JPH031413B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake device for a forward and reverse rotation type Jacquard machine, and in particular has a rotating shaft for operating needles for achieving thread weaving, and the rotating shaft is rotated at a predetermined position. In a forward/reverse rotation type jacquard machine that rotates in forward and reverse directions with a phase difference of This invention relates to a brake device for a forward and reverse rotation type Jacquard machine.

[Prior Art] A jacquard machine, commonly known as a loom, is provided with a rotating shaft that operates via a cam the thread needles that accomplish the thread weaving. The thread needle is operated by rotating in one direction based on the information.

On the other hand, if a weft thread breaks and is not fed according to the information entered on the card or when a weft thread is fed between the warp threads and is woven, it is necessary to pull out that thread or the previous thread, and such In order to cope with the situation, it is necessary to temporarily rotate the rotating shaft in forward and reverse directions, and the jiacard machine is provided with a device for rotating the rotating shaft in forward and reverse directions.

[Problems to be Solved by the Invention] By the way, the yarn needle that is operated by the rotational drive of the rotating shaft is connected to the rotating shaft via a cam and a lever mechanism. If the rotation timing during forward and reverse rotation is set to the same position when shifting to reverse rotation drive, there will be a difference in the timing during reverse rotation, and the thread needle will not move at the position of the hole opened based on the information entered on the card. The operation cannot be controlled. Therefore, when the rotating shaft rotates in forward and reverse directions, the timing is adjusted at the contact point between the opening part and the selection command part, that is, the drive origin of the selection command part, in order to prevent the timing between the opening part and the selection command part from changing. Normally, the timing for forward and reverse rotation is set using a phase difference of 230°.

Therefore, conventionally, a timing adjustment device as shown in Fig. 7 has been adopted, and this device has an arc-shaped elongated hole b opened at a predetermined angle in a disc a, and a drive pin is inserted along the elongated hole b. The phase of the rotating shaft is adjusted by engaging the member c. That is, if one end of the elongated hole b (point A in the figure) is set as the normal rotation position, during reverse rotation, the drive pin member c moves from the normal rotation position along the elongated hole b and reaches the other end (point B in the figure). When this happens, the timing for reverse rotation is set based on a phase difference of a predetermined angle.

However, in the past, the drive pin member c simply moved along the elongated hole b to adjust the timing, which was a relatively simple configuration, so if the jiacard machine suddenly stopped or load fluctuations occurred, If the rotating shaft overruns or reverses,
There was a problem in that the position of the drive pin member c deviated from the forward/reverse rotation position of the elongated hole b, and the timing during forward/reverse rotation was deviated.

The present invention has been devised to effectively solve the above problems.

The present invention makes it possible to maintain the rotating shaft at a predetermined phase position in a forward-reverse rotation type jacquard machine in which the rotating shaft that operates the thread needle for thread weaving is driven to rotate forward and backward with a predetermined phase difference. It is an object of the present invention to provide a brake device for a forward/reverse rotation type Jacquard machine that can prevent deviations in the rotation timing of a shaft.

[Means and effects for solving the problems] The present invention is a forward-reverse rotation type that has a rotating shaft for operating thread needles that achieve thread weaving, and drives the rotating shaft to rotate forward and backward with a phase difference of a predetermined angle. In the Jacquard machine, there is a torque limiter installed at one end of the rotating shaft that allows the rotating shaft to rotate when a torque of a certain value or more is applied to the rotating shaft, and a torque limiter that is connected to the torque limiter and controls the rotating shaft in the normal rotation direction. A clutch is provided on the other end of the rotating shaft and is connected to the drive source of the rotating shaft, and the clutch rotates at a predetermined angle relative to the rotating shaft when the rotating shaft rotates in forward and reverse directions. It consists of a cam that is integrally connected to transmit power from the drive source, and a brake means that applies a braking force to the rotating shaft according to the undulations formed on the outer edge of the cam. When the load fluctuates during rotation or suddenly stops, the clutch or brake means applies a braking force to the rotating shaft to stop the rotating shaft, guides and holds the cam at a predetermined phase position, that is, the forward/reverse rotation position, and stops the rotating shaft. This prevents deviations in rotation timing.

[Example] An example of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a forward and reverse rotation type Jacquard machine according to the present invention.

As shown in the figure, the jacquard machine is provided with a rotating shaft 1 for controlling the operation of thread needles that accomplish thread weaving, and the thread needles are connected to this rotating shaft 1 via a cam 2 and a lever mechanism (not shown). Ru.

