JPS61184248A - Rotation transmitting mechanism - Google Patents

Abstract

PURPOSE:To enable selective transmission of a power to a first and a second wheel body, by a method wherein a wing arm is forced into frictional coupling with a solar wheel body rotated forwardly and reversely by a driving means. CONSTITUTION:When, with a driving motor 2 forward rotated, a worm 3 is rotated in the direction of an arrow mark (a), a solar gear 7 is rotated in the direction of an arrow mark (b). With the solar gear 7 rotated, a swing arm 10, forced into frictional engagement therewith, is followed and is swing in the direction of an arrow mark (c) and moved to a first position, and a second planetary gear 15 is geared with a first gear 19 to rotate the first gear in the direction of an arrow mark (d). Meanwhile, with a driving motor reversed, the worm 3 is rotated in a direction reverse to the arrow mark (a), and the solar gear is rotated in a direction reverse to the arrow mark (b). A swing arm 10 is moved from a first position to a second position, a first planetary gear 13 is geared with a second gear 21 to rotate it in the direction of an arrow mark (h). The first and second gears 19 and 21 are respectively coupled to 2 systems of wheel trains, not shown.

Description

Detailed Description of the Invention Technical Field The present invention relates to a rotation transmission mechanism, more specifically, a rotation transmission mechanism that selectively transmits the driving force of one drive source to two transmission trains according to the forward and reverse rotation of the drive source. Regarding the mechanism.

Conventionally, when selectively driving two wheel trains, it is necessary to selectively rotate the drive motor provided for each wheel train, or
One drive motor is rotated in one direction, and a clutch mechanism is provided between this motor and the transmission train to perform switching.

The former requires two drive motors, and a circuit for driving and controlling each motor must be provided for each motor, while the latter requires a clutch mechanism, making the configuration complex and requiring the use of an electromagnetic clutch. There were problems in terms of configuration and cost, such as the need for a control circuit.

Purpose An object of the present invention is to provide a rotation transmission mechanism that has a simple configuration and is inexpensive.

Structure: The rotation transmission mechanism of the present invention frictionally couples a swinging arm to a solar wheel that is rotated forward and backward by a driving means, and when the sunwheel rotates forward, the swinging arm swings to the first position. Then, the planet wheel, which is supported by the swinging arm and is always engaged with the solar wheel, is engaged with the first wheel and rotated. When the solar wheel rotates in the opposite direction, the solar wheel The oscillating arm is moved to the second position by the frictional force with the body, and the planet wheel body is engaged with the second wheel body to rotate it.In other words, the rotation of the driving means is based on the forward and reverse rotation of the sun wheel body. Accordingly, the signal is selectively transmitted to the first wheel body and the second wheel body and selectively rotates them.

The first wheel body and the second wheel body are connected in different rows.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIG. 1, reference numeral 1 indicates a drive motor 2 and a worm 3.
It shows a driving means consisting of. The drive motor 2 is a direct current motor whose rotation direction can be switched between forward and reverse directions, and is fixed to the substrate 4.

The worm 3 is inserted into and fixed to a worm shaft 6 connected to the output shaft 5 of the drive motor 2, and this worm shaft is
It is rotatably supported on bearing parts 4a and 4b of the board 4.

A sun gear 7 consisting of a worm gear serving as a sun wheel meshes with the worm 3. As shown in FIG. 3, the sun gear 7 is rotatably supported by a support shaft 8 fixedly attached to the base plate 4 via a sleeve 9. sleeve 9
A base portion 10a of a swinging arm 10 is rotatably inserted between the base end flange 9a and the end surface of the worm gear 7. The sleeve 9 includes a fixing member 1 in which a friction member 11 made of an annular leaf spring is pressed against the end surface of the worm gear 7.
2 is fixed. Sun gear 7 by friction member 11
and the swinging arm 10 are frictionally coupled to each other.

