KR930008295Y1 - Tap guide roller apparatus for vtr - Google Patents

Abstract

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Description

VRT's Tape Guide Roller Device

1 is a conventional tape guide roller device.

2 is a conventional guide roller rotation state.

3 is a diagram illustrating a tape guide roller device of the present invention.

4 is a partially enlarged view of FIG.

5 is a view comparing the operating state of the guide roller according to the present invention and the conventional apparatus.

* Explanation of symbols for main parts of the drawings

1 shaft 2 guide roller

2a: shaft hole 2b: stepped portion

3: Upper guide 3a: Boss of the upper guide

4: Lower guide 4a: Boss of lower guide

5: screw 6: tape

The present invention relates to the structure of a VCA tape guide roller device, and in particular, the rolling contact portion with respect to the fixed shaft of the guide roller that rotates by the running friction of the tape when the tape travels with a constant winding angle to the guide roller The present invention relates to a guide roller device which minimizes and improves the degree of rotation.

A conventional guide roller device is shown in FIG.

As shown in FIG. 1, the guide roller device is forcibly fitted with the screw 5 and the lower guide 4 on the fixed shaft 1, and the guide roller 2 has a constant clearance between the shaft 1 The upper guide 3 is forcibly fitted to the shaft at the end of the shaft 1.

The guide roller device is fixed to the screw hole formed in the deck device of the V-al through the screw (5), and serves to guide the magnetic tape while driving.

The guide roller 2 is prevented from being separated from the shaft 1 by the upper guide 3 and the lower guide 4 on the upper side, and at the same time, the shaft can be rotated about the shaft 1 as the central axis. The upper guide and the lower guide have a certain clearance and are designed to allow a certain amount of play.

In addition, the upper guide 3 serves to regulate the height of the tape by pressing the upper end of the tape (6) wound around the guide roller running.

The operation of the conventional guide roller device is operated as in the second degree (e).

That is, the tape 6 in the deck device of V-Cal is wound around the guide roller 2 at a predetermined angle in a state where the upper end is restricted by the upper guide 3.

At this time, when the tape 6 travels at a constant speed V, the guide roller 2 in contact with the tape 6 rotates at a constant angular speed ω with the shaft 1 as the rotation axis by the driving friction force of the tape 6. Will be.

For reference, the function of the guide roller is to allow the tape 6 to be stably conveyed along a predetermined driving path without vibrating or shaking on the deck device of VAL.

However, the inner diameter of the guide roller (2) is to include a machining error to some extent to have a manufacturing distribution such as cylindrical or straightness.

Therefore, as shown in (a) and (b) of FIG. 2, when the inner diameter of the guide roller (2) is cylindrical or the turnover is rather large, when the tape travels as shown in (c) and (d) of FIG. Rolling or Tklting occurs in the guide roller, which is transmitted to the tape as it is, and thus the tape may not be conveyed normally or causes a tape vibration.

In addition, conventionally, as disclosed in Japanese Patent Laid-Open No. 63-66751, it is suggested that the guide roller is rotated smoothly by injecting lubricating oil between the shaft and the guide roller. Not only could not be obtained, there is a possibility that the injected lubricant is leaked to the outside by the centrifugal force due to long time use has a serious adverse effect on the tape.

In addition, conventionally, as shown in Japanese Patent Laid-Open No. 61-118130, a bearing is inserted between the shaft and the guide roller to smooth the rotation of the guide roller. However, since a separate bearing is inserted, the assembly, There was a problem that productivity is greatly reduced and costs are increased.

The present invention was devised to compensate for the disadvantage that the tape is not transported to the normal state or vibrated by vibrating due to the cylinder degree, which inevitably has a processing bias in the manufacture of the guide roller. It will be described in detail as follows.

3 is a diagram illustrating a tape guide roller device of the present invention, and FIG. 4 is a partially enlarged view of FIG. 3, and as shown therein, the guide roller device includes a screw 5 fitted to a fixed shaft 1, The lower guide 4 having the boss 4a is fitted coaxially, and the guide roller 2 having the upper and lower ends 2a, 2b tucked up and down in the inner diameter is formed coaxially, and the boss 3a An upper guide 3 having a fitting is fitted to the shaft 1.

