JPH07268742A - Method for opening in weaving machine and device therefor - Google Patents

Abstract

PURPOSE:To enable accurate performance of a desired opening pattern, by surely changing an integrated rotation/a relative rotation of a driving shaft and an eccentric wheel. CONSTITUTION:In an opening motion of a weaving machine, a pair of engaging recessed parts 1a and 1b are formed at a rotation symmetrical position of a half turn of a driving shaft on the peripheral face of the driving shaft 1. Tool stoppers 6 and 7 which are engaged with a connecting wheel 8 to be coupled with a driving force transmission system of a heddle frame 23 and are slidable by rolling along a circular arc-shaped guide 8a of rotators 6a and 7a in housing grooves 2a and 2b of an eccentric wheel 2 relatively rotatably attached to the driving shaft 1. The tool stoppers 6 and 7 are engaged with or disengaged from the recessed parts 1a and 1b through a link changing means consisting of a pressing lever 9, a tensile spring 11 and solenoid 12 to enable change of an integrated rotation/a relative rotation of the driving shaft 1 and the eccentric wheel 2. The driving shaft 1 is decelerated from an ordinary revolving speed to a low speed or zero through a servo motor 5 capable of controlling speed change by a control computer Co while the change operation to secure engagement and disengagement of the tool stoppers 6 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shedding method and device for a loom.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 59-30930 and Japanese Unexamined Patent Publication No. 59-30931 disclose a coupling position in which an eccentric wheel, which is relatively rotatably fitted to a drive shaft, and a drive shaft integrally rotate. The locking member is switched between the (engagement recess engaged position) and the coupling release position (position disengaged from the engagement recess) where the drive shaft rotates relative to the eccentric wheel, and the heddle frame is moved up and down. There is disclosed an opening device in which a connecting wheel fitted to the eccentric wheel so as to be relatively rotatable is connected to a driving force transmission system for moving. When the heddle frame is held in the upper opening or the lower opening, the locking member is arranged at the uncoupling position. When the heddle frame is moved up and down, the locking member is arranged at the connecting position. When the locking member is arranged at the connecting position, the eccentric wheel rotates integrally with the rotary shaft, and the connecting wheel pivots about the drive shaft. Due to this turning motion, the heddle frame moves up and down. When the locking member is arranged at the uncoupling position, the eccentric wheel does not rotate integrally with the rotary shaft, and the heddle frame is held at the upper opening or lower opening position. According to this opening device, the number of repeats (one cycle of the fabric structure) can be arbitrarily set like the dobby opening device, and the fabric having a complicated structure can be woven. Moreover, the mechanism is not as large as the dobby opening device.

[0003]

The drive shaft is driven by the crankshaft of the loom, which is rotated once for every two rotations of the crankshaft. It has gained. That is, the drive shaft makes a half rotation for one rotation of the loom, and the rotation direction thereof alternates. Therefore, the rotation speed of the drive shaft becomes zero when the rotation speed of the drive shaft is alternately reversed, and when the locking member has the rotation speed of zero of the drive shaft, it is switched between the coupling position and the coupling release position. However, the state where the rotation speed of the drive shaft is zero is momentary, and there is no guarantee that the locking member will surely enter the engaging recess or be disengaged from the engaging recess. The desired opening pattern cannot be obtained unless the drive shaft and the eccentric wheel are securely connected and disconnected.

It is an object of the present invention to accurately carry out a desired opening pattern in an opening device for connecting and disconnecting a drive shaft and an eccentric wheel.

[0005]

To this end, the present invention engages an engaging recess on a drive shaft so as to integrally rotate an eccentric wheel and a drive shaft, which are rotatably fitted to the drive shaft. And a coupling switching means for switching the locking body between the coupling position and the coupling releasing position where the drive shaft is disengaged from the engagement recess so as to rotate the drive shaft relative to the eccentric wheel, and the heddle frame is moved up and down. The present invention is directed to an opening device in a loom in which a connecting wheel that is relatively rotatably fitted to the eccentric wheel is connected to a drive force transmission system for moving the lock body to the uncoupling position. When the switching position is changed to the coupling position, the rotation speed of the drive shaft is decelerated from the normal rotation speed between before and after the switching position to be a low speed or zero.

