JPS60234206A - Repolishing disk for stylus tip - Google Patents

Abstract

PURPOSE:To repolish a worn-out reproduction stylus by providing the polishing performance to a disk and also forming a V-shaped groove in a zigzag form to the rotary center of the disk. CONSTITUTION:A repolishing disk 6 for stylus tip is made of a material containing mainly polyvinyl chloride. Then diamond, or glass, etc. is mixed into the polyvinyl chloride or the polishing fine grains are coated on the disk in order to secure the polishing performance for the disk 6. A V-shaped groove having its intensive angle varying in a range between 60 deg. and 90 deg. is formed to the disk 6 in a zigzag form to the rotary center. A worn-out reproduction stylus is put into the groove 7, and the worn-out edge part of the stylus tip is polished in a short time. Thus a worn-out stylus tip can be sharpened again.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 11. The present invention relates to a disc for re-polishing the tip of a playback stylus attached to a pickup cartridge of a record player.

(Constitution of Conventional Example and its Problems) The current state of the regeneration needle mounted on the pickup car 1 to the cartridge of a record player will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows the tip of a regenerated needle, and the needle tip 1 is fixed to the tip of a cantilever 2.

Although not shown in the figure, the regeneration needle is attached to the pickup cartridge at the end of the cantilever 2. Second
The figure is a cross-sectional view of the tip of needle tip 1, where needle tip 1 has a conical apex angle θ
It is formed of a conical surface 3 with a slightly swollen center with a radius of about 60 degrees, and a tip 4 rounded to a predetermined radius of curvature r.

The playback needle attached to the pickup cartridge of a record player is used to extract musical sound signals recorded from a 45-45 stereo record or a monaural record. 2- Insert the needle tip 1 into the carved sound groove with an included angle of 90 degrees,
It plays the role of following the sound groove as the record rotates and transmitting musical sound signals as vibrations to the pickup cartridge.

The tip of a recycled needle is generally made of zaphire, diamond, etc., but even the tip 1, which is made of the hardest material such as diamond, can be used for hundreds of hours, as shown in Figure 3. The contact part 5 between the conical part 3 of the record I (the sound groove and the stylus tip) is worn out, and the sound groove of the record is worn out, as shown in the cross-sectional view of the tip of the used stylus tip in Figure 4. Wear surfaces 5a and 5b are created along included angles of 90 degrees.

When worn surfaces 5a and 5b are formed on the conical surface 3 of the tip 1, the edges formed at the boundary between the conical surface 3 and the worn surfaces 5a and 5b may scrape the sound groove or cause distortion of the reproduced sound. This not only hindered the reproduction of faithful musical tones, but also shortened the lifespan of the record.

At this point, the recycled button had reached the end of its useful life and was replaced with a new recycled button and discarded. Conventionally, there was no other option than to discard the recycle button at the end of its life, no matter how expensive the material used for the needle tip.

(Objective of the Invention) The present invention provides a method and an apparatus for restoring a recycled needle whose tip is worn out and considered used, without discarding it, to the state before use and making it possible to reuse it. .

(Structure of the Invention) The present invention provides grooves having a V-shaped cross section with an included angle varying from 60 degrees to 90 degrees on the surface of a disk-shaped disk that has been provided with grindability. By tracing the inside of this groove with the worn tip of the recycled button that has reached the end of its life, the conical surface and the worn surface are formed around the edge of the conical surface of the needle tip and the worn surface. The product is polished in a short period of time to restore it to its pre-use condition.

(Description of Embodiment) An embodiment of the present invention will be described with reference to FIGS. 5 to 7.

In FIG. 5, the needle tip re-sharpening disk 6 is made of a plastic material that has been given sharpening properties, and has grooves on its surface having a V-shaped cross-sectional shape with an included angle varying from 360 degrees to 90 degrees. , is formed in a large zigzag shape with respect to the center of rotation. After placing the disc 6 on the turntable of the record player, placing the playback button that should have reached the end of its life on the pickup car 1 to the cartridge of the 1-horn arm, and turning on the drive switch to rotate the turntable. , move the 1~-n arm to set the needle tip 1 of the regenerated needle.
into the groove 7 of the disk 6.

FIG. 6 shows a cross-sectional view taken at a position where the edge of the conical surface 3 of the needle tip and the worn surfaces 5a and 5b and the groove surface of the groove 7 of the needle tip re-sharpening disk 6 come into contact. While the tip of the needle passes through the top of the undulation of the groove 7 of the disk 6, the conical portion
The four corner edge portions of the cross section 8 are sequentially polished. As the needle tip 1 follows the undulating groove 7 whose included angle varies from 60 degrees to 90 degrees, the edge portion is polished over the entire circumference and restored to the state before use.

