JP2013167715A - Image forming apparatus and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus and an image forming system capable of suppressing the deterioration of a continuous sheet when conveyance of a continuous sheet is stopped.SOLUTION: When conveyance of a continuous sheet P is stopped, a control part stops a first conveying device after a fixed time period has lapsed from a stop command of the control part to a second conveying device. Thus, the length of a continuous sheet P between an upstream side holding roll 62 and a downstream side holding roll 78 becomes longer, and the continuous sheet P is separated from a preheating device 28 by causing, for example, a slackness of 80 to 400 [mm] to the continuous sheet P. The continuous sheet P is separated from the preheating device 28, a heating roll 46 and a pressure roll 48, thereby enabling suppressing the deterioration of the continuous sheet P due to the remaining heat of the preheating device 28.

Description

  The present invention relates to an image forming apparatus and an image forming system.

  The fixing device described in Patent Document 1 pre-heats the recording material while adhering the recording material by the suction force of the suction device and a suction device that sucks the back surface of the long continuous recording material holding the toner image. And a pair of fixing rolls composed of a heating roll and a pressure roll that are in pressure contact with each other, and a recording material lifting device having a protruding member that can be displaced relative to the preheater surface.

JP 10-123864 A

  An object of the present invention is to suppress deterioration of continuous paper when conveyance of the continuous paper is stopped.

  According to a first aspect of the present invention, there is provided an image forming apparatus including a conveyance path through which continuous paper is conveyed, an image forming unit that is provided in the middle of the conveyance path and forms a toner image on the conveyed continuous paper, and The toner image formed on the continuous paper is heated in contact with the back surface of the continuous paper which is provided on the downstream side of the image forming unit in the conveying direction of the continuous paper and has the toner image formed on the front surface. A first conveying device that is provided upstream of the heating member in the conveying direction of the continuous paper with respect to the heating member, and applies a conveying force to convey the continuous paper toward the heating member; Provided downstream of the heating member in the transport direction of the continuous paper, and imparts a transport force for transporting the continuous paper from the heating member toward the downstream side of the transport direction of the continuous paper. The second conveying device and the heating member An upstream holding member that is disposed next to the heating member in the conveyance path on the upstream side in the conveyance direction of the continuous paper, and that can hold the continuous paper, and the conveyance direction of the continuous paper with respect to the heating member A downstream holding member that is disposed next to the heating member in the conveyance path on the downstream side of the sheet and can hold the continuous paper, and when the conveyance of the continuous paper is stopped, the upstream holding member and the downstream A side holding member for controlling the continuous paper, and the first holding device and the second conveying device for controlling the conveying force applied to the continuous paper, thereby controlling the upstream holding member and the downstream side. A control unit that increases a line length of the continuous paper between the continuous holding member and the side holding member as compared with a case where a toner image is formed on the continuous paper, and separates the back surface of the continuous paper from the heating member; It is characterized by providing.

  The image forming apparatus according to a second aspect of the present invention is the image forming apparatus according to the first aspect, wherein when the conveyance of the continuous sheet is stopped, the control unit stops the second conveying apparatus after stopping the second conveying apparatus. One transport device is stopped.

  According to a third aspect of the present invention, in the image forming apparatus according to the first aspect, in the case where the conveyance of the continuous paper is stopped, the control unit is configured to convey the continuous paper by the second conveyance device. The first conveying device and the second conveying device are stopped after the toner image is made slower than the conveying speed when the toner image is formed on the continuous paper.

  The image forming apparatus according to a fourth aspect of the present invention is the image forming apparatus according to the first aspect, wherein when the conveyance of the continuous paper is stopped, the control unit is configured to convey the continuous paper by the first conveyance device. The first conveying device and the second conveying device are stopped after increasing the speed of the toner image compared to the conveying speed when the toner image is formed on the continuous paper.

  The image forming apparatus according to a fifth aspect of the present invention is the image forming apparatus according to the first aspect, wherein when the conveyance of the continuous paper is stopped, the control unit includes the first conveyance device and the second conveyance device. The conveyance of the continuous paper is once stopped, and then the second conveyance device is conveyed by the second conveyance device in a direction opposite to the conveyance direction of the continuous paper, and then the second conveyance device is stopped. .

  The image forming apparatus according to a fifth aspect of the present invention is the image forming apparatus according to any one of the first to fifth aspects, wherein the heating member is vertically above the upstream holding member and the downstream holding member, The upstream side holding member and the downstream side holding member are provided on the lower side in the vertical direction with respect to the back surface of the continuous paper. It is a rotating body pair provided with a rotating body.

  According to a seventh aspect of the present invention, there is provided an image forming system comprising: the first image forming apparatus according to the first aspect; and a front and back side of a continuous sheet on which an image is formed on one side by the first image forming apparatus. A reversing device for reversing, a second image forming device according to any one of claims 1 to 5 for forming an image on the other surface of the continuous paper reversed by the reversing device, and the first The continuous paper that is provided between the image forming apparatus and the second image forming apparatus and is transported by the second transport device of the first image forming apparatus when the transport of the continuous paper is stopped. And an absorption device that absorbs the difference between the transport amount of the continuous paper transported by the first transport device of the second image forming apparatus.

  According to the image forming apparatus of the first aspect of the present invention, even after the conveyance of the continuous paper is stopped, the conveyance of the continuous paper is stopped as compared with the case where the heating member is in contact with the continuous paper. In this case, deterioration of the continuous paper can be suppressed.

  According to the image forming apparatus of the second aspect of the present invention, when the conveyance of the continuous paper is stopped, the heating member is continuously moved as compared with the configuration in which the heating member is moved to separate the heating member from the continuous paper. Paper can be separated with a simple configuration.

  According to the image forming apparatus of the third aspect of the present invention, when the conveyance of the continuous paper is stopped, the heating member is continuously moved as compared with the configuration in which the heating member is moved to separate the heating member from the continuous paper. Paper can be separated with a simple configuration.

