Toggle Patents (Class 425/593)
  • Patent number: 11407025
    Abstract: A casting apparatus for a cylinder block prevents deformation of a core pin and a cast passage formed by the core pin due to impact of molten metal when casting. Embodiments include a first side mold having a first core pin, a second side mold having a second core pin, a third mold having a molten metal inlet, and a metal dowel. The molten metal inlet is disposed so the inflow direction of molten metal intersects the axial direction of the first and second core pins, which are butted against each other at mold clamping and constitute a core for forming a main gallery for lubricant. The metal dowel is disposed between the molten metal inlet and a butt portion between the first and second core pins so that the butt portion is covered by the metal dowel from the upstream side in the inflow direction of the molten metal.
    Type: Grant
    Filed: September 22, 2021
    Date of Patent: August 9, 2022
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Daichi Sasaki, Masatoshi Juri
  • Patent number: 10195776
    Abstract: A toggle mold closure assembly for injection presses includes: fixed, mobile and reaction planes, mounted on columns; a control unit of the toggle, having four pairs of levers, arranged symmetrically at two sides, in upper and lower parts of the structure, interconnected by a pin and to the reaction plane and mobile plane by respective pins; and an actuation unit of the control element. The control unit is placed on the axis of the toggle in the middle of the pairs of main side levers, which have an outward movement. The control unit is connected, by control connecting rods, to the levers of the toggle connected to the reaction plane, and is placed between the central connection pin of the levers and the reaction plane. The control unit is provided with heads for connection to the connecting rods external to the reaction plane and turned towards the reaction plane.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: February 5, 2019
    Assignee: NEGRI BOSSI S.P.A.
    Inventors: Angelo Brioschi, Maurilio Meschia
  • Patent number: 10155333
    Abstract: A toggle clamp unit of a plastic processing machine, especially of an injection molding machine, including a front plate and a crosshead which is arranged movable relatively to the front plate in a direction of closing, wherein at least two levers are supported articulated at the front plate, wherein the at least two levers are each connected articulated with at least one link which links are supported articulated at the crosshead and wherein the crosshead is provided with at least one linear bearing by which the crosshead is movably supported relatively to the front plate in the direction of closing. To design the linear bearing very smooth-running and to reduce the requirement of lubrication the invention proposes that the linear bearing is designed as a roller bearing.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: December 18, 2018
    Assignee: WITTMANN BATTENFELD GMBH
    Inventors: Andreas Lechner, Juergen Pinter
  • Patent number: 9701052
    Abstract: A fixed platen of an injection molding machine is provided with a first leg protruding at a substantially central portion of a lower part and secured to a base frame and second legs protruding left and right. Each of the second legs is provided with a thin portion thinner than the fixed platen. Thus, a deformation difference between the upper and lower sides of the fixed platen caused during nozzle touch operation or when the fixed platen is subjected to a mold clamping force can be reduced.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: July 11, 2017
    Assignee: FANUC CORPORATION
    Inventor: Masatoshi Senga
  • Patent number: 9138923
    Abstract: The vertical injection molding machine is provided with an electric servomotor which moves an injection drive unit up and down accompanying the rotation of a driven pulley via a ball screw mechanism, a timing belt by which the drive force of the electric servomotor is transmitted, and a driven pulley on which the timing belt is rotated, wherein an arc groove is formed on the driven pulley, and an election pin is provided which is inserted to the arc groove of the driven pulley when the timing belt is disconnected. When the election pin is inserted to the arc groove, the tip of the election pin applies pressure on an inclined portion by means of elastic force of a spring, slowing the rotational speed of the driven pulley and stopping the injection drive unit by an inner wall surface of the slowed driven pulley colliding with the ejection pin.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: September 22, 2015
    Assignee: TOYO MACHINERY & METAL CO., LTD.
    Inventors: Hiromichi Kuroda, Akihiro Kuroda
  • Patent number: 9011130
    Abstract: A toggle clamping mechanism for an injection molding machine includes a toggle link, a crosshead connected to the toggle link, and a driving device for driving the crosshead. A ball spline shaft is provided parallel to a ball screw for driving the crosshead. Further, a ball spline nut provided in the crosshead is engaged with the ball spline shaft so that the crosshead may be guided by the ball spline shaft.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: April 21, 2015
    Assignee: Fanuc Corporation
    Inventor: Masatoshi Senga
  • Publication number: 20150099031
    Abstract: An adjustment mechanism for a movable platen of an injection molding machine is provided with a push bolt, configured to apply a force to push up the movable platen against a gravitational force, and a pull bolt, configured to apply a force to draw in the movable platen in the direction of gravity. The movable platen is adjusted by regulating its height above a base of the molding machine in a plurality of positions at different distances from a fixed platen.
