JPH101842A - Rotary dobby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary dobby for a weaving machine that enables selection of whether to maintain a heald frame in opening condition or not, by a simple mechanism. SOLUTION: This rotary dobby comprises a driving shaft 14 that revolves by a half turn every turn of a loom, eccentric ring 15 supported relatively rotatably around the shaft 14, a connecting ring 16 supported relatively rotatably around the eccentric ring 15, a hook 21 provided for the eccentric shaft 15 so as to fit to or to be detached from concavities 18a, 18b in the circumferential surface positions of the driving shaft 14 corresponding to half turns of the driving shaft, and a pair of operating members 31, 32 in such a way that either one of them advances to working position fit to the hook 21 and the other retreats from the working position fit to the hook 21 on the opposite side of the circumference of the same shaft section in the stop of the shaft after every half turn. The operating members 31, 32 in a pair are respectively supported swingably around their respective middle position so that one end of each is formed to act on the hook and the other end is connected to an air cylinder 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary dobby for a loom.

[0002]

2. Description of the Related Art Conventionally, a rotary dobby shown in FIG. 3 is known. The opening device includes the following three basic members: a drive shaft 41, an eccentric wheel 42 rotatably supported by the drive shaft 41, and a swinging rod (not shown) for vertically moving the heald frame. Hole 4 with one end rotatably mounted
3a and a connecting wheel 43 rotatably supported by an eccentric wheel 42.

[0003] Engaging portions 41a and 41b are formed on opposing peripheral surfaces of the drive shaft 41. A braking lever 44 is swingably supported on the eccentric wheel 42 by a shaft 45, and a locking body 46 is housed slidably in the axial direction with the locking body 46 engaged with one end of the braking lever 44. A pressing spring 47 that engages with the other end of the lever 44 is provided. Connecting wheel 4
3, coupling piston mechanisms 50 and 51 in which the piston pushes the brake lever 44 by the excitation of the electromagnetic three-way valve 48, and the piston
The piston mechanisms 52 and 53 for uncoupling which are pressed are mounted.

[0004] The drive shaft 41 is driven by a servomotor different from the drive motor of the loom. Each time the loom rotates once, it accelerates, decelerates, and stops for a short time to make a half turn. FIG. 3 shows a state in which the drive shaft 41 is stopped, that is, in a state where the heald frame is in an open state in which the heald frame is moved up or down. Accordingly, the drive shaft 41 is shifted from the state shown in FIG.
° Stop for a short time when rotated. Selection of whether the locking body 46 is to be engaged with the engaging portion 41a, that is,
2 is rotated together with the drive shaft 41, the connecting wheel 43 is moved to the right or left and the heald frame is raised or lowered toward the next opening. Done. That is, when the locking body 46 is to be engaged with the engagement portion 41a shortly before the drive shaft 41 enters the stop state, the electromagnetic three-way valve 48 is excited and the electromagnetic three-way valve 49 is excited.
Is demagnetized to release the engagement, the electromagnetic three-way valve 49 is excited and the electromagnetic three-way valve 48 is demagnetized.

[0005]

The above-mentioned rotary dobby has a locking body 46 for selecting whether to keep the heald frame open or to raise or lower the heald frame toward the next open state.
Is moved by the coupling piston mechanism 50 or the coupling piston mechanism 51 operated by excitation of the electromagnetic three-way valve 48, the coupling release piston mechanism 52 or the coupling release piston mechanism 53 activated by the excitation of the electromagnetic three-way valve 49. Therefore, the control mechanism is very complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary dobby for a loom in which a simple mechanism can select whether to maintain an open state of a heald frame.

[0007]

A rotary dobby according to the present invention comprises a drive shaft 14 which makes a half turn for each rotation of a loom, an eccentric wheel 15 which is supported so as to be relatively rotatable around the drive shaft, and a relative rotation about which is provided. And a hook 21 provided on the eccentric wheel 14 which engages or disengages with the concave portions 18a, 18b of the drive shaft peripheral surface corresponding to the stop every half rotation.
One of the hooks 21 at each stop for each half rotation.
And a pair of operating members 31 and 32, which move forward to a position for acting on the hook and move back on the opposite side from a position for acting on the hook.

