JP2003312868A - Drive control device, paper feeding device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive control device minimized in vibration to reduce noise with a simple structure. <P>SOLUTION: In this drive control device for transmitting a rotation from a drive source to a rotating shaft at a prescribed timing, a viscous agent G for giving braking force to a second toothless gear is retained in the cylindrical sliding surfaces 6a between a fist toothless gear 14 and the second toothless gear 6. Accordingly, the impact in the meshing of the second toothless gear is reduced, and the vibration is thus minimized to reduce the noise. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device, and more particularly to a drive control device used in a sheet feeding device provided in an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine or a printer is provided with a sheet feeding device, and the sheet feeding device uses a drive control device for driving and controlling a feeding roller. There is.

As a drive mechanism of the sheet feeding device, a toothless gear for intermittently transmitting rotation from a drive source to a sheet feeding rotating shaft in order to intermittently feed a sheet at a predetermined timing. The drive control device used is known.

On the other hand, in recent years, there is a trend to reduce the cost of small printers, etc., the components are simple, and the starting rotation when connecting the toothless gear to the drive transmission gear at the start of drive transmission. The development of a drive source and an image that does not affect the image has been awaited because the impact of the rotating shaft due to the force is small.

In order to solve the above problems, it has been proposed to obtain a necessary and sufficient starting force with a mechanism other than a spring provided on the back side of an intermediate plate and a cam of a feeding roller section. There is a publication of 10-153247. According to the proposal, a drive control device having a simple structure of a lock mechanism for a toothless gear, a small number of parts, good production efficiency, and excellent drive control accuracy is provided. Attempts are being made to provide a sheet feeding apparatus having high productivity and a feeding roller that rotates stably, and further, an image forming apparatus having high sheet feeding accuracy and high image forming accuracy.

12 to 15 are views for explaining the structure and operation of a conventional drive control device. FIG. 12 is an exploded view of a conventional drive control device. FIG. 13 is a side view of a conventional drive control device. FIG. 14 is a detailed view of a conventional paper feeding drive device stationary unit. FIG. 15 is a side view for explaining the operation of the conventional drive control device.

According to the same proposal, as shown in FIG. 12, in a drive control device for transmitting rotation from a drive source (not shown) to a rotary shaft 312 at a predetermined timing, a drive gear 304 connected to the drive source. A first tooth-missing gear 314 fixed to the rotating shaft 312 and provided at a position where it can mesh with the drive gear 304, and rotatably supported with respect to the rotating shaft 312. A second partly tooth-missing gear 306 provided at a position capable of meshing with the first partly tooth-missing gear 3
First stationary means 316 for stationary the first tooth-chipped gear 314 with the tooth-chipped portion 14 facing the drive gear 304.
a 317a (see FIG. 14) and the second tooth-chipped gear 306 as a second stationary means for keeping the second tooth-chipped gear 306 stationary while the tooth-chipped portion of the second tooth-chipped gear 306 faces the drive gear 304. When the claw portion 313 provided on the solenoid 307 and the second tooth-chipped gear 306 and the second stationary means are released from the stationary state, the second tooth-chipped gear 306 is moved to the drive gear 30.
4, the rotation means 310 for rotating so as to mesh with the gear 4, and the rotation of the second toothless gear 306 release the first stationary means, rotate the first toothless gear 314, and cause the drive gear 304 to rotate. The first partly tooth-missing gear 3 which is the interlocking means for meshing
Key portion 312a provided on the rotary shaft 312 to which 14 is fixed, and the groove portion 30 provided on the second toothless gear 306.
5 and.

Therefore, in the drive control device constructed as described above, the second tooth-chipped gear 306 is rotated by the rotating means 310.
After the second tooth-chipped gear 306 rotates, the rotational force is transmitted to the first tooth-chipped gear 314 by the interlocking device. At this time, since the second tooth-chipped gear 306 is not directly fixed to the rotary shaft 312, no load is applied from the rotary shaft 312, and the second stationary means is released with a small force.

Further, since the load applied to the rotary shaft 312 to which the first tooth-chipped gear 314 is fixed at the start of rotation is not transmitted to the second tooth-chipped gear 306, the second tooth-chipped gear 306 is driven by the drive gear 304. No force is applied to the drive gear 304 when meshing with the drive gear 304, and an increase in the rotational speed of the drive gear 304 is prevented.

The second stationary means engages with the claw portion 313 provided on the second tooth-chipped gear 306 and engages with the locking portion according to whether the second tooth-chipped gear 306 is operated or not, to operate the second tooth-chipped gear. And a solenoid 307 for switching between a stationary state and a disengaged stationary state in which the locking portion is not engaged.

Thus, the second tooth-chipped gear 306 can be reliably stopped by a simple mechanism.

