JP6627453B2 - Device for conveying sheet material, device for discharging liquid - Google Patents

Description

  The present invention relates to an apparatus for conveying a sheet material and an apparatus for discharging a liquid.

  For example, in an apparatus using a sheet material such as an image forming apparatus, it is necessary to prevent the sheet material from rising when the sheet material is conveyed.

  In view of this, conventionally, there has been known an apparatus having a conveyance guide member for guiding the conveyance of a sheet material and a holding means for pressing the sheet material toward the conveyance guide member on the upstream side of the recording head (Patent Documents 1 to 3). .

JP 2014-166743 A JP 2014-88018 A Patent No. 5089203 Public Law

  By the way, in the configuration for holding the sheet material as described above, since the pressing force of the holding means is constant, the transport load of the sheet material increases as the thickness of the sheet material increases, and the transportability decreases. There is a problem that.

  The present invention has been made in view of the above problems, and has as its object to enable stable conveyance.

In order to solve the above problems, an apparatus for conveying a sheet material according to the present invention includes:
A conveyance guide member for guiding conveyance of the sheet material,
Holding means for pressing the sheet material toward the conveyance guide member side,
The transport guide member has at least two ribs that are disposed apart from each other in a direction orthogonal to the sheet material transport direction and extend in the sheet material transport direction, and support the sheet material.
The pressing means has a plurality of driven rotating body that rotates in accordance with movement of the sheet material in contact with the sheet material,
The driven rotator is rotatably held by a holding member via an elastic member, and is disposed between the two ribs of the conveyance guide member on the upstream side in the sheet material conveyance direction,
The driven rotating body is disposed at a position where the lowermost part is lower than the top of the rib,
The pressing force of the elastic member is different depending on the position of the driven rotating body in a direction orthogonal to the sheet material conveyance direction,
In the direction orthogonal to the sheet material transport direction, the average value of the pressing force of the driven rotating body arranged corresponding to the area through which all types of sheet materials used pass is only a part of the sheet materials. The pressing force of the driven rotator disposed corresponding to the area where the traverse passes is smaller than the average value of the pressing force .

  According to the present invention, stable conveyance can be performed.

FIG. 1 is a side view illustrating an example of a device for discharging a liquid according to the present invention. FIG. 2 is an enlarged side view illustrating the vicinity of a conveyance guide member for explaining the first embodiment of the present invention. It is a perspective explanatory view of a press means similarly. FIG. 4 is an explanatory perspective view of a main part of a transport guide member and a holding unit. FIG. 3 is an explanatory front view of a holding portion of the driven rotor. It is a front explanatory view of a driven rotating body holding part used for describing a second embodiment of the present invention. It is a perspective explanatory view of the state where the press means provided for explanation of a 3rd embodiment of the present invention was attached. It is a perspective explanatory view of the state where the pressing means was removed similarly. It is principal part plane explanatory drawing used for description of 4th Embodiment of this invention. It is a principal part side explanatory drawing of the state which set the holding | maintenance means provided for description of 5th Embodiment of this invention to the holding position. FIG. 4 is an explanatory side view of a state in which the holding means is at a retracted position.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. An example of an apparatus for discharging liquid according to the present invention will be described with reference to FIG. FIG. 1 is an explanatory side view of the apparatus.

  This device is a serial type device in which a carriage 110 on which a recording head 109 is mounted is arranged so as to be able to reciprocate in a direction perpendicular to the plane of FIG. As the recording head 109, for example, a liquid ejection head for ejecting liquid is used, but the invention is not limited to this.

  A conveyance guide member 113 that is a conveyance guide member that guides the conveyance of the sheet material at a predetermined interval with respect to the recording head 109 is arranged.

  A transport roller 108 and a pressure roller 124 are disposed upstream of the transport guide member 113 in the sheet transport direction.

  A discharge roller pair 111a is disposed downstream of the conveyance guide member 113 in the sheet material conveyance direction. Downstream of the discharge roller pair 111a, further, a discharge roller pair 111b and 111c are arranged. The upper side of the pair of paper discharge rollers 111a to 111c is formed of, for example, a spur roller.

  Here, a pressing unit 200 that presses the sheet material 130 toward the conveyance guide member 113 (the conveyance guide member side) is disposed to face the upstream portion of the conveyance guide member 113 in the sheet material conveyance direction.

