US3716773A - Digital control device for strip metal feeder - Google Patents

Digital control device for strip metal feeder Download PDF

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Publication number
US3716773A
US3716773A US00150046A US3716773DA US3716773A US 3716773 A US3716773 A US 3716773A US 00150046 A US00150046 A US 00150046A US 3716773D A US3716773D A US 3716773DA US 3716773 A US3716773 A US 3716773A
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United States
Prior art keywords
strip metal
motor
wheel
advanced
relay
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Expired - Lifetime
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US00150046A
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English (en)
Inventor
A Raoul
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Individual
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/021—Control or correction devices in association with moving strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to predetermined lengths of webs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length

Definitions

  • strip metal usually steel
  • strip metal from which shapes are to-be cut by power presses is usually supplied in tightly wound coils and these coils are supported in cradles for unwinding.
  • the shaping or cutting operation must be done while the stripmetal is stationary and this means that the strip metal being uncoiled must be advanced a predetermined distance, then the cutting and/or shaping takes place, after which the strip is once again advanced a predetermined distance. If the strip does not advance sufficiently far, the piece formed is undersized and becomes a reject. On the other hand, if the strip advances too far, the piece formed may require trimming and this creates more wastage.
  • Another system involves the use of feed rollers driven by a motor with the motor being actuated for a predetermined length of time which is intended to be sufficient to advance the strip metal the desired distance. It must, of course, be appreciated that this strip metal is frequently very heavy so that a certain amount of momentum is generated during the forward advance and this makes it very difficult to stop the forward advance at a very precisely determined location.
  • a rotary transducer operatively connected to said wheel for generating electric pulse data proportional to the rotation of the wheel
  • an electronic counter with presets for counting electric pulses received from the transducer and stopping the feeder after a predetermined number of pulses have been received.
  • control device of the invention can be used with any type of strip metal feeder including the roller types driven by AC or DC motors as well as those powered by air or hydraulic cylinders. It is, however, particularly effective when used in combination with a strip metal feeder powered by a DC motor.
  • the measuring wheel will normally be a relatively narrow one, e.g., about 1% inches wide, and is mounted on an axle transverse to the direction of travel of the strip metal.
  • the axle is mounted in supports which can be held in pivotally mounted arms or mounted directly in sidewalls of the feeder positioned on each side of the strip metal. Since rotational movement of the wheel is actuated by movement of the strip metal, it is important that the measuring wheel assembly be either weighted or spring-loaded so as to provide at all times a positive engagement between the surface of the wheel and the strip metal. For instance, a loading of 40 pounds on the wheel provides a very positive contact on the metal.
  • lt is advantageous to provide an idler roller adjacent the measuring wheel for supporting the strip metal so that the idler roller and measuring wheel are pressing the strip metal therebetween. It is also advantageous to provide the peripheral surface of the measuring wheel with a gripping face to further decrease any tendency of slippage between the wheel and the strip metal.
  • the axle of the measuring wheel is directly connected to a rotary transducer for generating electric pulse data proportional to the rotation of the wheel.
  • a photo-electric transducer is particularly desirable since it can provide a very large number of electric pulses per rotation.
  • the electronic counter with presets is of known design and this counter receives the electric pulses from the transducer.
  • Such an electronic counter typically has a series of preset controls whereby a relayis activated after a predetermined number of electric pulses have been received.
  • the relay or relays of the electronic counter are operativelyfconnected to the drive means for the feeder and particularly when two series of preset controls and relays are used, the first set of controls and relay can be arranged to cause a slowing down of the feeder after a predetermined number of counts'and the second series of presets and relay arranged to cut off the feeder drive completely at a second predetermined count.
  • the electronic counter can then be provided with twp series of preset controls, each series having an individual control for units, tens, hundreds, thousands, and ten thousands. In other words the counter can be adjusted for a strip metal advancement of anywhere between 0.001 inch and 99.999 inches.
  • the electronic counter has a pair of output relays which are connected to the controls of a DC motor which drives the strip metal feeder. If the machine is to advance precisely 30.00 inches of strip metal, then the second series of preset controls will be set at 30.000 while the first series of preset controls are set at, for instance, 29.900. With this arrangement, when the metal strip feeder motor is turned on both the field and the armature windings of the motor will receive full voltage resulting in high acceleration up to the desired speed. The maximum speed will continue until the counter reads 29.900 at which time the first relay is activated and a resistor is put in the annature windings control. The reduced current in the armature causes the motor to quickly. decelerate to a preset slow speed.
  • the slow speed carries the strip forward the remaining 0.1 inch until the counter reads 30.000 at which time the second relay is activated causing a complete cut-off of current to the DC motor.
  • This programed slow-down provides the very unique and important advantage of being able to advance the strip metal at a maximumdesired speed for a substantial portion of its travel, then slowing the advance down and continuing the advance for a short distance at a greatly reduced speed. This makes it possible to stop the advancement precisely within a few thousandths of an inch and thus eliminate wastage.
  • the electronic counter also serves as a control center for the machine acting on the strip metal, e.g., a metal cutter or press.
  • the second relay of the electronic counter is activated, this also serves as the signal to activate the subsequent machine. It will be evident from this arrangement that the subsequent machine cannot operate "unless -a sufficient amount of strip metal has been supplied.
  • the electronic counter will normally include an automatic reset.
  • the cutter or press on completing its cycle trips a limit switch which actuates the counter reset whereby the counter resets to zero reading and is ready to count the advancement of thenext length of strip metal.
  • FIG. 1 is a perspective view showing the device of the invention in use with a strip metal feeder
  • FIG. 2 is an end elevation of the device
  • FIG. '3 is an elevation of the control panel.
  • a typical feeder device which is illustrated in FIG. 1 and has a pair of heavy steel plate sidewalls 10 forming a cradle for supporting a reel of strip metal 11. Mounted between these sidewalls are a pair of feed rollers 12 between which the strip metal 11a is pressed and advanced by rotation of the rollers. These feed rollers are mounted on axles l3 and driven by a DC motor 16 via reduction gear box 17 and pinions 15 mounted on the axles. Vertical pressure is applied to the feed 'rollers in the usual manner, e.g., by pneumatic cylinders.
  • the sidewalls 10 have end projections 20 and these are provided to support the control device of the invention.
  • a freely turning roller 21 is mounted between sidewall projections 20 directly beneath the strip metal 18.
  • cutouts 22 are provided in side projections 20 and within these cutouts are mounted vertically movable pillow blocks 23. These pillow blocks are spring biased in a downward direction by means of springs 24.
  • axle 25 is mounted in these pillow blocks and this axle supports a measuring wheel 26 which engagesthe top face of the strip metal 11a.
  • a photo-electric rotary transducer 27 for generating electric pulse data proportional to the rotation of the measuring wheel 26.
  • the transducer 27 There is a direct connection between the axle 25 and the transducer 27 so that the transducer will always directly respond to any rotational movement of axle 25 and measuring wheel 26.
  • a suitable transducer there may be mentioned a Dynapar Type Rotopulser Transducer.
  • An electronic counter 28 is mounted at a convenient location on one side extension 20 where it will be readily accessible to an operator.
  • This electronic counter can be of known type such as that produced by the Eagle Company of Toronto, Ontario and is connected to the transducer 27 by way of connection 29.
  • the electronic counter as illustrated has two series of preset control buttons 30 and 31.
  • Each control button has ten calibrations so that each can be preset between 0 and 9.
  • Each series of preset knobs 30 and 31 is arranged to activate 'a separate relay in the counter.
  • each series of preset buttons includes five separate buttons arranged for measuring units, tens, hundreds, thousands and ten thousands of electric pulses received from the transducer.
  • the counter 28 also includes a Nixie tube display 32 which gives a direct reading of the number of pulses that have been counted by the counter at an instance.
  • the counter 28 may also include a manual reset button 33 as well as the usual off-on switch 34.
  • This electronic counter has a typical terminal board with connections for the first and second relay outputs,
  • the outputs from the first and second relays are connected to the current controls for the DC motor 16 of the feeder and the details of such connections are not shown since they will be readily apparent to anyone skilled in the art and form no part of the invention.
  • One of the relay outputs is also connected to the drive mechanism for the subsequent machine such as cutter or press which is to act upon the strip metal 11a.
  • the cutter or press also can include a limit switch which is actuated by the machine on completing its cycle and this limit switch is operatively connected to the external reset terminal of the counter so that when the subsequent machine completes its cycle the counter 28 resets to a zero reading.
  • a device for automatically feeding predetermined lengths of strip metal to a metal processing-machine comprising:
  • a measuring wheel adapted to engage the strip metal being advanced whereby rotational movement of the wheel is actuated by movement of the strip metal
  • a rotary photoelectric transducer mechanically linked to said measuring wheel for generating pulse data proportional to the rotation of the wheel, and an electronic counter for counting electric pulses received from the transducer and controlling the drive motor, said counter having at least two output relays controlled by at least two series of preset controls, said relays being connected to power supplies to said motor drive whereby the motor initially receives a greater power supply to drive the rollers at a high speed, after the strip metal has advanced a predetermined distance the first relay is activated to cause a decrease in the power supplied to the motor thereby causing the motor to decelerate to a predetermined slower speed and after the strip metal has advanced at least a second preset distance at slow speed a further relay is activated causing a complete cut-off of power to the motor.
  • a device wherein a support roller is positioned beneath the measuring wheel for holding the strip metal in firm contact with the wheel.
  • a device according to claim 1 wherein the measuring wheel is spring biased against the strip metal.
  • a device according to claim 1 wherein the measur ing wheel is fixed to a freely rotatable axle which is also connected to the transducer.
  • a device according to claim 4 wherein the transducer is a photoelectric transducer.
  • a device wherein the electronic counter has two series of preset controls, each of said two presets activating a separate output relay.
  • a device calibrated to automatically advance lengths of strip metal between 0.001 inch and 99.929 ipch es.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Advancing Webs (AREA)
US00150046A 1971-06-04 1971-06-04 Digital control device for strip metal feeder Expired - Lifetime US3716773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15004671A 1971-06-04 1971-06-04

Publications (1)

Publication Number Publication Date
US3716773A true US3716773A (en) 1973-02-13

Family

ID=22532878

Family Applications (1)

Application Number Title Priority Date Filing Date
US00150046A Expired - Lifetime US3716773A (en) 1971-06-04 1971-06-04 Digital control device for strip metal feeder

Country Status (11)

Country Link
US (1) US3716773A (fr)
AR (1) AR193995A1 (fr)
BE (1) BE784375A (fr)
BR (1) BR7203551D0 (fr)
CA (1) CA934149A (fr)
DE (1) DE2226118A1 (fr)
FR (1) FR2140208B3 (fr)
GB (1) GB1396386A (fr)
IT (1) IT956128B (fr)
NL (1) NL7207417A (fr)
ZA (1) ZA723591B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577411A (en) * 1985-04-15 1986-03-25 Merrill David Martin Wheel for measuring horizontal traveling strip
US5941359A (en) * 1995-02-15 1999-08-24 Printe, Co., Ltd. Positioning apparatus
WO2024083731A1 (fr) * 2022-10-18 2024-04-25 TRUMPF Werkzeugmaschinen SE + Co. KG Agencement mécanique et procédé de traitement d'une bande de tôle déroulée d'une bobine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007492A1 (de) * 1980-02-28 1981-09-10 Hartmann & Lämmle GmbH & Co KG, 7255 Rutesheim Vorschubvorrichtung, insbesondere fuer den getakteten vorschub von stab- oder bandfoermigem material bei pressen, scheren o.dgl.
DE3042178C2 (de) * 1980-11-08 1983-12-01 Karl 8951 Lengenwang Egger Vorrichtung und Überwachung des Transportes eines Materialstranges
CN103466273B (zh) * 2013-09-26 2016-06-29 江苏尚诚精密模具科技有限公司 一种送料机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692361A (en) * 1950-05-24 1954-10-19 English Electric Co Ltd Control for motor operating flying shears
US2727570A (en) * 1949-09-12 1955-12-20 Marsh Stencil Machine Company Electrically actuated and controlled tape measuring and dispensing machine
US2767981A (en) * 1951-12-13 1956-10-23 Marsh Stencil Machine Company Push button control system for electrically actuated and controlled tape measuring and dispensing machines
US3195385A (en) * 1959-08-28 1965-07-20 Samuel M Langston Co Machine for processing linear material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2727570A (en) * 1949-09-12 1955-12-20 Marsh Stencil Machine Company Electrically actuated and controlled tape measuring and dispensing machine
US2692361A (en) * 1950-05-24 1954-10-19 English Electric Co Ltd Control for motor operating flying shears
US2767981A (en) * 1951-12-13 1956-10-23 Marsh Stencil Machine Company Push button control system for electrically actuated and controlled tape measuring and dispensing machines
US3195385A (en) * 1959-08-28 1965-07-20 Samuel M Langston Co Machine for processing linear material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577411A (en) * 1985-04-15 1986-03-25 Merrill David Martin Wheel for measuring horizontal traveling strip
US5941359A (en) * 1995-02-15 1999-08-24 Printe, Co., Ltd. Positioning apparatus
WO2024083731A1 (fr) * 2022-10-18 2024-04-25 TRUMPF Werkzeugmaschinen SE + Co. KG Agencement mécanique et procédé de traitement d'une bande de tôle déroulée d'une bobine

Also Published As

Publication number Publication date
GB1396386A (en) 1975-06-04
FR2140208B3 (fr) 1975-08-08
BE784375A (fr) 1972-10-02
CA934149A (en) 1973-09-25
IT956128B (it) 1973-10-10
BR7203551D0 (pt) 1973-06-14
FR2140208A1 (fr) 1973-01-12
DE2226118A1 (de) 1972-12-14
NL7207417A (fr) 1972-12-06
AR193995A1 (es) 1973-06-12
ZA723591B (en) 1973-03-28

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