JPS6018450Y2 - 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 membranes) during startup in a loom.

In conventional looms, the warp threads pulled out from the warp beam are guided to the weaving front while applying a predetermined tension using a back roller as a guide, but even when the loom is stopped in the middle of weaving, Since the state at which the machine was stopped is maintained until it is restarted, the warp threads are left with the same tension as during weaving, and some types of threads have high viscoelasticity and may elongate slightly. .

When elongation occurs in this way, the fabric moves toward the presto beam side, resulting in the problem that the first few picks when restarted become thin films.

For this reason, in order to artificially compensate for the decrease in tension caused by the elongation of the warp threads during the stoppage until it is recovered at the time of restarting, and to return the weaving cloth to the proper position, a predetermined period of time (several picks) after the restart, such as air The present applicant has proposed a weaving bar prevention device in which the output lot of the cylinder is applied to an easing lever that supports a back roller to apply special tension to the warp threads (Japanese Patent Application Laid-Open No. 79632/1983). .

However, with this device, for example, the easing lever that supports the back roller is moved in the tensioning direction and held in that position for several picks at startup, so the actual warp As a result of the displacement of the easing lever, which is unrelated to the tension, being transmitted to the tension lever via the easing spring, the gear shift lever of the transmission for warp delivery control, which is linked to this tension lever, is displaced and becomes different from before the stop. There was a problem in that the loom was started in the unwinding state.

The present invention has been developed by focusing on such conventional problems, and includes a means that moves in synchronization with the loom, such as a cam, and a means that operates in synchronization with the opening and closing of the warp threads for several picks at the start of the loom. The movement means and the guide body are linked together to increase the swinging angle of the guide body to apply special tension to the warp threads during beating, and tension is applied to the warp threads only during beating for a predetermined period of time immediately after starting. and a means for fixing the gear ratio of the warp delivery control transmission by operating for the predetermined period of time to fix the gear ratio while the warp threads are being exceptionally given tension. The aim is to solve the above problems by doing so.

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.The warp 2 pulled out from the warp beam 1 is guided by the back roller 3, and then pulled through heddles and reeds (not shown). I am being guided by Orimae.

The back roller 3 connects its shaft 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 10 attached to the other end of the easing spring 8 is rotatably attached to a pin 13 protruding from a tension lever 12 which is fixed by fitting a square hole 12a into a torsion bar (the square shaft portion thereof) 11. The nut 1 is passed through the tip of the pivoted threaded rod 14 and is screwed onto the threaded rod 14.
5 is engaged with a transparent window 10a formed in the support bracket 10.

The tension lever 12 is rotatably connected to a piston rod 18 of a piston-type oil damper 17 by a pin 16, and the cylinder case 19 of the oil damper 17 is rotatably supported by a pin 20 protruding from the frame 4.

A rod 2 is attached to a pin 21 protruding from the tension lever 12.
One end of the rod 22 is rotatably connected, and the other end of the rod 22 is rotatably connected to a speed change lever 24 of a continuously variable transmission 23 by a pin 25.

22a is a length adjustment mechanism provided at both ends of the rod 22.

The continuously variable transmission 23 changes its gear ratio depending on the rotational position of the gear lever 24 (H in the figure is the high speed side, L is the low speed side), and the input shaft (not shown) is connected to the drive motor of the loom. The gear 27 fixed to the output shaft 26 is rotatably supported by the frame 4 at one end of the transmission shaft 28 (
The gear 29 (not shown) fixed to the other end of the faJ shaft 2B (inside the frame 4) meshes with the gear 29 fixed to the side of the warp beam 1 (not shown). ) and mesh with each other.

Thus, while visually observing the dial gauge 30 fixed to the frame 4 of the loom, the torsion bar 11 is rotated clockwise in the figure by an amount set depending on the type of warp threads 2, etc., and then the tension lever 12 is turned. As described above, they are fitted and fixed, and a counterclockwise moment is applied thereto, thereby biasing the easing lever 6 clockwise via the easing spring 8, and applying a desired tension to the warp threads 2 via the back roller 3. .

Here, the guide body, that is, the back roller 3 oscillates due to the tension fluctuation caused by the opening and closing of the warp threads 2. This oscillation movement is transmitted to the easing lever 6 and causes it to oscillate, but the easing spring 8 and the oil damper 17 buffer it. The tension lever 12 is hardly swung.

Then, as the winding diameter of the warp beam 1 decreases as weaving progresses, the sending speed of the warp threads 2 decreases, the tension of the warp threads 2 increases, and the swinging center of the easing lever 6 is line) counterclockwise in the figure, the tension lever 1 is rotated via the easing spring 8.
2 is rotated clockwise.

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 2 The tension is corrected.