In addition, the rotating shaft 1 is the frame 3 of the jiacard machine,
4 is supported at both ends, and a frame 3 is supported on one end side.
A torque limiter 5 fixedly supported is provided.

This torque limiter 5 has a boss portion 6 surrounding the rotating shaft 1, and a sprocket 7 is attached to the boss portion 6.
A spring 8 is provided which urges the sprocket 7 in the axial direction, and this spring 8 is supported at one side by a support member 9 so as to urge the sprocket 7 in the axial direction.
Therefore, when a large torque greater than a certain value that exceeds the biasing force of the spring 8 is applied to the rotating shaft 1, it slips and the rotating shaft 1 is configured to be allowed to rotate.

A clutch 12 is connected to the torque limiter 5 via a chain 10 and a sprocket 11.

This clutch 12 is configured to rotate the rotary shaft 1 in only one direction and restrain the rotational drive of the rotary shaft 1 when rotating in the opposite direction. Therefore, the rotating shaft 1 will temporarily stop during reverse rotation.

On the other hand, on the other end side of the rotating shaft 1, there are shown in FIGS.
As shown in the figure, a rotatably supported heart-shaped cam 13 is incorporated via a bearing 14.

This cam 13 is provided with a sprocket 15, and a sprocket 17 on the drive source side is connected to this sprocket 15 by a chain 18 via a sprocket 16 supported by the frame 4.

Further, a drive pin member 19 is provided on one side of the cam 13.
is inserted, and a diamond-shaped boss 20 is provided so as to be rotationally driven integrally with the rotating shaft 1 via the drive pin member 19, and this boss 20 has a first
As shown in FIG. 3, the drive pin member 19
An elongated hole 21 is opened in an arc shape for shifting the angle at a predetermined angle. Therefore, when power is transmitted from the drive source to the cam 13 and the drive pin member 19 moves from one end A of the elongated hole 21 to the other end B as the cam 13 rotates, the cam 13 becomes relative to the boss 20. It is configured to rotate by a predetermined angle and to be integrally connected to the rotating shaft 1.

Further, an undulating rolling surface having a concave portion 22 is formed on the outer edge of the cam 13, and a cam roller 23 that rolls along the rolling surface is engaged with the cam roller 23. It is provided on a disc 24 surrounding the boss 20.

This disc 24 is pivotally supported at one end of the diamond-shaped boss 20 via a pin 25, and is configured to move up and down around the boss portion 13 along the outer edge of the cam 13 via a cam roller 23. .

Further, the rotating shaft 1 is provided with a drum 26, and this drum 26 is provided with a braking means for applying a braking force to the rotating shaft 1 in accordance with the undulations formed on the outer edge of the cam 13.

In this embodiment, as shown in FIGS. 1 and 4, the braking means is constituted by a band brake 27, which includes a band 28 that engages with the outer periphery of the drum 26 and a It consists of a brake shoe 29 provided on the inner circumference.

As shown in FIGS. 2 and 5, one end of the band 28 is connected to a pin 25 that is a pivot portion of the boss 20, and the other end is an engagement pin extending horizontally from the disc 24. 30, as shown in FIGS. 2 and 6.
The other end of the band 28 is biased against the engagement pin 30 via a spring 31.

Therefore, the drive pin member 23 separates from the recess 22 formed at the outer edge of the cam 13 and the disc 24
is lifted radially outward, and following this, a tensile force is applied to the other end of the band 28, and the band 28
The brake shoe 29 is pressed against the drum 26, and a braking force is applied to the rotating shaft 1.

Next, the operation of the present invention will be described.

As shown in FIG. 1, a jacquard machine normally drives a rotating shaft 1 in forward rotation to achieve thread weaving, and a cam roller is installed in the recess 22 of the cam 13 to allow rotation of the rotating shaft 1 during forward rotation. 23 is engaged and the clutch 12 is connected to the rotating shaft 1.
And the band brake 27 is released. Therefore, the rotating shaft 1 is driven to rotate in a no-load state.

In addition, when a load fluctuation occurs in the jiacard machine, the cam roller 23 is lifted from the recess 22 of the cam 13, and the disc 24 is lifted accordingly, so the band connected to the disc 24 is lifted. 28 extends and comes into pressure contact with the drum 26, and the braking force of the band brake 27 acts on the rotating shaft 1. Therefore, the rotating shaft 1 is held at the normal rotation position (A in FIG. 2), and deviations in rotation timing caused by load fluctuations can be prevented.

