JPS638786Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a delivery device for a loom.

In a weaving machine's delivery device, for example, a warp delivery device, in order to keep the warp delivery force constant, the rotational speed of the beam is gradually increased as the warp delivery beam diameter decreases to keep the warp delivery amount constant. For this reason, it is generally known to use a continuously variable transmission in the drive system of the warp delivery beam. A speed change lever that changes the speed ratio of the transmission is connected to a warp sending force detection lever (tension lever). Since the tension lever fluctuates in response to changes in the warp delivery force, this variation moves the speed change lever to change the power transmission rate of the drive system, thereby changing the rotational speed of the warp delivery beam. In this way, the warp delivery amount is changed and the warp delivery force is kept constant.

Incidentally, warp tension fluctuations include those that gradually change over a long period of time due to a decrease in the sending beam diameter, as well as short-period fluctuations that occur due to shedding motion of the warp threads or vibrations of the loom itself. If this short-period fluctuation is transmitted to the speed change lever via the tension lever, the speed change lever will cause slight vibrations, which may shorten the life of the speed change gear or cause the amount of warp yarn to be delivered to change in small increments. occurs.

For this reason, there is generally mechanical play in the transmission system between the tension lever and the gear shift lever (i.e., even if one of the members operatively connected to each other moves, the other member will not move in response if the magnitude is within a certain range). The effect of short-term fluctuations on the gear shift lever is reduced by providing a mechanical gap (as shown in the figure) between the two members. In other words, even if the tension lever moves slightly due to the short-term fluctuations mentioned above,
This mechanical play absorbs the slight movement and prevents it from being transmitted to the gear shift lever.

However, in reality, the gear shift lever may move in one direction or move slightly due to causes from the transmission side.
Therefore, even if mechanical play is provided, the effect is incomplete and short-period fluctuations on the tension lever side are transmitted to the gear shift lever. That is, rotation is input to the transmission from its input shaft, which generates torque at the gear shift lever, and this torque changes depending on the angular position of the gear shift lever, as shown in FIG. Therefore, when this torque is large, the shift lever is positioned by shifting the mechanical play of the transmission system between the shift lever and the tension lever to one side by the action of this torque. Therefore, short-period fluctuations in the tension lever are directly transmitted to the gear shift lever.

The object of this invention is to provide a delivery device that can reliably prevent rotation of the speed change lever due to this rotational torque generated in the speed change lever.
Therefore, in this invention, the transmission system between the mechanical play and the gear shift lever is brought into a braking state by a torque (maximum holding torque) that is large enough to prevent the gear shift lever from rotating due to the rotational torque generated by the transmission. The gist is that. Furthermore, this maximum holding torque can stabilize the delivery amount and keep the warp tension constant without interfering with long-term fluctuations of the tension lever due to changes in the delivery beam diameter or excess or deficiency in the delivery amount. , increase the mechanical life of the transmission, make the driving density uniform, and improve the quality of the woven fabric.

Next, this invention will be explained in detail using the accompanying drawings.

FIG. 2 shows an embodiment in which this invention is applied to a warp delivery device, in which the warp Y wound around a warp beam (not shown) is passed through a tension roll 1 at an arrow A.
is sent in the direction of One end of the tension roll 1 is loosely fitted into a tension lever 2, and the tension lever 2 is structured to be rotatable about a fulcrum P that is fixed to the loom main body.

One end of a lever 3 is attached to the front side of the tension lever 2 in the figure via a transmission mechanism such as a rod. The other end of the lever 3 is tightly fitted to the shaft 4,
The lever 3 moves together with the shaft 4. A bracket 5 fixed to the loom frame is loosely fitted in the center of the shaft 4, and the shaft 4 is supported by the bracket 5 and rotates about the bracket 5 as a fulcrum as described below.

One end of a brake drum 6 and a lever 7 are each loosely fitted onto the shaft 4, and one end of a release lever 8 is also firmly fitted. brake drum 6
and lever 7 are integral, and a gear shift lever 11 of a transmission 10 is attached to the other end of lever 7 via a rod 9. And on the outside of the brake drum 6 there is a brake shoe 12 fixed to the frame.
is provided, and the outer periphery of the brake drum 6 is pressed against the outer periphery of the brake drum 6 by the elastic force of the spring 13 provided at the brake shoe port. Therefore, a braking force is applied to the brake drum 6 by the brake shoe port. This braking force is made large enough to apply a torque greater than the maximum holding torque to the lever 7. Furthermore, as shown in FIG. 3, the lever 7 is surrounded by the wing section 81 of the release lever 8, and the tip of the adjustment bolt attached to the wings 82, 83 of the wing section 81 and the lever 7 are connected to each other. A gap (ie mechanical play) is provided in between.

