JPH0638132Y2 - Weft cutting device for loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a weft cutting device in a loom.

(Prior Art) A mechanical drive system by a cam mechanism as a cutting device for cutting and separating the weft yarn injected from the main nozzle for weft insertion from the cloth fell side for each beating, and for example, Japanese Utility Model Publication No. Sho 61-82979 There is an electric drive system such as an air cylinder or an electromagnetic solenoid that is operated based on an electric drive signal as disclosed in Japanese Utility Model Laid-Open No. 57-196181. The electric drive method is advantageous in the miss yarn processing method in which the weft insertion of the following weft yarn is prevented without cutting and separating the weft yarn and the following weft yarn, and the miss yarn is pulled out and removed from the warp opening by using the following weft yarn as a clue. . Moreover, with the electrically driven weft cutting device, setting of the weft cutting timing is much easier than with the mechanical drive method, and it is possible to follow the speedup of the loom while suppressing mechanical damage as much as possible. Is.

(Problems to be solved by the invention) However, in the electric drive type weft cutting device used on the premise of such an advantage, a spring action is conventionally used for returning after the cutting operation, and therefore, The rising performance of the cutting operation of the movable blade is greatly affected by the opposing setting of the action force of the return spring and the driving force of the movable blade, but the load factor of the movable blade and the acting spring pressure are also considered in this opposing setting. It is very troublesome to do. Moreover, if the action force of the return spring is reduced to simply improve the rising performance of the cutting operation, the return speed of the movable blade will be significantly delayed compared to the startup speed, and the smoothness of operation of the movable blade required to increase the speed of the loom will be impaired. Be done.

SUMMARY OF THE INVENTION In view of the above, in the present invention, the reciprocating drive means operated based on a predetermined electric drive signal includes an air cylinder and a spring whose operating force is adjustable, and The movable blade is operatively connected to the movable blade for cutting the weft, and the movable blade is fixed on a support shaft rotatably supported, and the total center of gravity of the movable blade and other members connected and fixed on the support shaft is determined. It is set on the support shaft.

(Operation) That is, in setting the rising property of the cutting operation of the movable blade and the rising property of the returning operation, not only the center of gravity load factor of the movable blade can be taken into consideration, but also
Since the acting spring pressure can be adjusted, it is possible to set the cutting speed and the returning operation of the movable blade to be smooth while achieving high-speed driving of the movable blade. Therefore, the movable blade rises at a high speed, and the cutting and opening / closing operation thereof is smoothly performed.

Embodiment An embodiment embodying the present invention will be described below with reference to FIG.

The weft insertion main nozzle 2 on the sley 1 is directed toward the weft insertion passage 3a in front of the deformed reed 3 standing on the sley 1,
The weft yarn Y ejected from the weft-insertion main nozzle 2 is relayed in the weft-insertion passage 3a by a plurality of weft-insertion auxiliary nozzles 4 mounted on the sley 1 at predetermined intervals.

A support bracket 5 is fixed to the side of the cloth fell W1 of the woven cloth W on the side of the loom frame, and a support shaft 6 is rotatably supported at the tip of the support bracket 5. Support bracket 5
A fixed blade 7 is fixedly mounted on the side surface of the woven cloth W side, a movable blade 8 is fixed to one end of the support shaft 6 on the woven cloth W side, and a lever 9 is attached to the bolt 10 at the other end. It is fixed by tightening. That is, the movable blade 8, the lever 9 and the bolt 10 are integrally connected and fixed via the support shaft 6, and the center of gravity of all of these members 8.9.10 is set on the support shaft 6.

An air cylinder 11 is attached to the side surface of the support bracket 5 just below one end of the lever 9,
Is connected to a compressed air supply source via an electromagnetic three-way valve (not shown). Piston 11 housed in air cylinder 11
At the protruding end of the piston rod 11b of a, adjust bolt
12 is screwed on and fixed by a nut 13. A pressing bracket 14 is arranged and fixed immediately above one end of the lever 9, and a pressing spring 15 is interposed between a supporting recess 14a at the tip of the pressing bracket 14 and a supporting recess 9a on one end of the lever 9. ing.

