DE125018C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

M 125018 CLASS 7c.

G,

in front view and in Fig. 2 in

The subject of the present invention is a protective device which is suitable for all machines, with a high-speed gear, especially for drawing presses, is used and is used to an injury to the hands of the worker when inserting or ejecting the workpiece to prevent.

The device can not only be used in newly manufactured machines, but also in attached to all that are already in use.

In the accompanying drawing the new device is in its application to a drawing press shown in

Fig. Ι i Vdih
Side view.

Two two-part clamps b are screwed onto the two tie rods a, which are located at the front on both sides of the press frame, or two special rods attached at this point. A rod c, onto which a net d is wound, is rotatably mounted in these clamps. This net is held taut by an iron rod e , which is guided by forks f on the rods α , so that the net moves in one plane when rising and falling and cannot swing back and forth.

The rod c carries at one end a fixed roller g on which a thin chain or cord h is wound in the opposite direction to that of the net. This runs from here over a roller fastened to the movable table i of the press by means of a screw clamp k or in another way / and is fastened to a hook at a suitable height on the press frame.

The roller / can be arranged in such a way that it can be rotated about its vertical axis or is attached with a 'ball joint to prevent the chain from jumping out, however In many cases, a deep groove on the roller is sufficient for this.

If the table is fixed, the movement of the net is reduced by drawing presses initiated with the movable blank holder, with the other machines in a corresponding manner Way of another movable part, such as cross head, stamp, etc.

In the embodiment shown in the drawing the device works as follows:

If the table of the press is in its lowest position, the net is through the train on the chain that the role on the table performs in the companionway and the room to operate the press is completely free. Now moves at Working the press of the table with the pulley facing up will make the chain to double The length of the table stroke is released, the net weighted down by the iron bar lowers downwards and thus completely blocks access to the stamp and so on.

The fixed reel and the rod on which the net is wound are the same

Diameter, then it moves up and down at twice the speed of the press table. This ensures that when the table goes up, the dangerous space of the press is already closed off by the net before the die and punch have moved dangerously close to each other, and that when the table goes down, the net already has the space for operating the press again has given free before the table has reached its lowest position ¹ . By changing the diameter of the fixed roller, the speed of the net can be adjusted to any desired size.

To the device to external activity it is sufficient to loosen the end of the chain from the hook attached to the press frame.

Compared to other protective devices, in which a device that moves with the press and so on Grid or net is triggered at a certain moment and, suddenly, free falling down, locking the machine, the new device offers advantages in that the Movement is even and constantly faster than that of the movable parts of the machine itself. As a result, first of all, the problem cannot arise that especially with presses of larger dimensions the grid, which with larger drop heights can withstand free fall only of heavier design, even to a source the danger becomes because the network of the new device which does not fall freely and also is otherwise in no way claimed, can be carried out in a very light design. Secondly the time during which the press accessible ", extended in proportion to the stroke of the punch, so that compared to the machines equipped with the older guards increased the working speed can be.

Claims (1)

Patent claim: A protective device for machines with a moving gear, especially drawing presses, characterized in that a net (d ) is rolled up from the moving table (i) or another moving part of the machine, continuously leading the gear of the machine, onto a rod (c) and lowered . . ■ For this purpose ι sheet of drawings.