US2325405A - Spacing device for punch presses and the like - Google Patents

Description

Jufly 27, 1943 w. JAGOSZ 5 SPACING DEVICE FOR PUNCH PRESSES AND THE LIKE Filed Nov. 30, 1942 i" .2. 41 I Ea a! y I o o 0 o o Patented July 27, 1943 UNITED sTATEs PATENT orrice Walter Jagosz, Detroit, Mich.

Application November 30, 1942, SerlalNo. 467,447

6'Olaims. (Cl. 164-86) My invention relates to punch presses and like tools employed for the purpose of producing a series of holes or apertures in plates of metal and other material, and its principal object is to provide means whereby such holes or apertures may be more quickly and accurately produced than is possible with devices for this purpose at present in use.

According to the conventional method of forming a'series of holes, for example, in a quantity of aluminum or steel plates, it is customary to lay out or mark oif the holes, either individually or by means of a template, on each piece and then to transfer the piece to a drill or punch press and make the holes at the points indicated. It is found, however, that due to errors in laying out, and to the difilculty of accurately following the indications, it is impossible to produce uniformity of work at the speed required in methods of mass production.

According to the present invention, I provide an accurate template and attach the same to the work piece, using the template in conjunction with certain ancillary devices to be hereinafter described, whereby the punching or drilling operation is so controlled as to produce uniformly accurate work throughout a large production volume with a greatly reduced deterioration of the tools employed.

In order that my invention may be readily understood I will now describe a preferred embodiment of the same as used in conjunction with a punch press, reference being had to the accompanying drawing, in which drawing- Figure 1 is a vertical section, taken on line i-i of Figure 2, showing one form of my improved device together with the adjacent portions of a punch press.

Figure 1A is a fragmentary vertical section corresponding to Figure 1 showing a modification of my device as used in conjunction with a drill press.

Figure 2 is a plan view of the device.

Figure 3 is a plan view of the work piece shown in position in Figure 1, and

Figure 4 is a plan view of the work holder.

Like characters designate corresponding parts throughout the several views.

In the drawing, I designates a punch, which is held in the conventional reciprocatory punch holder, not shown. 2 is the die which, in the instance shown, is formed as a bushing and secured within the regular shoe 3 by. means of a set screw St, the said shoe being fastened to the bolster plate of the press as by the cap screws 32.

4 indicates the work holder or template on which the accuracy of the spacing depends, the said holder being in the form of a plate having on its face projections 4| by which the work piece 5 is held in position during the punching operation. Upon the work piece 5 is superposed a cover-plate 6 which is of the same shape as the work piece and held in position between the projections 4| of the work holder.

In the work piece 5 it will be observed that there are three rows of holes, the center holes 5| being relatively large while the outer rows 52, 53 are of smaller diameter, and some of the holes 53 are still to be punched as indicated in dotted circles, this arrangement conforming to the condition of the work as shown in Figure 1. Upon the upper surface of the bushing 2 and formed integral therewith is a pilot 2i having an opening 22, the upper edge of which acts as the die, co-acting with the punch i to pierce the holes, and the work holder 4 is provided with two rows of holes 42, corresponding to the holes 52, 53 in the work piece but made of larger diameter so that they fit accurately upon the periphery of the pilot 2i. Thus, by moving the work piece along beneath the punch, and setting it successively upon the pilot, the holes will be accurately spaced and punched in the work piece. In

the cover plate 5 are holes 6! corresponding to the holes 52, 53 but somewhat larger, and these holes enable the operator to more easily locate the worker holder upon the pilot.

After the smaller holes 52, 53 have been punched, the work holder, together with the work piece and the cover plate, is transferred bodily to a second punch press which is adapted to punch the larger holes 5 i. The larger punch will, of course, have a pilot of larger diameter than that shown, and the holes 43 in the workholder are made to fit accurately thereupon, while at the same time the cover plate will have similarly enlarged openings 62. Between the face of the bushing 2 and the work holder is interposed a washer l by removing or reducing which the work holder can be lowered to compensate for sharpening of the die which is effected by grinding 011' the upper face of the pilot in the well known manner.

