Roller attachment / detachment device and belt conveying device

Abstract

To facilitate detaching / attaching of a roller with a simple configuration.SOLUTION: A roller detaching / attaching device for attaching / detaching at least one roller 44 as a detachable roller in a belt-conveying device where an endless belt is hung to a plurality of rollers arranged between a front face plate and a rear face plate from a front side of the front face plate comprises: a guide member 60 provided with a guide groove 61 extending in a longitudinal direction of the detachable roller 44, the guide member 60 being arranged along the detachable roller 44; and a roller holder 50 that holds the detachable roller 44 and includes an engagement part which engages with the front face plate and the rear face plate in an attachable / detachable manner, and a slidable guided part 53 along the guide groove 61 of the guide member 60. The engagement part of the roller holder 50 is engaged with or disengaged from the front face plate and the rear face plate of the roller holder 50 by sliding the guided part 53 of the roller holder 50 onto a deep or front side along the guide groove 61 of the guide member 60.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a roller attaching / detaching device and a belt conveying device, and particularly to a roller attaching / detaching device and a belt conveying device in which the attachment / detachment of a roller supporting a belt is facilitated by a guide member.

Background Art

[0002] In recent years, in response to the demand for small-lot production of a variety of printed materials, electrophotographic and inkjet methods are becoming widespread even in large printing machines and the like. Generally, a large printing machine has a large belt conveying device for conveying printed materials. The belt used in the large belt conveying device is removed from the device when the time for periodic replacement and cleaning arrives.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In order to replace the belt, it is necessary to remove a roller or the like that supports the belt. However, since the roller is heavy, a dedicated jig is required, and the attachment / detachment work requires a considerable amount of man-hours. As a technology for facilitating the replacement of the belt, for example, an invention such as Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-151697) has also been proposed. However, this invention requires a large-scale facility for lifting the entire heavy belt unit.

[0004] The present invention has been made in view of such a situation, and an object thereof is to facilitate the attachment / detachment of a roller with a simple configuration.

Means for Solving the Problems

[0005] To solve the aforementioned problems, the present invention provides a roller attachment / detachment device for a belt conveying device in which an endless belt is wrapped around a plurality of rollers disposed between a front plate and a rear plate, wherein at least one of the rollers is made a removable roller and is attached / detached from the front side where the front plate is located, the device comprising: a guide member disposed along the removable roller, the guide member having a base end supported by the rear plate located at the rear and extending towards the front, and having a guide groove extending in the longitudinal direction of the removable roller; and a roller holder for holding the removable roller, the roller holder having an engaging portion that detachably engages with the front plate and the rear plate, and a guided portion that is slidable along the guide groove of the guide member, wherein the engaged portion of the roller holder engages with or disengages from the front plate and the rear plate by sliding the guided portion of the roller holder towards the rear or front side along the guide groove of the guide member. [Effects of the Invention]

[0006] According to the present invention, the attachment and detachment of rollers can be made easier with a simple configuration. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram showing the general configuration of an image forming apparatus equipped with a belt conveying device. [Figure 2] This is a schematic diagram of an inkjet recording device equipped with a belt conveyor. [Figure 3] This is a side view of the head module of an inkjet recording device. [Figure 4A] This is a perspective view of a belt conveying device that transports and cools paper. [Figure 4B] This is a perspective view of a belt conveying device that transports and cools paper. [Figure 4C] (a) is a perspective view and (b) is a front view showing the lower belt conveying device. [Figure 5A] (a) Front view, (b) Left side view, and (c) Right side view of the lower belt conveying device. [Figure 5B] (a) Front view, (b) Left side view, and (c) Right side view of the lower belt conveying device. [Figure 6A] This is a perspective view of the tension roller and roller holder. [Figure 6B] This is a perspective view of the guide member of a roller attachment / detachment device. [Figure 7] This is a perspective view showing the steps involved in attaching the roller holder along the guide member. [Figure 8] (a) Before and (b) After the rear positioning pin of the roller holder is engaged with the rear plate. [Figure 9] This is a perspective view of a modified embodiment in which an auxiliary guide is provided parallel to the guide member. [Figure 10] This is a perspective view of a belt conveying device in which rollers other than the removable rollers are tension rollers. [Figure 11] This is a diagram showing a modified example of a guide member. [Figure 12] This is a perspective view showing the support structure of the lower belt conveying device. [Figure 13] This is a cross-sectional view showing how to remove the support column member of the lower belt conveying device. [Modes for carrying out the invention]

[0008] (●Overall explanation of the image forming apparatus) Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic diagram showing the general configuration of an image forming apparatus 103 equipped with a belt conveying device.

[0009] The image forming apparatus 103 is, for example, an inkjet-type image forming apparatus. The image forming apparatus 103 mainly consists of a paper feeding section 401, an image forming section 306, a drying section 402, and a paper discharge section 403.

[0010] In the image forming apparatus 103, an image is formed on a sheet P, which is a recording material fed from the paper feed unit 401, by ink, which is a liquid for image formation, in the image forming unit 306. Then, after the ink adhering to the sheet is dried in the drying unit 402, the sheet is discharged from the paper discharge unit 403.

[0011] (●Paper feed unit) The paper feed unit 401 mainly includes a paper feed tray 411 on which a plurality of sheets P are stacked, a paper feed device 412 that separates and feeds out the sheets from the paper feed tray 411 one by one, and a registration roller pair 413 that feeds the sheets into the image forming unit 306. Any paper feed device, such as a device using rollers or cylinders or a device using air suction, can be used as the paper feed device 412.

