With Plunger Return Cushioning Patents (Class 100/259)
  • Patent number: 10391731
    Abstract: A press machine includes a memory storing a plurality of function programs for changing a mode of pressing; a connection unit including a plurality of connection terminals; and a controller configured to execute at least one function program among the plurality of function programs stored in the memory, in accordance with a combination of the plurality of connection terminals of the connection unit which are each in one of a conductive state and a non-conductive state.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: August 27, 2019
    Assignee: KOMATSU INDUSTRIES CORPORATION
    Inventors: Shuhei Yamashita, Hisanori Takeuchi
  • Patent number: 9770879
    Abstract: A press drive for a press includes an elbow lever drive. The elbow lever drive includes a first lever, a second lever and a connecting rod. The lengths of the two levers as well as the connecting rod are fixed. The first lever is pivotally supported on the press frame by a first support bearing. The second lever is supported on the plunger via a second support bearing. The connecting rod and the two levers are supported by an elbow joint so as to be pivotable relative to each other about a common pivot axis. The connecting rod is driven by an eccentric drive. An adjustment arrangement is provided for moving the eccentric drive relative to the press frame or respectively, the first support bearing. In this way, different operating modes can be established depending on the position of the eccentric drive along the adjustment path.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 26, 2017
    Assignee: SCHULER PRESSEN GMBH
    Inventor: Marcus Kosse
  • Patent number: 9475206
    Abstract: A craft punch with a replaceable cutting tool includes a main body having an upper part and a lower part which are spaced up and down. The upper part has a passage, and the lower part has a receiving part to movably receive a lower cutting mold holder. An upper cutting mold holder receiving component could be installed in the passage movably up and down, the upper side of the receiving component bulges to form a tubular part, and one side of the receiving component back to the tubular part is provided with a receiving part which could movably receive an upper cutting mold; a cover plate covers the upper end of the passage and is provided with a through hole allowing the tubular part to pass through an upper bulge, and an upper cover covers the upper side of the cover plate, and is connected with the tubular part.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: October 25, 2016
    Inventor: Lijuan Huang
  • Patent number: 9433990
    Abstract: A cushion pin device for a press having a cushion pad in which a blank holder is seated on the top thereof outside a lower mold, and locks a blank holder to an upper mold while pressurizing an edge of a molded panel, includes: a cushion support disposed below the cushion pad, a cushion cylinder connected with a lower part of the cushion pad to move up or down the cushion pad from the cushion support, a linear scale mounted between the cushion pad and the cushion support to measure the position of the cushion pad, a main pressure control unit that keeps internal pressure of each cushion cylinder similarly, and a sub pressure control unit that is interconnected with the main pressure control unit so as to control the locking position of the cushion pad when each cushion cylinder operates.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: September 6, 2016
    Assignee: HYUNDAI MOTOR COMPANY
    Inventor: Ju Young Kim
  • Publication number: 20140137755
    Abstract: A method and a press are proposed for an energy-efficient drive of a press (1) with a bottom drive, in which a drive device (2) disposed in a bottom section (3), a plunger (1.1) executing a stroke (H) and receiving an upper tool part (1.2) with at least one acting tie rod (2.1.2) of a drive train (2.1) are provided and the upper tool part (2.1) corresponding to a bottom tool part (3.2) disposed in the bottom section (3) machines or forms a work piece (5). The drive device (2) is operated by at least one motor (2.1.1) and by way of a control and regulation device (4) connecting the motor (2.1.1) and the drive train (2.1). Each drive train (2.1) can be operated by its own motor (2.1.1). When using a drawing device with a holder (3.3.1), it is operated in the change and during at least a partial path of the respective stroke (H) by the drive train (2.1) while observing a shaft-type free space (3.
    Type: Application
    Filed: April 10, 2012
    Publication date: May 22, 2014
    Applicant: SCHULER PRESSEN GmbH
    Inventors: Thomas Spiesshofer, Gebhard Engler, Markus Mueller
  • Patent number: 7681427
    Abstract: A device for the production and/or machining of parts, in particular for the production of stampings, by at least one die which is capable of being put under pressure and/or force, and which has at least one plate and one die element, the die element being supported in the plate against pressure elements via a resilient element.
