JPH05196114A - Drive transmission mechanism - Google Patents

Abstract

PURPOSE:To reduce a slip by increasing the dynamic friction factor of a contact face, eliminate a slip by utilizing the engagement of irregularities, and provide resistance against a load and a load change. CONSTITUTION:Irregular grooves are provided on a pulley 39, a motor shaft 37, or a magnet idler 38. The irregular grooves are formed as finely as possible and perpendicularly to the rotation direction (slip direction). Rough machining is applied on the surfaces of the motor shaft 37 and the pulley 39, and trapezoidal grooves are provided as finely as possible on the rubber surface of the magnet idler 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmission mechanism, and more particularly to a drive transmission mechanism that utilizes friction drive to transmit a rotational force to a rotary shaft. For example, it is applied to a printer, a copying machine, a facsimile and the like.

[0002]

2. Description of the Related Art Conventionally, as rotation transmitting means for transmitting rotation of a main shaft to a driven shaft, a belt drive in which a belt is wound around a pulley provided on each of the main shaft and the slave shaft, and a drive shaft for the main shaft and the slave shaft are provided. There was a rim drive etc. that pressed the idler provided between the wheels provided respectively.

In the rotation transmitting means by the belt drive or the rim drive, the pulley and the wheel are respectively subjected to the side pressure due to the tensile force of the belt and the side pressure due to the pressing force of the idler, so that friction loss occurs, and the rotation is accordingly increased. It requires extra rotational drive power of the drive source, resulting in
There is a drawback that the rotary drive source becomes large. In order to solve this point, for example, Japanese Patent Laid-Open No. 61-153048 proposes a "magnetic rotation transmission device".

In this publication, an outer peripheral surface of a main rotating shaft and an outer peripheral wall made of a magnetic body of a driven rotary member having a circular cross section, which is provided adjacent to the main rotating shaft so as to be rotatable around a predetermined shaft. A magnet having a circular cross section is interposed between the outer peripheral surface of the main driving rotary shaft and the outer peripheral surface of the driven rotary member so as to keep adsorbing during rotation. It can be transmitted. That is, it is a device that transmits the rotation by utilizing the attractive force of the magnet.

Further, the previously proposed Japanese Patent Application No. 1-9268.
The “rotation transmission drive device” of No. 0 is to improve the adsorption force by reducing the slip by magnetizing two or more rotating bodies or by subjecting the surfaces of the rotating bodies to the rust treatment.
Further, the “image output device” of Japanese Patent Application No. 2-105781 proposed above relates to a solid-state scanning type optical printer employing a drive transmission mechanism by a magnet idler.

In the above-mentioned Japanese Patent Laid-Open No. 61-153048, there is uneven rotation, which is the greatest drawback of gears and belts,
The noise is reduced so that the rotational driving force can be transmitted smoothly. However, since the sliding rate is high, it has not been put to practical use in devices such as OA devices.

Since the pressing force of the rotating body depends on the magnetic attraction force of the magnet, if the load or load fluctuation of the driven rotating body is large, slippage occurs, and the desired transmission torque, rotation speed and rotation are generated. Accuracy cannot be obtained. Therefore, a rubber coating is applied to the surface of the magnet in order to prevent the slip, but it is difficult to handle because the characteristics greatly differ depending on the rubber hardness.

That is, when the rubber hardness is lowered, the friction coefficient becomes large and slippage is less likely to occur, so that the transmission force and the rotation unevenness are improved, but the spring constant becomes small, which makes it very vulnerable to load fluctuations. .. On the contrary, when the rubber hardness is increased, the spring constant is increased so that the resistance against load fluctuation is increased, but since the friction coefficient is decreased, slippage is likely to occur, and the rubber coating is meaningless. Moreover, since the contact surfaces of the rotating body (driving and driven) and the magnet are smooth surfaces or rubbers together with the smooth surfaces, the dynamic friction coefficient of the contact surfaces does not easily increase.

Therefore, in the above-mentioned Japanese Patent Application No. 2-105781, since the surface of the rotating body is subjected to the rust treatment in order to increase the dynamic friction coefficient of the contact surface, the slip is reduced, and the load and load fluctuations are reduced. You can be stronger against. However, although it has been confirmed that the effect of the porcelain treatment is great, it is necessary to further increase the transmission force (torque) in consideration of the reliability of the device such as the OA device. Further, since the rubbed surface and the rubber coating surface are always in contact with each other, there are many problems (scraping, peeling, etc.) in the durability of each surface.

