JPH0313152B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for threading an empty bobbin during doffing.

[Conventional technology]

In the fiber manufacturing process, for example, false twisting, which gives crimping to the fibers, is carried out using a winder with a multi-cone arrangement.

Yarn is wound onto an empty bobbin and wound continuously, and a full cage that has wound a certain amount of yarn is doffed, replaced with a new bobbin, and starts winding again. The yarn supplied from the false twisting process is temporarily transferred to a waist pulley, which is a yarn take-up device, and wound up without stopping its supply. Then, while the yarn is being wound around the waist pulley, the full package is doffed, then the empty bobbin is donned, and after the empty bobbin is driven, the yarn wound around the waist pulley is empty. The yarn is pulled to the end of the bobbin, the yarn is wound around the empty bobbin, and winding is restarted.

[Problem to be solved by the invention]

The present invention is applicable to the so-called threading process in which the yarn wound around the waist pulley is pulled to the end of the empty bobbin for winding. The purpose of this invention is to alleviate the increase in thread tension that occurs during threading, prevent thread breakage during threading onto an empty bobbin, improve threading success rate, and reduce the amount of waist.

[Means to solve the problem]

The above object is achieved by employing the method of the present invention.

That is, in the present invention, while the yarn supplied during doffing is temporarily taken up by the yarn take-up device, doffing of the package cage on the cradle arm is completed, and an empty bobbin is attached to the cradle arm. A ball that drives the empty bobbin, then guides the yarn being taken up by the front and rear yarn take-up devices to the end of the empty bobbin being driven, winds the yarn on the empty bobbin, and resumes winding. In the method of threading during lifting, the thread taken by the thread taking device is guided to the end of the rotating empty bobbin by a moving thread guide member, The method is characterized in that the movement of the yarn guide member is temporarily slowed down or stopped just before the yarn is wound around the bobbin, and then the yarn guide member is moved again to wind the yarn around the end of the empty bobbin. It is in the method of threading during doffing.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a winding machine showing an example of a winding machine for carrying out the threading method according to the present invention, and FIG. 2 is a plan view of FIG. 1.

The basic structure of the winder 1 will be explained with reference to FIGS. 1 and 2.

The yarn Y processed in the false twisting process (not shown) etc. is attached to a swing fulcrum guide 2, a slide bar 3, and a traverse device 4.
The material is wound onto a bobbin B which is driven to rotate through frictional contact with a drive roller 5.

This winding machine 1 is normally configured with a large number of cones arranged in the lateral direction per stage, and furthermore, a plurality of upper and lower stages, one of which is shown in FIGS. 1 and 2.

The swing fulcrum guide 2 is located on an extension of the stroke center of the traversing device 4, and is located on the step 6 or the front beam 11.
It is fixed on the front of the.

The slide bar 3 _is provided on a fixed lower arm 7 extending from the frame of the winding machine 1 via a bearing 8 so as to be slidable in the longitudinal axis direction. A collar 9 is fixed (Fig. 2).

The traverse device 4 traverses the traverse guide 10 using a known means such as a scroll cam.

FIG. 8 is a partial sectional view showing the structure of a yarn take-up device for winding the waist, and FIG. 4 is a plan view of FIG. 8.

In FIGS. 1 to 4, the yarn take-off device is
On a shaft 13 rotatably provided via a bearing 12 fixed to the front beam 11, from the left are an auxiliary winding section 17, a ratchet wheel 18, a waist pulley 19, a waist reservoir 20,
The flange 21 is integrally constructed in this order. Further, this yarn take-up device is provided outside the traverse range of the yarn Y in a normal winding state.

The introduction guide 14 has a yarn restraining part 14' on the upper part, one end is fixed to the bearing 12, and the other end extends to the front surface of the waist pulley 19.

The winding position guide 16 extends rearward from the upper part along the outer peripheral surface of the waist pulley 19 and is attached to the front beam 11. Further, the guide surface 16a of the yarn Y of the winding position guide 16 has an inclined surface that has a wide opening at the introduction section at the front and becomes narrower as it extends rearward.

One end of the elbow guide 15 is fixed to the bearing 12, and the other end is provided at a position that serves as a yarn introduction guide in the yarn path during threading.

FIG. 5 is a plan view of the yarn conveying device for conveying the yarn Y ₆ introduced into the yarn take-up device to the bobbin B, and FIG. 6 is a side view of FIG. 5. Figure 5 a~
6c is a plan view for explaining the threading operation, and FIGS. 6a to 6c are side views of FIGS. 5a to 5c.

FIG. 7 is a front view illustrating the drive of the threading guide 31, FIG. 8 is a front view showing the relationship between the empty bobbin B and the threading guide 31, and FIG. 9 is a side view showing the mounting state of the positioning bracket 40. It is.

The configuration of the yarn conveying device will be described with reference to FIGS. 5 to 9.

