JPS60261060A - Tape guide - Google Patents

Abstract

PURPOSE:To form a guide pin excellent in wearproofness by employing a material coated with powder mixed in the ratio of 50-70% Al2O3 and 30-50% TiO2 as a material for the guide pin to smooth tape running. CONSTITUTION:The guide pin is made of materials such as mixed powder of 50-70% Al2O3 and 30-50% TiO2 having good lubrication and wearproofness applied to the surface of a cylindrical SUS304 raw material 10 through coating 11 by means of the explosion thermal spray method. In case of the explosion thermal spray, the mixed gas between acetylene and oxygen is exploded and the mixed powder of Al2O3 and TiO2 is mixed in the high speed fuel energy to attain coating. As a result, the tape running is attained smoothly because of good lubrication of the coating face and the tape guide with excellent wearproofness is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a tape guide used in a magnetic recording/reproducing device.

[Prior art 1] In a magnetic recording and reproducing device such as a video cheap recorder (hereinafter referred to as VTR), a tape is pulled out from a cassette mounted on a reel stand, and wound through a cylinder having a rotating magnetic head to run the tape. A tape guide is generally used as a guiding means. FIG. 1 is a plan view showing the main parts of the VTR after tape loading and unloading.

1 is a cassette in which a tape is stored, and 2 is a tape pulled out from the cassette.

The tape guide pins 4, 5 and guide rollers 3, 6 provided in the VTR are located inside the cassette as shown by the broken line when the cassette 1 is loaded, but they are moved in the direction of the arrow by a loading command. The tape is mounted on Schilling 9 over approximately half the circumference. At this time, the outer tape 2 is guided in its running by tape guide pins 4 and 5. In addition, 7 is a capstan, 8 is a pinch roller, and the capstan 7 and pinch roller 8 are used during recording, playback, etc.
The tape is crimped with the tape in between, and the tape is driven.

Conventionally, tape guides have been made of polished stainless steel or polished ceramic. Although these tape guides have low lubricity on the tape sliding surface, scratches are easily caused by sliding on the tape surface, and especially with metal tapes, adhesion and slipping occur alternately and continuously on the sliding part. This has the disadvantage that a stick-slip phenomenon occurs, which causes tape squeal and adversely affects the performance of the printer.

[Objective of the Invention 1] An object of the present invention is to provide a tape guide for use in a magnetic recording/reproducing device, which allows the tape to run smoothly and has excellent abrasion resistance.

[Configuration of the invention 1 This invention will be described below with reference to examples.

As shown in FIG. 2, one embodiment of the guide pin of the present invention involves polishing the cylindrical surface of a cylindrical material 10, such as a 5US3041 trowel, having a predetermined diameter and length, and polishing the cylindrical surface to a predetermined thickness. with high conductivity.

The coating 11 is made of a material having wear resistance and lubricity. After coating, the coated surface is appropriately polished.

The surface of the material 10 does not need to be polished.

This guide pin is the tape guide pin 4 in FIG.
5. Others that come in sliding contact with the tape, but are used for the id pins 7. The method of manufacturing the coating is to use a metal material for the tape guide body, and coat the contact surface with the tape with a mixed powder of Al2O and TiO2, which has good lubricity and wear resistance. The material is coated using explosive thermal spraying.

As shown in Figure 3, a mixed gas of acetylene and oxygen is exploded, and the resulting high-velocity fuel energy is used to coat the material with powder spray material.

To explain step by step, first, measured amounts of acetylene and oxygen are introduced into the water-cooled gun barrel 21, and Af! , 203 and Ti
It is mixed with a coating material made of mixed powder of O2.

,* is ignited by the Kubrag 22, and at this time, the inside of the gun barrel 21 becomes high temperature and the gas flow rate becomes extremely high, so the coating material becomes semi-molten and collides with the material at high speed, becoming solid. A thermal spray coating is formed.Then, the gun barrel 21 is coated with nitrogen.
The next cycle begins.

In the present invention, a metal material coated as described above is used for the tape guide, and when a mixed powder of Ap20360% and T0240% is used as the coating material, as shown in Fig. 4, at room temperature and normal humidity. It can be seen that the coefficient of friction is very small compared to stainless steel and ceramic materials, and it is also very stable.

The thickness of the coating 11 is, for example, about 10 μm.

Note that in the above examples, as the ratio of Aj220s increases, the hardness increases, but the electrical conductivity decreases. When the electrical conductivity decreases (insulation), the magnetic tape becomes charged due to sliding, which deteriorates the lubricity and causes noise generation.

Therefore, Af! , 20350-70%, TiO230
It is preferable to select a composition ratio of ~50%.

When a tape guide coated with Al2O3 is used as in the above embodiment, the tape runs smoothly due to the good lubricity of the coating 11 surface, and the induction of static electricity is prevented because the coating 11 surface is conductive. Therefore, there is no adhesion of the tape to the guide due to static electricity (1), and damage to the tape during tape sliding is prevented.

The reduction in the friction coefficient of the tape guide has a significant effect in reducing the tape tension, which makes it possible to reduce the driving torque during tape running and also to reduce the range of tension fluctuations. Moreover, since the tape guide surface (the surface that slides on the tape) is very hard, the amount of wear caused by sliding is also reduced. Furthermore, the corrosion resistance and heat resistance of the tape guide can be improved.

Note that the tape guide of the present invention cannot be used not only in VTRfs but also in various magnetic recording and reproducing apparatuses.

[Advantageous Effects of the Invention 1] As described above, according to the present invention, it is possible to provide a tape guide that enables very stable tape running with little influence from tape sliding.

This invention is particularly effective for smooth running of metal tapes.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a VTR, Fig. 2 is a sectional view showing an embodiment of the tape guide of the present invention, and Fig. 3 is an example of the plasma spraying method used for coating the tape guide of the present invention. The cross-sectional view shown in FIG. 4 is a graph showing changes in the coefficient of friction of tape guide pins made of various materials with respect to metal tape. 4.5...Tape guide pin, 10...Material, 11
···coating. Patent Applicant: Ricoh Co., Ltd. Agent: Patent Attorney Seohaku, 1 person, 1 person, Figure 1, Figure 3, Figure 4, Figure 1, Figure 3, Figure 4, ``Ystss Examination Post 4 Shrimp 2I)'' Ioi Ioitsu, Commissioner of the Patent Office, Tono 1 Display of Case 1982 Patent Application No. 117171 2. Name of the invention tape guide 3. Person making the amendment. Relationship with the case. Patent applicant 4. Agent 1. Explosion." Procedural amendment (voluntary) August 9, 1980 Patent application No. 117171 2. Name of the invention Tape guide 3. Person making the amendment Relationship to the case Patent applicant address 1-3 Nakamagome, Ota-ku, Tokyo No. 6 & Name (674
) Riko Co., Ltd. - Representative Hama 1) Date of amendment order for pressure 4 agent 5: Voluntary action 7 Contents of amendment (1) Changed the word "high conductivity" to "high conductivity" on page 3, line 13 of the specification.
Corrected as ``conductive.'' (2) On page 5, line 5, the phrase 110 μm was replaced with 50 μm.
250 μm”.

Claims (1)

[Claims] (1) A120350-70% on the surface of the metal material. 1. A tape guide for a magnetic recording/reproducing device, characterized in that it is coated with a mixed powder having a TiO2 ratio of 30 to 50% as a coating material.