[0012] The sheet P fed out from the paper feed tray 411 by the paper feed device 412 is fed into the image forming unit 306 when the registration roller pair 413 is driven at a predetermined timing after the leading edge of the sheet reaches the registration roller pair 413. In this embodiment, the paper feed unit 401 is not limited in its configuration as long as it can feed the sheet P into the image forming unit 306.

[0013] (●Image forming unit) The image forming unit 306 mainly includes a receiving cylinder 361 that receives the fed sheet P, a sheet carrying drum 362 that carries and conveys the sheet P conveyed by the receiving cylinder 361 on its outer peripheral surface, an ink ejection unit 364 that ejects ink toward the sheet P carried on the sheet carrying drum 362, and a delivery cylinder 365 that delivers the sheet P conveyed by the sheet carrying drum 362 to the drying unit 402.

[0014] The leading edge of the sheet P conveyed from the paper feed unit 401 to the image forming unit 306 is gripped by a sheet gripper provided on the surface of the receiving cylinder 361 and conveyed along with the surface movement of the receiving cylinder 361. The sheet conveyed by the receiving cylinder 361 is delivered to the sheet carrying drum 362 at the opposing position to the sheet carrying drum 362.

[0015] A paper gripper is also provided on the surface of the paper-carrying drum 362, and the leading edge of the paper is gripped by the paper gripper. Multiple suction holes are dispersed on the surface of the paper-carrying drum 362.

[0016] A suction airflow directed towards the inside of the paper-carrying drum 362 is generated at each suction hole by the suction device 363. The paper P, transferred from the receiving cylinder 361 to the paper-carrying drum 362, is gripped at the tip by the paper gripper and is attracted to the surface of the paper-carrying drum 362 by the suction airflow, and is conveyed as the surface of the paper-carrying drum 362 moves.

[0017] The ink ejection unit 364 of this embodiment ejects four colors of ink: C (cyan), M (magenta), Y (yellow), and K (black) to form an image. The ink ejection unit 364 is equipped with individual liquid ejection heads 364C, 364M, 364Y, and 364K for each ink.

[0018] The liquid ejection heads 364C, 364M, 364Y, and 364K are not limited in their configuration as long as they eject liquid; any configuration can be used. If necessary, liquid ejection heads that eject special inks such as white, gold, or silver may be provided, or liquid ejection heads that eject liquids that do not form an image, such as surface coating liquids, may be provided.

[0019] The liquid ejection heads 364C, 364M, 364Y, and 364K of the ink ejection unit 364 are controlled by drive signals corresponding to image information. When the paper P supported on the paper-carrying drum 362 passes through the area opposite the ink ejection unit 364, ink of each color is ejected from the liquid ejection heads 364C, 364M, 364Y, and 364K, and an image corresponding to the image information is formed. In this embodiment, the image forming unit 306 is not limited in its configuration as long as it forms an image by adhering liquid to the paper P.

[0020] (Drying section) The drying section 402 mainly consists of a drying mechanism 421 for drying the ink that has adhered to the paper P in the image forming section 306, and a transport mechanism 422 for transporting the paper P that has been transported from the image forming section 306 using a belt transport device. The paper P that has been transported from the image forming section 306 is received by the transport mechanism 422, then transported through the drying mechanism 421, and handed over to the paper discharge section 403. As the paper passes through the drying mechanism 421, the ink on the paper P is subjected to a drying process, which causes the water and other liquid components in the ink to evaporate, the ink to solidify on the paper P, and the curling of the paper P is suppressed.

[0021] (● Paper output section) The paper discharge unit 403 mainly consists of a paper discharge tray 431 on which multiple sheets of paper P are stacked. The sheets of paper P transported from the drying unit 402 are sequentially stacked and held on the paper discharge tray 431. In this embodiment, there are no restrictions on the configuration of the paper discharge unit 403, as long as it discharges the sheets of paper P.

[0022] (●Image forming unit and other functional units) The image forming apparatus 103 of this embodiment consists of a paper feeding unit 401, an image forming unit 306, a drying unit 402, and a paper discharge unit 403. It is also possible to add other functional units to the image forming apparatus 103 as appropriate. For example, a pre-processing unit for performing pre-processing of image formation can be added between the paper feeding unit 401 and the image forming unit 306, or a post-processing unit for performing post-processing of image formation can be added between the drying unit 402 and the paper discharge unit 403.

[0023] Examples of pre-processing steps include applying a processing solution to the paper P to suppress bleeding by reacting with the ink, but there are no particular restrictions on the content of the pre-processing steps. Examples of post-processing steps include a paper inversion and transport process to invert the paper on which an image has been formed in the image forming unit 306 and send it back to the image forming unit 306 to form an image on both sides of the paper, a process to bind multiple sheets of paper on which images have been formed, or a correction mechanism to correct paper deformation or a cooling mechanism to cool the paper, but there are no particular restrictions on the content of the post-processing steps.

[0024] (● Inkjet recording device) Figure 2 is a schematic diagram showing the overall configuration of an on-demand line-scanning inkjet recording device equipped with a belt conveyor. The inkjet recording device comprises an image forming unit 210, a paper feeding unit 220, a resist adjustment unit 230, a drying unit 240, a recording medium inversion unit 250, and a paper discharge unit 290.

