JP2889043B2 - Cutting method of lap wound yarn at bobbin end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a wrapped yarn produced when a transfer tail is formed at the end of a bobbin, particularly at the end of a paper tube.

[0002]

2. Description of the Related Art In recent years, when a synthetic fiber yarn such as polyamide or polyester fiber is processed by a draw twisting machine, a draw false twisting machine, or the like, a yarn end at the beginning and an yarn end at the end between the original yarn bobbins. At the beginning of the winding, a so-called transfer tail is formed at the end of the bobbin outside the traverse area in order to carry out continuous processing (Japanese Patent Publication No. 57-157).
36233, JP-A-58-119553).

[0003] The yarn package thus wound up
In order to facilitate the transfer tail, the bunch wound (pigtail) or pigtail formed at the end of the bobbin leaving a transfer tail of a predetermined length was peeled off and peeled off. The later yarn end is fixed to the bobbin end with a tape, a label, a seal (paper) or the like.

Conventionally, such a thread end stripping process has been performed manually, but such a process requires a large number of people and time, and it is difficult to stably obtain a product that is soiled or of uniform quality. There was a problem.

[0005] For this reason, mechanization and automation have been attempted recently, and as described in JP-A-60-112570, a bunch winding at a bobbin end is scraped off by a scraping hand provided on a robot. Has been proposed.

[0006] However, recently, when the bobbin is reused, if the bobbin is provided with a slit for threading at the end of the bobbin, a thread enters the slit. Not only is there a problem that the yarn at this portion is difficult to remove and remains broken, but also there is a drawback that the bobbin itself is damaged. For this reason, there is a major drawback that the product quality is not sufficient and cannot be reused.

To compensate for this disadvantage, Japanese Patent Laid-Open Publication No.
As disclosed in Japanese Patent Publication No. 0, there has been proposed an apparatus in which a bunch portion is cut off at an end of a bobbin with an electric heater and stripped along a bobbin slit.

However, in this method, when the bunch portion at the end of the bobbin is cut or blown off by the electric heating heater, a fusing or cutting mark is left at the end of the bobbin. Not. Also, a method has been proposed in which a slit is formed in the bobbin end in the bobbin axial direction in order to make it easier to scrape off the bunch portion at the end of the bobbin (JP-A-52-108330, JP-A-1-108330).
No. 203175), which is for manual work, and has a problem that it is difficult to position the slit position and the cutting machine when it is performed automatically.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to cut a bunch winding formed at an end of a bobbin reliably and quickly without damaging the bobbin. .

[0010]

According to the present invention, there is provided a method of cutting a wrapped yarn formed at the end of a bobbin at the time of yarn switching. A thread package is formed using a bobbin provided with a slit or a dent in the direction, the package is inserted into a bobbin holder connected to a driving means, rotated, and a dent installed near the bobbin end is provided. After detecting the dent position by the detector, the cutting device arranged at the front position of the bobbin is cut along the bobbin axis direction from above or from the side of the overlapping wound yarn on the dent position, and at the same time, the two yarn ends of the cut yarn Is a method for cutting a lap wound yarn at the end of a bobbin characterized by suction-holding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic perspective view of a device suitable for carrying out the present invention, and FIGS. 2 (a) and 2 (b) are operation explanatory diagrams.

In FIG. 1, reference numeral 1 denotes a tray for transporting a package, a substrate 2, a support column 3 projecting upright on the substrate 2,
The package includes a package holder 5 and the like provided via a pedestal 4 attached to the support column 3.

The package retainer 5 is provided with a bobbin holder 6 which is rotatably held by a bearing fixed to the pedestal 4 and has a chuck claw for gripping the package from the inner surface.

A conical hollow joint is formed at the rear end of the bobbin holder 6 located on the rear side of the retainer 5, and is connected to a drive connector of a servo motor, which will be described later. It is as if the rotation is done.

When the package P fixed to the tray 1 is sent to a predetermined position by the conveyor 7, the positioning stopper rises to stop the tray 1, so that the package P is accurately positioned. . The bobbin is formed with a slit or a dent S for preventing damage when cutting the wrapped yarn B in the axial direction at the back side position where there is no slit for threading in the circumferential direction. It is preferably used because the thread cut into the slit when removing the winding thread B can be removed reliably and easily.

Two yarn suction devices 8 are arranged to face each other at left and right positions on the front surface corresponding to the yarn package P at the tray stop position. The suction device 8 is provided with an arm (not shown) provided so as to be able to move forward and backward by a moving means such as a fluid pressure cylinder or a motor in a direction along the end face of the package P via a plate 9. Attached to.

