JP2018105924A - Medium conveyance device and image formation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of setting a medium again in a medium storage part following opening/closing of a lid body unit, and prevent wasteful consumption of the medium.SOLUTION: A medium conveyance device includes a medium storage part, a medium conveyance path, a conveyance member which conveys a medium following rotation, first and second medium guide members which guide the medium, and a cutting part which is arranged on the downstream side with respect to the second medium guide member. The second medium guide member and cutting part are arranged in a device body 11, and the medium storage part and conveyance member are arranged in a lid body unit 12. The front end of the cut medium is placed at a printing standby position St1 on the medium conveyance path in the state where the lid body unit 12 is closed, and placed at a return position on the medium conveyance path in the state where the lid body unit is opened. Following opening of the lid body unit 12, the medium waiting for printing is prevented from being pulled out to the outside of the medium conveyance path.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medium conveying apparatus and an image forming apparatus.

  2. Description of the Related Art Conventionally, image forming apparatuses such as printers, copiers, facsimiles, multifunction machines, etc., for example, electrophotographic printers, are provided with an image forming unit, and a photosensitive drum, a charging roller, a developing device, etc. Is arranged. Then, the surface of the photosensitive drum uniformly charged by the charging roller is exposed by the LED head to form an electrostatic latent image, and the electrostatic latent image is developed by the toner supplied from the toner cartridge. An image is formed. The toner image is transferred onto a sheet of paper as a medium by a transfer roller, and is fixed by a fixing device, whereby an image is formed and printing is performed.

  By the way, in a printer in which roll paper as a roll-shaped medium is stored in a roll paper storage section as a medium storage section, and paper as a long medium is fed out from the roll paper storage section to a paper transport path. There has been provided a printer whose lid can be opened and closed with respect to the main body of the printer so that the consumables disposed in the main body of the printer, that is, the main body of the apparatus can be replaced (see, for example, Patent Document 1). ).

Japanese Patent No. 5267620

  However, in the above-described conventional printer, a lid unit is configured by disposing a roll paper container, a paper transport path, and the like in the lid so that the lid unit can be opened and closed with respect to the apparatus main body. Then, as the lid unit is opened, the paper that has been cut and is waiting for printing on the paper transport path is pulled out of the paper transport path.

  In this case, after closing the consumables, when the lid unit is closed, the drawn paper cannot be returned to the original position, so it is necessary to set the roll paper again in the roll paper container, Not only is it bothersome, but the paper is unnecessarily consumed when the roll paper is set again in the roll paper container.

  The present invention solves the problems of the conventional printer, and it is not necessary to set the medium again in the medium accommodating portion in accordance with opening and closing of the lid unit, and the medium conveying apparatus that does not consume the medium unnecessarily. An object of the present invention is to provide an image forming apparatus.

  For this purpose, in the medium conveying apparatus of the present invention, the medium accommodating portion for accommodating the medium, the medium conveying path for conveying the medium fed out from the medium accommodating portion, and the medium conveying path are arranged and rotated. Accordingly, a conveying member that conveys the medium, a first medium guiding member that is arranged on the downstream side of the conveying member in the medium conveying path and guides the medium, and the first medium guide in the medium conveying path. A second medium guide member that is disposed downstream of the member and guides the medium; and a cutting unit that is disposed downstream of the second medium guide member in the medium conveyance path and cuts the medium. Have

  The second medium guiding member and the cutting unit are disposed in the apparatus main body of the image forming apparatus, and the medium accommodating unit and the conveying member are disposed in a lid unit that can be opened and closed with respect to the apparatus main body.

  Further, the front end of the medium cut by the cutting unit is placed at a print standby position on the medium conveyance path in a state where the lid unit is closed, and on the medium conveyance path in a state where the lid unit is opened. Placed in the return position.

  According to the present invention, in the medium conveying apparatus, the medium accommodating portion that accommodates the medium, the medium conveying path for conveying the medium fed from the medium accommodating portion, the medium conveying path, and the rotation are arranged in the medium conveying path. Accordingly, a conveying member that conveys the medium, a first medium guiding member that is arranged on the downstream side of the conveying member in the medium conveying path and guides the medium, and the first medium guide in the medium conveying path. A second medium guide member that is disposed downstream of the member and guides the medium; and a cutting unit that is disposed downstream of the second medium guide member in the medium conveyance path and cuts the medium. Have

  The second medium guiding member and the cutting unit are disposed in the apparatus main body of the image forming apparatus, and the medium accommodating unit and the conveying member are disposed in a lid unit that can be opened and closed with respect to the apparatus main body.

