US3906766A - Method for producing coil springs - Google Patents

Method for producing coil springs Download PDF

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Publication number
US3906766A
US3906766A US471422A US47142274A US3906766A US 3906766 A US3906766 A US 3906766A US 471422 A US471422 A US 471422A US 47142274 A US47142274 A US 47142274A US 3906766 A US3906766 A US 3906766A
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Prior art keywords
coil
pitch
diameter
coil spring
control circuit
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US471422A
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English (en)
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Takashi Sato
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Sato Spring Seisakusho KK
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Sato Spring Seisakusho KK
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Assigned to KABUSHIKI KAISHA SATO SPRING SEISAKUSHO reassignment KABUSHIKI KAISHA SATO SPRING SEISAKUSHO EXTRACT COPY FROM THE COMMERCIAL REGISTER, TOKYO, SHOWING CHANGE OF ADDRESS EFFECTIVE 9-14-79 Assignors: KABUSHIKI KAISHA SATO SPRING SEISAKUSHO 46-8, HIGASHI-KOMATSUGAWA 4 CHOME, EDOGAWA-KU, TOKYO, JAPAN
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • G05B19/21—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device
    • G05B19/25—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device for continuous-path control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms

Definitions

  • ABSTRACT In a method for producing coil springs, an electric pulse is generated for every predetermined length of wire fed through a wire feeding mechanism; a predetermined number of these pulses, which are adapted for the production of the shape and dimensions of a coil spring, are applied at a time also adapted for the formation of the shape and dimensions of the coil spring, to at least one of a pitch controlling circuit, a wire length controlling circuit, and a coil diameter controlling circuit all included in a control device; and the output of the control device is utilized for controlling at least one of a pitch forming device, a wire feeding device, and a coil diameter regulating device, and also a wire cutting device, whereby the shape and dimensions of the coil springs are controlled numerically.
  • This invention relates generally to the production of coil springs, and more particularly to a numerically controlled method for producing coil springs.
  • coil springs have been produced by machines of the type including a main shaft, the rotation of which is transmitted through cams and levers to feed rollers, a pitch-forming mechanism, a coil diameter controlling mechanism, a cutting mechanism, and the like.
  • each coil spring is ordinarily produced during one revolution of the main shaft, and for this reason, the number of turns of the feed roller is maintained as far as possible at a constant value during the one cyclic period of the production.
  • the mass of the wire material transported by the feed rollers and the tension applied to the wire material always vary during the feeding operation, and the above-mentioned slip between the feed roller and the wire thereby varies in a wide range.
  • Such variation in the amount of the slip constitutes a principal reason for the occurrence of wasteful products whose dimensions and characteristics cannot meet the application requirements.
  • cam and levers of various sizes and kinds must be prepared in the machine for producing various kinds of coil springs, and the presetting and adjustment of these cams and levers have required a considerable amount of labour and an extremely high level of skill.
  • Another object of the invention is to provide a method for producing coil springs wherein troublesome adjustments of cams and levers are entirely eliminated even in cases where the type and size of the coil springs to be produced therein are to be altered;
  • a novel method for producing coil springs comprising the steps of generating electric pulses of a number determined by the length of wire fed through a wire feeding mechanism, applying a certain number of these pulses at a certain time to at least one of a pitch control circuit, wire length control circuit, and a coil-diameter control circuit all included in a controlling device, the number of the pulses and the time of application thereof being so selected that a required shape and dimensions of the coil springs are thereby obtained, and utilizing the outputs of the control device for operating at least one of a pitch forming device, the wire feeding device, and a coil-diameter forming device, and also a cutting device, whereby the shape and dimensions of the coil springs are controlled in a numerical manner.
  • FIGS. 1(a) and 1(b) are a combination of a plan view of a coil spring producing machine and a block diagram of an example of a circuit of a control device for practicing the method according to the present invention
  • FIG. 2 is an elevational view of the coil spring producing machine shown in FIG. 1;
  • FIG. 3 is a side view of a cylindrical coil spring which has been produced by the machine shown in FIG. 1;
  • FIGS. 4(a) and 4(1)) are graphical diagrams indicating a sequence of operations of various parts of the control device with the length of the wire material being taken as the abscissa;
  • FIG. 5 is a side view of a coil spring-like product having a non-cylindrical configuration
  • FIGS. 6(a) and 6(b) are graphical diagrams indicating a sequence of operations of various parts of the control device with the length of the wire material taken as the abscissa;
  • FIGS. 7A through 7F are diagrams showing various outlines of coil springs and the like which can be produced by the coil spring production machine shown in FIGS. 1 and 2;
  • FIG. 8 is a circuit diagram of a part of the control device wherein the pulse motor is made manually rotatable.
  • FIGS. 1 and 2 showing a coil spring producing machine for practicing the method according to the present invention
  • a wire material 1 fed by a pair of wire-feeding rollers 2.
  • the wire material 1 (which is frequently called simply a wire) is then passed through a wire guide 3 to a coil forming position wherein the wire material is fabricated into a coiled spring by means of coiling pins 4 and 5.
  • An electric motor 6 is coupled through electromagnetic clutches 7 and 10 to a rotating shaft 8 and a crank shaft 11, respectively.
  • the clutch 7 When the clutch 7 is energized, the rotating shaft 8 is rotated by the electric motor 6, and a pair of feed rollers 2 are rotated by the shaft 8 through a pair of gear wheels 9.
  • the feed rollers 2 feed the wire material to the coil forming position in the coil spring producing machine.
