GB2132044A

GB2132044A - A synchronous running monitor

Info

Publication number: GB2132044A
Application number: GB08328839A
Authority: GB
Inventors: Gunter Jost; Frank Bailer; Volker Mann; Walter Hertel; Matthias Uhsemann; Matthias Kohler
Original assignee: Kombinat Textima VEB
Current assignee: Kombinat Textima VEB
Priority date: 1982-12-02
Filing date: 1983-10-28
Publication date: 1984-06-27
Also published as: FR2537166A1; CS833783A1; GB8328839D0; DD212393A3; CH662369A5; CS249799B1; FR2537166B3; DE3331894A1; BE898302A; GB2132044B

Abstract

A synchronous running monitor particularly for monitoring the turning of the prisms e.g. 5 in jacquard machines, has a perforated disc rigidly connected with a prism shaft 4. In the case of a prism having five or six sides, the disc has 3 perforations, which are sensed by 3 detectors 7, giving a 3-bit binary code corresponding to a prism edge. The monitoring for complete and synchronous changing over of the individual prisms is carried out by means of a logic evaluation element. <IMAGE>

Description

SPECIFICATION Synchronous running monitor The invention relates to a synchronous running monitor particularly though not exclusively for prisms on jacquard machines.

Drawing No.4860-2201.50 of the documents relating to the Jacquard machine 4860 of the VEB Webstuhlbau, Karl-Marx-Stadt, discloses a device for monitoring the synchronous running and the complete turning of the prisms.

The device is based on a differing optical characterization of the individual prism surfaces. The prisms of the jacquard machine are disposed in a row such that one prism surface is visible in each case to the weaver.

If the prisms are not or are incompletely changed over, there is no uniform characterization of the visible prism surfaces. If this case arises, the loom must be manually stopped by the weaver.

This monitoring process depends, therefore, on subjective factors and is subject to errors, i.e. if the weaver is not paying attention damage to the jacquard machine may occur, which damage requires high expenditure for repair.

The object of the invention is to provide an improved monitor.

According to the invention there is provided a synchronous running monitor for monitoring the position of a shaft as to whether or not it is in one of a plurality of operational angular positions, comprising an initiator actuation element connected to the shaft, the actuation element having a number of actuation points which is a lesser number than the plurality of operation positions, an array of the same number of initiators as actuation points arranged for determining whether the points are in register with the initiators, the arrangement being such that a unique logical indication of register or not from the initiators identifies whether the shaft is in one of its operational positions and if so which position.

Where there are five or six operational positions three actuation points and three initiators are provided. For four operational positions two actuation points and two initiators are provided.

In particularwherethe monitor is in combination with a jacquard machine, the shaft is a prism shaft and the operational positions correspond to the operational angular positions of the prism and the actuation points are rigidly associated with the lateral edges of the prism The initiators are advantageously disposed in a fixed manner on the prism body in accordance with the prism division.

Preferably each lateral prism edge is identified with a different binary code. This binary code is at least of three figures for five or more sides of the prism. Preferably the initiator actuation elements and initiators are interchangeable.

Complete or synchronous change-over of the individual prisms may be monitored by means of a logic evaluation element.

In addition, the time of the evaluation may depend on the movement diagram of the machine.

The invention may be used in cases involving the use of jacquard machines, i.e. in weaving when the number of different binding warp threads has a greater ratio than the number of dobbies possible in tie-up jacquard machines.

To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawing, in which: Figure 1 shows a side and a plan view of a synchronous running monitor according to the in vention, and Figure 2 shows a side and a plan view of a signalling device of the monitor of Figure 1.

The synchronous running monitor of Figure 1 comprises a signalling device and a monitoring device. The former comprises an initiator actuation element, formed, as shown in Figure 2, as a perforated disc 1, fast with an adjustment ring 2 having at least one adjusting screw 3, by means of which the adjustment ring 2 may be secured on the prism shaft 4, shown in Figure 1. In the case of a prism 5 having five of six sides the perforated disc 1 has three perforations and in the case of a prism 5 having four sides it has two perforations in accordance with the prism division. The monitoring device comprises a base plate 6 on which three initiators in the case of a prism 5 having five or six sides, which are arranged, as shown in Figure 1. The initiators are proximity initiators 7 and are disposed in accordance with the prism division.The proximity initiators are disposed on the locus of the centres of the perforations in the perforated disc 1. The monitoring device, via its base plate 6, is fixed in a stationary manner by means of screws and lock nuts 9 to the prism mechanism body 8. The prism surface to be pressed is parallel to the needle field 10. The proximity initiators 7 are accurately positioned in line with the perforations of the perforated disc 1 by loosening and tightening of the lock nuts 9, in order to ensure that the synchronous running monitor is ready for use.

After each change-over of the prism 5, i.e. exactly when the prism body 8 has reached the point at which the turning process of the prism 5, in accordance with the movement diagram of the machine, is theoretically finished, the comparison of the position of the perforations of the perforated disc 1 with respect to the proximity initiators 7 takes place. The prism 5 is then exactly turned when the prism surface is parallel to the needle field 10. In Figure 1 the three perforations of the performated disc 1 are located opposite the proximity initiators 7.

For the purposes of evaluation, this position corresponds as arranged with the letter L, i.e. the first change position for all three proximity initiators 7 L, L, L. The values for the second to the fifth change-over positions are L, L, O; L, O, 0; 0, O, L and 0, L, L. The arrangement of the proximity initiators 7 is selected such that in the case of the result 0, 0, 0 the longitudinal prism edge (tip) is located with respect to the needle field 10. In this case the loom is switched off. If several jacquard machines are used on one loom the result of each change-over position must in addition be identical for all the jacquard machines in order to achieve synchronous running, i.e. to prevent pattern misalignment. If the latter is not the case the loom is also stopped.

The above described will be seen to provide a monitoring device enabling a complete change-over of the prisms, in the case of use of one jacquard machine, and an asynchronous change-over, in the case of use of several jacquard machines, to be monitored. Operating conditions are improved; an increase in fabric quality and an increase in production outputs may be achieved.

Further, the change-over process for the prisms located on the jacquard machine is monitored. A signal is triggered in the case of inadequate turning of the prisms, which leads to a stoppage of the machine. in this way pressure of the longitudinal edges (tips) of the prisms on the needle field caused by incomplete turning of the prisms and leading to damage to the needle field or to the prism is avoided. In addition, in the case of use of several jacquard machines, pressure of the prisms is prevented in the case of asynchronous changing over of the prisms of the individual jacquard machines, i.e.

pattern misalignmentforthe material.

Claims

1. Asynchronous running monitorformonitoring the position of a shaft as to whether or not it is in one of a plurality of operational angular positions, comprising an initiator actuation element connected to the shaft, the actuation element having a number of actuation points which is a lesser number than the plurality of operation positions, an array of the same number of initiators as actuation points arranged for determining whether the points are in register with the initiators, the arrangement being such that a unique logical indication of register or not from the initiators identifies whether the shaft is in one of its operational positions and if so which position.

2. A synchronous running monitor as claimed in claim 1 wherein there are five or six operational positions and these are three actuation points and three initiators.

3. A synchronous running monitor as claimed in claim 1 wherein there are four operational positions and there are two actuation points and two initiators.

4. A synchronous running monitor as claimed in claim 1, claim 2 or claim 3, in combination with a jacquard machine, wherein the shaft is a prism shaft and the operational positions correspond to the operational angular position of the prism and the actuation points are rigidly associated with the lateral edges of the prism.

5. A synchronous running monitor as claimed in claim 4, wherein initiators are disposed in a fixed manner on the prism mechanism body in accordance with the prism division.

6. A synchronous running monitor as claimed in claim 4 or claim 5, wherein each lateral prism edge is provided with a different binary code.

7. A synchronous running monitor as claimed in claim 4, claim 5 or claim 6, wherein the initiator actuation element and the initiator are interchangeable.

8. A synchronous running monitor as claimed in any one of claims 4to 7, wherein complete or synchronous changing over of the individual prisms may be monitored by means of a logic evaluation element.

9. A synchronous running monitor as claimed in claim 8, wherein the time of the evaluation is a function of the movement diagram of the machine.

10. A synchronous running monitor in combination with a jacquard machine substantially as hereinbefore described with reference to the accompanying drawings.