JPH0733611B2 - Anomaly detection method for shedding motion in loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a method for detecting anomalous shedding motion in a loom.

(Prior Art) Accurate shedding motion of warp yarns during operation of a loom is extremely important for obtaining a good quality woven fabric. As a method of detecting this abnormal opening movement,
There is a depolarizing opening device that adopts a method of transmitting a spring action by a rope disclosed in Japanese Patent Laid-Open No. 56-28083. This device is intended to eliminate the uneven extension due to the length difference between the pair of ropes connected to the left and right ends of the heald frame. Using a rigid rod, the ropes of different lengths connected to the left and right ends of the heald frame are evenly stretched to eliminate the left and right opening movement unbalance of the heald frame. However, the above device does not take measures against the problem that the position of the heald frame rises as the rope extends and the opening position shifts.

Therefore, the present applicant has proposed the following device in Japanese Utility Model Application No. 61-045220.

The above-mentioned device spring mechanism and cam mechanism are of a system in which they are transmitted by a rope, and when the heald frame moves beyond its upper movement allowable position, it detects a detected member provided on the upper side of both side stays. The extension of the rope is detected. In this device, in addition to the unbalance of the opening movement, the two problems of the deviation of the opening position are solved.

(Problems to be Solved by the Invention) However, the heddle frame repeats up and down movements at a substantially constant cycle to maintain a normal opening timing, whereby good weft insertion is performed. In the above device, no countermeasure is taken against the fundamental problem of the opening timing deviation due to the deviation of the heald frame movement cycle.

Also, when the heddle frame is lowered, the heddle frame is pulled downward by the rope due to the cam action, but even when the heddle frame is raised, the rope still moves downward due to the inertia, which adversely affects the movement of the heddle frame. May be given. Furthermore, during high-speed operation of the machine base, the rotation of the cam becomes faster, the cam follower may jump from the cam surface, and the heddle frame may shift from the predetermined moving position. All of these malfunctions impede normal opening movement, but no measures have been described for avoiding the malfunction in the above device.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention sets an allowable movement position in both up and down directions of the heddle frame, and
The moving position of the heddle frame between these two allowable movement positions is detected, and the detection result and the machine base rotation angle are compared and calculated to determine whether or not the comparison result is within a predetermined allowable value. The means for detecting whether or not there is an abnormality in the opening movement according to the result of this determination is adopted.

(Operation) By adopting the above-described means, the present invention determines whether or not the heald frame between the upper and lower movement allowable positions moves within a predetermined constant period, and based on this determination result, the opening movement is performed. The presence or absence of abnormality is detected.

(Embodiment) An embodiment in which the present invention is embodied in a depolarizing opening device will be described in detail below with reference to the drawings.

Opening brackets B are fixed on the pair of left and right side frames F, and jack levers 4 and 5 are attached to each opening bracket B. The jack levers 4 and 5 are urged to rotate by springs 1 and 2 attached to the outer protruding portion Ba of the opening bracket B. Same jack lever 4,
Lifting ropes 6 and 7 are hung on the lifting rope 5, and the heddle frame 3 is hung on the lifting ropes 6 and 7 via the hook connecting members 8 and 9. The heald frame 3 is composed of a pair of side stays 10 and 13 arranged on the left and right and a pair of upper and lower horizontal bars 23a and 23b installed between them, and one of the heald frames 3 for hooking the hook connecting member 8 The pull-down rope 11 is connected to the lower end of the side stay 10 through the hook connecting member 12, and the pull-down rope 14 is hook connected to the lower end of the other side stay 13 that hooks the hook connecting member 9. They are connected via a member 15. The left and right pulling ropes 11 and 14 are connected to the cam lever 18 via the guide rollers 16 and 17, and the cam lever 18 presses the cam surface of the cam 19 which rotates in synchronization with the machine base by the action of the springs 1 and 2. It is supposed to be done. Therefore, due to the rotation of the cam 19 and the action of the springs 1 and 2, the heald frame 3
Are reciprocally moved up and down to perform an opening forming motion.

