JP2870956B2 - Tape loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial application field B Outline of the invention C Conventional technology D Problem to be solved by the invention E Means for solving the problem (FIGS. 1 and 3) F function (FIGS. 1 and 3) G embodiment (G1) Tape loading mechanism (FIG. 2) (G2) First sub-loading mechanism (FIG. 3) (G3) Tape loading apparatus according to the embodiment (FIG. 1) (G4) Other embodiments The present invention relates to a tape loading apparatus, for example, a tape loading apparatus which is suitable for being applied to a tape loading apparatus of a video tape recorder configured to pull out a tape from a tape cassette and wind it around a drum. It is.

SUMMARY OF THE INVENTION The present invention relates to a tape loading device, in which the arm angle of a tension arm that movably holds a tape during tape loading after a tape pull-out operation in response to a main loading mechanism is set to a predetermined angle. By controlling the tension of the tape, the tape can be smoothly loaded at a constant tension.

C Prior Art Conventionally, a tape loading device of a video tape recorder has a tape cassette loaded on a video tape recorder, and a guide roller, an inclined guide, a pinch roller, a tension pin and the like arranged in the tape cassette. By moving to a predetermined position,
The tape can be loaded in a predetermined arrangement.

In practice, the distance that the guide roller, the inclined guide, the pinch roller, and the tension pin move from the inside of the tape cassette to the respective predetermined positions is different from each other, so that the speed at which the tape is drawn out during the loading is not constant but changes constantly.

During loading, for example, there is a type in which a current flowing through a reel motor composed of a DC motor is controlled to be constant, and a constant tape tension is applied to the tape by controlling the torque of the reel motor.

D Problems to be Solved by the Invention However, as described above, when the speed at which the tape is drawn out is constantly changing, it is difficult to maintain a constant tape tension by controlling the torque of the reel motor. is there.

In such a state, the tape tension is lowered during tape loading, and the tape is loosened. Conversely, the tape tension is raised, and the tape is elongated, resulting in a great deal of damage to the tape.

Therefore, it is conceivable to perform a tension servo during tape loading. In other words, such a tension servo keeps the position, that is, the angle, of the tension arm that is supported on one side by a spring and moves freely with the tape,
Thereby, the tape tension can be controlled to be constant.

In fact, such a tension arm must move freely so that the change in tape tension is transmitted directly.
In addition, since the servo control is performed so that the position of the tension arm is constant, the tape tension needs to be uniquely determined with respect to the position of the tension arm.

By the way, in order to reduce the size of a mechanical deck including a tape loading mechanism and the like, there is a type in which a drum and a tape cassette are remarkably brought close to each other. The tape loading mechanism used for mechanical decoding has a problem that it is difficult to use the above-described tension servo because the tension arm itself moves during tape loading.

The present invention has been made in view of the above points, and a tape loading device capable of controlling a tape with a constant tape tension as quickly as possible even when a tension arm moves during tape loading. It is something to propose.

E To solve the problem, in the present invention, in the tape loading device 40 for pulling out the tape 2 from the tape storing means 1 for storing the tape 2 and winding the tape 2 around the drum 7, the tape loading device 40 starts the tape loading. A first section α0 from the position θ0 to the first position θ1, the tape pulling means 3, 4, 5, 6 for pulling out the tape 2 from the tape storage means 1 in response to the main loading mechanisms 3, 4; 1 from the position θ1 to the end position θ2 of the tape loading.
The section α1, the winding means 3, 4, 5, 6 for winding the drawn tape 2 around the drum 7, the second section α1, the tension arm 21 for movably holding the tape 2, and the second section α1,
A section 41 for detecting the rotation angle of the tension arm 21 in the section α1, and a control section 43 for controlling the tape tension to be constant according to the rotation angle of the tension arm 21 in the second section α1. I made it.

