JP2018002367A - Medium conveyance device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium conveyance device and image forming apparatus which can reduce occurrence of multi-feeding of recording media.SOLUTION: A medium conveyance device includes: a medium loading part for loading media; a first delivery roller which is brought into contact with the medium on the medium loading part, and delivers the medium in a conveyance direction; a second delivery roller which is arranged on the downstream side of the first delivery roller in the conveyance direction, is brought into contact with the medium on the medium loading part and delivers the medium in the conveyance direction; and a control part which controls driving of the first delivery roller and the second delivery roller. There is also provided an image forming apparatus having the medium conveyance device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medium conveying apparatus that feeds a recording medium and an image forming apparatus that forms an image on a recording medium fed by the medium conveying apparatus.

  In a method using a general separation roller (retard roller) as a medium conveying device for feeding a recording medium in an image forming apparatus, the leading end of the recording medium fed by a pickup roller is formed by a paper feeding roller and a separation roller. It is made to rush into the pressure contact portion of the roller pair. A rotation load is applied to the separation roller by a torque limiter. When the two recording media overlap each other, the separation roller serves as a brake, so that only the uppermost recording medium is conveyed by the conveyance roller. (For example, see Patent Document 1).

JP 2015-143140 A

  In the medium conveying apparatus according to the prior art, a medium in which a plurality of recording media are fed in a state of being overlapped, so-called double feeding may occur, and in the future, the occurrence of double feeding can be further reduced. There is a need to provide a transport device.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a medium transport apparatus capable of reducing the occurrence of double feeding of recording media.

  Another object of the present invention is to provide an image forming apparatus that forms an image on a recording medium fed from a medium conveying apparatus that can reduce the occurrence of double feeding of the recording medium.

  In order to solve the above-described problem, a medium transporting apparatus according to the present invention includes a medium stacking unit for stacking a medium, and a first feeding roller that contacts the medium on the medium stacking unit and feeds the medium in a transporting direction. A second feeding roller that is disposed downstream of the first feeding roller in the transport direction and that abuts on the medium on the medium stacking unit and feeds the medium in the transport direction; and A control unit that controls driving of the feeding roller and the second feeding roller is provided.

  In addition, an image forming apparatus according to the present invention includes the above-described medium transport device.

  ADVANTAGE OF THE INVENTION According to this invention, the medium conveying apparatus which can reduce generation | occurrence | production of double feeding of a recording medium can be provided.

  In addition, according to the present invention, it is possible to provide an image forming apparatus that forms an image on a recording medium fed from a medium conveying apparatus that can reduce the occurrence of double feeding of the recording medium.

1 is a schematic configuration diagram illustrating a configuration of a printer as an image forming apparatus according to an embodiment. FIG. 2 is a perspective view illustrating a schematic configuration of a paper tray according to the present embodiment. It is a side view explaining the schematic structure of the paper tray which concerns on this embodiment. It is a top view explaining the drive transmission part of the paper feed / conveyance part concerning this embodiment. It is a state explanatory view explaining the operation of the paper feed / conveyance unit according to the present embodiment. It is a state explanatory view explaining the operation of the paper feed / conveyance unit according to the present embodiment. It is a state explanatory view explaining the operation of the paper feed / conveyance unit according to the present embodiment. It is a state explanatory view explaining the operation of the paper feed / conveyance unit according to the present embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably.

  FIG. 1 is a schematic configuration diagram illustrating the configuration of a printer 10 as an image forming apparatus according to the present embodiment. The printer 10 is an intermediate transfer type image forming apparatus capable of forming an image on a sheet 101 as a recording medium using toner as a developer by an electrophotographic method.

  As shown in FIG. 1, the printer 10 has a sheet conveyance path S formed in a substantially S shape starting from the paper feed / conveyance unit 200 and ending with the discharge roller pair 803 via the sheet conveyance unit 400. ing. The sheet transport path S abuts on an intermediate transfer belt 600 that holds and transports a toner image developed with toner as a developer in image forming units 530A, 530B, 530C, 530D, and 530E, which will be described later. A secondary transfer roller 690 for transferring to the paper 101 and a fixing device 700 for fixing the toner image transferred to the paper 101 are provided.

