JP2011102026A - Printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more effectively prevent ink retransfer to printing paper from a press roller or the like by a simple configuration in a printing device for performing double-sided printing. <P>SOLUTION: A printing device includes a roller member 52 that contacts with a printing surface of one-side printed paper in which one surface of the printing paper is printed. The printing device includes: a cleaning roller member 54 that contacts with the roller member 52 and to which attached matter attached to the roller member 52 is transferred; and a scraping-off member 55 for scraping off the attached matter transferred to the cleaning roller member 54. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a printing apparatus that performs double-sided printing on a printing paper and includes a roller member that contacts a printing surface of a single-side printed paper that has been printed on one side of the printing paper. is there.

  Conventionally, a thermal head or the like is driven based on image data read from a document by a scanner or the like, and a stencil sheet is melted and perforated to create a plate, and the created plate is wound around a printing drum. Various stencil printing apparatuses that perform printing by supplying ink from the inside of the printing drum and transferring the ink to printing paper using rollers or the like have been proposed.

  As a stencil printing apparatus as described above, for example, Patent Document 1 proposes a stencil printing apparatus for double-sided printing that includes two printing drums. Specifically, the stencil printing apparatus for double-sided printing described in Patent Document 1 performs printing on one side of a printing paper by a first printing drum, and the unprinted side of the printing paper on one side is the second. After the single-sided printed paper is reversed and conveyed so as to face the printing drum, printing is performed on the unprinted side of the single-sided printed paper by the second printing drum.

  Here, in the stencil printing apparatus for double-sided printing described in Patent Document 1, after the printing on one side is completed by the first printing drum, the other side is not fully dried before the ink on the printing side is sufficiently dried. Since printing is performed, the ink on the printing surface of the printing paper is transferred to the conveyance roller, press roller, etc. on the paper passing path after reversing the printing paper, and the ink is transferred from these rollers to the subsequent printing paper. It will re-transfer.

  Therefore, in order to prevent the re-transfer of the ink as described above, the stencil printing apparatus for double-sided printing disclosed in Patent Document 2 removes ink stains on the surface of the press roller that presses the second printing drum. It has been proposed to provide a cleaning roller for this purpose.

JP 2005-29375 A JP 2004-338234 A

However, for example, when excessive ink adheres to the surface of the press roller, or when a large amount of double-sided printing is performed using printing paper that easily generates paper dust, the paper is removed when the paper is fed away. Since powder is generated and conveyed to the press roller with paper dust remaining on the printing paper, the ink and paper powder on the surface of the press roller are mixed to produce a viscous mixture,
The mixture adheres to the press roller surface. Further, the mixture is deposited on the surface of the press roller by being pressed by the press pressure, and the mixture is transferred to the cleaning roller. Therefore, the mixture is also deposited on the cleaning roller, and the cleaning roller cleans the press roller. It will no longer function.

  Further, in the stencil printing apparatus using the press roller as described above, the printing operation has been speeded up. With this speeding up, the press roller is lighter and has a shock when contacting and releasing the printing drum. What has less is desired. Further, in the stencil printing apparatus for double-sided printing as described above, in consideration of the peeling performance of the printing paper from the printing drum, the second printing drum side rather than the pressing of the press roller on the first printing drum side It is conceivable to set the pressure of the press roller lower.

  However, if a lightweight press roller is used as described above, or if the pressure of the press roller to the printing drum is set low, the press roller is likely to run out when the press roller is released from the printing drum, and again When the press roller is brought into contact with the printing drum, it does not come in contact with the printing drum in parallel, and a density difference is likely to occur in the printing result.

  In view of the above circumstances, the present invention provides a printing apparatus that performs double-sided printing, and can more effectively prevent retransfer of ink from a press roller or the like to printing paper with a simple configuration. It is for the purpose.

  It is another object of the present invention to provide a printing apparatus that can prevent a density difference from being caused by the above-described ramping of a press roller.