A servomotor 10 as driving means for the package P is provided on the rear surface of the stop position.
At the tip of the servo motor 10, there is provided a drive coupler 11 mounted so as to be movable in the axial direction by a shaft joint such as a spline shaft. When the tray 1 stops, the drive coupler 11 is moved in the tray direction. Hydraulic cylinder-1 to be moved to
2, the drive coupler 11 is moved in the axial direction of the drive shaft, and its conical tip is connected to the hollow rear end of the bobbin holder 6. Thus, the package P held by the bobbin holder 6 is made rotatable.

At the front of the servomotor 10, a rotary disk including a gear-shaped rotary disk with a notch on the outer periphery and a light-emitting body (magnetic type or the like) for applying light to the disk is provided. An angle detector (rotary encoder) 13 is provided, and is linked with a distance sensor 14 disposed above a position corresponding to the front end of the bobbin of the package P.

The distance sensor 14 is supported via a bracket 15 and is fixed at a corresponding position for detecting a depression S in the bobbin axial direction. The sensor
14 may be fixed at a fixed position, or may be attached to a movable body and move to a predetermined position on the bobbin as required.

In this case, the operation sequencer 16
When a command is given to the motor driver 17, the package P is rotated by driving the servomotor 10 (usually one rotation). At -14, the bobbin B rotates along the circumferential direction. When the bobbin B reaches the slit position, a distance longer than the reference plane by the depth of the depression S is detected. By comparing the detection signal at this time with the rotation amount of the package P measured by the rotation angle detector 13, the position where the depression S engraved on a part of the circumference of the bobbin end exists is determined. It can be detected quickly and accurately. Thereafter, the mower S is moved so that the depression S corresponds to a position facing the cutter 18 provided at the front position of the stop position.
The rotor 10 rotates and stops at the point where the two positions match.

In this case, when the stop position of the package P detected by the depression S of the distance sensor 14 and the position of the cutter 18 are arranged so as to be aligned with each other, the rotation angle detector 13 is particularly necessary. is not.

The cutter 18 has a cutting edge directed downward,
It is attached to the fluid pressure cylinders 19 and 20 so as to be able to move forward and downward. When the cutter 20 moves forward toward the package P by the operation of the cylinder 20 and its cutting edge moves to the upper part of the cutting position. As shown in FIG. 2A, the cutting edge is lowered by the cylinder 19 to cut the overlapped yarn B. As shown in FIG. 2 (b), the cutting edge cuts only the thread without contacting the bobbin due to the depression S, and does not damage the bobbin at this time. Prior to this cutting, the two suction devices 8 move and are located on both sides of the cutting position of the overlapped yarn B, and the cut yarn end is instantly sucked by the suction device, so that the cut yarn is cut. The strip ends do not weld to the product, bobbin, etc.

Thereafter, the suction device is retracted, the overlapped yarn separated by the peeling chuck is removed, necessary processing is performed, and the instruments return to the original position, and the operation of removing the overlapped yarn is completed. Next, the tray on which the package to be processed is placed is replaced, and the same operation is repeated.

The cutting device is preferably of an electrothermal fusing type having a knife-shaped edge so that the tip is hardly affected by scum, but a cutting knife or an ultrasonic cutter type can also be used. Needless to say.
In addition, a plurality of distance sensors may be used in parallel or separated from each other in order to prevent an error, deformation of a bobbin or the like, malfunction due to a damaged portion, and the like, and perform reliable and accurate detection.

[0025]

As described above, according to the present invention, the unnecessary portion of the wrapped yarn generated at the time of winding can be cut reliably, quickly and easily without damaging the bohin. Has a remarkable effect that can be efficiently reused.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an apparatus suitable for carrying out the present invention.

FIG. 2 (a) is an operation explanatory view of the present invention. (B) It is operation | movement explanatory drawing of this invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tray 5 Package holder 6 Bobbin holder 8 Thread suction device 10 Servo motor 11 Drive coupling device 14 Distance sensor 18 Cutting device B Overlapping thread S Depression

Claims (1)

(57) [Claims] 1. A method of cutting a lap wound thread formed at an end of a bobbin at the time of thread switching, wherein a bobbin provided with a slit or a dent in an axial direction of the bobbin at an end of the bobbin on which the lap spool is formed. To form a yarn package,
The package is inserted into a bobbin holder connected to the driving means and rotated, and after detecting the dent position by the dent detector installed near the end of the bobbin, the cutting device arranged in front of the bobbin is moved to the dent position. Cutting the two yarn ends of the cut yarn at approximately the same time as cutting along the bobbin axis direction from above or from the side of the overlapped yarn.