Furthermore, when the Jacquard machine suddenly stops, the rotating shaft 1 backs up or overruns, but in the present invention, when the back phenomenon occurs, the rotating shaft 1
The clutch 12 connected to the rotating shaft 1 is operated, and the rotating shaft 1 is not rotated in the reverse direction. Also, even during overrun, the cam 13
The cam roller 23 moved from the recess 22 of the disc 2
4, and apply the band brake 27 to the drum 26.
Since a braking force of 1 is applied, overrun of the rotating shaft 1 can be prevented.

On the other hand, if thread breakage or the like occurs, the rotating shaft 1 is shifted from forward rotation drive to reverse rotation drive.

First, when attempting to reverse the rotating shaft 1, a reverse rotational force is transmitted from the spring 17 of the drive source to the cam 13, and the drive pin member 1 inserted into the cam 13
9 is moved from the forward rotation position (A in FIG. 2) of the elongated hole 21 formed in the boss 20 to the reverse rotation position (B in FIG. 2). During the movement of the drive pin member 19, the torque limiter 5 and clutch 12 are connected to the rotation shaft 1 to ensure relative movement of the cam 13 and the drive pin member 23 with respect to the rotation shaft 1.
A braking force consisting of the band brake 27 is activated, and the rotating shaft 1 is brought to a stopped state.

After the drive pin member 19 reaches the reverse position of the elongated hole 21, the cam 13 is engaged with and integrally connected to the rotating shaft 1, and the braking force of the clutch 12 is applied and connected to the clutch 12. When the frictional force of the torque limiter 5 acts on the rotary shaft 1 and a larger reverse rotational torque is applied to the rotating shaft 1, the rotating shaft 1 overcomes the frictional force of the torque limiter 5 and is driven to rotate in the reverse direction. That is, since the rotation of the torque limiter 5 is regulated by the clutch 12, when a torque exceeding a certain value is applied,
This allows the rotating shaft 1 to be driven in the opposite direction by slipping.

Also, when returning from reverse rotation to normal rotation, the braking force of the clutch 12 is released.
The braking force of the band brake 27 continues to act on the rotary shaft 1 during reverse rotation, so the rotary shaft 1 is stopped and the drive pin member 19 of the cam 13 is inserted into the elongated hole 21 formed in the boss 20. It will move from the reverse rotation position to the normal rotation position. This drive pin member 1
When the rotation axis 9 reaches the normal rotation position of the elongated hole 21, the rotation axis 1
The cam 13 is integrally connected, the cam roller 23 is engaged with the recess 22 of the cam 13, and at the same time the disc 24, which had been pushed up by the cam roller 22, returns to the normal rotation position. .
For this reason, the band 2 whose one end is connected to the disk 24
8 became loose and the band 28 that was acting on the drum 26
The pressing force of is released, the braking force of the band brake 27 is released, the rotating shaft 1 is allowed to rotate forward, and the rotating shaft 1 is rotationally driven in a no-load state.

In this way, the present invention prevents the rotating shaft
Since the braking force by the clutch 12 or the band brake 27 is applied to the rotation shaft 1, the rotation of the rotating shaft 1 is restrained, and a shift in the rotation timing of the rotating shaft 1 can be prevented.

[Effects of the Invention] In summary, according to the present invention, when a load fluctuation occurs in the Jacquard machine or a sudden stop occurs, a braking force by a clutch or a band brake is applied to the rotating shaft to restrain the rotation of the rotating shaft. The rotating shaft can be held at a rotational position with a predetermined phase difference, and deviations in the rotation timing of the rotating shaft can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing a brake device for a forward and reverse rotation type Jacquard machine according to the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. FIG. 4 is a view taken along the - line in FIG. 1, and FIGS. 5 and 6 are enlarged views showing the main parts of the brake means.
FIG. 7 is a diagram showing a conventional example. In the figure, 1 is the rotating shaft, 5 is the torque limiter, 12
is a clutch, 13 is a cam, and 27 is a band brake.

Claims (1)

[Claims] 1. In a forward/reverse rotation type jacquard machine which has a rotating shaft for operating thread needles for achieving thread weaving and drives the rotating shaft in forward and reverse rotation with a predetermined phase difference, a a torque limiter that allows rotation of the rotating shaft when a torque of a certain value or more is applied to the rotating shaft; a clutch that is connected to the torque limiter and rotates the rotating shaft only in the forward rotation direction; a cam that is provided and connected to the drive source of the rotary shaft, rotates at a predetermined angle relative to the rotary shaft during forward and reverse rotation of the rotary shaft, and then is integrally connected to the rotary shaft to transmit power from the drive source; 1. A brake device for a forward/reverse rotation type Jacquard machine, comprising: and a brake means for applying a brake force to a rotating shaft according to undulations formed on the outer edge of the cam.