JPH03156767A - Tape type recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a magnetic tape in a cassette from interfering with a sensor by utilizing a tape eject lever mechanism and adopting a movable detection sensor of a tape end in interlocking with the operation of the level mechanism so as to allow a common sensor to detect a tape end of two kinds of cassettes. CONSTITUTION:A tape end detection sensor 5 is fitted onto a moving arm 4. When a 1st tape cassette 7 is placed, the moving arm 4 is pressed into contact onto a stop by the energizing of a spring 42 and the detection sensor 5 is placed to a prescribed position able to detect the tape end. On the other hand, when a 2nd tape cassette 71 is loaded, the moving arm 4 is driven against the spring 42 by the drive attended with the revision of the standby position of a tape leadout lever mechanism 3 and the detection sensor 5 is placed at a position retrogressed from a prescribed tape end detection position. Thus, the tape end of two kinds of cassettes is detected and the interference between the tape and the sensor at cassette loading is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to two types of tape type recording and reproducing apparatuses such as video tape recorders (VTRs) and digital audio recorders (DATs) with different casing sizes. The present invention relates to a recording and reproducing device capable of recording and reproducing signals on a tape cassette.

(Prior Art) Currently, the tape cassettes used in VH8 VTRs have the same width of magnetic tape and the same signal recording format for the magnetic tape, but two types of tape cassettes with different casing sizes and tape lengths. , that is, a standard full-size cassette (hereinafter referred to as "F cassette"),
Compact size cassette (hereinafter referred to as “C”) smaller than the standard
cassette).

By loading the C cassette into an adapter, it can be set into a VTR as a standard-sized cassette in the same way as the F cassette. However, since the use of an adapter is indispensable and inconvenient, development of VTRs that can record and play back both F cassette and C cassette sizes without using an adapter is progressing.

In this type of dual-use VTR, as shown in Figure 1, the main chassis (1) corresponds to both reels of the F cassette (7).
A supply reel stand (18) and a take-up reel stand (19) are provided on the top, and the C cassette (71) is mounted by engaging only the supply reel with the supply reel stand.

In order to pull out the magnetic tape from these tape cassettes and wrap it around the rotating head cylinder (16), as with conventional VTRs, there are a pair of magnetic tapes on both sides of the rotating head cylinder (16) on the main chassis (1). Guide groove (1
4) (15) and slidably engage leading guide blocks (21) and (22) with these guide grooves, respectively, to further form a tape running path via the capstan (17). A tape drawer lever (32) is equipped with a tape drawer post (31).

When loading the tape, use the leading guide block (2
1) (22) must wait at the initial position depending on the size of the tape cassette, and when pulling out the magnetic tape from the C cassette (71), it must wait at the most advanced position shown by the solid line in the figure. However, when pulling out the magnetic tape from the F cassette (7), it waits at the intermediate position shown by the two-dot chain line in the figure. Then, by the operation of the drive mechanism (not shown), both leading guide blocks (21) and (22) move to the loading completion position shown by the dashed line in the figure, and the magnetic tape (
72) is wrapped around the circumferential surface of the rotating head cylinder (16).

By the way, the V that can record and play only the conventional F cassette
In the TR, as shown in FIG. On both sides of the cassette (7), there are light receiving elements (51) at positions where light from the light emitting element (5) can enter.
(52) are arranged, and by detecting light from these light-receiving elements, it is possible to detect the state of the tape end when all of the magnetic tape in the F cassette (7) is wound onto the supply reel or take-up reel. ing.

(Problem to be Solved) However, if a detection device dedicated to each cassette is provided to detect the tape end of two types of cassettes, large and small, in the dual-use VTR, the device configuration will become complicated.

Therefore, the applicant developed an F cassette (
We considered adopting a method in which the tape end of the C cassette (71) is also detected at the same position as the light emitting element (5) when detecting the tape end in step 7).

The problem here is that if the light emitting element (5) is fixed at a fixed position on the chassis, when the C cassette (71) is installed, the magnetic tape inside the cassette will interfere with the light emitting element (5), causing the magnetic There is a risk that the tape may be damaged.