  • the electromagnetic clutch 10 When the electromagnetic clutch 10 is energized, the torque of the electric motor 6 is transmitted to the crank shaft 11 for cutting the wire material 1 each time a coil spring is completed. More specifically, when the crank shaft 11 is rotated, a crank pin 12 provided at an end thereof moves a connecting rod 13, which in turn causes a sliding member 15 to be reciprocated along a sliding guide 14. The sliding member is provided with an upper cutting blade 16 which cooperates with a lower cutting blade 17 provided in the coiling position to cut the wire 1 each time the formation of a coil spring is completed. Electromagnetic brakes 18 and 19 are energized only while the electromagnetic clutches 7 and 10 are not energized, and the rotating shaft 8 and the crank shaft 11 are thereby maintained in the immobile condition.
  • a proximity switch 20 is provided adjacent to the crank shaft 1] and creates an output signal when a projection 21, made of a metal, of the crank shaft 11 is brought into the sensitive range of the same switch 20. The output thus produced is used for resetting the control device as will be hereinlater described in more detail.
  • a pitch forming device is provided with a pulse motor 22, the rotation thereof being transmitted through gear wheels 23 and 24 to a screw-threaded shaft 25.
  • a nut 26 engaging the shaft is combined with a rod 27 and a supporting member 28 for a pitch forming tool 29 in an integral manner.
  • the screw-threaded shaft 25 is rotated, and the pitch forming tool 29 is advanced or retracted along the longitudinal axis of the coil spring, so that a desired pitch is provided in the coil spring thus produced.
  • the coil spring producing machine is further provided with another pulse motor 30 which rotates another screw-threaded shaft 31.
  • the rotation of the screw-threaded shaft 31 causes a sliding member 32 formed integrally with a nut meshing with the screwthreaded shaft 31 to be reciprocated along a guide 33, and the coiling pin 4 provided at an end of the sliding member 32 thereby advances or retracts in the radial direction of the coil spring.
  • a lever 35 swingable around a pivot pin 34 is provided at a position adjacent to the sliding member 32, and a roller 36 provided on the sliding member 32 urges the lever 35 to swing around the pivot pin 34.
  • the swinging movement of the lever 35 in turn actuates another roller 37 on another sliding member 38, so that the latter reciprocates along another sliding guide 39, and the hereinbefore described coiling pin 5 provided at the tip of the sliding member 38 is also reciprocated in synchronism with the reciprocation of the coiling pin 4.
  • the forward and backward movements of the coiling pins 4 and 5 change the coil diameter of the coil spring to be produced.
  • a rotation converter 42 of a photoelectric type On a supporting bracket 41 secured to the structural framd of the machine, a rotation converter 42 of a photoelectric type is mounted, and a roller 44 for detecting the length of the wire 1 fed by the feed rollers is provided on the shaft 43 of the rotation converter 42.
  • a roller 47 cooperating with the detecting roller 44 is rotatably supported by a supporting member 46 slidable along a guide and is urged toward the detecting roller 44 by means of a spring 48, so that a suitable friction is maintained between the wire material 1 and the wire length detecting roller 44.
  • the resilience of the spring 48 can be adjusted to a suitable value by means of an adjusting screw 49 which can be further locked by the use of a locking nut 50.
  • the wire-length detecting roller 44 When the wire material 1 is fed into the coil spring producing machine, the wire-length detecting roller 44 is rotated, and the rotation is converted by the rotationconverter into electric pulses, the number of which is On the other hand, the rotation of the feed rollers requires a considerable torque for counteracting a force exerted on the wire material by the coiling pins 4 and 5 and another force for accelerating the wire material having a considerable mass. Because of the existence of the load torque, a considerable amount of slip is caused between the wire material 1 and the wire feed rollers.
  • the slip in the wire length detecting roller 44 is far less than that in the wire feed rollers 2, and the slip in the roller 44 can be minimized by adjusting the resilience of the spring 48 to a suitable value.
  • the number of pulses obtained from the wire length detecting roller 44 is exactly proportional to the length of the wire fed by the wire feeding rollers 2, and these pulses are applied to a control device for controlling the formation of coil springs in the coil spring producing machine.
  • Another proximity switch 51 is provided below the coil spring to be produced, and the position of the proximity switch 51 may also be adjusted in a suitable manner. When the axial length of the coil spring reaches a predetermined value, the proximity switch 51 produces an output pulse which is sent back to the control device as described in more detail hereinafter.
  • Another photoelectric rotation converter 52 is coupled directly to the output shaft of the pulse motor 22.
  • the rotation converter 52 detects the direction of the rotation and the rotated angle of the pulse motor 22, and the output of the converter 52 is sent to a reversible counter which will be hereinafter described with respect to the control device.
  • control device is generally divided into a pitch block I, a wire length control block II, and a coil diameter control block Ill.
  • Ganged switches SW1, SW2, and SW3 are included in the blocks l and II, and ganged selector switches SW4 and SW5 are provided in the block Ill.
  • the rotation converter 42 and the diameter of the detecting roller 44 are so designed that the rotation converter emits one electric pulse for every 0.01 mm of the wire material 1 fed through the detecting roller 44.
  • Preset counters la through 4a and 6a through are included in the control device, and these are all outputholding counters of a decimal type having two decimal places. Numerical values defining the shape and dimensions of the coil spring are preset directly in these preset counters.
  • preset counters 50, 11a, and 12a are automatically reset counters also of decimal type, and these are operated as pulse frequency dividers.
  • the operation of the coil-spring production machine will now be described with respect to an example thereof for producing a cylindrical coil spring as shown in FIG. 3.
  • the coil spring has a constant coil diameter of l0 mm, measured from center to center of the wire material, a total number of turns equal to 10, and a coil pitch equal to 2.5 mm.
  • Such a coil spring is of a most ordinary type having wide applications.
  • switches SW1, SW2, SW3, SW4, and SW5 are all in their positions A. Since the switches SW4 and SW5 are in the position A, no input is provided for a pulse-motor driving circuit 2b, and the coil diameter of the coil spring is not changed.
