JPH0547652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotating drum type weft yarn storage device for a stringless loom, and particularly to improvements in the weft locking and unwinding portions.

[Conventional technology]

In this type of rotating drum-type weft yarn storage device, it is necessary to lock the weft yarn when it is wound on the drum, and the locked weft yarn must be unwound when weaving. For example, Tokukai Akira
The invention of No. 50-142859 provides a gripping disk that is movable in the axial direction in the internal space of the length-measuring drum, and makes the teeth of the gripping disk protrude from the end surface of the length-measuring drum. It is fixed at the top. In this gripping type storage device, when unwinding the weft yarn, the user passively waits for the weft yarn to come off the teeth of the gripping disk, so the unwinding of the weft yarn is unstable and the weft insertion timing is likely to change. situation.

[Purpose of the invention]

Therefore, an object of the present invention is to stabilize weft insertion by actively removing the weft thread not only in locking the weft thread but also during unwinding and always keeping the unwinding point constant. be.

[Means for solving the invention]

Therefore, in the present invention, a disk that rotates at the same average speed as the drum is arranged on the front surface of the length measuring/storage drum, and notches are formed on the outer periphery of the drum and the disk. By aligning the notches at the time of locking, the weft is locked at that part, and when the weft is unwound, by shifting the phase of the disk relative to the drum during rotation, an apparent notch is created at the outer periphery of the weft. This eliminates this problem and actively unwinds the weft thread in a locked state.

〔Example〕

Hereinafter, an embodiment of the present invention will be specifically described.

1 and 2 show a rotating drum type weft yarn storage device 1 of the present invention. As seen in FIG. 1, this weft yarn storage device 1 includes, as main parts, a drum 2 for length measurement and storage, and a disk 3 for controlling the locking and unwinding of the weft yarn 4. This drum 2 has a plurality of notches 2a formed along the outer periphery of the unwinding side of the outer winding portion 2b in order to lock the weft yarn 4, and the disc 3 has a plurality of notches 2a formed along the outer periphery of the unwinding side of the outer circumferential winding portion 2b. Almost U-shaped notches 3a and slopes 3b are formed diagonally at the same intervals as 2a. The drum 2 is fixed to the end face of a hollow drum shaft 5, and a disc 3
is fixed by a disk shaft 6 inside the drum shaft 5. In this way, the disk 3 is located close to the unwinding end surface of the drum 2 and on the same axis.

The drum shaft 5 is rotatably supported by a bearing 8 provided inside the housing 7, and is supported by a gear 10 formed at its rear end.
It meshes with the gear 9 fixed to the input shaft 11. The input shaft 11 is rotatably supported by a bearing 12 with respect to the housing 7, and a first gear which is rotatably supported by a bearing 14 with respect to the disc shaft 6 is connected by a fixed gear 13. It is interlocked with 15. Further, the disc shaft 6 is rotatably supported by a sliding bearing 16 inside the drum shaft 5, and is also supported by the housing 7 by a bearing 17 at its rear end portion.

The first gear 15 meshes with a gear 18 located away from the center line of the drum shaft 5 and the disc shaft 6, and the gear 19 integrated therewith engages with a gear 18 located away from the center line of the drum shaft 5 and the disc shaft 6.
It meshes with a second gear 20 fixed to.
On the other hand, the gears 18 and 19 are planetary gears,
A bearing 23 is attached to a shaft 21 fixed to an arm 22.
It is rotatably supported by. Further, the arm 22 is rotatably supported at a boss 24 of the housing 7 on the same axis of the drum shaft 5 and the disc shaft 6. And these gear 1
5, 18, 19, and 20 constitute a planetary gear mechanism in which the gears 18 and 19 are planetary gears. Therefore, the disc shaft 6 is affected not only by the rotation of the input shaft 11 but also by the rotation of the arm 22, that is, the revolution of the gears 18 and 19.

This arm 22, as seen in FIG.
It is driven by a drive shaft 25 that is synchronized with the rotation of the loom. That is, the cam 26 attached to the drive shaft 25 has contours 16a, 16b, 16c,
16d, and is in contact with a cam roller 27 attached to one end of the lever 28. This lever 28
is rotatably supported by a support shaft 29 at a fixed position, and is supported by a tension spring 30 at one end.
The housing 7 is biased counterclockwise, and the housing 7 is biased from an opening (not shown) of the housing 7 at the other end.
into the inside of the connecting pin 31 and connecting link 3.
2 to one end of the arm 22.
Here, the cam 26 and the lever 28, together with the tension spring 30, the cam roller 27, the connecting link 32, etc., constitute means for imparting a swinging motion to the arm 22.

The weft thread 4 is wound several times around the outer periphery of the roller 33, passes through the thread guide 34, and is then wound around the outer periphery of the drum 2. Note that the roller 33 is a friction roller 35 that is integrated with the roller 33, and is a part of the friction roller 35 that is integral with the roller 33 and
It is in contact with the outer periphery of the large outer diameter part of. moreover,
The weft thread 4 passes through a thread guide 36 and a weft thread gripper 37, and is guided to a weft insertion nozzle 38. Note that an annular balloon breaker 39 is fixed to the outer periphery of the drum 2 and the disc 3.
The thread guide 34 is attached to that part.

Next, the operation of the weft yarn storage device 1 will be explained.

The gears 9, 10, 13, 15, 18, 19,
The number of teeth is 20, A, B, C, D, E, F,
G, there is a drum 2 and a disk 3 between them.
Since both must rotate at the same rotational speed, the following relationship is satisfied.