  Further, the front end of the medium cut by the cutting unit is placed at a print standby position on the medium conveyance path in a state where the lid unit is closed, and on the medium conveyance path in a state where the lid unit is opened. Placed in the return position.

  In this case, the second medium guide member and the cutting unit are disposed in the apparatus main body of the image forming apparatus, and the medium storage unit and the conveying member are disposed in the lid unit that is opened and closed with respect to the apparatus main body. The front edge of the medium cut by the section is placed at the print standby position on the medium transport path with the lid unit closed, and placed at the return position on the medium transport path with the lid unit opened. It is burned.

  Therefore, when the lid unit is opened, the medium waiting to be printed on the medium conveyance path is not pulled out of the medium conveyance path. There is no need to set it again. Further, the medium is not consumed unnecessarily.

FIG. 3 is a first diagram illustrating a state of a main part of the printer when the lid unit is opened according to the first embodiment of the present invention. 1 is a perspective view of a printer according to a first embodiment of the present invention. 1 is a conceptual diagram of a printer according to a first embodiment of the present invention. 1 is a schematic diagram of a printer according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating a state where a developer image forming unit and a transfer unit in the first embodiment of the present invention are taken out from the apparatus main body. It is a 2nd figure which shows the state of a printer when the cover body unit in the 1st Embodiment of this invention is opened. It is a figure which shows the state of the principal part of a printer when the cover body unit in the 2nd Embodiment of this invention is opened. It is a figure which shows the state of the principal part of a printer when the cover body unit in the 3rd Embodiment of this invention is opened. It is a side view of the guide plate in the 3rd Embodiment of this invention. It is a top view of the guide plate in the 3rd Embodiment of this invention. It is a perspective view of the guide plate in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a printer as an image forming apparatus will be described.

  2 is a perspective view of the printer according to the first embodiment of the present invention, FIG. 3 is a conceptual diagram of the printer according to the first embodiment of the present invention, and FIG. 4 is a printer according to the first embodiment of the present invention. FIG. 5 is a diagram showing a state where the developer image forming unit and the transfer unit in the first embodiment of the present invention are taken out from the apparatus main body. 2 and 3, the X axis negative direction is the front of the printer 10, the X axis positive direction is the rear of the printer 10, the Y axis positive direction is the upward direction of the printer 10, and the Y axis negative direction is the printer 10. In the downward direction, the positive Z-axis direction indicates the left direction in the printer 10, and the negative Z-axis direction indicates the right direction in the printer 10.

  In the figure, reference numeral 10 denotes a printer. The printer 10 is swingable about a main body of the printer 10, that is, an apparatus main body 11 and an axis Cn1 that is a rotation center with respect to the apparatus main body 11, and the apparatus 10 A lid unit 12 is provided that can be opened and closed upward with respect to the main body 11.

  Further, Cs1 is a casing of the apparatus main body 11, Cs2 is a casing of the lid unit 12, and the casing Cs1 includes a front panel Wf1, a side panel Ws1, and a back panel Wr1, and the casing Cs2 is a front wall. Wf2, side wall Ws2, back wall Wr2, and top wall Wt2 are provided. The top wall Wt2 includes a main body cover Wta and a roll cover Wtb that is swingably disposed about the axis Cn2 with respect to the main body cover Wta. A medium discharge is provided at a predetermined position of the front panel Wf1. A sheet exit 13 as an exit is formed.

  The lid unit 12 is disposed immediately below the roll cover Wtb, and is disposed immediately below the roll paper storage portion 17 as a medium storage portion for storing the roll paper 16 as a roll-shaped medium, and the main body cover Wta. A paper transport unit 18 serving as a first medium transport unit for transporting the paper P as a long medium fed from the roll paper storage unit 17, and projecting downward from the paper transport unit 18. In the present embodiment, a plurality of formed hanging parts am are provided, and an LED head 22 as an exposure apparatus is disposed at the lower end of each hanging part am.