  The paper feeding / conveying unit 200 takes out a sheet 101 stacked on a sheet tray 100, which will be described later, from the top of the sheet 101 and feeds it out to the sheet conveying path S. The configuration of the sheet feeding / conveying unit 200 will be described later.

  The paper transport unit 400 includes transport roller pairs 402 and 403 and the like, and transports the paper 101 fed out by the paper feed / transport unit 200 along the paper transport path S.

  The intermediate transfer belt 600 is an endless belt member stretched by a secondary transfer backup roller 691, an intermediate transfer belt driving roller 692, and driven rollers 693 and 694. In the image forming units 530A, 530B, 530C, 530D, and 530E, With the developed toner image carried, the toner image is driven in the direction of arrow F in FIG. 1, and the toner image is conveyed to a secondary transfer point formed between the secondary transfer roller 690 and the secondary transfer backup roller 691. The secondary transfer roller 690 sandwiches the sheet 101 conveyed along the sheet conveyance path S together with the toner image transferred onto the intermediate transfer belt 690, and applies a predetermined voltage having a polarity opposite to the charging potential of the toner. As a result, the toner image on the intermediate transfer belt 690 is secondarily transferred to the paper 101.

  The image forming units 530A, 530B, 530C, 530D, and 530E are located at positions facing the photosensitive drums of the image forming units 530A, 530B, 530C, 530D, and 530E, which will be described later, via the intermediate transfer belt 690. Primary transfer rollers 560A, 560B, 560C, 560D, and 560E are provided for primary transfer of the toner image developed in step 1 to the intermediate transfer belt 600. The primary transfer rollers 560A, 560B, 560C, 560D, and 560E have a configuration in which a metal sponge is covered with a urethane sponge layer, and the surface of the photosensitive drum is driven by a predetermined transfer voltage applied from a primary transfer voltage power source (not shown). The toner image developed above is primarily transferred onto the intermediate transfer belt 600.

  The fixing device 700 includes a fixing roller 700a and a backup roller 700b, and fixes the toner image transferred to the paper 101. In the fixing roller 700a, for example, a hollow cylindrical metal shaft made of aluminum or the like is coated with a heat-resistant elastic layer of silicone rubber, and a PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) tube is coated thereon. Is formed by. In the metal shaft, for example, a heater such as a halogen lamp is provided. The backup roller 700b has a configuration in which, for example, a metal shaft made of aluminum or the like is covered with a heat-resistant elastic layer of silicone rubber and PFA is covered thereon, so that a pressure contact portion is formed between the backup roller 700b and the fixing roller 700a. It is arranged. The paper 101 on which the toner image has been transferred at the secondary transfer point is applied with heat and pressure when passing through the pressure contact portion formed by the fixing roller 700a and the backup roller 700b maintained at a predetermined temperature, and the toner is applied. When the toner image is melted, the toner image is fixed.

  The discharge roller pair 803 discharges the sheet 101 that has passed through the fixing device 700 to a stacking unit 805 that is formed using the outer casing of the device.

  The printer 10 includes a medium tray 900 for feeding a recording medium (for example, a long medium, a medium having a large thickness, an OHP film, etc.) that cannot be conveyed by the sheet feeding / conveying unit 200 into the printer. The medium tray 900 is configured to be foldable and housed in the printer main body, and the recording medium fed out from the medium tray 900 is fed to the paper transport unit 400.

