JPH08302541A - Weft-inserting device for water jet loom - Google Patents

Abstract

PURPOSE: To provide a weft-inserting device which has a simplified structure, enables accurate weft insertion at the first pick up and improves the qualities of the woven fabric. CONSTITUTION: This device has a cam 40 rotating synchronously with the main shaft of the loom and a rockable interlock 32 to which a cam follower 38 being in contact with this cam 40 is connected and which is linked to the plunger 20 of a pump 16 for weft insertion. Further, this device is equipped with a spring 24 energizing the cam follower 38 through an interlock member 32 to the cam 40 and a nozzle 12 for effecting weft insertion by jetting pressurized water from the pump 16. The cam 40 displaces the cam follower 38 with its lifting face 40a by resisting to the spring 24, to allow the plunger 20 to move back and the pump 16 to suck water. Then, the cam follower 38 is released from the lifting face 40a of the cam 40 to feed pressurized water to the wefting nozzle with its pressure corresponding to the force of the spring 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft inserting device for a water injection type loom which carries out weft insertion with pressure water jetted from a nozzle.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 60-161181, a weft inserting device for a water jet loom is equipped with a cam that rotates synchronously with a main shaft of a loom and a cam follower to jet pressurized water. Is provided with a swingable interlocking member connected to the plunger of the pump, and a spring for urging the cam follower to the cam. Further, weft insertion is performed by injecting pressure water supplied from the pump. It has a nozzle.

The operation of this weft inserting device is as follows.
The lift surface of the cam displaces the cam follower against the spring to cause the pump to absorb water. Then, the cam follower is released from the lift surface of the cam before the weft is released by the weft holding member including the clamper or the locking pin, and the repulsive force of the spring supplies pressure water from the pump to the weft inserting nozzle. While the weft is still held, pressure water is jetted from the weft inserting nozzle to extend the tip of the weft hanging from the weft inserting nozzle in the weft inserting direction, and immediately after that, the weft holding member releases the weft. As a result, the weft yarn stored in the length measuring and storage device flies along with the pressure water and is weft-inserted.

[0004]

In the case of the above-mentioned prior art, since the rotational speed of the cam during the first pick, which is the weft insertion in the first cycle immediately after the start of the loom, is lower than the rotational speed during steady operation, As will be described later, the actual pressure water injection start timing during the first pick is earlier than that during steady operation, and the pressure water collides with the warp threads that have not been fully opened, causing damage to the warp threads. However, there is a problem that the quality of the woven fabric is deteriorated.

Further, in the case of the above-mentioned conventional technique, there is a problem in that, at the time of the first pick, the conveying force of the pressure water to the weft is reduced and a weft insertion failure such as a show topic or a loose weft occurs. This is because the rotation speed of the cam is lower than that during steady operation, so the actual pressure water injection start timing during first pick becomes earlier than that during steady operation, as will be described later. This is because the time from the start of injection of the pressure water to the weft release of the weft holding device becomes long. If the time until the weft is released is longer than in steady operation, the pressure of the pressure water will gradually decrease with the expansion of the spring. The spring that gives the force is ejected in a state where it is extended to some extent, and the weft is pulled by relatively low pressure water. For this reason, a sufficient traction force does not act on the weft, and the carrying force of the pressure water to the weft at the time of the first pick is reduced, and weft insertion errors such as show topic and weft loosening occur.

Here, the reason why the actual injection start timing in the first pick is advanced will be described below.
First, during the steady operation of the loom, the cam rotates at the speed during the steady operation, so the displacement speed of the cam follower by the cam is fast, and when the cam follower is released from the lift surface,
Due to the inertial force of the swing lever or the like, the position of the cam follower 2 is changed to the cam surface 4 as shown by the cam follower locus in FIG.
The amount of overrun away from is relatively large.
After this overrun, the repulsive force of the spring causes the displacement of the cam follower 2 to drastically decrease near the loom crank angle (the maximum reed position of the reed is 0 °) of 95 °, and the pressure water is discharged from the pump. Will be started.

