JPS61184249A - Rotation transmitting mechanism - Google Patents

Abstract

PURPOSE:To enable driving of different wheel trains, by a method wherein a worm is rotated forwardly and reversely by a driving means, and rotation of the driving means is selectively transmitted to first and second gears according to forward and reverse rotation of the worm. CONSTITUTION:When, with a driving motor 1 run forwardly in the direction of an arrow mark (a), a worm 5 is rotated in the said direction, a worm gear 6 is moved in the direction of an arrow mark (b) by means of the thrust of the worm 5 to be located in a first position to gear with a first gear 10. In which case, the gear is rotated for driving in the direction of an arrow mark (e) against a friction force between the worm gear and a support shaft 7. Meanwhile, when rotation of the driving motor 1 is shifted to reversing, the worm 5 is rotated in the direction shown by an arrow mark (c), and the worm gear 6 is reversed in the direction of an arrow mark (f). In which case, the force of a check spring 15 is exerted on the first gear 10, the worm gear 6 can be rotated, and is geared with a second gear 11 through movement of the swing arm 8 to rotate the gear 11 in a direction (g) for driving.

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 systems of transport trains, it is necessary to selectively rotate the drive motor provided for each 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 rotates a worm in forward and reverse directions using a driving means, and when the worm rotates forward, a worm gear that is constantly meshing with the worm moves to a first position by thrust and meshes with the first gear. When the worm is rotated and the worm rotates in the opposite direction, the worm gear moves to the second position by the thrust generated by the worm, meshes with the second gear, and rotates the worm. That is, the rotation of the driving means is selectively transmitted to the first gear and the second gear to selectively rotate them according to the forward and reverse rotation of the worm. The first gear and the second gear are connected to different wheel trains, respectively.

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

In FIGS. 1 and 2, reference numeral 1 designates a drive motor, for example, a DC motor, as a drive means whose rotation direction can be switched between forward and reverse directions, and is fixed to the substrate 4. A worm shaft 3 is connected and fixed to an output shaft 2 of the drive motor 1 . The worm shaft 3 includes a bearing portion 4a of the substrate 4,
4b so as to be rotatable. A worm 5 is fixed between bearing parts 4a and 4b of the worm shaft 3.

A worm gear 6 is engaged with the worm 5. This worm gear 6 is rotatably supported by a swing arm 8 via a support shaft 7. Appropriate friction applying means is provided between the worm gear 6 and the support shaft 7. The magnitude of the frictional force between the two will be described later. The swinging arm 8 is swingably attached to the base plate 4 by a shaft 9, and swings back and forth between a first position and a second position, which will be described later, while keeping the worm gear 6 engaged with the worm 5. That is, the worm gear 6 is provided so as to be movable in the axial direction of the worm 5 while meshing with the worm 5.

Then, the drive motor 1 rotates forward and the worm 5 moves toward the arrow a.
When rotated in the direction, the worm gear 6 has a support shaft 7.
The thrust of the worm 5 causes the swinging arm 8 to swing in the direction already shown by the arrow in FIG. 1, and the worm 5 moves in the direction shown by the arrow C. When the worm gear 6 is reversely rotated in the direction shown by , the thrust of the worm 5 causes the swinging arm 8 to swing, and is moved in the direction shown by the arrow d in FIG. 2 . That is, the frictional force between the worm gear 6 and the support shaft 7 causes the swing arm 8 to move without rotating the worm gear 6 when the worm gear 6 receives the thrust of the worm 5 without meshing with any gear. It is set to the extent that it can be oscillated.

A first gear 1 is provided on the substrate 4 along the axial direction of the worm 5.
0 and a second gear 11 are provided rotatably by support shafts 12 and 1'3, respectively. A worm gear 6 selectively meshes with these gears. Hereinafter, as shown in FIG. 1, the position where the worm gear 6 meshes with the first gear 10 will be referred to as the first position, and the position where the worm gear i meshes with the second gear 11, as shown in FIG. This is called the second position. The relative positions of the first gear 10 and the second gear 11 in the axial direction of the worm shaft are set as follows. The worm gear 6 meshes only with the first gear 10 in the first position shown in FIG. 1, and meshes only with the second gear 11 in the second position shown in FIG. In other words, the positions of both gears are set so that they do not mesh with the worm gear 6 at the same time.

A check spring 15 is fixed to the substrate 4, which engages with the first gear 10 and allows the gear to rotate in the direction of arrow e, but does not allow rotation in the opposite direction to arrow e. ing. Further, on the base plate 4, there is a non-return spring 16 which is engaged with the second gear 11 and allows the gear to rotate in the direction of arrow g, but does not allow rotation in the direction opposite to arrow g. Fixed. The non-return means for the first gear 1o and the second gear 11 is not limited to the above-mentioned spring, but any suitable means such as a one-way clutch may be used.

