CZ298600B6 - Device for picking weft through weaving machine shed - Google Patents

Abstract

The present invention relates to a device for picking a weft through a weaving machine shed, said device comprising a weft thread (5) supply, means for guiding the weft thread (5), a weft brake (4), means for weft thread (5) break, and means for imparting kinetic energy to the weft thread (5). Said means imparting kinetic energy to the weft thread (5) comprise a rotary disk (2) coupled with a drive (1) and a rotary snub pulley (3) reversibly adjustable between a position in which said snub pulley (3) is pressed against the disk (2) and a position in which said snub pulley (3) is moved away from the disk (2), whereby the weft thread (5) path passes between the disk (2) and the snub pulley (3) and at least the snub pulley (3) and the weft brake (4), situated during the shed in the direction of the weft thread movement (5) in front of the disk (2), are coupled with a control device (15).

Description

Equipment for weft picking through shed weaving machine

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for weft insertion through a weaving machine comprising a weft yarn supply, weft yarn guiding means, a weft brake, weft yarn interruption means and means for imparting kinetic energy to the weft yarn.

BACKGROUND OF THE INVENTION

Weaving on weaving machines with a needle, gripper or jet weft picking machine is known. The drawback of the needle picking device is the need to accelerate the relatively large masses of the weft picking device. The drawback of the picking with the picking device is, besides the necessity of accelerating the picking, also the necessity of absorbing its kinetic energy at the end of the shed and the necessity of subsequent returning and rotating the picking. The disadvantage of picking with the air picking device is the considerable air consumption resulting from the loss of the pressure medium in the picking nozzle. Another disadvantage of this weft picking device is the low efficiency of kinetic energy transfer to the weft and the necessity of using a very expensive transducer. A common disadvantage of the aforementioned weft picking devices through the shed of the weaving machine is also the high noise level during operation.

It is an object of the invention to overcome or at least minimize the disadvantages of the prior art.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a weft picking device of a weaving machine, characterized in that the means for imparting kinetic energy to the weft yarn comprises a rotatable disc coupled to the drive and a rotatable pressure roller reversible between the position in which the pressure roller is pressed against the disc; a position in which the pressure roller is spaced from the disc, the weft thread path passing between the disc and the pressure roller, and at least the pressure roller and the weft brake, situated in the direction of travel of the weft thread when passing through the disc, are coupled to the control device.

The advantage of this device is that it does not need the supply of pressure medium (air, water) and is less energy intensive. A further advantage of this device is that it does not need expensive weft gauges to operate, and allows higher and more uniform picking speeds 40, especially for heavier weft materials, to be achieved. A further advantage of this device is that it has a lower noise level, in particular compared to the air picking device, thereby contributing to the reduction of the noise of the whole weaving machine.

According to a preferred embodiment, the pressure roller is synchronously rotatably coupled to the disc.

According to a further preferred embodiment, the disc and / or the pressure roller is associated with a disc rotation sensor and / or pressure roller which is coupled to the control device.

According to a further preferred embodiment, a weft stop situated in the direction away from the disc is coupled to the control device in front of the weft yarn breaking means.

According to a further preferred embodiment, the weft yarn return device, which is situated in the weft yarn path between the weft brake and the disc, is coupled to the control device.

- 1 GB 298600 B6

Overview of the figure in the drawing

The invention is shown schematically in the drawing.

DETAILED DESCRIPTION OF THE INVENTION

The weft-shaving device of the weaving machine is part of a weaving machine which comprises known knots and elements which are so obvious to the skilled person that they will not be further described here. The weft picking device of the weaving machine is situated on the machine in a known manner with respect to the known shed forming device, which comprises known unrelated weaving sheets forming a suitable picking channel 17 during weaving.

The weft picking device of the weaving machine comprises, on its side facing the weaving blades (not shown), a disk 2 which is rotatable and coupled to the drive 1. The device further comprises a pressure roller 3 which is mounted on a control device 11 which secures the pressure roller 3 from the disc 2 and the pressure roller 3 is pressed against the disc 2. At the same time, the disc 2 and the pressure roller 3 are coupled by mechanical, electrical, magnetic or other suitable a coupling to ensure rotation of the pressure roller 3 so that the disc 2 and the pressure roller 3 roll in succession at the time of the pressure of the pressure roller 3, and that the wheel 2 and the pressure roller 3 rotate synchronized at an angular velocity corresponding to the rolling speed of the pressure roller 3 and the disc 2 when the pressure roller 3 is pressed against the disc 2.

The device further comprises a weft brake 4, which is situated in the direction away from the weaving sheets behind the disc 2 and the pressure roller 3, and is coupled to the control device 12. The wiper brake control device 12 and the pressure roller control device 11 are, in a non-illustrated embodiment, formed by one common control device.