[0025] To illustrate one example of the printing process, first, the paper sheets P loaded onto the paper feed stack 221 of the paper feed unit 220 are picked up one by one by the air separation unit 222 and transported toward the image forming unit 210 (X direction). When the paper sheets P transported from the paper feed unit 220 reach the resist adjustment unit 230, the resist adjustment unit 230 corrects the tilt of the paper sheets P using a pair of resist rollers 231 located inside.

[0026] The resist-adjusted paper P is fed to the image forming unit 210 by the feed roller 211. Then, the drum 10 rotates with the leading edge of the paper P held in place by the paper gripper 11 provided on the surface of the cylindrical drum 10, thereby transporting the paper P to a position facing the head modules 28K~28P of the ink ejection unit 28.

[0027] In the image forming unit 210, head modules 28K to 28P, which are recording head units that eject ink using an inkjet method, are arranged radially at an angle along the surface of the cylindrical drum 10, each filled with a predetermined ink color. Multiple head modules 28K to 28P eject ink (liquid) from the outside of the circumference onto the outer surface of the paper P held on the surface of the drum 10, thereby forming an image on the paper P.

[0028] An empty ejection receiver 12 is provided on the outer surface of the cylindrical drum 10, and receives ink ejected as empty ejection when the head modules 28K~28P are not ejecting ink onto the paper P. Once an image is formed, the paper P is sent to the drying unit 240.

[0029] A drying unit 241 is installed in the drying section 240, and the paper P passes beneath it, causing the moisture in the paper P to evaporate. A belt conveying device for transporting the paper P is installed below the drying unit 241.

[0030] Furthermore, the drying section 240 is equipped with a paper reversal section 250, which includes a paper reversal mechanism 251, and the paper P is reversed here during double-sided printing. The reversed paper P is then transported again towards the image forming section 210 by the reversal transport section 252. The paper reversal mechanism 251 is also equipped with a belt transport device.

[0031] Before the paper P reaches the drum 10, the tilt of the paper P is corrected by a registration roller 253 located inside the image forming unit 210. After drying in the drying unit 240, the paper P is transported to the paper discharge unit 290, where it is loaded with its rear end aligned.

[0032] Figure 3 is a side view showing an example of an embodiment of the inkjet recording head module 8. The inkjet recording module 8 mainly consists of a drive control board 17, an inkjet recording head 15, and a cable 16.

[0033] The drive control board 17 is equipped with a drive control unit 26, a drive waveform generation unit 27, and a storage means 18. Cable 16 has a drive control board connector 19 and a head-side connector 20 attached to it, and is responsible for the communication of analog and digital signals between the drive control board 17 and the head board 22 mounted on the recording head 15.

[0034] The recording head 15 mainly consists of a residual vibration detection module 21, a head board 22, a head drive IC board 24, an in-head ink tank 23, and a rigid plate 25. In a line scanning inkjet recording device, the recording head 15 is arranged in a line head configuration in the paper depth direction (or forward direction) perpendicular to the paper transport direction P.

[0035] It is also possible to configure a serial scanning printer or other droplet ejection device, etc., in which one or more recording heads 15 move in the paper depth direction (or towards the front) perpendicular to the paper transport direction of the paper P, while further transporting the paper P in the transport direction to form an image.

[0036] (● Belt conveying device) Figure 4A is a perspective view of a belt conveying device according to an embodiment of the present invention. This belt conveying device has an upper conveying device 30 and a lower conveying device 40. Paper, which is the object to be conveyed, can be placed between the upper conveying device 30 and the lower conveying device 40 and conveyed.

[0037] The rear side (back of the page) of the lower conveying device 40 is supported by the rear part 73 of the housing of the belt conveying device shown in Figure 4C. The rear side (back of the page) of the upper conveying device 30 is fixed to the rear panel 90 that supports the rear side of the lower conveying device 40. The front side (front of the page) of the lower conveying device 40 is supported by the front panel 80 shown in Figure 4C.

[0038] The front panel 80 can be supported by the front portion 74 of the housing via the holding member 76 shown in Figure 4C. Another support structure for the front panel 80 is a structure using a pair of left and right support members 70, which will be described later in Figure 12. The front side (front side of the paper) of the upper transport device 30 can be supported by another front panel positioned above the front panel 80.

[0039] The upper conveying device 30 has an upper belt 31 which is an endless belt. The upper belt 31 is supported by being stretched across a plurality of rollers 32 to 37. The roller 33 on the right is the inlet side, and the roller 32 on the left is the outlet side.

[0040] Compression springs 38, acting as biasing members, are connected to both ends of roller 35, which is located between rollers 34 and 36. By biasing roller 35 to the left with these compression springs 38, tension (belt tension) is applied to the upper belt 31. Roller 35 is a removable roller for replacement and inspection of the upper belt 31.

[0041] The lower conveying device 40 has a lower belt 41 which is an endless belt. The lower belt 41 is supported by being stretched across a plurality of rollers 42, 43, 44, and 45. The roller 45 on the right is the inlet side, and the roller 42 on the left is the outlet side.

[0042] Compression springs 46, acting as biasing members, are connected to both ends of roller 44, which is located between rollers 43 and 45. By biasing roller 44 to the left with these compression springs 46, tension (belt tension) is applied to the lower belt 41. Roller 44 is a removable roller for replacement and inspection of the lower belt 41.

[0043] The roller 44 that applies tension to the lower belt 41 is held in a roller holder 50. Details of the roller holder 50 will be described later in Figures 5A and 5B.

[0044] When replacing or inspecting the lower belt 41 of the lower conveying device 40, it is necessary to remove the roller 44 that applies tension to the lower belt 41. The removal of the roller 44 is performed from the front panel 80 side, which is located at the front of the device as shown in Figure 4C.

[0045] Conventionally, the roller 44 located below the upper conveying device 30 was not easily accessible from the front panel 80 side because the upper conveying device 30 was in the way. Therefore, it was necessary to remove parts that did not normally need to be removed in order to make access from the front panel 80 side possible.

[0046] Therefore, in this embodiment, a guide member 60 is provided as shown in Figure 4B. By sliding the roller holder 50 in the front-rear direction along the guide groove 61 of this guide member 60, it is possible to easily attach and detach the roller holder 50 to the front plate 80 and the rear plate 90.

[0047] (●Roller holder) The roller holder 50 has a base 51 that extends parallel to the roller 44, as shown in detail in Figure 5A. Both ends of the base 51, namely the rear end and the front end, form L-shaped side plates 54 and 56 perpendicular to the base 51.

[0048] A pair of positioning pins 52 are provided protruding from the outer surface of the rear side plate 54, extending in the axial direction of the roller 44. This pair of positioning pins 52 are designed to fit into a pair of positioning holes 91 in the rear plate 90.

[0049] On the other hand, a pair of positioning protrusions 56c are formed on the inner surface of the front side plate 56. This pair of positioning protrusions 56c are designed to fit into a pair of positioning holes 81 in the front plate 80. One of the positioning holes 81 in the front plate 80 is elongated horizontally to facilitate the fitting of the protrusions 56c.

[0050] A pair of support plates 57 are erected on the base 51 to support the bearing 58 of the roller 44 so that it can move up and down. The shaft of the roller 44 is rotatably supported by the bearing 58. The bearing 58 is biased upward by a compression spring 46 in Figure 5A.

[0051] A guided portion 53 is provided on the side surface of the base 51 near the positioning pin 52. This guided portion 53 has a flange portion 53a and a shaft portion 53b. The shaft portion 53b is fixed to the side surface of the base 51 perpendicular to the biasing direction of the compression spring 46. The center of the flange portion 53a is fixed to the tip of the shaft portion 53b.

[0052] A stopper portion 55 is provided protruding from the lower surface of the base 51 near the guided portion 53. As will be described later in Figure 9, this stopper portion 55 stabilizes the posture of the roller holder 50 by sliding along the auxiliary guide 69.

[0053] Figure 5B shows a modified engagement structure of the roller holder 50 with respect to the front plate 80. Specifically, in Figure 5B, a pair of positioning holes 56a and 56b are formed in the front side plate 56.

[0054] A pair of positioning pins 82 on the front plate 80 are fitted into this pair of positioning holes 56a and 56b. One of the positioning holes 56b is formed to be elongated horizontally to facilitate the fitting of the positioning pin 82. The rest is the same as in Figure 5A.

[0055] (● Guided part) The removable roller 44 is supported by the roller holder 50 via a pair of compression springs 46, as shown in Figure 6A. A positioning pin 52 and a guided portion 53 are provided at the rear end of the roller holder 50.

[0056] The roller holder 50 can be pulled out towards the front of the device while holding the roller 44, as shown in Figure 4B. The guide member 60 shown in Figure 6B is useful when pulling out the roller holder 50.

[0057] (● Guide component) The guide member 60 is formed from sheet metal in a strip shape and is arranged along the longitudinal direction of the roller 44. The base end (rear end) of the guide member 60 is fixed to the rear plate 90 in Figure 4C, and the tip (front end) extends toward the front plate 80 in Figure 4C. This guide member 60 is the main component of the roller attachment / detachment device in this embodiment. The guide member 60 can also be used for attaching and detaching rollers in the belt conveying devices shown in Figures 1 and 2.

[0058] The guide member 60 extends horizontally from the rear plate 90 toward the front plate 80, but it is preferable to position it with a downward slope to the right when viewed from the front. The magnitude (angle) of the downward slope to the right is determined by the mounting position of the roller holder 50 relative to the front plate 80 and the rear plate 90.

[0059] When the roller holder 50 is installed so that the roller 44 is biased almost vertically upward as shown in Figures 4A and 4B, the guide member 60 can be positioned almost vertically when viewed from the front. On the other hand, when the roller holder 50 is installed so that the roller 44 is biased almost horizontally upward to the left as shown in Figures 4A and 4B, the guide member 60 can be positioned with a downward slope of about 10 to 30 degrees to the right when viewed from the front.

[0060] By arranging it with a downward slope to the right in this way, the shaft portion 53b of the guided portion 53 can be guided along one side edge of the guide groove 61. In other words, when inserting or removing the roller holder 50, it is possible to prevent the shaft portion 53b of the guided portion 53 from rattling inside the guide groove 61.

[0061] A guide groove 61 is formed in the guide member 60, extending from the base end to the tip end. This guide groove 61 guides the guided portion 53 when the roller holder 50 is pulled out towards the front of the device.

[0062] The guide groove 61 is formed along the longitudinal direction of the roller 44, but it is not a single straight line as a whole, but has straight sections 63 and 67 and an inclined section 65, as will be described later. In other words, the guide groove 61 functions as a type of cam groove.

[0063] An access hole 62 is formed at the front end of the guide groove 61. This access hole 62 is formed off-center, on the opposite side from the one edge of the guide groove 61 that guides the shaft portion 53b of the guided portion 53.

[0064] The entry / exit hole 62 is formed to be wider than the groove width of the guide groove 61, and is configured to allow the flange portion 53a of the guided portion 53 to be inserted into and removed from one side of the guide member 60 through the entry / exit hole 62. The shape of the entry / exit hole 62 does not matter as long as it allows the flange portion 53a to be inserted and removed, and can be circular, rectangular, or any other shape.

[0065] Following the entrance / exit hole 62, a first straight section 63, a first bent section 64, an inclined section 65, a second bent section 66, and a second straight section 67 are formed. The first straight section 63 may be parallel to the axial direction of the roller 44 in Figure 4B. The first straight section 63 can be formed to be, for example, about 80% of the total length of the guide groove 61.

[0066] However, the length ratio (%) of the first straight section 63 can be increased or decreased in accordance with the length of the positioning pin 52, which will be described later. If the length of the positioning pin 52 is increased, the length ratio (%) of the second straight section 67 must be increased, so the length ratio (%) of the first straight section 63 will decrease. Conversely, if the length of the positioning pin 52 is shortened, the length ratio (%) of the second straight section 67 can be reduced, so the length ratio (%) of the first straight section 63 will increase.

[0067] The first bend 64 is the section where the first straight section 63 changes to an inclined section 65. Once the shaft 53b of the guided section 53 passes this first bend 64, the inclined section 65 guides the roller holder 50 in the direction that compresses the compression spring 46.

[0068] The second bend 66 is the section where the inclined section 65 changes to the second straight section 67. Once the shaft portion 53b of the guided section 53 passes this second bend 66, it ceases to compress the compression spring 46 further and guides the roller holder 50 in the direction of inserting the positioning pin 52 into the positioning hole 91 of the rear plate 90.

[0069] (● How to attach the roller) When installing the roller holder 50 from the front side of the device (the side of the front panel 80 in Figure 4C), as shown in Figure 7(a), first, while holding the roller holder 50 horizontally with your hand, insert the guided portion 53 at its rear end into the insertion / exit hole 62 from below. The insertion / exit hole 62 is large enough for the flange portion 53a of the guided portion 53 to pass through, so it can be inserted easily.

[0070] Once the guided portion 53 is inserted into the insertion / removal hole 62, the hand supporting the rear side of the roller holder 50 can be released. That is, when the hand supporting the rear side of the roller holder 50 is released, the shaft portion 53b of the guided portion 53 moves to one side edge (right edge) of the guide groove 61 due to the weight of the roller 44 and the roller holder 50.

[0071] In this state, the flange portion 53a of the guided portion 53 can no longer be removed from the guide groove 61. Therefore, the operator can safely release their hand from the far side of the roller holder 50.

[0072] Next, as shown in Figure 7(b), while supporting the front side of the roller holder 50 with your hand, push the roller holder 50 toward the back. As a result, the shaft portion 53b of the guided portion 53 is guided by the first straight portion 63 of the guide groove 61 and moves toward the back.

[0073] As the shaft portion 53b of the guided portion 53 moves inward along the inclined portion 65 as shown in Figure 7(c), the rear side of the roller holder 50 also moves in the same way as the inclined portion 65, and the compression spring 46 is compressed at the same time. When the shaft portion 53b of the guided portion 53 reaches the second bent portion 66, further compression of the compression spring 46 stops, and at the same time, as shown in Figure 8(a), the extension of the axis of the positioning pin 52 enters the inside of the positioning hole 91.

[0074] As the shaft portion 53b of the guided portion 53 moves the second straight portion 67 toward the rear, the positioning pin 52 engages with the positioning hole 91 of the rear plate 90, as shown in Figure 8. This completes the positioning of the rear end of the roller holder 50.

[0075] Simultaneously, in Figure 5A, the positioning projection 56c on the front side of the roller holder 50 fits into the positioning hole 81 of the front plate 80. Also, in Figure 5B, the positioning pins 82 of the front plate 80 fit into the positioning holes 56a and 56b on the front side of the roller holder 50.

[0076] In this way, positioning is performed at two points each on the front and rear sides of the roller holder 50, allowing the roller holder 50 and roller 44 to be accurately positioned without any wobbling. Moreover, since the only components used are the guide member 60 and the pins of the guided portion 53, it is low-cost and space-saving.

[0077] (●Engagement of the roller holder with the rear plate) When the positioning pin 52 is fitted into the positioning hole 91 of the rear plate 90 as shown in Figure 8, a tapered tip 52a is formed on the tip of the positioning pin 52, which allows for smooth fitting into the positioning hole 91. The final position of the innermost part of the roller holder 50 is restricted when the shaft portion 53b of the guided portion 53 abuts against the end portion 67a of the second straight portion 67. Therefore, the axial positioning of the roller holder 50 and the roller 44 can be accurately performed.

[0078] (●Experimental variation 1) Figure 9 shows a modified example for stabilizing the support of the roller holder 50. In the embodiment described above, the weight of the rear side of the roller holder 50 is supported only by the flange portion 53a of the guided portion 53.

[0079] Therefore, as shown in Figure 7, the stability of the roller holder 50 in the left-right rotational direction when it is moved in the front-rear direction is poor. If the roller holder 50 wobbles when it is moved in the front-rear direction, there is a possibility that the roller holder 50 may come into contact with other surrounding parts.

[0080] Therefore, in this modified example, a plate-shaped abutment portion 55 is provided on the lower surface of the base 51 at the rear end of the roller holder 50. This abutment portion 55 protrudes on the opposite side from the compression spring 46.