Further, a regulating pin 14 is provided on the substrate 4, and engages with a notch 8a formed in the free end of the swinging arm 8 to regulate the swinging of the swinging arm. 10.11
This prevents interference with the

Now, in FIG. 1, when the drive motor 1 rotates forward in the direction shown by arrow a and the worm 5 rotates in the same direction, the worm gear 6 moves in the direction of the arrow A by the thrust of the worm 5 and returns to the first position. When the first gear IO is positioned and meshed with the first gear IO, the frictional force with the support shaft 7 is overcome and the gear is driven to rotate in the direction of the arrow e. When the rotation direction of the drive motor 1 is switched to the direction opposite to the arrow a, the worm 5 rotates in the direction shown by the arrow C, and the worm gear 6 is rotated in the direction shown by the arrow f.
Try to rotate it in the opposite direction. However, since the non-return spring 15 acts on the first gear 10, the worm gear 6 cannot rotate, and the thrust force on the gear 6 causes the swinging arm 8 to move to the right in FIG. 1. The worm gear 6 released from meshing with the first gear 10 is
It does not rotate due to the frictional force between it and the support shaft 7, but moves to the right due to the thrust of the worm 5, and when it meshes with the second gear 11 in the second position, it overcomes the frictional force and the gear is rotated in the direction of arrow g.

As shown in Fig. 2, when the rotation direction of the worm 5 rotating in the direction of arrow C is switched to the direction of arrow a, the worm gear 6 in the second position rotates in the direction of arrow f (see Fig. 1). However, the check spring 1 is not attached to the second gear 11.
6 acting thereon, the thrust force thereon causes it to move toward the first position shown in FIG.

The first gear 10 and the second gear 11 are connected to two transmission trains (not shown), and each gear is connected to a worm gear 6.
When rotated by , it drives each transverse column in rotation.

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

FIG. 3 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 consists of an upper paper feeding mechanism 17, a lower paper feeding mechanism 18, and a pair of registration rollers 19 that receive recording paper selectively fed out from both mechanisms and convey it to a recording section (not shown). ing. The configuration of the upper paper feeding mechanism 17 and the lower paper feeding mechanism 18 includes a paper feeding path 20 that communicates with a pair of registration rollers 19.
．． 21 have the same length and are only arranged in upper and lower positions. Therefore, the structure of the upper paper feed mechanism 17 will be explained, and the structure of the lower paper feed mechanism 18 will be explained based on the structure of the upper paper feed mechanism 17. An alphabetic letter is added to the code indicating the configuration, and the explanation thereof is omitted.

The upper paper feeding mechanism 17 includes a feed roller 22 that rotates in the direction of the arrow to feed the recording paper in the paper feeding direction, and a feed roller 22 that is stopped or rotates in the opposite direction to the paper feeding direction and feeds paper other than the topmost paper. A flexible roller 23 that suppresses the advance of the recording paper S, a pickup roller 24 that sends out the stacked recording paper S toward both rollers 22 and 23, a cassette 25 that stores the recording paper S, and a cassette 25 that stores the recording paper S, Movable bottom plate 25a
a bottom plate push-up lever 26 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 24; and a bottom plate for swinging this lever. It consists of a drive shaft 27.

The cassette 25 is detachably attached to a cassette holder (not shown). When the bottom release push-up lever 26 is swung by the rotation transmission mechanism described later, the recording paper S
is raised to a predetermined position relative to the pickup roller 24. FIG. 3 shows a state in which both the upper and lower bottom plate push-up levers 26, 26L are raised.

The bottom plate drive shaft 27 and the bottom plate drive shaft 27L are selectively driven by a rotation transmission mechanism shown in FIG. In addition, in FIG. 4, the drive motor l explained in FIG.

Warm 5. Worm gear 6 and first and second gears 10.
1.1 are given the same reference numerals. Drive motor 1
is fixed to the side plate 36, and the swing arm 8 is swingably attached to the side plate 36 by a support shaft 37. Rocking -10= A regulating pin 38 is fixedly planted on the free end of the arm 8, and engages with a regulating hole 36a formed in the side plate 36 to regulate its swinging range. In this example, the worm gear 6 is formed substantially integrally with the small-diameter gear 39 and is supported by the swing arm 8 by a support shaft 7.

Therefore, in this application example, the small diameter gear 39 selectively meshes with the first gear 10 and the second gear 11.

An operating lever 28 is fixed to the bottoming drive shaft 27. The free end 28a of this lever 28 is positioned on the rotation trajectory of an engagement pin 30 fixed to the end surface of the drive shaft 29. The drive wheel 29 is rotatably supported by a support shaft 31, and has teeth 29a formed on its outer periphery. A small-diameter tooth portion 32a of the idle gear 32 meshes with the tooth portion 29a. The large diameter tooth portion 32b of the idle gear 32 is
It meshes with idle gear 33. idle gear 33
is meshed with the second gear 11. Below, second gear 1
The reduction gear train from 1 to the drive wheel 29 is referred to as a second gear train 34.

