JPH01260038A - Static drum-type weft reservoir - Google Patents

Abstract

PURPOSE:To provide the title reservoir so designed that a flexible fine filament loop wrapped on the peripheral surface of a yarn storage drum is so constructed as to be capable of weft's latching and unlatching at any position on the peripheral surface of said drum through the back-and-forth driving of a movable member, thereby ensuring the change in weft length to be coped with change in wrapping number. CONSTITUTION:The objective reservoir is so constructed that a weft 16 wrapped on a yarn storage drum 10 is introduced into a weft inserting nozzle through the gap between the outer peripheral surface of said drum 10 and a loop 30 consisting of a flexible fine filament 35 formed on the outer peripheral of the side end of the weft inserting nozzle of said drum 10. The loop 30, with retreat of a movable member 40, narrows said gap to latch the weft 16, while, with advance of said member 40, widens said gap into a circle concentric with said drum 10 under the limitation of a circle guide 34, thus forming a given space between the loop 30 and the outer peripheral surface of said drum 10 to enable the weft to be released without any resistance along with suppressive action of the loop 30 on the balooning of the weft 16.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a weft storage device for a fluid jet weft insertion device, which has a structure in which the weft is wound and stored around a drum held in a stationary state. The present invention relates to a fixed drum type weft storage device, and particularly relates to a device characterized by a means for holding the yarn end at the end of the drum during yarn storage.

(Prior Art) A means that has been put into practical use as a yarn end holding means during yarn storage in a fixed drum type weft storage device has a structure in which the yarn end is locked with a pin that advances to the drum circumferential surface at a predetermined timing. ,
It has a structure in which the yarn ends are urged and held in the circumferential direction of the drum using swirling airflow. The former pin-locking type changes the length of the stored weft by changing the drum diameter, while the latter swirling airflow type changes the stored weft length by winding the weft onto the drum. This is done by changing the number of times. In addition, some pin locking types have a structure in which a large number of pins are arranged in the circumferential direction of the drum, and one pin selected from among them is advanced for each pick to change the weft length. There is also a structure in which this is done by changing the number of turns.

(Problems to be Solved by the Invention) The method of changing the weft length by changing the drum diameter has the disadvantage that the drum has a divided structure, which makes the structure complicated, and the work of changing the weft length is troublesome. The swirling airflow type is
Although the drum structure is simple and the weft length can be easily changed by changing the rotation speed of the winding arm, there are problems with the power consumption of the blower that generates the airflow and the need to unwind the weft against the swirling airflow. Therefore, there is a problem that it cannot be used in air jet looms where the yarn conveying force is small.

In addition, the structure in which a large number of pins are selectively advanced as described above has a drive mechanism and a single drive mechanism for individually advancing and retracting a large number of pins.
This requires a control device such as a computer that outputs a pin selection signal for each pick, resulting in a complicated and expensive structure.

An object of this invention is to solve the above problems, and is capable of holding the yarn end at any position on the circumference of the yarn storage drum, does not require power to hold the yarn end, and is capable of unwinding. The resistance is small and ballooning can be effectively suppressed,
To obtain a yarn end holding device for a fixed drum type weft storage device which has a simple structure and a high operating speed.

(Means for Solving the Problems) A fixed drum type weft storage device of the present invention that solves the above problems includes a stationary yarn storage drum 10 for winding and storing the weft 16. A loop 30 formed of a flexible strip 35 is provided at the end of the yarn storage drum 10 on the weft insertion nozzle side so as to surround the outer peripheral surface 15 of the drum, and a circular guide 34 is provided surrounding the loop. ing. The flexible strips herein include, for example, wires, monofilaments of synthetic resin, strips of metal or synthetic resin, and the like. One or both ends of the loop 30 are connected to a movable member 40 . The movable member 40 moves forward and backward at a predetermined timing corresponding to the weft insertion operation to expand and contract the diameter of the loop 30, and the circular guide 34 restricts the expansion of the diameter of the loop 30.

The weft storage device of the present invention is preferably used together with a gripper that controls the start and stop timing of weft flight, and the movable member 40 is driven approximately in synchronization with the opening and closing timing of the gripper.

(Function) The weft yarn 16c wound around the yarn storage drum 10 is guided to the weft insertion nozzle through between the loop 30 and the outer peripheral surface 15 of the yarn storage drum. When the movable member 40 retreats, the loop 30 of the strip 35 reduces in diameter and wraps around the outer periphery 15 of the yarn storage drum, fixing the end 16d of the weft yarn passing through the gap 33 with the yarn storage drum 10 to the drum circumferential surface. When the movable member 40 advances, the loop 30 expands in diameter to become a circle with a diameter regulated by the circular guide 34, and a gap 33 sufficient for the weft 16 to freely pass through is formed between the loop 30 and the yarn storage drum 10. be done. The loop 30 itself has flexibility, but the shape of the loop 30 when expanded is regulated by the circular guide 34,
Since it is a perfect circle concentric with O, a certain gap 33 is formed between the loop 30 and the outer peripheral surface 15 of the yarn storage drum, and the weft 1
6 passes through this gap 33 and is unwound in the direction of the drum axis without receiving any resistance, and the ballooning of the weft yarn is carried out through the loop 3.
Suppressed with 0.

(Example) In FIG. 2 showing the cross-sectional structure of an example of this invention,
Reference numeral 1 denotes a pincushion shaft supported by a bearing 3.4 on a stationary member 2 and rotationally driven by a drive device (not shown); 5 a pincushion arm extending obliquely in the normal direction from the pincushion shaft l; 6 a pincushion arm at the tip thereof; Rotating yarn feeder, 7 is a pre-winding drum which is rotatably supported on the bobbin winding shaft 1 with a bearing 8.9, 10 is a bearing 11 on the bobbin winding shaft 1;
．． Reference numeral 12 denotes a yarn storage drum similarly supported by the shaft, 13 a guide disk fixed to the yarn winding shaft 1 between the preliminary winding drum 7 and the yarn storage drum 10, and 14 a weft insertion nozzle side of the yarn storage drum 10. This is a cover ring provided so as to surround the outer circumferential surface 15.

The winding arm 5 is formed by a pipe, and the weft 16a passes from the axis of the winding shaft 1 to the prewinding drum 7.
is led to the outer periphery of Magnets 21 and 22 facing each other across the rotating surface of the peg arm 5 are provided on the stationary member 2 and the pre-winding drum 7, and magnets 23 and 24 facing across the rotating surface of the guide disk 13 are provided on the pre-winding drum. 7 and the yarn storage drum IO to hold the drums 7 and 10 stationary on the rotating yarn winding shaft 1. The guide disk 13 has an outer circumference that protrudes beyond the circumferential surface of the drum 7.10, and has an arc-shaped guide slit 25 as shown in FIG. A thread guiding slit 26 is provided.

The cover ring 14 is attached to the immovable member 2 so that it can be opened by tilting it around the bin 31 (imaginary line in the figure).
A ring-shaped gap is formed between the outer circumferential surface 15 on the weft insertion nozzle side and the weft 16 can freely pass through (Fig. 4).
.

The circumferential surface 32 of the guide ring has a circumferential guide: a
34 is cut out, and a loop 30 formed by winding a strip 35 is housed in this guide groove 34. strip 3
As the guide groove 5, a material having a certain degree of rigidity such as twisted piano wire or thick polyester monofilament is used.
It remains stable at 4. The strip 35 has one turn and a 45 degree loop 30, as shown in FIG. 1, and its ends are led into through holes 36, 37 extending tangentially from the guide groove 34. One end of the loop 30 is fixed to the cover ring 14 by a locking piece 38, and the other end is fixed to a plunger 40 provided with a collar 39.

The plunger 40 is slidably supported in the axial direction by a bearing sleeve 41 coaxial with the through hole 37, and is supported by a compression spring 43 interposed between the collar 39 and a seat surface 42 formed on the cover ring.
The strip 35 is biased in a pulling direction.