Now, the weft Y injected into the weft inserting passage 3a is introduced into the beating operation between the fixed blade 7 and the movable blade 8 and is subjected to a cutting action substantially at the same time as the beating operation. The rotating operation of the movable blade 8 is performed based on the air supply command signal to the electromagnetic three-way valve, and the lever 9, the bolt 10 and the movable blade 8 center the support shaft 6 against the pressing spring 15 by the supply of compressed air. Is rotated to. The returning operation of the lever 9, the bolt 10 and the movable blade 8 is performed based on the air discharge command signal to the electromagnetic three-way valve, and the lever 9, the bolt 10 and the movable blade 8 are pivotally returned by the spring action of the pressing spring 15. Since the total center of gravity of the lever 9, the bolt 10 and the movable blade 8 which rotate around the support shaft 6 is set on the support shaft 6, all the load of the center of gravity is received by the support shaft 6 and compressed air pressure and There is no center of gravity load element that affects the spring action of the pressure spring 15. Therefore, the compressed air action force for obtaining a smooth and high-speed response to the compressed air supply command and the discharge command while balancing the cutting rotation operation speed of the lever 9, the bolt 10, and the movable blade 8 and the return operation speed thereof. Also, it becomes easy to set the spring action force of the pressing spring 15 with high precision, and to achieve high-speed driving of the movable blade excellent in the rising characteristics of the cutting and rotating operation and the falling characteristics of the returning operation, which is commensurate with the speedup of the loom. You can

By adjusting the screwing position of the adjusting bolt 12, the acting force of the pressing spring 15 on the lever 9 can be adjusted appropriately.

Of course, the present invention is not limited to the above-described embodiment, and for example, as shown in FIG. 2, the spring bearing 16 is slidably fitted and accommodated in the supporting recess 14a of the pressing bracket 14, and the spring bearing 16 is secured by the bolt 17. It is also possible to appropriately adjust the support position of, or to integrally form the movable blade and the lever and set the center of gravity thereof on the support shaft 6. Further, as a reciprocating drive means actuated by a predetermined electric drive signal, an electromagnetic solenoid is used other than a combination of an electromagnetic valve and an air cylinder, or a pair of opposing air cylinders or electromagnetic solenoids are used to cut the movable blade. An embodiment in which the movement and the return thereof are performed is also possible.
Furthermore, the present invention is applied to a weft cutting device that cuts and separates the following weft from the main nozzle for weft insertion in a weft processing device that pulls out and removes the miss yarn in the warp opening by using the weft yarn following the weft insertion error as a clue. It is also possible to do so.

Effects of the Invention As described in detail above, the present invention sets the total center of gravity of the movable blade rotatably supported on the support shaft and other members integrally connected to the movable blade on the support shaft, and Since the acting spring pressure can be adjusted, the rising and falling characteristics of the cutting and rotating operation can be set without considering the center of gravity load element on the movable blade side, and the cutting and returning operations of the movable blade are possible. The excellent effect that the movable blade can be driven at high speed while achieving the smoothness of

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment embodying the present invention, and FIG. 2 is a side sectional view showing another embodiment. A support shaft 6, a movable blade 8, a lever 9 and a bolt 10 which rotate integrally with the movable blade 8, an air cylinder 11 and a pressing spring 15 which constitute a reciprocating drive means.

Claims (1)

[Scope of utility model registration request] 1. A reciprocating drive means that is operated based on a predetermined electric drive signal includes an air cylinder and a spring whose operating force is adjustable, and is operatively connected to a weft cutting movable blade and is rotatably supported. The weft cutting device in a loom, wherein the movable blade is fixed on the supported shaft, and the total center of gravity of the movable blade and the other member connected and fixed on the support shaft is set on the supported shaft.