According to a second aspect of the present invention, there is provided an opening device including a speed change drive motor for supplying a driving force to the drive shaft and a speed change control means for controlling a rotation speed of the speed change drive motor.

According to the third aspect of the present invention, the pair of engaging concave portions formed at rotationally symmetrical positions of half rotation on the peripheral surface of the drive shaft and the major radius portion of the eccentric ring are slidably supported in the radial direction. The first lock body, the second lock body slidably supported by the short radius portion of the eccentric ring in the radial direction, and the first lock body facing one of the pair of engagement recesses. The coupling switching means is constituted by an engagement switching mechanism that engages one of the locking body and the second locking body with the opposing engagement recess.

According to a fourth aspect of the present invention, a rotor is attached to the lock body, an arc-shaped guide is provided on the connecting ring, and the lock body is engaged with either one of the pair of engaging recesses. The rotor on the body rolls on the guide as the drive shaft rotates.

[0009]

When the lock body is arranged to be switched between the disengagement position and the connection position, the rotational speed of the drive shaft is reduced from the normal rotational speed to a low speed or zero before and after the switching arrangement. Thus, the rotation speed of the variable speed drive motor is controlled. When the rotational speed of the drive shaft is low or zero, the lock body is inserted into or disengaged from the engaging recess. There is a margin in the period when the rotation speed of the drive shaft is low or zero, so that the lock body can be reliably inserted into and removed from the engagement recess.

According to the second aspect of the invention, the period during which the heddle frame is stationary in the upper opening and the lower opening (so-called warp stationary angle) can be changed.
According to the third aspect of the invention, the engagement recess on the drive shaft that makes a half rotation for one rotation of the loom is located at the lock disposition position of the lock body, which is switched between the coupling position and the disengagement position by the engagement switching mechanism. Each time the loom is rotated, it is alternately replaced. First of the long radius
When the locking body of the above is engaged with the engaging recess, the heald frame performs either one of upward movement and downward movement, and then the second portion of the short radius portion.
When the locking body of (1) engages with the engaging recess, the heald frame performs the other operation. The adoption of the pair of locking members simplifies the engagement switching mechanism.

According to the invention of claim 4, when the drive shaft and the eccentric wheel are integrally rotated, the rotor on the locking body rolls on the arc-shaped guide, and the eccentric wheel and the coupling wheel are connected. The relative rotation between them is smoothly performed. Smooth relative rotation between the eccentric wheel and the connecting wheel is necessary for the accurate performance of the desired opening pattern.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. Reference numeral 1 denotes a drive shaft, and an eccentric wheel 2 is supported on the drive shaft 1 so as to be relatively rotatable. A pair of engaging recesses 1a and 1b are formed on the peripheral surface of the drive shaft 1 at rotationally symmetrical positions of half rotation. That is, the engaging recesses 1a, 1
b is located on the diameter line of the drive shaft 1. Engagement recess 1
Apertures 1a ₁ and 1b ₁ of a and 1b have an expanded shape, and compression springs 3 and 4 are housed in the engagement recesses 1a and 1b. The lengths of the compression springs 3 and 4 are the engaging recesses 1a and 1b.
Is less than or equal to the depth, and one end of the compression springs 3 and 4 does not protrude from the peripheral surface of the drive shaft 1. The drive shaft 1 is rotationally driven in one direction by a servo motor 5 which is different from a loom drive motor (not shown).