[0081] On the other hand, a plate-shaped auxiliary guide 69 is provided on the lower side of the guide member 60. Like the guide member 60, the base end of this auxiliary guide 69 is fixed to the rear plate 90, and the tip extends toward the front plate 80.

[0082] The front side 69a of the auxiliary guide 69 has a plane parallel to the first straight portion 63 of the guide groove 61 of the guide member 60. The rear side 69b of the auxiliary guide 69 has a plane parallel to the inclined portion 65 of the guide groove 61 of the guide member 60.

[0083] As shown in Figure 9, with the abutment portion 55 in contact with the auxiliary guide 69, the flange portion 53a of the guided portion 53 is inserted from below into the front end (inlet / outlet hole 62) of the guide groove 61. The auxiliary guide 69 determines the left-right position of the flange portion 53a of the guided portion 53, making insertion into the inlet / outlet hole 62 easier.

[0084] From the state shown in Figure 9, the roller holder 50 can be moved in the front-rear direction as shown in Figure 7. In this case, the rotation of the roller holder 50 in the left-right direction is suppressed by the auxiliary guide 69, so the possibility of the roller holder 50 or roller 44 coming into contact with other surrounding parts can be reduced.

[0085] (●Differentiation Example 2) Figure 10 shows a roller 43 located below the roller 44, to which a compression spring 48, a biasing member that applies tension to the lower belt 41, is attached. In this case, the roller 44 held by the roller holder 50 does not require the compression spring 46 shown in Figures 5A and 5B.

[0086] In other words, the bearing 58 of the roller 44 can be fixedly positioned on the support plate 57. As a result, when the roller holder 50 is moved in the front-rear direction as shown in Figure 7, the roller 44 does not swing unstably. Therefore, the possibility of the roller 44 coming into contact with other surrounding parts can be reduced.

[0087] (●Difference 3) Figure 11 shows a modified example of the guide groove 61. In Figure 11(a), the center of the entry / exit hole 62 is aligned with the center of the groove width of the guide groove 61.

[0088] In this case, when the weight of the rear side of the roller holder 50 is transferred to the guide member 60 via the guided portion 53, the shaft portion 53b of the guided portion 53 engages with the lower side of the inlet / outlet hole 62. Therefore, the front-rear position of the roller holder 50 can be restricted by the inlet / outlet hole 62, allowing for stable changes in grip, such as shifting the hand supporting the front side of the roller holder 50.

[0089] Figure 11(b) shows the entry / exit hole 62 with its center shifted upward from the center of the groove width of the guide groove 61. In other words, the entry / exit hole 62 is formed off-center to the opposite side of the lower edge of the guide groove 61, where the shaft portion 53b of the guided portion 53 slides and is guided.

[0090] In this case, when the rear weight of the roller holder 50 is transferred to the guide member 60 via the guided portion 53, the shaft portion 53b of the guided portion 53 is positioned at the front end of the lower edge of the guide groove 61 (first straight portion 63). Therefore, the rearward movement of the roller holder 50 can be smoothly initiated along the first straight portion 63.

[0091] Figure 11(c) shows a guide member 60 with a reinforcing member 68 that reinforces the guide groove 61. Since the guide groove 61 extends in the longitudinal direction of the guide member 60, the guide member 60 may bend when the large weight of the roller holder 50 acts on it. If this occurs, it may become difficult to move the roller holder 50 smoothly in the front-rear direction.

[0092] Therefore, the guide groove 61 was connected on both sides with reinforcing members 68 so as to cover the upper side of the guide groove 61. This improves the load-bearing capacity of the guide member 60 and suppresses the bending of the guide member 60. When this embodiment is applied to a large belt conveying device with long rollers 44, the improved load-bearing capacity provided by the reinforcing members 68 makes it easier to lengthen the guide member 60 (extend the pull-out length).

[0093] (●Differentiation Example 4) Figure 12 shows a modified example of the support structure of the lower conveying device 40. Conventionally, the support structure of the lower conveying device 40 was generally as shown in Figure 4C. In this support structure, when the retaining member 76 is removed in order to remove the roller holder 50, there is no member to support the front plate 80.

[0094] In other words, if the front panel 80 is not held in place by hand, the front panel 80 and the bottom panel 95 will fall onto the support panel 75. Therefore, a temporary support jig is needed to temporarily support the front panel 80 and the bottom panel 95.

[0095] Therefore, in the support structure shown in Figure 12, the lower end of the front plate 80 and the front end of the bottom plate 95 are connected by a pair of left and right support members 70. There can be multiple support members 70, and it is possible to use three or more depending on the weight and size of the lower conveying device 40. In Figure 12, if only the right support member 70 is removed while the left support member 70 is left in place, the roller holder 50 can be attached and detached.

[0096] Figure 13 shows an improved version of Figure 12 for easier attachment and detachment of the support member 70. Specifically, engagement holes 71 and 72 are formed at both the upper and lower ends of the support member 70, and engagement pins 85 and 96 are provided at the lower end of the front plate 80 and the front end of the bottom plate 95, which detachably engage with the engagement holes 71 and 72.

[0097] The engaging pins 85 and 96 can be the same shape, and in Figure 13, they are in a shape in which the shaft portions 85b and 96b are connected to the flange portions 85a and 96a. The base ends of the shaft portions 85b and 96b are fixed to the lower end of the front plate 80 and the front end of the bottom plate 95.

[0098] The centers of the disc-shaped flange portions 85a and 96a are connected to the tip sides of the shaft portions 85b and 96b. The flange portions 85a and 96a have a larger diameter than the shaft portions.

