JPS59126116A - Clutch apparatus - Google Patents

Abstract

PURPOSE:To permit simple and easy restoration to the normal operation even in trouble during scanning-transfer by installing an expandable means equipped with four blades and selecting the solenoid operating conditions and installing a clutch release means, thus permitting the correctly synchronized drive of a photosensitive material and an optical apparatus. CONSTITUTION:An engagement recess 44a is formed on a ratchet wheel 44, and the relative timing between a photosensitive drum 10 and the engagement recess 44a is maintained at constant value. When the ratchet wheel 44 turns to a prescribed position, a clutch is turned ON by the engagement of the ratchet 42 and the engagement recess 44a, and a driving gear 39 is driven, and an illumination apparatus 3 and a mirrors 4, 5, and 6 are scanning-driven in a prescribed timing with the photosensitive drum 10, and the optical image of a manuscript is exposed onto the photosensitive drum 10. When the ratchet wheel 44 performs one revolution, the clutch is turned OFF, and the scanning-drive of the optical apparatus stops. The photosensitive drum 10 and a transfer drum 13 stop when the operation is completed. The optical apparatus scanning-follows when the clutch is turned OFF, and after stop, the optical apparatus returns to the waiting-position irrespectively of the revolution of the photosensitive drum 10 by the operation of a servomotor for scan return.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a clutch device, mainly a two-inch device used as a drive device for an optical device that optically scans a document such as a copying machine, facsimile machine, or electrostatic recording device. Conventional Technology In copying machines, facsimile machines, electrostatic recording devices, etc., especially in color electrophotographic copying machines, it is necessary to precisely synchronize the scanning movement of the scanning optical device with the movement of the photoreceptor, for example, the rotation of the photoreceptor drum. This was required to prevent color shifts in images. For example, in a color electrophotographic copying machine using a visible image transfer method, a color original image is color-separated into, for example, real, green, and red light images through a color separation filter, and a photoreceptor is exposed to light for each separated color using a color-separated plate C. A method is used in which the electrostatic latent images obtained are individually developed into a visible image using a developer of a color complementary to each color, and the visible images of each separated color are transferred onto a copy sheet in a superimposed manner. In such a color electrophotographic copying machine, the original is scanned by reciprocating the original or the optical device a number of times according to the number of separated colors, and an electrostatic latent image is repeatedly formed for each separated color at the same position on the photoreceptor. be done. In this case, if the position of the electrostatic latent image on the photoreceptor is shifted due to color separation, color shift occurs in the image on the copy paper, resulting in a decrease in image quality. To prevent this, the movement of the document table or optical device that moves during document scanning and the movement of the photoreceptor must be accurately synchronized with each other. In order to obtain synchronization of this movement, it is necessary to accurately synchronize the start of operation and the synchronization during operation. The scanning system drive device that moves the document table or the optical device is formed as a transmission device in which the rotational force of the rotary drive device is transmitted through a clutch mechanism such as an electromagnetic clutch or a spring clutch, and scanning is performed by turning on and off the clutch mechanism. The start of movement of the system is controlled. However, if a clutch mechanism is used, 1. This method has the drawback of causing variations in the rise time until the driving force is completely transmitted, and is not suitable for applications that require high synchronization accuracy, such as color electrophotographic copying machines. In order to eliminate this drawback, a clutch having a clutch ring having a locked portion, a locking portion that engages and disengages from the locked portion of the clutch wheel, and a means for controlling the operation of the locking portion are provided. A device has been proposed to eliminate variations in rise time, but if the mechanism stops due to a power outage, accidental power off, or other trouble during scanning, the locking part will engage with the clutch ring. There was a problem in that the method of resetting the locking portion was complicated. Purpose: The present invention solves the problems of the above-mentioned conventional devices in drive devices for optical devices (including document tables) such as copying machines, and achieves, for example, precisely synchronized driving of photoreceptors and optical devices. The object of the present invention is to provide a clutch device for a drive device that can easily and reliably restore normal operation in the event of trouble during scanning movement, and that can be used even in compact optical devices with variable magnification functions. Fig. 1 shows an example of a color electrophotographic copying machine in which the present invention is implemented.Of course, the present invention is not limited to this copying machine, and can be applied to facsimile, static Although it can be used for electronic recording devices, etc., only the case of a copying machine will be explained below. In contrast, the second mirror 5 and the third mirror 6 move back and forth synchronously at 1/2 the speed.The original table is moved back and forth in the space, and each of the above optical members is fixed in position. Illumination light for the original on the original platen 1 is incident on the lens 7 via the first mirror 4, the second mirror 5, and the third mirror 6.
The projected light from the lens 7 passes through the fourth mirror 8 and the color separation filter 9, and is exposed and projected onto the photosensitive drum 10. Around the photosensitive drum 1o are a charger J1, a developing device]2, a transfer drum]3, a separation charger 14, and a cleaning device S''J5.
, and a static elimination box J6 are arranged in sequence. The photosensitive drum 】O is driven in synchronization with the illumination device 3, and when the illumination device 3 moves back and forth to scan and illuminate the original, the photosensitive drum 】O″tl: rotates three times to expose the light image of the original onto the photosensitive drum. The color separation filter 9 is switched every time the illumination device 3 moves back and forth, that is, every rotation of the photosensitive drum 0, and the color separation filter 9 is switched every time the illuminating device 3 moves back and forth, that is, every rotation of the photosensitive drum 10. Images with different separated colors are formed as latent images. , the developing device w12 has 3 units corresponding to each developed color.
Includes seed developer. Copy paper is fed from the paper feeding device 7 to the transfer drum J3 at a certain timing with the scanning exposure of the original, and then transferred to the transfer charger J3.
Under the action of 8, the image is transferred from the photosensitive drum 0 to the copy paper. The above steps are repeated as many times as there are separated colors, and the copy paper fixed to the transfer drum 3 is transferred from the photosensitive drum as many times as there are separated colors. When the image transfer of all separated colors is completed, the copy paper is fixed by a device 21 consisting of a transfer drum 3 under the action of a separation charger 19 and a separation claw 20, and then ejected. A driving device for a scanning optical device according to the present invention used in a copying machine as described above will be described. In FIG. 2, a bracket 22 carrying an illumination device 3 and a first mirror 4, and a mirror bracket 23 carrying a second mirror 5 and a third mirror 6 are connected to a guide rod 2, respectively.
4 is slidingly guided. The mirror drive device 25 is provided with a scan return servo motor 26 and a drive wire 28 wound around a pulley 27 attached to the output shaft of the motor. As shown in FIG.
, tension adjustment pulley 33, movable pulley 31, fixed pulley 34,
The fixed pulley 29 and the transmission pulley 35 are sequentially rotated to form the pulley 27.
The bracket 22 is fixed to the drive wire 28 in the middle of the loop, for example, between the movable pulley 3 and the fixed pulley 34. The movable pulley 31 is rotatably supported by the mirror bracket 23. With this structure, the bracket 22, i.e., the illumination device 3 and the first mirror 4, are moved by the distance traveled by the drive wire 28, whereas the mirror bracket 23, i.e., the second mirror 5, and the third mirror 6 are moved by the distance traveled by the drive wire 28. It moves in the same direction as the bracket 22 by ]/2 of the moving distance. By pulling the tension adjustment pulley 33 with a spring 36, loosening of the drive wire is prevented. The transmission pulley 35 is fixed to a shaft 36 as shown in FIG. 3, and a driven gear 37 is fixed to the shaft 36, and the driven gear 37 meshes with a driving gear 39 rotatably supported by a clutch tll138. ing. The driving gear 39 is provided with a lug 40, and a substantially central portion of a claw arm 41 is pivotally supported on the lug 40, so that it can swing freely. The claw arm 41 has a claw 42 at one end, and the other end is formed as a release operating portion 43. A motorcycle 44 is fixed to the clutch shaft 38 and is engageable with a pawl 42 of a pawl arm 41. A drive gear 39 with a claw arm 4 and a wheel 44
A pawl clutch is constructed by the above. Since the pawl arm 41 is given a force to be pressed against the outer periphery of the motorcycle 44 by a spring or the like (not shown), the motorcycle 44 rotates and the engagement recess 44 (1 of the motorcycle 44 faces the pawl 42 of the pawl arm 41). When the position is reached, the claw 42 automatically engages the engagement recess 44 (Z), the clutch is turned on, and the motorcycle 4
4 is transmitted to the drive gear 39 in a constant relative positional relationship. When the drive tooth rH,; 39 rotates once and reaches a predetermined position, the release actuating portion 43 of the claw arm 4 comes into contact with the release bin 65 fixedly arranged on the frame, and the claw arm 41 moves around the fulcrum 1. When the pawl 42 is rotated, the pawl 42 is disengaged from the engagement tapping portion 44a, the clutch is turned OFF, and the drive gear 3 is rotated.
Transmission between the motorcycle 9 and the motorcycle 44 is interrupted. One rotation of the drive gear 39 causes the transmission pulley 35 to scan the scanning optics, i.e. the illumination device 3 and the mirror 3.4.5.6.
scans forward and then stops. As a clutch disengagement means, a blade support plate 45 is loosely fitted onto the clutch shaft 38 and fixedly supported by the frame as shown in FIG. It has two sets of blades 46, which are two sets of blades 46 rotatably supported at positions facing each other in the direction. Two sets of blades 46 are attached to the front and back surfaces of the blade support plate 45, and the width of the blade 46 attached to the front surface and the blade attached to the back surface are as follows.
The support position by the pin 47 is set at a position relatively shifted by approximately 90 degrees. Note that the number of blades can be arbitrarily selected, either one or an odd number. As shown in FIG. 7, the blade 46 rotatably supports a roller 49 at its free end, and has a first hole 50 and a second hole 50 in its middle portion through which the support pin 47 of the blade on the opposite side and the axis of the roller 49 pass. and holes 51, respectively. 1st hole 50
The second hole 5J is an elongated hole so as not to prevent the blade 46 from swinging around the pin 47 within a predetermined angle range.
It is formed as a straight line or an arc. blade 4
The outer circumferential surface 46ct of the blade 46 is formed in a substantially arc shape, and forms approximately a part of the circumference at the position where the blade 46 rotates to the outermost position around the pin 47. That is, when the outer peripheral surfaces of the two sets of four blades 46 are connected, they approximately form a circle. The circumference formed by the blade 46 turning outward (the outer 5th circle in FIG. 5 and the imaginary circle in FIG. 6) is an expanded circumference, and the circumference formed by turning the blade 46 inward.

[The outer circumference in Fig. 6] is called the contracted circumference. The blade support plate 4 is concentric with the blade support plate 45.
A blade control plate 52 is arranged so as to be rotatable relative to the blade control plate 52, and the blade control plate 52 has a line or curve slightly inclined with respect to the radial direction. Grooves 53 which open radially outward along the blades 46 (equivalent to The lever 54 may be fixed or integrally formed. A solenoid 550 plunger is connected to the lever 54, and a spring 56 is latched to the lever 54 to provide a pulling force in the opposite direction to the suction force of the solenoid 55. When the lever 54 is pulled by the suction force of the solenoid 55, the lever 54, that is, the blade control plate 52, is rotated clockwise in FIGS. 3 and 5, and the groove 53 is rotated.
As a result of this movement, the rollers 49 are moved radially inward, and the blade 46 shifts to the contracted state shown in FIG. Solenoid 55
When the lever 54 is deenergized, the lever 54 is moved counterclockwise by the force of the spring 56, and the blade 46 moves to the expanded state shown in FIG. As shown in FIG. 4, the blade 46 is arranged adjacent to the mold wheel 44, and the outer peripheral surface 46α of the blade 4G is rotatably supported by the claw 42 of the claw arm 41 as shown in FIG. 57 is formed as a guide surface (in other words, a cam surface) in contact, when the blade 46 is in the expanded state as shown in FIG. 5, the pawl arm 41 moves as shown in FIG. 44, and the claw 42
is held in a state where it cannot be engaged with the engagement recess 44α of the mold wheel 44. That is, the pawl clutch is held in the Oli'F state. The rotation of the mold wheel 44 is not transmitted to the first gear 39. On the other hand, when the blade 46 is in the retracted state shown in FIG. 6 due to the movement of the lever 54, the pawl arm 4] is rotated clockwise about the fulcrum as shown in FIGS.
(not shown), the state shifts to the state shown in FIG. In this engaged state, the clutch is in an ON state, and the rotation of the mold wheel 44 is transmitted to the drive gear 39, that is, the transmission gooley 35. In that case, the clutch is controlled ON and OFF' by the operation of the solenoid 55. A driven gear 58 is attached to the clutch shaft 38 to which the model wheel 44 is fixed.
is fixed, and the driven gear 58 is driven via an idle gear 61 by a drive gear 60 fixed to an input shaft driven by a main drive device (not shown) via a belt or the like. On the other hand, the drive gear 60 meshes with a gear 62 fixed to the photosensitive drum 30 to drive the photosensitive drum 10. The photosensitive drum 10 and the transfer drum 13 are a pair of gears 6 that mesh with each other.
3 and 64 at a one-to-one speed. The present invention will be described in detail. A drive device (not shown) drives the photosensitive drum 10 and the transfer drum 13 via gears 60 and 62, and in synchronization with the drive of the transfer drum J3, the gears 60 and 6B
The mold wheel 44 is driven via the. Since engagement recesses 44 (Z) are formed in the mold wheel 44, the relative timing between the photosensitive drum IQ and the engagement recess 44a is always kept constant. When the mold wheel 44 rotates to a predetermined position, the pawl arm 4] claw 42
The pawl clutch is turned on by the engagement with the engagement recess 44α, the drive gear 39 is driven, and the illumination device 3 and the mirrors 4, 5.6 are driven to scan with the photosensitive drum 10 at a predetermined timing, and the original is scanned. The optical image is exposed to a photosensitive drum. When the model wheel 44 rotates, the release pin 65 and claw arm 4J
The pawl clutch is turned off and the scanning drive of the optical device is stopped. -Force photosensitive drum] O and transfer drum]
3 stops after completing the predetermined work. The optical device including the illumination device 3 is scan-driven by turning off the pawl clutch, and after stopping, the servo motor 2 for scan return is activated.
By the operation of 6, the photosensitive drum is returned to the standby position regardless of the rotation of 0. The gear 39 rotates in a direction opposite to that of the die wheel 44, and the pawl 42 arrives and waits before the $44α of the die wheel 44 reaches the normal engagement position. Repeat the following operations. If the device stops midway due to a power outage or the power is cut off due to a power outage, the claw clutch will stop in an engaged state, but if the power is cut off or the power is turned off by mistake, it will naturally turn off. In addition, in the event of equipment trouble, the solenoid's electric wire is turned off immediately.In any of the above cases, the solenoid turns off and the clutch is released, allowing for immediate scan return. 26, it becomes possible to return to the standby position, that is, the home position.Therefore, when the copying cycle is stopped in the middle, the illumination device, etc. can be immediately returned to the home position. According to the invention, by providing a means with a simple structure of expandable and retractable means having four blades, it is possible to reliably and quickly reset the scanning optical device to the home position when it stops at an arbitrary position. Furthermore, by selecting the operating conditions of the solenoid, the starting position of the optical device's return movement can be arbitrarily selected according to the size of the document, regardless of the rotation of the photosensitive drum, and the reciprocating stroke of the scanning optical device can be adjusted. By providing the clutch release means according to the present invention, it is possible to create a reliable pawl clutch with no slippage in the engagement and disengagement of the clutch with one engaging four parts. It has become possible to obtain it with a simple structure called a claw.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating a copying machine that utilizes the present invention, FIG. 2 is a perspective view of a portion of the drive device of the scanning optical device, and FIG. 3 is a perspective view of another portion of the drive device of the scanning optical device. , FIG. 4 is a side sectional view of the clutch portion and clutch disengagement means, and FIG.
The figure is a front view of the clutch disengagement means in an expanded state, FIG. 6 is a front view of the clutch disengagement means in a contracted state, and FIG.
8 is a front view of the blade control board, FIG. 9 is a diagram showing the relationship between the claw arm of the claw clutch, the model wheel, and the outer surface of the blade of the clutch disengagement means, and A is the outer surface of the blade. B is a diagram showing the time of expansion and B is the time of contraction. 1...-Original table 3...Illuminating device 4.5.6
... Mirror 25 ... Drive device 26 ... Reverse motor 28 / Wire 35 ... Transmission gear 1. J-3
9... Drive gear (rotating body) 4J... Claw arm 42... Claw 44 type wheel
45...Blade support plate 46...Blade
47... Pin (fulcrum) 52... Blade control plate 53... Groove 54... Lever 55... Solenoid 56... Spring 57... Pawl roller No. 4
figure

Claims (1)

[Scope of Claims] (]) A model wheel fixed to a driven shaft and having an engagement recess on its periphery; In the clutch device, the clutch device includes a rotating body that swingably supports a pawl arm having an engageable pawl, and the rotary body is transmission connected to a driven member, and a pawl roller is provided near the pawl of the pawl arm. , a blade support plate arranged in a fixed position, and one or more supports m, etc. arranged on the circumference of the blade support plate with respect to the central axis j* of the mold wheel. and a blade supported so as to be swingable within a predetermined range, such that the outer circumferential surface of the blade becomes an arcuate surface around the center axis of the motorcycle at the most radially outward position (CC). The blade is formed with rollers at the end of the blade, and is arranged adjacent to the blade support plate so as to be rotatable around the center axis of the mold wheel, and has a roller on the outer periphery of the blade. A blade control plate is provided with a groove in which the roller engages, the groove is formed in a shape corresponding to a locus of movement of the roller to engage around the blade fulcrum, and a lever is provided in the blade control plate. , a solenoid and a spring that opposes the suction force of the solenoid are connected to the lever, and ``the blade support plate is arranged so that the claw core a of the claw arm can come into contact with the outer periphery of the blade. A latch device that allows for arbitrary claw release. (2) The clutch device according to claim 1, characterized in that the clutch device comprises a scanning optical device in which a driven member connected to the rotating body is reciprocated. (3) The scanning optical device includes a fixed document table, an optical device including an illumination device and a mirror that are reciprocated with respect to the document table, and a transmission having a wire connected to the optical device and driving the optical device. The present invention is characterized by comprising a device, a transmission pulley for driving the wire, and a return motor for driving the wire in a direction opposite to the transmission pulley, and the transmission pulley is drivingly connected to the rotating body having the claw arm. A clutch device according to claim 2.