In addition, as shown in the fourth diagram, the inner circumferential surface and upper portion of the stepped portions 2b and 2b formed on the inner diameter of the shaft hole 2a of the guide roller 2 and the clearance ε ₁ of the shaft ₁ on the upper and lower inner circumferential surfaces of the guide roller 2, respectively. The gap 3 between the boss 3a of the guide 3 and the outer circumferential surface of the boss 4a of the lower guide 4 is greater than ₂ .

This allows the guide roller 2 to come into contact with the upper guide 3 and the lower guide 4 even when the guide roller 2 rotates the shaft 1 in the axial center, without directly contacting the shaft 1. .

Referring to the operation relationship of the present invention, when the guide roller 2 of the present invention is rotated by a tape, as shown in Figure 4 the guide roller 2 is fixed to the inner peripheral surface of the shaft hole (2a) The inner circumferential surface of the upper and lower stepped portions 2b and 2b does not directly contact the outer circumferential surface of the shaft 1 but rotates while contacting the outer circumferential surfaces of the bosses 3a and 4a formed on the upper guide 3 and the lower guide 4. Done.

Referring to FIG. 5, (a) is an operation of a conventional guide roller device, in which the traveling tape 6 contacts the guide roller 2 while applying a force of F to the guide roller 2 in the axial direction. When the guide roller 2 is rotated by the friction force by this axial force.

At this time, since the inner diameter of the shaft hole 2a of the guide roller 2 is in direct contact with the outer circumferential surface of the fixed shaft 1 (the X part is the contact portion), the inner diameter of the shaft hole 2a of the guide roller 2 has a high accuracy. It will greatly affect the rotation.

Figure (b) of Figure 5 is the operation of the guide roller according to the present invention, when the running tape 6 exerts a force F in the axial direction, the guide roller (3) by the friction force of the running tape 6 and the guide roller (2) 2) is rotated, and even when the guide roller 2 is rotated, the inner circumferential surface of the shaft hole 2a does not directly contact the outer circumferential surface of the shaft 1, and the inner circumferential surfaces of the upper and lower stepped portions 2b and 2b are upper part. The outer circumferential surfaces of the bosses 3a and 4a of the guide 3 and the lower guide 4 come into contact with each other to reduce the area of the contact portion as compared with the conventional one, and at the same time rotate the inner diameter state of the shaft hole 2a of the guide roller 2. The impact on the air is reduced compared to the conventional.

That is, as described in FIG. 2, the guide roller 2 may be unbalanced due to variations in cylindricalness, roundness, and trueness due to the machining deviation of the inner diameter of the shaft hole 2a of the guide roller 2. In this invention, the effect of worsening the rotational hardness can be improved.

In other words, the present invention improves the degree of rotation of the guide roller 2 which is rotated by the running friction of the tape 6 with the fixed shaft 1 as the rotation axis, thereby improving the processing state of the guide roller 2. In order to minimize the influence of machining deviations such as cylindricalness, roundness, and straightness, the entire inner diameter of the shaft hole 2a of the guide roller 2 is rotated while being in direct contact with the fixed shaft 1 to guide Rotation of the guide roller 2 by bringing only the outer circumferential surfaces of the stepped portions 2b and 2b formed on the upper and lower ends of the roller 2 into contact with the bosses 3a and 4a of the upper guide 3 and the lower guide 4. By preventing the shaking and tilting of the tape 6 which may be caused, the tape 6 has an effect of allowing the tape 6 to travel along a normal and stable driving path in the deck device.

Claims (1)

In the fixed shaft 1, which is inserted into the shaft hole 2a of the guide roller 2 and supported to rotate, the distance between the inner diameters of the upper and lower ends of the guide roller 2 and the protrusions of the upper and lower guide portions positioned on the fixed shaft is Vr tape guide roller device, characterized in that the rotation of the guide roller upper and lower ends between the guide roller inner diameter and the fixed shaft greater than the upper and lower ends of the guide roller in contact with the protrusion of the guide portion.