F action The second section α during tape loading after the tape drawing operation in response to the main loading mechanisms 3 and 4.
1. Tension arm 21 for movably holding tape 2
By controlling the tape tension constant according to the rotation angle of the tape 2, the tape 2 can be smoothly loaded with a constant tape tension.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(G1) Tape Loading Mechanism FIG. 2 shows a tape loading mechanism used in the tape loading apparatus according to the present invention as a whole, and a tape cassette 1 in which a magnetic tape 2 is wound around a supply reel 1A and a take-up reel 1B. Immediately after the tape cassette 1 is loaded, the magnetic tape 2 drawn out from the supply reel 1A inside the tape cassette 1 as shown by the dashed line in FIG.
The tape is guided by two tape guides 1C and 1D provided inside and wound around a take-up reel 1B.

In the tape cassette 1 in this state, the magnetic tape 2
Inside, a tilt guide 3A, a fixed guide 3B and a roller guide 3C, a tilt guide A and a fixed guide 4B, a tension pin 5A, a roller guide 6A and a pinch roller 6B are housed.

This inclined guide 3A, fixed guide 3B and roller guide 3C
And the inclined guide 4A and the fixed guide 4B are disposed on the first and second main loading mechanisms 3 and 4, respectively. The tension pin 5A and the roller guide 6A and the pinch roller 6B are respectively connected to the first and second main loading mechanisms. Are arranged on the sub-loading mechanisms 5 and 6.

Thus, for example, when the loading motor starts operating, the first and second main loading mechanisms 3 and 4 move in the directions of arrows a1 and b1, and the first and second sub-loading mechanisms 5 and 6 move in the directions of arrows c1 and c1. move in the direction d1, and thus move the tape 2 from the tape cassette 1.
Is wound around the drum 7 at a predetermined winding angle.

When the loading motor starts to rotate in the reverse direction, the main loading mechanisms 3, 4 and the sub loading mechanisms 5, 6 move in the directions of arrows a2, b2, c2, d2, respectively. The tape 2 is stored.

Actually, when the magnetic tape 2 is being loaded, the magnetic tape 2 led out from the supply reel 1A of the tape cassette 1, as shown by a solid line in FIG.
8A, tension pin on first sub-loading mechanism 5
The roller is guided to the roller guide 3C, the fixed guide 3B, and the inclined guide 3A on the first main loading mechanism 3 through the roller guide 5A, the roller guide 8B, and the entire erasing head 9A.

Also, a tilt guide on the second main loading mechanism 4
The magnetic tape 2 that has passed through the fixed guide 4A and the fixed guide 4B has a fixed guide 10A, a control track recording / reproducing head 9B,
The recording / reproducing head 9C for time code, the pinch roller 6B and the capstan 11 are sandwiched between the fixed guide 10B and driven.
The tape is guided by the roller guide 6A and the roller guides 8C and 8D, and is taken up on the take-up reel 1B in the tape cassette 1.

Here, in the case of the tape loading mechanism of this embodiment,
The distance between the tape cassette 1 and the drum 7 is reduced as much as possible, so that the overall size can be reduced.

Since the distance between the tape cassette 1 and the drum 7 is shortened in this way, in this tape loading mechanism, an overlap section in which the reciprocating paths of the first main loading mechanism 3 and the first sub-loading mechanism 5 interfere. Occurs.

For this reason, in this tape loading mechanism, the first sub-loading mechanism 5 is used during the overlap section.
Can move before the first main loading mechanism 3.

(G2) First sub-loading mechanism In FIG. 3, reference numeral 5 denotes a part of the first sub-loading mechanism, and the tension arm 21 is attached to the fulcrum shaft 20 so as to be rotatable in the directions of arrows e1 and e2. Tension pin 5A that also serves as a tension regulator at the tip
Has been planted.

A guide plate 22 is fixed below the tension arm 21. The guide plate 22 has a guide groove 23 parallel to the tension arm 21 and having a narrow groove width. An opening 24 is formed.

In response to the first main loading mechanism, a drive pin 27 set on the tip of a loading arm 26 that rotates in the directions of arrows f1 and f2 about the fulcrum shaft 25 is inserted into the guide groove 23.
And movably engaged in the opening 24. The diameter of the drive pin 27 is selected to be substantially equal to the width of the guide groove 23.

Further, a spring locking plate fixed below the tension arm 21
A tension spring 30 composed of a tension spring is mounted between a pin 29 erected on 28 and a drive pin 27 of the loading arm 26.

With such a configuration, facing the tension arm 21,
Loading arm 26 driven to rotate in the directions of arrows f1 and f2
As a result, the drive pin 27 is moved in the guide grooves 23 in the directions of arrows g1 and g2 in the direction of the perspective of the fulcrum shaft 20 of the tension arm 21. Then the tension arm 21 points to the arrow e.
1, driven to rotate in the e2 direction.

Actually, during a section α0 in which the loading arm 26 moves from the tape loading start position θ0 indicated by a solid line in FIG. 3 to a first position θ1 having a predetermined angle, the loading start position θ0 is at an intermediate position. During the section α10 up to θ10, the driving pin 27 moves the guide groove 23 in the direction of the arrow g1 to move the section α from the intermediate position θ10 to the first position θ1.
During 11, the drive pin 27 moves in the guide groove 23 in the direction of arrow g2.

Thereby, the tension arm 21 is centered on the fulcrum shaft 20,
The magnetic tape 2 is moved on the movement locus c in the direction of the arrow e1. At this time, the magnetic tape 2 is pulled out to a predetermined position in response to the loading arm 26 corresponding to the tape pulling-out operation of the first main loading mechanism.

Subsequently, the section α1 in which the loading arm 26 moves from the first position θ1 to the tape loading end position θ2.
In between, the drive pin 27 moves from the guide groove 23 to the opening 24, and as a result, the drive pin 27 can move freely in the opening 24.

In this state, the tension arm 21 is urged in the direction of arrow e1 by the tension force of the tension spring 30 and is also urged in the direction of arrow e2 by the tension of the magnetic tape 2.

As a result, the tension force of the tension spring 30 and the magnetic tape 2
The tension arm 21 is positioned at a position where the tension is balanced.

(G3) Tape Loading Apparatus According to the Embodiment In FIG. 1 where the same reference numerals are assigned to the corresponding parts in FIGS. 2 and 3, reference numeral 40 designates a tape loading apparatus as a whole according to the present invention. Tension arm 21
Of the fulcrum shaft 20 through a bearing 20A
It is connected to the.

The angle detector 41 detects the angle of the tension arm 21 and converts the angle into a voltage. An angle detection voltage Vθ corresponding to the arm angle is input to the analog digital conversion circuit 42, and the resulting angle voltage data DTθ is obtained. Are input to a tension detection circuit 43A of a tape loading control circuit 43 having a micro computer configuration.

Thus Tenshiyon detection circuit 43A is the numeric Chillon data D _TC corresponding to the angle voltage data DTθ occurs, and sends this to Tenshiyon control circuit 43B.

The Tenshiyon control circuit 43B compares the reference Ten Chillon data held therein and ten Chillon data D _TC, generates Tenshiyon control data C _TC corresponding to the error component,
This is input to the first input terminal a of the control switching circuit 43C.

In addition, the tension detection circuit 43A detects the first or second input terminal a or b based on whether or not the angle voltage data DTθ is equal to or more than voltage data corresponding to a predetermined angle (in this case, 25 degrees). It generates a control switching signal C _TS to select, and sends this to the control switching circuit 43C.

The drive current I _RL representing the torque of the reel motor 44 driving the supply reel 1A is input to the analog digital conversion circuit 42, and the resulting torque current data DT _RL is sent to the torque control circuit 43D of the tape loading control circuit 43. Is entered.

The torque control circuit 43D compares the torque current data DT _RL with the reference torque current data held therein, and generates torque control data C _RL corresponding to the error, and this is the second control signal of the control switching circuit 43C. It is input to the input terminal b.

Note Tenshiyon control data C _TC or torque control data C _RL is sent from the output terminal c of the control switching circuit 43C is a pulse signal having a pulse width corresponding to the input data values to a pulse width modulation (PWM) circuit 46 It is converted and sent to the DC conversion circuit 47.

The DC conversion circuit 47 converts the input pulse signal into a DC current, and inputs the DC signal to a motor drive circuit 48, where the drive current DRV
As a result, the rotation of the rotation shaft 44A of the reel motor 44 is transmitted to the supply reel 1A through the belt 45.

Thus, the rotation of the supply reel 1A is controlled by a predetermined amount so that the magnetic tape 2 can be given a desired tension.

In the above configuration, first, during the section α0 in which the loading arm 26 moves from the tape loading start position θ0 to the first position θ1 that is a predetermined angle, the tension arm 21 responds to the movement by 0 °. motion from up to 25 degrees, the sub connexion Tenshiyon detection circuit 43A is Yotsute to control selection signal C _TS detects this, selects the second input terminal b of the control selection circuit 43C.

As a result, the tape loading control circuit 43 constantly controls the drive current I _RL supplied to the reel motor 44 to be constant, thus forming a torque servo loop.

In such a state, the tension arm 21 moves at least 25 degrees at a timing when the loading arm 26 passes the first position θ1 during tape loading, and as a result, the tension detection circuit 43A detects this and controls and selects. selecting a first input terminal a of the O connexion control selection circuit 43C to the signal C _TS.

Thus, the tape loading control circuit 43 uses the tension force of the tension spring 30 and the tension of the magnetic tape 2 to generate a drive current for controlling the tension of the magnetic tape 2 so that the tension arm 21 maintains a predetermined angle. Then, a tape tension servo loop is formed in this way, and the tension of the magnetic tape 2 is kept constant, so that the magnetic tape 2 can be smoothly loaded.

According to the above configuration, during the tape loading after the magnetic tape 2 is pulled out by the movement of the tension arm 21 in response to the loading arm 26, the tension arm
Magnetic tape 2 so that the arm angle of 21 becomes a predetermined angle
The tape loading device 40 capable of smoothly loading the magnetic tape 2 with a constant tape tension can be realized.

Thus, it is possible to prevent an unnecessary tension from being applied to the magnetic tape 2 during the tape loading,
The tape loading device 40 that can effectively avoid damage to the magnetic tape can be realized.

(G4) Other Embodiments (1) In the above embodiment, the case where the tape loading apparatus according to the present invention is applied to the tape loading mechanism having the tension arm as described above with reference to FIG. 3 has been described. However, the tension arm of the tape loading mechanism is not limited to this, and various structures may be used as long as the tape can be freely held during tape loading after the tape pull-out operation in response to the main loading mechanism. You may do it.

(2) In the above-described embodiment, the case where the supply reel is driven by the belt has been described. Alternatively, the supply reel may be driven directly, and not only the supply reel but also the take-up reel alone or both may be controlled. Alternatively, a tension servo may be formed.

(3) In the above embodiment, the case where the present invention is applied to a video tape recorder has been described. However, the present invention is not limited to this, and a recording / reproducing apparatus using another tape-shaped recording medium such as a digital audio tape recorder. It is also suitable for wide application.

H Effects of the Invention As described above, according to the present invention, the second section during tape loading after the tape pull-out operation in response to the main loading mechanism, the rotation angle of the tension arm that movably holds the tape By controlling the tape tension to be constant in accordance with the above, a tape loading apparatus which can smoothly load the tape with a constant tape tension and thus can further improve the protection of the tape can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an embodiment of a tape loading device according to the present invention, FIG. 2 is a schematic plan view showing a tape loading mechanism, and FIG. FIG. 4 is a schematic plan view showing the sub-loading mechanism of FIG. DESCRIPTION OF SYMBOLS 1 ... Tape cassette, 1A ... Supply reel, 2 ... Magnetic tape, 5A ... Tension pin, 21 ... Tension arm, 40 ... Tape loading device, 41 ... Angle detector, 43 ... Tape low Ding control circuit, 44 ... Reel motor.

Claims (1)

(57) [Claims] 1. A tape loading device for pulling out the tape from a tape storage means for storing the tape and winding the tape around a drum, wherein a first section from a tape loading start position to a first position, a main loading mechanism. Responsively, a tape pull-out means for pulling out the tape from the tape storage means, a second section from the first position to the end position of the tape loading, a winding means for winding the drawn-out tape around the drum A second section, a tension arm for movably holding the tape; a second section, a detecting means for detecting a rotation angle of the tension arm; a second section, the tension. Control means for controlling the tape tension constant according to the rotation angle of the arm. Deingu apparatus.