JPH0765247B2 - Stopping method in spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is equipped with a simultaneous doffing machine and has a large number of protrusions between a tail thread cutting tooth portion provided on a spindle base and a spindle wave. The present invention relates to a stopping method in a spinning machine such as a ring spinning machine or a ring twisting machine, which is provided with a yarn gripping portion having

(Prior Art) In this kind of spinning machine, the yarn connected to the roller part is connected to the spindle while passing through the traveler so that the yarn can be automatically wound around the empty bobbin when restarting after the tube change. Required to be present. To meet this requirement,
Conventionally, as shown in FIGS. 4 and 5, the ring rail 1 is suddenly lowered by an automatic lowering device at the time of inertial rotation of the main motor after detection of the full pipe signal, and the full winding yarn 2 is obliquely wound 3 and then the spindle 4 is rotated.
The thread is wound around the knurled portion 5 several times and the tail thread winding 6 is performed, and then the machine base is completely stopped. Then, the simultaneous doffing machine (not shown) is operated to perform a pipe replacement operation between the full yarn 2 and the empty bobbin. When the full yarn 2 is pulled out, the slant winding 3
The yarn connected to the tail bobbin 6 is cut by the cutter (thread cutting tooth portion) 7, and the yarn 9 connected to the roller part (not shown) through the snell wire 8 is connected to the spindle 4 while passing through the traveler 10. At that time, an empty bobbin was inserted and the pipe replacement work was completed, and then the machine base was restarted.

However, when the tail thread winding 6 is performed on the knurled portion 5, the number of tail thread windings is required to be 3 to 4 in order to obtain a necessary gripping force, and the tail thread winding wound after the doffing of the full thread is performed. It remains on the spindle 4. If a large number of trailing thread windings 6 remain on the knurling section 5, the thread gripping action of the knurling section 5 will be reduced, or the thread end of the trailing thread winding 6 will become entangled with the winding thread when the machine is restarted, causing thread breakage. Therefore, it is necessary to remove the tail bobbin 6. Since the cutter 7 rotates at high speed together with the spindle 4 during the operation of the private stand, it is dangerous to remove the tail bobbin winding during the operation of the machine stand, and it is the machine stand that performs the residual thread treatment at every pipe replacement. In order to reduce the operation efficiency of the, it has conventionally been necessary to remove the tail bobbin every several doffings.

In order to eliminate this inconvenience, the applicant of the present application, as shown in FIG. 6, inserts the yarn between the yarn cutting tooth portion 7 provided at the base of the spindle 4 and the spindle warb 11 at the time of spinning in the opposite direction to the spinning rotation. A means for providing a thread gripping portion 12 having a large number of projections 12a for catching is adopted (Japanese Patent Application No. 60-150420).
In the case of a spindle provided with the thread gripping portion 12 of this configuration,
Even when the number of times the tail bobbin is wound around the thread gripping part 12 when stopping for doffing is less than one, the thread end connected to the traveler projects after the full bobbin is pulled out and the empty bobbin is inserted by the doffing machine.
It is securely held by the thread gripping part 12 in a state of being caught by 12a.
Then, during doffing, the thread cutting tooth portion 7 cuts the projection 12a.
When the rotation of the spindle 4 becomes the normal rotation, the yarn end (tail bobbin) that has been grasped at the end is scattered gradually or at once from the tip end thereof, and the tail bobbin 6 is not accumulated in the yarn grasping portion 12.

(Problems to be solved by the invention) However, when the brake is actuated after formation of the tail bobbin and the main motor of the machine stand is completely stopped, the traveler 10 stops after a little overrun due to the inertial force of the thread. . On the other hand, since the protrusion 12a provided on the thread gripping portion 12 has a large thread gripping force, the end of the tail thread winding 6 wound around the thread gripping portion 12 is folded back as shown in FIG. Grasp to 12. Therefore, when the ring rail 1 is raised to a predetermined position prior to the start of winding the yarn at the time of restarting after the completion of the pipe replacement, the tail spool 6
When the thread connected to the traveler 10 is caught by the cutting tooth portion 7, the end of the tail bobbin is strongly gripped by the protrusion 12a, so that the tail thread winding is not unraveled and the thread connected to the traveler 10 is strong in the cutting tooth portion 7. There is a problem that the yarn is broken due to the pressure contact.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, in the present invention, a rotation direction at the time of spinning is reversed between a yarn cutting tooth portion provided on a spindle base and a spindle warb. In a spinning machine provided with a thread gripping portion having a number of protrusions extending in the direction of the direction, when stopping for doffing, the ring rail is rotated at the tail position during inertial rotation after the main motor of the spinning machine is demagnetized. After lowering the thread and winding the tail thread on the thread gripping part, raise the ring rail until the position of the traveler on the ring rail is higher than at least the position corresponding to the thread cutting tooth part, and then complete the machine base. We adopted the method of stopping at.

(Operation) In the present invention, the ring rail is raised again after the tail motor is wound on the thread gripping portion while the main motor, that is, the machine base is in the inertial rotation state. Even when the thread is engaged with the cutting tooth, the yarn is continuously sent out from the roller part, and the protrusion of the thread gripping part rotates in the direction opposite to the direction of catching the thread, so the thread is strong against the cutting tooth. The ring rail is moved up to a predetermined position without being pressed. At the time of restart, the traveler on the ring rail is located higher than the thread cutting teeth, so even if the ring rail is raised, thread breakage does not occur and the thread is automatically wound around the empty bobbin automatically. Is done.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. The device used in this embodiment has the same structure as that of the conventional device except that the control circuit is different, and the same parts are designated by the same reference numerals for description.

Now, when the full pipe signal is detected, the excitation of the main motor is released, the machine base becomes coasting operation, and the automatic lowering device operates so that the ring rail 1 is automatically lowered to the position corresponding to the thread gripping portion, and during the lowering, A slanted winding 3 is formed on the yarn 2. Also, the normally closed contact MS1 of the electromagnetic contactor for driving the main motor
Is closed and the limit switch LS1 is turned on when the ring rail 1 is lowered to the position corresponding to the thread gripping portion 12, and the timer TR1 for setting the tail bobbin winding length starts counting. Since the main motor is still in the inertial rotation state at this point, the tail rail 6 is wound on the thread gripping portion 12 by stopping the ring rail 1 at a position corresponding to the thread gripping portion 12. When the tail bobbin 6 is wound 1.5 to 2 times around the thread gripping portion 12, the timer TR1 times up and its normally-open contact TR1a is closed, and the electromagnetic contactor MS3 for driving the swing motor is excited and shakes. The moving motor M3 is driven and the ring rail 1 starts rising from a position corresponding to the thread gripping portion 12. On the other hand, the timer TR2 starts counting at the same time as the drive of the swing motor M3, and then the time is up during the ascent of the ring rail 1 and the brake MB for stopping the main motor is activated. Ring rail 1
After the limit switch LS2 is turned off at a time point when the arm has reached a predetermined position (a position above the yarn winding position at the time of restart in this embodiment), the swing motor M3 stops and the lift of the ring rail 1 stops. The machine base is completely stopped. Even when the thread connected to the traveler 10 engages with the thread cutting tooth portion 7 during the ascent of the ring rail 1, the thread gripping portion 12 has the protrusion 12 thereof.
Since a is rotating in the direction opposite to the direction in which the thread is hooked, the thread is not strongly pressed against the thread cutting tooth portion 7 and the thread is not cut.

After the lifting of the ring rail 1 is completed, the doffing device is operated and the doffing work and the pipe replacement work of the empty bobbin insertion are performed. After the pipe replacement work is completed, the machine frame is restarted, the ring rail 1 is again raised from the stop position, and then lowered to the yarn winding start position to start winding the yarn. Mandarin yarn 2 when doffing Mandarin yarn 2
When the yarn connected to the tail bobbin 6 is strongly pressed against the yarn cutting tooth portion 7 to be cut, and the residual yarn after cutting is rotated at the normal rotation speed of the spindle 4 as shown in FIG.
It becomes a state of fluttering along with, and is gradually scattered from the tip end portion thereof and is removed from the yarn gripping portion 12 by the time of the next doffing. The flying cotton dust is sucked and removed by a cleaning device such as a blow cleaner.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, as a means for stopping the swing motor when the ring rail 1 is raised to a predetermined position, the limit switch LS2 is replaced by a timer TR2 and counting is performed simultaneously. Use a timer to start, shorten the length of the thread wound around the thread gripping section 12 to about 1 turn, or raise the ring rail to a position where it directly descends to the thread winding position when the machine is restarted. Good.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the ring rail is moved to a position higher than the cutting tooth portion after the tail thread winding is performed on the thread gripping portion of the spindle base when the machine stand for doffing is stopped. Therefore, the thread from the tail bobbin to the traveler will not be pressed strongly against the thread cutting tooth, so even if a spindle equipped with a thread gripping section with a strong gripping force is used, thread breakage will occur when the machine is restarted. It has an excellent effect that it can be prevented.

[Brief description of drawings]

1 to 3 show an embodiment embodying the present invention. FIG. 1 is a diagram showing changes in spindle rotation speed and position of a ring rail, and FIG. 2 is a control for stopping a machine base. Circuit diagram, FIG. 3 is a side view showing a stop position of the ring rail, FIG. 4 is a diagram showing a spindle rotation speed and a position change of the ring rail when a conventional stop method is adopted, and FIG. 5 is a knurl portion. FIG. 6 is a side view of a conventional device having a spinning machine, and FIG. 6 is a side view of essential parts showing a state of a yarn when a spinning machine equipped with a spindle provided with a protrusion having a direction opposite to a rotation direction at the time of spinning is stopped. FIG. 7 is a schematic plan view showing the relationship between the rotation direction of the thread gripping portion and the residual thread. The ring rail 1, the spindle 4, the tail bobbin 6, the thread cutting tooth portion 7, the traveler 10, the spindle wave 11, the thread gripping portion 12, the protrusion 12a, and the swing motor M3.

Claims (1)

[Claims] 1. A simultaneous doffing machine is provided, and a large number of protrusions whose tips extend in a direction opposite to a rotation direction during spinning are provided between a thread cutting tooth portion provided on a spindle base portion and a spindle warb. In spinning machines such as ring spinning machines and ring twisting machines with thread grips, when stopping for doffing, lower the ring rail to the tail winding position during inertial rotation after the main motor of the spinning machine is demagnetized. After the tail thread is wound around the thread gripping part, the ring rail is raised until the position of the traveler on the ring rail is higher than at least the position corresponding to the thread cutting tooth part, and then the machine base is completely stopped. Stopping method in spinning machine.