US327028A - Die-holder for pi n- m ach i nes - Google Patents

Description

(No Model.)

B. SMART.

DIE HOLDER FOR PIN MACHINES. No. 327,028. Patented Sept. 29, 1885.

Momma:

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error-a EZRA SMART, OF HARTFORD, CONNECTICUT.

DIE-HOLDER FOR PIN-=IVEACHINES.

QJPECEFECATION forming part of Letters Patent No. 327,028, dated September 29, 1885.

Application filed May 3, 1985.

To aZZ whom, it may concern.-

Be it known that I, EZRA SMART, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Die-Holders for Pin- Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, where Figure l is a detail view, in elevation, of part of a pinnmking machine with my improvement attached, and showing the removable die-block in front view. Fig. 2 is a view in central vertical section through the die-block on the axis of the wire. Fig. 3 isa detail view in horizontal section through the parts of the machine on a plane passing through the center of the wire and heading-die, and dcnoted by the dotted line 5000 in Fig. 1.

My invention relates to the general class of automatic pin-making machines, and is particularly adapted for use 011 the wellknown Johnson pin-machine, although several features thereof are applicable to a similar class of machines for making bent or headed articles cut from a continuous length of wire.

It consists in the removable die-holder or block having a cut-offsocket and length-gage, the block also bearing the piirholding and heading-dies, and in the combination of the parts as more particularly hereinafter described.

My invention is described with particular reference to its use on a pin-making machine; and in the accompanying drawings, where like letters indicate the same parts throughout the figures, the letter a denotes the bed ofa pin-making machine of ordinary construction and material. 1) indicates the upright part ofthe machine, in a socket in which the removable die-block c is held, as by means of clamp-screws, in a substantially vertical position, the opening through the center of the dies, when closed, coming exactly in line with the wire-hole b through the upright arm of the machine.

Only so much of the machine is illustrated as is new or may benecessary to show the con nection between the old and new devices.

The die-block c bears holding-dies d d, the lower one of whichfjd, is clamped in position in the holder so that the wire, as it feeds (No mode through the machine, rests in the socket in its face, while the upper die, d, is longitudinally movable and is operated by means of a lever, c, to clamp or release the wire. The meeting faces of these two holdingdies are slightly countersunk on their front edge, forming an enlargement into which the projecting end of a piece of wireis upset by means of thepunch or heading die 7", which is borne in an adjustable arm, 5/, attached to the die (1. The foot of this punclrholding arm 9 has a slot, 9, through which a clamp-screw passes into the die d, and by means of this device the punch can be exactly adjusted with its axis in the path of the wire as it feeds through the machine and directly in front of the t pening between the holding-dies. This punchfhas in its face a recess of proper size and outline to form the head of the pin, and it is driven against the end of the wire, which projects slightly beyond the front face of the holding device, by means of the sliding block and cam, in the ordinary manner. This punch is thrown outward after each blow by means of the spring f, arranged between the outerend of the arm and a collar on the punch.

The die-block c has a transverse opening directly across the path of the wire, and in this opening the cut-off h slides across the wire, shearing off the length required to form a pin after this blank has been properly headed, and pushing it out of the laterally opening socket in the die-block onto the ordinary feed-screw, by means of which the pin is carried to another part of the machine, to be pointed and finished.

The method of heading a pin-blank by means of my improved device is as follows: The upper holding-die is lifted and the wire fed through until it projects slightly beyond the face of the die, which then closes upon the wire and holds it while the heading die or punch strikesit and slightly upsets it. The up per die is again lifted and the wire again fed slightly forward. It is again held by the die and a second blow struck by the heading-die. This operation is again repeated and the head completed, and the blank is then out 01f from the wire and thrust out from the die-block in the manner already described.

One of the advantages of my improvement is due to the fact that the holding-dies are backed up against the blow from the headingdie by means of a solid mass of metal in the die-block, which insures better work and greater durability of the parts. Another advantage lies in the fact that the die-block bears both the holding and heading dies and means for their adjustment, which are made before the block is secured in place in the machine so that no change is necessary after such parts arein place to work; and another advantage consists in forming the opening through the body of the die for the cut-off, which enables the latter to operate as a lengthgage in addition to its function as a cut-off.

The pushout h reciprocates with the cutoff h, being drivenfrom the same cam, and it so strikes the pin-blank at a point near the center of its length as to assist the cut-off in thrusting it onto the feed-screw. A suitable opening is made in the upright b and the die block for thepassage of the pushout.

After the screws, which pass through openings in the upright 1) into the screw-socketsc inthe back of the die-block, (see Fig. 2,) have been removed, the die-block can betaken 0d the machine by slipping it'to the right so as to clear the end of the feedscrews and then pulling up or forward. This operation is reversed in putting the die-block in place.

The opening in the die-block c for the pasadjustable heading-die secured to the block outside the holding-dies, and having the transverse cutot'f socket, in combination with the cut-off, all substantially as described.

8. In combination with the feed and die operating mechanism of a pin-making machine, the removable die-block 0, having the transverse openings for the passage of the pin-wire and cut-off h, and'bearing the holding-dies d and d, the latter bearing the adjustable arm 9, which supports the longitudinally-reciprocating heading-die f, all substantially as de-' scribed.

EZRA SMART.

. \Vitnesses:

CHAS. L. BURDETT, H. R. WILLIAMs.

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