As a result of the above configuration, when the tension of the warp yarn Y fluctuates up and down due to the warp shedding movement while the loom is in operation, this fluctuation first passes through the tension roll 1, the tension lever 2, and then the lever 3. communicated. The vibration is then transmitted from the lever 3 to the release lever 8 via the shaft 4 as vibration in the shaft circumferential direction. Furthermore, the vibration of the release lever 8 is transmitted to the lever 7 via the adjustment bolts attached to the wings 82 and 83. At this time, the width of the vibration of the release lever 8 is
If it is smaller than the gap (mechanical play) between the adjustment bolt attached to 2, 83 and the lever 7, the vibration will not be transmitted to the lever 7 at all, and if it is larger, the vibration will be less than the mechanical play. The signal is transmitted to the lever 7. Therefore, in order to prevent the short-term fluctuations of the tension lever 2 from being transmitted to the speed change lever 11, this mechanical play can be increased, but on the other hand, the ability to follow long-term fluctuations in warp thread tension decreases. Taking these factors into consideration, it would be ideal to match the magnitude of the mechanical play to the width of the short-term fluctuations of the lever 7. However, this is based on the assumption that the brake drum 6 is working and the transmission system between the lever 7 and the speed change lever 11 remains in the left position.

On the other hand, rotational torque acts on the shift lever 11 of the transmission 10, and this rotational torque is transmitted to the lever 7 via the rod 9, causing the lever 7 and the brake drum 6 to rotate clockwise or counterclockwise with respect to the shaft 4. Act as a force. And the gear lever angle is θ ₁
When the rotational torque acting on the transmission 10 is a positive torque as shown in FIG. 1, the shift lever 11 attempts to rotate in the direction B in FIG. 3. (In FIG. 3, clockwise torque is defined as positive torque.) Therefore, when the brake force from the brake shoe 12 is not acting on the brake drum 6, the lever 7 rotates in the direction C, and the lever 7 rotates in the direction C.
is connected to the adjustment bolt attached to the wing 83 to stop its rotation. Moreover, since this torque acts in a direction that tends to maintain this joining relationship, vibrations that are synchronized with the short-period fluctuations of the tension lever 2 of the joined adjustment bolt are directly transmitted to the shift lever 7. However, when a brake torque greater than the torque applied to the shift lever 11 is applied to the brake drum 6, the shift lever 11 is rotated only by the release lever 8, which has a great force. Therefore, when the lever 7 is pushed up by the adjustment bolt on the wing 83 side, the gear shift lever 11 is held at its uppermost position by the braking force. Moreover, since the gap between the adjustment bolt and the lever 7 is adjusted to be slightly larger than the maximum width of the short-term fluctuation of the lever 7, the adjustment bolt on the wing 82 side will not be pushed down from that position. The opposite is true when the wing 82 is pushed down by the adjustment bolt on the wing 82 side. In either case, the speed change lever 11 will not deviate from its normal position unless the warp tension changes.

In reality, between the lever 7 and the speed change lever 11, in addition to the force due to the rotational torque of the speed changer 10, a force generated by, for example, the vibration of the loom itself also acts.
Therefore, if the magnitude of the braking force is changed to a magnitude capable of suppressing these forces, the influence of these forces on the gear shift lever 11 can be more completely prevented.

In the embodiment, braking is applied to the lever 7 using a brake device consisting of a brake drum 6 and a brake shoe 12, but other parts of the transmission system from the lever 7 to the gear shift lever, such as the rod 9 or the gear shift lever, are used to apply braking. may be in a braking state.

As described above, according to this invention, the influence of the rotational torque generated by the transmission can be eliminated, and the gear shift lever can always be held at the optimum position. Therefore, unnecessary vibrations of the gear shift lever can be eliminated, thereby increasing the mechanical life of the transmission. Furthermore, when used in a warp delivery device, for example, the warp tension during weaving can be kept constant and the weft thread density can be made uniform, so that the quality of the woven fabric can be improved.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the relationship between the lever angle and rotational torque of the gear shift lever, Fig. 2 is a perspective view showing an embodiment of this invention, and Fig. 3 is a plan view showing the relationship between various parts of the embodiment. It is. 1... Tension roll, 2... Tension lever, 6... Brake drum, 8... Release lever, 10... Transmission, 11... Speed change lever, 1
2...Brake use.

Claims (1)

[Claim for Utility Model Registration] A tension lever 2 that detects the sending force from the sending beam, and a gear ratio that changes according to the position of the speed change lever 11, and the rotational speed of the sending beam is controlled via a power mechanism. a transmission 10 to be changed; a transmission system 3, 4, 7, 8, 9, 11 having mechanical play in its structure and transmitting the movement of the tension lever to the transmission lever; A delivery device for a loom, comprising brake mechanisms 6, 12, and 13 for applying a braking force greater than the maximum holding torque to a portion rearward of the mechanical play.