Housing grooves 2a, 2b are formed on the long radius side and the short radius side of the eccentric ring 2. Storage grooves 2a, 2b
Is located on the diameter line of the eccentric ring 2, and each accommodation groove 2a,
Locking bodies 6 and 7 are slidably accommodated in 2b. Rotors 6a, 7a are attached to the ends of the lock bodies 6, 7 on the outer peripheral side of the eccentric wheel 2. When the lock bodies 6 and 7 are not in the engagement recesses 1a and 1b, the rotor 6
The a and 7a project from the receiving grooves 2a and 2b in the radial direction, that is, from the outer circumference of the eccentric ring 2. The end portions of the lock bodies 6, 7 on the inner peripheral side of the eccentric wheel 2 have openings 1a ₁ of the engaging recesses 1a, 1b,
It is shaped to fit snugly into the expanded shape of 1b ₁ .

As shown in FIG. 3, the lock members 6 and 7 can enter the engaging recesses 1a and 1b. When the locking bodies 6 and 7 are not inserted into the engaging recesses 1a and 1b, the housing grooves 2a and 2b oppose the engaging recesses 1a and 1b once per one rotation of the drive shaft 1 through the half rotation. . When the lock bodies 6, 7 are in the engagement recesses 1a, 1b, the spring force of the compression springs 3, 4 acts on the lock bodies 6, 7, and the lock bodies 6, 7
Is subjected to a spring action in a direction in which it disengages from the inside of the engaging recesses 1a and 1b.

A connecting wheel 8 is fitted and supported on the eccentric wheel 2 so as to be relatively rotatable. A guide 8a is integrally formed on the inner peripheral edge of the connecting wheel 8. The guide 8a is an arc that reaches approximately half of the inner circumference of the connecting wheel 8. A guide inclined surface 8a ₁ is formed at one end of the guide 8a so as to be continuous with the inner circumferential circle of the connecting wheel 8.

A push-in lever 9 is attached to the connecting wheel 8 by a spindle 10.
It is rotatably supported via. Push lever 9
Is urged clockwise by a tension spring 11 in FIG. An electromagnetic solenoid 12 is attached to the connecting wheel 8. Push lever 9 is tension spring 1
The spring action of 1 makes contact with the drive rod 12 a of the electromagnetic solenoid 12. In FIG. 2, the electromagnetic solenoid 12 is in the demagnetized state, and in FIG. 3, the electromagnetic solenoid 12 is in the excited state. In the state of FIG. 2, the tip of the pushing lever 9 is separated from the peripheral edge of the eccentric wheel 2, and in the state of FIG. 3, the tip of the pushing lever 9 is very close to the peripheral edge of the eccentric wheel 2.

A swing lever 13 is connected to the connecting wheel 8. Swing lever 13 centered on shaft 13a
The swinging of the connector 14, connecting link 15, trade lever 16, connecting link 17, connecting lever 1
The vertical movement of the heald frame 23 is converted via the driving force transmission system including the pair of angle levers 19 and 20 and the pair of connecting rods 21 and 22. The vertical movement of the heddle frame 13 is guided by the guide members 24 and 25.

The servomotor 5, which is a variable speed drive motor, is controlled by the control computer C ₀ . The control computer C ₀ controls the servo motor 5 based on the rotation angle detection information from the rotary encoder 26 for detecting the rotation angle of the loom.
Control the rotation speed of. Further, the control computer C _{0 serving as} a shift control means for controlling the rotation speed of the servomotor 5 controls the excitation / demagnetization of the electromagnetic solenoid 12 based on the opening pattern program representing the fabric structure.

A curve D in the graph of FIG. 5 represents a change in the rotation speed of the servomotor 5. The horizontal axis θ represents the rotation angle of the loom, and the vertical axis represents the rotation speed. The rotation speed V is a normal rotation speed. A curve E ₁ represents a change in vertical movement of the heddle frame 23, and a curve E ₂ represents a change in vertical movement of a heddle frame different from the heddle frame 13. The servomotor 5 has a rotation speed of zero for each rotation of the loom, and the state of the rotation speed of zero covers a constant loom rotation angle range [θ ₁ , θ ₂ ]. That is, the servo motor 5 is decelerated from the previous rotation angle theta ₁ from the normal rotation speed V, it becomes the rotational speed zero at the rotation angle theta _1. When the rotation angle θ reaches θ ₂ , the servomotor 5 speeds up and shifts to the normal rotation speed V.

