US1811239A - Device for stopping electrically driven looms by the weft-guard - Google Patents

Description

June 23, 1 9 31. I ,K. LENZKES 1,811,239

DEVICE FOR STOPPING ELECTRICALLY DRIVEN LOOMS BY THE WEFT GUARD Filed Feb. 8. 1929 Patented June 23, 1931 PATENT OFFICE KARL LENZKES, F GLADBACH-NEUWERK, GERMANY DEVICE FOR STOPIPING ELECTRICALLY DRIVEN LOOMS BY THE WEFT-GUARD Application filed February 8, 1929, Serial No. 338,479, and in Germany April 17, 1928.

Weft guards have become known in looms which consist of a needle resting on the weft thread, said needle dropping as soon as a weft thread breaks and shifting then an abutment, which at the next following beating of the batten strikes against .the lever of a shaft so that this shaft is rotated and oscillates, through the intermediary of an arm, a locking lever which in its turn releases the disengaging lever so that the same is shifted through the action of a spring and stops the electromotor. It is a well known fact that owing to its inertia the loom carries out a few revolutions after the stopping of the motor so that a few wefts are laid, which have to be removed by hand to avoid defective fabric.

This invention has for its object to instantaneously stop the loom with the aid of a o weft-guard as soonv as a weft thread breaks and without the aid of mechanical brakes or the like.

. With this object in view an electromotor n with a three-pole reversing switch is used as driving engine, adapted to be switched for forwardand backward-running. The switch lever of this motor is connected to the commonly used disengaging rod with disengaging lever so that, after the releasing of the lockinglever hingedly mounted on the breast beam and designed to lock the disengaging lever, the motor is switched for a short time to backward running, said switch lever be- M ing then brought for ashort time into the cutting-out position by the action of a spring acting upon the disengaging lever, said disengaging lever being locked in this position by'a stop on the traverse. By the temporary a backward switching the motor and through the same also the loom is instantaneously stopped. The arrangement presents the further advantage that the loom can be adjusted as desired to forward or backward running,

43 in case the latter should become necessary.

An enibodiment of the invention is illustrated by way of example in the accompanying drawings in which: I

Fig. 1 is a side elevation,

Fig. 2 a front elevation and Fig. 3 a top plan view of the disengaging mechanism.

* Figs. 4 and 5 show the locking device in two different positions.

Fig. 6 shows the connection of the disengaging rod and switch.

On the batten a of the loom the weft-guard needle I) is mounted in a manner known per se so that it rests on the weft thread 0. When the weft thread 0 breaks, the needle drops and shifts, in a manner similar to that described in U. S. A. Patent 155,599, a slide d which carries an abutment e strikes against a. lever f fixed on a shaft g, said shaft being thus rotated in the direction of the arrow 5 line in Fig. 1. On the shaft 9 a second lever it is fixed which grips over a pin 21 of a locking lever m pivotally mounted on a bolt fixed in the breast beam. The breast beam has a slot n with an upwardly directed notch 70 0 (Figs. 4: and 5) with which the disengaging lever p engages. This disengaging lever is controlled by a blade spring 9 and by a pressure spring 1' and hingedly connected by a pin 6 to the disengagin rod .9. The locking lever m is controlled by a spring u. The disengaging rod 8 is hingedly connected to the switch lever a; (Fig. 6) of a three-pole revers-. ing switch to which is electrically connected to an electromotor adapted to run forward 30 I and backward. On the locking lever m a projection 02 is arranged.

The operation is as follows: When the weft thread 0 breaks, the needle 6 drops and shifts the slide d, whereby shaft 9 is rotated. The lever it shifts the locking lever m hingedly mounted on the breast beam so that by this locking lever the disengaging lever p is disengaged from the notch o of the slot at so that it suddenly oscillates under the action of spring q into the position indicated in Fig. 4:. The disengaging rod 8 is thereby shifted and oscillates the switch lever '0 from the position I into the position II (Fig. 6), wherebyv the motor is switched to backward running. The switch lever '22 remains however in this position II only during the time required for braking the loom.

At the next moment the disengaging lever 20 is partly pushed back by the action of the loo pressure spring '1, which is less strong than the blade spring 9, and the locking lever m is pulled at the same time by the action of spring u into the position shown in Fig. 5.

5 The projection 00 blocks then a portion of the slot. at so that the disengaging lever 32 is locked in the position shown in Fig. 5.

This position of the disengaging lever p corresponds to the intermediate position III of the switch lever 11, the circuit being interrupted in this position.

To make the loom run backward it necessary the locking lever m has to be pulled forward, whereby the disengaging lever 39 is brought into the position shown in Fig. 4;.

For the forward running of the loom the disengaging lever 29 is oscillated as usual to the right into the position shown in Fig. 3.

I claim:

A mechanism for stopping an electrically driven loom by the weft guard, comprising in combination, with an electrolnotor adapted to be switched for forward and backward running, a three-pole reversing switch, a switch '25 lever, a disengaging rod hingedly connected to said switch lever, a disengaging lever to which said discharging rod is hingodly con nectcd, a locking lever a strong blade spring acting on said disengaging lever from the one side, a less strong pressurespring acting on said disengaging lever from the other side, and a projection on said locking lever adapted to lock said disengaging lever in intermediate position in which the circuit to the electro- 3.3 motor is interrupted.

in testimony whereof I aflix my signature.

KARL LENZKES.

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