    Type: Grant
    Filed: October 5, 2005
    Date of Patent: March 23, 2010
    Assignee: Feintool International Management AG
    Inventors: Michael Op de Hipt, Rudolf Welk
  • Patent number: 7637138
    Abstract: The invention concerns a multistage press, at which within the machine-mounted clamping plate (1), an insert (3) is arranged which can alternatingly be moved in the direction towards the press plunger (2) and away from it. The insert (3) is moved up and down by a cam drive actuated by the press main drive with lifting and lowering cams (5), whose cam tracks (8a, 8b) are traced by lifting rollers (6) and lowering rollers (7) under compressive prestress. Such a multistage press can be operated with a high number of strokes per minute and has, at the same time, an excellent precision of the stroke movement.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: December 29, 2009
    Assignee: Bruderer AG
    Inventor: Josef Thomas Hafner
  • Patent number: 7260971
    Abstract: An apparatus for locking a sheet of metal to be shaped in a press, comprising at least one fluid-operated actuator for translational motion of a first sheet presser, adapted to support, in an initial operation step a sheet of metal to be shaped, arranged above a first lower die part, coupled to the base of the press. The first presser cooperates with a second presser, coupled to the second die part associated with the upper ram of the press, in locking a perimetric portion of the sheet of metal during shaping. The actuators are part of a circuit for regenerating and supplying the working fluid, provided with devices for the delayed return of the actuators, upon opening the press, for shaped sheet protection.
    Type: Grant
    Filed: May 1, 2006
    Date of Patent: August 28, 2007
    Assignee: Special Springs S.R.L.
    Inventors: Augusto Cappeller, Massimo Fiorese, Daniel Fantinato
  • Patent number: 6460396
    Abstract: This invention relates to a hydraulic force modulator used in a power press to provide a predetermined force with a defined force applied by a ram of the press at defined incremental positions of the ram relative to a stationary part of the press. A moveable plate moves relative to a base plate. A resilient pneumatic bellows has one end sealingly mounted on the moveable plate. The resilient pneumatic bellows has an opposite end sealingly mounted on the base plate. A vessel is connected on one of the plates. A metering cylinder is mounted on the same plate as the vessel and is positioned within the vessel. A piston assembly is mounted in the metering cylinder. A piston rod has one end connected to the piston assembly and the opposite end connected to the other of the plates.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: October 8, 2002
    Assignee: Metalforming Controls Corp.
    Inventors: Kenneth L. Smedberg, George J. Bozich, Ronald S. Boge
  • Patent number: 6237381
    Abstract: This invention relates to a hydraulic force modulator used in a power press to provide a predetermined force with a defined force applied by a ram of the press at defined incremental positions of the ram relative to a stationary part of the press. A moveable plate moves relative to a base plate. A resilient pneumatic bellows has one end sealingly mounted on the moveable plate. The resilient pneumatic bellows has an opposite end sealingly mounted on the base plate. A vessel is connected on one of the plates. A metering cylinder is mounted on the same plate as the vessel and is positioned within the vessel. A piston assembly is mounted in the metering cylinder. A piston rod has one end connected to the piston assembly and the opposite end connected to the other of the plates.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: May 29, 2001
    Assignee: Smedberg Industries, Ltd.
    Inventors: Kenneth L. Smedberg, George J. Bozich, Ronald S. Boge
  • Patent number: 5813275
    Abstract: A safety circuit for a press die cushion wherein the press die cushion has a pad that is resiliently supported by a cushion cylinder which is supplied with a pilot pressure via an air delivery circuit, and wherein the press die cushion has a locking circuit for locking the pad. The safety circuit includes a first electromagnetic valve which is electrically switchable in two directions for controlling delivery of the pilot pressure to an air supply valve in the air delivery circuit to the cushion cylinder, and for controlling the air supply valve in order to lift the pad up and down. An on and off valve is disposed in a pilot pressure delivery passage of the air delivery circuit, and is opened when the pad lies in a vicinity of a lower limit position. A second electromagnetic valve is connected to the on and off valve.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: September 29, 1998
    Assignee: Komatsu Ltd.
    Inventors: Yasuo Kawakami, Masami Suzuki
  • Patent number: 5720849
    Abstract: A wafer mounting device transfers a wafer coated with an adhesive and pastes the wafer on a mount plate while maintaining the thickness of the adhesive uniform. A chuck plate is carried by a rotatable transfer arm and holds the adhesive-coated wafer by suction so that the wafer can be moved in a direction of rotation of the arm. The chuck plate is heated by a heater to substantially the same temperature as the wafer. A flexible pressing pad is disposed between the chuck plate and the transfer arm for biasing the chuck plate in a direction away from the arm, and a flexible pressure-adjusting pad is provided for biasing the chuck plate in a direction toward the arm. The pressing pad and the pressure-adjusting pad have hollow sections filled with pressurized fluid, and the pressure of the fluid within each pad is regulated to thereby control the pressing force of the chuck plate so that the wafer is placed softly on the mount plate.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: February 24, 1998
    Assignee: Enya Systems, Limited
    Inventors: Noriyoshi Yokosuka, Shizuo Suzuki
  • Patent number: 5609099
    Abstract: A shutheight adjustment assembly of a mechanical press including an adjustment nut rotatably connected to an adjustment screw. Hydrostatic bearing pads are provided below the adjustment nut to reduce frictional forces associated with nut rotation and to provide a squeeze film thickness to withstand large press loadings. A hydraulic chamber supplied with pressurized fluid is positioned above the adjustment nut and produces a preload force on the hydrostatic bearing pads. Hydrostatic bearing pads are also arranged radially outward of the adjustment nut to radially center the nut during operation. A hydraulic chamber between the adjustment nut and screw may be furnished to resist bolster rebound during press operations.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: March 11, 1997
    Assignee: The Minster Machine Company
    Inventors: Bradley A. Burns, Brian A. Watercutter
  • Patent number: 5544576
    Abstract: In a mechanical pressing machine, a flywheel is fixedly mounted on an input shaft, and a drive cam plate is fixedly mounted on the input shaft intermediate opposite ends thereof, and a torque compensation plate cam is mounted on the other end of the input shaft. A cam follower mounted on a distal end of a piston rod of a resilient force-producing device is held in pressing contact with the torque compensation plate cam so as to cancel a load fluctuation produced on the input shaft. The resilient force-producing device employs a compression coil spring or an air spring. With this construction, a periodic inertial load fluctuation, repeatedly produced for every revolution during the operation of the mechanical press, is compensated for by the system for reserving energy, and hence is canceled, thereby balancing the energy, so that variations in rotation of the input shaft are eliminated, thereby reducing vibrations and noises.
    Type: Grant
    Filed: October 25, 1994
    Date of Patent: August 13, 1996
    Assignee: Sankyo Seisakusho Co.
    Inventor: Heizaburo Kato
  • Patent number: 5499525
    Abstract: The invention relates to a drive for a press, in particular for a sheet metal forming press, the press including a press ram which can be moved up and down and a hydraulic movable counter support. The counter support can be moved in a forward stroke in the direction towards the press ram via at least one hydraulic cylinder by a first hydrostatic machine, and in a return stroke by the press ram. In known presses, during the return stroke of the counter support, the pressure medium is displaced from the hydraulic cylinder while a predetermined pressure is maintained by means of a pressure relief valve (pressure limiting valve) or a throttle valve (flow control valve). The balance sheet of energy of such a drive of such a press is to be improved. This is achieved by providing that the first hydrostatic machine is a pressure controlled machine, preferably an axial piston machine. Preferably, the axial piston machine can be swiveled in both directions, i.e. pivoted towards both sides.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: March 19, 1996
    Assignee: Mannesmann Rexroth GmbH
    Inventors: Rolf Kordak, Michael Reinert, Thassilo Maxeiner
  • Patent number: 5299444
    Abstract: A hydraulic cushioning apparatus for a press having an upper and a lower die assembly (3, 9) for forming a sheet-like workpiece (6), including hydraulic cylinders (54) incorporated in one of the upper and lower die assemblies, and pressure pins (52) linked with the respective hydraulic cylinders. The pressure pins are reciprocable to apply a cushioning force (F) to the workpiece, in a pressing action of said die assemblies on the workpiece, so as to force the workpiece against the other die assembly. The apparatus is equipped with a hydraulic power supply device (72, 100, 117, 272) for delivering a pressurized fluid to the hydraulic cylinders (54). The power supply device is capable of changing an initial hydraulic pressure (P.sub.0) of the fluid to be applied to the hydraulic cylinders before the pressing action of said die assemblies.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: April 5, 1994
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazunari Kirii, Tsutomu Ono, Masahiro Shinabe
  • Patent number: 5201204
    Abstract: A control system for automatically counterbalancing the ram and tooling of a mechanical press by the measurement of strain in a press component or components subject to stress during operation of the press. The air pressure in one or more counterbalancing cylinders is varied to maintain balanced conditions in response to the strain measured at the top of the press cycle.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: April 13, 1993
    Inventors: William Hinterman, Timothy Hinterman
  • Patent number: 5150598
    Abstract: An apparatus for scribing grain-oriented electrical steel strip has a movable die attached to a reciprocating drive and an opposite fixed die. A strip held between the two dies is scribed by the action of the movable die that is moved back and forth by the reciprocating drive. The fixed die positioned with the stroke of the movable die is supported by a plurality of cylinders connected to an accumulator whose pressure is preset to a level of the deformation resistance corresponding to the amount of deflection that varies with the depth of the impressions scribed on the strip.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: September 29, 1992
    Assignees: Nippon Steel Corp., Nittetsu Plant Designing Corp.