The rotation angle θ of the loom is in the rotation angle range [θ ₁ ,
[theta ₂ ]], the servo motor 5 is rotating.
The drive shaft 1 and the eccentric wheel 2 are in the positional relationship shown in FIG. 1 when the servo motor 5 is rotating, and the lock body 7 is arranged at the coupling position where it engages with the engagement recess 1a, and It is assumed that the lock body 6 is disposed at the coupling release position where it is separated from the engagement recess 1b. In this state, the heald frame 13 is moving to the lower opening position. When the rotation angle θ of the loom becomes θ ₁ , the rotation speed of the servomotor 5 becomes zero. When the rotation speed of the servomotor 5 is zero, the engagement recesses 1a and 1b face the housing grooves 2a and 2b as shown in FIG. Heddle frame 1
If the opening pattern of 3 shifts from the lower opening position to the upper opening position as shown by the curve E ₁ , the control computer C
_{At 0} , the electromagnetic solenoid 12 is excited under the condition that the rotation speed of the servomotor 5 is zero. When the electromagnetic solenoid 12 is excited, the push-in lever 9 rotates from the position shown in FIG. 2 to the position shown in FIG. 3 against the spring action of the tension spring 11. By this rotation, the tip of the push-in lever 9 comes very close to the outer periphery of the eccentric wheel 2 and comes into contact with the rotor 6a of the lock body 6. The push-in lever 9 contacts the rotor 6a while engaging the lock body 6 with the recessed portion 1a.
Push it to the side. Due to this pushing action, the lock body 6 is arranged at the coupling position where it fits into the opening 1a ₁ of the engaging recess 1a, and the rotor 6a substantially enters inside the inner circumference of the connecting wheel 8. The operation of shifting the locking body 6 from the uncoupling position where it is not fitted to the opening 1a ₁ to the fitted coupling position is performed while the rotation speed of the servomotor 5 is zero.

The lock body 6 is the opening 1a of the engaging recess 1a.₁To
After mating, the rotation angle θ of the loom is θ ₂When it comes to control
Pewter C₀Causes the servomotor 5 to rotate. Lock body 6
Eccentric wheel 2 is driven because
Follow the rotation of shaft 1. The rotor 6a is the inner circle of the connecting ring 8.
The eccentric wheel 2 is located inside the
When following the rolling, the rotor 6a rolls on the inner peripheral surface of the guide 8a.
To do. Therefore, the drive shaft 1 and the eccentric wheel 2 are integrally rotated smoothly.
Roll over. When the loom rotates once from the state shown in FIG. 2, the lock body 6,
7 revolves around the drive shaft 1 by 180 °, and the rotor 6a
Comes out of the guide 8a. Then, the lock body 6 becomes the compression spring 3
Of the engaging recess 1a by the spring action of
The lock body 6 moves from the connecting position where it is fitted into the engagement recess 1a.
It shifts to the uncoupling position separated from the coupling recess 1a. This
The rotor 6a projects from the outer periphery of the eccentric ring 2 due to the shift of
It Further, the rotor 7a is in a state of protruding from the outer periphery of the eccentric wheel 2.
The guide inclined surface 8a of the guide 8a₁Touch. That is, drive
The shaft 1 and the eccentric ring 2 are integrally rotated half a turn to lock the body.
6 and 7 exchange their positions from the state of FIG. Drive
Control computer C while shaft 1 rotates half a turn₀Is electromagnetic
De-energize the noid 12, and push lever 9 pulls the spring.
The spring action of 11 restores the state of FIG. 3 to the state of FIG.
Go home.

The driving wheel 1 and the eccentric wheel 2 are integrally rotated halfway to move the connecting wheel 8 to the right from the position shown in FIG. The rightward movement of the connecting wheel 8 is converted into upward movement of the heddle frame 23 through the swing lever 13, the trade lever 16, and the angle levers 19 and 20, respectively, and the heddle frame 13 moves upward from the lower opening position. Move to the open position.