  • the coiling pins 4 and 5 are initially set to produce a coil diameter of mm.
  • the preset counters 1a, 2a, 3a, 4a, and 5a are preset to 31.41 mm, 251.25 mm, 314.16 mm, 31.50 mm, and 63, respectively. These preset values may be finely adjusted after a required number of test production runs so that accurate dimensions of the coil spring can be obtained.
  • the counter 5a Since the counter 5a is set at 63, it produces one output pulse for every 63 input pulses, and this output pulse is passed through and AND element AND 3 to a tool advancing circuit CCW in a pulse-motor driving circuit 1b.
  • the pulse motor 22 is thereby rotated in the counter-clockwise direction, as seen from the front of the machine, for a predetermined angle per each pulse applied to the pulse motor, and the screw-threaded shaft 25 is thereby rotated in the clockwise direction.
  • the pitch forming tool 29 is thus advanced for 0.05 mm per each pulse applied to the pulse motor.
  • the above described distance of advancing the pitch forming tool per each input pulse is determined by the rotating angle per one step of the pulse motor 22, gear ratio of the gear wheels 23 and 24, and the pitch of the screw 25.
  • the rotation converter 52 produces four output pulses which are then applied to terminal of the reversible counter RC.
  • the counter 4a Since the counter 4a is preset at 31.50 mm, the counter 4a produces one output pulse for every reception of 3,150 input pulses.
  • the output pulse is differentiated and introduced into .1 terminals of the flip-flop circuits FF2 and FF3, whereby the Q and Q outputs of these flip-flop circuits are brought into ON and OFF states, respectively.
  • the Q output of the flip-flop FF3 assumes the ON state
  • the output pulse, the leading edge thereof being differentiated is passed through an OR element 0R2 to the input terminal K of the flip-flop 1.
  • the Q output of the flip-flop 1 assumes the OFF state, and the AND element AND 1 is closed, whereby the input pulses are prevented from entering the counters 4a and 5a.
  • the AND element AND 3 is closed and AND 2 is opened.
  • the output of the counter 4a is passed through an ON-delay circuit OND and another differentiation circuit and sent back to the counter 4a for resetting the same.
  • the counter 5a Since 3,150 input pulses are applied to the counter 5a while the AND 1 is opened, the counter 5a produces 50 output pulses, whereby the pulse motor 22 is rotated for 50 steps.
  • the rotation of the pulse motor 22 causes the pitch forming tool 29 to advance through a distance of 0.05 mm X 50, that is 2.5 mm.
  • the rotation converter 52 generates altogether 200 pulses for this period, and the pulses are applied to terminal of the reversible counter RC. This stage corresponds to L in FIG. 4 and also to C in FIG. 3.
  • the wire material is fed continuously while the pitch forming tool 29 is held immobile at a 2.5-mm advanced position from the initial position, whereby the portion between the points c and d in FIG. 3 of the coil spring is formed into a constant pitch of 2.5 mm.
  • the counter 2a When the wire material of 251.25 mm length is fed to the coil spring producing machine, the counter 2a creates an output pulse, which is thereafter differentiated and applied through the switch SW1 and the OR element OR! to an input terminal J of the flip-flop FFl. The Q output of the flip-flop FFl is thus brought into the ON state, and the AND element ANDl is thereby opened.
  • the counters 4a and 5a thus start counting the input pulses, and the output of the counter 5a is applied through the AND element AND2 to an input CW of the pulse-motor driving circuit 16.
  • the pulse motor 22 is thus rotated in the clockwise direction.
  • the pitch forming tool 29 now starts to retract, and the rotation converter 52 is rotated in the clockwise direction.
  • the output of the rotation converter 52 is applied to terminal of the reversible counter RC wherein the input pulses are counted reversely (or subtracted). This stage corresponds to L in FIG. 4 and also to the point d in FIG. 3.
  • the pulse-motor 22 When the wire material of 282.75 mm length is fed through the detecting roller 44, the pulse-motor 22 is rotated for altogether 50 steps in the clockwise direction, whereby the pulse-motor 22 is brought back to its original position. Until that instant, the rotation converter 52 has applied altogether 200 pulses to the terminal of the reversible counter RC, and the counted result in the reversible counter RC is brought back to zero.
  • the reversible counter RC thus creates an output pulse, which is thereafter differentiated and applied through an OR element 0R2 to an input terminal K of the flip-flop FFl.
  • the Q output of the flip-flop FF is thus brought into OFF state, whereby the ANDl is closed, and the output of the counter 5a becomes zero.
  • the pulse-motor driving circuit lb stops its operation, and the pulse-motor 22 is thereby stopped. This instant corresponds to L, in FIG. 4 and also to e in FIG. 3.
  • the counter 3a When the wire material of 314.16 mm is sent through the detecting roller 44, the counter 3a produces an output pulse. This output is then amplified in an amplifier AMI and used for energizing the electromagnetic clutch l and the electromagnetic brake 18. The output of the counter 3a is further amplified in the reversed sense in another amplifier AM2, and the output thereof is used for energizing the electromagnetic clutch 7 and the electromagnetic brake 19.
  • the rotation of the feed rollers 2 is thus stopped, and the rotation of the crank shaft 11 is started. This instant corresponds to L in FIG. 4 and to the pointfin FIG. 3.
  • the rotation of the crank shaft 11 causes the upper blade 16 tp descend, whereby the coil spring just completed is cut off from the wire material.
  • the cutting device is so adjusted that the metal projection 21 on the crank shaft 11 enters in the sensitive range of the proximity switch when the upper blade 16 is approximately at the upper dead center of the cranking movement.
  • the output of the proximity switch 20 is thereafter differentiated and applied to all of the counters and flip-flops as their resetting signals.
  • the control device is thus set back to its initial state. This instant corresponds to L in FIG. 4 which is equal to L in the same FIGURE.
  • the crank shaft 11 is .then stopped, and the feed rollers 2 are again rotated.
  • the position L indicated in FIG. 4, which corresponds to the point b in FIG. 3, can be determined by a preset value in the preset counter 1a.
  • the position of the instants L and L in FIG. 4 can be determined by preset values in the counters 2a and 3a.
  • the length of the wire material fed between the instants L and L is determined by a preset value in the counter 4a.
  • the length of the wire material fed between the instants L and L is automatically equalized to the length of the wire material fed between the instants L and L by means of the rotation converter 52 and the reversible counter RC.
  • the variation rate of the pitch per unit length of the wire material in the period between L, and L or between L and L is determined by the preset value in the counter 5a.
  • the instant L in FIG. 4 is not determined by the output of the counter 2a, but is determined by the output of the proximity switch 51.
  • the position of the proximity switch 51 is so adjusted that it produces an output when the axial length of the coil spring is equal to a predetermined value.
  • the output of the proximity switch is thereafter differentiated, and applied through the switch SW1 and the OR element ORl to an input J of the flipflop FFl.
  • the Q output of the FFl is brought into ON state, and the AND element ANDl conducts.
  • the counter 5a starts producing output, and the formation of the coil end portion of the coil spring is thereby commenced.
  • the reversible counter RC creates an output, which is thereafter differentiated and applied to the input J of the flip-flop FF4.
  • the Q output thereof is brought into ON state, and an AND element AND4 is made conductive.
  • the input pulses from the rotation converter 42 are passed through the switch SW2, AND element AND4, and an OR element 0R3 to the counter 3a. This instant corresponds to L in FIG. 4.
  • the length of the wire material fed during the period between the instants L, and L is preset in the counter 3a.
  • the counter 3a produces an output
  • the feeding operation of the wire feeding rollers 2 is stopped, and the cutting operation begins.
  • the switches SW1, SW2, and SW3 are placed in their B positions, the length in the free state of the coil springs thus produced can be equalized regardless of the slightly different lengths of the wire material required for producing these coil springs and of the slight irregularities in the pitches.
  • control device particularly the third block thereof, will now be described for the case of producing a coiled article as shown in FIG. 5 wherein the coiling diameter is varied.
  • This article is used for an end tool of a pipe cleaner. It is assumed that the production of the article is started from the left end. In this case also, the pitch controlling block I of the control device operates in a similar manner as in the above described case, and hence detailed description thereof will not be repeated.
  • the switches SW1, SW2, and SW3 are placed in their positions A, and the switches SW4 and SW5 are placed in their positions B.
  • values 1,020 mm, 560 mm, 120 mm, 670 mm, 850 mm, 1,030 mm, and 20 are preset, respectively.
  • the output of the counter 10a is not necessary, so that the above described value preset in the counter 10a is selected at an arbitrary value greater than the preset value in the counter 3a.
  • the AND element AND6 is brought into the conductive state, and the input pulses are allowed to enter the counter 120. Since a value 20 is preset in the counter 12a, the latter produces an output pulse upon reception of every 20 input pulses. Furthermore, the 6 output of the flip-flop FFS is in the ON state, the output of the coutner 12a is passed through 0R7, AND8, and SW5 to the tool retracting terminal CCW of the pulse-motor control circuit 2b.
  • the pulsemotor 30 is thus rotated counter-clockwisely as seen from the side of the output shaft, whereby the sliding member 32 integrally combined with the nut is retracted.
  • the coiling pins 4 and 5 are thereby retracted, and the coil diameter thus formed is enlarged.
  • the coiling pin 4 is advanced or retracted by 0.01 mm with respect to the rotation of the pulse-motor 30 for one step, and the coiling pin 5 is thereby advanced or retracted by one third of the above-mentioned value.
  • the counter 12a While a wire material of 120 mm is fed through the detecting roller 44, and 12,000 pulses are sent out of the rotation converter 42, the counter 12a emits 600 pulses to the pulse-motor control circuit 2b, whereby the coiling pin 4 is retracted by 6 mm.
  • the counter 7a produces an output which is thereafter differentiated and passed through an OR element R4 to the input terminal T of the flip-flop FF6.
  • the outputs Q and 6 of the flip-flop FF6 are thereby brought into the ON and OFF states, respectively.
  • AND elements AND6 and ANDS are thus closed and opened, respectively, and the input pulses are introduced into the counter 11a. This instant corresponds to L in FIG. 6 and also to a point b in FIG. 5.
  • wire material of 440 mm is fed through the detecting roller 44, and the counter 11a receives 44,000 input pulses.
  • the counter 11a delivers 400 output pulses and the coiling pin 4 is retracted by 4 mm.
  • the counter 6a delivers one output pulse,and the output pulse is thereafter differentiated and sent to an input terminal J of the flip-flop FFS.
  • the Q and O outputs of the flip-flop are thereby brought into ON and OFF states, respectively, whereby AND8 is closed and AND7 is opened.
  • the output from the counter 1 1a is passed through 0R6, AN7, and SW4 to an input terminal CW of the pulse-motor driving circuit 2b.
  • the coiling pins 4 and 5 now start moving forwardly, whereby the coil diameter starts decrease. This instant corresponds to L in FIG. 6 and also to a point c in FIG. 5.
  • the wire material of l mm is further supplied, and hence the counter 110, receives 11,000 input pulses and delivers 100 output pulses, thus advancing the coiling pin 4 through 1 mm.
