JPH0460906B2 - - 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). The present invention is directed to a tape winding device for use in the industry, and relates to a structure for attaching a lug for holding a core to a friction block in such a 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 attached to each core holder. The core is also held by lugs built into the core holder. Examples of such lug mounting structures are Utility Model Application No. 55-172247 and Japanese Patent Application Publication No. 56
-Described in No. 108648.

(Problem to be Solved by the Invention) However, according to the conventional structure, a lug with a generally rectangular or oval cross section is adopted, and such a lug is assembled into a correspondingly shaped lug mounting hole provided in a core holder. As a result, the lugs are now prevented from turning. Therefore, there is a problem in that it takes time and effort to process the lugs and the lug mounting holes.

Moreover, since the lugs are connected to the lug drive mechanism inside the core holder using bolts or rivets, there is also the problem that the structure is complicated.

(Means for Solving the Problems) The present invention provides a rotary shaft 1 with a plurality of fixed collars 2 for frictional connection having a cylindrical portion 16 protruding from the inner circumferential portion in one direction in the axial direction. A cylindrical outer circumferential wall 20 of the friction block 3 having approximately the same diameter as the fixing collar is arranged between the adjacent fixing collars 2 and 2, and the inner periphery is in the above-mentioned cylindrical shape at both ends thereof. 16 and the rotating shaft 1 are provided with end wall portions 22 and 21 that are slidably fitted in an airtight manner, and each outer peripheral wall portion 2
A plurality of lug mounting holes 35 having a circular cross section in the radial direction are provided in the air cylinder 0 to connect the internal air chamber 30 to the outside, and a cylindrical lug 6 is slidably fitted therein in an airtight manner to form an air cylinder. The proximal end 37 of the lug 6 on the air chamber side is provided with a large diameter part for preventing removal and a convex part 38 in the center thereof, and a rod-shaped hole is provided in the circumferential direction of the friction block formed in the convex part 38. The return spring 8 is fitted, and its both ends are fitted into the annular groove 40 on the inner surface of the outer peripheral wall, and the distal end surface of the lug 6 is provided with a concavo-convex portion 36 consisting of a plurality of ridges in the axial direction, so that the air chamber 30 is aligned with the rotation axis. This is a lug mounting structure for a tape winding device characterized in that it is connected to an air pressure supply control passage through passages 31 and 32 in the tape winding device.

(Operation) According to the above configuration, by pressurizing the air cylinder mechanism, the lug moves to the core holding position and holds the core. Also, when the air cylinder mechanism is depressurized, the lugs are moved radially inwardly of the friction block by the action of the return springs, allowing the core to be removed from the lugs.

And since the return spring prevents the lug from rotating,
The lugs always maintain a predetermined posture and hold the core accurately and stably.

(Example) FIG. 1 is a partial cross-sectional view of an example, and FIG. 2 is a cross-sectional view of 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 the core 5 in a stable state. The lug 6 is incorporated in each friction block 3 and is adapted to be 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 on the radial side of the 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.

Pressurized air is then 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) According to the present invention, the return spring 8 is fitted into the hole of the convex portion 38 provided at the center of the large-diameter base end 37 of the lug 6 up to its intermediate portion, and both ends thereof are fitted into the groove 40. This alone can combine the action of pulling the lug 6 back into the air chamber 30 and the anti-rotation action of constantly maintaining the convex shape of the uneven portion 36 in the longitudinal direction of the rotating shaft 1, simplifying the structure and reducing the number of parts. In addition, the core 5 can be securely fixed to the friction block 3 in a non-rotatable manner. Since the spring 8 is a simple thin bar, it is easy to manufacture, and since the centrifugal force of the lug 6 acts on the middle part of the spring 8 via the protrusion 38, there is no risk that the spring 8 will move relative to the protrusion 38. Therefore, the action of the return spring can be maintained stably without providing a special fixing mechanism. Since the lug 6 and the bonding hole 35 have a circular cross section, they can be easily manufactured accurately, and a seal between them can be sufficiently secured with an O-ring, making it possible to assemble at a low cost. By simply supplying pressurized air to the air chamber 30, not only can the lug 6 be made to protrude radially outward, but also the end walls 21, 2
The friction block 3 can be driven in the axial direction (to the right in FIG. 1) due to the area difference between the two, and can be connected to the fixed collar 2 by the friction coupling part 10. At this time, the convex shape of the uneven part 36 is Core 5 because it is facing the direction
The lug 6 slides smoothly on the inner surface of the core 5 from the start of pressure contact to the end of pressure contact, which has the advantage of ensuring uniform connection strength at the connection portion 10 at all times.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the embodiment, and FIG. 2 is a cross-sectional view taken from FIG. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 3... Friction block, 5... Core, 6... Lug, 7... Air cylinder mechanism, 8... Return spring, 10... Friction connection part, 20... Friction block outer peripheral wall part, 30
...Air chamber, 35...Lug mounting hole, 40...Groove.

Claims (1)

[Claims] 1 Fixed collar 2 for frictional connection having a cylindrical part 16 protruding from the inner circumferential part to one side in the axial direction on the rotating shaft 1
A plurality of friction blocks 3 are fitted and fixed at intervals while maintaining airtightness, and a cylindrical outer peripheral wall 20 of a friction block 3 having approximately the same diameter as the fixed collar is arranged between adjacent fixed collars 2, 2. End wall parts 22 and 21 are provided at both ends, and the inner peripheries are slidably fitted to the cylindrical part 16 and the rotating shaft 1 in an airtight manner. A plurality of lug mounting holes 35 having a circular cross section in the radial direction are provided, and a cylindrical lug 6 is slidably fitted therein in an airtight manner to form an air cylinder mechanism. The proximal end 37 on the chamber side is provided with a large-diameter part for preventing removal, and a convex part 38 is provided in the center thereof, and a rod-shaped return spring 8 is fitted into a hole in the circumferential direction of the friction block made in the convex part 38. into the annular groove 40 on the inner surface of the outer peripheral wall,
A tape characterized in that an uneven portion 36 consisting of a plurality of protrusions in the axial direction is provided on the tip surface of the lug 6, and the air chamber 30 is connected to the air pressure supply control passage through passages 31 and 32 in the rotating shaft 1. Lug mounting structure for take-up device.