JPS62298062A - Magnetic head carriage driving mechanism - Google Patents

Abstract

PURPOSE:To easily and exactly execute the position adjusting work of a magnetic head by rotating a gear box to which a pulley, a stepping motor, and a reduction gear train are attached, by the center shaft of the pulley supported pivotally to the hole of a device main body. CONSTITUTION:A carriage 2 to which a magnetic head 1 is attached is moved straightly by a steel belt 4 and a pulley 5. The pulley 5, the stepping motor 6, and the reduction gear train 7 interposed and provided between them are all attached to a gear box 8. The centering shaft 9 of the pulley 5 is supported pivotally to the hole 131 provided on a device body 13, so that the gear box 8 can rotate centering around the shaft 9. At the time of adjusting the position of the magnetic head 1, the pulley 5 is fixed by exciting the motor 6, and the carriage 2 is moved by rotating the gear box 8 centering around the shaft 9. Thereafter, the gear box 8 is fixed to the body 13 side with a fixing screw 10, and the position adjustment of the magnetic head 1 is completed.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to floppy disks, video floppy devices, etc. that use a magnetic sheet and move the magnetic nodule in a straight line to record and reproduce information. The present invention relates to a magnetic head carriage drive mechanism (hereinafter referred to as a carriage drive mechanism).

<Prior art> As shown in FIGS. 3(a) and 3(b), a carriage 2' is driven by a steel belt 4 as a carriage drive mechanism according to the prior art.
Here is an example of what is driven by .

A pulley 5' is attached to the stepping motor 6', and a steel belt 4' is wound around the pulley 5', both ends of which are fixed to the carriage 2'. That is, the carriage 2' is directly connected to the stepping motor 6'.
' rotates a certain amount, and steel belt 4 is attached to pulley 5'.
The structure is such that the carriage 2' is fed by a certain amount by winding up the carriage 2'.

By the way, when assembling the device, the position of the magnetic head is adjusted in order to match the stopping position of the head to the standards of video floppies and the like. This adjustment is performed by keeping the stepping motor 6' energized (fixed), rotating the stepping motor 6' so that the magnetic head 1' comes to a predetermined initial position, that is, the first track, and fixing it at that position. This is done by

<Problems to be Solved by the Invention> In recent years, in order to cope with the increase in the density of magnetic recording, there has been an increasing need to obtain a finer feed of the magnetic head. It is also necessary to make the feed amount of the carriage 2' more precise.

Here, a case will be described in which adjustment work is performed using the conventional magnetic head carriage drive mechanism shown in FIG.

In FIG. 3, the feed amount of the stepping motor 6' is expressed by the following equation.

N=(d+t)Xθ/360 where d is the diameter of boot no 5', t is steel belt 4
' is the thickness, and θ is the rotation angle (DEG, ) of the stepping motor 6' by one energization.

Therefore, in order to reduce the feed amount l, it is necessary to reduce θ and d. In order to reduce θ, conventionally expensive hybrid stepping motors with small θ have been used (for example, stepping motors that have the characteristics of reluctance stepping motors and permanent magnet stepping motors, with rotors made of electromagnetic materials). It consists of a tooth-shaped magnet and a magnet with magnetic poles in the thrust direction, and the rotor is rotated by the rotation of the magnetic poles of the stator. On the other hand, regarding reducing the diameter d of the pulley 5', since the total amount of movement of the carriage 2' is proportional to the diameter d of the pulley 5', it is necessary to reduce d in order to secure the necessary amount of movement. Naturally, there are limits.

Therefore, as long as the conventional structure is adopted, (1) the rotation of the stepping motor 6' is intermittent, and (2) in the conventional magnetic head carriage drive mechanism, the stepping motor 6' is directly connected to the carriage 2'. Therefore, in the position adjustment work, it is quite difficult to accurately move the magnetic head to a predetermined position.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic head carriage drive mechanism that can easily and accurately adjust the position of a carriage and a magnetic head.

Means for Solving the Problems> In order to solve the above problems, the entire drive section including the steering wheel, the ping motor, and the reduction gear train employed as the reduction mechanism is made into one independent component (hereinafter referred to as the gear box). The gearbox is configured to be able to rotate around the central axis by extending the central axis of the final pinion or boob when viewed from the stepping motor toward the device main body and supporting it in a hole drilled in the device main body. ing.