  According to the image forming apparatus of the fourth aspect of the present invention, when the conveyance of the continuous paper is stopped, the heating member is continuously moved as compared with the configuration in which the heating member is moved to separate the heating member from the continuous paper. Paper can be separated with a simple configuration.

  According to the image forming apparatus of the fifth aspect of the present invention, when the conveyance of the continuous paper is stopped, the heating member is continuously moved as compared with the configuration in which the heating member is moved to separate the heating member from the continuous paper. Paper can be separated with a simple configuration.

  According to the image forming apparatus of the sixth aspect of the present invention, the continuous paper separated from the heating member is heated in the lower vertical direction as compared with the case where a rotating body whose diameter changes unevenly along the rotation axis is not used. It can suppress drooping toward a member.

  According to the image forming system of claim 7 of the present invention, as compared with a case where an absorbing device that absorbs a difference in conveyance amount is not provided between the first image forming apparatus and the second image forming apparatus. Thus, the continuous paper can be prevented from being damaged.

(A) (B) It is the side view which showed the pre-heating apparatus etc. which were used for the image forming apparatus which concerns on 1st Embodiment of this invention. FIG. 5 is a flowchart illustrating a control process of a control unit used in the image forming apparatus according to the first embodiment of the present invention. (A) (B) It is the side view which showed the upstream holding roll used for the image forming apparatus which concerns on 1st Embodiment of this invention. (A) (B) It is the side view which showed the downstream holding roll used for the image forming apparatus which concerns on 1st Embodiment of this invention. It is the perspective view which showed the pre-heating apparatus, the upstream holding roll, and the downstream holding roll which were used for the image forming apparatus which concerns on 1st Embodiment of this invention. FIG. 2 is a front view showing an upstream holding roll and a downstream holding roll used in the image forming apparatus according to the first embodiment of the present invention. 1A and 1B are side views showing a fixing device used in an image forming apparatus according to a first embodiment of the present invention. 1A and 1B are side views showing a fixing device used in an image forming apparatus according to a first embodiment of the present invention. FIG. 3 is a block diagram illustrating a control form of a control unit used in the image forming apparatus according to the first embodiment of the present invention. 1 is a side view showing an image forming unit used in an image forming apparatus according to a first embodiment of the present invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. FIG. 10 is a flowchart illustrating a control process of a control unit used in an image forming apparatus according to a second embodiment of the present invention. It is the flowchart which showed the control process of the control part used for the image forming apparatus which concerns on 3rd Embodiment of this invention. It is the flowchart which showed the control process of the control part used for the image forming apparatus which concerns on 4th Embodiment of this invention. It is the block diagram which showed the control form of the control part used for the image forming system which concerns on 5th Embodiment of this invention. It is the perspective view which showed the inversion apparatus used for the image forming system which concerns on 5th Embodiment of this invention. FIG. 10 is a schematic configuration diagram illustrating a first image forming apparatus and a second image forming apparatus used in an image forming system according to a fifth embodiment of the present invention.

  An example of the image forming apparatus according to the first embodiment of the present invention will be described with reference to FIGS. In addition, arrow UP shown in a figure shows the vertical direction upper direction.

(overall structure)
As shown in FIG. 11, the image forming apparatus 10 according to the first embodiment includes a feed mandrel 12 around which a continuous paper P such as a roll paper on which image formation is performed, and a continuous paper P on which an image is formed. A winding mandrel 14 that rotates and winds up. No driving force is transmitted to the delivery mandrel 12, and the delivery mandrel 12 is rotatably supported by a frame member (not shown). Further, a powder brake (not shown) is coupled to the delivery mandrel 12 via a gear so that a predetermined tension is applied to the continuous paper P when the continuous paper P is conveyed.

  Further, a conveyance path 16 for conveying the continuous paper P is formed between the feeding mandrel 12 and the winding mandrel 14. Further, a plurality of transport rolls 18 for transporting the continuous paper P and a stretching roll 20 for defining the transport path 16 of the transported continuous paper P are provided on the transport path 16.

  A loop amount determination roll 24 used for determining the loop amount (deflection amount) of the continuous paper P is disposed in the vicinity of the winding mandrel 14 on the conveyance path 16. In the drawing, the continuous paper P and the transport path 16 are described so as to overlap each other.

  Further, an image forming unit 26 as an example of an image forming unit that forms a toner image on the continuous paper P is provided on the transport path 16. Further, a toner image formed on the continuous paper P by the image forming unit 26 on the downstream side in the transport direction of the continuous paper P (hereinafter simply referred to as “downstream side in the transport direction”) with respect to the image forming unit 26. A pre-heating device 28 is provided as an example of a heating member that heats the toner image via the continuous paper P in advance before fixing on the continuous paper P. Further, on the downstream side in the transport direction of the preheating device 28, two fixing devices 30 for fixing the toner image on the continuous paper P heated by the preheating device 28, and wind on the continuous paper P on which the toner image is fixed. A cooling fan 32 that blows and cools the continuous paper P is provided in this order.

  Here, the first transport device 56 that imparts the transport force for transporting the continuous paper P toward the preheating device 28 to the continuous paper P includes a transport roll 18A disposed on the upstream side in the transport direction, and an image carrier to be described later. 34.

  On the other hand, a second transport device 58 that imparts a transport force for transporting the continuous paper P from the preheating device 28 toward the downstream side in the transport direction is applied to the continuous paper P, a transport roll 18B disposed on the downstream side in the transport direction, and a later-described transport roller 18B. The heating roll 46 to be configured.

  Further, a control unit 44 that controls the operation of each unit of the image forming apparatus 10 is provided, and the control unit 44 controls the first conveyance device 56 and the second conveyance device 58 to convey the continuous paper P. The timing for stopping the printing, the conveyance speed of the continuous paper P, and the like are changed.

  The details of the control of the first transport device 56 and the second transport device 58 by the control unit 44 and the preheating device 28 will be described later.

[Image forming unit]
As shown in FIG. 10, the image forming unit 26 is in contact with the surface of the image holding body 34 that rotates when the rotational force is transmitted, and charges the surface of the image holding body 34. A charging roll 36, an exposure device 38 that exposes the surface of the charged image carrier 34 to form an electrostatic latent image, and development that develops the electrostatic latent image formed on the surface of the image carrier 34 as a toner image. The apparatus 40 includes a cleaning device 43 that removes unnecessary toner remaining on the image carrier 34.

  Further, the developing device 40 includes a cylindrical developing roller 40A that conveys toner to a developing area facing the image carrier 34 and develops the electrostatic latent image formed on the surface of the image carrier 34 with toner. ing.

  Further, a transfer roll 42 for transferring the toner image formed on the surface of the image holding body 34 to the continuous paper P is provided on the opposite side of the continuous paper P with respect to the image holding body 34.

  In this embodiment, a toner, that is, a one-component developer is used, but a two-component developer composed of a carrier and a toner may be used.

[Fixer]
As shown in FIG. 11, two fixing devices 30 are arranged along the conveyance path 16. These fixing devices 30 include a heating roll 46 accommodated in the housing 30 </ b> A and a pressure roll 48 that presses the continuous paper P against the heating roll 46. A heater 47 is provided inside the heating roll 46 and the pressure roll 48.

  The heating roll 46 is applied with a rotational force from a drive source (not shown), and the pressure roll 48 is transmitted with the rotational force of the heating roll 46 via the continuous paper P, and the heating roll 46 The rotation follows the rotation. Further, as shown in FIGS. 7A and 7B, the pressure roll 48 has a pressing position (see FIG. 7A) for pressing the continuous paper P toward the heating roll 46, and is separated from the heating roll 46. It is possible to move between the separated positions (see FIG. 7B).

  As shown in FIGS. 8A and 8B, both end sides of the shaft member 48A of the pressure roll 48 are rotatably supported on the center side of the elongated swinging member 50, and the swinging member 50 is The shaft 50 </ b> A provided on one end side (adjacent fixing device 30 side) of the swing member 50 is swingable.

  On the other hand, a cam member 52 whose outer peripheral surface is in contact with the swing member 50 is provided on the other end side of the swing member 50, and further, the swing member 50 is biased toward the outer peripheral surface of the cam member 52. One end of the spring member 54 is fixed to the other end side of the swing member 50. Further, a stepping motor 60 that applies a rotational force to the rotation shaft of the cam member 52 is provided.

  With this configuration, when the control unit 44 controls the rotation angle of the stepping motor 60, the pressing roll 48 moves, and the pressing roll 48 presses the continuous paper P toward the heating roll 46 (FIG. 7). (A) and FIG. 8 (A)) and a separation position where the pressure roll 48 and the heating roll 46 are separated (see FIG. 7 (B) and FIG. 8 (B)). .

  7B, the continuous paper P that has been transported along the curved transport path 16 is transported along the curved transport path 16 at a separation position where the pressure roll 48 and the heating roll 46 are separated from each other. Away from the heating roll 46 and the pressure roll 48.

(Main components)
[Preheating device]
As shown in FIGS. 1 and 11, the preheating device 28 includes a roll 28 </ b> A that is in contact with the back surface of the continuous paper P (the surface on which an unfixed image is not formed). The roll 28A is rotatably supported by a frame member (not shown). Further, a heater 28B is provided inside the roll 28A.

  With this configuration, as the continuous paper P is conveyed, the roll 28A that is in contact with the back surface of the continuous paper P is driven to rotate, so that the toner image formed on the continuous paper P is heated. .

  Further, an upstream holding roll 62 as an example of an upstream holding member capable of holding the continuous paper P to be transported is adjacent to the preheating device 28 in the transport path 16 on the upstream side in the transport direction with respect to the preheating device 28. Is provided.

  Further, a downstream holding roll 78 as an example of a downstream holding member capable of holding the continuous paper P to be transported is adjacent to the preheating device 28 in the transport path 16 on the downstream side in the transport direction with respect to the preheating device 28. Is provided.

[Upstream holding roll]
As shown in FIGS. 1 and 6, the upstream holding roll 62 is a so-called corrugation roll that corrugates the continuous paper P in the width direction to increase the rigidity of the continuous paper P against bending in the transport direction. A back-side roll 64 that contacts the back side of P and a front-side roll 66 that contacts the surface of the continuous paper P are provided.

  The back surface side roll 64 is adapted to receive a rotational force from a drive source (not shown). As shown in FIG. 6, a rubber roll 64B formed of a cylindrical rubber material is attached to the shaft member 64A of the back-side roll 64, and a predetermined interval is provided on the outer peripheral surface of the rubber roll 64B in the direction of the rotation axis. A plurality of disc-shaped protrusions 64C are integrally formed with a gap therebetween.

  On the other hand, the shaft member 66A of the front surface side roll 66 is provided with a plurality of disk-shaped protrusions 66B so as to be different from the protrusions 64C of the back surface side roll 64.

  In other words, the upstream holding roll 62 constituted by the back-side roll 64 and the front-side roll 66 includes a rotating body whose diameter changes unevenly along the rotation axis extending in the width direction of the continuous paper P. It can be said that it is a pair.

  Further, as shown in FIGS. 1A and 1B, the front-side roll 66 is separated from the back-side roll 64 (see FIG. 1A) and continuous paper toward the back-side roll 64. It is supported so as to be movable between a pressing position where P is pressed (see FIG. 1B).

  As shown in FIGS. 3A and 3B, both end sides of the shaft member 66A of the surface-side roll 66 are rotatably supported on the center side of the long rocking member 70 via a bearing 65, The swing member 70 is swingable about a shaft 70A provided on one end side (the upper side in the drawing) of the swing member 70.

  On the other hand, a cam member 72 whose outer peripheral surface is in contact with the swing member 70 is provided on the other end side of the swing member 70, and further, the swing member 70 is urged toward the outer peripheral surface of the cam member 72. One end of the spring member 74 is fixed to the other end side of the swing member 70. Further, a stepping motor 76 that applies a rotational force to the rotation shaft of the cam member 72 is provided.

  With this configuration, when the control unit 44 controls the rotation angle of the stepping motor 76, the front-side roll 66 moves and the front-side roll 66 presses the continuous paper P against the back-side roll 64 (FIG. 1 ( B) and FIG. 3B) and a separation position (see FIG. 1A and FIG. 3A) where the front-side roll 66 and the back-side roll 64 are separated from each other. .

[Downstream holding roll]
As shown in FIGS. 1 and 6, the downstream holding roll 78 has the same configuration as the upstream holding roll 62, and the continuous paper P is waved in the width direction so that the continuous paper P in the transport direction is It is a so-called corrugation roll that increases rigidity. The downstream holding roll 78 includes a back side roll 80 that contacts the back side of the continuous paper P and a front side roll 82 that contacts the surface of the continuous paper P.

  The back roll 80 is applied with a rotational force from a drive source (not shown). As shown in FIG. 6, the shaft member 80 </ b> A of the back-side roll 80 is provided with a columnar rubber roll 80 </ b> B and a disk-shaped protrusion 80 </ b> C, similarly to the upstream holding roll 62.

  On the other hand, the shaft member 82A of the front-side roll 82 is provided with a plurality of disc-shaped protrusions 82B so as to be different from the protrusions 80C of the back-side roll 80.

  In other words, the downstream holding roll 78 constituted by the back-side roll 80 and the front-side roll 82 includes a rotating body whose diameter changes to be uneven along the rotation axis extending in the width direction of the continuous paper P. It can be said that it is a pair.

  Further, as shown in FIGS. 1A and 1B, like the upstream holding roll 62, the front side roll 82 is separated from the back side roll 80 (see FIG. 1A), It is supported so as to be movable between a pressing position where the continuous paper P is pressed against the back-side roll 64 (see FIG. 1B).

  As shown in FIGS. 4A and 4B, both end sides of the shaft member 82A of the surface-side roll 82 are rotatably supported on the center side of the elongated swinging member 84 via a bearing 65, The swing member 84 is swingable about a shaft 84A provided on one end side (the upper side in the figure) of the swing member 84.

  On the other hand, a cam member 86 whose outer peripheral surface is in contact with the swing member 84 is provided on the other end side of the swing member 84, and further, the swing member 84 is biased toward the outer peripheral surface of the cam member 86. One end of the spring member 88 is fixed to the other end side of the swing member 84. Further, a stepping motor 90 is provided that applies a rotational force to the rotation shaft of the cam member 86.

  With this configuration, the control unit 44 controls the rotation angle of the stepping motor 90 so that the front-side roll 82 moves and the front-side roll 82 presses the continuous paper P against the back-side roll 80 (FIG. 1 ( B) and FIG. 4B) and a separation position (see FIG. 1A and FIG. 4A) in which the front-side roll 82 and the back-side roll 80 are separated from each other. .

(Control part)
Next, the control of the control unit 44 when the image forming operation is finished and the conveyance of the continuous paper P is stopped will be described.

  When stopping the transport of the continuous paper P, the control unit 44 stops the upstream holding roll 62 and the first transport device 56 after stopping the downstream holding roll 78 and the second transport device 58. Further, the control unit 44 switches the front-side rolls 66 and 82 and the rear-side rolls 64 and 80 that are arranged at the separated positions to the pressing position during image formation. Thereby, the line length of the continuous paper P between the upstream side holding roll 62 and the downstream side holding roll 78 is made longer than the line length at the time of image formation, and the continuous paper P is separated from the preheating device 28. It is supposed to let you.

  The details of the control of the control unit 44 will be described together with the operation described later.

(Function)
Next, the operation of the main configuration will be described.

[During image formation]
As shown in FIG. 8, when forming an image on the continuous paper P, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. As a result, the fixing device 30 is switched to a pressing position where the pressure roll 48 presses the continuous paper P against the heating roll 46 (see FIGS. 7A and 8A).

  Further, as shown in FIG. 3A and FIG. 4A, the control unit 44 controls the rotation angle of the stepping motors 76 and 90 to rotate the cam members 52 and 86, 82 is moved. Thereby, the control part 44 switches the upstream side holding roll 62 and the downstream side holding roll 78 to the separation position where the surface side rolls 66 and 82 and the back surface side rolls 64 and 80 are separated (see FIG. 1A). .

  Further, as shown in FIG. 9 in which the flow of control by the control unit 44 is described, the control unit 44 controls the first transport device 56 and the second transport device 58 toward the preheating device 28. The conveyance speed for conveying the continuous paper P and the conveyance speed for conveying the continuous paper P from the preheating device 28 toward the downstream side in the conveyance direction are set to the same speed.

  When the control unit 44 controls each member as described above, as shown in FIG. 1A, the back surface of the continuous paper P on which the toner image is formed on the front surface by the image forming unit 26 (see FIG. 11). Contacts the preheating device 28, and the preheating device 28 heats the toner image formed on the continuous paper P from the back surface of the continuous paper P.

  As shown in FIG. 11, the continuous paper P on which the toner image has been heated by the preheating device 28 is transported downstream in the transport direction, and the toner image is further heated and pressurized by the fixing device 30. Fixed to P.

