JPH0366016A - Signal recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to video tape recorders (hereinafter referred to as VTRs) and digital audio tape recorders (hereinafter referred to as VTRs).
Hereinafter, it will be referred to as DAT. ), and relates to a rotary head type signal recording/reproducing device.

Conventional technology VTRs and DATs have recently been widely used in general households, and in the information field, they are used to take advantage of their large storage capacity for disk drive backup, data storage, image data storage, and conventional open-reel magnetic tapes. (
M-cho) is about to be replaced.

Problems to be Solved by the Invention However, in a rotating head type signal recording and reproducing device such as a VTR or DAT', a head provided on the circumference of a rotating drum records signals on a tape, or a signal is recorded on a tape. When reproducing a signal, the head or rotating drum often scrapes magnetic powder on the tape, causing the magnetic powder to adhere to the surface of the head. When this adhered magnetic powder becomes large near the head gap, a magnetic path is formed, making it impossible to record signals on the tape or reproduce signals recorded on the tape, causing a problem. . At this time, in the information processing field, which handles extremely valuable data, data will be irretrievably lost.

The present invention solves these conventional problems, and the technical problem is to remove the magnetic powder that has adhered to the head surface before it becomes enlarged. be.

Means for Solving the Problems In order to solve the above problems, the signal recording and reproducing device of the present invention includes: a head provided on the circumference of a rotating drum; a rotation direction control means for controlling the rotation direction of the rotating drum; When the rotary drum is being rotated by the rotation direction control means in the forward direction in which the rotary drum is rotated when recording/reproducing signals with the head, the rotary drum is moved away from the rotary drum, and the rotary drum is rotated in the forward direction. and a cleaning device provided at one end of the displacement means that comes into contact with the rotating drum when the displacement means approaches the rotating drum while it is rotating in the opposite direction. equipped with the means.

Effect: With the above-mentioned configuration, the rotation direction of the rotating drum, which rotates in a fixed direction, can be switched to the opposite direction when recording/reproducing magnetic powder etc. attached to the surface of the head provided on the circumference of the rotating drum. The cleaning means can be brought into contact with the head provided on the circumference of the rotating drum, and the cleaning means can remove magnetic powder and the like adhering to the surface of the head.

EXAMPLE A first example of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the rotating drum and its surroundings of the signal recording and reproducing device of the present invention, FIG. 2 is a side view of the rotary drum as viewed from the direction of arrow A, and FIG. 3 is a schematic diagram of the signal recording and reproducing device of the present embodiment. It is a micrograph.

In FIG. 3, signals are recorded/reproduced on a tape 4 by two heads 2.3 provided on the circumference of a rotating drum l.

Reference numeral 5 designates a capstan for feeding the tape 4. During recording/reproduction, the speed data (a) from the speed setting section 6 is given to the speed control section 7, and the speed control section 7 sends control parameters to the cylinder servo 8 and capstan servo 9. The rotating drum l is moved through the cylinder driver 10, and the capstan 5 is driven through the capstan driver 11.

Reference numeral 12 denotes a rotation direction setting section that gives a rotation direction command (b) to the cylinder driver air 0.

Here, the rotational direction setting section 12 and the cylinder driver 10 constitute rotational direction control means for controlling the rotational direction of the rotary drum l.

In FIGS. 1 and 2, a support shaft I is located near the rotating drum 1.
A rotary drum L is rotatably supported by B and this support shaft IB.
A pulley 14 that contacts the rotary drum l and transmits the rotation of the rotary drum l is provided, and a biasing member composed of a spring or the like is provided to obtain a transmission force that transmits the rotation of the rotary drum l by the pulley eye through a frixine l5. Means 16 provides an automatic force to pivot arm 17 .

Here, the support shaft 13, the pulley 14, the hook scene 15, the biasing means 16, and the rotating arm 17 constitute a displacement means.

The rotating arm 17 is rotatably installed around the support shaft 13, and a cleaning means 18 made of polyurethane foam, etc. is rotatably mounted on the shaft 18 provided at the tip of the rotating arm 17. It is provided.

When the displacement means approaches the rotary drum l, the cleaning means I8 comes into contact with the heads 2 and 3 provided on the circumference of the rotary drum l, and when the displacement means moves away from the rotary drum l, the cleaning means I8 is rotated to the stopper 20. The cleaning means 18 is separated within the range that the arm 17 touches.

The operation of the signal recording and reproducing apparatus configured as described above will be explained below.

The signal recording/reproducing device of this embodiment performs the following operations during recording or reproduction.
The capstan 5 is driven to feed the tape 4 in the direction of the arrow B, and the rotary drum 1 is rotated in the direction of the arrow C by the cylinder driver IO in response to a rotation direction command (b) from the rotation direction setting section 12.

At this time, the pulley 14 is rotating in the direction of arrow Ca,
The pivot arm 17 pivots via the hook scene 15 in the direction of the arrow cb until it hits the stop 20, so that the cleaning means 18 are separated from the head 2.3.

Furthermore, when the rotation direction setting unit I2 (Y) and rotation direction command (b) instructs reverse rotation, the single rotation drum l rotates in the direction of the arrow A, so the pulley 14 rotates in the direction of the arrow Da and rotates. The arm I7 rotates in the direction of arrow Db via the hook scene 15, and the cleaning means 18 moves to the heads F, Q, 3.
The magnetic powder adhering to the surface of the head 2.3 is removed.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view of the rotating drum and its surroundings of a signal recording/reproducing apparatus showing a second embodiment of the present invention. In the same figure, a brake means 21 is provided with a support shaft IB near the rotating drum 1 as a fulcrum, and one end thereof is a brake member 22 made of an elastic body, and a brake shoe 23 made of felt or the like is rotated thereon. A spring 24 is provided at the other end and serves as a biasing means for applying a braking force.