  A printing apparatus of the present invention is a printing apparatus that performs double-sided printing on a printing paper, and includes a roller member that contacts a printing surface of a single-side printed paper that has been printed on one side of the printing paper And a cleaning roller member that comes into contact with the roller member and transfers the deposits adhered to the roller member, and a scraping member for scraping the deposits transferred to the cleaning roller member.

  Moreover, in the printing apparatus of the said invention, the printing drum which performs printing on the other unprinted surface of a single-sided printed paper can be provided, and the press roller pressed with respect to a printing drum can be provided as a roller member.

  Further, the friction coefficient of the surface of the cleaning roller member can be made larger than the friction coefficient of the surface of the roller member.

  Further, the water repellency or oil repellency of the surface of the roller member can be made higher than the water repellency or oil repellency of the cleaning roller member.

  Moreover, a plate-shaped member can be utilized as a scraping member.

  A printing apparatus according to the present invention is a printing apparatus that performs double-sided printing on a printing paper, and includes a roller member that contacts a printing surface of a single-side printed paper after printing on one side of the printing paper. The printing apparatus is characterized by including a scraping member for scraping off deposits attached to the roller member.

  In the printing apparatus of the present invention, the cleaning roller member can have higher rigidity than the press roller.

  Further, the rotation axis center of the printing drum, the rotation axis center of the press roller, and the rotation axis center of the cleaning roller member can be arranged on a vertical line.

  According to the printing apparatus of the present invention, the cleaning roller member that comes into contact with the roller member and transfers the deposit attached to the roller member and the scraping member for scraping the deposit transferred to the cleaning roller member are provided. As a result, the deposit on the surface of the cleaning roller member can be scraped off by the scraping member, and the surface of the cleaning roller member can be made clean. The composite can be more effectively transferred to the cleaning roller member, thereby preventing the retransfer of ink from the roller member to the printing paper more effectively.

  Also, when the friction coefficient of the surface of the cleaning roller member is made larger than the friction coefficient of the surface of the roller member, the water repellency or oil repellency of the surface of the roller member is changed to the water repellency or oil repellency of the cleaning roller member. When the height is made higher than this, transfer of deposits from the roller member to the cleaning roller member can be further promoted.

  In addition, a scraping member for scraping off the adhering matter may be directly provided on the roller member, and this can more effectively prevent retransfer of ink from the roller member to the printing paper. .

  In addition, when the friction coefficient of the surface of the roller member is lowered, it becomes difficult to transmit the load torque of the cleaning roller to the roller member. For example, the load on the stencil stencil sheet that has been stenciled on the printing drum is reduced. It is possible to reduce so-called master leakage and master elongation.

  Further, in the printing apparatus of the present invention, when the cleaning roller member has higher rigidity than the press roller, the cleaning roller member can suppress the bending that occurs when the press roller is detached from the printing drum. it can.

  In addition, when the rotation axis center of the printing drum, the rotation axis center of the press roller, and the rotation axis center of the cleaning roller member are arranged on a vertical line, it is possible to more effectively suppress the deflection of the press roller. it can.

1 is an overall schematic configuration diagram of a stencil printing apparatus using an embodiment of a printing apparatus of the present invention. The figure which shows schematic structure of the cleaning mechanism of the press roller in the stencil printing apparatus shown in FIG. Graph showing experimental data on the relationship between the friction coefficient of the press roller surface and master slip The figure for demonstrating an effect | action of the cleaning mechanism of the press roller shown in FIG.

  Hereinafter, a stencil printing apparatus using an embodiment of a printing apparatus of the present invention will be described in detail with reference to the drawings. The stencil printing apparatus of the present embodiment is characterized by a press roller cleaning mechanism. First, the overall schematic configuration will be described. FIG. 1 is a schematic configuration diagram of the entire stencil printing apparatus of the present embodiment.

