DE509250C - Machine for the production of thumbtacks, upholstery pins, etc. like - Google Patents

Description

The invention relates to a machine for producing tacks and upholstery nails and the like, in which the ram is moved in the vertical direction and the platelets can be fed individually from the side by a slide. The known machines of this type have the disadvantage that the recessed plate to its centric position between wire and

to secure ram, lifted out of the slide through the wire end and to rest is brought to the ram; the wire must be fed back into the die a little before pressing become, which in practice does not succeed precisely enough.

The invention aims to avoid these disadvantages by providing a special lever is who the platelets through the drilling

ao tion of the slide presses through it directly onto the die.

In the drawing, an embodiment of the invention is shown, namely Figs. 1 and 2 show schematically a vertical section through the machine with different positions of the parts.

The wire α intended to form the nail shaft is fed to the die b from a supply roll from below; the wire is fed by a machine-controlled feed device c. The ram d is moved up and down in the vertical direction. A slide e sits in a guide on the table of the machine; it can be transferred from the position shown in Fig. 1 to its position according to Fig. 2, in which a hole e ^{1 of} the slide is located just above the die b . The lower part of the bore e ¹ is cylindrical and so narrow that the head plate f can only be pushed through with friction. The upper part of this hole is widened in a funnel shape to make it easier for the head plates to collapse. In the position of the slide e shown in Fig. 1, a feed channel g for the perforated or embossed head plate opens above the hole e ¹ , which is provided with a distributor device h of known design, through which only one plate at a suitable moment from the channel is released.

Furthermore, a finger-like lever k is pivotably mounted on the table of the machine and, like the wire feed, slide e and distributor h, is inevitably controlled by the machine. In its lower end position, the lever, the front end surface of which is slightly smaller than the head plate, hits the die b, while in its upper end position it releases the path for the ram d.

Finally, there is a cutting device (not shown) on the machine table known design intended for the finished nail.

The mode of operation of the machine described is as follows: In the case of the machine shown in Fig. 1

Set position of the parts, the press, punch d has reached its lower end position, in which it forms the head of the nail and at the same time connects it by riveting to the wire end protruding from the die c. The slide e is retracted, as is the cutting device for the wire and the lever k. At this moment the distributor device h of the feed chute g comes into effect, so that a head plate f falls into the funnel-shaped widening of the bore e ^1. As soon as the ram d goes up again, the wire feed device c is also put into action, so that the finished nail m follows the ram immediately. As soon as the finished nail m protrudes far enough out of the die b , it is removed from the cutting edge (not shown)

ao direction cut off; however, it mostly still remains hanging on the ridge, so that the now advanced slide e pushes it aside, where it falls through a hole or channel in the table into a container standing by.

The slide e remains due to the arrangement of an adjustable stop (not shown) with its bore e ¹ exactly above the die, so that the finger-like lever k, which now strikes down, the head plate / through the cylindrical part of the bore e ¹ up to the die b drives. The head plate arrives with its hole or its embossing exactly on the end of the wire a, the ridge of which is already somewhat upset. Then the lever k goes back to its starting position according to Fig. 1 and after it the slide <?. Finally, the press ram d comes into its position

4.0 as shown in Fig. 1 and press the nail done. The game then starts all over again.

The guide trough g can be combined with the slide e if the guide trough is mounted so that it can swing or rotate laterally at its upper end. You can also store a rotatable plate in place of the slide on the work table, which always continues to rotate in the same direction and on which several holes e ¹ are provided at the same distance from each other, between which holes of larger diameter are arranged for the passage of the ram.

Instead of making the cylindrical part of the bore e ¹ so narrow that the platelets can only be driven through with friction, the borehole can also be made so wide that the platelets fall through easily; in this case, however, a holding device for the platelets must be installed in the bore, ζ. Β. Provide three balls protruding into the hole under spring pressure, on which the platelets remain when they fall. The balls then give way to the platelets under the pressure of the lever k.

You can also provide a cross bar under the guide piece for the ram, on which two or more press rams sit on different jobs works.

The device described is particularly useful for nails, their head plates before pressing are smaller than the finished nail head. ; . ; -

Claims (2)

Patent claims: ι. Machine for the production of thumbtacks, upholstery nails and the like with a vertically acting ram and a slide that feeds the perforated or embossed head plates individually "from the side, characterized by a special lever (k) that pushes the plate through the hole (e ¹ ) of the slide (e ) presses on the die (&). 2. The slider of claim 1 having stepped bore, characterized in that the lower part of the bore (^ ¹⁾ of the slider so far that the platform can be ₀ g chen pressed only with friction. 1 sheet of drawings