CN209836456U - System for positioning broken warp threads in a loom - Google Patents

Abstract

A system for locating a broken warp thread in a loom, comprising a warp stop motion device; the warp stop motion device comprises a plurality of drop wires arranged over pairs of bars forming electrical contacts stopping the loom; a laser device that emits a laser beam in the direction of the plurality of drop wires; in the event of a breakage of the wire, the corresponding drop wire falls and comes into contact with one of the pairs of bars; characterized in that said laser means measures the distance between it and said drop wire intercepting said laser beam; the LED bars are arranged to be aligned with respect to the pair of bars; the control center switches on the light emitting diodes of the light emitting diode bars located at a distance measured by the laser device corresponding to the position of the dropped drop wire.

Description

System for positioning broken warp threads in a loom

Technical Field

The utility model relates to a system for be arranged in cracked warp of location loom.

Background

Warp stop motion (warp-stop motion) is an accessory to a loom, which is used to control each individual warp thread and to stop the loom immediately upon a thread break.

It is a basic component of a loom and has various shapes and sizes, but they all work according to the same principle: steel drop wires are hung on each warp wire; when the wire breaks suddenly, the steel drop wire drops onto the rod formed by the two steel plates, which are isolated from each other, electrically closing the circuit. The loom reads the signal and the loom stops immediately. At this point, the operator must search for the drop-off from among thousands of drop-off drops to identify the broken line. The operator then re-ties the broken thread and restarts the loom.

In each loom, there are many threads and it takes time to find a broken thread, during which the loom is at a standstill.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a system that can discern the position of cracked line automatically.

Another object is to automatically indicate the position of a drop wire that has landed.

According to the present invention, this and other objects are achieved by a system for locating broken warp threads in a loom, comprising: a warp stop motion device; the warp stop motion device comprises a plurality of drop wires arranged over pairs of bars forming electrical contacts stopping the loom; a laser device that emits a laser beam in the direction of the plurality of drop wires; in the event of a breakage of the line, the corresponding drop wire falls and comes into contact with one of said pairs of bars; characterized in that said laser means measures the distance between it and said drop wire intercepting said laser beam; the light emitting diode bars are arranged in alignment with respect to the pair of bars; the control center switches on the light emitting diodes of the light emitting diode bars located at a distance measured by the laser device corresponding to the position of the dropped drop wire.

Preferably, the system comprises a support structure provided at the heads of said pairs of rods; a length adjustable guide post secured to the support structure; two cross bars are fixed to the ends of the guide posts; two guides are fixed to the two cross bars and arranged perpendicular to the pairs of bars; the carriage being able to travel along the two guides; the carrier supports the laser device.

Preferably, the carriage is movable on command by an electric motor.

Preferably, the electric motor is located at one side of one of the two crossbars and moves the carriage along the guide by operating a belt which rotates about a pulley located on the other of the two crossbars.

Preferably, the carriage is movable on command by a linear actuator.

Preferably, the length of the guide post can be adjusted by sliding the guide post and locking the guide post with a tightening knob.

Preferably, the laser device emits a laser beam in the direction of the dropped drop wire; the laser device receives the reflected laser beam and calculates the distance between the laser device and the falling drop wire.

Preferably, the system comprises one light emitting diode on the clip for each of the pairs of bars indicating the pair on which the dropped drop wire falls.

Preferably, the system comprises a plurality of laser devices, one for each row of the loom.

Preferably, the control center shows on a display a distance corresponding to the position of the dropped drop wire. This solution offers various advantages with respect to the solutions of the known art.

The breakage of a warp causes the drop wire that it supports to fall, short-circuiting the two plates forming the row and stopping the loom. Simultaneously, the light-emitting diodes in the region of the row concerned start to operate. According to the invention, the laser starts its scanning action, identifies the row in which the drop wire has landed and evaluates the distance of the landed drop wire from the reference point. Once it has identified the distance, it converts it into an electrical signal which is sent to a light-emitting diode bar arranged along the horizontal development of the warp stop motion device. The leds next to the falling drop wire will then start to operate.

Using the row-related leds and the intersection of the leds on the led bar, the operator can then easily and more quickly identify the location where the wire has broken.

The laser device and the LED bar can also replace an electronic board to adapt to the installed warp stop motion device.

Failure or breakage of the laser device does not affect the operation of the warp stop motion device, which can be used in a conventional manner.

Drawings

The features and advantages of the invention will be apparent from the following detailed description of practical embodiments of the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:

figure 1 schematically shows a part of a warp stop motion device according to the invention, seen in perspective view and from a first side; and

fig. 2 schematically shows a part of a warp stop motion device according to the invention, seen in perspective view and from the second side.

Detailed Description

With reference to the figures, the warp stop motion device 10 according to the present invention comprises a plurality of drop wires 11 suspended on a wire 19, arranged above a plurality of pairs of rods 12 or rows (rank) forming the electrical contacts stopping the loom.

At the head of warp stop motion device 10, and therefore of the pairs of bars 12, there is provided a pair of support structures 13 supporting the pairs of bars, one on each side.

Two length-adjustable guide posts 14, which are locked by fastening knobs 15, are fixed to the support structure 13.

Preferably, the two guide posts 14 are located outside and below the pairs of rods 12.

A respective cross bar 16 is fixed at the ends of the two guide posts 14 in the same direction as the bar 12.

Two guides 17, on which the carriage 18 runs, are fixed to the two crossbars 16.

The guide 17 is arranged perpendicular to the pairs of rods 12.

The carriage 18 can be moved on command by an electric motor 20 arranged at one side of one crossbar 16, the electric motor 20 moving a belt 21, the belt 21 rotating about a pulley 22 arranged on the other crossbar 16.

The carriage 18 supports a laser device 23 which emits a laser beam 24 in the same direction as the pair of bars 12.

The laser device 23 is also capable of receiving a returning laser beam reflected by an object intersecting the laser beam and calculating the distance between the laser device and the object.

In this particular case, the laser beam 24 is transmitted towards the drop wire 25 that has landed due to the breakage of the respective line, and the laser device 23 receives the reflected laser beam and calculates the distance between the laser device and the landed drop wire 25.

The laser device 23 is capable of performing stable distance recording in an interval between 0.06 and 5 m.

Warp stop motion device 10 further comprises a light emitting diode bar 30 arranged parallel to the pairs of bars 12.

The light emitting diode bar 30 comprises a plurality of light emitting diodes arranged at a distance of e.g. 30mm from each other.

These leds 30 indicate the position in which the drop wire has fallen.

Warp stop motion device 10 further comprises a series of light emitting diodes 31 arranged on clamps 33 associated with lateral support structures 13 of pairs of bars 12: one for each pair of bars, indicating the row on which the drop wire 25 has landed.

The carriage 18 and the laser device 23 may be height-adjustable so as to adapt to various types of drop wires (from longest to shortest) and position themselves at the height of the falling drop wire. The adjustment is made by sliding the laser device over the guide post 14 and fixing its height by the tightening knob 15.

The laser device 23, the motor 20, the led bar 30 and the series of leds 31 are controlled by an electronic board having the function of a control center arranged, for example, inside a fixture 33. The board is programmable and therefore provides a wide range of customizations.

The operation of the invention will be apparent to those skilled in the art from what has been described and in particular will be described below.

During the installation phase, the height of the laser device is adjusted by means of the guide column 14 so that the laser beam emitted by the laser device 23 intercepts the dropping drop wire 25. The knob 15 is then tightened. Any adjustment means in the three axes is also adjusted for greater tracking accuracy.

In the event of breakage of the thread, the relative drop wire 25 drops onto the pair of bars 12, establishing an electrical contact between them, stopping the loom and starting the operation of one of the series of light-emitting diodes 31 arranged on the lateral clamp 33, indicating the row in which the thread has broken.

At this point, the electronic control board operates the motor 20, sliding the carriage 18 and therefore the laser device 23 along the guides 17, until the laser device 23 receives a return signal (since it has crossed the drop wire 25).

The control centre measures the distance between the laser device 23 and the falling drop wire 25 and then switches on the light emitting diode 32 (determined as it is located at the distance measured by the laser device 23) arranged at or near the position of the falling drop wire 25.

The position of the turned-on light emitting diode of the series of light emitting diodes 31 provided on the jig 33 is made to intersect the position of the turned-on light emitting diode 32 of the light emitting diode bar 30, and the operator immediately recognizes the position of the landed dropper 25.

Alternatively or in combination, the display of the location of the rupture may also be highlighted by other means, for example on a hand-held computer, on the console of the loom or on a suitable display.

Movement of the carrier 18 may be accomplished by other methods, such as screw-nut, electric, hydraulic, or pneumatic linear actuators.

Finally, the application may be provided with a laser device for each row and will therefore not have a movement device for the laser device.

Claims (10)

1. A system for locating a broken warp thread in a loom, comprising a warp stop motion device; the warp stop motion device comprises: a plurality of drop wires arranged over pairs of rods that form electrical contacts that stop the loom; a laser device that emits a laser beam in the direction of the plurality of drop wires; in the event of a breakage of the wire, the corresponding drop wire falls and comes into contact with one of the pairs of bars; characterized in that the laser device measures the distance between the laser device and a dropper cutting off the fall of the laser beam; the light emitting diode bars are arranged to be aligned with respect to the pairs of bars; the control center switches on the light emitting diodes of the light emitting diode bars located at a distance measured by the laser device corresponding to the position of the dropped drop wire.

2. The system of claim 1, comprising a support structure disposed at the heads of the plurality of pairs of rods; a length adjustable guide post secured to the support structure; two cross bars are fixed to the ends of the guide posts; two guides are fixed to the two cross bars and arranged perpendicular to the pairs of bars; the carriage being able to travel along the two guides; the carrier supports the laser device.

3. The system of claim 2, wherein the carriage is movable on command by an electric motor.

4. A system according to claim 3, wherein the electric motor is located at one side of one of the two crossbars and moves the carriage along the guide by operating a belt which rotates about a pulley located on the other of the two crossbars.

5. The system of claim 2, wherein the carriage is movable on command by a linear actuator.

6. The system of claim 2, wherein the length of the guide post is adjustable by sliding the guide post and locking the guide post with a tightening knob.

7. The system of claim 1, wherein the laser device emits a laser beam in the direction of the dropped drop wire; the laser device receives the reflected laser beam and calculates the distance between the laser device and the falling drop wire.

8. The system of claim 1, comprising one light emitting diode on the fixture for each of the plurality of pairs of bars indicating the pair on which the falling drop wire falls.

9. The system of claim 1, comprising a plurality of laser devices, one for each row of the loom.

10. The system of claim 1, wherein the control center shows a distance on a display corresponding to a position of the landed drop wire.