JP6318589B2 - Conveying roller holding mechanism, continuous paper drying device and printing system - Google Patents

Description

  The present invention relates to a conveyance roller holding mechanism and a continuous paper drying device, and more particularly to a technique for reducing problems when continuous paper is not conveyed due to a paper jam or the like.

  There is a printing system that forms an image on a recording medium wound in a roll shape (hereinafter referred to as continuous paper). In this printing system, a continuous paper feeding device is installed upstream of the continuous paper conveyance direction, and a continuous paper winding device is installed downstream. Then, the winding operation of the winding device is performed to apply tension to the continuous paper, so that the continuous paper moves along the transport direction. Inside the printing system, a conveyance roller disposed along the conveyance path of the continuous paper and a driving device that rotationally drives the conveyance roller are provided. Since the operation of the conveying member such as the conveying roller, the driving device, and the winding device is designed in accordance with the state in which the continuous paper is normally conveyed, the conveying member is not overloaded during normal conveyance. .

  However, if the actual continuous paper conveyance speed and the paper feeding operation speed by the paper feeding device (or the winding speed by the winding device) do not match, abnormal tension is generated in the continuous paper. This abnormal tension may cause damage to the conveying member.

  As a technique for solving the above-described problem, Japanese Patent Laid-Open No. 2004-228561 discloses that when a trailing end of continuous paper is detected, the paper cutting mode of continuous paper is detected and abnormality is detected in the driving unit of the paper feed mechanism. A configuration is disclosed in which the means is stopped and the driving of the driving means is resumed after the completion of paper cutting. This prevents damage to the driving means.

  According to Patent Document 1, it is possible to solve the problem that an overcurrent occurs due to the operation of the paper feed mechanism even though continuous paper is not fed to the driving means included in the paper feed mechanism. However, the influence of the abnormal tension described above does not reach only the driving means of the paper feed mechanism. In particular, an abnormal tension is applied to a member that contacts the continuous paper, for example, the conveyance roller, from the contact surface of the continuous paper. However, Patent Document 1 does not consider the influence on the conveyance roller, and still damages the conveyance roller. There is a problem that it cannot be reduced.

  The present invention has been made in view of the above problems, and provides a transport roller holding mechanism and a continuous paper drying device that alleviate damage to the transport roller even when excessive tension is generated on the continuous paper. Objective.

In order to solve the above-described problems, the conveyance roller holding mechanism according to the present invention is in contact with the continuous paper to be subjected to image formation, and rotates from the upstream to the downstream in the conveyance direction of the continuous paper. A transport roller that forms a paper transport path; a roller support member that rotatably supports the transport roller; a holding member that rotatably supports the roller support member; and the roller support member, A cutting member including a cutting blade for cutting continuous paper, the rotation center of the roller support member is at a position different from the rotation center of the transport roller, and the cutting member is a rotation center of the roller support member Further, it is further provided on the downstream side in the transport direction and on the opposite side of the rotation center of the transport roller across the rotation center of the roller support member .

Further, the continuous sheet drying apparatus according to the present invention includes a liquid coupling portion coupled to the processing solution to the continuous paper, and a drying unit for drying the continuous paper after applying the treatment solution, wherein the drying A heating roller for heat-treating the continuous paper is provided on the upstream side in the transport direction in the section, and a transport roller for forming a transport path for the continuous paper is provided on the downstream side in the transport direction. It is held by a holding mechanism of the transport roller.

  ADVANTAGE OF THE INVENTION According to this invention, the holding mechanism of a conveyance roller and the continuous paper drying apparatus which relieve the damage to a conveyance roller can be provided.

Schematic configuration diagram of a printing system 100 according to the present embodiment 1 is a block diagram showing a hardware configuration of the image forming apparatus 3 in FIG. Block diagram showing the functional configuration of the image forming apparatus 3 Explanatory drawing which shows the internal structure of the pre-processing apparatus 2 of FIG. Schematic perspective view showing an idler roller holding mechanism provided in the pretreatment device 2 Explanatory drawing which shows the state which attached the cutter to the holding mechanism of the idler roller Explanatory drawing showing the state of the idler roller holding mechanism during normal conveyance Explanatory drawing which shows the state of the holding mechanism of the idler roller when conveyance abnormality occurs It is a figure which shows an example of the state which a cutting member cut | disconnects continuous paper, Comprising: The state which the cutting blade contacted the whole width direction of continuous paper is shown. It is a figure which shows an example of the state which a cutting member cut | disconnects continuous paper, Comprising: The state which the cutting blade contacted to the one side (width direction of the paper surface of FIG. 10) of the width direction of continuous paper is shown. It is a figure which shows an example of the state which a cutting member cut | disconnects continuous paper, Comprising: The state which the cutting blade contacted to the one side (width direction of the paper surface of FIG. 11) of the width direction of continuous paper is shown. Explanatory drawing which shows another aspect of the holding mechanism of an idler roller

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, an example in which the present invention is applied to a continuous paper drying apparatus included in a printing system that forms an image on continuous paper that is a roll-shaped storage medium will be described. First, based on FIG. 1, the structure of a printing system including a continuous paper drying apparatus using the conveyance roller holding mechanism according to the present invention will be described. FIG. 1 is a schematic configuration diagram of a printing system according to the present embodiment.

  A printing system 100 illustrated in FIG. 1 includes a paper feeding device 1, a preprocessing device 2, an image forming device 3, a postprocessing device 4, and a winding device 5.

  The paper feeding device 1 sets the continuous paper 10 wound up in a roll shape and discharges it to the preprocessing device 2. The pretreatment device 2 is a device that adheres the pretreatment liquid onto the continuous paper 10 and dries it for the purpose of preventing bleeding and show-through of the ink liquid adhering to the continuous paper 10 in the image forming apparatus 3. The image forming apparatus 3 forms an image on the preprocessed continuous paper 10 and discharges the continuous paper 10. Therefore, the continuous paper 10 becomes an image recording medium. The post-processing device 4 performs post-processing on the continuous paper 10 discharged from the image forming device 3. The winding device 5 winds the post-processed continuous paper 10 in a roll shape. When the winding device 5 winds the continuous paper 10 in a roll shape, tension is applied to the continuous paper 10, and the continuous paper 10 is conveyed from the paper feeding device 1 toward the winding device 5. Hereinafter, in the conveyance direction of the continuous paper 10, the side close to the paper feeding device 1 is referred to as upstream, and the side close to the winding device 5 is referred to as downstream.

  In the printing system 100, the paper feeding device 1, the preprocessing device 2, the image forming device 3, the postprocessing device 4, and the winding device 5 are appropriately selected according to the content of the print processing to be executed or the connection order is changed. You may do it. For example, when the post-processing device 4 is formed as a device that performs bookbinding, folding, or cutting processing, a winding device 5 is connected downstream of the image forming device 3, and post-processing is performed downstream of the winding device 5. The device 4 may be connected. Further, when the roll-shaped continuous paper 10 does not require pre-processing or when a roll around which the pre-processed continuous paper 10 is wound is set in the paper feeding device 1, The image forming apparatus 3 may be connected instead of the processing apparatus 2.

  In the present embodiment, it is assumed that the overall processing of the printing system 100 is performed by the controller of the image forming apparatus 3. That is, the image forming apparatus 3 is a device (hereinafter referred to as “external connection device”) that is directly or indirectly connected among the paper feeding device 1, the preprocessing device 2, the postprocessing device 4, or the winding device 5. If an overall process is necessary, for example, an operation such as an emergency stop for all devices is performed.

  On the other hand, each of the paper feeding device 1, the preprocessing device 2, the image forming device 3, the postprocessing device 4, and the winding device 5 included in the printing system 100 is also an information processing such as a general server or a PC (Personal Computer). In addition to the same configuration as the terminal, it has an engine for executing functions specific to each device. Thereby, in addition to executing a command from the image forming apparatus 3, an operation unique to each apparatus is executed independently.

  In the following, with reference to FIG. 2, the hardware configuration will be described by taking the image forming apparatus 3 that performs the overall processing of the printing system 100 as an example, but the paper feeding apparatus 1, the preprocessing apparatus 2, the postprocessing apparatus 4, The winding device 5 also has a similar hardware configuration. FIG. 2 is a block diagram showing a hardware configuration of the image forming apparatus 3 of FIG.

  As shown in FIG. 2, the image forming apparatus 3 according to the present embodiment includes an engine that executes image formation in addition to the same configuration as an information processing terminal such as a general server or a PC (Personal Computer). That is, the image forming apparatus 3 according to the present embodiment includes a CPU (Central Processing Unit) 30, a RAM (Random Access Memory) 31, a ROM (ReA / D Only Memory) 32, an engine 33, an HDD (Hard Disk Drive) 34, and the like. An I / F 35 is connected via a bus 38. In addition, an LCD (Liquid Crystal Display) 36 and an operation unit 37 are connected to the I / F 35. Further, transmission / reception of signals to / from an external connection device connected to the image forming apparatus 3 is performed via the I / F 35.

  The CPU 30 is a calculation unit and controls the operation of the entire image forming apparatus 3. The RAM 31 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 30 processes information. The ROM 32 is a read-only nonvolatile storage medium and stores a program such as firmware. The engine 33 is a mechanism that actually executes image formation in the image forming apparatus 3.

  The HDD 34 is a non-volatile storage medium that can read and write information, and stores an OS (Operating System), various control programs, application programs, and the like. The I / F 35 connects and controls the bus 38 and various hardware and networks. The LCD 36 is a visual user interface for the user to check the state of the printing system 100. The operation unit 37 is a user interface such as a keyboard and a mouse for the user to input information to the printing system 100.

  In such a hardware configuration, a program stored in a recording medium such as the ROM 32, the HDD 34, or an optical disk (not shown) is read into the RAM 31, and operates according to the control of the CPU 30, thereby configuring a software control unit. A functional block that realizes the function of the image forming apparatus 3 is configured by a combination of the software control unit configured as described above and hardware.

  Next, a functional configuration of the image forming apparatus according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating a functional configuration of the image forming apparatus 3. As illustrated in FIG. 3, the image forming apparatus 3 included in the printing system 100 includes a controller 140, a display panel 124, a paper feed mechanism 125, a print engine 126, a paper discharge mechanism 127, and an external connection device I / F 128.

  The controller 140 includes a main control unit 130, an engine control unit 131, an input / output control unit 132, an image processing unit 133, and an operation display control unit 134. In FIG. 2, the electrical connection is indicated by solid arrows, and the flow of paper is indicated by broken arrows.