  On the other hand, a paper feed tray 100 for stacking and storing sheet materials 130 is detachably mounted on the bottom of the apparatus main body 10. The sheet materials 130 stacked on the sheet feed tray 100 are separated and fed one by one by a supply roller 101, conveyed through the first reverse conveyance path 11 using the guide members 103 and 104 as guide plates, and It is fed between the transport roller 108 and the pressure roller 124 via 107.

  The sheet material 130 on which an image is formed by the recording head 109 is sent by a pair of paper discharge rollers 111a to 111c and discharged to a paper discharge unit.

  Further, when performing double-sided printing, when the rear end of the sheet material 130 on which the image is formed on one side reaches the branch point 117 in front of the discharge roller pair 111c, the discharge roller pair 111c is rotated in the reverse direction.

  As a result, the sheet material 130 enters the switchback conveyance path 118 from the branch point 117 and is conveyed through the second reversal conveyance path 12 using the guide members 105 and 106 as guide plates via the reversing rollers 112a and 112b. Is fed between the conveying roller 108 and the pressure roller 124.

  Here, the switchback conveyance path 118 is a path that does not pass through the conveyance guide member 113 and is a reversing path that returns the sheet material 130 from the downstream side of the conveyance guide member 113 in the sheet material conveyance direction to the upstream side of the sheet material conveyance direction.

  Then, the sheet material 130 on which an image is formed on the other surface by the recording head 109 is sent by the discharge roller pairs 111a to 111c and discharged to the discharge section.

  Further, this apparatus has a linear transport path 13 through which the sheet material is transported linearly across the first reverse transport path 11 and the second reverse transport path 12.

  Further, guide members 103 and 104, which are members that close and open the linear transport path 13 so as to be able to open and close, are displaceably disposed at a portion where the linear transport path 13 and the first reverse transport path 11 intersect.

  The guide member 103 is disposed so as to be rotatable (displaceable) between a position shown by a solid line and a position shown by a broken line in FIG. The linear transport path 13 is closed when the guide member 103 is at a position shown by a solid line in FIG. 1 and opened when the guide member 103 is at a position shown by a broken line in FIG. It is possible to cross the road 11.

  The guide member 104 is disposed so as to be rotatable (displaceable) between a position shown by a solid line and a position shown by a broken line in FIG. The straight conveying path 13 is closed when the guide member 103 is at a position shown by a solid line in FIG. 1 and is opened when it is at a position shown by a broken line in FIG.

  These guide members 103 and 104 are set to the initial state (steady state) at the position shown by the solid line in FIG.

  A guide member 105 that is a member that closes the linear transport path 13 so that it can be opened and closed is displaceably disposed at a portion where the linear transport path 13 and the second reverse transport path 12 intersect.

  The guide member 105 is rotatably (displaceable) between a position shown by a solid line and a position shown by a broken line in FIG. The straight conveying path 13 is closed when the guide member 103 is at a position shown by a solid line in FIG. 1 and is opened when it is at a position shown by a broken line in FIG.

  Further, the guide member 106, which also serves as a guide member of the second reversing conveyance path 12 and forms a conveyance path at the entrance side of the conveyance roller 108, moves vertically between the position shown by the solid line and the position shown by the broken line in FIG. It is arranged to be movable (displaceable). The straight conveying path 13 is closed when the guide member 106 is at the position shown by the solid line in FIG. 1 and is opened when the guide member 106 is at the position shown by the broken line, so that the sheet material can pass through the second reverse conveying path 12.

  Next, a first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is an enlarged side view of the periphery of the conveyance guide member used for explaining the embodiment, FIG. 3 is a perspective view of the pressing means, FIG. 4 is a perspective view of the main parts of the conveyance guide member and the pressing means, and FIG. FIG. 4 is an explanatory front view of a holding portion of the driven rotor.

  The transport guide member 113 has at least two ribs 113a arranged in a direction intersecting the sheet material transport direction in an upstream portion of the sheet material transport direction.

  The pressing means 200 is provided between the two ribs 113 a of the conveyance guide member 113, the upstream side in the sheet conveyance direction, and has a driven rotating body 202 which comes into contact with the sheet material 130 and rotates according to the movement of the sheet material 130. are doing.