Further, it has been proposed that both the magnetic body and the rotating body of the magnet are covered with a material having a large friction coefficient such as rubber to further improve the dynamic friction coefficient of the contact surface and reduce the slip, but it is still sharp. It is weak to various load fluctuations, and since slip has not been eliminated, a slight error occurs in the slip ratio of each rotor due to the size of the load on the rotor, and it is still difficult to obtain linear speed and synchronization of each rotor. ..

[0011]

[Purpose] The present invention has been made in view of the above situation, and further reduces the slippage by further increasing the dynamic friction coefficient of the contact surface and eliminates the slippage by utilizing the meshing of the unevenness to reduce the load and load. Strengthen against load fluctuation,
The purpose of the present invention is to provide a drive transmission mechanism with improved rotational accuracy such as uneven rotation and peripheral speed.

[0012]

In order to achieve the above object, the present invention provides (1)
The rotating body of two or more magnetic bodies separated from each other has a rotating body of a magnet located between the rotating bodies of the magnetic body and capable of attracting the rotating body of the magnetic body by a magnetic force. In the drive transmission mechanism for transmitting the rotational force to the rotating body, at least one surface of the rotating body of the magnetic body and the rotating body of the magnet is made uneven, or (2) two or more spaced apart from each other. The rotating body of the magnetic body has a rotating body of a magnet located between the rotating bodies of the magnetic body and capable of attracting the rotating body of the magnetic body by a magnetic force, and transmits the rotating force to the rotating body of the magnetic body. In the drive transmission mechanism, the surface of one of the rotating body of the magnetic body and the rotating body of the magnet has an uneven shape, and the other surface has a shape that meshes with the uneven shape of the one surface,
Furthermore, (3) In the above (1) or (2), the concavo-convex shape is formed so as to be at least substantially orthogonal to the rotation direction of the rotating body. Hereinafter, description will be given based on examples of the present invention.

First, FIG. 5 is a side sectional view for explaining one embodiment of the image output apparatus. In the figure, 1 is the apparatus main body and 2 ₁
2 to ₄ are a plurality of rollers, 3 is a photoconductor, 4 is a charger, 5 is a solid scanning optical writing unit (print head), 6 is a developing unit, 7 is a developing sleeve, 8 is a paper feeding unit, and 9 is Recording paper, 10 is a feed roller, 11 is a turn guide, 12 is a conveyance roller, 14 is a guide plate, 15 is a conveyance path, 16 is a conveyance roller, 17 is a transfer charger, 1
8 is a sensor unit, 19 is a guide, 20 is a fixing unit, 2
0 ₁ is a fixing roller, 20 ₂ is a pressure roller, 21 is a paper discharging roller, 21 and 23 are paper discharging sections, 24 is a cleaning unit, 24 is a cleaning unit, 25 is a blade, 26 is a collecting roller, 27 is an upper cover, 28, 34, 36 is a fulcrum, 30 is a protection member, 31 is a rib, 32 is a guide part, 33 is an operation panel,
Reference numeral 35 is a guide member.

A belt-shaped photosensitive member 3 supported by a plurality of rollers 2 ₁ , 2 ₂ and 2 ₃ and driven to rotate in a clockwise direction is disposed substantially in the center of the apparatus main body 1. The process components arranged around the photoconductor 3 according to the electrophotographic process will be described below.

First, a charging charger 4 for uniformly charging the surface of the photoconductor 3 is provided. Next, a solid-state scanning optical writing unit (also referred to as a print head) 5 for irradiating writing light for forming an electrostatic latent image on the surface of the charged photoreceptor 3 is provided. As the solid-state scanning optical writing unit 5, a fluorescent substance dot array, an LED array, an LC shutter array, an EL dot array, a plasma dot array, or the like is used. The counter roller 2 ₄ disposed in contact with the back surface of the photoreceptor 3 with respect to the solid scanning optical writing unit 5 in order to maintain the relative positions of the solid scanning optical writing unit 5 and the photosensitive member 3, moreover The photoconductor 3 is configured to be entrained to prevent damage. Next, a developing unit 6 for developing the electrostatic latent image to make it visible is provided, and the developing unit 6 includes a developing sleeve 7 and the like.

