JPS6024211B2 - Loom selvage thread tension adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a selvage thread tension adjusting device in a selvage setting device for a non-slip loom such as a fluid jet loom.

An example of this kind of selvedge-assembling device is the one shown in FIGS. 1 to 4 (Kokoku No. 18767, 1983).

That is, in this device, a round-shaped mounting frame 4 with a gear 3 formed on the outer periphery is attached to a shaft 2 held by a support arm 1 that is milled from the frame of a loom, and meshes with the gear 3. It is configured to be rotated in a fixed direction by a drive gear 5.

6 is a sun gear fixed to the protruding part of the crane 2 in the mounting frame 4;
, 7 are relay gears arranged on both sides of the sun gear 6, and each is pivotally supported on the mounting frame 4 via a shaft 8 so as to mesh with the gear 6.

Further, 9 is a shaft 10 so as to mesh with each relay gear 7.
These are two planetary gears that are symmetrically supported on the mounting frame 4 through the two planetary gears, and have a number of teeth of 2:1 with respect to the number of teeth of the sun gear 6. A bobbin holder 11 is fixed to the inner surface of each planetary gear 9, and a bobbin 13 having a ratchet wheel 12 on one side is rotatably supported on the bobbin holder 11 by a shaft 14.

Reference numeral 15 designates a lead-out portion for directly supplying the selvage yarn a derusted from the bobbin 13 toward the selvage assembly section in the weaving section as shown in FIG. 1, and 16 represents a tension-sensing arm for the selvage yarn a. .

This tension sensing arm 16 is swingably supported by a shaft 17 supported on the bobbin holder 11, and is biased by a spring 18 so as to rotate in one direction. Also 19
is a pawl that engages with the ratchet wheel 12 and is provided to protrude from the shaft 17.

Reference numeral 20 denotes a passive arm that is protruded from the shaft 17 so as to be located between the lead-out portion 15 and the tension sensing arm 16.

In this device, the two bobbins 13 are rotated by the drive gear 5 when the support frame 4 is rotated as the loom is operated.
As shown in FIG. 1, by rotating around the sun gear 6 in the direction of arrow A, the selvage thread a pulled out from each bobbin 13 moves up and down to weave the selvage part. However, in this case, the tension of the selvage thread a is adjusted as follows.

That is, the selvage thread a pulled out from the bobbin 13 is
, the passive arm 20, and the thread guide section 16a of the tension sensing arm 16, and are led to the lead-out section 15, from where it is stretched to the selvage section of the woven fabric.

When the tension of the selvage thread a is in a normal state, the passive arm 20 is in the position shown in FIG.

Therefore, in this state, the bobbin 13 does not rotate. However, when the tension of the selvage thread a increases and exceeds a certain limit,
By rotating the tension sensing arm 16 against the spring 18 to the position shown in FIG. 4 and also rotating the passive arm 20,
Separate the pawl 19 from the ratchet wheel 12. For this reason, the bobbin 13 is released and rotates to send out the selvage yarn a and relieve the tension. When the tension of the selvage thread a is relaxed, the passive arm 20 and the tension sensing arm 1
6 returns to the state shown in FIG. 3, and the pawl 19 meshes with the ratchet wheel 12 again. However, in such a conventional selvage assembly device, the restoring force for the pawl 19 to engage with the ratchet wheel 12 is obtained only by the tension of the selvage thread a; The tension of the selvage thread may drop too much the moment it comes off.

In other words, especially when the selvage thread tension is set low to prevent ear hanging, the restoring force of the retaining pawl 19 is weak, so the retaining pawl 1
There was a problem in that the re-meshing of the ratchet wheel 9 and the ratchet wheel 12 was delayed, causing the bobbin 13 to overrun, resulting in a large amount of selvage thread being supplied and a decrease in selvage thread tension. This invention was made by focusing on such conventional problems, and the force necessary to obtain the restoring force of the retaining pawl 19 regardless of fluctuations in the selvage thread tension is determined by applying the tension that affects the selvage thread tension. The purpose of this is to provide the sensing arm 16 separately from the spring 18 to solve the above problem.

Embodiments of the present invention will be described below with reference to FIGS. 5 to 9.

In the figure, the same reference numerals as in FIGS. 1 to 4 indicate equivalent parts.
5 to 7 show a first embodiment of the present invention, in which the base of an arm 21 is attached to one outer protruding end 17a of a pivot 17 that extends integrally with a retaining pawl 19. A tension spring 23 serving as a biasing body is stretched between the free end of the arm 21 and a locking piece 22 protruding from the bobbin holder 11 to create a restoring force in the direction in which the locking pawl 19 engages with the ratchet wheel 12. is given to prevent over-rotation of the selvage thread bobbin 13.

FIG. 8 shows a second embodiment, in which the base of an arm 24 made of a magnetic material is attached to one outer protruding end 17a of a pivot 17 that rotates integrally with a retaining pawl 19. A permanent magnet 25, that is, a biasing body, which acts to rotate the bobbin holder 11 is fixed to the bobbin holder 11, and is biased so that the pawl 19 rotates in the direction in which it engages with the ratchet wheel 12.

