JP2822581B2 - Tape recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recording / reproducing apparatus which performs operations such as recording or reproduction by loading a tape from a mounted tape cassette.

[Summary of the Invention] The tape recording / reproducing apparatus of the present invention has a cleaning mechanism configured to clean the head if the head drum rotates when the cleaning pad is in contact with the head drum, for example. The cleaning mechanism is configured to come into contact with the rotating head drum in an unloading state.

Then, means is provided for performing head cleaning by controlling the driving of the rotary head drum when the tape reel brake is on in the unloading state.

[Prior art] In a video recording / reproducing apparatus (VTR), digital audio tape (DAT) player, etc., when performing recording / reproducing,
An operation of pulling out the tape from the mounted tape cassette and winding the tape around a head drum at a predetermined angle, for example, so-called loading is performed. Then, in this loading state, the rotational scanning of the head drum and the running of the tape T are performed,
It is known that a recording or reproducing operation is performed.

By the way, as shown in FIG. 6, for example, if a cleaning mechanism CL is formed so that the cleaning pad P comes into contact with the portion of the rotary head drum 1 where the tape T is not wound, As the drum 1 rotates, head cleaning is performed.

[Problems to be Solved by the Invention] However, as shown in the drawing, keeping the cleaning mechanism CL in contact with the head drum 1 always means that the cleaning pad P gets entangled with the tape T during running of the tape, for example. May occur, and it is not suitable from the viewpoint of the wear resistance of the head.

For this reason, the cleaning mechanism is configured so that the pad P does not contact the head drum 1 during the loading state, and the pad P contacts the unloading operation.
It is conceivable to construct the CL and perform cleaning by rotating the head drum 1 even during the unloading operation. However, even during the unloading operation, the head drum 1 is condensed. In some cases, for example, the tape T sticks to the head drum 1 and does not move away. In such a case, when the pad P is brought into contact with the head drum 1 and the head drum 1 is rotated to perform head cleaning, the tape T There is a problem that T is caught in the head drum 1 and the pad P, and the tape T is damaged.

Means for Solving the Problems The present invention has been made in view of such problems, and the cleaning operation of the head drum is in the unloading state, and the tape reel brake is on. It is to be done only when.

For this reason, a head cleaning mechanism is provided which is separated from the rotating head drum when in the tape loading state, and is brought into contact with the head drum in the unloading state so that the head can be cleaned. The tape recording / reproducing apparatus is provided with means for controlling the head drum to be driven to rotate for a predetermined time during a period in which the head drum is turned on and in a period in which the head drum is in the unloading state.

[Operation] If the tape is not wound around the head drum and the tape reel is locked, even if the head drum is rotationally driven with the cleaning mechanism in contact with the tape drum,
It does not occur that the tape is entangled and damaged.

FIG. 1 (a) shows a loading state of the tape recording / reproducing apparatus of the present embodiment, that is, a tape T is pulled out from a tape cassette C mounted on a cassette deck, and a head drum is drawn. Shows the state of being wound.

1 is a head drum, and 2a and 2b are tape T from a tape cassette C mounted by moving guide grooves Ma and Mb.
Is a roller guide that draws out and winds the head drum 1 at a predetermined angle.

3 is a capstan shaft, and the tape T pulled out is
The pinch roller 4 that moves in the guide groove Mc presses the capstan 3 against the capstan 3 so that the capstan 3 can run. Reference numeral 5 denotes a fixed guide, 6 denotes a swing roller guide, and 7 denotes a tension arm.

Reference numeral 8 denotes a cleaning mechanism adapted to perform head cleaning when a pad 8a attached to one end of the pad 8 comes into contact with the head drum 1.
It is rotatably supported at the shaft portion 8b. The pad 8a is urged to abut the head drum 1 by attaching a spring SP between the other end portion 8c and a predetermined position Z of the deck portion, but is in a loading state as shown in the figure. In this case, since the cleaning mechanism 8 is pushed up by the roller guide 2b, the pad 8a is separated from the head drum 1 against the urging force of the spring SP.

As described above, in the tape recording / reproducing apparatus of the present embodiment, the cleaning operation is not performed because the pad 8a is not in contact with the head drum 1 in the loading state, but the unloading is performed when the tape cassette is ejected. When the roller guide 2b moves in the direction of arrow X as shown in FIG.
The pad 8a comes into contact with the head drum 1 by the action of the SP, and the cleaning operation becomes possible. FIG. 1 (c) shows a state in which the unloading operation has been completed.