  Also, a developer image for forming a toner image as a developer image of a plurality of colors, in this embodiment, three colors of yellow, magenta, and cyan, below the paper transport unit 18 in the apparatus main body 11. A transfer unit u1 for sequentially transferring the toner images onto the paper P and forming a color toner image below the developer image forming portion Q1 in the apparatus main body 11 is formed in the apparatus main body 11. A paper transport unit 23 as a second medium transport unit for transporting the paper P sent from the paper transport unit 18 is provided behind the developer image forming unit Q1 (on the back panel Wr1 side) in the apparatus main body 11. In front of the transfer unit u1 (on the front panel Wf1 side), a paper transport unit 24 as a third medium transport unit for sending the paper P sent from the paper transport unit 23 to the paper outlet 13 is disposed. That.

  A transport roller pair 19 as a feeding member is rotatably disposed at a location adjacent to the front wall Wf2 in the roll paper storage unit 17, and the roll paper storage unit 17 is rotated by rotating the transport roller pair 19. Roll paper 16 is fed out to a paper transport path Rt1 as a medium transport path.

  The paper transport path Rt1 is formed so that the paper P is transported through the paper transport units 18 and 23, the developer image forming unit Q1 and the transfer unit u1, and the paper transport unit 24.

  In the paper transport path Rt1, a pair of transport rollers 20 as a first transport member is rotatably disposed at a location adjacent to the roll paper storage unit 17, and the second transport is downstream from the transport roller pair 20. A conveying roller pair 21 as a member is rotatably arranged, and a guide as a first medium guiding member that guides the paper P downstream from the conveying roller pair 21 and adjacent to the conveying roller pair 21. A pair g1 is disposed. The sheet P is transported with the rotation of the transport roller pair 20 and 21, and the transport direction by the guide pair g1 is changed by 90 [°].

  In the paper transport path Rt1, a transport roller pair 25 as a third transport member is rotatably disposed downstream of the guide pair g1, and the paper P is guided downstream of the transport roller pair 25. A guide pair g2 as a second medium guide member is disposed, a cutter unit 26 as a cutting portion is disposed downstream of the guide pair g2, and a fourth transport member is disposed downstream of the cutter unit 26. As a third medium guide member for guiding the paper P, a pair of guide rollers g3 is disposed on the downstream side of the pair of transport rollers 27. The sheet P is transported with the rotation of the transport roller pair 25, 27, and the transport direction by the guide pair g3 is changed by 90 [°]. The guide pair g3 is provided with a writing sensor Sr1 as a first detection unit for detecting the front end of the paper P.

  A transfer unit is disposed on the downstream side of the guide pair g3 in the paper transport path Rt1 and between the developer image forming unit Q1 and the transfer unit u1, and on the downstream side of the transfer unit. And a discharge sensor Sr2 as a second detection unit for detecting the front end of the paper P is provided downstream of the fixer 45, and downstream of the discharge sensor Sr2. A pair of discharge rollers 46 as discharge members for feeding the paper P to the paper outlet 13 is rotatably arranged.

  The guide pair g1 is a first guide ga that is curved outside the paper transport path Rt1, a second guide gb that is formed close to the transport roller pair 21 inside the paper transport path Rt1, and A third guide gc is provided that is curved downstream from the second guide gb on the inner side of the paper transport path Rt1 and close to the transport roller pair 25. The guide pair g2 includes a first guide gd formed outside the paper transport path Rt1 and a second guide ge formed inside the paper transport path Rt1. The guide pair g3 includes a first guide gf formed to be curved outward from the paper transport path Rt1 and a second guide gg formed to be curved inward from the paper transport path Rt1.

  The conveyance roller pair 25 includes a first conveyance roller 25a disposed outside the paper conveyance path Rt1 and a second conveyance roller 25b disposed inside the paper conveyance path Rt1.

  The developer image forming portion Q1 includes image forming units 31Y, 31M, and 31C for each color of yellow, magenta, and cyan, which are detachably disposed adjacent to the apparatus main body 11 from the rear to the front.

  The cutter unit 26 is a rotary cutter, and cuts the paper P by moving it in the width direction of the paper P while rotating a rotary blade (not shown).