A thread guide 31, which is a thread guide member, is attached to a roller chain 33 via a guide holder 32, and the roller chain 33 is attached to a square pipe 34.
is inserted loosely as a sheath.

The square pipe 34 has one end fixed to the front beam 11 with a fastener 39a, passes between the introduction guide 14 and the waist pulley 19 (see FIGS. 8 and 4), and is connected to the waist pulley 19 and the traversing device 4. (See Fig. 2) A curved portion 34a that bypasses the upper part of the drive roller 5 and is slightly downward at a position past the narrow part between the drive roller 5 and the cradle arm 44R.
(see Figs. 5, 6, and 9), along the outer periphery of a sprocket 36 that is integrally attached to the drive shaft 35 (see Figs. 1 and 7) via a split fitting 37. The other end is attached to the rear lower beam 88 with the stopper 3.
It is fixed at 9d. That is, the square pipe 34 has a stopper 39a at one end and a stopper 39d at the other end.
(See Figure 1).

The square pipe 34 is provided with slits 3 in a part necessary for engagement between the sprocket 36 and the roller chain 33 and a part necessary for movement of the thread hooking guide 31.
4', 34'' (see Figs. 7 and 8), and as the sprocket 36 rotates, the thread hooking guide 31 moves from the introduction guide 14 position along the curvature of the square pipe 34. Position 34P slightly ahead of the curved portion 34a on the propeller 5 (see Fig. 6)
The other end of the roller chain 33 reciprocates within a square pipe 34 fixed to a sprocket 36 and a rear lower beam 38.

The slider 38 extends from the square pipe 34 side so that the guide holder 32 can slide thereon, and also maintains the height of the threading guide 31 at an appropriate level.

The timing guide 28 is connected to the cradle arm 4
It is fixed downward to the front inner surface of 4R, and the tip is slightly higher than the thread guide 31, and is located at a position to avoid interference with the thread guide 31.

The thread hooking cutter 41 is attached to the upper part of the cradle arm 44R, and the folded portion at the tip of the cutter holder 43 that holds the cutter forms a guide piece 42, between which the thread hooking cutter 41 is attached. It is fixed in a non-contact state with the bobbin bearing 29R.

Next, the specific procedure of the method for threading during doffing according to the present invention will be explained.

During the dotting of the package P and the donning of the empty bobbin _B1 , the yarn Y that is continuously supplied is connected to the fulcrum guide 2, the slide bar 3, and the introduction point as shown in FIGS. 2, 5, and 6. It is taken over by a waist pulley 19 via a guide 14 and a winding position guide 16. Next, when the shaft 35 (see FIG. 1) is driven clockwise, the roller chain 33 inserted into the square pipe 34 is driven via the sprocket 36, and is attached to one end of the roller chain 33 via the guide holder 32. Thread hanging guide 31
scoops the running yarn Y ₆ between the introduction guide 14 and the winding position guide 16, and inserts it into the square pipe 3 set in advance.
The thread Y ₆ is pulled along the curved path 4 to the side of the empty bobbin B mounted on the cradle arm 44 .

As shown in FIG.
It starts moving toward bobbin B from the return position, and scoops up yarn _Y6 at point K.

In the process of reaching point L, the yarn Y ₆ that was in the restraint part of the introduction guide 14 is released and becomes a yarn path from the slide bar 3 to the thread hooking guide 31 .

When the threading guide 31 moves further and reaches point M,
The wrapping angle of yarn Y wrapped around the thread hooking guide 31 is
It is more than 90 degrees, and this wrapping angle increases as it moves.

At this time, the downstream yarn Y taken up via the threading guide 31 becomes a yarn path that is taken up directly onto the waist pulley 19 via the winding position guide 16. Therefore, the thread tension is gradually reduced by the ratchet wheel 18.
move in the direction of However, this threading guide 31
The change in the yarn path length due to the movement of is in the relationship that it becomes gradually longer, and if the circumferential speed is set so that both of these are canceled out, there will be no yarn slack.

The threading guide 31 moves further and passes outside the timing guide 28 provided on the cradle arm 44R, and when it reaches the point N shown in FIG. 6a, it reaches the point N shown in FIG.
This becomes the yarn path for yarn _Y7 shown in FIG. 6a. That is,
Pass through the swing fulcrum guide 2, slide bar 3, guard 27, and timing guide 28 to reach the threading guide 31, then make a 180 degree U turn and move to the elbow guide 15.
The yarn path is taken up by the waist pulley 19 via the winding position guide 16. In this way, the thread hooking guide 31
When moving from point M to point N, the length of the thread path from slide bar 3 to waist pulley 19 increases. Therefore, while the thread is being moved from the thread hooking guide 31, the tension of the thread increases in proportion to the moving speed.

Therefore, in the present invention, when the threading guide 31 reaches the point N, the drive shaft 3 of the roller chain 33 is
5 is temporarily decelerated or stopped, and waits for the tension of the running yarn Y to be dispersed and lowered.

Next, between point N and point N, the square pipe 34 is curved downward, and when the threading guide 31 moves along this curvature and reaches the point, the upstream thread is hung on the threading guide 31. Y ₇ indicates that the thread has come off the release end due to the timing guide 28 and the thread path, which had been bent, is now connected to the thread guide 31 from the guard 27.
As shown in Y ₈ , it instantly becomes a straight line due to thread tension.
(See Figures 5b and 6b) This yarn path _Y8 is sufficient for threading, and the yarn _Y8 is caught by the rotation of the ratchet wheel 30 provided on the flange of the bobbin bearing. Then, it is wound around bobbin B.

Furthermore, when the threading guide 31 reaches the point N, the drive shaft 35 of the roller chain 33 is temporarily stopped to wait for tension adjustment. The take-up peripheral speed on the pulley 19 is selected at a take-up position where the tension is low, and when the thread hooking guide 31 is stopped, the upstream yarn _Y5
The amount of slack increases in proportion to the stop time. accordingly
By waiting for tension adjustment for 0.5 seconds to 2 seconds, it is possible to select the appropriate tension for threading for any type of yarn. Note that it is desirable that this temporary stop of the drive shaft can be easily and variably set in advance using a timer or the like.

Next, the yarn Y ₈ hung on the ratchet wheel 30 is held between the bobbin B and the drive roller 5, and
280 from the back of bobbin B to the upper point 30a, as shown in Figures 5c and 6c.
At the point when the thread has been wound several times, the downstream thread caught on the ratchet wheel 30 is introduced to the thread hook cutter 41 fixed to the cradle arm 44R via the guide piece 42, and then cut. The cut end of the yarn on the downstream side is wound around the waist pulley 19, and the other end of the yarn on the upstream side is wound around the bobbin B via the ratchet wheel 30.

〔Effect of the invention〕

As described above, the present invention guides the yarn taken by the yarn take-up device to the end of the rotating empty bobbin by the moving yarn guide member, and the yarn is transferred to the empty bobbin. Doffing characterized by temporarily slowing down or stopping the movement of the yarn guide member immediately before winding, and then moving the yarn guide member again to wind the end of the empty bobbin. This method is used to alleviate the temporary increase in thread tension caused by an increase in the thread path length when pulling the thread taken by the thread take-up device to the end of the empty bobbin. can be carried out under constant tension, which has excellent effects such as preventing thread breakage while threading onto an empty bobbin, improving the threading success rate and reducing the amount of waist. play.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a winding machine showing an example of a device for carrying out the threading method according to the present invention;
The figure is a plan view of FIG. 1. FIG. 3 is a partial sectional view showing the structure of a yarn take-up device for winding the waist, and FIG. 4 is a plan view of FIG. 3. FIG. 5 is a plan view of the yarn conveying device, and FIG. 6 is a side view of FIG. 5. FIGS. 5 a to 5 c are explanatory diagrams for explaining the threading operation, and FIGS. 6 a to 6 c are side views of FIGS. 5 a to c. FIG. 7 is a front view illustrating the driving of the thread guide, FIG. 8 is a front view showing the relationship between the empty bobbin and the thread guide, and FIG. 9 is a side view showing the positioning guide in an attached state. DESCRIPTION OF SYMBOLS 1... Winder, 2... Swing fulcrum guide, 3... Slide bar, 4... Traverse device, 5... Drive roller, 10... Traverse guide, 12... Bearing, 13...
... shaft, 14 ... introduction guide, 16 ... winding position guide, 18 ... ratchet wheel, 19 ... waist pulley (take-up cylinder), 20 ... waist reservoir, 28 ... timing guide, 29 ... bobbin bearing, 30...Claw wheel,
31... Thread guide (yarn guide member), 32...
Guide holder, 33... Roller chain, 34...
... Square pipe, 35 ... Drive shaft, 36 ... Sprocket, 37 ... Split fitting, 38 ... Slider, 3
9... Stop fitting, 40... Positioning fitting, 41... Thread hook cutter, 42... Guide piece, 43... Cutter holder, 44... Crater arm.

Claims (1)

[Claims] 1. Complete the doffing of the package cage on the cradle arm while temporarily taking over the yarn supplied during doffing to the yarn take-up device, and then attach the empty bobbin to the cradle arm and drive the empty bobbin. , after that,
In the thread threading method during doffing, the thread being taken up by the thread take-up device is guided to the end of the empty bobbin being driven, the thread is wound around the empty bobbin, and the winding is restarted. The yarn being taken up by the yarn take-up device is guided to the end of the rotating empty bobbin by the moving yarn guide member, and the yarn is temporarily held at the end of the empty bobbin just before the yarn is wound around the empty bobbin. A method for threading during doffing, which comprises slowing down or stopping the movement of a thread guide member, and then moving the thread guide member again to wind the thread around the end of an empty bobbin.