  The display panel 124 is an output interface that visually displays the state of the image forming apparatus 3, and an input interface when a user directly operates the printing system 100 or inputs information to the image forming apparatus 3 as a touch panel. (Operation unit). The external connection device I / F 128 is an interface for communicating with other devices via a network or an inter-device connection cable, and uses an Ethernet (registered trademark) or a USB (Universal Serial Bus) interface.

  The controller 140 is configured by a combination of software and hardware. Specifically, a control program such as firmware stored in a ROM 32, a non-volatile memory, and a non-volatile recording medium such as the HDD 34 or an optical disk is loaded into a volatile memory (hereinafter referred to as a memory) such as a RAM 31 to control the CPU 30. The controller 140 includes a software control unit configured according to the above and hardware such as an integrated circuit. The controller 140 functions as a control unit that controls the entire printing system 100.

  The main control unit 130 plays a role of controlling each unit included in the controller 140 and gives a command to each unit of the controller 140. The engine control unit 131 serves as a drive unit that controls or drives the print engine 126.

  The input / output control unit 132 inputs a signal or a command input via the external connection device I / F 128 to the main control unit 130. The main control unit 130 also controls the input / output control unit 132 to access other devices via the external connection device I / F 128.

  The image processing unit 133 generates drawing information based on the print information included in the input print job in accordance with the control of the main control unit 130. The drawing information is information for drawing an image to be formed in the image forming operation by the print engine 126 as an image forming unit. The print information included in the print job is image information converted into a format that can be recognized by the printing system 100 by a printer driver installed in an information processing apparatus such as a PC. The operation display control unit 134 displays information on the display panel 124 or notifies the main control unit 130 of information input via the display panel 124.

  In the printing system 100, first, the input / output control unit 132 receives a print job via the external connection device I / F 128. The input / output control unit 132 transfers the received print job to the main control unit 130. When receiving the print job, the main control unit 130 controls the image processing unit 133 to generate drawing information based on the print information included in the print job.

  When drawing information is generated by the image processing unit 133, the engine control unit 131 executes image formation on a sheet conveyed from the sheet feeding mechanism 125 based on the generated drawing information. That is, the print engine 126 functions as an image forming unit. A document on which an image has been formed by the print engine 126 is discharged out of the apparatus by a discharge mechanism 127.

  In the printing system 100, the continuous paper 10 discharged from the paper feeding device 1 is conveyed to the winding device 5 via the preprocessing device 2, the image forming device 3, and the postprocessing device 4. Each device contacts the continuous paper 10 to be subjected to image formation along the internal conveyance path, and rotates from the upstream to the downstream in the conveyance direction of the continuous paper 10 to change the conveyance path of the continuous paper 10. A conveying roller is provided. The conveying roller includes both a driving roller that is connected to a driving device (not shown) and that is rotationally driven along the conveying speed, and a roller that is formed as a so-called idler roller that is driven by the conveying movement of the continuous paper 10. A tension is applied to the continuous paper 10 from the upstream side to the downstream side in the conveyance direction by the winding operation of the winding device 5. The conveyance roller formed as an idler roller is driven to rotate by the tension applied to the conveyance roller from the contact portion when the continuous paper 10 contacts the surface of the conveyance roller.

  When the transport operation is normally performed, the continuous paper is moved from the upstream to the downstream in the transport direction by the tension applied by the winding operation, and the transport roller is rotated accordingly.

  However, when a paper jam occurs upstream of the conveyance roller, the winding operation by the winding device 5 continues in the same manner as during normal conveyance, even though the conveyance of the continuous paper stops when the paper jam occurs. As a result, the continuous paper is applied with a greater tension than normal (hereinafter referred to as “abnormal tension”).

  The gist of the present invention is that the position of the idler roller changes according to the tension applied to the continuous paper in order to suppress damage to the idler roller caused by the abnormal tension pushing the idler roller from the contact portion with the continuous paper. To rotate and move. Hereinafter, an embodiment of the present invention will be described by taking an idler roller provided in the pretreatment device 2 as an example, but the present invention is not limited to the pretreatment device, and is on the conveyance path of the continuous paper 10. The present invention can be applied to an idler roller or a driving roller as long as it is a conveyance roller with which the continuous paper 10 abuts. Hereinafter, the configuration of the pre-processing apparatus will be described with reference to FIG. FIG. 4 is an explanatory diagram showing the internal configuration of the pre-processing device 2 of FIG.

  As shown in FIG. 4, the pretreatment device 2 includes a liquid adhesion unit 20 that adheres the pretreatment liquid to the continuous paper 10, a drying unit 21 that dries the continuous paper 10 after the pretreatment liquid is applied, and a liquid adhesion unit. 20 and a feeding conveyance roller 25 that conveys the continuous paper 10 to the drying unit 21. Therefore, the pretreatment device 2 of the present embodiment is a continuous paper drying device including a liquid adhesion unit and a drying unit. The continuous paper 10 is sent in the direction indicated by the arrow A from the liquid adhesion unit 20 to the drying unit 21 via the supply transport roller 25. The continuous paper 10 in FIG. 4 is a continuous paper having an arbitrary length wound in a roll shape, but may be a relatively long sheet. The material of the continuous paper 10 may be paper, a plastic sheet, or the like that may be damaged (damaged) by wrinkles or deformation due to heat. Therefore, in the present embodiment, the continuous paper is not limited to paper, and means a long recording medium regardless of the material.

