US2768687A - Edelson - Google Patents

Description

H. EDELSON 2,768,687

PUNCH AND DIE Oct. 30, 1956 Filed April 6. 1954 United States Patent PUNCH AND DIE Harold 'Edelson, Roselle, N. 3., assignor to Western Elec= tric Company, Incorporated, New York, N. Y., a corporation of New York Application April 6, 1954, Serial No. 421,344-

3 Claims. (Cl. 164-59) This invention relates to punch and die units for punch presses and more particularly to the stock measuring means therefor.

In punch and die units employed for punching formations in stock and cutting predetermined lengths therefrom between intermittent feeding movements of the stock to the units, the conventional stops or stock measuring elements have associated mechanisms, usually operated in timed relation with the punch or ram of the press, to move the stops or elements into and out of measuring positions. These measuring elements and their operating mechanisms require, not only accurate initial setting but occasional checking and possible re-adjustment to assure accuracy of continued operation.

The object of the invention is a punch and die unit embodying a fixed stop or measuring element.

With this and other objects in view, the invention comprises a punch and die unit for a punch press wherein a passageway is provided in the die portion of the unit capable of guiding stock accurately to the punch and die under the control of a fixed stop and permitting the punched parts to by-pass the stop while being ejected from the die portion of the unit.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawing, wherein:

Fig. 1 is a front elevational view of the punch and die unit mounted in a punch press;

Fig. 2 is an enlarged horizontal sectional view taken along the line 22 of Fig. 1 illustrating the location of the stock at the completion of the punching operation;

Fig. 3 is a view similar to Fig. 2 illustrating the ejection of a punched part during the next feeding movement of the stock; 1

Fig. 4 is a fragmentary side elevational view of one of the punch and die portions, and

Fig. 5 is a top plan view of a part punched from the stock.

Referring now to the drawing, attention is directed first to Fig. 1 which illustrates the punch and die unit indicated generally at with a die portion 11 mounted on a bed 12 of a punch press and a tool holder 14 supporting punches 15 and 16 mounted in a ram 17 of the press. The punch 15 in the present embodiment of the invention has an end of a contour to form an opening 18 in a part 19, while the punch 16 is of the general contour shown in Figs. 1 and 4 but having cross-sectional contours as shown in Figs. 2 and 3. The punch 16 has leg portions 29, adapted to straddle stock 21 from which the parts 19 are to be cut, and cutting edges 22, one of which is in a plane at right-angles to the stock as shown in Fig. 2, while the other is disposed at an angle with respect thereto.

The die portion 11 of the unit is formed of various members including a main member 25 which is mounted directly on the base 12 and provided with die cavities or openings 26 and 27 for the dies 15 and 16 respec- 2,768,687 Patented Oct. 30, 1956 ice tively. The conventional means or openings may be provided in the bed 12 for the scrap parts to pass through. A stripper plate 28 has openings 29 and 30 for the punches 15 and 16 respectively. The stripper plate is provided with suitable openings for machine screws 32 for securing to the main member 25.

Members 34, 35 and 36 together with a stop or measuring element 37 are interposed between the main member 25 and the stripping member 28 and are secured in place by the machine screws 32. 'If desired, additional screws may be provided for the stop or measuring element 37 and the apertures for the screws in this element maybe elongated for longitudinal adjustment of the element. The outer surfaces of the members 34, 35 and 36 'conform somewhat to the adjacent edges of the main member 25, but the inner surfaces thereof are'formed to assure accurate guiding of the stock 21 to the punches and die cavities, yet permit the punched part 19 to by-pass'the stationary stop or measuring element 37. Therefore, the member 35 has surfaces 38 and 39 lying in the same plane and parallel with surfaces 40 and 41 of the member 34. These surfaces cooperate with each other to assure accurate guiding of the stock to the punches and die openings controlled by the element 37, particularly the tapered or diagonal surface *43 thereof. The inner surface 44 of the member 36' is in a plane with surfaces 38 and 39, while the members 34 and 35 have surfaces 45 and 46 positioned away from the path of the stock whereby the punched part 19 may turn out of the general path of the stock 21 to by-pass the element 37 during the next feeding operation of the stock.