  Further, the continuous paper P on which the toner image is fixed is cooled by the cooling fan 32 and taken up on the take-up mandrel 14. The rotation speed of the winding mandrel 14 is controlled by the control unit 44 according to the determination result of the loop amount determination roll 24.

  In the image formation, the contact time between the preheating device 28 and the continuous paper P needs to be 0.4 [s] or more in order to sufficiently heat the paper having a thickness of 250 [μm].

  In the first embodiment, the conveyance speed of the continuous paper P during image formation is 100 [m / min], the outer diameter of the roll 28A of the preheating device 28 is φ600 [mm], and the continuous paper P is about 0.5 [m]. s], the preheating device 28 is used for heating. The thickness of the roll 28A was 5 mm, and the material of the roll 28A was an aluminum alloy (A5052).

  Further, a temperature detecting means (not shown) is provided on the surface of the roll 28A, and the temperature is controlled by the 40 [KW] heater 28B provided inside the roll 28A so that the roll 28A is maintained at a predetermined temperature. ing.

[When image forming operation is stopped]
Next, when the image forming operation is finished and the conveyance of the continuous paper P is stopped will be described with reference to the flowchart of FIG.

  When stopping the conveyance of the continuous paper P, first, in step 100, the control unit 44 controls the rotation angle of the stepping motors 76 and 90 to rotate the cam members 52 and 86, and the front side rolls 66 and 82. Move. Thereby, the control part 44 switches the upstream holding roll 62 and the downstream holding roll 78 to the pressing position where the front side rolls 66 and 82 press the continuous paper P against the back side rolls 64 and 80 (FIG. 3B). FIG. 4B). When the upstream holding roll 62 and the downstream holding roll 78 are switched to the pressing position, the process proceeds to step 200.

  In step 200, the control unit 44 stops the conveyance of the continuous paper P by the downstream holding roll 78, the second conveyance device 58 and the take-up mandrel 14. That is, the conveyance of the continuous paper P on the downstream side in the conveyance direction with respect to the preheating device 28 is stopped (see FIG. 9). The downstream holding roll 78, the second transport device 58 and the take-up mandrel 14 are stopped and the process proceeds to Step 300.

  In step 300, after a predetermined time has elapsed from the stop command of the control unit 44 (for example, after 0.1 to 0.5 [s]), the control unit 44 performs continuous paper using the upstream holding roll 62 and the first transport device 56. Stop transporting P. That is, the conveyance of the continuous paper P on the upstream side in the conveyance direction with respect to the preheating device 28 is stopped.

  Thereby, as shown in FIG. 1B and FIG. 5, the line length of the continuous paper P between the upstream holding roll 62 and the downstream holding roll 78 becomes long. The continuous paper P is separated from the preheating device 28 by generating a slack of 400 mm.

  Here, since the upstream holding roll 62 and the downstream holding roll 78 are so-called corrugation rolls, the continuous paper P undulates in the width direction of the continuous paper P, and the rigidity in the transport direction of the continuous paper P is high (continuous). Paper P has a waist). For this reason, since the continuous paper P is lifted with respect to the preheating device 28, the continuous paper P is reliably separated from the preheating device 28 (see FIG. 5). When the continuous paper P is separated from the preheating device 28, the process proceeds to step 400.

  As shown in FIG. 2, in step 400, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. Thereby, the control unit 44 switches the fixing device 30 to a separation position where the pressure roll 48 and the heating roll 46 are separated (see FIGS. 7 and 8).

[When resuming image formation]
When forming an image on the continuous paper P again, first, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. As a result, the control unit 44 switches the fixing device 30 to a pressing position where the pressure roll 48 presses the continuous paper P against the heating roll 46 (see FIGS. 7A and 8A). As a result, the continuous paper P is sandwiched between the heating roll 46 and the pressure roll 48.

  Next, as shown in FIG. 9, the control unit 44 operates the downstream holding roll 78, the second transport device 58, and the take-up mandrel 14. That is, the conveyance force is supplied to the continuous paper P on the downstream side in the conveyance direction with respect to the preheating device 28. Thereby, the back surface of the continuous paper P is brought into contact with the preheating device 28. Next, the control unit 44 operates the upstream holding roll 62 and the first transport device 56.

  3A and 4A, the control unit 44 controls the rotation angle of the stepping motors 76 and 90 to rotate the cam members 52 and 86, and the surface side roll 66, 82 is moved. Thereby, the control part 44 switches the upstream holding roll 62 and the downstream holding roll 78 to the separation position where the surface side rolls 66 and 82 and the back surface side rolls 64 and 80 are separated.

  Thereafter, a toner image is formed on the surface of the continuous paper P by the image forming unit 26 (see FIG. 11).

  As described above, when the conveyance of the continuous paper P is stopped, the continuous paper P is separated from the preheating device 28, the heating roll 46, and the pressure roll 48 by the remaining heat of the preheating device 28. Is suppressed from deteriorating.

  Further, since the continuous paper P is separated from the preheating device 28 by changing the stop timing of the first conveyance device 56 and the second conveyance device 58, the continuous paper P is separated from the preheating device 28. The continuous paper P is separated from the pre-heating device 28 without providing a dedicated member for the purpose.

  In addition, by employing so-called corrugation rolls for the upstream holding roll 62 and the downstream holding roll 78, the rigidity of the continuous paper P is increased so that the continuous paper P is separated from the preheating device 28. For this reason, compared with the case where a so-called corrugation roll is not used, the continuous paper P is effectively separated from the preheating device 28. That is, the continuous paper P separated from the preheating device 28 is prevented from dripping toward the preheating device 28 on the lower side in the vertical direction.

  Further, by providing the preheating device 28 on the upstream side in the conveyance direction of the fixing device 30, the toner image is reliably fixed on the continuous paper P. Therefore, the conveyance speed of the continuous paper P is adjusted by the preheating device 28. Compared to the case where it is not provided, the speed can be increased.

Second Embodiment
Next, an example of an image forming apparatus according to the second embodiment of the present invention will be described with reference to FIG. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, unlike the first embodiment, when stopping the transport of the continuous paper P, the control unit 94 stops the first transport device 56 after stopping the second transport device 58. There is no control.

  As shown in FIG. 12, after finishing the toner image forming operation, in step 100, the control unit 94 controls the rotation angles of the stepping motors 76 and 90 to rotate the cam members 52 and 86, thereby The side rolls 66 and 82 are moved. Thereby, the control part 44 switches the upstream holding roll 62 and the downstream holding roll 78 to the pressing position where the front side rolls 66 and 82 press the continuous paper P against the back side rolls 64 and 80 (FIG. 3B). FIG. 4B). When the front side rolls 66 and 82 are switched to the pressing position where the continuous paper P is pressed against the back side rolls 64 and 80, the process proceeds to step 200.

  In step 200, the control unit 94 stops the conveyance of the continuous paper P by the first conveying device 56, the upstream holding roll 62, the downstream holding roll 78, the second conveying device 58, and the take-up mandrel 14 (see FIG. 9). ). In this way, all the conveying devices are stopped and the process proceeds to step 300.

  In step 300, the control unit 94 operates the downstream holding roll 78, the second transport device 58, and the take-up mandrel 14 in the direction opposite to the transport direction of the continuous paper P during image formation (see FIG. 9). At this time, for example, the transport speed of the continuous paper P in the reverse direction by the second transport device 58 is 10 [m / min], and the continuous paper P is transported in the reverse direction for 1 to 5 [s]. Thereby, the line length of the continuous paper P between the upstream side holding roll 62 and the downstream side holding roll 78 becomes long, and the continuous paper P generates a slack of, for example, 80 to 400 [mm]. P is separated from the preheating device 28. When the continuous paper P is separated from the preheating device 28, the process proceeds to step 400.

  In step 400, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. Thereby, the control unit 44 switches the fixing device 30 to a separation position where the pressure roll 48 and the heating roll 46 are separated (see FIGS. 7 and 8).

  As described above, the continuous paper P is preheated by operating the downstream holding roll 78, the second transport device 58, and the take-up mandrel 14 in the direction opposite to the transport direction of the continuous paper P during image formation. Separate from the device 28.

Moreover, in 2nd Embodiment, the driving force does not need to be provided to the back surface side roll 64 of the upstream holding roll 62, and the back surface side roll 64 is a driven roll that follows the conveyance of the continuous paper P. Also good. In that case, in step 200, the controller 94 does not need to control the upstream holding roll 62.
Other operations are the same as those in the first embodiment.

<Third Embodiment>
Next, an example of an image forming apparatus according to the third embodiment of the present invention will be described with reference to FIG. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment, unlike the first embodiment, when stopping the transport of the continuous paper P, the control unit 96 stops the second transport device 58 after stopping the first transport device 56. There is no control.

  Further, the transport speed of the continuous paper P by the second transport device 58 can be switched between 100 [m / min] and 50 [m / min].

  As shown in FIG. 13, after the toner image forming operation is finished, in step 100, the control unit 96 controls the rotation angles of the stepping motors 76 and 90 to rotate the cam members 52 and 86, thereby The side rolls 66 and 82 are moved. Thereby, the control part 44 switches the upstream holding roll 62 and the downstream holding roll 78 to the pressing position where the front side rolls 66 and 82 press the continuous paper P against the back side rolls 64 and 80 (FIG. 3B). FIG. 4B). When the front side rolls 66 and 82 are switched to the pressing position where the continuous paper P is pressed against the back side rolls 64 and 80, the process proceeds to step 200.

  In step 200, the control unit 96 switches the transport speed of the continuous paper P by the downstream holding roll 78, the second transport device 58, and the winding mandrel 14 from 100 [m / min] to 50 [m / min]. Transition to 300.

  In step 300, the control unit 96 changes the conveyance speed by the downstream holding roll 78, the second conveyance device 58, and the take-up mandrel 14 in step 200, and then 0.2 to 1 [s] elapses. The conveyance of the continuous paper P by the conveyance device 56, the upstream holding roll 62, the downstream holding roll 78, the second conveyance device 58, and the winding mandrel 14 is stopped (see FIG. 9). Thereby, the line length of the continuous paper P between the upstream side holding roll 62 and the downstream side holding roll 78 becomes long, and the continuous paper P generates a slack of, for example, 80 to 400 [mm]. P is separated from the preheating device 28. When the continuous paper P is separated from the preheating device 28, the process proceeds to step 400.

  In step 400, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. Thereby, the control unit 44 switches the fixing device 30 to a separation position where the pressure roll 48 and the heating roll 46 are separated (see FIGS. 7 and 8).

  As described above, the continuous paper P is separated from the preheating device 28 by reducing the transport speed of the continuous paper P by the downstream holding roll 78, the second transport device 58 and the take-up mandrel 14. Other operations are the same as those in the first embodiment.

<Fourth embodiment>
Next, an example of an image forming apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fourth embodiment, unlike the first embodiment, when stopping the transport of the continuous paper P, the control unit 98 stops the first transport device 56 and then stops the second transport device 58. There is no control.

  Further, the transport speed of the continuous paper P by the first transport device 56 can be switched between 100 [m / min] and 125 [m / min].

  As shown in FIG. 14, after the toner image forming operation is finished, in step 100, the control unit 98 controls the rotation angles of the stepping motors 76 and 90 to rotate the cam members 52 and 86, thereby The side rolls 66 and 82 are moved. Thus, the control unit 44 switches the upstream side holding roll 62 and the downstream side holding roll 78 to a pressing position where the front side rolls 66 and 82 press the continuous paper P against the back side rolls 64 and 80 (FIG. 3B). FIG. 4B). When the front side rolls 66 and 82 are switched to the pressing position where the continuous paper P is pressed against the back side rolls 64 and 80, the process proceeds to step 200.

  In Step 200, the control unit 98 switches the transport speed of the continuous paper P by the first transport device 56 and the upstream holding roll 62 from 100 [m / min] to 125 [m / min], and proceeds to Step 300.

  In step 300, after the conveyance speed by the first conveyance device 56 and the upstream holding roll 62 is switched in step 200, the control unit 98 passes the first conveyance device 56, upstream after 0.4 to 1 [s] has elapsed. The conveyance of the continuous paper P by the side holding roll 62, the downstream side holding roll 78, the second conveying device 58, and the take-up mandrel 14 is stopped (see FIG. 9). Thereby, the line length of the continuous paper P between the upstream side holding roll 62 and the downstream side holding roll 78 becomes long, and the continuous paper P generates a slack of, for example, 80 to 400 [mm]. P is separated from the preheating device 28. When the continuous paper P is separated from the preheating device 28, the process proceeds to step 400.

  In step 400, the control unit 44 controls the rotation angle of the stepping motor 60 to rotate the cam member 52 and move the pressure roll 48. Thereby, the control unit 44 switches the fixing device 30 to a separation position where the pressure roll 48 and the heating roll 46 are separated (see FIGS. 7 and 8).

  As described above, the continuous paper P is separated from the preheating device 28 by increasing the transport speed of the continuous paper P by the first transport device 56 and the upstream holding roll 62. Other operations are the same as those in the first embodiment.

<Fifth Embodiment>
Next, an example of an image forming system according to the fifth embodiment of the present invention will be described with reference to FIGS. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

(overall structure)
As shown in FIG. 17, in the fifth embodiment, the first image forming apparatus 102 as an example of the first image forming apparatus having the same configuration as the image forming apparatus 10 and the first configuration having the same configuration as the image forming apparatus 10 are used. The second image forming apparatus 104 as an example of the second image forming apparatus is arranged in series, and the image forming system 100 is configured including the first image forming apparatus 102 and the second image forming apparatus 104.

  Between the first image forming apparatus 102 and the second image forming apparatus 104, an absorption device that absorbs the difference in the transport amount of the continuous paper P that occurs between the first image forming apparatus 102 and the second image forming apparatus 104. As an example, a buffer device 108 is provided.

  The buffer device 108 moves up and down and is in contact with the back surface (the other surface) of the continuous paper P. The buffer device 108 is disposed on the upstream side in the transport direction with respect to the dancer roll 108A. A driven roll 108B that comes into contact with the surface), and a driven roll 108C that is arranged on the downstream side in the transport direction with respect to the dancer roll 108A and that comes into contact with one side of the continuous paper P.

  The dancer roll 108A moves up and down so that the tension applied to the continuous paper P becomes a constant value, so that the difference in the transport amount of the continuous paper P (particularly, the difference in the transport amount when image formation is stopped) is absorbed. It has come to be. Thereby, the trouble that the continuous paper P is pulled and cut or the continuous paper P is loosened and bent is suppressed.

  Further, a reversing device 110 that reverses one side and the other side of the continuous paper P (front and back) is provided downstream of the buffer device 108 in the transport direction.

  As shown in FIG. 16, the reversing device 110 is disposed obliquely with respect to the conveyance direction of the continuous paper P and the inclined roll 110A around which the continuous paper P is wound, and on the downstream side in the conveyance direction with respect to the inclined roll 110A. And an inclined roll 110B that is disposed obliquely with respect to the conveyance direction of the continuous paper P and around which the continuous paper P is wound.

  Further, between the inclined roll 110A and the inclined roll 110B, a driven roll 110C that changes the conveyance direction of the continuous paper P from the horizontal direction to the vertical direction, and a driven roll that changes the conveyance direction of the continuous paper P from the vertical direction to the horizontal direction. 110D.

  Further, on the downstream side of the inclined roll 110B in the conveyance direction, a driven roll 110E that changes the conveyance direction of the continuous paper P from the horizontal direction to the vertical direction, and a driven roll 110F that changes the conveyance direction of the continuous paper P from the vertical direction to the horizontal direction, Is arranged.

  With this configuration, one side and the other side of the continuous paper P are reversed between the first image forming apparatus 102 and the second image forming apparatus 104 (the front and back sides), and images are formed on both sides of the continuous paper P. It is supposed to be formed.

  In FIG. 17, the driven rolls 110C and 110D are shown separated in the vertical direction from the inclined rolls 110A and 110B so that the arrangement of the driven rolls 110C and 110D can be understood.

(Function)
[When image forming operation is stopped]
As shown in FIG. 15, when the image forming operation is finished and the conveyance of the continuous paper P is stopped, the control unit 114 provided in the first image forming apparatus 102 is provided in the first image forming apparatus 102. After the second transport device 58 is stopped, the first transport device 56 is stopped after a predetermined time has elapsed.

  Similarly, when the image forming operation is finished and the conveyance of the continuous paper P is stopped, the control unit 118 provided in the second image forming apparatus 104 is provided with the second conveyance provided in the second image forming apparatus 104. After the conveyance of the continuous paper P by the apparatus 58 and the winding mandrel 14 is stopped, the conveyance of the continuous paper P by the first conveyance device 56 is stopped after a predetermined time has elapsed.

  A difference in the transport amount of the continuous paper P generated between the first image forming apparatus 102 and the second image forming apparatus 104 is absorbed by the buffer device 108. That is, the dancer roll 108A moves from the initial position, and the difference in the transport amount of the continuous paper P is absorbed.