The rotating means 310 is a biasing means that is bridged between the first tooth-chipped gear 314 and the second tooth-chipped gear 306, and the rotating means 310 moves the stationary second tooth-chipped gear 306. The drive gear 304 is biased in a direction in which it meshes with the drive gear 304.

As a result, the second partly tooth-chipped gear 306 receives an urging force in the rotational direction by the rotating means 310 which is an urging means while it is stationary, and when the stationary state is released, it is rotated by the urging force. First, after meshing with the drive gear 304 and rotating the second tooth-chipped gear 306, the interlocking means starts rotation of the first tooth-chipped gear 314.

That is, the rotational force of the second tooth-chipped gear 306 is generated by the rotating means 31 provided between the second tooth-chipped gear 306 and the first tooth-chipped gear 314.
Since the urging force is 0, the overall configuration of the device can be downsized,
It has a small number of parts, is easy to assemble, and is considered to improve production efficiency.

Since the rotating means 310 which is also a biasing means is simple, a compression spring is often used.

As a result, the first toothless gear 314 and the second toothless gear 314
The biasing means is arranged without taking a space between the tooth-chipped gear 306 and the tooth-chipped gear 306.

The interlocking means and the first tooth-chipped gear 314 and the first tooth-chipped gear 314 are arranged to mesh with the drive gear 304 in the same phase as the second tooth-chipped gear 306 when rotating the first tooth-chipped gear 314. The relative position with respect to the two-toothed gear 306 is restricted.

As a result, when the second tooth-chipped gear 306 starts to rotate by using the rotating means 310 as the urging means, the rotational force is transmitted to the first tooth-chipped gear 314 through the interlocking means, and the phase thereof becomes the same as that of the second tooth-chipped gear 306. In the aligned state, that is, in the state where the ridges and valleys of each other and the valleys of the valleys are aligned, the second toothless gear 30
6 meshes with the drive gear 304, the first toothless gear 314
Also meshes smoothly with the drive gear.

The interlocking means has a key 312a that follows the rotation of the rotary shaft 312, and a groove 305 that is provided in the second toothless gear 306 and into which the key 312a is inserted. The size of the key 312a is set so that the second tooth-chipped gear 306 is rotatable within a predetermined range relative to the rotary shaft 312.

With this, the rotary shaft and the first tooth-chipped gear 314 and the second tooth-chipped gear 306 are reliably interlocked with a simple structure.

A rotary shaft 312 is attached to the first toothless gear 314.
It is also attempted to provide a shaft portion for inserting and fixing the second toothless gear 306 rotatably with respect to the shaft portion.

As a result, the fitting length between the first tooth-chipped gear 314 and the rotary shaft 312 can be made long without changing the width of the entire apparatus.

As described above, by transmitting the rotation of the driving source at the predetermined angle to the rotating shaft 312 of the feeding roller 301 at a predetermined timing, the sheet supported by the sheet supporting means is moved by the feeding roller 301. In the sheet feeding apparatus for sending out, the drive gear 304 connected to the drive source
And the drive gear 304 fixed to the rotating shaft 312.
A first partly tooth-missing gear 314 provided at a position capable of meshing with
A second tooth-chipped gear 306, which is rotatably supported on the rotation shaft 312, is provided at a position where it can mesh with the drive gear 304, and a tooth-chipped portion of the first tooth-chipped gear 314 is the drive gear. A first stationary means for stopping the first tooth-chipped gear 314 in a state of facing the 304 gear, and a second tooth-chipped gear 306 in a state of the tooth-chipped portion of the second tooth-chipped gear 306 facing the drive gear 304. Second stationary means for stationary
When the stationary means is released, the second tooth-chipped gear 30
With the rotation of the rotating means 310 for rotating 6 so as to mesh with the drive gear 304 and the rotation of the second toothless gear 306, the first stationary means is released, and the first toothless gear 31
4 is rotated and interlocking means for meshing with the drive gear 304 is being implemented.

As described above, there is being provided a sheet feeding apparatus which has a high production efficiency and which does not give acceleration to the drive gear 304 and can stably feed the sheet at the start of feeding.

[0025]

However, in the case of the prior art as described above, the second
Since the tooth-chipped gear 306 is biased by the spring 310 against the first tooth-chipped gear 314, the following problems exist.

First, the urging force of the spring 310 is the first
The second tooth-chipped gear 306 is driven by the drive gear 30 against the frictional resistance between the surfaces of the tooth-chipped gear 314 and the second tooth-chipped gear 306.
It is indispensable to bring them into contact with No. 4, and it is necessary to have a margin even for an increase in frictional force due to dust or the like. If the loss of the urging force becomes large, it becomes impossible to transmit the driving force, which causes a paper feed failure.
It cannot be lowered below a certain level.

