CS257930B1 - Electric stopper for jacquard weaving. machinery - Google Patents

Abstract

The electric stop of the jacquard loom, and the shifting cords with weights, connected to the electric circuit of the machine's switching device, is formed by a detection element, fixedly placed under the weights in their lowest position when the shed is open, which detection element, when in contact with the weight in the event of a break or release of the shifting cord, is a source of a control signal for changing the state of the electric circuit of the machine's switching device. The electric stop is suitable for all types of jacquard machines without a shifting counter-pull.

Description

BACKGROUND OF THE INVENTION The present invention relates to an electrical stop of a jacquard loom of a weaving machine, with shifting lines with weights connected to the electrical circuit of the machine shut-off device.

On the jacquard weaving machines, in the event of damage to the sinker, hinge, breaking of the shifting line, heald or the eyelet of the weight of the heald to the heald, there is a binding error in the fabric.

Attempts have therefore been made to mount stops on the jacquard machine that would lock immediately after. lowering the weights of the shift lines below the specified level with the machine stop shed open.

According to DE-PS 858 680 an electrical stop of the jacquard is known. machines for monitoring breaks of jacquard shifter lines. The stopper ’consists of a three-piece frame placed across the warp behind the jacquard block.

Vertical bores are formed in the middle frame part, followed by smaller bores provided in the upper thinner frame part. In the vertical bores of the central part, the lower parts of the pins are slidably mounted. on which springs are supported, which are supported by the upper end on a collar separating the electrically conductive lower portion of the pin from the upper non-conductive portion of the pin, and the lower end on an electrically conductive strip mounted on the lower side of the central portion. The pins are pushed by springs into the upper position defined by the collars. At the bottom of the gap between the middle and the lower part of the frame, another electrically conductive strip is placed, both belts being connected to the electrical circuit of the machine's shut-off device. The pins are connected to each other by a flexible wire that passes through the holes located at the top of the pins. When the machine is running smoothly, the machine's electrical circuit is disconnected.

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When the respective guide line breaks, the loose warp thread in its section compresses the wire * and hence the nearest pin, whose lower end by contacting the lower electrically conductive strip connects the electrical circuit, thereby stopping the machine.

However, the device is complex, space-consuming and suitable, rather for a thinner warp. During the processing of spun materials, operating faults can be assumed due to the dusty environment.

Further, according to DD-PS 34 474, the jacquard stop is known in the event of a breakdown or shifting cord failure. The device that cooperates with the electric or mechanical warp lamella stop consists of a reciprocating shear bar, located behind the jacquard shaft below the lower shed plane when the shed is open.

IN

In the event of a breakage or loosening of the shifting line, the respective warp thread drops into the path of the cutting bar which interrupts the thread, and by interrupting the warp thread, a warp lamella stop is actuated which stops the machine.

The disadvantage of this device, which is also more suitable for the thinner

In the warp, there is a relatively long reaction time between breaking the cord and stopping the condition. The function of the stopper is also adversely affected by the dusty environment in the region of the cutting bar.

In practice, the stoppers of the jacquard brda have not proved their worth, so that the binding errors caused by these failures are largely detected only after being visually detected by the machine operator. This fact adversely affects the quality of jacquard fabrics, especially for piece goods such as towels, towels, tablecloths, etc., where even a slight but irremovable binding defect will degrade the whole product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple and operationally reliable electrical stop for the jacquard loom even for dense warps.

Essentially, the electrical stop of the invention satisfies these conditions by providing a detecting member immobilized beneath the weights at their lowest shed open position, which detecting member is the source of a control signal when the shear is broken or the shifting cord is released. the state of the electrical circuit of the tripping mechanism of the machine.

- 5 According to a variant, the weights are connected to the electrical circuit of the cut-off device both by means of an electrically conductive loop located on a stationary frame for vertical guidance of the weights and by a detection member formed by an electrically conductive plate. the possibility of electric spark and reduced stop sensitivity ».

According to a second variant, the detecting member is a piezoelectric sensor connected through an evaluation unit to the electrical circuit of the machine shut-off device »This embodiment is' also suitable for dusty environments»

The electric circuit is advantageously connected with light signaling to alert the operator to stop the machine »

The electrical stopper according to the invention, which can be easily installed on all types of jacquard machines without shifting backwards, reliably prevents the formation of irreparable bonding errors in the fabric, thereby increasing the quality of the jacquard goods produced and saving material and labor costs, energy and capitalization and increasing the proportion of export sorting »The solution is suitable for very dense curriculum»

Exemplary embodiments of the invention are shown schematically in FIG. 1 shows a first variant of the electrical stop in a perspective view and FIG. 2 a second variant also in a perspective view »" The shifting lines (not shown) are connected to the healds 1 (Fig. 1) partially shown, on which the metal weights 2 are suspended. , vertically guided by an electrically non-conductive, preferably divided frame 2 »secured to machine sides (not shown)» An electrically conductive loop 6 is mounted on the upper edge of the frame 2 «3®, connected to the electrical circuit of the machine 2

Under the weights ₂₉ in their lowest position A when the shed is open, a detection member 6 is provided immovably and in isolation, formed in an exemplary embodiment by an electrically conductive plate 2 »connected by a line 8 to the electrical circuit of the tripping device 2j 2 <3® connected light signaling (not shown) »

In normal machine operation, the weights 2 do not touch the electrically conductive plate 2 so that the electrical circuit of the cut-off device is disconnected. When the shifting cord is broken or released, its weight 2 * drops onto the electrically conducting plate 2, thereby closing the electrical circuit with the generated control signal and shutting off the machine 2 while switching on the light signal.

Giant. 2 shows a variant of an electrical stop. Under the weights 2, in their lowest position when the shed is open, there is a detection member 6 formed by a piezoelectric sensor 2 connected by a line 10 to an evaluation unit 11 connected to an electrical circuit of a tripping device (not shown). In the exemplary embodiment, the piezoelectric sensor is formed by a sensor plate 12 connected by an outlet 15 to its own piezoelectric member 14. This sensor or its mounting is not described or illustrated in detail, since this is a common application of a known piezoelectric element.

During normal machine operation, the weights 2 do not touch the sensing plate 12 so that the electrical circuit of the shut-off device remains open. When the shifting line breaks, the released weight 2 'falls onto the sensing plate 12, creating a shock that causes the sensing plate to be transmitted by mechanical oscillations transmitted by the pin 15 to the piezoelectric member 14 itself, which converts them into control signals for connecting the electrical circuit of the machine.

The principle of the invention, expressed in point 1 of the invention, can be applied to other constructional variants of the electrical stop by known means.

Claims (3)

OBJECT OF THE INVENTION · 1. Electric zafiežfcaMaklérejcéiy? A weaving machine, connected to the electrical circuit of the loom of the weaving machine, characterized in that the electric circuit detecting member (6) of the machine is immovably mounted beneath the weights (2) in the weaving machine. their lowest after lying on an open shed. Electrical stop according to claim 1, characterized in that the weights (2) are connected to the electrical circuit of the tripping device (5) via an electrically conductive loop (4), located on a stationary frame (3) for vertical guidance of the weights (2). ) and a detection member (6) formed by an electrically conductive plate (7) is connected » Electrical stop according to claim 1, characterized in that the detection member (6) is a piezoelectric sensor (9) connected via an evaluation unit (11) to the electrical circuit of the machine shut-off device (5).