JP2005178995A - Paper carrying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper carrying device, in which a paper sheet can be smoothly taken out even at the time of jam, and in which breakage will not occur at an attached mechanism part. <P>SOLUTION: This device comprises a carrying roller 9 to take driving force from a drive force transmitting mechanism B1, and a pressure member 9a applied to the circumferential body of the carrying roller 9 in such a way that they cannot be separated from each other, so the paper sheet D is nipped by the carrying roller 9 and the pressure member 9a to be carried as the carrying roller 9 is rotated. Between the drive transmitting mechanism B1 and a drive shaft of the carrying roller, an electromagnetic clutch 9d is provided. When the electromagnetic clutch 9d is on, a drive transmission system of the drive transmission mechanism B1 and the carrying roller 9 is established. When the electromagnetic clutch 9d is off, the carrying roller 9 is rotated freely. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sheet conveying device for feeding or discharging a document or a recording sheet to a reading unit or a recording unit in an image forming apparatus such as a facsimile machine, a copying machine, and a printer (including these multifunction machines).

In general, in the image forming apparatus as described above, a document or recording paper (hereinafter collectively referred to as a sheet, including an OHP sheet) set on a document tray or a recording paper tray (cassette). A plurality of sheet conveying devices are incorporated in a series of sheet conveying paths for separating the sheets one by one and feeding them to the reading unit and the recording unit and discharging them to the discharge tray. Such a paper transport device is composed of a pair of a transport roller that rotates on the axis by obtaining a driving force from a drive transmission mechanism, and a press roller that is pressed against a peripheral body of the transport roller and can rotate freely. A plurality of pairs are arranged along the path, and the sheets are nipped by both rollers and sequentially conveyed by the rotating action of the conveying rollers. Patent Document 1 discloses an automatic document feeder (ADF) in an image reading apparatus, and shows an example in which a plurality of the above-described paper conveying devices are incorporated in this ADF.
JP 2001-130770 A

  In the ADF disclosed in Patent Document 1, when a paper jam occurs in the middle of the paper conveyance path, a frame (cover) that can open or close one of the conveyance roller or the press roller so that the jammed paper can be quickly taken out. It is possible to release the nip between both rollers. However, there are cases where both rollers cannot be separated from each other (at a daily maintenance level) from the viewpoint of the layout configuration of the apparatus or from the viewpoint of cost. When a paper jam occurs while being nipped by such a pair of inseparable rollers, the jam is released by forcibly pulling out the paper or by rotating the driving-side transport roller with fingers to feed out the paper. The

  In the case of releasing the jam in the roller pair that cannot be separated, if the paper is forcibly pulled out, the paper may be torn, the surface of the transport roller may be damaged, or the ink may be contaminated with printing ink. In addition, when the conveyance roller is rotated with fingers, the drive transmission mechanism is connected to the conveyance rollers, so that the burden on the fingers is large, and further, teeth such as gears constituting the drive transmission mechanism are generated. It will also be.

  The present invention has been made in view of the above circumstances, and provides a paper transport device that can smoothly take out paper even when a jam occurs and does not cause damage to an accompanying mechanism.

  The paper transport device of the present invention includes a transport roller that is driven to rotate by obtaining a driving force from a driving drive transmission mechanism, and a pressing member that presses against the periphery of the transport roller so as not to be separated from each other. A sheet conveying device that nips a sheet by a roller and a pressing member and conveys the sheet by rotation of a conveying roller, wherein an electromagnetic clutch is interposed between the drive transmission mechanism and a driving shaft of the conveying roller, and the electromagnetic clutch A drive transmission system between the drive transmission mechanism and the conveyance roller is established when is on, and the conveyance roller is configured to be freely rotatable when the electromagnetic clutch is off.

  The invention of claim 2 is characterized in that an operation knob is connected to the drive shaft of the transport roller, and the transport roller can be rotated by operation of the operation knob when the electromagnetic clutch is off. In the invention of Item 3, a one-way mechanism is interposed between the drive shaft of the transport roller and the operation knob, and the rotational power is transmitted to the operation knob even when the electromagnetic clutch is turned on and the drive transmission mechanism is activated. It is characterized by not being done.

  According to the paper transport device of the present invention, even when a paper jam occurs while being nipped by the transport roller and the pressing member, the electromagnetic clutch interposed between the drive shaft of the transport roller is turned off. Since the transport roller is free to rotate, it is possible to take out the paper without any burden with fingers, and the paper is not torn, and the surface of the transport roller is not damaged or contaminated. Further, since the transmission system with the drive transmission mechanism is cut off, the load at the time of taking out the paper does not apply to the mechanism portion such as the gear, and there is no fear of damage or the like.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a longitudinal sectional view of a main part of an ADF 1 in a facsimile machine, a copying machine, or a so-called multi-function machine having both facsimile and copying functions (including a printer function). The ADF 1 shown in the figure is configured as a double-sided original reading device for reading images on both sides of a sheet (paper) D one by one while feeding it one by one and outputting each as a digital signal. 1 shows that the back side of the paper is the front side (front side) of the ADF 1, and the front side of the paper is the back side (rear side).

  A document tray 2b is detachably attached to the document supply port 2a of the ADF 1 shown in the figure so as to incline downward toward the document supply port 2a. A placement unit 2 is configured. A pickup roller 3 is provided on the document supply port portion 2a to feed out the document D deposited on the document placement portion 2 in the order of pages upward from the upper layer portion. A document separation device 4 for separating and feeding the sheets one by one is provided. The document separation device 4 includes a separation roller 4a and a separation pad 4b urged so as to elastically contact the peripheral body of the separation roller 4a. The document fed out by the pickup roller 3 is introduced between the separation roller 4a and the separation pad 4b, and is separated one by one due to the difference in friction coefficient with respect to the two papers as the separation roller 4a rotates, and is fed downstream. Sent. The compression spring 4c functions to bring the separation pad 4b into elastic contact with the peripheral body of the separation roller 4a. Needless to say, the separating and feeding means 4 includes a separating roller and a retard roller.

  The documents D separated one by one by the document separation device 4 are registered rollers 6, a first transport roller 7 and a second transport roller 8 which are sequentially disposed along a document transport path 5 formed in a U-turn shape. Is conveyed to the first reading point P 1, further fed to the second reading point P 2 by the third conveying roller 9, and discharged to the discharge tray 11 by the discharge roller 10. A platen 12 is disposed at the first reading point P1, and when the document passes over the platen 12, the image information on the surface of the document is sequentially read by the reading and scanning device 13 waiting under the platen 12. As a digital signal.

  The reading scanning device 13 includes a light source 13a formed of a fluorescent lamp or a cold cathode tube, a plurality of mirrors 13b..., A condensing lens 13c, and a CCD (charge coupled device) 13d. It is mounted on 13e. Irradiation light from the light source 13a is reflected by the original passing through the reading point P1 on the platen 12, and then repeatedly reflected by the four mirrors 13b, is condensed by the condenser lens 13c, and enters the CCD 13d ( (Refer to the optical path of the dashed line) In the CCD 13d, image information drawn on the surface of the document is converted into an electric signal and output as a digital signal.

  The reading scanning device 13 shown in the figure is configured to be used also as a mobile reading scanning device for a flatbed scanner (FBS). That is, although a part of the illustration is omitted, the FBS portion 14 is coupled to the left side of the broken portion in FIG. In the illustrated example, the carriage 13e is in a standby / stationary state at the reading position of the ADF document. However, when reading the FBS document, the carriage 13e moves into the FBS unit 14 and passes through the FBS unit 14 along the lower surface of the platen glass 15. The image information of the original placed on the platen glass 15 is read by the reading scanning device 13 in the same manner as described above. The ADF 1, the document tray 2b, and the discharge tray 11 are integrated to form a platen cover, and can be opened and closed up and down with the front side of the paper as a hinge portion (not shown). Accordingly, when the FBS unit 14 reads a document, the platen cover is opened and the document is placed on the exposed platen glass 15.

  As described above, the original whose surface image has been read at the first reading point P1 is further conveyed by the third conveying roller 9 to the second reading point P2, and this second reading point P2 is The contact point between the contact image sensor 16 disposed on the back side of the transported document and the platen roller 17 disposed in contact therewith. That is, the document introduced between the contact image sensor 16 and the platen roller 17 is fed while sliding the contact surface of the contact image sensor 16 by the rotation of the platen roller 17. The image is read by the mold image sensor 16, converted into an electrical signal, and output as a digital signal.

  The separation roller (including the pickup roller 3) 4a, the registration roller 6 and the first conveyance roller 7 constitute a first conveyance system A, and the second conveyance roller 8, the third conveyance roller 9, the platen roller 17 and the discharge roller. Reference numeral 10 constitutes a second transport system B, and the transport systems A and B classified into these two systems use one motor (see FIGS. 2 and 3) 22 as a drive source and drive transmission of two systems described later. Drives are transmitted individually via mechanisms A1 and B1.

