JPS6114265B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foil yarn transfer machine for performing weft insertion work of foil yarns.

In the weft insertion work of the foil yarn, with the beating movement of the loom temporarily stopped, a single foil yarn is sent by a foil yarn transfer machine to a weft guiding spatula installed in the reed, and the weft thread is inserted into the shuttle of the spatula. It is pulled into the shed by moving in the direction of travel, and driven in by resuming the beating motion.

This invention provides a method for transferring a special weft yarn such as a foil yarn to a weft guiding spatula installed in a reed by a foil yarn transfer machine, without increasing the speed at the start and just before the end of the transfer. By increasing only the speed, the impact in the yarn transfer process is reduced and the yarn transfer efficiency is improved.

Conventionally, when the drive lever was actuated by connecting a rod directly to the drive crank pin, the speed at the start and just before the end would drop to some extent, depending on the characteristics of the crank motion, and increase to a certain degree in the middle. However, it is not possible to specifically increase the speed only at the intermediate position, but in this invention, it is possible to smoothly increase only the speed at the intermediate position without increasing the impact at the time of starting and just before ending. It seeks to achieve that purpose.

This invention will be explained in detail based on examples.

A thread picker 2 for picking the foil thread 1 is provided on a rotating arm 15 fixed to a rotating shaft 14 disposed in the longitudinal direction of the loom. In the state where the rotating arm 15 is upright,
After the thread picker 2 has picked up the foil thread 1, the rotating shaft 14 is rotated.
When the rotating arm 15 is tilted toward the loom by rotating rightward (or leftward) for 1/4 turn, the foil yarn 1 is pivoted about the rotating shaft 14, and the rotating arm 15 is tilted at a right angle. When you do this, the tip of the foil thread (lower end)
is in the vertical direction and is fed into the thread guide hole 4 of the weft guide spatula 3, and the thread picker 2
When the thread knob is released, the thread is transferred to the spatula 3. After this foil thread transfer, the rotating shaft 14 is
The rotating arm 15 is rotated in the opposite direction to the above for 1/4 turn.
is returned to the standing state and the next foil thread 1 is picked.

The rotary shaft 14 is connected to the drive rod 9 through a rod transmission mechanism, so that the reciprocating motion of the drive rod 9 causes the rotary shaft 14 to repeatedly rotate. It is given as stated.

A crank pin 6 provided eccentrically on a rotating disk 17 fixed to a rotating main shaft E forms a swinging lever 7 that is swingably provided with a point a suitable distance away from the center of rotation of the crank pin 6 as a fulcrum C. long hole 8
There is a structure in which a drive rod 9 is pivotally connected to the swing lever 7 in a manner that it can be slidably engaged with the swing lever 7. Rod 9 is designed to move back and forth.

The reciprocating movement of the drive rod 9 is achieved by the L-shaped lever 10, the rod 12, and the rod 1 fixed to the rotating shaft 14.
6, and is converted into a repetitive rotational motion of the rotary shaft 14. In the figure, 5 indicates a drive motor, and 13 indicates a power transmission belt.

As shown in FIG. 2, the crank pin 6 rotates, and the crank pin 6 is positioned between the fulcrum C of the swing lever 7 and the main rotation shaft E, and the crank pin 6 is positioned between the fulcrum C of the swing lever 7 and the crank pin 6. When the main axis of rotation E is aligned on the same line, the operating speed of the drive rod 9 increases as shown in the proportional equation described later, and the foil yarn 1 is rapidly transferred.

That is, the pivot connection point between the drive rod 9 and the swing lever 7 is expressed as D, the distance between the pivot connection point D and the fulcrum C of the swing lever 7 is expressed as CD, and the distance between the crank pin 6 and the swing lever 7 is expressed as CD. If the distance from the fulcrum C is represented by C6, the speed of the drive rod 9 will be considerably faster than the speed of the crank pin 6 at the ratio of the proportional equation CD/C6 (CD>C6).

Next, as shown in FIG. 3, the crank pin 6 further rotates, and the rotation main shaft E is located between the fulcrum C of the swing lever 7 and the crank pin 6, and the swing lever 7
When the fulcrum C, the rotational main shaft E, and the crank pin 6 are aligned on the same line, the operating speed of the drive lever 10 becomes slower as expressed by the proportional expression CD/C6 (CD<C6).

Further, to explain this in terms of one revolution of the crankshaft, as shown in Fig. 4, if the yarn transfer start point is A and the yarn transfer end point is B, the rotation angle of the foil yarn transfer stroke of the rotating main shaft E is small, and the return The rotation angle of the stroke is large,
It can be seen that the recovery speed is slow.

As a result, when the thread pinching mechanism needs to be temporarily stopped for another operation during its return, the impact on each part due to the midway stop is greatly reduced because the speed at that time is slow.

As is clear from the above explanation, the present invention can minimize shocks and vibrations during the operation process of the mechanism for transferring special weft yarns such as foil yarns, such as when starting, at the end of transfer, and when stopping during return. Since a high speed can be obtained only when transferring the foil yarn, the overall process is very smooth and has the effect of being highly efficient.

[Brief explanation of the drawing]

Fig. 1 is a perspective view, Fig. 2 is a partial front view showing the relative positions in the middle of the thread transfer stroke, Fig. 3 is a partial front view showing the relative positions in the middle of the return stroke; FIG. 4 is a diagram showing the rotation angle of the transfer stroke and the rotation angle of the return stroke in one rotation of the rotating main shaft E. DESCRIPTION OF SYMBOLS 1... Foil thread, 2... Thread picker, 3... Weft thread guiding spatula, 4... Yarn guiding hole, 5... Drive motor, 6... Crank pin, 7... Drive lever, 8... Long hole, 9... Drive rod, 10 ... Drive lever, 11... Other end of drive lever, 12... Rod, 13... Power transmission belt,
14... Rotating shaft, 15... Rotating arm, A... Thread transfer starting point, B... Yarn transfer end point, C... Support point of swing lever,
D... Pivotal connection point between drive rod 9 and swing lever 7, E... Rotating main shaft.

Claims (1)

[Claims] 1. A thread pincher 2 is provided on a rotating arm 15 fixed to a rotating shaft 14 disposed in the longitudinal direction of the loom, and the rotating arm 15
In this foil yarn transfer machine, the crank pin 6 is tilted toward the loom from a standing state, and then returned from the tilted state to the standing state. A swinging lever 7 whose fulcrum C is a point a suitable distance away from the center of rotation is provided,
A foil yarn transfer machine characterized in that the reciprocating motion of a drive rod 9 pivotally connected to the swing lever 7 in a crossing manner is converted into repetitive rotational motion of the rotating shaft 14 by a rod transmission mechanism.