JPS60181346A - Imparting of tension force to weft yarn in shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of applying tension to a weft by a tensor located between a yarn feeding section and a weft length measuring device of a shuttleless weft machine.

Prior art Fig. 7 shows an example of a shuttleless loom, that is, an air jet loom, in which the method for imparting weft tension according to the present invention can be implemented, in which the weft W from the yarn feeding section l passes through a tensioner to a length measuring device jK. Sent, e.g. Jitkai Showa 14-J? 4! After the length is measured by a well-known method using the length measuring device, which may be of a well-known structure as disclosed in the &4 publication, the weft pool
The air nozzle S passes through the air nozzle, the weft pool pipe S, the weft guide 6 and the gripper 7, and reaches the air nozzle S for weft flying. Further, the air nozzles are arranged in alignment in the weft insertion direction on the sled lO supporting the reed 9, and the weft yarn W measured by the length measuring device jK is passed through the air nozzle gVc at the time of weft insertion. Riding on the airflow from a communicating air source (not shown), the air is inserted into the openings of the ground warp l/and the selvage warp l formed by the heald frames for the ground warp and selvedge warp (not shown). Although not shown, it is common for the sleigh 10 to be provided with a large number of known weft guide members and an appropriate number of auxiliary air nozzles in parallel.

In such a shuttleless machine, the tensioner includes a washer tensioner as shown in FIG. 7, an air tensioner as shown in FIG. The weft is always held between the washer 29, and tension is always applied to the weft drawn out from the yarn feeding section l by the feed roller 3a of the length measuring device 3. In addition, in the air tensor, as shown in Figure 1, compressed air from an air source (not shown) is guided to the air nozzle d via the regulating valve 2C, and compressed air is constantly injected from the air nozzle d to the cooling direction of the yarn feeding section. By being
Tension is constantly applied to the weft yarn drawn out from the yarn feeding section 1 by the feed roller Ja'F-.

In this way, with conventional tensors, tension is always applied to the weft threads, so with washer tensers, there are problems in that they damage the weft threads and cause early wear on the washers, and with air tensors, There was a problem in that it consumed a large amount of compressed air.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a weft tensioning method that solves the problems of the prior art mentioned above.

Structure of the Invention According to research conducted by the inventor of the present invention, as mentioned above, conventional tensioners conventionally apply tension to the weft at all times, but the purpose of installing the tensioner is to provide yarn feeding when the machine is stopped or when I is excited. If the weft yarn is unwound too much from the section to the length measuring device due to inertia, especially in the case of large yarns, the weft yarn becomes thick (sagging) and prevents it from getting tangled without being guided to the specified part of the length measuring device, and the loom It was found that the tensor function is not necessary during steady operation.

Based on this knowledge, the method for imparting weft tension according to the present invention is as follows:
In order to achieve the above-mentioned purpose, when starting the machine, the tensor is operated from before starting to a predetermined point after starting, and then deactivated, and when the machine is stopped, the tenser is activated from the specified point before stopping until after stopping. When the tensor is activated, tension is applied to the weft yarn to the weft length measuring device.

Example 1 Figure 3 shows the first example of the present invention (implemented on an air tensor)
1 shows a schematic block diagram of an apparatus for implementing the
By operating the device according to the flowchart shown in FIG. 9, the air tensioner is operated as shown in FIG. S to apply tension to the weft yarn.

That is, in Fig. 3, the air tensor and air source
A solenoid valve 1 is interposed between the two and the solenoid valve U is controlled by a control device such as a microcomputer. The control device 1 has an arithmetic processing section 3 and a driver koda, and the arithmetic processing section 7 has selvage threads, discarded selvedges, warp threads,
- A stop request signal is input from the sensor S that detects machine stop conditions such as system outage or human operation. Also,
A starting signal from a switch button roller for operating the machine base motor is input to the arithmetic processing section.

3 and 9, when starting up, the power is first turned on and the output signal of the arithmetic processing unit 3 drives the driver, and the output signal of the driver 21I drives the solenoid valve. 21 turns on and opens. Therefore, the compressed air from the air source -○ is supplied to the air nozzle d of the tenserco, and the tenser is in an operating state aK in which compressed air is injected from the air nozzle 2d to apply tension to the weft.
Become. Thereafter, when the switch button 26 of the machine base motor is depressed, the motor is turned on and the machine base rotates. On the other hand, the activation signal from the switch button roller is also supplied to the arithmetic processing unit 3, and in the arithmetic processing unit 3, a timer measures a predetermined time from when the activation signal is manually input.
When the timer reaches the indicated value, the output signal from the arithmetic processing section 3 drives the driver koda, and the output signal from the driver q closes the electromagnetic valve ko 1, making the tensor koda inactive.

In this state, the machine continues normal operation, during which time the tensorco is inactive and does not apply unnecessary tension to the weft. During this normal M rotation, sensor l generates a machine stop request signal, and arithmetic processing is performed. When the IC is input, the arithmetic processing section 3 drives the driver 1, opens the solenoid valve 1 in response to the output signal of the driver 1, and puts the tensor controller into operation.

On the other hand, the arithmetic processing section 23 detects the crank angle of the machine base, and when a predetermined angle suitable for stopping the machine base is detected, the motor is turned off and a brake (not shown) is turned on to stop the machine base.

If the power is not turned off, the machine will stop operating the tensor.

Next, turn on the switch button to restart the machine, and the machine will restart according to the procedure described for startup.

Furthermore, the time from when the machine starts to start until Tenserco finishes operating is controlled by a timer.
It may also be controlled by the crank angle.

Therefore, according to the first embodiment of the present invention, as can be understood from FIG. When the machine is in operation and the machine is stopped, the tensor is operated from a predetermined time before the machine stops until after the machine stops, and the tensor does not always apply tension to the weft.

Embodiment FIG. 6 is a diagram corresponding to FIG. 3 when the present invention is implemented in a one-shear tensor, and the main difference is that the tensor is of a washer type consisting of a spring λa and a washer 2b. , and a solenoid 27 is used in place of the electromagnetic valve I to drive the tensor, and this first embodiment operates substantially in the same manner as the first embodiment described above.

Effects of the Invention As described above, according to the present invention, since the tensor does not operate all the time, tension is not constantly applied to the weft. Therefore, in the case of the air tensor, the amount of air consumed is greatly reduced and energy is saved, and in the case of the washer tenser, the weft is not damaged and the durability of the tensor is increased. Furthermore, if a microcomputer is used to control the tensor, the sensor activation timing and activation time can be easily adjusted by software.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing an example of a shuttleless loom in which the present invention can be implemented; A schematic block diagram of an apparatus for carrying out the first embodiment of the invention, FIG. 7 is a flowchart when carrying out the first embodiment of the invention in the apparatus of FIG. 3, and @S diagram is a diagram of the first embodiment. FIG. 6 is a schematic block diagram of an apparatus implementing the first embodiment of the present invention.

Claims (1)

[Claims] In a shuttleless loom having a tensor between a yarn feeding section and a weft length measuring device, when starting, the tenser is activated from before starting to a predetermined time after starting, and then is deactivated, and when the loom is stopped, A method for applying weft tension, comprising operating the tensor from a predetermined time before stopping to after stopping, and applying tension to the weft to the weft length measuring device when the tenser is activated.