  The pickup roller 3 is configured to be driven and transmitted from the drive shaft 4d of the separation roller 4a. Briefly, a frame 3a is attached to the drive shaft 4d via a torque limiter (not shown) so as to be swingable up and down, and a support shaft 3b is supported on the front side of the frame 3a so as to be rotatable. ing. A belt 3d is stretched between a pulley 4e attached to the drive shaft 4d and a pulley 3c attached to the support shaft 3b, and the rotation of the drive shaft 4d passes through the pulley 4e, the belt 3d and the pulley 3c. The rotation of the support shaft 3b is transmitted to the pickup roller 3 via a one-way clutch (not shown).

  The pickup roller 3 configured as described above is positioned above the frame 3a in the standby state, and when the drive shaft 4d rotates in the forward direction (X direction), the frame 3a has the drive shaft 4d as a fulcrum by the action of the torque limiter. Swings downward. This swinging is stopped when the pickup roller 3 is pressed against the uppermost layer portion of the document D deposited on the document placing portion 2, but the transmission system (pulley 4e, belt) is driven by the continued rotation of the drive shaft 4d. The pickup roller 3 rotates via 3d and the pulley 3c). In this way, while the drive shaft 4d is rotating forward, the pickup roller 3 rotates while being pressed against the uppermost layer portion of the stacked originals D, so that the original document D is sequentially fed out from the uppermost layer portion. Then, once the drive shaft 4d stops and rotates in the reverse direction (counter-X direction), the frame 3a swings upward by the action of the torque limiter, and is held stationary in a standby state by the subsequent stop of the drive shaft 4d.

  The separation roller 4a is driven and transmitted from the drive shaft 4d via a not-shown one-way clutch. Accordingly, the document D is fed out from the pickup roller 3 as described above by the forward rotation of the drive shaft 4d, and the fed document is introduced between the separation roller 4a and the separation pad 4b, one by one as described above. Separated and fed downstream. The document D fed from the separation roller 4a is registered by the registration roller 6 and conveyed further downstream. The peripheral speeds of the rollers 7, 8, 9, 17, and 10 after the registration roller 6 are as follows. The peripheral speed of the separation roller 4 a and the pickup roller 3 is set to be larger than the peripheral speed of the separation roller 4 a and the registration roller 6. Accordingly, when the leading edge of the document D fed from the separation roller 4a reaches the registration roller 6, a transport load (tensile force) is applied to the document due to the difference in peripheral speed. However, the separation roller 4a and the pickup roller 3 are not described above. Thus, a one-way clutch (not shown) is incorporated, whereby both rollers 4a and 3 are idly rotated, and the conveying load is alleviated.

  The registration roller 6, the first to third transport rollers 7, 8, 9 and the discharge roller 10 are respectively provided with pressure rollers 6a, 7a, 8a, 9a and 10a, and the original is nipped and transported by these rollers. The The separation roller 4a and the pickup roller 3 and pressure rollers 6a and 7a associated with the separation roller 4a are attached to the inside of a jam access cover 18 pivotally attached to the hinge pin 18a so as to be opened and closed vertically. Accordingly, when a document jam occurs in the document conveyance path 5 up to the second conveyance roller 8, the jam access cover 18 is opened to connect the separation pad 4b, the registration roller 6, and the first conveyance roller 7. Can be easily removed.

  The second conveying roller 8, the third conveying roller 9, the pressure rollers 8a, 9a, the platen roller 17 and the discharge roller 10 which are paired with the second conveying roller 8, the machine frame 19 forming the machine frame of the platen cover including the ADF 1, and the same. It is attached to a cylindrical intermediate inner guide frame 20 fixed to the frame. Further, the contact image sensor 16 and the pressure roller 10a are attached to an intermediate frame 21 pivotally mounted so as to be opened and closed up and down with the drive shaft 6b of the registration roller 6 as a fulcrum. Although the jam clearing of the jammed document between the second transport roller 8 and the third transport roller 9 will be described later, when the jam occurs on the downstream side of the third transport roller 9, the jam access cover 18 is opened and the intermediate frame is opened. If the opening 21 is opened, the nip relationship between the contact image sensor 16 and the platen roller 17 and between the discharge roller 10 and the pressure roller 10a is released, so that the jammed document can be easily taken out at this portion.