  Next, the image forming units 530A, 530B, 530C, 530D, and 530E will be described. Note that the configurations of the image forming units 530A, 530B, 530C, 530D, and 530E are different, for example, only toners such as black, magenta, cyan, yellow, and clear, and the other configurations are all the same. Therefore, in this description, the image forming unit 530A will be described. The image forming unit 530A includes a photosensitive drum 531 as an image carrier that is rotatably supported in an arrow direction in the figure, and a charging roller 532 disposed so as to be in pressure contact with the upstream side in the rotational direction of the photosensitive drum 531. An exposure device 533 disposed immediately above the photosensitive drum 531, a developing roller 534 disposed so as to be in pressure contact with the photosensitive drum 531, and a supply roller 535 disposed opposite to the developing roller 534. Is provided.

  The photosensitive drum 531 is composed of a conductive support and a photoconductive layer, and an organic photoconductor having a structure in which a charge generation layer and a charge transport layer as a photoconductive layer are sequentially laminated on a metal shaft such as aluminum as a conductive support. The electrostatic latent image based on the image data is formed by the irradiation light irradiated from the exposure device 533. The photosensitive drum 531 is provided with a gear (not shown) for driving so as to be rotatable in the arrow direction in the drawing.

  The charging roller 532 is configured, for example, by coating the outer periphery of a metal shaft such as stainless steel with semiconductive epichlorohydrin rubber. The charging roller 532 is disposed so as to be in pressure contact with the photosensitive drum 531 and uniformly charges the surface of the photosensitive drum 1.

  The exposure apparatus 533 includes, for example, an LED head composed of LED (Light Emitting Diode) elements and a lens array, and irradiation light emitted from the LED elements based on image data is coupled to the surface of the photosensitive drum 531. It arrange | positions so that it may become a position to image.

  For example, the developing roller 534 is coated with urethane rubber in which carbon black is dispersed on the outer periphery of a metal shaft such as stainless steel, and the surface thereof is subjected to an isocyanate treatment. The developing roller 534 is disposed so as to be in pressure contact with the surface of the photosensitive drum 531, supplies toner to the electrostatic latent image formed on the surface of the photosensitive drum 531, and develops the toner image.

  The supply roller 535 is configured, for example, by coating the outer periphery of a metal shaft such as stainless steel with a semiconductive foamed silicone sponge layer. The supply roller 535 is disposed so as to be in pressure contact with the developing roller 534 and supplies the toner contained in the toner cartridge 550 to the developing roller 534.

  The toner cartridge 550 is a box-shaped member having a space for storing unused toner. A shutter (not shown) for supplying toner to the supply roller 535 is formed in the lower part of the toner cartridge 550, and the toner dropped through the shutter is supplied to the supply roller 535.

  The printer 10 also includes a control unit 801 and a paper feed / conveyance drive source 800. A control unit 801 is a control unit that controls image formation in the printer 10, and includes a first pickup roller 203, a second pickup roller 204, a paper feed roller 205, a paper transport unit 400, an intermediate transfer driving roller 692, a fixing unit. Drive control of various rollers such as the apparatus 700 and the discharge roller pair 803 is performed. The paper feed / conveyance drive source 800 has driving force generating means such as a motor (not shown), and the driving force generated by the driving force generating means is transmitted via shafts 213, 214, 215 and the like described later. Each roller connected to the shaft is rotated.

  Next, the paper feed / conveyance unit 200 according to the present embodiment, in particular, the paper tray 100 will be described with reference to FIGS. FIG. 2 is a perspective view illustrating a schematic configuration of the paper tray 100, and FIG. 3 is a side sectional view. In the description here, the paper feed direction, which is the insertion / extraction direction of the paper tray 100 with respect to the printer 10, is the x direction, the vertical direction with respect to the x direction is the y direction, and the vertical direction with respect to the x direction and the y direction. Explanation will be made on the z direction.

  As shown in FIGS. 2 and 3, the paper tray 100 has an open top box shape and is configured to be inserted into and removed from the printer 10. Such a paper tray 100 includes a paper stacking tray 102, a movable paper stacking tray 103, a paper guide pair 104, a paper guide 105, a shaft 106, a pickup frame 201, a spring 202, and a first feeding roller. The first pickup roller 203 as the second pickup roller, the second pickup roller 204 as the second feeding roller, the paper feed roller 205, the separation roller 206, and the drive transmission unit 220 are provided.

  The paper stacking tray 102 and the movable paper stacking tray 103 are plate-like members on which the paper 101 is stacked. The movable paper stacking tray 103 is configured to be movable in the vertical direction in the z direction in the figure.

  The paper guide pair 104 includes a guide plate member that fixes the side surface of the paper 101, a rack member (not shown) formed continuously with the guide plate member, and an illustrated pinion gear that engages with the rack member. The guide plate member is configured to be slidable in the y direction in the figure, which is perpendicular to the paper feed direction of the paper 101.

  The paper guide 105 includes a guide plate member that fixes the rear end of the paper 101, and a slide groove (not shown) that can be engaged with the guide plate member. It is configured to be slidable in the x direction.

  The shaft 106 is connected to a paper feed / conveyance drive source 800, which will be described later, and moves the paper tray 100 in the vertical direction indicated by the arrow z in FIG. 1 by the drive force supplied from the drive source.

  The pickup frame 201 is a support member that rotatably supports the first pickup roller 203 and the second pickup roller 204. The pickup frame 201 is provided so as to be rotatable with the driving of a shaft 215 described later.

  The spring 202 is a biasing member that biases the pickup frame 201 downward in the z direction in FIG.

  The first pickup roller 203 and the second pickup roller 204 are both roller members that feed out the paper 101 and are supported by the pickup frame 201 so as to be rotatable. Further, the first pickup roller 203 and the second pickup roller 204 are urged against the sheet 101 by the urging force of the spring 202 via the pickup frame 201.

  The paper feed roller 205 is a roller member that conveys the paper 101, and the separation roller 206 is a roller member that separates the paper 101. The paper feed roller 205 and the separation roller 206 constitute a separation unit.

  As shown in FIG. 3, a sheet detection sensor 401 and a conveyance roller pair 402 are provided on the downstream side in the sheet conveyance direction between the paper feed roller 205 and the separation roller 206. The paper detection sensor 401 is an optical or mechanical sensor member that detects the passage of the paper 101, and the detection result of the paper detection sensor 401 is output to a control unit (not shown). The conveyance roller pair 402 is a roller member that constitutes the sheet conveyance unit 400, and conveys the sheet 101 fed from the sheet feeding tray 100 along the sheet conveyance path S.

  Next, the drive transmission unit 220 of the paper feed / conveyance unit 200 will be described with reference to FIG. FIG. 4 is a top view of the drive transmission unit 220 as viewed from the −z direction in FIG. 1.

  The drive transmission unit 220 includes shafts 213, 214, 215, electromagnetic clutches 223, 224, 225, and an electromagnetic brake 234. 1 is connected to the shafts 213, 214, and 215 of the drive transmission unit 220 via a gear (not shown).

  The shaft 213 rotatably supports the first pickup roller 203 and rotates by the driving force transmitted from the paper feed / conveyance driving source 800 via the electromagnetic clutch 223.

  The shaft 214 rotatably supports the second pickup roller 204, and rotates by the driving force transmitted from the paper feed / conveyance driving source 800 via the electromagnetic clutch 224.

  The shaft 215 rotatably supports the paper feed roller 205, and is rotated by a driving force transmitted from the paper feed / conveyance drive source 800 via the electromagnetic clutch 225.

  The electromagnetic clutch 223 is provided so as to be rotatable with respect to the shaft 213 in the non-energized state (OFF), and is electromagnetically joined to the shaft 213 in the energized state (ON) to supply the sheet feeding / conveying drive source. The driving force supplied from 800 can be transmitted to the shaft 213 to rotate the first pickup roller 203.

  The electromagnetic clutch 224 is provided so as to be rotatable with respect to the shaft 214 in the non-energized state (OFF), and is electromagnetically joined to the shaft 214 in the energized state (ON). The driving force supplied from 800 can be transmitted to the shaft 214 to rotate the second pickup roller 204.

  The electromagnetic clutch 225 is provided so as to be rotatable with respect to the shaft 215 in the non-energized state (OFF), and is electromagnetically joined to the shaft 215 in the energized state (ON), thereby feeding / feeding driving source. The driving force supplied from 800 can be transmitted to the shaft 215 to rotate the paper feed roller 205.

  The electromagnetic brake 234 is provided so as to be rotatable with respect to the shaft 214 in the non-energized state (OFF), and is electromagnetically joined to the shaft 214 in the energized state (ON) to drive the shaft 214. To regulate.

  Next, the operation of the paper feeding / conveying unit 200 according to the present embodiment will be described with reference to FIGS.

  FIG. 5 is a state explanatory diagram showing a stationary state before the sheet feeding operation. In this state, since the electromagnetic clutches 223, 224, 225 and the electromagnetic brake 234 are in a non-energized state, they are idling and the paper feed / conveyance drive source 800 is not driven. When the paper 101 in the paper feed tray 100 is set, the control unit 801 raises the shaft 106 and moves the paper tray 100 and the paper 101 set to a predetermined paper feed position. At a predetermined paper feed position, the first pickup roller 203 and the second pickup roller 204 are in contact with the paper 101. At this time, the first pickup roller 203 and the second pickup roller 204 are urged against the paper 101 by the spring 202 via the pickup frame 201.

  In the description of FIG. 6, the uppermost sheet 101 of the sheet feeding tray 100 is described as the sheet 101a, and the second and subsequent sheets 101 from the uppermost section are described as the sheet 101b.

  When the electromagnetic brake 234 is energized based on the control of the control unit 801 from the stationary state of FIG. 5, the drive of the shaft 214 is restricted and the second pickup roller 204 does not rotate as shown in FIG. In this state, when the electromagnetic clutch 223 is energized based on the control of the control unit 801, the first pickup roller 203 starts rotating based on the driving force supplied from the paper feed / conveyance drive source 800, and the paper 101a In the drawing, the conveyance in the sheet conveyance direction in the x direction is started, and the sheet rear end position moves. However, since the second pickup roller 204 does not rotate at this time, the front end position of the sheet does not change. As a result, the sheet 101a between the first pickup roller 203 and the second pickup roller 204 is lifted in the z direction in the figure, and the sheet 101a which is the uppermost sheet 101 and the second sheet 101b from the uppermost part. A space G is formed between the two.

  When the electromagnetic brake 234 is in a non-energized state and the electromagnetic clutches 224 and 225 are in an energized state based on the control of the control unit 801 from the state of FIG. 6, as shown in FIG. Based on the driving force, the second pickup roller 204 and the paper feed roller 205 start rotating, and the paper 101a is transported in the paper transport direction in the x direction in the figure. In this state, when the electromagnetic clutch 223 is in a non-energized state based on the control of the control unit 801, the first pickup roller 203 can idle and rotates along with the conveyance of the sheet 101a. As a result, the space G disappears, and at the same time, a difference H between the leading end positions of the uppermost sheet 101a and the second and subsequent sheets 101b from the uppermost part occurs. In FIG. 7, the difference H is shown to be large for the sake of explanation. However, in reality, it is sufficient that there is a slight difference, and the difference H is slight at the leading end position between the uppermost sheet 101a and the second and subsequent sheets 101b from the uppermost part. Due to the difference, three or more sheets 101 do not enter the pressure contact portion between the sheet feeding roller 205 and the separation roller 206 in a state where the leading edges are completely aligned, and the sheet 101 is separated by the separation roller 206. It will be properly separated.

