JPH01273260A - Method and device for guiding tape - Google Patents

Abstract

PURPOSE:To certainly prevent the jamming of a tape when the tape is loaded so as to stabilize the tape loading by moving a projection on a head drum when the tape runs on the head drum when the cassette of the tape is loaded. CONSTITUTION:A projection 30 constituting a tape guiding device which shakes down a tape T running on a rotary head rum 3 when the tape cassette 40 of the tape T is loaded over from a recessed part 3b on the upper surface of the drum 3 to the outer margin 3c of the upper surface to the peripheral surface 3a side of the drum 3 is fixed with a screw 31. When the drum 3 is rotated in the direction opposite to the reproducing direction while a take-up reel 8a is rotated in the taking-up direction, the projection 30 shakes down the tape T running on the drum 3 and, at the same time, a take-up reel 43 takes up the excessive tape T coming out of the cassette and running on the drum. Thus the tape T is housed in the cassette 40.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for installing a tape cassette into a so-called helical scan type video tape recorder (VTR).
The present invention relates to a tape guiding method and apparatus for guiding a tape that has run onto the inclined rotary head drum to the circumferential surface of the rotary head drum.

[Summary of the Invention] The present invention is directed to a so-called helical scan system in which the lid of a tape cassette is mounted close to the circumferential surface of a rotating head drum in an open state, and the front surface of the tape cassette opened by the lid in the open state. A tape guiding method and device for guiding the tape exposed through the opening and riding on the rotary head drum to the circumferential surface of the rotary head drum before loading the tape, wherein a lid of the tape when the tape cassette is installed is provided. When the tape is placed on the rotating head drum by the opening action of the body, the rotating head drum is rotated in a predetermined direction and the protrusion provided on the top of the tape is moved. The tape that rides on the rotating head drum when the body is opened can be reliably brushed off to the circumferential surface of the rotating head drum, thereby reliably preventing tape jamming during tape loading and stabilizing tape loading. This makes it possible to achieve even greater goals.

[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. 7 to 9, reference numeral 50 is a chassis disposed within the VTR main body, and on this chassis 50 is provided a rotating hent drum 51 of a helical scan type. A positioning bin 53 is provided protrudingly for positioning the tape cassette 52 during installation. Also, the rotating 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 5I between the positioning pin 53 and the positioning pin 53.

A tape guide device 55 is mounted on the pair of tape guides 54,54. This tape guide device 55 is composed of a pair of tape sliding guides 56 and 57 fixed on the pair of tape guides 54 and 54, each of which has a tape T in the tape cassette 52 on its upper part. Slanted surface 5 guiding toward the pair of moe-face opening portions 52a, 52a side
6a and 57a are formed respectively. Note that the pair of front openings 52a, 52a of the tape cassette 52 are normally closed by a lid 58, and the tape cassette 5
2 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.

Therefore, the tape cassette 52 may vibrate or fall.

Due to static electricity or the like, the pair of front openings 52a, 52a
The tape T in between becomes loose and pressed against the inner surface of the lid body 58 by its own elasticity (rigidity). In this state, as shown in FIG. 8, when the tape cassette 52 is loaded (lowered) into the VTR main body, the lid 58 of the tape cassette 52 opens to some extent during the loading process, and at the same time the tape T As shown at T1 in FIG. 7, 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 'r, which was opened by the lid 58 of the tape cassette 52 and unexpectedly jumped out, fell onto the inclined surface 56a of the pair of tape sliding guides 56 and 57, as shown by the arrows in FIG.
, 57a, it is pushed back between the pair of tape guides 54, 54 and the tape cassette 52, and is slid down.

[Problems to be solved by the invention] However, as VTR bodies become smaller, lighter and thinner,
The distance Q 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 reel locking mechanism within the tape cassette 52.
Since it is not possible to reliably prevent the tape T from sagging when vibrations, drops, etc. are applied to the Rotating head drum 51 beyond sliding guide body 56,57
It has been pointed out that if the tape protrudes upward for a long time, the tape guide device 55 cannot sufficiently deal with the problem, causing trouble in tape loading after the tape cassette is attached.

Therefore, the present invention aims to remove the tape that unexpectedly jumps out from the front opening of the tape cassette opened by the opened lid and rides onto the rotating head drum when the lid of the tape cassette is opened. The purpose of the present invention is to provide a tape guiding method and device that allows the tape to be swept off the peripheral surface.

[Means for solving the problem] When the lid of a tape cassette is mounted in an open state close to the peripheral surface of a rotating head drum that is inclined at a predetermined angle with respect to the chassis, the lid in an open state opens the tape cassette. The tape exposed from the front opening of the tape cassette and riding on the rotary head drum is brushed off onto the circumferential surface of the rotary head drum by the protrusion on the upper part of the rotary head drum by rotating the rotary head drum. At the top of this rotating head drum,
A protrusion is provided on the circumferential surface of the rotating head drum for brushing off the tape.