On the other hand, when the rotation of the main shaft is in a transient state immediately after the start of the loom, in particular, the first 1 after the start of the loom.
In the cycle, the rotation speed of the loom main shaft is lower than that in the steady operation, and the rotation speed of the cam is also low. Therefore, as shown by the cam follower locus in FIG. 11, since the displacement speed of the cam follower 2 is also low, the amount of overrun due to inertia is small, and the timing at which the displacement amount of the cam follower 2 sharply decreases is 75 ° in terms of the loom crank angle. Will be faster. Therefore, the actual start timing of the injection of the pressure water from the weft insertion nozzle due to the discharge of the pressure water from the pump is earlier than that during the steady operation.

On the other hand, it is possible to advance the weft release timing by the weft holding member only during the first pick so that the time difference from the start of actual injection to the weft release is the same as that during normal operation. However, weft insertion will start earlier, and the weft will fly before the warp is sufficiently opened.Therefore, there is a high possibility that the weft will be caught by the warp, resulting in poor weft insertion. Is.

The present invention has been made in view of the above-mentioned problems of the prior art. A water jet loom having a simple structure, capable of accurately carrying out weft insertion at the time of first pick, and having good woven fabric quality. An object is to provide a weft inserting device.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cam that rotates in synchronization with a main shaft of a loom, and a swingable interlocking member connected to a plunger of a weft-insertion pump to which a cam follower abutting the cam is attached. A coil spring for urging the cam follower toward the cam via the interlocking member, and a weft inserting nozzle for injecting pressure water from a pump for weft insertion, and the cam follower is lifted by the lift surface of the cam. Water injection that supplies pressured water corresponding to the spring force to the weft inserting nozzle by displacing against the spring and retracting the plunger to allow the pump to absorb water and releasing the cam follower from the lift surface of the cam. Type loom, the cam follower released from the lift surface hardly comes into pressure contact during normal operation of the loom, and the loom is started. A water jet loom in which an auxiliary cam surface is provided on the cam to contact the cam follower released from the lift surface later until the regular supply start timing of the pressure water and regulate the position of the cam follower to a predetermined height It is a weft inserting device.

Further, according to the present invention, a cam that rotates in synchronization with the main shaft of the loom, a swingable interlocking member that is connected to a plunger of a weft insertion pump, to which a cam follower that is in contact with the cam is attached, and the interlocking member are provided. A coil spring for biasing the cam follower to the cam via the cam, and a weft inserting nozzle for injecting pressure water from a pump to perform weft insertion, and the cam follower resists the spring by the lift surface of the cam. A water jet loom that displaces the plunger to retract it so that the pump absorbs water, and releases the cam follower from the lift surface of the cam to supply pressure water corresponding to the spring force to the weft inserting nozzle. An on-off valve was provided between the pump and the weft inserting nozzle so that when the weft was inserted for the first time after the start of the loom, pressure water was actually released at the latest. From the timing to start is supplied from the serial pump, a weft insertion device of the water jet loom to a closed state the switch valve to the vicinity of the supply start timing of the normal pressure water.

The regular start timing of the pressure water means that the cam follower released from the lift surface of the cam rotating in synchronization with the loom main spindle is displaced by the repulsive force of the spring when the loom main spindle is in steady operation. It is the rotation angle of the spindle when the quantity begins to decrease sharply. That is, it means the rotation angle of the main shaft at the time when the pump starts to supply pressurized water to the weft inserting nozzle during steady operation.

