JPS60258771A - Magnetic head driver - Google Patents

Abstract

PURPOSE:To attain ease and rational belt fitting by fitting an engaging member having a connecting hole or an engagement projection to both ends of a belt and fixing the belt to a head carriage in engaging with the engaging member. CONSTITUTION:The steel belt 8 is fixed to the head carriage 3 while forming an elastic member in a form of nearly L-shape, a couple of the engagement members 11, 12 fitted to both ends of the steel belt 8 are used, engaging holes 11a, 12a of the engaging members 11, 12 are fitted to the engaging projection 13 formed incorporatedly with end faces 3b, 3c of the head carriage 3 orthogonal to the side face 3a. Since the steel belt 8 is fixed to the head carriage 3 in a proper form, a tension spring 11b supplies always a proper tension to the steel belt 8, the turning of a pulley 6 is delivered accurately as the sliding distance of the head carriage 3, and highly accurate scanning of the magnetic head 2 is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a drive device for scanning a magnetic head in the radial direction of a rotating magnetic sheet for recording and reproducing information on the magnetic sheet.

<Prior Art> One of the magnetic recording and reproducing devices uses a magnetic sheet. This involves scanning a magnetic head in sliding contact with a magnetic sheet that rotates at high speed in the radial direction of the magnetic sheet, and recording image information, audio information, various numerical information, etc. on the magnetic sheet by forming annular or spiral tracks. , it is designed to be played in reverse.

In a recording/reproducing device using this magnetic sheet, 7 m
Since a large amount of information is recorded at high density, it is required to scan and position the magnetic head with respect to the magnetic sheet with higher precision than in conventional floppy disk drives.

Conventionally, there are various driving devices for determining the scanning position 1u of this magnetic head, one of which uses a belt. This consists of a head gear ridge on which the magnetic head is held, a guide lj (made of material) that supports the head carriage so as to be able to slide back and forth, a bobbin that is driven nine times by a drive source, and a bobbin that is wound around this pulley. It is equipped with a steel belt fixed to the helad carriage and stretched along the moving direction of the helad carriage. The head gear ridge is driven along the guide member by moving the head gear ridge along the guide member.In a drive device using such a belt, the attachment of the belt to the head gear ridge directly affects the scanning accuracy of the magnetic head. Therefore, the belt will not break unless it is attached with a predetermined tension and the direction of this tension is positive M parallel to the moving direction of the head gear ridge.

However, in the past, the belt was generally fixed to the head carriage with a screw through a presser member such as a washer, so when tightening the screw, the position of the presser member shifted and abnormal tension was applied to the belt. However, there was a risk that the belt would be twisted and deformed and the piece would stretch. Therefore, as a conventional countermeasure against the above problem, a bottle extending through the presser member is provided protruding from the head carriage to prevent the presser member from shifting, thereby preventing the belt from deforming or elongating. However, in order to prevent longevity, it is necessary to provide a bottle and a screw hole in the carriage, and high precision is required for the positional relationship between the bottle and the screw hole. This was not a reasonable countermeasure because it caused new problems that increased costs.

<Objective of the Invention> The present invention has been made in view of the conventional circumstances, and provides a magnetic head drive device in which a belt can be attached rationally and easily without increasing processing time or product cost. The purpose is to

<Configuration of the Invention> The configuration of the present invention that achieves the above object is such that a head gear ridge, in which a magnetic head is held, is supported by a guide member so as to be able to slide back and forth, and is wound around a boot that is rotationally driven by a drive source. In a magnetic head drive device in which a belt is fixed to the herad carriage and stretched over the head gear ridge along the moving direction of the head gear ridge, an engaging member having an engaging hole or an engaging protrusion is attached to the belt. The present invention is characterized in that the head carriage is provided with secured parts attached to both ends and engaged with the engaging member to fix the belt to the helad carriage.

<Effects of the Invention> According to the magnetic head drive device of the present invention, the engaging members having all the engaging holes or engaging protrusions are attached to both ends of the belt by welding or spot welding, respectively. Since the belt is fixed to the head gear ridge by engaging the engaging member with the engaged portion formed on the carriage,
To fix a belt to a head carriage without applying abnormal tension to the belt, without causing deformation or one-sided elongation, and to facilitate belt fixing work by using conventional screw tightening. 2. Machining the engagement protrusions and engagement holes on the head carriage is easier and cheaper than machining screw holes, and it is also easier to process than the conventional method of fixing the heald by simply tightening screws. The effort and product cost can be reduced.

<Embodiment> Hereinafter, one embodiment of a magnetic head drive device according to the present invention will be described based on the drawings.

FIG. 1 is an overall perspective view of the magnetic head drive device of this embodiment;
FIG. 2 is a sectional view taken along arrows 1--2 in FIG. 1, and FIG. 3 is a U perspective view of the belt drive section.

Two guide shafts 1 fixed parallel to each other to a frame (not shown) of a magnetic recording/reproducing device extend parallel to a direction perpendicular to the rotation axis of a magnetic sheet (not shown) rotating at high speed. A helad carriage 3 holding a magnetic head 2 that is in sliding contact with a magnetic sheet is supported by the magnetic head 1 so as to be able to freely reciprocate. Therefore, as the head gear ridge 3 moves, the magnetic head 2 scans the magnetic sheet in the radial direction,
Various kinds of information can be recorded on this magnetic sort, and conversely, it can be reproduced.

A wide large groove portion 4 and a narrow small groove portion 5 are formed adjacent to each other on a side surface 3a of the head carriage 3 parallel to the guide shaft 1, and a wide groove portion 4 and a narrow small groove portion 5 are formed adjacent to each other on the side surface 3a. A pulley 6 having a rotation axis perpendicular to the guide shaft 1 as shown in FIG.
The pulley 6 is connected to a drive source (not shown) and driven to rotate. A steel belt 8, which is bifurcated at the center, is wrapped around the pulley 6.

The steel belt 8 is fixed by a screw 10 via a presser member 9, and extends parallel to the direction of movement of the head carriage 3 while being stretched across the large groove 4 and the small groove 5. It is fixed to the Kaherad carriage 3.

The steel belt 8 is fixed to the head carriage 3 by a pair of elastic plates formed into an oval shape and welded to both ends of the steel belt 8 in advance, or by spot welding or the like. The engagement holes 11a of the engagement members 11.12 are inserted into the engagement protrusions 13 integrally formed on the end surfaces 3b and 3c of the head carriage 3 in the forward and backward movement direction perpendicular to the side surface 3a, respectively. 12a
This is done by fitting the Therefore, end face 3
b, push the engagement members 11, 12 across the engagement members 11, 3c, elastically deform the engagement members and ride on the engagement protrusion 13, and fit the engagement holes 11a, 12a into the engagement protrusion 13. With this extremely easy process, steel belt 8
can be fixed to the head carriage 3, and
This work does not require the laborious and costly process of drilling screw holes or using screws, and the abnormal tension caused by tightening the screws may deform the steel belt or cause it to stretch on one side. do not have.

Incidentally, by engaging the L-shaped engaging members 11° 12 with the square rod of the head carriage 30 consisting of the side surface 3a and the end faces 3b and 3c, displacement of these engaging members 11° and 12 is prevented. Although the proper attachment state of the steel belt 8 is guaranteed, it is preferable that the engagement protrusion 13 and the engagement holes 11a, 12a are also formed so as to be aligned without any gaps.

A tension spring portion 11b that presses the steel belt 8 against the small groove portion 5 to apply a predetermined tension to the steel belt 8 is integrally molded on the engagement member 11 on the small groove portion 5 side.
When the steel belt 8 moves due to the rotation of the pulley 6 and the carriage 3 slides, it is ensured that the steel belt 8 is not bent and the scanning accuracy of the magnetic head 2 is not deteriorated. In addition to the mechanism described above, the mechanism for applying tension to the steel belt 8 is, for example, as shown in FIG. It is also possible to use a roller 18 attached to a coil spring 17 to press the steel belt 8 into the small groove.

According to the magnetic head drive device configured as described above, since the steel belt 8 is fixed to the head gear ridge 3 in an appropriate state without deformation or one-sided stretching, the tension spring portion 1
Appropriate tension is always applied to the steel belt 8 by the steel belt 1b. Therefore, the rotation of the pulley 6 is accurately transmitted as the sliding distance of the head carriage 3 through the steel belt 8, and the magnetic head 2 is scanned with high precision.

FIG. 4 is a perspective view showing a part of the engaging member and head carriage of another embodiment of the present invention. The engagement member 20 of this embodiment is bent into a groove shape so as to sandwich the helad carriage 3 from its upper and lower surfaces, and the engagement member 20 has projecting portions on the upper and lower surfaces of the helad carriage 3, respectively. An engagement hole 20a that fits into the engagement protrusion 21.21.

20a are formed respectively. Therefore, similarly to the above-mentioned embodiments, the steel belt 8 can be easily fixed to the head carriage 3 by the engagement member 20 without causing deformation or one-sided elongation. Although the engagement hole is formed in the head carriage and the engagement protrusion is formed in the head carriage, it is also possible to reverse these relationships and form the engagement protrusion in the engagement member and the engagement hole in the head carriage. It has the same effect as. Further, in each of the embodiments, the engaging protrusion has a rectangular wedge shape, but it may have another shape such as a cylindrical shape, and its protruding position can also be set, for example, on the side surface 3a. Furthermore, the present invention is not limited to belts made of steel, and even when applied to drive devices using belts made of other materials, the same effects as described above can be achieved.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a magnetic head drive device according to an embodiment of the present invention, and FIG.
- ■ Cross-sectional view in the direction of arrows, Figure 3 is a perspective view of the belt drive unit,
FIG. 4 is a perspective view showing a part of the engaging member and head gear ridge of another embodiment, and FIG. 5 is a perspective view showing another aspect of the mechanism for applying tension to the belt. In the drawing, 1 is a guide shaft, 2 is a magnetic head, 3 is a helad carriage, 6 is a pulley, 8 is a steel belt, 11, 12, 20 is an engagement member, 11a, 12a, 20a are engagement holes, 13 .21fi engagement protrusion. Patent applicant: -shi Photo Film Co., Ltd. (and others) Agent: Patent attorney: Shibu Motoishi (and one other person) Figure 1-2 Figure 2 Figure 4 Figure 1 2υ Figure 5

Claims (1)

[Claims] A herad carriage holding a magnetic head is supported by a guide member so as to be able to slide back and forth, and a belt that is integrally and drivably wound around a boob which is rotationally driven by a drive source is used to move the herad carriage. In the magnetic head W stretched and fixed on the head gear ridge in a different direction, in the moving device, an engaging member having an engaging hole or an engaging protrusion is attached to both ends of the belt, and the engaging member is engaged with the engaging member. 1. A magnetic head drive device characterized in that the head carriage is provided with an engaging portion for fixing the belt to the head gear ridge.