JP3500327B2 - Weaving loom prevention device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loom stop device for a loom, and more particularly to a tension roll around which a warp drawn from a warp beam is wound, and a weight for pulling down a weight connected to the tension roll. In a weaving machine provided with a rotatable weight lever that biases a tension roll in a direction of applying tension to a warp by a force, a holding device that is connected to the weight lever and holds the rotation position of the weight lever while the loom is stopped. The present invention relates to the improvement of a device for preventing the generation of a loom due to the stop of a loom.

[0002]

2. Description of the Related Art In a loom, a warp drawn from a warp beam is guided while being wound around a plurality of rolls such as tension rolls and guided to the cloth fell side. Utilizing the pulling down force by
2. Description of the Related Art Conventionally, a tension adjusting device has been used which applies a tension via a tension roll to make the tension of a warp constant.

This tension adjusting device includes, for example, a weight lever rotatably supported in a vertical direction with respect to a frame of a loom, a weight is hung on one end of the weight lever, and a tension roller is provided on the other end. The shaft is rotatably supported and linked so that the pulling down force of the weight acts as a force for urging the tension roller in the direction of applying tension to the warp.

Further, such a tension adjusting device is generally adopted in a loom, which is a mechanical drive device in which the feeding device is driven, and a weight lever is connected to the transmission. However, it is also used as a device for operating a transmission so as to adjust the amount of warp fed out according to the amount of displacement of the weight lever.

In the loom equipped with the tension adjusting device as described above, when the pulling down force of the weight continues to act as the urging force to the tension roll even when the loom is stopped,
Not only does it damage the warp and reduce its characteristics,
There is a problem that a weaving stage is generated in the woven fabric immediately after the restart.

The cause of such weaving bars is
This is because the tension of the warp threads is loosened while the loom is stopped and the weight lever is displaced accordingly, so that the amount of the warp threads fed out at the time of restarting is largely changed (decreased) as compared with that before the stop. In addition, examples of the cause of the looseness of the warp tension during the stop include the elongation of the warp and the aligning operation after the defective yarn is removed when the cause of the stop is weft insertion failure.

[0007] In order to solve the above problems,
Japanese Patent Laid-Open No. 1-5564 proposes to provide a holding means that operates when the loom is stopped and holds the weight lever at a rotation position when the loom is stopped. In this conventional technique, the weight lever is held at the rotation position when the loom is stopped while the loom is stopped, and the feed amount at the time of restart is maintained in the same state as before the stop, so that the occurrence of the loom as described above is prevented. The purpose is to prevent.

[0008]

However, in the case of this prior art, the turning position of the weight lever is maintained without considering the fluctuation (loosening) of the warp tension when the loom is stopped. Therefore, upon restarting, the weight lever is abruptly displaced, which causes a problem that a weaving bar is formed in the woven fabric.

That is, even when the urging force from the tension roll does not act on the warp while the loom is stopped, the warp is stretched by its own weight or the direction in which the tension is relaxed by the above-mentioned mouth-matching operation. Becomes On the other hand, the position of the weight lever cannot be displaced. Therefore, the position of the weight lever while the loom is stopped is maintained at a position where the urging force acting on the tension roll via the weight lever due to the pulling down force of the weight does not balance with the tension of the warp.

Therefore, when the holding means is deactivated at the same time as the loom is restarted, the position of the weight lever is abruptly displaced downward by the pulling down force of the weight so that the position of the weight lever is balanced with the tension of the warp. Moreover, since the weight, the tension roll, and the like are heavy items, the inertia of them causes the weight lever to be largely displaced without staying in a position where the warp tension is balanced. As a result, the amount of warp fed out becomes very small, and the tension of the warp sharply increases accordingly. Then, the weight lever shifts to the upward displacement in order to follow the sudden increase in the tension of the warp. In this way, the weight lever is repeatedly displaced up and down, and its position becomes violent, so that the warp feed amount is not appropriate and the weaving such as thin and thick steps continues until it is converged. A step is generated.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a device for reducing the generation of loom caused by the stop of the loom.

[0012]

Means for Solving the Problems The structure of the present invention for attaining the above-mentioned object is constituted by a tension roll around which a warp drawn from a warp beam is wound, and a pulling down force of a weight connected to the tension roll. In a loom including a rotatable weight lever for urging a tension roll in a direction of applying a tension to a warp, and a holding device which is connected to the weight lever and holds a rotational position of the weight lever while the loom is stopped, The gist of the holding device is that the holding device is connected to the weight lever so as to allow the turning of the weight lever to a turning position when the loom is stopped by a predetermined amount in the direction of applying tension to the warp. To do.