  • the counter 8 When altogether 670 mm of the wire material is supplied to the machine after the initiation of the coiling operation, the counter 8:: produces an output which is thereafter differentiated and passed through 0R4 to the input terminal T of the flip-flop FF6.
  • the Q and O outputs of the flip-flop FF6 are brought into OFF and ON state, respectively, and ANDS is closed and AND6 is opened.
  • Input pulses are again counted in the counter 12a, and the ratio of the coil-diameter variation against the supplied length of the wire material is again increased. This instant corresponds to L in FIG. 6 and also to a point d in FIG. 5.
  • the counter 120 receives 18.000 input pulses.
  • the counter 12a thus delivers 900 output pulses, and the coiling pin 4 is further advanced by 9 mm.
  • the counter 30 When altogether 1,020 mm of the wire material is supplied to the machine, the counter 30 produces an output, and the electromagnetic clutch 7 is brought into the OFF state, while the electromagnetic clutch 10 is brought into the ON state. Thus, the feeding of the wire material is stopped 'and a cutting operation is started. This instant corresponds to L in FIG. 6 and also to fin FIG. 5. After the cutting operation, an article adapted to be used at the end of a pipe cleaner is obtained.
  • the output is thereafter differentiated and sent for resetting all of the counters and the flip-flops.
  • the feed rollers now start rotating. This instant corresponds to L which is the same as L in FIG. 6.
  • the counter 10a is reset before the preset number of input pulses are counted in the counter 10a, whereby no output is delivered therefrom.
  • FIG. 7 there are indicated, by envelopes, various types of coiled articles which can be produced in accordance with the present invention. Assuming that the coiling operation of each coiled body is started from the leftward end thereof, the coiled bodies A, B, and F in FIG. 7 are produced by placing the switches SW4 and SW5 in their positions C, and the coiled bodies C, D, and E are produced by placing the switches in their positions B.
  • the time instant at which the rotating direction of the pulse-motor 30 is reversed is determined by the preset value of the counter 6a. Furthermore, the changing instant of the rate of the coil-diameter variation relative to the fed length of the wire material is determined by the preset values in the counters 7a and 8a, and the rate itself is determined by the preset values in the counters 11a and 12a. The starting and ending positions of the portion wherein the coil diameter is not changed are determined by the preset values in the counters 9a and 10a.
  • the pitch forming tool and the coiling pins must be returned exactly to their original positions after the formation of each product.
  • the pulse-motors 22 and 30 must be returned exactly to their original positions after the completion of each product. If the returning of the pulse-motors to their original positions should fail, all of the subsequent products will have dimensions deviating from the required values and hence will be wasted. Since the pulse-motor used for the pitch forming tool is required to be rotated at a considerably high pulse frequency, there is a high possibility of pulsemiss failing to follow the high pulse frequency.
  • a position detecting device is provided on the output shaft of the pulse-motor, on an end portion of the screwthreaded shaft, or on the linear movement portion driven by the screw-threaded shaft, whereby the actual movement thereof is detected.
  • the output signal from the position detecting device is fed back to the control device, and the difference between a preset numerical value and the position detected signal is utilized for compensating for the error of the pulse-motor.
  • an inductive type, magnetic type, capacitive type, or a photoelectric type position detecting device such as a synchro resolver, inductosyn, magnetoscale, capacitive scale, optical coded plate, or a diffraction grating may be used.
  • the circuit may be so composed that the signal indicative of the retraction of the pulse-motor 22 to the original position is issued from the reversible counter RC which adds or subtracts the output pulses from the rotation converter 52 to or from the already counted value.
  • a third countermeasure for preventing pulse-miss a procedure for varying the rotational speed of the feed rollers 2 may be recommended.
  • one pulse-motor 22, which is easily subject to pulsemiss is operated during short periods of from L to L and from L to L For this reason, if the mechanism is so constructed that the wire material is fed at a lower speed during these periods, with the pulse-motor 22 being driven at a lower pulse frequency, the possibility of causing pulse-miss can be substantially eliminated.
  • the feed rollers have been operated at a slower speed in the periods of from L, to L and from L to L and at a higher speed in the period of from L to L
  • This can be realized, for instance, by providing the shaft 8 in FIG. 1 with one more electromagnetic clutch for the low speed operation, and this clutch and the existing clutch 7 may be operated in an alternate manner at the instants of, for instance, L and L
  • the object may be achieved by the use of a motor 6 of a a, 2, type and changing the motor speed at the instants of L and L
  • the production efficiency can be elevated by operating the feed rollers at a high speed as described above, during the period from L to L In FIG.
  • the pulse-motor When the switch SW2a is depressed several times, the pulse-motor is rotated in the clockwise direction by a corresponding number of steps.
  • the switch SW2a operates as a stepped movement switch
  • the switch SW3a operates as a jog switch to control the pulse-motor.
  • the manual control device for the pulse-motor may be utilized advantageously for properly adjusting the initial tension thereof.
  • a pitch control block I, a wire length control block II, and a coil diameter control block III are provided in the control device as described above, it is of course possible that one or two blocks thereof be omitted when it is so desired. It the coil diameter control block III is omitted, a machine specifically adapted to produce a cylindrical coiled spring as shown in FIG. 3 can be obtained. It the pitch control block I is omitted, a machine specifically adapted to produce a constant pitch coil spring can be obtained. Furthermore, when the pitch control block I and the coil diameter control block III are both omitted, a machine specifically adapted to produce a coil spring wherein both of the pitch and the coil diameter are maintained constant can be obtained. The latter type machine is extremely advantageous for producing a tension spring having closely contacting coil turns.
  • electrohydraulic pulse-motors or a combination of a d, c, motor and a position detecting device may also be utilized for driving these tools.
  • a rotation converter of induction type, magnetic type, or a capacitive type may also be utilized for acquiring the substantially same effects.
  • a contact type switch may be employed, and instead of the above described pushout type pitchforming tool, a wedge type pitch-forming tool may also be utilized.
  • An improved method for producing coil springs in which an electrical pulse is generated each time a predetermined length of wire material is fed through a wire feeding mechanism, a number of said pulses being applied to a wire length control circuit included in a control device, and the output of said wire length control circuit emitted at the time a predetermined number of said pulses are applied to said circuit is utilized for stopping the movement of the wire feeding device and for starting the movement of a cutting device, wherein said improvement comprises the steps of:
  • phase output pulses of said coil-diameter control circuit are emitted for a period during which a coildiameter increasing portion of the coil spring is produced, said phase output pulses of said coil-diameter control circuit being utilized for retracting the coildiameter forming pin a predetermined distance per each of said output pulses of said coil-diameter control circuit, whereby a required coil-diameter increase is obtained in the coil spring; and wherein the emission of output pulses from said coil-diameter control circuit is suspended for a period during which a constant coildiameter portion of the coil spring is produced, whereby said coil-diameter forming pin is so securely held that coil-diameters of the constant coil-diameter portion of the coil spring are reliably uniform; and wherein opposite phase output pulses of said coildiameter control circuit are emitted
  • a method as set forth in claim 1 in which the attainment of a predetermined axial length of the coil spring is detected by a position detector during production of the constant pitch portion without emitting output pulses of said pitch control circuit, thereby starting the emission of opposite phase output pulses of said pitch control circuit at the instant of said detection, whereby the retraction of said pitch forming tool is started, and the formation of a coil end portion having a closely adjacent turn of the coil is thereby commenced, whereby an accurate axial free length of the coil spring is obtained each and every time a coil spring is produced.
  • a method as set forth in claim 2 in which displacements of the pitch forming tool means and coildiameter forming pin means are detected respectively by position detecting devices provided respectively on a part driven by a feeding screw of each of said devices, and the outputs of said position detecting devices are fed back to said pitch and coil-diameter control circuits and respectively compared therein with numerical signals obtained from said control circuits, the rotations of motors for driving said devices being corrected by respective differences obtained by said comparison, whereby exact reciprocating movements of said pitch forming tool means and said coil-diameter forming pin means between respective predetermined positions are secured.
  • a method as set forth in claim 2 wherein displacements of pitch forming tool means and coil-diameter forming pin means are detected respectively by position detecting devices provided respectively on a part of a feeding screw of each of said devices, and the outputs of said position detecting devices are fed back to said pitch and coil-diameter control circuits and respectively compared therein with numerical signals obtained from said control circuits, the rotations of said driving motors being corrected by respective differences obtained by said comparison, whereby exact reciprocating movements of said pitch forming tool means and said coil-diameter forming pin means between respective predetermined positions are secured.
  • position detecting devices are respectively provided on a part driven by a feeding screw of each of said pitch forming device and coil-diameter forming device, an output being generated from each of said position detecting devices when the corresponding driving motor is reversely rotated to its original position, and a logic gate in the motor controlling circuit in said control device is closed by said output from said position detecting device thereby to stop the rotation of said motor, whereby returning of the pitch forming tool and the coildiameter forming pin to the predetermined positions is assured each time the production of one coil spring is completed.
  • position detecting devices are respectively provided on a part of a feeding screw of each of said pitch forming device and coil-diameter forming device, an output being generated from each of said position detecting devices when the corresponding driving motor is reversely rotated to its original position, and a logic gate in the motor controlling circuit in said control device is closed by said output from said position detecting device thereby to stop the rotation of said motor, whereby returning of the pitch forming tool and the coildiameter forming pin to the predetermined positions is assured each time the production of one coil spring is completed.
  • a method as set forth is claim 1 in which by varying the speed of a motor for driving the wire feed mechanism, the wire material is fed at a low speed during the formation of the coil end portions, and the wire material is fed at a high speed when the middle portion of the coil spring is formed wherein the coil pitch is maintained at a constant value.
