US2018366A

US2018366A - Punch

Info

Publication number: US2018366A
Application number: US707768A
Authority: US
Inventors: Klause Karl
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-01-22
Filing date: 1934-01-22
Publication date: 1935-10-22
Anticipated expiration: 1952-10-22

Description

Oct. 22, 1935.

K. KL AUSE PUNCH Filed Jan. 22, 1934 INVENTOR W MQM' ATTORNEY 5 Patented Oct. 22, 1935 PATENT OFFICE PUNCH Karl Klause,

Appleton, Wis.

Application January 22, 1934, Serial No. 707,768

' 7 Claims.

My invention relates to improvements in punches.

The punching of holes in a moving substance without damage to the punch or to the female 5 die in conjunction with which the punch is used has long constituted a problem in the art. One of the principal phases of the problem referred to is that which arises from the difliculty in placing the female die accurately in position to receive the stroke of the male die, since any inaccuracy must necessarily in the prior art devices I result in abrasion of the dies and in inaccurate placement and configuration of the aperture in the punched material.

It is, therefore, the object of my invention to provide a type of female die heretofore unknown in the art of punching moving material, and to provide in such a die means for disposing of the slugs punched out by themale die.

It is also an object of my invention to provide in a punching mechanism provided with my new type of female die, means for conserving the material of which my female die is composed.

In the drawing:

Figure 1 is a side elevation of my punching and tape die handling mechanism.

Figure 2 is a vertical section of the punching mechanism shown in Fig. 1, the parts shown being greatly enlarged.

Figure 3 is a vertical section of the structure shown in Fig. 1 with the male die performing a punching operation.

Like parts are designated by the same reference characters throughout the several views.

To assist in a general understanding of'the nature of my invention, I may describe my invention preliminarily as being incorporated in a mechanism wherein a male punching die is operated through the material to be punched and into my improved female die which is supported during the punching operation by an anvil toward which the male die is momentarily projected; and in addition thereto, my invention is incorporated in a mechanism for feeding the material of my improved female die forwardly for repeated punching operations.

As disclosed in the drawings, 1 have shown my improved punch and female die therefor in position to operate upon a Web ID of paper or other similar material, which in passage through a web handling machine, not shown, is fed through my punching device which includes two rotors ll and 12, one of which is positioned above the web l and the other below it. I provide each of the vrotors II and I2 with a spur gear l3 and I4, re-

spectively, whereby to cause them to synchronously rotate under the influence of a pinion l5 driven by some external source of power. But it will be noted that the rotors are spaced apart to permit free passage of the web l0 between them except during the actual punching operation which will be hereinafter described.

Rotor l l is mounted upon a stationary shaft l6 upon which is a. fixed collar l1 substantially circular in exterior configuration except that it is contoured to form a cam lobe [8. The rotor II is slotted substantially radially at to receive a slide l9 which is retained in the slot by means of clips 2|. From the slide l9, a cam following pin 22 extends laterally of the rotor ll into a position to contact the exterior surface of the collar l1 and to interact with the cam lobe l8 to project the slide radially outwardly. Punch pin 23 forming an extension of the slide I9 is there by projected beyond the periphery of the rotor 20 H, and I provide a spring 24 disposed between the end of the slot 20 and the slide l9 to cause the slide to be urged to a punch retracting position after the passage of the cam following pin 22 beyond the cam lobe l8.

In the exterior face of the rotor I2, I provide an anvil 26 which in its rotation assumesa position opposite the cam lobe l8, and therefore opposite the punch pin 23 when the punch pin is projected beyond the periphery of its rotor. 3 Since the anvil stands up from theperiphery of the rotor l2, it is in position to support the web [0 and mynew female die 21 at the moment of impact of the punch pin 23. At all other times during the rotation of the parts of my punching apparatus, there is ample space between the rotors for the free movement of the web l0 and the maintenance of the die material 21 in relatively static position.

My new die material 21 comprises a sheet, web 9 or tape of a material which is penetrable by the punch pin 23 but preferably a material which is sufficiently spongy to retain slugs 28 comprising material punched out of web 10.

I have found that by placing a sheet of material such as cardboard 21 under a paper web ID, the punch pin 23 will fracture the surface of the cardboard at 29 and the margins of the fracture will comprise cutting edges equivalent to the cutting margins of an aperture in the type of female die heretofore used in the art. Under some circumstances, I have found that the cleavage lines at 29 may be made sharper and more effective for punching certain types of web If] by coating the surface 30 of the cardboard 21 with sodium silicate or a glue-size or other comparatively brittle material, but for the average type of paper such special treatment of the surface of my female die material 21 is not necessary. My female die, therefore, may be described as an imperforate but perforable material and attention is now called to the fact that the slugs 28 are not punched clear through the material 21, but by reason of the spongy character thereof are impregnated into the material 21 and retained in the recesses created by the punching process, thus disposing of the slugs 28 and preventing their interference with the operation of any machinery in conjunction with which my punching apparatus is used.