For these reasons, it is unavoidable that an impact noise is generated when the toothless gear meshes with the drive gear.

On the other hand, from the viewpoint of an image forming apparatus, it is known that the smaller the impact when the second tooth-chipped gear 306 meshes with the drive gear 304, the better.

The drive gear 304 with which the toothless gear meshes is connected to a gear train for driving transfer / fixing. Therefore,
When a shock is applied to the gear train, it is reflected as a blur of the image. Alternatively, the paper feed roller 301 is connected to the paper feed shaft that is connected to the first toothless gear 314, and the paper feed roller 301 may momentarily over-feed the paper. This is because it can be one of the factors that cause the paper to be suddenly fed into the nip and cause a jam.

Further, the impact noise generated when the toothless gear is biased against the drive gear 304 and jumps in has caused a great influence on the texture of the entire product.

Such a problem has been common to drive control devices in general. Therefore, it is a drive control device for transmitting the rotation from the drive source to the rotary shaft at a predetermined timing, and an impact on the drive source is generated at the start of rotation of the rotary shaft and at the end of one rotation operation. The development of devices and means that would not affect the sound quality was awaited.

The present invention was made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a drive control device having a simple structure, low vibration and low noise, and a seat using the same. It is to provide a feeding device and an image forming apparatus.

[0033]

In order to achieve the above object, according to the present invention, a drive control device for transmitting rotation from a drive source to a rotary shaft at a predetermined timing is connected to the drive source. And a first partly toothed gear fixed to the rotating shaft and provided at a position where it can mesh with the drive gear, and rotatable with respect to the rotating shaft or the first partly toothed gear. And a second tooth-chipped gear provided at a position capable of meshing with the drive gear and a tooth-chipped portion of the first tooth-chipped gear facing the drive gear. And a second stationary means for stationary the second partially toothed gear in a state where the partially toothed part of the second partially toothed gear faces the drive gear. When the gear is released, the second toothless gear is rotated so as to mesh with the drive gear. The rotating means; and the interlocking means for releasing the first stationary means, rotating the first toothless gear, and meshing with the drive gear in association with the rotation of the second toothless gear. A viscous agent that gives braking force to the toothless gear,
The first partly tooth-chipped gear and the second partly tooth-chipped gear are held in a fitting portion.

Alternatively, in the drive control device for transmitting the rotation from the drive source to the rotary shaft at a predetermined timing,
A drive gear connected to the drive source and a first gear fixed to the rotary shaft and provided at a position where the drive gear can mesh with the drive gear.
A tooth-chipped gear, a second tooth-chipped gear that is rotatably supported with respect to the rotation shaft or the first tooth-chipped gear, and is provided at a position that can mesh with the drive gear; A first stationary means for stopping the first toothless gear with the toothless portion of the gear facing the drive gear; and a first stationary means for holding the toothless portion of the second toothless gear facing the drive gear. A second stationary means for stopping the two-toothed gear, a rotating means for rotating the second partially-toothed gear so as to mesh with the drive gear when the second stationary means is released from the stationary state; Along with the rotation of the two tooth-chipped gears, the first stationary means is released, the first tooth-chipped gears are rotated, and the interlocking means that meshes with the drive gear,
A side surface of a cylindrical portion provided on the second tooth-chipped gear and concentric with the rotation axis, and the rotation axis or a cylinder provided on the first tooth-chipped gear and concentric with the rotation axis. A viscous agent that applies a braking force to the second partially toothed gear is held in at least one of the gaps with the side surface of the portion.

Here, the viscous agent may be any one that exerts a braking force such as oil or grease that attenuates the force applied to the second toothless gear by the rotating means. The range may be such that the second tooth-chipped gear can rotate and the viscous agent can stay in the sliding portions or the gaps between the members.

According to the above structure, the impact sound generated when the second tooth-chipped gear is urged into the drive gear by the urging means such as the spring is generated by the viscous agent.
Since the urging force additionally applied to the second partially toothed gear is appropriately attenuated, the impact noise is reduced. Further, as compared with the conventional configuration, a fitting portion between a cylindrical surface provided with a viscous agent such as oil or grease on the rotating shaft or the first tooth-chipped gear and a cylindrical surface provided on the second tooth-chipped gear. Since the modification is only to dispose in a sliding portion or a gap, it is possible to provide a low-noise drive device without impairing the conventional features of a simple structure and a small number of parts.

If the diameter of the rotary shaft or the cylindrical portion of the first tooth-chipped gear is D1 and the diameter of the second tooth-chipped gear cylindrical portion is d1, then 0.1 [mm] ≦ | d1- It is preferable that D1 | ≦ 0.5 [mm].

