JPH08160831A - Driving force transmission mechanism and image forming apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] A conventional driving force transmission mechanism for intermittent driving uses a spring clutch or a toothless gear and controls the toothless gear by a flapper solenoid arranged outside the outer circumference thereof. The former aims to improve the increase in the installation area while making the manufacturing difficult and expensive. A flapper solenoid 1 is rotatably attached to a sleeve member 17, and a stopper collar member 9 and a toothless gear 4 are fixed to the member 17. When the solenoid 1 is on, the stopper portion 3 integral with the stopper collar member 9 is in contact with the flapper 2, and the drive gear 5 is idling. When the solenoid 1 is turned off, the restoring spring moves the flapper 2 and when the flapper 2 is disengaged from the stopper 3, the leaf spring 8 pivots the stopper collar member 9 clockwise, the drive gear 5 and the missing tooth gear 4 engage with each other, and the drive gear 5 causes The chipped gear 4 is rotated, and the driven sleeve member 17 is rotated. Simple and reliable operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive which simultaneously realizes a phase control function of a stop position for stopping a driven shaft that performs intermittent rotation at a fixed position and a clutch function of controlling transmission of driving force to the driven shaft. The present invention relates to a force transmission mechanism and an image forming apparatus using the mechanism.

[0002]

2. Description of the Related Art A first example is shown in FIGS. A sleeve member 17 which holds a driven shaft (not shown) in a hollow portion in a central hole so as to be rotatable integrally with the driven shaft, and a sleeve member 17 which has a hole in a central portion so as to rotatably hold the sleeve member 17 and to fix the same. The flapper solenoid 1, the gear 19 rotatably supported on the sleeve member 17, and integrally rotated with the sleeve member 17 at the time of connection, and the flapper solenoid fixed to the sleeve member 17 and energized to the flapper solenoid 1 are turned on. From the stop spring 20 of the torsion coil spring, the stopper collar member 9 having the stopper portion 3 that comes into contact with the portion 2 and stops at a specific phase, and the end portion of which is fixed to the gear 19 and the outer circumference of which is pressed against the stopper collar member 9. It is configured.

When the flapper solenoid 1 is de-energized, the flapper portion 2 and the stopper portion 3 are separated from each other by the restoring force of the spring 7 connecting the frame member 6 and the flapper portion 2. When the squeezing spring 20 presses the stopper collar member 9, the driving force is transmitted from the gear 19 to the stopper collar member 9 via the squeezing spring 20, and the driven shaft rotates. When the solenoid is turned on, flapper section 2
And the stopper portion 3 abut. When the squeezing spring 20 rotates in the diameter reducing direction, the driving force is not transmitted to the stopper collar member 9, and the driven shaft stops at a specific phase.

A second example is shown in FIG. Frame member 2
1, a drive shaft 22 fixed to a drive gear 5 and rotatably supported, and a flapper solenoid 1 are held,
A driven shaft 23 that rotates integrally with the toothless gear 4 is rotatably held. A hook 27 that is integral with the chipped gear 4 and a hook 26 that is integral with the frame member 21 are connected by a spring 27. When the flapper solenoid 1 is energized, the flapper section 2
Then, the stopper portion 25, which is integrated with the chipped tooth gear 4, comes into contact. At this time, the tooth-chipped gear 4 and the drive gear 5 are not in mesh with each other, and the rotational force for rotating the tooth-chipped gear 4 generated by the restoring force of the spring 27 is not so large as to separate the flapper portion 2 and the stopper portion 25 from each other. The missing tooth gear 4 stops at a specific phase. When the flapper solenoid 1 is de-energized, the stopper 25 moves to the flapper 2
The spring 7 that connects the frame member 6 and the flapper 2
Due to the restoring force, the flapper portion 2 and the stopper portion 25 are separated from each other. Due to the rotational force generated by the restoring force of the spring 27, the tooth-chipped gear 4 starts rotating in the direction of arrow A in FIG. 18, and by engaging with the drive gear 5, the drive gear 5 receives the rotational force and the driven force is applied to the driven shaft 23. Transmitted.

[0005]

Since the mechanism shown in the first example uses the spring clutch, the reliability of the clutch function for controlling the transmission of the driving force is not sufficient, and the size of the spring clutch is large. Has a problem in that the mechanism is expensive because machining is performed with high accuracy and variations in spring performance are reduced. The mechanism shown in the second example requires a large space, and since the positioning accuracy required between the gear and the flapper solenoid is high, the mechanism becomes expensive.

The present invention has a phase control function of the stop position of the driven shaft that rotates intermittently and a clutch function that controls the transmission of the driving force to the driven shaft, and the drive realized as a small unit structure at low cost. It is intended to provide a force transmission mechanism.

[0007]

A first invention of the present invention has a fixed flapper solenoid for rotatably holding a driven rotary member in a hole provided in a central portion thereof, and the driven rotary member and the driven rotary member. A stopper collar that has a toothless gear that is concentric with the drive rotation member and that meshes with the drive gear, and a stopper portion that contacts the flapper portion of the flapper solenoid when the energization of the flapper solenoid is turned on and that stops the toothless gear at a specific phase. A member to be driven, and a means for generating rotational force during stop for applying a rotational force to the driven body before and after the stopped state by the flapper and the flapper are integrally formed. It is a driving force transmission mechanism.

A second aspect of the present invention has a fixed flapper solenoid that rotatably holds a driven rotary member in a hole provided in a central portion, and is concentric with the driven rotary member and the driven rotary member. 1. A chipped tooth gear that meshes with a drive gear, and a stopper collar member that has a stopper portion that comes into contact with the flapper portion of the flapper solenoid to stop the chipped tooth gear at a specific phase when power to the flapper solenoid is turned off.
A driving force transmission mechanism characterized in that a driven rotating body which is physically provided and a stopping force generation means for applying a rotating force to the driven rotating body before and after the stopped state by the flapper are integrally formed. Is.

According to a third aspect of the present invention, there is provided a fixed flapper solenoid that rotatably holds a driven rotary member in a hole provided in a central portion, and the driven rotary member is driven concentrically with the driven rotary member. A stopper collar member having a toothless gear which meshes with the gear and a plurality of stopper portions which come into contact with the flapper portion of the flapper solenoid when the energization of the flapper solenoid is turned on and off to stop the toothless gear at a plurality of specific phases. And a driven rotary body that is integrally provided with a flapper, and a stop state rotational force generating means that applies a rotational force to the driven rotary body before and after the stopped state by the flapper are integrally formed. It is a force transmission mechanism.

According to a fourth aspect of the present invention, the stop-time rotational force generating means is a spring member that applies a spring force in the circumferential direction to the peripheral surface of the driven rotary member. The driving force transmission mechanism according to any one of the inventions.

According to a fifth aspect of the present invention, an idler gear in which the rotational force generating means during stop is concentrically supported by the driven rotary member and is rotatably supported on the driven rotary member, and meshes with the drive gear, and between the idler gear and the driven rotary member. The drive force transmission mechanism according to any one of the first to third inventions, characterized in that the drive force transmission mechanism is provided with a friction plate clutch provided in the above and a spring member for pressing between the friction plates.

A sixth invention of the present invention is an image forming apparatus characterized in that the driving force transmitting mechanism according to any one of the first to fifth inventions is connected to a pickup roller of a paper feeding mechanism.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 to 4 show a first embodiment.
Indicates. A driven rotating shaft is fitted and fixed in the center hole of the hollow sleeve member 17 (not shown).

The flapper solenoid 1 has a sleeve member 1
7 is rotatably fitted. The flapper solenoid 1 is fixed or is supported by a driven rotary shaft rotatably supported by the fixed portion via a sleeve member 17 and is fixed to a non-moving portion by a detent member. Flapper solenoid 1
Is attached to the frame member 6, and a restoring spring 7 is provided between the flapper portion 2 which is movable in the axial direction and the frame member 6. When the flapper solenoid 1 is de-energized, the flapper portion 2 is turned off. It is designed to be restored by the spring 7.

The toothless gear 4 and the stopper collar member 9 are fixed to the sleeve member 17. The stopper collar member 9 is provided with a stopper portion 3 which is abutted by the flapper portion 2 to prevent rotation when the flapper solenoid 1 is turned on and the flapper portion 2 is operated. The stopper collar member 9 has an oval shape as shown in FIG. 2, and in the state of FIG. 2, the major axis is oriented in the vertical direction. In this state, the missing tooth gear 4 is engaged with the only missing tooth portion 4a and the driving gear 5 which is supported and rotated at a fixed position, presses the stopper collar member 9 and urges it in the direction of the arrow in the figure. A leaf spring 8 is fixed to the frame member 6 of the flapper solenoid 1.

The sleeve member 17, the tooth-chipped gear 4, and the stopper collar member 9 provided with the stopper portion 3 are integrated and serve as a driven rotating body.

In this embodiment, the driven rotation angle is controlled by 360 degrees. When the flapper solenoid 1 is energized, the flapper portion 2 and the stopper portion 3 come into contact with each other as shown in FIG. At this time, the toothless gear 4 and the drive gear 5 are in a state where the teeth do not mesh with each other, and even if the drive gear 5 rotates counterclockwise in FIG. 2, the toothless gear 4 stops at a specific phase. When the electricity to the flapper solenoid 1 is turned off, the flapper portion 2 and the stopper portion 3 are separated from each other by the restoring force of the spring 7 that connects the frame member 6 and the flapper portion 2. This state is shown in FIGS. Due to the rotational force generated by the restoring force of the leaf spring 8,
The rotation starts in the direction of arrow B, and the rotation is transmitted from the drive gear 5 to the missing tooth gear 4 by engaging with the drive gear 5.
The sleeve member 17 rotates and the driving force is transmitted to a driven shaft (not shown). If the flapper solenoid 1 is energized again before the driven shaft rotates 360 degrees, 36
When it rotates 0 degrees, the flapper portion 2 and the stopper portion 3 again come into contact with each other, and the tooth-chipped gear 4 stops in the same phase as when it was previously stopped.

(Second Embodiment) FIGS. 5 to 8 show a second embodiment. This embodiment shows an example in which the member that gives a rotational force before and after the state where the missing gear is stopped, that is, the leaf spring 8 and the stopper collar member 9 of the first embodiment are changed and the rotation of the driven shaft is controlled by 360 degrees.

The flapper solenoid 1, the flapper portion 2, the stopper portion 3, the frame member 6, the restoring spring 7, the stopper collar member 9 and the sleeve member 29 have the same coupling relationship as in the first embodiment, and the rotating force generating means at the time of stop is provided. However, the first embodiment is different from the oval stopper collar member 9 and the leaf spring 8.

The drive gear 5 meshes with the missing tooth gear 4 in the same relationship as in the first embodiment. The sleeve member 29 is extended more than the sleeve member 17 of the first embodiment, and the sleeve member 2
An idler gear 28 having the same diameter as that of the tooth-chipped gear 4 is rotatably fitted in the extension portion of 9 and fixed to the tooth-chipped gear 4 by a friction plate 4A.
And the friction plate 28A fixed to the idler gear 28 is the spring 30.
It is pressed by. The spring 30 is inserted into the sleeve member 29 and has one end pressed against a spring seat 6 a extending from the frame member 6 and the other end pressed against an idler gear 28 to be compressed. The drive gear 5 engages with the idler gear 28.

When the flapper solenoid 1 is energized, the flapper portion 2 and the stopper portion 3 come into contact with each other. At this time, the tooth-chipped gear 4 and the drive gear 5 are not in mesh with each other, and the tooth-chipped gear 4 stops at a specific phase. This state is shown in FIG. 6 which is a side view of FIG. AA of FIG. 5 at this time
The gear pair in the arrow view is the same as that in FIG. 2 when borrowing the drawing. When the power supply to the flapper solenoid 1 is turned off, the flapper portion 2 and the skutter portion 3 integral with the missing tooth gear 4 are separated (FIG. 7). This state is shown in FIG. 8 which is a side view of FIG. At this time, the gear pair shown in the arrow BB of FIG. 7 is similar to that of FIG. The idler gear 28 rotatably supported by the sleeve member 29 is rotated by being engaged with the drive gear 5 while being pressed against the chipped gear 4 by the spring 30 via the friction plates 28A and 4A. Missing tooth gear 4
Of the idler gear 28 and the friction plate 4A integrally formed with the toothless gear 4 when the rotation of the toothless gear 28 is stopped, the rotational force is applied to the toothless gear 4 by the frictional force. Is transmitted. When the flapper portion 2 and the stopper portion 3 are disengaged from each other, the partly tooth-missing gear 4 starts rotating in the direction of the arrow in FIG. 8 and engages with the drive gear 5 so that the driven shaft (not shown) is engaged via the sleeve member 29. The driving force is transmitted to. If the energization to the flapper solenoid 1 is turned on again before the driven shaft rotates 360 degrees, the flapper portion 2 and the stopper portion 3 come into contact again when the flapper solenoid 1 rotates 360 degrees, and the missing tooth gear 4 is equal to that at the time of the previous stop. Stop at the phase.

In the first and second embodiments, the stopper portion 3 of the stopper collar member 9 and the flapper portion 2 are brought into contact with each other when the energization of the flapper solenoid 1 is turned on.
You may make it contact | abut the said stopper part 3 and the flapper part 2 when the said electricity supply is turned off.

(Third Embodiment) As a third embodiment, FIGS. 9 to 14 show an example in which the rotation of the driven shaft is controlled by 180 degrees.

In this embodiment, the tooth-missing portions of the tooth-missing gear 4 of Embodiment 1 are provided so as to be 180 degrees out of phase as indicated by reference numerals 4a and 4b, and the stopper collar member 9 is provided with a 180 degree out of phase stopper. Parts 3A and 3B are provided on the front and back. Therefore, when the flapper solenoid 1 is on, the stopper portion 3A
Can contact the flapper section 2, and when the flapper solenoid 1 is off, the stopper section 3B can contact the root of the flapper section 2. Other configurations are the same as those in the first embodiment.

When the flapper solenoid 1 is energized, the flapper portion 2 and the stopper portion 3A come into contact with each other.
At this time, the tooth-chipped portion 4a of the tooth-chipped gear 4 and the drive gear 5 are engaged, and the rotation of the drive gear 5 is not transmitted to the tooth-chipped gear 4 and the tooth-chipped gear 4 stops at a specific phase. This state is shown in FIGS. 9 and 10. When the flapper solenoid 1 is de-energized, the restoring force of the spring 7 that connects the frame member 6 and the flapper portion 2 separates the flapper portion 2 and the toothless gear 4 from the stopper portion 3A. This situation is shown in Figure 1.
1, shown in FIG. Leaf spring 8 fixed to flapper section 2
The toothless gear 4 starts to rotate in the direction of arrow B in FIG. 12 due to the rotational force generated in the stopper collar member 9 due to the restoring force, and the drive gear 5 and the toothless gear 4 engage with each other to rotate the sleeve member 17, The driving force is transmitted to a driven shaft (not shown). If the driven shaft rotates 180 degrees with the flapper solenoid 1 powered off,
The stopper portion 3B, which is on the back surface of the stopper collar member 9 which is an integral structure of the flapper portion 2 and the stopper portion 3A and is at a position where the phase in the rotation direction is 180 degrees, contacts. This state is shown in FIGS. 13 and 14. At this time, the toothless portion 4b of the toothless gear 4 and the drive gear 5 are engaged with each other, and the toothless gear 4 and the drive gear 5 do not mesh with each other. The partly tooth-missing gear 4 stops at a phase of 180 degrees from the previous stop position. When the flapper solenoid 1 is energized and kept energized, the stopper 3
B is separated from the flapper section 2 and starts rotating in the circumferential direction,
When rotated once, the flapper portion 2 and the stopper portion 3A again come into contact with each other, and the tooth-chipped gear 4 is stopped at the same phase as the previous stop position with the tooth-chipped portion 4a facing the drive gear 5. In the present embodiment, the electric power applied to the flapper solenoid 1 is turned on or off at a position where the gear with missing teeth 4 has rotated 180 degrees or more and 360 degrees or less after starting rotation, but the initial energization of the flapper solenoid is turned on or off. It is possible to specify the stop position at two positions within one rotation by selecting either of the above.