  The drying unit 21 includes a first stage heating roller set 210 including a first stage back surface heating roller 210a and a first stage surface heating roller 210b, and a second stage including a second stage back surface heating roller 220a and a second stage surface heating roller 220b. A stage heating roller set 220, a third stage heating roller set 230 including a third stage back surface heating roller 230a and a third stage surface heating roller 230b, a discharge idler roller (hereinafter abbreviated as "idler roller") 240, And a control device 290.

  Each heating roller 210 a, 210 b, 220 a, 220 b, 230 a, 230 b is formed in a cylindrical shape, and the axial direction of the cylinder (rotational axis direction) is orthogonal to the conveyance direction of the continuous paper 10 with the axial direction of the cylinder as the rotational axis. To be arranged. Then, the heating rollers 210a, 210b, 220a, 220b, 230a, and 230b are rotatably supported by bearings (not shown) on a fixed body (for example, the casing 21a of the drying unit 21) at both ends of the rotation shafts.

  The first-stage heating roller set 210, the second-stage heating roller set 220, and the third-stage heating roller set 230 are arranged side by side along the conveyance direction from upstream to downstream in the conveyance path of the continuous paper 10 in the drying unit 21. Is done.

  First stage back surface heating roller 210a and first stage surface heating roller 210b, second stage back surface heating roller 220a, second stage surface heating roller 220b, third stage back surface heating roller 230a and third stage surface heating roller 230b are The rear surface heating rollers 210a, 220a, and 230a are spaced apart from each other, and the heights from the reference positions of the front surface heating rollers 210b, 220b, and 230b are different from each other. Here, the “reference position” refers to, for example, the bottom surface of the casing 21 a of the drying unit 21. In FIG. 4, the rotation shafts of the first-stage backside heating roller 210a, the second-stage backside heating roller 220a, and the third-stage backside heating roller 230a are arranged at positions where the height from the bottom surface of the housing 21a is H1. Is done. Further, the rotation shafts of the first stage surface heating roller 210b, the second stage surface heating roller 220b, and the third stage surface heating roller 230b are arranged at positions where the height from the bottom surface of the housing 21a is H2.

  That is, a line connecting the respective rotation centers of the first stage back surface heating roller 210a, the second stage back surface heating roller 220a, and the third stage back surface heating roller 230a, in other words, the first stage back surface heating roller 210a and the second stage back surface heating roller. The surface including all of the rotation axes of the roller 220a and the third stage back surface heating roller 230a, and the respective rotation centers of the first stage surface heating roller 210b, the second stage surface heating roller 220b, and the third stage surface heating roller 230b Are parallel to each other (a surface including all the rotation axes of the first-stage surface heating roller 210b, the second-stage surface heating roller 220b, and the third-stage surface heating roller 230b) and are separated in the height direction from the reference position. To be arranged.

  In each of the heating rollers 210a, 210b, 220a, 220b, 230a, and 230b, heaters 211a, 211b, 221a, 221b, 231a, and 232b such as halogen lamps are disposed in the center of each heating roller. Thereby, the surface of each heating roller 210a, 210b, 220a, 220b, 230a, 230b can be heated, and a continuous paper can be heat-processed. Further, a temperature sensor (not shown) such as a thermistor or a thermopile for detecting the surface temperature of each heating roller 210a, 210b, 220a, 220b, 230a, 230b is provided with each heating roller 210a, 210b, 220a, 220b, 230a, 230b. Is provided.

  The continuous paper 10 has a first stage back surface heating roller 210a, a first stage surface heating roller 210b, a second stage back surface heating roller 220a, a second stage surface heating roller 220b, and a third stage back surface heating roller from upstream to downstream in the transport direction. While passing around 230a and the third stage surface heating roller 230b in order, the heating rollers 210a, 210b, 220a, 220b, 230a, and 230b pass in this order.

  Downstream of the conveying path in the drying unit 21, an idler roller 240, a roller support member 256 that supports the idler roller 240 (see FIG. 5), and a holding member that rotatably holds the roller support member 256 (shaft 270, FIG. 5) is disposed. The holding mechanism 250 includes a hipper coil spring 260 as an elastic member and a plate 280 for engaging the hipper coil spring 260 with the case 21a, and is attached to the case 21a via these.

  A cutter 300 is provided above the holding mechanism 250. Further, the housing 21 a is provided with a protective cover 310 for protecting from the cutting blade 301 of the cutter 300.

Next, the idler roller holding mechanism will be described with reference to FIG. FIG. 5 is a schematic perspective view showing a holding mechanism of the idler roller provided in the pretreatment device 2. As shown in FIG. 5, the idler roller 240 is formed in a columnar shape, and the axial direction of the column is the rotation axis. The cylindrical axis direction (rotational axis direction) is orthogonal to the conveying direction of the continuous paper 10.

  The roller support member 256 is disposed at each end portion of the rotation shaft 241 of the idler roller 240, and includes two support portions 251-1 and 251-2 that support the respective end portions of the rotation shaft 241 and two support portions 251. -1 and 251-2. Hereinafter, the term “roller support member 256” is a generic name including the two support portions 251-1 and 251-2 and the connecting portion 252.

