US2174457A - Strip punching mechanism - Google Patents

Description

P 26, 1939. G. H. BENZON, JR.. El AL ,457

STRIP PUNCHING MECHANISM 7 Sheets-Sheet 1 Filed April 2, 1958 Sept. 26, 1939. G. H. BENZON, JR. ET AL 7 STRIP PUNCHING MECHANISM,

Filed April 2, 1938 7 Shets-Sheet 2 air Snag l l rzvertifirsx $901299 HBez-gozz :71

Sept. 26, 1939- I a. H. BENZON, JR. Er AL 2,174,457

STRIP PUNCHING MECHANISM Filed April 2, 1938 7 Sheets-Sheet 3 @0219? EBayoni Sept.

26, 1939. G. H. BENZON, JRL. ETAL STRIP PUNCHING MECHANISM Filed April 2, 1938 7 Sheets-Sheet 4 Filed April 2. 1938 G.'H. BENZON; JR.. ET AL Sept. 26, 1939.

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STRIP PUNCHING MECHANISM f 7 Sheets-Sheet 7 Filed April 2, 1938 Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE STRIP PUNCHING MECHANISM William Sellers & Company,

Incorporated,

Philadelphia, Pa, a corporation of Pennsyl- Vania Application April 2, 1938, Serial No. 199,709

12 Claims.

This invention relates to strip punching Inachines, and more particularly to a punch for use in forming control strips for use in the paper towers of automatic contouring lathes and the like such as those shown in our copending application, Serial No. 199,708, filed of even date herewith.

An important object of the invention is the provision in a machine of this character of a construction permitting a given predetermined tool shape to follow closely a contour lay-out for a given piece of work, and which construction will permit the ready correction of any errors made in selection of the movement of the tool 7 pattern.

A further object of the invention is the provision in a construction of this character of an arrangement such that the movement of the tool pattern is completed prior to any actual punching operation so that the position of the pattern may be corrected prior to such punching operation.

A further object of the invention is the provision of a construction of this character which is extremely simple in its operation and may be readily manipulated by an ordinary workman with but little instruction.

These and other objects we attain. by the construction shown in the accompanying drawings, wherein, for the purpose of illustration, we have shown a preferred embodiment of our invention and wherein:

Fig. 1 is a perspective View of a punching apparatus constructed in. accordance with our invention;

Fig. 2 is a perspective diagram of the type of control mechanism which is to be operated by the strips produced in the punching machine;

Fig. 2a is a. fragmentary detail of the control strip employed in a machine of the character diagrammed in Fig. 2;

Fig. 3 is a plan view of the table and slide;

Fig. 4 is aside elevation thereof;

Fig. 5 is a plan View of the table control mechanism and strip punching means;

Fig. 6 is a side elevation partially in section of the punch;

Fig. '7 is a sectional view showing the control shafts and the gearing associated therewith;

Fig. 8 is a section on line 8-8 of Fig. 6;

Fig. 9 is a detail strip produced showing the relative positions of the various punched openings produceable with the machine;

Fig. 10 is a semi-diagrammatic section showing in solid lines the normal position of the parts,

and in dotted lines the positions assumed by a selected operating element and the actuating yoke after initial movement of the yoke; and

Fig. 11 is a view similar to that of Fig. 10 with the parts shown in solid lines in the positions 5 they have upon completion of the primary yoke movement, and in dotted lines after completion of the secondary or punch-operating yoke movement.

As hereinbefore noted, the machine with which 10 the strips to be produced by the present invention are to be employed is shown in our abovenoted copending application for contouring Wheel lathe. This lathe and its controls are diagrammatically illustrated in Figs. 2 and 2a. 15

Referring now more particularly to these figures, the numeral It generally designates a suitably driven rotating chuck in which the work piece H, at present shown as a car wheel, is mounted for the contouring operation. This chuck may have its axis at any desired angle, in the present illustration being horizontally disposed, and associated with the chuck is a turret assembly 12 comprising a slide l3 and the turret proper, indicated at hi, the latter carrying the 25 cutting tool l5. The turret proper is movable both perpendicularly and longitudinally to the axis of the chuck, the perpendicular movement at present being illustrated as provided through a Worm drive l6 engaging in a nut ll on the slide it, which slide is mounted in suitable guides i8 extending transversely of the lathe bed I9. A second worm, not shown, operated through the medium of a spline shaft 29 serves to shift the turret head I4 upon the slide in a direction 1ongitudinal to the chuck axis. These movements of the turret are all conventional and well known, and need no further description or illustration than that here given. Operation of the worms is obtained through continuously operating ratchets 2| associated therewith, these ratchets including normally disengaged pawls 22, engagement of which is effected through air cylinders 23. A device 24, generally termed a paper tower, has a perforated strip 25 fed therethrough, the perforations of this strip controlling not only the action of the cylinders 23, but likewise a disengaging clutch 24a. to stop operation of the machine.

