JPH0755705Y2 - Gear mounting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention can easily and effectively pivot a loading gear attached to the outer surface of a side plate of a cassette loading device, for example, without causing tilting. Regarding the gear mounting mechanism.

2. Description of the Related Art A cassette loading device provided in a VTR (Video Tape Recorder) or the like has a guide protrusion formed, for example, on a side plate of a tape cassette holder in an L-shaped guide groove formed on the side plate of the device. It is installed by inserting this guide protrusion L
It is configured to move the cassette holder from the unloading position to the loading position and vice versa by moving the cassette holder along the character-shaped guide groove. The movement of the guide protrusion along the L-shaped guide groove is performed by, for example, engaging the guide protrusion with a loading gear rotatably supported on the outer surface of the side plate through an engaging member, and driving the loading gear. It is performed by rotating in an angle range smaller than 180 °.

(Problems to be Solved by the Invention) The loading gear is provided in a relationship to engage with the guide protrusion through the engagement member, but is usually provided at a position so as to cover a part of the L-shaped guide groove. Therefore, it is necessary to provide a sufficient space between the loading gear and the side plate of the cassette loading device so that the guide protrusion can pass through. For this reason, the supporting shaft of the loading gear becomes long, and the supporting shaft has a structure in which the supporting shaft easily tilts.

By the way, when the supporting shaft of the loading gear is tilted, the axial distance between the loading gear and the mating gear that meshes with it changes, so that the rotational force of the motor is not transmitted smoothly to the guide protrusions, and cassette loading and unloading There was a problem that it hindered the operation.

The present invention has been made in view of the above circumstances, and an object thereof is to support a loading gear supporting shaft that must be attached to a side plate of a cassette loading device provided in a VTR or the like with a sufficient space between the side plate and the side plate. It is an object of the present invention to provide a gear mounting mechanism that enables the transmission of a rotational force by preventing the inclination of the support shaft, suppressing the variation in the distance between the shaft and the mating gear, and enabling the smooth transmission of the rotational force.

(Means for Solving the Problems) The present invention provides a gear mounting device that is rotatable on a substrate within an angle range of less than 180 °, and that mounts a gear with a predetermined gap formed between the substrate and the substrate. According to the mechanism, the board is provided with a circular opening circumferentially divided by a plurality of radial support pieces, and the intersection of the radial support pieces is projected toward the gear mounting surface side of the board. A support hole for axially supporting the gear is provided at an intersecting portion, and a support shaft rotatably fitted in the support hole is provided on one surface of the gear, and the support shaft is fitted when the support shaft is fitted in the support hole. A plurality of engaging hooks that engage with the circular arc edge of the circular opening, and a plurality of anti-tilt legs that closely oppose the peripheral portion of the circular opening of the substrate at the time of the above fitting are provided. .

(Operation) Since the support shaft of the gear is supported by the support holes provided at the intersections of the plurality of radial support pieces protruding to the outer surface side of the substrate, the support shaft can be shortened and the inclination of the support shaft can be increased. Can be suppressed.

Moreover, since the plurality of anti-tilt legs provided on the gear are closely opposed to the board and the engaging hooks are engaged with the arc edge of the opening, the surface wobbling of the gear, that is, the inclination of the support shaft is ensured. This can be prevented, and smooth transmission of the rotational force to the gear can be performed.

(Embodiment) A gear mounting mechanism according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a cassette loading device of a VTR to which the present invention is applied.

This apparatus 1 includes a tape cassette (not shown) inserted and loaded in the tape cassette holder 2 together with the tape cassette holder 2, and an unloading position (non-attached position) where the tape cassette is inserted into and removed from the cassette holder 2. position)
And the tape cassette is mounted on the reel shaft and is transferred between a loading position (mounting position) for recording and reproduction. The loading operation by the movement of the cassette holder 2 is activated by inserting the tape cassette into the tape cassette 2 at a predetermined position, and the unloading operation is activated by the operation of an eject operation body (not shown).

The tape cassette holder 2 is mounted between the pair of left and right side plates (substrates) 3 of the cassette loading mechanism 1 so as to be slidable in the front-rear direction and the up-down direction.

That is, the tape cassette holder 2 is provided with side plates 5 on the left and right sides of the bottom plate 4 on which the tape cassette can be placed, and these side plates 5, 5 are connected by the connecting rod 6. A pair of guide protrusions 7 and 8 (the guide protrusions of the right side plate 5 are not shown) are provided on the outer surfaces of the left and right side plates 5 of the tape cassette holder 2 at intervals in the front and rear. ing. These guide protrusions 7 and 8 are slidably inserted into L-shaped guide grooves 9 and 10 which are arranged side by side at a predetermined interval in front of and behind the left and right side plates 3 and 3, respectively. The tips are projected to the outer surface side of the left and right side plates 3,3. Then, the tape cassette holder 2 is attached to the left and right side plates via the guide protrusions 7 and 8.
It is supported between 3, 3 and is movably provided along the L-shaped guide grooves 9, 10.

On the outer surface side of the left and right side plates 3, 3 of the cassette loading device 1, a circular opening is divided into a plurality of (two in this example) radial support pieces 11 as shown in FIGS. 1 and 3. The divided circular openings 12 are formed respectively.

The plurality of radial support pieces 11 are formed so as to bulge out to the outer surface side of the left and right side plates 3, 3 of the cassette loading device 1 such that their intersections 13 are the tops.
A circular support hole 14 is formed in the center of the intersection 13. As shown in FIG. 2, a support shaft 16 protruding from the center of the inner surface of the loading gear 15 is rotatably fitted and supported in the support hole 14. Then the loading gear 15
They are attached to the outer surfaces of the left and right side plates 3, 3 of the cassette loading device 1 so as to cover a part of one (front side) L-shaped guide groove 9.

On the inner surface side of the loading gear 15, there is a bifurcated engagement member that engages with one side (front side) of the guide protrusion 7 described above.
17 is attached. Also, on the inner surface side of the loading gear 15, a plurality (for example, two) of engaging hooks 19 that engage with the arcuate edge portion 18 of the divided circular opening 12, and a plurality of (for example, a plurality of facing hooks that face the outer surfaces of the side plates 3, 3). 4) Anti-tilt legs 20
They are arranged at equal intervals in the circumferential direction.

The loading gear 15 formed by engaging a plurality of engaging hooks 19 with the circular arc edge portions 18 of the divided circular openings 12 has its opening area divided by the radial support piece 1, and therefore the rotation angle thereof is Limited to less than 180 °.
The loading gear 15 is rotated within its rotation angle range to move the guide protrusions 7 and 8 along the L-shaped guide grooves 9 and 10 to thereby move the tape cassette holder 2 from the unloading position to the loading position. To the unloading position and vice versa.

A driving gear 21 is meshed with the left and right loading gears 15, 15, and these driving gears 21, 21 are fixed to both ends of a common shaft 22, respectively, and are located at the front side positions of the side plates 3, 3. Is supported by the motor and is rotationally driven by a motor (not shown).

Thus, according to such a configuration, the loading gear 15
The loading gear 15 can be mounted at a predetermined distance from the side plates 3, 3 without lengthening the support shaft 16 and lengthening the bearing thereof. Moreover, when the support shaft 16 is fitted into the support hole 14 provided at the intersection 13 of the radial support piece 11, the engagement is prevented only by engaging the tip of the engaging hook 19 with the circular arc edge of the circular opening. Since it can be carried out, its mounting and assembling is very easy.

Further, since the engaging hook 19 engaged with the circular edge of the circular opening prevents the loading gear 15 from tilting, and the tilting prevention leg 20 also prevents the loading gear 15 from tilting, even if the support shaft 16 thereof is short. Regardless, the posture of the loading gear 15 can be kept stable.

The present invention is not limited to the above-mentioned embodiment,
It is also applicable to devices other than the cassette loading device. Further, it is of course possible to provide three or more radial support pieces depending on the rotation angle of the gear. In addition, various modifications can be made without departing from the scope of the invention.

(Effect of the Invention) As described above, according to the gear mounting mechanism of the present invention, since the radial support piece that supports the gear is formed to project toward the outer surface of the substrate, the support shaft of the gear is shortened to reduce its inclination. Can be suppressed. Even if the support shaft is slightly tilted,
Since the shaft length is short, fluctuations in the shaft-to-shaft distance from the mating gear are reduced, and smooth rotation transmission can be maintained.

Moreover, since the gear is provided with a plurality of anti-tilt legs, and the tips of these legs are made to closely face the substrate surface and the engaging hooks are engaged with the circular arc edge of the circular opening, the gear surface deflection It is possible to reliably prevent the inclination of the support shaft due to, suppress the fluctuation of the inter-axis distance between the gear and the counterpart gear, and perform smooth transmission of the rotational force.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view showing a schematic structure of a VTR loading device to which the present invention is applied, and FIG. 2 is a sectional view showing a gear mounting mechanism according to the present invention. 3 is an exploded perspective view of the same. 1 ... Cassette loading device, 2 ... Tape cassette holder, 3 ... Side plate (board) of loading device, 5 ... Side plate of tape cassette holder, 7 ... Guide protrusion, 9 ... Guide groove, 11 ...
Radial support piece, 12… Split circular opening, 13… Intersection, 14…
Support hole, 15 ... Loading gear, 16 ... Support shaft, 17 ... Engaging member, 18 ... Arc edge, 19 ... Engaging hook, 20 ... Tilt prevention leg.

Claims (1)

[Scope of utility model registration request] 1. A gear mounting mechanism comprising a gear (15) mounted on a substrate (3) so as to be rotatable within an angle range smaller than 180 ° and having a predetermined gap formed between the substrate and the substrate. The board is provided with a circular opening (12) divided in the circumferential direction by a plurality of radial support pieces (11), and the intersection (13) of the radial support pieces is attached to the board by gears. A supporting hole (14) that projects toward the surface side and that axially supports the gear is provided at this intersection, and a supporting shaft (16) that is rotatably fitted in the supporting hole is provided on one surface of the gear. A plurality of engaging hooks (19) for engaging the circular arc edges of the circular opening when the supporting shaft is fitted in the supporting hole, and the circular opening of the substrate when the supporting shaft is fitted in the supporting hole. Anti-tilt legs (2
0) and a gear mounting mechanism characterized by being provided.