side. The transitioning passage includes at least two turning corners of obtuse angle at the outermost turning side and adjacent to the horizontal channel and the vertical channel, respectively. The transitioning passage further includes a tapered passage section which tapers toward the vertical channel, and a wall part which partially Ago confines the tapered passage section at the outermost turning side. The wall part has a shape conforming to a segment of a truncated cone-shaped face which extends angularly by an angle of less than 360 degrees.Type: ApplicationFiled: October 26, 2001Publication date: May 1, 2003Inventor: Hsueh-Cheng Liao