KR100318005B1 - Manufacturing method of VRF pinch lever - Google Patents

Abstract

The present invention relates to a pinch lever manufacturing method of a video cassette recorder player (VCR). In particular, it is possible to reduce the cost by mass production by using a low-cost alternative material, and functionally change the position of the pinch roller shaft and the pinch shaft. It is to provide a pinch lever with high accuracy by improving the poor vertical accuracy.

In the manufacturing method of the present invention, in order to mold the pinch lever of the specified specification, the protrusion of the pinch roller shaft hole is formed in a dedicated progressive mold by a drawing process to form a pinch roller shaft hole, and the entire shape of the pinch lever is pressed in this mold. Step 2 to separate the pinch shaft hole into two stages in the process, forming a pinch shaft hole by the bending method, and riveting the pinch roller shaft to the pinch roller shaft hole after the steps 1 and 2 It consists of the process of caulking using a machine.

Description

Manufacturing method of V-SR pinch lever

The present invention relates to a pinch lever manufacturing method of a video cassette recorder player (VCR). In particular, it is possible to reduce the cost by mass production by using a low-cost alternative material, and functionally change the position of the pinch roller shaft and the pinch shaft. It is to improve the poor vertical degree.

The main function of the pinch lever used in the video cassette recorder player is that the reel table speed is the same from start to finish in the play mode, depending on how much the cassette tape is wound on the hub by the beginning / medium / end. The speed of passing through the recording and playback head is relatively fast, so that the noise and blurring of the screen may occur in the play mode, and the voice may be stretched or accelerated, and the pinch roller may be moved to close or drop the cassette tape to the capstan shaft. To play a role.

That is, as shown in FIG. 1, the pinch roller shaft 2 and the capstan shaft 3 are mounted on the pinch lever 1 side so that the cassette tape 4 travels between the pinch roller 5 and the capstan shaft 3. And the pinch roller 5 is designed to apply a constant pressure in the direction of the capstan shaft (3) during driving, it corresponds to a kind of part to guide the tape (4) during constant travel.

The main part of the pinch lever drive unit has a pinch lever 1 and a cam gear 7 having a predetermined trajectory 6 and a pinch arm 8 that interlocks along the trajectory 6 by the rotation of the cam gear 7. And a pinch roller 5 mounted at the small end of the pinch lever 1, the operation of which is performed when the trajectory 6 is moved by the rotation of the cam gear 7. Received through the pinch shaft (9) while rotating around the pinch roller (5) to determine whether to provide pressure to the cassette tape (4).

A general manufacturing method of the pinch lever uses a method of die casting zinc (ZN) as a base material.

2 shows the initial shape of the pinch lever 1 produced by the above method.

In this initial manufacturing process, the pinch lever (1) small end side pinch roller shaft hole (10) has a protruding guide boss (11), the center diameter of which is formed to be approximately 2 mm in and out, and thereafter, for a separate hole processing The machine uses a new pinch roller shaft hole (10a) with a modified tolerance of + 0 / -0.01 tolerance of 3.00 mm.

When the processing of the pinch roller shaft hole (10a) is completed, the pinch roller shaft (2), which is the main shaft for fixing the pinch roller (5) through the process of forcibly press-fitting in the 'A' direction as shown in FIG. The pinch lever 1 assembled unit as shown in FIG. 4 is manufactured.

At this time, when the pinch roller 5 is inserted into the pinch roller shaft 2, the inner wall of the pinch roller 5 contacts the outer wall of the guide boss 11 side of the pinch roller shaft hole 10a so that the pinch roller 5 is fixed. The fixing power is secured.

In addition, in the pinch lever 1, a pinch shaft hole 13 for fixing the pinch lever 1 to the main base, in addition to the pinch roller shaft hole 10a, is formed integrally in a form in which the guide boss 12 protrudes. It is intended to guide the assembly of the shaft 9.

However, the conventional pinch lever manufacturing method causes excessive material costs due to the limitation of supply demand due to the use of imported raw materials and fluctuations in material costs according to the volume of raw materials, and causes environmental pollution and occupational diseases during die casting and hole cutting processes. And even in working conditions.

In addition, due to the bubble phenomenon of parts which are not confirmed in appearance during die casting casting during the machining process, the track 6 of the cam gear 7 and the end of the pinch arm 8 on the pinch lever 1 during the operation of the video cassette recorder player. The operation stability is lowered due to the fallout of the cam post 14 due to the moving pressure of the cam post 14 mounted on the cam post 14, and all these factors have a problem of increasing the manufacturing cost and increasing the probability of occurrence of operation error of the device.

