JPS592263A - Head feeding device of magnetic disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To have quick program searching, by shifting a magnetic head only in a ragne of a recorded track in a reproduction mode to prevent the shift of a magnetic head to the unrecorded track part and jsut by shifting the magnetic head only toward the inner circumference of a magnetic disk even in case a recording track is consecutively recorded. CONSTITUTION:A clutch is pushed down in an initial state, and terminals C and D are not conductive. At the same time, a detector 14 for utmost outer circumference track has a contact with a pawl 11c of a clutch 11 to make terminals A and B conduct. Thus it is impossible to shift a magnetic head 8 toward the outer circumference. Then the clutch 15 is pushed up to fit a counter 2 at an instant when a projected part 15a is coincident with a depressed part 2a after a motor 4 is turned consecutively. At the same time, the terminals C and D conduct to stop the motor 4, and the head 8 is fed up to the final recording track of a magnetic sheet 1a. When the reproduction is carried out in the initial state, the head 8 is not shifted toward the outer circumference of a disk but shifted toward the inner circumferenc since the terminals A and B conduct. Then the head 8 is stopped when the terminals C and D conduct and never shifted toward more inner circumference than the position of the corresponding track.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head feeding device for a magnetic disk recording/reproducing machine, and in particular, the present invention relates to a head feeding device for a magnetic disk recording/reproducing machine. This simplifies the cueing operation when doing so.

In conventional magnetic recording and reproducing devices that use a magnetic head to record and reproduce information on a disc-shaped magnetic sheet, there is no particular restriction on the movement range of the magnetic head, and the magnetic head can move freely in the radial direction of the magnetic sheet. The head is configured to be movable.

In such a head feeding device, even when reproducing a magnetic sheet on which signals have already been recorded from the outermost circumference to a trunk in the middle, the magnetic head is stopped at a position of an unrecorded track on the inner circumference side of the recorded track. Sometimes. Next, from this state, in order to newly record a signal on the unrecorded track following the recorded track, the magnetic head must be returned to the unrecorded track position as a cueing operation. Furthermore, during playback, when the magnetic head is stopped on the outer circumferential side of the recorded track, the head must be moved to the next unrecorded track position to perform a cueing operation.

In this way, in conventional magnetic disk recording and reproducing machines, it is necessary to determine whether to send the magnetic head to the outer periphery or to the inner periphery, depending on the last stop position during playback. The disadvantage is that it is extremely complex.

Also, during playback, the magnetic head may be moved to an unrecorded track, resulting in extremely inefficient head movement.
It constitutes the configuration of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head feeding device that can move the head efficiently during playback and easily and quickly locate the beginning during recording, while eliminating the drawbacks of the prior art described above. There is a particular thing.

In order to achieve this object, the present invention utilizes a counter mechanism provided in a sheet case, and uses a counter drive section that drives the counter mechanism, and a counter drive section that controls the outermost recording track position of the magnetic sheet and the final recording track position. A detection means for detecting the recording trunk position is provided so that the magnetic head can only move within the range of tracks recorded on the magnetic sheet during reproduction.

(5) Examples of the invention and its effects Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a sheet bank used in this magnetic disk recording/reproducing apparatus. This seat pack 1 includes
Rotatable ring-shaped counter 2 provided with a recess 2a
It is possible to specify the track number for recording signals on the magnetic disk.

FIG. 2 is a diagram showing a head feeding device and a counter driving device for driving the counter 2 of the present magnetic disk recording/reproducing apparatus. First, the present head feeding device will be explained. 4 is a head feed motor, 6 is a feed screw, 7 is a head carriage, 8 is a magnetic head for recording and reproduction, 1B is a magnetic sheet delivered to the sheet pack 1, and the head feed motor 4 rotates. By the feed screw 6. Through the head carry shift, the magnetic head 8 carries the magnetic seat) 1a
During recording, the zero-head feeding device that moves in the radial direction sends the magnetic head 8 from the outermost recording track of the magnetic sheet 1a one track at a time toward the inner circumference, thereby recording signals on the recording tracks. be. Also seat pack 1
When the magnetic head 8 is removed from the apparatus, the magnetic head 8 is returned to the outermost recording track. Therefore, when the sheet pack 1 is not installed or in the initial state when it is installed, the magnetic head 8 is always at the outermost track position.Next, we will explain about the counter drive device. The rotation of the head feed motor 4 is transmitted to the worm gear 1D via a fixedly attached drive gear 5 and a driven gear 9. 11 is the first clutch.