On the other hand, a paper feed unit 8 is loaded in the lower part of the apparatus main body 1, and recording paper 9 is fed one by one by a paper feed roller 10. Recorded paper 9
The sheet continues to be conveyed by the pair of conveying rollers 12 via the turn guide 11, and further passes through the sensor section 18 through the conveying path 15 formed by the guide portion 32 having the rib 31 and the guide plate 14.

That is, the conveyance path of the recording paper 9 is configured so that the recording paper 9 is turned by 180 ° or more and the recording paper 9 is folded without forming a crease in the recording paper 9. This makes it possible to reduce the size of the device, in other words, to increase the function density described above. The recording paper 9 that has passed through the sensor unit 18 is conveyed toward the photoconductor 3 by a pair of conveying rollers 16 (which can also function as so-called registration rollers) that follows, and the transfer charger 17 operates. Receive the image transfer at. The sensor unit 18 basically generates different electric signals depending on the presence or absence of the recording paper 9, but the front end of the recording paper 9 can be detected by using this electric signal. The controller section (not shown) determines the exposure timing of the solid-state scanning optical writing unit 5 based on the time point when the leading edge of the recording paper 9 is detected.

That is, since it is necessary that the leading end of the recording paper 9 and the leading end of the image area on the photoconductor 3 be positioned at the transfer charger 17 portion at the same timing, Using the known time from when the leading edge passes through the sensor section 18 to contact the photoconductor 3 until the leading edge of the recording paper 9 is detected, the time when the leading edge of the recording paper 9 is detected is used as a reference. The time when the image should be formed on the photoconductor 3 is determined. The recording sheet 9 after the transfer is separated from the photosensitive element 3 by the curvature of the photosensitive element 3 and the weight of the recording sheet 9, and is sent to the fixing unit 20 via the guide 19. In the fixing unit 20, the fixing roller 20 ₁
The recording paper 9 is sandwiched between the pressure roller 20 ₂ and the pressure roller 202 and conveyed, and further conveyed to the paper ejection roller 21 side and ejected onto the paper ejection section 22 or 23 formed at the upper part of the apparatus main body. ..

On the other hand, the residual toner on the surface of the photoconductor 3 after the transfer is cleaned and removed by the blade 25 of the cleaning unit 24, and is collected by a collecting roller 26 in a collecting container (not shown). After that, the photoconductor 3 is again charged by the charging charger 4. At the time of exchanging each unit or processing a paper jam, the upper cover 27 is rotated and opened upward about a fulcrum 28 as shown by a virtual line (two-dot chain line) in the drawing. When the upper cover 27 is opened, the charging charger 4, the solid-state scanning optical writing unit 5, and the developing unit 6 also follow as shown by phantom lines, and the periphery of the photoconductor 3 is largely opened.

When the paper is fed from the paper feeding unit 8 instead of manually, the operation panel 33 is rotated about a fulcrum 34 as shown by a virtual line in the figure. That is, the operation panel 3
Since the guide member 35 rotates about the fulcrum 36 as a virtual line in association with the movement of the sheet 3, the desired recording paper is inserted along the guide member 35 until it hits the conveying roller 12, and then the operation panel 33 is inserted. When a print button (not shown) is pressed, an image forming operation is started, and an image is formed on the recording paper by the above-described process and the paper is ejected.

6 (a) and 6 (b) are configuration diagrams of the power transmission means of the rotating mechanism in the image output device, FIG. 6 (a) is a side sectional view, and FIG. 6 (b) is a plan view. It should be noted that FIG. 6B is a front view of a configuration arrangement of a magnetic rotating body (motor shaft, pulley) and a rotating body of magnet (magnet idler) attracted to the rotating body. In the figure, 13 is a shaft of the conveying roller 16, 29
Roller 2 ₁ axis, 37 is the rotation shaft (motor shaft) is 38,
40 and 42 are magnet idlers, 39, 41 and 43 are pulleys, 44 is a heater, and other parts having the same functions as those in FIG. The rotary shaft, magnet idler, and pulley are shown by thick solid lines in the figure.

The configuration of the drive system of the apparatus of this embodiment has a great influence on the output image quality, that is, when the rotational drive accuracy (uneven rotation, peripheral speed, etc.) is required, the drive force of the present invention is selectively applied. A magnetic idler drive mechanism that employs a transmission means is used, and the other parts are individually configured as independent rotary drive mechanisms. Where the rotation accuracy is required, specifically, the roller 2 ₁ that rotationally drives the belt-shaped photosensitive member 3
And the conveyance roller 16 and the fixing roller 2 that control the conveyance of the paper.
It is 0 ₁ . The magnetic pulley 3 is attached to each roller.
9, 41 and 43 are rotatably attached. The fixing roller 20 _1, taking into account the ease of assembly and thermal insulation, the sleeve of heat-resistant resin is interposed.