    Inventors: Takayuki Uchida, Satoshi Ide, Masahiro Yamamoto, Atsushi Yumoto
  • Patent number: 5123342
    Abstract: The present invention concerns a mechanical, low-noise press, particularly of the screw type, comprising a tup-bearing ram connected with a driving screw, rotatably connected with a lead nut, which is integrally fixed on the frame supporting the press. The press also comprises sealing means which define, together with the mating surfaces of the screw and of the lead nut, a chamber, having a pre-determined volume, adapted to collect an incompressible medium, such as a lubricating oil, and a circulation mechanism in order to maintain within the chamber a controlled delivery of the medium, which delivery insures the presence of a constant spacing film of medium between the mating surfaces during the operation phase of the press, so as to prevent the direct contact between the screw and the lead nut, thereby absorbing the vibrations and the collisions generated by their interaction.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: June 23, 1992
    Assignee: Vaccari S.p.A.
    Inventor: Roberto Camossi
  • Patent number: 5062357
    Abstract: The press has a pneumatically operated piston and cylinder mounted beneath a work plate, and linked to an upper press plate by rods extending through the work plate to provide compression in a die-set area defined between the upper press plate and the work plate. The pneumatically operated piston and cylinder are encased within an enclosed base which is insulated. The movable cylinder acts against springs also mounted within the base which cause the press plate to rebound after a pneumatically operated downstroke.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: November 5, 1991
    Assignee: Innovated, Inc.
    Inventors: Robert B. Senior, Edward L. Hvizdos
  • Patent number: 5009091
    Abstract: A control system for automatic counterbalancing the ram of a mechanical press by measuring energy level of the press flywheel and varying air pressure in a counterbalancing cylinder. Energy level is derived from a measurement of the linear speed of a moving press component at a fixed point in the ram reciprocation cycle.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: April 23, 1991
    Inventors: William H. Hinterman, Timothy W. Hinterman
  • Patent number: 4969344
    Abstract: A control system for automatic counterbalancing the ram of a mechanical press by measuring energy level of the press flywheel and varying air pressure in a counterbalancing cylinder. Energy level is derived from a measurement of the rotational speed of the counterweight at a fixed point in the ram reciprocation cycle.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: November 13, 1990
    Inventors: William H. Hinterman, Timothy W. Hinterman
  • Patent number: 4921419
    Abstract: A hydraulic press includes a press plate mounted for executing working strokes and return strokes; a hydraulic countersupport braking cylinder supported at an end zone of the working stroke for engaging the press plate at an end portion of the working stroke to cause deceleration of the press plate by the hydraulic countersupport braking cylinder; and a hydraulic shock absorber connected between the press plate and the hydraulic countersupport braking cylinder. The hydraulic shock absorber is arranged for compression from an expanded state by the press plate in an end zone of the working strokes. The hydraulic shock absorber has a shock absorber chamber containing hydraulic fluid; a throttle for setting a braking force in the shock absorber chamber to a magnitude smaller than the braking force of the hydraulic countersupport braking cylinder; and a resetting arrangement for returning the shock absorber into its expanded state.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: May 1, 1990
    Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventor: Richard Brussel
  • Patent number: 4825681
    Abstract: The present invention relates to a pneumatic press counterbalance and cushion construction. The press counterbalance holds certain parts of a press in the same relative engagement during the return stroke of a ram of the press as during the power stroke of that ram. The counterbalance includes a fixed plate adapted for connection to a part of the press. A pneumatic bellows has one end connected to the fixed plate. A movable plate is connected to the opposite end of the pneumatic bellows. A connector rod is connected to the movable plate and to another part of the press which part is movable relative to the part to which the fixed plate is connected. The pneumatic cushion includes a resilient bellows having one end connected to the fixed plate. A bellows connector is connected to the other end of the bellows. A second bellows has one end connected to the bellows and the other end connected to the movable plate.
