US1735780A - Punching attachment for presses - Google Patents

Description

Nov. 12, 1929. w. H. NICKERSONI 1,735,780

PUNCHING ATTACHMENT FOR PRESSES Filed Dec. .14. 1927 mun Patented Nov. 12, 1929 1 UNITED sr v WILLIAM nicxnnsoiv, or NEWTON, MASSACHUSETTS IPUIN'GI-IING ATTACHMENT non PREssEs Application filed December l l, 1927. Serial-N0. 239,897.

part of this specification, V

Figure 1 is a side view of a punching attachment embodying the invention, separated from a press, portions at one end of the l attachment being shown insection.

Figure 2 is an end view ofthe attachment.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 shows an end view of the attachment and sectional views of portions of a V 1s a compound guide forming, wlth the base,

press bed and platen between which the attachment is interposed. I

Figure 5 is a perspective view of one of the V male punch member holders.

the compound guide hereinafter described.

Figure 7 is a fragmentary. sectional view, showing the coaction of the punch members.

Figure 8 is a View similar to Figure 6, showing a modification.

The same reference characters indicate the same parts in all of the figures.

In the drawings, my improved attachment 46 shown separately by Figures 1, 2 and 3, in-

cludes a base 12, which is a metal plate or block, separably attachable to a bed 13 of a press, and a head 14, which is a metal plate or block, adapted to bear separably on the 5 platen 15 of the press.

W56 separably attaching the base to the platen,

Of the accompanying drawings forming a.

Figure 6 shows in perspective portions of from the strlp.

so that different attachments embodying the invention may be used interchangeably.

The bed 13 shown by Figure 4, is provided with a seat 16, on which the base 12is seated, and ears 17 and 18 at opposite edges ofthe seat. The'ear 18 is undercut and engages a beveled side face of the base. The ear 17, is provided with set screws 19, engaging the opposite side face ofthe base, the arrange ment being such that the base'may be removed from the bed when theset screws are loosened. When the platen 15 is raised, it is separated fromthe bed sufficiently topermit' the interposition of the attachment'betwee'n the bed and platen. v

The base 12' is provided with female punch members 20, of which there'are three in this instance, arranged in tandem order, saidmenr' bers being inserted in vertical sockets 21,

formed for their reception in the bed." Outlets 22 are provided below thesoc kets for the escape of blanks punched from a work strip 24 (Figure-4) positioned above the punch members 20.; y

Attached 'to the upper surface of the base a horizontal-channel 26, adapted to horizontally'guide the work strip and prevent .upward displacement thereof when the male punches, described later, are withdrawing The compound guide is preferably 001m posed: of two parallel members 25 (Figure 7 6), attached edge to edge to'thebase by screws, andprovided with offsetinner edge portions 250, forming the sides and top of the channel 26; In the edge portions 250.

are formed a-plurality of pairs of substan- I tially semicircular recesses'collectively constituting vertical guide openings 251, of which there are three in this instance, said openings communicating with the channel 26 and being adapted to vertically guide the holders of the male punches described later.

' the base, I provide stop means, preferably.

Any suitable means may be provided for guiding the head 14 in a predetermined path relative to the base, and maintaining the head parallel with the base, such means being preferably embodied in studs 27, fixed as by set screws 28 to the head, and slidable in guiding orifices 29 in the base.

To support the head yieldingly retracted from the base, I provide means, preferably embodied in springs 30, interposed between the base and head v and surrounding thestuds 27.

To limit the retractionof the head from the set screws on the members 34. i The holders are arranged to enter and be guided by the guiding openings 251, as shown by Figure: 7, when the head is projected. The

punch members 34 have a limitedprojection from the holders 36, andare guided-by the holders and the guiding openings 251 in exact alinement with the female member 20, so that there is no liability of misalinement,

the limited projection of the male members from the holders preventing liability of lateral displacement of said members.

The stop members 31 are, in this instance,

7 formed to extend across the ends of the com:

pound guide, and provided with orifices 40,

through which the work strip 24 is movable.

It will now be seen that an attachment having 7 a predetermined arrangement of punch members may be quickly and conveniently removed from a press, and'another -having a different arrangement of punch members substituted therefor, the vertical movement of the press platen being such that each descent ofthe platen'causes the coaction of thepunch members.

Figure 4 shows auxiliary means cooperating with the springs-30 to retract the head 14, and prevent the male punch members from sticking in the work strip, said means comprising a' lever 41, tulcrumed at 42 to a fulcrum member 45, attachable as by screws 46qto the press bed, one arm of the lever bearing onthe head, and a spring 43, fixed atone end to the other arm, and at its opposite end to a fixed holder-44, the arrangement being such that the spring is tensioned by the descent of the platen, and acts to retract the head when the platen rises. The-lever, the

ulcrummember, and the spring. 43, consti-v tute an element of the attaclmient which, may

be connected with the press bed, after the base 12 is attached to the bed.

I claim:

A punching attachment insertib-le as unit between the bed and platen of a press, and comprising a base adapted for separable attachment to a press bed, and provided with female punch members. and with means for guidingand positioning a work strip relative to saidmembers, a head adapted to bear separably-lon a press platen and be projected thereby andprovided with male punch members 'complemental to the female members,

springs interposedbetween the base and head and normally holding the head retracted from the base, complemental; stop: members on the base and head, limiting the retraction of the head, the base, and head being provided with complemental members for guid the head, and auxiliary means, for re tracting. the head, sa d means including a fulcrum member adapted to be. secured to a press bed, a two-armed, leverifulcrrimed to said member, and a spring connected with one arm of the lever and with a fixed holder,

ano pressing the. other arm against the head.

In testimony whereof I have.afh'xed my signature. WZILLIAM H, NIOKERS'QN.

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