[0099] On the other hand, the engagement holes 71 and 72 at both the upper and lower ends of the support member 70 are so-called keyhole shapes, having a rectangular notch in a circular part. The engagement holes 71 and 72 are formed with their notches facing each other, that is, with their notches facing each other in the vertical direction.

[0100] The circular portions of the engagement holes 71 and 72 are formed to be slightly larger than the flange portions 85a and 96a of the engagement pins 85 and 96. This allows the flange portions 85a and 96a of the engagement pins 85 and 96 to be detached from the circular portions of the engagement holes 71 and 72.

[0101] On the other hand, the notches in the engagement holes 71 and 72 are sized to accommodate the shaft portions 85b and 96b of the engagement pins 85 and 96. Therefore, as shown in Figure 13(a), the shaft portions 85b and 96b of the engagement pins 85 and 96 are normally fitted into the notches in the engagement holes 71 and 72. In this state, the support member 70 cannot be removed, so the flange portions 85a and 96a of the engagement pins 85 and 96 function as safety devices.

[0102] (● Detachment of the engagement pins on the front panel) To remove the roller holder 50, lift the front plate 80 as shown in Figure 13(b). This causes the engagement pin 85 of the front plate 80 to move to the circular portion at the upper end of the engagement hole 72.

[0103] From this state, if the upper end of the support member 70 is tilted towards the front (to the right in Figure 13) as shown in Figure 13(c), the engagement pin 85 can be released from the engagement hole 72 as shown in Figure 13(d). The lower engagement pin 96 can also be released from the engagement hole 71 by slightly lifting the support member 70.

[0104] As the support member 70 can be easily removed in this way, the roller holder 50 can be removed quickly. When replacing the lower belt and installing the roller holder 50, the procedure can be reversed from the above, so the installation of the roller holder 50 can also be done quickly.

[0105] Although the present invention has been specifically described above based on embodiments, it goes without saying that the present invention is not limited to the above embodiments and can be modified in various ways within the scope of the technical idea described in the claims. For example, in the above-described embodiments, the roller holder 50 of the roller 44 of the lower conveying device 40 is guided and attached / detached by a guide member 60, but it is also possible to guide and attach / detach the roller holder that holds the tension roller 35 of the upper conveying device 30 by a different guide member. Furthermore, the belt conveying device is not necessarily limited to having a pair of upper and lower conveying devices 30 and 40 as shown in Figures 4A and 4B. The roller attachment / detachment device of the present invention can be used in any belt conveying device in which an endless belt is wrapped around multiple rollers. [Explanation of symbols]

[0106] 10: Drum 11: Paper gripper 15: Inkjet recording head 15: Recording head 15: Recording head 16: Cable 17: Drive control board 18: Memory means 19: Drive control board connector 20: Head side connector 21: Residual vibration detection module 22: Head board 23: Ink tank inside the print head 24: Print head drive IC board 25: Rigid plate 26: Drive control unit 27: Drive waveform generation unit 28: Ink ejection unit 28K~28P: Head module 30: Upper transport device 30: Lower conveying device 31: Upper belt 32-37: Rollers 40: Lower conveying device 41: Lower belt 42-45: Roller 50: Roller holder 51: Base 52: Positioning pin 52a: Taper 53: Guided portion 53a: Flange portion 53b: Shaft 54, 56: Side plate 55: Butt section 56a, 56b: Positioning holes 56c: Positioning protrusion 57: Support plate 58: Bearing 60: Guide member 61: Guide groove 62: Inlet / outlet hole 63: First straight section 64: First bent section 65: Inclined part 66: Second bent part 67: Second straight section 67a: Terminal section 68: Reinforcement member 69: Auxiliary guide 70: Support member 71, 72: Engagement holes 73: Back part 74: Front part 75: Support plate 76: Retaining member 80: Front panel 81: Positioning holes 82: Positioning pin 85, 96: Engaging pins 85a, 96a: Flange section 85b, 96b: Shaft section 90: Rear plate 91: Positioning hole 95: Bottom plate 103: Image forming device 210: Image forming unit 211: Feed roller 220: Paper feed section 221: Paper feed stack 222: Air separation section 230: Resist adjustment section 231: Resist roller vs. 240: Drying section 241: Drying unit 250: Paper reversal unit 251: Paper reversal mechanism 252: Reversal transport unit 253: Register roller 290: Paper output section 306: Image forming unit 361: Receiving cylinder 362: Paper-carrying drum 363: Suction device 364: Ink ejection unit; 364C, 364M, 364Y, 364K: Liquid ejection head 365: Transfer cylinder 401: Paper feed section 402: Drying section 403: Paper discharge section 411: Paper feed tray 412: Paper feeding device 413: Resist roller vs. 421: Drying mechanism 422: Transport mechanism 431: Output tray P:Paper [Prior art documents] [Patent Documents]

[0107] [Patent Document 1] Japanese Patent Publication No. 2006-151697

Claims

1. A roller attachment / detachment device for a belt conveying device in which an endless belt is wrapped around a plurality of rollers disposed between a front plate and a rear plate, wherein at least one of the rollers is a removable roller and is attached and detached from the front side where the front plate is located, A guide member disposed along the removable roller, the guide member having a base end supported by the rear plate located at the rear and extending towards the front, and having a guide groove extending in the longitudinal direction of the removable roller, A roller holder for holding the removable roller, the roller holder having a first engaging portion that detachably engages with the front plate, a second engaging portion that detachably engages with the rear plate, and a guided portion that is slidable along the guide groove of the guide member, A roller attachment / detachment device is provided, wherein the guided portion of the roller holder is slid toward the rear or front along the guide groove of the guide member, thereby causing the first engaging portion and the second engaging portion of the roller holder to engage with or disengage from the front plate and the rear plate, A roller attachment / detachment device characterized in that an inclined portion is formed at the inner end of the guide groove, which allows the roller holder and the removable roller to move in the tensioning direction of the endless belt.

