JPH02160948A - Rapier - Google Patents

Abstract

PURPOSE:To obtain a rapier capable of performing a weft-insertion of a foil yarn without inversion by providing a stationary gripping member for performing weft- insertion of a foil yarn, forming a vertically extended space having a width larger than a half of the width of the foil yarn at the upper half of the innermost part of the yarn gripping wall face of the stationary gripping member and chamfering the top of the space to form a space having a width larger than the width of the foil yarn. CONSTITUTION:The objective gripping-type rapier 1 for inserting a foil yarn as a weft is obtained by providing a stationary gripping member 2 having a vertically extended space 4 having a width larger than 1/2 of the width of the foil yarn on at least the upper half of the innermost part of the yarn-gripping wall face 20 of the stationary gripping member 2, chamfering the top of the yarn-gripping side wall face 20 of the stationary gripping member to form a space 5 having a width larger than the width of the foil yarn, providing a mobile gripping member gripping a foil yarn between the stationary gripping member and the mobile member by the force of a spring and chamfering the top of a yarn-gripping side wall face 30 of the mobile gripping member 3 to form a space 6 having a width larger than the width of the foil yarn. The weft-insertion of a foil yarn can be carried out without causing the inversion of the foil yarn during insertion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gripping type rapier for inserting cut foil or foil yarn (both patterned and plain).

It is desirable that the foil yarn be inserted without turning over halfway through. If the foil thread is turned inside out during weft insertion, whether patterned or plain, if the foil thread is reversible, it will cause weaving flaws due to the folding of the inside out.
Similar weaving flaws overlap with missing patterns, hues, or luster spots due to turning inside out.

Conventional techniques and their problems Conventionally, it has not yet been established that a gripping type rapier can insert a foil yarn without turning it over midway through weft insertion. This is because the rapier used to insert threads other than foil threads is used as is for inserting foil threads. The details are as follows.

The speed of the weft insertion motion of the rapier is not constant, but is a sine curve, and in order to insert the foil yarn without any trouble, the withdrawal of the foil yarn accompanying the weft insertion must correspond to this sine curve. Conventionally, as a countermeasure against this problem, the foil yarn is pulled out from the foil yarn tube at a fixed position in the axial direction of the tube yarn, and under this pulling mode, resistance is applied to the pulling out of the foil yarn so as to correspond almost immediately to the above-mentioned sine curve. In this way, the inserted foil yarn is twisted in order to be pulled out in the above-mentioned manner, and often turns inside out during weft insertion.

Conventionally, foil threads were given a reverse twist each time they were inserted in order to eliminate the twist caused by inserting the weft, but even then, some turning over occurred during weft insertion. This is due to the following reason.

The grasping type rapier has a fixed gripping body and a movable gripping body whose thread gripping surfaces extend in a vertical plane, and a foil thread herepia head which is waiting with its front and back surfaces extending perpendicularly to the vertical plane along the rapier axis. By moving forward and then retreating, the foil thread is held between the thread gripping surfaces of both the gripping bodies. As a result, the gripped portion of the foil thread is twisted 90° around its axis. The direction of this "twist" is uncertain due to various factors. Moreover, with conventional gripping rapiers, there is no guarantee that the foil yarn will be properly "twisted" each time the weft is inserted. That is, in the conventional gripping type rapier, the perpendicular surface following the thread gripping surface of the fixed gripping body extends substantially to the front inner end surface of the rapier head, and it substantially extends to the upper surface of the rapier head. When gripping a foil thread between the body and the thread gripping surface of the movable gripper, the part of the foil thread other than the gripped part comes into contact with the thread gripping side wall surface of the fixed gripper due to the "twist". In addition to the direction of the movement, aspects other than the direction are also forced to become uncertain. For this reason, in conventional grasping rapiers, by arranging the foil yarn tube yarn so that its axis is perpendicular to the rapier, the foil yarn is not heated during weft insertion. Even if a suitable degree of tension is applied, it is impossible to avoid turning the foil yarn inside out during weft insertion.

An object of the present invention is to provide a rapier that ensures weft insertion of foil yarn without turning it over midway.

Means for Solving the Problems The above objects of the present invention are achieved by a rapier having the following configuration.

A grasping type rapier for inserting foil threads, which extends vertically by at least 1/2 of the foil thread width on at least the upper half of the inner end of the thread gripping side wall surface of the fixed gripping body of the rapier. A rapier characterized in that the upper side of the thread gripping side wall surface of the fixed gripping body is chamfered to form a void space larger than the width of the foil thread.

