JPS61230821A - Shaft having circumferential face formed with crepe pattern and forming method of crepe pattern - Google Patents

Abstract

PURPOSE:To form slip prevention patterns effectively onto the shaft face by pressure contacting a shaft through a press body against the pressure contact face of a hard pressure contact body having crepe pressure contact face then reciprocating the press body in parallel with the pressure contact face. CONSTITUTION:A hard pressure contact body 2 is formed with a rectangular resin bond grinding wheel having same thickness with the length of the face of shaft 1 to be formed with crepe pattern then secured. Thereafter, a resilient press body 3 made of hard rubber is arranged in parallel with said body 2 to arrange the shaft 1 between the pressure contact face 4 and the pressing face 5 and to reciprocate the press body 3 while pressing the shaft by means of the press body 3. Consequently, the shaft 1 is formed with crepe pattern on the surface while rotating.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a shaft having a satin pattern formed on its circumferential surface and a method of forming the satin pattern, and relates to a shaft with a satin pattern formed on the circumferential surface and a method for forming the satin pattern. To make it easier to form a satin pattern to prevent slipping on the circumferential surface of shafts used for structures and other guides, and to make the satin pattern optimal for preventing slipping in the usage conditions. The present invention relates to a shaft having a satin pattern formed on its circumferential surface, and a method for forming the satin pattern.

[Technical background of the invention and its problems] A tape drive mechanism of a device that stores and reproduces audio or video on a tape, such as a tape recorder or a video recorder, has a tape running shaft and an elastic material such as rubber. The tape is sandwiched between two pinch rollers, and the tape running shaft is rotated at a constant speed, thereby running the tape at a constant speed and eliminating unevenness (hereinafter referred to as wow and flutter).

Conventionally, in order to suppress the wow and flutter, research and development has been carried out to improve the roundness of the tape running shaft as much as possible, and
Research was being conducted to improve various types of accuracy in order to eliminate uneven rotation of the drive motor, and attention was focused only on these points.

However, when we actually researched the causes of wow and flutter, we found that it was not only due to the roundness of the tape running shaft and uneven rotation of the drive motor, but also due to the tape feeding caused by the tape running shaft and the pinch roller. Slips were also found to be one of the major causes.

Therefore, we strengthened the pressure contact between the tape running shaft and the pinch roller to achieve FI! I tried to increase the friction force, but the tape running shaft is very thin due to the mechanical structure of tape recorders and video recorders, so if you apply more than a certain amount of pressure, the tape running shaft will bend. This method has the disadvantage that the tape gets scratched, which increases distortion and noise, and there is a limit to how much pressure can be increased.

Therefore, when the tape abutting surface of the tape running shaft was made to have a satin pattern, there was almost no slippage between the tape running shaft and the tape, resulting in extremely good tape running with little wow and flutter.

In addition, when press-fitting gears, worm screws, pulleys, discs, etc. to various shafts used in tape drive mechanisms and guides, recent efforts have been made to increase the pull-out strength when press-fitting, thereby eliminating the need for keys. Both are designed to transmit sufficient driving force.

In this case as well, by forming a satin pattern on the circumferential surface of the shaft, the punching strength was significantly increased, and a satisfactory punching strength was obtained.

However, methods for forming satin patterns on the predetermined peripheral surfaces of tape running shafts and other shafts include sandblasting, surface nitriding, chemical porous etching,
Examples include chemical etching methods, coating methods, local heating methods (methods for forming oxide films locally), and local plating methods, but each method has its own drawbacks.

In other words, in the sandblasting method, it is necessary to form a satin pattern only on a predetermined peripheral surface, so the other parts must be masked, which increases the cost, and the amount of abrasive grains that are injected increases. Since large scratches are likely to occur due to scratches caused by scratches, and unevenness in the satin finish is also likely to occur, the formed satin finish pattern cannot be said to be good and has disadvantages that have an adverse effect.

In addition, since the surface nitriding method involves heating the entire shaft, nitriding creates unevenness on the entire surface of the shaft.
Other than the tape contact surface, for example, the bearing portion of the tape running shaft is also subjected to nitriding treatment, making it unusable, and the entire surface is heated at high temperatures, resulting in bending.

Furthermore, with the chemical porous etching method, materials must be specially selected and the roughness differs depending on the material, making it extremely difficult to select the roughness of the satin pattern, and the formation itself is large-scale. Similar to the sandblasting method, the chemical etching method has the disadvantage of requiring a lot of masking work, and it is difficult to form uniform unevenness, and the protrusions tend to be rounded compared to the roughness. It has drawbacks such as a low coefficient of friction.

The coating method has the disadvantage that if the shaft itself is used very frequently, the coating layer itself must be made very strong, and the coach ink for this must be very expensive. In the local heating method, only a predetermined area is heated and slowly cooled, so there is a risk that the bearing part of the shaft will become dull and hardness will decrease.
~ itself is made with very high precision, so heating it will inevitably reduce the precision, and the satin pattern formed by heating is an oxide film, so the film itself is very thin. The drawback is that it quickly disappears after a few uses.

In the local plating method, the plating itself is carried out through a chemical reaction, etc., so the surface roughness is unstable, and it has the disadvantage of being too rough and damaging things it comes into contact with.In addition, like the chemical etching method, masking Moreover, there is also the disadvantage that the outer diameter of the shaft becomes thicker than the standard size due to the uneven thickness of the plating layer, or the roundness becomes poor, and the plating process time is also long, which increases the cost. It also led to

In other words, none of these methods can provide a satisfactorily satined pattern, and when the shaft is used as a tape running shaft, the tape is often full of scratches. Both methods have the drawback of requiring manual labor, requiring long processing times, and lacking in mass production.Furthermore, they require the use of chemicals and parts that are consumed during the processing process, consumables such as abrasive grains, and consumable tools. Since the cost also increased, it was inevitable that the cost would be relatively high.

[Object of the invention] The present invention solves all the above-mentioned drawbacks, and makes it possible to easily create a very good satin finish pattern on a predetermined peripheral surface of a shaft in order to prevent slippage and increase extraction strength in a short time and at a low cost. It was created with the aim of making it possible to form

[Summary of the Invention] In order to achieve the above object, the shaft according to the present invention has a satin pattern formed on its circumferential surface, and the shaft has a satin pattern formed of countless minute recesses on the circumferential surface, and the recesses themselves have a satin pattern. Furthermore, the method for forming a matte pattern on the circumferential surface of a shaft according to the present invention involves forming a hard press-welded body having a matte-like press-contact surface in the process of finishing the circumferential surface of the shaft; The method consists in pressing the surface of the shaft on which the satin pattern is to be formed on the pressing surface of the hard pressing object with a pressing body, and operating the pressing body so that the pressing surface reciprocates in parallel with the pressing surface. It is.

[Embodiments of the Invention] The present invention will be described in detail below with reference to the drawings.

A device for recording and reproducing audio or video on a tape, such as a tape recorder as shown in FIG. 8 or a video recorder (not shown), uses an elastic material such as rubber to feed the tape T at a constant speed. The tape is driven and rotated by a pinch roller P and a servo motor M, etc. A tape drive mechanism is constructed such that the tape T is held under pressure by the foot 1.

However, when the tape T is connected to the shaft 1 and the pinch roller
Even if the tape is clamped and held under pressure by P, the tape will slip slightly when the tape is fed as described above. Therefore, in order to prevent slipping, a satin pattern was formed at a predetermined position within the circumference during the finishing process of the shaft 1 by the method shown in each of the following examples, and a good satin pattern was easily obtained in an extremely short time. was completed.

That is, in the first embodiment, as shown in FIG. 1, the hard press-welded body 2 is formed using a rectangular plate-shaped resin bond grindstone having the same thickness as the width of the surface on which the satin pattern is to be formed on the shaft 1. and fix it.