  Each of the image forming units 31Y, 31M, and 31C includes a photosensitive drum 32 as an image carrier that is rotatably arranged, and charging as a charging device that is rotatably arranged in contact with the photosensitive drum 32. A developing roller 35 as a developer carrying member rotatably disposed in contact with the roller 33 and the photosensitive drum 32; and a developer supply member rotatably disposed in pressure contact with the developing roller 35 A toner supply roller 36 and a toner cartridge 39 as a developer container that is disposed on the toner supply roller 36 and stores toner as a developer of each color are provided.

  In each of the image forming units 31Y, 31M, and 31C, as the photosensitive drum 32 is rotated, the charging roller 33 is rotated, and the surface of the photosensitive drum 32 is uniformly charged. The surface of the photosensitive drum 32 is exposed by the LED head 22, and an electrostatic latent image as a latent image is formed.

  Further, as the photosensitive drum 32 is rotated, the developing roller 35 and the toner supply roller 36 are rotated, and the toner supplied from the toner cartridge 39 is supplied to the developing roller 35 by the toner supply roller 36. A toner layer is formed on the developing roller 35.

  Then, the toner on the developing roller 35 is attached to the electrostatic latent image, and a toner image of each color is formed on the photosensitive drum 32.

  The transfer unit u1 is a driving roller r1 as a first roller, a driven roller r2 as a second roller, a traveling member stretched in the direction of arrow e by the driving roller r1 and the driven roller r2. The image forming apparatus includes a transfer belt 41 and a transfer roller 43 as a transfer member that is arranged to face each photoconductor drum 32 through the transfer belt 41 and transfers a toner image of each color onto the paper P.

  The fixing device 45 includes a heating roller 48 as a first fixing member and a pressure roller 49 as a second fixing member, and heats and presses the color toner image on the paper P, so that color Form an image.

  The printer 10 includes a first conveyance motor (not shown) as a first conveyance drive unit for rotating the conveyance roller pairs 19 to 21 and 25, the conveyance roller pair 27 and the discharge roller pair. A second conveyance motor (not shown) as a second conveyance drive unit for rotating 46 is a cutter motor (not shown) as a cutting drive unit for rotating the rotary blade in the cutter unit 26. In the developer image forming section Q1, a drum motor (not shown) as an image forming drive section for rotating the photosensitive drum 32, the charging roller 33, the developing roller 35, and the toner supply roller 36 is provided in the transfer unit u1. A transfer motor (not shown) as a transfer drive unit for rotating the drive roller r1 and the transfer roller 43 is provided with the fixing unit. In 45, the fixing motor such as a driving portion for fixing for rotating the heating roller 48 and the pressure roller 49 is disposed.

  The roll paper storage unit 17, the conveyance roller pairs 19 to 21, 25, 27, the cutter unit 26, the discharge roller pair 46, the guide pairs g1 to g3, the paper conveyance path Rt1, and the like constitute a medium conveyance device.

  In the printer 10 having the above-described configuration, the sheet P fed from the roll paper storage unit 17 to the paper transport unit Rt1 as the transport roller pair 19 disposed adjacent to the roll paper storage unit 17 is rotated. Then, the sheet is conveyed by a pair of conveying rollers 20, 21, 25 and is cut into a predetermined length by a cutter unit 26.

  The sheet P that has been cut into a single sheet is transported by the transport roller pair 27 and sent to the transfer unit, and the toner image of each color on the photosensitive drum 32 is moved along with the running of the transfer belt 41 in the transfer unit. Are sequentially transferred onto the paper P, and a color toner image is formed on the paper P.

  Subsequently, the paper P is sent to the fixing device 45, where the color toner image is heated and pressed to be fixed on the paper P, and a color image is formed on the paper P. The paper P printed in this way is discharged out of the apparatus main body 11 from the paper outlet 13 by the discharge roller pair 46.

  The paper P after being cut is in a state in which the front end is placed at the print standby position St1 between the cutter unit 26 and the transport roller pair 27 in a state where the lid unit 12 is closed, and printing is waited. That is, when printing is started and printing is started, it is transported by the transport roller pair 27 and sent to the transfer section. The print standby position St1 is set according to the position of the cutter unit 26 on the paper transport path Rt1.