A cylinder-shaped potentiometer 21 is attached to the inner surface of one opening bracket B via an L-shaped sensor bracket 20, and a contact rod 22 protruding downward from the lower end thereof is inside the meter case 21a. In the above, there is always a downward biased state by an appropriate biasing means.
The abutting rod 22 of the potentiometer 21 penetrates the horizontal portion 20a of the sensor bracket 20 and extends downward, and its tip is formed at a position corresponding to the upper horizontal bar 23a on the outer upper portion of one side stay 10. It is in contact with the upper surface of the locking projection 24.

Further, as shown in FIG. 3, the potentiometer 21 is electrically connected to the control unit 25, and the control unit 25 outputs and displays the calculation result of the machine base rotation angle detection device 26 and the control unit 25 and displays the set value. The input / output unit 27 that inputs to the control unit 25 is electrically connected, and the input / output unit 27 is also electrically connected to the display unit 27a. In addition, the control unit 25 preliminarily provides an upper movement allowable position and a lower movement allowable position of the heddle frame 3, and further a normal movement path and a normal movement path through which the heddle frame 3 continuously moves in a constant cycle. When the allowable error value for the route is input and the heddle frame 3 reaches the abnormal position either above or below the allowable movement position, the potentiometer 21
A position abnormality display is displayed on the display unit 27a in accordance with the signal from. It should be noted that this display operation can be replaced by an alarm operation or a machine stop operation.

In the above structure, when the heddle frame 3 descends from the upper allowable position toward the lower allowable position, the abutting rod 22 of the potentiometer 21 follows the displacement of the locking projection 24 of the side stay 10 and the meter. Protruding from the case 21a,
A position signal based on the movement of the contact rod 22 is output to the control unit 25. Then, the control unit 25 compares the position signal with the rotation angle signal output from the machine base rotation angle detection device 26, and based on the comparison result, the deviation between the position signal and the rotation angle signal is predetermined. When the allowable error value is exceeded, the control unit 25 issues an opening operation abnormality signal,
Countermeasures such as machine stop, warning, and display are performed. Therefore, the deviation of the opening timing of the warp yarns is prevented in advance, and the weft insertion failure or the like due to the deviation of the opening timing is avoided.

Subsequently, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, upper and lower horizontal bars 23 of both side frames F are used.
A pair of upper and lower mounting frames 34a, 3 provided at positions corresponding to a, 23b
4b is provided with light emitting / receiving elements 28, 29 and 30, 31, respectively, and further, both side stays 10, 13 of the heddle frame 3 are provided with a pair of upper and lower detected members 32, 33, respectively. Then, the heddle frame 3 moves up and down between the positions where the upper detection target member 32 and the lower detection target member 33 are detected by the upper light projecting / receiving elements 28, 29 and the lower light projecting / receiving elements 30, 31, respectively. The control unit performs a comparative calculation process on the time signal and the machine base rotation angle signal, and if the deviation between the time signal and the rotation angle signal exceeds a preset allowable error value in this comparison result, the occurrence of an abnormal opening operation is detected. It is configured.

Further, in the present embodiment configured to detect an abnormality in the left and right height positions of the heddle frame 3, it is also possible to detect an imbalance in the extension of the left and right pull-down ropes 11 and 14 which is a cause of the opening failure.
In the first embodiment as well, if the potentiometers 21 are arranged on the left and right sides of the heddle frame 3 to detect the left and right heights of the heddle frame 3, the same effect as described above can be obtained.

As described above in detail, the present invention detects the moving position of the heddle frame between the upper and lower movement allowable positions of the heddle frame and determines whether the heddle frame is moving in synchronization with the machine base rotation angle. By judging whether or not there is an abnormality in the opening movement by judging whether or not there is an abnormality, it is possible to achieve an excellent effect that good weft insertion can be performed without causing an abnormality in the opening timing.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of its main part, FIG. 3 is a side view of FIG. 1, and FIG. 4 is a second view of the present invention. It is a perspective view showing an example. The heddle frame 3, the machine stand rotation angle detection device 26.

Claims (1)

[Claims] 1. The upper and lower movement allowable positions of the heddle frame are set, the movement position of the heddle frame between these both movement allowable positions is detected, and the detection result and the machine base rotation angle are compared and processed. A method for detecting an abnormality in shedding motion in a loom that determines whether or not the comparison result is within a predetermined allowable value and detects whether there is an abnormality in shedding motion according to the determination result.