On the other hand, a DC motor is fixedly mounted on a frame or the like at a predetermined position of the apparatus main body 1, and the motor shaft 37 of the magnetic body thereof
Are spaced apart and opposed to the outer peripheral surface of the pulley. Between the motor shaft 37 and the pulleys 39 and 41, and between the pulley 41 and the pulley 4
A magnet idler (FIG. 4) composed of a permanent magnet and a yoke is interposed between the magnets 3 and is attracted to the outer peripheral surface of each.

When the rotating shaft 37 made of a magnetic material of the DC motor rotates clockwise, the magnetic idler 38 that magnetically attracts and contacts the counter shaft rotates counterclockwise, and then magnetically attracts the magnetic idler 38. The contacting pulley 39 made of a magnetic material rotates in the clockwise direction. The pulley 39 is attached to the shaft of the drive roller above the transport roller 16,
The conveyance roller 16 can be driven.

On the other hand, when the rotating shaft 37 of the DC motor rotates clockwise, the magnetic idler 40 that magnetically attracts and contacts it rotates counterclockwise, and then magnetically attracts and contacts it. Pulley 41 made of magnetic material
Rotates clockwise. Pulley 41 is attached to the roller 2 ₁ axis for supporting the belt-shaped photoreceptor 3, to allow the driving of the photoreceptor 3.

Further, when the pulley 41 rotates clockwise, the magnetic idler 42 magnetically attracting and contacting the pulley 41 rotates counterclockwise, and then the magnetic idler 42 magnetically attracting and contacting the magnetic idler 42 is formed. The pulley 43 rotates clockwise. Pulley 43 is mounted on the fixing roller 20 _first axis of the fixing unit 20, to allow the rotation drive. The fixing roller 20 _1, considering ease of assembly and thermal insulation, the sleeve of heat-resistant resin is interposed. Each of the magnet idlers 38, 40 and 42 has a cylindrical or cylindrical shape including at least a magnet, and a member having a large friction coefficient such as urethane rubber is provided on the circumferential surface thereof.

On the other hand, the motor shaft 37 and the pulleys 39, 41 and 43 have at least a columnar or cylindrical shape made of a magnetic material, and the circumferential surface thereof is roughened so that the coefficient of friction becomes large. ing. As a matter of course,
Magnet idlers 38, 40 and 42 consisting of magnets
Means that the motor shaft 37 made of a magnetic material and the pulleys 39, 41 and 43 are magnetically attracted and contacted to transmit the power, so that it does not have a magnetic force sufficient to overcome its own weight and rotational force. Don't The use of a magnet idler has a great advantage that even if a rapid speed change occurs, it is buffered and transmitted, because the structure is simple and the power is not firmly transmitted.

FIGS. 1 and 2 are partial structural views showing an embodiment of a drive transmission mechanism according to the present invention. In the drawings, 16 is a conveying roller, 37 is a rotating shaft (motor shaft), 38 is a magnet idler, 39. Is a pulley and 45 is a DC brushless motor. In FIGS. 1 and 2, an uneven groove is provided on the pulley 39, the motor shaft 37, or the magnet idler 38. The concave and convex grooves are as fine as possible, and the rotation direction (sliding direction)
To be orthogonal to. The uneven shape is not limited to a rectangle, a trapezoid, a triangle, or the like. To be more specific, in FIG. 1, the surfaces of the motor shaft 37 and the pulley 39 are rusted, and the rubber surface of the magnet idler 38 is provided with trapezoidal grooves as finely as possible.

In FIGS. 2A and 2B, triangular grooves are provided on the surface of the motor shaft 37 and the pulley 39 as finely as possible. The rubber surface of the magnet idler 38 is smooth as before. As described above, in the case of FIG. 1 and FIG. 2, the dynamic friction coefficient of the contact surface can be considerably increased as compared with the conventional combination of the blast treatment and the rubber.
Sliding can be prevented, and the transmission force (torque) can be increased. Moreover, in the case of FIG. 2, since the triangular protrusions bite into the rubber surface of the magnet idler 38 as seen in FIG. 2B, a further gripping force can be obtained. Although rubber is used as an example in the embodiments, a material having a large friction coefficient and high abrasion resistance, such as plastic, may be used in consideration of reliability and durability. Further, the surface of the pulley may be covered with a material having a large friction coefficient such as rubber or magnet as long as it does not affect the attraction of the magnet idler. However, the magnetic attraction force greatly depends on the thickness of the non-magnetic material covering the rotating body. Therefore, when the material is non-magnetic, it is necessary to make it as thin as possible. The pitch of the irregularities may be equal or unequal.