2. The roller attachment / detachment device according to claim 1, characterized in that a biasing member for applying tension to the endless belt is disposed between the removable roller and the roller holder.

3. A roller attachment / detachment device for a belt conveying device in which an endless belt is wrapped around a plurality of rollers disposed between a front plate and a rear plate, wherein at least one of the rollers is a removable roller and is attached and detached from the front side where the front plate is located, A guide member disposed along the removable roller, the guide member having a base end supported by the rear plate located at the rear and extending towards the front, and having a guide groove extending in the longitudinal direction of the removable roller, A roller holder for holding the removable roller, the roller holder having a first engaging portion that detachably engages with the front plate, a second engaging portion that detachably engages with the rear plate, and a guided portion that is slidable along the guide groove of the guide member, A roller attachment / detachment device is provided, wherein the guided portion of the roller holder is slid toward the rear or front along the guide groove of the guide member, thereby causing the first engaging portion and the second engaging portion of the roller holder to engage with or disengage from the front plate and the rear plate, A roller attachment / detachment device characterized in that the guided portion has a shaft portion that can slide along the guide groove and a flange portion at the tip of the shaft portion that is larger than the groove width of the guide groove.

4. The roller attachment device according to claim 3, characterized in that the base end of the guide member is mounted at an inclination with respect to the rear plate such that the shaft portion of the guided portion slides along one side edge of the guide groove.

5. The roller attachment device of claim 4, characterized in that an insertion / removal hole is formed at the front end of the guide groove for inserting and removing the flange portion of the guided portion into and out of the guide groove, and the flange portion can be inserted and removed from one side to the other side of the guide member through the insertion / removal hole.

6. The roller attachment / detachment device according to claim 5, characterized in that the entry / exit holes are located on the side opposite to the one-sided edge of the guide groove in the width direction of the guide groove.

7. A roller attachment / detachment device according to any one of claims 3 to 6, characterized in that a pair of positioning pins, which serve as the second engaging portion, are provided at the rear end of the roller holder and can be fitted into a pair of rear positioning holes formed in the rear plate.

8. A roller attachment / detachment device according to any one of claims 3 to 7, characterized in that a pair of positioning protrusions, which serve as the first engaging portion, are formed at the front end of the roller holder and can be fitted into a pair of front positioning holes formed in the front plate.

9. A roller attachment / detachment device for a belt conveying device in which an endless belt is wrapped around a plurality of rollers disposed between a front plate and a rear plate, wherein at least one of the rollers is a removable roller and is attached and detached from the front side where the front plate is located, A guide member disposed along the removable roller, the guide member having a base end supported by the rear plate located at the rear and extending towards the front, and having a guide groove extending in the longitudinal direction of the removable roller, A roller holder for holding the removable roller, the roller holder having a first engaging portion that detachably engages with the front plate, a second engaging portion that detachably engages with the rear plate, and a guided portion that is slidable along the guide groove of the guide member, A roller attachment / detachment device is provided, wherein the guided portion of the roller holder is slid toward the rear or front along the guide groove of the guide member, thereby causing the first engaging portion and the second engaging portion of the roller holder to engage with or disengage from the front plate and the rear plate, A roller attachment / detachment device characterized by providing a stopper portion at the rear end of the roller holder, and providing an auxiliary guide along the guide groove of the guide member, thereby allowing the stopper portion to slide along the auxiliary guide when the guided portion of the roller holder slides along the guide groove of the guide member.

10. A roller attachment / detachment device for a belt conveying device in which an endless belt is wrapped around a plurality of rollers disposed between a front plate and a rear plate, wherein at least one of the rollers is a removable roller and is attached and detached from the front side where the front plate is located, A guide member disposed along the removable roller, the guide member having a base end supported by the rear plate located at the rear and extending towards the front, and having a guide groove extending in the longitudinal direction of the removable roller, A roller holder for holding the removable roller, the roller holder having a first engaging portion that detachably engages with the front plate, a second engaging portion that detachably engages with the rear plate, and a guided portion that is slidable along the guide groove of the guide member, A belt conveying device having a roller attachment / detachment device which causes the guided portion of the roller holder to slide inward or forward along the guide groove of the guide member, thereby causing the first engaging portion and the second engaging portion of the roller holder to engage with or disengage from the front plate and the rear plate, wherein the rear plate is disposed on the back of the housing of the belt conveying device, the bottom plate located below the belt conveying device is connected to the rear plate, and the front end of the bottom plate is connected to the front plate via a plurality of detachable support members.

11. The belt conveying device of 10, characterized in that engagement pins disposed at the lower end of the front plate and the front end of the bottom plate are engaged with engagement holes formed at both the upper and lower ends of the support member.

12. The belt conveying device according to claim 11, characterized in that the engagement pin can be detached from the upper end of the engagement hole formed in the upper end of the support member.

13. The belt conveying device according to any one of claims 10 to 12, characterized in that the belt conveying device is composed of an upper and lower pair, and the object to be conveyed is conveyed by sandwiching it between the upper and lower pair of belt conveying devices.

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