JPH06309633A - Rotary head device - Google Patents

Abstract

PURPOSE:To improve the workability for cleaning a rotary head. CONSTITUTION:When a cleaning mode is selected by a mode selector 21, a drum speed instruction signal SSI according to the rotational speed of a dial 11 is outputted from a controller 22 to be supplied to a reference speed generator 31. By the generator 31, a reference speed signal VREF according to the instruction signal SSI is generated to be supplied to a subtracter 32. An FG pulse PFGD from a frequency generator attached to a drum motor 34 is supplied to a speed detector 35, and a speed signal VDS corresponding to the rotational speed of the motor 34 is formed to be supplied to the subtracter 32. A difference signal from the subtracter 32 is supplied to a drive amplifier 33 to drive a motor 34, and the rotational speed of the motor 34 is feedback-controlled so as to be equalized with the speed instructed by the instruction signal SSI. The dial 11 is rotated and the drum motor 34, then, the rotary head is rotated at an optional speed at a cleaning time, and it becomes unnecessary to rotate it manually as usually done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head device such as a propeller type or a medium drum type.

[0002]

2. Description of the Related Art FIG. 2 shows a state of head cleaning of a propeller type rotary head device. In the figure, 1 is a fixed lower drum, 2 is a fixed upper drum, and 3 is a rotary head. The hatched portion shows the tape running surface.

Further, in this rotary head device, a slip ring is used as a signal passing means in addition to the rotary transformer, and 4 is a slip ring portion. For example, a rotary transformer transfers a recording signal and a reproduction signal, and a slip ring transfers a dynamic tracking drive signal and a power supply.

When cleaning the rotary head 3, the drum cover covering the upper surface side of the upper drum 2 is removed (the state shown in the drawing is the state in which the drum cover is removed), and the holder portion 5 of the slip ring is shown as shown in the figure. Is slowly rotated in the direction of the arrow with one hand, whereby the rotary head 3 is rotated in the direction of the arrow, and the cleaning piece 6 soaked with the cleaning liquid is gently pressed against the rotary head 3 with the other hand.

[0005]

When cleaning the rotary head 3 as described above, it is necessary to remove the drum cover. Further, since the exposed portion of the holder portion 5 is small, it is not easy to rotate it with a finger, and moreover, it can be rotated only 1/4 to 1/3 rotations at a time. Therefore, the workability was very poor.

Therefore, an object of the present invention is to improve the workability of cleaning the rotary head.

[0007]

SUMMARY OF THE INVENTION A rotary head device according to the present invention includes a mode selecting means for selecting a cleaning mode, a rotation command means for instructing a rotary speed of the rotary head, and a rotary speed of the rotary head. When a cleaning mode is selected by the mode selection means, the rotation control means controls the rotary head to rotate at a speed slower than the normal speed based on a command from the rotation command means. Is.

[0008]

In the present invention, by selecting the cleaning mode, the rotary head can be rotated at a speed slower than the normal speed based on the command from the rotation command means.
It is not necessary to manually rotate the rotary head when cleaning the rotary head, which makes it possible to improve the cleaning workability.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. This example is a propeller type VTR
It is an example applied to the rotary head device. In the figure, 1
Reference numeral 0 is a control panel unit, 20 is a VTR system control unit, and 30 is a drum motor control unit.

The control panel section 10 comprises a jog dial 11 and a jog dial speed detector 12. Although not shown, a frequency generator (FG) configured optically or magnetically is attached to the rotating shaft of the dial 11, and an FG pulse having a frequency according to the rotation speed of the dial 11 is attached from the frequency generator. PFG is output,
This FG pulse PFG is supplied to the speed detector 12. In the speed detector 12, for example, the FG pulse PFG is counted in a fixed time, and the count data is used as speed data DPC indicating the rotation speed of the dial 11.

The system controller 20 comprises a mode selector 21 and a controller 22. The mode selector 21 selects a cleaning mode for cleaning the rotary head and a normal mode. The mode selection signal SMO from the mode selector 21 is the controller 2
2 is supplied. The speed data DPC output from the speed detector 12 is further supplied to the controller 22.

When the normal mode is selected by the mode selector 21, the controller 22 sets the drum speed according to the VTR state, that is, the reproduction state, the recording state, the stop state, etc., regardless of the rotation speed of the dial 11. The commanded drum speed command signal SSI is output. In this case, a tape speed command signal according to the rotation speed of the dial 11 is supplied from the controller 22 to a control unit of a reel motor and a capstan motor (not shown), and the reproduction speed is controlled according to the rotation speed of the dial 11 during reproduction. .

When the cleaning mode is selected by the mode selector 21, the controller 22 dials 11
The drum speed command signal SSI for instructing the drum speed according to the rotation speed of the is output.