The strip 25 is produced in the machine forming the subject matter of the present application. This machine comprises a suitable support 26 having associated therewith an easel 21 to support a lay-out 28 of the contour of which it is desired to have the contouring machine or lathe reproduce. In the present instance this contour is shown as that of the car wheel II. Upon the support 26 there is disposed a carriage 29 (Figs. 1, 3 and 4) somewhat similar in function to the traveling carriage of the lathe and carrying a slide 38 corresponding to the slide l2 of the lathe. Extending longitudinally of the support 26 are guide bars 3! upon which the carriage 29 is longitudinally shiftable. These guide bars are secured at their ends in supports 32 which rotat= ably mount a worm 33 and a spline shaft 34 corresponding to the worm l6 and spline shaft 25 of the lathe. Extending longitudinally of the carriage is a worm 35 extending through a nut 35 on the slide 30. This worm may be either rotated by hand through a hand-wheel 31 or may be driven from spline shaft 34 through a gear 38 mounted on the spline shaft and having driving connection with a gear 38 secured to worm 35. Detachably secured to the slide for interchange with similar devices is a template 48, the outer end 4| of which is constructed to have the same form as the tool l5 which is to be employed in the contouring machine. For convenience, the upper face of the outer end of the template is marked with directions corresponding to those in which the slide can be moved through the control mechanism about to be described.

It will be obvious that by suitable operations of worms 33 and 35 the tool-simulating inner end of the template 48 may be caused to follow the contour of the lay-out pattern 28 at present shown as a drawing. For example, assuming that the tool is to be fed only into the work, from its position shown in Fig. 1, the contour would be followed by a simultaneous in and forward movement while from its position shown in Fig. 3 the contour would be best followed by alternate reverse and in motions.

The punch proper, indicated generally at 42 is located at one end of the support 26 and comprises spaced side frames 43 connected through transverse structure 44, affording a slot 45 for the passage of the strip 46 from which the control strip 25 is to be formed. At one side of this slot a supply roll 41 of the strip material is rotatably supported, a suitable means, such as friction block 48, being employed to retard rotation thereof.

At the opposite side of the slot the frames 43 support a draw roll 49 over which the strip 25 passes after punching. Above the slot, the cross member 44 supports a plurality of spring-elevated punches which may be generally classified as track punches 50 and operation control punches 5|, four of the latter being shown in the present instance. From the paper draw roll the punched strip is passed to a winding roll 52 which is driven from the draw roll 48 through step-up gearing 53 and a friction driving clutch 54 permitting relative slip between the roll and drive. The friction of this clutch may be regulated through an adjustable tension device such -as indicated generally at 55.

Mounted in the side members 43 adjacent the top thereof is a shaft 56 which, between the side members bears av yoke frame 51 including a transverse cross bar 58 overlying the track punches and the operation punches. This cross arm bears fixed operating pins 59 for engagement with the track punches 50 and loosely mounted pins 60 for cooperation with the operation control punches 5|, means being provided, as hereinafter more fully set forth, for selectively locking these slidably mounted pins aganst movement with relation to the cross arm.

At its outer end the shaft 56 has secured thereto an operating arm 6| through which the shaft may be oscillated and the cross arm of the yoke, accordingly, elevated or depressed to bring the pins into engagement with the punches. This arm is normally kept in its elevated position through a spring 62 surrounding a rod 63 which, at its upper end, is pivoted to arm 6!, and adjacent its lower end passes through a guide 64. At its lower end, the rod 63 is pivoted to an arm 85 pivoted upon the shaft of draw roll 49. The connection between this arm and the rod mounts a pawl 66 cooperating with the gear 51 secured to the shaft of the draw roll. This pawl is so constructed that during downward movement of arm 8| it rides over the teeth of the gear and during upward movement thereof it rotates the same, thereby advancing the paper strip through one step, pawl 68 preventing return movement of the gear. To assist in preventing this return movement and any possible movement of the draw roll through slack in pawl connections, or the like, the shaft 69 of this draw roll is equipped with a tension spring 18 and an adjusting device H therefor whereby the roll may be drawn firmly against its bearings.

At their inner ends, the side frames 43 support shafts 12 and I3 aligning respectively with the worm shaft 33 and the spline shaft 34, and connected thereto by collars l4, shaft 12 having an operating handle 15 through which the worm shaft 33 may be manually rotated.