A/B=(C・F)/(E・G) Now, the rotation of the input shaft 11 is transmitted to the drum 2 via the gears 9, 10 and the drum shaft 5, and also to the gears 13, 15, 18, 19, 20 and disk shaft 6
It is also transmitted to the disk 3 via the.

Here, during the period in which the cam roller 27 is in contact with the low contour 26a of the cam 26, the arm 22 does not rotate about the axis of the disk shaft 6. Therefore, the disk 3 rotates at the same rotational speed as the drum 2 and in a relative positional relationship with respect to the drum 2 as shown in FIG. At this time, since the notches 2a and 3a lock the weft yarn 4, the weft yarn 4 is wound around the outer peripheral surface of the drum 2 and stored while being locked.

Eventually, when the cam 26 rotates and the cam roller 27 contacts its contour 26b, the arm 22 rotates clockwise in FIG.
19 is given a counterclockwise rotational motion, that is, in the opposite direction to the rotational direction of the drum 2. As a result, the disc axis 6
rotates at a lower rotational speed than the drum 2 under the influence of the revolving motion of its gears 18 and 19.

When the arm 22 swings by an angle θ, the phase angle β of the relative shift between the drum 2 and the disk 3 is determined by determining the composite rotation with the gear 15 fixed, and the resulting composite rotation number of the gear 15. By setting 0 to 0, it is expressed by the following formula.

β=θ・(E・G−D・F)/(E・G) As a result, the notch 2a of the drum 2 is closed by the notch 3a of the disc 3, and the outer circumference of the drum 2 appears to be This is the same state as if the notch 2a did not exist on the surface. For this reason, the weft thread 4, which was locked in the notches 2a and 3a, moves along the slope 3b and comes off from the notches 2a and 3a, as shown in FIG. It is set in a state where it can be done. In this unraveling state, the weft thread gripper 37
is opened, the weft threads 4 are released and introduced into the warp thread opening by the weft insertion nozzle 38. When a certain length of weft thread 4 is inserted,
The weft thread gripper 37 closes, and weft insertion is completed.
Such an operation is performed once during one rotation of the loom.

When the cam roller 27 passes the contour 26b of the cam 26 and comes into contact with the contour 26c, the arm 22 stops again, so the disc 3 continues to rotate at the same speed as the drum 2 without being displaced.

Next, when the cam roller 27 approaches the contour 26d, the disc 3 temporarily rotates at a faster speed than the drum 2, contrary to the above, so the relative positional relationship between the drum 2 and the disc 3 is Return to the state shown in Figure 3,
Here, the weft thread 4 is locked again and wound around the outer peripheral surface of the drum 2. During this period, the average speed of the disk 3 is equal to the speed of the drum 2.

In this way, the weft yarn storage device 1 repeats the length measurement and storage operations of the weft yarn 4 in synchronization with the rotation of the loom.

[Other Examples]

In the above embodiment, the gear 18 as a planetary gear,
Although a cam mechanism is used as a means for imparting rocking motion to 19, this cam mechanism may be replaced with a lever crank mechanism having a similar function.

〔Effect of the invention〕

In the present invention, the weft thread is positively locked by the notch in the drum and the disc, and the weft thread is unwound by the relative rotational movement between the drum and the disc without a notch. In other words, since unwinding is carried out actively with almost no resistance, the unwinding timing of the weft is stable, and the pull-out resistance during unwinding is low, so the length measurement operation is suitable for high-speed rotating looms. can be fully followed.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the weft storage device of the present invention, Fig. 2 is a rear view showing the meshing relationship of the gears, and Figs. 3 and 4 are parts showing the relative positional relationship between the drum and the disk. FIG. 1... Rotating drum type weft yarn storage device, 2...
Drum, 2a, 3a... Notch, 3... Disc, 4
... Weft thread, 5 ... Drum shaft, 6 ... Disc shaft,
9, 10, 13...gear, 15...first gear,
18, 19...Gear as a planetary gear, 20...
Second gear, 11... input shaft, 22... arm,
26...cam, 27...cam roller.

Claims (1)

[Scope of Claims] 1. A drum for length measurement and storage that rotates in synchronization with a loom and has a weft winding portion and a plurality of notches for weft thread locking on the unwinding side end surface, and a weft thread unwinding drum for this drum. A disk that is rotatably provided on the same axis as the drum near the shaft end surface and has a plurality of notches on the outer periphery corresponding to the above-mentioned notches; and a gear mechanism that provides a relative rotational motion of the drum, and when the weft thread is locked, the gear mechanism rotates the disc at the same speed and in the same direction as the drum, thereby aligning both the notches. , the weft thread is locked inside both notches, and when the weft thread is unwound, the gear mechanism shifts the phase of the disc relative to the drum during rotation, so that the weft thread in the locked state is moved between the two notches. A weft storage device for a no-thread loom, which is characterized by actively unwinding from the inside. 2. The gear mechanism includes a first gear that is arranged on the same axis as the disk shaft of the disk and rotates in synchronization with the loom, and a first gear that is on the same axis as the first gear and on the disk shaft. A fixed second gear, two gears as planetary gears that mesh with the first gear and the second gear and rotate as an integral part, and the two gears as the planetary gears are rotatably supported and the above-mentioned A non-thin loom according to claim 1, characterized in that the loom comprises an arm that revolves around a disk axis, and a means for giving this arm a swinging operation about the disk axis. Weft storage device.