JP2932736B2 - Heald frame position detecting device in dobby device of loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heald frame position detecting device in a dobby device of a loom.

[0002]

2. Description of the Related Art A command is sent from a central processing unit to an electric drive system constituting a dobby device based on reading of a pattern pattern stored and set in advance, and the individual drive control of a plurality of heald frames is performed by the command. An electronic dobby device for this is disclosed in Japanese Patent Application Laid-Open No. 62-62944. In other words, the dobby drive mechanism uses the rotational driving force of the loom drive motor as the drive source, but the electromagnetic mechanism that makes up the electric drive system excites the dobby drive mechanism and the heald frame side mechanically. In connection, the rotational driving force of the loom drive motor is transmitted to the heald frame via the dobby drive mechanism. According to such an electronic dobby device, the pattern can be easily changed.

[0003]

However, even when the electromagnetic magnet is excited in accordance with the set pattern, if the mechanical drive system in the dobby device and the electromagnetic magnet are not attracted, the upper and lower portions of the heald frame are not moved. The position does not match the set pattern. There are various methods for directly detecting the position of the heald frame, but this direct detection method cannot grasp the occurrence of an abnormal adsorption in the electromagnetic magnet. Moreover, it is difficult to secure a space for installing the position detector near the heald frame that moves up and down at a high speed over a relatively long distance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heald frame position detecting device which can detect occurrence of an abnormal adsorption of an electromagnetic magnet and can easily secure an installation space.

[0005]

According to the present invention, there is provided:
Stores the handle pattern, and pattern-alignment control means for instructing the demagnetization of the electromagnet based on the reading of the memorized pattern pattern, based on a change in the magnetic capacitance interposed on the energizing circuit of the electromagnetic magnet electrical the selector for the electromagnet on the basis of changes to the magnetic capacitance change detector for detecting, on a comparison between the magnetic capacitance change detected magnetic capacitance variation pattern obtained from the detector obtained from the design pattern setting magnetic capacitance change pattern lever
The patterning control means is provided with a function of judging a heald frame vertical position abnormality due to a suction abnormality of the heald frame .

[0006]

[0007]

When the electromagnetic magnet and the mechanical drive system of the dobby device are attracted and released, the magnetic capacity of the electromagnetic magnet changes and an electromotive force is generated. The magnetic capacitance change detector detects the generation of the electromotive force. The patterning control means compares this electromotive force generation pattern, that is, the magnetic capacitance change pattern and the set pattern pattern. If the suction between the electromagnetic magnet and the mechanical drive system is securely performed, the set pattern pattern and the detected magnetic capacitance change pattern accurately correspond to each other. The patterning control means grasps the suction abnormality by comparing the correspondence.

[0008] If the attraction between the electromagnetic magnet and the mechanical drive system is reliably performed, the detected position pattern obtained from the position detector accurately corresponds to the magnetic capacitance change pattern, and does not correspond if an abnormal adsorption occurs.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG. FIG. 1 shows a dobby opening device, in which a plurality of heald frames 1 are urged upward or downward by an opening spring (not shown). Multiple heald frames 1
The opening is formed by the vertical movement of A, 1B, 1C and 1D. The dobby drive mechanism 2 is a mechanical drive system for each heald frame 1A to 1D.
A, 2B, 2C, 2D, electromagnetic magnets 3A, 3B, 3
This is performed by an electronic dobby device comprising C, 3D and a patterning control computer C. Design control computer C
Is connected to an input setting device 4, a rotary encoder 5 for detecting a machine rotation angle, and a display device 6, and the woven fabric pattern is input and set to the design control computer C by the input setting device 4.

As shown in FIG. 2, a patterning cam 7 is operatively connected to the loom driving motor M. Each dobby drive mechanism 2 is in a relationship capable of transmitting an action to the patterning cam 7.
B, 3C and 3D are incorporated. FIG. 3 shows the internal structure of the dobby driving mechanisms 2A to 2D. 8 is a patterning cam 7
The selector lever is reciprocally oscillated between a suction position shown by a solid line and a non-suction position shown by a chain line. The selector lever 8 swings back and forth once for one rotation of the loom, and the swing of the selector lever 8 is transmitted to the pusher bar 9. The pusher bar 9 is supported by a pusher joint 10, and the pusher joint 10 is rotatably supported by a shaft 11.
Numeral 1 reciprocates up and down around a shaft 30.

A pusher pin 9a is fixed to the tip of the pusher lever 9, and command levers 12, 13 are supported above and below the pusher pin 9a so as to be swingable about shafts 14, 15. The lowermost movement position of the upper command lever 12 is regulated by the stopper 16, and the uppermost movement position of the lower command lever 13 is regulated by the stopper 17. The two command levers 12 and 13 are urged in the approaching direction by a tension spring 18, and concave portions 12 a and 13 a are provided on the base edge facing edges of the two command levers 12 and 13. The end of the pusher pin 9a can be fitted into the recesses 12a, 13a, and the vertical swing of the pusher joint 10 can be performed when the electromagnetic levers 3A to 3D are excited.
13 is transmitted. By this swing transmission, the upper command lever 12 moves up, and the lower command lever 13 moves down. When the electromagnetic magnets 3A to 3D are in the demagnetized state, the pusher pins 9
a is fitted into the recesses 12a, 13a, and the vertical swing of the pusher joint 10 is not transmitted to the command levers 12, 13.

Knife hooks 19, 20 are swingably supported by support shafts 21, 22 above and below the command levers 12, 13, and the support shafts 21, 22 move left and right in opposite directions. Both command levers 12 and 13 are electromagnetic magnets 3A
In the 3D excitation state, the knife hooks 19 and 20 at the left movement position
Hooks 23 and 24 operatively connected to the heald frame 1
Is engaged with the knife hooks 19, 20.
That is, when the electromagnetic magnets 3A to 3D are in the demagnetized state, the dobby driving mechanisms 2A to 2D hold the heald frames 1A to 1D at one of the upper and lower positions, and the electromagnetic magnets 3A to 3D
Are excited, the dobby drive mechanisms 2A to 2D switch the vertical positions of the heald frames 1A to 1D.

FIG. 2E shows a power supply terminal, and ammeters 25A, 25B, 25C, 25D are interposed on the energizing circuits La, Lb, Lc, Ld of the respective electromagnetic magnets 3A to 3D. The upper current value detected by .about.25D is sent to the patterning control computer C. The transistors 26A, 26B, 26 on each of the energizing circuits La to Ld
Reference numerals C and 26D are used to turn on and off the current supply circuits La to Ld. The ON / OFF control of the transistors 26A to 26D is performed by a patterning control computer C. The patterning control computer C reads a set pattern pattern in response to a reference signal obtained from the rotary encoder 5 every one rotation of the machine, and performs ON-OFF control of the transistors 26A to 26D based on the read information.

Reference numerals 27A, 27B, 27C, and 27D denote surge killers including diodes and resistors. FIG.
Curve D ₁ in the graph of represents the swing timing of the selector lever 8, the curve D ₂ are electromagnets (e.g. 3
A) shows the excitation / demagnetization timing, that is, the set pattern pattern.
Therefore, if the attraction between the electromagnetic magnet 3A and the selector lever 8 is performed properly, the actual
Position switching is represented by the curve D _3.

[0015] Electromagnetic when the selector lever 8 as shown by curve D ₄ despite the electromagnet 3A is excited is shifted to the non-suction position from the suction position magnet 3
The magnetic capacity at A changes, and an electromotive force is generated. Accordingly, the current fluctuation D ₅₁ occurs on the curve D ₅ representing a current value detected by the ammeter 25A. Electromagnetic magnet 3
When A shifts from the excited state to the demagnetized state, the selector lever 8 shifts to the non-sucking position, and the magnetic capacity of the electromagnetic magnet 3A changes. Accordingly, although on the curve D ₅ should current variation occurs corresponding to the magnetic change, when the selector lever 8 is not shifted to the non-suction position from the suction position occurs magnetically capacitance change in electromagnet 3A no current fluctuation is not generated on the curve D _5.

The patterning control computer C calculates the detected current value.
Differential operation is performed and the curve d₆₁Is the current fluctuation D₅₁Fine
Minute value, curve d₆₂Is the differential value and curve of the current fluctuation at the start of energization
d₆₃Represents the differential value of the current fluctuation at the time of stopping the energization. That is,
If the minute value is not zero, the presence of the current fluctuation is grasped. Patterning system
Computer C is in a predetermined angle range during one rotation of the machine
[Θ ₁, Θ_Two] Indicates whether there is a current fluctuation, that is, whether there is a change in magnetic capacity.
Has been detected. Electromagnetic magnet 3A and selector lever
Magnetic capacity detected if no adsorption abnormality occurs between the magnetic capacity
The change pattern is the set magnetic capacity corresponding to the set pattern
Match the change pattern. Design control computer C
Detected magnetic capacitance change pattern and set magnetic capacitance change pattern
And the curve d₆₁The derivative of
If the differential value cannot be obtained after stopping the energization,
Judge as abnormal.

According to the method of detecting a change in the magnetic capacity, it is possible to reliably grasp the suction abnormality which causes one of the abnormal positions of the heald frames 1A to 1D. In addition, the installation position of the ammeters 25A to 25D serving as the magnetic capacitance change detector is
Any position on a to Ld is sufficient, and the degree of freedom in installation is extremely high. FIG. 5 shows a set pattern displayed on the display device 6, and 1A to 1D show heald frames. The numbers (1 to 0) in the PIC column indicate the weft insertion order, and the other 0 and 1 indicate the vertical positions of the heald frames 1A to 1D. That is, the displayed set pattern is repeated in units of 14 weft insertions. When grasping the suction abnormality, the patterning control computer C blinks the corresponding vertical position display field of the heald frame 1A as shown by hatching in FIG. Such an abnormal display can identify the electromagnetic magnet that has caused the adsorption abnormality, and can easily cope with the cause of the adsorption abnormality.

As means for detecting a change in magnetic capacity, a comparator 28A, as shown in FIG.
28B, 28C and 28D can also be used. Compa
Correlator 28A~28D compares the detected voltage with the reference voltage, the control computer C Shi output pattern comparator 28A~
The presence or absence of a change in magnetic capacitance is determined based on the presence or absence of a signal from 28D.

[0019]

[0020]

As described above in detail, according to the present invention, the abnormal adsorption between the mechanical drive system of the dobby drive mechanism and the electromagnetic magnet is detected by detecting the change in the magnetic capacity.
The heald frame is not restricted by the installation space of the detector.
This provides an excellent effect that it is possible to accurately grasp the electromagnetic magnet adsorption abnormality that causes the vertical position abnormality .

[0021]

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a dobby opening device and an electronic dobby device.

FIG. 2 is an electric circuit diagram of the electronic dobby device according to one embodiment of the present invention.

FIG. 3 is a side view showing the internal structure of the dobby driving mechanism.

FIG. 4 is a graph illustrating a relationship between a set pattern pattern and a change in detected magnetic capacitance.

FIG. 5 is a screen view showing a set pattern displayed on the display device.

FIG. 6 is an electric circuit diagram showing another example of magnetic capacitance change detection.

[Description of References] 3A, 3B, 3C, 3D: Electromagnetic magnets constituting an electric drive system, 4: Input setting device, 8: Selector levers constituting a mechanical drive system, 28A, 28B, 28C, 28
D: ammeter serving as a magnetic capacitance change detector; 29: photoelectric sensor; L: energizing circuit; C: patterning control computer.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D03C 1/14

Claims (1)

(57) [Claims] 1. A selector lever for an electromagnetic magnet constituting an electric drive system for individually driving the opening of a plurality of heald frames.
In dobby device controlled by adsorption and non-adsorption chromatography, stores the handle pattern, and pattern-alignment control means for instructing the demagnetization of the electromagnet based on the reading of the memorized pattern pattern, energization of the electromagnet a magnetic capacitance change detection <br/> can detect an electrical change based on a change of the magnetic capacitor that is interposed on the circuit, it detects the magnetic capacitance change obtained from the magnetic capacitance change detector
Varying settings magnetic capacity obtained from the design pattern and pattern
To the electromagnetic magnet based on comparison with the
Heddle frame up and down due to abnormal suction of selector lever
A heald frame position detecting device in a dobby device of a loom, wherein a function of determining a normal state is provided to the patterning control means.