JPS633979B2 - - 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 of a loom.

As a conventional selvage device, there is one as shown in FIGS. 1 and 2 (see Japanese Utility Model Publication No. 18767/1983). That is, a pair of planetary gears 2 are provided at axially symmetrical positions on a rotary disk 1 driven by a loom, and a selvage bobbin holder 3 is attached to the side surface of these planetary gears 2. These planetary gears 2 are meshed with a fixed sun gear 4 via a relay gear 2a, and as the rotary disk 1 rotates, they revolve (in the direction of A in FIG. 1) and rotate on their own axis (in the direction of B in FIG. 1). do. Accordingly, the selvage bobbin holder 3 also rotates around its axis while revolving, and the selvage threads 6 pulled out from the selvage bobbin 5 rotatably attached to the selvage thread bobbin holder 3 are twisted together in the selvage assembly section 7.

Here, a selvage thread tension adjustment device is provided to adjust the tension of the selvage thread pulled out from the selvage thread bobbin 5. That is, a ratchet wheel 9 is integrally formed on one side of a selvage bobbin 5 rotatably attached to a shaft 8 bridging between both side plates of a selvage bobbin holder 3 formed in a U-shape. Another shaft 10 is rotatably attached between both side plates of the selvage bobbin holder 3, and a stop pawl 11 that can be engaged with the ratchet wheel 9 is formed protruding from this shaft 10. Reference numeral 12 denotes a selvage tension sensing arm rotatably attached to the shaft 10, and this sensing arm 12 is connected to a selvage thread tension adjusting spring 13 attached to the selvage thread bobbin holder 3.
is biased counterclockwise in FIG. 1
Numerals 4 and 15 are bolts and nuts for adjusting the set tension of the spring 13 for adjusting the selvage thread tension, and 16 is a selvage assembly 6 of the woven fabric of the selvage thread 6 pulled out from the selvage thread bobbin 5.
The selvage thread guide 17 is a passive arm whose tip is positioned between the selvage thread guide 16 and the selvage thread tension sensing arm 12, and this passive arm 17 is connected to the shaft 1.
It is formed to protrude from 0.

Here, the selvage thread 6 pulled out from the selvage thread bobbin 5
reaches the selvage thread guide 16 from the shaft 10 and the thread guiding portion 17a of the passive arm 17 via the selvage thread tension sensing arm 12,
The selvage thread guide 16 is adapted to be guided to the selvage section 7 of the woven fabric.

To explain the operation of such a selvage thread tension adjustment device,
When the tension of the selvage thread 7 between the selvage assembly part 7 and the selvage thread guide 16 increases and exceeds a certain limit, this tension of the selvage thread overcomes the spring force of the selvage thread tension adjustment spring 13. The selvage tension sensing arm 12 rotates clockwise in FIG. Then, the ear thread tension sensing arm 1
2 is in contact with the passive arm 17, the passive arm 17 and the pawl 11 rotate in the same direction as the selvage tension sensing arm 12, and the engagement between the pawl 11 and the pawl wheel 9 is released. Ru. Therefore, the selvage thread bobbin 5 is rotated by the selvage thread tension, and the selvage thread 6 is pulled out to relieve the selvage thread tension. When the selvage tension is relaxed, the spring force of the selvage tension adjustment spring 13 is overcome by the selvage tension, and this spring force causes the selvage tension sensing arm 12 to rotate counterclockwise in FIG. do. At this time, the passive arm 17 and the pawl 11 also rotate in the same direction, so that the pawl 11 meshes with the ratchet wheel 9. Therefore, the rotation of the selvage thread bobbin 5 is restricted, and delivery of the selvage thread 6 to the selvage assembly section 7 is stopped.

However, in such a conventional selvage tension adjustment device, the stop claw 11 and the passive arm 17 rotate while revolving around each other, and their centers of gravity are
Since G ₁ and G ₂ are provided inside the selvage bobbin holder 3 from the shaft 10, when the pawl 11 is located outside the ratchet wheel 9 with respect to the rotation center l, the centrifugal force F due to the revolution and rotation is ₁ , F ₂ sets pawl 1
1 and the passive arm 17 integrated therewith, the moment acting clockwise in FIG. 3 about the shaft 10 M ₁ =
F ₁ L ₁ and M ₂ =F ₂ L ₂ are generated, and the resultant force of these moments M = M ₁ +M ₂ acts clockwise in FIG. 3. In particular, when the loom rotates at high speed, the moment generated in the stop pawl 11 and the passive arm 17 becomes extremely large, and this moment causes the stop pawl 1 to come off the ratchet wheel 9 by itself, causing the selvage bobbin 5 to rotate and the selvage thread 6 to loosen. Moreover, even if it does not come off due to the moment, it tends to come off due to slight fluctuations in the tension of the selvage thread 6.

Further, when the pawl 11 rotates and is located inside the ratchet wheel 9 with respect to the rotation center l, a moment is generated in a direction that presses the pawl 11 against the ratchet wheel 9, contrary to the direction of the moment described above. The retaining pawl 11 was becoming difficult to come off from the ratchet wheel 9.

For this reason, each of the above-mentioned moments changes the balance between the selvage thread tension and the spring force of the selvage thread tension adjustment spring 13, making it difficult to maintain the tension of the selvage thread 6 constant and causing poor selvage assembly of the woven fabric. It was becoming. In particular, these problems have become more serious as the speed of looms has increased.

The present invention focuses on such conventional problems, and
In order to solve this problem, by providing a means for generating a moment in a direction that cancels the moment due to the centrifugal force of the pawl, the moment generated in the pawl is offset by the moment generated in the means, and the tension of the selvage thread is reduced. It is designed so that it can be held constant and prevents poor selvage of the woven fabric.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

4 and 5 show an embodiment of the present invention.

To explain the structure, a shaft 22 is bridged between both side plates of a U-shaped selvage bobbin holder 21.
A selvage thread bobbin 23 is rotatably attached to the selvage thread bobbin 23, and a ratchet wheel 25 is provided on one side of the selvage thread bobbin 23 to engage with a pawl 24 to be described later. A bolt 26 is bridged between both side plates of the selvage bobbin holder 21 and fixed by a nut 27, and this bolt 26 restricts the movement of both side plates of the selvage bobbin holder 21. A holding arm 28 is fixed to one end of this bolt 26.
A selvage thread guide hole 29 is formed at the tip of 8.

Further, another shaft 30 is bridged between both side plates of the selvage bobbin holder 21, and a U-shaped rotary plate 31 is rotatably attached to this shaft 30. Note that 32 is a spacer that restricts the movement of the rotating plate 31 in the axial direction. The shaft 3 between this rotating plate 31
A passive arm 33 is rotatably attached to the 0, and a selvage thread guide 34 consisting of a V-shaped groove is formed at the distal end of the passive arm 33. Further, a retaining claw 24 is integrally formed at the base end of the passive arm 33, and this retaining claw 24 is connected to a pin 35 formed protruding from the side plate of the rotary plate 31 and the selvedge thread bobbin holder 2.
A spring 37 for adjusting selvage thread tension tensioned between a pin 36 formed protruding from the inner surface of 1 is biased clockwise in FIG. It is designed to mesh with 25.

Here, to explain with reference to FIG. 6, by positioning the center of gravity G ₂ of the passive arm 33 and the center of gravity G ₁ of the stopper claw 24 on the left and right sides of the center shaft 30 in FIG. Moment M ₁ generated in the passive arm 33 and the locking claw 24 when rotating around l (rotation center of the selvedge thread bobbin holder 21) in Figure 6.
(=F ₁ L ₁ ) and M ₂ (=F ₂ L ₂ ) are in opposite directions,
Moreover, these moments M ₁ and M ₂ are set so as to be balanced. Here, the passive arm 33 serves as means for generating a moment that opposes the moment generated in the pawl 24.

Also, a screw 39 is provided at the center of the upper part of the rotary plate 31.
A rod-shaped selvage tension sensing arm 38 is attached to the selvage tension sensing arm 38 by nuts 40a and 40b, and a selvage thread guide 41 is attached to the tip of this selvage tension sensing arm 38.