In this example, the phase is 180 degrees, but the number of toothless portions of the toothless gear 4 is 3 or more, and a stopper portion similar to the toothless portion is provided (provided at different positions in the radial direction).
The driven shaft can be stopped at an arbitrary rate during 0-degree rotation.

(Fourth Embodiment) As a fourth embodiment, an example in which the mechanism is used in the image forming apparatus will be shown. FIG. 15 shows the configuration of the image forming apparatus. A pickup roller 11 for picking up the recording sheets 10 one by one is provided on the leading end of the recording sheet 10 for recording the formed image. In the first to third embodiments, the pickup roller 11 is fitted and fixed to the driven shaft 13 that is fitted and fixed to the sleeve member 17 or 29, and the driven shaft 13 and the pickup roller 11 rotate integrally. Pickup roller 11
The half-moon missing portion 11A is not in contact with the recording sheet 10 and the flapper portion 2 and the stopper portion 3 are in contact with each other, and the toothless gear 4 and the drive gear 5 are not meshed with each other.

The scanner unit 14 processes the image signal and sends it to the image forming section 15 as an optical signal, and the image forming section 15
In, the known photosensitive drum 34 is uniformly charged, the latent image is formed by the scanning of the optical signal, and the development is performed. The pickup roller 11 starts to rotate in synchronism with the formation of the toner image by this development, and the uppermost one of the stacked recording sheets 10 is sent to the transport path 32. Although the leading edge of the recording sheet 10 is temporarily stopped by the registration roller 36, the pickup roller 11 continues to rotate, so the recording sheet 10 slightly sags, but the registration roller 36 rotates immediately, and the recording sheet 10 is exposed to the transfer roller 31 and the photosensitive roller. The toner image on the photosensitive drum 34 is transferred between the drums 34 and transferred onto the recording paper 10, and the recording paper 10 is then sent to the fixing unit 16 through the conveyance path 35. In the fixing unit 16, the unfixed toner image is fixed by heat and pressure and is discharged onto the tray 33.

By using this mechanism, it is possible to control the rotation of the driven shaft every 360 degrees or 180 degrees, and the recording paper can be printed without turning the driving force of the driving source of the driving gear 5 on and off. You can pick up at any time.

In each of the embodiments, the driven shaft is fitted and fixed to the sleeve member, but the sleeve member and the driven shaft may be integrated into a rotary shaft.

[0032]

The present invention has the following effects.

Each of the first to third inventions of the present invention has a fixed flapper solenoid that rotatably holds a driven rotary member in a hole provided in a central portion thereof, and the driven rotary member and the driven rotary member. It has a chipped gear that is concentric with the drive rotary member and meshes with the drive gear, and a stopper that stops the chipped gear by abutting the flapper of the flapper solenoid when the energization of the flapper solenoid is controlled. Since the driven rotating body integrally provided with the stopper collar member and the stop state by the flapper and the stopping rotational force generating means for applying the rotating force to the driven rotating body before and after the stop are integrally configured. Since the clutch mechanism is realized by the toothless gear, it is inexpensive and highly reliable in operation. Since the driven rotary member is configured to pass through the hole in the central portion of the flapper solenoid, the driving force transmission mechanism having the rotation phase control of the rotary shaft and the clutch function can be realized with a small unit.