In the present invention, the upper side of the thread gripping side wall surface of the movable gripping body of the rapier is also chamfered to form a void space larger than the width of the foil thread, and/or when the rapier reaches its forward limit. , it is preferable to include steady rest means for preventing the tip of the rapier from swinging.

Function In the present invention, the upper side wall surface of the thread gripping side of the fixed gripping body is chamfered to form a space larger than the width of the foil thread, so that the foil thread can be moved between the fixed gripping body and the movable gripping body. When gripped between them, the portion twisted by 90° around the axis of the foil thread does not come into contact with the thread gripping side wall surface of the fixed gripping body, except for the gripped portion. For this reason, the foil yarn is twisted appropriately when it is gripped each time the weft is inserted. If a chamfer is applied to the upper side of the thread gripping side wall surface of the movable gripping body to form a space larger than the width of the foil thread, the part where the foil thread is twisted will be on the thread gripping side wall surface of the movable gripping body. Also, there is no contact except for the gripped portion, and the suitability of twisting of the foil thread during gripping is improved.

In the present invention, by providing at least the upper half of the back end of the thread gripping side wall surface of the fixed gripping body with a space extending vertically and having a size of 1/2 or more of the foil thread width, the following results are brought about. .

At the moment when the gripped foil yarn is pulled by the rerapier for weft insertion, a dynamic load is applied to a region extending backward from the gripped portion, and as a result it vibrates, albeit slightly. The voids help to cope with this vibration of the foil yarn. That is, the foil thread is prevented from hitting the inner end of the thread gripping side wall surface of the fixed gripping body and being reversed due to the vibration.

When the rapier reaches its forward limit, if a steadying means is provided to prevent the tip of the rapier from swinging, the nip points of the fixed gripping body and the movable gripping body will not shift, and the The suitability of twisting and/or the certainty of avoiding reversal is improved.

Effects of the Invention As described above, according to the present invention, the twisting of the foil yarn when gripping is done appropriately for convenience of weft insertion, and when the foil yarn is pulled by a rapier, the foil yarn is twisted at the back of the wall surface of the thread gripping side of the fixed gripping body. Since no reversal occurs in the portion corresponding to the end, it is possible to arrange the rolled foil yarn, such as a tube yarn, so that its axis is perpendicular to the rapier, and to apply appropriate tension to the foil yarn during weft insertion. This ensures that the gripping rapier inserts the foil yarn without turning it inside out.

Example Next, embodiments of the present invention will be described with reference to the accompanying drawings.

A grip-type rapier (1
) is a fixed gripper (2) formed at the tip of the rapier (1).
, and a movable gripper (3) which clamps the foil yarn between the gripper (2) and the gripper (2) under spring bias (FIG. 1). In Figure 1, the lower side is the woven fabric side.

Thread gripping side wall surface (20
) at least the upper half of the rear end (left end in Figure 1) is a space (4) extending vertically. This void space (4) has a size of 1/2 or more of the width of the foil thread (planar spread), and more preferably a size slightly larger than the width of the foil thread. Blank space (4
) should be rounded. In angular spaces, the side edges of the foil threads may be scratched. The fixed grip body (2)
The upper side of the thread gripping side wall surface (20) is chamfered to a predetermined degree, thereby making the upper side a void space (5) having a size equal to or larger than the width of the foil thread.

The upper side of the yarn gripping side wall surface (30) of the movable gripper (3) is also chamfered to a predetermined degree, and the upper side is made into a void (6) having a size equal to or larger than the width of the foil yarn.

The grooves on the thread gripping surfaces of the grippers (2) and (3) are shown in an exaggerated manner for convenience of drawing.

When the rapier (1) reaches its forward limit, the rapier (1)
A steady rest means (7) is provided to prevent the tip of the machine from swinging. This steady rest means (7) has wall surfaces (70a) (70a) with which the left and right (top and bottom in FIG. 1) outer surfaces of the tip of the rapier (1) come into contact when the rapier (1) reaches its forward limit. A preferred example is a member (70) and a flexible sheet (71) made of leather or the like that is in contact with the lower surface of the tip of the rapier (1). This embodiment of steady rest means is shown in FIG. In FIG. 3, (8) shows a member to which members (70) and (71) of the steady rest means (7) are attached.

The arrangement of the foil yarn to be inserted with the rapier of the present invention, the pulling out, and the application of tension during weft insertion can be carried out in an appropriate manner, for example, in the fourth
The embodiment shown in the figure (elevation view) may be applied. The embodiment of FIG. 4 has the following format.

The foil thread is arranged in the form of a long winding (A), for example in the form of a tube thread, in such a position that its axis is perpendicular to the rapier (1).

The foil yarn is passed from the long winding material (A) to the ring-shaped yarn path (9) at a fixed position.
), pinch delivery roll (10) and tubular yarn guide (11)
The end of the thread is then held at a predetermined position in the desired position. The amount of feed from the pinch roll (10) is slightly smaller than the amount of foil yarn pulled out during weft insertion by the rapier (1). In Fig. 4, the thread guide (9) is shown in a perspective view for the sake of easy understanding, but its installation is such that the surface that matches the inner space of the thread guide crosses the drawn foil thread. This is an aspect corresponding to .

A weight plate (12) for removing slack in the foil yarn is suspended between the pinch feed roll (10) and the yarn guide (11). The weight plate (12) has a reflective surface on the required side. In addition, the chain plates are placed in opposing guide grooves (not shown) extending in the vertical direction on the left and right (in the front and back directions of the paper in FIG. 4).
The side edges are fitted and the vertical movement is guided by the weight.

A sensor (13) that captures the reflected light from the reflective surface is arranged at a fixed position on the side of the weight plate (12) corresponding to the reflective surface. The sensor (13) is electrically or electronically connected to a drive device (not shown) such as a motor for the pinch delivery roll (10).

The weight plate (12) is in the standby state of the foil yarn and occupies a lowered position due to its weight, and the sensor (13) faces the reflective surface of the weight plate (12). In the standby state, the tip of the foil thread is held in position by a clamp (not shown) associated with a mechanically driven scissor (14) [schematically shown in the block diagram] for the foil thread. Releasably clamped.

A thread path (15) having a groove for guiding the threading of the foil thread on the upper surface and a protruding body extending upward is disposed at a location slightly downstream of the location of the scissors (14) in terms of pulling out the foil thread, The thread travel of the foil thread at this location is regulated by the thread guide (15).

A movable presser foot (16) and a fixed presser foot (17) are arranged between the thread path (15) and the yarn path (11) in front of it. The movable presser foot (16) presses the foil yarn until the forward motion approaches or reaches the forward limit when the rapier (1) is at rest and when the rapier (1) moves forward.
), the restraint is released when the rapier (1) approaches or reaches the advance limit, and the release is continued during the weft insertion movement of the rapier (1). Suppression and release of the presser foot (15) at predetermined times may be performed via an interlocking mechanism by actuating an appropriate moving member of the system that reciprocates the rapier (1).

The rapier (1) is attached to the foil thread (A1) extending diagonally downward from the thread path (15) to the clamp of the scissors (14).
The rapier head moves forward and then back to grip the foil thread.

When the weight plate (12) is raised due to the accompanying increase in the tension of the foil thread at the beginning of drawing out the foil thread by the rapier (1),
When the weight plate (12) occupies a position above the sensor (13), the sensor (13) detects this, and based on this, the pinch delivery roll (10) is driven to send out the foil yarn. Since this amount of feeding is slightly less than the amount of foil yarn being pulled out by the rapier (1), the foil yarn being inserted maintains a predetermined pulling tension.

After the rapier (1) finishes drawing out the foil thread, the foil thread long winding material (A) rotates due to the inertia of drawing out the foil thread so far, and the brake is used to prevent the foil thread from being paid out. (not shown) is provided. The brake is left inactive when the pinch delivery roll (10) is driven. The deactivation control may be performed by retracting the brake shoe at a predetermined time using a solenoid.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is a sectional view taken along the line in FIGS. FIG. 4 is an elevational view showing an example of the arrangement, bowing, and tensioning of the foil yarn inserted by the rapier of the present invention, together with an outline of the rapier. (1)... Rapier (2)... Fixed grip (3)... Movable grip (4) (5) (6)... Vacant space (7)... Steady rest means (9 )(11)(15)...Thread path (10)...Pinch feed roll (12)...Weight plate (13)...Sensor for detecting weight plate (16)...
Movable presser foot (17)... Fixed presser foot (20)... Grasping side wall surface (30) of fixed gripping body...
Grasping side wall surface of movable gripping body (A)...Long roll of foil yarn (or more)

Claims (3)

[Claims] (1) A grasping type rapier for inserting foil threads, in which at least the upper half of the inner end of the thread gripping side wall surface of the fixed gripping body of the rapier is inserted into the foil thread with a size of 1/2 or more of the width of the foil thread. A rapier characterized in that the space extends vertically, and the upper side of the thread gripping side wall surface of the fixed gripping body is chamfered to form a space larger than the width of the foil thread. (2) A claim (
1) The rapier described. (3) The rapier according to claim 1 or 2, further comprising a steadying means for preventing the tip of the rapier from swinging when the rapier reaches its forward limit.