When the next opening pattern of the heald frame 13 shifts from the upper opening to the lower opening, the electromagnetic solenoid 12 is excited in the same manner as described above, and the locking body 7 is disengaged from the engaging recess 1b. To the engaging position where the engaging recess 1b is fitted. With this arrangement, as shown in FIG. 4, the drive shaft 1 and the eccentric wheel 2 integrally rotate half a while the rotor 7a rolls on the inner circumference of the guide 8a. The half rotation of the eccentric wheel 2 causes the connecting wheel 8 to move leftward from the position shown in FIG. 4, and the heald frame 13
Shifts from the upper opening to the lower opening. Then, while the heald frame 13 is moving, that is, while the drive shaft 1 is half rotating, the electromagnetic solenoid 1
2 is demagnetized.

The next opening pattern of the heddle frame 13 is changed.
If not, control computer C ₀Is an electromagnetic solenoid
12 is kept in a demagnetized state. Therefore, the locks 6 and 7
The eccentric wheel 2 is driven as it is held in the uncoupling position.
It does not make a half rotation with the shaft 1. Therefore, the connecting wheel
8 does not move due to half rotation of the drive shaft 1,
The heald frame 13 does not move up and down.

When the locking bodies 6, 7 are arranged to be switched between the disengaged position and the combined position, the rotational speed of the drive shaft 1 is before and after the switching arrangement, that is, the loom rotation angle [θ ₁ , θ ₂ ]. The control computer C ₀ controls the rotation speed of the servomotor 5 which is the variable speed drive motor so that it becomes zero in the range. Therefore, when the rotational speed of the drive shaft 1 is zero, the lock bodies 6 and 7 are fitted in the engagement recesses 1a and 1b or the engagement recesses 1a and 1b.
Leave from 1b. The period in which the rotation speed of the drive shaft 1 is zero, that is, the range of the loom rotation angle [θ ₁ , θ ₂ ] has a margin that is not instantaneous. Therefore, the engaging recess 1 of the lock body 6, 7
At the time of fitting with respect to a and 1b, the engaging recesses 1a and 1b and the locking bodies 6 and 7 accurately face each other, and the locking bodies 6 and 7 are fitted securely into the engaging recesses 1a and 1b. Further, when the lock bodies 6, 7 are disengaged from the engagement recesses 1a, 1b, the rotational driving force of the drive shaft 1 does not act on the lock bodies 6, 7. Therefore, the lock members 6 and 7 that enter both the accommodation grooves 2a and 2b and the fitting recesses 1a and 1b are not sandwiched between the drive shaft 1 and the eccentric ring 2, and the lock members are not locked. 6, 7 are engaging recesses 1
Be sure to separate from a and 1b. The lock bodies 6 and 7 are surely fitted into the engagement recesses 1a and 1b and are reliably disengaged from the engagement recesses 1a and 1b, so that the drive shaft 1 and the eccentric wheel 2 are integrally rotated halfway and the drive shaft 1 is rotated. Only one half rotation is reliably performed according to the opening pattern. As a result, the vertical movement of the heddle frame reliably follows the opening pattern.

In this embodiment, the lock members 6 and 7 are arranged to be switched between the coupling position and the coupling releasing position, and this switching position is the push-in portion which constitutes the engagement switching mechanism together with the electromagnetic solenoid 12 and the tension spring 11. It is a specific position on the movement locus of the tip of the lever 9. The engaging recesses 1a and 1b on the drive shaft 1 which makes a half rotation with respect to one rotation of the loom are alternately switched at every switching of the loom at the switching arrangement positions of the lock members 6 and 7. When the first locking body 6 of the long radius portion engages with the engagement recesses 1a and 1b, the heald frame 13 moves upward, and then the second locking body 7 of the short radius portion engages with the engagement recesses 1a, 1b. When it is engaged with 1b, the heald frame 13 moves downward. Conventionally, there is only one locking body, and therefore two pushing levers (referred to as pressing levers in JP-A-59-30930 and JP-A-59-30931) are required. However, in the present embodiment, the use of the pair of locking members 6 and 7 requires only one push-in lever 9, and the engagement switching mechanism is simplified.