(Means for Solving the Problems) Therefore, in the present invention, a tape pull-out lever mechanism is provided for pulling out a magnetic tape from a tape cassette during tape loading and forming a tape running path via a capstan (17). The above problem was solved by making the tape end detection sensor movable in conjunction with the operation of the lever mechanism.

The tape type recording/reproducing device according to the present invention includes a lever mechanism (3) equipped with a tape pull-out post (31) for pulling out a magnetic tape from a tape cassette and forming a tape running path via a capstan (17). , the lever mechanism (
A movable arm (4) provided so as to be able to approach and separate from the rotating part of 3), a tape end detection sensor attached to the movable arm (4), and the sensor installed at a predetermined tape end detection position. It includes a stopper that prevents movement of the movable arm (4) in its posture, and a spring (42) that biases the movable arm (4) toward the stopper.

(Function) When a large-sized first tape cassette is placed in the cassette loading section, the tape pull-out post (31) of the lever mechanism (3) is placed in a standby position where the tape can be pulled out from the first tape cassette. In other words, the second tape cassette, which is smaller in size, is on standby at a position retreated toward the tape drawer side from the standby position when the second tape cassette is installed.

In this state, the movable arm (4) and the lever mechanism (3) are separated from each other without contacting each other. Along with this, the movable arm (4) is pressed against the stopper by the bias of the spring (42), and the tape end detection sensor on the movable arm (4) is capable of detecting the tape end with respect to the first tape cassette. installed in place.

Therefore, there is no problem in mounting the first tape cassette, and as a result, the tape end detection sensor enters, for example, a sensor hole formed in the casing of the first tape cassette.

On the other hand, when installing the second tape cassette, the tape drawer post (31) of the lever mechanism (3) moves forward from the tape drawer standby position relative to the first tape cassette to the reel stand side, and from the second tape cassette. Wait in a position where you can pull out the tape.

During the rotation of the tape drawer lever mechanism (3) to change the standby position, the rotating part of the lever mechanism (3) hits the movable arm (4), and then the lever reaches the standby position for the second tape cassette. The rotation of the mechanism drives the movable arm (4) against the spring (42) and causes it to move away from the stopper.

As a result, the tape end detection sensor on the movable arm (4) is installed at a position that is retreated toward the reel stand from the predetermined tape end detection position.

When a smaller second tape cassette is installed in this state, the tape in the cassette does not interfere with the tape end detection sensor, and there is no problem in installing the cassette.

After installing the cassette, with the operation of the lever mechanism (3),
The movable arm (4) is biased by a spring (42),
It rotates until it hits the stopper, and as a result, the sensor on the movable arm (4) is installed at a predetermined tape end detection position.

(Effects of the Invention) In the recording and reproducing apparatus according to the present invention, the tape end of two types of cassettes can be detected by a common sensor, and interference between the tape and the sensor is prevented when the cassette is installed. I can do it.

(Example) Hereinafter, the present invention will be explained using an F cassette (7) and a C cassette (71).
An example implemented in a VTR capable of recording and reproducing two types of information will be described in detail.

It should be noted that the examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

As shown in Fig. 1, the tape loading mechanism (2) installed on the main chassis (1) consists of a leading guide block (2) with tape leading posts (23) and (24) upright respectively.
21) (22), and these leading guide blocks are connected to the guide grooves (14) (
15) and are connected to a loading motor (both not shown) via a link mechanism to perform reciprocating drive along the guide groove.

When loading the tape, use the leading guide block (2
1) (22) waits at the most advanced position on the reel stand side shown by the solid line in the diagram when pulling out the magnetic tape from the C cassette (71), and when pulling out the magnetic tape from the F cassette (7) Inside, the rotary head moves back toward the cylinder side to the intermediate position shown by the two-dot chain line and waits.

In addition, the tape drawer lever mechanism (3) located on the right side of the tape loading mechanism (2) is connected to the C cassette (71).
A tape pull-out lever (32) is provided that can be rotated from the counterclockwise rotating end that enters the mounting part of the tape to the clockwise rotating end that opens toward the capstan (17). , a tape drawer post (31) is provided protrudingly.