Within such a range, the biasing force applied to the second partially toothed gear is appropriately attenuated, and the viscosity coefficient of the viscous agent capable of staying in the fitting portion or the gap is set. The range expands. Therefore, the range of selection of the material for the viscous agent is widened, and the desired effect can be maintained for a long period of time even with respect to the change in the viscosity of the viscous agent over time.

At least two groove portions extending in the axial direction of the rotating shaft are provided on at least one of the rotating shaft, the side surface of the cylindrical portion of the first partly toothed gear or the side surface of the cylindrical portion of the second partly toothed gear. However, it is preferable that the plurality of groove portions are arranged at substantially equal intervals.

With this structure, the rotating shaft, the first
In the side surface of the cylindrical portion of the tooth-chipped gear or the side surface of the cylindrical portion of the second tooth-chipped gear, at the mutual contact surfaces, the viscous agent,
The uniform distribution in the circumferential direction gives an equal mechanical action. That is, by having at least two groove portions extending in the axial direction of the rotating shaft and arranging the plurality of groove portions at substantially equal intervals, the viscous agent filled in the groove portions is disposed with respect to the center of the rotating shaft. Gives a uniform sliding resistance,
Rotational unevenness can be suppressed. Therefore, it is possible to provide a low-noise drive device without impairing the simple configuration and the small number of parts.

The shape of the groove extending in the axial direction is not particularly limited, but in the case of extending parallel to the axial direction,
It may be provided obliquely with respect to the axial direction, or may be provided in a screw shape.

A sheet feeding device including the drive control device and a rotation shaft connected to the drive control device, and a feeding roller for feeding the sheet through which the rotation shaft passes. By applying it, it is possible to stably feed the sheet. In addition, by applying the drive control device to an image forming apparatus including the sheet feeding device and an image forming unit that forms an image on the sheet fed from the sheet feeding device, a stable sheet is obtained. Can be delivered,
It is possible to provide an image forming apparatus having high image forming accuracy and high production efficiency.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be exemplarily described in detail below with reference to the drawings. However,
The dimensions, materials, shapes, relative positions, etc. of the components described in the embodiments of the present invention are not intended to limit the scope of the present invention to them unless otherwise specified. Absent.

(First Embodiment) A schematic configuration of a drive control device according to a first embodiment will be described with reference to FIGS.

FIG. 1 is a sectional view showing a fitting portion of a toothless gear according to this embodiment. FIG. 2 is a partially exploded perspective view of the sheet feeding device including the drive control device according to the present embodiment. FIG. 3 is a side view of the sheet feeding device including the drive control device according to the present embodiment. FIG. 4 is a side view of the vicinity of the second partially toothed gear according to the present embodiment. FIG. 5 is a cross-sectional view of the locking portion of the first tooth-chipped gear according to the present embodiment. FIG. 6 is a side view of the drive control device according to the present embodiment.

First, with reference to FIGS. 2 and 3, a sheet feeding device provided with the drive control device according to the present embodiment will be described.

The feeding roller 1 for feeding the sheet 2 from the cassette has a half-moon shape and is fixed to the rotating shaft 12. The flange 1 a is formed integrally with the holder portion of the paper feed roller 1 and is arranged on both sides of the feed roller 1. The middle plate 16 is the feeding direction of the sheet 2 (direction of arrow in FIG. 2).
It is swingably supported on the upstream side as a fulcrum and is biased toward the feeding roller 1 by a coil spring 16b.

Further, a cam 17 is provided on the rotary shaft 12 and the intermediate plate 1
The convex portions 16a are fixed to 6 and are arranged so as to abut each other. Then, as the rotating shaft 12 rotates, the cam 17 pushes down the convex portion 16a, and the sheet 2 is fed at the position where the cutout portion of the sheet feeding roller 1 faces the sheet 2 stacked on the intermediate plate 16. 1 and the flange 1a.

This improves the operability when the sheet 2 is taken out of the middle plate 16 or replenished.

In FIG. 2, the separation pad 8 is biased toward the feeding roller 1 by the coil spring 8a, and separates the sheets 2 on the intermediate plate 16 fed by the feeding roller 1 one by one. The separated sheet 2 is delivered from the paper feed roller 1 toward the pair of transport rollers 3 and is delivered to the main body of the image forming apparatus (not shown).

In such a structure, if the intermediate plate 16 is still raised during sheet feeding, the sheet 2 to be fed is separated from the separation pad 8 and the flange portion 1 of the sheet feeding roller 1.
The sheet 2 is not only sandwiched by the sheet a and is also sandwiched by the sheet 2 stacked on the intermediate plate 16 and the sheet feeding roller flange portion 1a, which increases the load applied to the sheet 2. As a result, there is a problem that the load on the drive system is increased. Therefore, when the sheet 2 reaches the conveying means on the downstream side, the intermediate plate 16 is lowered by the cam 17 to reduce the load applied to the sheet.