Further, the holding device is provided with a fixing means fixed to a frame of the loom, a position holding means provided so as to be movable relative to the fixing means, and a relative movement possible with respect to the position holding means. And a stop member that is connected to the weight lever and follows the rotation of the weight lever, and a blocking unit that operates when the loom is stopped and blocks relative movement of the position holding unit with respect to the fixing unit. Even if the driven member and the driven member are capable of partially contacting each other, and the position holding means is provided with a distance holding means for moving the contacting portions of the two while maintaining a predetermined distance when the blocking means is inoperative. The spacing means may be made of an elastic member.

Further, the holding device may deactivate the blocking means after a predetermined period has elapsed from the restart of the loom.

[0015]

According to the above construction, the holding means operates in a state where the holding means is allowed to rotate a predetermined amount in the direction in which the tension is applied to the warp with respect to the turning position of the weight lever when the loom is stopped. Even when the warp tension tends to relax, the tension variation is compensated by the amount corresponding to the predetermined amount of rotation, and the feeding amount is adjusted accordingly. Therefore, the position of the weight lever when stopped is closer to the position where it balances the tension of the warp, and the position deviation due to the displacement of the weight lever after restart is smaller than that of the conventional device, and the weaving after restart is performed. It is possible to reduce the occurrence of weaving bars. In addition, the rotation of the weight lever when the loom is stopped is regulated within a preset range as compared with a device that does not have a holding means, and thus fluctuations in the delivery amount immediately after restarting are reduced and the loom is wound on the woven fabric. It can be prevented from occurring.

Further, by constructing the holding device mechanically as described above, it is possible to carry out without complicated electric control.
The stop stage can be prevented with a simple configuration.

Further, by disabling the blocking means of the holding device after the lapse of a predetermined period from the restart of the loom, it is possible to further reduce the position deviation due to the displacement of the weight lever after the restart, and after the restart. It is possible to further eliminate the occurrence of a weaving bar in the weaving of.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the periphery of a warp beam 11 of a loom 10 to which the present invention is applied. A warp T drawn from the warp beam 11 is wound around a guide roll 12 and a tension roll 13, Both rolls 1
It is guided toward the cloth fell side while being guided by Nos. 2 and 13.
The warp yarn T is pulled through a heddle frame (not shown) arranged between the tension roll 13 and the cloth fell, and an opening motion is performed at a predetermined weft insertion timing.

The tension roll 13 is attached to a shaft 14 rotatably supported by a frame 10a of the loom 10 and the shaft 1
Bracket non-rotatably attached to 4 (not shown)
Is supported through the center of the shaft 14 and the arrow K
It is rotatable in the direction of 1. In addition, this shaft 14
Is a bracket 10 fixed to the front surface of the frame 10a.
It is rotatably supported by b. Further, the shaft 14 is fitted into the guide roll 12 and also rotatably supports the guide roll 12.

A tension adjusting device 20 for applying tension to the warp yarn T is connected to the tension roller 13 via a shaft 14. This tension adjusting device 20 includes a shaft 14
Of the tension lever 21, one end of which is connected to the other end of the tension lever 21 via a tension rod 22 and the other of the weight lever 23. And a weight 25 hung on the end.

The tension rod 22 and the tension lever 21 are connected via an easing spring 24. In addition, this easing spring 24
Is provided in order to absorb the tension fluctuation of the warp yarn T accompanying the shedding motion during one cycle of the loom.

The weight lever 23 extends forward of the base end portion 23a, and the weight 25 is hung on the arm portion 23.
b is an L-shaped member including a connecting portion 23c extending below the base end portion 23a and connected to the tension rod 23. The base end portion 23a is a shaft fixed to the side surface of the frame 10a. It is rotatably supported by 26.

With these constructions, the tension adjusting device 20
The pulling down force due to the weight of the weight 25 acts as a force for rotating the weight lever 23 about the shaft 26 in the direction of the arrow K2, and accordingly, the tension rod 22 is moved toward the connecting portion 22a side with the weight lever 23. Force of. The force acting on the tension rod 22 is transmitted to the tension lever 21 via the easing spring 24 and acts as a force for rotating the tension lever 21 in the counterclockwise direction about the shaft 14. Therefore, a counterclockwise torque corresponding to the pulling down force of the weight 25 acts on the shaft 14, which causes the tension roll 13 to rotate.
Is urged in a direction to apply tension to the warp yarn T via a bracket (not shown).

According to this tension adjusting device 20, the tension of the warp thread T and the pulling down force of the weight 25 are always kept in balance, in other words, the tension of the warp thread T corresponds to the pulling down force of the weight 25. The size is kept constant. Therefore, when the tension of the warp yarns T fluctuates from a certain balanced state, the tension roll 13, the weight lever 23, etc. are displaced accordingly in order to maintain the balanced state.

Weight lever 23 of tension adjusting device 20
Is connected by a rod 31c to a shift shaft 31a of a transmission 31 in a drive device 30 for driving the warp beam 11. Therefore, the weight lever 23 as described above
Is transmitted to the transmission 31 via the rod 31c,
The rotation speed of the output shaft 31b of the transmission 31 is adjusted according to the tension fluctuation of the warp T.

The rotation of the output shaft 31b of the transmission 31 goes through the change gears 30a and 30b at a predetermined gear ratio, and then through a bevel gear and a worm gear (not shown) in the delivery gear box 32. , From the gear 32a to the beam gear 11a. In this way, the warp beam 11 is rotationally driven at a predetermined feeding speed, the warp yarns T are sequentially fed out as the weaving progresses, and
The feeding amount is adjusted according to the fluctuation of the tension.

In the loom 10 provided with the warp T tension adjusting device 20 and the warp beam 11 driving device 30 as described above, in the present invention, the weight lever 23 is provided while the loom is stopped.
The holding device 40 for holding the rotation position of the. The holding device 40 is attached to the side surface of the delivery gear box 32 by a bracket 40a, and is connected to the weight lever 23 by a rod 40b.

As shown in FIGS. 2 and 3, the holding device 40 includes an electromagnetic brake including a fixing means 41 and a position holding means 42, and a driven lever (driven member) supported by a shaft 40c supporting the electromagnetic brake. ) 43.

The fixing means 41 is a fixed iron core (stator) of a so-called electromagnetic brake, and is fixed to the bracket 40a via the flange portion of the shaft 40c. Further, the electromagnetic coil 44a and the brake line 44b, which are blocking means, are fixedly installed in the fixing means 41 so as to face the position holding means 42. The electromagnetic coil 44a is connected to an energizing circuit (not shown) of the loom 10 and is excited when the loom is stopped to generate an attractive force.

The position holding means 42 includes a rotating drum 42a which is rotatably supported by a shaft 40c, and a movable iron piece (armature) 42b which is supported by an end surface of the rotating drum 42a on the side of the fixing means 41 so as to be able to come into contact with and separate from it. The rotary drum 42a and the movable iron piece 42b are connected by a leaf spring (not shown) provided therebetween.

The driven lever 43 is located at a position opposed to the end surface of the rotating drum 42a opposite to the fixing means 41.
The fixed drum 42 is rotatably supported by the shaft 40c.
It is rotatable relative to a. Further, the driven lever 43 is connected to the weight lever 23 via the rod 40b.
And is rotated on the shaft 40c following the rotation of the weight lever 23.

In the holding device 40 having these structures, a locking member 45 capable of contacting the driven lever 43 is attached to the rotating drum 42a of the position holding means 41. The locking member 45 is a shaft-shaped member that is threaded over the entire length, and is screwed into a stay 42c attached to the end surface of the rotating drum 42a on the side of the driven lever 43, and is positioned by the nut 45a. Installed. Further, with this configuration, the locking member 45 can adjust the protruding length from the lower end of the stay 42c by loosening and rotating the nut 45a.

Further, the stay 42c has a rotating drum 4
2a is rotatable, in other words, the electromagnetic coil 43
In order that the rotating drum 42a is driven by the rotation of the driven lever 43 in the state where a is in the non-excitation state and the blocking means is inactive, and the stay 42c and the driven lever 43 maintain a predetermined distance. The space holding means 46 is attached.

The space holding means 46 comprises a shaft member 46a and two compression springs 46b, 46b. Shaft member 46
The a is screwed to the stay 42c with a small-diameter screw portion 46a1 formed at the tip, and a nut 46c is screwed to the tip, and is attached to the stay 42c in a positionally fixed state. In addition, the shaft member 46a has a small diameter portion 4 in the middle.
6a2, a through hole 43 formed in the driven lever 43.
It is loosely inserted in a. The small diameter portion 46a2 and the through hole 43
"a" is set to have a diameter such that the small diameter portion 46a2 does not prevent the driven lever 43 from rotating by a predetermined amount.

The shaft member 46 arranged in this way
A compression spring 46b is interposed between the stay 42c and the driven lever 43 and between the driven lever 43 and the collar portion 46a3 provided at the rear end of the shaft member 46a. Therefore, the driven lever 43 is provided between the stay 42c and the collar portion 46a3 of the shaft member 46a.
It is held at a position where the spring forces of b and 46b are balanced.

According to the holding device 40 having the above-mentioned structure, the driven lever is set by setting the electromagnetic coil 44a in a non-excited state during the weaving to deactivate the blocking means and set the rotating drum 42a in a rotatable state. 43 and rotating drum 42a
And is driven by the rotation of the weight lever while maintaining the positional relationship defined by the balance between the compression springs 46b and 46b.

When the loom 10 is stopped for some reason, the holding coil 40 energizes the electromagnetic coil 44a based on the stop signal. This allows
The electromagnetic coil 44a is in an excited state and an attractive force is generated,
The movable iron piece 42b of the position holding means 42 is adsorbed. Therefore, the position holding means 42 is the fixing means 41 and thus the loom 1
It becomes impossible to rotate relative to the zero frame 10a.

On the other hand, the driven lever 43 serves as the position holding means 4
The relative position to 2 is not fixed and both compression springs 4
Since the positional relationship is only maintained by the balance between 6b and 46b, a force in the rotational direction acts on this balanced state, so that the compression spring 46b can be rotated against the spring force. ing.

Therefore, even when the tension of the warp thread T is loosened during the stop, the driven lever 43 can be rotated to the position (the one-dot chain line in FIG. 2) where it is brought into contact with the locking member 45, and the weight lever 23 is also moved to this. Since they can be displaced together, the variation in tension of the warp T corresponding to this displacement is compensated. Therefore, the loom 10 is restarted in a state in which the position of the weight lever is closer to the position where the tension of the warp T is balanced as compared with the conventional case.

In the above description, the distance to the lockable member 45 on which the driven lever 43 is rotatable, that is, the "predetermined amount" in which rotation is allowed in the present invention, depends on the type of warp. At the same time, the operator shall set it appropriately in consideration of the influence on the warp when stopped and the influence on the weaving after the restart. Further, the setting may be performed by adjusting the protruding length of the locking member 45 from the stay 42c as described above.

Further, in the holding device of the present invention, the holding device is not inactivated at the same time as the conventional loom 10 is restarted, unlike the prior art,
It is preferable that the inactive state is set after a lapse of a predetermined period.

That is, in the holding device 40 of the present invention, the weight lever 23 is allowed to rotate by a predetermined amount even in the inoperative state. Therefore, even if the loom 10 is restarted while the holding device 40 is in the operating state, the amount of the warp T fed out is adjusted within the range of the predetermined amount. Therefore, even when the holding device 40 is in the operating state, the warp yarn T
Since the looseness of the tension is gradually eliminated, even if the holding device 40 is deactivated thereafter, the deviation of the position of the weight lever 23 becomes extremely small. In the conventional device, even if the operating state of the holding means is maintained, since the feeding amount is not adjusted at all, the tension of the warp T remains loose, and as a result, the holding means is restarted at the same time. It is the same as the one that deactivates.

Here, the operator may set an appropriate value in advance for a predetermined period for maintaining the operating state of the holding means 40 in consideration of the kind of the warp yarn T and the like. Further, the tension of the warp yarn T may be detected, and the holding means 40 may be inactivated when the detected value exceeds a predetermined value.

[0045]

Other Embodiments In the above-described embodiment, the holding device is designed to block the rotational movement of the driven lever and the rotary drum due to the rotation of the weight lever 23. However, the present invention is not limited to this, and may be applied to a holding device of the type described in Japanese Utility Model Publication No. 51-5564. Such an example is shown in FIG.

In the example shown in FIG. 4, the holding device 50 has a connecting rod 51, which is a driven member, connected to the weight lever 23 and moves up and down as the weight lever 23 rotates. Further, the connecting rod 51 is provided with a holding block 52 which is a position holding means loosely inserted into the connecting rod 51 in the through hole 52a in a vertically movable manner.
A pair of compression springs 53, 53 is interposed between the holding block 52 and the pair of flanges 51a, 51b provided on the connecting rod 51. In addition, a locking member 51a1 that restricts a distance from the holding block 52 is provided on the upper flange portion 51a. Also, the connecting rod 51
The up and down movement of is guided by the guide members 54, 54.