When the cleaning mechanism 8 is in the state shown in FIG. 1C after the state shown in FIG. 1B, if the head drum 1 is driven to rotate, the head drum 1 and the pad 8a are rotated.
Because of the sliding, the head cleaning operation can be executed. Since the pad 8a is freely rotatably attached to the shaft 8d, even if the head drum 1 rotates at a high speed as usual, there is no trouble such as damage to the head drum 1.

Next, a drive system circuit block of each mechanism in the present embodiment will be described with reference to FIG.

Reference numeral 10 denotes a mechanical drive system controller (hereinafter, simply referred to as a controller) of the deck unit, which is configured by a microcomputer including a CPU, a ROM, a RAM, and an interface unit. The controller 10 controls tape running (reel drive), loading and unloading operations, and other various mechanical operations based on control information from the main controller 30 of the tape recording / reproducing apparatus.

Reference numeral 11 denotes a T reel motor drive circuit, and reference numeral 12 denotes an S reel motor drive circuit, which drives the respective reel motors 11a and 12a to execute the tape running. Also,
A loading mechanism driving circuit 13 drives the roller guides 2a and 2b, the pinch roller 4 and the like as shown in FIG. 1 by driving the loading motor 13a to perform loading and unloading operations. Also,
A brake plunger drive circuit 14 drives the brake plunger 14a for the reel motor. Reference numeral 15 denotes a head drum drive circuit, which rotates the drum motor 15a to rotate the head drum 1. Each of the above driving circuits is controlled by the controller 10.

The controller 10 includes, as information to be provided for various controls, rotation detection signals from frequency generators (FG) 16a and 16b for rotation detection provided on the S reel and the T reel, and a capstan FG17. On the basis of this, a capstan rotation direction detection signal generated by the direction detection circuit 18 is supplied. Also, a tape top sensor 19, a tape end sensor 20, a cassette detector 21, a recordable detector 22, a soft tape detector 2
3. Various detection signals from the unloading limit detector 24 and the like are also input as operation control information.

The tape recording / reproducing apparatus of the present embodiment is configured as described above as a drive system circuit block, and the controller 10 is based on information from the main controller 30 and each detector.
Various internal programs operate to output control signals to each drive circuit (11,12,13,14,15) to execute necessary operations. Normal operations (recording / reproduction etc.) Reel drive, head drum rotation drive, etc.) are known and will not be described.

In the controller 10 of the present embodiment, in addition to the general operation control block, since the functional blocks shown in FIG. 3 are particularly configured by software, the execution of the cleaning operation of the head drum 1 described later is controlled. ing.

In the figure, reference numeral 41 denotes a tape cassette mounting detection signal from the cassette detector 21 or an unloading limit detector 24.
A timing control means for setting the cleaning operation timing based on the timing at which the unloading operation end detection signal is obtained or from the control signal from the main controller 30, the brake plunger drive circuit 14 Brake control means 43 for performing on / off control of the head drum drive circuit 43. Drum rotation control means for performing rotational drive control for the head drum drive circuit 15.

Reference numeral 44 denotes a loading / unloading operation control means (hereinafter, referred to as operation control means). Based on a loading or unloading instruction from the main controller 30, a control signal for the loading drive circuit 13, and S reel and T reel is provided. Occurs. That is, at the time of loading, the T reel is locked so as not to rotate, the S reel is set free, and then the loading mechanism is driven so that the tape is pulled out from the S reel and loading is executed. At the time of normal unloading, after the T reel is locked, the winding operation is performed on the S reel, and the loading mechanism performs the reverse operation of the loading operation, so that the tape that has been pulled out is placed in the tape cassette. Control to store. In the case of the present embodiment, the loading start timing is controlled by the timing control means 41 as described later.

The cleaning operation that can be performed by each of the above functional blocks will be described with reference to FIGS. 4 and 5.

First, the cleaning operation during loading is shown in the timing chart of FIG. 4 (a) and the flowchart of FIG. 4 (b). Each step of the flowchart is represented by F100 to F107.

First, when the tape cassette is mounted on the deck of the tape recording and reproducing apparatus in t ₀ time (F100), the cassette detector 21
The timing control means 41 supplies a timing signal for turning on the reel brake to the brake control means 42 to turn on the reel brake by the signal from the controller (F10).
1). And further after a predetermined time has elapsed (t ₁ point), it commands the drum rotation control means 43, causing the head drum 1 rotationally driven (F102, F 103). At this time, the mechanism of the deck portion is in the unloading state shown in FIG.
If the head drum 1 is rotated, the contacting pad 8a
As a result, a cleaning operation is performed.