  In the present embodiment, three or more ribs 113a are provided, and the driven rotor 202 is disposed between the ribs 113a. The number of the driven rotary member 202 disposed between one rib constituted by the two ribs 113a and 113a can be one or more.

  The upstream portion of the two ribs 113a and 113a of the transport guide member 113 in the sheet material transport direction is a portion located on the upstream side in the sheet material transport direction of the recording head 109 which is a liquid ejection unit.

  The driven rotator 202 is rotatably held on a holding member 201 by a shaft portion 205 formed of a spring which is an elastic member. In this case, the shaft portion 205 penetrates the driven rotator 202, and the driven rotator 202 can rotate with respect to the shaft portion 205. The shaft portion 205 and the driven rotator 202 are integrated, and the shaft portion 205a is held. Any configuration rotatable with respect to the member 201 may be used.

  Further, in FIG. 5, one shaft 205 is used for one driven rotor 202, but a plurality of driven rotors 202 are arranged on one shaft 205 made of an elastic member such as a spring. You may.

  The driven rotator 202 is at a position where the lowermost portion is lower than the top of the rib 113a when the sheet material is not passing through. That is, as shown in FIG. 5, the driven rotating body 202 is held by the holding member 201 such that the lowermost part of the driven rotating body 202 is located at a position lower by Δh than the top of the rib 113a.

  With such a configuration, the sheet material 130 fed between the transport roller 108 and the pressure roller 124 from any one of the above-described first reverse transport path 11, second reverse transport path 12, and linear transport path 13 Is fed out from between the transport roller 108 and the pressure roller 124 and enters the rib 113 a of the transport guide member 113.

  At this time, since the driven rotator 202 whose lowermost portion is lower than the top of the rib 113a is disposed between the ribs 113a of the conveyance guide member 113, the sheet material 130 is moved by the driven rotator 202 to the conveyance guide member 113. The space between the ribs 113a, 113a is pressed.

  As a result, as shown in FIG. 5, the sheet material 130 is corrugated between the ribs 113a, 113a and the portion supported by the rib 113a in a direction orthogonal to the sheet material conveying direction.

  By waving the sheet material 130 in a direction perpendicular to the sheet material conveyance direction, the stiffness of the sheet material 130 is increased, the leading end is prevented from floating, interference with the recording head 109 is prevented, and stable conveyance is performed. Can be.

  Since the driven rotary member 202 is rotatably held by the shaft portion 205 formed of an elastic member, the driven rotary member 202 can be easily raised according to the thickness of the sheet material 130 while pressing the sheet material 130 toward the conveyance guide member 113 side. Direction.

  As a result, even if the thickness of the sheet material 130 becomes large, the increase in the force for holding the sheet material 130 is small, and in addition to the fact that the contact portion with the sheet material 130 is the driven rotating body 202, the increase in the transport load is suppressed. Thus, the sheet material 130 can be stably conveyed.

  In addition, by providing a switchback conveyance path (reversing path) that bypasses the conveyance guide member 113, the lowermost part of the rib 113 a is lower than the top of the rib 113 a at the portion of the pressing means 200 when the sheet material 130 switches back on the conveyance guide member 113. Can be prevented from being caused by interference between the driven rotator 202 and the sheet material, which are arranged at a lower height. Since a structure for retracting the pressing member at the time of switchback is not required, the structure is simplified.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a front explanatory view of a driven rotary member holding portion used for describing the embodiment.

  In the present embodiment, the shaft 205 a of the driven rotating body 202 is held by a spring, which is a kind of the elastic member 206, and is held rotatably with respect to the holding member 201.

  Even with such a configuration, the same operation and effect as those of the first embodiment can be obtained.

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a perspective explanatory view showing a state where the holding means provided for the description of the embodiment is attached, and FIG. 8 is a perspective explanatory view showing a state where the holding means is also removed.

  In the present embodiment, the holding means 200 is attached to the attachment portion 140 of the apparatus main body so as to be attachable and detachable (can be disassembled) by a fastening member 141 such as a screw.

  Thus, the holding means 200 can be removed (not used) according to the type of the sheet material 130 to be used (in the case of an extremely thick sheet material).

  Further, when the sheet material mainly used is changed, by removing the pressing means 200, the elastic member holding the driven rotary member 202 can be easily replaced with an elastic member having a different elastic force. .

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 9 is an explanatory plan view of a main part used for describing the embodiment.

