JPH0196856A - Tape guide device - Google Patents

Abstract

PURPOSE:To securely guide a tape, which is issued out from the front surface opening part of a tape cassette, to the circumferential surface side of a rotary head drum by providing a tape guiding member above the rotary head drum in the direction of a tape cassette cover freely press-movably when the cover is opened. CONSTITUTION:When a tape cassette 40 is inserted into a cassette holder 20 and the cassette 40 is fitted to a pair of reel bases and a positioning pin on a linear skate chassis 7, while the cassette 40 is fitted, a cover 41 of the cassette 40 is started to open by a pin 18 at a vertical rising piece part 7b of the chassis 7. By the cover 41 to open, a tip part 34b of a tape guiding arm 34 is slightly turned to the central side of a rotary head drum 3. Since a tape T is loosened, which is positioned between a pair of front surface opening parts 42 of the cassette 40 opened by the opening of the cover 41, the tip part 34b of the arm 34 is made into a wall to prevent the tape T from issuing out abruptly, and the tape T is securely guided between a circumferential surface 3a of the drum 3 and the cassette 40.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for preventing the tape from riding on the rotating head drum when a tape cassette is installed in a video tape recorder (VTR), for example. The present invention relates to a tape guide device that guides the tape toward the peripheral surface of the tape.

[Summary of the Invention] The present invention provides for a tape cassette to be installed in, for example, a VTR, with its lid disposed close to the peripheral surface of a rotary head drum in an open state, and the tape cassette opened by the lid in its open state. In a tape guiding device that guides the tape exposed from the front opening of the cassette to the peripheral surface of the rotary head drum before tape loading to prevent it from riding on the rotary head drum. A tape guide member for guiding the tape to the circumferential surface of the rotary head drum when the lid of the tape cassette is opened is provided above so as to be freely pushable in the direction of the lid. At times, the tape guide member provided on the lid side so as to be freely pushed can reliably guide the tape in the tape cassette so as to knock it down onto the circumferential surface of the rotating head drum. This system reliably prevents the tape from running aground, thereby further stabilizing tape loading.

[Prior art] For example, a VTR that uses a tape cassette with a lid
In this method, when a tape cassette is installed, the tape exposed through the front opening opened by the opened lid of the tape cassette is guided to the circumferential side of the rotating head drum so as not to run over it. A tape guide device as shown in Japanese Patent No. 57-87363 is attached. To explain this in detail with reference to FIGS. 8 to 1O, 50 is a chassis disposed inside the VTR body;
A helical scan type rotary head drum 51 is provided on this chassis 50, and a positioning bin 53 for positioning the tape cassette 52 when it is installed is provided protrudingly. Further, the rotary head drum 5 on the chassis 50
A pair of tape guides 54 and 54 are erected near the peripheral surface 51a of the rotary head drum 51 between the positioning pin 53 and the positioning pin 53. On this pair of tape guides 54.54,
The tape guide device 55 is attached. This tape guide device 55 is composed of a pair of tape sliding guides 56 and 57 fixed to the pair of tape guides 54 and 54, and each upper portion is provided with a tape T in the tape cassette 52. Slanted surfaces 56a and 57a are formed to guide the pair of front openings 52a and 52a, respectively. still,
A pair of front openings 52a, 52 of the tape cassette 52
A is normally closed by a lid 58, and when the tape cassette 52 is attached to the VTR body, the lid 58 is opened upward by a lever 59 provided upright on the chassis 50, as shown in FIG. It is now open to the public.

As a result, the tape T between the pair of front openings 52a and 52a becomes loose due to vibration or falling of the tape cassette 52, and is pressed against the inner surface of the lid body 58 by its own elasticity. Become. In this state, as shown in FIG. 9, the tape cassette 52 is attached (lowered) to the VTR body.
Then, during the installation, the tape cassette 5
At the same time as the second lid 58 opens to some extent, the eighth tape T opens.
As shown by T in the figure, there is a case where the object jumps forward on the rotary head drum 51 and tries to ride on the rotary head drum 51. At this time, the tape T that was opened by the lid 58 of the tape cassette 52 and unexpectedly jumped out was moved by the inclined surfaces 56a and 57a of the pair of tape sliding guides 56 and 57, as shown by the arrow in FIG. 1O. The tape is pushed back between the pair of tape guides 54, 54 and the tape cassette 52 and slid off.