12 is a shaft, 16 is a reset spring, 15 is a second clutch, 16 is a ring for preventing removal, and shaft 1
2 includes a first clutch 11. Reset piece spring 13. The second clutch 15 is rotatable in order;

The second clutch 15 inserted so that the shaft 12 is always pushed upward by the restoring force of the reset spring 16,
It is attached so that it cannot fall out. first clutch 1
1, a counter gear 11a is integrally formed on the same axis, and meshes with the worm gear 10 to feed the magnetic head 8 from the outer circumference to the inner circumference of the magnetic sheath 11a. The clutch 11 is configured to rotate counterclockwise. This first clutch 1j is provided with a first pawl 11c, and a second pawl 15c of a similarly provided second clutch 15 is pushed to rotate the second clutch 15 counterclockwise. . This second clutch 15 is provided with a convex portion 15a, which engages with the concave portion 2a of the counter 2 to rotationally drive the counter 2 in a counterclockwise direction.

Both ends of the reset spring 13 are inserted into a small hole 11b provided in the first clutch 11 and a small hole 15e provided in the second clutch 15. Even if the pack 1 is attached, if the convex portion 15a of the second clutch 15 and the concave portion 2a of the counter 2 do not fit together, the second clutch 1
5 clockwise, and the second pawl 15. of the second clutch 15 is connected to the first pawl 11c of the first clutch 11. The second clutch 15 is stopped while b is in contact.

Further, when the positions of the convex part 15a and the concave part 2a do not match, the convex part 15a is pushed down by the lower surface of the ring of the counter 2.Next, the present invention will be described in detail.

Reference numeral 14 designates an outermost track position detector having electrodes 14a and 14b, and both sides of the first pawl 11c, which is fixedly attached to a housing (not shown), are made of a conductive material. When the first clutch 11 rotates clockwise and the side surface of the first pawl IIC contacts the detector 14, the electrodes 14a and 14b become conductive, and a current flows between the terminal A and the terminal 8. There are electrodes 15c and 15d on one side of the second pawl 15b of the second clutch 15, and the electrode 15c
, 15d are connected to the upper surface electrodes 15c', 15d'-. Reference numerals 17a and 17b are ring-shaped electrodes, which are attached to the lower surface of a stabilizing plate (not shown) on which the seat pack 1 is attached. The second clutch 15 has a convex portion 15a
When the concave portion 2a of the counter 2 does not match, the counter 2 is pushed down, so that the electrodes 15c' and 15d' on the upper surface do not contact the ring-shaped electrodes 17a and 17b. Next, when the convex portion 15a of the second clutch 15 and the concave portion 2a of the counter 2 match, the restoring force of the spring 15 causes the second clutch 15 to move to the position of the retaining ring 16. The electrodes 15c' and 15d' on the upper surface come into contact with the ring-shaped electrodes 17a and 17b. When the first clutch 11 further rotates counterclockwise and the first pawl 11c and the second pawl 15b made of a conductive material come into contact, the electrodes 15c and 15d become conductive, and the electrode 15
c'.

Terminal C and the terminal are energized via 15d', 17a, and 17b.