The control unit 30 of the drum motor comprises a reference speed generator 31, a subtractor 32, a drum motor drive amplifier 33, a drum motor 34 and a drum speed detector 35. A drum speed command signal SSI output from the controller 22 is supplied to the reference speed generator 31. The reference speed generator 31 outputs a reference speed signal (voltage signal) VREF corresponding to the drum speed command signal SSI, and the reference speed signal VREF is supplied to the subtractor 32.

The rotating shaft of the drum motor 34 has a frequency generator (F
G) is attached, and an FG pulse P having a frequency corresponding to the rotation speed of the drum motor 34 is attached from this frequency generator.
FGD is output, and this FG pulse PFGD is output to the speed detector 35.
Is supplied to. The speed detector 35 forms a speed signal VDS corresponding to the rotation speed of the drum motor 34 based on the FG pulse PFGD, and the speed signal VDS is supplied to the subtractor 32.

The subtractor 32 obtains the difference of the speed signal VDS from the reference speed signal VREF, supplies the difference signal to the drive amplifier 33, and drives the drum motor 34.
As a result, the speed signal VDS becomes equal to the reference speed signal VREF, so that the rotation speed of the drum motor 34 is outputted from the controller 22 by the drum speed command signal SSI.
Feedback control is performed so that it becomes equal to the rotation speed commanded by.

As described above, in the present embodiment, the drum motor 34 rotates at the rotation speed corresponding to the state of the VTR in the normal mode, and the drum motor 34 rotates at the rotation speed corresponding to the rotation speed of the jog dial 11 in the cleaning mode. . Therefore, the user can rotate the rotary head 3 at an arbitrary speed by selecting the cleaning mode with the mode selector 21 and rotating the dial 11.
Therefore, when cleaning the rotary head, it is not necessary to manually rotate the rotary head as in the conventional case, and the workability of cleaning can be improved.

In the above embodiment, the propeller type (upper drum fixed type) VTR rotary head device is shown, but the present invention is applicable to rotary head devices other than VTR, and further to the upper drum rotary type rotary head device. Can be similarly applied.

In the above embodiment, the rotation speed of the drum motor 34 is controlled according to the rotation speed of the jog dial 11. However, the rotation angle of the jog dial 11 from the reference position is detected, and this rotation angle is detected. The rotation speed of the drum motor 34 may be controlled according to the above.

In the above embodiment, the drum motor 34 is rotated at a rotation speed corresponding to the rotation speed of the jog dial 11 in the cleaning mode. However, in the cleaning mode, the drum motor 34 is rotated at a constant rotation speed by turning the switch on. You may make it rotate continuously by (about several rotations / second).

Further, in the above embodiment, the drum motor 34
Although the rotation direction of the jog dial 11 is not mentioned, the rotation direction may be changed according to the rotation direction of the jog dial 11. This also applies to the one that controls the rotation speed of the drum motor 34 according to the rotation angle of the jog dial 11.

Further, in the above embodiment, the drum motor 34 is utilized by utilizing the jog dial 11 in the cleaning mode.
However, the rotation command means such as a separate dial may be provided.

[0023]

According to the present invention, by selecting the cleaning mode, the rotary head can be rotated at a speed slower than the normal speed based on the command from the rotation command means, which is different from the conventional case when cleaning the rotary head. Moreover, there is no need to manually turn the rotary head, and the workability of cleaning can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a rotary head device according to the present invention.

FIG. 2 is a diagram showing a state during conventional head cleaning.

[Explanation of symbols]

 1 Fixed lower drum 2 Rotating upper drum 3 Rotating head 10 Control panel section 11 Jog dial 12 Jog dial speed detector 20 VTR system control section 21 Mode selector 22 Controller 30 Drum motor control section 31 Reference speed generator 32 Subtractor 33 Drum Motor drive amplifier 34 Drum motor 35 Drum speed detector

Claims (4)

[Claims] 1. A mode selection means for selecting a cleaning mode, a rotation command means for instructing a rotation speed of a rotary head, and a rotation control means for controlling a rotation speed of the rotary head. When the cleaning mode is selected, the rotary head device controls the rotary head so that the rotary head rotates at a speed slower than the normal speed based on a command from the rotation command device. 2. The rotary head device according to claim 1, wherein the rotation command means is a dial, and in the cleaning mode, a rotation speed according to a rotation speed or a rotation angle of the dial is commanded. 3. The rotary head device according to claim 1, wherein the rotation command means is a switch, and commands a constant rotation speed in the cleaning mode. 4. The rotary head device according to claim 2, wherein the dial also commands a rotation direction of the rotary head according to a rotation direction.