A first planetary gear 13 , which forms part of a planetary wheel that constantly meshes with the sun gear 7 , is supported by a support shaft 14 on the swinging arm 10 . A second planetary gear 15 meshes with the first planetary gear 13 , and the second planetary gear 15 is supported by the swing arm 10 by a support shaft 16 . A positioning hole 17 is formed in the free end of the swing arm 10. A positioning pin 18 fixed to the substrate 4 is fitted into this hole 17, and the swinging range of the swinging arm 10 can be changed between the first position shown in FIG. 1 and the second position shown in FIG. It is regulated between The first position, as shown in FIG. 1, refers to the position where the second planetary gear 15 meshes with the first gear 19, which will be described later. The second position, as shown in FIG. This indicates a position where the gear 13 meshes with a second gear 21, which will be described later.

5 - On the substrate 4, a first gear 19 that meshes with the second planetary gear 15 is attached to the support shaft 2 when the swing arm 10 is positioned at the first position.
It is rotatably supported by 0. Further, a second gear 21 that meshes with the first planetary gear 13 is rotatably supported on the base plate 4 by a support shaft 22 when the swing arm 10 is positioned at the second position. First gear 19 and second gear 21
are respectively connected to two train trains (not shown), and when rotated by the planetary gears, each gear rotates its respective wheel train.

As shown in FIG. 1, when the drive motor 2 rotates forward and the worm 3 rotates in the direction of arrow a, the sun gear 7 is rotated in the direction of the arrow. When the sun gear 7 rotates, the swing arm 10 frictionally connected to the sun gear 7 follows and swings in the direction of arrow C to be located at the first position, and the second planet gear 15
meshes with the first gear 19 and rotates it in the direction of arrow d. Next, the drive motor 2 rotates in the reverse direction, and as the worm 3 rotates in the direction of arrow e, as shown in FIG. 2, the sun gear 7 is rotated in the direction of arrow f. When the sun gear 7 rotates, the swing arm 10 frictionally coupled to the sun gear 7 follows and swings from the first position in the direction of arrow g to the second position.
The first planetary gear 13 is meshed with the second gear 21 and rotated in the direction of the arrow. The first gear 19 and the second gear 21 are each connected to two trains (not shown),
When each gear is rotated, it drives its respective train in rotation.

Next, an application example of the rotation transmission mechanism of the present invention will be explained.

FIG. 4 shows a two-stage cassette type paper feeding device in a recording device such as a copying machine or a facsimile machine. This paper feeding device includes an upper paper feeding mechanism 23, a lower paper feeding mechanism 24, and a pair of registration rollers 25 that receive the recording paper selectively sent out from both mechanisms and convey it to a recording section (not shown). It consists of Upper paper feeding mechanism 23 and lower paper feeding mechanism 24
The configuration includes a paper feed path 2 that communicates with a pair of registration rollers 25.
6.27 have the same length and are only arranged in upper and lower positions, so we will explain the structure of the upper paper feed mechanism 23, and the structure of the lower paper feed mechanism 24 will be explained with reference to the upper paper feed mechanism. 23, and the explanation thereof will be omitted.

The upper paper feeding mechanism 23 includes a feed roller 28 that rotates in the direction of the arrow to feed the recording paper in the paper feeding direction, and a feed roller 28 that is stopped or rotates in the opposite direction to the paper feeding direction and feeds paper other than the topmost paper. a friction roller 29 that suppresses the advance of the recording paper S, a pickup roller 30 that sends out the stacked recording paper S toward both rollers 28 and 29, a cassette 31 that stores the recording paper S, and a movable roller of this cassette. bottom plate 31a of
a bottom plate push-up lever 32 for pushing up the recording paper stacked on the plate and lifting the uppermost recording paper to a predetermined position relative to the pickup roller 30; and a bottom plate drive for swinging this lever. It consists of a shaft 33.

The cassette 31 is detachably attached to a cassette holder (not shown). When the bottom release push-up lever 32 is swung by the rotation transmission mechanism described later, the recording paper S
is raised to a predetermined position relative to the pickup roller 30. FIG. 4 shows the upper and lower bottom plate push-up levers 32.
32L also shows an elevated state.

