JPH0357010B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention involves winding tape, band-shaped film, band-shaped sheet, etc. (original material: collectively referred to as tape in this specification) onto a cylindrical core (paper tube). This invention relates to a tape winding device.

(Prior Art) In this type of tape winding device, a plurality of core holders are provided on a common rotating shaft, and a tape is wound around a core held by each core holder. Each core holder is connected to the rotating shaft via a frictional connection. This friction connection is intended to prevent rotational force exceeding a predetermined value from being transmitted from the rotating shaft to the core holder.If a strong counter-rotational resistance force is applied to a particular core from the tape during winding, the It is possible to prevent slippage from occurring in the frictional connection portion of the core and an increase in the winding force (tension) applied to the tape.

Conventional examples of such a structure are described in Japanese Utility Model Application No. 172247/1982 and Japanese Patent Application Laid-open No. 108648/1989.

In the structure of Utility Model Application Publication No. 55-172247, the holder part is constructed by alternately providing a plurality of non-rotatable collars and a plurality of rotatable core holders with respect to the rotating shaft, and the axial direction is By applying force, each collar and core holder are brought into pressure contact.

In the structure disclosed in Japanese Patent Application Laid-open No. 56-108648, each core holder is composed of an assembly of an outer circumferential wall and both end walls made of separate parts, and both end walls are pressed against a fixed collar on a rotating shaft by air pressure. It is designed to be connected.

(Problem to be solved by the invention) However, in the structure of Utility Model Application No. 55-172247, since the axial force is applied to the entire holder part from one end, the axial direction of each part is Due to variations in frictional force, etc., there is a difference in the frictional force in the rotational direction between the core holder located at the end and the core holder located at the middle, and there is a possibility that the tape cannot be wound with uniform force.

Moreover, not only the core holder but also the collar must be attached so as to be movable in the axial direction with respect to the rotating shaft, making the overall structure complicated. Also, the mechanism for holding the core is driven by air pressure,
As described above, since the overall structure is complicated, it is difficult to sufficiently improve the airtightness of the seal portion, and air leakage is likely to occur.

Furthermore, since the entire core holder and collar are in pressure contact with each other, if the rotating shaft is bent,
The end face of the core holder and the end face of the collar come into pressure contact with each other in an inclined state, and as a result, there is a possibility that the pressure contact force may be inconsistent and the winding force may not be equalized.

On the other hand, in the structure of JP-A-56-108648,
Each core holder has its own built-in air cylinder mechanism, and is designed to press into contact with the collar without being affected by other core holders. Therefore, compared to the case where a common force is applied to the entire core holder part as described above, variations in the pressure contact force of each core holder part can be controlled.

However, in this structure, it is necessary to construct the core holder by assembling the outer circumferential wall portion and both end wall portions, which are separate parts, in an airtight state, which results in a complicated structure.

Moreover, since each core holder is in pressure contact with the collars on both sides, in other words, the core holder is in pressure contact with each collar from both sides, the bending of the rotating shaft causes the pressure contact surface of the core holder and the pressure contact surface of the collar to be relatively If it is tilted, the pressure contact force will be inconsistent, and there is a possibility that the winding force cannot be made uniform.

(Means for Solving the Problems) The present invention has a plurality of collars 2 having cylindrical portions 16 protruding in one direction in the axial direction on the inner circumference thereof, which are fixed to the outer circumference of the rotating shaft 1 at intervals in the axial direction. An annular friction block 3 disposed between adjacent collars 2, 2 has a cylindrical outer circumferential wall 20, and first and second friction blocks protruding radially inward from both ends of the outer circumferential wall 20.
are integrally provided with the annular end walls 21 and 22 of the first
The inner periphery of the end wall portion 21 is fitted to the outer periphery of the rotating shaft 1, and the inner periphery of the second end wall portion 22 is fitted to the outer periphery of the cylindrical portion 16 in an airtight manner so as to be slidable, thereby forming both end wall portions 21. ，
The pressure-receiving area of the first end wall 21 facing the air chamber 30 formed between 22 and inside the outer peripheral wall 20 is set larger than the pressure-receiving area of the second end wall 22. 21 and the collar 2 are pressed against each other in the axial direction by end surfaces facing each other in the axial direction to form a friction coupling part 10 that can be coupled in the circumferential direction by friction, and an air pressure supply control passage is connected to the air chamber 30,
A cylindrical lug 6 for holding an annular tape winding core 5 is installed around the friction block 3 in a radial through hole 35 formed in the outer peripheral wall 20 facing the air chamber 30 in an airtight state. This is a tape winding device characterized in that the two are fitted with each other.

(Function) According to the above configuration, the force applied from the pressurized air in the air chamber is greater on the first end wall than on the second end wall, so each friction block is arranged with the first end wall at the top. The first end wall is moved in the axial direction and is connected to the collar in pressure contact. That is, each friction block presses against the collar only on one side. Further, this pressure contact state is not substantially affected by the pressure contact state of other friction blocks or collars.

Therefore, even if the shaft is bent, the relative positions and postures of the individual collars and the friction blocks in pressure contact with them will not be distorted.
The pressure contact force between the two is maintained at a predetermined value, and the frictional force of the pressure contact portions of each part of the device is made uniform.

(Example) FIG. 1 is a partial cross-sectional view of an example, and FIG. 2 is a cross-sectional view taken from FIG. 1. In FIG. 1, a rotating shaft 1 is supported by a bearing (not shown) and is rotated by a suitable drive mechanism. Around the rotating shaft 1, a plurality of fixed collars 2 and friction blocks 3 are arranged alternately in the axial direction. A cylindrical core 5 is mounted around the friction block 3. The core 5 is a member for winding a tape (not shown) around its outer circumference, and the lugs 6
It is removably held in a stable state by the friction block 3. The lug 6 is built into each friction block 3 and is driven by an air cylinder mechanism 7 and a return spring 8 inside the friction block 3.

The end face of each friction block 3 on the right side in FIG. Also, the left end face of each friction block 3 has a slight gap 1 with respect to the end face of the fixed collar 2 facing it.
1 is formed. The air cylinder mechanism 7
As will be described later, in addition to driving the lug 6, it is also configured to push the friction block 3 in the direction of arrow F to maintain the frictional connection portion 10 in a pressed state (connected state).

The fixed collar 2 has a flange-shaped annular portion 15
and a cylindrical portion 16 protruding from its inner periphery in the direction of arrow F.
It is equipped with both. The annular portion 15 is fixed to the rotating shaft 1 by radial bolts 17. The cylindrical portion 16 has an annular groove on its inner peripheral surface, and an O-ring 18 attached to the annular groove is fitted to the outer periphery of the rotating shaft 1 in an airtight manner.

The friction block 3 has a cylindrical outer peripheral wall portion 2.
0 and annular end walls 21 and 22 protruding radially inward from both ends thereof. The first end wall part 21 on the side of arrow F has a small inner diameter, and can freely slide in the circumferential direction and axial direction on the outer peripheral surface of the rotating shaft 1 in an airtight state via an O-ring 23 fitted with an annular groove on its inner periphery. is fitted. Note that a thin cylindrical low friction coefficient member 25 made of resin or the like is interposed between the O-ring 23 and the rotating shaft 1. In addition, the groove on the inner circumference of the first end wall 21 to which the O-ring 23 is attached is open to the adjacent fixed collar 2, and a thin annular material with a low coefficient of friction such as resin is also used between the seal 23 and the fixed collar 2. Part 2
6 is interposed.

The other second end wall portion 22 has a large inner diameter, and is airtightly connected to the outer circumferential surface of the cylindrical portion 16 via an O-ring 24 attached to an annular groove on the inner circumference and a low friction coefficient member 27 similar to the member 25 described above. They are slidably fitted in the circumferential and axial directions.

The air chamber 30 (pressurizing chamber) of the air cylinder mechanism 7 is located between both end walls 21 and 22 and between the outer peripheral wall 20.
is formed radially inside. The air chamber 30 is connected to a passage 32 via a radial passage 31 provided in the rotating shaft 1 . The passage 32 is provided at the center of the rotating shaft 1 and is connected to a pressurized air source via an external air pressure supply control passage (not shown), an air pressure adjustment mechanism, and the like.

The lug 6 is a cylindrical member having a circular cross section, and is inserted into a circular through hole 35 provided in the outer peripheral wall portion 20.
They are slidably fitted in an airtight manner via a ring. A large number of concave and convex portions 36 extending in parallel are provided on the distal end surface of the lug 6 (the end surface on the opposite side to the air chamber 30). The uneven portion 36 extends perpendicularly to the rotation direction of the friction block 3, and
6, the lug 6 firmly holds the core 5 in a relatively non-rotatable state.

The hole 35 has the width of the air chamber 30 (the end walls 21, 2
2). The lug 6 has a base end 37 having a larger diameter than the hole 35. This proximal end 37 enters the air chamber 30 and prevents the lug 6 from slipping outward from the air chamber 30.

As shown in FIG. 2, the lug 6 is integrally provided with a plate-shaped convex portion 38 projecting from the end surface of the base end portion 37. As shown in FIG. The convex portion 38 extends in a direction intersecting the return spring 8,
A longitudinally intermediate portion of the return spring 8 is fitted into a hole provided in the convex portion 38 in a substantially tight state.

Four return springs 8 are provided for each friction block 3, and are generally arranged in a rectangular shape along the circumferential direction of the friction block 3 as a whole. Both ends of each return spring 8 fit into a narrow annular groove 40 provided in the inner peripheral surface of the outer peripheral wall 20.

Next, the operation of the illustrated embodiment will be explained.

When the air pressure in the air chamber 30 is released, the return spring 8 moves the lug 6 toward the rotating shaft 1 side.
In this state, the core 5 is attached around the friction block 3.

Next, pressurized air is supplied from the external passage to the air chamber 30 via the passages 32 and 31. This applies air pressure to the end surface of the base end portion 37, causing the lugs 6 to move radially outward and firmly hold the inner periphery of the core 5.

Also, when the air chamber 30 is pressurized, the end walls 21 and 22
An axial force is applied to the inner surface (pressure receiving surface) of the The inner diameter of the first end wall 21 is smaller than that of the second end wall 22, and the pressure receiving area of the first end wall 21 is smaller than that of the second end wall 22.
2, the force applied to the first end wall 21 is greater than that applied to the second end wall 22.
For this purpose, the friction block 3 as a whole is pushed in the direction of the arrow F, and the friction coupling part 10 becomes connected. When the rotating shaft 1 is rotated in this state, the friction block 3 and the core 5 are also rotated, and the tape is wound around the core 5.

In this winding operation, if the force required for winding the tape (resistance force in the counter-rotational direction from the tape) increases abnormally due to variations in tape thickness, etc., slipping will occur in the friction coupling part 10. A force corresponding to the above-mentioned resistance force (abnormally large rotational force) is not transmitted from the fixed collar 2 to the friction block 3. Therefore, a tension exceeding a predetermined value is not applied to the tape, and no abnormal elongation or the like occurs in the tape.

Furthermore, since the lugs 6 are prevented from rotating in the circumferential direction by the return springs 8, the uneven portions 36 will not be misaligned in the direction, and the core 5 will always be reliably held by the lugs 6.

(Effects of the Invention) As explained above, according to the present invention, each friction block 3 incorporates an independent air cylinder mechanism 7, and is fixed without being influenced by other friction blocks 3, etc. It is designed to come into pressure contact with collar 2. Therefore, variations in the pressure contact force of each friction block 3 can be prevented, and the winding force can be made uniform.
The difference in the pressure-receiving areas of the friction blocks 1 and 22 generates an axial pressing force on each friction block 3, so each friction block 3 can be constructed from a single component. Therefore, the structure of the friction block 3 itself and the seal structure can be simplified, and air leakage can be sufficiently prevented.

Moreover, each friction block 3 is connected to one of the first
Since only the end wall portion 21 is in pressure contact with the fixed collar 2, even if the rotating shaft 1 is bent and the fixed collar 2 is tilted relative to another fixed collar 2, the frictional connection portion 10 can absorb this effect. I won't receive it. Therefore, the pressure contact force of each frictional connection part 10 can always be kept at a predetermined value, and the winding force can be made uniform.

In the present invention, a cylindrical portion 16 protruding in one direction in the axial direction is provided on the inner circumferential portion of the collar 2, and the inner circumference of the first end wall portion 21 is placed on the outer circumference of the rotating shaft 1, and the second end wall portion 2
Since the inner periphery of 2 is slidably fitted to the outer periphery of the cylindrical portion 16 in an airtight manner, the air chamber 30
The pressure-receiving area of the first end wall 21 facing is larger than the pressure-receiving area of the second end wall 22, and by simply supplying air pressure to the air chamber 30, due to the difference in the pressure-receiving area of both end walls 21 and 22. , the friction block 3 can be driven in the axial direction. Also, the outer peripheral wall portion 20
A cylindrical lug 6 is inserted into the radial through hole 35 drilled in the
Since they are fitted in a sealed state, when air pressure is supplied to the air chamber 30, the lugs 6 protrude outward and bite into the inner surface of the core 5, so that the core 5 can be held securely.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of the embodiment, and FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1. 1... Rotation axis, 2... Color, 3... Friction block, 5... Core, 6... Lug, 10...
...Friction connection part, 20...Outer peripheral wall part, 21...First
End wall part, 22... second end wall part, 30... air chamber,
33...Air pressure supply control passage.

Claims (1)

[Claims] 1 Cylindrical part 16 protruding in one direction in the axial direction on the inner circumference
A plurality of collars 2 having a
An annular friction block 3 disposed between the two has a cylindrical outer peripheral wall 20, and first and second annular end walls 21 and 22 protruding radially inward from both ends of the outer peripheral wall 20. are integrally provided, and the first end wall portion 2
1 to the outer periphery of the rotating shaft 1, and the second end wall portion 22
An air chamber 30 is formed between the end walls 21 and 22 and inside the outer peripheral wall 20 by fitting the inner periphery of the inner periphery to the outer periphery of the cylindrical portion 16 so as to be slidable in an airtight manner.
The pressure-receiving area of the first end wall 21 facing is set larger than the pressure-receiving area of the second end wall 22, and the end surfaces of the first end wall 21 and the collar 2 facing each other in the axial direction allow A friction connection part 10 is formed which can be connected by pressure in the circumferential direction by friction, and an air pressure supply control passage is connected to the air chamber 30. A tape winding device characterized in that a cylindrical lug 6 for holding an annular tape winding core 5 around a friction block 3 is fitted in a through hole 35 in an airtight manner.