JPS62289650A - Apparatus for measuring length of weft yarn and storing saidyarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Technical Field of the Invention The present invention relates to a weft measuring method in which the length of the weft is measured by winding it around the outer periphery of a length measuring drum in a stationary state using a rotating guide, and the length is stored. The present invention relates to a length storage device, and particularly to a structure for steplessly adjusting the outer diameter of its length measuring drum.

In a conventional fluid jet loom, when a work-in-progress product is newly placed on the loom, regular operation is started after weaving conditions are set. One of the weaving conditions is to set the amount of length measurement commensurate with the threading width. If the measured length is longer than necessary, yarn loss will increase, so accurate settings are required.

By the way, in this type of drum-type length measurement storage device, the length measurement amount is set by winding the weft thread on the length measurement drum.

The depth is determined by changing the number and outer diameter of the measuring drum. When the adjustment range of the length measurement amount is shorter than the length of one turn of the weft yarn on the length measurement drum, the length measurement amount is mainly adjusted by changing the outer diameter of the length measurement drum. The outer diameter of the length-measuring drum is usually changed by manually moving a plurality of drum pieces constituting the length-measuring drum in the radial direction or by replacing the length-measuring drum.

On the other hand, the invention of Japanese Utility Model Application Publication No. 57-150573 shows a means for connecting a plurality of drum pieces under a screw pair with respect to a radial screw, and changing this screw by rotating a central bevel gear. ing. Furthermore, the invention disclosed in Japanese Patent Application Laid-Open No. 60-28550 discloses means for moving the constituent parts of the length measuring drum in the radial direction using a link mechanism or a cam mechanism.

However, in any of the above cases, when the winding diameter of the length measuring drum is changed, the relative positional relationship between the length measuring drum and the locking pin changes, so the timing of unwinding and locking the weft changes. However, these timings will need to be readjusted. However, if the locking pin itself is of a type that moves together with the length measuring drum when adjusting its outer diameter, the neck adjustment described above would not be necessary, but such a support mechanism would have a complicated structure. Therefore, it is virtually impossible to put it into practical use.

As another solution, as proposed in Utility Model Application Publication No. 57-150574, only the portion of the drum that the locking pin corresponds to is fixed, and the other drum portions are moved in the direction that changes the winding diameter of the measuring drum. It is possible to move it to However, according to this method, after changing the winding diameter, the axial cross-sectional shape of the length-measuring drum becomes approximately elliptical, and when unwinding the stored weft yarn,
The balloon of the weft yarn becomes unstable and uneven unwinding occurs, making stable unwinding of the weft yarn impossible.

Purpose of the Invention Therefore, an object of the present invention is to maintain the constituent parts of the length-measuring drum in a perfect circle while changing the winding diameter of the length-measuring drum, while at the same time changing the relative positional relationship between the length-measuring drum and the locking pin. The aim is to prevent fluctuations in the

SUMMARY OF THE INVENTION Therefore, the present invention consists of a length-measuring drum made up of a fixed drum piece and a plurality of movable drum frames, with one fixed drum piece facing a locking pin, and the other movable drum frame facing the center. The length measuring drum is brought into contact with a truncated conical cam at the position, and the displacement of this gam moves the length measuring drum to a position where it forms a perfect circle on the diameter line.

The truncated conical cam has a generatrix that is perpendicular to the upper and lower base surfaces, and corresponds to the fixed drum piece at that portion. Therefore, when this cam changes in the axial direction of the rotating system guide, the outer peripheral surface of the length measuring drum after adjustment, that is, the wrapping surface, always maintains a perfect circular radius with the fixed drum piece remaining in the same position. and change it.

As a result, when unwinding the weft yarn, the weft yarn is unwound while always forming a perfectly circular balloon, so the unwinding resistance does not change during the unwinding of one roll, and the circumference of the centrifugal force due to the balloon is Since it is the same at all positions above, stable unwinding operation can be expected.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a weft inserting device l for a fluid jet loom as a technical premise of the present invention.

This weft insertion device 1 includes a drum-type weft length measuring and storage device 2, a weft insertion nozzle 3, and a weft yarn detector 4.