FIG. 3 is a diagram showing still another embodiment of the present invention. Reference numerals in the figure are the same as those in FIGS. Pulley 3
9, the motor shaft 37, and the magnet idler 38 are provided with concave and convex grooves so that they can mesh with each other. The uneven groove should be as fine as possible and perpendicular to the direction of rotation (sliding direction). The purpose of making the groove fine is to increase the dynamic friction coefficient of the contact surface in the case of FIGS. 1 and 2, but in the case of FIG. 3, the frequency component due to the number of irregularities does not affect the output image at high frequencies. This is to bring it to the area. The uneven shape is not limited to a rectangular shape, a trapezoidal shape, a triangular shape, or the like, but it is necessary to have a shape that allows smooth meshing from the beginning to the end. As described above, in FIG. 3, the concavities and convexities are meshed with each other, so that it is possible to prevent slippage, perform constant rotation at all times, and further strengthen against load and load fluctuation. This driving method is not frictional driving but meshing driving like a gear, but it is a driving method utilizing the attractive force of the magnet idler 38, and the surface of the magnet idler 38 is an elastic body such as rubber.
As a result, uneven rotation and noise can be improved by several steps as compared with gears.

[0031]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1: Since at least one surface of the magnetic body and the rotating body of the magnet is made uneven, the coefficient of dynamic friction of the contact surface becomes large, so that slip can be prevented and transmission force (torque) ) Can be increased. (2) Effect corresponding to claim 2: Since the surface of one of the rotating body of the magnetic body and the rotating body of the magnet is made to be uneven, and the other surface is made to have a shape in which the unevenness meshes with each other. Can be eliminated, and can be made stronger against load and load fluctuation. (3) Effect corresponding to claim 3: Since the concave-convex groove is made to be substantially orthogonal to the rotation direction (sliding direction) of the rotating body, a force acts in a direction to prevent sliding, so that sliding can be prevented. Further, since the irregularities are meshed with each other, slippage can be eliminated. (4) Since slip can be prevented or eliminated by the present invention, a drive transmission mechanism with high rotational drive accuracy, high transmission force (torque), and low noise is possible. Therefore, for example, it is possible to provide an OA device having high image quality and high quality.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a drive transmission mechanism according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the drive transmission mechanism according to the present invention.

FIG. 3 is a configuration diagram showing still another embodiment of the drive transmission mechanism according to the present invention.

FIG. 4 is a configuration diagram of a magnet idler.

FIG. 5 is a configuration diagram for explaining an embodiment of an image output device.

FIG. 6 is a configuration diagram of power transmission means of a rotation mechanism in the image output device.

[Explanation of symbols]

16 ... Conveying rollers, 37 ... Rotating shaft (motor shaft), 38 ...
Magnet idler, 39 ... Pulley, 45 ... DC brushless motor

Claims (3)

[Claims] 1. A rotating body of magnets, which is located between two rotating bodies of magnetic bodies and is separated from each other, and which is located between the rotating bodies of the magnetic bodies and which can attract the rotating bodies of the magnetic bodies by a magnetic force. The drive transmission mechanism for transmitting a rotational force to the magnetic body rotating body, wherein at least one surface of the magnetic body rotating body and the magnet rotating body has an uneven surface. 2. A rotating body of magnets, which is located between two rotating bodies of magnetic bodies and is separated from each other, and which is located between the rotating bodies of the magnetic bodies and can attract the rotating body of the magnetic bodies by a magnetic force. In the drive transmission mechanism for transmitting a rotational force to the rotating body of the magnetic body, one surface of the rotating body of the magnetic body and the rotating body of the magnet is uneven, and the other surface is uneven on one surface. A drive transmission mechanism characterized by having a shape that meshes with. 3. The drive transmission mechanism according to claim 1, wherein the uneven shape is formed so as to be at least substantially orthogonal to the rotation direction of the rotating body.