JPH0266762A - Tape recorder device - Google Patents

Abstract

PURPOSE:To satisfactorily and surely execute the tension control of a tape with a simple mechanism by driving a control cam so as to make pressure due to a brake mechanism into prescribed pressure based on a value detected by a tension detecting part. CONSTITUTION:When a tension detecting arm 39 is moved by a contact pin 39a to contact with a tape, a position detecting sensor detects the movement and an error signal is outputted. When the detected tension is larger than a reference value, a control slider 18 is driven by a worm gear and a transmission gear so as to move in a C2 direction and a control cam 1 is rotated in an A2 direction. When the slider 18 is moved, a control pin 25a is moved along the notch part of the slider 18 and a lever 25 is rotated. Consequently, the energizing force of a coil spring 24 becomes small, the friction force to a supply reel 36a of a brake pad 23 becomes small and the tension of the tape becomes a prescribed value. Thus, the tape tension can be controlled satisfactorily and surely with a simple constitution.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a tape recorder device.

(Prior Art) Tape recorder devices that record and playback using audio/visual video cassette tapes have become widespread, and recently, digital audio tape cassettes (hereinafter referred to as DAT cassettes) have been used to record and play back digital signals. Tape recorder devices capable of recording and reproducing have appeared.

The above-mentioned DAT cassette is approximately 1/2 the size of a conventional compact cassette tape, and has 1. The cassette body is equipped with a lid and a slider, and the lid covers the tape surface and the slider covers the hub hole.When the cassette is not set in a tape recorder, there is no dust inside the cassette, which can cause dropouts during digital recording. It has a sealed structure to prevent dirt and dust from entering.

When this DAT cassette is set in a tape recorder device, the slider is moved to expose the hub hole.
In addition, the lid is opened and the tape is engaged with guides and rollers, and the tape is wound around the rotating head drum by these guides and rollers to perform digital recording and playback.

Therefore, in the tape recorder device described above, the DAT
A rope ink mechanism is used to automatically set the cassette on the rotating head drum.

This loading mechanism allows the DAT cassette to be inserted into the cassette insertion slot of the tape recorder body.
A cassette is attached to a cassette holder, and the DAT cassette attached to the cassette holder is pulled in so as to move on a drive mechanism provided inside the tape recorder,
First, the slider is moved in the opening direction, then the lid is opened, and then the cassette holder is lowered and the DAT cassette is mounted on the drive mechanism. From this state, the tape is pulled out by a guide or roller and wound around a rotating head drum for digital recording and playback.

By the way, in the above-mentioned tape recorder device using a DAT cassette, the tape of the DAT cassette is guided to a rotating head drum by a drive mechanism equipped with a guide, rollers, etc., and a predetermined tension is applied to the tape by a tension servo mechanism. There is.

As the above-mentioned tension servo mechanism, a mechanical tension servo mechanism using a band brake wound so as to contact the tip reel or a logic tension servo mechanism using a direct drive motor that directly drives the tip reel are used.

However, in the conventional tape recorder device described above, when a mechanical tension servo mechanism is used as the tension servo mechanism, a band brake is provided almost all around the tape reel, and this band brake is independent of the tape drive mechanism. The mechanism was complicated, and it was difficult to save space.

Further, when a logic tension servo mechanism is used, there is a problem that control by the motor becomes complicated, which is disadvantageous in terms of cost.

(Problems to be Solved by the Invention) As described above, in conventional tape recorder devices, when controlling the tape tension mechanically, the mechanism is complicated and it is difficult to save space, and when controlling the tape tension using logic, it is difficult to save space.
The problem was that the control was complicated and it was disadvantageous in terms of cost.

The present invention is intended to solve the above-mentioned problems, and is a tape recorder device that has a simple mechanism, can perform tape tension control well and reliably, and can save space and cost. is intended to provide.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a tape recorder device that pulls out the tape of a cassette tape from a cassette half and records and plays back the tape using a rotating head. a tape guide mechanism that guides the tape; a tape drive mechanism that pulls out the tape of the cassette tape and drives the tape; a pair of tape reels that supply and wind up the tape driven by the tape drive mechanism; a brake mechanism that applies a predetermined tension to the tape by contacting the lower reel on the side with a predetermined pressure; a tension detection section that detects the tension of the tape driven by the tape drive mechanism; a control slider for controlling movement and pressure by the brake mechanism; a control cam for moving the control slider; and a control cam for controlling the pressure by the brake mechanism based on a value detected by the tension detector. It is equipped with a drive control mechanism for driving.

(Function) In this invention, the control cam is driven so as to control the pressure by the brake mechanism to a predetermined pressure based on the value detected by the tension detection section. The tension can be controlled well and reliably, and space and cost can be reduced.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 and 2 are diagrams for explaining a tape recorder device according to an embodiment of the present invention.