For example, a pressing body 3 made of an elastic material such as hard rubber or synthetic resin is arranged parallel to the hard pressing body 2. The shape of the pressing body 3 is a rectangle having approximately the same thickness as the hard pressing body 2, and the long sides of the rectangular shape and the cylindrical shape of the shaft 1 are perpendicular to each other. put. The end surfaces of the opposing long sides are a pressing surface 4 on the hard pressing body 2 and a pressing surface 5 on the pressing body 3, with the shaft 1 sandwiched between the pressing surface 4 and the pressing surface 5. 5, the shaft 1 is brought into pressure contact with the pressure contact surface 4. Therefore, the pressing body 3 is operated so that its pressing surface 5 reciprocates parallel to the pressing surface 4. Then, the shaft 1 is pressed against the pressing surface 4 by the operation of the pressing body 3 and rotates.

At this time, since the press-contact surface 4 has a satin-like texture formed by the hard press-contact body 2 using a resin bond grindstone, the satin pattern is transferred to the circumferential surface of the shaft 1/foot 1 with a width equal to the thickness of the hard press-contact body 2. Ru.

Moreover, contrary to the above, the same effect can be achieved even if the hard pressing body 2 is formed of the elastic material and the pressing body 3 is formed of a hard material having a satin-like surface.

If you enlarge the satin pattern formed in this case, you will see that the 7th
As shown in the figure, countless recesses 6 are formed by the abrasive grains of the resin bond grindstone, and the recesses 6 themselves have fine irregularities, and each corner thereof is formed to be sharp to some extent. As a result, these fine irregularities catch on the minute irregularities on the surface of the tape 1, increasing the frictional force. In reality, the surface roughness of the satin pattern due to the recesses 6 is as follows:
The roughness is set to suit the application. Then, the fine irregularities of the recesses 6 become even finer surface roughness, so that only the frictional force can be increased without causing any damage to the tape T.

Further, the hard pressing body 2 may be a vitrified grindstone, a rubber bond grindstone, or FIG. 6(A).

Diamond material such as metal bond type or resin bond type or electrodeposition as shown in (0), borazone CBN material such as metal bond type or resin bond type or electrodeposition, and It may be formed using a vitrified borazone grinding wheel, and in these cases, the grain size setting and usage conditions are the same as in the case of the resin bonded grinding wheel, and the effect is the same as above. It is possible to increase only the frictional force without causing any damage. and a diamond material such as metal bond type or resin bond type or electrodeposition, borazone CBN material such as metal bond type or resin bond type or electrodeposition,
In the case of a vitrified borazone grindstone, etc., although it is more expensive than a resin bonded grindstone, there is almost no wear and tear, so there is no need to dress the grindstone or replace the grindstone, making it very efficient.

Furthermore, as shown in FIG. 6(d), the hard press-welded body 2 is made of a cemented carbide material, and one surface of the cemented carbide material is previously formed into a matte pattern by electrical discharge machining. Alternatively, as shown in Figure 6 (e), high speed tool 04
It is also possible to use a material made of a high-hardness special steel material such as (SKH), and one surface of which has been previously formed into a matte pattern by electrical discharge machining or dry or wet sandblasting.

In that case, the electrical discharge machining or sandblasting is
The processing must be carried out so that the surface to be processed has a uniform unevenness and a desired surface roughness. Therefore, the electrical discharge machining speed, the particle size of the abrasive grains used for sandblasting, and the sandblasting conditions must be set so that the surface roughness of the satin pattern on the circumferential surface becomes a roughness suitable for the purpose as described above. In the figure, 12 is an electrode used for electric discharge machining, 13 is a nozzle used for sandblasting, and 14 is an abrasive grain.

Next, in the second embodiment, the pressing body 3 is reciprocated in the same manner as described above, and the hard pressing body 2 itself is also reciprocated so that the pressing surface 4 is in the surface direction and in the opposite direction to the pressing surface 5 of the pressing body 3. The shape and material of the hard pressing body 2 and the pressing body 3 are the same as in the first embodiment.

As a result, the shaft 1 rotates on its own axis on the pressure contact surface 4 in the same manner as in the first embodiment, but the operating distance of the pressure member 3 is reduced by eliminating the public expense of the hard pressure member 2 operating in the opposite direction to the pressure member 3.
If the hard pressure contact body 2 is operated at the same speed, the operating distances of the hard pressure contact body 2 and the pressing body 3 will both be half of those of the first embodiment, and the operating time can be shortened accordingly.

In addition, in the third embodiment, as shown in FIG. 3, the satin pattern on the circumferential surface of the shaft 1 is formed into multiple stripes, and in this case, the matte pattern on the circumferential surface of the shaft 1 is formed in a plurality of strips. Either an appropriate number of grooves 7 are carved to leave enough pressure contact surface 4 for the number of satin-finished patterns to be formed on the circumferential surface of the shaft, or alternatively, although not shown in the drawings, the width of the matted-pattern pattern is the same as the width of one satin-finned pattern. Hard pressure welding body 2 with dimension thickness
A pressure contact surface 4 is formed by placing a plurality of sheets together at appropriate intervals using something like a spacer, and if the shaft 1 is pressed against these pressure contact surfaces 4 as in the first embodiment and rolled, a plurality of strips can be formed. A satin-like pattern can be easily formed.

In the fourth example, as shown in FIG. A resin bonded grindstone was used in the same way as the hard pressure welding body 2 of the embodiment. In this case, similar to the hard pressure welding body 2 as shown in FIG. Borazon CBNU, hydrified borazone grindstones, cemented carbide materials with a satin pattern formed on one side by electric discharge machining, and high hardness special steel materials with a satin pattern formed in advance by electric discharge machining or dry or wet sandblasting. zb may be used.

According to the fourth embodiment, since both the pressing surface 4 and the pressing surface 5 have a satin-like texture, one circumferential surface of the shaft can be covered by approximately half the operation when only the pressing surface 4 has a satin-like texture. A satin pattern can be formed at a predetermined position. Therefore, it is possible to reduce the time required to form a satin pattern.

Furthermore, if the hard press member 2 in the fourth embodiment is operated as in the second embodiment, as in the fifth embodiment shown in FIG. can do.

When the satin pattern on the circumferential surface of the shaft 1 formed by each of the above-described embodiments is enlarged as shown in FIG.
It is made up of countless recesses 6 formed by the unevenness of the pressure contact surface 4 of the hard pressure contact member 2, and the recesses 6 themselves have fine unevenness, and the corners of each of the fine unevenness are sharply pointed to some extent. Therefore, these fine irregularities are caused by tape 1.
It catches on minute irregularities on the circumferential surface and increases the frictional force, thereby eliminating slippage between the shaft 1 and the tape T.

When actually comparing the usage conditions of the shaft 1 with a satin pattern formed thereon and the shaft 1 without a satin pattern formed thereon, it was found that the shaft 1 without a satin pattern formed thereon was 10th As shown in the figure, after 30 minutes, due to the slip between the shaft 1 and the tape T, a phenomenon occurs in which the audio frequency characteristic waveform 8 significantly decreases and the wow and flutter characteristic waveform 9 increases. However, as shown in FIG. 11, the shaft 1 formed with the satin pattern shows almost no change in both the audio frequency characteristic waveform 10 and the wow and flutter characteristic waveform 11, making it possible to run the tape stably. The results were obtained. Note that the tape used for this comparison was a tape that had been used for a long time, so that slipping between the shaft 1 and the tape T was likely to occur, and even if such tape was used, the audio Since there is almost no change in the frequency characteristic waveform 10 and the wow/flutter characteristic waveform 11, the slip does not occur at all when a tape that has been used for a short period of time is used. or,
As shown in FIGS. 9(a) to 9(d), by appropriately setting the satin pattern that is most suitable for the compatibility with the tape T, slip prevention becomes more reliable.

As mentioned above, the time required to form the satin pattern can be extremely short because it is formed by pressing the shaft 1 against the hard pressing body 2 and transferring it in a rolling manner. It is sufficient to form the satin pattern on the shaft 1 in just a few tenths of a second, and the process can be instantaneous, making it suitable for mass production.

Furthermore, when the hard pressure welding body 2 becomes worn, it is sufficient to regrind the above-mentioned grindstones, and almost no consumable tools or other consumables are required, so it can be formed at a very low cost.

Further, as described above, the apparatus for carrying out the method according to the present invention reciprocates the pressing body 3 parallel to the hard pressing body 2, or the hard pressing body 2 and the pressing body 3 are parallel to each other and Any type of device may be used as long as it is operated so that one side moves in the opposite direction with respect to the other side.