If there is a large rotational resistance between the eccentric wheel 2 and the connecting wheel 8, the connecting wheel 8 is dragged by the rotation of the eccentric wheel 2, and the timing of opening and closing the heddle frame 13 becomes inaccurate. Heddle frame 1
If the opening / closing timing of No. 3 is incorrect, weft insertion failure is likely to occur. That is, smooth relative rotation between the eccentric wheel 2 and the connecting wheel 8 is necessary for the accurate execution of the desired opening pattern. In this embodiment, when the drive shaft 1 and the eccentric wheel 2 are integrally rotating, the rotors 6a, 7 on the lock members 6, 7 are rotated.
a rolls on the arc-shaped guide 8a. Therefore, the relative rotation between the eccentric wheel 2 and the coupling wheel 8 is smoothly performed, and accurate execution of a desired opening pattern is guaranteed.

The period in which the rotation speed of the servo motor 5 is zero is set as an instant, or the minimum rotation speed of the servo motor 5 is set to a low non-zero speed, and the locking members 6, 7 are provided between the coupling position and the coupling releasing position. Can also be switched. Since the engaging recesses 1a and 1b have an expanded shape, and the ends of the lock bodies 6 and 7 that engage with the engaging recesses 1a and 1b also have a tapered shape,
If the engaging recesses 1a, 1b are moving around at a low speed, it is easy to engage and disengage the lock bodies 6, 7 with the engaging recesses 1a, 1b.

Next, the embodiment shown in FIGS. 7 and 8 will be described.
In this embodiment, an arc-shaped guide 27 is rotatably supported on the connecting wheel 8 via a support shaft 28. Guide 27
The inner peripheral surface of is the same shape as the semicircular arc of the inner peripheral circle of the connecting ring 8.
The guide 27 is in contact with the drive rod 12a of the electromagnetic solenoid 12A by the spring action of the tension spring 11A. The other structure is the same as that of the first embodiment. As shown in FIG. 7, when the electromagnetic solenoid 12A is in the demagnetized state, the guide 27 is separated from the inner circumferential circle of the connecting wheel 8. As shown in FIG. 8, when the electromagnetic solenoid 12A is in the excited state, the inner peripheral surface of the guide 27 is located on the inner peripheral circle of the connecting wheel 8.
Excitation of the electromagnetic solenoid 12A is started within a period in which the drive shaft 1 does not rotate and is demagnetized immediately before the half rotation of the drive shaft 1 is completed.

When the inner peripheral surface of the guide 27 is arranged on the inner peripheral circle of the connecting ring 8 from the state of FIG. 7, the tip of the guide 27 abuts the rotor 6a to engage the locking body 6 with the concave portion. It can be pushed into 1a. By this pushing in, the lock body 6 is switched from the coupling release position to the coupling position. When the drive shaft 1 makes a half rotation, the rotor 6a rolls on the inner peripheral surface of the guide 27 and then comes off the base end of the guide 27, and the lock body 6 moves from the coupling position to the coupling release position by the spring action of the compression spring 3. Will be placed.
The electromagnetic solenoid 12A is demagnetized, and the guide 27
Are separated from the inner circumference circle of the connecting wheel 8. Therefore, when the drive shaft 9 has completed half a rotation, the rotor 7a of the lock 7 is guided by the guide 2
It does not come into contact with the tip portion of 7.

In this embodiment, the guide 27 for providing smooth relative rotation between the eccentric wheel 2 and the connecting wheel 8 also serves as a push-in lever, and a mechanism for guiding the rotors 6a, 7a and an engagement switching mechanism. The combination switching means can be simplified.

Next, the embodiment shown in FIGS. 9 and 10 will be described. In this embodiment, the arc-shaped guide 27 is used as the support shaft 2.
8 is rotatably supported on the connecting wheel 8 via the guide wheel 8, and an arcuate guide 29 is provided on the connecting wheel 8 via the support shaft 30.
It is rotatably supported above. The guides 27 and 29 have the same shape and the same size, and are arranged at rotationally symmetrical positions of half rotation. The inner peripheral surfaces of the guides 27 and 29 have the same shape as the semicircular arc of the inner peripheral circle of the connecting ring 8. The guides 27 and 28 are connected to the electromagnetic solenoid 12 by the spring action of the tension springs 11A and 11B.
It is in contact with the drive rods 12a of A and 12B. Further, in this embodiment, there is only one lock body 6 and one engagement recess 1a, and the lock release body 6 is separated from the engagement recess 1a in the disengaged position and the engagement recess 1a is engaged in the combined position. Is switched to. The other structure is the same as that of the first embodiment.

As shown in FIG. 9, the electromagnetic solenoid 12A,
When 12B is in the demagnetized state, the guides 27 and 29 are separated from the inner circumferential circle of the connecting wheel 8. As shown in FIG. 10, when the electromagnetic solenoids 12A and 12B are in the excited state, the inner peripheral surfaces of the guides 27 and 29 are located on the inner peripheral circle of the connecting wheel 8.
Excitation of the electromagnetic solenoids 12A and 12B is started within a period in which the drive shaft 1 does not rotate, and demagnetized immediately before the half rotation of the drive shaft 1 is completed.

When the inner peripheral surface of the guide 27 is arranged on the inner peripheral circle of the connecting ring 8 from the state of FIG. 9, the tip of the guide 27 abuts the rotor 6a to engage the locking body 6 with the concave portion. It can be pushed into 1a. By this pushing in, the lock body 6 is switched from the coupling release position to the coupling position. When the drive shaft 1 makes a half rotation, the rotor 6a rolls on the inner peripheral surface of the guide 27 and then comes off the base end of the guide 27, and the lock body 6 moves from the coupling position to the coupling release position by the spring action of the compression spring 3. Will be placed.

Also in this embodiment, the eccentric wheel 2 and the connecting wheel 8
A guide 27 for providing a smooth relative rotation between
29 also functions as a pushing lever. Further, according to the opening device using the variable speed drive motor of the present invention, the angular velocity pattern of the drive shaft 1 can be changed quite freely. Therefore, the degree of freedom in changing the period during which the heddle frame is held at the lower opening position or the upper opening position (so-called warp static angle) becomes extremely high, and good warp insertion and setting of the warp static angle in consideration of the texture of the woven fabric are performed. Will be easier.

[0036]

As described above in detail, according to the present invention, when the lock body is arranged to be switched between the coupling releasing position and the coupling position, the rotation speed of the drive shaft is normally rotated before and after the switching arrangement. Since the speed is reduced to a low speed or zero, the lock body is reliably inserted into and removed from the engagement recess, and the drive shaft and the eccentric wheel are securely connected and disconnected. To achieve exactly the desired opening pattern.

According to the second aspect of the present invention, since the rotation speed of the shift drive motor is controlled by the shift control means, the warp yarn standstill angle can be easily changed. In the invention of claim 3, an engagement switching mechanism that engages either one of the first locking body and the second locking body facing the one of the pair of engaging recesses with the facing engaging recess. Since the coupling switching means is constituted by, the engagement of both locking bodies with respect to the engagement recess can be performed by a single engagement switching mechanism, and the engagement switching mechanism is simplified.

According to the fourth aspect of the invention, the rotor on the lock body rolls on the guide as the drive shaft rotates, so that the relative rotation between the eccentric wheel and the connecting wheel is smooth. Done,
Accurate performance of the desired opening pattern is guaranteed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment embodying the present invention.

FIG. 2 is an enlarged front view of a partially broken essential portion showing a demagnetized state of an electromagnetic solenoid.

