DE1046158B - Protection against misuse of electrical multi-hand indentation for presses, punching and slotting machines with electrical backup protection - Google Patents

Description

GERMAN

The accident prevention regulations of the trade associations stipulate that on presses, Punches, slotting machines and the like. Precautions must be taken against hand injuries, such as B. two or. Multi-hand indentations.

But they must be built in such a way that by arbitrary interventions, such as tying or clamping a lever or the like, not one hand can be freed from the engagement work. The guidelines of the commercial employers' liability insurance associations, concerning the operation of the presses, say, for example, that Two-hand engagements are to be designed in such a way that both engagement organs are released until the coupling parts are released must be operated and that they cannot be made ineffective, for example by tying them down or clamping, by actuation with the foot, knee or elbow. This requirement is so far have been solved mechanically and electrically. The mechanical solution is usually based on the fact that Both engagement organs act on a balance beam system, which when operated on one side or when used only one of the two engagement members evades, so that no transmission to the engagement linkage takes place. If an engaging element is actuated and locked in this position, it occurs during actuation of the second engagement element to jamming of the balance beam system, so that here too a transfer to the engaging linkage does not take place. Such mechanical two-hand indentations but are with regard to the engagement forces that are overcome by the hands or arms must, unpopular in large presses or even not usable. Electric two-hand indentations, at where the engagement force is provided by a magnet or an electrically controlled compressed air piston, can be used regardless of the size of the press and can easily be used for multi-hand indentations can also be used in cases where a press is used by several people must be served.

The electrical two-hand or multi-hand engagements also have the advantage that the engagement pushbuttons can be attached at any point on the machine, so that attempted bypasses are not possible.

With an electrical multi-hand engagement, would the engagement pushbuttons or switching devices simply in series with the winding of the coupling ring magnet switch, then one or more switching elements could be prevented by fixing, stipulating, etc. the press can be done with just one switching element. This type of bypass is currently through Use of contactors prevents both your own when attempting to bypass Protection against abuse

electrical multi-hand engagement

for presses, punching machines and shaping machines with electrical backup protection

Applicant:

Heinrich Schmidt,

Odenthal via Bergisch Gladbach,

In the Herzogenfeld

Heinrich Schmidt, Odenthal via Bergisch Gladbach,
has been named as the inventor

Interrupt the circuit and the circuit of the clutch magnet.

In accordance with the present invention, there is a multi-hand electrical engagement with lockup is used, which has an operating monitor in place of the otherwise usual contactors without Contacts works. This is a significant source of interference avoided and the purchase price greatly reduced. Also the subsequent equipment old, existing presses are practically possible. The mode of operation of the operating monitor is on Hand of the following five figures described in more detail.

Fig. 1 shows the engagement push buttons 1, as usual, equipped with double contacts. In the resting position they are in series with winding 2 of the operation monitor, in the engagement position in series with the Winding 3 of the coupling magnet and the contact piece 4 of the locking device switched. Of the Clutch magnet can be controlled by a press shift Pistons are replaced. Instead of the winding of the clutch magnet, the winding of the associated compressed air valve.

When switch S is switched on, winding 2 of the operating monitor receives power and pulls the Locking pin or locking bar 6 of the operating monitor against the pressure of the spring 7. The press, punch etc. is ready to work.

When both or all of the engagement pushbuttons 1 are actuated as shown in Fig. 2, the winding 3 receives the Clutch magnet current, so that the locking lever 8 is withdrawn. Now the flywheel is with

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coupled to the eccentric shaft and the rotation of the The eccentric shaft or the downward stroke of the ram begins. However, the current in winding 2 is for the duration of the actuation of the engagement push buttons 1 is interrupted, so that the spring 7 the locking pin 6 presses against the nose 9 on the locking mechanism.

If the engagement pushbuttons 1 according to Fig. 3 are released after the coupling process has been completed, so the power supply to the clutch magnet 3 is interrupted, so that the locking member 8 by the train the spring 10 returns to the locking position and the decoupling after one revolution of the eccentric shaft caused. When you let go of the engagement pushbuttons 1, winding 2 of the operating monitor receives again current, so that the locking pin 6 is withdrawn. The one sitting on the eccentric shaft Cam 11 temporarily opens contact 4 of the secondary safety device, but this has no effect. because the clutch magnet 3 has already been switched off.

When the engagement pushbuttons 1 are closed as shown in Fig. 4 have long been held in the engagement position, the cam 11 has the contact 4 of the latching device opened and the current for the clutch magnet 3 interrupted, so that the locking lever 8 in the locked position could return to stop the eccentric shaft after one revolution.

The operator control has blocked contact 4 of the secondary safety device in the open position at 6, 9, so that the engagement push buttons 1 must first take the release or rest position so that the Winding 2 of the operating monitor receives power and the lock 6, 9 of contact 4 of the look-up fuse solves.

If an engagement push button 1 is set in the engagement position as shown in Fig. 5 (bypassing the safety restriction), so the power supply to winding 2 of the operating monitor is interrupted, and the Locking pin 6 rests against 9. When the free engagement push button is pressed, the winding 3 of the clutch magnet Power is supplied and the press is engaged. Through the look-up backup or through The cam 11 is disengaged after one revolution has elapsed, but contact 4 the look-up security blocked by the operator at 6, 9 (see. Circuit diagram 4), so that to achieve further strokes the set engagement pushbutton must be released.

A bypass of the two-hand or multi-hand indentation so is not possible.

Claims (1)

Claim: Protection against misuse of electrical multi-hand indentation for pressing, punching and Slotting machines with electrical backup safety, characterized in that with the help of a electrical control monitor (2) is the contact that is inevitably controlled by the eccentric shaft (4) the locking mechanism mechanically by means of a cam (11) in the open position remains blocked when one or more engagement pushbuttons (1) remain in the engagement position. Considered publications:
German Patent Nos. 576222, 583 814;
ETZ, November 1951, issue 21. For this purpose 2 sheets of drawings © 803 698/369 12.58