  As shown in FIG. 1, the stencil printing apparatus 1 of the present embodiment reads an image of a document and outputs image data, and the stencil sheet M is printed on the stencil sheet M based on the image data read by the image reading unit 10. The first and second plate making sections 30 and 35 to which the plate making process is performed, and the first and second plate printing sheets P1 are printed using the stencil sheet M made by the first and second plate making sections 30 and 35. The printing units 40 and 50, the paper feeding unit 20 that feeds the printing paper P1 to the first printing unit 40, and the printing paper P2 that has been printed on one side in the first printing unit 40 are temporarily stocked, and then at a predetermined timing. An intermediate stock unit 46 that feeds paper to the second printing unit 50 and a paper discharge unit 70 that discharges the printing paper P3 printed on both sides by the second printing unit 50 are provided.

  The image reading unit 10 includes a line image sensor that photoelectrically reads image information of an original, scans the original with the line image sensor, and outputs image data.

  The first plate making unit 30 has a thermal head 31 in which a plurality of heating elements are arranged in a line, and performs a plate making process on the stencil sheet M fed from a stencil sheet roll using the thermal head 31. Is.

  Similarly to the first plate making unit 30, the second plate making unit 35 has a thermal head 36, and performs the plate making process on the stencil sheet M fed from the stencil sheet roll using the thermal head 36. is there.

  The first printing unit 40 presses the printing paper P1 and the first printing drum 41 with a predetermined press pressure against the first printing drum 41 having a cylindrical shape such as a perforated metal plate or a mesh structure. A first press roller 42 and a first stripping claw 43 for stripping the single-side printed paper P2 from the first printing drum 41 are provided. A pre-made stencil sheet M perforated in the first plate making unit 30 is wound around and attached to the outer periphery of the first printing drum 41. The first press roller 42 extends along the direction in which the central axis of the cylinder of the first printing drum 41 extends (the thickness direction in FIG. 1).

  Similarly to the first printing unit 40, the second printing unit 50 is configured to press the cylindrical second printing drum 51 and the printing paper P2 against the second printing drum 51 with a predetermined press pressure. A press roller 52, a second stripping claw 53 for stripping the double-sided printed printing paper P3 from the second printing drum 51, a cleaning roller 54 to which deposits attached to the second press roller 52 are transferred, And a plate-like member 55 for scraping off deposits transferred to the cleaning roller 54.

  A pre-made stencil sheet M perforated by the second plate making unit 35 is wound around and attached to the outer periphery of the second printing drum 51. Further, the second press roller 52, the cleaning roller 54, and the plate-like member 55 are extended along the direction in which the central axis of the cylinder of the second printing drum 51 extends (the paper surface thickness direction in FIG. 1). .

  Here, the cleaning mechanism including the cleaning roller 54 and the plate-like member 55 will be described in detail with reference to FIG.

  The cleaning mechanism of the present embodiment is attached to an attachment member 56 attached to the stencil printing apparatus main body and to the attachment member 56 so as to be rotatable about the rotation shaft 56b as a central axis, and the cleaning roller 54 is provided to be rotatable. A cleaning roller installation member 57, and a blade installation member 58 that is rotatably attached to the cleaning roller installation member 57 with the rotation shaft 57a as a central axis, and on which the plate-like member 55 is fixed. ing.

  A spring member 56 a is attached to the rotation shaft 56 b of the attachment member 56, one end of the spring member 56 a is fixed to the attachment member 56, and the other end is fixed to the cleaning roller installation member 57. Then, the cleaning roller installation member 57 is lifted in the direction of arrow A in FIG. 2 by the elastic force of the spring member 56a, whereby the cleaning roller 54 presses the surface of the second press roller 52 in the direction of arrow B. Has been. Note that the second press roller 52 and the cleaning roller 54 are not provided with a rotation driving mechanism, and the second printing drum 51 is pressed against the second printing drum 51 by being rotated by a predetermined rotation driving mechanism. The second press roller 52 is driven to follow it, and the cleaning roller 54 is also driven to follow when the second press roller 52 rotates.