  By the way, the developer image forming portion Q1, the transfer unit u1, etc. are consumables, and the developer image forming portion Q1, the transfer unit u1, etc. are deteriorated or the image forming units 31Y, 31M in the developer image forming portion Q1. When the toner in the 31C toner cartridge 39 runs out, printing is stopped. In the present embodiment, as shown in FIG. 5, the lid unit 12 can be opened by being rotated at an angle of 90 [°] or more, in this embodiment, 97 [°]. The developer image forming portion Q1, the transfer unit u1, etc. can be taken out and the image forming units 31Y, 31M, 31C, the transfer unit u1, etc. can be replaced with new ones.

  Further, even when the paper P is jammed in the apparatus main body 11 and printing is stopped, the lid unit 12 is opened, the developer image forming unit Q1, the transfer unit u1, etc. are taken out, and the paper P is jammed. Can be resolved.

  However, the roll paper storage unit 17 and the paper transport unit 18 are disposed in the lid unit 12, the roll paper 16 is stored in the roll paper storage unit 17, and the paper P is transported through the paper transport unit 18. Therefore, as the lid unit 12 is opened, the paper P in the paper transport unit 23 is pulled toward the paper transport unit 18, and the front end of the paper P is pulled out of the paper transport path Rt 1. When the body unit 12 is closed, the paper P cannot be returned to the original position.

  Therefore, in the present embodiment, the paper P can be returned to the original position when the opened lid unit 12 is closed.

  FIG. 1 is a first view showing a state of a main part of a printer when a lid unit according to the first embodiment of the present invention is opened, and FIG. 6 is a lid body according to the first embodiment of the present invention. It is a 2nd figure which shows the state of a printer when a unit is opened.

  In the figure, P is paper, 10 is a printer, 11 is an apparatus body, 12 is a lid unit, Q1 is a developer image forming unit, u1 is a transfer unit, 18 and 23 are paper conveyance units, and 21, 25 and 27 are conveyances. A roller pair, Rt1 is a paper transport path, Cn1 is a shaft that supports the lid unit 12 with respect to the apparatus main body 11 between the back panel Wr1 and the paper transport unit 23, am is a hanging part, and 22 is an LED head. is there.

  As shown in the figure, when the lid unit 12 is rotated by 97 [°] around the axis Cn1 and opened, the drooping portion am is separated from the apparatus main body 11 with the rotation of the lid unit 12, and is almost Placed horizontally.

  At this time, the LED head 22 is retracted to the outside of the apparatus main body 11 by a distance ε from the inner peripheral wall Win of the apparatus main body 11. Accordingly, with the lid unit 12 opened, as shown in FIG. 6, the developer image forming portion Q1, the transfer unit u1, etc. can be taken out from the apparatus main body 11 without interfering with the LED head 22, or the apparatus It can be set on the main body 11.

  Further, in the guide pair g1 (FIG. 4), the first and second guides ga and gb are formed in the lid unit 12, and the third guide gc is formed in the apparatus main body 11.

  In the transport roller pair 25, the first transport roller 25 a is formed on the lid unit 12, and the second transport roller 25 b is formed on the apparatus main body 11.

  Therefore, as the lid unit 12 is opened, the guides ga and gb are separated from the guide gc, and the first conveyance roller 25a is separated from the second conveyance roller 25b. In addition, the sheet P positioned between the guides ga and gb and the guide gc in the guide pair g1 in a state where the lid unit 12 is closed is guided by the guide gc as the lid unit 12 is opened. It is moved on the circumference of the rotation radius r1 together with the lid unit 12 in a state of being separated from the guide ga and gb. That is, the sheet P is moved following the lid unit 12 without being interfered by the guide pair g1 and the transport roller pair 25.

  At this time, the conveyance roller pair 21 is stopped with the stop of printing, and the sheet P is sandwiched by the conveyance roller pair 21 with a predetermined pressure, and the movement of the sheet P is prevented. When the lid unit 12 is completely opened by being pulled by the guide 21, the cover unit 12 extends substantially horizontally between the outlet between the guides ga and gb and the inlet of the guide pair g <b> 2 formed in the paper transport unit 23. . Then, the sheet P is retracted from the print standby position St1 in a state where the lid unit 12 is opened, and the front end is a return position St2 between the transport roller pair 25 and the cutter unit 26 on the paper transport path Rt1. Placed in. In the present embodiment, since the return position St2 is placed on the paper transport path Rt1, the front end of the paper P is not pulled out of the paper transport path Rt1.

Here, in a state where the lid unit 12 is closed, a point on the lid unit 12 where a predetermined part of the paper P is placed, in the present embodiment, on the side of the conveying roller pair 25 of the second guide gb. A point on the lid unit 12 where the predetermined portion of the paper P is placed in a state where the end portion eg1 is set as the first position S1 and the lid unit 12 is opened. , The point where the end part eg1 of the guide gb on the conveying roller pair 25 side is placed is the second position S2, and the position of the entrance of the guide pair g2 in the sheet conveying part 23 is the third position S3. The distance on the paper transport path Rt1 between the positions S1 and S3 is L1, the distance on the straight line between the second and third positions S2 and S3 is L2, and the distance between the print standby position St1 and the return position St2 is By opening the lid unit 12, the paper P Distance front end is moved, i.e., when the return amount B, 該戻Ri amount B is
B = L2-L1
Can be expressed as Note that the return amount B is preferably calculated by subtracting the distance L1 from the length of the paper P between the second and third positions S2 and S3, but the paper P depends on the stiffness of the paper P. Therefore, the length of the sheet P is approximated by a distance L2 on a straight line between the second and third positions S2 and S3.

When the distance between the third position S3 and the print standby position St1 is L3, the distance L3 is longer than the return amount B by the distance C.
L3 = B + C
> L2-L1
When the first to third positions S1 to S3 and the print standby position St1 are set so that the return position St2 that is the position of the front end of the paper P is opened when the lid unit 12 is opened, the paper transport path It can be placed on Rt1, and the front end of the paper P can be prevented from being pulled out of the paper transport path Rt1.

  In addition, since it became clear by experiment that it was necessary to set the distance C to 5 [mm] or more, in this Embodiment, the distance C was set to 11 [mm].

The second position S2 is equal to or higher than the third position S3. The height of the second position S2 with respect to the position of the axis Cn1, where θ1 is the angle formed by the line connecting the axis Cn1 and the second position S2 with the horizontal direction in the state in which the lid unit 12 is opened. H1 is
H1 = r1 · sin θ
It is represented by When the height of the third position S3 relative to the position of the axis Cn1 is H2, the height H1 of the second position S2 is
H1 ≧ H2
To be.

  Thereby, when closing the lid unit 12, the paper P extended between the second and third positions S2 and S3 is utilized on the paper transport path Rt1 using the stiffness of the paper P. It can be returned to the position. In the present embodiment, since the first guide gd of the guide pair g2 is curved toward the back panel Wr1, the paper P can be smoothly returned to the original position on the paper transport path Rt1. .

  Thus, in the present embodiment, the front end of the paper P cut by the cutter unit 26 is placed at the print standby position St1 on the paper transport path Rt1 in a state where the lid unit 12 is closed. Since the lid unit 12 is opened, it is placed at the return position St2 on the paper transport path Rt1, so that the paper waiting for printing on the paper transport path Rt1 as the lid unit 12 is opened. It is possible to prevent the sheet from being pulled out of the sheet conveyance path Rt1. Therefore, the paper P can be returned to the original position when the lid unit 12 is closed. As a result, it is not necessary to set the roll paper 16 (FIG. 4) in the roll paper storage unit 17 again. Further, the paper P is not consumed unnecessarily.

  By the way, in the present embodiment, when the lid unit 12 is opened, the paper P extends substantially horizontally between the second and third positions S2 and S3. However, if the paper P is strong, In the guide pair g1, the sheet P cannot be sufficiently curved by the first guide ga, and it becomes difficult to extend substantially horizontally between the second and third positions S2 and S3. In that case, the paper P extended between the second and third positions S2 and S3 becomes longer, the return position St2 becomes higher, and the paper P can be returned to the original position when the lid unit 12 is closed. Can not.

  Accordingly, a second embodiment of the present invention will be described in which the paper P can be reliably returned to the original position even when the paper P having a strong stiffness is used. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 7 is a diagram illustrating a state of a main part of the printer when the lid unit is opened according to the second embodiment of the present invention.

  In the figure, P is a sheet as a long medium, 10 is a printer as an image forming apparatus, 11 is an apparatus main body, 12 is a lid unit, and 18 and 23 are sheets as first and second medium transport units. Reference numerals 21, 25, and 27 denote a pair of conveyance rollers as second to fourth conveyance members, 25 a denotes a first conveyance roller, 25 b denotes a second conveyance roller, and Rt 1 denotes a paper conveyance path as a medium conveyance path. is there.

