JPS6026849B2 - Loom step prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing weaving steps (particularly thin steps) at the time of start-up in a loom.

In a loom, the warp threads pulled out from the warp beam are guided by a back roller while applying a predetermined tension to the weaving front, but if the loom is stopped during weaving, the warp threads will be pulled out from the warp beam until it is restarted. As the weaving process continues, the warp yarns are left under the same tension as during weaving, and if the stopping time is long, the yarns generally have viscoelasticity, so they may elongate slightly.

When elongation occurs in this way, the fabric front moves toward the presto beam side, resulting in a problem that the first few picks when restarted become thin. In order to solve this problem, a tension lever that is connected to an easing lever that supports the back roller via an easing spring and is biased in a predetermined direction by a weight, for example, is activated in conjunction with the stopping operation of the loom. A braking means is used to maintain the brake while the loom is stopped to prevent the warp from elongating as much as possible (Japanese Utility Model Publication No. 51-5564). In order to artificially compensate and increase the tension until it recovers at restart, for a predetermined period of time (several picks) after restart, for example, the output rod of the air cylinder is applied to the easing lever to apply special tension to the warp threads. Things made like this (Mochigao 54-7963)
2) has been proposed by the applicant.

By the way, since the former method reduces the elongation of the warp threads as much as possible, it is inevitable that thin threads will occur to some extent due to the elongation, while in the latter method thin threads can be prevented, but the We had no choice but to accept the growth, and none of it was satisfactory.

The present inventors have conducted studies to take advantage of the advantages of both. However, when these devices are simply used in combination, the easing lever is pressed by the air cylinder and special tension is applied to the warp threads when restarting, but at this time the braking means of the tension lever is released.
Since the tension lever is moved via the easing spring by the pressing force on the easing lever, the warp delivery amount control mechanism that follows the movement of the tension lever generally causes the loom to be started with a different delivery amount than before it was stopped. There was a problem.

The present invention was made by focusing on such problems.
The above-mentioned problem can be solved by continuing the operation of the braking means from the time the loom stops until the means for applying special tension to the system for a predetermined period of time is released in response to a start signal for restarting the loom. It was designed to solve the problem. An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a warp beam, 2 is a warp, and 3 is a back roller that is a guide. After the warp thread 2 pulled out from the warp beam 1 is guided by the back roller 3, and is pulled through the threads and guided to the fabric.

The back roller 3 connects its ball portion 3a to the frame 4 of the loom.
The easing lever 6 is rotatably supported at one end of an easing lever 6 whose intermediate portion is fixed to a shaft 5 which is rotatably supported.

A pin 7 is provided protruding from the other end of the easing lever 6, and a support bracket 9 attached to one end of an easing spring 8 is rotatably pivoted to the pin 7. A support bracket 01 attached to the other end of the easing spring 8 is attached to a pin 13 protruding from a tension lever 12 which is fixed by aligning a square hole 12a with a square portion of a torsion bar 11 which is a biasing means. Threaded rod 1 pivoted so that it can be rotated freely
A transparent window 10 has a nut 15 screwed onto a threaded rod 14 formed in a supporting bracket 1.
It is locked in a. Tension lever 12 has pin 16
The piston rod 1 of the piston type oil damper 17 is
8, and the cylinder case 19 of the oil damper 17 is rotatably supported by a pin 20 protruding from the frame 4. One end of a rod 22 is rotatably connected to a pin 21 protruding from the tension lever 1-2, and the other end of the rod 22 is connected to a gear lever 2 of a continuously variable transmission 23.
4 by a pin 25 so as to be rotatable.

The continuously variable transmission 23 changes its gear ratio depending on the rotational position of the gear lever 24 (in the figure, day is the high speed side, L is the low speed side), and the input shaft (not shown) is connected to the loom drive motor. A gear 27 fixed to the output shaft 26 meshes with a gear 29 fixed to one end (outside the frame 4) of a transmission shaft 28 rotatably supported by the frame 4, and the transmission shaft 28 is rotated. The gear (
(not shown) meshes with a gear (not shown) fixed to the side surface of the warp beam 1. Thus, the loom frame 4
While visually checking the dial gauge 31 fixed to the tension lever 1, turn the torsion bar 11 clockwise in the figure by an amount set according to the type of warp thread 2, etc.
2 are mated together and fixed as described above, and a counterclockwise moment is applied to them, thereby biasing the easing lever 6 clockwise via the easing pull 8, and applying tension to the hemlock thread via the back roller 3. .

Here, the tension fluctuation due to the opening and closing of the warp threads 2 is transmitted to the easing lever 6 via the back roller 3 and causes it to swing, but is buffered by the easing spring 8 and the oil damper 17, so that the tension lever 12 hardly swings. As the winding diameter of the warp beam 1 decreases as weaving progresses, the delivery speed of the warp yarns 2 decreases, the tension of the warp yarns 2 increases, and the easing lever 6 (oscillates) via the back roller 3. Since the tension lever 12 is rotated clockwise via the easing spring 8, the tension lever 12 is rotated clockwise via the easing spring 8. As a result, the rod 22 is pushed up, the gear lever 24 of the continuously variable transmission 23 is rotated counterclockwise, the gear ratio (reduction ratio) is decreased, the rotational speed of the warp beam 1 is increased, and the warp threads are The tension of 2 is corrected. Here, the tension lever 1
One end of a braked member 33 is rotatably connected to a pin 32 protruding from the frame 4, and the other end of the braked member 33 is slidably inserted into a guide 34 attached to the frame 4.

Reference numeral 35 denotes a receiving member protruding from the frame 4, and is arranged so as to come into contact with the intermediate portion of the brake target section 33.

Further, an electromagnetic actuator 37 is attached to the frame 4 via a bracket 36, and this electromagnetic actuator 37
A brake shoe 39 is fixed to the tip of the output rod 38. The brake shoe 39 faces the receiving portion with the braked member 33 in between. The electromagnetic actuator 37 normally retracts the output rod 38 by a built-in spring (not shown), and is configured to project the output rod 38 when the electromagnetic solenoid 40 (FIG. 3) is energized. ing. Also, frame
A air cylinder 42, which is a means for applying special tension to the warp threads, is fixed to a bracket 41 installed upright in the arm 4, and an engaging body 44 fixed to the outer end of the output rod 43 is opposed to the easing lever 6 so as to be able to come into contact with it. I have let you.

The air cylinder 42 is supplied with pressurized air from a pipe 47 connected to a pressure air supply source (not shown) via a pressure regulating valve 46 via an electromagnetic on-off valve 45 . The detailed structure of the air cylinder 42 will be described with reference to FIG.
The intermediate portion of the output rod 43 is slidably inserted into the slide tube 53 attached to the slide tube 53 .

A piston 54 is fixed to the inner end of the output rod 43,
This piston 54 is slidably inserted into the sling case 50 by iron. A compression spring 55 is interposed between the closing body 52 and the piston 54 to urge the piston 54 upward. A closing body 56 that also serves as the body of the electromagnetic on-off valve 45 is fixed to the upper end of the cylinder case 50, and an air chamber 57 is defined between the closing body 56 and the piston 54.

The closing body 56 also includes an inlet hole 58 to which the pipe 47 is connected, a valve chamber 60 that fits into the inlet hole 58 through a through hole 59, and a valve chamber 60 that connects the air chamber 57. The valve chamber 60 side of the through hole 59 serves as a valve seat 62. The valve body 63 of the electromagnetic on-off valve 45 is
It is attached to the tip of a plunger 64 that movably penetrates the closure body 56 and faces the valve chamber 601.

An electromagnetic solenoid 67 is disposed around the proximal end of the plunger 64 and an iron core 66 that faces the proximal end of the plunger 64 with a compression spring 65 in between. 68 is a cover,
It is fixed to the iron core 66 with a nut 69.

70 is an air vent hole formed in the iron core 66.

In addition, small-diameter discharge ports 71 and 72 are formed in the closing body 56 and branch from the middle of the through hole 61 and close to the outside, and a throttle valve seat 73 is formed between these ports. Reference numeral 74 denotes a throttle valve, which is screwed into the closing body 56 and whose tip faces the throttle valve seat 73, so that the amount of discharged air is adjusted by moving it forward and backward.

75 is a spring for preventing loosening.

Next, the operation circuit of the electromagnetic actuator 37 and the electromagnetic on-off valve 45 will be explained with reference to FIG.