  Further, a spring member 57 b is attached to the rotation shaft 57 a of the blade installation member 58, one end of the spring member 57 b is fixed to the cleaning roller installation member 57, and the other end is fixed to the blade installation member 58. Then, the blade installation member 58 is lifted in the direction of arrow C in FIG. 2 by the elastic force of the spring member 57 b, and one end of the plate-like member 55 is in contact with the surface of the cleaning roller 54.

  The cleaning roller 54 is made of a material whose surface friction coefficient μc is larger than the surface friction coefficient μp of the second press roller 52. For example, NBR rubber (nitrile rubber) can be used as the cleaning roller 54, and a fluorine-based tube can be used as the surface member of the second press roller 52. As the friction coefficient, for example, the friction coefficient μc = 1.3 and the friction coefficient μp = 0.3.

  The reason why the friction coefficient of the cleaning roller 54 and the friction coefficient of the second press roller 52 are set as described above is to make it easier to transfer the dirt on the surface of the second press roller 52 to the surface of the cleaning roller 54. In addition, the reason for reducing the coefficient of friction of the surface of the second press roller 52 is as follows.

  When the configuration in which the cleaning roller 54 and the plate-like member 55 are provided for the second press roller 52 as in the present embodiment, the rotation of the second press roller 52 is not free, and the cleaning roller 54 When the second press roller 52 is loaded (brake) by the plate member 55 and the second press roller 52 presses the second printing drum 51, the printing paper and the stencil stencil sheet are made. Will give back tension.

  When a rubber material such as NBR is used as the surface material of the second press roller 52, for example, the above-described back tension is increased because the friction coefficient is high.

  When the printing operation is performed in a state where the back tension is applied to the printing paper and the stencil stencil sheet in this way, the stencil stencil sheet which is stenciled on the second printing drum 51 moves in the ground direction, so-called master. Omission occurs or the pre-made stencil sheet is stretched and so-called master elongation occurs. Furthermore, there is a possibility that the prepressed stencil sheet may be damaged. When the number of printed sheets is from several tens to several hundreds, such a phenomenon becomes remarkable, which causes a decrease in printing durability.

  Therefore, in order to prevent the above-described master omission, it is desirable to use a second press roller 52 having a low friction coefficient. FIG. 3 shows experimental data on the relationship between the friction coefficient of the surface of the second press roller 52 and master omission. The experimental data in FIG. 3 is a master when 1000 sheets of printing paper (Ideal Science Co., Ltd .: ideal paper, thin mouth, A3 size) are printed using NBR rubber and a fluorine-based tube as the second press roller 52. It is the result of measuring the amount of omission. As a condition for removing the master, if it is 1 mm / 1000 sheets or less, it can be said that it is within a practical range. Therefore, the friction coefficient μp of the second press roller 52 is desirably 0.3 or less.

  Further, as the material of the second press roller 52 and the cleaning roller 54, when oil-based ink is used, the oil repellency of the surface of the second press roller 52 is more than the oil repellency of the surface of the cleaning roller 54. It is desirable to select a material that can be high. When water-based ink is used, it is desirable to select a material that makes the surface of the second press roller 52 more water-repellent than the surface of the cleaning roller 54.

  Moreover, as a material of the plate-like member 55, for example, it is desirable to use stainless steel. In the present embodiment, a plate-like member is used as a member for scraping off deposits on the cleaning roller 54. However, the present invention is not limited to this. For example, a brush member may be used.

  The paper supply unit 20 includes a paper supply base 21 on which the print paper P1 is placed, and a primary paper supply roller 22 that takes out the print paper P1 one by one from the paper supply base 21 and sends it to the secondary paper supply roller 23. The leading end of the printing paper P1 that is disposed downstream of the primary paper feeding roller 22 in the carrying direction is temporarily stopped, and the printing paper P1 is transferred to the first printing drum at a predetermined timing. A secondary paper feed roller 23 is provided between 41 and the first press roller 42.