The gold 1-point re-grinding disk 6 imparted with abrasiveness can complete polishing in a short time due to its good abrasiveness.

Needle tip required for polishing needle tip 1] and needle tip re-polishing disk 6
The pressing force between the disc 6 and the groove 7 is determined by the rotational resistance during rocking of the tone arm, the gold pressure, the sliding speed of the stylus tip 1 in the groove of the disc 6, the degree of zigzag, and the groove 7. It is generated depending on various factors such as the included angle of , and acts as an inward pushing force and an outward pushing force.

In addition, as shown in FIG. 7, the groove 7 of the needle tip re-sharpening disk 6 is appropriately undulated in the vertical direction with respect to the disk surface for the worn surface 9 that has occurred on the tip 4 of the needle tip 1. By forming the edge portions 9a and 9b at both ends of the edge portion of the conical surface 3 and the abrasion surface 9 in the rotation direction, the included angle of the groove 7 is changed from 60 degrees to 90 degrees, so that the edge portions 9a and 9b are in contact with the conical surface 3 and wear. Edge portion 9 in the radial direction of the edge portion with surface 9
c can be polished and restored to its pre-use condition.

The abrasiveness of the needle tip re-sharpening disk can be achieved by molding it with a plastic material whose main component is vinyl chloride mixed with diamond, glass or carbon fiber, or by molding it with a plastic material containing vinyl chloride as a single strand. It is obtained by molding a plastic material and then applying abrasive particles or coating the surface.

Appropriate re-polishing is possible by adjusting the polishing conditions by using a liquid abrasive, adjusting the suction pressure, and changing the undulations of the grooves 7, the shape of the zigzags, etc. Furthermore, it goes without saying that the degree of re-polishing can be adjusted by selecting the rotational speed of the disk.

In FIG. 5, the groove 7 of the needle tip re-sharpening disk 6 was explained as a groove that goes around the disk 6, but it is possible to form a plurality of grooves of various types with different undulations on the same disk. Alternatively, a spiral groove that can be completed with several rotations may be formed.

As a second embodiment, a check signal of a constant frequency and a musical tone signal are simultaneously recorded in the grooves 7 having large undulations of the four-point re-polishing disk 6, and the degree of re-polishing is determined by
! It can be configured so that it can be monitored using an instrument or confirmed by ear.

7- As a third embodiment, in a normal record, a groove for re-polishing the stylus tip is formed using the outermost circumference and/or the innermost circumference of the tone groove for musical sound signals. It is also possible to form an independent tip re-polishing groove that does not communicate with the tone signal groove.

(Effects of the Invention) As explained above, according to the present invention, a recycled button that is discarded at the end of its life can be restored to the state before use in a short period of time, and without discarding an expensive recycled needle, at least conventional This makes it possible to extend the lifespan of the product by a factor of two to several times.

[Brief explanation of drawings]

Figure 1 is a perspective view of the tip of the recycling button, Figure 2 is a sectional view of the needle tip in Figure 1, Figure 3 is a perspective view of the tip of the used recycled t11, and Figure 4 is Figure 3. FIG. 5 is a plan view of a disc for re-polishing the needle tip according to the present invention; FIG. 6 is a cross-sectional view showing the polished state of the edge of the worn surface formed on the conical surface of the needle tip; FIG. FIG. 7 is a longitudinal sectional view showing the polished state 8- of the edge portion of the worn surface produced at the tip of the needle tip. 1. Tip of the sword, 2. Cantilever, 3. Conical surface.
4. Tip, 5 Contact portion, 5a, 5b. 9. Worn surface, 6. Gold 1 tip re-polishing disc,
7- Groove, 8...Cross section of conical part, 9a, nb, 9c
Edges of worn surfaces. Patent applicant Matsushita Electric Industrial Co., Ltd. 9- Figure 1 Figure 5 Figure 6 Figure 7

Claims (3)

[Claims] (1) Grooves with a V-shaped cross-section with an included angle varying from 60 degrees to 90 degrees are formed on the surface of a disc-shaped disk that has been given grinding properties in a large undulation or zigzag shape with respect to the center of rotation. A disc for re-polishing the tip of a sword, which is characterized by the fact that it is formed. (2) The needle tip re-polishing disk according to claim (1), wherein diamond, glass, or carbon fiber is mixed as an abrasive material that imparts grindability to the disc-shaped disk. (3) The needle tip refill according to claim (1), characterized in that the disk surface is coated with abrasive particles or coated as a means for imparting abrasiveness to the disc-shaped disk. Abrasive disc.