US2171482A

US2171482A - Perforating machine

Info

Publication number: US2171482A
Application number: US189370A
Authority: US
Inventors: Stig E Rosenberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-02-08
Filing date: 1938-02-08
Publication date: 1939-08-29
Anticipated expiration: 1956-08-29

Description

Aug. 29, 1939.

S. E. ROSENBERG PERFORATING MACHINE Filed Feb. 8, 1958 2 Sheets-SheetA l Aug. 29, 1939. s. E. RosENBERG PERFORMING MACHINE Filed Feb. 8, 1938 2 Sheets-Sheet 2 Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE 3 Claims.

The present invention relates to perforating machines which are used in many industries and which have a wide use in the manufacture of shoes to ornament various forms of shoe uppers and parts thereof, and more particularly to that type of perforating machine having a perforating die and a die striking plate between which the work is impaled on the cutting edges of the die, means permitting at least one of them, the die and the plate, to yield under the impaling pressure, and rigid means mounted on the die having a striking plate impact surface arranged in the plane of said edges.

The principal objects of the present invention are to produce a perforating machine of the type hereinbefore referred to in whi'ch the yielding means is correlated with the cutting edges of the die, some of which edges are arranged in at least one cluster, to cushion the impaling pressure uniformly thereover, and to produce a perforating machine of the type hereinbefore referred to in which the rigid means, mounted on the die, having a striking plate impact surface arranged in the plane of said edges, are correlated with a work clamp having an internal window therein.

To the accomplishment of these objects, and such others as may appear hereinafter, the various features of the present invention reside in certain constructions and arrangements of parts hereinafter described and then set forth broadly and in detail in the appended claims which possess advantages readily understood by those skilled in the art.

The various features of the present invention will be understood readily from an inspection of the accompanying drawings illustrating the best forms of the invention, at present devised, in which,

Figure l is a detail View in front elevation showing the various features of the invention embodied in a perforating machine of the type in which the` die 5cuts the work supported upon the striking plate;

Fig. 2 is a detail View in plan of a work supporting structure of the upstanding cutting edge die type;

Fig. 3 is a detail view in front elevation showing the various features of the present invention embodied in a perforating machine of the type in which the striking plate in moving downward impales the work upon the upstanding cutting edges of the die;

Fig. 4 is a detail View in front elevation showing a modification of the features illustrated in Fig. 3, and

Fig. 5 is a diagrammatic View in plan illustrating how the rubber bed is correlated with the design of the cutting edges of the die.

In the embodiment of the invention illustrated in Fig. 1, the downwardly moving head 6 of a well-known type of perforating machine is provided with a groove 'I which receives a tongue 8 carrying a die 9 having a plurality of downwardly directed cutters or tubes Ill, the cutting edges of which are arranged in a horizontal plane. As usual, in this type of die it carries a stripper plate II supported by the lower ends of a plurality of rods I2 which are held in a position to support the stripper plate II in a plane below that of the *cutting edges of the die by a plurality of coiled springs I3, one for each rod. This is all standard construction in the well-known. type of machine referred to.

In addition to this standard construction, the bottom of the die 9 is provided with a plurality of hardened pins I4, I5, I6 and I'I, the upper ends of which are secured rigidly to the die and the lower ends of which, constituting the impact surfaces, respectively, are arranged in the plane of the cutting edges of the dies. These pins I4, I5, I6 and I'I are located outside the area occupied by the cutters or tubes I0 so that the pins clear the work during the perforating operation. Holes similar to the holes through which the cutters or tubes I0 pass are provided in the `stripper plate for the free passage therethrough of the pins I4, I5, I6 and I'I.

The work may be mounted on a work support I8 of the anvil type which is carried by a slide I9 to permit the anvily to be moved from a position of pressure to and from a position of clearance in a well-known manner. The portion of the work tobe perforated is positioned flatwise upon a hardened steel striking plate 20 secured to the uppermost surface of the anvil. The work may be clamped to the plate 20 by a clamping mask 2| of the type illustrated in` Fig. 2.

With this construction, after the work has been positioned properly on the anvil I8, the anvil I8 has been moved into the position of pressure, and the clutch of the machine thrown into operation, the head 6 is moved downwardly to 'cause the cutters or tubes IIJ to be forced through the supported work. The stroke of the head B ls adjusted to cause the cutting edges of the die to pass completely through the work into contact with the striking plate 20, but the force of the impact is exerted and distributed equally over the impact surfaces of the pins I4, I5, l@ and Il, thus preventing the engagement of the striking plate and the cutting edges of the die from making any impression on either of them.

In order to prevent damage in the event the stroke of the head 6 is too long, a sheet of rubber 22 is interposed between the bottom of the anvil and the slide I9, the anvil i8, slide l 9 and rubber sheet 22 being secured together by screws 23 threaded into the slide and loosely passing through the rubber sheet and the bottom of the anvil, a head 24 on each screw 23 serving to limit the normal position of the anvil relatively to the slide i3. l

Referring to Fig, 3, the hardened steel striking plate 25 is mounted in the head 26 of another well-known type of perforating machine in which the head is reciprocated vertically to impale the work on the opstanding ycutting edges of a die 2l' mounted upon the upper surface of an anvil 23 carried by a slide 29, a rubber sheet 35 being interposed between the bottom of the anvil and the slide. The die 2l is pro-vided with the usual yieldingly mounted stripper plate 3l. The rigid hardened

steel pins

32, 33, 34 and 35 project upward from the die 27, their impact surfaces being arranged in the plane of the cutting edges of the die. The

pins

32, 33, 34 and 35 are arranged relatively to the cutting edges of the die and to the Work in the same manner as the pins I4, l5, i6 and il illustrated in Fig. 1.

As indicated in Fig. 3, the sizes of the anvil 28, slide 29 and rubber sheet 3E) increase in accordance with the increase in number of, or area covered by, the cutting edges of the die, in order that the impaling pressure may be transmitted uniformly over the entire surface of the sheet 22 and thus render it effective to act as a yielding bed for the anvil'irrespective of size thereof.

Instead of nterposing the rubber sheet between the bottom of the anvil and the slide as in Figs. l and 2, the rubber sheet 3?, (Fig. 4), may be interposed between the striking plate and another plate 39, the three parts being secured together in the same manner as the anvil, sheet and slide described hereinbefcre. The plate 39 carries the tongue 40 which ts in the groove therefore formed in the bottom of the reciprocating head 4l.

As illustrated in Fig. 2 when a clamp 2| is used with the die 2l, (Fig. 3), the window 42 clears the

pins

33, 34, 35 and 36 which also clear the work.

It will be understood by those skilled in the art that the variousfeatures of the present invention may be used just as advantageously with iiat bed dies as with anvil dies. Many flat bed dies are provided with a large number of cutting edges some of which are arranged in at least one cluster. Because of such an arrangement, the pressure under which the work is impaled upon the cutting edges is transmittedY differentially over the area dened thereby. Fig. 5 illustrates the perforations formed in a piece of work, the perforations being arranged in a line 43 and in a cluster 44. These perforations, for the purpose of disclosure, are illustrated as being superimposed upon a rubber sheet 45 of the type illustrated in Figs. 1, 3 and 4. As illustrated in Fig. 5, the rubber sheet 45 is provided with a plurality of holes 46 therein which are arranged relatively to the

perforations

43 and 44 to spread the yield of the rubber sheet differentially over its extent and thus correlate the yield with the differential -impaling pressure exerted on the Work in form- Y ing the line 43 and the cluster 44.

Nothing herein explained is to be interpreted as limiting the various features of the present invention in the scope of its application to use in connection with the particular machine or the particular mode of operation or both selected for purposes of illustration and explanation. While the particulars of construction herein set forth are Well Suited to one mechanical form of the invention and to the use to which it is put, it is not limited to this use, nor to these details of construction, nor to the conjoint use of all its features, nor is it to be understood that these particulars are essential since they may be modiiied Within the skill of the artisan Without departing from the true scope of the actual invention, characterizing features of which are set forth in the following claims by the intentional use of generic terms and eXp-ressions inclusive of various modiiications.

What is claimed as new, is:

1. In a perforating machine, the combination with a perforating die and a die striking plate between which the work is impaled on the cutting edges of the die, some of said edges being arranged in at least one cluster, of ydifferential yielding means associated with the die correlated with the cutting edges to cushion the impaling pressure uniformly thereover.

2. In a perforating machine, the combination with a perforating die, a die striking plate between which the work is impaled on the cutting edges of the die, a work supporting surface upon which the Work is mounted, and a work clamp having an internal window therein, of a plurality of rigid pins, mounted on the die within the area bounded by the window, each pin having a striking plate impact surface arranged in the plane of said edges.

3. In a perforating machine, the combination with a perforating die, a die striking plate between which the work is impaled on the cutting edges of the die, a work supporting surface upon which the work is mounted, and a work clamp having an internal window therein, of a plurality of rigid pins, mounted on the die within the area bounded by the window and outside the area bounded by the work, each pin having a striking plate impact surface arranged in the plane of said edges.

STIG E. ROSENBERG.