  In the present embodiment, the pressing force by which the plurality of driven rotators 202 press the sheet 130 by the shaft portion 205 (or the elastic member 206) formed of an elastic member that holds the driven rotator 202 is orthogonal to the sheet conveying direction. The position of the driven rotator 202 in the direction differs.

  For example, when the sheet material 130 of a plurality of sizes is conveyed by the conveyance device, the driven rotator 202 is pressed against the driven rotator 202 arranged corresponding to the area through which the sheet materials of all types pass. The force is made weaker than the pressing force of the driven rotary member 202 arranged corresponding to the area where only some types of sheet materials 130 pass.

  In the area where the sheet material 130 of all types passes, the thickest sheet material naturally passes. Therefore, in this area, the pressing force is reduced correspondingly to the thick sheet material, so that the transport load can be more efficiently reduced. Can be reduced well.

  On the other hand, in a region where only the thin sheet material passes, the pressing force of the driven rotating body 202 is set to be large, so that the transportability of the thin sheet material can be secured.

  By doing so, the average value of the pressing force of the driven rotary member 202 arranged corresponding to the area through which all types of sheet materials pass corresponds to the area through which only some types of sheet materials pass. The configuration is smaller than the average value of the pressing force of the driven rotating body 202 arranged in the vertical direction.

  Further, with reference to the sheet material 130 to be conveyed, the pressing force of the driven rotating body 202 corresponding to the area A2 at the end of the sheet material 130 corresponds to the driven rotation corresponding to the central portion (corresponding to the area A1) of the sheet material 130. The pressing force of the body 202 is made stronger. Here, the sheet material is conveyed on the basis of the center. However, when the sheet material is conveyed on the basis of the end portion, the central portion of the sheet material does not always coincide with the central portion of the arrangement region of the driven rotary member.

  By locally setting the pressing force (pressing force) to the end of the sheet material as described above, the flatness of the conveyed sheet material 130 is impaired, so that a special thin paper sheet that cannot use a large pressing force can be used. Even if the sheet material is used, it is possible to prevent the leading end from being lifted up and to convey the sheet material without deteriorating the flatness of the central portion.

  Further, by doing so, it is possible to individually adjust (customize) the pressing force (pressing force) of the driven rotating body by the elastic member according to the type and size of the sheet material 130 used in the transport device. Become.

  Specifically, for example, when using a sheet material having a weak stiffness, the lifting amount of the sheet material can be more effectively suppressed by increasing the pressing force (pressing force). Since the stiffness of the sheet material is weak, even if the pressing force is increased, the influence on the increase of the transport load is small.

  On the other hand, when a thick sheet material is used, curling is less likely to occur with a thinner sheet material. Therefore, by lowering the pressing force and suppressing the transport load, the transport accuracy (stop position accuracy during intermittent transport) is improved. be able to.

  Further, when the size of the sheet material to be used is limited to a specific size, setting the pressing force of the driven rotating body corresponding to the end of the sheet material to be high is more effective in reducing the floating amount. It becomes.

  In addition, there is a fold at the end of the sheet material such as an envelope in the direction perpendicular to the conveyance direction, and a strong pressing force is required. By setting the pressing force at the position to be locally high, the lifting can be suppressed more effectively.

  Next, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a side elevational view of a main part in a state where a holding unit provided for the description of the embodiment is at a holding position, and FIG.

  In the present embodiment, the hinge 125 is attached to the holding member 201 of the holding means 200, and is held by the shaft 126 so as to be rotatable with respect to the transport guide member 113.

  When the pressing means 200 is at the pressing position in FIG. 10, the driven rotary member 202 can press the sheet material 130, and when the pressing means 200 is at the retracted position in FIG. 11, it is separated from the transport guide member 113.

  As a result, the pressure of the driven rotating body 202 can be released. In particular, it is possible to remove the sheet material 130 with a low load at the time of jam processing when the jam of the sheet material 130 occurs. In addition, it is possible to prevent the sheet material 130 from being damaged during the jam processing and the broken pieces remaining in the apparatus.

  In the present application, the “sheet material” is, as a specific example, a medium such as a paper, a recording paper, a recording paper, a film, a recording medium such as a cloth, an electronic substrate, and the like, unless otherwise limited, in a sheet shape or a thin plate shape. Includes everything.