  Note that since the magnitude of the difference H may vary depending on the paper type and printing speed, depending on the paper type, the difference H may be too small to cause double feeding. In order to increase the difference H, the space G may be increased. For that purpose, the driving rotation time of the first pickup roller 203 may be lengthened while the rotation of the second pickup roller 204 is stopped. In order to realize this adjustment function, it is preferable that it can be arbitrarily set from a setting menu for setting the energization time of the electromagnetic brake 234.

  When the sheet 101a separated from the state shown in FIG. 7 is conveyed downstream by the second pickup roller 204 and the sheet feeding roller 205 in the sheet conveying direction as shown in FIG. It is detected that the sensor 401 has been reached and is sandwiched between the pair of conveying rollers 402. Thereafter, when the electromagnetic clutches 224 and 225 are in a non-energized state based on the control of the control unit 801, the sheet 101a is conveyed by the conveying roller pair 402. The second pickup roller 204 and the paper feed roller 205 are rotated along with the conveyance of the paper 101a, and after the paper 101a has completely passed, the state shown in FIG.

  An image forming operation for forming an image on the sheet 101 fed by the sheet feeding / conveying unit 200 will be described.

  First, when a print command is input from a host device (not shown) such as a personal computer, the photosensitive drum 531 rotates at a constant speed in the direction of the arrow in FIG.

  The driving force accompanying the rotation of the photosensitive drum 531 is transmitted to the developing roller 534 through a gear (not shown), the developing roller 534, a supply roller 535 disposed so as to be in pressure contact with the developing roller 534, and The charging rollers 532 arranged so as to come into pressure contact with the photosensitive drum 531 start to rotate.

  The charging roller 532 uniformly and uniformly charges the surface of the photosensitive drum 531 with a predetermined voltage applied from a charging voltage power source (not shown). Next, the exposure device 533 forms an electrostatic latent image on the surface of the photosensitive drum 531.

  As the toner on the surface of the developing roller 534 adheres to the electrostatic latent image formed on the surface of the photosensitive drum 531, the toner image is reversely developed.

  On the other hand, the sheet 101 fed from the sheet feeding / conveying unit 200 is conveyed to a secondary transfer point formed between the secondary transfer roller 690 and the secondary transfer backup roller 691.

  Incidentally, the primary transfer rollers 560A, 560B, 560C, 560D, and 560E provided at positions facing the photosensitive drums 531 included in the image forming units 530A, 530B, 530C, 530D, and 530E are not sushi 1 A predetermined voltage is applied from the next transfer voltage power source. The primary transfer rollers 560A, 560B, 560C, 560D, and 560E primarily transfer the toner image developed on the surface of the photosensitive drum 531 to the intermediate transfer belt 600 that is driven in the direction of arrow F in FIG.

  The toner image primarily transferred onto the intermediate transfer belt 600 is subjected to secondary transfer at a secondary transfer point, to which a predetermined voltage having a polarity opposite to the toner charging potential is applied from a secondary transfer voltage power source (not shown). Secondary transfer is performed on the sheet 101 by the roller 690. The sheet 101 on which the toner image has been secondarily transferred is conveyed to the fixing device 700, and heat and pressure are applied when passing through the pressure contact portion formed by the fixing roller 700a and the backup roller 00b maintained at a predetermined temperature. Then, the toner is melted and the toner image is fixed. The fixed sheet 101 is discharged to the stacking unit 805 by the rotation of the discharge roller end 803.

  As described above, according to the present embodiment, before the paper enters the press-contact portion between the paper feed roller and the separation roller, the paper is sufficiently rolled by the subsequent separation roller by rolling the paper by the two pickup rollers in advance. Can be separated. Therefore, for example, even when a paper having a remarkable cutting burr or a paper having a strong sticking force is used, occurrence of double feeding can be suppressed.

  In this embodiment, when the second pickup roller is in a stopped state, the separation operation for forming the space G as shown in FIG. 6 is performed by rotating the first pickup roller in the medium transport direction. It was made into the form to perform. However, the present invention is not limited to this, and when feeding paper, the first pickup roller is driven at the first speed and the second pickup roller is driven at a second speed that is slower than the first speed. Thus, the separation operation for forming the space G shown in FIG. 6 may be performed. Other controls can be performed in the same manner as in the above embodiment.