The weft yarn length measuring and storage device 2 draws out the weft yarn 7 from the yarn supply body 6 by the rotational movement of the rotating guide 5 and winds it around the outer periphery of the length measuring drum 8 in a stationary state. This winding is a process, and the locking pin 9 is driven by the operating device 10,
By repeating forward and backward movement with respect to the outer circumferential surface of the length measuring drum 8, the weft thread 7 is locked on the circumferential surface of the length measuring drum 8 and is unwound at the weft insertion timing. Then, the unwound weft yarn 7 is inserted into the opening of the sheet-like warp yarn 11 by the weft insertion nozzle 3 together with the jetting fluid for weft insertion, and reaches the end of the warp yarn 11 on the opposite yarn feeding side. do. The tip of the weft thread 7 is optically and electrically detected by the weft thread detector 4 at the reached position.

Next, FIGS. 2 and 3 show the mechanical configuration of the weft length measuring and storage device 2 of the present invention. This weft length measuring storage device 2 includes, in addition to the above-mentioned rotating system guide 5 and length measuring drum 8, a feeding motor 12, which is driven by this motor 12, as a driving means for changing the outer diameter of the length measuring tram 8. The feed screw 13 is provided with a truncated conical cam 14 that fits under the pair of screws. The rotation system guide 5 is
One end fits into the tip of the sleeve 15 at the center of rotation, and together with the hollow rotating shaft 16, the front and rear bearings 1
7 fixed housing 18.19 and cover 2
It is rotatably supported inside the 0. The rotating shaft 16 is driven in synchronization with the rotation of the loom by a timing pulley 22 and a timing belt 23 whose rotation is prevented by a key 21. Then, the weft thread 7 passes through the inside of the guide nozzle 24 fixed at the center of the housing 19, and is guided there into the inside of the rotating guide 5 while being urged by the air flow from the air intake port 25. It will be done.

Further, the rotary shaft 16 supports the motor 12 at the distal end position of the rotary shaft 16 via a bearing 27 and a hollow shaft 28 by an intermediate shaft 26 at a disk 2° 9 and its center position. The disk 29 has a permanent magnet 30 on its outer periphery, which faces the permanent magnet 31 on the housing 18 side. These permanent magnets 30, 31 are connected to the measuring drum 8.
As a fixing means, the disk 29 and the portion supported by it are maintained in a stationary state while the intermediate shaft 26 rotates by applying magnetic adsorption force to each other.

Note that this stationary means can also be replaced with a planetary gear mechanism as in the above-mentioned Japanese Patent Laid-Open No. 60-28550.

The output shaft of the motor 12 is configured as a feed screw 13 and is fitted into a cam 14 under a screw pair. This cam 14 has a truncated conical shape, and is slidably fitted into a guide loft 33 parallel to the feed screw 13 at a portion on the generatrix side perpendicular to the upper and lower base surfaces, and is fitted with a spring. 32, it is always urged in a direction away from the motor 12. Note that power for the motor 12 is supplied from the fixed side by a cord 45 via slip rings 46 and 47.

The length measuring drum 8 is composed of a fixed drum piece 34 and a plurality of movable drum frames 35. These are arranged circumferentially around the axis of the feed screw 13, and one fixed drum, piece 34, is fixedly provided to the support plate 36 at the tip of the guide platform hood 33, and has a hole. The portion 370 faces the locking pin 9. Furthermore, each movable drum frame 35 is bent into a substantially L-shape when viewed from the side, and its central portion is in contact with the outer periphery of the cam 14 directly or by means of a roller 38. Link 39.40 and connecting pin 42
．． 43, it is connected to the support bracket 41 on the disc 29 side so as to form a parallel link, and is always urged toward the center by a tension spring 44.

Operation of the Invention Now, when the motor 12 rotates, the cam 14 is prevented from rotating by the guide rod 33, so depending on the direction of rotation of the motor 12, the cam 14 can move away from the motor 12 by the feed screw 13, or move away from the motor 12. Move in the direction of approaching/approaching. At this time, the spring 32 always biases the cam 14 in one direction, thereby absorbing the back-ruff shear of the threaded portion and making the amount of feed of the cam 14 exactly proportional to the amount of rotation of the feed screw 13. .