Further, FIG. 9 shows a third embodiment, which shows the retaining pawl 19.
The barrel portion 17b of the pivot 17 relative to the bobbin holder 11 of
A swinging spring 26, which is a biasing body, is mounted with iron, and one end 26a of the spring 26 is attached to the side plate 1 of the tension sensing arm 16.
6a, and the other end 26b is hooked to the second passive arm to urge the pawl 19 to rotate in the direction of meshing with the ratchet wheel 12.

Note that it is preferable that the urging force of these urging bodies be weaker than the urging force of the spring 18 on the tension sensing arm.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

FIG. 6 shows a state in which the retaining pawl 19 is engaged with the ratchet wheel 12 that is integrated with the bobbin 13. Therefore, in this case, the bobbin 13 does not rotate in the direction of arrow B. As weaving progresses in this state and the selvage thread a is further pulled out in the direction of arrow C, the tension of the selvage thread a gradually increases. Due to this increase in the tension of the selvage thread a, the tension sensing arm 16 rotates in the direction of the arrow ○ against the spring 18, and after the tension exceeds the limit and collides with the passive arm 20, the tension sensing arm 16 rotates along with the passive arm 20. and further rotate in the direction of the arrow EPD. Since the passive arm 20 and the pawl 19 rotate together, when the passive arm 20 rotates in the direction of arrow D, the pawl 19 rotates in the direction of arrow E and withdraws from the ratchet wheel 12. Therefore, the bobbin 13 is released and rotated in the direction of arrow B, thereby letting out the selvage thread a and relieving the selvage thread tension. When the selvage tension decreases, the tension sensing arm 16 returns to the direction of arrow F due to the action of the spring 18, and the passive arm 20 also moves in the direction of arrow F.
The stop pawl 19 again engages with the ratchet wheel 12 to stop the rotation of the bobbin 13. In this case, since the passive arm 2 of the conventional device was rotated in the direction of the arrow F only by the tension of the selvage thread a, the restoring action was slow, and problems such as overrun of the bobbin 13 were likely to occur. According to the present invention, the spring 23 or 2 is used as a biasing body for the retaining pawl 19.
6 and the action of the magnet 25, the retaining claw 1
The restoring operation of 9 is ensured, and overrun of the bobbin 13 can be prevented.

After the pawl 19 engages with the ratchet wheel 12, the tension sensing arm 16 rotates in the direction of arrow F until the tension of the selvage thread and the force of the spring 18 acting on the tension sensing arm 16 are balanced. .

In the third embodiment, it rotates in the direction of arrow F until the combined force of the selvage tension spring 18 and spring 26 is balanced. As explained above, since the device of the present invention is constructed as described above, it is possible to prevent a decrease in the restoring force of the retaining pawl 19 due to a decrease in the tension of the selvage thread in consideration of selvage hanging due to the increase in the size of the selvage thread bobbin. Its responsiveness can be improved. That is, in the conventional device, the retaining pawl 19 was restored only by the tension of the selvage thread, but in the device of the present invention, a new biasing means is added to the retaining pawl 19, so that the responsiveness of the retaining pawl 19 can be improved.

Therefore, according to the present invention, it is possible to set the selvage thread tension lower than the overrun generation limit tension of the follower device. In this way, even when the tension is set lower than that of the conventional weaving machine, responsiveness is ensured and bobbin overrun can be prevented, so the present invention has the effect of further improving the performance of this type of loom.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a selvage thread tension adjustment device, Fig. 2 is a front view of a conventional selvage thread tension adjustment device, and Fig. 3 is a longitudinal side view thereof.
FIG. 4 is a partial view for explaining its operation, FIG. 5 is a front view of the device to which the present invention is applied, FIG. 8 is a side view showing a second embodiment of the present invention, and FIG. 9 is a front view showing a third embodiment. 11...Bobbin holder, 12...Rawl wheel,
13... Ear thread bobbin, a... Ear thread, 15... Derivation part, 1
6...Tension sensing arm, 17...Pivot, 1
8... Spring, 19... Stop claw, 20...
... Passive arm, 21 ... Arm, 22 ... Latching piece, 23 ... Tension spring, 24 ... Arm, 25 ... Magnet, 26 ... ...Replacement spring. Figure 1 Figure 2 Figure 3 Crab Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 A pair of selvage bobbins are rotated and revolved on the side of the loom, and each selvage bobbin has a tension-sensing arm having a spring that counteracts the tension of the selvage thread unwound from the selvage thread bobbin; A passive arm is provided with a pawl that meshes with a ratchet wheel provided integrally with the bobbin, and the tension-sensing arm senses that the selvage thread tension exceeds a limit and is pulled forward against the spring. In the selvage assembly device, the selvage thread bobbin is released only when the selvage thread bobbin collides with the passive arm to cause the pawl to withdraw from the ratchet wheel.
A selvage thread tension adjusting device for a loom, characterized in that a biasing body is provided to provide a restoring force in a direction in which the stop pawl engages with the ratchet wheel to prevent over-rotation of the selvage thread bobbin.