The fourth invention of the present invention is simple in structure and inexpensive since the spring is used to urge the rotation of the driven rotary member from the stop in the first to third inventions.

According to a fifth aspect of the present invention, in the first to third aspects of the present invention, since the rotational biasing of the driven rotary member from the stop is performed by the friction clutch driven by the drive gear, the driven rotary member is driven. However, since the friction clutch rotates together with the rotation, the structure is simple, and the rotation force is uniform and the loss of drive transmission force is small.

The sixth invention of the present invention is suitable for applying each of the above inventions to a sheet feeding device of an image forming apparatus.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a vertical sectional view showing the operation of FIG.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a vertical sectional view of a second embodiment of the present invention.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a vertical sectional view showing the operation of FIG.

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a vertical sectional view of a third embodiment of the present invention.

FIG. 10 is a side view of FIG. 9.

FIG. 11 is a vertical cross-sectional view showing the operation of FIG.

FIG. 12 is a side view of FIG. 11.

FIG. 13 is a vertical cross-sectional view showing the operation of FIG.

FIG. 14 is a side view of FIG.

FIG. 15 is a vertical sectional view of an example in which the present invention is applied to an image forming apparatus.

FIG. 16 is a side view of a first conventional example.

FIG. 17 is a vertical cross-sectional view of a first conventional example.

FIG. 18 is a side view of a second conventional example.

[Explanation of symbols]

 1 flapper solenoid 2 flapper part 3 stopper part 4 missing tooth gear 5 drive gear 7 tension spring 8 leaf spring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G03G 15/00 516

Claims (6)

[Claims] 1. A fixed flapper solenoid that rotatably holds a driven rotary member in a hole provided in a central portion,
The driven rotary member, the toothless gear that is concentric with the driven rotary member and meshes with the drive gear, and when the energization of the flapper solenoid is turned on, it contacts the flapper portion of the flapper solenoid and stops the toothless gear at a specific phase. And a stopper collar member having a stopper portion for integrally forming a driven rotating body and a stopping state by the flapper and a stopping rotational force generating means for applying a rotating force to the driven rotating body before and after the stopped state. A driving force transmission mechanism characterized by being configured. 2. A fixed flapper solenoid that rotatably holds a driven rotary member in a hole provided in a central portion,
The driven rotary member, the toothless gear concentric with the driven rotary member and engaged with the drive gear, and the flapper solenoid abutting against the flapper solenoid when the energization to the flapper solenoid is turned off, the toothless gear is stopped at a specific phase. And a stopper collar member having a stopper portion for integrally forming a driven rotating body and a stopping state by the flapper and a stopping rotational force generating means for applying a rotating force to the driven rotating body before and after the stopped state. A driving force transmission mechanism characterized by being configured. 3. A fixed flapper solenoid for rotatably holding a driven rotary member in a hole provided in a central portion,
The driven rotary member, the toothless gear that is concentric with the driven rotary member and meshes with the driving gear, and a plurality of toothless gears that come into contact with the flapper portion of the flapper solenoid when energizing the flapper solenoid is turned on and off. Of a stopper collar member having a plurality of stopper portions for stopping in the phase A driving force transmission mechanism characterized by being integrally formed with a means. 4. The stop-time rotational force generating means is a spring member that applies a spring force in the circumferential direction to the peripheral surface of the driven rotating body, according to any one of claims 1 to 3. Drive force transmission mechanism. 5. An idler gear, in which stop-time rotational force generating means is concentrically supported by a driven rotary member and is rotatably supported on a driven rotary member, and meshes with a drive gear, and a friction plate provided between the idler gear and the driven rotary member. The driving force transmission mechanism according to claim 1, further comprising a spring member that presses between the clutch and the friction plate. 6. An image forming apparatus, wherein the driving force transmission mechanism according to any one of claims 1 to 5 is connected to a pickup roller of a paper feeding mechanism.