JPH031503Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a drum-type length measurement storage device, and in particular to a locking pin that controls the unwinding and locking of the weft thread wound around the outer peripheral surface of the length measurement storage drum. This relates to a drive device.

Prior art A drum-type length measuring storage device winds a weft thread around the outer peripheral surface of a length measuring storage drum in a stationary state through the rotational movement of a rotating yarn guide, and unwinds and locks the wound weft thread in a reciprocating straight line. Controlled by a movable locking pin.

Traditionally, this locking pin was driven by a cam. With a cam-type drive means, followability during high-speed rotation is a problem, fine adjustment is difficult, and it cannot be flexibly applied to multi-color free selection looms.

Therefore, a drive method using a solenoid has been developed. Although solenoid-type drive means have good operability during high-speed operation, the impact of the plunger is large and the durability of the sliding parts becomes a problem.
Furthermore, uniform control becomes difficult due to changes in responsiveness due to wear of the spring for returning the plunger and variations in its elasticity.

In this way, with any drive means, followability,
Since problems remain in terms of durability, control characteristics, etc., an appropriate alternative drive means is desired.

Purpose of the invention Therefore, the purpose of the present invention is to make it possible to drive a length measurement storage locking pin that overcomes the above-mentioned drawbacks, that is, has excellent durability and does not cause variations in response.

Therefore, in the present invention, the unwinding and locking by the linear reciprocating motion of the locking pin is performed using part of the rotational motion, and a pulse motor is used as the drive source for the reciprocating rotational motion. are doing. This pulse motor normally performs a reciprocating rotational motion in one step, so that the stored weft is unwound on the drum at the weft unwinding timing, and the weft is unwound on the drum at the subsequent locking timing. to lock.

In this way, the pulse motor changes the rotation direction at the unwinding timing and the locking timing, but such control compares those timings set in advance with the rotation angle of the loom, This is done based on those comparison signals. Therefore, the pulse motor is usually controlled to rotate in the forward direction and in the opposite direction within one step.

Configuration of the Embodiment FIG. 1 shows an outline of a drum-type length measurement and storage device 1, which is the premise of the present invention. This drum-type length measurement storage device 1 includes, for example, a stationary drum 2, a rotating yarn guide 3 that rotates on the same axis as the drum 2, and a locking pin 4 for length measurement storage as a driving object of the present invention. ing. The rotating yarn guide 3 draws out the weft yarn 5, winds it around the outer peripheral surface of the drum 2, stores it, and measures the length.
During this time, the locking pin 4 advances to the outer peripheral surface of the drum 2 and locks the weft on the drum 2, but at the timing of weft insertion, that is, the timing of unwinding, the locking pin 4 moves back, allowing the weft yarn 5 to be inserted. After wefting one pick, the weft thread 5 is again locked on the drum 2 in preparation for the next wefting.

The length measurement storage locking pin driving device 6 of the present invention is equipped with a pulse motor 7 as a drive source for the locking pin 4, and a control unit 8 for driving the pulse motor 7. It is equipped with The pulse motor 7 is arranged near the drum 2 in a direction perpendicular to its axis, for example, and is connected to the locking pin 4 at an output shaft 9 in a perpendicular state. Note that the locking pin 4 of this embodiment is bent in a U-shape, and its tip portion fits into the groove 2a of the drum 2 in the generatrix direction.

On the other hand, FIG. 2 shows the configuration of the control section 8. As shown in FIG. The rotation angle of the loom is detected by a rotation angle detector 11 connected to its main shaft 10, and the unwinding timing θ ₁ and the locking timing θ ₂ are each set by a setting device 12. Both of these are connected to the input shaft of a comparator 13, and the output side of the comparator 13 is connected to the input side of a drive circuit 14 connected to the pulse motor 7.

Effects of the Embodiment The drum-type length measurement and storage device 1 rotates the rotating yarn guide 3 in synchronization with the rotation of the main shaft 10 of the loom with respect to the drum 2 which is in a stationary state, and moves the weft yarn 5 to the drum 2.
Wrap it around the outer circumferential surface of the During this time, the locking pin 4 locks the weft yarn 5 wound on the drum 2 at the position shown by the solid line in FIG.
At the unwinding timing θ ₁ , it retreats to the position shown by the imaginary line, unwinds the weft yarn 5 after the length measurement and storage on the drum 2, and makes it ready for wefting, and after the wefting is completed, it is again shown by the solid line. Advance to position and weft thread 5 again
to lock.