Further, a cleaning means 18 made of polyurethane foam or the like is rotatably provided on the tip of the brake member 22 on the shaft IB, and when the rotating drum 1 rotates in one direction, the brake hand string 21 bites into the cleaning means 18 (the brake means 21 is shifted to the right in the figure), and the brake member 2
2 is displaced in the direction of rotation of the rotary drum 1, the cleaning means 16 comes into contact with the head 2.3 provided on the circumference of the rotary drum 1, and when the rotary drum 1 rotates in the other direction, the brake means 2M escapes. (The brake means 21 is shifted leftward in the figure), and the brake member 22 is displaced in the rotational direction of the rotating drum, and the cleaning means 18 is moved toward the head 2.
．． It is configured to be further away from 3.

The operation of the signal recording/reproducing apparatus constructed as described above will be explained below.

First, the operation of the brake means 21 will be explained.
The dimension from the support shaft 13 to the spring 24 is Xl The dimension from the support shaft 13 to the play shoe 23 is Yl The dimension from the center of the support shaft 13 to the contact surface between the brake shoe 23 and the rotating drum 1 is given by the spring 24 The biasing force F
(not shown), the resistance force on the brake shoe 23 due to the breakage is P, and the braking force is μP (lYPI=I
XFl).

When the rotary drum 1 rotates in the direction of arrow C, the brake means 2N escapes, and the brake means 21 acts to the left in the figure, and a clockwise moment acts on the brake member 22, causing the brake member 22, which is an elastic body, to The cleaning means 18 is elastically deformed and moves away from the head 2.3 provided on the circumference of the rotating drum l.

When the rotary drum l rotates in the direction indicated by the arrow, the brake means 21 bites and a counterclockwise moment acts on the brake means 21 and 22, causing the brake member 22 to undergo elastic deformation and the cleaning means 18 to come into contact with the head 2.3. Magnetic powder attached to the surface of the head 2.3 can be removed.

A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a plan view of the rotating drum and its surroundings of a signal recording/reproducing apparatus showing a third embodiment of the present invention. In the figure, the same parts as in other embodiments are given the same reference numerals.

In this embodiment, the plunger 25 is simply driven in accordance with the rotation direction command (b) of the rotary drum 1 from the rotation direction setting unit 12 + , and when the rotary drum l is rotating in the D direction, that is, in the opposite direction. In this case, cleaning is performed by bringing a cleaning flora 2f into contact with the bed using a plunger 25.

Note that in both the eleventh and second embodiments and FIGS. 1 and 4, the cleaning means is installed assuming that the rotating drum rotates in the counterclockwise 8F direction during recording or reproduction, but the rotating drum rotates in the clockwise direction. It goes without saying that if the rotating drum rotates in the same direction, the same effect and result can be obtained by placing the cleaning means on the opposite side of the rotating drum.

Effects of the Invention As described above, according to the signal recording and reproducing apparatus of the present invention, even if magnetic powder from the tape adheres to the surface of the head during recording/reproducing, the cleaning material can remove the attached magnetic powder before it becomes enlarged. I can do it. Therefore recording the signal on tape/
Reproduction can be performed reliably, and especially in the field of information processing, there is an effect that valuable data will not be lost.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the surroundings of a rotating drum of a signal recording/reproducing device according to a first embodiment of the present invention, FIG. 2 is a side view of FIG. 1 viewed from arrow A, and FIG. 3 is a block diagram of the same. FIG. 4 is a plan view showing the area around the rotating drum of a signal recording/reproducing apparatus according to the second embodiment of the invention, and FIG. 5 is a plan view showing the area around the rotating drum of the signal recording/reproducing apparatus according to the third embodiment of the invention. FIG. l... Rotating drum, 2.3... Head, 6
... speed setting section, 7... speed control section,
8... Cylinder servo, 9... Capstan servo, lo... Cylinder driver v 11...
・Capstan driver, 12...rotation direction setting section,
1B... Urging means, 18... Cleaning means, 21... Brake means, 22... Brake member,
24...Spring, 27...Cleaning roller.

Claims (3)

[Claims] (1) A head provided on the circumference of a rotating drum, a rotation direction control means for controlling the rotation direction of the rotating drum, and a forward direction for rotating the rotating drum when recording/reproducing signals with the head. a displacement means that moves away from the rotating drum when the rotating drum is being rotated by the rotational direction control means and approaches the rotating drum when the rotating drum is rotating in a direction opposite to the forward direction; cleaning means provided at one end of the displacement means and abutting against the rotating drum when the displacement means approaches the rotating drum rotating in reverse; the cleaning means abutting against the rotating drum rotating in reverse; A signal recording/reproducing apparatus characterized in that the head is cleaned by cleaning the head. (2) The displacement means includes a support shaft disposed near the rotating drum, a pulley rotatably supported by the support shaft and in contact with the rotating drum to transmit rotation of the rotating drum, and a friction mechanism. 2. The signal recording and reproducing device according to claim 1, further comprising a rotating arm driven by said pulley. (3) The displacement means includes a support shaft disposed near the rotating drum, a brake shoe that is rotatably or slidably supported by the support shaft and comes into contact with the rotating drum, and a brake member that holds the brake shoe. The cleaning means is disposed on the brake member, and when the rotating drum rotates in one direction, the brake means bites and the brake member is displaced in the rotation direction of the rotating drum. When the cleaning means comes into contact with the head and the rotary drum rotates in the other direction, the brake means escapes and the brake member is displaced in the rotational direction of the rotary drum, causing the cleaning means to move away from the head. The signal recording and reproducing device according to claim 1, characterized in that: