KR20040061387A - A pinchroller assembly for tape driving - Google Patents

Abstract

PURPOSE: A pinch roller assembly for transferring a tape is provided to simultaneously perform a function for preventing a pinch roller from being stripped by using a stopper cap, and a function for functioning as a bearing for supporting a rotation of the pinch roller, thereby minimizing the number of components in the pinch roller assembly. CONSTITUTION: A pinch roller arm(30) is rotatively installed on one side of a main chassis. A roller shaft(40) is disposed on one side of the pinch roller arm(30), and has the first stepped pulley(41) and the second stepped pulley(42) at certain height intervals. A pinch roller(50) is inserted into the roller shaft(40) with a predetermined step difference on an inside diameter surface, is set on the second stepped pulley(42), and rotates at the roller shaft(40). A stopper cap(60) is injected on an outer side of the roller shaft(40), has an outside diameter in which a stepped pulley(53) of the pinch roller(50) is hooked over, and where an outer side thereof relatively rotates on the inside diameter surface of the pinch roller(50).

Description

A pinchroller assembly for tape driving

The present invention relates to a pinch roller assembly, and more particularly, to a pinch roller assembly for conveying a tape in cooperation with a capstan shaft in a magnetic recorder.

Figure 1 is a partial cross-sectional view showing the relationship between the pinch roller assembly and the cap stub shaft for conveying tape in a conventional magnetic recording player, Figure 2 is an exploded cross-sectional view showing the configuration of the pinch roller assembly according to the prior art 3 is an exploded cross-sectional view of the pinch roller constituting the pinch roller assembly according to the prior art.

As shown in these figures, the capstan motor 3 is provided in the main chassis 1 of the magnetic recording and reproducing apparatus. The capstan motor 3 provides a driving force for conveying the tape T, and rotates the supply hub and the winding hub of the tape cassette to drive the tape T in the forward and reverse directions. To this end, the capstan motor 3 is provided with a drive pulley 5, and the drive pulley 5 is wound with a belt 6 to transmit power.

On the other hand, the capstan shaft 7 which is the output shaft of the capstan motor 3 protrudes to the opposite side of the main chassis 1 in which the capstan motor 3 is installed to pull the tape T in the conveying direction in the tape running system. Play a role. At this time, the pinch roller assembly 10 is used to bring the tape T into close contact with the capstan shaft 7.

The pinch roller assembly 10 is installed on the main chassis 1 so that the pinch roller 13 is in close contact with the capstan shaft 7 to adhere the tape T to the capstan shaft 7. .

The pinch roller assembly 10 has a pinch roller arm 11 which is rotatably installed in the main chassis 1 at a predetermined angle. A roller shaft 12 is provided at one end of the pinch roller arm 11. The roller shaft 12 has a stepped portion 12 'surrounding one side of its outer circumferential surface.

A pinch roller 13 is provided to freely rotate the roller shaft 12 at the center of rotation. The pinch roller 13 has a cylindrical metallic sleeve 14 in the center thereof, and a roller body 15 surrounding the outer surface of the sleeve 14. The roller body 15 is made of synthetic rubber or the like. A stepped portion 14 'is also provided on the inner surface of the sleeve 14.

The bearing 16 is installed inside the sleeve 14. The outer diameter of the bearing 16 is pressed into the sleeve 14, and the inner diameter thereof forms a sliding surface with the outer surface of the roller shaft 12. The bearing 16 is made of a resin having good wear resistance and lubricity. In order to prevent the bearing 16 from being removed from the pinch roller 13, the lower stopper 17 is press-fitted into the sleeve 14.

On the other hand, in order to prevent the pinch roller 13 from being removed from the roller shaft 12, the stopper cap 18 is press-fitted on the upper portion of the roller shaft 12, that is, the upper portion of the stepped portion 12 '. . The stopper cap 18 allows the upper end of the bearing 16 to hang so that the pinch roller 13 is not removed. Reference numeral 19 is a washer.

In the prior art having such a configuration, the bearing 16 is pressed into the sleeve 14 of the pinch roller 13, the lower stopper 17 is sleeved to prevent the removal of the bearing 16 It is pressed in at (14).

The pinch roller 13 into which the bearing 16 is inserted is inserted into the roller shaft 12. In addition, the stopper cap 18 is inserted into an upper end of the roller shaft 12 to prevent the pinch roller 13 from being removed from the roller shaft 12.

The pinch roller 13 rotates while the inner diameter surface of the bearing 16 slides with the outer diameter surface of the lower portion of the stepped portion 12 'of the roller shaft 12. Therefore, the inner diameter surface of the bearing 16 and the corresponding outer diameter surface of the roller shaft 12 are required to have a high degree of processing for improving wear resistance. In addition, in the case of the bearing 16, the outer diameter surface is required to be processed to a high degree in order to improve concentricity and wear resistance with the pinch roller 13 itself.