FIG. 3 is an enlarged front view of a partially broken essential portion showing an electromagnetic solenoid excited state.

FIG. 4 is an enlarged front view of a partially broken essential portion showing an electromagnetic solenoid excited state.

FIG. 5 is a graph showing a rotation speed and an opening pattern of a servo motor.

FIG. 6 is an exploded perspective view of a main part.

FIG. 7 is an enlarged front view of a partially broken essential part showing a demagnetized state of an electromagnetic solenoid of another example.

FIG. 8 is an enlarged front view of a partially broken essential part showing an electromagnetic solenoid excited state.

FIG. 9 is an enlarged front view of a partially broken essential portion showing a demagnetized state of an electromagnetic solenoid of another example.

FIG. 10 is an enlarged front view of a partly broken main part showing a state where an electromagnetic solenoid is excited.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 1a, 1b ... Engagement recessed part which comprises a coupling switching means, 2 ... Eccentric wheel, 2a, 2b ... An accommodation groove, 5 ... Servo motor used as a variable-speed drive motor, 6 ... 1 lock body, 7 ... 2nd lock body which comprises a coupling switching means, 6a, 7a ... Rotor, 8 ... Connecting wheel, 8a ... Guide, 9 ... Pushing lever which comprises an engagement switching mechanism, 1
1, 11A, 11B ... tension springs constituting an engagement switching mechanism, 12, 12A, 12B ... electromagnetic solenoids constituting an engagement switching mechanism, 27, 29 ... Guides, C ₀ ... Control motors serving as shift control means.

Claims (4)

[Claims] 1. A coupling position for engaging an engagement recess on a drive shaft so as to integrally rotate an eccentric wheel fitted to a drive shaft so as to rotate relative to the drive shaft, and the drive shaft being eccentric. A coupling switching means for switching and arranging the locking body to a coupling releasing position separated from the engagement concave portion so as to rotate relative to the wheel is provided, and the driving force transmission system for vertically moving the heddle frame is provided with the coupling switching means. In a shedding device in a loom in which a connecting wheel fitted to an eccentric wheel so as to be rotatable relative to each other is connected, when the lock body is arranged to be switched between a coupling release position and a coupling position, the rotation speed of the drive shaft is set to the above-mentioned value. A shedding method in a loom in which the normal rotation speed is reduced before and after the switching arrangement to reduce the speed to zero. 2. An eccentricity of the drive shaft and a coupling position for engaging an engagement recess on the drive shaft so as to integrally rotate the eccentric wheel fitted to the drive shaft so as to be rotatable relative to the drive shaft. A coupling switching means for switching and arranging the locking body to a coupling releasing position separated from the engagement concave portion so as to rotate relative to the wheel is provided, and the driving force transmission system for vertically moving the heddle frame is provided with the coupling switching means. In a shedding device in a loom, in which a connecting wheel fitted to an eccentric wheel so as to be rotatable relative to each other is connected, a shift drive motor for supplying a driving force to the drive shaft, and a shift control means for controlling a rotation speed of the shift drive motor. A shedding device in a loom equipped with. 3. A pair of engaging recesses formed at rotationally symmetrical positions of half rotation on the peripheral surface of the drive shaft, and a first lock supported by the major radius portion of the eccentric ring so as to be slidable in the radial direction. A body, a second locking body slidably supported in a short radius portion of the eccentric ring in a radial direction, and the first locking body facing one of the pair of engaging recesses.
3. The shedding device for a loom according to claim 2, wherein a coupling switching means is configured by an engagement switching mechanism that engages one of the locking body and the second locking body of the locking body with the engaging recess. 4. A rotor on the lock body, wherein a rotor is attached to the lock body, an arc-shaped guide is provided on the connecting ring, and the lock body is engaged with either one of the pair of engaging recesses. The shedding device in the loom according to any one of claims 2 and 3, wherein the roller rolls on the guide as the drive shaft rotates.