  The paper discharge unit 70 is a paper discharge feeding belt unit 72 that conveys the double-sided printed printing paper P3 to the paper discharge table 71, and a paper discharge on which the double-sided printed printing paper P3 conveyed by the paper discharge feeding belt unit 72 is stacked. A stand 71 is provided.

  Further, a curved conveyance unit 44 is installed between the first printing unit 40 and the intermediate stock unit 46. As shown in FIG. 1, the curved conveyance unit 44 includes a guide plate having a curved surface along the conveyance path. On the curved surface of the guide plate, a conveyor belt provided with a suction port for sucking the printing paper P1 sent out from the first printing unit 40 is installed. A pulley 45 that circulates and moves the transport belt is provided. The curved conveyance unit 44 sucks the single-side printed paper P2 by the suction port of the conveyance belt, and conveys the single-side printed paper P2 by the conveyance belt along the curved surface of the guide plate by rotating the pulley 45. Is.

  Further, between the intermediate stock unit 46 and the second printing unit 50, a pickup roller 47 that picks up the single-side printed printing paper P <b> 2 carried out from the intermediate stock unit 46, and single-sided printing picked up by the pickup roller 47. There is provided a timing roller 48 that sequentially feeds the finished printing paper P2 between the second printing drum 51 and the second press roller 52 at a predetermined timing.

  Next, the operation of the stencil printing apparatus 1 of the present embodiment will be described.

  First, a document is placed on a document table of the image reading unit 10 and scanned by a line image sensor while being pressed by a pressing plate, and image data is read. Then, image data representing the image recorded on the original is sequentially acquired for each line.

  Then, after predetermined processing is performed on the image data acquired for each line, the processed image data is sequentially output to the first plate making unit 30, and the first image data is processed based on the processed image data for each line. The stencil sheet M is perforated using the thermal head 31 of the plate making unit 30 and the plate making process for each line is sequentially performed.

  The processed image data corresponding to one image is input to the first plate making unit 30 as described above and subjected to the plate making process, and the processed image data corresponding to the other image is the second plate making. The plate making process is performed in the same manner as described above.

  The plate subjected to the plate making process in the first plate making unit 30 is wound around the first printing drum 41, and the plate subjected to the plate making process in the second plate making unit 35 is used as the second printing drum. The print operation is executed.

  Specifically, ink is supplied to the inside of the first and second printing drums 41 and 51 by an ink supply pump (not shown), and the first and second printing drums 41 and 51 are rotationally driven. Then, the printing paper P1 is fed out from the paper feed tray 21 by the primary paper feed roller 22 at a predetermined timing in synchronization with the rotation of the first and second print drums 41 and 51, and once the secondary paper feed roller 23 is reached. 1 is formed by the secondary paper feed roller 23 from the left to the right in FIG. 1 at a predetermined timing, and is supplied between the first printing drum 41 and the first press roller 42. The Then, the printing paper P1 is pressed against the printing paper P1 by the first press roller 42 against the stencil stencil sheet M wound around the outer peripheral surface of the first printing drum 41. Is done.

  Then, when the first printing drum 41 is rotated by a predetermined angle and the stencil printing on one side of the printing paper P1 is completed, the printing paper P2 on which the one-side printing has been completed is transferred to the first printing drum by the first peeling claw 43. The single-sided printed printing paper P <b> 2 that has been peeled off from 41 is transported to the intermediate stock section 46 by the curved transport section 44.

  The single-side printed paper P2 is once stocked in the intermediate stock section 46, and then discharged from the intermediate stock section 46 with the printing surface facing downward (the unprinted surface is the upper side), and is picked up by a pickup roller 47. And is once abutted against the timing roller 48 to form a slack and then supplied between the second printing drum 51 and the second press roller 52 by the timing roller 48 at a predetermined timing.

  Then, the non-printed surface of the single-sided printed paper P2 is pressed against the stencil stencil sheet M wound around the outer peripheral surface of the second printing drum 51 by the second press roller 52, so that the single-sided printing is completed. Stencil printing is performed on the unprinted surface of the printing paper P2.

  When the second printing drum 51 rotates by a predetermined angle and the stencil printing on the unprinted surface of the single-sided printed printing paper P2 is completed, the double-sided printed printing paper P3 is removed by the peeling claw 53 by the second claw 53. The double-sided printed printing paper P3 that has been peeled off from the printing drum 51 is transported to the paper discharge tray 71 by the paper discharge feed belt 72 and stacked on the paper discharge tray 71.

  Then, the printing paper P1 is again fed out from the paper feed tray 21, and double-sided stencil printing is performed on the printing paper P1 in the same manner as described above.

  Here, when double-sided printing is repeated as described above, in the stencil printing apparatus 1 of the present embodiment, as shown in FIG. 4, the second press roller 52 and the printing surface of the single-side printed printing paper P2 are separated. Because of the contact, the ink on the printing surface of the single-sided printed printing paper P2 is transferred onto the second press roller 52, and the transferred ink is transferred to the printing surface of the single-sided printed printing paper P2 to be printed thereafter. Retransfer will result in degradation of print quality.

  Therefore, in order to prevent retransfer as described above, the cleaning roller 54 is brought into pressure contact with the second press roller 52, and the ink on the second press roller 52 is transferred onto the cleaning roller 54.

  However, since not only ink but also paper dust adheres to the second press roller 52, the mixture of these deposits on the cleaning roller 54, and retransfer stains increase. End up.

  Therefore, in the stencil printing apparatus 1 of the present embodiment, the plate-like member 55 scrapes off deposits deposited on the surface of the cleaning roller 54 by bringing one end of the plate-like member 55 into contact with the cleaning roller 54.

  As shown in FIG. 1, a dog-shaped receiving tray 59 is installed directly below the plate-like member 55, and the deposit scraped off by the plate-like member 55 is inclined to the receiving tray 59. It is configured such that it falls on the surface and gathers in the central part of the receiving tray 59. The receiving tray 59 can be taken out from the stencil printing apparatus 1, and the deposit on the receiving tray 59 is discarded outside the apparatus by the operator.

  In the stencil printing apparatus 1 of the above embodiment, the cleaning roller 54 and the plate-like member 55 are provided for the second press roller 52. However, the pickup roller 47 and the timing roller 48 also have the second configuration. Similarly to the press roller 52, the single-sided printed printing paper P2 is nipped and brought into contact with the printing surface, so that it is considered that deposits including ink accumulate. Therefore, not only the second press roller 52 but also the conveying rollers such as the pickup roller 47 and the timing roller 48 provided on the downstream side of the intermediate stock portion 46 are cleaned similarly to the second press roller 52. A roller and a plate-like member may be provided.

  Further, in the stencil printing apparatus 1 of the above embodiment, both the cleaning roller 54 and the plate-like member 55 are provided for the second press roller 52. It may be configured such that one end of the plate-like member 55 is in direct contact with the second press roller 52, the pickup roller 47 or the timing roller 48. In this case, however, the surface of the second press roller 52, the pickup roller 47, or the timing roller 48 is made of a strong rubber such as NBR rubber so that the surface of the second press roller 52, the pick-up roller 47, or the timing roller 48 can be damaged to some extent. It is desirable to form with a member.

  In addition, the cleaning roller 54 may function as an auxiliary roller in order to suppress bending that occurs when the second press roller 52 is detached from the second printing drum 51. Specifically, a cleaning roller having a rigidity higher than that of the second press roller 52 is used. For example, when a fluorine-based tube is used as the second press roller 52, it is desirable to use a roller having a rubber hardness of about 70 degrees and a rubber thickness of about 4 mm as the cleaning roller 54.

  The rigidity of the second press roller 52 and the cleaning roller 54 is measured by pressing a hardness meter against each surface.

  The ratio of the rigidity of the second press roller 52 and the rigidity of the cleaning roller 54 is preferably about 1: 3.5.

  In addition, it is desirable that the rotation axis center of the second printing drum 51, the rotation axis center of the second press roller 52, and the rotation axis center of the cleaning roller 54 be arranged on a vertical line.

  In the above embodiment, the case where the cleaning roller 54 that functions as an auxiliary roller is provided for the second press roller 52 has been described. However, the present invention is not limited thereto, and the auxiliary roller is also provided for the first press roller 42. May be provided. That is, an auxiliary roller having higher rigidity than the first press roller may be provided for the first press roller 42.

  In the above embodiment, the cleaning roller 54 functions as an auxiliary roller. However, a roller member that does not have a cleaning function and functions only as an auxiliary roller is provided for the second press roller 52. Also good.

  Further, the stencil printing apparatus of the above-described embodiment accepts image data output from the image reading unit 10, but is not limited thereto, and may accept image data edited and generated by a computer such as a personal computer. Good.

  In addition, the stencil printing apparatus of the above embodiment includes two printing drums that perform double-sided printing. However, the present invention is not limited to this, and the printing apparatus of the present invention is a stencil printing apparatus that includes one printing drum. Thus, the present invention can also be applied to a stencil printing apparatus capable of duplex printing by passing printing paper through a printing unit twice.

  Moreover, although the said embodiment applies the printing apparatus of this invention to a stencil printing apparatus, it is not restricted to this, It contacts with the printing surface of the single-sided printed paper which printed on one side of the printing paper. Other printing apparatuses may be used as long as the printing apparatus includes a roller member. For example, the present invention is also applicable to an inkjet printer including a nip roller that contacts one side of the printed paper after printing on one side with an inkjet head. Is possible.

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 10 Image reading part 20 Paper feed part 30 1st plate making part 35 2nd plate making part 40 1st printing part 41 1st printing drum 42 1st press roller 46 Intermediate stock part 47 Pickup roller 48 Timing roller 50 Second printing section 51 Second printing drum 52 Second press roller 54 Cleaning roller 55 Plate member 56 Mounting member 56a Spring member 57 Cleaning roller installation member 57b Spring member 58 Blade installation member 59 Receptacle

Claims (8)

In a printing apparatus that performs double-sided printing on a printing paper, the printing apparatus includes a roller member that contacts a printing surface of a single-side printed paper that has been printed on one side of the printing paper.
A cleaning roller member that is in contact with the roller member and to which deposits attached to the roller member are transferred;
A printing apparatus comprising: a scraping member for scraping off deposits transferred to the cleaning roller member. A printing drum that performs printing on the other unprinted side of the one-side printed paper;
The printing apparatus according to claim 1, wherein the roller member is a press roller pressed against the printing drum.   The printing apparatus according to claim 1, wherein a friction coefficient of the surface of the cleaning roller member is larger than a friction coefficient of the surface of the roller member.   4. The printing apparatus according to claim 1, wherein a water repellency or oil repellency of the surface of the roller member is higher than a water repellency or oil repellency of the cleaning roller member. 5.   The printing apparatus according to claim 1, wherein the scraping member is a plate-like member. A printing apparatus for performing double-sided printing on a printing paper, comprising a roller member that contacts a printing surface of a single-side printed paper after printing on one side of the printing paper,
A printing apparatus, comprising: a scraping member for scraping off deposits adhering to the roller member.   The printing apparatus according to claim 2, wherein the cleaning roller member has higher rigidity than the press roller.   The printing apparatus according to claim 7, wherein the rotation axis center of the printing drum, the rotation axis center of the press roller, and the rotation axis center of the cleaning roller member are arranged on a vertical line.

Images