A normally open automatic return type push button switch 80 for starting auxiliary equipment (such as a blower) and for issuing a starting signal, a normally closed contact 84a of a relay 84 to be described later, and a relay 81 are connected in series to Sagiji A. Further, a normally open contact 81a of a relay 81 is connected in parallel to the switch 80. Kamuji B has a normally closed contact 81b of the relay 81 and a normally closed contact 81b of the relay 84.
, a normally open push-down switch 82 and a relay 83 for starting the loom drive motor are connected in series, and the switch 82
A normally open contact 83b of a relay 83 is connected in parallel to the . For ionization C, normally open contact 81c of relay 81, relay 8
A normally closed contact 84c of No. 4, an electromagnetic solenoid 67 of the electromagnetic on-off valve 45, and a normally closed contact 92a of an operating circuit 92, which will be described later, are connected in series. The normally open contact 81 of the relay 81 is in the flyway D.
d, a normally open contact 84d of the relay 84, an electromagnetic solenoid 40 of the electromagnetic actuator 37, and a normally closed contact 92b of the operating circuit 92 are connected in series, and an opening/closing contact 86a of the relay 86, which will be described later, is connected in parallel with the contacts 81d and 84d. are connected (Kameji〇). A relay 84 and a normally open contact 93a of a stop circuit 93, which will be described later, are connected in series to the box E. A normally open contact 84e of a relay 85 and a relay 84 is connected to the turtle path F in series. Relay 85 in Hakoro G
The normally open contact 85a of the relay 81, the normally closed contact 81e of the relay 81, and the relay 86 are connected in series, and the normally closed contact 86b of the relay 86 is connected in parallel to the contact 85a. These electric lines A to G are connected in parallel to a power source 87. 88 is a rotating shaft that rotates once per rotation of the loom,
A working piece 89 is fixed to it.

A proximity switch 90 is arranged close to the rotation path of the working piece 89, and emits a pulse every time the working piece 89 approaches.

Reference numeral 91 is a counting circuit, and when a preset number of pulses is input from the proximity switch 90 as the number of revolutions of the loom within a predetermined period, that is, the time to apply special tension to the warp threads after restarting, from then on, The signal continues to be output until a reset signal is input from the stop circuit 93.

Reference numeral 92 denotes an operating circuit, which operates while the signal from the counting circuit 90 is input to open the contacts 92a and 92b.

Reference numeral 93 denotes a stop circuit, which is connected to a Korean thread detector (not shown), a warp thread breakage detector, a selvage thread breakage detector, and a manual stop device, and is used to detect mispicks, warp thread breaks, and selvage thread breaks, or to operate the manual stop device. When actuated, it operates to issue a pulse signal, that is, a loom stop signal, and open the contact 93c.

This stop circuit 93 is also connected to the reset terminal of the counting circuit 91. Next, the effect will be explained.

When restarting the loom, when the pusher switch 80 is closed, a starting signal for the loom is issued, the relay 81 is activated, its contacts 81a to 81d are opened, and the contact 81e is opened.

As a result, the ionization A is self-maintained and the auxiliary equipment is activated. Further, the electromagnetic solenoid 67 of the electromagnetic C is excited, the electromagnetic on-off valve 45 is engaged, and the air cylinder 42 is operated. That is, the valve body 64 is pulled up by the electromagnetic force, and pressurized air flows into the air chamber 57 via the inlet hole 58, the through hole 59, the valve chamber 60, and the thin hole 61, and pushes down the piston 54 and therefore the output rod 43. Note that even during such air supply, some air is exhausted through the exhaust holes 71 and 72;
The amount of air discharged is extremely small and has no effect. As a result, the output rod 43 comes into contact with the easing lever 6 via the protruding engagement body 44 and rotates it clockwise. Therefore, the tension applied to the warp threads 2 via the back roller 3 increases, the woven fabric returns to its proper position, and thinning is prevented. In addition, as will be described later, when the loom is stopped, ionization D' is closed and the electromagnetic solenoid 40 is energized, but when the contact 81e mentioned above opens, this fin path 〇 opens and the electromagnetic solenoid 40 is demagnetized. At the same time, the fog path D is closed, so the electromagnetic solenoid 40 is excited and the electromagnetic actuator 37 is activated.

That is, the output rod 38 protrudes to the left, pushes the braked member 33 with the brake shoe 39 and clamps it between it and the receiving member 35, brakes the braked member 33, and moves the tension lever 1.
2 is held fixed. Next, when the push nail switch 82 is closed, the relay 83 is activated, its contact 83a is closed, the fin path B is self-held, and the loom drive motor is activated.

This causes the loom to rotate, and the proximity switch 90 sends out a pulse through the action piece 89 every time the loom rotates once, so if the number set in the counting circuit 91 is 3, then the loom rotates 3 times, or 3 times. An output signal is transmitted from the counting circuit 91 to the pick, and the operating circuit 92 is activated by this world power signal, and from then on, the ionization C contact 92a and the turtle path D contact 92 are activated.
Keep b and open.

At this time, the electromagnetic solenoid 67 is demagnetized, the electromagnetic on-off valve 45 is opened, the air cylinder 42 is placed in an inactive state, the electromagnetic solenoid 40 is demagnetized, and the electromagnetic actuator 37 is also in an inactive state.

That is, the valve body 64 of the electromagnetic on-off valve 45 is pressed down by the spring 65 and comes into close contact with the valve seat 62, the through hole 59 is closed, the supply of pressurized air to the air chamber 57 is stopped, and the air chamber 57 is closed. Since the pressurized air is discharged from the discharge holes 71 and 72, the piston 54 and therefore the output rod 43 are gradually pulled up by the spring 55, and the engaging body 44 no longer acts on the easing lever 6. However, since the pressurized air in the air chamber 57 is slowly exhausted from the exhaust holes 71 and 72,
The force exerted on the easing lever 6 by the engaging body 44 gradually decreases and eventually becomes history. Furthermore, the output rod 38 of the electromagnetic actuator 37 is retracted by the built-in spring, and the brake shoe 39 also moves in the same direction, so that the braked portion 33 and therefore the tension lever 12 are released. In other words, until the third pick mentioned above, the tension lever 12 is held in the same position as when stopped, as will be described later, and the easing lever 6 is rotated in the direction of increasing the warp tension.
Alternatively, the rotation in the warp tension decreasing direction is suppressed, and thereafter the tension lever 12 and the easing lever 6 are displaced normally according to the tension of the ridge 2.

When a stop signal is transmitted from the stop circuit 93 for a predetermined period of time, the counting circuit 91 is reset, the contact 93a of the turtle path E is opened, the relay 84 is inactivated, and the contacts 84a to 84d are also opened. Then, 81 and 82 are also inactivated, their self-holding is released, and turtle paths A, B, and C are ignored.

Therefore, even if the support point 93a is opened for a predetermined time and the relay 84 is activated, the ports A, B, and CD remain unconnected. Further, the contact 84e of the relay 84 is closed for a predetermined period of time, and at this time, the relay 85 is activated and the contact 84e of the open path G is closed.
a is closed, the relay 86 is operated and the contact 86b is closed, so the turtle path G is self-held. And relay 8
Since the contact 86a of No. 6 is also opened, the line D' is closed.
As a result, the electromagnetic solenoid 4 of the electromagnetic actuator 37
0 is excited, and the braked member 33 and therefore the tension lever 12 are braked and held in the same way as described above. In other words, the tension lever 12 is continuously braked and held from the time the loom stops until the predetermined pick number when the loom is restarted.
Restarting after stopping is performed in the same manner as described above. Therefore, even if a force is applied to the easing lever 6 at the time of restart, the tension lever 12 is not moved and maintains the position at which it was stopped, so the gear change lever 24 that is linked to it does not move either. When the machine is restarted, it can be started in the same feeding state as in the stopped state, so there is no possibility that a weaving step will occur due to this.

In addition, the engaging body can be moved by an actuator such as a air cylinder.
In addition to the back roller, the tension may be increased by directly engaging the ridge.

When a air cylinder is used as an actuator, there is an advantage that even if the easing lever swings due to the opening/closing opening of the warp threads, the engaging body can sufficiently follow the movement. As explained above, according to the present invention, it is possible to extremely effectively prevent weaving steps without adversely affecting the feed-out amount control mechanism or the like.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention apparatus, in which FIG. 1 is a side view of a thread delivery section of a loom, FIG. 2 is an enlarged sectional view of the main parts of the same, and FIG. 3 is an operating circuit diagram of the same. 1... Warp beam, 2... Warp, 3... Back roller, 6... Easing lever, 8... Easing spring, 11... Torsion bar, 23... Transmission, 33... ... Braked village, 37...
Electromagnetic actuator, 39... Brake shoe, 42.
... Air cylinder, 44 ... Engagement body, 4
5...Solenoid on-off valve. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The warp threads pulled out from the warp beam are guided by a guide member to guide them to the textile fabric, and the guide member is biased by a biasing means to apply tension in a predetermined range to the warp threads, and this tension is increased. In a loom, in which the tension is maintained within the range by increasing the amount of warp threads to be fed, means for braking the biasing means by operating in response to a stop signal of the loom until a predetermined period of time has elapsed after restarting the loom; A loom which operates for the predetermined period of time after restarting in response to a start signal, and which directly or indirectly engages the warp threads to apply tension to the warp threads separately from the biasing means. Weaving step prevention device.