US3783662A - Control circuit for magnetic actuator - Google Patents

Control circuit for magnetic actuator Download PDF

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Publication number
US3783662A
US3783662A US00253039A US3783662DA US3783662A US 3783662 A US3783662 A US 3783662A US 00253039 A US00253039 A US 00253039A US 3783662D A US3783662D A US 3783662DA US 3783662 A US3783662 A US 3783662A
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Prior art keywords
ram
die
force
electromagnets
housing
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US00253039A
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English (en)
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J Keller
B Longenecker
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TE Connectivity Corp
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AMP Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/42—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by magnetic means, e.g. electromagnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/285—Arrangements for preventing distortion of, or damage to, presses or parts thereof preventing a full press stroke if there is an obstruction in the working area
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool

Definitions

  • the required force could be manually developed.
  • the force could be directly applied to the handles of a hand tool which operates as levers to drive the dies in a controlled displacement.
  • the closing of the dies would effect an article forming operation if the dies are worked against sheet metal stock to cut away metal in a predefined pattern leaving a desired configuration.
  • the metal cutting step could be followed by a forming step to form the cut pattern into an article such as an electrical terminal.
  • the closing of the dies could also effect a connecting operation such as the crimping of a preformed electrical terminal to a wire.
  • the terminal and wire are situated between the dies. As the dies close, portions of the terminal deform around the wire to thereby realize the desired connection of the terminal to the wire.
  • the die closing apparatus must use an energy source for effecting die closure which is other than manual. More specifically, where rapid cycling rates are required, one die may be fixed to an anvil while the other die'would be fixed to a ram.
  • the energy source for driving the ram took the form of an inertial system wherein energy is stored in a moving part such as a flywheel or the ram itself, or a pressure system wherein energy is stored in a fluid maintained under pressure in a vessel.
  • each of these die closing systems create problems which affect the efficien'cy of the apparatus and the quality of the finished product.
  • the Keller system solves these problems by providing a magnetically actuated die closing system.
  • one die is fixed to an anvil while the second die is fixed to a ram.
  • the anvil is mounted in a housing containing a first electromagnet.
  • a second electromagnet is mounted on the ram and made moveable therewith.
  • the force required for die closing is controlled by controlling the current in the coils of the electromagnets. More specifically, the coils in the first and second electromagnets are wound in an aiding sense so that when current flows therethrough the magnets attract. The closing of the magnets is imparted to the dies.
  • the magnetically actuated die closing system permits precise control over the force applied to the terminal to be crimped to a wire by providing control over the velocity and acceleration of the ram as well as control over the dwell time, that is, the time during which the force is exerted on the terminal.
  • the Keller patent describes two circuit arrangements for controlling the current applied to the electromagnets.
  • a pulse predefined in both duration and amplitude, is applied to the magnets.
  • the duration and amplitude of the pulse are derived from experience with a particular workpiece.
  • the connection of articles which in this case, is the crimping of a terminal to a wire
  • a signal is developed by a force transducer.
  • the force transducer may be any conventional transducer which converts a mechanical force into a proportional electrical signal. Examples of such transducers are piezoelectric, and semiconductor strain gages.
  • the transducer produced signal is compared to a reference signal which is proportional to a predefined force. If the die produced force is greater than or less than the predefined force, the current in the magnets is varied tobring the developed force into agreement with the predefined force.
  • the force is applied to the articles being connected for a predetermined dwell time through the use of a time constant circuit.
  • the present invention provides an improved control circuit which overcomes the deficiencies of the control circuits described in the Keller patent.
  • the control circuit also includes a let-down circuit for bringing the ram into initial contact with the workpiece which in the preferred embodiment is a contact to be crimped to a wire, at a relatively low average velocity, whereby the ram meets the terminal with little kinetic energy.
  • the let-down circuit is deactivated to cause a rapid increase in the coil current thus developing the large force required to connect the preformed article to another article or to form the article by cutting, forming, etc.
  • the impulse developed as the ram meets the terminal may cause damage thereto as well as a deterioration of the quality of the crimp.
  • the ram is gently brought into initial contact with the terminal, with the crimping force subsequently applied, terminal damage is avoided and high quality crimps are realized.
  • control circuit is provided with a clock circuit which triggers to end the die closing cycle if the critical force is not reached within a predetermined time.
  • An additional safety feature is provided in the form of an electro-optic guard.
  • a die closing cycle can not be initiated or if previously started will be immediately tenninated if a foreign object of at least a predetermined size and shape is placed between the dies. Thus, if an operator should inadvertently place his hand between the dies, a die closing cycle cannot be initiated, and an initiated cycle is terminated.
  • FIG. 1 is a prospective view of a magnetic actuator for crimping terminals with a portion of an actuator housing section to show the electromagnet in an open position;
  • FIG. 2 is a view similar to that of FIG. 1 but with the electromagnets in a closed position with the electromagnets sectioned to show the magnet coils and bearing the structure supporting the upper electromagnet and the ram shaft of the mechanism;
  • FIG. 3 is a block diagram of a prior art control circuit for use with a magnetically actuated die closing apparatus
  • FIG. 4 is a block diagram of the control circuit of the present invention.
  • FIG. 5 is a schematic diagram showing in detail the control circuit of the present invention.
  • FIGS. 1 and 2 correspond essentially to the like numbered figures in the Keller patent. These figures have been modified by the inclusion of a switch 33 and photoresponsive elements 53 in accordance with the teachings of the present invention.
  • a bench mounted press P is shown relative to terminating an open barrel electrical terminal T to a stripped insulated electrical lead L.
  • the apparatus of FIGS. 1 and 2 will generally include a number of features not shown in these drawings. Specifically, the drawings do not show a feed mechanism for feeding terminals and/or a feed mechanism for feeding stripped leads between the dies. These details have been left off for the sake of clarity since they are not essential for a full understanding of the present invention.
  • the press includes a frame or housing comprised of a metal base plate 12 resting on the top of a work bench or the like 10. To the metal base plate 12 is attached an upstanding support portion 18 carrying a box like structure in which is mounted a magnetic actuator mechanism. The mechanism is connected to a ram 20 having a die 22 on its lower end. As can be seen more clearly in FIG. 2, ram 20 is connected to a ram shaft 24 which extends vertically up through the support structure 18.
  • the top of the ram shaft 24 includes a flange member 26 which serves as a stop for a spring member 28 made to surround the upper portion of the shaft 24 and bear against the top of housing 18 around the aperture therein through which shaft 24 travels during operation of the press.
  • a suitable auxilary bearing shown as 29 may be provided in the top of housing 18 to support shaft 24 for sliding movement relative thereto.
  • Spring member 28 is a compression spring of sufficient strength to push the ram shaft and connected structure rapidly upward to the position shown in FIG. 1 in the absence of a force drawing the magnets together.
  • the lower magnet 30 of the die closing apparatus is fixed to a transverse plate 55 which is part of the housing structure 18 and is thereby fixed relative to ram shaft movement. This magnet has a central aperture through which the ram shaft 24 extends, the latter being supported therein for longitudinal sliding movement relative to the housing 18 by means of a conventional main bearing 36.
  • the upper magnet 32 of the die closing apparatus is fixed to the shaft by a keyed and threaded sleeve shown as 38 in FIG. 2.
  • the upper surface of the fixed magnet 30 carries a cushion in the form of a sheet 34 of plastic such as Mylar or the like which prevents surface engagement of the two magnets during closure in the position shown in FIG. 2 should the unit be activated with no material between the dies. Sheet 34 also maintains a maximum gap between the two magnets to prevent the magnets from sticking together.
  • Each of the magnets includes a recess which extends around in an angular fashion with the body of the magnet.
  • the recesses are shown as 40 and 43 in FIG. 2. These recesses contain coils WI and WII and are terminated in a suitable manner, to be described more fully below, to a power supply and control circuit.
  • the plate 12 contains a fixed die 50 secured thereto in alignment with die 22.
  • a force transducer 52 is provided beneath die 50. This force transducer is coupled in a manner to be described to the control circuitry of the present invention illustrated generally in FIGS. 1 and 2 as box 63.
  • the apparatus also includes switch 33, one contact of which is mounted on magnet 32 while the other contact is mounted on magnet 30.
  • This switch is associated with the let-down circuit and acts to deactivate the circuit after initial engagement of die 22 with the terminal or other workpiece.
  • the metal base plate 12 includes photoresponsive element 53. These elements may take the form of conventional photoconductors. On the underside of plate 55 there is mounted light sources (not shown) for controlling the electrical output of the photoresponsive elements 53. Operation of these elements in relation to the control circuit of the present invention will be discussed more fully below.
  • the apparatus In operation of press P, the apparatus is initially in the position shown in FIG. 1 with die 22 in an upward position displaced from lower die 50.
  • a terminal T When used for crimping, a terminal T is positioned on the lower die with the stripped portion of the lead L positioned in the crimp portion of the terminal.
  • Energization of coils WI and WII results in the generation of a magnetic field in magnets 30 and 32 which develops a force attracting the two magnets together. Due to the fact that magnet 30 is so fixed tothe support structure 18, magnet closure draws or forces ram downwardly carrying die 22 against the terminal T and against the lower die 50. As this occurs, the force involved is detected or sensed by the transducer 52 which develops a signal which is used to selectively terminate the die closing cycle.
  • FIG. 3 illustrates a prior control circuit for use with a magnetically actuated die closing apparatus.
  • a power supply 66 provides an input signal to a control circuit 68.
  • the output of the control circuit is used to actuate the electromagnets denoted generally as 70.
  • the force created on the terminal T is converted into an electrical signal by the force transducer corresponding to transducer 52 of FIGS. 1 and 2 and shown generally as 74 of FIG. 3.
  • the output of the transducer is fed to a comparator 72 which compares the voltage proportional to the applied force to a voltage proportional to a reference force. When these two voltages are not in agreement, an error signal is supplied to the control circuit 68 to increase or decrease the signal to the electromagnets to respectively increase or decrease the magnetic force between magnets 30 and 32 until the force developed on the terminal T and die 50 corresponds to the desired force. It should be noted, however, that the reaching of the predetermined force does not terminate the crimping cycles. The dwell time is controlled by a timing circuit. Further, the circuit of FIG. 3 does not possess safety features necessary for protecting both the apparatus and operator.
  • FIG. 4 is a block diagram of the control circuit.
  • the control circuit is provided with a force responsive control circuit 114 which causes termination of a crimping cycle when the force on the terminal reaches the critical value.
  • Magnets 30 and 32 are initially in their displaced position illustrated in FIG. 1.
  • Switch 116 which may be a foot switch, for example, is closed to initiate energization of the electromagnets.
  • the start circuit As switch 116 is closed, the start circuit generates a start signal to energize the driving circuit 104.
  • the start signal is present during the entire cycle.
  • the energized driving circuit 104 permits current to flow from the D.C. power supply 100 through coils WI and WII of the electromagnets 30 and 32.
  • a regulated DC power supply 102 is used to energize the circuit elements of the control circuit.
  • the output of D.C. power supply 100 is substantially greater than the output of the regulated supply 102.
  • power supply 100 supplies approximately 130 volts DC while the regulated power supply 102 supplies 30 volts D.C.
  • the relatively high potential provided by the power supply 100 is needed to produce the large crimping force, in a given time often in the area of 2,000 pounds, required to effect a quality crimp.
  • the let-down circuit is deactivated thereby increasing the drive current which causes the attractive force between the magnets to increase.
  • the increased drive current permits the required crimping force to be rapidly developed between the dies.
  • the letdown circuit operates to intermittently deactivate the disable circuit 109 thereby intermittently interrupting the drive current passing through the driving circuit I04. Intermittent interruption of the drive current reduces its average value thus limiting the closing force.
  • the force between the dies and thus the force on the terminal T is detected by the force transducer 52 which is applied to the force control circuit N4 and transformed into a proportional potential.
  • the force control circuit 114 also includes a reference potential proportional to a critical, force, the attainment of which signities that a crimp has been effected.
  • Circuit 1'14 also includes a comparator which compares the reference potential with the force transducer supplied potential and when the two correspond, generates an output signal which operates on the start circuit 106 to cut off the signal thus terminating the crimping cycle.
  • the electro-optic guard 12 comes into action to produce an output signal which operates on start circuit 108 to cut off the start signal.
  • control circuit includes another safety feature which operates to terminate the closing cycle should such a foreign object appear between the dies.
  • the added safety feature for terminating a cycle is the clock circuit 110.
  • This circuit is a timing circuit activated upon the initiation of a die closing cycle. If the critical force is not reached within a predetermined time, the clock circuit generates an output signal which signals the start circuit 106 to cut off the start signal. It also signals the disable circuit 109 to function. The output fromthe disable circuit 109 causes the generation of a warning signal to notify the operator that there is trouble in the apparatus and also prevents further cycles from being initiated until the control circuit is manually reset by the operator.
  • FIG. 5 Operation of the control circuit of the present invention may be more fully understood by referring to FIG. 5. Like numbered elements in FIGS. 1-5 correspond to common elements.
  • switch 116 is closed. Prior to the closing of switch 116, capacitor C has charged through the 30 volt line 113 from the regulated DC power supply line 102. The closing of switch 116 causes the potential across capacitor C to appear at the anode of unijunction transistor 0,.
  • This transistor may be a 2N 6027 unijunction transistor. The unijunction transistor becomes conductive when the anode potential is in predetermined relationship with the gate potential.
  • a negative pulse may be supplied to the anode to bring the anode potential to approximately ground potential.
  • the application of the capacitor C voltage to the anode of transistor Q causes it to conduct.
  • the potential at node a in the driving circuit 104 rises thereby turning on transistor Q,,.
  • transistor Q,, conducts,, transistors Q, Q also conduct, to energize WI and W1] thereby creating an attractive force between the magnets 30 and 32.
  • a feedback coil L Forming part of the let-down circuit 112 is a feedback coil L, physically placed in the vicinity of coils WI and W1] whereby current in these coils cause an induced current in the feedback coil.
  • Switch 33 is initially open.
  • One terminal of feedback coil L is connected to the 30 volt line 113 through a suitable resistance while the second terminal is coupled to the inverting input of an operational amplifier OP, connected as a trigger circuit.
  • Operational amplifier OP can be a conventional Schmitt trigger. Prior to encrgization of coil L the output potential of the trigger circuit OP, is low thereby retaining transistor Q, in its non-conducting state.
  • the potential across the capacitor C previously charged from line 113 drops.
  • the potential at node a of the driving circuit 104 again increases to turn on the driving circuit to cause current flow in coils W1 and Wll.
  • the driving circuit 104 thus, rapidly energizes and de-energizes limiting the average current flow in coils WI and Wll.
  • This small average current causes a small attractive force to be developed between the magnets thus limiting the velocity at which the magnets 30 and 32 initially approach each other.
  • die 22 is brought gently down upon the terminal T. As die 22 meets the terminal, switch 33 is closed to keep the output of the trigger circuit OP, at a low level thereby retaining transistors Q, and 0, off.
  • switch 33 Operation of switch 33 can best be understood by referring to FIGS. 1 and 2.
  • One contact of the switch is mounted on magnet while the other contact on magnet 32.
  • the contacts close when these magnets are separated by a predefined distance. This distance corresponds to the distance between die 22 and when die 22 makes initial contact with terminal T.
  • the force on the terminal is monitored by the force transducer 52.
  • the output of transducer 52 is coupled to the force control circuit 114.
  • the force control circuit also includes an operational amplifier OP connected as a comparator circuit.
  • the output of circuit OP is connected to the gate terminal of unijunction transistor Q
  • the anode of transistor 0, is connected to a reference voltage source in the form of a potentiometer 122.
  • the potential at the wiper of the potentiometer 122 is proportional to the desired critical force.
  • transistor 0 is triggered on.
  • the cathode of transistor 0, is coupled to the base of transistor 0, of the start circuit 108. Conduction of transistor Q, biases transistor 0, into conduction causing the anode of transistor 0,, to ap proach ground potential turning it off. When transistor Q turns off, the potential at anode a of the driving circuit 104 drops to a value sufficient to turn off transistor 0,, thereby disabling the driving circuit 104. In this manner, as soon as the critical force is reached, driving current is blocked from the coils and the die closing cycle is terminated. The magnets return to their initial open position under the control of bias spring 28. The critical force for terminating the closing cycle can be easily varied by varying the potential with the potentiometer 122.
  • the control circuit is provided with a clock circuit operating in conjunction with the let-down circuit 112.
  • the start circuit 108 is activated to cause transistor O to conduct
  • transistor Q of the clock circuit turns on thereby allowing capacitor C, to charge.
  • Capacitor C forms a portion of a time constant circuit which includes resistors 124 and 126 as well as transistor 0;.
  • Capacitor C continues to charge to a threshold voltage which turns on transistor 0,. It should be remembered that as capacitor C, charges, die 22 is being slowly brought down into engagement with the screwdriver through the operation of a let-down circuit 112. The applied force is so low that no damage is caused to the dies.
