KR950006340Y1 - Hub holder for video tape winding - Google Patents

Abstract

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Description

Video tape winding hub holder

1 is a perspective view showing a state in which a video tape is wound on an outer circumferential surface of a hub inserted into a spinning wheel of a rotating shaft through a holder;

2 is a side view of a conventional hub holder.

3 is a partial cross-sectional view of a conventional hub holder, showing the structure of a rubber pad adhered to an inner circumferential surface of the annular spring to prevent slipping between the annular spring and the outer sleeve.

4 is a half sectional view of a hub holder according to the present invention.

5 is an exploded perspective view of a hub for winding a video tape and a holder according to the present invention.

* Explanation of symbols for main parts of the drawings

30 hub holder 32 inner sleeve

36: bearing 38: outer sleeve

40 clutch assembly 42 elastic rubber ring

44: annular leaf spring 50: hub

The present invention relates to a hub holder interposed between a video tape winding hub and a rotary shaft of the winder and configured to transmit or block a driving force of the rotary shaft to the hub, in particular parallel to each other at predetermined intervals on the outer circumferential surface of the outer sleeve. The present invention relates to a hub holder formed by forming two recesses and inserting a pair of solid member O-rings into the recesses, and then inserting a conventional annular spring around the recess.

In general, a video tape is drawn in a wide width, and then divided into a small number by a plurality of knives arranged at equal intervals, which are handled and distributed in a state of being wound on the outer circumferential surface of the hub. Is called "pancake" in the art.

In manufacturing the pancake, as shown in FIG. 1, the video tape winding hub 12 is fixed to the circumference of the rotary shaft 10 of the winding machine with the holder 14, and then the rotary shaft is rotated in the direction of the arrow. A certain amount of video tape 16 is wound around the hub 12. Once the winding operation is completed, the holder 14 elastically inserted into the inner surface of the hub 12 is removed to complete the pancake consisting of only the hub 12 and the winding tape 16. During the manufacturing process of the pancake, a hub holder 14 having a structure as shown in FIGS. 2 and 3 has been used. The hub holder 14 is inserted into the inner circumferential surface of the hub during the winding of the video tape. Not only does it serve to support it, it also functions as a clutch that transmits or blocks the rotational movement of the rotating shaft to the hub. Looking at the structure of the conventional hub holder 14 schematically, it is provided with an inner sleeve 18 that is first tightly coupled around the rotation axis.

The outer sleeve 20 is coupled to the radially outer side of the inner sleeve 18 via a bearing and pneumatic clutch means (not shown), and an annular leaf spring 22 is formed on the outer circumferential surface of the outer sleeve 20. It is elastically inserted. The annular leaf spring 22 serves to reinforce the coupling force between the hub 12 and the holder 14 when the holder 14 is fitted to the inner surface of the hub 12 for the manufacture of pancakes. In addition, a rubber pad 24 is attached to the inner circumferential surface of the annular leaf spring 22, and the rubber pad has a function of elastically supporting the leaf spring 22 and a leaf spring for the outer sleeve 20 ( 22) to prevent relative movement, that is, slipping.

However, in the conventional hub holder as described above, the centrifugal force is gradually turned on as the winding amount of the video tape is increased during the manufacturing process of the pancake, so that the rubber pad is separated from the inner circumferential surface of the leaf spring.

In this way, when the rubber pad is separated from the leaf spring, the plate spring is pushed in the circumferential direction due to the strong torque generated during the winding of the video tape (slip phenomenon). It melts and sticks to parts (solid state phenomena). Reel holders that cause slippage or solidification can no longer be used. If you continue to use them without replacing them, the winding accuracy of the tape will drop dramatically, resulting in the production of poor quality pancakes.

The present invention is conceived in view of the problems of the prior art as described above, and its object is to provide a hub holder that can produce a high quality pancake by minimizing the slip phenomenon between the outer sleeve and the annular plate spring. It is in

This object can be achieved by removing the conventional uneven rubber plate and forming two circumferential grooves side by side on the surface of the outer sleeve, and then by fitting a pair of rubber rings to the hub holder.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5.

Referring to FIG. 4, the hub holder 30 according to the present invention is shown as a half sectional view. The hub holder 30 has an inner sleeve 32 in contact with a rotating shaft (not shown), and an inclined air flow hole 34 is drilled in the inner sleeve 32. In addition, the outer sleeve 38 is assembled on the outer circumferential surface of the inner sleeve 32 by a pair of radial bearings 36. The outer sleeve 38 has an axial screw hole 38a formed in the body portion. And a flange 38b bulged upward from the upper left end. Apart from the outer sleeve 38, a clutch assembly 40 is attached to the left outer circumferential surface of the inner sleeve 32. The clutch assembly 40 has a piston member (40a) that can engage or disengage from the outer sleeve 38, and the pressure of the compressed air supplied from the outside through the air distribution hole 34 to the piston member The diaphragm 40b for converting into the axial movement of 40a, and the cover member 40c for forming a sealed chamber around this diaphragm are comprised. The clutch assembly 40 of this structure performs a function of mechanically connecting or releasing such a connection between the inner sleeve 32 and the outer sleeve 38. Since the detailed structure and operation of the clutch assembly are known in the art, further description thereof will be omitted.

On the outer circumferential surface of the outer sleeve 38, a pair of grooves 38c are formed parallel to each other along the circumferential direction. In FIG. 4, the groove 38c is shown as having a rectangular cross-sectional shape, although in some cases, other shapes of geometry, such as V-shaped or semi-circular, may be employed. It is preferable to set the depth of the groove 38c so that the rubber ring described later can be accommodated up to approximately ⅓ of its diameter. If the groove 38c is formed too deep, the protruding height of the rubber ring is lowered so that the elastic repulsive force cannot be sufficiently exerted, whereas if it is formed too shallow, the fixed position of the rubber ring becomes unstable and there is a risk of leaving the groove. In the groove 38c having such a size and shape, one elastic rubber ring 42 is inserted in a state where tension is applied thereto. The reason why the rubber ring 42 is put under tension is to prevent the rubber ring 42 from being released from its original position during the assembly or use of the hub holder. After the assembly of the rubber ring 42 is completed, the annular leaf spring 44 is inserted around the rubber ring 42 and the annular frame 46 is attached to the side of the outer sleeve 38. The annular shape 46 can be fixed by screwing the screw 48 into the screw hole 38a of the outer sleeve 38.

5, the hub holder 30 and the video tape winding hub 50 of the present invention are shown in perspective view. The hub 50 has an inner circumferential surface 52 and an outer circumferential surface 54. The hub holder 30 is inserted on the inner circumferential surface 52, and the video tape is wound on the outer circumferential surface 54 as illustrated in FIG. 1. do. In the free state, the outer diameter of the hub holder 30 is generally set slightly larger than the inner diameter of the hub 50. Therefore, when the holder 30 is forcibly inserted on the inner circumferential surface of the hub 50, the annular leaf spring 44 and the rubber ring 42 therein elastically contract toward the radially inner side, so-called snaps. (snap) assembly is possible.

As a result of the winding experiment of the video tape using the hub holder 30 and the conventional hub holder according to the present invention, the experimental values as shown in Table 1 below were obtained. In this table (A) is a general hub and (B) is a side hub.

TABLE 1

As can be seen from the above table, the results of winding experiments performed on the general hub (A) show that the holder of the present invention is much superior to the holder of the prior art, and that the holder of the present invention is used with the uniformity of the side of the pancake. It is advantageous. However, in the case of the side hub (B), the difference between the present invention and the prior art in terms of defective winding ratio is small, but this was found to be the cause of the uneven quality of the side hub itself.

As described in detail above, according to the hub holder of the present invention, instead of the conventional rubber pad, a pair of elastic rubber rings are sandwiched between the annular plate spring and the outer sleeve so that a strong torque during the winding process of the video tape is achieved. Even if it acts, the elastic rubber ring is not pushed in the circumferential direction, and it does not cause solidification due to overheating during long-term use. Accordingly, the present invention provides an industrially useful effect of minimizing bad winding of a video tape to improve pancake quality and to extend the useful life of the hub holder.

Claims (1)

The inner sleeve 32, the outer sleeve 38 assembled through the bearing 36 on the outer circumferential surface of the inner sleeve, and the inner and outer sleeves 32 and 38 are mechanically connected or connected. In the hub holder 30 which consists of the clutch means 40 which release | releases, and the annular leaf spring 44 arrange | positioned at the radially outer side of the said outer sleeve 38, the outer peripheral surface of the said outer sleeve 38 is circumferentially. A pair of grooves (38c) are formed parallel to each other, and the elastic rubber ring (42) is inserted into the grooves (38c) and installed.