  In the present embodiment, the paper P is strong and has a thickness of 120 [μm] or more, or a thickness of less than 120 [μm], but the state of the roll paper 16 as a roll-shaped medium The one with the remaining curl is used.

  In this case, a predetermined portion of the first guide ga of the guide pair g1 as the first medium guide member, in the present embodiment, faces the second guide gb in the length direction of the first guide ga. A guide film 81 as a support member and as a medium deflecting member is attached to a central portion in the width direction of the first guide ga (a paper width center that is a central portion in the width direction of the paper P). It is done. The guide film 81 is projected a predetermined amount toward the guide pair g2 as the second medium guide member in a state where the lid unit 12 is closed.

  In the present embodiment, as the guide film 81, a resin film having a thickness of 0.25 [mm] and a width of 30 [mm] is used.

  The guide film 81 hangs down toward the third position S3 in a state where the lid unit 12 is closed, guides the paper P to bend, and in a state where the lid unit 12 is opened. 3 is extended in the horizontal direction toward position S3, and the paper P is pushed up and supported. The tip of the guide film 81 at this time is placed below the line segment connecting the second and third positions S2 and S3, and the elastic holding force by the guide film 81 is about 15 [gf].

  Thus, when the lid unit 12 is opened, the paper P can be sufficiently curved by the guide film 81 and can be extended substantially horizontally between the positions S2 and S3. As a result, when the lid unit 12 is closed, the paper P can be reliably returned to the original position.

  By the way, in the present embodiment, since the guide film 81 is suspended toward the third position S3 in a state where the lid unit 12 is closed, the guide film 81 comes into contact with the paper P, and the first film A load is applied to the first conveyance motor as the conveyance drive unit.

  Therefore, even when a strong paper P is used, the paper P can be reliably returned to the original position without applying a load to the first transport motor. A form is demonstrated. In addition, about the thing which has the same structure as 1st, 2nd embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 8 is a diagram showing a state of the main part of the printer when the lid unit is opened in the third embodiment of the present invention, and FIG. 9 is a side view of the guide plate in the third embodiment of the present invention. FIG. 10 is a plan view of a guide plate according to the third embodiment of the present invention, and FIG. 11 is a perspective view of the guide plate according to the third embodiment of the present invention.

  In this case, a predetermined portion of the first guide ga of the guide pair g1 as the first medium guiding member, in the present embodiment, the second and third guides gb in the length direction of the first guide ga. , Gc, and the entire area in the width direction of the first guide ga (the entire area in the width direction of the sheet P as a long medium) as a support member and as a medium deflection member A guide plate 82 is disposed so as to be swingable with respect to the axis Cn3.

  The guide plate 82 is urged by a spring (not shown) as an urging member outside the width direction range of the paper P, and in the horizontal direction toward the third position S3 with the lid unit 12 opened. The paper P is pushed up and supported. The tip of the guide plate 82 at this time is placed below the line segment connecting the second and third positions S2 and S3, and the spring holding force by a spring (not shown) for supporting the paper P is 30 [gf]. To a degree.

  In addition, the guide plate 82 is suspended toward the third position S3 in a state where the lid unit 12 is closed, and guides the paper P by curving it. In addition, the protrusions as a pair of restricting members on both edges of the leading end of the guide plate 82 outside the width direction range of the paper P so that the guide plate 82 does not block the paper conveyance path Rt1 by the urging force of the spring. 85 is disposed, and the protrusion 85 contacts the guide gc, whereby the swing range of the guide plate 82 is restricted. Since the paper P can be smoothly transported along the guide plate 82, a load is not applied to the first transport motor.

  Thus, in the present embodiment, since the guide plate 82 is disposed in the first guide ga, the paper P can be sufficiently curved by the guide plate 82 when the lid unit 12 is opened. And can extend substantially horizontally between the second and third positions S2, S3. As a result, when the lid unit 12 is closed, the paper P can be reliably returned to the original position on the paper transport path Rt1.

  In addition, since the guide plate 82 does not block the paper transport path Rt1 when the lid unit 12 is closed, no load is applied to the first transport motor.