Shaft 12 has mounted thereon ratchet discs '16, 11, 18 and I9, and adjacent each of these ratchet discs mounts a lever for each disc. Each lever 88 is in the form of a bell crank, the arms of which are alternately adapted to engage against stops 8| and Bla, the stops Bid at present shown as in the form of a transversely-extending shaft and the stops 8| in the form of screws adjustably directed through these shafts. The arm of each lever which is adapted to engage the stop Bl has pivoted thereto at 82 a pawl 83 for engagement with the associated ratchet and to this pawl, in turn, is pivoted the lower end of a link 84. Links 84 are each formed in two sections which are slidably engaged with one another at 85 and are held in a normally collapsed condition through springs 86. The upper end of the upper section of each link is pivoted at 8! to the tail of a lever 88 loosely pivotedupon the shaft 58 and having its forward end overlying the yoke. These levers will hereinafter be referred to, for the purpose of identification, as the forward, in, reverse, and out levers, corresponding to the various operation control movements of slide 30.

The forward, in, and reverse levers adjacent their forward ends overlie the upper ends of the three left-hand pins 60 for coaction therewith and their forward extremities are provided with rotatable buttons 89 by means of which they may be locked to the yoke. When the forward end of a given, lever is locked to the yoke, its corresponding pin 60 is held against upward movement and, accordingly, will actuate the associated punch when it comes in contact therewith. The out lever does not coact with a pin 68 and merely has its end closely overlying the yoke so that it cannot be moved downwardly unless the yoke is in lowered position, and this lever is not equipped with the locking device of the forward, in and reverse levers.

prevent upward movement thereof.

Associated with the fourth, or right-hand, loose pin 60, is a rotatable button 90 having an arm SI which, through rotation of the button, may be caused to overlie the upper end of this pin and It will be obvious that when any of the forward, in, or reverse levers is locked to the yoke, and the yoke is operated, not only will the associated pin 66 actuate the corresponding punch but the lever will be caused to rotate, thereby actuating the associated link 84 and the ratchet mechanism to which it is connected, thus causing a corresponding operation of the associated ratchet disc 16, H or IE. Ratchet discs I6 and 18 are loosely mounted on shaft 12 and are geared at 92 to shaft 13, and the ratchets associated with these discs act oppositely thereupon so that when one ratchet is actuated shaft 13 is rotated in one direction and when the other is actuated this shaft is operated in the opposite direction, therefore, moving the slide 30 in or out as selected. Movements of these ratchets are obtained through operation of the in and out levers. Ratchets l! and 19 are directly keyed to shaft 12, and the ratchet wheels associated therewith are reversely disposed so that reverse operations of the worm 33 are obtained by operation of the forward and reverse levers. Levers 88 are normally held in their lowered positions through tension springs 93 connected between a cross bar 94 and these levers.

The punching operations of which the present machine is capable are illustrated in Fig. 9. It will be obvious that to obtain the in, forward or reverse movements it is simply necessary to lock the lever 88 corresponding to these movements to the yoke and then depress the arm or if combination of either forward or reverse movement with an in movement is desired, to simultaneously lock in and forward or reverse levers to the yoke, as likewise shown by the punching indications on Fig. 9. For a stop operation, the stop button is rotated to cause its arm 9| to overlie the associated pin. Each operation of the lever will result in the formation of track openings to be engaged by the track pins 49a of the draw roll and by the corresponding pins of the paper tower 24.

It will be obvious that, since the selections for movement of the carriage are entirely a matter of judgment of the operator, it will often occur that a selection will be erroneous, necessitating resetting of the mechanism before the actual punching occurs. The mechanism hereinbefore described not only enables the operator to reset the mechanism, but provides a warning of the initiation of the actual punching operation.

Examining Figures and 11, it will be noted that while the pawl 83 is, in the lowered position of link 84, held out of engagement with its associated ratchet, a primary movement thereof engages the pawl with the ratchet swinging the pawl about the pivot 82 upon the lever 80. As shown in Fig. 11, continued upward movement of link 84 rotates the ratchet disc effecting the operation of the shaft, and the movement of arm 6| necessary to complete operation of the ratchet disc leaves the operating pin 60 just out of engagement with the associated punch 5|. At this time the second arm 88a of the bell crank lever 88 has come into engagement with the stop 8|a, thus preventing further movement of the lower end of link 84 and holding the ratchet B3 in the associated notch of the ratchet disc, preventing further actuation of the shaft which has just been operated.