Here, an eccentric cam 41 is fixed to a rotating shaft 40 that rotates in synchronization with the loom, and a cam follower 44 attached to the tip of a lever 43 rotatably pivoted to a fixed shaft 42 is attached to the eccentric cam 41. It's a shame.

Then, a spring 47 is stretched between a pin 45 protruding from the lever 43 and a pin 46 protruding from the frame 4.
By biasing the lever 43 clockwise in the figure, the cam follower 44 is brought into contact with the eccentric cam 41.

Further, a joint rond 48 is rotatably connected to the pin 45 of the lever 43, and the tip of the joint rond 48 is connected to one end of a bell crank 50 whose intermediate portion is rotatably connected to the fixed shaft 49. It is connected.

A lever 52 is rotatably attached to the other end of the bell crank 50 by a pin 51, and the tip of the lever 52 is inserted into a guide 53 fixed to the frame 4 with some play.

A brake shoe 54 is fixed to the side of this lever 52, and this brake shoe 54 is attached to the easing lever 6.
This is opposed to a brake piece 55 fixed to the end of the brake piece.

Then, an electromagnetic actuator 57 is attached to the frame 4 via a bracket 56, and the roller 59 attached to the tip of the output rod 58 is placed opposite to the side of the lever 52 opposite to the side to which the brake shoe 54 is fixed. It is.

Reference numeral 60 denotes a spring that biases the lever 52 clockwise in the figure, that is, toward the roller 59 side.

The electromagnetic actuator 57 is energized when the warp is closed during a predetermined pick after receiving a loom start signal using, for example, a timer. In the energized state, the output lot 58 protrudes and pushes the lever 52 through the roller 59. Turn the brake shoe 54 counterclockwise to the brake piece 5.
5.

Further, the eccentric cam 41 is configured such that its short diameter portion comes into contact with the cam follower 44 when the warp is closed, and the lever 52 is pulled down at this time.

Next, the means for fixing the gear ratio will be explained. One end of a brake piece 62 is rotatably attached to a pin 61 protruding from the tension lever 12, and the other end of this brake piece 62 is attached to the frame 4. It is slidably inserted into the attached guide 63.

Reference numeral 64 denotes a receiving member protruding from the frame 4, and is arranged so as to come into sliding contact with the intermediate portion of the brake piece 62.

Further, an electromagnetic actuator 66 is attached to the frame 4 via a bracket 65, and a brake shoe 68 is fixed to the tip of an output rod 67 of the electromagnetic actuator 66.

The brake shoe 68 faces the receiving member 64 with the brake piece 62 interposed therebetween.

The electromagnetic actuator 66 is energized during the predetermined pick, and at this time the output rod 67 is projected.

The operating circuit of the electromagnetic actuator 66 and the electromagnetic actuator 57 is shown in FIG.

The electric circuit A includes a normally open automatic return type push button switch 85 for starting auxiliary equipment (such as a blower), and a normally closed contact 8 of a relay 84 to be described later.
4a and a relay 87 are connected in series, and a normally open contact 87a of the relay 87 is connected in parallel to the switch 85.

The normally open contact 87b1 of the relay 84, the normally closed contact 84b1 of the relay 84, the normally open push button switches 86 and 88 for starting the loom drive motor are connected in series to the electrical circuit B, and the switch 86 is connected in parallel to the normally open contact 84b1 of the relay 84. A normally open contact 88a is connected.

Normally open contact 87c1 of relay 87 is connected to electric circuit C. Relay 84
A normally closed contact 84, an electromagnetic solenoid 57s of the C% actuator 57, and a normally closed contact 92a of an operating circuit 92, which will be described later, are connected in series.

The normally open contact 87d of relay 87 and IJ relay 84 are connected to the power line.
A normally closed contact 84d1, an electromagnetic solenoid 66s of the electromagnetic actuator 66, and a normally closed contact 92b of the operating circuit 92 are connected in series, and a normally open contact 94a of a relay 94, which will be described later, is connected in parallel with the contacts 87d and 84d. (Cable D').

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 electric line E.

The normally open contact 84e of the relay 95 and the relay 84 is in the electric circuit F.
are connected in series.

The normally open contact 95a of the relay 95, the normally closed contact 87e of the relay 87, and the relay 94 are connected in series to the electrical circuit G, and the normally open contact 95a of the relay 94 is connected in parallel to the contact 95a.
4b is connected.

These electric lines A to G are connected to a power source 96 in parallel.

Reference numeral 88 denotes a rotating shaft that rotates once per rotation of the loom, and an operating piece 89 is fixed to it.

A proximity switch 90 is disposed 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 which, when a preset number of pulses corresponding to the time to apply special tension to the warp threads after starting the loom, is input from the proximity switch 90, a reset signal is sent from the stop circuit 93. Continue outputting the signal until input.

Reference numeral 92 denotes an operating circuit, to which a signal from the counting circuit 91 is input and which operates to open the contacts 92a and 92b.

