JPH0243907Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluid jet loom that uses an air jet, for example, and particularly relates to a device for pulling back weft threads from the fluid jet nozzle.

[Conventional technology]

In a fluid jet loom, after wefting and beating the yarn, the weft connected to the cloth edge is cut by a cutter placed between the cloth edge and the fluid jet nozzle, so there is no space between the cloth edge and the nozzle tip. Threads will remain.
Especially in the case of mixing in which a plurality of weft yarns are inserted alternately using a plurality of fluid injection nozzles, the weft yarns tend to get entangled with other yarns and cause weft insertion errors.

Therefore, various means for pulling back this residual yarn at the nozzle entrance side have been proposed in the past, such as the nozzle residual yarn pulling device disclosed in Japanese Utility Model Publication No. 59-2145, and the device disclosed in Japanese Patent Publication No. 44-4848. There is a method for pulling back the weft yarn. However, the former device consists of a pull-back lever consisting of a pair of branched arms having a thread guide hole, and two bars provided between the branched arms to engage with the weft as the pull-back lever swings. and the posture of the two bars in a plane perpendicular to the straight running direction of the weft yarn must be adjustable individually, which only makes the configuration extremely complicated. There is no need to pass the weft thread through the thread guide hole, which poses a problem in operability. In addition, in the latter method, a part of the weft is pulled out between two points on the axis of the nozzle, and a loop is formed in the direction of the axis of the nozzle or in a direction very close to it; This is a method of pulling out a single thread, and cannot be applied to a loom that performs mixing as in the present invention.

[Problem that the invention attempts to solve]

Therefore, the conventional multi-color weft pulling device has the following features:
There were problems with the complexity of the configuration and the complexity of operation.

[Means for solving problems]

In order to quickly solve the above-mentioned problems, the present invention includes a pair of grippers and a pair of fluid jet nozzles each receiving a weft from the grippers, and the fluid jet nozzle alternately wefts the weft. In a weft thread pulling back device of a fluid injection type loom for weft insertion, one weft thread hooking part is disposed between the two weft threads and between the gripper and the fluid injection nozzle, and has an outer circumferential surface that engages with the weft threads;
2 connected to the weft thread hooking section for pulling back the weft thread from the fluid jet nozzle through the weft thread hooking section.
and a moving member that moves between two pull-back positions, and when the moving member operates, the weft thread hooking part is selectively moved to the two pull-back positions while catching the weft thread on its outer peripheral surface. It is something.

[Effect]

The weft is pulled back after the weft is cut and until the next weft insertion, and this pulled back state is maintained until the other weft is cut.

That is, when the moving member is operated at a predetermined timing that matches the operation of the loom, one weft thread hooking part between two weft threads first rotates or swings toward one of the pulling back positions, and then At this time, the weft yarn hooking section hooks the weft yarn in the moving direction on the outer circumferential surface and pulls it back from the fluid injection nozzle. When the moving member is further actuated, the weft yarn hooking section rotates or swings toward the other pulling back position, hooks another weft in the moving direction on its outer circumferential surface, and draws it from the fluid injection nozzle. Pull back.

〔Example〕

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In FIG. 1, 3 and 4 are yarn passages 3a and 4.
The yarn guide portions 5 and 6 with a are a gripper and a fluid injection nozzle that operate in synchronization with the operating timing of the loom, and each pair of these members is aligned approximately in a straight line and is placed on, for example, a sled (not shown). It is installed. There are well-known reeds 7, cutters 8, etc. on the tip side of the nozzle 6, which are sprayed from the nozzle 6 (the lower one in Fig. 1) selectively placed at the weft insertion position in a well-known manner and inserted between the warp threads. The weft yarn 9 that has been
The reed 7 is used to reed the material toward the fabric, and the cutter 8 then cuts the material. At this time, as described above, residual yarn is generated on the side of the nozzle used for weft insertion.

According to the invention, between the gripper 5 and the fluid injection nozzle 6, more specifically between the guide parts 3 and 4 and between the two weft threads 9, the weft thread 9 is engaged and hooked. one weft hooking section 2 having an outer circumferential surface 2a; and a plate connected to the weft hooking section 2 and moving the weft hooking section 2 between two pull-back positions for pulling back the weft from the fluid injection nozzle 6. A weft pulling back device is provided, which includes a moving member 1 having a shape.