In these figures, 1 indicates a control cam rotatably disposed on a rotating shaft 1a. On the outer periphery of the control cam 1,
A gear 2 is formed, and this gear 2 is connected to a transmission gear 3,
Rotationally driven by a motor 6 via a worm gear 4.5, the control cam 1 is rotated in the directions of arrows A1 and A2. A pattern detection gear 7 is meshed with the gear 2 of the control cam 1, and the mode state is detected based on the rotational position of the pattern detection gear 7. The control cam 1 also has a control groove 8a for loading,
A control groove 8b for mode switching is formed. A protrusion 9a for operating a rotatably disposed loading lever 9 is inserted into the control groove 8a for loading of the control cam 1, and is rotated in the directions of arrows B and B2 by rotation of the control cam 1. It has become so. A gear 10 is formed on the loading lever 9.

At the tip side of the gear 10 of the loading lever 9, loading gears lla and l are meshed with each other and are rotatable.
One of the rodding gears lla is meshed with the gear 10.

Loading arms 12a, 1.2b are fixed to the loading gears lla, llb. The loading arms 12a and 12b include a loading link 13a,
13b is rotatably provided. A tape drawer slider 4 is provided at the tip of the loading links 13a and 13b.
a and 14b are provided. Tape drawer slider 4
a, 14b are base plates 15a, 15b and guide rollers 16a11 provided on each base plate 15a, 15b.
6b, and guide pins 17a and 17b.

Further, a control pin 19 of the control slider 8 is inserted into the mode switching control groove 8b of the control cam 1. The control slider 8 has elongated holes 20a, 20 for controlling the movement position.
b is formed, the elongated hole 20a is engaged with the rotating shaft 1a of the control cam 1, and the elongated hole 20b is engaged with a protrusion 21 of the main chassis (not shown). The control slider 8 is movable in the directions of arrows C1 and C2 by rotation of the control cam 1. Further, a control groove 18a for brake control is formed in the control slider 8, and a control pin 22a of the brake lever 22 is inserted into the control groove 18a. The brake lever 22 is provided at a rotating position on a sub-chassis (not shown). A brake pad 23 is formed on one side of the brake lever 22, and the other side is connected to a tension control lever 25 via a coil spring 24. The tension control lever 25 is rotatably disposed on a sub-chassis (not shown). The tension control lever 25 is provided with a control pin 25a, and the control pin 25a is connected to the control slider 18.
is in contact with the notch 26 for tension control.

Further, the control slider 18 is formed with a control groove 27 for controlling the pinch roller. A control pin 28a of a pinch roller pressurizing lever 28 is engaged with the control groove 27. The pinch roller pressurizing lever 28 is rotatably attached to two rotating shafts of a main chassis (not shown). The pinch roller pressurizing lever 28 includes a bent piece 30a of a pinch roller support lever 30 rotatably disposed on the rotating shaft 29.
is locked. A pressurizing spring 31 is disposed on the rotating shaft 29 . One end of the pressure spring 31 is locked to the bent piece 30a of the pinch roller support lever 30, and the other end is locked to the pinch roller pressure lever 28. A pinch roller 32 is rotatably disposed on the pinch roller support lever 30, and the pinch roller 32 is pressed against a capstan shaft 33 when the pinch roller support lever 30 is moved forward. . Further, a guide protrusion 32a is formed on the pinch roller support lever 30, and a guide groove 34a of the guide roller support lever 34 is engaged with the guide protrusion 32a.

The guide roller support lever 34 is rotatably disposed on the main chassis (not shown), and the guide roller support lever 34 includes a guide roller 35 that kites the tape.
A guide post 33a is provided near the capstan shaft 33 to guide the tape toward the capstan shaft 33.
is installed.

Also, on the control slider 18, a tape supply reel 36a is provided.
and a tape take-up reel 36b are arranged to be rotatably driven by a drive mechanism (not shown). The brake pad 23 of the brake lever 22 mentioned above is in contact with the tape supply reel 36a.

Further, a guide post 37 is disposed on the main chassis (not shown) of the tape pull-out slider 14a described above at a predetermined position from which the tape pull-out slider 14a is fed out. A rotary head drum 38 for recording and reproducing information on the tape is disposed between the positions of the tape pull-out sliders 1.4a and 14b from which the tape pull-out sliders 14a and 1.4b are fed out. There is.

Also, near the guide post 37 described above, there is a tension detection arm 39 that controls the contact pin 39a that contacts the tape.
is arranged rotatably, and the tension detection arm 3
9 is urged toward the tape with a predetermined pressure by a spring (not shown). In addition, the tension detection arm 3
A position detection sensor 40 is located near the arm 39 with the arm 39 in between.
or is arranged. The position detection sensor 40 detects the amount of movement of the tension detection arm 39, and applies a detection signal corresponding to the amount of movement to a motor control circuit (not shown) that drives the motor 6 described above.

Next, the operation of the tape recorder device configured as described above will be explained.