As another method of manufacturing the pinch lever, a method of press forming the pinch lever is known. This method partially improved the cost increase and motion stability seen in die casting casting, but it was difficult to accurately match the verticality and concentricity of pinch shaft or pinch roller shaft, especially pinch lever supporting the pinch lever on the base according to the repeated operation of pinch lever. Axial deformation of the shaft is occurring, and pinch shaft assembly step is difficult to accurately assemble the pinch shaft hole.

Accordingly, an object of the present invention is to provide a new manufacturing method that reduces the production cost by reducing the loss in the production process of the pinch lever.

Another object of the present invention is to obtain the advantage of the material properties through a manufacturing method using a substitute material to eliminate the operation defect of the pinch lever.

In order to achieve the above object, the BNC pinch lever manufacturing method of the present invention forms a pinch roller shaft hole by forming a protrusion of a pinch roller shaft hole in a dedicated mold by a drawing process in order to mold a pinch lever of a prescribed specification, In the pinch lever manufacturing method of V-Cal which forms a pinch shaft hole at one end of the pinch lever and press-processes the entire shape of the pinch lever in the mold,

Forming a pinch shaft hole in the corresponding part by forming a pinch shaft fixing part by bending the pinch shaft fixing part in which the respective grooves are given to the connection part by dividing one end of the pinch lever into which the pinch shaft is fitted in the press working process; ,

Processing the pinch roller shaft and the pinch shaft hole to match the diameter of the shaft, and joining the pinch roller shaft and the pinch shaft;

Caulking the pinch roller shaft fitted into the pinch roller shaft hole using a riveting machine, and the pinch roller shaft is fixed by maintaining the verticality through the caulking processing.

1 is a plan view of the interlocking portion of the V-AL pinch lever

Figure 2 shows the V-Cal Lever lever separately completed by the conventional method

(A) A plan view (b) A front view (c) A side view

3 is a view for explaining a pressing process of the pinch roller shaft in FIG.

Figure 4 shows the assembly of the pinch lever produced by the conventional method

(A) A plan view (b) A front view (c) A side view

Figure 5 as showing a single piece of the pinch lever produced by the present invention

(A) A plan view (b) A front view (c) A side view

Figure 6 as showing the manufacturing process of the pinch lever according to the present invention

(A) a plan view (b) a front view

Figure 7 shows the pinch lever completeness of the present invention

(A) A plan view (b) A front view (c) A side view

*** Explanation of symbols for main parts of drawing ***

1: Pinch lever 2,2a: Pinch roller shaft

3: capstan shaft 4: cassette tape

5: Pinch roller 6: Trajectory

7: Cam Gear 8: Pinch Arm

9: pinch shaft 14: CAM POST (CAM POST)

20: Pinch roller shaft hole 21, 21a: Pinch shaft shaft

22: step

Applying the method of manufacturing the pinch lever of the present invention can produce a single piece of the pinch lever as shown in FIG.

The pinch lever 1 of the specification defined in the present invention is a shape shown in FIG. That is, it has a shape having a pinch shaft fixing portion into which the pinch shaft 9 is fitted, and a bidirectional protrusion for extending the pinch shaft fixing portion to fix the pinch rollers 5 and the cam posts 14 on the ends, respectively. The specified specification is assumed.

In order to mold the pinch lever of the prescribed specification as described above, the present invention forms the protrusion of the pinch roller shaft hole 20 in a dedicated mold by a drawing process to form the pinch roller shaft hole 20, and pinch at one end of the pinch lever. Shaft holes 21 and 21a are formed to press the entire shape of the pinch lever in the mold.

In the press working process, one end of the pinch lever into which the pinch shaft 9 is fitted is divided into two stages, and a pinch shaft fixing part in which each groove is given to the connection part is formed by bending, and then two pinch shafts are formed on the corresponding part. The pinch roller shaft 2a and the pinch shaft 9 are formed so that the holes 21 and 21a are formed, and the pinch roller shaft hole 20 and the pinch shaft hole 21 and 21a match the diameters of the pinch shaft 9. ), The pinch roller shaft 2a fitted into the pinch roller shaft hole 20 is caulked using a riveting machine, and the pinch roller shaft 2a is maintained by maintaining the verticality through the caulking process. Apply the method of fixing.