  The two support portions 251-1 and 251-2 are arranged along the rotational axis direction of the idler roller 240 with an interval corresponding to the width of the idler roller. And the connection part 252 connects the conveyance direction downstream side of each roller support part 251-1, 251-2. That is, the holding mechanism 250 causes the support portions 251-1 and 251-2 to protrude in the direction from the downstream side to the upstream side with respect to the connecting portion 252, and the two support portions 251-1 and 251-2 are The idler rollers 240 are arranged to face each other with a gap in the direction along the rotation shaft 241 (hereinafter referred to as “roller width direction”). An idler roller 240 is disposed in the gap.

  Specifically, the support portions 251-1 and 251-2 include roller bearings 253-1 and 253-2 that rotatably support the idler roller 240. And each edge part of the rotating shaft 241 of the idler roller 240 is supported by the roller bearings 253-1 and 253-2. The idler roller 240 rotates in the direction from the upstream to the downstream in the transport direction by the tension received from the abutting continuous paper 10 with the rotation shaft 241 as the center of rotation.

  The ends on the upstream side in the transport direction of the support portions 251-1 and 251-2 are formed as open ends that are not connected to a fixed body (for example, the casing 21a).

  Through holes 254-1 and 254-2 are provided in the roller support portions 251-1 and 252-2 on the downstream side in the transport direction from the roller bearings 253-1 and 252-2.

  The shaft 270 is substantially parallel to the rotation shaft 241 of the idler roller 240 and is positioned differently from the rotation shaft 241 of the idler roller 240, that is, on the axial extension of the rotation shaft 241 of the idler roller 240. Are attached to the housing 21a at different positions.

  The shaft 270 is passed through the through holes 254-1 and 254-2, and both end portions of the shaft 270 in the axial direction are fixed to the casing 21a of the drying unit 21. Accordingly, the support portions 251-1 and 251-2 are coupled to the housing 21a via the shaft 270 so as to be movable in the rotational direction. Since the shaft 270 only supports the support portions 251-1 and 251-2 in the through holes 254-1 and 254-2, the roller support member 256 is supported rotatably about the shaft 270. The As a result, the idler roller 240 and the roller support member 256 are integrally rotated about the shaft 270 as the rotation center.

  The lower end part of the connection part 252 is connected with the housing | casing 21a of the drying part 21 via two hiper coil springs 260-1 and 260-2 as an elastic body. In the present embodiment, the upper end portions of the two spiral coil springs 260-1 and 260-2 are connected to each other at two locations spaced apart along the roller width direction of the idler roller 240 among the lower end portions.

  The lower ends of the flip coil springs 260-1 and 260-2 are connected to a plate 280 (see FIG. 4). The plate 280 meshes with a groove 21b (see FIG. 7) provided in the housing 21a and is fixedly supported to the housing 21a. The groove 21b is provided in a plurality of stages along the height direction of the housing 21a. When the position of the groove 21b that engages the plate 280 is changed, the amount of extension of the flipper coil springs 260-1 and 260-2 can be changed.

  That is, the roller support member 256 is supported by the casing 21a through the elastic force of the flip coil springs 260-1 and 260-2 and is supported rotatably about the shaft 270.

  The elastic force of the flip coil springs 260-1 and 260-2 is pulled in the direction of the plate 280 with respect to the roller support members 251-1 and 251-2 and the connecting portion 252 because the plate 280 is fixedly supported by the housing 21a. Acts in the direction. At this time, a moment with the shaft 270 as the center of rotation is generated in the roller support member 256. A moment in the direction of arrow B always acts on the upstream end of the roller support member 256 in the conveying direction.

  Accordingly, the stopper 271 for preventing the upstream end of the roller support member 256 in the conveying direction from bouncing up and the roller support member 256 are rotated and contacted when an abnormal tension is applied, and the movement in the rotation direction is suppressed. A stopper 272 is provided.

  The stoppers 271 and 272 are fixed to the housing 21a. The position of the roller support member 256 is determined in a state where the upper ends of the support portions 251-1 and 251-2 of the roller support member 256 abut against the stopper 271. Thereby, the idler roller 240 is disposed at a predetermined position, and the continuous paper 10 is wound around the idler roller 240 at a constant winding angle.

  On the downstream side of the holding mechanism 250 in the transport direction, a cutter 300 as a cutting member for cutting the continuous paper 10 when transport is abnormal and a protective cover 310 that covers the cutting blade 301 of the cutter 300 during normal transport are provided. The protective cover 310 is configured separately from the holding mechanism 250 and is configured to protrude toward the continuous paper 10 from the cutting blade 301 when the holding mechanism 250 is not rotating. That is, the protective cover 310 functions as a protective member for the cutter 300 as a cutting member.

  Next, a cutter mounting structure will be described with reference to FIG. FIG. 6 is an explanatory view showing a state where the cutter is attached to the holding mechanism of the idler roller.

  One positioning protrusion 255-1 and 255-2 is provided at each end of the connecting portion 252 along the roller axis direction. In addition, the cutter 300 is provided with two holes for fitting the positioning protrusions 255-1 and 255-2. One is a long hole 302 having a width corresponding to the diameter of the positioning protrusion 255-1 and a width for allowing a positional shift when the cutter 300 is mounted along the roller axis direction, and the other is a positioning. It is a hole 303 corresponding to the diameter of the protrusion 255-2. When the cutter 300 is exchanged, the positioning projections 255-1 and 255-2 are passed through the long holes 302 and 303 so that the cutter 300 is always attached at the same position.

  Further, a protective cover 310 protruding from the cutting blade 301 of the cutter 300 is attached to the housing 21a. In a normal state, the cutting blade 301 of the cutter 300 is arranged inside the protective cover 310 so as not to contact the continuous paper 10. Further, the protective cover 310 is also fixed at a position where it does not come into contact with the continuous paper 10 wound around the idler roller 240 in a normal state, and has a structure that does not affect the transportability of the continuous paper 10.

  Next, with reference to FIG. 7 and FIG. 8, the movement of the unloading idler roller and the holding mechanism during normal conveyance and when conveyance abnormality occurs will be described. FIG. 7 is an explanatory diagram showing a state of the idler roller holding mechanism during normal conveyance. FIG. 8 is an explanatory diagram showing a state of the idler roller holding mechanism when a conveyance abnormality occurs.

The continuous paper 10 dried by the heating rollers 210 a, 210 b, 220 a, 220 b, 230 a, 230 b located upstream in the conveying method is sent to the image forming apparatus 3 in a state of being wound around the idler roller 240 at an arbitrary angle. . The continuous paper 10 is tensioned at a substantially constant value. The force applied to the idler roller 240 is F1, and the force applied to the flip coil springs 260-1 and 260-2 is F2. The center of the shaft 270 is determined from the respective action points. Where L1 and L2 are distances up to F1 × L1 <F2 × L2 (1)
Even when the tension setting is changed depending on the thickness of the continuous paper 10 or the like, the force F <b> 2 applied to the hiper coil springs 260-1 and 260-2 is set so as to satisfy the above formula (1). For this reason, the roller support members 251-1 and 251-2 are always in contact with the stopper 271 during normal conveyance. Therefore, the position of the idler roller 240 does not move from the position of the idler roller 240 (referred to as “fixed position”) in a state where the support portions 251-1 and 251-2 are in contact with the stopper 271. Even if the operator accidentally pushes the idler roller 240, the force of F2 is designed so that the cutting blade 301 of the cutter 300 does not pop out, and the cutting blade 301 of the cutter 300 does not pop out carelessly. . Furthermore, since the cutting blade 301 of the cutter 300 is hidden inside the protective cover 310, the operator is not injured by the cutting blade 301 of the cutter 300.

  Here, when the printing system 100 operates normally and the continuous paper 10 is pulled upstream, a paper jam or the like may occur in the paper feeding device 1 or the heating rollers 210a, 210b, 220a, 220b, 230a, 230b on the downstream side. When the movement on the paper feeding side stops, the continuous paper 10 is pulled only on the upstream side. In the drying device 21, since the continuous paper 10 is wound around the heating rollers 210a, 210b, 220a, 220b, 230a, and 230b, excessive tension is applied to the drying device 21 and the device may be damaged.

  In this case, excessive tension is applied to the idler roller 240, and the value of F1 increases, so that the relationship expressed by the above equation (1) is changed to the relationship expressed by the following equation (2).

F1 × L1> F2 × L2 (2)
As a result, the contact surface of the continuous paper 10 in the idler roller 240 is pushed in a direction perpendicular to the continuous paper 10. When the idler roller 240 is pushed, the support portions 251-1 and 251-2 rotate around the shaft 270 as shown in FIG. 8 from the state shown in FIG. The cutting blade 301 of the cutter 300 attached downstream in the transport direction −2 is pushed up. Then, the cutting blade 301 of the cutter 300 contacts the continuous paper 10 and cuts the continuous paper 10.

  Based on FIG. 9 thru | or FIG. 11, the state which the cutting blade 301 of the cutter 300 and the continuous paper 10 contacted at the time of continuous paper cutting is demonstrated. FIG. 9 is a diagram illustrating an example of a state where the cutting member cuts the continuous paper, and shows a state where the cutting blade is in contact with the entire width direction of the continuous paper. FIG. 10 is a diagram illustrating an example of a state in which the cutting member cuts the continuous paper, and shows a state in which the cutting blade is in contact with one side in the width direction of the continuous paper (the left side in FIG. 10). FIG. 11 is a diagram illustrating an example of a state in which the cutting member cuts the continuous paper, and shows a state in which the cutting blade is in contact with one side of the continuous paper in the width direction (the right side in FIG. 11).

  In FIG. 9, since the cutting blade 301 of the cutter 300 is in contact with the entire surface of the continuous paper 10, the continuous paper 10 is easily cut. However, it does not necessarily contact the entire surface, and it is assumed that the continuous paper 10 contacts the cutting blade 301 of the cutter 300 while being inclined as shown in FIGS. 10 and 11. Even in this case, the tip of the cutting blade 301 of the cutter 300 is formed in a sawtooth wave shape, so that the pressure applied to the contact surface with the continuous paper 10 is increased, and it can be reliably cut regardless of the contact state. It is like that. When the continuous paper 10 is cut, an abnormal tension is not applied to the continuous paper 10 and the force for pushing the idler roller 240 is also lost. As a result, the state shown in FIG. 8 returns to the state shown in FIG. 7, and the idler roller 240 is not pushed in with an abnormal tension and damage is not continuously applied.

