DE526018C - Machine for the production of so-called oat grain chains - Google Patents

Description

IVmachine for the production of so-called oat grain chains The invention relates to a machine for making so-called oat grain chains; these are jewelry chains, whose links consist of two U-shaped bent, offset from each other by 90 °, with their thighs are pushed together and pressed against each other limb parts.

There are machines for producing such chains are known for each Link part a separate complete set of tools, offset by 90 ° from the other contain.

According to the present invention, there is a single set of tools in the machine provided, which consists of an upper, non-rotating bending pliers and a lower, around godrehbaren bending pliers, which can be moved vertically on a common central axis are arranged, and also from a horizontally axially and vertically displaceable Bending mandrel that is at right angles to the other tools.

The machine works in the manner characterized in claim n iiiier.

The subject of the invention is shown in eleven illustrations on the drawing shown. Fig. I shows the machine in elevation.

Fig. 2 to i i show the position of the tools in the various Steps of the process.

The machine consists of the machine table a, the bearing frame b attached to it, the camshaft c mounted on its rear side. On the camshaft c sits a side cam disk d with two cams e on its control surface, on which a double lever f rests, the other end of which is articulated to the longitudinally movable clamp g of the wire feed device g, la arranged on the table a. The wire feed device is activated twice for one revolution of the camshaft. A fixed wire clamp h sits next to this movable wire cycle, and two push rods i and h act alternately on both. On the left side of the feed device g, h there is arranged a coil m which carries the material wire n guided through the feed device. At the front end of the wire feed g, la, a knife q seated at the lower end of a vertically movable slide p is arranged above an anvil seated in the same.

just the knife pusher p sits in a vertically movable slide r one upper bending pliers s with laterally pivotable legs, one downwards Enclose an open, fluted U-shape. In the central axis of the upper bending pliers s sits below the same in table a a vertically movable and rotatable by 90 ° Bending pliers t with upwardly open, also enclosing a fluted U-shape Thighs.

The lower tong can be rotated by means of a push rod which is moved back and forth by the camshaft c by means of a lever. The bearing of the lower pliers t can be designed as a gear wheel u and the push rod as a tooth punch v or the pincer bearing as a crank disk and the push rod can be articulated in this. Between the two tongs s and t is a bending mandrel w which is horizontally directed from the rear and can also be moved vertically and has a longitudinal fillet x on its underside. A stop y for the work wire n completes the tool set. The tools or their immediate drive parts are all driven by the camshaft by means of levers.

The machine works in the following way: From the wire feed device g, la first the wire n is advanced to the stop y, through the open end eyelet of the last made, still held by the pliers t member z. Then the bending mandrel w, which is guided from behind, lies from above on the wire n and with its groove x on the underside over the eyelet of the end link z (Fig. A and 3).

Then the lower tong t opens so that the finished piece of chain hangs in the wire n and is caught under the tong t, which rises a little and opens further. At this moment the wire n is cut by the knife q , the mandrel w pushes into the pliers t while closing the pliers t, so that the wire n is formed into a U-shaped wire bracket that is still open for the time being (Figs. 4 and 5). The mandrel is then pulled backwards out of the bracket, the pliers t is moved downwards with the bracket and rotated 90 °, the mandrel is raised at the back and then brought forward again and this time under the newly advanced wire 7a (Figs. 6 and 7) . Then the upper open pliers s moves down to the wire n, which is then cut off and, by reaching over the pliers s over the mandrel w while partially closing the pliers s, is initially also bent into a U-shaped bracket.

Now the limb parts held in the pliers are pushed into one another and are pressed against each other with their legs by closing the pliers s, t and so connected to each other (Fig. 8 and 9). Thereupon the lower clamp t with the new link rotated 9o ° again.

Claims (1)

PATENT CLAIM: Machine for the production of so-called oat grain chains, whose limbs consist of two identical, U-shaped curved, overlapping and with their free leg ends bent towards each other, offset by 90 ° against each other Link parts consist, characterized by one from an upper, non-rotatable Bending pliers (s) and a lower bending plier (t) that can be rotated by 9o °, which on a common Central axis are vertically movable, and at right angles to it from a horizontal axially and vertically displaceable bending mandrel (w) existing tool set whose individual tools interact in such a way that after moving the wire (n) through the last end loop (z) of an already completed one, from the lower one Bending pliers (t) held the piece of chain up to a stop (y) of the bending mandrel (w) rests on this eyelet (z) and the cut piece of wire after the lower bending pliers opened against the wire, in which now partially inserting the closing pliers under deformation in a U-shape, after which the bending mandrel goes back and the bending pliers (t) with the U-link moves downwards and around 9o ° rotates, and then the bending mandrel (w), which is in front again, moves under the again the advanced wire against which the upper tong (s) now moves forward while opening and while reaching over the bending mandrel, the severed piece of wire is converted into a U-shape, whereupon both bending pliers (s, t) close completely, the legs of the one inside the other Press the limbs together and then with the spike in the starting position to one: il return to a new operation.