JPH027894Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in thread cutting scissors for cutting weft threads woven by a loom.

[Outline of idea]

As a means for constantly pressing the fixed blade against the movable blade, the fixed blade is fixed to the free end of a leaf spring whose one end is fixed to the end face of the bearing block via a shim washer, thereby simplifying the structure. By moving the contact point of the movable blade with respect to the fixed blade, the leaf spring swings based on the shim washer, thereby avoiding excessive frictional contact between the two blades.

[Conventional technology]

As this type of thread cutting scissors, there is a conventional technique disclosed in Japanese Utility Model Application Publication No. 59-145583.

In this technology, a fixed blade (blade plate) is attached to the end face of a bearing block (support stand) via a leaf spring, and a movable blade is attached to the tip of the swing shaft via a leaf spring, allowing the swing of the swing shaft to move. As it rotates, both blades slide toward each other and move away from each other to perform thread cutting work.

[Problem that the invention attempts to solve]

However, with this structure, friction occurs over the entire surface at the sliding contact position due to the biasing pressure between the leaf springs, resulting in significant wear and tear on the blade. Therefore, the thread cutting speed using scissors of this structure is limited, and the replacement period is also relatively short. Furthermore, this structure also requires means for adjusting the spring pressure of the leaf spring, making the structure complicated.

The purpose of the present invention is to prevent premature wear of the blade due to excessive contact as described above, to improve the working speed, and to simplify the structure.

[Means for solving problems]

In order to achieve the above object, the present invention includes a swinging shaft pivotally supported by a bearing block, a fixed blade fixed to the end face of the bearing block, and a swinging shaft fixed to the tip of the swinging shaft at the tip position of the fixed blade. In the thread cutting scissors equipped with a movable blade that slides into and out of contact with the fixed blade by the oscillating motion of a moving shaft, one end of a leaf spring is fixed to the end face of the bearing block via a shim washer, and the free end of the leaf spring is fixed to the end face of the bearing block through a shim washer. The base end of the fixed blade is attached to the blade.

[Effect]

During operation, by moving the contact point of the movable blade with respect to the fixed blade, the fixed side leaf spring swings based on the shim washers, thereby avoiding excessive frictional contact between the two blades.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

Figure 1 is an exploded view of the thread cutting scissors according to the present invention;
Figure 2 is a half-sectional side view in the same assembled state;
The figure is a front view of the same, and FIG. 4 is a plan view of the main part.

The thread cutting scissors in each figure include a bearing block 1,
It is generally composed of a swing shaft 2 supported by a bearing block 1, a fixed blade 3 fixed to the tip of the bearing block 1, and a movable blade 4 attached to the tip of the swing shaft 2.

Oil seals 5, 5 are fitted in front and rear of the shaft hole of the bearing block 1, and each oil seal 5,
A pair of radial ball bearings 6, 6 are arranged inside the spacer 5 with a spacer ring 7 in between. The swing shaft 2 is inserted through the inner periphery of each oil seal 5, 5, the inner ring of the bearing 6, 6, and the inner periphery of the ring 7, and is rotatably supported by the bearing block 1 in a sealed state.

At the tip of the swing shaft 2, there are flanges 2a, 2.
b is formed in two stages, and has a rear flange 2b in contact with the tip surface of the oil seal 5, and a screw 2c is cut in the rear protruding end of the swing shaft 2 from the bearing block 1. A pair of lock nuts 8, 8 are screwed onto the screw 2c. Each lock nut 8 restricts the movement of the swing shaft 2 in the thrust direction, and is double tightened to prevent loosening.Furthermore, the set screw S is screwed in from the end face of the rear lock nut 8 to complete the lock. It is used as a wall.

Further, a movable plate spring 9 is attached to the end face of the tip flange 2a of the swing shaft 2 with a countersunk screw 10, and the movable blade 4 can be replaced with a countersunk screw 11 at the swinging tip of the movable plate spring 9. It is installed on.

Opposed to the movable blade 4, the fixed blade leaf spring 1 is inserted into the front end surface of the bearing block 1 with the swing shaft 2 inserted therein.
One end of the fixed blade 3 is fixed by a panhead machine screw 13, and the base end of the fixed blade 3 is exchangeably attached to the free end of the fixed blade plate spring 12 by a countersunk screw 14.

Further, a shim washer 15 is interposed on the outer periphery of the machine screw 13, and holds one end of the fixed blade leaf spring 12 at a predetermined distance d from the end surface of the bearing block 1.

Both the fixed blade 3 and the movable blade 4 are made of tungsten carbide, a superalloy containing cobalt, or ceramic, and the blade edges 3a, 4a are formed on the plate surface 3.
b, 4b are formed on a plane perpendicular to them. Further, the cutting edge of the movable blade 4 is formed one step thinner. By arranging the blades 3 and 4 diagonally rather than at right angles to the weft supply direction, the protrusion length when cutting the weft can be shortened, but by making the blade edge thinner, the protrusion length of the weft can be shortened. This is because the length can be further shortened, and the integration saving effect is significant.

Therefore, the thread cutting scissors constructed as described above are fixed obliquely to the side of the loom, and the movable blade 4 is rotated by swinging the swing shaft 2 in synchronization with the operation of the loom.
The supplied weft is cut at high speed while the blade edge 4a of the fixed blade 3 is brought into sliding contact with and separated from the blade edge 3a of the fixed blade 3.

Due to this movement, the contact point of the blade edge 4a of the movable blade 4 with the fixed blade 3 moves back and forth, but the fixed blade 3
The leaf spring 12 supporting the blade swings around the shim washer 15 as the contact point moves, and as a result, excessive frictional contact between the two blades 3 and 4 can be avoided.

In addition, since the swing shaft 2 constantly biases the movable blade 4 toward the side that presses the fixed blade 3 due to the double nut effect of the lock nuts 8, 8, there is no gap between the two blades 3, 4 in the biting state. Can maintain good sharpness.

[Effect of idea]

As explained in detail in the embodiments above, in the present invention, compared to thread cutting scissors of conventional structure, the leaf spring swings around the shim washer as the contact point of the movable blade with respect to the fixed blade moves. Therefore, excessive frictional contact can be avoided while maintaining good sharpness of both blades. Therefore, in the present invention, the movable blade and the fixed blade are less worn out, the replacement period can be extended, and the thread cutting work speed can be greatly improved.

In addition, compared to conventional thread cutting scissors, the present invention does not require a means for adjusting the frictional force between the movable blade and the fixed blade.
The structure becomes simple.

Further, when a double nut is screwed onto the end of the swing shaft, there is no loosening or play in the axial direction, and high performance can be maintained for a long time.

It is clear from the above description that the above object of the present invention is effectively achieved. Moreover, since changes can be made to the above structure without departing from the spirit and scope of the present invention, all the above descriptions are merely illustrative and should not be construed in any limiting sense.

The scope of the utility model registration claims encompasses all features of the invention and all matters within the scope of the invention that may be omitted due to language problems.

[Brief explanation of the drawing]

Figure 1 is an exploded view of the thread cutting scissors according to the present invention;
Figure 2 is a half-sectional side view in the same assembled state;
The figure is a front view of the same, and FIG. 4 is a plan view of the main part. 1... Bearing block, 2... Swing shaft, 3... Fixed blade, 4... Movable blade, 8... Lock nut (double nut), 12... Fixed blade leaf spring, 15... Shim washer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A swing shaft pivotally supported by a bearing block, a fixed blade fixed to the end face of the bearing block, and a swing shaft fixed to the swing shaft tip at the tip position of the fixed blade. In the thread cutting scissors equipped with a movable blade that slides into and out of contact with the fixed blade by the oscillating motion of a moving shaft, one end of a leaf spring is fixed to the end face of the bearing block via a shim washer, and the free end of the leaf spring is fixed to the end face of the bearing block through a shim washer. A thread cutting scissor characterized in that the base end of the fixed blade is attached to the base end of the fixed blade. (2) A utility model according to claim 1, characterized in that a double nut for regulating axial movement of the swing shaft is screwed onto the outer periphery of the rear protruding end of the swing shaft from the bearing block. Scissors for thread cutting.