  Even when an excessive force is applied by cutting the continuous paper 10 and the cutting blade 301 of the cutter 300 is damaged, it can be removed and replaced, so that it can be replaced with a new blade. When the idler roller 240 is pushed by the continuous paper 10, a stopper 272 is provided on the pushing direction side so as not to be pushed beyond a certain distance as shown in FIG. The movement along the rotation direction due to the movement stops. The stopper 272 is set to a distance that secures a position where the cutting blade 301 of the cutter 300 sufficiently protrudes. Since the rotation angle of the roller support member 256 is regulated by the stoppers 271 and 272 set above and below the roller support member 256, there is no fear that the force coil springs 260-1 and 260-2 are excessively applied and damaged.

In addition, when it is desired to operate the cutting blade 301 of the cutter 300 when a stronger force is applied due to the specifications of the continuous paper 10 (or when a weak force is applied), the coiler springs 260-1, 260 are used. -2 is attached, and the position of the groove 21b provided in the housing 21a into which the plate 280 is fitted is changed. Thereby, the elongation amount of the flipper coil springs 260-1 and 260-2 can be adjusted. That is, the groove 21b forms an elastic member holding portion that holds the elastic member by changing the extension amount. That is, the upper ends of the hiper coil springs 260-1 and 260-2 are connected to the through holes 254-1 and 254-2, and a line connecting the lower end, the central axis of the shaft 240 and the central axis of the rotation shaft 241 of the transport roller 240. Is connected to the casing 21a on the opposite side of the conveying roller 240 from the contact point of the continuous paper 10 according to the present embodiment. According to the present embodiment, when an abnormal tension is applied to the continuous paper (recording medium), the conveying roller It is possible to reduce damage to the device and prevent damage to the device. More specifically, the idler roller for rotation can be rotated around the shaft by attaching the idler roller for discharging through the shaft to the fixed body (in the above, the frame of the drying device). As a result, when an abnormal tension (a tension above a certain level) is applied to the discharge idler roller, the discharge idler roller rotates and releases the tension received from the continuous paper, thereby preventing the discharge idler roller from being damaged. .

  Furthermore, the roller support portion of the discharge idler roller is connected to the fixed body (the frame of the drying device in the above) via the elastic body on the opposite side of the discharge idler roller via the shaft, so that it is continuous with the idler roller. A force can be applied in the direction opposite to the direction in which the paper is pushed in due to the tension from the paper. This facilitates the rotational movement of the roller support member around the shaft even when abnormal tension occurs. Furthermore, the amount of extension of the elastic body can be adjusted, or the elastic body can be easily attached and removed, so that the pushing amount of the discharge idler roller can be adjusted according to the specifications, for example, the material of the recording medium and the tension applied thereto. .

  Further, a cutting blade is provided on the opposite side of the rotation center of the roller support member and the shaft 270 in the above embodiment, and the continuous paper is cut by cutting the continuous paper when the roller support member rotates around the shaft. It is possible to prevent the abnormal tension from being continuously applied to the paper. In addition, the cutting blade can be easily replaced by being detachably attached using a fastening member such as a screw. Moreover, by making the cutting blade into a corrugated shape, the continuous paper can be cut no matter how the continuous paper comes into contact with the cutting blade.

  The said embodiment is only what described an example of embodiment of this invention, and does not limit this invention. There may be various embodiments without departing from the technical scope of the present invention. For example, in the above-described embodiment, the first coil springs 260-1 and 260-2 have the first end portion on the downstream side in the transport direction with reference to the through holes 254-1 and 254-2 in the support portions 251-1 and 251-2. The second end portion was connected to the casing 21a below the support portions 251-1 and 251-2. As a result, a force (moment) opposite to the force indicated by the arrow F1 in FIG. 7 acts on the roller bearings 253-1 and 253-2 in the support portions 251-1 and 251-2. This moment and the force applied from the continuous paper to the idler roller balance, and the position of the idler roller is kept constant during normal conveyance.

  That is, the hiper coil springs 260-1 and 260-2 act in a direction in which the force resulting from the elastic force resists the force pushed in the direction perpendicular to the surface of the continuous paper 10 applied to the contact portion of the idler roller 240. It suffices to be connected to the support portions 251-1, 251-2 or the connection portion 252.

  Therefore, another embodiment of the idler roller holding mechanism will be described with reference to FIG. FIG. 12 is an explanatory view showing another aspect of the idler roller holding mechanism. As shown in FIG. 12, the end coil springs 260-1 and 260-2 are connected at one end upstream in the transport direction with reference to the through holes 254-1 and 254-2 in the support portions 251-1 and 251-2, The other end portion may be connected to the housing 21a above the support portions 251-1 and 251-2 in the drawing in FIG. 11, and the upstream side in the transport direction of the support portions 251-1 and 251-2 may be picked up. Even in such a configuration, if the lifting force and the force indicated by the arrow F1 in FIG. 12 are balanced, the idler roller 240 is kept at a constant position during normal conveyance, and if a conveyance abnormality occurs, the flipper coil spring 260-1, 260-2 extends, and the idler roller 240 and the roller support member 256 can rotate. In another aspect, when the roller support member is connected to the housing via the elastic body, the force due to the elastic force of the elastic member is applied to the continuous paper surface applied to the contact point of the continuous paper in the transport roller. This is a mode in which the roller support member 256 is connected so as to act in a direction against a force pushed in the vertical direction. In addition to the case where the elastic force of the elastic member is directly opposite to the direction of the force pushed in the vertical direction, the elastic force of the elastic member includes a component that resists the force pushed in the vertical direction. Including cases where

  Further, the mechanism for rotatably supporting the roller support portion on the casing is not limited to the combination of the shaft and the through hole, and a rotary bearing may be used.

