JPH0369635A - Air feeder in jet loom - Google Patents

Abstract

PURPOSE:To prevent end breakage resulting from a light air for removal of yarn by making an air feed channel for preventing removal of yarn changeable to either one of two pressure states of strongly light air and weakly light air, changing to a weakly light air side during suspension of operation and setting. CONSTITUTION:A change selection means is converted to a strongly light air side during operation of weaving machine and maintained in this side to cause a strongly light air in a main nozzle 1 for weft inserting. When operation of weaving machine is stopped, the change selection means converts a pressure change means 15 from the strongly light air side to a weakly light air side to cause a weakly light air in the main nozzle 1 for weft inserting. Consequently, by setting the action pressure of the strongly light air and the weakly light air properly, end breakage resulting from light air action during suspension of operation of weaving machine is avoided while preventing removal of yarn from the main nozzle 1 for weft inserting during operation of weaving machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air supply device for preventing thread removal in a main nozzle for weft insertion of a jet loom.

[Prior Art] In this type of air supply device disclosed in Japanese Utility Model Application Publication No. 60-82475, a main nozzle for weft insertion is used to prevent yarn from coming off from the main nozzle for weft insertion even when the loom is stopped. Low pressure air is being supplied to the By continuing to supply low-pressure air even when the loom is stopped, it is possible to prevent the thread from coming off the main nozzle for weft insertion, and the loom can be started without threading the main nozzle for weft insertion again. can be restarted.

[Problem to be solved by the invention] However, when the loom is in operation, the action of thread removal is due to the swinging of the reed,
Or, it is relatively large due to the weft cutting shock after beating the reed, etc. In order to counteract such thread pulling, a certain amount of low-pressure jet action (hereinafter referred to as a breeze) is required during loom operation. It is. If such a breeze, which is important for VIa machine operation, is similarly applied to the weft tip while the loom is stopped, the weft tip will untwist even if the loom is stopped for a short time because the weft is prevented from being pulled out. occurs, and the yarn strength is greatly reduced due to this untwisting. In such conditions, even slight wind pressure can cause thread breakage.
When restarting the loom, the weft insertion error occurs and the loom stops.

In addition, the blown thread pieces become woven into the woven fabric and cause fabric defects. When the loom is in operation, the waiting time for inserting the weft in the state where the weft is prevented from being pulled out is very short, so yarn breakage does not occur.

An object of the present invention is to provide an air supply device that can prevent yarn breakage due to such a breeze.

[Means for Solving the Problems] To this end, the present invention provides a pressure switching means that can switch the prevention air supply path to either one of two pressure states, strong breeze and weak breeze, and when the operation is stopped, The air supply device was constituted by a switching selection means for switching and setting the pressure switching means to the weak breeze side.

[Function] When the loom is operating, the switching selection means switches and holds the pressure switching means on the strong breeze side, and a strong breeze is generated at the weft insertion main nozzle. When the Wi machine operation is stopped, the switching selection means switches the pressure switching means from the strong breeze side to the weak breeze side, and a weak breeze is generated at the weft insertion main nozzle. Therefore, by appropriately setting the working pressure of the strong breeze and the weak breeze, it is possible to prevent the weft insertion main nozzle from slipping during operation of the loom, and also to avoid yarn breakage due to the effect of the breeze when the loom is stopped. I can do it.

[Example] Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

The weft yarn Y ejected from the main weft insertion nozzle 1 is relayed to the relay jets of the plurality of weft insertion auxiliary nozzle groups 2, 3, 4.5, and when the weft insertion is performed successfully, The weft yarn Y is detected by the weft yarn detector 6 within the loom rotation angle range, and the loom operation continues. If the weft detector 6 does not detect the presence of a weft within a predetermined loom rotation angle range, the loom operation is stopped.

The injection of pressurized air for weft insertion in the main nozzle for weft insertion 1 is controlled by opening and closing of the electromagnetic valve ■1 on the air supply path for weft insertion 7, and the injection of pressure air for weft insertion in the weft insertion phase auxiliary nozzle groups 2 to 5 is Solenoid valve v2. v3. V4. V
Controlled by opening and closing of s. The solenoid valve vl is connected to the pressure air supply tank 8, and the solenoid valves v2 to v5
is connected to the pressurized air supply tank 9. Each pressure air supply tank 8.9 is connected to the main pressure tank 12 via a manual pressure regulator 10.11.

The opening/closing control of each electromagnetic valve Vl, V2 to v5 is performed by commands from the control computer C.
is the electromagnetic pulp v1. based on the detection signal from the rotary encoder 13. Commands to open and close v2 to v5. This command data is input and set to the data memory C1 via the central processing unit CPU of the control computer C, and the central processing unit CPU inputs each of these data and the weft insertion control program input and set to the program memory C2. Based on this, weft insertion command control is carried out.

The air supply path 7 for weft insertion between the main nozzle 1 for weft insertion and the electromagnetic valve v1 has an air supply path 14 for prevention.
is connected, and at its starting end! A magnetic three-way valve 15 is connected, and a check valve 16 is interposed in the middle. The tm three-way valve 15 and the source pressure tank 12 are connected by a pair of prevention air supply paths 14A and 14B, and each of the prevention air supply paths 14A and 14B are connected to a manual pressure regulator 17. .18 is interposed. One pressure regulator 17 is adjusted to a lower pressure supply state than the other pressure regulator 18.

