JPH0699849B2 - Rewinding method in pot type spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention winds a yarn fed from one end of a yarn guiding tube that moves forward in a pot rotating at a high speed along its axis into the pot. The present invention relates to a rewinding method in a pot spinning machine.

(Prior Art) Generally, in this type of spinning machine, when the wound yarn wound on the inner surface of the pot (package in the pot) is taken out from the pot, the center of rotation of the pot is in the state where the pot rotates at the same speed as during spinning. It is rewound as a rewinding package on the bobbin arranged in.

(Problems to be solved by the invention) When the wound yarn is wound around the bobbin, a larger tension tends to be applied to the yarn than during spinning, and the rotational speed of the pot during winding is the same as the speed during spinning. When the rewinding is continued with, the yarn breakage is likely to occur, there is a disadvantage that the processing after the yarn breakage takes time and the yarn is wasted, and in order to eliminate the above-mentioned inconvenience, It has also been proposed to carry out rewinding in a state in which the rotational speed of is lower than the rotational speed during spinning. However, in all of these conventional methods, since the rotational speed of the pot during rewinding is constant, the tension applied to the yarn during rewinding is small at the start of rewinding and increases as it approaches the end of rewinding. Therefore, the rewound package formed on the bobbin has a problem that the inner layer is soft and the outer layer is wound more tightly, so that the package easily loses its shape.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a yarn wound in a rotary pot (a package in the pot) is inserted in an axial center portion of the pot. When rewound on the core, the rotational speed of the pot decreases as the winding tension approaches the end of rewinding rather than the start of rewinding so that the winding tension for the yarn is constant or the tension on the outside of the package formed by rewinding becomes weak. The method of changing gears is adopted.

(Operation) In the present invention, when the package in the pot is rewound,
The tension on the yarn wound on the bobbin is constant or decreases as it approaches the end of winding. The rewound package formed on the bobbin is wound from the inner layer to the outer layer with a uniform tension or with a lower tension in the outer layer, so that it is formed into a predetermined shape without losing its shape.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a support rail 2 is disposed below the draft part 1, and the support rail 2 is vertically arranged at a lower position corresponding to the front bottom roller 3a and the front top roller 3b of the draft part 1. The support cylinder 4 is fixed in an extended state, and a pot 5 is rotatably supported via a bearing 7 on the outer periphery of the lower portion of the support cylinder 4 with its bottom wall 6 facing upward, and is integrated with the pot 5. The drive belt 9 that is in contact with the pulley 8 that is formed on the upper side of the drive belt 9 drives the pulley 8 to rotate at high speed. Bottom wall 6 of pot 5
An elastic body 6a is fixed to the.

The front bottom roller 3a and the front top roller 3b
A false twisting nozzle 10 is arranged near the lower part of the false twisting nozzle 10
A guide tube 12 for guiding the yarn Y to the pot 5 is connected to the lower part of the. A yarn guide tube 13 that guides the yarn Y into the pot 5 and guides the yarn Y so that the yarn Y is wound around the inner surface of the pot in a state where it can be easily rewound is loosely inserted into the support cylinder 4 and is guided by the guide. A support arm 14 arranged so as to cover the pipe 12 and moved up and down by a driving device (not shown).
And is reciprocated between a position shown by a chain line and a position shown by a solid line in FIG. Also, the pot 5
Is covered by a cover 16 fixed to the bracket 15.

A pneumatic clearer 17 is arranged in the vicinity of the front bottom roller 3a, and the pneumatic clearer 17 is equipped with a solenoid valve 18, and the operation of the solenoid valve 18 controls the intake action from the intake port. It is like this. In addition, a solenoid valve is also installed in the pipe 19 that supplies compressed air to the false twist nozzle 10.
Equipped with 20.