The sheet feeding roller flange portions 1a are provided on both sides of the feeding roller 1 with a diameter slightly smaller than the diameter of the arc of the feeding roller 1.

According to this structure, the flange portion 1a is made of a material having a good slidability, so that the sheet 2 can be easily pulled out even if a jam occurs in a state where the sheet 2 exists at a position facing the feeding roller 1. The jam processing is relatively easy.

FIG. 5 is a sectional view of the engaging portion of the first tooth-chipped gear 14 according to the present embodiment. According to FIG. 5, the cam 1
A concave portion 17a is formed in the rotary shaft 1 and the convex portion 16a of the intermediate plate 16 is engaged with the concave portion 17a.
2 and the paper feed roller 1 are kept stationary.

Next, the drive control device for the paper feed roller of the present invention will be described.

In FIG. 2, a drive control device for transmitting drive control to the paper feed roller 1 is provided at the end of the rotary shaft 12, and a drive gear connected to a drive source such as a motor (not shown). 4 and a first tooth-chipped gear 14 and a second tooth-chipped gear 6 that are provided at positions that mesh with the drive gear 4.

FIG. 6 is a side view of the drive control device according to the present embodiment. In order to simplify the description, a part of the second partly tooth-chipped gear 6 is shown as cut away.

The first tooth-chipped gear 14 has the tooth-chipped portion facing the drive gear 4 and the recess 17a of the cam 17 described above.
So that the convex portion 16a of the middle plate 16 is engaged with the rotary shaft 12
Is attached to. That is, the concave portion 17a and the convex portion 16a serve as a first stationary means for stationary the first toothless gear 14.

On the other hand, the second tooth-chipped gear 6 is the first tooth-chipped gear 1
A pair of protrusions 14d arranged on the upper surface of the rotary shaft 12 with a phase angle of α ° with respect to the central axis of the rotating shaft 12
The engagement stopper 6d provided on the partly tooth-chipped gear 6 is loosely fitted to be attached so as to be rotatable within a predetermined range.

The second tooth-chipped gear 6 is provided with a claw portion 13, and the claw portion 13 is locked by the solenoid 7. At this time, both of them are arranged at positions where the rotation thereof is stopped, with the toothless portion of the second toothless gear 6 facing the drive gear 4. That is, the claw portion 13 and the solenoid 7 act as a second stationary means for stationary the second partially toothed gear 6.

On the other hand, the spring 10 functions as a rotation biasing means, and both ends thereof are fixed to the first tooth-chipped gear 14 and the second tooth-chipped gear 6. An elastic force is generated by the relative positional relationship between the first tooth-chipped gear 14 and the second tooth-chipped gear 6.

Since both the first partly tooth-chipped gear 14 and the feeding roller 1 as the conveying means are fixed on the rotary shaft 12, the feeding roller 1 is rotated together with the first partly tooth-chipped gear 14. To be done.

In FIG. 6, the tooth-chipped portions of the first tooth-chipped gear 14 and the second tooth-chipped gear 6 are in the overlapping state, and both are in the non-engagement state with the drive gear 4.

The spring 10 as the urging means generates a constant elastic force in the contracting direction in this state, but the first tooth-chipped gear 14 and the second tooth-chipped gear 6 resist this elastic force. It is stationary.

The first tooth-chipped gear 14 is fixed to the cam 17 via the rotary shaft 12 as shown in FIG. 2, and the cam 17 serves as the first stationary means as shown in FIG. The stable state is maintained with the convex portion 16a of the intermediate plate 16 fitted in the concave portion 17a. Further, the reason why the second partially toothed gear 6 is stationary is that the solenoid 7 in the non-energized state which is the second stationary means and the claw portion 13 which is the locking portion are locked.

From this state, when the solenoid 7 is energized to be in the unlocked state, only the second tooth-chipped gear 6 enters the drive gear 4.

At this time, with the cylindrical sliding surface 14a, which is a cylindrical portion concentric with the rotating shaft 12 of the first tooth-chipped gear 14, as the rotational axis, the second tooth-chipped gear 6 uses the cylindrical sliding surface 6a as the cylindrical sliding surface. 14a and the driving gear 4 while substantially fittingly sliding.

FIG. 1 is a sectional view of a fitting portion between the first tooth-chipped gear 14 and the second tooth-chipped gear 6. As shown in the figure, the cylindrical sliding surface 14a provided on the first tooth-chipped gear 14 is used as a rotation axis, and the second tooth-chipped gear 6 is installed with the cylindrical sliding surface 6a as an opposing sliding surface. It shows the situation.

