US2296488A - Winding device for punched strip stock - Google Patents

Description

Sept..22, 1942. w. M. ANDERSON I 2,296,438

WINDING DEVICE FOR PUNCHED STRIP STOCK Filed Oct. 23, 1940 V s Sheets-Sheeb 2 MAW Sept. 22, 1942. w. M. ANDERSON 2,

WINDING DEVICE FOR PUNCHED STRIP STOCK Filed Oct. 23, 1940 5 SheetS -Sheet 1 120622207 WFlliam M Anderson P 1.942- w. M. ANDERSON 2,296,488

WINDING DEVICEFOR PUNCHED STRIP STOCK Filed on. 23, 1940 :s Sheets-Sheet s 121mm Z'or W122 am M Anderson Patented Sept. 22, 1942 WINDING DEVICE FOR PUNCHED' STRIP STOCK William M. Anderson, Minneapolis, Minn., assignor to said Anderson and F. J. Kerner, both of Minneapolis, Minn., a co-partnership Application October 23, 1940, Serial No. 362,374

1 Claim.

My present invention provides a simple and highly efficient device for the winding of punched strip stock and, generally stated, consists of the novel devices, combinations of devices and arrangements of parts hereinafter described and defined in the claim.

The term strip stock as usually referred to in the trade designates long ribbon-like metal strips such as frequently employed in connection with punch presses. These strip stocks or metallic ribbons are usually quite thin and quite flexible and generally come to the trade wound on reels or large spools from which they are delivered to the punch press. These punch presses usually have their own intermittently acting and properly timed feed mechanism that feed the strip stock from the supply reel to the punch mechanism.

My invention makes it practicable to rewind the punched strip or ribbon onto a motor-driven receiving reel. In accomplishing this result, however, it is of very great importance that there be maintained a certain amount of slack in the ribbon between the punching mechanism and the rewinding reel so that there will be no undue strains put upon the punched ribbon. My invention provides extremely simple and highly efficient means for accomplishing this result.

In the accompanying drawings my invention is illustrated in connection with a punch press of the self-feeding punch reciprocating type.

Referring to the drawings wherein like characters indicate like parts throughout the several views:

Fig. 1 is a view in elevation illustrating the invention as applied to or in connection with a punch press of the type above just stated, some parts of the press being broken away;

Fig. 2 is a front elevation showing the di plate, punch mechanism, and feed mechanism of the punch press, said parts being on a somewhat larger scale than in Fig. 1;

Fig. 3 is a fragmentary view in front elevation showing part of the punch feeding mechanism on a somewhat larger scale than in Fig. 2;

Fig. 4 is a view in elevation, with some parts in section and some parts broken away, showing the parts just at the right of the dotted line marked 4-4 on Fig. l, the said parts being shown on a much larger scale than in Fig. 1;

Fig. 5 is a view partly in diagram but with some parts in front elevation;

Fig. 6 is a plan view, with some parts broken away, showing parts found just below the line marked 6-6 on Fig. l and showing the said parts on a much larger scale than in Fig. 1;

Fig. 7 is a fragmentary view in elevation showing parts just at the left of the dotted line marked 1-1 on Fig. 1;

Fig. 8 is a View corresponding to Fig. 5 but illustrating a modified arrangement; and

Fig. 9 is an enlarged section taken on the line 9-9 of Fig. 8, some parts being broken away.

The preferred arrangement illustrated in Figs. 1 to 7, inclusive, will first be referred to and described. The punch press illustrated is of a wellknown type, and hence, the parts thereof may be briefly enumerated as follows: The punch framework I2, the die plate l3, and the reciprocating punch plate I 4, which latter carries the customary punch 15 and cam-acting feed lug l6. Mounted on the die plate I3 is a slide I! that is pressed forwardly by a. spring I8 and is provided with a roller l9 which, when the die plate is depressed, is engaged by the cam lug l6 and slide I1 is then pressed rearward or toward the right in respect to Figs. 2 and 3. On slide I! is a spring-pressed friction-acting feed dog 20 and on the die plate I3 is a similar spring-pressed retaining dog 2|. The action of this feed mechanism is well-known and for the purpose of this case, it is only deemed necessary to state that when the slide I1 is pressed rearward, dog 2| prevents the strip or ribbon y'from being moved rearward and when slide I1 is returned forward, under the action of spring l8 after lug I6 and punch are lifted, feed dog 20 will frictionally clamp the strip or ribbon to the slide and produce the required or predetermined feed movement of the strip or ribbon. It may be further stated that under the action of the feed mechanism just described, rearward movement of the strip will be prevented and the proper feed movement of the ribbon will be produced, but .it will be possible by the application of a forward pulling force to move the ribbon through the feed mechanism and which movement would throw the timing of the punching action out of action.

Under the action of the punch slots or holes y will be produced in the strip y and the punched out portions will be dropped from the press. In some instances the punched out portions will be waste and the punched ribbon will be a finished or partly finished article, but in other instances the punched out portions may be for the making of certain articles and in which case the punched ribbon or strip will be waste. In either event the punched strip or ribbon must be taken care of and in accordance with my invention, it is arranged to be wound upon a receiving reel. This reel, in the drawings, is indicated by the numeral 22, is mounted on a support somewhat distant from the punch and is motor-driven. This support can take various forms but, as shown, in the drawings, it involves a floor-engaging anchor or base frame 23 provided with an upstanding post 24 with an offset secondary post 25. The post 24, at its upper end, has a bearing head 26 and to the upper end of the secondary post is applied a box-like gear housing 21. The reel 22, through connections now to be described, is arranged to be driven at its relatively slow peed from a small electric motor 28, the casing of which is shown as secured to the housing 21. I

The reduction mechanism here illustrated is of conventional type and, as shown, involves a spur pinion 29 on the rotor shaft of motor 28 and which pinion meshes with a spur gear 30 on a short shaft 3| journaled in the housing 2'! and a bearing 32 'of the housing. Within the housing 27 shaft 3| has a worm 33 that meshes with a worm gear 34 on a shaft 35 also journaled in bearings of housing 21. Shaft 35 has a worm 36 that meshes with a worm gear 3! carried. by a shaft 38 journaled in bearings on the housing and projecting therefrom. At its outer end shaft 38, by universal joint 39, is connected to a reelcarrying shaft 48 jcurnaled in the head 26. Reel threaded on the projecting end of the shaft 48.

By the action of spring 43, the reel will be frictionally coupled to shaft '40 so that it will be rotated at a relatively low speed from the motor through the reduction mechanism described or any other suitable reduction mechanism.

Located midway between the press and receiving reel is a contact supporting post which may be and, as shown, is supported from an arm 46 projected from the post 24. This contact sup porting post 45, at its lower portion, is provided with a laterally projecting contact pin or element 4'! that is insulated from said post 45 by insulating material 48, see particularly Fig. '7.

At a point considerably above the contact pin- 41 is a second contact 49, see particularly Figs. 5 and '7. This contact 49 is pivoted on a pin or projection 58, see particularly Figs. 5, 6 and '7, that projects from the post 45 but is insulated therefrom by insulating material 5 I. c The pinsor elements 47 and 59, as shown, are directly connected to sleeve- like heads 52 and 53, respectively, which, as shown, are rigidly but'adjustably secured on post 45 by set- screws 52 and 53. Pivoted upper contact 49 is shown as provided with a small counter-weight 49' which is little less in weight but sufiicient to overcome the weight of the radial projecting portion of said contact 49.

In this preferred arrangement the metallic stock strip or ribbon is used as a part of the electrical control circuit, and hence, a sort of a wiper-acting contact or friction device is arthe press on its way to the reel 22, is passed between the lower and upper contacts 4'! and 49 and between the spring prongs of wiper-acting contact 54. Here it may be stated that the frictional clamping action between the prongs 54 and the punched stock strip is only sufficient to maintain good electrical contact and to put a light tension on the strip stock as it is being wound on the reel.

Also, it may be here stated that the tension of spring 43 will be set so that it is sufiicient to cause the reel 22 to rotate with motor-driven shaft 49, but will not be sufiicient to cause breaking of the punched stock strip y if anything should happen to stop the punching machine while the motor-driven receiving reel is still in action.

The reel-actuating motor 28 is in a supply circuit 58 that is connected across the main or supply line 59. In the motor circuit 58 is a controlling switch 60, see particularly Fig. 5. Motor switch 68 arranged to be opened and closed at the proper times, hereinafter specified, by a differential relay which involves tandem arranged solenoids 6| and 62 and a reciprocating core 63. Both solenoids or coils 6| and 62, at one end, are connected to a battery 64, one side of which is grounded at 65. The other sides or ends of solenoids 6i and 52 are connected, respectively, by wires Ela and 62a to the heretofore noted contacts 47 and 49. The so-called wiper contact 5455 is grounded through a wire or conductor 66, as shown in Fig. 5. c

In Fig. 4 the numeral 61 indicates a casing secured to the base of post 25 and in which the battery 64 is adapted to be contained.

Operation of structure illustrated in Figs. 1+7, inclusive In starting the winding mechanism into action, the punched metal strip y will, as already stated, be passed below the upper contact 49 and above the lower contact 41. When the strip 1/ does not engage either of the said contacts 4749, the circuit to reel-actuating motor 28 will beopened and, of course, the receiving reel will not then be rotated. When the press is operated so as to produce enough slack to permit the strip y to engage lower contact 41, solenoid or coil 6| will be energized causing the core 63 to close motor switch 60, thereby starting the motor and actuating the reel 22 to wind thereon the punched strip and take up slack thereof. This condition is shown by full lines in Fig. 5.

At the time just stated current from battery 64 will be through coil 6|, through wire 61a to. contact 41, from contact 41 through a portion of "punched metallic strip 1 to contact 5455, and from thence from ground and back to battery. This operation of winding up the punched strip on the receiving reel will continue until the slack in the strip has been taken up substantially as shown by dotted lines in Fig. 5, and thereupon, coil 62 will be energized causing motor switch to be opened and the receiving reel stopped. At the time just now noted the flow of current from battery 64 will be through coil 62, wire 62a to upper contact 49, and from thence through a portion of the strip y to contact 54-55 and to ground and back to battery 64. When coil 62 is energized, core 63 will be retracted, thereby opening the motor switch 60, as just stated. Oficours'e, the arm 56,

which is preferably metal, could be grounded from the post 45, but that is n'ot'necessary since the controlling contacts 41-49 are insulated one from the other and from the metallic parts of the machine.

In Figs, 8 and 9 I have illustrated a somewhat modified arrangement in which the lower contact, corresponding largely to the contact 41, 1s employed, and in which structure the reel-actuating motor will preferably be provided with a flywheel that would cause the motor and receiving reel to be rotated by momentum for a short interval after the motor circuit has been broken. In this modified structure some of the parts are identical with those illustrated in connection with Figs. 1 to 7, inclusive, and hence, these very similar parts are indicated by the same numerals with the exponent a added thereto.

In this modified structure the lower strip-engaging contact 68 is shown as of the brush type and is supported by and insulated from the post 45a. The motor circuit switch 60a in this arrangement is subject to a solenoid or magnet 69, one side of which is grounded through battery 64a and the other side of which is connected by a wire to contact 68. Also in this structure wiper contact 54a55a is grounded through wire 66a. The reel-actuating motor 28a, which is in the circuit 58a, is shown as provided on its rotor shaft with a small flywheel 58b.

Operation of Figs. 8 and 9 From the foregoing the operation of the structure of Figs. 8 and 9 is probably obvious, but may be briefly stated as follows:

When the slack in strip 1 is such as to cause it to drop into engagement with brush contact 68, magnet 69 will be energized thereby closing switch 6011, thereby starting the motor 58a into action to operate the receiving reel. As soon as strip y is raised from contact 68, the battery circuit through coil 69 will be broken causing switch 68 to open and thereby cutting off the current to motor 28a. After the current is cut off from motor 2811., the motor under momentum will operate the receiving reel so as to continue the winding action to a considerable extent but not enough to take all of the slack out of the strip y.

From the foregoing it will be understood that while I have illustrated several embodiments of my invention that the same is capable of various other modifications or changes all within the scope of the invention herein broadly claimed.

What I claim is:

The combination with means for feeding a ribbon-like metal strip, and a receiving reel r0 tatively mounted at a point distant tlierefrorri and positioned to receive the strip, of an electric motor with connections for rotating said reel, a supply circuit for said motor including a portion of said metallic strip and a master switch, a two-coiled differentially acting magnet for operating said master switch, a supporting post, a lower or cutin electrical contact adjustably mounted on but insulated from said post, an upper or cut-out electrical contact adjustably mounted on but insulated from said post, an arm pivoted to said post below said metallic strip, a wiper contact carried by the free end of said pivoted arm and maintaining contact with said metallic strip at a point distant from said post, and a divided electric circuit, one branch of which includes one coil of said electro-magnet, said cut-in contact and said wiper contact, the other branch of which circuit includes the other coil of said electro-magnet, said cut-out contact and said wiper contact, the arrangement of said elements being such that the circuit to the first noted coil of said electro-magnet will be closed when, and only when, said metallic strip is engaged with said cut-in contact, and the circuit through the other coil of said electro-magnet will be closed when, and only when, said metallic strip is engaged with said cut-out contact,

W LIAM M- A D S N.-

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