Below the pot 5, a rotation center 22a for taking out the winding yarn (the package P1 in the pot) wound in the pot 5 is provided.
A doffing device 21 that moves up and down together is disposed, and a bobbin support cylinder 23 supports a mounting shaft portion 23a thereof at one end of a rotatable support bracket 22 of the doffing device 21 as shown in FIGS. It is slidably inserted in a state orthogonal to the bracket 22,
Stop ring 23c fixed to the protruding end of the mounting shaft 23a
And a spring 24 interposed between the bobbin support cylinder 23 and the support bracket 22 so as to be urged upward. At the tip of the bobbin supporting cylinder 23, the pressing member 25 is a bearing.
It is rotatably supported via 25a. A suction hole 23b is formed in the mounting shaft portion 23a of the bobbin support cylinder 23, and is connected to a flexible tube 27 which communicates with an intake source (not shown) and has an electromagnetic valve 26 in the middle thereof.

The drive belt 9 is driven by a drive motor M driven via an inverter whose frequency setting can be changed. The inverter is controlled by the control device 28, and at the time of rewinding, the drive signal is input through the variable resistor VR2 different from the variable resistor VR1 for setting the rotation speed of the pot during spinning. The variable resistor VR2 connected to the circuit that outputs the drive signal to the inverter at the time of rewinding is used from the time when the predetermined pot package P1 is formed in the pot 5, and the speed of the drive motor M continuously decreases. It is designed to operate.

Next, the operation of the device configured as described above will be described. At the start of spinning, the intake of the pneumatic clearer 17 is stopped, compressed air is supplied to the false twist nozzle 10, and the pot 5 is driven to rotate at high speed by the drive belt 9, and the fleece F is sent out from the draft part 1. Then, twisting is applied by the whirling airflow of the false twisting nozzle 10, and the twisted state is sent out into the pot 5 through the guide tube 12 and the yarn guiding tube 13. The yarn coming out of the pot 5 comes into contact with the inner wall surface of the pot 5 due to the air flow, and as soon as it comes into contact with the pot 5, it is rotated with the pot 5 and is pressed against the inner wall of the pot 5 by the centrifugal force of the yarn itself. And front bottom roller 3a, front top roller
The fleece F fed from 3b is actually twisted by the high speed rotation of the pot 5, and is wound around the inner surface of the pot 5 as a yarn Y. After the real twist is applied to the fleece F by the rotation of the pot 5, the solenoid valve 20 is closed to stop the supply of compressed air to the false twist nozzle 10 and the solenoid valve
18 is opened and the intake of the pneumatic clearer 17 is started, and the area around the front bottom roller 3a is cleaned and the normal spinning state is established. Since the yarn guide tube 13 is moved up and down while penetrating the bottom wall 6 of the pot 5, the yarn Y sent from the lower end of the yarn guide tube 13 into the pot 5 is a package in the pot in which the inner wall of the pot 5 does not lose its shape. Form P1.