1, 44 is a camshaft that rotates in synchronization with the crankshaft of the loom, 45 is a cam, 46 is a three-arm lever that is pivotally connected to a stationary member with a pivot pin 47, and a cam 45 is attached to the first arm 48. A cam roller 49 that engages with the plunger 40 is pivoted, the tip of the second arm 50 is a pushing end 51 facing the plunger 40, and a tension spring 53 is stretched between the third arm 52 and the stationary member. The cam roller 49 is pressed against the cam 45.

The strip 35 is pulled by the biasing force of the spring 43 and wound around the outer peripheral surface 15 of the yarn storage drum 10, but the cam 45
When the three-arm lever 46 rotates clockwise in the figure, the pushing end 51 of the second arm pushes the plunger 40, the strip 35 is pushed in the axial direction, and the loop 30 expands in diameter to form the guide groove. It fits within 34.

Figures 5 to 8 schematically show the operation of the weft storage device shown in Figures 1 to 4. FIG. 5 shows the yarn storage state, in which the yarn end 16d is held by a loop 30 wound around the yarn storage drum 10, and the weft 16b is pulled out from the rotary yarn feeder 6 and placed on the preliminary winding drum 7. The yarn is transferred to the yarn storage drum 10 and wound so as to be scooped up at the rear end of the guide slit 25 which rotates in synchronization with the rotating yarn feeder 6.

FIG. 6 shows a state in which the pushing end 51 of the three-armed arm pushes the plunger 40 to expand the loop 30, and the weft yarn 16 is being unwound by free flight. When all the weft yarns 16c on the yarn storage drum 10 are unwound, the weft yarns 16c on the preliminary winding drum 7 are unwound.
6b is pulled through the guide slit 25, and the weft 16b is fed out at a speed approximately equal to the circumferential speed of the guide slit 25 while being guided by the front end of the guide slit 25, resulting in a so-called restrained flying state (6th figure).

When weft insertion is completed and the three-arm arm 46 returns,
The loop 30 is wrapped around the yarn storage drum 10 again to form the yarn end 16.
d (Fig. 8), the weft 16c for the next pick is wound around the yarn storage drum 10 by the rotation of the rotary yarn feeder 6 and the guide slit 25 (Fig. 4).

In the embodiments described above, only one end of the loop 30 is moved forward and backward, and the other end is fixed, but it is of course possible to expand and contract the loop 30 by moving both ends forward and backward at the same time. Also loop 3
0 itself requires an end, but the strip 3 that forms this
0 may be endless.

(Effects of the Invention) In the fixed drum type weft storage device of the present invention described above, the yarn end is held by the strips wound around the drum circumference, so the yarn end can be held at any arbitrary position on the drum. Therefore, it is possible to cope with changes in the weft insertion length by adjusting the number of windings, and the process of changing the drum structure and weft length becomes simple.

Further, since no power is required to hold the yarn ends, running costs are low, and the weft unwinding resistance from the drum is low, it can also be used in air jet rooms. Furthermore, the structure is extremely simple, and the operating stroke and inertia when holding and releasing the yarn end are small, so there are excellent effects such as easy speeding up.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view of section A in Fig. 2, Fig. 2 is a vertical sectional view, Fig. 3 is a sectional view of section B in Fig. 2, and Fig. 4 is a sectional view of section B in Fig. 2. The figure is a partial enlarged sectional view of the main part, and FIGS. 5 to 8 are perspective views schematically showing the operation of the apparatus. In the figure, 1: Bottle winding shaft 5: Bottle winding arm 7: Pre-winding drum 1O: Yarn storage drum 13 guide disk 1
4: Covering 15: Outer peripheral surface of yarn storage drum 16: Weft 25 Guide slit 30:
Loop 32: Inner peripheral surface of covering ring 33: Gap 34 Guide groove 35: Strip
40 Ni plunger 43: Compression spring
45: Cam

Claims (1)

[Claims] It has a stationary yarn storage drum (10) for winding the stored weft (16), and a loop formed with a flexible strip (35) on the outer periphery of the weft insertion nozzle side end of this yarn storage drum. (3
0), at least one end of the loop is connected to a movable member (40), and this movable member moves forward and backward at a predetermined timing to surround the loop (30) and restrict expansion of the diameter of the loop. A fixed drum type weft storage device, which is provided with a circular guide (34).