JPH0554478A - Friction clutch mechanism - Google Patents

Abstract

PURPOSE:To enable arrangement even if space in an axial direction is small. CONSTITUTION:The mechanism is provided with a friction plate 20 interposed between two rotary bodies 16, 17 and a press-contacting spring 21 by which one rotary body 16 is brought into press-contact with the other rotary body 17 via the friction plate; the press-contacting spring is made of a leaf spring material, and a center plate 21a, which is attached to a shaft 18 supporting the two rotary bodies, and plural arm pieces 21b, which are set protrudingly from the edge of the center plate, extended along the periphery of the center plate and are bent at each tip so as to shift towards one rotary body, are integrally formed. Since the press-contacting spring 21 is formed with the leaf spring material, the dimension of the mechanism in the axial direction is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel friction clutch mechanism. More specifically, it is an object of the present invention to provide a novel friction clutch mechanism for transmitting a rotational force by friction between two rotating bodies and which can be arranged even when the space in the axial direction is small. is there.

[0002]

2. Description of the Related Art A conventional friction clutch mechanism, for example, a friction clutch mechanism which transmits a rotational force by friction to a limiter gear interposed in the middle of a rotation transmission system to a reel stand in a tape recorder, includes a limiter gear a and a drive gear b. Are rotatably supported by the same support shaft c, a friction plate d made of felt or the like is interposed between the two gears a and b, and a spring receiving member is provided at the end of the support shaft c on the drive gear b side. attach e,
A coil spring f is interposed between the spring receiving member e and the drive gear b in a compressed state, and the drive gear b is pressed against the limiter gear a via the friction plate d by the coil spring f.

Therefore, when the drive gear b rotates, its rotational force is transmitted to the limiter gear a via the friction plate d, and the limiter gear a is rotated.

When the limiter gear a is subjected to a load larger than the rotation transmission force of the friction plate d and the coil spring f, a stumbling occurs between the limiter gear a and the friction plate d.

[0005]

By the way, in the above-mentioned conventional friction clutch mechanism, the coil spring f is used as the elastic member for pressing the drive gear b against the limiter gear a through the friction plate d. However, the axial dimension becomes large, which hinders miniaturization.

[0006]

In order to solve the above-mentioned problems, the friction clutch mechanism of the present invention includes a friction body interposed between two rotating bodies and one rotating body rotating the other rotating body via the friction body. A crimp spring for press-contacting the body, the crimp spring being made of a leaf spring material; a center plate attached to a shaft supporting two rotating bodies; and a peripheral edge of the center plate protruding from the peripheral edge of the center plate. And a plurality of arm pieces that are bent so that their tip ends are displaced toward one of the rotating bodies and are integrally formed.

[0007]

Therefore, in the friction clutch mechanism of the present invention,
Since the crimp spring made of a leaf spring material is used as the elastic member that presses one rotating body against the other rotating body through the friction body, the axial size is small, which contributes to downsizing in this direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the friction clutch mechanism of the present invention will be described below with reference to the embodiments shown in the accompanying drawings. The illustrated embodiment uses the friction clutch mechanism of the present invention in a tape recorder.

In the figure, 1 is a tape recorder to which the present invention is applied, 2 is its housing, 3 is a lid for opening and closing a cassette attaching / detaching port 4 formed on the upper surface of the housing 2, and the lid 3 When opened as shown in the figure, the upper surface of the cassette mounting recess 5 is opened through the cassette mounting port 4, and the tape cassette 6 can be mounted in and dismounted from the cassette mounting recess 5.

Reference numeral 7 denotes a chassis arranged in the housing 2, and a portion surrounded by the housing 2 on the upper side of the chassis 7 is a cassette mounting recess 5.

In the cassette mounting recess 5, two reel bases 8 and 8'are rotatably supported by the chassis 7 in a state of being separated from each other in the left and right directions, and a reel base gear integrated with the reel bases 8 and 8 '. 9, 9 ′ are located on the lower side of the chassis 7. The reel base gears 9 and 9'are the large gears 9a,
9'a and the small gears 9b and 9'b are integrally formed.

Reference numeral 10 denotes a motor fixed to the lower left position of the chassis 7, and a pulley 11 is fixed to a rotary shaft 10a of the motor 10.

Reference numeral 12 denotes a pulley rotatably supported on the lower surface of the chassis 7 substantially in the center of the front side, and a small drive gear 13 is integrally formed at the center of the lower surface of the pulley 12. Then, the pulley 12 and the rotating shaft 10 of the motor 10
An endless belt 14 is stretched over the pulley 11 fixed to a, so that when the motor 10 rotates, the pulley 12 rotates.

Reference numeral 15 is a FR slider which is long in the left and right,
The lower surface of the chassis 7 is slidably supported in the left-right direction at the center in the front-rear direction.

Reference numeral 16 denotes an intermediate gear, which is rotatably supported on the lower side of the FR slider 15 and is always meshed with the drive gear 13.

Reference numeral 17 denotes a limiter gear, which is rotatably supported on a support shaft 18 which is vertically provided above the intermediate gear 16 from the FR slider 15 and on which the intermediate gear 16 is supported.

The intermediate gear 16 and the limiter gear 17
A torque limiter 19 is interposed between and. The torque limiter 19 includes a friction plate 20 made of a material having a large friction coefficient, such as felt, and a pressing spring 21 that presses the intermediate gear 16 against the limiter gear 17 via the friction plate 20.

The pressing spring 21 is made of a leaf spring material,
A plurality of "L" -shaped arm pieces 21b, 21b, 21b are formed from the circular center plate 21a to the arm pieces 21b, 21b, 2 respectively.
A long piece 1b is provided so as to extend in the circumferential direction along the peripheral edge of the center plate 21a, and each arm piece 21b, 21b, 21b is slightly bent so that its tip is displaced upward. Further, small engaging pieces 21c, 21c, 21c are provided to project outward from the tips of the arm pieces 21b, 21b, 21b.

Reference numeral 22 denotes a bearing body, which is formed by integrally forming a tubular portion 22a and a flange portion 22b protruding at one end of the tubular portion 22a, and the limiter gear 17 has a tubular portion 17a at its center. It is integrally formed.

An annular projection 16b projecting toward the limiter gear 17 is integrally formed at the opening edge of the center hole 16a of the intermediate gear 16, and a friction plate 20 in the form of a circular strip is formed so as to surround the projection 16b. It is bonded to the intermediate gear 16.

Further, on the surface of the intermediate gear 16 on the side opposite to the limiter gear, the projections 23, 23, 23 arranged on the same circumference are provided.
The protrusions 23, 23, 23 are notch-shaped engaging with the protrusions 23, 23, 23 at different heights, that is, from the surface of the intermediate gear 16 on which the protrusions 23, 23, 23 are formed. Part 23
A set of three a, 23b, and 23c are formed on each of the ridges.

Thus, the cylindrical portion 17a of the limiter gear 17
The center hole 16a of the intermediate gear 16 is rotatably fitted on the outer peripheral surface of the intermediate gear 16, and the cylindrical portion 22a of the bearing body 22 is press-fitted into the cylindrical portion 17a of the limiter gear 17 from the side where the intermediate gear 16 is located. At the same time, the center plate 21a of the pressing spring 21 is rotatably positioned between the end surface of the cylindrical portion 17a of the limiter gear 17 and the flange portion 22b of the bearing body 22. Then, the engaging pieces 21 of the arm pieces 21b, 21b, 21b of the pressing spring 21.
c, 21c, 21c are engaged portions 23a, 2 of the intermediate gear 16
3a, 23a or 23b, 23b, 23b or 23c,
It engages with either 23c or 23c.

As a result, the arm piece 21 of the pressing spring 21 is
b, 21b, 21b elastically press the lower surface of the intermediate gear 16, and thereby an upward moving force is applied to the intermediate gear 16, so that the intermediate gear 16 passes through the friction plate 20 and the limiter gear 17 Is crimped to. The pressure force between the intermediate gear 16 and the limiter gear 17 can be selected by selecting the engaging portions 23a, 23b, 23c with which the engaging piece 21c engages.

Then, the support shaft 18 is rotatably inserted into the cylindrical portion 22a of the bearing body 22.

Therefore, when the intermediate gear 16 rotates, the limiter gear 17 also rotates integrally with the intermediate gear 16. However, when a large load is applied to the limiter gear 17, a snag is generated between the friction plate 20 and the limiter gear 17.

When the FR slider 15 moves to the left, the intermediate gear 16 also moves to the left, and the reel base 8'on the take-up side (hereinafter referred to as "T-side reel base"). The reel base gear 9 '(hereinafter, referred to as "T-side reel base gear") meshes with a small gear 9'b to rotate the T-side reel base 8'at high speed in the tape winding direction. Also,
When the FR slider 15 moves to the right, the intermediate gear 16 also moves to the right with it, and the reel base gear 9 (hereinafter, “S side reel base”) of the supply side reel base 8 (hereinafter, referred to as “S side reel base”). (S-side reel base gear ") meshes with the small gear 9b to rotate the S-side reel base 8 at high speed in the tape winding direction.

Reference numeral 24 denotes a take-up arm rotatably supported on the lower surface of the chassis 7 substantially at the center in the left-right direction on the rear side, and is made of a leaf spring material.

Reference numeral 25 denotes a gear support portion of the take-up arm 24 having a plate shape elongated in the left-right direction.
A front portion in the center in the left-right direction is rotatably supported by a support shaft 26 vertically provided on the chassis 7. Play gears 27 and 27 'are rotatably supported on the lower sides of the left and right ends of the gear support 25.

Small projections 25a and 25a 'are provided at positions on the left and right ends of the rear edge of the gear support 25.

28 is a relay gear rotatably supported on the support shaft 26 below the take-up arm 24,
The relay gear 28 is constantly meshed with the limiter gear 17 and the play gears 27, 27 '.

Reference numeral 29 denotes a regulation slider which is slidably supported in the left-right direction at a position along the rear end edge of the lower surface of the chassis 7, and is pressed at a position of the front edge that is slightly laterally offset from the center. The parts 30 and 30 'are projected. And
Notches 31 and 31 'opened in a "V" shape are formed at the centers of the front edges of the pressing portions 30 and 30'.