  2 and 3 show a drive transmission mechanism for each of the above rollers, FIG. 2 is a front view thereof (a rear view when viewed from the whole ADF 1), and FIG. 3 is a plan view thereof. The body frame 19 is fixedly provided with a sheet metal main body frame (rear frame) 23 for a drive transmission mechanism, and the main body frame 23 is provided with the registration roller 6, the first conveying roller 7, the second conveying roller 9, the platen. One end portions of the drive shafts 6b, 7b, 9b, 17a and 10b of the roller 17 and the discharge roller 10 are pivotally supported. Further, a motor bracket 24 made of sheet metal is fixed to the main body frame 23 with a space therebetween by screwing screws 24b into nut posts 24a fixed to the main body frame 23. Further, the motor bracket 24 is attached with a motor 22 which is a common drive source for the rollers.

  Gears 6c, 7c, 9c, 17b, and 10c are attached to one end portions of the drive shafts 6b, 7b, 9b, 17a, and 10b of the respective rollers, and an output gear (output shaft) 22a of the motor 22 is attached to these gears. The drive is transmitted via an idler gear or a belt. That is, the large-diameter gear of the two-stage first idler gear 25 meshes with the output gear 22a, and the second idler gear 26 meshes with the small-diameter gear of the first idler gear 25. Further, the third idler gear 27 meshes with the second idler gear 26, thereby establishing a drive transmission system dedicated to the separation roller 4a. That is, a notch 23a is formed on the upper side of the main body frame 23. When the jam access cover 18 is closed, the drive shaft 4d of the separation roller 4a is fitted and held in the notch 23a, and one end of the drive shaft 4d is held. 4f meshes with the third idler gear 27, and rotational drive transmission from the output gear 22a of the motor 22 to the separation roller 4a via the first idler gear 25, the second idler gear 26, and the third idler gear 27 is performed. Made.

  A fourth idler gear 28 meshes with the first idler gear 25, and a first timing belt (toothed belt, the same applies hereinafter) 30 is stretched between the fourth idler gear 28 and the fifth idler gear 29. The gear 6c of the registration roller 6 and the gear 7c of the first transport roller 7 are engaged with the fifth idler gear 29. As a result, a drive transmission system for the registration roller 6 and the first conveyance roller 7 is established, and rotational power is transmitted from the output gear 22 a of the motor 22 to the registration roller 6 and the first conveyance roller 7.

  A further sixth idler gear 31 meshes with the output gear 22a, and a second timing belt 32 is stretched between the sixth idler gear 31 and the gear 9c of the third conveying roller 9, thereby providing an output. Rotational power is transmitted from the gear 22 a to the third transport roller 9 via the sixth idler gear 31 and the second timing belt 32. Further, the drive shaft 9b of the third transport roller 9 is driven and transmitted to the gear 8c of the second transport roller 8 through a gear 9e and a fourth timing belt 37 provided on the front frame 36 side as will be described later. (See FIGS. 3 and 4). Further, a third timing belt 34 is stretched between the sixth idler gear 31 and the seventh idler gear 33, and the gear 17 a of the platen roller 17 and the gear 10 c of the discharge roller 10 are engaged with the seventh idler gear 33. As a result, the rotational power is transmitted from the output gear 22 a to the platen roller 17 and the discharge roller 10 via the sixth idler gear 31, the third timing belt 34 and the seventh idler gear 33.

  As described above, the drive transmission system from the first idler gear 25 through the second idler gear 26 to the third idler gear 27, and from the first idler gear 25 through the fourth idler gear 28, the first timing belt 30, and the fifth idler gear 29. The drive transmission system that reaches the gear 6c or the gear 7c is a first drive for sequentially driving the first conveyance system A including the separation roller (including the pickup roller 3) 4a, the registration roller 6, and the first conveyance roller 7. The transmission hand system A1 is configured. Further, a drive transmission system from the sixth idler gear 31 through the second timing belt 32 to the gear 9c and further to the gear 8c, and a drive transmission system from the sixth idler gear 31 through the third timing belt 34 to the gear 17a or the gear 10c. Constitutes a second drive transmission system B1 for sequentially driving the first conveyance system B comprising the second conveyance roller 8, the third conveyance roller 9, the platen roller 17 and the discharge roller 10. Accordingly, the first drive transmission system A1 and the second drive transmission system B1 are configured to be transmitted in a distributed manner from the output shaft 22a of the motor 22, so that when the first conveyance system A conveys the original document. The vibrations based on the conveyance load fluctuation and the gear backlash are not transmitted to the second conveyance system B via the drive transmission systems A1 and B1, and each roller constituting the second conveyance system B Thus, normal rotation is maintained without being affected by the variation in the conveyance load of the first conveyance system A, and the occurrence of distortion of the read image in each reading unit is remarkably reduced.