    Type: Application
    Filed: October 3, 2014
    Publication date: April 9, 2015
    Inventor: Shingo OKADA
  • Publication number: 20140295020
    Abstract: A toggle clamping mechanism for an injection molding machine includes a toggle link, a crosshead connected to the toggle link, and a driving device for driving the crosshead. A ball spline shaft is provided parallel to a ball screw for driving the crosshead. Further, a ball spline nut provided in the crosshead is engaged with the ball spline shaft so that the crosshead may be guided by the ball spline shaft.
    Type: Application
    Filed: March 25, 2014
    Publication date: October 2, 2014
    Applicant: FANUC CORPORATION
    Inventor: Masatoshi SENGA
  • Patent number: 8821152
    Abstract: An injection-molding machine for processing plastics has, on a mold-closing unit (F), at least one injection mold (10) which can be accommodated between a stationary mold carrier (12) and a movable mold carrier (11). The mold carriers are moved by means of at least one pair of toggle levers with two toggle lever mechanisms (K), which are driven in a closing direction (s-s) independently of one another each by a drive unit (A), wherein the toggle lever mechanisms (K) are mounted on a bearing plate (14). Since the bearing plate (14) is mounted on the injection-molding machine such that it can move along guides (28), and the drive units (A) are mounted on the movable bearing plate (14) on which the actuating elements for the at least two toggle lever mechanisms (K) are mounted, it is possible to influence the parallelism of the mold carriers both in the static and in the dynamic state.
    Type: Grant
    Filed: October 16, 2011
    Date of Patent: September 2, 2014
    Assignee: Arburg GmbH + Co. KG
    Inventor: Renate Keinath
  • Patent number: 8814559
    Abstract: Disclosed herein is a five-joint clamping apparatus for an injection molding machine. The clamping apparatus according to the present invention keeps advantages of a conventional five-joint clamping apparatus, specifically, high mold opening or closing speed and control precision, has an increased stroke distance in link mechanism, and has a structure capable of pressing a central portion of a mold.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: August 26, 2014
    Assignee: Woojin Plaimm Co., Ltd
    Inventors: Yun Son Jon, Kyeong Ha Park, Young Shin Kim, Seung Ho Cho
  • Patent number: 8715548
    Abstract: A mold fastening device has a fixed die plate, a rear plate, a movable die plate that can move back and forth, a toggle mechanism, and a drive motor that drives a cross-head. The position where the cross-head should be stopped is associated with the rate at which to accelerate the cross-head from that position or the rate at which to decelerate the cross-head to that position. The cross-head is operated at an acceleration that corresponds to that position. The drive motor is thereby driven at a constant output torque, regardless of the position of the movable die plate. Further, the time for opening and closing metal molds can be shortened.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: May 6, 2014
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Hideaki Tobita, Harumichi Tokuyama
  • Publication number: 20140113023
    Abstract: Disclosed herein is a five-joint clamping apparatus for an injection molding machine. The clamping apparatus according to the present invention keeps advantages of a conventional five-joint clamping apparatus, specifically, high mold opening or closing speed and control precision, has an increased stroke distance in link mechanism, and has a structure capable of pressing a central portion of a mold.
    Type: Application
    Filed: July 11, 2013
    Publication date: April 24, 2014
    Inventors: Yun Son Jon, Kyeong Ha Park, Young Shin Kim, Seung Ho Cho
  • Patent number: 8585395
    Abstract: In a toggle type mold clamping device including a plurality of link units, a coupling portion of a first link coupled with a toggle driving link is provided on an outer side of an area between a coupling portion of the toggle driving link coupled with a crosshead and a center line of the first link. Furthermore, the first link has a structure in which two members arranged in parallel are coupled and integrated with each other and a space through which the toggle driving link passes is formed between the two coupled members.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: November 19, 2013
    Assignee: FANUC Corporation
    Inventors: Masatoshi Senga, Koichi Nishimura
  • Publication number: 20130259972
    Abstract: In a mold clamping mechanism for an injection molding machine, a mold platen stiffness adjusting plate is attached to a mold platen (a movable platen, a fixed platen) at the mold attachment surface thereof. The mold platen stiffness adjusting plate is provided, at the mold attachment surface thereof, with elements for mold attachment that have the same shapes and are arranged on the same places as those provided on the mold platen at the mold attachment surface thereof. Accordingly, the same mold can be attached to the mold platen stiffness adjusting plate attached to the mold platen, and can also be attached to the mold platen from which the mold platen stiffness adjusting plate is detached.