First, a DAT cassette (not shown) is attached to a cassette holder (not shown). At this time, it is released by the slider of the DAT cassette (not shown) or the claw of the cassette holder, and the tape drawer slider 1.4a is released on the back side of the tape.
, 4b are placed. Next, the motor 6 is rotated, and the control cam 1 is rotated in the direction of arrow A1. As a result, the rope ink lever 9 is rotated in the direction of arrow B1. As a result, the loading gears lla and llb rotate, the tape pull-out sliders 14a and 14b move forward, and the tape is pulled out toward the rotating head drum 38. Simultaneously with the above-mentioned operation, the control slider 18 moves in the direction of arrow C2 and moves forward toward the pinch roller support lever 30 or the capstan shaft 33. And as shown in Figure 2,
The tape from the tape supply reel 36a or the guide roller 3
7. Tape drawer slider 1.4a guide roller 16
a1 is brought into contact with the rotary head drum 38 via the guide pin 17a, and is guided between the pinch roller 32 and the capstan shaft 33 via the guide pin 17b1 of the tape drawer slider 1.4b, the guide roller 16b1, and the guide roller 33a; The tape from the capstan shaft 33 is guided by the guide roller 35 and reaches the tape take-up reel 36b. Further, a contact pin 39a of the tension detection arm 39 is arranged between the guide post 37 on the tape supply side and the guide roller 6a of the tape pull-out slider 14H, and is in contact with the tape.

In this state, when the tape is driven to perform recording or reproduction, the rotation of the capstan shaft 33 drives the tape pressed by the pinch roller 32, and at the same time, the tape supply reel 36a and The tape take-up reel 36b is rotated, and the tape passes from the tape supply reel 36a, passes through the rotary head drum 38, is driven by the rotation of the capstan shaft 33, and is wound onto the tape take-up reel 36b. [4] When the above-mentioned tape is running, the brake pad 23 of the brake lever 22, which is biased by the coil spring 24, is brought into contact with the tape supply reel 36a, and a predetermined tension is applied to the tape. The tension is detected and controlled by a tension detection arm 39 and a position detection sensor 40.

Next, tape tension control will be explained using the block diagram of FIG.

As shown in the figure, when the tension detection arm 39 is moved by the contact pin 39a that contacts the running tape (a), the movement amount of the arm is detected by the position detection sensor 40, and a tension error signal is output. (b). This tension error signal is then outputted to the motor 6 (C) via the amplifier (d). If the detected tension is greater than the reference value, the control slider 18 is moved by the arrow C.
The motor 6 is rotated so as to move in two directions, which rotates the worm gear 4.5 and the transmission gear 3 (
e), the control cam 1 is rotated in the direction of arrow A2 (f).

This rotation moves the control slider 18 in the direction of arrow C2, thereby guiding the control pin 25a of the tension control lever 25 along the notch 26 of the control slider 18, and the tension control lever 25 rotates (g
).

As a result, the biasing force of the coil spring 24 becomes smaller, and the frictional force of the brake pad 23 against the tape supply reel 36a becomes smaller (h). Thereby, the tension of the tape is controlled to a predetermined value. Incidentally, the rotation of the control cam 1 is detected by the pattern detection gear 7 (i), and a closed loop control system is constructed in which the position is controlled.

Therefore, in this embodiment, the tension of the tape is detected by the tension detection arm 39 and the position detection sensor 40 and the loading motor 6 is rotated, thereby moving the control cam 1 and the control slider 18 and reeling the tape supply reel 36a. Brake lever 2 that comes into contact with
Since the friction force of the second brake pad 23 is controlled, the tape tension can be controlled well and reliably with a simple mechanism, and space and cost can be reduced.

In the above-mentioned embodiments, a tape recorder device using a DAT cassette was particularly described, but it goes without saying that the present invention may be applied to a tape recorder device that uses a conventionally used videotape.

[Effects of the Invention As explained above, the tape recorder device of the present invention has
Since the control cam is driven to control the pressure applied by the brake mechanism to a predetermined pressure based on the value detected by the tension detection section, the tape tension can be controlled well and reliably with a simple mechanism. It is possible to save space and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining a tape recorder device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 shows the operation and tension control in the tape recorder device of FIG. This is a block diagram for explanation. 1...Control cam, 9...Loading lever 14a
s14b... Tape drawer slider, 18... Control slider, 22... Brake lever 23... Brake pad, 24... Coil spring, 25... Tension control lever 3'6a... Tape supply reel, 36b
... Tape winding reel, 38 ... Rotating head drum, 39 ... Tension detection arm, 40 ... Position detection sensor. Applicant: Toshiba Corporation

Claims (1)

[Scope of Claim] A tape recorder device that pulls out the tape of a cassette tape from a cassette half and records and plays back the tape using a rotating head, comprising: a tape guide mechanism that pulls out the tape of the cassette tape and guides the tape; and the cassette tape. a tape drive mechanism that pulls out the tape and drives the tape; a pair of tape reels driven by the tape drive mechanism that supplies and winds up the tape; a brake mechanism that applies a predetermined tension to the tape; a tension detector that detects the tension of the tape driven by the tape drive mechanism; and a control that controls the movement of the tape guide mechanism and the tape drive mechanism and the pressure applied by the brake mechanism. A slider, a control cam that moves the control slider, and a drive control mechanism that drives the control cam to control the pressure by the brake mechanism based on the value detected by the tension detector. tape recorder device.