GB2123140A

GB2123140A - Optoelectronic device for scanning weft or warp yarn

Info

Publication number: GB2123140A
Application number: GB08313980A
Authority: GB
Inventors: Juraj Spisiak; Miloslav Bezdek; Stanislav Lev
Original assignee: VYZK VYVOJOVY USTAV; ZVS Vyzkumnevyvojovy ustav
Current assignee: VYZK VYVOJOVY USTAV; ZVS Vyzkumnevyvojovy ustav
Priority date: 1982-06-21
Filing date: 1983-05-20
Publication date: 1984-01-25
Also published as: IT1167437B; GB8313980D0; FR2528882B1; ES8404432A1; IT8348432A1; DE3319572A1; IT8348432A0; CH662422A5; ES522995A0; FR2528882A1; CS227478B1; GB2123140B

Abstract

An optoelectronic reflecting device for scanning weft or warp yarn in which fibre (13) passing through a zone (5) adjacent a transparent scanning plate (4) is scanned by reflection of an infrared light ray from a source (6), which is detected by a receiver (7), advantageously a photo transistor, which converts the optical signal into an electrical signal, which is transmitted, after amplification to a light source emitting an optical signal. The scanning plate (4) is preferably wiped by the scanned fibre (13). The electrical signal may be passed to other circuits for assessing the fibre passage through the scanning zone (5). The device is useful for scanning weft or warp yarn, particularly for multished textile machines, scanning yarn in flat knitting machines, scanning holes, streaks and needle latches in knitting machines. <IMAGE>

Description

SPECIFICATION Optoelectronic device for scanning weft or warp yarn The present invention relates to an optoelectronic device for scanning weft or warp yarn.

In textile machines, a continuous supervision of machine operation correctness is necessary, this being connected with signalling machine breakdown, ora disturbance in the fabric. Therefore, it is necessary, particularly in multished weaving machines, to perform continual weft yarn scanning. This is performed hitherto, according to the present state of art, by means of a scanner connected to an electronic circuit in the distributor.

The disadvantage of the present state of art consists in thatthe electronic circuitry ofthe known scanner is very expensive and demanding both in dimensions and components.

The reliabilityofthe known circuit is not high and, moreover, it is necessaryto readjust during its operation at least the sensitivity upon changing the weft parametersorthe yarn thickness.

Afurtherdisadvantage of known devices is that the scanning ofdamagedyarns in flat knitting machines is performed by means of an electromechanical latch and is insensitive towards certain yarns. The scanning of damaged knitting needle latches is performed exclusively by mechanical means.

The above disadvantages ofthe present state of art are mitigated to a considerable extent by the optoelectronic reflecting device for scanning weft warp yarn according to the present invention, which comprises a mounting which is provided with an approach surface leading to a transparent scanning plate, an infra red radiation source and an infra red receiver arranged to receive radiation from the source said receiver being connected to an amplifier and thence an indicating circuit, connected to a light source the indicating circuit being such as to cause the light source to indicate passage of an objectacrossthe scanning plate.

The advantage ofthe optoelectronic reflecting device for scanning weft oryarn according to the present invention is low capital expenditure, low demand for components, and small dimensions. The scanning is performed optoelectronically, which is reliable and need not be readjusted during operation.

Moreover, the transparent deflector is not contaminated, because it is preferably continuously wiped by the fibre being checked sliding across it.

An optoelectronic reflecting deviceforscanning weft or warp yarn according to the present invention is described by way of example with reference to the accompanying drawings which show in: Fig. 1 -- represents a diagramatic arrangement of the scanning part ofthe device, and Fig.2-a block diagram of the wiring ofthe electronic part of the device.

A mounting block 1, which secures both the thermal and the mechanical stability of the device components mounted therein, is provided at one of its ends with and approach surface 2 with a projection or claw 3 at its end. Below projection 3 isfixed atransparent scanning plate 4, advantageously made of glass. In front of the scanning plate 4 is a scanning zone 5.

Inside block 1, an infra red radiation source 6 and a receiver7 for infra red radiation reflected from an object in zone 5 are mounted at a predetermined angle. The output of receiver 7 is connected to the input of an amplifier 8, the output of which is connected via an intermittent link 9 to the input of an inverter 10, the output of which is connected to the input of an indicating circuit 11. The output of the indicating circuit 11 is connected to a light source 12 and to circuits watching the passage moment ofthe object to be scanned (not represented).

In operation,fibre 13 slides along the approach surface 2, or possibly claw 3, and thereafter along the scanning glassplate 4 in scanning zone 5. The infra red radiation source 6 emits infrared light, which is reflected in the scanning zone Sfrom fibre 13. The reflected light is directed to the receiver 7, the receiver recording the fibre passage through zone 5 as a light flash, and changing itto an electric signal indicating fibre passage.

The spatial relationship ofthe infra red radiation source 6 and the receiver 7, as well as relationship of the plane of the scanning plate 4, is such, as to prevent the light reflected from the scanning plate 4 from being received by the receiver 7. The electric signal is transmitted from the receiver 7, which is advantageously a photo transistor, to the amplifier 8 and via intermittent link 9, which eliminates from the signal the d.c. component, and transmits the modified signal via inverter 1 Oto the indicating circuit 11, from the output of which the light source 12 is fed, which serves as an optical indicator ofthe weft passage through the scanning zone 5.The same output signal is then transmitted to other (not shown) circuits for assessing the passage offibre 13 through the scanning zone 5.