G is oil or grease as a viscous agent. As shown in FIG. 6, the gap between the cylindrical sliding surface 14a of the first tooth-chipped gear 14 and the cylindrical sliding surface 6a of the second tooth-chipped gear 6 is filled so that the grease G is retained. As a result, a viscous resistance force that opposes the urging force of the spring 10 is generated, and when the second partially toothed gear rushes into the drive gear 4, it is prevented from impacting.

Here, as the viscous agent, any agent such as oil or grease may be used as long as it exerts a braking force that attenuates the force applied to the second toothless gear by the spring 10, and the viscosity coefficient is The range may be such that the second tooth-chipped gear can rotate and the viscous agent can stay in the sliding portions or the gaps between the members.

Typical oil-like or grease-like viscous agents that can be used in the present embodiment are so-called silicone oil, paste-like grease, and the like, which have physical properties that exert a wide viscous resistance. I wish I had it.

As described above, the sheet feeding device using the drive control device according to the present embodiment can smoothly and efficiently drive the feeding roller 1 with a very simple structure. It is possible to reduce the impact of the tooth-missing gear on the drive gear, and reduce the vibration and noise without damaging the drive mechanism and the paper feed mechanism that can easily perform jam processing and sheet refilling. It is possible.

(Second Embodiment) FIG. 7 shows a sheet feeding apparatus according to a second embodiment of the present invention.
In this embodiment, the gap between the cylindrical sliding surfaces of the first tooth-chipped gear and the second tooth-chipped gear is optimized.

In the first embodiment, the back surface of the press-fitting fixing portion with the shaft 12 is the sliding surface with the second partially toothed gear 6, but in the present embodiment, the sliding surface is the first missing portion. Separately from the cylindrical wall portion, which is the back surface of the press-fitting fixing portion, to the toothed gear, the first
A description will be given based on a configuration in which a cylindrical surface 114f concentric with the rotation center of the tooth-chipped gear is provided and is arranged so as to be fitted and slid with the opposed cylindrical surface 106f on the second tooth-chipped gear.

FIG. 7 is a front view and a rear view of the first tooth-chipped gear 114 and the second tooth-chipped gear 106 according to the present embodiment. In this configuration, the first toothless gear 114 and the rotary shaft 12 are press-fitted in the central cylindrical portion 114a. At this time, the first tooth-chipped gear 114 and the second tooth-chipped gear 106 are fitted and slid on the cylindrical surfaces 114f and 106f that are concentric with the rotating shaft 12 provided on each of them. Therefore, the shaft press-fitting does not affect the sliding resistance change due to the outer diameter expansion.

Further, the groove 106h in the figure also serves as a lid, and is effective in preventing pressure fluctuation due to inclusion of grease and mixing of dust.

FIG. 8 shows a concrete shape of the first tooth-chipped gear 11
4 is a cross-sectional view showing the fitted state of the fourth toothless gear 106 and the second toothless gear 106 passing through the center of the rotary shaft 12.

D1 and d1 in FIG. 8 represent the diameter of the cylindrical surface into which the first tooth-chipped gear 114 and the second tooth-chipped gear 106 are fitted, respectively.

D1 and d1 in FIG. 8 are set to 0.1 [mm] ≦ | d1−D1 | ≦ 0.5 [mm], and silicon-based grease of 20 to 20 is used as the oil-like or grease-like substance G. 40 [mg] is arranged.

In the above range, the grease can be added to the first tooth-chipped gear 14 and the second tooth-chipped gear 6,
The damper effect is most exerted when the pressure of the biasing spring is 50 gf (0.49 N).

At this time, it is obvious that the strength of the damper performance can be controlled by moving the fitting diameter and the grease G application amount closer to or farther from the above range.

Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. It should be noted that this drawing is drawn based on the relationship and shape between the first tooth-chipped gear 14 and the second tooth-chipped gear 6 of the second embodiment. The one-toothed gear 14 is press-fitted into the rotary shaft 12 and can be applied as it is to the fitting relationship when the expansion is taken into consideration.

(Third Embodiment) FIGS. 9 and 10 show a drive control device according to a third embodiment of the present invention.

In this embodiment, the groove 21 is formed on the mating sliding surface of the first tooth-chipped gear 214 or the second tooth-chipped gear (not shown).
This is an example in which 4 g is arranged.

FIG. 10 is a front view of the first tooth-chipped gear 214 as viewed from the cylindrical sliding surface side. In the figure, the groove 214g is the rotary shaft 12.
An example showing an example of arranging at a position radially divided into eight equal parts with respect to the center will be shown. That is, when the oil-like or grease-like substance that is a viscous agent is applied to the cylindrical sliding surfaces of the first and second partially toothed gears to intervene, the cylindrical surfaces are assigned at equal circumferential angles. For example, by accumulating grease G in the groove, it is possible to prevent a minute inclination of the cylindrical surface due to uneven coating and non-uniformity of viscous resistance.
This ensures a stable rotation performance of the toothless gear.