  Most of the first to seventh idler gears 25, 26, 27, 28, 29, 31, and 33 are composed of multi-stage gears, and the diameter (number of teeth) of each gear is such that each roller has a predetermined peripheral speed. Set as appropriate. Each idler gear is rotatably mounted on a gear stud that is fixed to the main body frame 23 by caulking or the like, and a part of the gear stud is held by the motor bracket 24 at the other end. Further, electromagnetic clutches 26a, 6d and 9d are attached to the second idler gear 26, the gear 6c of the registration roller 6 and the gear 9c of the third transport roller 9 in the drive transmission system to the separation roller 4a, respectively. The roller 6 and the third transport roller 9 are individually controlled to be turned on / off. 2, illustration of the electromagnetic clutches 26a and 6d is omitted.

  In FIG. 2, reference numerals 35a, 35b, and 35c denote tension gears that serve to adjust the tension of the first, second, and third timing belts 30, 32, and 34, respectively. These tension gears 35a, 35b, and 35c are mounted on a tension plate 35 that is swingably mounted in a vertical surface area with the drive shaft 6b of the registration roller 6 as a fulcrum. The tension plate 35 is always elastically biased counterclockwise about the drive shaft 6b by a tension spring 35d, whereby the tension gears 35a, 35b, and 35c are respectively first, second, and third. It acts on the timing belts 30, 32, 34 and keeps them always in tension.

  Next, the 3rd conveyance roller 9 and the press roller (pressing member) 9a as an example of the paper conveyance apparatus of this invention are demonstrated. The third transport roller 9 is attached to the intermediate inner guide frame 20, while the press roller 9a is free to rotate with respect to the machine body frame 19, and the third transport roller 9 is supported by an elastic member such as a leaf spring (not shown). It is installed so as to elastically contact the surrounding body. The third transporting roller 9 can obtain a driving force from the drive transmission mechanism B1 and can rotate in the Y direction of the arrow in FIG. In the ADF 1 shown in the figure, the inner guide frame 20 must be fixed with respect to the machine body frame 19 due to layout restrictions with other mechanisms and the like. 9a cannot be separated from each other at a normal user-side maintenance level.

  Thus, as described above, the gear 9c is attached to one end of the drive shaft 9b of the third transport roller 9 via the electromagnetic clutch 9d. When the electromagnetic clutch 9d is on, the gear 9c is connected via the second timing belt 32. The gear 9c and the third transport roller 9 are rotated by the transmitted rotational power. On the other hand, when the electromagnetic clutch 9d is off, the drive transmission system between the drive shaft 9b and the gear 9c is shut off, so that the third transport roller 9 can rotate freely.

  The second conveying roller 8 is driven and transmitted from the third conveying roller 9, which will be described. This transmission mechanism is configured on the other end side (front side of ADF 1) of the drive shaft 9 b of the third transport roller 9. That is, FIG. 4 is a front view of the drive mechanism as viewed from the front side of the ADF 1, and the drive shaft 9 b of the third transport roller 9 extends across the ADF 1 to the front side and is attached to the body frame 19. The front end portion of the frame 36 is rotatably held. The front end of the drive shaft 8 b of the second transport roller 8 is also held by the front frame 36. Gears 9e and 8c are attached to the front end portions of the drive shafts 9b and 8b, respectively, and a fourth timing belt 37 is stretched between the gears 9e and 8c. A drive transmission mechanism is established. In FIG. 4, the tension pulley 38 is configured to act on the fourth timing belt 37 by the elastic biasing force of the tension spring 38a to keep the fourth timing belt 37 in a constantly tensioned state.

  In the above configuration, when the electromagnetic clutch 9d is turned on and the third transport roller 9 is rotationally driven via the drive transmission system B1, the second transmission is performed by the drive transmission via the gear 9e, the fourth timing belt 37, and the gear 8c. The transport roller 8 is driven to rotate simultaneously. In addition, when the electromagnetic clutch 9d is off, the second transport roller 8 together with the third transport roller 9 can be freely rotated. The electromagnetic clutch 9d may be set to be turned off at least by a jam detection signal. In this way, when the jam occurs, the second conveyance roller 8 and the third conveyance roller 9 are in a state in which they can freely rotate. Then, if the jam access cover 18 is opened, the intermediate frame 21 is opened if necessary, and the end of the jam document to be exposed is pulled out, the document can be taken out with almost no resistance. Therefore, the original is not torn, and the peripheral surfaces of the second conveyance roller 8 and the third conveyance roller 9 are not damaged or contaminated. Further, since the transmission system with the drive transmission system B1 is also cut off, there is no fear of causing tooth missing such as a gear constituting the drive transmission system B1,

  In the example shown in FIG. 4, a part of the jam release operation knob 39 is provided so as to be exposed on the upper surface of the apparatus when the jam access cover 18 is opened. A large-diameter gear 9 f is attached to the drive shaft 9 b of the third transport roller 9, and a two-stage idler gear 40 is engaged between the gear 9 f and the gear 39 a of the operation knob 39. The idler gear 40 incorporates a one-way clutch means (one-way mechanism) 40a such as a ratchet mechanism. When the operation knob 39 is rotated in the direction of the arrow, the operation knob 39 is rotated by the locking action of the one-way clutch means 40a. Is transmitted to the third conveying roller 9 through the idler gear 40 and the gear 9f, and the rotation of the third conveying roller 9 is also transmitted to the second conveying roller 8.

  Therefore, when a document jam occurs in a state where the second conveyance roller 8 and the third conveyance roller 9 are nipped, the jam access cover 18 is opened, and the exposed portion of the operation knob 39 is rotated in the direction of the arrow, so that the second By rotating the transport roller 8 and the third transport roller 9, the original is fed out and the jammed original can be easily taken out. When a jam occurs, the electromagnetic clutch 9d is turned off and the second transport roller 8 and the third transport roller 9 are free to rotate. Therefore, the rotation operation of the operation knob 39 has a small resistance and a small force. Made in When the electromagnetic clutch 9d is turned on and the third conveying roller 9 is rotationally driven for normal document conveyance, the one-way clutch means 40a is unlocked, and the rotation of the third conveying roller 9 is applied to the operation knob 39. It is not transmitted.

  In FIG. 1, a sheet front end aligning shutter 41 that can be projected and retracted is provided on a document placing portion 2 between a pickup roller 3 and a separation roller 4a. The shutter 41 protrudes on the document placing portion 2 in the standby state and functions to align the leading edge of the document D set on the document tray 2b. The shutter 41 moves up and down in conjunction with the rotation of the registration roller 6. It is provided in a swinging link mechanism (not shown) 42, and is configured to appear and disappear on the document placing portion 2 when the link mechanism 42 swings up and down. In this way, the shutter 41 is caused to appear and retract on the document placing portion 2 mechanically interlocking with the registration roller 6, so that the operation mechanism of the shutter 41 can be achieved without using expensive electric parts such as solenoids. It can be configured simply.

  In the above embodiment, the document conveying apparatus in the document conveying system has been described as an example. However, it goes without saying that the present invention can also be applied to a recording sheet conveying system.

It is a longitudinal cross-sectional view which shows an example of the image reading apparatus by ADF. It is a front view which shows the drive transmission mechanism of each roller. It is the same top view. It is a front view which shows a part of the same series of drive transmission mechanisms.

Explanation of symbols

1 ADF
9 Third transport roller (transport roller)
9a Press roller (pressing member)
9b Drive shaft 9d Electromagnetic clutch 39 Operation knob 40a One-way clutch means (one-way mechanism)
B1 Second drive transmission system (drive transmission mechanism)
D Original (paper)

Claims (3)

A conveyance roller that obtains a driving force from the drive drive transmission mechanism and rotationally drives, and a pressing member that presses against the periphery of the conveyance roller so as not to be separated from each other. A paper transport device that transports paper by rotating a transport roller,
An electromagnetic clutch is interposed between the drive transmission mechanism and the drive shaft of the conveyance roller. When the electromagnetic clutch is on, a drive transmission system between the drive transmission mechanism and the conveyance roller is established, and when the electromagnetic clutch is off, conveyance is performed. A sheet conveying device characterized in that the roller is configured to be freely rotatable.   2. A paper conveying apparatus according to claim 1, wherein an operation knob is connected to the drive shaft of the conveying roller, and the conveying roller can be rotated by operation of the operating knob when the electromagnetic clutch is off. .   A one-way mechanism is interposed between the drive shaft of the transport roller and the operation knob, the electromagnetic clutch is turned on, and the rotational power is not transmitted to the operation knob even when the drive transmission mechanism is activated. The sheet conveying apparatus according to claim 2.

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