The present invention can be advantageously applied to scanning weft or warp yarn, particularly in multished textile machines, forscanning yarn in flat knitting machines, for scanning holes, streaks and needle latches in knitting machines.

1. An optoelectronic device for scanning weft or warp yarn, comprising a mounting which is provided with an approach surface a transparent scanning plate, an infra red radiation source and an infra red receiver arranged to receive radiation from the source the receiver being connected to an amplifier and thence to an indicating circuit connected to a light source, the indicating circuit being such asto cause the light source to indicate passage of an object across the scanning plate.

2. A device according to Claim 1 wherein a projection is arranged between the approach surface and scanning plate to prevent a fibre or the like passed from the approach surface to the scanning plate from returning to the surface.

3. A device according to Claim 1 and 2 wherein the receiver amplifier is connected to the indicating circuit

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Optoelectronic device for scanning weft or warp yarn The present invention relates to an optoelectronic device for scanning weft or warp yarn. In textile machines, a continuous supervision of machine operation correctness is necessary, this being connected with signalling machine breakdown, ora disturbance in the fabric. Therefore, it is necessary, particularly in multished weaving machines, to perform continual weft yarn scanning. This is performed hitherto, according to the present state of art, by means of a scanner connected to an electronic circuit in the distributor. The disadvantage of the present state of art consists in thatthe electronic circuitry ofthe known scanner is very expensive and demanding both in dimensions and components. The reliabilityofthe known circuit is not high and, moreover, it is necessaryto readjust during its operation at least the sensitivity upon changing the weft parametersorthe yarn thickness. Afurtherdisadvantage of known devices is that the scanning ofdamagedyarns in flat knitting machines is performed by means of an electromechanical latch and is insensitive towards certain yarns. The scanning of damaged knitting needle latches is performed exclusively by mechanical means. The above disadvantages ofthe present state of art are mitigated to a considerable extent by the optoelectronic reflecting device for scanning weft warp yarn according to the present invention, which comprises a mounting which is provided with an approach surface leading to a transparent scanning plate, an infra red radiation source and an infra red receiver arranged to receive radiation from the source said receiver being connected to an amplifier and thence an indicating circuit, connected to a light source the indicating circuit being such as to cause the light source to indicate passage of an objectacrossthe scanning plate. The advantage ofthe optoelectronic reflecting device for scanning weft oryarn according to the present invention is low capital expenditure, low demand for components, and small dimensions. The scanning is performed optoelectronically, which is reliable and need not be readjusted during operation. Moreover, the transparent deflector is not contaminated, because it is preferably continuously wiped by the fibre being checked sliding across it. An optoelectronic reflecting deviceforscanning weft or warp yarn according to the present invention is described by way of example with reference to the accompanying drawings which show in: Fig. 1 -- represents a diagramatic arrangement of the scanning part ofthe device, and Fig.2-a block diagram of the wiring ofthe electronic part of the device. A mounting block 1, which secures both the thermal and the mechanical stability of the device components mounted therein, is provided at one of its ends with and approach surface 2 with a projection or claw 3 at its end. Below projection 3 isfixed atransparent scanning plate 4, advantageously made of glass. In front of the scanning plate 4 is a scanning zone 5. Inside block 1, an infra red radiation source 6 and a receiver7 for infra red radiation reflected from an object in zone 5 are mounted at a predetermined angle. The output of receiver 7 is connected to the input of an amplifier 8, the output of which is connected via an intermittent link 9 to the input of an inverter 10, the output of which is connected to the input of an indicating circuit 11. The output of the indicating circuit 11 is connected to a light source 12 and to circuits watching the passage moment ofthe object to be scanned (not represented). In operation,fibre 13 slides along the approach surface 2, or possibly claw 3, and thereafter along the scanning glassplate 4 in scanning zone 5. The infra red radiation source 6 emits infrared light, which is reflected in the scanning zone Sfrom fibre 13. The reflected light is directed to the receiver 7, the receiver recording the fibre passage through zone 5 as a light flash, and changing itto an electric signal indicating fibre passage. The spatial relationship ofthe infra red radiation source 6 and the receiver 7, as well as relationship of the plane of the scanning plate 4, is such, as to prevent the light reflected from the scanning plate 4 from being received by the receiver 7. The electric signal is transmitted from the receiver 7, which is advantageously a photo transistor, to the amplifier 8 and via intermittent link 9, which eliminates from the signal the d.c. component, and transmits the modified signal via inverter 1 Oto the indicating circuit 11, from the output of which the light source 12 is fed, which serves as an optical indicator ofthe weft passage through the scanning zone 5.The same output signal is then transmitted to other (not shown) circuits for assessing the passage offibre 13 through the scanning zone 5. The present invention can be advantageously applied to scanning weft or warp yarn, particularly in multished textile machines, forscanning yarn in flat knitting machines, for scanning holes, streaks and needle latches in knitting machines. CLAIMS

3. A device according to Claim 1 and 2 wherein the receiver amplifier is connected to the indicating circuit via an intermittent link and an inverter.

4. An optoelectronic reflecting device for scanning weft or warp yarn, comprising a mounting which is provided with an approach surface with a projection at its end, belowwhich is mounted a transparent scanning plate, an infra red radiation source and an infra red receiver arranged to receive radiation from the source mounted at a predetermined angle to the radiation source,the receiver being connected to an amplifier which is connected via an intermittent link to an inverter,which in turn is connected to an indicating circuit connected to a light source.

5 An optoelectronic reflecting device for scanning weft or warp yarn substantially as described with reference to the accompanying drawings.