  The material of the "sheet material" includes paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, and the like, and is not limited by the material.

  Further, in the present application, the “device that discharges liquid” is a device that includes a liquid discharge head or a liquid discharge unit and drives the liquid discharge head to discharge liquid.

The “device that discharges liquid” may include means for feeding, transporting, and discharging paper to which liquid can be attached, as well as a pre-processing device and a post-processing device.

  For example, as an “apparatus for ejecting liquid”, there is an image forming apparatus which is an apparatus for ejecting ink to form an image on a sheet.

  Further, the “device for discharging liquid” is not limited to a device in which a significant image such as a character or a graphic is visualized by the discharged liquid. For example, a pattern that forms a pattern that has no meaning in itself, and a pattern that forms a three-dimensional image are also included.

  The “liquid” is not particularly limited as long as it has a viscosity and surface tension that can be ejected from the head, and is not particularly limited at normal temperature and normal pressure, or a material whose viscosity becomes 30 mPa · s or less by heating and cooling. Preferably, there is.

  In addition, the “device for discharging liquid” includes a device in which a liquid discharge head and a device to which liquid can be attached relatively move, but is not limited thereto. Specific examples include a serial device that moves the liquid ejection head, a line device that does not move the liquid ejection head, and the like.

  Other examples of the “device for discharging liquid” include a processing liquid application device that discharges a processing liquid onto a sheet to apply the processing liquid to the surface of the sheet for the purpose of modifying the surface of the sheet. is there.

Reference Signs List 10 apparatus main body 108 transport roller 109 recording head 113 transport guide member (transport guide member)
113a rib 200 pressing means 201 holding member 202 driven rotating body 205 shaft (elastic member)
206 elastic member

Claims (8)

A conveyance guide member for guiding conveyance of the sheet material,
Holding means for pressing the sheet material toward the conveyance guide member side,
The transport guide member has at least two ribs that are disposed apart from each other in a direction orthogonal to the sheet material transport direction and extend in the sheet material transport direction, and support the sheet material.
The pressing means has a plurality of driven rotating body that rotates in accordance with movement of the sheet material in contact with the sheet material,
The driven rotator is rotatably held by a holding member via an elastic member, and is disposed between the two ribs of the conveyance guide member on the upstream side in the sheet material conveyance direction,
The driven rotating body is disposed at a position where the lowermost part is lower than the top of the rib,
The pressing force of the elastic member is different depending on the position of the driven rotating body in a direction orthogonal to the sheet material conveyance direction,
In the direction orthogonal to the sheet material transport direction, the average value of the pressing force of the driven rotating body arranged corresponding to the area through which all types of sheet materials used pass is only a part of the sheet materials. An apparatus for conveying a sheet material, wherein the sheet material is smaller than an average value of a pressing force of the driven rotary member arranged corresponding to an area through which the sheet passes. In a direction orthogonal to the sheet material conveyance direction, the pressing force of the driven rotating body arranged at a position where the end of the sheet material passes is the driven rotation arranged at a position where the center of the sheet material passes. The apparatus for conveying a sheet material according to claim 1 , wherein the pressing force is larger than a body pressing force. Apparatus for conveying a sheet material according to claim 1 or 2, wherein the shaft portion of the driven rotary member is the elastic member. Apparatus for conveying a sheet material according to any of claims 1 to 3, characterized in that the shaft portion of the driven rotary member is held by the elastic member. The apparatus according to any one of claims 1 to 4 , wherein the holding means is attachable to and detachable from an apparatus main body. The sheet material according to any one of claims 1 to 5 , wherein the pressing means is capable of retracting from the conveyance guide member to a position where the driven rotary body does not contact the conveyed sheet material. Equipment to transport. 2. A reversing path for returning the sheet material from a downstream side of the transport guide member in a sheet material transport direction to an upstream side of the sheet material transport direction in a path not passing through the transport guide member. An apparatus for conveying the sheet material according to any one of claims 6 to 6 . An apparatus for conveying the sheet material according to any one of claims 1 to 7 ,
Liquid discharging means for discharging liquid to the sheet material,
An apparatus for discharging liquid, wherein an upstream portion of the rib of the conveyance guide member in the sheet material conveyance direction is a portion of the liquid discharge unit on an upstream side in the sheet material conveyance direction.

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