    Type: Application
    Filed: February 28, 2013
    Publication date: October 3, 2013
    Applicant: FANUC CORPORATION
    Inventors: Satoshi TAKATSUGI, Koichi NISHIMURA, Masatoshi SENGA
  • Publication number: 20130224329
    Abstract: An injection-moulding machine for processing plastics has, on a mould-closing unit (F), at least one injection mould (10) which can be accommodated between a stationary mould carrier (12) and a movable mould carrier (11). The mould carriers are moved by means of at least one pair of toggle levers with two toggle lever mechanisms (K), which are driven in a closing direction (s-s) independently of one another each by a drive unit (A), wherein the toggle lever mechanisms (K) are mounted on a bearing plate (14). Since the bearing plate (14) is mounted on the injection-moulding machine such that it can move along guides (28), and the drive units (A) are mounted on the movable bearing plate (14) on which the actuating elements for the at least two toggle lever mechanisms (K) are mounted, it is possible to influence the parallelism of the mould carriers both in the static and in the dynamic state.
    Type: Application
    Filed: October 16, 2011
    Publication date: August 29, 2013
    Applicant: ARBURG GMBH + CO. KG
    Inventor: Renate Keinath
  • Patent number: 8414287
    Abstract: The present invention relates to a clamping unit for an injection molding machine, comprising a displaceable clamping plate (2), a support plate (3) and a drive device acting between the displaceable clamping plate (2) and the support plate (3), which has at least one electric motor (21, 121) and at least one connecting rod (10-13; 110-113), wherein the electric motor (21, 121) directly or indirectly acts on the connecting rod or connecting rods (10-13; 110-113) for opening, closing and/or applying the clamping force. According to the invention, it is proposed to provide in addition to the electric motor (21, 121) at least one separate hydraulic drive (116, 116?, 116?), which is joined by a hinge separately to a connecting rod and acts in parallel to and independently of the electric motor at least at times for opening, closing and/or applying the clamping force.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: April 9, 2013
    Assignee: KraussMaffei Technologies GmbH
    Inventor: Walter Wohlrab
  • Patent number: 8246336
    Abstract: An injection molding machine includes a hydraulic driving system providing hydraulic power; a molding system configured for molding a workpiece; and an injection system configured for injecting a molten material to the molding system with the hydraulic power. The injection system includes a cylinder and a piston movably received in the cylinder. The cylinder is surrounded by one of an alternating current-charged coil of wire and a closed-loop coil of wire, and the piston is surrounded by the other, whereby the piston receives acceleration for movement in the cylinder.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: August 21, 2012
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Hsiang-Hung Chen
  • Patent number: 8221107
    Abstract: The invention relates to a mold clamping unit on a plastic injection molding machine, the unit having a clamping mechanism for opening and closing an injection mold, the mechanism having a servo motor as the drive motor (21). The drive motor drives at least one spindle drive (10) which has a spindle nut (12) and spindle which work together on a bearing position (14). A cooling system with cooling channels (25) is provided for removing heat from the clamping mechanism. A more efficient cooling of the spindle drive is achieved in that the cooling channels (25) penetrate the bearing position (14) of the spindle drive (10) and/or one of the cooling plates (23) assigned to the bearing position.
    Type: Grant
    Filed: October 5, 2009
    Date of Patent: July 17, 2012
    Inventors: Karl Hehl, Renate Keinath, legal representative
  • Patent number: 8097192
    Abstract: A die opening and closing device for a movable die plate and a fixed die plate includes a toggle link disposed between the movable die plate and a die tightening housing, a cross head for flexing the toggle link, and a motor-driven ball screw penetrating through the die tightening housing and inserted into the cross head, and this die opening and closing device is provided with die thickness adjusting means for adjusting the die thickness S when the die is tightened by extension of the toggle link, and ball screw rotation control means for controlling constant the cracking gap, and a foamed resin molding machine is presented, together with its operating method.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: January 17, 2012
    Assignee: Daisen Industry Co., Ltd.
    Inventors: Akihiko Tsuda, Tomio Nakashima, Tomohiro Oshima, Taizo Mio
  • Publication number: 20110287130
    Abstract: A multi-rod structure for opening and closing molds is provided and includes a single cam, a first side connection rod assembly located on a first side of the cam and having a first side triple connection rod, a first mold actuated by the first side triple connection rod, a linkage connection rod, a second side connection rod assembly located on a second side of the cam and having a second side triple connection rod actuated by the linkage connection rod, and a second mold actuated by the second side triple connection rod. The multi-rod structure only uses the single cam to simultaneously actuate the first and second molds, so that the structure can be simplified, while the vibration, loading, noise and abrasion of components during operation can be relatively reduced.