A pair of operating members 31 and 32 are swingably supported at an intermediate portion, respectively, and have one end acting as a hook acting portion and the other end connected to an air cylinder 33.

When the drive shaft 14 is stopped every half rotation,
It is preferable to provide rotation preventing members 24, 25, 26 for making the 6 non-rotating with respect to the eccentric 15.

[0010]

1 and 2, an embodiment of a rotary dobby according to the present invention will be described.

The rotary dobby is provided for each heald frame of a loom in which up to about 30 heald frames 1 are juxtaposed in the depth direction of FIG. It governs.

Each heald frame 1 is slidably supported by guide members 2 and 3 of the loom frame. On both lower sides of each heald frame 1, one ends of connecting rods 4 and 5 are swingably attached.

The bent portions of the L-shaped rods 6 and 7 are swingably supported by support shafts 8 and 9 on the machine frame of the loom. The other ends of the connecting rods 4 and 5 are swingably attached to the ends of one arm of each of the L-shaped rods 6 and 7. The length of the other arm of the L-shaped rod 6 is twice as long as the other arm of the L-shaped rod 7.
A connecting rod 10 is swingably mounted between the middle part of the other arm of the L-shaped rod and the end of the other arm of the L-shaped rod 7. One end of a connecting rod 11 is swingably attached to an end of the other arm of the L-shaped rod 6.

A lower end portion of a swinging rod 12 is swingably supported by a support shaft 13 on the loom frame. The connecting rod 1
The other end of 1 is swingably attached to the upper end of the swinging rod 12.

The rotary dobby according to the present invention comprises
2, which is driven by a servomotor different from the drive motor of the loom, and performs a half-turn by increasing, decelerating, and stopping for a short time every time the loom rotates once. A drive shaft 14, an eccentric ring 15 rotatably supported around the drive shaft 14, and a relative rotatable support around the eccentric ring 15, and the projection 16 a Connecting ring 16 swingably attached to the intermediate portion of
And an engagement selection mechanism 17 for selecting an engagement relationship between the drive shaft 14 and the eccentric wheel 15 every time the drive shaft 14 makes a half turn.

The outer periphery of the drive shaft 14 is constituted by a tube 18 having engagement recesses 18a, 18b at opposing positions, and is integrated with the main body by a key 19.

On the side of the eccentric ring 15, hooks 21
Is pivotally supported by a support shaft 22. One end of the hook 21 is an engaging portion 21a that engages with the engaging recesses 18a, 18b of the drive shaft 14. The hook 21 is hooked by a compression spring 23 provided on the side surface of the eccentric wheel 15 so that the engaging portion 21a is directed toward the center. This urging is performed by a guide member 29 that guides the other end of the hook 21, that is, the operation end 21 b.
Is regulated to a certain extent. Also, the eccentric ring 15
Each of the pins 2
4 and 25 are provided integrally.

An anti-rotation body 26 is swingably supported by a support shaft 27 on the upper side surface of the connecting wheel 16. At the outer edge of the anti-rotation body 26 on the eccentric wheel 15 side, a concave portion 26a that engages with the pin 24 or the pin 25 is formed.
Biased towards the center. This bias is
The hole 26b of the rotation preventing body 26 and the spring support 30 of the compression spring 28
Is regulated to a certain extent. This rotation prevention body 2
6 is the pin 2 when the drive shaft 14 is stopped for a short time every half rotation.
This is for stabilizing the eccentric wheel 15 by engaging with the pin 4 or the pin 25.