  In the description of the present embodiment, the example in which the second pickup roller and the paper feed roller rotate in the same direction has been described. For example, by rotating the second pickup roller in the direction opposite to the paper transport direction. Further, it is possible to further enhance the paper-spreading effect.

  In addition, by operating the first pickup roller and the second pickup roller as normal pickup rollers, it is not possible to expect the paper to be sprinkled, but it has the effect of preventing paper non-feeding in thick paper and high humidity and high temperature environments. It can also be increased.

  Furthermore, it is also possible to adopt a configuration in which the paper feed mode described in the present embodiment and the paper feed mode described above are appropriately switched depending on the type of paper.

  In the description of the present invention, an example in which the present invention is applied to a cassette type paper tray has been described. However, the present invention is not limited to this and can be applied to a manual feed tray. In the description of the present invention, a printer has been described as a preferred example of the image forming apparatus. However, the present invention can also be applied to, for example, an MFP, a FAX, or the like.

DESCRIPTION OF SYMBOLS 10 Printer 101 Paper 102 Paper stacking tray 103 Movable paper stacking tray 104 Paper guide pair 105 Paper guide 106 Shaft 200 Paper feed / conveyance unit 201 Pickup frame 202 Spring 203 First pickup roller 204 Second pickup roller 205 Paper feed roller 206 Separating rollers 213, 214, 215 Shaft 220 Drive transmission parts 223, 224, 225 Electromagnetic clutch 234 Electromagnetic brake 400 Paper conveying part 401 Paper detecting sensor 402 Conveying roller pair 402, 403 Conveying roller pair 530A, 530B, 530C, 530D, 530E Image Formation unit 531 Photosensitive drum 532 Charging roller 533 Exposure device 534 Development roller 535 Supply roller 550 Toner cartridges 560A, 560B, 560C, 56 D, 560E Primary transfer roller 600 Intermediate transfer belt 690 Secondary transfer roller 691 Secondary transfer backup roller 692 Intermediate transfer belt drive roller 693, 694 Driven roller 700 Fixing device 700a Fixing roller 700b Backup roller 800 Paper feed / conveyance drive source 801 Control unit 803 discharge roller pair 805 stacking unit 900 medium

Claims (7)

A medium loading section for loading the medium;
A first feeding roller that contacts the medium on the medium stacking unit and feeds the medium in a transport direction;
A second feeding roller that is arranged on the downstream side of the first feeding roller in the transport direction, and abuts on the medium on the medium stacking unit and feeds the medium in the transport direction;
A medium conveying apparatus comprising: a control unit that controls driving of the first feeding roller and the second feeding roller. The controller is
When feeding the medium from the medium stacking unit,
2. The medium conveying apparatus according to claim 1, wherein driving of the first feeding roller is started in a state where the second feeding roller is stopped. 3. The controller is
When feeding the medium from the medium stacking unit,
Driving the first feeding roller at a first speed;
The medium conveying apparatus according to claim 1, wherein the second feeding roller is driven at a second speed that is slower than a speed of the first feeding roller. The medium conveying apparatus according to claim 1, further comprising a separation unit that is arranged on the downstream side of the second feeding roller in the conveying direction and separates the medium to be conveyed. A brake member for applying a load to the second feeding roller;
When there is a load due to the brake member, the traveling of the tip of the medium is stopped by the frictional force of the second feeding roller,
The medium conveyance device according to claim 1, wherein the stop of the traveling of the leading end of the medium is adjusted by a load application time by the brake member. Driven by the same drive source of the first feeding roller and the second feeding roller;
The medium conveying apparatus according to claim 1, wherein rotation and stop of each feeding roller is realized by switching a plurality of drive transmission means. An image forming apparatus comprising the medium conveying device according to claim 1.