    Type: Grant
    Filed: January 22, 1987
    Date of Patent: May 2, 1989
    Assignee: Kenneth L. Smedberg
    Inventors: Kenneth L. Smedberg, George J. Bozich, Robert J. Kotynski
  • Patent number: 4796460
    Abstract: A die cushion construction for use in a press is the subject matter of the present invention. The instant die cushion construction includes a fixed plate connected to the press. A resilient cushion actuator has one end sealingly connected to the fixed plate. The resilient cushion actuator has an opposite end sealingly connected to a movable plate. The movable plate is adapted for connection to a portion of a die mounted in the press. A resilient snubber actuator has one end fixed relative to the fixed plate. The snubber actuator has an opposite movable end connected to the movable plate for affecting the rate of movement of the movable plate and a portion of the die. The snubber actuator is connected to means for allowing fluid to flow into the snubber actuator when the movable plate moves toward the snubber actuator.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: January 10, 1989
    Assignee: Kenneth L. Smedberg
    Inventors: Kenneth L. Smedberg, George J. Bozich, Robert J. Kotynski
  • Patent number: 4736615
    Abstract: The present invention relates to a pneumatic press counterbalance which holds selected parts of a press in the same relative engagement during the return stroke of a ram as during the power stroke of that ram. The counterbalance includes a base plate adapted for connection to a first part of a press. An elongated cylindrical base tube having an open end is mounted on the base plate and has a center axis substantially perpendicular to the base plate. A resilient unconfined tubular bellows for holding air has a pair of opposed ends. The bellows has an elongated tubular resilient sleeve connecting the open ends and formed integral therewith. One of the open ends of the bellows is sealingly connected to the base tube. A first portion of the tubular sleeve surrounds a portion of the base tube. A second portion of the tubular sleeve is connected to the first portion by a fold in the sleeve and has a part surrounding the first portion. A movable plate is connected to the other end of the bellows.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: April 12, 1988
    Assignee: Kenneth L. Smedberg
    Inventors: Kenneth L. Smedberg, George J. Bozich, Robert J. Kotynski
  • Patent number: 4729300
    Abstract: The mechanical press, particularly a toggle press, comprises a hydraulic member connected between the force transmitting and force receiving components, such as a toggle joint, carriage, anvil, and platen. The anvil is mounted on a hydraulic member which is located in a hydraulic chamber. The hydraulic member acts as a press cushion which is continuously connected with a large volume fluid reservoir which is maintained constantly under a gas pressure. The hydraulic member has a maximum filling volume which is at most 1% of the volume of the fluid reservoir.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: March 8, 1988
    Assignee: Fa. Theodor Grabener Pressensysteme GmbH & Co. KG
    Inventor: Theodor Klein
  • Patent number: 4635466
    Abstract: In a die cushion apparatus, a die cushion mechanism for achieving a die cushioning capability as relying upon a preset pneumatic pressure is provided with a hydraulic pressure chamber into which a piston connected to a die cushion pad is fitted, the hydraulic pressure chamber is provided with a hydraulic pressure feed circuit and an exhaust circuit, a relief valve whose relief pressure is controllable is disposed in the exhaust circuit, and relief pressure control means is coupled to the relief valve.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: January 13, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Seiji Seki, Kiyoji Aoshima
  • Patent number: 4523521
    Abstract: A spindle press in which a lubricant is displaced by relative movement of the threaded spindle and the ram displaced thereby, at least on a return stroke of the ram effected by a fluid operated jack. According to the invention, the press is provided with a control piston which blocks the lubricant flow as the ram approaches a deadpoint position at the end of its return stroke so as to enable the lubricant trapped between the spindle and the ram to damp the end of the return stroke.
    Type: Grant
    Filed: September 16, 1983
    Date of Patent: June 18, 1985
    Assignee: G. Siempelkamp GmbH & Co.
    Inventor: Eduard J. C. Huydts
  • Patent number: 4479844
    Abstract: An impulse-action heat-sealer for manufacturing a sealed article, as a bag or the like, by pressingly keeping the portions to be sealed and effecting the sealing by means of heating with short-time electric current. The sealer has a pressing-sealer lever as is actuated electromagnetically, and is further equipped with an air-damper to function as a buffer for the actuating movement of the pressing-sealer lever.