  In each of the above-described embodiments, the roll paper storage unit 17 is provided as a medium storage unit, and printing is performed on the paper P as a long medium fed out from the roll paper storage unit 17. However, printing can be performed on a long cut sheet as a long medium.

  In each of the above embodiments, the printer 10 including the three image forming units 31Y, 31M, and 31C (FIG. 3) has been described. However, the present invention includes only one image forming unit. The present invention can be applied to a printer having four or more image forming units.

  Further, in each of the above embodiments, the toner image as the developer image on the photosensitive drum 32 as the image carrier is transferred to the paper P in the transfer unit. And a secondary transfer unit, the toner image on the photosensitive drum 32 is transferred to the intermediate transfer medium in the primary transfer unit, and the toner image on the intermediate transfer medium is transferred to the paper in the secondary transfer unit. be able to.

  The present invention can be applied to an image forming apparatus such as a copying machine, a facsimile machine, and a multifunction machine.

  The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention, and they are not excluded from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Printer 11 Apparatus main body 12 Cover unit 16 Roll paper 17 Roll paper accommodating part 21 Conveyance roller pair 26 Cutter unit g1, g2 Guide pair P Paper Rt1 Paper conveyance path St1 Print standby position St2 Return position

Claims (11)

(A) a medium accommodating portion for accommodating a medium;
(B) a medium conveyance path for conveying the medium fed out from the medium container;
(C) a conveying member that is disposed in the medium conveying path and conveys the medium as it rotates,
(D) a first medium guiding member that is disposed on the downstream side of the conveying member in the medium conveying path and guides the medium;
(E) a second medium guide member that is disposed downstream of the first medium guide member in the medium conveyance path and guides the medium;
(F) having a cutting portion disposed on the downstream side of the second medium guide member in the medium conveyance path and for cutting the medium;
(G) The second medium guide member and the cutting unit are disposed in an apparatus main body of the image forming apparatus, and the medium storage unit and the conveying member are disposed in a lid unit that is opened and closed with respect to the apparatus main body.
(H) The front end of the medium cut by the cutting unit is placed at a print standby position on the medium conveyance path in a state where the lid unit is closed, and is on the medium conveyance path in a state where the lid unit is opened. A medium conveying apparatus, wherein the medium conveying apparatus is placed at a return position.   A point on the lid unit that is set on the downstream side of the transport member in the medium transport path and in which the lid unit is closed is a first position on the lid unit where the predetermined part of the medium is placed. In the opened state, when the point on the lid unit where the predetermined part of the medium is placed is the second position, and the entrance position of the second medium guide member is the third position, the second position The medium conveying apparatus according to claim 1, wherein the position is equal to or higher than the third position. The distance on the medium conveyance path between the first and third positions is L1, the distance between the second and third positions is L2, and the distance between the third position and the print standby position is L3. When the distance L3 is
L3> L2-L1
The medium carrying device according to claim 2 made. (A) the first medium guide member is a first guide disposed outside the medium transport path, a second guide disposed near the transport member inside the medium transport path, and A third guide disposed downstream of the second guide inside the medium conveyance path;
(B) The medium conveying apparatus according to any one of claims 1 to 3, wherein the first and second guides are disposed in the lid unit, and the third guide is disposed in the apparatus main body. (A) a conveying member is disposed between the first and second medium guiding members in the medium conveying path;
(B) The conveying member disposed between the first and second medium guiding members includes a first conveying roller disposed outside the medium conveying path and a first conveying roller disposed inside the medium conveying path. 2 transport rollers,
(C) The medium conveying apparatus according to any one of claims 1 to 4, wherein the first conveying roller is disposed in the lid unit, and the second conveying roller is disposed in the apparatus main body.   The medium transport apparatus according to claim 1, wherein the rotation center of the lid unit is disposed between a housing of the apparatus main body and a medium transport path.   The medium transport apparatus according to any one of claims 1 to 6, wherein a support member that supports a medium is disposed on the first medium guide member in a state where the lid unit is opened.   The medium conveying apparatus according to claim 7, wherein the support member is disposed in the first guide.   The medium conveying apparatus according to claim 8, wherein the support member is a guide film.   The medium conveying apparatus according to claim 8, wherein the support member is a guide plate that is swingably disposed.   An image forming apparatus comprising the medium conveying device according to claim 1.

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