A first wheel train 35 consisting of a similar reduction gear train is also provided between the bottoming drive shaft 27L and the first gear 10.

Regarding the configuration of this gear train, individual explanations will be omitted except that the reference numeral assigned to the second wheel train 34 will be affixed with an alphabetic letter. However, in this first wheel train 35, another idle gear 40 is arranged between the first gear 10 and the idle gear 33L. Both wheel trains are rotatably supported by side plates 36.

The drive shafts 29, 29T= are the support shafts 31, 31 . L is movable in the axial direction, and when the cassette 25.25L (see Figure 3) is not installed, the engagement pin 30.30
L is retracted to a position where it does not engage with the free ends 28a, 28aL of the operating lever, and when the cassette is installed,
Both can be moved to a position where they can engage. 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 1.

In FIG. 4, when the cassette 25 (see FIG. 3) is installed and its recording paper is not at a predetermined level, the drive motor 1 rotates in the direction of arrow C, causing the worm 5 to rotate in the same direction. The rotation of the worm 5 moves the worm gear 6 to the second position (see FIG. 2), engages the small diameter gear 39 with the second gear 11, and rotates it in the direction indicated by the arrow. That is, the rotation of the drive motor 1 is caused by the rotation of the worm 5. The deceleration is transmitted to the drive wheels 29 via the worm gear 6 and the second wheel train 34, and the drive wheels 29 are rotated in the direction indicated by the arrow. When the drive shaft 29 rotates, one of the engagement pins 30 engages the actuating lever 2.
8 to swing it in the direction of the arrow. Swinging of the operating lever 28 causes the bottom plate push-up lever 26 to swing in the direction of the arrow via the bottoming drive shaft 27. The bottom removal push-up lever 26 engages with the bottom plate 25a of the cassette 25 to raise it, and lifts the recording paper stacked on the bottom plate to a predetermined position relative to the pickup roller 24, as shown in FIG. . 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 1 is cut off and the motor is stopped.

When the cassette 25L is installed, the recording paper stored in it is not yet placed at a predetermined height position, so the recording paper level sensor 13 (not shown) detects this and drives the paper. A signal is issued to rotate motor 1 in the direction opposite to arrow C. When the drive motor 1 rotates in the opposite direction to the arrow C, the worm gear 6 moves to the first position explained in FIG. oscillate.

As shown in FIG. 3, when a recording paper level sensor (not shown) detects that the uppermost recording paper has been raised to a predetermined position relative to the pickup roller 24L, the drive motor 1 is activated by the detection signal. be stopped.

As described above, the two transducers 34 and 35 are selectively rotationally driven by the forward and reverse rotation of one drive motor 1.

Recording paper is selectively fed out from the cassette 25.25L. Then, when the height of the stored recording paper decreases, the drive motor 1 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 worm gear 6 is positioned at a first position (see FIG. 1) or a second position (see FIG. 2), meshes with the first gear IO or the second gear 11, and - 14 = 1st. The second wheel trains 34 and 35 are selectively driven to rotate.

In addition, in the illustrated embodiment, the swinging arm 8 is provided as a means for movably supporting the worm gear 6, but the swinging arm 8 is provided so as to be slidable between the first position and the second position. The member may support the worm gear.

Effects of the Invention As described above, the present invention provides a rotation transmission mechanism with an extremely simple configuration, which selectively transmits the rotation of the drive means to two wheel trains simply by switching the rotation of the worm between forward and reverse directions. can be obtained.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a front view showing the worm gear in the first position, and FIG. 2 shows the worm gear in the second position. FIG. 3 is a front view showing an example of a two-stage cassette type paper feeding device to which the present invention is applied, and FIG. FIG.

Claims (1)

[Scope of Claims] A worm provided to be freely rotatable in forward and reverse directions, a driving means for selectively driving the worm to rotate in the forward and reverse directions, and a driving means that engages with the worm so that the worm rotates in the forward and reverse directions. a worm gear that is provided so as to be able to reciprocate along the axial direction of the worm between a first position and a second position depending on the rotational direction of the worm due to the thrust when the worm rotates in the forward direction; When the worm is placed in the first position, the first gear meshes with and rotates the worm gear, and the worm rotates in the opposite direction, causing the worm gear released from the mesh with the first gear to move to the second position. When positioned, the second gear meshes with and rotates the worm gear, the first gear meshes with and rotates with the worm rotating in the forward direction, and the second gear meshes with and rotates with the worm rotating in the opposite direction, each rotating in the opposite direction. When the worm rotates in the forward direction, the worm gear is placed in the first position by the thrust of the worm, causing the first gear to rotate, and when the worm rotates in the reverse direction, the worm gear is rotated. A rotation transmission mechanism characterized in that it moves to a second position by thrust from a worm, meshes with a second gear, and rotates the second gear.