JPH0210139Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a stop stop prevention device in a loom, and is designed to apply special warp tension at the time of start-up, especially in relation to the opening/closing movement of the warp threads. be.

BACKGROUND ART Conventionally, in a loom, a guide body applies a predetermined tension to warp threads pulled out from a yarn beam and guides them to a loom. When the loom is stopped in the middle of weaving, a predetermined tension remains on the warp threads.
The warp threads will stretch slightly before restarting, but due to this warp thread elongation and lack of reed striking force due to insufficient rotational force immediately after restarting, the warp threads may stretch several times during restarting. There was a problem in that the part became a thin step and a so-called stop step occurred.

Many proposals have been made to solve these problems, for example,
As disclosed in No. 154541, the easing lever is pivotally supported so as to swing, a support lever is rotatably supported at the tip of the easing lever, and a warp guide is supported at the tip of the support lever. The lever is elastically supported and urges the guide body to apply a predetermined tension to the warp threads, and this guide body is further connected to a lever that swings in conjunction with the loom to adjust the tension change due to opening and closing of the warp threads. A link that is hinged and can be bent and stretched within a predetermined range is inserted in the connection system between the guide body and the lever, and this link is operated for a predetermined period of time with the start signal of the loom to extend the link. Some devices tend to increase the applied tension to prevent stoppage.

Problems to be Solved by the Invention In the above-mentioned Japanese Patent Application Laid-open No. 154541/1983, the link is stretched for a predetermined period of time when the loom is started, and the guide body is moved in the tension applying direction. There was a problem in that an excessive constant tension was applied by the guide body even during opening, which was undesirable because it caused warp thread breakage.

Means for Solving the Problems The present invention includes a warp guide provided on the machine frame to apply a predetermined tension to the warp threads and to reduce tension fluctuations caused by opening and closing of the warp threads, and a pivot on the machine frame. A tension-applying roller that is rotatably supported by a swinging lever attached to the loom and capable of applying exceptional tension to the warp threads, a lever swinging means that is synchronized with the opening and closing of the warp threads, and is movable by being activated for a predetermined period of time when the loom is started. A movable body moving device for moving the body from a standby position to an operating position, and a pair of first and second levers provided on the movable body and having connected bases and capable of colliding with each other. The lever and the lever swinging means are connected so that the lever swinging means swings the first lever in the direction of the second lever from near the maximum opening of the warp threads to near the reed beating, and the second lever and the swinging lever Furthermore, the standby and operating positions of the movable body are such that in the standby position, the second lever does not swing due to the swinging of the first lever, and in the operating position, the second lever does not swing due to the swinging of the first lever. configured and configured to run.

According to the above means, when the loom is started, the movable body moving device is activated to move the movable body from the standby position to the operating position, and the first lever is swung by the lever oscillating means associated with the warp opening/closing opening. This oscillation is transmitted to the second lever and the oscillation lever is oscillated to gradually increase the additional tension from near the maximum opening of the warp threads to the vicinity of the reeding, thereby maximizing the additional tension by the tension adding roller during the reeding. On the other hand, the added tension is gradually decreased from near the beating to the maximum opening, and at the time of opening, the added tension by the tension roller is set to the minimum or 0. Pull back to prevent stoppage.

Embodiment In FIG. 1, a weight lever 2 is swingably supported on a machine frame 1. A shaft 3 is fixed to the tip of the weight lever 2, and the upper end of an easing motion lever 5, to which a bracket 4 is integrally attached, is loosely fitted onto the shaft 3. A tension roller 6 serving as a guide for the warp yarns Y is rotatably supported on the bracket 4. The other end of the weight lever 2 and one end of a tension lever 7, which is swingably supported below the machine base, are connected by a link 8 with a pin, and the other end of the tension lever 7 is attached to a yarn beam ( It is connected by a pin to a rod 9 which is connected to a transmission speed change device (not shown). The tension lever 7 is biased by a spring 10, and the tension roller 6 is rotated clockwise via the link 8 and the weight lever 2 to apply a predetermined tension to the warp yarns Y. . One end of a rod 11 is rotatably supported at the lower end of the easing motion lever 5, and the other end is a crankshaft 12, which is exemplified as a lever swinging means that rotates in synchronization with the opening/closing operation of the warp threads Y.
The rotation of the crankshaft 12 causes the tension roller 6 to swing via the easing motion lever 5, thereby reducing tension fluctuations caused by the opening and closing of the warp threads. This tension roller 6
A swing arm 13 is swingably supported on the machine frame 1 upstream of the machine frame 1, and a tension applying roller 14 is swingably supported on the swing arm 13 to guide the warp yarns Y. The swinging arm 13 is in contact with a stopper 15 that restricts its counterclockwise swinging by the tension of the warp yarns Y in a normal woven state, except when the loom is started. Reference numeral 16 denotes a movable body whose intermediate portion is supported by a shaft 17 on the machine frame 1 so as to be rotatable as a whole, and one end of which is connected to the tip of a piston rod 18a of a pneumatic cylinder 18 exemplified as a movable body moving device. , the movable body 16 is placed in the operating position (the state shown in Figure 2) at the forward end and the standby position (the state shown in Figure 1) at the backward end, and the movable body 16 is moved only for a predetermined time when the loom is started. It is designed to be moved from a standby position to an operating position. The bases of a pair of first and second levers 19 and 20, which are able to collide with each other, are connected to the tip of the movable body 16 with pins and are rotatably supported. The tip of the first lever 19 is connected to the easing motion lever 5 via the connecting rod 21, and when the crankshaft 12 is rotated, the warp Y is opened near the maximum opening (main shaft angle 180 degrees, crankshaft condition shown in Fig. 2). ) to near the time of hitting the reed (spindle angle 0
3), the second lever 20 swings toward the state of the crankshaft shown in FIG. Further, the tip of the second lever 20 is also connected to the swing lever 13.
It is connected to the lower end of the body via a connecting rod 22. The standby position and the operating position of the movable body 16 are such that in the standby position, even if the first lever 19 is swung by the crankshaft 12, the second lever 20 is not swung by the movement (the first In the operating position, the first lever 19 collides with the second lever 20, and as the warp Y opens and closes, the tension applying roller 14 is swung clockwise as it moves from the maximum opening to the reeding, thereby applying additional tension. It is set to oscillate so that the opening is gradually increased, and conversely, when it reaches the maximum opening after hitting the reed, it is gradually decreased. Note that 23 is a stopper for positioning the forward end of the pneumatic cylinder 18.

According to such a configuration, when a normal loom starts, the main shaft angle is around 300 degrees, so it is almost in an open state (slightly before the state in Fig. 1), and when the pneumatic cylinder 18 is applied at this time, it opens. The movable body 16, which has been in the standby position until now, reaches the operating position as the cylinder rod 18a advances, and the first lever 19 collides with the second lever 20, causing the swinging arm 13 to move clockwise and the tension applying roller 14 to move the swinging arm 13 clockwise. When additional tension is applied to the warp yarns Y and the main shaft is rotated for further beating, the crankshaft 12 is also rotated in synchronization with this, and the easing lever 5, the connecting rod 21,
First lever 19, second lever 20, connecting rod 2
2, the swinging arm 13 is further moved to the left, and the additional tension is applied to the warp Y by the tension applying roller 14 so as to gradually increase (Fig. 3), and the additional tension reaches its maximum near the reed beating. The fabric is pulled back toward the yarn beam and the stop step is prevented. Then, the easing motion lever 5 swings counterclockwise from the reeding area to the maximum opening area, and the tension applying roller 14 also moves counterclockwise due to the warp tension to gradually reduce the additional tension until it reaches the maximum opening. In the vicinity of the opening, the additional tension is set to 0 or almost 0, and the tension applied to the warp yarns Y is approximately the same as that in the vicinity of the maximum opening during normal woven fabric. After several picks have passed, the piston rod 18a of the pneumatic cylinder 18 is moved to the retreat end, and the movable body 16, which is in a normal woven state, is located at the standby position (Fig. 1), and the warp Y The swinging lever 13 comes into contact with the stopper 15 due to the tension, and even if the first lever 19 swings, it does not collide with the second lever 20, so there is no tension added by the tension applying roller 14, and the state is in the normal tension state. Become.

In this embodiment, the first lever 19 and the crankshaft 12 are connected via the easing motion lever 5, but the crankshaft 12 and the first lever 19 may be directly connected. Furthermore, the movable body moving device is not limited to the pneumatic cylinder, but may be any other actuator.

Effects of the invention As described above, in this invention, when the loom is started, the tension applied to the warp threads is maximized by synchronizing the opening and closing of the loom with the opening and closing of the loom when the loom starts, using the tension roller. The front can be pulled back toward the yarn beam side to prevent a stop stage, and the additional tension can be reduced to almost 0 or 0 near the maximum opening, making it possible to maintain the tension near the normal (not at startup) maximum opening.
Thread breakage near the maximum opening during startup can be prevented.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the present invention, Figure 2 is an enlarged view of the main parts showing the vicinity of the opening, Figure 3 is an enlarged view of the main parts showing the vicinity of the reed beating, and Figure 4 is the vicinity of the first and second levers. It is a figure showing connection. 1... Machine frame, 5... Easing motion lever, 6... Tension roller (guide body), 12...
... Crankshaft (lever swinging means), 13 ... Swing arm, 14 ... Tension applying roller, 16 ... Movable body, 18 ... Pneumatic cylinder (Movable body moving device),
19...first lever, 20...second lever, Y...
...Warp.

Claims (1)

[Scope of utility model registration request] A guide body is rotatably supported on the easing motion lever, and this guide body is biased to apply a predetermined tension to the warp threads, and this guide body is swung in synchronization with the opening/closing opening of the warp threads to open and close the warp threads. In a loom that is designed to reduce tension fluctuations caused by the weaving, a tension-applying roller is rotatably supported by a swinging arm that is pivotally connected to the machine frame, and the tension-applying roller is rotated by the swinging of the swinging arm. The loom is configured such that it can apply tension to the warp threads, and the machine frame is further provided with a lever swinging means that synchronizes with the opening and closing of the warp threads, and a lever swinging means that is activated for a predetermined time when the loom is started to move the movable body from the standby position to the operating position. A movable body moving device is provided, the movable body is provided with a pair of first and second levers whose bases are connected with a pin and are capable of colliding with each other, and the first lever and the lever swinging means are provided with , the lever swing means moves the warp threads from the vicinity of the maximum opening to the vicinity of the reed
The lever is connected so as to swing in the direction of the second lever, the second lever and the swing arm are connected so as to transmit the swing of the first lever to the swing arm, and the movable body is placed on standby. The position and the operating position are set such that in the standby position, the second lever does not swing when the first lever swings, and in the operating position, the second lever swings when the first lever swings. A stop stop prevention device for a loom, which is characterized by: