JPS62112256A - Rotation transmitting mechanism by rocking gear - Google Patents

Abstract

PURPOSE:To correctly specify a mutual wheel base distance by abutting the outer circumferential surfaces of the regulating disk on each other provided in relation respectively at the time of gearing the rocking gear and the driven gear and gearing the oscillating gear and the driven gear with the mutual pitch circle. CONSTITUTION:When a driving gear 19 is rotated in the counter-clockwise direction, an rocking gear 14 geared to this is rotated in the clockwise direction, to an rocking arm 12, the turning force in the counter-clockwise direction is energized, and the rocking gear 14 supported to the rocking edge part is geared with a reel stand gear 6 of a reel stand 1. A regulating disk 15 coaxial to the gear 14 and a regulating disk 7 coaxial to the reel stand gear 6 are brought into contact with the mutual outer circumferential surface, the arm 12 is not rotated in the counter-clockwise direction more than it, and the gear 14 and the reel stand gear 6 are geared with the mutual pitch circle. On the other hand, when the driving gear 19 is rotated in the clockwise direction, regulating disks 15 and 7' are contacted with the mutual outer circumferential surface and the oscillating gear 14 and the reel stand gear 6' are geared by the mutual pitch circle.

Description

DETAILED DESCRIPTION OF THE INVENTION A rotation transmission mechanism using a swing gear according to the present invention will be explained according to the following items.

A. Industrial application field Summary of B1 invention C0 prior art [Figure 5] Problems that D0 invention attempts to solve Means to solve the E1 problem F. Example [Fig. 1, Fig. 2] a. Reel stand Swinging arm C8 drive unit 61 action e. Modification [Fig. 3, Fig. 4] Effects of G9 inventions (A. Industrial application field) The present invention relates to a rotation transmission mechanism using a novel swing gear.

Specifically, rotation by a new rocking gear that has a simple structure allows for accurate regulation of the center distance during power transmission between the rocking gear supported by the rocking member and the driven gear. The aim is to provide a transmission mechanism.

CB, Summary of the Invention) The rotation transmission mechanism using the swing gear of the present invention provides a coaxial regulating disk for each gear in relation to the swing gear and the driven gear, and when the swing gear and the driven gear mesh, The outer circumferential surfaces of the respective regulating discs are in contact with each other, so that the swing gear and the driven gear mesh with each other at their pitch circles, so that when the swing gear and the driven gear are brought together, i.e. The shaft pressure between the swing gear and the driven gear during power transmission can be well defined (C
, Prior Art) [Fig. 5] A rotation transmission mechanism that transmits rotation via a swing gear supported by a swing member is convenient for selectively transmitting rotation to two driven gears, for example. It is widely used in drive mechanisms for reel stands in video tape recorders, audio tape recorders, etc.

FIG. 5 shows an example of a rotation transmission mechanism using such a swing gear, which is described in Japanese Utility Model Publication No. 36-21711. The reference numerals shown in FIG. 5 are the same as those used in the above-mentioned publication, with parentheses added thereto.

In Fig. 5, (3) is a swingable conversion plate, and a base shaft gear (1) is provided on the same axis as the rotation axis, and a conversion gear (1) is provided at the swinging end of the conversion plate (3). (2) is rotatably supported, and this conversion gear (2) is connected to the main shaft gear (1).
It meshes with.

(8) is the outer shaft gear, and (9) is the descending shaft gear.

The conversion gear (2) is attached to these two gears (8) and (9).
engage selectively. That is, when the single shaft gear (1) rotates clockwise, the conversion plate (3) rotates clockwise, the conversion gear (2) meshes with the external shaft gear (8), and this (
8) Rotate.

Also, when the single-axis gear (1) rotates counterclockwise,
The conversion plate (3) rotates counterclockwise, and the conversion gear (2
) meshes with the descending shaft gear (9), causing it to rotate.

By the way, in such a rotation transmission mechanism, since the distance between the conversion gear (2) and the two gears (8) and (9) changes, the shaft pressure between them approaches each other. Otherwise, the conversion gear (2) and the two gears (8) and (9) will mesh with each other beyond their pitch circles, resulting in increased gear loss and, in some cases, the gears will not rotate.

To this end, in order to restrict the amount of rotation of the conversion plate (3), the stop pins (10) and (10) are sunk once, and the conversion plate (3)
contact the stop pins (10), (10) and cannot rotate any further, causing the conversion gear (2) and gears (8), (9) to mesh more deeply than necessary. I try not to have any.

(D. Problem to be solved by the invention) However, as described above, the stop pin (lO), (10) is provided on the chassis, and the switch plate (3) is attached to the stop pin (lO), (10).
By bringing the side edges of the conversion gears (2) and 2 into contact with each other,
When the distance between the two gears (8) and (9) is defined, its accuracy depends on the machining accuracy of the conversion plate (3), the stopping pin (1
The mounting accuracy of (o) and (10) depends on the processing accuracy and work accuracy of many parts.

If the machining accuracy of many parts is depended on in this way, small errors regarding each part will accumulate, and the total of these errors will become large.

Therefore, in the conventional rotation transmission mechanism using a swing gear, the mesh between the swing gear and the driven gear becomes too deep, resulting in severe wear of the gear, or in some cases, the gear becomes unable to rotate. On the other hand, the meshing between the swing gear and the driven gear becomes too shallow, causing problems such as loud noise and increased gear wear.

The present invention has been made to eliminate such inconveniences, and it is possible to accurately define the distance between the shafts during power transmission between the swing gear and the driven gear, and
The present invention aims to provide a rotation transmission mechanism using a novel swing gear that has a simple structure.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the rotation transmission mechanism using the swing gear of the present invention has a regulation circle coaxial with each gear in relation to the swing gear and the driven gear. A plate is provided so that when the swing gear and the driven gear mesh, the outer circumferential surfaces of the regulating discs provided in relation to each come into contact, so that the swing gear and the driven gear mesh at approximately the pitch circle of each other. This is what I did.

Therefore, in the rotation transmission mechanism using the swing gear of the present invention, when power is transmitted between the swing gear and the driven gear, the outer peripheral surfaces of the regulating discs come into contact with each other, so that the swing gear and the driven gear are in contact with each other. Since they mesh approximately at each other's pitch circles, the distance between their axes is correctly defined. Further, since the distance between the axes is defined by a regulating disc coaxial with each gear, which is a member close to each gear, the precision can be extremely high, and the structure is simple.

(F. Embodiment) [FIGS. 1 and 2] Details of the rotation transmission mechanism using the swing gear of the present invention will be described below according to the illustrated embodiment. In the illustrated embodiment, the present invention is applied to a reel stand drive mechanism in a tape recorder.

(a, Reel stand) In the figure, 1.2 is a reel stand, which is rotatably supported by a support shaft 4.5 erected from the chassis 3.

In addition, since each reel stand 1, 2 is configured approximately the same,
One of them, 1, will be described in detail, and the other 2 will be given the same reference numerals as those of the other 1 with a "'" symbol added thereto, and the explanation thereof will be omitted.

The reel stand 1 is formed by integrally forming a reel stand gear 6, a regulating disk 7, and an engagement shaft 8.

The reel base gear 6 has a spur gear shape, that is, a shape in which gear teeth 9, 9, . . . are formed on the outer periphery of a disc. still,
10 indicates a pitch circle of the reel base gear 6.

The regulating disc 7 is formed into a disc shape coaxial with the reel base gear 6, and its diameter D1 is equal to the pitch circle 10 of the reel base gear 6.
is the same as the diameter of

Such a regulating disk 7 is integrally formed with an intermediate portion 11 having a smaller diameter than the dedendum circle of the reel base gear 6 interposed therebetween. Note that the reel base gear 6 and the regulating disc 7 do not have to be formed integrally, and may be formed separately and coupled so as to be coaxial.

The engagement shaft 8 is engaged with an engagement hole formed in a reel hub of a tape cassette (not shown), and is provided upright from the center of the regulation disc 7.

(b, Swing Arm) 12 is a swing arm, the base of which is rotatably supported by a support tube 13 erected on the chassis 3.

Reference numeral 14 denotes a swing gear rotatably supported at the tip of the swing arm 12, that is, at the swing end. Appropriate friction occurs between the lower surface of the swing gear 14 and the upper surface of the swing arm 12, that is, a force that rotates the swing arm 12 in a predetermined direction depending on the direction of rotation of the swing gear 14. The friction is strong enough not to hinder the rotation of the swing gear 14.

Reference numeral 15 denotes a regulating disc, which is formed into a circular root shape coaxial with the swing gear 14, and its diameter D2 is the same as the diameter of the pitch circle 14D of the swing gear 14. Such a regulating disk 15 is formed integrally with the swing gear 14 via an intermediate portion having a smaller diameter than the tooth root circle of the swing gear 14, but this is formed separately. The swing gear 14 and the regulation disc 15 may be integrally coupled.

(c, drive section) 16 is a drive section, which is fixed to a motor 17 fixed to the lower surface of the chassis 3 and an output shaft 18 of the motor 17 that is inserted through the support tube 13 and protrudes to the upper surface side of the chassis 3. The first drive gear 19 is meshed with the swing gear 14.

(d, Effect) In the above-described rotation transmission mechanism using a swing gear, when the drive gear 19 is rotated counterclockwise by the motor 17, the swing gear 14 that is engaged with the drive gear 19 is rotated clockwise. It is made to rotate.

As a result, a counterclockwise rotational force is applied to the swing arm 12. Therefore, the swing arm 12 rotates counterclockwise, and the swing gear 14 supported at the swing end thereof meshes with the reel stand gear 6 of the reel stand 1.

When the swing gear 14 rotates in the rotating direction, the counterclockwise rotational force of the swing arm 12 is always lost as described above.

Since the regulating disc 15 coaxial with the swinging gear 14 and the regulating disc 7 coaxial with the reel stand gear 6 come into contact with each other on their outer peripheral surfaces, the swinging arm 12 will no longer move counterclockwise. will no longer rotate. Since the regulating disc 15.7 has the same diameter as the pitch circle of the gear 14.6 with which it is associated, the swing gear 14 and the reel stand gear 6 are arranged within one pitch circle of each other. It will be combined. Therefore, the meshing of gear 6.14 for both cars is too shallow, and
It will always rotate in the optimal mesh state without being too deep.

On the other hand, when the drive gear 19 rotates clockwise, the swing gear 14 rotates counterclockwise, and the swing arm 12 rotates clockwise. Therefore, the swing gear 14 meshes with the reel stand gear 6' of the reel stand 2, and the regulating disc 1
5 and 7' come into contact with each other on their outer peripheral surfaces, so that the swing gear 14 and the reel stand gear 6' mesh with each other at their pitch circles.

(e, Modification) [Figs. 3 and 4] Figs. 3 and 4 show a modification of the rotation transmission mechanism using the swing gear of the present invention.

This variant is similar to the previous embodiment except that the diameter of the regulating discs is not the same as the diameter of the pitch circle of the gear with which they are associated.

That is, the diameter D2 of the regulating disc 15A coaxial with the swing gear 14
A is made smaller than the diameter of the pinch circle of the swing gear 14, and a regulating disk 7.7' coaxial with the reel base gear 6.6'.
The diameters A, D', and A are larger than the diameter of the pitch circle of the gear 6.6°. And the diameter D2A and DIA
The sum of the diameters of the pitch circles of the two gears 14.6 is equal to the sum of the diameters of the pitch circles of the two gears 14.6, and the sum of The sum is equal to [7].

Therefore, also in this modification, the swing gear 14 and the reel stand gear 6 and the swing gear 14 and the reel stand gear 6' are meshed with each other at their respective pitch circles.

In this modification, there will be a difference in circumferential speed between the regulating discs 15 and 7 or 7' that are in contact with each other, and a frictional force will be generated between them. This frictional force eliminates the punch clash between the gears 14 and 6 or 6', which have the same effect as the gears 14 and 6 or 6', thereby producing effects such as reducing noise during rotation. Note that the diameter of the regulating disc 15 on the swing gear 14 side is made larger than the diameter of the pitch circle 14D of the swing gear 14, and the diameter of the regulating disc 7.7' on the side of the wheel base gear 6.6' is made larger than the diameter of the pitch circle 14D of the swing gear 14. Of course, the same operation and effect can be obtained even if the diameter of the pitch circle of the gear 6.6' is made smaller than the diameter of the pitch circle of the gear 6.6'.

(G. Effects of the Invention) As is clear from the above description, the rotation transmission am by the swing gear of the present invention is carried out between the swing gear supported by the swing member and the driven gear that meshes with the swing gear. A regulating disk coaxial with each gear is provided in relation to the swinging gear and the driven gear, and an outer circumferential surface of the regulating disk relating to the swinging gear and an outer circumference of the regulating disk relating to the driven gear are provided. Set the diameters of the regulation disc associated with the oscillation gear and the regulation disc related to the driven gear so that the oscillation gear and the driven gear mesh approximately at each other's pitch circles when they come into contact with the surfaces. It is characterized by what it did.

Therefore, in the rotation transmission mechanism using the swing gear of the present invention, when power is transmitted between the swing gear and the driven gear, the outer peripheral surfaces of the regulating discs come into contact with each other, so that the swing gear and the driven gear are in contact with each other. Since they mesh approximately at each other's pitch circles, the distance between their axes is correctly defined. Further, since the distance between the axes is defined by a regulating disc coaxial with each gear, which is a member close to each gear, the precision can be extremely high, and the structure is simple.

In the above embodiment, each gear and its associated regulating disk are overlapped with an intermediate portion having a diameter smaller than the pitch circle of the gears interposed therebetween. One side is enough.

Further, in the above embodiment, the swing gear selectively meshes with two driven gears, but it is also possible to use only one driven gear, and the swing member may be pressed by a spring or the like. The rotating force may be applied in a direction to cause the swing gear to mesh with the driven gear.

[Brief explanation of drawings]

1 and 2 show an example of the implementation of a rotation transmission mechanism using a rocking gear according to the present invention, in which FIG. 1 is a plan view and FIG. 2 is a sectional view taken along line II-11 in FIG. 1. 3 and 4 show a modification of the rotation transmission mechanism using the rocking gear of the present invention, FIG. 3 is a plan view, and FIG.
FIG. 5 is a cross-sectional view taken along line IV-IV in the figure, and a plan view showing an example of a rotation transmission mechanism using a conventional rocking gear. Explanation of symbols 6II...driven gear, 6'...driven gear, 7...
- Regulation disk, 7'... Regulation disk, 12... Swinging member, 14... Swinging gear. 15...Regulation disk. ``夛' [Yes] Yen Lffiko Tn (I envy Ita'

Claims (3)

[Claims] (1) A swing gear supported by a swing member and a driven gear that meshes with the swing gear, and a regulating disk coaxial with each gear is provided in relation to the swing gear and the driven gear. , so that when the outer circumferential surface of the regulating disk associated with the oscillating gear and the outer circumferential surface of the regulating disk associated with the driven gear come into contact, the oscillating gear and the driven gear mesh at approximately pitch circles of each other. A rotation transmission mechanism using a swing gear, characterized in that the diameters of a regulation disc related to the swing gear and a regulation disc related to the driven gear are set. (2) The diameter of the regulating disc associated with the rocking gear was approximately equal to the diameter of the pitch circle of the rocking gear, and the diameter of the regulating disc associated with the driven gear was approximately equal to the diameter of the pitch circle of the driven gear. A rotation transmission mechanism using a swing gear according to claim 1, characterized in that: (3) A rotation transmission mechanism using an oscillating gear according to claim 1, characterized in that the diameter of each regulating disc is different from the diameter of a pitch circle of each associated gear.