The device further comprises weft yarn interruption means, which are situated in the direction away from the weaving sheets in front of the disc 2 and the pressure roller 3, and are coupled to the control device 13. In the illustrated embodiment, the weft yarn interruption means consist of scissors 9.

The device further comprises a bobbin 16 on which the weft yarn 5 is wound and which is situated in the direction away from the weaving sheets behind the weft brake 4. The weft yarn 5 is guided through the feed channel 6 to the weft brake 4 through which it passes and the roll 2 and the pressure roller 3, behind which the weft thread 5 is guided through the channel 8 to the shears 9 and is directed into the picking channel 17.

A weft yarn return device 14 is situated between the channel 7 and the weft brake 4. In the illustrated embodiment, the weft yarn return device 5 comprises a reciprocally pivotable pair of rollers 140 between which the weft yarn 5 extends, pivoting the entire pair of rollers. 140, the pulleys of the weft yarn 5 are alternately wrapped and thus the free end of the weft yarn 5 moves back from the shears 9 to the disc 2.

The weft brake control device 4, the shear control device 13, the press roller control device 11 and the weft yarn return device 14 are coupled to the control device 15.

In the illustrated embodiment, the device also comprises a pressure roller rotation sensor 10, which is coupled to a control device 15. In a not illustrated example, the pressure roller rotation sensor 10 is replaced by a disc rotation sensor 2 or the pressure roller rotation sensor 10 is supplemented with disc rotation sensing device 2.

-2GB 298600 B6

In the illustrated embodiment, the device also comprises a weft stop 18 also connected to the control device 15.

In order to enable weaving by means of a plurality of different colored weft yarns on a single weaving machine, the device (not shown) is provided with a corresponding number of parallel weft-weaving machines of the weaving machine. provided with separate control devices 15 which are coupled to one another to coordinate the operation of the parallel weft picking devices through the shed of the weaving machine.

The device operates by releasing the weft yarn 5 at the time of picking, and at the same time the pressure roller 3 presses the weft yarn 5 against the disc 2, thereby giving the weft yarn 5 an initial velocity corresponding to the peripheral speed of the disc 2. 3 from the disc 2 and the weft brake 4 is engaged, which stops the movement of the weft yarn 5. Simultaneously with the scissors 9, the swapped part of the weft thread 5 is cut off. The time interval of the picking corresponds to the time required for such an angular rotation of the disc 2 when the pressure roller 3 is pressed. This angular rotation is measured by a sensing device 10, the signal of which is processed by a control device 15, which controls the control devices 11, 12, 13 for starting and stopping the picking. The end of the picking can also be detected by the optical weft stopper 18 coupled to the control device 15. Prior to the next picking, the weft yarn 5 is moved back by its origin (free end at the scissors 9) to the point of contact of the disc 2 and presser As it is technically impossible to place the scissors 9 close enough to the bone of this location, it is advantageous for the success of the picking that the beginning of the weft yarn 5 is as close as possible to the contact point of the roll 2 and the pressure roller 3 at pressure of the pressure roller 3 on the disc 2.

Claims (5)

PATENT CLAIMS 1. A device for weft insertion through a loom of a weaving machine comprising a weft yarn supply (5), means for guiding the weft yarn (5), a weft brake (4), means for interrupting the weft yarn (5) and means for imparting kinetic energy to the weft yarn. 5), characterized in that the means for imparting kinetic energy to the weft yarn (5) comprises a rotatable disc (5). 2) coupled to the drive (1) and the rotary pressure roller (3) reversible between the position in which the pressure roller (3) is pressed against the disc (2) and the position in which the pressure roller (3) is separated from the disc ( 2), wherein the weft thread path (5) extends between the disc (2) and the pressure roller (3) and at least the pressure roller (3) and the weft brake (4) situated in the direction of travel of the weft thread (5) 2) are coupled to a control device (15). Device according to claim 1, characterized in that the pressure roller (3) is synchronously rotatably coupled to the disc (2). Device according to any one of claims 1 or 2, characterized in that the disk (2) and / or the pressure roller (3) is associated with a sensor (10) for rotating the disk (2) and / or the pressure roller (3), which is coupled to the control device (15). Device according to any one of claims 1 to 3, characterized in that a weft stop (18) situated in the direction away from the disc (2) in front of the weft yarn interrupting means (5) is coupled to the control device (15). Device according to any one of claims 1 to 4, characterized in that the control device (15) is coupled with a device (14) for shifting the weft thread (5), which is situated in the weft thread path (5) between the weft brake (4). and disc (2).