As shown in FIG. 3, a sub-chassis (11) is fixed below the main chassis (1), and the tape pull-out lever (32) is attached to a support shaft (32a) protruding from the sub-chassis (11).
) is attached, the lever extending along the top surface of the main chassis (1). Tape drawer lever (32)
is biased in the opposite tape drawing direction by a torsion spring (37) fitted around the support shaft (32a). One end of the link (36) is connected to a pivot (36a) provided near the support shaft of the tape pull-out lever (32), and the other end of the link (36) has a round shaft-shaped cam follower (
38) is attached facing downward.

Further, a cam gear (33) is provided on the lower surface of the sub-chassis (11), and the cam follower (38) is engaged with a spiral cam groove (34) formed in the cam gear (33) as shown in FIG. It matches.

A support shaft (35a) protruding from the top surface of the subchassis (11)
A base end portion of a rotating lever (35) is attached to the cam follower (35), and a distal end portion of the rotating lever (35)
8).

Rotation from the loading motor is transmitted to the cam gear (33), and the counterclockwise rotation of the cam gear (33) causes the tape pull-out lever (32) to move from the rotational position shown by the solid line in FIG. It rotates clockwise through the intermediate position shown by the two-dot chain line to the tape drawing completion position shown by the one-dot chain line.

As shown in FIG.
0) is provided protrudingly, and the support shaft (40) has a tower body (
A movable arm (4) equipped with a tower body (53) is rotatably attached, and a light emitting element (5) is equipped at the upper end of the tower body (53). Further, a protrusion (41) is provided at the rotating end of the movable arm (4) on the opposite side of the tower body (53) to project downward, and the tip of the protrusion (41) is connected to the sub-chassis ( 11) into the cutout hole (12) with plenty of room.

The movable arm (4) is urged to rotate clockwise by a torsion spring (42) fitted around the support shaft (40).

As shown in FIG. 6, a cover part (54) is formed at the upper end of the tower body (53) to cover the light emitting element (5) from diagonally above the ring tape cassette side. The surface is processed into a smooth curved surface.

Note that the light emitting part of the light emitting element (5) is not covered by the cover part (54).

As shown in FIG. 1, on the main chassis (1), the light emitting elements (
Light receiving elements (51) and (52) for receiving light from the light emitting elements (5) are provided, and the light detection signals from the light emitting elements are connected to a system controller (not shown) and used to control the capstan motor and the like.

When installing the F cassette (7) on the main chassis (1) as shown in Figures 4 and 5, the leading guide blocks (21) (22) Slightly retreat from the most advanced position and move to the tape leading post (
23) (24) to the mouse part (75) of the F cassette (7)
(75) is installed at a standby position that can be accommodated within.

Further, the tape drawer lever (32) of the tape drawer lever mechanism (3) is in a standby position where the tape can be pulled out from the F cassette (7), that is, the tape drawer post (31).
is held in a standby position installed in the mouse section (75) on the right side of the F cassette (7).

In this state, the tape pull-out lever (32) is sufficiently far away from the movable arm (4), and the tower body (53) of the movable arm (4) and the tape pull-out lever (32) are not in contact with each other. Along with this, the movable arm (4) receives a clockwise rotational biasing force from the torsion spring (42), and the projecting piece (41) of the movable arm (4) moves inside the notch hole (12) that serves as a stopper. It is pressed against the periphery and rotation is prevented.

When installing the F cassette (7) in this state, the tower body (53) enters the center position of the sensor hole (77) of the cassette, and the light emitting element (5) on the tower body (53) is placed in a predetermined position. It will be set at the tape end detection position.

When loading the C cassette (71) as shown in FIGS. 2 and 3, the loading motor is started and the leading guide blocks (21) and (22) move into the guide grooves (14) and 1.
The tape leading post (2) is driven forward to the end of the tape leading post (2).
3) Insert (24) into the mouse part (76) of the C cassette (71).
Install it in a standby position that can be accommodated inside.