[0013]

In the weft inserting device of the water jet loom of the present invention, the cam follower is released from the lift surface after being displaced by the lift surface of the cam during the first pick.
Since the cam rotation speed is lower than during steady operation, the cam follower displacement speed is also low. Therefore, the inertial force is small and the overrun amount is small. Therefore, after the cam follower is released from the lift surface, the amount of displacement of the cam follower tends to be reduced immediately by the repulsive force of the spring. However, the cam follower comes into contact with the auxiliary cam surface from before the regular supply start timing of the pressure water to the regular supply start timing, and the reduction of the displacement amount of the cam follower is restricted by this auxiliary cam surface, and the cam follower passes through the auxiliary cam surface. After that, the cam follower is released from the auxiliary cam surface, and the repulsive force of the spring causes the displacement amount to decrease sharply and the pressure water to be discharged. As a result, during the first pick, the displacement of the cam follower is regulated by the auxiliary cam surface, the rapid decrease of the displacement of the cam follower is delayed until the timing of the regular supply of pressure water, and the displacement of the weft is sufficiently high. Pressure water is jetted from the weft inserting nozzle.

Further, in the weft inserting device loom of the water jet loom according to the present invention, the opening / closing valve is closed until the regular supply start timing of the pressure water during the first pick. Even if the water is discharged, the timing at which the pressure water starts to be supplied to the weft inserting nozzle can be substantially the same as the pressure water supply start time during the steady operation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A weft inserting device for a water jet loom according to an embodiment of the present invention will be described below with reference to the drawings. 1 to 4
Shows the first embodiment of the present invention, and the water jet loom of this embodiment is arranged such that the weft yarn 10 is compressed under the pressure water W as shown in FIG.
It also has a weft insertion nozzle 12 for jetting and weft insertion, and a plunger pump 16 connected to the weft insertion nozzle 12 via a water conduit 14. Plunger pump 16
Has a cylindrical cylinder portion 18 and a plunger 20 that is fitted into the cylinder and is slidably provided. Further, a spring receiver 22 that slides integrally with the plunger 20 is provided outside the cylinder portion 18. The coil spring 24 is fitted to the spring receiver 22.
The coil spring 24 has one end in contact with the inner wall surface of the plunger pump 16 and the other end in the spring receiver 22.
Is engaged with the collar portion 26 at the tip of the.

The proximal end portion of the plunger 20 of the plunger pump 16 is connected to a connecting lever 32, which is an interlocking member, via a connecting member 30, which is an interlocking member.
Is a connecting lever 36 that is an interlocking member around the rotating shaft 34.
It is provided so as to be swingable integrally with. Connection lever 36
A cam follower 38 is rotatably attached to the tip of the cam, and is in contact with the cam 40. The cam 40 is interlocked with a loom main shaft (not shown), and the cam 40 also moves once for each revolution of the loom main shaft.
Rotate. A stopper 39 that restricts the stroke of the plunger 20 is provided at a position corresponding to one end of the connecting lever 32. As a result, every time the cam 40 rotates once, the cam follower 38 swings the connecting levers 32 and 36 by its lift surface 40a, and the plunger 20 moves to the left in the drawing against the biasing force of the coil spring 24. When the cam surface becomes lower, the cam follower 38 separates from the cam surface, and the urging force of the coil spring 24 causes the plunger 20 to slide in the cylinder portion 18 in the right direction in the drawing to inject the pressure water W.

As shown in FIG. 4, the cam 40 is formed with an auxiliary cam surface 42, which contacts the cam follower 38 in the rotational direction from the terminal end of the lift surface 40a. The auxiliary cam surface 42 is hardly pressed by the cam follower 38 released from the lift surface 40a during the steady operation of the loom, and immediately after the loom is started, the cam follower 38 released from the lift surface 40a is compressed by the pressure water. W
The cam surface shape is slightly raised on the extension line of the lift surface 40a so as to come into contact with the normal supply start timing before the normal supply start timing. This auxiliary cam surface 42 is formed over a phase corresponding to a loom crank angle of 95 °, which is the timing of starting the regular supply of pressure water, that is, the timing of starting the supply of pressure water during steady operation.

In the weft inserting device of the water jet loom according to this embodiment, the cam follower 38 released from the lift surface 40a is in steady operation, and the cam follower 38 of FIG. As indicated by the locus 38, after the cam 40 overruns from the lift surface 40a, the repulsive force of the spring 24 drastically reduces the displacement amount at the loom crank angle of about 95 °. Also,
During steady operation, the lower end of the cam follower 38 that has passed the end of the lift surface 40a makes contact with the auxiliary cam surface 42 at almost zero pressure, or almost does not make contact and passes near the surface. Therefore, the auxiliary cam surface 42 has no influence on the cam follower 38.

