JPS58208958A - Tape running guide shaft and its manufacture - Google Patents

Abstract

PURPOSE:To keep a tape feeding speed constant at all times, by forming a beltlike pear-skin pattern on a circumference on which a tape contacts for preventing the slip between a guide shaft and the tape. CONSTITUTION:The beltlike pear-skin pattern 2 is formed as a whole on the tape contact circumference of a guide shaft main body 1 for a tape running guide formed into a desired outer diameter. Otherwise, plural number of the pear-skin patterns 2 are formed on the shaft main body 1 axially at a suitable interval. The slip between the guide shaft and the tape is prevented by forming the pear-skin pattern in this way, allowing to keep the tape feeding speed constant at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape running guide shaft and a method for manufacturing the same, and more particularly to a tape running guide shaft having a satin pattern formed on its circumferential surface and a method for manufacturing the same.

Video tape recorders, cassette tape recorders, etc. must provide a constant and stable tape feed speed to the tape in order to function. For this reason, consideration must be given not only to the use of a high-performance motor that rotates at a constant speed, but also to improvements in the guide shaft that directly contacts the tape.

The present invention was created to prevent slippage between the guide shaft and the tape and to provide the tape with an accurate and constant tape feeding speed. It is based on the formation of a band-like satin pattern.

On the other hand, various methods have been conventionally provided for forming a satin pattern. However, it has been found that if these methods are applied directly to the tape running guide shaft, disadvantages arise.

For example, sandblasting has the inconvenience of damaging surfaces other than the surface on which the satin pattern is formed, and to prevent this, it is necessary to take measures to prevent scratches, such as wrapping masking tape. has.

In addition, if a chemical is applied to the entire surface by printing or other means and the chemical is used to corrode the pattern to form a satin pattern, the processing time will be longer because the chemical change will form the pattern, and the layer forming the satin pattern will be thin and easily abraded. This has the disadvantage of causing

Therefore, the manufacturing method of the present invention was developed in order to solve these inconveniences and to provide a satin finish with ease of manufacture. It consists in forming by.

The present invention will be described in detail below with reference to the drawings.

In the figure, reference numeral 33 denotes a guide shaft body for a tape running guide formed with a desired outer diameter. The tape-contacting peripheral surface of the guide shaft main body 1 is formed with a satin pattern 2 having an overall band shape (see FIG. 1).

Further, as shown in FIGS. 2 and 3, a plurality of satin patterns 2 may be formed at appropriate intervals in the axial direction of the guide shaft body 1. In Figure 2, it is 6111 from the tip surface.
111mW on the circumference up to 1! Band-shaped satin pattern 2 at A intervals
and the solid surrounding surface 3 are arranged alternately. Also,
In FIG. 3, 111II! is placed on the circumferential surface from the tip end surface to 5111n, similar to the guide shaft main body 1 in FIG. 2! ! The band-shaped satin pattern 2 and the solid surrounding surface 3 are alternately arranged at intervals, and as a result, two band-shaped satin pattern 2 are formed. The formation of these matte texture patterns 2 is performed by an electrical discharge machine (not shown).

In addition, in the enlarged cross section of the satin pattern 2, the tips of the many protrusions are moderately ground or barreled to prevent them from becoming sharp.
This is done so as not to damage the magnetic material coated surface of the tape, and the dimensions of the tape running guide shaft are made to be highly accurate.

The present invention is constructed as described above, and in the tape running guide shaft, the satin pattern 1 and 2, which have a band-like shape as a whole, are formed on the surface where the tape comes into contact, thereby preventing the tape from slipping and ensuring constant rotation. It is possible to drive the tape at a constant running speed by transmitting the information to the tape.

The satin pattern 2 has a solid shaft circumferential surface 3 with a constant width in the axial direction.
By dividing the tape into a plurality of pieces with a constant width, that is, by forming a plurality of fills in the axial direction so that they are parallel to each other, the effect of preventing the tape from slipping that can be obtained by forming the satin pattern 2 is impaired. In addition, the diameter of the guide shaft can be made as high as 11 degrees (X).

That is, since the matte pattern 2 is not formed on the solid shaft circumferential surface 3, a perfect cylindrical surface can be maintained, and an accurate constant running drive can be applied to the tape. Moreover, the band-shaped satin pattern 2 allows reliable and constant tape feeding without causing slippage between the tape and the guide shaft body 1 during tape feeding.

In addition, since the satin pattern 2 having a band-like shape is formed on the circumferential surface of the guide shaft body 1 by electric discharge machining, the satin pattern 2 can be made uniform, and the disadvantages that occur when forming the satin pattern by sandblasting can be avoided. This eliminates the inconvenience of damaging the shaft peripheral surface where no pattern is formed. Further, since there is no need to apply masking tape or the like to prevent scratches, processing is easy. Further, unlike corrosion caused by chemicals, processing can be carried out quickly, and the satin pattern 112 can be formed thickly, resulting in less wear and tear and improved durability.

In addition, it can be easily automated, and fii
This makes manufacturing more efficient and enables mass production.

As explained above, according to the present invention, it is possible to provide a guide shaft that prevents the tape from slipping, improves the accuracy of the outer diameter dimension of the guide shaft, and can feed the tape at an accurate and constant speed. It has been found that it is easy to manufacture, does not damage the other circumferential surface, and has other effects such as obtaining a uniform satin pattern.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is an overall front view of a guide shaft, and FIGS. 2 and 3 are overall front views of guide shafts of other embodiments. 1...Guide shaft body, 2...Nashiji pattern, 3...Solid shaft circumferential surface. Patent Applicant Sanwa Needle Bearing Co., Ltd. 2nd Cause Figure 3

Claims (1)

[Scope of Claims] 1. A tape running guide shaft, characterized in that the tape running guide shaft has a satin-finished pattern in the form of a band all over the circumferential surface with which the tape comes into contact. 2. The satin pattern is formed by dividing into a plurality of pieces each having a certain width in the axial direction by a solid shaft peripheral surface having a certain width.
Tape running guide shaft as described in section. 3. A method for manufacturing a tape running guide shaft, which comprises forming a satin pattern in the form of an entire band on the circumferential surface of the guide shaft body by electrical discharge machining.