  • Switch 33 is so arranged that its contacts will not close when a relatively large object such as the screwdriver is resting on the die 50. This assumes that the height of the foreign object is greater than that of the contact to be erimped. Since this is generally the case, when die 22 makes its initial contact with the foreign object, the magnets 30 and 32 have not closed a sufficient distance to permit the contacts of switch 33 to engage. Thus, the let-down circuit remains operative thereby limiting the force applied by the magnet and the critical force will never be reached.
  • transistor Q When the threshold voltage of transistor Q is reached, it conducts thereby causing transistor Q of the start circuit to turn on which results in the turning off of transistor Q
  • the turning on of transistor 0. also causes transistor O to conduct which biases transistors Q and Q of the disable circuit 109 into conduction.
  • Q When Q conducts, light 111 glows indicating to the operator that there is trouble in the apparatus.
  • Q When Q, is on, node a is prevented from rising to the potential necessary to turn on the driving circuit 104 even if another die closing cycle is initiated.
  • Transistor Q and Q remain conducting until the control circuit is manually reset by the operator by closing reset switch 115. It should be noted that even though the turning on of transistor Q, causes transistors Q Q, to turn off, transistorQ remains conducting.
  • a further safety device in the form of an electro-optic guard 121 is also included with the control circuit of the invention.
  • This safety device is directed primarily to protecting the operator should he inadvertently place his hand between the dies and close switch 116.
  • a plurality of photoresponsive elements such as photoconductors, are mounted on the base 12 of the support 18.
  • a light source for energizing these photoresponsive elements may be mounted on the underside of member 55 of support frame 18.
  • the resistance of a photoconductor varies inversel'y with the intensity of received light. Thus, when the light paths between a light source and the photoconductors are not interrupted, the resistance of each of the photoconductors is at its lowest value.
  • the photoconductors are coupled to an operational amplifier 0P forming a portion of the electro-optic guard circuit 121.
  • the photoconductors 53 noted individually by-PC, PC do not have their'impinging light interrupted, their resistances are at their lowest value and thus the output of OP 3 is at its lowest level.
  • the resistances of some of the photoconductors lPC PC increase thereby increasing the output of 0P
  • a sufficient number of photoconductors possess a high resistance the potential at the anode and gate of transistor 0,, assumes a predetermined relationship necessary for triggering 0,, into conduction.
  • transistor 0 When Q turns on, transistor 0 turns on thereby either preventing the driving circuit 104 from becoming activated or if previously activated, causing it to become deactivated. in this manner, should the operator place his hand in the vicinity of the die, he will interrupt the light to a suffi- 6 While the invention has been particularly shown and desscribed with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
  • a cyclically operated, magnetically actuated material working apparatus comprising a stationary housing, a first electromagnet affixed to said housing, a ram movable with respect to said housing, a second electromagnet afi'rxed to said ram and movable with said ram, said ram and said second electromagnet having a first position when said electromagnets are deenergized, said first and second electromagnets and said ram being positioned so that said first and second electromagnets are magnetically attracted towards each other when energized to impart a force to said ram to cause said ram to move along a predetermined path during each cycle of operation of said apparatus, a first die positioned at a first end of said ram, and a second die secured to said housing at a distance from said first die when said electromagnets are deenergized and in a position to close with said first die when said electromagnets are energized; a control means for controlling the characteristics of motion and force of said ram along said
  • control means constructed to respond to the position of said ram along a first portion of said predetermined path to maintain the force and velocity of movement of said ram at a predetermined low rate;
  • control means further constructed to respond to the position of said ram along a second portion of said predetermined path to create a progressively increasing attractive force between said first and second electromagnets as said ram moves said first die into close proximity to said second die;
  • control means further constructed to respond immediately to the attainment of a predetermined force upon the material, which is being worked and which is positioned between said first and second electromagnets, after contact of said first and second dies with said material to deenergize said electromagnets;
  • said housing comprises a work surface upon which is secured said second die' and in which said control means further comprises:
  • a plurality of light sensitive devices mounted upon said housingand a light source also mounted upon said housing;
  • said light sensitive devices and said light source being positioned to enable the interception of light between said light source and said light responsive devices by an object, such as a person's hand, placed upon said work surface to abort said cycle of operation and deenergize said electromagnetic means.
  • timing means responsive to the initiation of a cycle of operation of said apparatus to abort said cycle of operation if said cycle of operation is not completed in a predetermined interval of time.
  • said housing comprises a work surface upon which is secured said second die and in which said control means is constructed to cause said first portion of said predetermined path to be of a length to cause said first die to come into sufficiently close proximity to said work surface to make contact with small tools, such as screw drivers, which are present upon said work area surface, and to have the progress of said ram halted thereby.
  • a magnetically actuated material working apparatus comprising:
  • a ram means mounted in a given position on said housing and movable through a predetermined P a first die mounted on said housing;
  • a second die mounted on said ram means and positioned to close upon said first die when said ram means is moved through said predetermined path;
  • electromagnetic means constructed when energized to move said ram means along said predetermined path during each cycle of operation
  • control circuit means for controlling the characteristics of speed and force of said ram means as it moves along said predetermined path
  • control circuit means comprising a first control section constructed to restrain the average velocity and force of said ram means over a first portion of said predetermined path below predetermined levels;
  • control circuit means further comprising a second control section constructed to respond to the passing of said ram means past a certain point along said predetermined path to progressively increase the force imparted to said ram means by said electromagnetic means above said predetermined level to a degree sufficient to work said material;
  • control means further comprising a third control section constructed to respond to the attainment by said ram means of a predetermined maximum force in the direction of said predetermined path to deenergize said electromagnetic means;
  • said light sensitive devices and said light source being positioned to enable the interception of light between said light source and said light responsive de- 8.
  • said housing comprises a work surface upon which is secured said first die and in which said control circuit means is constructed to cause said first portion of said predetermined path to be of a length to cause said second die to come into sufficiently close proximity to said work surface to make contact with small tools, such as screw drivers, which are present upon said work area surface, and to have the progress of said ram means halted thereby.
  • a cyclically operated, magnetically actuated material working apparatus comprising a stationary housing, a first electromagnet affixed to said housing, a ram movable with respect to said housing, a second electromagnet afiixed to said ram and movable with said ram, said ram and said second electromagnet having a first position when said electromagnets are deenergized, said first and second electromagnets and said ram being positioned so that said first and second electromagnets are magnetically attracted towards each other when energized to impart a force to said ram to cause said ram to move along a predetermined path during each cycle of operation of said apparatus, a first die positioned at a first end of said ram, and a second die secured to said housing at a distance from said first die when said electromagnets are deenergized and in a position to close upon said first die when said electromagnets are energized; a method for controlling the characteristics of motion of said ram along said predetermined path to obtain
  • a magnetically actuated material working ap paratus comprising a housing, a ram means mounted in a given position on said housing and movable through a predetermined path, first and second dies mounted respectively on said housing and said ram means and positioned to close upon each other when said ram is moved through said predetermined path, and electromagnetic means constructed, when energized, to move said ram means along said predetermined path; a method for controlling the characteristics of speed and force of said ram means as it moves along said predetermined path by controlling energization of said electromagnetic means to obtain optimum working of said material and optimum safety for the human operator, and comprising the steps of:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Basic Packing Technique (AREA)
  • Electromagnets (AREA)
US00253039A 1972-05-15 1972-05-15 Control circuit for magnetic actuator Expired - Lifetime US3783662A (en)

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US25303972A 1972-05-15 1972-05-15

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JP (1) JPS5814147B2 (de)
AR (1) AR198987A1 (de)
AU (1) AU474070B2 (de)
BE (1) BE799449R (de)
BR (1) BR7303508D0 (de)
CA (1) CA988187A (de)
CH (1) CH561967A5 (de)
DE (1) DE2322513C2 (de)
ES (1) ES414717A1 (de)
FR (1) FR2184692B2 (de)
GB (1) GB1406920A (de)
IL (1) IL42083A (de)
IT (1) IT1045843B (de)
NL (2) NL170577B (de)
SE (1) SE377010B (de)
ZA (1) ZA732792B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246579A (ja) * 1984-05-19 1985-12-06 古河電気工業株式会社 電線端子圧着状態判別方法
US4593547A (en) * 1985-06-26 1986-06-10 Danly Machine Corporation Hydraulic overload control system for power presses
US4856186A (en) * 1988-11-04 1989-08-15 Amp Incorporated Apparatus and method for determination of crimp height
US4926677A (en) * 1987-12-03 1990-05-22 Kurt Waldner Die apparatus
EP0545638A1 (de) * 1991-12-06 1993-06-09 Gemcor Engineering Corp. Elektromagnetische Schwachstrom-Vorrichtung und Verfahren zum gleichmässigen Setzen von Nieten
US5471865A (en) * 1993-09-09 1995-12-05 Gemcor Engineering Corp. High energy impact riveting apparatus and method
US5502996A (en) * 1994-12-12 1996-04-02 The Whitaker Corporation Crimping press actuator assembly
WO1998002943A1 (en) * 1996-07-15 1998-01-22 The Whitaker Corporation Two stage press
WO1998012044A1 (en) * 1996-09-20 1998-03-26 The Whitaker Corporation Magnetic press
WO1998016371A1 (de) * 1996-10-12 1998-04-23 Telegärtner Gerätebau GmbH Sicherheitseinrichtung an umformmaschinen
EP1522398A1 (de) * 2003-10-08 2005-04-13 Saldoflex S.R.L. Antriebsvorrichtung für eine Heisssiegelbacke, insbesondere für Kunststoffbeutelherstellungsmachinen
FR2908739A1 (fr) * 2006-11-17 2008-05-23 Ora Sarl Machine d'operculage
CN102989924A (zh) * 2012-08-20 2013-03-27 苏州孚杰机械有限公司 摩擦压力机安全操作用磁性吸盘
EP2759396A1 (de) * 2010-12-16 2014-07-30 Multivac Sepp Haggenmüller GmbH & Co. KG Arbeitsstation für eine Verpackungsmaschine
US20170095855A1 (en) * 2015-12-14 2017-04-06 Rasoul Jelokhani Niaraki High-speed hydraulic forming of metal and non-metal sheets using electromagnetic fields
US10326235B2 (en) * 2017-04-18 2019-06-18 Facebook Technologies, Llc Electromagnetic connections for dynamically mating and un-mating a wired head-mounted display

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51107575A (ja) * 1975-03-19 1976-09-24 Tokyo Daigaku Taikokoirunyorudenjipuresu
US4056029A (en) * 1976-04-29 1977-11-01 Doherty Norman R Electrically actuated power press
DE3210566A1 (de) * 1982-03-23 1983-10-06 Aldo Artusi Verfahren zum bewegen eines an einem traeger festgelegten koerpers
JPS59223120A (ja) * 1983-06-02 1984-12-14 Riken Seikou Kk 自動金型
JPH0677876B2 (ja) * 1984-07-25 1994-10-05 株式会社日立製作所 電磁プレス装置
EP0184204A1 (de) * 1984-12-06 1986-06-11 Siemens Aktiengesellschaft Kraftregelung für Crimpmaschinen
DE3687251T2 (de) * 1985-09-20 1993-06-03 Molex Inc Vorrichtung zur herstellung eines elektrischen kabelbaumes.
CH671187A5 (en) * 1986-12-23 1989-08-15 Autophon Ascom Ag Sheet stamping machine - with electromagnetic drive made of piezoelectric stack controlled by a pulsed voltage
DE3842009C1 (de) * 1988-11-22 1990-03-22 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal, De
DE4014221A1 (de) * 1989-05-12 1990-11-15 Siemens Ag Verfahren und vorrichtung zur fertigungsueberwachung beim crimpen von flexiblen, abisolierten adern von leitungen
CN109332500B (zh) * 2018-08-17 2021-04-13 海宁立鹏电子科技有限公司 铆接冲压装置以及应用该装置的ptc发热条加工工艺
CN110789171B (zh) * 2019-11-11 2021-11-30 台州瑞祺工具股份有限公司 一种液压机压盘的外部防护清理装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787313A (en) * 1956-03-14 1957-04-02 Burndy Engineering Co Inc Connector installation control
US3099175A (en) * 1959-10-12 1963-07-30 Ivar S Lawson Power control for presses
US3206960A (en) * 1962-11-26 1965-09-21 Moxley Bloss George Safety device for presses
US3584496A (en) * 1968-05-03 1971-06-15 Amp Inc Magnetic actuator