Considering now the operation of the punch and die unit it will be understood that the ram 17 is reciprocated intermittently through its successive operating cycles and while the press is open, holding the punch and die unit in the open position the stock 21 may be fed manually or mechanically into the die unit until a forward corner of the stock engages the surface 43 of the measuring element 37. After the feeding operation, the punching operation is performed, perforating the leading end of the stock with the punch 15, while the die 26 shears the part 19 from the stock to provide a tapered end 48 and squares the next leading end of the stock. When the press opens again, moving the punch portion of the unit into open position, the stock 21 may be advanced (as shown in Fig. 3). At the start of this advancement of the stock, when the new leading end thereof engages the trailing end of the part 19, the forward corners of the part will be permitted to ride on the inclined surface 43 and to swing about the element 37 by the contour of the passageway leading from the die opening so that each feeding movement of the stock serves to eject the part previously punched therefrom. By this means of ejecting the punched parts it is possible to employ a fixed stop or measuring element.

It is to be understood that the above described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. In a punch press, a punch, a die having a die opening, cooperating with the punch to out parts successively from leading ends of strip stock, and a passageway for the strip stock having portions leading to and from the die opening, a stop member mounted in the die a given distance from the die opening and having a work impinging and work deflecting surface thereon extending into the portion of the passageway leading from the die opening, the portion of the passageway leading to the die opening being restricted in cross-sectional contour to substantially the cross-sectional contour of the strip stock to restrict the strip stock to only longitudinal movement into impinging engagement with the surface of the stop, and the portion of the passageway leading from the die opening being widened away from the stop to allow the surface of the stop to deflect the successively cut parts laterally free of the stop and out of the die.

2. In a punch press, a punch, a die having a die opening, cooperating with the punch to cut parts successively from leading ends of strip stock, and a passageway for the strip stock having portions leading to and from the die opening, a stop member mounted in the die a given distance from the die opening and extending into the portion of the passageway leading from the die opening, the portion of the passageway leading to the die opening being restricted in cross-sectional contour to substantially the cross-sectional contour of the strip stock to restrict the strip stock to only longitudinal movement into engagement with the stop, and the portion of the passageway leading from the die opening being widened away from the stop to allow movement of the successively cut parts laterally free of the stop and out of the die, the stop having a surface disposed with respect to the strip stock to be engaged by the successive leading ends of the stock and to deflect the successive parts laterally around the stop into the widened portion of the passageway as the stock advances toward the stop.

3. In a punch press, a punch, a die having a die opening, cooperating with the punch to cut parts successively 30 from leading ends of strip stock, and a passageway for the strip stock having portions leading to and from the die opening, a stop member mounted in the die a given distance from the die opening and extending into the portion of the passageway leading from the die opening, the portion of the passageway leading to the die opening being restricted in cross-sectional contour to substantially the cross-sectional contour of the strip stock to restrict the strip stock to only longitudinal movement into engagement with the stop, and the portion of the passageway leading from the die opening being widened away from the stop to allow movement of the successively cut parts laterally free of the stop and out of the die, the stop having a surface disposed with respect to the strip stock to be engaged by the successive leading ends of the stock and to deflect the successive parts laterally around the stop into the widened portion of the passageway as the stock advances toward the stop, the side of the portion of the passageway, leading from the die opening, between the die opening and the stop member being widened to cooperate with the portion thereof which is widened away from the stop to free the successive parts to be turned laterally by the stop to move out of the die.

References Cited in the file of this patent UNITED STATES PATENTS 458,531 Fish Aug. 25, 1891 FOREIGN PATENTS 159,723 Great Britain Mar. 10, 1921

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