    Type: Grant
    Filed: March 21, 1983
    Date of Patent: October 30, 1984
    Assignee: Yugen Kaisha Fuji Seisakusho
    Inventor: Teruo Yamada
  • Patent number: 4308735
    Abstract: An automatic pressure control apparatus for a counterbalancer of a press having a movable portion including a crank, a connecting rod, a slide and an upper die detachably mounted on the slide, the apparatus comprising a cylinder mounted on a frame of the press, a piston rod of the cylinder being connected to the slide, a tank for pressurized fluid connected to a source of pressurized fluid and a rod-side chamber of the cylinder, a pressurized fluid supply and ventilation control unit disposed between the source of the pressurized fluid and the tank, the unit having a pilot operated main regulator valve for regulating the pressurized fluid flowing therethrough, a plurality of pilot regulator valves connected with the main regulator valve for controlling the same, a detector for detecting the amount of displacement of a reference point given on the movable portion of the press in a preselected posture thereof in response to the interchange of the upper dies with varying weights, and a solenoid valve for selecti
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: January 5, 1982
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Ikuo Nishi
  • Patent number: 4283929
    Abstract: A counterbalance cylinder pressure control for a mechanical press which has a slide, a die punch mounted on the slide and a die shoe. A coded plug is attached to the die shoe and means are provided for reading the code on the plug which indicates the weight of the die punch associated with that die shoe. A voltage signal produced from the decoding of the plug is used in a servo system to control the air pressure in the counterbalance cylinders. When a new die set is placed in the mechanical press, the coded plug attached to the die shoe is read and the servo system operates to reset the counterbalance cylinder pressure to the correct value.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: August 18, 1981
    Assignee: Danly Machine Corporation
    Inventor: Francis E. Heiberger
  • Patent number: 4221626
    Abstract: An improved heat seal machine having a lever linkage that cooperates with an electromagnet clamp to hold down a movable platen in heat sealing relation against a base platen after manual closure of the two platens into sealing relation. A spring operated opener returns the movable platen into home position after the electromagnet clamp is released, the opener cooperating with a dampener device that controls the opening rate of the movable platen.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: September 9, 1980
    Assignee: Natmar, Inc.
    Inventor: Bobby J. Clay
  • Patent number: 4034666
    Abstract: The crank press comprises a frame with a bed for accommodating the workpiece and with guides mounted on said frame perpendicularly to the bed surface, said guides supporting a slide which carries the working tool and being connected with the crankshaft by a kinematic chain comprising an engaging mechanism for starting the slide on its working stroke, said mechanism being made in the form of a power cylinder.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: July 12, 1977
    Inventors: Oleg Pavlovich Bigun, Grigory Matveevich Rodov
  • Patent number: 4013002
    Abstract: A process and apparatus for the positive actuation of a weight compensating mechanism for a ram of a press accommodating a tool set. The process includes the detecting of at least one condition indicative of the changing of a tool set of the press, preventing working operation of the press in response to such detected condition, and then initiating operation of the weight compensating mechanism. The process also includes the enabling of the working operation of the press upon completion of the weight compensating operation. The apparatus for carrying out the process includes at least one signal generator for providing an output indicative of the changing of a tool set, a device for preventing working operation of the press in response to the detection of such condition and a control arrangement for initiating operation of the weight compensating mechanism in accordance with sensed conditions of the press.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: March 22, 1977
    Assignee: L. Schuler GmbH
    Inventors: Franz Schneider, Burkhard Schumann
  • Patent number: 4011809
    Abstract: A press having mechanical drive elements acting on the ram through at least one pressure cushion serving as a hydraulic overload safety device, at least one cylinder-piston unit operating under the effect of a compressed fluid for counterbalancing the weight of the ram associated with an upper die of the press, and a control system for adjusting fluid pressure in the cylinder-piston unit to a value for counterbalancing the weight. The control system includes a pressure relief valve and a pressure meter associated with the pressure cushion wherein the meter detects the pressure in the pressure cushion in a measuring range including a predetermined value. An actuating member serves for initiating a counterbalancing operation which includes operation of the pressure relief valve and control of supply and discharge valves for supplying and discharging fluid to and/or from the cylinder-piston unit.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: March 15, 1977
    Assignee: L. Schuler GmbH
    Inventors: Eugen Waller, Wolfram Buchler, Rolf Kellenbenz, Franz Schneider, Burkhard Schumann