JPH0260775B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a weft cutting device for a fragmentary loom.

(Prior art) Conventionally, there are two types of weft cutting devices for fragment looms: the so-called heat cutter type, which uses heat to burn out the yarn, and the mechanical cutter type, which mechanically shears the yarn. . For example, as a mechanical cutter type, there is one described in Japanese Patent Laid-Open No. 55-62244.

However, in all of these conventional systems, the cutter itself is installed at a fixed position, and is used in a stationary state from the perspective of the beating movement.

On the other hand, in a piece loom, after the weft is driven through a nozzle (after weft insertion), the weft is beaten with a reed, and then the weft ends are cut to form a woven fabric. Then, during a short period of time during beating, the weft is gripped by operating a weft gripping device provided on the yarn supply side of the weft insertion nozzle to completely stop the supply of the weft. Therefore, after the weft gripping device is activated,
During beating, a large tension is applied to the weft threads, creating internal stress. In particular, in the case of using highly twisted yarns as weft yarns, the generation of internal stress varies depending on the location, which subtly affects the development of highly twisted yarn torque, resulting in problems such as deterioration of the graining quality.

(Object of the Invention) An object of the present invention is to propose a weft cutting device for a fragmentary loom having a novel mechanism in order to solve the conventional problems.

(Structure of the Invention) The present invention provides a sled sword that moves integrally with a sled sword, a reed, etc. that performs a beating motion. It moves integrally with the same slay sword, reed, etc. as the lower blade cutter, and
It is comprised of upper and lower clamps that grip the weft before the upper and lower blade cutters act to cut the weft, and a mechanism that opens and closes the cutters and clamps.

The present invention will be explained with reference to the drawings.

FIG. 1 is a side view showing the attachment positions of parts of the apparatus of the present invention, and FIG. 2 is an enlarged side view of the cutter portion of the apparatus of FIG. 1.

In FIGS. 1 and 2, the slay sword 1 is
The sled sword shaft 1' swings around the fulcrum, and the cam lever 3 provided on the sleigh sword 1 swings around the fulcrum 2. The means for causing the rocking movement is not particularly limited, but for example, the cam ball 8 provided at one end of the cam lever 3 is engaged with a pinion 10' mounted on the shaft of a cam 9 provided on the sled sword 1, and This can be done by rotating the camshaft using a stationary rack 10 provided concentrically with the slay sword shaft 1'.

On the other hand, the drive balls 4, 4' provided at the other end of the cam lever 3, the upper blade cutter 5 which slides on the drive balls 4, 4' to perform opening/closing movements, and the clamp holder 6'. , cut the weft by:

That is, the upper clamp 6 that moves integrally with the upper cutter 5 and the clamp holder 6' that holds the lower clamp that is paired with the upper clamp 6 and grips the thread are connected to the drive ball 4, as described above. 4' to perform an opening/closing movement (swinging movement). The fulcrum of the opening and closing movement is 2'. The upper and lower clamps for gripping the thread are exemplified as being made of metal, plastic, hard rubber, or a combination thereof, but of course they may be made of other materials.

Next, a lower blade cutter 5' is provided which slides to open and close by a driving pin 7 provided on the clamp holder 6', and the lower blade cutter 5' forms a pair with the upper blade cutter 5 and slides. It has a surface and is attached so that the thread can be cut by opening and closing movements. The lower cutter 5' of the cutters 5, 5' is connected to the drive pin 7.
Since the thread is opened and closed by the clamp, it is activated after the thread is gripped by the clamp. That is, the lower clamp (not shown) provided on the clamp wire 6'' integrally attached to the clamp holder 6' forms a pair with the upper clamp 6, and opens and closes the thread a little later than the operation of gripping the thread. The lower cutter 5' can be pushed by the driving pin 7 to cause the lower cutter 5' to perform opening and closing movements.

In addition, in FIG. 1, 11 is the stationary rack 1.
0, a stay for fixing 12, a fabric winding device, 13
Temple bar 14 is a reed, 15 is a sleigh sword 1
and a cutter holder provided in one body, 16 is the warp thread,
17 is a heddle.

Note that the numbers in FIG. 2 indicate the same parts as those in FIG. 1, and 18 is a lead holder.

(Operations and Effects of the Invention) According to the device of the present invention, the cutters 5 and 5' that cut the thread move together with the reed 14, and the weft is held by the clamp when the thread is cut and even after the thread is cut. Because it is held, there is no abnormal tension applied between the operation of holding the weft thread and cutting the weft thread, and furthermore, the yarn end is held even after the weft thread is cut. There is no untwisting,
This is particularly suitable when using highly twisted yarns.

[Brief explanation of drawings]

FIG. 1 is a side view showing the attachment positions of parts of the apparatus of the present invention, and FIG. 2 is an enlarged side view of the cutter portion of the apparatus of FIG. 1...Sleigh sword, 3...Cam lever, 4,
4'...Drive ball, 5,5'...Cutter, 6...
...Upper clamp, 6'...Clamp holder, 7
... Drive pin, 14 ... Reed.

Claims (1)

[Claims] 1. A cam lever 3 provided on the sled sword 1 and swinging, drive balls 4, 4' provided at one end of the cam lever 3, and drive balls 4, 4' provided on one end of the cam lever 3.
4', an upper clamp 6 that opens and closes and moves integrally with the upper blade cutter 5 that moves integrally with the reed; a clamp holder 6' that holds a lower clamp paired with the upper clamp 6; It is characterized by comprising a lower blade cutter 5' forming a pair with the upper blade cutter 5, which opens and closes by a driving pin 7 provided on the clamp holder 6' and which opens and closes by the driving balls 4, 4'. A weft cutting device for a fragment loom.