Further, the cam gear (33) constituting the tape drawer lever mechanism (3) is rotated clockwise from the position shown in Fig. 4 to the position shown in Fig. 2, and the accompanying movement of the cam groove (34) causes the tape drawer The lever (32) rotates counterclockwise. In this process, the tape pull-out lever (32) hits the tower body (53) of the movable arm (4), and further rotation of the tape pull-out lever (32) causes the movable arm (4) to move into the torsion spring (42). Rotate counterclockwise against the resistance.

As a result, in the C cassette (71) installation standby state shown in FIG. We will have to retreat. Therefore, C cassette (71
), when installing the magnetic tape (72) in the cassette.
There is no risk of interference with the tower body (53) or the light emitting element (5).

After the cassette is loaded, the loading motor is restarted, the leading guide blocks (21) and (22) are driven backward, the cam gear (33) is rotated counterclockwise, and the tape pull-out lever (32) is rotated. The magnetic tape (72) is pulled out by rotating clockwise. Further, as the tape pull-out lever (32) rotates, the movable arm (4) rotates clockwise due to the biasing force of the torsion spring (42), and the protruding piece (41) is cut out as shown in Fig. 4. The movable arm (4) stops when it hits the inner peripheral edge of the hole (12). At this time, the light emitting element (5) on the movable arm (4) is installed at a position where the tape end of the C cassette (71) is to be detected.

This position is the same as the tape end detection position of the F cassette (7).

Thereafter, the loading motor further rotates, and tape loading by the leading guide blocks (21, 22) and tape tensioning by the tape pull-out lever (32) are continued.

After tape loading is completed, when the magnetic tape is wound up to the tape end in play mode or tape rewind mode, the light emitted from the light emitting element (5) passes through the transparent part of the magnetic tape. photodetector (51
) or (52), whereby the tape end is immediately detected.

In the above VTR, regardless of the type of tape cassette set, a common light emitting element (5
) can detect the tape end.

In addition, as shown in Fig. 6, since a cover part (54) is formed on the tower body (53), when the C cassette is installed, the magnetic tape (72) inside the cassette will be moved to the reel side by the action of static electricity, etc. Even if the magnetic tape (7
2) slides down on the surface of the cover part (54), so
There is no risk that the magnetic tape (72) will become entangled with the tower body (53).

The above description of the embodiments is for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims. Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the tape loading mechanism and tape pull-out lever mechanism of a VTR according to the present invention, and FIG. 2 is a C
FIG. 3 is a partially cutaway side view of the same as above; FIG. 4 is a plan view corresponding to FIG. 2 when the F cassette is installed; FIG. 5 6 is a partially cutaway side view of the same as above, and FIG. 6 is a perspective view showing a part of the cover formed on the tower body. (21) (23)... Leading guide block (32)
... Tape drawer (4) ... Movable arm (5) ... Light emitting element (7) ... F cassette lever (42) ... Spring (51) (52) ... Light receiving element (71 )...C cassette

Claims (1)

[Claims] [1] A mounting part for the first tape cassette with a large casing size is provided across the pair of reel stands (18) and (19) on the chassis, and a tape cassette with a small casing size is stacked inside the mounting part. In a tape type recording and reproducing device which is provided with a second tape cassette loading section and is capable of recording or reproducing information on or from the two types of tape cassettes, the magnetic tape is pulled out from the tape cassette and the tape is run via a capstan (17). A lever mechanism (3) equipped with a tape drawer post (31) for forming a path, and a movable arm (4) that is movable toward and away from the lever mechanism (3).
, a tape end detection sensor mounted on the movable arm (4), a stopper that should prevent the movable arm (4) from moving when the sensor is installed at a predetermined tape end detection position, and ) toward the stopper, and the movable arm (4) hits the lever mechanism (3) in the standby position to start drawing out the tape from the second tape cassette, and the movable arm (4) moves away from the stopper. A tape type recording/reproducing apparatus, which is held at a remote position, and a sensor on the movable arm (4) is installed at a position retreated toward the reel stand side from the predetermined tape end detection position.