On the other hand, during the first pick, since the rotation speed of the cam 40 is low as described above, the lift surface 40
The amount of overrun of the cam follower 38 released from a is small, and the released cam follower 38 is
Then, the coil spring 24 is pressed by the urging force of the coil spring 24. The lift position of the cam follower 38 is restricted by the auxiliary cam surface 42, and the cam follower 3 is closed by the auxiliary cam surface 42 so as to approximate the locus of the cam follower 38 released from the lift surface 40a during steady operation.
8 is lifted up. Therefore, unlike the conventional cam follower loci of FIGS. 2 and 3, the displacement amount does not decrease at a fast timing. Then, as shown in the cam follower loci of FIGS. 2 and 3, at the loom crank angle of about 95 °, the cam follower 38 is released from the auxiliary cam surface 42, and thereafter,
Displacement decreases sharply.

As described above, the cam follower 38 released from the lift surface draws a locus almost similar to that in the steady operation by the auxiliary cam surface 42, and the injection start timing of the pressure water W at the time of the first pick is the steady operation. It becomes 95 °, which is almost the same as the time. Therefore, as shown in FIG. 2, during the first pick, the pressure water is injected at the same timing as in the steady operation.

The auxiliary cam surface 42 is the lift surface 40a.
In addition to the one directly formed on the cam 40 having the cam surface 40, another cam having only the auxiliary cam surface 42 may be superposed on the cam 40 having the lift surface 40a.

Next, a weft inserting device for a water jet loom according to a second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. As shown in FIGS. 5 and 6, the weft insertion device of the water jet loom of this embodiment has a lift amount lower than the movement locus of the cam follower 38 released from the lift face 40a during the steady operation of the auxiliary cam face 52. The loom crank angle is formed over a phase corresponding to 82 ° to 95 °. In terms of shape, as shown in FIG. 6, the auxiliary cam surface 52 is formed by linearly forming a surface of a predetermined angle at a position slightly lower than the extension line of the lift surface 40a. Control. As shown in FIG. 5 and FIG. 6, the auxiliary cam surface 52 has a cam follower 38 having a lower lift position than the movement locus during steady operation and higher than the movement locus of the cam follower of the conventional technique, and the loom crank angle. It is a surface formed so that the lift amount does not decrease any more around 82 °.

In the weft inserting device of this embodiment, as shown in FIG. 5, the displacement amount of the cam follower 38 released from the lift surface 40a during the first pick is temporarily reduced at the loom crank angle of 75 °. When the crank angle is 82 °, the auxiliary cam surface 52 is contacted to prevent the displacement from decreasing,
After that, when the loom crank angle is 95 °, the cam follower 38 is released from the auxiliary cam surface 52 as shown in the movement locus of the cam follower 38 in FIG. As shown in FIG. 7, the pressure change of the pressure water during the first pick starts to drop at the loom crank angle of 75 °, the cam follower 38 contacts the auxiliary cam surface 52 at the loom crank angle of 82 °, and the displacement is temporarily changed. Regulated to maintain its position. As a result, the plunger 20 stays in that position and the pressure water W
The urging force of the coil spring 24 is temporarily reduced to almost zero, and the pressure sharply decreases. Then, when the cam follower 38 passes through the auxiliary cam surface 52, the lift of the cam follower 38 is released, and the urging force of the coil spring 24 is increased.
The pressure of the pressure water W is rapidly increased, and due to the inertia of the cam followers 38 and the like, the pressure water is jetted at a value close to the pressure during steady operation near the loom crank angle of 95 ° immediately after the opening. Done. After that, a clamper (not shown) releases the weft at a crank angle of 105 ° of the loom and inserts the weft.