On the other hand, the dimensions related to the self-alignment of the pinch roller 13 between the roller shaft 12 and the bearing 16 is performed as shown in the height (a) of the bearing 16 and shown in Figure 4a In the same state is the distance b between one outer surface of the roller shaft 12 and the corresponding inner surface of the bearing 16.

However, the prior art as described above has the following problems.

First, in the conventional pinch roller assembly 10, the inner diameter surface and the outer diameter surface of the bearing 16 must be simultaneously processed to a high degree in order to improve durability, and the outer diameter surface of the roller shaft 12 also needs to be processed to a high degree. Therefore, there is a problem in that the processing of parts for manufacturing the pinch roller assembly 10 is very difficult.

In the prior art, the lower stopper 17 is used to prevent the removal of the bearing 16, and the stopper cap 18 is used to prevent the pinch roller 13 from being removed from the roller shaft 12. . Therefore, a problem arises in that the number of parts constituting the pinch roller assembly 10 increases as a whole.

Lastly, in the prior art, the bearing 16 is press-fitted into the sleeve 14 of the pinch roller 13. However, in such a structure, since the friction area between them is relatively large, when the bearing 16 is inserted into the inside of the sleeve 14, as shown in FIG. do. In this case, a problem arises in that rotation run-out of the pinch roller 13 becomes worse.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a pinch roller assembly in which the number of parts is minimized.

Another object of the present invention is to provide a pinch roller assembly in which the processing point of a part is minimized.

It is another object of the present invention to provide a pinch roller assembly with a minimum assembly tolerance.

1 is a partial cross-sectional view showing a relationship between a pinch roller assembly and a cap stub shaft for feeding a tape in a general magnetic recording player.

Figure 2 is an exploded cross-sectional view showing the configuration of the pinch roller assembly according to the prior art.

Figure 3 is an exploded cross-sectional view of the pinch roller constituting the pinch roller assembly according to the prior art.

Figure 4a is an explanatory view showing the dimensions of the self-aligning in the pinch roller assembly according to the prior art.

4B is an explanatory view showing a state in which a bearing is incorrectly pressed into a pinch roller according to the prior art;

Figure 5 is a partial cross-sectional exploded view showing the configuration of a preferred embodiment of the pinch roller assembly for tape transfer according to the present invention.

Figure 6 is a partial cross-sectional view showing the configuration of an embodiment of the present invention.

Figure 7 is an explanatory view showing the dimensions related to the self-aligning in the present invention.

Explanation of symbols on the main parts of the drawings

30: pinch roller arm 40: roller shaft

41: first step 42: second step

50: pinch roller 52: sleeve

54: roller body 60: stopper cap

According to a feature of the present invention for achieving the object as described above, the present invention is a pinch roller arm which is rotatably installed at an angle about one side on the main chassis side, and provided on one side of the pinch roller arm and a predetermined height The roller shaft has a first step and a second step with a difference, and an outer surface is made of a material having elasticity, and an inner diameter surface is inserted into the roller shaft with a predetermined step, and is seated on the second step so as to center the roller shaft. It consists of a pinch roller rotatably installed, and a stopper cap press-fitted to the outer surface of the roller shaft and the outer diameter of the stepped step of the pinch roller is rotated relative to the inner diameter surface of the pinch roller.

As the roller shaft goes from the lower end to the upper end, the outer diameter of the second step and the first step becomes smaller step by step, and the inner circumferential surface of the pinch roller has an inner diameter based on the step as opposed to the roller axis.

The stopper cap is made of a lubricating resin, and the outer circumferential surface thereof is precisely processed, and the inner circumferential surface of the pinch roller corresponding to the outer circumferential surface of the stopper cap is precisely processed.

Tape feed pinch roller assembly according to the present invention having such a configuration has the advantage that the component is minimized, the processing of the component is easy and the assembly tolerance is minimized.

Hereinafter, a preferred embodiment of the pinch roller assembly for tape transfer according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 5 shows a partial cross-sectional exploded view of a configuration of a preferred embodiment of a tape feed pinch roller assembly according to the present invention, and Fig. 4 shows a partial cross-sectional view of a constitution of an embodiment of the present invention.

As shown in these figures, the pinch roller arm 30 is provided on the main chassis. The pinch roller arm 30 is installed on the main chassis so that a portion of the roller shaft 40, which will be described below, is rotated about an axis of rotation.

At one end of the pinch roller arm 30, the roller shaft 40 is installed upright. The roller shaft 40 is formed such that its outer diameter increases from the upper side to the lower side, and the outer diameter changes based on the first step 41 and the second step 42. In addition, the second step 42 may be formed on the pinch roller arm 30 without being formed on the roller shaft 40 itself.

The pinch roller 50 is rotatably installed on the roller shaft 40. The pinch roller 50 is formed by the roller body 54 on the outer surface of the sleeve 52 of the metal material, the roller body 54 is most preferably a synthetic rubber material. The inner circumferential surface of the sleeve 52 has an inner diameter that is larger than the outer diameter between the first step 41 and the second step 42 of the roller shaft 40, and the upper part of the sleeve 52 is centered on the step 53. The inner diameter is relatively large and the lower portion is formed with a relatively small inner diameter.

A lower end of the pinch roller 50 is seated on the second step 42, and a washer 55 is disposed between the second step 42 and the bottom surface of the pinch roller 50 to minimize friction therebetween. Is installed. Here, the distance between the first step 41 and the second step 42 of the roller shaft 40 is formed by h longer than the distance from the step 53 to the lower end of the pinch roller 50, h is pinch It becomes a trust gap of the up-down direction of the roller 50.

On the other hand, the stopper cap 60 is pressed into the upper end of the roller shaft (40). The stopper cap 60 has its outer circumferential surface relatively rotated with the inner circumferential surface of the pinch roller 50. That is, the outer circumferential surface of the stopper cap 60 and the inner circumferential surface of the sleeve 52 of the pinch roller 50 corresponding thereto become sliding surfaces. The stopper cap 60 is preferably made of a lubricating resin.

The outer diameter of the stopper cap 60 is smaller than the inner diameter of the upper portion and larger than the inner diameter of the lower portion based on the step 53 of the pinch roller 50. As a result, the step 53 is hooked to the lower end of the stopper cap 60 to prevent the pinch roller 50 from being removed.

Hereinafter, the action of the tape feed pinch roller assembly according to the present invention having the configuration as described above will be described in detail.

The pinch roller 50 is rotatably inserted into the roller shaft 40, and is seated on the second step 42 with the washer 55 interposed therebetween. Then, in order to prevent the pinch roller 50 from being removed, the stopper cap 60 is press-fitted into the roller shaft 40.

At this time, the stopper cap 60 is preferably seated on the first step 41 of the roller shaft 40, but is not necessarily so. However, in order for the pinch roller 50 to have a trust gap with respect to the roller shaft 40, the distance between the first step 41 and the second step 42 of the roller shaft 40 and the pinch roller When the distance from the step 53 to the lower end of the step 50 differs by the trust gap h, it is preferable that the stopper cap 60 is seated on the first step 41 in the assembling process.

In the pinch roller assembly as described above, the pinch roller 50 rotates about the roller shaft 40, and the sliding surfaces of the pinch roller 50 constitute the outer peripheral surface of the stopper cap 60 and the sleeve forming the pinch roller 50. It is a part corresponding to the upper part of the step | step 53 among the inner diameter surfaces of 52.

In the present invention having the above-described configuration, the precision processing among the components constituting the pinch roller assembly is an outer circumferential surface of the stopper cap 60 and an inner circumferential surface corresponding to an upper portion of the step 53 of the sleeve 52. .

In addition, the stopper cap 60 is press-fitted to the outer circumferential surface of the roller shaft 40, and the friction area is relatively reduced since the inner circumferential surface of the stopper cap 60 is pressed against the outer circumferential surface of the roller shaft 40. This can be done more easily.

On the other hand, in the present invention, the relevant dimensions for the self-alignment of the pinch roller 50 is shown in FIG. That is, the distance b between the height a of the stopper cap 60 and one side of the outer circumferential surface of the stopper cap 60 and one side of the inner circumferential surface of the step 53 above the sleeve 52 is the same.

In the pinch roller assembly as described above, the pinch roller 50 is in close contact with the tape T on the outer surface of the capstan shaft and serves to draw the tape T while being rotated together by the rotation of the capstan shaft.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

Tape feed pinch roller assembly according to the present invention as described in detail above was configured to perform the role of the stopper cap to prevent the pinch roller is removed and the role of the bearing to support the pinch roller rotatable. Therefore, the effect of minimizing the number of parts constituting the pinch roller assembly can be obtained.

In addition, the stopper cap is pressed into the roller shaft and the outer surface of the stopper cap forms a surface that slides with the inner circumferential surface of the pinch roller.

Finally, since the inner surface of the stopper cap is press-fitted to the outer surface of the roller shaft and fixed, the friction area between them can be relatively reduced, thereby increasing the accuracy of the assembly work.

Claims (3)

A pinch roller arm which is rotatably installed at a predetermined angle about one side of the main chassis side; A roller shaft provided at one side of the pinch roller arm and having a first height difference and a first step and a second step; A pinch roller having an outer surface made of an elastic material and having an inner diameter surface inserted into the roller shaft with a predetermined step and seated on the second step so as to be rotatable about a roller shaft; And a stopper cap press-fitted to an outer surface of the roller shaft and having an outer diameter on which a step of the pinch roller is walked, and an outer surface of which is rotated relative to the inner diameter surface of the pinch roller. According to claim 1, wherein the roller shaft from the lower end to the upper end, the outer diameter of the second step and the first step becomes smaller step by step, the inner circumferential surface of the pinch roller is formed on the basis of the step, as opposed to the roller axis Pinch roller assembly for tape isol, characterized in that. The pinch roller assembly according to claim 1, wherein the stopper cap is made of a lubricating resin, and the outer circumferential surface thereof is precisely processed, and the inner circumferential surface of the pinch roller corresponding to the outer circumferential surface of the stopper cap is precisely machined.