Reference numeral 93 denotes a stop circuit, which is connected to a weft detector (not shown), a warp thread breakage detector, a selvage thread breakage detector, and a manual stop device, and detects mispicks, warp thread breaks, and selvage thread breaks, or is connected to a manual stop device. is actuated and the contact 9 is actuated.
Close 3a.

This stop circuit 93 is also connected to the reset terminal of the counting circuit 91.

Incidentally, when a mispick or a warp breakage is detected, or when the manual stop device is activated, a pulse-like signal is input to the stop circuit 93, and the contact 93a is closed only while this signal is being input.

Therefore, when the push button switch 85 is closed when restarting the loom, the relay 87 is activated and its contact 8
7a to 87d are closed, and contact 87C is opened.

As a result, the electric circuit A is self-maintained and the auxiliary equipment is activated.

Further, the electromagnetic solenoid 57s of the electric circuit C is energized, the actuator 57 is operated, and the output rod 58 protrudes.

At the same time, the electromagnetic solenoid 66s in the electric circuit is excited, the electromagnetic actuator 66 is operated, and the outlet rod 67 is protruded.

Next, when the push-button switch 86 is closed, the relay 88 is activated, its contact 88a is closed, the electric circuit B is self-maintained, and the loom drive motor is activated.

This causes the loom to rotate, and the action piece 89 causes the proximity switch 90 to send out a pulse every time the loom rotates once, so if the counting circuit 91 is set to the preset number 3, An output signal is transmitted from the counting circuit 91 at the 3rd rotation, that is, at the 3rd pick, and this output signal operates the operating circuit 92, and from then on, the contact 92 of the electric circuit C is
a and the contact 92b of the electric circuit 1) are kept open.

At this time, the electromagnetic solenoid 57s is demagnetized, the electromagnetic actuator 57 is inactive, and the output lot 5
8 is pulled in and the lever 52 is moved to the second position by the spring 60.
The electromagnetic solenoid 66 is rotated clockwise in the figure.
s is demagnetized, the electromagnetic actuator 66 also becomes inactive, the output rod 67 is retracted, and the brake piece 62 and brake shoe 68 are separated.

When the 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 electric circuit E is closed, the relay 84 is activated, and the contacts 84a to 84d are also opened. Relays 87 and 88 also become inoperable and self-holding is released, and electric circuits A, B, C,
D is opened.

Therefore, after a predetermined time, contact 93a opens and relay 8
Even if circuit 4 becomes inoperable, circuits A, B, C, and D remain open.

Further, the contact 84e of the relay 84 is closed for a predetermined time,
At this time, the relay 95 is activated to close the contact 95a of the electric path G, and the relay 94 is activated to close the contact 94b, so that the electric path G is self-maintained.

Then, since the contact 94a of the relay 94 is also closed, the electric circuit D' is closed, and thereby the electromagnetic solenoid 66s of the electromagnetic actuator 66 is energized.

In other words, the electromagnetic actuator 66 operates continuously from when the loom is stopped until a predetermined jump when the loom is restarted.

Restarting after stopping is performed in the same manner as described above.

Next, the effect will be explained.

When the loom is started, the eccentric cam 41, which is a movement means, is moved by the rotating shaft 40, which rotates in synchronization with the loom, so that when the warp threads 2 are shedding, the long diameter part of the eccentric cam 41 comes into contact with the cam follower 44 as shown by the solid line in the figure. portion comes into contact with the cam follower 44 as shown by the chain line in the figure.

When the contact point of the cam 41 against the cam follower 44 moves from the long diameter portion to the short diameter portion, the lever 43 is rotated clockwise in the figure, and the bell crank 50 is further rotated counterclockwise in the figure via the joint rod 48. rotated in the direction of
Lever 52 is pulled down.

At the time of starting, the electromagnetic actuator 57 is energized to a predetermined value, the output rod 58 and therefore the roller 59 protrude, and the lever 52 is rotated counterclockwise against the spring 60, thereby resisting the brake shoe 60. and rotate it counterclockwise to press the brake shoe 54 against the brake piece 55 of the easing lever 6.

Since the lever 52 is pulled down each time the warp threads 2 are closed, that is, when reeding, the easing lever 6 is dragged by the frictional force between the brake shoe 54 and the brake piece 55, and is rotated clockwise. .

As a result, the tension applied to the warp threads 2 increases, the fabric is returned to its proper position, and beating is performed at this time.

Further, during a predetermined pick at the time of starting, in which the tension applying action described above is performed intermittently, the electromagnetic actuator 66
is activated, that is, the output rod 67 protrudes to the left in the figure, pushes the play piece 62 with the brake shoe 68, and pushes the receiving member 6.
4, the tension lever 12 is held in a fixed state by braking the brake piece 62.

As a result, the shift lever 24 of the transmission 23 no longer moves.

Since the electromagnetic actuator 66 operates even when the loom is stopped, the position of the back roller 3 is fixed, and the elongation of the warp threads during the stoppage is reduced.

FIG. 2 shows yet another embodiment.

To explain the different parts, one end of a bell crank 71 whose intermediate portion is rotatably pivoted to a fixed shaft 70 is connected to an output rod 74 of an air cylinder 73 via a joint rod 72.

An intermediate portion of another bell crank 76 is rotatably connected to the other end of the bell crank 71 by a pin 75, and one end of this bell crank 76 is connected to the easing lever 6 via a joining rod 77. be.

Additionally, a cam follower 83 is provided at the other end of the bell crank 76.
The cam follower 83 is placed opposite to an eccentric cam 79 fixed to a rotating shaft 78 that rotates in synchronization with the loom.

The air cylinder 7.3 is supplied with pressurized air from a pressurized air supply source (not shown) via a three-way solenoid valve 80, and when pressurized air is supplied, the output rod 74 is retracted and the joint is closed. The bell crank 71 is rotated clockwise in the figure via the rod 72.

81 is a pin 82 protruding from the frame 4 and a bell crank 7
This is a return spring stretched between the pin 75 of No. 1 and the pin 75 of No. 1.

The three-way solenoid valve 80 is energized for a predetermined pick after receiving the loom starting signal, and at this time the air cylinder 73 is energized.
When demagnetized, air cylinder 7 is supplied with pressurized air.
It is designed to exhaust the pressurized air inside 3.

Further, the eccentric cam 79 is configured such that its long diameter portion faces the cam follower 83 when the warp threads are closed.

To explain the operation, at startup, the three-way solenoid valve 80 opens until the predetermined pick number, and pressurized air flows into the air cylinder 73.
The output rod 74 is pulled downward, and the bell crank 71 is held in a clockwise rotated state via the joint rod 72.

Therefore, since the position of the pin 75 changes, the bell crank 7
6 is moved clockwise as a whole, and the cam follower 83 does not come into contact with the short diameter portion of the cam 79, but comes into contact with the long diameter portion.

Therefore, due to the rotating shaft 78 rotating in synchronization with the loom, the long diameter portion of the cam 79 is moved to the cam follower 8 when the warp threads 2 are closed.
3, the bell crank 76 is rotated counterclockwise and the easing lever 6 is rotated clockwise via the joint rod 77.

As a result, the tension applied to the warp yarns 2 increases, and the woven fabric is returned to its proper position, at which time beating is performed.

Further, when the opening is closed, the short diameter portions of the cam 79 face each other, so that they do not come into contact with the cam follower 83 of the bell crank 76, and the easing lever 6 can freely move at this time.

Then, after passing a predetermined pick, the three-way solenoid valve 80 is demagnetized and the pressurized air is discharged, the air cylinder 73 becomes inactive, and the bell crank 71 is rotated counterclockwise by the return spring 81. The easing lever is no longer affected by the cam 79 at all, and the easing lever can move freely in this case as well.

Therefore, this embodiment also has the same effects as the previous embodiment.

In addition, when applying special tension to the warp threads at the time of starting,
Tension is not limited to being applied to the warp threads via the back roller by the easing lever, but tension may also be applied by causing an engaging body to act directly on the warp threads.

As explained above, according to the present invention, special tension is applied to the warp threads only during the beating of the warp for a period of time at startup, and the gear ratio is fixed, so that the influence of tension application on the sending action is reduced. It can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view of a main part of a loom showing one embodiment of the present invention, FIG. 2 is a side view of a main part of a loom showing another embodiment, and FIG. 3 is an operating circuit diagram of an electromagnetic actuator. 1... Warp beam, 2... Warp, 3
... Back roller, 6 ... Easing lever, 8 ... Easing spring, 11.
...Torsion bar, 12...Tension lever, 23...Transmission, 41...
Eccentric cam, 52... Lever, 54...
Brake shoe, 58... Solenoid actuator, 73... Air cylinder, 79... Eccentric cam, 80... Three-way solenoid valve.

Claims (1)

[Scope of utility model registration request] The warp threads pulled out from the warp beam are guided by an elastically supported guide body and guided to the fabric front, and the guide body is swung according to the fluctuation of the tension of the warp threads to apply a predetermined tension to the warp threads. In a loom that detects the tension and adjusts the gear ratio of the transmission for warp delivery control so as to keep the warp tension almost constant, there is provided a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom, and a means for moving in synchronization with the loom. means that operate for a time to increase the swing angle by coordinating the means and the guide body to apply special tension to the warp threads during beating, and means that operate for at least the predetermined time to fix the gear ratio. A loom step prevention device for a loom, characterized in that it is provided with.