When the spinning is continued and a predetermined amount of the yarn Y is wound on the inner wall of the pot 5 to form the in-pot package P1, the inverter is controlled by the controller 28 via the variable resistor VR2 for controlling the winding time. It As a result, the rotation speed of the pot 5 gradually decreases as shown in FIG. On the other hand, the support bracket 22 is driven by a drive mechanism (not shown) at the same time when the yarn Y is wound by a predetermined amount.
When the pressing member 25 attached to the upper end of the bobbin supporting cylinder 23 is moved up to a position where it is pressed by the elastic body 6a of the bottom wall 6 of the pot 5, as shown in FIG. Is stopped and held in that position. The spring 24 absorbs the difference in momentum between the pressing member 25 and the elastic body 6a after the support bracket 22 or the bobbin supporting cylinder 23 stops moving upward. Yarn Y being spun, that is, yarn guide tube 13
When the yarn Y connected to the in-pot package P1 from the tip of the pot is gripped between the elastic body 6a and the pressing member 25, the in-pot package P1 formed in the pot 5 is rotated by the pot 5 so that the bobbin supporting cylinder is rotated. It is rewound on the bobbin T fitted in 23. From the moment when the yarn Y being spun is held between the elastic body 6a and the pressing member 25, the fleece F sent from the front bottom roller 3a and the front top roller 3b is not twisted, and the fleece F becomes the pneumatic clearer 17. Sucked. Further, the electromagnetic valve 26 is opened to start the suction action on the yarn guiding tube 13 through the suction hole 23b, and from the portion gripped by the elastic body 6a and the pressing member 25 to the yarn guiding tube 13 through the yarn guiding tube 13. The yarn that does not yet have sufficient twist is sucked into the bobbin support cylinder 23 by the suction action from the suction hole 23b of the bobbin support cylinder 23 and is rotated around the gripping point. Since this rotation direction is the untwisting direction of the yarn Y, the yarn Y is easily cut near the gripping point and sucked and removed through the flexible tube 27. The distance from the rotation center of the pot 5 to the inner surface of the winding package P1 (radius ) Is the smallest at the start of rewinding, and becomes larger as it approaches the end of rewinding. Therefore, if the rotation speed of the pot is constant, the tension acting on the yarn that is rewound on the bobbin T and that is continuous with the in-pot package P1 is small at the start of rewinding and increases toward the end side. The shape of the package P2 may be lost when the package P2 is formed, but in this device, the revolving speed of the pot 5 gradually decreases from the start of rewinding as shown in FIG.
The tension acting on is constant or becomes weaker on the outer side, and unlike the conventional case, the rewind package P2 is smoothly formed without losing the shape of the rewind package P2 during rewind.

At the time when the rewind package P2 is formed on the bobbin T,
When the support bracket 22 starts to descend and the support bracket 22 ends to descend, the bobbin support cylinder 23 inclines with respect to the rotation axis of the pot 5 as shown by the solid line in FIG. The rewinding and the bobbin T are easily held. In this state, the bobbin T on which the rewinding package P2 is formed is removed from the bobbin supporting cylinder 23 by a hand or an automatic machine, and an empty bobbin T is mounted.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, a pair of cones is used as a means for continuously changing the rotation speed of the pot during winding instead of driving the drive motor M through an inverter. A speed change mechanism including a drum and a belt wound between both cone drums may be used. Further, the rotation speed of the pot 5 may be changed to each stage instead of continuously.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the tension applied to the rewinding yarn at the time of rewinding the package in the pot is constant from the start of rewinding to the end of rewinding or from the start of rewinding to the end of rewinding. Since it becomes smaller gradually, the shape of the package does not collapse when forming the rewind package unlike the conventional one, and the package is deformed smoothly when the rewind package is removed from the bobbin support cylinder. In addition, when the rewound package is rewound and wound up into the package, a yarn breakage or the like due to the deformation of the package does not occur.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a pot spinning machine embodying the present invention, and FIG. 2 is a sectional view showing a tip portion of a bobbin supporting cylinder.
FIG. 3 is a block circuit diagram for motor drive control, and FIG.
The figure is a diagram showing changes in the rotational speed of the pot at the time of rewinding, and FIGS. 5 to 8 are partially cutaway front views showing the action during doffing work. Draft part 1, pot 5, yarn guide tube 13, doffing device 21,
Bobbin support cylinder 23, thread Y, bobbin T, package in pot
P1, rewind package P2.

Claims (2)

[Claims] Claim: What is claimed is: 1. A pot-type spinning machine for winding a yarn fed from one end of a yarn guide tube that reciprocates along the axis of the pot that rotates at a high speed into the pot. When rewinding on the winding core inserted in the shaft center of the pot, the pot is rewound from the start of rewinding so that the tension on the yarn is constant or the tension on the outside of the package that can be rewound is weakened. A rewinding method in a pot-type spinning machine in which a variable speed drive is performed such that the speed decreases as it approaches the end. 2. The winding in the pot-type spinning machine according to claim 1, wherein the speed change of the rotation speed of the pot is started based on a winding completion signal of a predetermined amount of spun yarn into the pot. How to return.