Also with the weft inserting device of this embodiment, the auxiliary cam surface 52 prevents the injection timing of the pressure water W from being advanced, and the weft insertion is performed at a sufficiently high pressure of the pressure water W when the weft is unwound during the first pick. It can be performed.

Next, a weft inserting device for a water jet loom according to a third embodiment of the present invention will be described with reference to FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 8, the weft insertion device of the water jet loom of this embodiment has a cam follower 38 in which the auxiliary cam surface 54 is released from the lift surface 40a during steady operation.
Is set to a position lower than the lower end position of the cam follower 38 in the case of the conventional technique, and a position slightly before the regular supply start timing of the pressure water W at a loom crank angle of 90. It was formed over the phase corresponding to °.

Also with the weft inserting device of this embodiment, the auxiliary cam surface 54 prevents the injection timing of the pressure water W from being advanced, and the weft insertion is performed with a sufficiently high pressure of the pressure water W when the weft is unwound during the first pick. It can be performed.

Next, a weft inserting device for a water jet loom according to a fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 9, the weft inserting device of the water jet loom of this embodiment has an opening / closing valve 60 in the middle of the water conduit 14 between the pump 16 and the weft inserting nozzle 12.
Is provided. The pump 16 is connected to the upstream side of the pump 16 via the water conduit 14 to a constant water level tank 62 for storing pressurized water.

The operation of the weft inserting device of this embodiment is generally as follows.
The starting angle of the loom is near the crank angle of 200 ° immediately before the start of the suction stroke of the pump 16, and as shown in FIG. 10, when the first weft insertion after the starting of the loom is started, the crank angle of the loom is 0 °. The on-off valve 60 is closed until the loom crank angle of 95 °, which is the timing to start supplying the regular pressure water W. Then, in the first cycle after the loom is started, the on-off valve 60 is opened at the loom crank angle of 95 °, which is the timing for starting the regular supply of the pressure water, and thereafter kept open during the loom operation.

In the weft inserting device of this embodiment, pressure water is discharged from the pump 16 at the loom crank angle of 75 ° during the first pick, but the opening / closing valve 60 is closed up to the loom crank angle of 95 °. Until then, the maximum water pressure is maintained inside the water conduit 14 from the pump 16 to the opening / closing valve 60. Then, at the same time as the opening / closing valve 60 is opened, the pressure water W is jetted from the weft insertion nozzle 12. After that, the clamper 64 unwinds the weft, and the weft insertion is performed. With this, the same effect as that of the above-described embodiment can be obtained.

The opening / closing valve 60 is closed at the latest when the actual supply of the pressure water W is started during the first pick, and when the loom crank angle is 75 °, the opening / closing valve 60 is at the normal start timing of the supply of the pressure water W. It suffices if the crank angle is 95 ° and the open state is reached.

Further, the control of the opening / closing valve 60 may be performed not only during the first pick but also over several cycles after the start of the loom, if necessary. For example, the on-off valve 60 can be arbitrarily set such that it is closed at 0 ° to 95 ° for three cycles after the loom is started.

Further, in order to prevent a weft insertion error during the first pick, the position of the rotating shaft 34 of the connecting levers 32 and 36 is located downstream of the position during steady operation in the rotational direction of the cam 40, that is, the upper left in FIG. It may be slightly offset in the direction. After starting the loom in such a state, the crank angle of the loom at startup is 200 °. Therefore, the suction stroke of the pump 16 is started from the completion of discharge of the pressure water W at the first weft insertion after starting the loom. In between, connecting lever 3
By shifting the positions of the rotary shafts 34 of 2, 36 to the upstream side in the rotation direction of the cam 40, the positions are returned to the positions during steady operation.

By moving the position of the rotary shaft 34 of the connecting levers 32 and 36, the cam follower 38 with respect to the cam 40 is moved.
Is set later than that during the normal operation of the loom, and the timing itself when the cam follower 38 is released from the lift surface 40a is delayed during the first pick.

