JPS5964771A - Preparation of capstan - Google Patents

Abstract

PURPOSE:To easily and inexpensively prepare a capstan having long life and excellent tape driving capacity, by a method wherein nitriding treatment is applied to the surface of a capstan substrate comprising stainless steel and barrel grinding treatment is applied to the entire surface of the treated substrate. CONSTITUTION:Nitriding treatment is applied to the entire surface of a capstan substrate comprising stainless steel subjected to centerless grinding to form a high hardness surface having minute recessed and protruded parts with surface hardness Hkc of about 70 or more and surface roughness of about 0.5-1.0S. In the next step, the capstan substrate after nitriding treatment is put in a cylinder along with grinding material to perform barrel grinding to remove the oxide film on the surface thereof and a capstant 5 having a rough surface of which the heights of the protruded parts of the minute recessed and protruded parts are made almost constant is obtained. A capstan drive part obtained by using this capstan 5 generates sufficient tape driving force when a pinch roller is contacted with a tape under pressure and abrasion of a bearing part 4 is reduced while good rotary preciseness can be maintained over a longtime.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a large tape drive force and! ! The present invention relates to a method for manufacturing a capstan for a tape recorder, which can achieve long operating life as well as 11-mechanical performance.

Conventional 1114 structure and its problems First, the 114 structure of the conventional capstan drive section and the performance required of the capstan will be described. In FIG. 1, 1 is a capstan, and 2 is a pressure contact portion to which a pinch roller 3 is pressed, and the surface of this pressure contact portion 2 is formed to be rougher than the surface of other portions of the capstan. 4 is the bearing part, which is made of oil renu metal (1~).

The pressure contact part 2 of the capstan 1 is formed with a rough surface as shown in "2", and this is to increase the coefficient of friction between the pinch roller 3 and the capstan 1 and obtain a large tape driving force. .

If the surface of the pressure contact part 2 of the capstan 1 is very smooth, how can the large tape 111 be powered? , 4), it is necessary to press the pinch roller 3 against the capstan 1 with a strong force to generate a necessary frictional force.

However, if the pressing force of the pinch 11-ra 3 becomes large, a strong force will be generated between the capstan 1 and the bearing part 4.

Uneven wear occurs and the rotation accuracy deteriorates by <11. In addition, in the general 14 configuration shown in FIG. 1, the capstan is supported on a cantilever, and if it receives a large pressing force from the pinch roller 3, the capstan 1 may bend, which may cause disturbances in tape running. Therefore, the supporting structure of the capstan 1, including the bearing portion, must be changed to a stronger one, which results in many disadvantages both in general and in general. Therefore, it was virtually impossible to increase the pressing force of the pinch roller 3 against the capstan 1.

In order to improve the performance of carb methane, it is possible to increase the performance of carb methane by applying a relatively large predetermined coefficient of friction.
Conventionally, carbmethane 1 was produced using a downward protrusion 1 as shown in -1. In other words, 7. Chinless Ni14, center and polish 1? A carburethane element body with a fixed shape is formed, and the parts other than the pressure welding part 2 are shielded.
Mask the fi'ci or surface with coach ink and apply Sandplus 1-1 liquid Homing, Chemical Koninotinku, etc. in 2/4-state] J1! The surface of the pressure contact portion 2 was provided with minute irregularities.

The surface roughness of the pressure welding part 2 is determined by the size or density of minute irregularities, but is generally determined by the density of a certain amount of tape. ! ,
1st power! ), the roughness is o,s ~1. oS
k'1' is required.

If the pressure is too high, the friction coefficient will be Vζ, but the tape and the surface of the pinch roller other than the tape will be scraped, and the surface of the resin powder, comb powder, or gear surface will be scraped. I smile. When the above resin powder etc. are applied to the pressure welding part ("I'7!' + Iji! Kashi coefficient suddenly changes in the direction of decreasing, it becomes a good tape 151.
The four dynamic characteristics become < t (difficult to hold) lif+. -・Way 1: t! If the roughness of the part surface is too small, the specified number of threads per stroke cannot be achieved.

In other words, in Table 11 + Roughening process of Zandbranut, Chemical Esochink and other pressure welding parts, an extra lower punch is required for masking when processing the surface layer, which increases the processing time and man-hours. Comment 1- was getting higher.

On the other hand, as described above, the stainless steel bell 11 is often used as the material for the carburetor methane 1, and this is the bearing part 4 and 11.

The hardness of
, wear was likely to occur between the two. It is well known that if the amount of wear increases in the above manner, the rotation performance of the carburetor methane 1 will be adversely affected. This one...
In order to reduce this, the Mli degree of the capstan 1 may be increased to increase the hardness difference between the capstan 1 and the bearing portion 4 to some extent. However, in general, a surface with a high temperature of 7111 degrees is smooth and has a small coefficient of friction, and as mentioned above, the force of the pinch roller's 1st stroke cannot be applied very much. It cannot be used. Therefore, in the conventional carburetor methane drive unit, there was a problem that the production rate of carburethane 14 was high, and rotational performance deteriorated due to wear of the carburetor methane.