    Type: Application
    Filed: February 3, 2011
    Publication date: November 24, 2011
    Applicant: National Sun Yat-Sen University
    Inventors: Der-min Tsay, Hsin-pao Chen, Shih-han Chen
  • Patent number: 8029270
    Abstract: The invention relates to a method and a device for blow-moulding containers from preforms which have been previously heated in a heating section and consist of a thermoplastic material. After being heated, said preforms are transferred to a blowing device in which they are deformed in order to form containers under the action of a blowing pressure inside blow moulds. The blow moulds respectively consist of at least two blow-moulding segments. The preforms are transported together with the blow moulds at least along part of a path of a rotating blow wheel. The blow-moulding segments are braced in relation to each other during at least part of the blow-moulding process. At least one of the blow-moulding segments is pivoted about a rotational axis in order to perform opening and closing movements.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: October 4, 2011
    Assignee: KHS Corpoplast GmbH & Co. KG
    Inventors: Rolf Baumgarte, Michael Litzenberg, Michael Linke
  • Patent number: 7866976
    Abstract: Mold clamping mechanism of an injection molding machine with a movable platen (10), a fixed platen (12) and a support section (9) connected to the movable platen (10) through connecting links, wherein, when clamping force is applied via the connecting links, a force is transmitted to the front face (9A) of the support section (9), wherein at least one recess (25) is arranged between the front face (9A) and the back face (9B) of the support section (9), which is formed in such a manner that those regions of the front face (9A) of the support section (9) to which the force (FH) is transferred are evenly deformed when force is applied.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: January 11, 2011
    Assignee: Engel Austria GmbH
    Inventors: Michael Bauer, Thomas Eizenberger
  • Patent number: 7854606
    Abstract: The invention relates to an injection molding machine comprising a machine frame (10), an injection molding unit (S, S?) and a mold closing unit (F). Said mold closing unit (F) is provided with a stationary element and a movable mold support (12) which are fixed thereto, wherein said movable mold support (12) is mounted in front of the stationary element and is displaceable on a guiding elements (11) in the direction of closing (s-s) in and out of a positive locking, wherein the mold closing unit (f) is provided with, fixed thereto, the machine frame (10) or at least a part thereof in the form of a stationary mold carrier (13) and the movable mold support (12) displaceable with respect to said stationary mold carrier (13) on the guiding elements (11). The other parts of the mold closing unit (F) is movable in a positive locking with respect to the stationary mold carrier (13).
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: December 21, 2010
    Inventor: Karl Hehl
  • Patent number: 7607912
    Abstract: A mould holding cross member (9) according to the invention comprises a support base (91) a suitable to compress the mould (S) and more projecting, in the mould closing direction, than the ends (90) with which the cross member is connected to the moving columns (6) of the press on which it is fitted. The base (91) is connected to the rest of the cross member by a narrow portion (99) which extends in the central area of the base and between the projections of the hinging areas (7, 8) of the double toggle of the press on the press bed (2), and substantially not outside those projections. In this way the pressures are more uniformly distributed on the mould (S). The present invention also concerns a press fitted with a cross member (9) as defined above.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: October 27, 2009
    Assignee: S.I.P.A. Societa' Industrializzazione Progettazione E. Automatzione S.p.A.
    Inventors: Fabio Tognon, Davide Colla, Matteo Zoppas
  • Patent number: 7491050
    Abstract: A mold clamping unit includes a mold height adjustment system having a length-adjustable threaded connection, comprised of a threaded spindle and a spindle nut which supports a platen of a molding tool, for stroke transmission and transmitting a locking force in clamping position. A clamping mechanism, which locks the spindle nut in relation to the threaded spindle and is selectively releasable for length adjustment of the threaded connection, includes a clamping nut, connected in fixed rotative engagement with and coupled for slight axial displacement in relation to the spindle nut, and an actuator, switchable between an active position, in which the spindle nut is braced with the clamping nut by a tightening force so that the platen is urged against the spindle nut, and an idle position, in which the actuator is released and which can be implemented irrespective of a stroke position of the drive mechanism.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: February 17, 2009
    Assignee: Demag Ergotech Gmbh
    Inventors: Kurt Dieno, Andreas K├╝bel
  • Publication number: 20080164636
    Abstract: The present invention provides a vertical molding machine whose mechanisms can be simplified and whose cost can be lowered. The vertical molding machine includes a frame; an upper platen (31) fixed to the frame and having an upper mold (41) mounted thereon; a connection member disposed in such a manner as to extend downward from the upper platen (31); a lower base member held by the connection member under the upper platen (31); a lower platen (35) disposed in a manner capable of advancing and retreating along the connection member and having a lower mold mounted thereon; and a mold-clamping drive section which advances and retreats the lower platen (35) so as to bring the lower mold in contact with the upper mold (41) or move the lower mold away from the upper mold (41) for effecting mold closing, mold clamping, and mold opening. The lower base member is moved downward by a mold-clamping force generated by the drive section at the time of mold clamping.