[Function] Even if the lid of the tape cassette opens near the top of the rotating head drum, and the tape unexpectedly jumps out onto the rotating head drum from the front opening of the tape cassette opened by the opened lid and runs onto the rotating head drum, By rotating the rotary head drum and moving the protrusion on its upper part in the direction of brushing off the tape cassette, the tape that has ridden on the rotary head drum is thrown off to the circumferential surface of the rotary head drum. As a result, the tape that rides on the rotating head drum when the tape cassette is loaded is brushed off, thereby reliably preventing tape jamming during tape loading.

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

In FIG. 1, reference numeral l designates a camera-integrated 8 mm VTR used in the tape guiding method of the present invention, and a chassis 2 is disposed on one side of the main body. The bottom side of the main body on this chassis 2 is formed into a convex portion 2a, and a helical scan type rotary head drum 3 is formed on this convex portion 2a.
This is provided.

Further, a pair of substantially arcuate guide grooves 2b and 2c, which form part of a guide rail, are formed at positions along the circumferential surface 3a of the rotary head drum 3 of the convex portion 2a. 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 FIG. 1.5, on the chassis 2, a linear skate gloss shifter is connected to the circumferential surface 3a of the rotary head drum 3 via four support pins 6, . It is arranged so that it can be moved back and forth by a drive mechanism (not shown). A pair of positioning pins 9.9 are provided on the linear skate chassis 7 to rotatably support a pair of reel stands 8a and 8b, and also to position a tape cassette 40, which will be described later, when installed. It is. Furthermore, a pair of guide rails 14.15 for moving a pair of left and right sliders +2.13 having a pull-out guide 10 and an inclined guide II are fixed to a position of the linear skate chassis 7 near the rotary head drum 3. . This pair of sliders
2 and 13 are loading rings! 6 and the like on the pair of guide rails 14.15 and the pair of guide grooves 2b.

It moves back and forth while sliding on 2c.

A pinch roller 17 is rotatably supported on the capstan 4 side of the linear skate chassis 7, and rotates by pressing against the capstan 4 when the tape T in the tape cassette 40 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 pair of reel stands 8a, 8 on the linear skate chassis 7 that hold the tape cassette 40.
The cassette boulder 20 on which the tape cassette 40 is mounted is rotatably supported by a pair of positioning pins 9 and 9. That is, this cassette holder 20 has a pair of legs 21a and 2ib supported by pins on both vertical upright pieces 19a and 19b of the chassis 2, respectively, and is always biased upward in FIG. 1 by a torsion coil spring 22. The outer holder 21 and the pair of legs 23a and 23b are both vertical upright pieces 7a of the linear skate chassis 7.

7b, the tape cassette 4 is
The inner holder 23 is configured to reciprocate with the linear skate chassis 7 with respect to the rotary head drum 3 in a state in which the roller holder 0 is attached.

Thus, the tape T that has ridden on the rotary head drum 3 when the tape cassette 40 is installed is brushed off from the recess 3b on the upper surface of the rotary head drum 3 to the outer edge 3C of the upper surface toward the circumferential surface 3a of the rotary head drum 3. A protrusion 30 constituting the guide device is fixed with screws 31. To be more specific, as shown in FIG. 2, this protrusion 30 is formed into a plate shape from synthetic resin, and its tip 30a slightly protrudes from the outer edge 3C of the upper surface of the rotary head drum 3 (
The base portion 30b is fixed to the four portions 3b of the rotary head drum 3 with the screws 31 so that the rotational head drum 3 is approximately 1llIll).

Further, a pair of front openings 42, 42 are formed at the front of the tape cassette 40 to expose the tape T when the lid 41 is in an open state.

Note that 43 is a take-up reel, and 44 is a supply reel.

According to the above embodiment, the camera-integrated 8mm VT I'
j Insert the tape cassette 40 into the cassette holder 20 of I, close the cassette holder 20, and attach the tape cassette 40 to the pair of reel stands 8a, 8b and positioning pins 9.9 on the linear skate shaft. When it is installed, as shown in FIG.
It begins to open by the pin 18 of the vertical upright piece 7b. If the tape T between the pair of front openings 42 and 42 of the tape cassette 40 opened by the opening movement of the lid 41 is loosened, or due to static electricity generated in the lid 41, etc., the lid 41 opens slightly. At the same time, the tape T is rotated by the rotating head drum 3.
As shown in FIG. 3, the lid 41 suddenly pops out.
There are cases where the tape cassette 40 is mounted in a state where it rides on the rotating head drum 3 when the tape cassette 40 is fully opened.