Such reciprocating rotational movement of the locking pin 4 is performed by a pulse motor 7 and controlled by a control section 8. That is, the rotation angle detector 11
detects the rotation angle θ of the main shaft 10 and sends the signal to one input end of the comparator 13. Therefore, the comparator 13 inputs the unwinding timing θ ₁ and the locking timing θ ₂ from the other input terminal, compares them with the rotation angle θ, and calculates the rotation angle θ from the unwinding timing θ ₁ to the locking timing θ ₂ . During the period, a comparison signal A of "H" level as shown in FIG. 3 is generated and sent to the drive circuit 14. This drive circuit 14 causes the pulse motor 7 to rotate in the unwinding direction, that is, counterclockwise in FIG. , the pulse motor 7 is driven in the opposite phase direction, that is, the output shaft 9 is driven in the locking direction.
In this way, the pulse motor 7 performs reciprocating rotational motion within a range of one step angle of, for example, 15 degrees,
Motion is given to the locking pin 4 in the unwinding and locking directions.

Modification of the invention In the above embodiment, the locking pin 4 is moved on a plane including the axis of the drum 2.
The reciprocating rotational movement may be performed on a plane perpendicular to the axis of the drum 2, as shown in FIG. In this case, since the direction of action of the tension on the weft thread 5 at the time of locking is set perpendicular to the movement direction of the locking pin 4, the torque (driving torque and holding torque) of the pulse motor 7 is different from that of the previous embodiment. It may be small compared to other things.

In addition, the response speed of the pulse motor 7 sufficiently follows the high-speed loom, but the following characteristics can be further accelerated by applying a drive voltage higher than the rated value when driving the pulse motor 7, which is called overexcitation. .

Effects of the invention The invention provides the following unique effects.

Since the forward and backward movement of the locking pin becomes part of the rotational movement and is obtained by the pulse motor, accurate reciprocating rotational movement can be achieved with sufficient responsiveness.

Pulse motors do not have sliding parts like solenoids, the locking pin is supported along with the output shaft by ball bearings with small rolling resistance, and there are no sliding parts such as brushes.
Furthermore, since there is no large impact during exercise, you can expect excellent durability and stable operation.

Furthermore, since a return spring such as a solenoid is not required, there is no variation in response due to this, and control characteristics are improved.

Furthermore, in a pulse motor that has a permanent magnet in its rotor, such as a permanent magnet type or a hybrid type, there is a holding torque in the non-excited state.
Since the locking pin at the unwinding position or the locking position is stopped in a stable state, even if the power is cut off during operation, there is no problem that the weft continues to flow out.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the drum-type length measurement storage device, Fig. 2 is a block diagram of the drive device for the length measurement storage locking pin of the present invention, and Fig. 3 is a time chart during operation. FIG. 4 is a partially cutaway front view of another embodiment. 1...Drum-type length measurement storage device, 2...Drum,
3... Rotating yarn guide, 4... Locking pin, 5...
... Weft thread, 6 ... Length measurement storage locking pin drive device, 7 ... Pulse motor, 8 ... Control unit, 9 ...
Output shaft, 10... Main shaft of the loom, 11... Rotation angle detector, 12... Setting device, 13... Comparator, 14...
...Drive circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Wrapping the weft yarn around the outer circumferential surface of the length measurement storage drum by the rotational movement of a rotating yarn guide, and unwinding the wound weft yarn by the reciprocating movement of the locking pin; and a drum-type length measurement storage device that is locked, a pulse motor provided near the drum and connected to the locking pin with an output shaft in a cross state, and a rotation angle detector that detects the rotation angle of the loom; a setting device for setting the unwinding timing and locking timing of the locking pin; a rotation angle signal from the rotation angle detector;
A comparator that compares the unwinding timing and locking timing from the setting device and generates a drive signal, and this drive signal is input to rotate the pulse motor in the unwinding direction at the unwinding timing, and then 1. A driving device for a length measurement storage locking pin, comprising: a drive circuit that rotates the locking pin in the locking direction at the locking timing. (2) The driving device for a locking pin for length measurement storage according to claim 1, wherein the pulse motor has a permanent magnet rotor.