JPH0418385B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is for making a magnetic tape come into contact with a magnetic head with a certain tension and run evenly and with high precision in a magnetic recording/reproducing device such as a video tape recorder or a tape recorder. The present invention relates to a method of manufacturing a magnetic tape running guide component.

Conventional structure and its problems Figure 1 shows an example of a tilted guide post for magnetic tape running used in a normal video tape recorder.The holder 1 is made of aluminum die-cast material and is made of stainless steel with a highly precisely processed surface. A shaft 2 of wood is combined.

With such a combination of materials, it is difficult to solder and bond, so a mechanical press-fit caulking method is used. That is, as shown in FIG. 2, the diameter of the hole 3 of the holder 1 is machined to be smaller than or equal to the outer diameter of the shaft 2, and the shaft 2 is forcibly inserted into the hole 3 of the holder 1.

At this time, the bonding strength differs depending on the dimensional difference between the two parts, so in order to produce the bonding strength without variation, the dimensional tolerance of both parts becomes extremely tight, causing high prices.

Further, in this inclined post, the angle between the holder bottom surface 4 and the shaft 2 needs to be highly accurate. Therefore, in order to ensure this accuracy, it is first necessary to set the angle θ of the aluminum die-cast holder 1 with high precision, and usually a cutting process such as reaming is added to the die-cast product. This causes further cost increase. Moreover, even if this holder 1 is machined with high precision, errors are accumulated due to deformation etc. when press-fitting the shaft 2, and the yield is low, making it extremely difficult to assemble and join with high precision and at a low cost. .

Purpose of the Invention The present invention has been made in order to solve the problems of the conventional art as described above. To provide a method for manufacturing a magnetic tape running guide component, which allows extremely easy positioning and fixing with high precision when assembling and joining the guide components, and joins them with high strength in a short time without contact.

Structure of the Invention In order to achieve this object, the present invention makes the dimensions of the hole of the holder larger than the diameter of the insertion shaft to provide a gap, and temporarily fixes the hole with an assembly jig to ensure positioning accuracy such as angle. This is a method for manufacturing a magnetic tape running guide component in which the holder surface or the adhesive brazing material is irradiated with high-density laser light in this state.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.
FIG. 3 shows a holder 1 made of a low melting point material such as aluminum die-casting, showing the first embodiment of the present invention.
A shaft 2 made of a high melting point material such as stainless steel and having an outer diameter smaller than the hole diameter is inserted into the hole. At this time, there is a gap 8 between the shaft 2 and the hole of the holder 1. Both parts 1 and 2 are then temporarily fixed using a high-precision positioning jig 9. Therefore, the required accuracy after joining can be ensured with good reproducibility using this jig 9. In other words, the holder fixing jig reference plane 5 and the shaft regulating V reference plane 6 are created at predetermined angles, and both the holder 1 and the shaft 2 are temporarily fixed with the necessary shape accuracy by means of springs, screw tightening, etc. be done. In this state, when the laser beam 7 is irradiated on one or more places from the outer surface of the holder 1, both parts are completely joined. In other words, when a carbon dioxide laser beam with a power density of about 1 to 6 KW/ ^mm2 is irradiated for about 0.1 to 1 second, the low melting point material on the outside melts and evaporates, the surrounding area softens, and then the high melting point material melts and bulges. However, it is firmly joined by a combination of mechanical caulking and the fusion of both materials. At this time, since only laser light is irradiated, processing and joining can be performed without contact, and the work can be performed in a very short time and is efficient.

FIG. 4 shows a second embodiment of the invention.
In this case, another material 1, such as a brazing material, is used to act as an adhesive on the part where the holder 1 and the shaft 2 are joined.
0 is placed in the middle, and this portion is melted with high-density energy light such as a laser beam.

At this time, the adhesive brazing material 10 may be wound around the shaft 2 in the form of a ring-shaped plate, as shown in FIG. 4b, or may be applied around the shaft 2 in the form of a paste.

In addition, the brazing material 10 may be partially exposed at the root of the joint between the shaft 2 and the holder 1, as shown in FIG. 1 may be exposed, and the exposed portion of the brazing material 10 may be irradiated with an energy beam such as a laser beam or a light beam. In this case, the power density of the irradiated energy beam is lower than that in the case of FIG. 3, and sufficient bonding is possible.

Effects of the Invention As described above, the present invention involves inserting a shaft with an outer diameter smaller than the hole diameter into a hole in a shaft holder, positioning both using a high-precision positioning jig, temporarily fixing them, and then removing the shaft from the outside of the holder or from the holder. This is a manufacturing method for magnetic tape running guide parts in which the brazing material inserted between the shaft and the shaft is irradiated with an energy beam and fixed.As the assembly positioning accuracy is ensured by a positioning jig, the individual accuracy of the shaft and holder can be improved. can be relatively low, can be manufactured at low cost, and has excellent mass productivity. Also,
The joining process can also be performed in a short time without contact.
The process is also greatly simplified.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a conventional inclined post for a video tape recorder, FIG. 2 is an exploded view of each component in FIG. 1, and FIG. 3 is an implementation of the method for manufacturing a magnetic tape running guide component according to the present invention. A perspective view for explaining an example, FIGS. 4a and 4b are perspective views for explaining another embodiment of the manufacturing method according to the present invention. 1... Holder, 2... Shaft, 5... Holder fixing jig reference surface, 6... Shaft regulation V reference surface, 7
... Laser beam, 8... Gap, 9... Positioning assembly jig, 10... Brazing material.

Claims (1)

[Claims] 1. Insert a shaft with an outer diameter smaller than the hole diameter into a hole in a shaft holder, fix the shaft holder to a reference surface of a positioning jig, and fix the shaft to a shaft reference surface of the positioning jig. A method for manufacturing a magnetic tape running guide component, which comprises temporarily fixing the two together, and irradiating the outside of the shaft holder or the surface of the brazing material provided between the shaft holder and the shaft with an energy beam. 2. The method of manufacturing a magnetic tape running guide component according to claim 1, wherein the shaft holder is made of a low melting point material and the shaft is made of a high melting point material.