I have found that if a hollow round or square punch is used in conjunction with my female die it is not necessary that slugs 28 be impregnated into the die material, but may be discarded, and the male die following this practice need only penetrate the female die sufficiently to accomplish the cutting operation.

It will be obvious from this description also that the punch pin 23 does not contact the anvile 26 and the anvil 26 is merely momentarily placed in position opposite the punch pin 23 to receive. the impact incident to the punching of the web It and the impregnation of the material 21 by the slug 28 removed from the web.

It will be obvious from the above description that as the web I0 advances between the rotors H and I2, and as the male die 23 projects by reason of the contact of the pin 22 with the lobe I 8, there is an advance of the material engaged between the male die 23 and the anvil 26. Assuming that the advance of material is approximately one inch in the exempliflcation of the device shown in Fig. 2 during the momentary engagement of the anvil, tape, web, and punch die, and assuming the punch die to be approximately one-fourth of an inch in extent at its punching tip 3|, there would be an excessive waste of tape 21 if no mechanism was supplied for conserving the tape. I therefore provide a retracting device 25 as shown in Fig. 1. This device includes a retractor plate 32 over which the tape passes in its movement from the roll 21 to the bite of the rotors H42, and I provide a spring plate 33 to engage the tape tightly frictionally between the retractor plate 32 and the spring plate 33.

Retractor plate 32 is mounted upon an arm 34 which is supported upon pin 35 for oscillation between stop pins 36 and 31. A spring 33 is provided to return the arm 34 to its position against stop pin 36 after each punching operation. With this mechanism it will be seen that as each punching operation draws the tape 21 forwardly ap-' proximately an inch as above described, the arm 34 is oscillated forwardly until it contacts the stop pin 31 which is so set as to permit only approximately five-eighths of an inch of forward movement of the retractor plate 32. The excess movement of the tape 21, approximately three-eighths of an inch, is accomplished against the resistance of friction between spring 33 and the retractor plate 32; then when the punching operation is complete and the punch 23 is retracted by spring 24, the tape is released for return by spring 38 which accomplishes a return of only five-eighths of an inch, thus disposing an unperforated fresh surface of the tape 21 in the bite of the rotors II and I2 for the next punching operation. This explains the apparent discrepancy between the distance from the punching being accomplished in Fig. 2 and the previous punching 33 illustrated at the right in web III of Fig. 2, as compared with the distance between the slugs 28 in the tape 21.

In operation, my punching device performs a web punching action as follows. Web It is presumed to be constantly passing through the bite of rotors II and i2 freely and without appreciable frictionable contact with any of the members described above until the male die 23 is brought approximately to the point where the punching operation is to be accomplished. At the same time anvil 26 has been rotatively brought up to its position indicated in Figs. 2 and 3. The cam following pin 22 then strikes lobe I8 upon the collar I1 and the male die 23 is projected outwardly radially so as to strike a slug 28 from the web 10 and project it into the soft spongy material of tape 21. Tape 21 has theretofore been stationary beneath the web I0, but as the slug 23 from the tape I0 is projected into the material of the tape 21, the tape is jerked forwardly.

Since the tape is frictionally secured in the retractor 25, the tape moves forward quite freely 31. Thereafter in the forward movement of t a until the arm 34 of the retractor contacts the in web 10 and tape 21 under the influence of e forward movement of the male die 23, the forward movement is resisted by the friction betweenthe spring 33 and the retractor plate 32, but the spring pressure of the spring 33 is so gauged as to permit the continued forward movement against such resistance; then as the punch 23 is retracted by spring 24 after the passage of the cam following pin 22 beyond the lobe 18, the web Ill continues to travel on and the tape 21 comes to rest momentarily.

The tape is then drawnbackwardly' by spring 38 a distance somewhat less than the forward movement of the tape 21, and the tape is then in such a position as to offer a fresh surface for the and a rotor therefor together with means for pro- 50 jecting the maledie at a given point in the retation thereof, of a female die comprising a perforable material mounted for advance with the male die.

3. The combination with a rotatable male die and a rotor therefor together with means for projecting the male die at a given point in the.

rotation thereof, of a female die comprising a perforable material mounted for advance with the male die, and an anvil to move with the perforable material in the advance of the female die.

4. The combination with a moving web of material to be perforated, of a male die on one side of the web, moving in substantially the same direction with the web, and a tape of penetrable material on the other side of the movable web and mounted to move with the web in substantial parallelism therewith during the punching operation.

5. The combination with a moving web of material to be perforated, of a male die on one side of the web-moving in substantially the same direction with the web, a tape of penetrable material on the other side of the movable web and mounted to move with the web during the punching operation, and means for retracting the tape between punching operations.

6. In a punching device of the character described, the combination with a tape die, of means for progressively advancing the tape die with each punching operation, and means for retracting the tape die.

'7. The combination with opposed members comprising a male die and an anvil respectively mounted for advance during a punching operation, of a penetrable die between the members for advance during each punching operation, an arm provided with a friction detent for engaging the penetrable die, a stop positioned to prevent the arm from advancing the full distance of each advance of the web, and resilient means for retracting the arm after each advance.

KARL KLAUSE.