In this case, as shown in FIG. 4, while rotating the take-up reel stand 8a in the take-up direction, the rotary head drum 3 is moved in the direction of the arrow in the figure (the opposite direction to the rotation direction during playback).
By rotating the tape T, the protrusion 30 knocks off the tape T that has ridden on the rotary head drum 3, and the take-up reel 43 winds up the tape T that has protruded and rested on the rotary head drum 3, and the tape cassette 40
Store inside. As a result, the tape cassette 40 is mounted at a predetermined position on the chassis 3 with the tape T being located at a proper predetermined position (near the peripheral surface 3a of the rotary head drum 3).

Note that the reel stand 8a for winding is in a free state with no brake applied when the tape cassette 40 is installed, so the tape T is
When the leader tape is at the top or end, the overflowing tape T is wound up. 8b
The overflowing tape T may be wound up by rotating the side. Further, after rotating the rotary head drum 3 to shake off the tape T from the top of the rotary head drum 3, the take-up reel 43 (or the supply reel 4
The tape T may be wound up according to 4), and the rotating direction of the rotary head drum 3 may be opposite to the aforementioned rotating direction.

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 from the position shown in FIG. 10 and the inclined guide 11, the tape T is loaded onto the tape running system, but the tape T that rides on the rotating head drum 3 when the tape cassette 40 is installed is blown away by the protrusion 30 as described above. Take-up reel 43
Since the tape is wound at a proper position in the tape cassette 40, there is no jamming of the tape during tape loading, and tape loading is performed in a stable state.

As mentioned above, the protrusion 30 attached to the upper part of the rotary head drum 3 protrudes only slightly from the outer edge 3c of the upper surface thereof, so that it does not interfere with the tape running system during reproduction or the like. Further, if there is a space of about 1IllIIl on the rotating head drum 3, the protrusion 30 can be attached and space can be saved.
Since the protrusion 30 is also a resin molded product, it is low cost and ■
It can contribute to reducing the size and weight of the 'rR main body.

In the above embodiment, the tape guiding method and its device were applied to an 8 mm VTR with an integrated camera, but the present invention is not limited to this and can of course be applied to general VTRs.

Further, the protrusion 30 for brushing off the tape T of the rotary head drum 3 was formed in a temporary shape of synthetic resin and was attached to the upper part of the rotary head drum 3 with three screws, but the invention is not limited to this.
As shown in FIG. 5, a protrusion 32 may be integrally formed on a part of the outer peripheral edge of the upper surface of the rotary head drum 3. As shown in FIG.

[Effects of the Invention] As described above, according to the present invention, when the tape rides on the rotating head drum due to the opening operation of the lid when a tape cassette is attached, the rotating head drum is rotated in a predetermined direction and the upper part of the tape cassette is rotated in a predetermined direction. By moving the protrusion provided on the tape cassette, tape that has ridden on the rotary head drum when the lid of the tape cassette is opened can be brushed off onto the circumferential surface of the rotary head drum. This results in
It is possible to reliably prevent tape jamming during tape loading and further stabilize tape loading.

[Brief explanation of the drawing]

Fig. 3 is a perspective view of a tape guide device showing an embodiment of the present invention during installation of a tape cassette; 5 is a schematic side view when the tape cassette is installed, FIG. 6 is a perspective view of another embodiment, and FIG. 7 is a plan view of a conventional tape guide device. FIG. 8 is a side view showing a state in which a conventional tape cassette is being installed, and FIG. 9 is a side view showing a state after completion of installing a conventional tape cassette. 2... Chassis, 3... Rotating head drum, 3a.
...Surrounding surface, 30.32...Protrusion, 40...Tape cassette, 4T...Lid body, 42...Front opening, T...
·tape. Figure 5

Claims (2)

[Claims] (1) When the lid of a tape cassette is mounted in an open state close to the peripheral surface of a rotating head drum that is inclined at a predetermined angle with respect to the chassis, the front opening of the tape cassette is opened by the lid in an open state. A tape guiding method characterized in that the tape that is exposed from a portion of the rotary head drum and rides on the rotary head drum is brushed off onto the circumferential surface of the rotary head drum by a protrusion on the upper part of the rotary head drum by rotating the rotary head drum. . (2) The lid of the tape cassette is disposed close to the peripheral surface of the rotating head drum that is inclined at a predetermined angle with respect to the chassis, and the front opening of the tape cassette is opened by the lid in the open state. A tape guiding device that guides the tape that has been exposed from the rotary head drum and has ridden on the rotary head drum to the circumferential surface of the rotary head drum, the tape is swept onto the circumferential surface of the rotary head drum onto the upper part of the rotary head drum. A tape guide device characterized by being provided with a protrusion for dropping.