    Type: Application
    Filed: March 23, 2006
    Publication date: July 10, 2008
    Inventor: Tatsuhiko Shimokawa
  • Publication number: 20080150190
    Abstract: An object is to provide a molding method and a molding machine which can reduce load acting on a drive section for mold clamping, as well as a molded product produced by the molding method or the molding machine. The method includes the steps (the molding machine includes means) for charging a molding material into a cavity a plurality of times; performing mold clamping each time the molding material is charged; and retreating, at a predetermined timing, a base plate by a predetermined mold thickness adjustment amount so as to adjust the origin position of a toggle mechanism. In this case, a molding material is charged into the cavity a plurality of times; mold clamping is performed each time the molding material is charged; and at a predetermined timing, the base plate is retreated by a predetermined mold thickness adjustment amount whereby the origin position of the toggle mechanism is adjusted. Since the compressing force increases, the load acting on a drive section for mold clamping can be reduced.
    Type: Application
    Filed: December 22, 2005
    Publication date: June 26, 2008
    Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.
    Inventor: Naoki Takigawa
  • Publication number: 20080131551
    Abstract: An injection stretch blow molding apparatus includes a lower base which is secured on a stage, an upper base which is disposed above the lower base and supports a turntable, and vertical clamping device that raises and lowers the upper base with respect to the lower base. The vertical clamping device includes a pulling plate disposed in the stage under the lower base, a plurality of tie rods which pass through the lower base and connect the upper base and the pulling plate, a vertical clamping toggle mechanism which is disposed in the stage at a position under the injection molding section and expands and contracts with respect to the lower base as a reference position to raise and lower the pulling plate, and a first motor which transmits a driving force to the vertical clamping toggle mechanism.
    Type: Application
    Filed: January 30, 2008
    Publication date: June 5, 2008
    Applicant: Nissei ASB Machine Co., Ltd.
    Inventor: Hisakazu Hirata
  • Patent number: 7381043
    Abstract: An apparatus for regulating an injection moulding machine comprising a crank lever mechanism for moving the movable mould mounting plate, wherein the crosshead of the crank lever mechanism is driven by a drive device.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: June 3, 2008
    Assignee: Engel Austria GmbH
    Inventor: Stefan Engleder
  • Patent number: 7351049
    Abstract: A toggle mechanism of an injection molding machine consists of upper and lower toggle assemblies, which are pivoted to a fixed tail support at a first end, and a movable mold support of an injection molding machine at a second end; each of the toggle assemblies has two toggles pivoted together, each of which has pivotal holes on two ends; pivotal rods are passed through corresponding pivotal holes of the toggles to pivot the toggles together; pivotal rods are used to pivot the toggle assemblies to the fixed tail support and the movable mold support; each pivotal rod has oil holes in radial and axial directions; the oil holes communicate with the pivotal holes of the toggles, and each toggle has an internal oil passage communicating with its pivotal holes; lubricating oil will circulate in the toggle mechanism after conduits and filtering barrels are connected to the pivotal rods.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: April 1, 2008
    Assignee: Hwa Chin Machinery Factory Co., Ltd.
    Inventor: Jui-Hsiang Wang
  • Publication number: 20080063744
    Abstract: A toggle mechanism of an injection molding machine consists of upper and lower toggle assemblies, which are pivoted to a fixed tail support at a first end, and a movable mold support of an injection molding machine at a second end; each of the toggle assemblies has two toggles pivoted together, each of which has pivotal holes on two ends; pivotal rods are passed through corresponding pivotal holes of the toggles to pivot the toggles together; pivotal rods are used to pivot the toggle assemblies to the fixed tail support and the movable mold support; each pivotal rod has oil holes in radial and axial directions; the oil holes communicate with the pivotal holes of the toggles, and each toggle has an internal oil passage communicating with its pivotal holes; lubricating oil will circulate in the toggle mechanism after conduits and filtering barrels are connected to the pivotal rods.
    Type: Application
    Filed: September 8, 2006
    Publication date: March 13, 2008
    Inventor: Jui-Hsiang Wang
  • Patent number: 7244378
    Abstract: A clamping apparatus is operable in a closure position detection mode for detecting closure of a mold on the basis of a change in a physical quantity because of closure of the mold, detecting a position of a crosshead of a toggle mechanism at the time of detection of the closure, and obtaining a closure position of a movable platen at the time of the closure from the detected position of the crosshead. The apparatus is previously operated in the closure position detection mode to store, as a reference value, the closure position at which a target mold clamping force is obtained. In the production operation, the apparatus is operated in the closure position detection mode to obtain an actual closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: July 17, 2007
    Assignee: Nissei Plastic Industrial Co., Ltd.