The IEi-based invention of the invention, the surface of the
Along with surface addition, I* of the carburetor methane and bearing parts.
Objective 1-1 is to provide a method for producing carb methane that reduces J[) and achieves long life of drive performance.

Structure of the Invention The present invention is characterized in that the surface of a carburethane element body made of stainless steel is subjected to a tinting treatment, and then a barrel bombardment treatment is applied to the surface of the carburethane.
This is a method for producing carbureted methane to obtain a surface with a higher surface area and a uniform height of the convex portions of minute irregularities.

DESCRIPTION OF THE EMBODIMENTS The surface of a carbmethane element body consisting of a stainless steel needle rll with a center coating is subjected to a chlorination treatment.

I'm going to treat this chino! The surface hardness is HkC=70 or more.
), and a so-called high hardness surface is obtained.

In addition, minute irregularities are formed on the surface of the carbmethane element by this tinting treatment. Surface roughness at this time is 0
．． 6-1. It is about O8, and is 111jI, which is optimal for generating a 1-7 constant Seri-Ito coefficient.

Next, perform barrel senma. -Fjj: The easiest way to do this is to put Kenyari and one bottle of gap methane, which has already been treated with a large number of chlorides, into a 114)-shaped body with a lid, and shake the cylindrical body. Yes. Through this polishing treatment, the oxide film on the surface is removed, and at the same time, the height of the convex portions of the minute unevenness portions becomes approximately constant. Therefore, there is no possibility of scraping the deep surface or the pinch roller surface due to the high convex portion, and the force and surface roughness change within a constant range of 1 to 1.

Capsun using the carbmethane obtained as shown in Figure 2. 51 shows the moving parts. 6 is carbmethane which has been subjected to the cyno conversion treatment and the halerui treatment on the 4ゝ side.

-l-,i,L! 11'ij 1jli: In the ・M Yabustan drive part, the capstan surface is too high! ,li
A table of constant roughness il′ii and, if not, sufficient j
≠1 also has a constant value of 8, and a sufficient tape driving force can be generated when the pinch roller presses the tape. The surface of the capstan is sufficiently high (i'jj degree is high compared to the bearing part 4 of oil-less metal '19), there is no damage to the gap methane itself, and there are less shims II and 1? JTh. Therefore, it is possible to maintain a good rotation f111 degrees for a long period of time.

In this practical example, as shown in 1-1 below, carbmethane that provides excellent tape drive performance over a long period of time can be easily and inexpensively produced. Zunawaji, because it is not necessary to provide a rough surface only in a part of the carb methane as in the conventional method,
Conventional masking r: Jl'1' is not necessary, and the manufacturing rice l- is reduced by 1 due to the shortening of processing time and the reduction in man-hours;
I can do something. However, in surface roughening treatments such as Sandbranut and chemical etching, the specified surface roughness must be properly controlled at the third step.However, in this example, it is extremely easy to obtain the specified surface roughness. A desk-like surface is obtained.

Furthermore, the oxidation treatment not only makes the surface curved, but also
Since it is a J1 conversion process, the gear shift < t
(By applying this to Ti, it is possible to provide an electrodynamic bar with the bearing part, which reduces mutual wear and improves the initial rotational performance of the carburetor methane. Incidentally, by barrel polishing PL treatment, the heights of very small convex portions on the surface can be made uniform, and damage to the tape or pinch roller is substantially eliminated.

That's it, the above-mentioned chino conversion treatment υ" 1. Barre/I/Abrasive Soku Tomoj
, :, ;
・Can be realized.

Effects of the Invention The present invention forms a large number of high hardness 1P and minute unevenness by subjecting the surface of a carbmethane element made of Nutenrenu ηfil to a thiosizing treatment, and then forms minute convexities by grinding/L'1ilF. By obtaining a surface with a nearly constant height, the hardness of the surface of the tape driving force can be easily achieved with a small amount of carb methane, which is suitable for domestic production. It proposes a manufacturing method (J5) and will greatly contribute to industrialization.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part of a carburethane drive unit using a Kihe Punukun manufactured by a conventional manufacturing method, and Fig. 2 is a cross-sectional view of a carbmethane drive unit using a Cabsukun produced by a manufacturing method according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a main part of the drive section. 4...Bearing section, 5...Carb methane. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] By subjecting the surface of the gear stan body made of Nutenrene steel to a titanizing treatment, a large number of highly hard and minute irregularities are formed on the surface, and then 1) IJ back surface barrel polishing treatment is performed to improve the fineness. A method for manufacturing a capstan, characterized in that a convex portion is formed on an i11 surface with a substantially constant height.