As the material of the pinch lever 1, an electro galvanized steel sheet is used.

In addition, in order to increase the fixing force of the pinch roller 5 to the pinch roller shaft 2a, the pinch roller fixing step 22 is directly machined to the pinch roller shaft 2a.

According to the present invention, it is known that the thickness of the base material and the diameter and length of the protrusion in the press work in the prescribed pinch lever manufacturing cannot be processed due to the large difference between the processing conditions.

However, a press of 3 mm part for fixing the pinch roller shaft 2a to the pinch lever 1, that is, a part for forming the pinch roller shaft hole 20, is formed in the progressive mold by using a drawing processing method. The pinch lever can be manufactured by the process.

In addition, in the case of the pinch lever manufactured by the conventional manufacturing method, the pinch shaft hole for fixing the pinch lever through the pinch shaft 9 is formed integrally on the main base, but in the present invention, the pinch shaft hole 21 (21a) ) Is divided into two stages and bent to form a bending process to fit the pinch shaft (9), it is possible to uniformly maintain a high precision concentricity.

That is, in the related art, since the pinch shaft 9 is press-fitted into the pinch shaft holes 21 and 21a when the pinch shaft 9 is fitted, the concentricity of the pinch shaft 9 may not be kept constant during the operation. .

In addition, if the pinch shaft hole does not fit the outer diameter of the pinch shaft and the tolerance tolerance correctly during the indentation process, the coupling is impossible and the excessive input pressure appears as a defect of the fixing part. By machining the corresponding grooves, the pinch shaft 9 can be press-fitted into a predetermined deformation or elastic deformation, thereby widening the allowable tolerance area and fixing the pinch shafts from above and below, respectively, thereby improving the supporting force and maintaining the verticality.

Also, in the conventional manufacturing method, the pinching roller shaft hole is actually processed to fix the pinch roller shaft, and then the pinching roller shaft is forced into the pinch roller shaft hole in the present invention. By switching to work and fixing the pinch roller shaft 2a to the pinch roller shaft hole 20, problems such as deformation of the pinch roller shaft 2a and poor verticality of the pinch roller shaft 2a during the reprocessing and forced press-in of the hole This is solved.

On the other hand, the present invention can reduce the cost required for the raw materials, compared to the conventional pinch lever manufacturing method of forming a die cast casting method using zinc by using an electro-zinc steel sheet as a pinch lever material, the domestic replacement effect of raw materials and work Overall productivity can be improved by simplifying the process.

In addition, in order to increase the fixing force of the pinch roller 5 to the pinch roller shaft 2a, the pinch roller fixing stepped jaw 22 is processed directly on the pinch roller shaft 2a, so that the conventional integrated pinch roller fixing guide is also possible. While maintaining the fixing force of the pinch roller of the boss is equal, it is compatible without changing the design of the pinch roller (5).

Table 1) Processing Process and Processing Cost Comparison Table

The comparison table shows a simple comparison of raw materials and processes for the production of pinch levers. The present invention has resulted in significant material cost savings by the replacement of raw materials, and the cost reduction in the manufacturing process by changing die casting casting to press molding in the process. In addition, productivity was simplified through process simplification.

As such, the present invention can reduce production costs and improve productivity through the use of alternative materials for the pinch lever and the simplification of the processing process, and improve the pinch roller rotational stability by maintaining a constant concentricity in the pinch roller shaft assembly step. In addition, the pinch lever, which is the rotation center of the pinch lever, is secured on the main base, thereby improving the malfunction of the pinch lever.

Claims (1)

In order to mold the pinch lever of the specified specification, the protrusion of the pinch roller shaft hole is formed in a dedicated mold by a drawing process to form a pinch roller shaft hole, and a pinch shaft hole is formed at one end of the pinch lever. In the pinch lever manufacturing method of V-Cal which press-processes the whole shape, Forming a pinch shaft hole in the corresponding part by forming a pinch shaft fixing part by bending the pinch shaft fixing part in which the respective grooves are given to the connection part by dividing one end of the pinch lever into which the pinch shaft is fitted in the press working process; , Processing the pinch roller shaft and the pinch shaft hole to match the diameter of the shaft, and joining the pinch roller shaft and the pinch shaft; The pinch roller shaft inserted into the pinch roller shaft hole is caulked using a riveting machine, and the pinch roller shaft is manufactured by fixing the pinch roller shaft by maintaining verticality through the caulking process. Way.