Therefore, the same effect can be obtained even if the groove portion is provided not on the first tooth-chipped gear but on the second tooth-chipped gear 206 side.

Further, in order to make it easy to mold the shape of the oil pool, the groove is shown parallel to the center of the rotation axis, but it is a dent shape, a spiral groove or hole, or a direction perpendicular to the rotation axis. It can be easily inferred that a similar effect can be obtained with the groove shape.

Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. Further, in the first embodiment, the enclosing surface is omitted in order to make it easier to see the relationship between the first tooth-missing gear / second tooth-missing gear sliding surface and the grease. The same effect can be obtained by forming the cover portion as the enclosing surface integrally with or separately from one of the first tooth-chipped gear and the second tooth-chipped gear.

(Fourth Embodiment) FIG. 11 is a schematic sectional view of an image forming apparatus to which a sheet feeding apparatus using the above drive control apparatus can be applied, as a fourth embodiment of the present invention. It is a thing.

The image forming apparatus 21 includes an optical system 22 for irradiating a laser beam in accordance with image information, a photosensitive drum 25 as an image carrier, a primary charger 26 as a corona discharger,
An image forming section 23 having a developing device 27 and a cleaner 28;
A sheet transport unit that feeds, transports, and discharges a sheet.

In the image forming section 23, the photoconductor drum 25 having the photoconductor layer is uniformly charged by rotating the surface of the photoconductor drum 25 while a voltage is applied by the primary charger 26, and the photoconductor drum 25 is optically charged based on image information. The optical image emitted from the system through the exposure unit forms a latent image on the photosensitive drum 25 which has been previously charged by the primary charging device 26, and the developing device 2
7 forms an image of a developer (hereinafter referred to as toner).

On the other hand, in synchronization with the formation of the toner image, the sheet 2 on the tray 29 is conveyed by the feeding roller 1, the conveying roller pair 24 and the like which are a part of the sheet feeding device driven by the drive control device. Then, it is conveyed to the image forming unit 23.

The sheet 2 conveyed to the image forming section 23 is
The toner image is transferred by the transfer roller 30 to which a voltage having a polarity opposite to that of the toner image is applied. The image forming unit 23 removes the toner remaining on the photoconductor drum 25 by the cleaner 28 to prepare for the next image formation.

Further, the sheet 2 to which the toner image is transferred is delivered to the fixing roller 31 having a built-in heater, and the transferred toner image is fixed. After that, the sheet 2 is discharged to the discharge roller 32.
And is discharged to the tray 33. Therefore, by applying the sheet feeding device using the drive control device to the image forming apparatus according to the present embodiment, the impact noise is reduced when the image is formed on the sheet, and stable sheet feeding is performed. Therefore, it is possible to provide an image forming apparatus having high image forming accuracy and high production efficiency.

[0095]

As described above, according to the present invention,
The following effects can be obtained.

That is, in the drive control device having the rotating shaft, the first tooth-chipped gear, the second tooth-chipped gear, and the biasing means for intermittently jumping the tooth-chipped gear into the drive gear and the component stopping means, However, the impact sound generated when the drive gear is thrust into the drive gear is intervened by a viscous agent such as an oil-like or grease-like substance between the rotary shaft or the sliding cylindrical surface of the first partially toothed gear and the second partially toothed gear. And a drive control device that realizes a reduction in impact noise by integrally holding a damper performance that prevents the second tooth-chipped gear from crashing into the drive gear, or a sheet feeding including the drive control device. An image forming apparatus including the apparatus or the sheet feeding apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fitted state of a toothless gear according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of a sheet feeding device including a drive control device according to an embodiment of the present invention.

FIG. 3 is a side view of the sheet feeding device including the drive control device according to the embodiment of the present invention.

FIG. 4 is a side view of the vicinity of a second partially toothed gear according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a locking portion of the first partially toothed gear according to the embodiment of the present invention.

FIG. 6 is a side view of the drive control device according to the embodiment of the present invention.

FIG. 7 is a front view and a rear view of a tooth-chipped gear according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a fitted state of a tooth-chipped gear according to a second embodiment of the present invention.

FIG. 9 is a perspective view of a first tooth-chipped gear according to a third embodiment of the present invention.

FIG. 10 is a front view of a first tooth-chipped gear according to a third embodiment of the present invention.

FIG. 11 is a schematic sectional view of an image forming apparatus according to a fourth embodiment of the present invention.

FIG. 12 is an exploded view of a conventional drive control device.