In the final movement of the arm 6| the punch is operated and during this operation the spring 86 of link 84 is compressed placing an additional strain on arm 6| which will serve to warn the operator. Since the primary movement of the arm 6| has actuated the shaft, the operator can see Whether or not the template 40 is properly following the lay-out diagram 28 and if it is not he can immediately correct the error. If it is found that the structure has moved in when it should not have been moved in, the in button is released to release the lever 88 associated therewith and permitted to return to its normal position. 1 Still holding the arm 6| in its middepressed position, he now engages the out lever with his hand and depresses the forward end thereof, thereby reversing the previous in operation and restoring the mechanism to its original position. If a forward operation has been mistakenly employed, this may be corrected by permitting the arm 6| to elevate to its normal position, disengaging the forward lever, engaging the reverse lever and again partially deressing the arm.

While we have, at present, shown the punching operations as confined to in, forward, reverse and stop, it will be obvious that additional functions of the machine may be controlled by the addition of further controllable punches, the present arrangement being illustrated due to the fact that ordinarily feeding operations are usually made only into and across the work, either in a forward or reverse direction.

The construction illustrated being capable of considerable modification without departing from the spirit of the invention, we do not wish to be understood as limiting ourselves thereto except as hereinafter claimed.

We claim:

1. Apparatus for producing control strips of the type described, means to feed a strip to be punched, means to support a pattern, a tool-simulating template, means to move said template to follow the outline of the pattern comprising a plurality of independently selectable and actuat able operating elements each of which when actuated imparts a movement to the template differing from those imparted by the remaining elements, an actuator for said operating elements and to which each element is connected in the selection thereof and a punch for each element actuated by said actuator to punch the strip only when the corresponding operating element has been selected.

2. A device as claimed in claim 1 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof.

3. A device as claimed in claim 1 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof, and means to definitely limit movement of a selected operating element at the close of the primary movement of the actuator, the connection between the operating element and the actuator comprising a member yielding to permit the secondary movement of the actuator.

4. Apparatus for producing control strips of the type described, means to feed a strip to be punched, means to support a pattern, a toolsimulating template, means to move said template to follow the outline of the pattern comprising a plurality of independently selectable and actuatable operating elements each ofwhich when actuated imparts a movement to the template differing from those imparted by the remaining elements, an actuator for said operating elements and to which each element is connected in the selection thereof, a punch for each operating element, an operating pin for each punch loosely mounted on the actuator and means to hold the pin of the corresponding punch against movement effective upon selective connection of an operating element to the actuator.

5. A device as claimed in claim 4 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof.

6. A device as claimed in claim 4 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof, and means to definitely limit movement of a selected operating element at the close of the primary movement of the actuator, the connection between the operating element and the actuator comprising a member yielding to permit the secondary movement of the actuator.

'7. Apparatus for producing control strips of the type described, means to feed a strip to be punched, means to support a pattern, a toolsimulating template, means to move said template to follow the outline of the pattern comprising a carriage, a shaft to actuate said carriage transversely, a slide on said carriage, a shaft to actuate said slide longitudinally of the carriage, said slide supporting said template, a plurality of independently selectable and actuatable operating elements for said shafts each of which when actuated imparts a movement to the slide differing from those imparted by the remaining elements, an actuator for said operating elements and to which each element is connected in the selection thereof and a punch for each operating element actuated by said actuator to punch the strip only when the corresponding element has been selected.

8. A device as claimed in claim 7 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof.

9. A device as claimed in claim 7 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof, and means to definitely limit movement of a selected operating element at the close of the primary movement of the actuator, the connection between the operating element and the actuator comprising a member yielding to permit the secondary movement of the actuator.

10. Apparatus for producing control strips of the type described, means to feed a strip to be punched, means to support a pattern, a toolsimulating template, means to move said template to follow the outline of the pattern comprising a carriage, a shaft to actuate said carriage transversely, a slide on said carriage, a shaft to actuate said slide longitudinally of the carriage, said slide supporting said template, a plurality of independently selectable and actuatable operating elements for said shafts each of which when actuated imparts a movement to the slide differing from those imparted by the remaining elements, an actuator for said operating elements and to which each element is connected in the selection thereof, a punch for each operating element, an operating pin for each punch loosely mounted on the actuator, and means to hold the pin of the corresponding punch against movement effective upon selective connection of an operating element to the actuator.

11. A device as claimed in claim 10 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof.

12. A device as claimed in claim 10 wherein the actuator has primary and secondary movements and the operating elements are moved by the primary movement thereof while the punches are actuated by the secondary movement thereof, and means to definitely limit movement of a selected operating element at the close of the primary movement of the actuator, the connection between the operating element and the actuator comprising a member yielding to permit the secondary movement of the actuator.

GEORGE I-I. BENZON, JR. HARRY RUSSELL YOUNG.

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