  • a method as set forth in claim 1 wherein a stepmovement switch is provided in said pitch control circuit included in said control device for operating a motor in such a manner that each time the stepmovement switch is depressed, the motor is rotated in a desired direction through a predetermined angle to drive the pitch forming tool in the corresponding direction through a predetermined distance, whereby the positional adjustment of said pitch forming tool is greatly facilitated.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
US471422A 1973-07-26 1974-05-20 Method for producing coil springs Expired - Lifetime US3906766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8362273A JPS5339014B2 (de) 1973-07-26 1973-07-26

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US (1) US3906766A (de)
JP (1) JPS5339014B2 (de)
CH (1) CH576822A5 (de)
DE (1) DE2435482C2 (de)
FR (1) FR2238546B1 (de)
GB (1) GB1463595A (de)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018070A (en) * 1975-09-30 1977-04-19 Torin Corporation Electro-mechanical drive for torsion winders and the like
US4030327A (en) * 1976-06-16 1977-06-21 Torin Corporation Spring coiling machine with improved drive means
DE2715740A1 (de) * 1976-04-07 1977-10-13 Nhk Spring Co Ltd Numerisch gesteuerte vorrichtung zur herstellung einer spiralfeder
US4132094A (en) * 1976-07-09 1979-01-02 Missioux Jean L Machine for forming helicoidal springs
US4177662A (en) * 1977-01-03 1979-12-11 Heinz Vogel Machine for the manufacture of axially prestressed coils from strip
US4289004A (en) * 1979-02-19 1981-09-15 Kabushiki Kaisha Itaya Seisaku Sho Coil spring manufacturing machine
US4362038A (en) * 1979-09-19 1982-12-07 Keihin Hatsujyo Company Limited Wire forming apparatus for torsion springs
US4372141A (en) * 1980-10-27 1983-02-08 Sleeper & Hartley Corp. Wire coiling machine
US4520644A (en) * 1981-01-14 1985-06-04 Torin Corporation Spring coiling machine with improved cut-off means
US4594869A (en) * 1983-07-15 1986-06-17 Mec Machinery Co., Ltd. Method and apparatus of manufacturing a coil spring
US4622839A (en) * 1985-01-11 1986-11-18 France Bed Co., Ltd. Apparatus for manufacturing spring unit
US4713956A (en) * 1983-07-04 1987-12-22 France Bed Co., Ltd. Apparatus for manufacturing spring units
DE3804913A1 (de) * 1987-02-20 1988-09-01 Itaya Seisakusho Vorrichtung und verfahren zur herstellung von federn
US4823576A (en) * 1986-10-20 1989-04-25 Toyoda Gosei Co., Ltd. Apparatus for manufacturing ring-shaped member from elongate workpiece
US4873854A (en) * 1987-10-30 1989-10-17 Sleeper & Hartley Corp. Computer controlled coiling machine
EP0338153A1 (de) * 1988-04-21 1989-10-25 Norio Matsuura Vorrichtung zur Herstellung von Federn
US4934165A (en) * 1988-10-17 1990-06-19 Sleeper & Hartley Corp. Computer controlled coiling machine
US5117668A (en) * 1988-10-17 1992-06-02 Sleeper & Hartley Corp. Computer controlled coiling machine
US5285669A (en) * 1993-01-27 1994-02-15 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus and spring cutting mechanism
US5452598A (en) * 1993-07-26 1995-09-26 Minyu Machinery Corp., Ltd. Automatic spring formation apparatus
US5454249A (en) * 1992-06-19 1995-10-03 Reell Precision Manufacturing Corporation Spring toe forming device and method
US5477715A (en) * 1992-04-08 1995-12-26 Reell Precision Manufacturing Corporation Adaptive spring winding device and method
US5713115A (en) * 1995-05-11 1998-02-03 Spuehl Ag Electronically regulated apparatus for coiling springs
US5950473A (en) * 1997-08-29 1999-09-14 Frank L. Wells Company Coil spring forming and conveying assembly
US6142002A (en) * 1998-08-21 2000-11-07 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus and tool selection apparatus
EP1052920A1 (de) * 1997-11-13 2000-11-22 L&P PROPERTY MANAGEMENT COMPANY Federkern und verfahren zu seiner herstellung
US6151942A (en) * 1998-08-21 2000-11-28 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus
US6318416B1 (en) 1997-11-13 2001-11-20 L&P Property Management Company Spring interior and method of making same
EP1199118A2 (de) * 2000-10-19 2002-04-24 Chuo Hatsujo Kabushiki Kaisha Verfahren und Vorrichtung zur Herstellung einer Schraubenfeder
US6430982B2 (en) 1997-08-29 2002-08-13 Michael E. Andrea Coil spring forming and conveying assembly
US20030158620A1 (en) * 2002-02-21 2003-08-21 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
CN103433747A (zh) * 2013-08-20 2013-12-11 上海冈茨电磁线圈有限公司 一种刮头断料机
US10472695B1 (en) * 2010-07-19 2019-11-12 Barnes Group Inc. Induction heating of spring

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Publication number Priority date Publication date Assignee Title
US4026135A (en) * 1975-05-14 1977-05-31 Torin Corporation Spring coiling machine with auxiliary drive and control
US4018071A (en) * 1975-10-09 1977-04-19 Torin Corporation Spring winding machine with improved pitch mechanism
JPS5376159A (en) * 1976-12-18 1978-07-06 Nhk Spring Co Ltd Nc coil spring manufacturing device
JPS54123566A (en) * 1978-03-20 1979-09-25 Itaya Seisakusho Coil spring producing apparatus
JPS5725233A (en) * 1980-07-18 1982-02-10 Nhk Spring Co Ltd Formation of coil spring
JPS58112623A (ja) * 1981-12-25 1983-07-05 Shinko Kikai Kogyo Kk ばね製造機の調整方法
WO1996038240A1 (en) * 1995-05-31 1996-12-05 Afcol Manufacturing Limited Methods and means for forming spring coils

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US3433041A (en) * 1966-10-10 1969-03-18 Torrington Mfg Co Spring winding machine
US3470721A (en) * 1967-01-03 1969-10-07 Moog Industries Inc Coil spring winding machine
US3641794A (en) * 1970-01-26 1972-02-15 Sam J Carrozza Monitoring system for a helical coil spring winder and method

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US2779407A (en) * 1954-12-23 1957-01-29 Robotron Corp Method and apparatus for forming a spring of predetermined length from coil spring stock
