EP1120375A1

EP1120375A1 - Bobbin holder, thread winder, thread packagemaking device, thread winding method, and thread packagemaking method

Info

Publication number: EP1120375A1
Application number: EP00949985A
Authority: EP
Inventors: Katsuhiko Ninomiya; Toshihiro Hayashi
Original assignee: Toray Industries Inc; Toray Engineering Co Ltd
Current assignee: Toray Industries Inc
Priority date: 1999-08-04
Filing date: 2000-08-03
Publication date: 2001-08-01
Also published as: KR20010075524A; CN1319069A; TW492945B; WO2001010762A1; JP2001039626A

Abstract

A bobbin holder of a yarn winder includes a holder body, a bobbin holding and handling member, elastic members deformable according to the movement of the bobbin holding and handling member, spacers maintaining the elastic members at predetermined intervals and transmitting the movement of the bobbin holding and handling member to the elastic members, and a cylindrical support member attached to a turret and rotatably supporting a drive shaft. The holder body has a boss portion for connection to the drive shaft and hollow portions to accommodate the bobbin holding and handling member and the cylindrical support member on either side of the boss portion. The boss portion has annular projections extending into the hollow portions. Also, the boss portion has at least one portion in which the amount of increase in the inner diameter of the boss portion (d1) and the amount of increase in the outer diameter of the drive shaft (d2) due to a centrifugal force during rotation satisfies the relationship of (d1 - d2) < 20 µm.

Description

TECHNICAL FIELD

The present invention relates to a bobbin holder capable of satisfactorily winding a yarn at a winding speed no lower than 5000 m/min without causing vibration, a yarn winder having such a bobbin holder, an apparatus for manufacturing a yarn package, a method for winding a yarn, and method for manufacturing a yarn package.

BACKGROUND ART

In general, in the case where a plurality of yarns, which have been spun by a spinning machine, are wound onto a plurality of bobbins held by a bobbin holder, a winder as shown in Fig. 1 is used.
This winder includes two bobbin holders 2 (2a, 2b) rotatably mounted to a turret member which is rotatably arranged in a machine frame 1, traverse devices 4 mounted to a frame member 3 which is arranged to move vertically in the machine frame 1, and a pressure roller 5 rotatably mounted to the frame member 3 or the traverse devices 4 so that the pressure roller 5 is located close to the traverse devices 4.
Other than the above winder, there is provided a winder in which a turret member having bobbin holders mounted thereto moves between a winding position and a waiting position along a rail arranged in a machine frame. Also, there is provided a winder in which one bobbin holder is arranged in a machine frame.
The above described bobbin holder has the shape as shown in Fig. 7. The bobbin holder 2 includes a drive shaft 11, a holder body 12 to which bobbins 100 for winding packages 51 are attached, a bobbin holding and handling member 13 reciprocating at the forward end section, elastic members 14 which are compressed and deformed in the radial direction to hold the bobbins 100, when an axial force acts on them by the movement of the bobbin holding and handling member 13, spacers 15 having functions of maintaining the elastic members 14 at predetermined intervals and transmitting the motion and the force of the bobbin holding and handling member 13 to the elastic members 14 so that the elastic members 14 can be deformed, and a cylindrical support member 10 integrally attached to the turret member 7 for rotatably supporting a drive shaft 11 by bearings 16. The holder body 12 has hollow portions 12a and 12b for accommodating the cylindrical support member 10 and the bobbin holding and handling member 13. The bobbin holding and handling member 13, the elastic members 14 and the spacers 15 are attached to the holder body 12, and the holder body 12 is fitted on and connected to the drive shaft 11 at the boss portion 12c.
The drive shaft 11 has a hole 11a for supplying compressed air, and is connected at one end thereof to a drive motor (not shown in the drawing) via a coupling 19 for rotating the drive shaft 11. The bobbin holding and handling member 13 includes a piston head 17 having a piston section 17a movably attached in the hollow portion 12a formed at the forward end section of the holder body 12 and a cylindrical section 17b movably fitted in the forward end of the holder body 12, and a spring 18 arranged between the piston head 17 and the hollow portion 12a so that the piston head 17 can be normally pushed toward the rear end side (support side) of the holder body 12.
In the above structure in which the drive shaft 11 is fitted in the boss portion 12c of the holder body 12 for connection, when the drive shaft 11 is rotated at a high speed no lower than 5000 m/min, the holder body 12 is expanded as shown by the broken line in the drawing by the influence of a centrifugal force, with the result that the diameter of the hole of the boss portion 12c fitted on the drive shaft 11 is also enlarged as shown by the broken line. Therefore, the following problems may be encountered; for example, if it is planned to ensure a sufficient fitting engagement in the case of rotation of 8000 m/min, it is necessary to provide interference of not less than 20 µm when the winder is stopping, but if this structure is adopted, it is impossible to disassemble the bobbin holder for maintenance. On the contrary, when the fitting engagement is made so that maintenance can be accomplished, and in the case of rotation of 8000 m/min, a large clearance is caused between the holder body 12 and the boss portion 12c of the drive shaft 11 to cause a loose fit condition, so that slippage is caused in the boss portion 12c and vibration is caused, and further, fretting abrasion is caused by the vibration, and it becomes impossible to disassemble the boss portion 12c.
Further, when the yarn is wound by the above described yarn winder, the following problems may be encountered; great vibration is caused because of the slippage of the boss portion 12c, and therefore, a yarn disorder arises and the profile of the yarn package is deteriorated, with the result that the product becomes defective.

SUMMARY OF THE INVENTION

The present invention has been accomplished to solve the above problems, and an object of the present invention is to provide a bobbin holder, which can be easily assembled and disassembled, capable of excellently winding the yarn at a winding speed no lower than 5000 m/min without causing vibration and without causing any fretting abrasion by vibration, capable of obtaining a good looking yarn package, and also of providing a yarn winder having such a bobbin holder, a yarn package manufacturing device, a yarn winding method, and a yarn package manufacturing method.
A bobbin holder of the present invention comprises a drive shaft and a holder body to which a bobbin for winding a yarn thereon is attached, wherein the holder body includes a boss portion, is connected to the drive shaft at the boss portion, and has hollow portions formed on both sides of the boss portion, and the boss section includes a protruding section extending to at least one of the hollow portions at an end of the connecting section with the drive shaft.
Further, a bobbin holder of the present invention comprises a drive shaft and a holder body to which a bobbin for winding a yarn thereon is attached, wherein the holder body includes a boss portion and is connected to the drive shaft at the boss portion, and the boss portion includes at least one portion in which the relationship (d₁) - (d₂) < 20 µm is satisfied where (d₁) is a quantity of increase in the inner diameter of the boss portion by a centrifugal force caused at the time of rotation and (d₂) is a quantity of increase in the outer diameter of the drive shaft.
It is preferable that the yarn winding speed is no lower than 5000 m/min in the bobbin holder.
The yarn winding method, the yarn winder, the yarn package manufacturing apparatus and the yarn package manufacturing method of the present invention are characterized in that the yarn is wound and the yarn package is manufactured using the above described bobbin holder.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present invention will now be explained referring to the attached drawings, in which:
Fig. 1 is a schematic view showing a winder;
Fig. 2 is a schematic view showing an embodiment of a yarn package manufacturing apparatus;
Fig. 3 is a schematic cross-sectional view showing the first embodiment of the bobbin holder of the present invention;
Fig. 4 is a schematic cross-sectional view showing the second embodiment of the bobbin holder of the present invention;
Fig. 5 is a view showing the relationship between the speed and the value (d₁) - (d₂) when the thickness of the projection of the bobbin holder is set at 5 mm and the length of the projection is changed;
Fig. 6 is a view showing the relationship between the length of the projection and the value (d1) - (d2) when the speed of the bobbin holder is set at 10000 m/min and the thickness of the projection is changed; and
Fig. 7 is a schematic cross-sectional view showing a conventional bobbin holder.

BEST METHOD FOR CARRYING OUT THE INVENTION

Fig. 2 is a schematic view showing an embodiment of a yarn package manufacturing apparatus including a yarn winder 6 provided with a bobbin holder 2 of the present invention. The yarn package manufacturing apparatus 50 shown in Fig. 2 includes a spinning machine 20 comprising a metering pump and spinnerets for spinning melt polymers, a first take-up roller 21 for receiving the spun yarns at a predetermined speed, a second take-up roller 22 for receiving the spun yarns, a yarn dividing guide 23, tension sensors 24, swing fulcrum guides 25, and the yarn winder 6.
The yarn winder 6 includes a traverse device 4, two bobbin holders 2 (2a and 2b), a turret member 7 to which the two bobbin holders 2 (2a and 2b) are rotatably attached, and a pressure contact roller 5.
Fig. 3 is a schematic cross-sectional view showing the first embodiment of the bobbin holder 2 of the winder of the present invention. The bobbin holder 2 includes a drive shaft 11, a holder body 12, a bobbin holding and handling member 13 reciprocating at the forward end section, elastic members 14 which are compressed and deformed in the radial direction when an axial force acts on them by the movement of the bobbin holding and handling member 13, spacers 15 having functions of maintaining the elastic members 14 at predetermined intervals and transmitting the movement and the force of the bobbin holding and handling member 13 to the elastic members 14 so that the elastic members 14 can be deformed, and a cylindrical support member 10 integrally attached to the turret member 7 and rotatably supporting the drive shaft 11 by bearings 16. The holder body 12 includes hollow portions 12a and 12b in which the cylindrical support member 10 and the bobbin holding and handling member 13, and the bobbin holding and handling member 13 are disposed; the elastic members 14 and the spacers 15 are attached to the holder body 12, and the holder body 12 is fitted on and connected to the drive shaft 11 at the boss portion 12c.
In the holder body 12, it is necessary that the boss portion 12c and the drive shaft 11 have such an engaging force (interference) that a clearance (rattling) is not caused due to the expansion of the inner circumferential part of the boss portion 12C when the outer circumferential part of the boss portion 12c is radially outwardly expanded by a centrifugal force when the winder is rotated at high speed.
On the other hand, when the bearings 16 of the bobbin holder 2 are replaced, it is necessary to disassemble the holder body 12 and the drive shaft 11, and if the engaging force is too strong (the interference is too large), there may be a problem in that it becomes impossible to disassemble the holder body 12 and the drive shaft 11.
In general, when the holder body 12 and the drive shaft 11 are disassembled, the holder body 12 is heated by a heater, and the drive shaft 11 is pushed out in the axial direction with a hydraulic press, but in order to disassemble the holder body 12 and the drive shaft 11 easily, it is necessary that the interference of the holder body 12 with the drive shaft 11 is not more than 20 µm.
Therefore, at the connecting ends of the boss portion 12c with the drive shaft 11 in the holder body 12, there are provided annular projections 12c-1 and 12c-2 protruding in the axial direction toward and into the hollow portions 12a and 12b formed on both sides of the boss portion. In this connection, either the annular projection 12c-1 or 12c-2 may be provided.
It is necessary that protruding size (L) of the annular projections 12c-1 and 12c-2 is determined to be not less than 0.1 times the inner diameter (d) of the boss portion 12c with which the drive shaft 11 is engaged, and the outer diameter size (D) of the annular projections 12c-1 and 12c-2 is determined to be not more than 2 times the inner diameter size (d) of the boss portion 12c. When the protruding size (L) and the outer diameter size (D) are out of the predetermined size ranges, it is impossible to obtain a necessary engaging force in the case of rotation at high speed, and vibration is caused in the same manner as that of the conventional bobbin holder, and fretting abrasion is caused by the vibration.
In the holder body 12 described above, when the annular projection 12c-1 and 12c-2 are formed so that the protruding size (L) is 10 mm and the outer diameter size (D) is 45 mm where the inner diameter size (d) of the boss portion 12c is 35 mm, even in the case of rotation of 8000 m/min, a high intensity centrifugal force does not act on the outer circumferential part of the annular projection 12c-1 and 12c-2 of the boss portion 12c, and at the same time, the inner diameter part of the annular projections 12c-1 and 12c-2 is not affected by the expansion of the inner diameter part caused when the outer circumferential part of the boss portion 12c is radially expanded, and therefore, even if the interference is not more than 20 µm, the inner diameter of the projections 12c-1 and 12c-2 is seldom changed (a clearance is seldom caused), and accordingly, there is no possibility that a loose fitting engagement occurs. Since no clearance is caused between the boss portion 12c and the drive shaft 11, there is no possibility that great vibration is caused or that fretting abrasion is caused by the vibration and that the connecting parts cannot be disassembled.
In this connection, assuming that the holder body 12 and the drive shaft 11 are respectively and individually rotated, respective changes are considered, as follows; in the holder body 12, the longer the protruding size (L) is extended and the smaller the outer diameter size (D) is reduced, the smaller the change in the inner diameter of the boss portion 12c becomes. Depending on the selected size, it may possibly arise that the inner diameter near the free side end portion of the annular projection is reduced in the case of rotation compared with the case of non-rotation.
On the other hand, the quantity of increase in the outer diameter of the drive shaft 11 is uniformly increased according to the increase in the rotational speed. That is, there is a possibility that the value of difference (d₁) - (d₂) between the quantity (d₁) of increase in the inner diameter of the holder body 12 caused by a centrifugal force in the case of rotation and the quantity (d₂) of increase in the outer diameter of the drive shaft 11 becomes negative.
In the present invention, the quantity of increase in the inner diameter of the boss portion 12c is defined as a change in the inner diameter at a portion where the value of the inner diameter is minimum, and the quantity of increase in the outer diameter of the drive shaft 11 is defined as a change in the outer diameter at a portion where the value of the outer diameter is maximum in the connecting region with the holder body 12.
The following Tables 1 and 2 show the results of numerical analysis, using FEM, on a computer.
Table 1 and Fig. 5 show the relationship between the bobbin speed and the value (d₁) - (d₂) in the case where the thickness t of the annular projections 12c-1 and 12c-2 is set at 5 mm and the length L of the projections section is changed. As can be seen from Table 1 and Fig. 5, the longer the length L of the projections is, the smaller the quantity of increase in the diameter becomes.

((d₁) - (d₂) (µm) in the case of t = 5 mm)

L (mm)

5 10 15 20 25

SPEED 5000 3.68 0.97 0.05 0.23 0.62

8000 9.66 2.58 0.13 0.59 1.62

10000 14.56 3.92 0.20 0.90 2.46

The following Table 2 and Fig. 6 show the relationship between the length L of the projections and the value (d₁) - (d₂) in the case where the speed of the bobbin holder 2 is set at 10,000 m/min and the thickness t of the annular projections 12c-1 and 12c-2 is changed. As can be seen from Table 2 and Fig. 6, the smaller the thickness t of the projections is, the smaller the quantity of increase in the diameter is.

((d₁) - (d₂) (µm) in the case of speed = 10,000 m/min)
	THICKNESS t (mm) OF PROJECTION
	2.5	5	10	15
L (mm)	5	10.70	14.56	17.30	19.06
10	-0.79	3.92	9.24	12.78
15	0.12	0.20	4.24	8.10
20	2.42	0.90	2.56	5.74
25	2.72	2.46	2.66	4.92

As described above, concerning the annular projection the inner diameter of which is seldom changed even in the case of rotation at a high speed, at least one annular projection may be provided in the boss portion 12c, and it is needless to say that the position and the number of the annular projection are not specifically limited.
Here, a portion of the boss section 12c of the holder body 12 other than the projections 12C-1 and 12C-2 is subjected to a strong centrifugal force when the winder is rotated at a speed no lower than 5000 m/min, and does not contribute to the connection of the holder body 12 with the drive shaft 11, and therefore, a recess machining section (large diameter section) 12c-3 is formed in the boss portion 12c, as shown in Fig. 4, so that a clearance can be formed in the case of stoppage of the device, whereby disassembling and assembling can be done more easily. It is possible to form this recess machining on the drive shaft 11 side, or on both the boss 12c side and the drive shaft 11 side.
In the above described embodiment, the motor shaft for rotational drive and the drive shaft 11 of the bobbin holder 2 are connected with each other by the coupling 19, but it is possible to adopt a structure in which the motor shaft and the drive shaft 11 of the bobbin holder 2 are integrated with each other into one body, or a structure in which a shaft for transmitting rotation is arranged between the motor shaft and the drive shaft 11 of the bobbin holder.
Of course, it is possible to apply the structure of the present invention, in which the annular projections 12c-1 and 12c-2 are formed in the holder body 12, to the bobbin holders described in Japanese Unexamined Patent Publication (Kokai) No. 6-1530, No. 8-175753 and No. 4-159969.
As explained above, according to the bobbin holder of the present invention, even when the bobbin is rotated at a rotational speed no lower than 5000 m/min, and interference of the annular rotational member with the boss portion of the drive shaft is not more than 20 µm, there is no possibility that a clearance is increased and a loose fitting is caused, and accordingly, it is possible to prevent occurrence of vibration arising due to slippage at the boss section, it is possible to prevent occurrence of such a case that fretting abrasion is caused by vibration and the boss portion cannot be disassembled.
The yarn package manufacturing apparatus of the present invention comprises a spinning machine for spinning melt polymer, a cooling device (not shown) for cooling the spun polymer to produce yarns, a take-up machine having a take-up roller or the like for receiving the yarns at a predetermined speed, and a winder for winding the yarns, which are delivered from the take-up machine, onto the bobbins attached to the bobbin holder, respectively. In this case, the winder shown in Fig. 1 is used.
Of course, the structure of the above take-up machine and the winder is not specifically limited.
A package was formed with the above described package manufacturing apparatus under the following manufacturing conditions. As a result, it is possible to realize the above effects, and also, it is possible to obtain a good package, the profile of which is excellent, without causing great vibration during winding, and without yarn disorder.
Condition of Package Formation
Polymer: polyester
Kind: 150 denier, 72 filaments
Take-up Conditions
Rotational speed of first take-up roller: 6000 m/min
Rotational speed of second take-up roller: 6000 m/min
Winding conditions
Winding speed: 5920 m/min
Bobbin diameter: 126 mm
Winding width: 123 mm
Winding type: constant helix angle
Helix angle: 6.0 degrees

LIST OF THE REFERENCE NUMERALS

1: Machine frame
2 (2a, 2b): Bobbin holder
3: Frame body
4: Traverse device
5: Pressure roller
6: Winder
7: Turret member
10: Cylindrical support member
11: Drive shaft
11a: Compressed air hole
12: Holder body
12a, 12b: Hollow portion
12c: Boss portion
12c-1, 12c-2: Projection
12c-3: Recess machining section
13: Bobbin holding and handling member
14: Elastic member
15: Spacer
16: Bearing
17: Piston head
17a: Piston part
17b: Cylindrical part
18: Spring
19: Coupling
20: Spinning machine
21: First take-up roller
22: Second take-up roller
23: Yarn dividing guide
24: Tension sensor
25: Swinging fulcrum guide
50: Yarn package manufacturing apparatus
51: Package
100: Bobbin

Claims

A bobbin holder comprising a drive shaft and a holder body to which a bobbin for winding a yarn thereon is attached, wherein the holder body includes a boss portion, is connected to the drive shaft at the boss portion, and has hollow portions formed on both sides of the boss portion, and the boss portion includes a projection extending toward at least one of the hollow portions at an end of the connecting part with the drive shaft.
A bobbin holder comprising a drive shaft and a holder body to which a bobbin for winding a yarn thereon is attached, wherein the holder body includes a boss portion, and is connected to the drive shaft at the boss portion, and the boss portion includes has at least one portion in which the relationship of (d₁) - (d₂) < 20 µm is satisfied where (d₁) is a quantity of increase in the inner diameter of the boss portion due to centrifugal force caused at the time of rotation and (d₂) is a quantity of increase in the outer diameter of the drive shaft.
A yarn winder comprising a bobbin holder according to claim 1 or 2.
A method for winding a yarn, wherein a yarn is wound using a yarn winder according to claim 3.
A method for winding a yarn according to claim 4, wherein the yarn is wound at a winding speed no lower than 5000 m/min.
An apparatus for manufacturing a yarn package comprising a yarn winder according to claim 3.
A method for manufacturing a yarn package wherein a yarn package is formed on a bobbin by a yarn winding method according to claim 4 or 5.