FIG. 13 is a side view of a conventional drive control device.

FIG. 14 is a detailed view of a stationary unit of a conventional sheet feeding drive device.

FIG. 15 is a side view for explaining the operation of the conventional drive control device.

[Explanation of symbols]

1 Paper feed roller 2 sheets 3 Conveyor roller pair 4 drive gear 6,106,206 2nd toothless gear 6a Cylindrical sliding surface 7 solenoid 8 separation pads 10 springs 12 rotation axis 13 Claw 14, 114, 214 1st toothless gear 14a Cylindrical sliding surface 16 Middle plate 16a convex part 17 cam 17a recess 21 image forming apparatus 214g groove 301 Feeding roller 304 drive gear 305 groove 306 Second missing tooth gear 307 solenoid 310 rotation means 312 rotation axis 313 Claw 314 First missing tooth gear G grease D1 Diameter of the cylindrical surface on the 1st toothless gear d1 Diameter of the cylindrical surface on the 2nd partly tooth-missing gear

Continued front page    (72) Inventor Kenji Ninomiya             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation (72) Inventor Takaaki Kawade             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation (72) Inventor Hideki Miyazaki             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation F-term (reference) 3F343 FA01 FB01 GB01 GC01 GD01                       JA01 KB04 LA16 LD24                 3J062 AA35 AB04 AC06 BA11 BA26                       CE02 CE03

Claims (6)

[Claims] 1. A drive control device for transmitting rotation from a drive source to a rotary shaft at a predetermined timing, comprising: a drive gear connected to the drive source; and a drive gear fixed to the rotary shaft. A first partly tooth-missing gear that is provided at a position where it can be meshed with a second part that is rotatably supported with respect to the rotary shaft or the first partly toothless gear, and that is provided at a position that is meshable with the drive gear. A toothless gear, a first stationary means for stopping the first toothless gear in a state where the toothless portion of the first toothless gear faces the drive gear, and a toothless portion of the second toothless gear A second stationary means for stationary the second partly toothed gear while facing the drive gear, and the second partly toothed gear meshes with the drive gear when the second stationary means is released from the stationary state. Rotation means for rotating the first toothless gear and the first stationary gear as the second tooth-chipped gear rotates. Interlocking means for releasing the means, rotating the first tooth-chipped gear and meshing with the drive gear, and adding a viscous agent for applying a braking force to the second tooth-chipped gear, the first tooth-chipped gear. And a second sliding gear between the toothless gear and the second toothless gear. 2. A drive control device for transmitting rotation from a drive source to a rotary shaft at a predetermined timing, a drive gear connected to the drive source, and a drive gear fixed to the rotary shaft. A first partly tooth-missing gear that is provided at a position where it can be meshed with, and a second part that is rotatably supported with respect to the rotating shaft or the first partly toothless gear and is provided at a position that is meshable with the drive gear. A tooth-missing gear, a first stationary means for stopping the first tooth-missing gear in a state where the tooth-missing portion of the first tooth-missing gear faces the drive gear, and a tooth-missing portion of the second tooth-missing gear. A second stationary means for stationary the second partly toothed gear while facing the drive gear, and the second partly toothed gear meshes with the drive gear when the second stationary means is released from the stationary state. Rotation means for rotating the first toothless gear and the first stationary gear as the second tooth-chipped gear rotates. Interlocking means for releasing the means, rotating the first tooth-chipped gear and meshing with the drive gear, and a side surface of a cylindrical portion provided on the second tooth-chipped gear and concentric with the rotation shaft. A rotary shaft and a side surface of a cylindrical portion provided on the first toothless gear and concentric with the rotary shaft,
A drive control device, wherein at least one of the sliding parts holds a viscous agent that applies a braking force to the second toothless gear. 3. When the diameter of the rotary shaft or the cylindrical portion of the first tooth-chipped gear is D1 and the diameter of the second tooth-chipped gear cylindrical portion is d1, 0.1 [mm] ≦ | d1- The drive control device according to claim 1 or 2, wherein D1 | ≦ 0.5 [mm]. 4. At least two groove portions extending in the axial direction of the rotating shaft are provided on at least one of the rotating shaft, the side surface of the cylindrical portion of the first partially toothed gear and the side surface of the cylindrical portion of the second partially toothed gear. The drive control device according to claim 1, 2 or 3, wherein the plurality of groove portions are provided at substantially equal intervals. 5. The drive control device according to claim 1, a rotary shaft connected to the drive control device, and a feeding device for feeding a sheet through which the rotary shaft is passed. A sheet feeding device comprising: a roller. 6. An image forming apparatus, comprising: the sheet feeding device according to claim 5; and an image forming unit that forms an image on a sheet fed from the sheet feeding device.