US2923343A (en) * 1957-01-28 1960-02-02 Torrington Mfg Co Length measuring and cutting means for spring coiling machine provided with two selectively useable drive mechanisms for the feed rolls
DE1752535A1 (de) * 1968-06-11 1971-06-03 Industrifjaedrar Ab Kontroll- und Regelvorrichtung
DE1752891C3 (de) * 1968-07-31 1975-02-27 Hoesch Werke Ag, 4600 Dortmund Wickelmaschine für Schraubenfedern

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Publication number Priority date Publication date Assignee Title
US3433041A (en) * 1966-10-10 1969-03-18 Torrington Mfg Co Spring winding machine
US3470721A (en) * 1967-01-03 1969-10-07 Moog Industries Inc Coil spring winding machine
US3641794A (en) * 1970-01-26 1972-02-15 Sam J Carrozza Monitoring system for a helical coil spring winder and method

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018070A (en) * 1975-09-30 1977-04-19 Torin Corporation Electro-mechanical drive for torsion winders and the like
DE2715740A1 (de) * 1976-04-07 1977-10-13 Nhk Spring Co Ltd Numerisch gesteuerte vorrichtung zur herstellung einer spiralfeder
US4112721A (en) * 1976-04-07 1978-09-12 Nhk Spring Co., Ltd. Nc coil spring manufacturing apparatus
US4030327A (en) * 1976-06-16 1977-06-21 Torin Corporation Spring coiling machine with improved drive means
US4132094A (en) * 1976-07-09 1979-01-02 Missioux Jean L Machine for forming helicoidal springs
US4177662A (en) * 1977-01-03 1979-12-11 Heinz Vogel Machine for the manufacture of axially prestressed coils from strip
US4289004A (en) * 1979-02-19 1981-09-15 Kabushiki Kaisha Itaya Seisaku Sho Coil spring manufacturing machine
US4362038A (en) * 1979-09-19 1982-12-07 Keihin Hatsujyo Company Limited Wire forming apparatus for torsion springs
US4372141A (en) * 1980-10-27 1983-02-08 Sleeper & Hartley Corp. Wire coiling machine
US4520644A (en) * 1981-01-14 1985-06-04 Torin Corporation Spring coiling machine with improved cut-off means
US4713956A (en) * 1983-07-04 1987-12-22 France Bed Co., Ltd. Apparatus for manufacturing spring units
US4594869A (en) * 1983-07-15 1986-06-17 Mec Machinery Co., Ltd. Method and apparatus of manufacturing a coil spring
US4622839A (en) * 1985-01-11 1986-11-18 France Bed Co., Ltd. Apparatus for manufacturing spring unit
US4823576A (en) * 1986-10-20 1989-04-25 Toyoda Gosei Co., Ltd. Apparatus for manufacturing ring-shaped member from elongate workpiece
DE3804913A1 (de) * 1987-02-20 1988-09-01 Itaya Seisakusho Vorrichtung und verfahren zur herstellung von federn
US4991277A (en) * 1987-02-20 1991-02-12 Kabushiki Kaisha Itaya Seisaku Sho System for manufacturing springs
US4873854A (en) * 1987-10-30 1989-10-17 Sleeper & Hartley Corp. Computer controlled coiling machine
EP0338153A1 (de) * 1988-04-21 1989-10-25 Norio Matsuura Vorrichtung zur Herstellung von Federn
US4934165A (en) * 1988-10-17 1990-06-19 Sleeper & Hartley Corp. Computer controlled coiling machine
US5117668A (en) * 1988-10-17 1992-06-02 Sleeper & Hartley Corp. Computer controlled coiling machine
US5477715A (en) * 1992-04-08 1995-12-26 Reell Precision Manufacturing Corporation Adaptive spring winding device and method
US5454249A (en) * 1992-06-19 1995-10-03 Reell Precision Manufacturing Corporation Spring toe forming device and method
US5285669A (en) * 1993-01-27 1994-02-15 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus and spring cutting mechanism
DE4323296A1 (de) * 1993-01-27 1994-07-28 Itaya Seisakusho Federherstellungsgerät und Federschneidvorrichtung
DE4323296C2 (de) * 1993-01-27 2003-04-10 Itaya Seisaku Sho Tokio Tokyo Vorrichtung zur Herstellung von Federn mit abgeflachten Enden
US5452598A (en) * 1993-07-26 1995-09-26 Minyu Machinery Corp., Ltd. Automatic spring formation apparatus
US5713115A (en) * 1995-05-11 1998-02-03 Spuehl Ag Electronically regulated apparatus for coiling springs
US5950473A (en) * 1997-08-29 1999-09-14 Frank L. Wells Company Coil spring forming and conveying assembly
US6430982B2 (en) 1997-08-29 2002-08-13 Michael E. Andrea Coil spring forming and conveying assembly
US6318416B1 (en) 1997-11-13 2001-11-20 L&P Property Management Company Spring interior and method of making same
EP1052920A4 (de) * 1997-11-13 2001-01-10 L & P Property Management Co Federkern und verfahren zu seiner herstellung
EP1052920A1 (de) * 1997-11-13 2000-11-22 L&P PROPERTY MANAGEMENT COMPANY Federkern und verfahren zu seiner herstellung
US6151942A (en) * 1998-08-21 2000-11-28 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus
US6142002A (en) * 1998-08-21 2000-11-07 Kabushiki Kaisha Itaya Seisaku Sho Spring manufacturing apparatus and tool selection apparatus
EP1199118A2 (de) * 2000-10-19 2002-04-24 Chuo Hatsujo Kabushiki Kaisha Verfahren und Vorrichtung zur Herstellung einer Schraubenfeder
EP1199118A3 (de) * 2000-10-19 2002-11-20 Chuo Hatsujo Kabushiki Kaisha Verfahren und Vorrichtung zur Herstellung einer Schraubenfeder
US6648996B2 (en) 2000-10-19 2003-11-18 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US20030158620A1 (en) * 2002-02-21 2003-08-21 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US6836964B2 (en) 2002-02-21 2005-01-04 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US10472695B1 (en) * 2010-07-19 2019-11-12 Barnes Group Inc. Induction heating of spring
CN103433747A (zh) * 2013-08-20 2013-12-11 上海冈茨电磁线圈有限公司 一种刮头断料机

Also Published As

Publication number Publication date
FR2238546A1 (de) 1975-02-21
FR2238546B1 (de) 1980-03-21
DE2435482A1 (de) 1975-02-06
GB1463595A (en) 1977-02-02
DE2435482C2 (de) 1986-07-24
CH576822A5 (de) 1976-06-30
JPS5339014B2 (de) 1978-10-19
JPS5033163A (de) 1975-03-31

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