DESCRIPTION OF SYMBOLS 1 Paper feeder 2 Pre-processing apparatus 3 Image forming apparatus 4 Post-processing apparatus 5 Winding apparatus 10 Continuous paper 20 Liquid adhesion part 21 Drying part 21a Housing | casing 21b Groove part 25 Supply conveyance roller 30 CPU
31 RAM
32 ROM
34 HDD
35 I / F
36 LCD
37 Operation unit 38 Bus 100 Printing system 140 Controller 124 Display panel 125 Paper feed mechanism 126 Print engine 127 Paper discharge mechanism 130 Main control unit 131 Engine control unit 132 Input / output control unit 133 Image processing unit 134 Operation display control unit 210 First stage Heating roller set
210a 1st stage back surface heating roller 210b 1st stage surface heating roller 211a, 211b Heater 220 2nd stage heating roller set 220a 2nd stage back surface heating roller 220b 2nd stage surface heating roller 221a, 221b Heater 230 3rd stage heating roller set 230a Third stage rear surface heating roller 230b Third stage front surface heating roller 231a, 231b Heater 240 Ejection idler roller 241 Rotating shaft
250 Holding mechanism 251-1, 251-2 Support portion 252 Connecting portion 253-1, 255-2 Roller bearing 254-1, 254-2 Through-hole 255-1, 255-2 Positioning protrusion 260-1, 260-2 Hipperary coil spring 256 Roller support member 270 Shaft 271 Stopper 272 Stopper 280 Plate 290 Controller 300 Cutter 301 Cutting blade 302 Long hole 303 Hole 310 Protective cover

JP-A-9-249341

Claims (11)

A transport roller that contacts a continuous paper to be subjected to image formation and rotates from upstream to downstream in the transport direction of the continuous paper to form a transport path of the continuous paper;
A roller support member for rotatably supporting the transport roller;
A holding member that rotatably holds the roller support member;
A cutting member attached to the roller support member and including a cutting blade for cutting the continuous paper;
With
The rotation center of the roller support member is at a position different from the rotation center of the transport roller,
The cutting member is attached to the downstream side of the rotation direction of the roller support member in the transport direction and opposite to the rotation center of the transport roller across the rotation center of the roller support member . ,
A conveyance roller holding mechanism. The holding member is a shaft fixed to a housing;
The roller support member includes a roller bearing that rotatably supports the transport roller, and a through hole that penetrates the shaft.
The transport roller is supported by the roller support member via the roller bearing,
The shaft is passed through the through hole, and the roller support member is rotatably held with the shaft as a rotation axis.
The conveyance roller holding mechanism according to claim 1. When the contact surface of the transport roller with the continuous paper is pushed in a direction perpendicular to the paper surface of the continuous paper according to the tension applied to the continuous paper, the transport roller and the roller The support member is integrated and rotates around the shaft as a rotation center.
The conveyance roller holding mechanism according to claim 2. An elastic member connected to the roller support member;
The roller support member is coupled to the housing via the elastic member, and the elastic member is a continuous paper in which a force due to an elastic force of the elastic member is applied to the contact surface of the transport roller. Connected to the roller support member so as to act in a direction against a force pushed in a direction perpendicular to the paper surface of
The conveyance roller holding mechanism according to claim 3. An elastic member holding portion that holds the elastic member by changing an extension amount;
The transport roller holding mechanism according to claim 4. The first end of the elastic member is connected to the downstream side in the transport direction with respect to the through hole in the roller support member, and the second end of the elastic member is connected to the central axis of the shaft and the transport roller. across the line connecting the center axis of the rotary shaft, the contact surface between the continuous paper in the transport roller is coupled to the housing at the opposite side,
The conveyance roller holding mechanism according to claim 4 or 5, A protective member configured separately from the roller support member;
The cutting blade is located at a position lower than the upper end portion of the protection member when the roller support member is not rotating, and is rotated by a force with which the roller support member is pushed in a direction perpendicular to the paper surface of the continuous paper. When doing, it is movable to a position higher than the upper end portion of the protective member,
The conveyance roller holding mechanism according to any one of claims 1 to 6, The cutting member is detachably attached to the roller support member.
The conveyance roller holding mechanism according to any one of claims 1 to 7, The cutting blade has a length along the width direction of the continuous paper orthogonal to the transport direction, and the tip is a sawtooth wave shape.
The transport roller holding mechanism according to any one of claims 1 to 8, A conveyance roller holding mechanism according to any one of claims 1 to 9,
A liquid adhesion portion for adhering a treatment liquid to the continuous paper;
A drying unit for drying the continuous paper after applying the treatment liquid,
The drying unit includes the transport roller,
The transport roller is held by the transport roller holding mechanism.
A continuous paper drying device. A continuous drying apparatus according to claim 10;
An image forming apparatus that forms an image on the continuous paper after the treatment liquid is attached,
A printing system characterized by that.