The satin pattern formed in this way is used not only to prevent slips between the shaft 1 and the tape T, but also to improve the extraction strength when a gear, worm screw, pulley, disc, etc. is press-fitted into the shaft. To increase. It is also effective in increasing the adhesive strength when these items are bonded and fixed with an adhesive. Alternatively, it is also highly effective in increasing the strength to remove a flywheel, a motor shaft's 0-tar, a commi-cheater, a fan, etc., into the shaft. In addition to shafts, the pullout strength increases significantly when shrink fitting a sleeve and a flywheel or shrink fitting a metal and a bearing. Very good results were also obtained when used to increase the strength when press-fitting a shaft into a frame or the like. In other words, the satin texture pattern formed in this manner has a wide range of applications in various fields.

[Effects of the Invention] According to the present invention configured as described above, in the process of finishing the peripheral surface of the shaft 1, the hard pressure contact body 2 having the matte-like pressure contact surface 4 is formed, and the pressure contact surface 4 of the hard pressure contact body 2 is formed. By pressing the surface of the shaft 1 on which the satin pattern is to be formed by a pressing body 3 and operating the pressing body 3 so that its pressing surface 5 reciprocates in parallel with the pressing surface 4, Since the satin pattern on the press contact surface 4 of the hard press contact body 2 is transferred to the circumferential surface of the shaft 1, the satin pattern can be formed on the shaft 1 in an extremely short time, and almost no consumable tools or other consumables are required. do not. In addition, since the work is simple, simply pressing the peripheral surface of the shaft 1 against the pressing surface 4 of the hard pressing member 2 and reciprocating the pressing member 3, it can be easily automated, making it extremely suitable for various situations. This means that the traditional manual process of forming the satin pattern is completely eliminated.

As described above, the hard pressure welding body 2 is made of diamond material such as a resin bond grindstone, hydrified grindstone, rubber bond grindstone, metal bond type, resin bond type, electrodeposition, etc. Borazon CBN material, hydrified borazone grindstone, etc. are used to form a satin pattern on the circumferential surface of the shaft 1 consisting of countless minute recesses 6, and the recesses 6 themselves are formed by further minute irregularities. By doing so, minute irregularities can be caught on minute irregularities of the tape T, increasing the frictional force, and stable tape running is possible with almost no slippage between the tape T and the shaft 1. Furthermore, when various parts are press-fitted into the shaft 1, the extraction strength can be increased.

As explained above, according to the present invention, an anti-slip satin pattern can be formed on the circumferential surface of a shaft in a very simple process and in a short time, and almost no consumable tools or other consumables are required. Moreover, it is a simple device that is very suitable for automation and mass production, and can be provided at low cost.By using the formed shaft, stable operation without slipping can be obtained during tape running.
Furthermore, it provides various excellent effects such as being able to increase the pull-out strength when press-fitting various parts into the shaft.

[Brief explanation of the drawing]

1 to 5 show embodiments of an apparatus for carrying out the present invention, FIG. 1 is a perspective view of the main part of the first embodiment, FIG. 2 is a perspective view of the main part of the second embodiment, 3 is a perspective view of the main part of the third embodiment, FIG. 4 is a perspective view of the main part of the fourth embodiment, FIG. 5 is a perspective view of the main part of the fifth embodiment, and FIG. 6 is a hard pressure welding FIG. 7 is an enlarged cross-sectional view of the main part of the circumferential surface of the shaft formed according to the present invention; FIG. 8 is a perspective view showing the attached state of the tape running shaft; FIG. 9 is a perspective view showing the tape running shaft. An enlarged front view of the main parts showing the contact state between the shaft and the tape,
Fig. 10 is a waveform diagram showing the characteristics of audio frequency and wow and flutter when a tape running shaft without a satin pattern formed on the circumference is used, and Fig. 11 is a waveform diagram showing the characteristics of a tape running shaft formed according to the present invention. FIG. 3 is a waveform diagram showing characteristics of audio frequency and wow and flutter when B...tape drive vJ mechanism, M...servo motor,
P...Pinch roller-1 ■...Tape, 1...Shaft, 2...Hard pressure contact body, 3...Press body, 4...
- Pressure contact surface, 5... Pressing surface, 6... Recess, 7... Groove, 8... Audio frequency characteristic waveform, 9... Wow and flutter characteristic waveform, 10... Audio frequency characteristic waveform, 11...
・Wow and flutter characteristic waveform. Figure 1 @ Figure 2 Figure 3 Figure 4 @ Figure 5 @ Figure 9 (A) (B) 6 Figure 10 Figure 1I Figure 7

Claims (1)

[Scope of Claims] 1. A satin-finished pattern is formed on the circumferential surface, which is characterized by forming a satin-finished pattern consisting of countless minute recesses on the circumferential surface, and the concave portions themselves are formed by further minute irregularities. Formed shaft. 2. In the process of finishing the circumferential surface of the shaft, a hard press member having a satin-like pressing surface is formed, and the surface of the shaft on which the satin pattern is to be formed is pressed onto the press contact surface of the hard press member using a pressing member. A method for forming a satin pattern on a peripheral surface of a shaft, characterized in that the pressing body is operated so that its pressing surface reciprocates in parallel with the pressing surface. 3. The method for forming a matte pattern on the circumferential surface of a shaft as set forth in claim 2, wherein the hard pressing member operates so that the pressing surface reciprocates in the direction of the pressing member and in the opposite direction to the pressing member. . 4. The method for forming a satin pattern on the circumferential surface of a shaft according to claim 2 or 3, wherein the pressing surface of the pressing body has a satin texture similar to the pressing surface of the hard pressing body. 5. Claim 2, 3, or 4, characterized in that the hard press-welded body is formed by a resin bonded grindstone.
A method for forming a satin pattern on the circumferential surface of a shaft as described in Section 1. 6. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 2, 3, or 4, wherein the hard pressure-welded body is formed of a vitrified grindstone or a rubber bond grindstone. 7. The hard pressure welding body is made of a metal bond type, resin bond type, or electrodeposited diamond material, etc. of the shaft peripheral surface according to claim 2, 3, or 4. Satin pattern forming method. 8. The shaft peripheral surface according to claim 2, 3, or 4, wherein the hard press-welded body is made of a metal bond type, resin bond type, or electrodeposited borazone CBN material. How to form a satin pattern. 9. The method for forming a matte pattern on the circumferential surface of a shaft as set forth in claim 2, 3, or 4, wherein the hard press member is a vitrified borazone grindstone. 10. Claims 2 or 3, characterized in that the hard press-welded body is made of a cemented carbide material that is formed in advance into a satin pattern on one side by electrical discharge machining to form a press-welded surface. Or the method for forming a matte pattern on the circumferential surface of a shaft according to item 4. 11. The hard press-welded body is made of a high-hardness special steel material that has been previously formed into a matte pattern by electrical discharge machining or dry or wet sandblasting to form a press-welded surface. The method for forming a satin pattern on the circumferential surface of a shaft according to item 2, 3, or 4. 12. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 2 or 3, wherein the pressing body is made of an elastic material such as hard rubber or synthetic resin. 13. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 4, wherein the pressing body is formed by a resin bonded grindstone. 14. Claim 4, characterized in that the pressing body is formed of a vitrified grindstone or a rubber bond grindstone.
A method for forming a satin pattern on the circumferential surface of a shaft as described in Section 1. 15. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 4, wherein the pressing body is made of a metal bond type, resin bond type, or electrodeposited diamond material. 16. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 4, wherein the pressing body is made of a metal bond type, resin bond type, or electrodeposited borazone CBN material. 17. The method for forming a matte pattern on the circumferential surface of a shaft according to claim 4, wherein the pressing body is made of a vitrified borazone grindstone. 18. The circumferential surface of the shaft as set forth in claim 4, wherein the pressing body is made of a cemented carbide material that is formed in advance into a satin pattern by electric discharge machining to form a pressing surface. How to form a satin pattern. 19. Claim 4, characterized in that the pressing body is made of a high-hardness special steel material that has been previously formed into a satin pattern on one side by electric discharge machining or dry or wet sandblasting to serve as a press contact surface. A method for forming a satin pattern on the circumferential surface of a shaft as described in Section 1.