It will be observed from the foregoing description and by reference to the drawing that I have provided a simple and effective device for the purpose set forth in the preamble, and while I have herein shown a preferred embodiment of my invention, it will be readily un r d y those skilled in the art to which the same perto suit any particular or peculiar requirement without departing from the spirit of the inven= tion as defined in the appended claims.

For example, in Figure is. I have illustrated a modification which is adapted for use in co ju tion with a drill press. In this class of work it is customary to provide a jig having bushings on or near the upper surface of the work piece, the said bushings having an inner diameter corresponding to the size of the drill to be used. Theoretically, the location of the work piece with its supporting Jig is determined by the accurate fit of the drill in the bushing When, however, the drill is of small diameter and the weight of the Jig and the work piece relatively great, it is found that the effort required to centralize. the work causes so much lateral pressure upon the drill as to spring it out of line, thus distorting the hole and in many cases breaking the drill.

In order to overcome this dimculty, I provide a work holder or jig 4 having openings 42 adapted to fit closely upon a pilot 2| of the bushing 3 which is fixed upon the table of a drill press, and upon the work piece 5 I provide a cover plate 8A having reinforced portions 83 which serve as bushings for guiding the drill IB. It will be obvious that by setting the Jig upon the pilot in the manner shown, the bushing above it will be accurately located for the drilling or the hole 58A without imposing any strain upon the drill laterally.

Although in the embodiments of my invention above described the punch or drill is of the vertically reciprocating type, and the supporting surface such as the bolster of the punch press or the table of the drill press has a horizontal surface, itis obvious that when the device is applied to a horizontally moving drill as used in some types of screw machine, the supporting surface is positioned in a vertical plane. Also in some machines the work support is moved and the drill merely rotates.

Having thus described my said invention, what 'I claim and desire to secure by Letters Patent of tains that various changes in detail may be made 2. In a device of the character described, the combination, with a cutting tool and a worksupporting surface arranged in cooperative relation therewith, of a pilot member fixed upon said surface, a work holder havin therein a series of holes corresponding to the holes to be formed and adapted to fit successively upon said pilot, and a cover plate held in said holder above the work piece and having a corresponding series of holes adapted to facilitate the positioning of said holder upon the pilot.

3. In a device of the character described, the

combination, with a punching tool and a worksupporting surface arranged in co-operative relation therewith. of a die fixed upon said surface having thereupon a pilot member formin a unitary part therewith, and a work holder having therein a series of holes corresponding to the holes to be punched and adapted to fit successively upon said pilot.

a. In a device of the character described, the combination, with a punching tool and a worksupporting surface arranged in co-operative re lation therewith, of a die fixed upon said surface having thereupon a pilot member, a work holder having therein a series of h01es corresponding to the holes to be punched and adapted to fit successively upon said pilot, and a cover plate held in said holder above the work piece and having a series of holes adapted to facilitate the positioning of said holder upon the pilot.

5. In a device of the character described, the combination, with a drilling tool and a worksupporting surface arranged in co-operative relation therewith, of a pilot member fixed upon said surface, and a work holder having therein a series of holes corresponding to the holes to be formed and adapted to fit successively upon said pilot, said pilot being positioned below said work holder and having an opening to receive said drill and extending throughout the depth thereof so as to discharge cuttings.

6. In a device of the character'described, the combination, with a drilling tool and a. worksupporting surface arranged in co-operative relation therewith, ofa pilot member fixed upon said surface-a work holder having therein a series of holes corresponding to the holes to be formed and adapted to fit successively upon said pilot, and a cover plate held in said holder above. the work piece and having a corresponding series of holes adapted to guide said tool accurately during the drilling operation.

WALTER JAGOSZ.

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