The bottom plate drive shaft 33 and the bottom plate drive shaft 33L are selectively driven by a rotation transmission mechanism shown in FIG. In addition, in FIG. 5, the drive motor 2° worm 3. Sun gear7. Swing arm 10. First planetary gear 13. The second planetary gear 15 and the first and second gears 19 and 21 are given the same reference numerals, and are each attached to a side plate (not shown). Note that small-diameter tooth portions 19a and 21a are integrally formed on the first gear 19 and the second gear 21, respectively.

An operating lever 34 is fixed to the bottom plate drive shaft 33. The free end 34a of this lever 34 is positioned on the rotation locus of the engagement pin 36, which is equivalent to the end surface of the drive shaft 35. The drive shaft 35 is rotatably supported by a support shaft 37, and has teeth 35a formed on its outer periphery. A small-diameter tooth portion 38a of an idle gear 38 meshes with the tooth portion 35a. The large diameter tooth portion 38b of the idle gear 38 is
It meshes with the small diameter tooth portion 19a of the first gear 19. Hereinafter, the reduction gear train extending from the first gear 19 to the drive shaft 35 will be referred to as a second wheel train 39.

A second gear train 40 consisting of a similar reduction gear train is also provided between the bottom plate drive shaft 33T and the second gear 21.

Regarding the configuration of this gear train, an individual explanation will be omitted except that the reference numeral assigned to the gear train 39 is given an alphabetic letter.

The drive shaft 35.35L is movable in the axial direction of the support shaft 37.37L, and when the cassette 31.31L is not attached, the engagement pin 36.36L is connected to the free end 34a, 34aL of the actuation lever. It is retracted to a position where it does not engage with the cassette, and when the cassette is installed, it is moved to a position where both can be engaged. Further, when the cassette is installed and the uppermost recording paper is not at a predetermined height position, a recording paper level sensor (not shown) is activated to turn on the drive motor 2.

In FIG. 5, when the cassette 31 (see FIG. 4) is installed and its recording paper is not at a predetermined level, the drive motor 2 rotates in the direction of arrow a, causing the worm 3 to rotate in the same direction. The rotation of the worm 3 causes the sun gear 7 to rotate in the direction indicated by the arrow, and the swinging arm 10 that is frictionally coupled to the sun gear 7 rotates the sun gear 7 in the direction indicated by the arrow.
to the first position (see Figure 1), and move the second planetary gear 1 to the first position (see Figure 1).
5 is meshed with the first gear 19 and rotated in the direction of arrow d. That is, the rotation of the drive motor 2 is caused by the rotation of the worm 3.
．． Sun gear7. First planetary gear 13. The deceleration is transmitted to the drive shaft 35 via the second planetary gear 15 and the second transmission train 39, and the drive shaft 35 is rotated in the direction indicated by the arrow. Drive shaft 35
When rotates, the - part of the engagement pin 36 engages with the operating lever 34, causing it to swing in the direction of arrow i.

The swinging of the operating lever 34 swings the bottom plate push-up lever 32 in the direction of arrow i via the bottoming drive shaft 33. The bottom punch push-up lever 32 engages with the bottom plate 31a of the cassette 31 to raise it, and as shown in FIG. let When a recording paper level sensor (not shown) detects that the uppermost recording paper has been raised to a predetermined height, the power to the drive motor 2 is cut off and the motor is stopped.

When the cassette 31L is installed, the recording paper stored in it is not yet placed at a predetermined height position, so a recording paper level sensor (not shown) detects this and moves the drive motor 2 with an arrow. Give a signal to rotate in the opposite direction to a. When the drive motor 2 rotates in the opposite direction to arrow a, the worm gear 3 rotates the sun gear 7 to move the swing arm 10 to the second position explained in FIG. It meshes with the gear 21 and swings the bottom plate push-up lever 32L via the second wheel train 40. As shown in FIG. 4, when a recording paper level sensor (not shown) detects that the second highest recording paper has been raised to a predetermined position relative to the pickup roller 30L, the detection signal Drive motor 2 is stopped.