Then after a predetermined time has elapsed (t ₂ time) the head drum rotation drive is stopped (F 104, F105), a further after a predetermined time has elapsed (t ₃ time points), with a possible tape drawer by releasing the reel brake, A command is issued to the operation control means 44 to execute loading (F106, F107). By loading, the tape is pulled out of the tape cassette and wound around the head drum 1 (in a state shown in FIG. 1A), and a standby state for normal operations such as recording and reproduction is performed. The cleaning mechanism 8 will be spaced apart from the head drum 1 is pushed by the roller guide 2b at t ₄ time during the loading operation.

Next, the unloading operation is shown in the timing chart of FIG. 5 (a) and the flowchart of FIG. 5 (b). Each step of the flowchart is indicated by F200 to F209.

Reproducing, recording, when the operation such as fast forward is completed, i.e., at t ₁₀ when the controller 10 by the stop command tape running stop control reel drive or the like is stopped from the main controller 30, the brake control means 42 Turn on the reel brake (F200, F201). And for example, if the main controller 30 is unloading command at t ₁₁ time, the brake control means 42 as well as releases the reel brake, unloading operation described above is executed by the operation control unit 44 (F204). In t ₁₂ time during unloading operation, so that as shown in Fig. 1 (b), a cleaning mechanism 8 pushed by the roller guide 2b is released to contact the head drum 1.

In t ₁₃ time, when the end of unloading the unloading limit detection unit 24 is detected, the timing control unit 41 of the reel brake by supplying the timing signal to be turned on a reel brake to the brake control means 42 and on (F 205), after a predetermined time elapses (t ₁₄ time), commands the drum rotation control means 43, rotates the head drum 1 (F206, F207). At this time, by rotating the head drum 1, the contacting pad
The cleaning operation is performed by 8a. Then after a predetermined time has elapsed (t ₁₅ time) the head drum rotation drive is stopped (F208, F209), and terminates the cleaning operation.

As described above, in the tape recording / reproducing apparatus of the present embodiment, the pad 8a is not in contact with the head drum 1 in the loading state, but is in contact with the unloading operation. 8
Is possible during the unloading or after the end of the unloading, but during the cleaning possible period, particularly, only before the execution of the loading operation or after the end of the unloading operation, that is, the reel brake is turned on. Since the head cleaning is performed by rotating the head drum 1 for a predetermined time only during a period in which the head drum 1 can be cleaned, an accident that the tape is caught between the head drum 1 and the pad 8a during the cleaning operation does not occur. Even if the tape remains stuck to the head drum 1 even after unloading due to dew condensation on the head drum 1, the cleaning operation (head drum 1
Is performed when the reel brake is turned on, so that a tape winding accident cannot occur.

It should be noted that the above-described cleaning operation can simultaneously reduce the dew condensation. Needless to say, the cleaning operation may be performed based on a manual operation.

[Effects of the Invention] As described above, the tape recording / reproducing apparatus of the present invention is provided with a cleaning mechanism that comes into contact with the head drum in association with the unloading operation. Since the cleaning operation is performed by rotating the drum, there is an effect that occurrence of a tape entanglement accident due to the cleaning operation can be almost completely prevented.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) are explanatory views of a cleaning mechanism of a tape recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a drive system circuit of the tape recording / reproducing apparatus of the embodiment. FIG. 3 is a functional block diagram configured by software in the controller of the present embodiment. FIGS. 4A and 4B are a time chart and a flowchart showing a cleaning operation before a loading operation. (B) is a time chart and a flowchart showing the cleaning operation after the unloading operation, and FIG. 6 is an explanatory diagram of the cleaning mechanism. 1 is a head drum, 2a and 2b are roller guides, 8 is a cleaning mechanism, 8a is a pad, 10 is a controller, 11 is a T reel motor drive circuit, 12 is an S reel motor drive circuit, 13
Is a loading mechanism drive circuit, 14 is a brake plunger drive circuit, 15 is a head drum drive circuit, 30 is a main controller, 41 is a timing control means, 42 is a brake control means, 43 is a drum rotation control means, and 44 is an operation control means. Is shown.

Claims (1)

(57) [Claims] 1. A tape recording / reproducing apparatus which performs a tape running operation by loading a tape from a mounted tape cassette. The tape recording / reproducing apparatus is separated from a rotary head drum when in a tape loading state and is rotated when in an unloading state. In addition to providing a head cleaning mechanism that is in contact with the head drum to be in a head cleaning enabled state, the rotating head ram is driven during a period in which the tape reel brake is on and in an unloading state. A tape recording / reproducing apparatus, comprising: means for controlling to be driven to rotate for a predetermined time.