    Inventors: Okada Haruo, Miyajima Masahiko, Hakoda Takashi
  • Patent number: 7244379
    Abstract: In a mold protection method for a mold clamping apparatus, a predetermined mold protection zone is set in a zone in which a mold is closed, and an anomaly such as presence of a foreign object is detected on the basis of a change in a physical quantity in the mold protection zone so as to protect the mold. The method includes the steps of previously setting, as a reference position, a closed position of a movable platen at which a target mold clamping force is obtained; setting an end position of the mold protection zone with respect to the reference position; obtaining, during a production operation, an actual closed position (detected position) of the movable platen; and correcting the end position of the mold protection zone on the basis of a deviation between the detected position and the reference position.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: July 17, 2007
    Assignee: Nissei Plastic Industrial Co., Ltd.
    Inventors: Takashi Hakoda, Masahiko Miyajima
  • Patent number: 7223084
    Abstract: The purpose of the invention is to prevent a sticking of lubricant to a ball screw shaft and a scattering to the circumstance in an electromotive toggle mold clamping device. This invention relates to the electric motor driven toggle mold clamping device wherein a ball nut member is screwed together to the ball screw shaft which rotates by an electric motor to advance and retreat freely and a cross head is fixed to the ball nut member, a cylindrical or polygonal cylindrical member which has a cylindrical body shape or square cylindrical body shape with a length and a size of placing the ball screw shaft with a required gap while retreating the cross head, is attached to the front ends of the cross head concentrically with the ball screw shaft. The ball screw shaft protruding from the cross head is placed in the cylindrical or polygonal cylindrical member having a required gap.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: May 29, 2007
    Assignee: Nissei Plastic Industrial Co., Ltd.
    Inventors: Fumio Shiozawa, Keizou Shimizu
  • Patent number: 7214050
    Abstract: An adjusting seat of an injection molding machine has a split-flow hydraulic pump secured thereon; the split-flow hydraulic pump is equipped with several oil input/output conduit sets; several hydraulic motors are secured on the adjusting seat and connected to respective ones of the oil input/output conduit sets of the split-flow hydraulic pump; each of the hydraulic motors has a toothed disk on an output portion thereof; the injection molding machine further has several gears, which are positioned around tie rods of the molding machine, and engage the toothed disks respectively; each of the toothed disks has a sub gear joined thereto while a chain is positioned over and engaged with the sub gears.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: May 8, 2007
    Assignee: Hwa Chin Machinery Factory Co., Ltd.
    Inventor: Jui-Hsiang Wang
  • Patent number: 7210918
    Abstract: A rear platen is moved forward toward a fixed platen as much as the amount corresponding to a mold clamping force which is set in advance, in a state in which the toggle mechanism of a toggle type mold clamping system is contracted, to detect that a fixed mold half attached to the rear platen touches a movable mold half attached to the fixed platen. When mold touch is detected, the rear platen is moved backward as much as the amount of stretch of a tie bar which is generated from the mold touch.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: May 1, 2007
    Assignee: Fanuc Ltd
    Inventors: Hiroshi Watanabe, Masatoshi Senga
  • Patent number: 7182590
    Abstract: A toggle type mold clamping mechanism for preventing the degradation of parallelism between stationary and movable platens, which is caused due to a clearance between a pin and a bushing, with use of a simple construction. A mold clamping force acting on the pin is transmitted through the bushing to a link L1, thereby moving the movable platen to perform mold clamping. A pre-pressure exerting in the same direction as the direction of a mold clamping force generated at the time of mold clamping is applied by a spring or the like to move the pin toward the link L1. Even a mold opening force is exerted at the time of mold opening, the pre-pressure c provided by the spring or the like keeps the position of the clearance ? between the pin and the bushing unchanged. Since the link L1 pulled by the spring or the like is moved to follow the pin (so that the pin is not moved alone by an amount of clearance ?), the parallelism between the stationary and movable platen is not degraded.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: February 27, 2007
    Assignee: Fanuc Ltd
    Inventors: Koichi Nishimura, Naruhiro Nishimura
  • Patent number: 7179075
    Abstract: A vertical injection molding machine designed to move up/down a large weight by a toggle link mechanism so as to perform mold opening/closing. In a foreign matter detection region where a mold opening/closing servo-motor is subjected to speed feedback control during a mold closing process, a measured torque value of the mold opening/closing servo-motor is compared with a standard torque characteristic curve with no foreign matter between dies. Between a start position of the foreign matter detection region and a position of the foreign matter detection region in which a torque value is zero in the standard torque characteristic curve, it is concluded that there is a foreign matter between the dies when the measured torque is lower than the standard torque characteristic curve by a predetermined value or more.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: February 20, 2007
    Assignee: Toyo Machinery & Metal Co., Ltd.
    Inventor: Hiromasa Yamasaki
  • Patent number: 7150619
    Abstract: A crosshead position Cf for obtaining a set mold clamping force is obtained based on a mold touch position Ct obtained in mold clamping process in immediately preceding molding cycle, and a crosshead is allowed to move to the position Cf. During that time, it is determined whether a load La of a servomotor for mold clamping operation which drives a toggle mechanism exceeds a judgment load Ls, and a crosshead position Ca when the load La exceeds the judgment load Ls is stored as a mold touch position. In the next molding cycle, a crosshead position Cf where the set mold clamping force is obtained is obtained based on this stored mold touch position.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: December 19, 2006
    Assignee: Fanuc Ltd
    Inventors: Tatsuhiro Uchiyama, Hiroshi Watanabe
  • Patent number: 7134863
    Abstract: Jack-up bolts are provided at two places along the rear platen movement direction on both sides of a lower part of a rear platen of an injection molding machine. The jack-up bolt engages threadedly with a bolt hole formed in the rear platen, and a lower end face of the jack-up bolt abuts on the upper surface of a slide plate to support the rear platen. A fixing bolt is inserted in a through hole formed in the jack-up bolt, and is threadedly engaged with a tap hole provided in the slide plate, by which the rear platen and the slide plate are integrated. The rear platen moves while being supported by the slide plate. When the tilt of the rear platen is corrected, the fixing bolt is loosened and the jack-up bolt is turned, by which a distance between the rear platen and the slide plate is adjusted.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: November 14, 2006
    Assignee: Fanuc Ltd
    Inventors: Katsuyuki Yamanaka, Koichi Nishimura, Shingo Okada, Naruhiro Nishimura
  • Patent number: 7132068
    Abstract: In a mold closure position detection method, a mold closure position is detected on the basis of a variation in a physical quantity because of closure of a mold. The method comprises detecting an amount of movement of a movable platen, or a crosshead in the case where the mold clamping apparatus is of a toggle type, during closure of the mold; detecting a variation in the physical quantity because of closure of the mold; obtaining a rate of variation (which encompasses an amount of variation) in the physical quantity to a predetermined amount of movement of the movable platen or the crosshead; and detecting, as a mold closure position, a position of the movable platen or the crosshead when the variation rate reaches a preset ratio.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: November 7, 2006
    Assignee: Nissei Plastic Industrial Co., Ltd.
    Inventors: Takashi Hakoda, Toshimi Kato
  • Patent number: 7132069
    Abstract: A closure position detection mode is provided so as to obtain a rate of variation (which encompasses an amount of variation) in a physical quantity to a predetermined amount of movement of a movable platen or a crosshead, and detect, as a mold closure position, a position when the variation rate reaches a preset ratio. The mold clamping apparatus is previously operated in the closure position detection mode so as to store, as a reference value, the mold closure position at which a target mold clamping force is obtained. In production operation, the mold clamping apparatus is operated in the closure position detection mode so as to obtain an actual mold closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: November 7, 2006
    Assignee: Nissei Plastic Industrial Co., Ltd.
    Inventors: Takashi Hakoda, Toshimi Kato
  • Patent number: 7048535
    Abstract: A molding machine includes a movable mold support apparatus, the movable mold support apparatus including a mold mounting plate, a first load receiving part and a second load receiving part, and a load transmit member having a first end connected to both the first load and the second load receiving parts and a second end connected to a rear surface of the mold mounting plate, wherein a distance between the center of the mold mounting plate and the second end of the load transmit member is shorter than a distance between the center of the mold mounting plate and the first load receiving part and the second load receiving part.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: May 23, 2006
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventor: Ryuichi Takanohashi
  • Patent number: 6948925
    Abstract: The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) which is connected to a moving platen (12) by means of a toggle mechanism (13). A hollow-shaft motor (7) is provided to cooperate with a spindle (21) for operating the toggle mechanism, wherein the hollow-shaft motor (7) is connected to the toggle mechanism (13). According to the invention, the spindle (21) is arranged in a rotationally fixed manner, the end of the spindle (21), facing the moving platen (12), is in engagement with the rotor (6) of the hollow-shaft motor (7), and the stator (4) of the hollow-shaft motor is connected with the toggle mechanism (13). Preferably, a spindle nut is fixed in the rotor (6) for engagement with the spindle (21), preferably in the form of a recirculating ball screw.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: September 27, 2005
    Assignee: Mannesmann Plastics Machinery GmbH
    Inventor: Gunther Fischbach
  • Patent number: 6939124
    Abstract: The closing unit of a three-plate injection-molding machine comprises a die plate (1), a movable mold-clamping plate (2) and an end plate (3). Therein the die plate (1) and the end plate (3) are connected to one another via tie bars (4) on which the movable mold-clamping plate (2) is displaceably guided, and a toggle-lever arrangement (5), on which a drive unit (6) acts is provided between the end plate (3) and the movable mold-clamping plate (2). An encasing element (13) of variable length extends between the end plate (3) and the movable mold-clamping plate (2).
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: September 6, 2005
    Assignee: Ferromatik Milacron Maschinenbau GmbH
    Inventors: Michael Koch, Kai Grundmann
  • Patent number: 6916169
    Abstract: A drive apparatus for an injection molding machine comprises a drive means, a rotation transmission shaft, a screw shaft, a nut and a driven member. The rotation transmission shaft is connected to the drive means and rotated by the drive means. The screw shaft is rectilinearly movably disposed, surrounds the rotation transmission shaft, and engages with an outer cylindrical surface of the rotation transmission shaft on an inner cylindrical surface of the screw shaft. The nut is threadably engaged with the screw shaft. The driven member is disposed on the screw shaft. In this apparatus, the rotation generated by the drive means is transmitted to the screw shaft and the screw shaft is advanced and retracted not to rotate the nut. Therefore, the inertia of the drive apparatus becomes small and the response of mold opening/closing becomes rapid when the drive mean is driven.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: July 12, 2005
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventor: Norihito Okada
  • Publication number: 20040265418
    Abstract: The purpose of the invention is to prevent a sticking of lubricant to a ball screw shaft and a scattering to the circumstance in an electromotive toggle mold clamping device. This invention relates to the electric motor driven toggle mold clamping device wherein a ball nut member is screwed together to the ball screw shaft which rotates by an electric motor to advance and retreat freely and a cross head is fixed to the ball nut member, a cylindrical or polygonal cylindrical member which has a cylindrical body shape or square cylindrical body shape with a length and a size of placing the ball screw shaft with a required gap while retreating the cross head, is attached to the front ends of the cross head concentrically with the ball screw shaft. The ball screw shaft protruding from the cross head is placed in the cylindrical or polygonal cylindrical member having a required gap.
    Type: Application
    Filed: June 28, 2004
    Publication date: December 30, 2004
    Inventors: Fumio Shiozawa, Keizou Shimizu
  • Publication number: 20040265410
    Abstract: A sealing device (12) is provided for the cyclical opening and closing of the injection mould (M) and for applying the sealing force on a mould sealing unit on an injection moulding machine for the working of plastics. The sealing device is supported on a support. A high resolution surface deflection sensor (13) is provided as sensor means for recording the tool securing force and the sealing force, which is arranged on the support for the sealing device (12). A simple, economic and reliable measuring system is thus achieved, which can record the forces throughout the whole cycle.
    Type: Application
    Filed: April 13, 2004
    Publication date: December 30, 2004
    Inventor: Karl Hehl
  • Patent number: 6835061
    Abstract: A device for carrying out a two-stage, linear movement as well as an associated method for displacing a displaceable structural unit relative to a stationary structural unit. A first drive unit drives a shaft, which is in operative connection with a tube, which is connected to the displaceable structural unit. If a predeterminable condition is substantially achieved, a switch is made from the first drive unit to a second drive unit.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: December 28, 2004
    Inventor: Karl Hehl
  • Patent number: 6830446
    Abstract: A clamping apparatus includes upper and lower platens; one or more tiebars connecting the platens; and an intermediate platen between the upper and lower platens for movement relative to and along the tiebars. Upper and lower mold halves are provided on the upper and intermediate platens, respectively. A linkage connects the lower and intermediate platens. The linkage includes upper and lower links connected with each other for rotation on an intermediate shaft. The upper and lower links are pivotably supported on first and second shafts fixed to the intermediate and lower platens, repectively. The intermediate shaft is operatively connected with a drive mechanism so that the drive mechanism transmits a driving force to the linkage, and the lower platen is moved relative to the intermediate platen. A set of a radical needle bearing and a thrust bearing is used for at least one of the intermediate, first, and second shafts.
    Type: Grant
    Filed: October 4, 2002
    Date of Patent: December 14, 2004
    Assignees: Mitsubishi Electric Engineering Company Limited, Renesas Technology Corp.
    Inventors: Hiroyoshi Harada, Itaru Matsuo, Takehiko Ikegami, Hiromichi Yamada, Jyunji Sakakibara, Hiroaki Tanoue