Function> When installing a gearbox, the central shaft of an extended pinion or pulley is sometimes supported in a hole provided in the main body of the device to serve as the center of rotation of the gearbox. To move the head to a predetermined position, the entire gearbox is rotated about the central axis while the stepping motor is energized.

<Embodiment> FIG. 1 shows an embodiment of the present invention using a steel belt and a pulley. The carriage 2 is formed in an abbreviated shape consisting of a support shaft part 21 and an arm part 22, and the magnetic head 1 is fixed on the arm part 22, and is moved in the direction of the arrow by two guide shafts 3. It is possible to slide.

A protrusion 211 is provided on the side surface of the support shaft 21 of the carriage 2, and a steel belt 4 is attached to the protrusion 211.
is attached and driven by the pulley 5 as in the conventional case. Furthermore, a reduction gear train 7 consisting of gears 71, 72, 73, and 74 is interposed between the stepping motor 6 and the pulley 5, and each rotating shaft of this reduction gear train 7 is supported by one gear box 8. ing. Central axis 9 of pulley 5
is extended to the device main body 13, and is rotatably supported in a hole 131 provided in the device main body 13. Further, the stepping motor 6 is fixed to the gear box 8 with screws 61.

In adjusting the position of the magnetic head 1, in order to move it, the stepping motor 6 is energized to fix the boolean I75, and in this state, the gear box 8 is rotated about the central shaft 9 to move the carriage 2. let That is, if the gear box 8 is rotated in the direction of the arrow A around the central axis 9, the carriage 2 will slide in the direction of the arrow, and if the gear box 8 is similarly rotated in the direction of the arrow B,
The carriage 2 slides in the - direction. After that, fixing screws 10 and 10 fitted diagonally on the gear box 8
Then, the gear box 8 is fixed to the apparatus main body 13 side, and the position adjustment of the magnetic head 1 is completed.

FIG. 2 shows another embodiment of the present invention in which the carriage 2 is driven by a rack 11 and a pinion 12.

The explanation for FIG. 1 is applicable except that the pulley 5 and steel belt 4 in FIG. 1 are replaced by the pinion 12 and rack 11 in FIG. 2, respectively.

<Effects of the Invention> As explained above, in the magnetic head carriage drive mechanism according to the present invention, the reduction gear train and the motor are combined into one gear box as the carriage drive mechanism, and the center of the pulley that drives the steel belt is The central axis of the pinion that drives the shaft or rack is extended toward the main body of the R unit, and is rotatably supported in a hole provided in the main body of the device, so it is moved to a predetermined position when adjusting the position tJ1 of the magnetic head. In this case, it is only necessary to rotate the gear box a small amount around the central axis, so the position adjustment work of the magnetic head can be performed easily and accurately, and a high-precision stepping motor is not required, reducing the cost of the entire device. can be achieved.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a carriage drive mechanism according to the present invention in which a steel belt and a booby are used as means for moving the carrier, and FIG. b) The carriage part is a front view, and the reduction gear train part is a developed front view in which each axis is connected. Fig. 2 shows another embodiment of the present invention in which a rack and a pinion are used as means for moving the carriage. The part shows a front view, and the part of the reduction gear train shows an expanded front view with each shaft center connected. Figure 3 shows a conventional carriage drive mechanism when a steel belt and a booby are used as means for moving the carriage. , FIG. 3(a) is a plan view thereof, and FIG. 3(b) is a perspective view showing the relationship between the stepping motor and the steel belt. 1...magnetic head, 2...carriage, 3.
...Guide shaft, 4 ...Steel belt, 5 ...
Pulley, 6...Stepping motor, 7...Reduction gear train, 8...Gear box, 9...Center shaft, 10...Fixing screw, 11...Rack, 12...
Binion, 13... device main body.

Claims (1)

[Claims] (1) A magnetic head carriage drive mechanism in which a carriage on which a magnetic head is attached moves linearly by a steel belt and a pulley or a rack and a pinion, the shaft being interposed between the shaft of the pulley or pinion, a stepping motor, and the shaft and stepping motor. Both reduction gear trains are attached to one gear box, and the center axis of the pulley or the pinion is extended toward the device main body and is pivotally supported in a hole provided in the device main body. A magnetic head carriage drive mechanism characterized in that the gear box can be rotated about the central axis when the gear box is attached to the main body of the apparatus.