As best shown in FIG. 2, the weft hooking part 2 is circular with a smooth hooking groove formed on its outer peripheral surface 2a, and is preferably rotatably attached to the tip of the moving member 1 by an appropriate means. It is worn. Moving member 1
The other end is fixed to a shaft or pin 10, and by driving the pin 10 either clockwise or counterclockwise in FIG. 1, or alternately in both directions, with a drive device (not shown). , moving member 1
rotates or oscillates. This drive device may be configured such that its drive source is the same as the drive source of the loom and drives or reduces the movable member 1 in synchronization with the operating timing of the loom, or a separate drive source such as a solenoid may be used to control the moving member 1 at a predetermined timing. The movable member 1 may be driven by the following.

In this embodiment, the weft thread hooking section 2 is arranged substantially on a plane defined by two weft threads, and rotates or swings on the plane. A pin 10 is placed at a position equidistant from the weft 9 of the book so that its axis is parallel to the weft 9, and the weft hooking part 2 on the movable member 1 pivoting around the pin 10 has two It may be arranged on a plane perpendicular to the plane defined by the weft 9 of and swing in the direction of the arrow.

In addition, if you want to change the amount of yarn pulling back, you can change the swing angle α of the moving member 1 as shown in FIG. 4, or change the position of the weft hooking part 2 or the pin 10 as shown in FIG. As shown in FIGS. 6 and 7, a pair of L-shaped arms 11 are fixed to the machine base.
(only one is shown in the figure), the pins 12 may be attached to each of them so that their positions can be adjusted, and the pins 12 may be arranged within the swing radius of the movable member 1. In the embodiments shown in FIGS. 4 and 5, the amount of pullback of the two weft yarns is the same, but in the embodiments shown in FIGS. 6 and 7, by changing the position of each pin 12, The amount can be controlled separately.
Furthermore, in the embodiments shown in FIGS. 6 and 7, even when the swinging range of the movable member 1 cannot be widened, a large amount of withdrawal can be obtained.

Next, the operation of the weft pulling device of the present invention having the above-mentioned configuration will be explained with reference to FIG.

The weft yarn 9 inserted from the lower nozzle 6 is reeded toward the fabric front by a reed 7, and then cut by a cutter 8. In this state, before the weft jetting from the upper nozzle 6 starts, the movable member 1 swings from the solid line position shown in the figure toward the chain line position, and moves the upper weft 9 between the guide parts 3 and 4 almost in a straight line. The lower weft 9 is held on the outer circumferential surface 2a of the weft hooking part 2 and pulled back from the lower nozzle 6. The movable member 1 is held at the chain line position until the weft yarn 9, which has been injected from the upper nozzle 6 and inserted, is next cut. Of course, even if the weft is inserted multiple times in succession from the same nozzle, it can basically be carried out in the same manner as described above.

[Effect of idea]

As described above, the weft pulling device of the present invention is
one weft thread hooking section having an outer circumferential surface that engages with the weft thread; and movement connected to the weft thread hooking section to move the weft thread hooking section between two pull-back positions for pulling back the weft thread from the fluid injection nozzle. The structure is very simple because the moving member is operated to selectively move the weft thread hooking part to two pull-back positions while catching the weft thread on its outer peripheral surface. Moreover, it is easy to operate because it does not require threading the weft thread.

Further, in the embodiment, it is possible to adjust the amount of pullback, and moreover, the amount of pullback of the two wefts can be adjusted separately.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a weft pull-back device according to the present invention, FIG. 2 is a side view of the pull-back device, FIG. 3 is a schematic diagram showing a modification in which the direction of arrangement of the pull-back device is changed, and FIG. and FIG. 5 are schematic plan views showing different embodiments, and FIGS. 6 and 7 are schematic plan views and side views showing still further embodiments. 1... Moving member, 2... Weft hooking part, 2a...
Outer peripheral surface, 3 and 4...Guiding part, 5...Gripper,
6...Fluid injection nozzle, 8...Katsuta, 9...Weft, 10...Pin.

Claims (1)

[Scope of utility model registration request] A weft thread pull-back device for a fluid jet loom, comprising a pair of grippers and a pair of fluid jet nozzles each receiving a weft from the grippers, and inserting the weft alternately by the fluid jet nozzles. one weft thread hooking part that is disposed between the weft yarns and between the gripper and the fluid injection nozzle and has an outer circumferential surface that engages with the weft yarn; a moving member that moves between two pull-back positions for pulling back the weft, and by actuation of the moving member, the weft hooking part is selectively moved to the two pull-back positions while catching the weft on its outer peripheral surface. A weft pull-back device for a fluid jet loom, characterized in that the weft thread is moved to