JPH0333821B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft length measuring device. More specifically, the present invention relates to a device used in a shuttleless loom such as an air jet loom, which measures and stores a weft yarn inserted into an opening between upper and lower warp yarns.

As is well known in the art, when weaving is performed using an air jet loom, for example, the length of the weft yarn to be inserted is measured and stored in advance. Various length measurement and storage methods are known, including a method in which the weft yarn is stored in a pool pipe using compressed air, a method in which the weft yarn is wound around the circumferential surface of a length measuring drum, and the like.

The present invention relates to an improvement of a length measuring device that implements the latter method of storing a weft by winding it around the circumferential surface of a length measuring drum among the length measuring and storing methods described above.

Broadly speaking, there are two methods for winding the weft around the circumferential surface of the measuring drum. That is, a length measuring drum consisting of a fixed plate and a length measuring member is fixed, and a weft winding tube rotates around it to wind the weft.
The weft supply member is stopped, and the weft winding drum, which is made up of a fixed plate and a length measuring member, rotates to wind the weft around the weft winding drum. The present invention is applicable to any of the types mentioned above.

In such a length-measuring drum type weft length measuring device, the timing of winding the weft around the drum and the timing of unwinding the weft from the drum are controlled so that the length of the weft and the amount of storage are set to desired values. However, the conventionally proposed members for controlling the timing of winding the weft yarn around the drum and the timing of unwinding the weft yarn from the drum have a complicated mechanism and have the disadvantage that the device becomes large.

Further, in a loom, it is necessary to change the weft length measurement amount in accordance with changes in the weaving width, weaving structure, and other weaving conditions of the woven fabric to be woven. In a length measuring drum type weft length measuring device, the amount of weft length measurement is changed by changing the mounting position of the length measuring member with respect to the fixed plate. However, as mentioned above, as the drive mechanisms for the winding control member and the unwinding control member have become larger, the adjustable range of the weft winding member has become narrower.
There was also the problem that the range in which the weft length measurement amount can be changed is narrow, and changes in weaving conditions cannot be adequately addressed.

The present invention has been made to solve such problems, and an object of the present invention is to provide a weft length measuring device that has a simple and compact structure and can change the weft length measurement amount over a wide range. . In the present invention, a fixed plate, a length measuring member fixed to the fixed plate, a weft winding member rotatable relative to the fixed plate around the axis of the weft length measuring device, and a length measuring member fixed to the fixed plate are provided. In a weft length measuring device having a member for controlling winding of a weft thread and unwinding of the weft thread from the length measuring member, the control member is located at a distance in the circumferential direction of the fixed plate, and the control member is located apart from the fixed plate in the axial direction. A weft length measuring device comprising two pin members protruding from each other, the pin members being able to rotate about their own axis in synchronization with each other, and the pin member having a thread locking portion. This goal is achieved by:

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention. In the embodiment shown in FIGS. 1 and 2, a length measuring drum consisting of a fixing plate 16 and a length measuring member 13 is fixed, and a tubular weft winding member 14 rotates around the length measuring drum to wind the weft Y. It's becoming like that. That is, like the conventional drum-fixed weft length measuring device, a hollow rotating shaft is rotatably supported in the housing by a pair of bearings. A weft winding member 14 is installed near the tip of the rotating shaft.
is installed. Furthermore, a fixed plate 16 is supported by a bearing at the tip of the rotating shaft so as to be rotatable relative to the rotating shaft. A pulley is fixed to the rear end of the rotating shaft, and a belt is wound around the pulley. The belt drives the pulley in synchronization with the crankshaft of the loom, so that the weft winding member 14 rotates in synchronization with the crankshaft of the loom. On the other hand, since the fixed plate 16 is supported via a bearing, it is substantially stationary regardless of the rotation of the rotating shaft. A cover (the cover is removed for convenience of explanation in FIGS. 1 and 2) is fixed to the housing so as to surround the rotation area of the weft winding member 14, and the cover is fixed to the housing so as to surround the rotation area of the weft winding member 14. At times, this prevents workers from getting injured.

The fixed plate 16 includes a length measuring member 13, a winding control member 11 that controls release of the weft Y wound around the length measuring member 13, and a winding control member 11 for controlling release of the weft Y wound around the length measuring member 13, and a winding control member 11 for controlling the release of the weft Y wound around the length measuring member 13 in the axial direction of the weft Y wound around the length measuring member 13. An unwinding control member 12 is attached to control the transition of the material. Length measuring member 1
3 to the fixing plate 16, the length measuring member 13 is moved along the slit 17 (see FIG. 2) cut in the surface of the fixing plate 16 and fixed at an appropriate position.

The weft Y fed through the weft winding member 14 from the hollow hole of the rotating shaft is wound around the winding control member 11, the unwinding control member 12, and the length measuring member 13, its length is measured, and the weft is stored at the same time.

The winding control member 11 and the unwinding control member 12 are spaced from each other in the circumferential direction of the winding control member 11 and protrude from the surface of the winding control member 11 in the direction of the rotational axis of the weft winding member 14. Wrapping control member 11, unwinding control member 12, and length measuring member 13
The root portion on the fixed plate 13 side is a tapered portion whose diameter decreases toward the tip, and a cylindrical or tapered tip portion with a gentler slope than the tapered portion is connected to the tapered portion. The winding control member 11 has an L-shaped thread locking portion 11a attached to the tapered portion. Further, the unwinding control member 12 has a T-shaped thread locking portion 12a attached to its tip.