The selvage thread 42 pulled out from the selvage thread bobbin 23 is passed through the selvage thread guide 34 at the tip of the passive arm 33 and engaged with the selvage thread guide 41 at the end of the rear selvage thread tension sensing arm 38 to be attached to the selvage thread guide 41 at the tip of the holding arm 28. Pull it through the thread guide hole 29,
From there, it is guided to the selvage section of the woven fabric. and,
When the tension of the selvage thread 42 increases and overcomes the spring force of the selvage thread tension adjustment spring 37, the selvage tension sensing arm 38 is rotated counterclockwise in FIG.
The head of the screw 39 formed integrally with the sensing arm 38 comes into contact with the passive arm 33 and presses it, thereby disengaging the locking pawl 24 and ratchet wheel 25 and releasing the restraint of the selvedge thread bobbin 23. The selvage thread 42 is sent out to the selvage assembly section. When the tension of the selvage thread 42 decreases, the selvage tension sensing arm 38 is rotated clockwise in FIG. 2
The rotation of 3 is restricted.

According to this configuration, the selvage thread bobbin holder 21
Even if the passive arm 33 rotates and revolves around l,
Since a moment is generated in the opposite direction to the shaft 30 and in the retaining pawl 24 and almost balanced, the conventional retaining pawl 24
The moment generated by the passive arm 33 can be balanced by the moment of the passive arm 33. For this reason,
The influence of centrifugal force due to rotation and revolution on the pawl 24 can be eliminated, and thereby the tension of the selvage thread 42 can be almost balanced only by the spring force of the selvage thread tension adjustment spring 37. Therefore, the engagement between the stop pawl 24 and the ratchet wheel 25 can be released by balancing the selvage thread tension with the spring force of the selvage thread tension adjustment spring 37, thereby keeping the selvage thread tension approximately constant. can be kept.

Therefore, even if the loom rotates at high speed, the stop pawl 24 can be prevented from coming off by itself or becoming difficult to come off from the ratchet wheel 25. Furthermore, the selvage thread tension can be kept almost constant, resulting in poor selvage of the woven fabric. can be prevented.

7 and 8 show another embodiment of the present invention, in which one end of the shaft 30 of the previous embodiment is extended, and the center of gravity of the retaining pawl 24 is located at the extended portion 30a.
By providing a balancer 43 having a center of gravity on the opposite side to zero, the moment generated in this balancer 43 and the moment generated in the stopper claw 24 are balanced. This embodiment can also achieve the same effects as the previous embodiment.

As explained above, the present invention is provided with a means for generating a moment in the direction of canceling the moment generated by centrifugal force in the pawl of the selvage thread tension adjusting device during operation of the loom, so that the moments are balanced. Therefore, the selvage thread can be delivered to the selvage part of the woven fabric by balancing the selvage thread tension and the spring force, thereby preventing the selvage setting defect of the woven fabric.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a selvage assembly device, Fig. 2 is a partial sectional view showing a conventional selvage thread tension adjustment device, Fig. 3 is an explanatory diagram showing the same operating state, and Fig. 4 is an embodiment of the present invention. FIG. 5 is a front view showing an example, FIG. 5 is a view taken along the - arrow in FIG. 4, FIG. 6 is an explanatory diagram showing the operating state of FIGS. 4 and 5, and FIG. The front view shown in FIG. 8 is a view taken along the - arrow in FIG. DESCRIPTION OF SYMBOLS 1...Rotary disk, 2...Planetary gear, 21...Earth thread bobbin holder, 23...Earth thread bobbin, 24...Stop claw, 25
...Rawl wheel, 29...Ear thread guide hole, 31...Rotary plate, 3
3...Passive arm, 37...Ear thread tension adjustment spring,
38... Ear thread tension sensing arm, 42... Ear thread, 43... Balancer.

Claims (1)

[Claims] 1 A pair of selvage bobbin holders 21 that are provided at axially symmetrical positions of the rotating body 1 and move planetarily; a selvage bobbin 23 that is rotatably attached to the selvage bobbin holder 21; a retaining pawl 24 which is actuated by the tension of the selvage thread 42 and the opposing force of the spring 37 to restrain the rotation of the selvage thread bobbin 23 when the tension of the selvage thread 42 decreases, and releases the restraint when the tension increases; In the selvage thread tension adjustment device for a loom, the stop claw 24 that occurs during operation of the loom.
A selvage thread tension adjustment device for a loom, characterized in that means 33, 43 are provided for generating a moment in a direction that cancels a moment due to centrifugal force.