[Interlayer points that the invention attempts to solve] However, as VTR bodies become smaller, lighter, and thinner,
The distance e between the rotating head drum 51 and the tape cassette 52 when installed is shortened, and the tape cassette 52 is damaged due to a defect in the roll lock mechanism within the tape cassette 52.
Since it is not possible to reliably prevent the tape T from loosening when vibrations, drops, etc. If the tape protrudes beyond the body 56, 57 and extends above the rotary head drum 51, the tape guide device 55 cannot sufficiently deal with the problem, which may cause problems such as tape loading after the tape cassette is attached. points are pointed out.

SUMMARY OF THE INVENTION Therefore, the present invention has been developed to ensure that, when the lid of a tape cassette is opened, the tape that unexpectedly pops out from the front opening of the tape cassette, which is opened by the lid in the open state, is guided to the peripheral surface of the rotating head drum. The present invention provides a tape guiding device that can perform the following steps.

[Means for solving the problem] The lid of the tape cassette is placed close to the peripheral surface of the rotary head drum in an open state, and the front opening of the tape cassette is opened by the lid in the open state. Remove the exposed tape.
In the tape guide device that guides the tape to the circumferential surface of the rotary head drum to prevent the tape from riding on the rotary head drum, the tape guide device includes a tape guide device that guides the tape to the circumferential surface of the rotary head drum to prevent the tape from riding on the rotary head drum. A tape guide member for guiding the tape is provided on the surface so as to be freely pushable toward the lid body.

[Function] Even if the lid of the tape cassette opens near the top of the rotating head drum and the tape accidentally jumps out onto the rotating head drum from the front opening of the tape cassette opened by the opened lid, the rotating head A tape guide member provided above the drum on the side of the lid allows the tape that unexpectedly pops out to be guided so as to be blown off to the circumferential surface of the rotary head drum. This results in
Since the tape is reliably prevented from running onto the rotating head drum during the tape cassette installation, tape loading after the tape cassette installation is also performed reliably and stably.

[Example] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a camera-integrated 8 mm VTR, and a chassis 2 is disposed on one side of the main body. The bottom side of the main body on the shear 2 has a convex portion 2a, and a helical scan type rotary head drum 3 is provided on this convex portion 2a. Further, at a position along the circumferential surface 3a of the rotary head drum 3 of the convex portion 2a, a pair of substantially arc-shaped guide grooves 2b forming part of the guide rail are provided.
, 2c is formed. Furthermore, a capstan 4 and a supply-side guide roller 5 are rotatably supported at the front and rear of the main body side of the chassis 2 so as to sandwich the rotary head drum 3.

Further, as shown in FIGS. 1 and 6-7, a linear skate chassis 7 is mounted on the chassis 2 via four support pins 6, .
It is arranged so that it can freely move back and forth with respect to a by a drive mechanism (not shown). On this linear skate chassis 7, a pair of reel stands 8, 8 are rotatably supported, and
A pair of positioning pins 9.9 are provided protrudingly for positioning a tape cassette 40, which will be described later, when it is installed. Furthermore, a pair of guide rails 14 and 15 for moving a pair of left and right sliders 12 and 13 having a pull-out guide 10 and an inclined guide 11 are fixed to a position of the linear skate chassis 7 near the rotary head drum 3. . The pair of sliders 12, 13 are reciprocated while sliding on the pair of guide rails 14, 1.5 and the pair of guide grooves 2b, 2c by a drive mechanism consisting of a loading ring 16 and the like. It looks like this. In addition, a tape cassette 4 is installed on the capstan 4 side on the linear skate chassis 7.
It rotatably supports a pinch roller 17 that presses against the capstan 4 and rotates when the tape T in the tape runs.

In addition, both vertical upright pieces 7 of the linear skate chassis 7
A pin 18 for opening the lid 41 of the tape cassette 40 is attached to the vertical upright piece 7b on the guide roller 5 side of a and 7b.
It is installed protrudingly.

Further, both vertical standing pieces 19a stand vertically at both ends of the chassis 2 on the capstan 4 and guide roller 5 sides.
, 19b, a rotatable cassette holder 20 holds the tape cassette 40 and attaches the tape cassette 40 to a pair of reel stands 8.8 and a pair of positioning pins 9.9 on the linear skate chassis 7. I support it.

That is, this cassette holder 20 has a pair of legs 21a.
, 21b are both vertical upright pieces 19a, 1 of the chassis 2.
The outer holder 21 is supported by a pin at each of the outer holders 9b and is always urged to open upwardly in FIG. 1 by each search coil spring 22.
A pair of legs 23a and 23b are supported by pins on both vertical upright pieces i7a and 7b of the linear skate chassis 7, respectively, and the rotary head drum is mounted together with the linear skate chassis 7 with the tape cassette 40 attached. 3, and an inner holder 23 that moves back and forth relative to the inner holder 23.

Thus, when the tape cassette 40 is installed from the vertical upright piece 19b near the guide roller 5 of the chassis 2 to the upper side of the rotary head drum 3, the tape T is securely placed on the circumferential surface 3a side of the rotary head drum 3. A tape guiding device 30 is provided for guiding the tape. To be more specific, this tape guide device 30 has a metal plate-like base plate 31 which is arranged on the guide roller 5 and has a substantially V-shaped planar shape.

This base plate 31 has a stepped portion 31 formed on one end side.
a and 31b are the vertical upright pieces of the Nyashi 2! It is fixed to the upper end of 9b with a plurality of screws 32, and the shaft 33
The other end of the rotary head drum 3 is located above the periphery of the rotary head drum 3 near the cassette holder 20. Further, on the lower end side of the base plate 31 in FIG. 3, a hanging piece portion 31c extending vertically downward is formed by bending. This hanging piece 31c is placed on the convex portion 2a of the chassis 2 to maintain the horizontality of the base plate 3. Furthermore, the base plate 31 has an upright piece 31d in the center thereof, and forms a substantially U-shaped hole 31e into which the upper end of the guide roller 5 is inserted. An arcuate hole 31f is formed between the two.

A base 34 of a tape guide arm 34 made of synthetic resin as a tape guide member is attached to the shaft 33 of the base plate 31.
A is prevented from being removed by a stop washer 35 that is locked to the upper end of the shaft 33, and is rotatably supported. The tip end 34b of the tape guide arm 34 has elasticity and is perpendicular to the base 34a, forming a curved surface and hanging down to the upper side of the periphery of the rotary head drum 3. Also,
A coil spring 36 as an elastic member is interposed between the base end 34c of the tape guide arm 34 and the upright piece 31d of the base plate 31. Due to the tensile force of the coil spring 36, the tip end 34b of the tape guide arm 34 is moved toward the cassette holder 20 from above the rotary head drum 3.
It is always urged to rotate to the side.

Note that the base portion 34a and the base end portion 34c of the tape guide arm 34
A pin portion 34d that engages with the arc-shaped hole 31r of the base plate 3I is integrally formed on the lower surface between the tape guide arms 34 and restricts the range of rotation of the tape guide arm 34 to a certain amount. Further, a pair of front openings 42 and 42 are formed at the front of the tape cassette 40 to expose the tape T when the lid 41 is opened.

According to the tape guide device 30 of the embodiment described above, when the cassette holder 20 of the camera-integrated 8 mm VTR 1 is opened, the tip 34b of the tape guide arm 34 moves around the rotating head drum 3 as shown in FIG. It is pressed and biased slightly outward from above the surface 3a. Then, when the tape cassette 40 is inserted into the cassette holder 20, the tip end 34b of the tape guide arm 34 is pushed by the lid 41 of the tape cassette 40, and the rotary head drum 3
rotates to above the circumferential surface 3a. From this state, when the cassette holder 20 is closed and the tape cassette 40 is installed on the pair of reel stands 8.8 and the positioning bin 9.9 on the linear skate chassis 7, during the installation,
As shown in FIG.
It starts to open by 8. The opening of the lid 41 causes the tip 34b of the tape guide arm 34 to rotate slightly toward the center of the rotary head drum 3. Tape T+ between parts 42 and 42: Looseness has occurred,
Even if this tape T suddenly tries to jump out onto the rotary head drum 3 at the same time as the lid body 41 opens a little, the tip 34b of the tape guide arm 34 located on the rotary head drum 3 acts as a wall and the rotary head When the lid 41 of the tape cassette 40 is fully opened without going over the drum 3, the tip 34b of the tape guide arm 34 returns to its original position as shown in FIG. The tape T that suddenly jumps out and rides, for example, on the periphery of the rotary head drum 3 is attached to the tip 34b of the tape guide arm 34.
As a result, the tape is reliably guided so as to be thrown between the circumferential surface 3a of the rotary head drum 3 and the tape cassette 40.

After the installation of the tape cassette 40 is completed, the linear skate chassis 7 moves forward by a predetermined stroke toward the rotary head drum 3, and the tape T is moved to the drawer guide 10 on the pair of sliders 12 and 13 as shown in 5th rgJ. The tape is loaded onto the tape running system by the inclined guide 11, but since the tape T is reliably prevented from running onto the rotating head drum 3, the tape loading after the tape cassette is installed is also reliable and stable. You can do it by doing this. After this tape loading is completed, the tip portion 34b of the tape guide arm 34 is in the fifth position.
As shown in the figure, the open lid 4I of the tape cassette 40 rotates toward the center of the rotary head drum 3 against the biasing force of the coil spring 36.

As described above, when the tape cassette 40 is installed, the tip end 34b of the tape guide arm 34 is attached to the tape cassette 40.
Since it is pushed by the lid 41 of the tape cassette 40 and escapes toward the center of the rotary head drum 3, it does not interfere with the opening/closing movement of the lid 41 of the tape cassette 40. Further, after the installation of the tape cassette 4o is completed, the tip portion 34b of the tape guide arm 34 moves the tape T that has climbed onto the rotary head drum 3 between the peripheral surface 3a of the rotary head drum 3 and the front portion of the tape cassette 40. Rotate enough stroke to knock it off. As a result, the space between the rotary head drum 3 and the tape cassette 40 when the tape cassette 40 is attached can be made as narrow as possible, so that the VTR main body can be further reduced in size and weight.

In the above embodiment, the tape guide device is applied to a camera-integrated 8 mm VTR, but the present invention is not limited to this and can of course be applied to general VTRs. Also,
Although a coil spring is used as the elastic member for biasing the tape guide arm toward the tape cassette, the present invention is not limited to this, and a plate spring or the like may be used.

[Effects of the Invention] As described above, according to the present invention, a tape guide member is provided above the rotary head drum to guide the tape to the circumferential surface of the rotary head drum when the lid of the tape cassette is opened. Since it is provided so that it can be pushed freely, when the lid of the tape cassette is opened, the exposed tape that unexpectedly pops out from the front opening of the tape cassette opened by the lid in the open state is prevented from hitting the circumferential surface of the rotating head drum. Guidance can be provided smoothly and reliably. Therefore, it is possible to reliably prevent the tape from riding on the rotating head drum, and
Tape loading can be made more stable and reliable.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tape guide device showing an embodiment of the present invention during installation of a tape cassette, FIG. 2 is a front view of the same, FIG. 3 is an enlarged plan view of the same, and FIG. 4 is a state in which the tape cassette has been installed. 5 is a schematic plan view when tape loading is completed, FIG. 6 is a schematic side view when the tape cassette is installed, FIG. 7 is a schematic side view when tape loading is completed,
FIG. 8 is a plan view of a conventional tape guide device, FIG. 9 is a side view showing a conventional tape cassette being installed in the middle, and FIG. 10 is a side view showing a conventional tape cassette after installation is completed. It is. 3...Rotating head drum, 3a...Surrounding surface, 3o...
- Tape guide device, 34... Tape guide arm (tape guide member), 40... Tape cassette, 41...
Lid body, 42...front opening, T...tape. Fig. 6 Difflow power is closed #f 晧4ff of Btan! 1st page Rayo Figure 7 Figure 9 Figure 1O Procedural Amendment (Uro)

Claims (1)

[Scope of Claims] The lid of the tape cassette is disposed close to the circumferential surface of the rotating head drum in an open state, and the tape exposed from the front opening of the tape cassette opened by the lid in the open state. ,
In the tape guide device that guides the tape to the circumferential side of the rotary head drum to prevent it from riding on the rotary head drum, the tape guide device includes a tape guide device that guides the tape to the circumferential surface of the rotary head drum so as to prevent the tape from riding on the rotary head drum. A tape guiding device characterized in that a tape guiding member for guiding the tape is provided on a surface so as to be freely pushable toward the lid body.