The engagement selecting mechanism 17 includes the above-mentioned members, namely, the hook 21 for engaging and disengaging, the compression spring 23, the pin 24, the pin 25, the rotation preventing body 26 and the compression spring 28, and the middle portion of the loom frame. Each of the rods of the air cylinder 33, which is swingably supported on the support shafts 34 and 35, one end of which acts on the operating end 21b of the hook 21 for hooking and unhooking, and the other end of which is fixed to the machine frame of the loom. It is constituted by a pair of operating rods 31 and 32 connected to 33a and 33b, respectively. The air cylinder 33 used here is not a large one that takes up space unlike the conventional three-way solenoid valve or piston mechanism, so that it is convenient to provide each heald frame 1 in a narrow space.

FIG. 1 shows a state in which the drive shaft 14 is stopped, a valve (not shown) of the air cylinder 33 is turned on, the rod 33a is extended, and the rod 33b is retracted. This is when the heald frame 1 is at the highest position and is in the open state. Therefore, the drive shaft 14
Stops for a short time even when rotated by 180 ° from the state shown in FIG.

In this state, if the air cylinder 33 remains on, the state in which the engaging portion 21a of the hook 21 is engaged with the engaging concave portion 18a of the drive shaft 14 continues. The eccentric wheel 15 also makes a half turn with the half turn of.
If the air cylinder 33 is still on at the end of the half rotation of the eccentric wheel 15, the lower end of the operating rod 31 leaning to the right is guided by the edge of the rotating guide member 29 and engages with the recess. Combine. When the valve of the air cylinder 33 is turned off in the state shown in FIG. 1, the rod 33a retracts and the rod 33b extends. Therefore, the lower ends of the operating rods 31 and 32 (the portion of the hook 21 for operating the operating end 21b) move to the left. At this time, the operated end portion 21b of the hook 21 is pushed to the left by the operating rod 32, and the engaging portion 21a is disengaged from the engaging concave portion 18a.

Such an engaging portion 2 of the hook 21
Selection of whether or not 1a is engaged with the engaging concave portion 18a of the drive shaft 14, that is, the eccentric wheel 15 is rotated together with the drive shaft 14, the connecting wheel 16 is moved to the right or left, and the heald frame 1 is moved to the next opening. The choice of whether to raise or lower is made shortly before the drive shaft 14 enters the stop state.

[0023]

Since the present invention is configured as described above, it has the following effects.

That is, it is possible to select whether or not to maintain the open state of the heald frame by a space-saving compact and simple mechanism at high speed and reliably. If the power source for the selection is an air cylinder, the pattern data can be read at high speed ahead of time by its damper function. Further, in the case where a rotation preventing member for setting the connecting wheel in a non-rotating state with respect to the eccentric wheel at the time of stopping every half rotation of the drive shaft is provided, the selection can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is a front view of a rotary dobby of the present invention.

FIG. 2 is a front view showing a relationship between a rotary dobby of the present invention and a heald frame.

FIG. 3 is a front view of a conventional rotary dobby.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Drive shaft 15 Eccentric wheel 16 Connecting wheel 17 Engagement selection mechanism 21 Hook / hook (hook) 24 Pin which constitutes a part of rotation prevention member 25 Pin which constitutes a part of rotation prevention member 26 One of rotation prevention members Anti-rotation body constituting part 31 Operating rod (operating member) 32 Operating rod (operating member) 33 Air cylinder

Claims (3)

[Claims] 1. A drive shaft that makes a half turn every one rotation of a loom, an eccentric ring that is supported so as to be relatively rotatable around it, a connecting wheel that is supported so as to be relatively rotatable therearound, A hook provided on an eccentric wheel that engages with or disengages from the concave portion of the drive shaft peripheral surface corresponding to the stop, and at each stop for each half rotation, one of the hooks advances to the position where the hook acts and the other is on the opposite side. A rotary dobby comprising a pair of operating members which retreat from a position where the hook acts. 2. The apparatus according to claim 1, wherein each of the pair of operating members is swingably supported at an intermediate portion, one end of the operating member is an operating portion for a hook, and the other end is connected to an air cylinder. Rotary dobby. 3. The rotary dobby according to claim 1, further comprising an anti-rotation member for preventing the connecting wheel from rotating with respect to the eccentric wheel when the drive shaft is stopped every half rotation.