FIG. 6 is a block diagram of a device for controlling the present head driving device by the counter driving device described above, in which 8 is a magnetic head, 4 is a head feeding motor, 18 is a motor control circuit, and 19 is a DC power source 20. .21 is resistance, A, B, C,
D is a terminal of the electrode. In this motor control circuit 18, X is an outer circumferential head feed stop input terminal, Y is an inner circumferential head feed stop input terminal υ, input terminals X, Y
It is assumed that by applying the voltage of the DC power supply 19 to the head feed motor 4, motor stop information is sent to the head feed motor 4, and the head feed motor 4 is stopped. Therefore, when the terminals A and 3 are electrically connected, the feeding of the magnetic head 8 in the outer circumferential direction can be stopped, and when the terminals C and 0 are electrically conductive, the feeding in the inner circumferential direction can be stopped.

Next, a description will be given of the head feeding operation during recording and reproduction when the sheet pack 1 on which signals have already been recorded on one or more tracks is mounted. In the initial state when this sheet pack 1 is installed, the magnetic head 8 is at the outermost recording track position, and the positions of the convex portion 15a of the second clutch 15 and the concave portion 2a of the counter 2 do not match. clutch 1
5 is pressed down, and terminals C and D are disconnected. Further, since the outermost drag detector 14 and the first pawl 11c of the first clutch 11 are in contact with each other, the terminals A and B are electrically connected, and the magnetic head 8 cannot be moved in the outer circumferential direction. A case in which recording is continued from this initial state to a track that has been partially recorded will be explained. Continuously rotate the head feed motor 4,
The magnetic head 8 is continuously fast-forwarded from the outermost track position toward the inner circumference. At the same time, the first clutch 11 rotates counterclockwise, and simultaneously drives the second clutch 15 counterclockwise. The moment the second clutch 15 rotates counterclockwise and the convex portion 15a matches the concave portion 2a of the counter 2, the second clutch 15 is pushed up and engages with the counter 2, and at the same time, upper surface electrode 15c',
Since the ring-shaped electrodes 17a and 17b are in contact with each other, the terminals C and D are electrically connected. Therefore, the rotation of the head feeding motor 4 is stopped, and the feeding of the magnetic head 8 in the inner circumferential direction is also stopped. Through the above operations, the magnetic head 8
This means that the magnetic sheet has been sent to the final recording track position of 1a.

Next, the case of reproducing from the initial state will be explained. During reproduction, it is necessary to freely send the magnetic head 8 track by track or continuously in the outer and inner circumferential directions.

First, in the initial state, since the terminals A and B are electrically connected, the magnetic head 8 cannot be moved in the outer circumferential direction.

Next, when the magnetic head 8 is sent in the inner circumferential direction and the convex portion 15a of the second clutch 15 and the concave portion 2a of the counter 2 match, conduction occurs between the terminals C and 0, and the magnetic head 8 will stop, and the feed will not stop from this track position to the inner circumference. By the above operation, during reproduction, the magnetic head 8 can be freely moved within the range of the outermost recording track and the final recording track.

As explained above, according to the present invention, during reproduction, the magnetic head can only move within the range of recorded tracks, so the magnetic head does not move to unrecorded tracks, thereby eliminating wasteful reproduction operations. do not. Further, even when continuously recording on the previous recording track after reproduction, it is only necessary to move the magnetic head in the inner circumferential direction, so the cue can be easily and quickly performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the sheet pack, FIG. 2 is a perspective view of the head feed device and counter drive mechanism, and FIG. 3 is a block diagram of the head feed control device. 1... Sheet pack 2... Counter 1a... Magnetic sheet 11... First clutch 15... Second clutch 8... Patent attorney representing magnetic head Usui 1) Tori ・7 trenches ) - Na・, Sugar 1 Figure 3

Claims (1)

[Claims] For driving the counter mechanism in a magnetic recording/reproducing device that sequentially sends a magnetic head in the radial direction of a disc-shaped magnetic sheet housed in a sheet case equipped with a counter mechanism to record and reproduce information. By providing a counter driving section, a detection means for detecting the outermost recording track position of the magnetic sheet, and a detection means for detecting the indicated value of the counter, the magnetic head can be detected only within the tracks recorded on the magnetic sheet. A head feeding device for a magnetic disk recording/reproducing machine, characterized in that the head is movable.