With this configuration, in the holding device 50, the holding block 52 has the brim portions 51a, 51 of the connecting rod 51.
Between b, the spring forces of the upper and lower compression springs 53, 53 are held at a balanced position, and are driven by the vertical movement of the connecting rod 51 accompanying the rotation of the weight lever 23.

Further, when the loom is stopped, the position of the holding block 52 is held by a blocking means (not shown) such as an electromagnet. As a result, the connecting rod 51 can move against the spring force of the compression spring 53 until the locking member 51a1 abuts the holding block 52, and the weight lever 23 is allowed to rotate by this amount. It In addition,
It is assumed that the blocking means is fixed to the frame of the loom by a fixing means such as a bracket. Further, since the position of the holding block 52 during weaving is displaced as the weaving progresses, the blocking means needs to be able to cover the entire range where the displacement of the holding block 52 is expected.

Further, in any of the above-mentioned embodiments, the rotation of the weight lever 23 when the holding device is operated is allowed by the mechanical structure, but instead of this, it is performed by the electric structure. It may be one. Such an example is shown in FIG.

In the example shown in FIG. 5, the holding device 60 detects the amount of rotation of the holding means 61 connected to the weight lever 23 and the shaft 26 supporting the weight lever, and outputs a pulse signal of a number corresponding to this. The encoder EN and the control device 62 for controlling the operation of the holding means 61. The holding means 61 is configured to hold the turning position of the weight lever 23 during operation, as in the case of Japanese Utility Model Publication No. 51-5564. Also, axis 2
6 is rotatably supported by the frame of the loom, and the weight lever 23 is rotatably supported by the shaft 26.

The control device 62 includes a counter 62a for counting the number of pulse signals output from the encoder 26 while the loom stop signal is output, and the weight lever 2.
Setting device 62b and holding means 6 for setting the allowable rotation amount of No. 3
It is composed of a driver 62c for driving 1

With the above configuration, in the holding device 60, when the stop signal of the loom is output, the counter 62a of the control device 62 starts counting the pulse signals output from the encoder EN. Then, the counter 62a outputs an operation command signal to the driver 62c when the counted number of pulses reaches the number corresponding to the allowable rotation amount set in the setter 62b. The driver 62c operates the holding means 61 based on this operation command signal, and the holding means 61
However, the weight lever 23 is held unrotatable at that time. Therefore, after the loom is stopped, the weight lever 23 is allowed to rotate by the rotation amount set by the fluctuation of the tension of the warp.

Furthermore, the present invention is not limited to any of the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a loom including an embodiment of a weft bar preventing device of the present invention.

FIG. 2 is a front view showing an embodiment of the weft bar preventing device of the present invention.

FIG. 3 is a side view showing an embodiment of the weft bar preventing device of the present invention.

FIG. 4 is a front view of another embodiment of the weft bar preventing device of the present invention.

FIG. 5 is a block diagram of another embodiment of the weft bar preventing device of the present invention.

[Explanation of symbols]

10 loom 10a frame 11 Warp beam 13 Tension roll 20 Tension adjusting device 23 Weight lever 25 weights 30 drive 31 transmission 40 holding device 41 fixing means 42 rotating drum 43 Driven lever 44a electromagnetic coil 45 Locking member 46 Interval holding means

Claims (4)

(57) [Claims] 1. A tension roll around which a warp drawn from a warp beam is wound, and a tension roll which is connected to the tension roll and urges the tension roll in a direction of applying tension to the warp by a pulling down force of a weight. In a loom including a weight lever and a holding device that is connected to the weight lever and holds the turning position of the weight lever when the loom is stopped, the holding device turns the turning of the weight lever when the loom is stopped. A weaving bar preventing device for a loom, which is connected to a weight lever so as to allow a predetermined amount in a direction of applying tension to the warp to a position. 2. The holding device is provided with a fixing means fixed to a frame of a loom, a position holding means provided so as to be movable relative to the fixing means, and a relative movement possible with respect to the position holding means. The position holding means and the driven member are provided with a driven member which is connected to the weight lever and is driven by the rotation of the weight lever, and a blocking means which operates when the loom is stopped and blocks relative movement of the position holding means with respect to the fixing means. Are partially contactable with each other, and the position holding means is provided with a spacing holding means for following the contact portions of the two while keeping a predetermined spacing when the blocking means is inoperative. The loom stop device for the loom according to claim 1. 3. The weaving bar preventing device for a loom according to claim 2, wherein the space holding means is an elastic member. 4. The loom loom preventing device for a loom according to claim 2, wherein the holding device deactivates the blocking means after a predetermined period of time has elapsed since the loom was restarted.