The guide member 15 is provided at the tip of the winding control member 11 and the unwinding control member 12, and is used to guide the weft that has been wound and stored around the winding control member 11, the unwinding control member 12, and the length measuring member 13. This will serve as a guide when unwinding the Y.

The winding control member 11 and the unwinding control member 12 are rotatable about their respective axes in synchronization with each other. An example of the rotation mechanism will be explained with reference to FIG. 4. The fork lever 21 is the rotation axis 2
One end is shaped like a fork, and the other end rotatably supports the cam follower 19. The cam follower 19 is pressed against the circumferential surface of the cam 18 by the action of the coil spring 24 . The cam 18 is connected to a rotating shaft connected to the weft winding member 14, and rotates in conjunction with the crankshaft of the loom. The fork lever 21 swings around the rotation shaft 20 in accordance with the rotation of the cam 18. The bearing 23 is fixed to the fixed plate 16, and swingably supports the winding control member 11 or the unwinding control member 12. A crank 22 connected to the winding control member 11 or the unwinding control member 12 engages the fork-shaped tip of the fork lever 21. Therefore, when the crank 22 is rocked by the cam 18,
The winding control member 11 or the unwinding control member 12 rotates about its axis.

Next, an example of the rotation timing of the winding control member 11 and the unwinding control member 12 will be explained with reference to FIG. 3.

A and b in Fig. 3 show the state just before the crank angle reaches 90°, and the winding control member 1
1 and the unwinding control member 12 are both connected to the guide member 15.
stands out from The yarn locking portion 11a of the winding control member 11 holds the weft Y wound by the weft winding member 14 in the tapered portion, and the yarn locking portion 12a of the unwinding control member 12 holds the stored weft. Unraveling of Y is restricted. When the crank angle approaches approximately 90°, the unwinding control member 12 rotates clockwise, the thread locking portion 12a sinks below the guide member 15, and the winding control member 11, unwinding control member 12, and measuring The weft Y wound around the long member 13 and stored is supplied to the main jet nozzle for weft insertion, and the weft Y wound around the winding control member 11 and the unwinding control member 12 is fed to the yarn locking section 11a. (see Figures 3c and d). When the crank angle approaches 310 degrees, the thread locking portion 12a located below the guide member 15 rotates counterclockwise and projects above the guide member 15. On the other hand, the winding control member 11 rotates counterclockwise and descends below the guide member 15 (see FIGS. 3c and 3d). As a result, the winding control member 11 and the unwinding control member 12
The weft yarn Y held in the tapered portion of the length measuring member 13 is transferred to the tip portion.

In the present invention, the winding and unwinding of the weft Y are controlled by the yarn locking part 11a and the yarn locking part 12a formed in the winding control member 11 and the unwinding control member 12, so the structure is simple. Moreover, the drive shaft of the weft winding member 14 and the drive shafts of the winding control member 11 and the unwinding control member 12 can be arranged in parallel, and the weft length measuring device can be configured extremely compactly. Furthermore, the winding control member 11
And since the unwinding control member 12 can be made compact, the movement distance of the length measuring member 13 can be made sufficiently large.
Therefore, the length measurement adjustment range of the weft Y can be made extremely large.

In the above description, the thread locking portion 11a and the thread locking portion 12a are pins, but as shown in FIG. 5, they may be plate-shaped locking pieces 11b.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a perspective view of the embodiment shown in Fig. 1, and Fig. 3 shows the operating status of the embodiment shown in Figs. 1 and 2. In the figures, a, b, and e are front views, b, d, and f are plan views, FIG. 4 is a perspective view of a mechanism for rotating the winding control member or unwinding control member of the present invention, and FIG. The figure is a perspective view of another embodiment of the winding control member. 11... Winding control member, 11a... Thread locking part, 1
2... Unwinding control member, 12a... Yarn locking part, 13... Length measuring member, 4... Weft winding member, 15... Guide member, 16... Fixing plate, 17... Slit, 18... Cam, 1... Cam follower, 20 ...Rotation shaft, 21...Fork lever, 22...Crank, 23...Bearing, Y
...weft.

Claims (1)

[Claims] 1. A fixing plate, a length measuring member fixed to the fixing plate,
a weft winding member that is rotatable relative to the fixed plate around the axis of the weft length measuring device; a member that controls winding of the weft around the length measuring member and unwinding of the weft from the length measuring member; In the weft length measuring device, the control member is located at a distance in the circumferential direction of the fixed plate,
Two pin members protrude from the fixed plate in the axial direction, and the pin members are rotatable about their own axis in synchronization with each other, and the pin member has a thread locking portion. A weft length measuring device characterized by: 2. The weft length measuring device according to claim 1, wherein the pin member includes a tapered portion whose diameter decreases from the fixed plate toward the tip, and a tip portion connected to the tapered portion. 3 Among the pin members, the member that controls the winding of the weft around the length measuring member has a thread locking part in the tapered part, and the member that controls the unwinding of the weft from the length measuring member has a thread locking part at the tip end. The weft yarn length measuring device according to claim 2, further comprising a yarn locking portion at the weft yarn length measuring device.