In addition to the weft insertion control program, the program memory C2 of the control computer C includes a control program for preventing tricks shown in the flowchart of FIG. When the loom is in normal operation, the control computer C keeps the electromagnetic three-way valve 15 energized, and as shown in FIG. Connect with. As a result, air at the pressure adjusted and set by the pressure regulator 18 is supplied to the main nozzle 1 for weft insertion, and a strong breeze blows from the main nozzle 1 for weft insertion. Due to this strong breeze, the tip of the weft yarn Y that is waiting for weft insertion is slightly extended from the injection port of the main weft insertion nozzle 1, and its posture is adjusted, and the weft yarn Y is inserted in a good posture.

Therefore, the tip of the weft Y is inserted smoothly without interfering with the warp or the weft guide.

The cut end of the weft thread on the weft insertion main nozzle 1 side can be easily removed from the weft insertion main nozzle 1 due to the cutting shock after beating or the swinging action of the reed beating, but by appropriately setting the bullet wind pressure, this yarn can be It is possible to reliably prevent it from coming off. The bullet wind pressure set in this way becomes a factor that causes untwisting of the tip of the weft yarn Y, which is prevented from being pulled out by the weft length measuring and storage device (not shown).If the pulling-out prevention period is long, the untwisting increases and the yarn Cuts occur, but
During normal operation, the weft thread pull-out prevention period is very short, and thread breakage does not occur due to the bullet wind.

If a weft insertion error occurs such that the inserted weft yarn Y does not reach the installation position of the weft yarn detector 6, the weft yarn detector 6
A weft non-detection signal is output to the control computer C. The control computer C issues a command to stop the loom based on the input of this weft non-detection signal, and the loom stops. Furthermore, the control computer C instructs the electromagnetic three-way valve 15 to demagnetize based on a machine stop signal input called a weft no-detection signal, and the electromagnetic three-way valve 15 closes the air supply path 14 to prevent thread removal as shown in FIG. The connection between the thread removal prevention air supply path 14B and the thread removal prevention air supply path 14A is changed to the connection between the thread removal prevention air supply path 14A and the thread removal prevention air supply path 14A. As a result, when the loom is stopped, low-pressure air adjusted by the pressure regulator 17 is supplied to the weft insertion main nozzle 1, and a weak enemy wind with a pressure lower than that of the bullet machine wind is supplied from the weft insertion main nozzle 1. Blow.

When the loom is stopped, it is sufficient to use a weak wind pressure that is considerably lower than the pressure of the bullet wind to prevent the yarn from coming off from the weft insertion main nozzle 1. Therefore, by appropriately setting the pressure of the weak wind so as to secure the pressure necessary to prevent this thread pulling, the twist at the tip of the weft yarn Y that is prevented from being pulled out on the weft length measuring and storage device side can be It is possible to obtain printing that suppresses return and pulls out the tip of the weft yarn Y in a weak manner, and also prevents yarn breakage and yarn coming out when the loom is stopped, which increases the time required to prevent pulling out on the weft length measuring and storage device side. This can be reliably prevented.

In addition to weft insertion errors, looms are stopped for other reasons such as warp thread breakage and manual operation commands, and when these operations are stopped, it is necessary to switch from a strong breeze to a weak state as described above. It will be done.

When the loom is restarted by turning on the start button or automatically starting, the loom may automatically reverse to the loom restart position and then enter normal forward rotation, or may resume normal rotation without reversing. However, the control computer C maintains the electromagnetic three-way valve 15 in a demagnetized state until the normal rotation start timing, and energizes the electromagnetic three-way valve 15 when the normal rotation starts. As a result, the breeze from the weft insertion main nozzle 1 becomes strong only during normal forward rotation operation, and when the machine is stopped or the loom is reversed, the time required to prevent weft withdrawal on the weft length storage device side is longer. The breeze is maintained at a low level to ensure thread breakage is prevented.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG.
Check valve 16 and electromagnetic regulator 2 for pressure adjustment on 9
An embodiment in which 0 is interposed is also possible. The electromagnetic regulator 2o can be switched between a pressure supply state that generates a weak enemy wind and a pressure supply state that generates a bullet wind according to a command from the control computer C, and the control computer C performs the same switching control as in the previous embodiment. , prevents thread breakage, prevents thread removal, and adjusts thread posture.

Furthermore, an air supply configuration in which the check valve 16 in each embodiment is omitted is also possible.

[Effects of the Invention] As detailed above, the present invention uses the bullet style only when the m machine is in the normal operating state, and uses the weak enemy style at other times, so thread removal during normal operation is easy. The slight wind pressure necessary for prevention and thread pulling at other times can be appropriately set and used, respectively, and by this, thread breakage can be reliably prevented without causing thread breakage. It has excellent effects.

[Brief explanation of drawings]

1 to 3 show an embodiment embodying the present invention.
The figure is a front view of the road body showing the normal operating condition of the loom, and the second figure is ￥
FIG. 3 is a flowchart showing an air supply control program for preventing thread removal, and FIG. 4 is a front view of the road surface showing another example. Weft insertion main nozzle 1, weft insertion air supply path 7, thread removal prevention air supply path 14.14A. 14B, electromagnetic three-way valve 15 as pressure switching means, control computer C1 as switching selection means, weft Y;

Claims (1)

[Claims] 1 In a jet loom in which the weft insertion air supply route and the yarn dropout prevention air supply route are connected to the weft insertion main nozzle, the thread dropout prevention air supply route is set to one of two pressure states: strong breeze and weak breeze. 1. An air supply device for a jet room, comprising: a pressure switching means capable of switching to a weak wind state; and a switching selection means for switching and setting the pressure switching means to a weak breeze state when the operation is stopped.