As a result, even if the overrun amount of the cam follower 38 during the first pick is smaller than that during the steady operation, that is, the displacement amount of the cam follower 38 is released immediately after the cam follower 38 is released from the lift surface 40a during the first pick. Weft insertion nozzle 1
The timing at which pressure water starts to be supplied to 2 is the same as or close to that at the time of steady operation. The pump 16
Is fixed, the moving direction of the rotating shaft 34 is slightly moved on an arc having a radius from the connecting portion of the interlocking lever 32 and the connecting member 30 to the rotating shaft 34.

[0035]

According to the weft inserting device of the water jet loom of the present invention, the injection start timing of the pressure water from the weft inserting nozzle is set at the same time as or similar to the steady operation during the first pick. Therefore, there is no reduction in pressure water during weft insertion during the first pick, and it is possible to prevent occurrence of weft insertion failure such as show topic and weft loosening. Further, the pressure water does not collide with the warp yarns, and the quality of the woven fabric is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a weft insertion nozzle and a plunger pump according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of each part during weft insertion in the first embodiment of the present invention.

FIG. 3 is a graph showing a crank angle of a loom and a displacement amount of a cam follower according to the first embodiment of the present invention.

FIG. 4 is a front view showing the cam of the first embodiment of the present invention.

FIG. 5 is a graph showing a crank angle of a loom and a displacement amount of a cam follower according to a second embodiment of the present invention.

FIG. 6 is a front view showing a cam according to a second embodiment of the present invention.

FIG. 7 is a graph showing the pressure of pressure water and the crank angle of a loom according to the second embodiment of the present invention.

FIG. 8 is a graph showing a crank angle of a loom and a displacement amount of a cam follower according to a third embodiment of the present invention.

FIG. 9 is a schematic view showing a weft inserting device of a fourth embodiment of the present invention.

FIG. 10 is a timing chart showing the state of each part at the time of weft insertion of the fourth embodiment of the present invention.

FIG. 11 is a graph showing a crank angle of a loom and a displacement amount of a cam follower according to a conventional technique.

[Explanation of symbols]

 10 Weft 12 Weft insertion nozzle 16 Plunger pump 18 Cylinder part 20 Plunger 24 Coil spring 32, 36 Coupling lever (interlocking member) 38 Cam follower 40 Cam 40a Lifting surface 42, 52, 54 Auxiliary cam surface

Claims (2)

[Claims] 1. A cam that rotates in synchronization with a main shaft of a loom, and a swingable interlocking member connected to a plunger of a weft inserting pump, to which a cam follower that abuts the cam is attached.
A spring for urging the cam follower toward the cam through the interlocking member, and a weft insertion nozzle for injecting pressure water from a pump to perform weft insertion, and the cam follower is moved to the spring by the lift surface of the cam. A water jet loom that supplies pressure water according to the spring force to the weft inserting nozzle by displacing the plunger to retract the plunger to allow the pump to absorb water and release the cam follower from the lift surface of the cam. In the weft inserting device, the cam followers released from the lift surface hardly come into pressure contact during steady operation of the loom, and the normal pressure water is applied to the cam followers released from the lift surface immediately after the loom is started. A water jet loom characterized in that the cam is provided with an auxiliary cam surface that abuts and regulates the position until the supply start timing. Weft insertion device. 2. A cam that rotates in synchronization with the main shaft of the loom, and a swingable interlocking member connected to a plunger of a weft insertion pump, to which a cam follower that abuts the cam is attached.
A spring for urging the cam follower toward the cam through the interlocking member, and a weft insertion nozzle for injecting pressure water from a pump to perform weft insertion, and the cam follower is moved to the spring by the lift surface of the cam. A water jet loom that supplies pressure water according to the spring force to the weft inserting nozzle by displacing the plunger to retract the plunger to allow the pump to absorb water and release the cam follower from the lift surface of the cam. In the weft inserting device, an on-off valve is provided between the pump and the weft inserting nozzle,
During the first weft insertion after starting the loom, at the latest when the pressure water actually starts to be supplied from the pump,
A weft inserting device for a water-jet loom, characterized in that the on-off valve is closed until the regular start timing of pressure water supply.