In this way, when the cam 14 moves in the direction of the feed screw 13, the fixed drum piece 34 is always fixed, but the other movable drum frame 35 is guided by the conical surface of the cam 14 and moves in parallel. The outer diameter of the length measuring drum 8 is changed.

At this time, all the movable drum frames 35 are connected to the truncated conical cam 1.
1 because it is in contact with 4. The fixed drum piece 34 and the plurality of movable drum frames 35 are always displaced on a perfect circular circumference, as shown in FIG. Therefore, when the weft thread 7 is unwound from the outer peripheral surface of the length measuring drum 8 after adjusting the outer diameter of the length measuring drum 8, the weft thread 7 always leaves the outer peripheral surface of the length measuring drum 8 while drawing a circular motion. is always drawn out in a clean state, especially partially without tension fluctuations. As a result, the weft insertion motion can be performed without sudden changes in the flying speed of the weft thread 7, and is stabilized.

Note that the outer diameter adjustment of the length measuring drum 8 is performed at the trial weaving stage.
Alternatively, it may be performed under manual or automatic control while the loom is in operation.

Modification of the Invention The above embodiment uses a parallel link mechanism to move the movable drum frame 3.
The supporting means for this movable drum frame 35 is, as shown in FIG.
The movable drum frame 35 is slidably supported by the radial guide loft 48, and the coil spring 5o
It is also possible to have a structure in which it is biased toward the center by.

Furthermore, as shown in FIG. 5, this support portion may rotatably support each movable drum frame 35 using one pin 53, arm 52, and tension spring 44.

Further, the shape of the cam 14 is not limited to that in the embodiment, and it may have a predetermined cam surface that allows the plurality of movable drum frames 35 to move in the radial direction while being positioned on the circumference. It may also be shaped like a truncated cone as shown in FIGS.

Effect of the invention The present invention provides the following effects.

The length measuring drum includes a fixed drum piece, and this fixed drum piece is always in a fixed position facing the locking pin, so even after changing the winding diameter of the length measuring drum, the connection between the length measuring drum and the locking pin remains constant. Since there is no change in the relative positional relationship, there is no need to adjust the position or timing of the locking pin.

In addition, since the multiple movable drum frames are in contact with the right-angled truncated cone-shaped cam surface while being biased toward the center, these movable drum frames remain fixed even after changing the winding diameter of the measuring drum. The unwinding resistance of the weft does not change on the circumferential surface of the measuring drum, and the centrifugal force of the weft balloon during unwinding can also be measured. Since the unwinding operation is uniform on each circumferential surface of the drum, the unwinding operation of the weft yarn is stabilized.

[Brief explanation of drawings]

Figure 1 is a schematic plan view of the weft insertion device, Figure 2 is a vertical sectional view of the weft length measuring and storage device, Figure 3 is a front view of the length measuring drum, and Figures 4 and 5 are the movable drum frame. FIGS. 6 to 8 are front and side views of modified examples of the cam. l... Weft insertion device, 2... Weft length measuring and storage device, 3...
・Weft insertion nozzle, 4. Weft thread detector, 5. Rotating system guide, 8. Length measuring drum, 9. Locking pin, 12.
Motor, 13...Feed screw, 14...Truncated conical cam,
34...Fixed drum piece, 35...Movable drum frame. Figure 7 Figure 2 Figure 3 Figure 4 Figure 6 7 8

Claims (2)

[Claims] (1) The weft is wound around the outer periphery of a length measuring drum in a stationary state by the rotational movement of a rotating guide, and is stored while measuring the length.
In a weft length measuring storage device for a fluid jet loom, which controls the unwinding and locking of the weft by a locking pin that can move forward and backward with respect to the length measuring drum, a feed screw is formed on the shaft of a feed motor, The cam is combined with the feed screw in a non-rotating state under the screw pair, and the length measuring drum is positioned on the circumference including the fixed drum piece corresponding to the position of the locking pin and this fixed drum piece. a plurality of movable drum frames, each of which is movable in a radial direction and supported while biased toward the center;
A weft yarn measuring and storing device characterized in that the central portion of the movable drum frame is brought into contact with the circumferential surface of the cam. (2) The weft yarn length measurement and storage device according to claim 1, wherein the cam is configured in a frustum shape.