US3665742A (en) * 1970-02-19 1972-05-30 Smith Corp A O Detecting missing or defective connectors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597559A (en) * 1949-07-18 1952-05-20 Bekey Andrew Electromagnetically operated mechanism using resonance effects
BE740701A (de) * 1968-10-31 1970-04-01

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787313A (en) * 1956-03-14 1957-04-02 Burndy Engineering Co Inc Connector installation control
US3099175A (en) * 1959-10-12 1963-07-30 Ivar S Lawson Power control for presses
US3206960A (en) * 1962-11-26 1965-09-21 Moxley Bloss George Safety device for presses
US3584496A (en) * 1968-05-03 1971-06-15 Amp Inc Magnetic actuator
US3665742A (en) * 1970-02-19 1972-05-30 Smith Corp A O Detecting missing or defective connectors

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246579A (ja) * 1984-05-19 1985-12-06 古河電気工業株式会社 電線端子圧着状態判別方法
JPH041479B2 (de) * 1984-05-19 1992-01-13 Furukawa Electric Co Ltd
US4593547A (en) * 1985-06-26 1986-06-10 Danly Machine Corporation Hydraulic overload control system for power presses
US4926677A (en) * 1987-12-03 1990-05-22 Kurt Waldner Die apparatus
US4856186A (en) * 1988-11-04 1989-08-15 Amp Incorporated Apparatus and method for determination of crimp height
EP0545638A1 (de) * 1991-12-06 1993-06-09 Gemcor Engineering Corp. Elektromagnetische Schwachstrom-Vorrichtung und Verfahren zum gleichmässigen Setzen von Nieten
US5471865A (en) * 1993-09-09 1995-12-05 Gemcor Engineering Corp. High energy impact riveting apparatus and method
US5575166A (en) * 1993-09-09 1996-11-19 Gemcor Engineering Corp. High energy impact riveting apparatus and method
US5502996A (en) * 1994-12-12 1996-04-02 The Whitaker Corporation Crimping press actuator assembly
WO1998002943A1 (en) * 1996-07-15 1998-01-22 The Whitaker Corporation Two stage press
US6192733B1 (en) 1996-07-16 2001-02-27 Alden Owen Long Two stage press
US5813274A (en) * 1996-09-20 1998-09-29 The Whitaker Corporation Magnetic press
US5974853A (en) * 1996-09-20 1999-11-02 The Whitaker Corporation Magnetic press
WO1998012044A1 (en) * 1996-09-20 1998-03-26 The Whitaker Corporation Magnetic press
WO1998016371A1 (de) * 1996-10-12 1998-04-23 Telegärtner Gerätebau GmbH Sicherheitseinrichtung an umformmaschinen
US6148985A (en) * 1996-10-12 2000-11-21 Telegaertner Geraetebau Gmbh Safety device on metal-forming machine tools
EP1522398A1 (de) * 2003-10-08 2005-04-13 Saldoflex S.R.L. Antriebsvorrichtung für eine Heisssiegelbacke, insbesondere für Kunststoffbeutelherstellungsmachinen
FR2908739A1 (fr) * 2006-11-17 2008-05-23 Ora Sarl Machine d'operculage
EP2759396A1 (de) * 2010-12-16 2014-07-30 Multivac Sepp Haggenmüller GmbH & Co. KG Arbeitsstation für eine Verpackungsmaschine
CN102989924A (zh) * 2012-08-20 2013-03-27 苏州孚杰机械有限公司 摩擦压力机安全操作用磁性吸盘
US20170095855A1 (en) * 2015-12-14 2017-04-06 Rasoul Jelokhani Niaraki High-speed hydraulic forming of metal and non-metal sheets using electromagnetic fields
US9821359B2 (en) * 2015-12-14 2017-11-21 Rasoul Jelokhani Niaraki High-speed hydraulic forming of metal and non-metal sheets using electromagnetic fields
US10326235B2 (en) * 2017-04-18 2019-06-18 Facebook Technologies, Llc Electromagnetic connections for dynamically mating and un-mating a wired head-mounted display

Also Published As

Publication number Publication date
GB1406920A (en) 1975-09-17
BE799449R (fr) 1973-11-12
AU5495973A (en) 1974-10-31
BR7303508D0 (pt) 1974-06-27
CH561967A5 (de) 1975-05-15
NL170577C (nl)
ES414717A1 (es) 1976-01-16
IT1045843B (it) 1980-06-10
JPS4956261A (de) 1974-05-31
DE2322513C2 (de) 1982-12-02
NL7306603A (de) 1973-11-19
AR198987A1 (es) 1974-07-31
JPS5814147B2 (ja) 1983-03-17
IL42083A (en) 1975-04-25
FR2184692A2 (de) 1973-12-28
AU474070B2 (en) 1976-07-15
DE2322513A1 (de) 1973-11-29
IL42083A0 (en) 1973-06-29
ZA732792B (en) 1974-04-24
CA988187A (en) 1976-04-27
NL170577B (nl) 1982-06-16
SE377010B (de) 1975-06-16
FR2184692B2 (de) 1977-02-11

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