[When resuming image formation]
When an image is formed again on the continuous paper P, the control unit 114 provided in the first image forming apparatus 102 operates each member provided in the first image forming apparatus 102, and the dancer roll 108A is initially set. After returning to the position, the control unit 118 provided in the second image forming apparatus 104 operates each member provided in the second image forming apparatus 104.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the fifth embodiment, the control unit 114 provided in the first image forming apparatus 102 and the control unit 118 provided in the second image forming apparatus 104 include the second transport device 58 provided in each apparatus. After a certain period of time had elapsed, the first transport device 56 was stopped. However, the control of the first image forming apparatus 102 is left as it is, and the control unit 118 provided in the second image forming apparatus 104 is replaced with the first conveying apparatus 56 and the second conveying apparatus 58 provided in the second image forming apparatus 104. After the winding mandrel 14 is stopped, the second conveying device 58 may be operated in the direction opposite to the conveying direction of the continuous paper P during image formation. In this case, since the difference in the transport amount of the continuous paper P is suppressed between the first image forming apparatus 102 and the second image forming apparatus 104, it may not be necessary to use the buffer device 108.

  Further, in the fifth embodiment, the control unit 114 of the first image forming apparatus 102 and the control unit 118 of the second image forming apparatus 104 are provided separately. The second image forming apparatus may be controlled.

  Further, although not particularly mentioned in the above embodiment, the order of Step 300 and Step 400 may be interchanged with respect to the flow for stopping the conveyance of the continuous paper P.

  Moreover, the said embodiment is illustrated and is not limited to them as this invention, You may combine each embodiment in the range which does not deviate from the meaning of this invention.

  In the above-described embodiment, the conveyance speed of the continuous paper P has been described using specific numerical values. However, the numerical values are not limited to these numerical values, and may be other numerical values. That is, the specific numerical values used in the present embodiment are examples, and other numerical values may be used within the range where the effects of the present invention are achieved.

  The present invention can also be applied to a color image forming apparatus having a plurality of photoconductors.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 16 Conveyance path | route 26 Image forming unit (an example of an image forming part)
28 Preheating device (an example of a heating member)
44 control part 56 1st conveying apparatus 58 2nd conveying apparatus 62 Upstream holding roll (an example of an upstream holding member)
78 downstream holding roll (an example of a downstream holding member)
94 control unit 96 control unit 98 control unit 100 image forming system 102 first image forming apparatus (an example of a first image forming apparatus)
104 First image forming apparatus (an example of a second image forming apparatus)
108 Buffer device (example of absorption device)
110 Inversion device

Claims (7)

A transport path through which continuous paper is transported;
An image forming unit which is provided in the middle of the transport path and forms a toner image on the transported continuous paper;
Heating the toner image formed on the continuous paper in contact with the back surface of the continuous paper, which is provided downstream of the image forming unit in the conveying direction of the continuous paper and has the toner image formed on the front surface A heating member to
A first transport device that is provided upstream of the heating member in the transport direction of the continuous paper and that imparts a transport force to the continuous paper to transport the continuous paper toward the heating member;
Provided downstream of the heating member in the transport direction of the continuous paper, and imparts a transport force for transporting the continuous paper from the heating member toward the downstream side of the transport direction of the continuous paper. A second transfer device;
An upstream holding member that is arranged next to the heating member in the conveyance path on the upstream side in the conveyance direction of the continuous paper with respect to the heating member, and capable of holding the continuous paper;
A downstream holding member that is disposed next to the heating member in the transport path on the downstream side in the transport direction of the continuous paper with respect to the heating member, and capable of holding the continuous paper;
When stopping the conveyance of the continuous paper, the upstream holding member and the downstream holding member are controlled to hold the continuous paper, and the first conveying device and the second conveying device are By controlling the conveying force applied to the continuous paper, the line length of the continuous paper between the upstream holding member and the downstream holding member is longer than that when forming a toner image on the continuous paper. A controller that separates the back surface of the continuous paper from the heating member;
An image forming apparatus comprising:   The image forming apparatus according to claim 1, wherein when the conveyance of the continuous paper is stopped, the control unit stops the first conveyance device after the second conveyance device is stopped.   When stopping the conveyance of the continuous paper, the control unit slows down the conveyance speed of the continuous paper by the second conveyance device as compared with the conveyance speed when the toner image is formed on the continuous paper. The image forming apparatus according to claim 1, wherein the first conveying device and the second conveying device are stopped after a while.   When stopping the conveyance of the continuous paper, the control unit increases the conveyance speed of the continuous paper by the first conveyance device as compared with the conveyance speed when the toner image is formed on the continuous paper. The image forming apparatus according to claim 1, wherein the first conveying device and the second conveying device are stopped after a while.   When stopping the conveyance of the continuous paper, the control unit temporarily stops the conveyance of the continuous paper by the first conveyance device and the second conveyance device, and then the second conveyance device causes the continuous paper to be conveyed. The image forming apparatus according to claim 1, wherein the second transport device is stopped after transporting the continuous paper in a direction opposite to the transport direction. The heating member is provided on the upper side in the vertical direction than the upstream holding member and the downstream holding member, and on the lower side in the vertical direction with respect to the back surface of the continuous paper,
The upstream holding member and the downstream holding member are a pair of rotating bodies each including a rotating body whose diameter changes unevenly along a rotation axis extending in the width direction of the continuous paper. The image forming apparatus according to claim 1. A first image forming apparatus according to claim 1;
A reversing device for reversing the front and back of the continuous paper on which the image is formed on one side by the first image forming device;
The second image forming apparatus according to any one of claims 1 to 5, wherein an image is formed on the other surface of the continuous paper reversed by the reversing device;
Provided between the first image forming apparatus and the second image forming apparatus, and when transporting the continuous paper is stopped, it is transported by the second transport apparatus of the first image forming apparatus. An absorption device that absorbs the difference between the transport amount of the continuous paper and the transport amount of the continuous paper transported by the first transport device of the second image forming apparatus;
An image forming system comprising:

Images