When the take-up arm 24 tilts, the protrusion 25a or 2 of the restricting slider 29 is in the center of its moving range, that is, in the neutral position.
5a 'enters the notch 31 or 31' formed in the pressing portion 30, 30 'of the regulation slider 29, whereby
The take-up arm 24 has its play gear 27 or 27.
It is possible to rotate to the position where ′ meshes with the large gear 9a or 9′a of the reel base 8 or 8 ′.

Then, the take-up arm 24 is tilted so that its play gear 27 or 27 'is moved to the reel stand 8 or 8.
When the gear is engaged with the large gear 9a or 9'a, it is a play mode in which recording and reproduction are performed, and a magnetic tape (not shown) is run at a constant speed and is engaged with the T-side reel stand 8'to rotate. The tape is taken up by the T-side tape reel (in the normal play mode) or the S-side tape reel (in the reverse play mode) engaged with the S-side reel stand 8.

The restriction slider 29 moves to the left (when FF or cue) or to the right (when REW or review) from the neutral position when running the magnetic tape at a high speed. When moved, the take-up arm 24 in which the play gear 27 or 27 'meshes with the large gear 9a or 9'a of the reel stand 8 or 8'.
The protrusion 25a or 25a 'of the regulating slider 29 is pressed by a portion of the pressing portion 30 or 30' of the regulating slider 29 located beside the notch 31 or 31 'to rotate the take-up arm 24,
The play gear 27 or 27 'is replaced with the reel base gear 9a or 9'.
Separate from a.

Therefore, from the play state, the FR slider 1
When 5 moves to the left, the regulating slider 29 moves to the left from the neutral position via the interlocking mechanism to rotate the take-up arm 24 to move its play gear 27 or 27 'to the reel base gear 9a or 9'a. When the FR slider 15 is moved to the left, the intermediate gear 16 meshes with the small gear 9'b of the T-side reel stand 8'and the T-side reel stand 8 is moved.
The ′ is rotated at a high speed in the tape winding direction, whereby the cue state is revealed.

From the play state, the FR slider 15
When is moved to the right, the regulation slider 29 is moved from the neutral position to the right through the interlocking mechanism to rotate the take-up arm 24 to move the play gear 27 or 27 'from the reel base gear 9a or 9'a. By moving the FR slider 15 to the right, the intermediate gear 16 meshes with the small gear 9b of the S-side reel stand 8 to rotate the S-side reel stand 8 at high speed in the tape winding direction. The review status is revealed.

[0037]

As is apparent from the above description, the friction clutch mechanism of the present invention is a friction clutch mechanism for transmitting a rotational force by friction between two rotating bodies. A shaft for supporting the two rotating bodies, comprising a friction body interposed between the rotating body and a crimp spring for pressing one rotating body to the other rotating body through the friction body, and the crimp spring is made of a leaf spring material. And a plurality of arm pieces projecting from the peripheral edge of the central plate, extending along the peripheral edge of the central plate, and having their tip portions bent so as to be displaced toward one of the rotating bodies. It is characterized by being integrally formed.

Therefore, in the friction clutch mechanism of the present invention, since the crimp spring made of the leaf spring material is used as the elastic member for pressing one rotating body against the other rotating body through the friction body, the axial direction Is small, which contributes to downsizing in this direction.

It should be noted that the specific shapes and structures shown in the above embodiments are merely examples for embodying the present invention, and the technical scope of the present invention is limitedly interpreted by these. It is not something that will be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a tape recorder to which a friction clutch mechanism of the present invention is applied.

FIG. 2 is a plan view showing a mechanical portion of the tape recorder.

FIG. 3 is an exploded perspective view of a friction clutch mechanism.

FIG. 4 is an enlarged sectional view of a friction clutch mechanism.

FIG. 5 is an enlarged bottom view of the friction clutch mechanism.

FIG. 6 is an exploded perspective view showing a portion of the tape recorder where a friction clutch mechanism is provided.

FIG. 7 is a plan view of a main part showing a state of forward reproduction.

FIG. 8 is a plan view of an essential part showing a state of reverse reproduction.

FIG. 9 is a plan view of an essential part showing a cue state.

FIG. 10 is a plan view of an essential part showing a review state.

FIG. 11 is a sectional view showing an example of a conventional friction clutch mechanism.

[Explanation of symbols]

 16 One rotating body 17 The other rotating body 20 Friction body 21 Crimping spring 21a Center plate 21b Arm piece

Claims (1)

[Claims] 1. A friction clutch mechanism for transmitting a rotational force by friction between two rotating bodies, wherein a friction body interposed between the two rotating bodies and one rotating body via the friction body. A pressure plate spring for press-contacting the other rotating body, the pressure spring being made of a leaf spring material; and a center plate attached to a shaft supporting the two rotating bodies and a center plate protruding from the peripheral edge of the center plate. A friction clutch mechanism, characterized in that a plurality of arm pieces extending along the peripheral edge of the plate and bent at its tip to be displaced toward one of the rotating bodies are integrally formed.