As described above, the two transducers 39 and 40 are selectively rotationally driven by the forward and reverse rotation of one drive motor 2.

Cassette 31, 3. ] r, recording paper is selectively fed out. Then, when the height of the stored recording paper decreases, the drive motor 2 is rotated in either the forward or reverse direction based on a signal from the recording paper level sensor that detects this. Depending on the rotational direction of the drive motor, the swinging arm 10 frictionally coupled to the sun gear 7 is moved to the first position (see FIG. 1).
Alternatively, the second planetary gear 15 or the first planetary gear 13 positioned at the second position (see FIG. 2) and supported by the second planetary gear 15 or the first planetary gear 13 is meshed with the first gear 19 or the second gear 21, and the -th gear 39
Alternatively, the second wheel train 40 is selectively driven to rotate.

In the illustrated embodiment, a worm gear is used as the sun wheel body, and a DC motor and a worm are used as the drive means for rotating the sun wheel in forward and reverse directions. However, a sun gear consisting of a spur gear is used instead of the worm gear, and a DC motor and a A pinion may also be used. Furthermore, the sun wheel, the planetary wheel, and the first wheel 19 and second wheel 21 to which the planetary wheel engages and disengages may each be constituted by a friction wheel other than a gear. Furthermore, in the illustrated embodiment, there are two planetary wheels, the first planetary gear 13 and the second planetary gear 15, but there may be only one planetary wheel. In this case, one planet wheel selectively engages the first wheel and the second wheel.

Effects of the Invention As described in -1-, according to the present invention, which selectively transmits the rotation of the drive means to two systems by simply switching the rotation of the solar wheel in the forward and reverse directions, extremely fi' l! .

It is possible to obtain a rotation transmission mechanism having a suitable configuration.

[Brief explanation of the drawing]

FIGS. 1 and 2 show one embodiment of the present invention, in which FIG. 1 is a front view showing an aspect in which the swinging arm is located at the first position, and FIG.
The figure is a front view showing the swing arm in the second position, FIG. 3 is a sectional view taken along the line A-A in FIG. FIG. 5 is a front view showing an example of the bottom plate pusher mechanism of the paper feeder according to item I to which the rotation transmission mechanism of the present invention is applied. 1゜... Drive means, 3... Worm, 5... Sun wheel, 11... Friction member, 13... First planetary wheel 1
3.14...Second planet wheel body 15.19...First wheel body, 21...Second wheel body.

Claims (1)

[Scope of Claims] A solar wheel rotatably provided in forward and reverse directions; a driving means for selectively driving the solar wheel to rotate in forward and reverse directions; and a driving means frictionally coupled to the sun wheel. , provided so as to be swingable about the central axis of rotation of the sun wheel between a first position and a second position depending on the rotational direction of the sun wheel that rotates when the driving means is rotated in forward and reverse directions; a rocking arm rotatably supported by the rocking arm, a planetary wheel that rotates while engaging with the sun wheel, and a planetary wheel that rotates due to forward rotation of the driving means. a first wheel body that is engaged with and rotated by the planetary wheel body when the swing arm is positioned at the first position according to the rotational direction; and a sun wheel that is rotated by reverse rotation of the drive means. and a second wheel body that is engaged with and rotated by the planetary wheel body when the rocking arm is swung from the first position to the second position following the direction of rotation of the body. When the driving means rotates in the forward direction, the swinging arm is swung to the first position by the frictional force between it and the sun wheel, thereby engaging the planetary wheel with the first wheel and rotating it. , when the driving means reversely rotates, the swinging arm is swung to the second position by the frictional force between it and the solar wheel, thereby engaging the planetary wheel with the second wheel and rotating it. A rotation transmission mechanism characterized by: