JP2020199634A - Carriage and image formation device - Google Patents

Abstract

To provide a carriage that can effectively remove static electricity from a surface of a recording medium without impairing image quality.SOLUTION: A carriage, which is mounted with a discharge head that discharges an image formation material to a recording medium and reciprocates the discharge head in a direction crossing a conveying direction of the recording medium, comprises electricity-removing means that removes electricity of the recording medium during the reciprocation. The electricity removing means comprises electricity-removing members, arranged at both sides across a center in a reciprocating direction of the carriage respectively, whose distances from the recording medium differ between an upstream side and a downstream side in the conveying direction of the recording medium.SELECTED DRAWING: Figure 5

Description

The present invention relates to a carriage and an image forming apparatus.

An image forming apparatus is known that forms an image while reciprocating a carriage equipped with an ejection head that ejects an image forming material mainly containing a liquid (for example, liquid ink) with respect to a sheet-shaped recording medium. ing. In such an image forming apparatus, static electricity may be generated on the surface of the recording medium (the surface of the recording medium). When static electricity is generated on the surface of the recording medium, the image forming material ejected from the ejection head does not land at the target position, and the formed image may become unclear.

A method of removing static electricity from the surface of a recording medium in order to improve the quality of an image is known. For example, a method of spraying a chemical such as alcohol or an antistatic material on the surface of a recording medium to clean it is known. However, in this case, it is necessary for the user to clean the sprayed alcohol or the like, which is troublesome. In addition, the quality of the image formed by the influence of the chemicals used for cleaning may deteriorate.

Further, as a method of removing static electricity without using chemicals or the like, a method of attaching a static eliminator member to a carriage on which a discharge head is mounted and bringing the static eliminator member into contact with the surface of a recording medium to remove static electricity is also known. However, when the static elimination member comes into contact with the surface of the recording medium on which the image is already formed, the formed image is disturbed. Therefore, there is disclosed an electrostatic eliminator that removes static electricity from an image forming surface by moving the static eliminator member in a direction closer to or away from the surface of a recording medium (see Patent Document 1).

When applied to an image forming apparatus, the static eliminator disclosed in Patent Document 1 requires a mechanism for moving the static eliminator member closer to or further from the surface of the recording medium, which increases the cost. Further, if the distance from the surface of the recording medium is not properly adjusted, the static elimination member strongly hits the image formed on the surface of the recording medium and rubs against it.

In particular, when an image is formed by superimposing image forming materials while reciprocating the carriage a plurality of times, the distance between the image plane formed on the recording medium differs between the upstream side and the downstream side of the static elimination member mounted on the carriage. .. Therefore, when the technique disclosed in Patent Document 1 is used, the quality of the formed image is deteriorated unless the distance of the static elimination member with respect to the surface of the recording medium is adjusted according to the position on the surface of the recording medium. There is a problem.

An object of the present invention is to provide a carriage capable of effectively removing static electricity from the surface of a recording medium without impairing image quality.

In order to solve the above technical problem, one aspect of the present invention is equipped with a discharge head that discharges an image forming material to a recording medium, and reciprocates the discharge head in a direction intersecting the transport direction of the recording medium. The carriage is provided with static elimination means for removing static electricity from the recording medium during reciprocating movement, and the static elimination means are arranged on both sides of the carriage in the reciprocating movement direction, respectively, and the recording medium. It is characterized in that the static elimination member is provided with different distances from the recording medium on the upstream side and the downstream side in the transport direction of the recording medium.

According to the present invention, static electricity can be effectively removed from the surface of a recording medium without impairing image quality.

A partial perspective perspective view showing a schematic configuration of an embodiment of an image forming apparatus according to the present invention. The schematic diagram which shows the image forming apparatus which concerns on this embodiment from the side direction. A partial perspective plan view showing a schematic configuration of an image forming portion according to the present embodiment. The block diagram which shows the schematic structure of the control part which concerns on this embodiment. (A) Partial perspective front view and (b) Partial perspective side view showing a schematic configuration of an embodiment of a carriage according to the present invention. A partial perspective front view showing an example of the operation of the carriage according to the present embodiment.

Hereinafter, a carriage according to the present invention and an embodiment of an image forming apparatus equipped with the carriage will be described with reference to the drawings. First, an embodiment of the image forming apparatus will be described. In the following description, the same components will be designated by the same reference numerals on the drawings, and duplicate description will be omitted.

[Embodiment of image forming apparatus]
FIG. 1 is a diagram showing a schematic configuration of an inkjet recording apparatus 100, which is an embodiment of an image forming apparatus according to the present invention, partially viewed from diagonally upward. FIG. 2 is a schematic view showing the inkjet recording device 100 from the side direction. FIG. 3 is a plan view showing a part of the main part of the image forming unit 104 included in the inkjet recording device 100 as a perspective view.

As shown in FIG. 1, the inkjet recording device 100 includes a device main body 101, a feeding device 102, and a winding device 103. The object to be transported, which is a recording medium, is a sheet that can be rolled into a roll. The recording medium includes, for example, paper, coated paper, cardboard, OHP, plastic film, prepreg, silver foil and the like. In the present embodiment, the roll paper 120, which is a roll of paper, will be taken as an example for description.

The feeding device 102 supplies the roll paper 120 to the inside of the device main body 101. Inside the apparatus main body 101, an image forming unit 104 that forms an image on the roll paper 120 supplied in the transport direction indicated by the arrow B in FIG. 1 is arranged.

In the image forming portion 104, a guide rod 1 and a guide stay 2 which are guide members are hung on both side plates, and a carriage 110 is mainly indicated on the guide rod 1 and the guide stay 2 in the direction A of the arrow in FIG. It is supported so as to be movable in the scanning direction. The winding device 103 winds the roll paper 120 on which the image is formed.

As shown in FIG. 2, the feeding device 102 of the inkjet recording device 100 holds a roll body 112 in which paper is wound around a hollow shaft portion 115. The winding device 103 is provided with a hollow shaft portion 114 for winding the roll paper 120, and the roll body 112 is wound around the hollow shaft portion 114. The feeding device 102 and the winding device 103 may be integrally configured with the device main body 101 instead of being separate.

The feeding device 102 includes a feeding sensor 102a and a feeding roller 102b for detecting the feeding amount of the roll paper 120 by the feeding device 102, and the feeding roller 102b is a feeding motor 102c (see FIG. 4). It rotates by driving. The take-up device 103 includes a take-up sensor 103a and a take-up roller 103b for detecting the take-up amount of the roll paper 120 by the take-up device 103, and the take-up roller 103b is a take-up motor 103c (see FIG. 4). It rotates by driving.

Therefore, the roll paper 120 sent out from the feeding device 102 is conveyed directly under the image forming unit 104 by the conveying means 21, an image is formed, and the roll paper 120 is taken up by the winding device 103.

The control unit 200 (see FIG. 4), which will be described later, controls the transport of the roll paper 120 so that a constant tension is applied to the roll paper 120 by driving and controlling the feed motor 102c and the take-up motor 103c. At this time, since a constant torque is applied to the roll paper 120 being conveyed, the roll paper 120 can be conveyed without slack. The feeding roller 102b and the winding roller 103b rotate in the directions of the arcuate arrows in FIG. 2, respectively.

As shown in FIG. 2, on the device main body 101 side, a guide member 130 for guiding the roll paper 120 pulled out from the roll body 112 of the feeding device 102 and a roll paper 120 after suction downstream of the transport guide member 25 are provided. A paper ejection guide member 131 for guiding is arranged. The winding device 103 has a hollow shaft portion 114 such as a paper tube which is a core member. The tip of the roll paper 120 is adhered to the hollow shaft portion 114 with tape or the like.

The transporting means 21 includes a transport roller 23 for transporting the roll paper 120 to be fed from the feeding device 102, a pressure roller 24 arranged to face the roll paper 120, an encoder for detecting the transport amount of the roll paper 120, and the like. It has a sub-scanning sensor 21a (see FIG. 4) and a sub-scanning motor 21b (see FIG. 4) for rotating the transfer roller 23.

The transfer roller 23 and the pressure roller 24 form a transfer control means. A transfer guide member 25 having a plurality of suction holes formed on the downstream side of the transfer roller 23, and a suction fan 26 as a suction means for sucking from the suction holes of the transfer guide member 25 are provided.

The inkjet recording device 100 moves the carriage 110 in the main scanning direction at the time of image formation, and intermittently conveys the roll paper 120 that is pulled out from the roll body 112 of the feeding device 102 and guided along the guide member 130 by the conveying means 21. Transport to.

Then, the recording heads 111a to 111c are driven according to the image information (printing information) to discharge the liquid, so that a required image is formed on the roll paper 120. The image-formed roll paper 120 is guided by the paper discharge guide member 131 and wound around the hollow shaft portion 114 in the winding device 103. The roll paper 120 on the transfer roller 23 is conveyed while tension is applied from each of the feeding device 102 side and the winding device 103 side.

As shown in FIG. 3, the carriage 110 includes a plurality of liquid discharge heads that discharge liquid ink, which is an image forming material, toward the roll paper 120, and a head tank that supplies liquid to the liquid discharge heads (here). 3) recording heads 111a to 111c are mounted. Further, the carriage 110 is equipped with a media detection sensor 6s that detects whether or not the roll paper 120 is present at a position where an image forming material such as liquid ink is discharged.

A main scanning motor 8 which is a drive source for reciprocating the carriage 110 is arranged on one side in the main scanning direction. The drive pulley 9 is rotationally driven by the main scanning motor 8. A timing belt 11 is hung between the drive pulley 9 and the driven pulley 10 arranged on the other side in the main scanning direction. The belt holding portion of the carriage 110 is fixed to the timing belt 11. Therefore, the carriage 110 can be reciprocated in the main scanning direction by driving the main scanning motor 8. The driving means is composed of the main scanning motor 8, the driving pulley 9, the driven pulley 10, the timing belt 11, and the control unit (see FIG. 4) that controls the driving of the main scanning motor 8.

Here, the recording head 111 is arranged so as to be displaced from the sub-scanning direction orthogonal to the main scanning direction (arrow A direction). The sub-scanning direction is the transport direction of the roll paper 120. That is, the recording head 111a is arranged on the most upstream side of the carriage 110 in the transport direction, and the recording head 111c is arranged on the most downstream side of the carriage 110 in the transport direction.

Each of the recording heads 111 (recording heads 111a to 111c) is provided with a plurality of nozzle rows formed by arranging nozzles, which are discharge ports of image forming materials, in the sub-scanning direction by arranging a plurality of nozzle rows in the main scanning direction. Each of the nozzle rows is configured to eject an image forming material (for example, liquid ink) for forming images of different colors. For example, the four-row nozzle rows included in the recording head 111a are configured to eject liquid inks of different colors of yellow (Y), cyan (C), magenta (M), and black (K) for each row. There is. In the recording head 111 according to the present embodiment, the recording heads 111a and 111b are configured to discharge liquid inks of the same color, respectively. As a result, the recording head 111c includes two rows of nozzles for ejecting orange (O) and green (G) liquid inks.

As a result, the carriage 110 is reciprocated in the width direction of the roll paper 120 while ejecting liquid ink of each color from each nozzle port of the recording head 111, and the liquid ink is superimposed on the image forming surface of the roll paper. However, a predetermined image can be formed.

Further, the encoder sheet 12 is arranged along the moving direction of the carriage 110, and the carriage 110 is provided with an encoder sensor 13 for reading the encoder sheet 12. The linear encoder 14 is composed of the encoder sheet 12 and the encoder sensor 13, and the position and speed of the carriage 110 are detected from the output of the linear encoder 14.

Of the main scanning area of the carriage 110, the roll paper 120 is fed from the feeding device 102 in the recording area. After that, the roll paper 120 is intermittently conveyed by the conveying means 21 in the sub-scanning direction (paper conveying direction) orthogonal to the main scanning direction of the carriage 110.

The head tanks of the recording heads 111a to 111c are supplied with ink of each color from an ink cartridge 70 (see FIG. 1), which is a main tank that is replaceably mounted on the apparatus main body 101, via a supply tube. Further, on one side of the carriage 110 in the main scanning direction, a maintenance / recovery mechanism 80 (see FIG. 1) for maintaining / recovering the recording heads 111a to 111c is arranged on the side of the transport guide member 25.

In the above description, an inkjet recording device 100 including a feeding device 102 that holds a roll body 112 is an embodiment of the present invention. The form of the image forming apparatus according to the present invention is not limited to this. For example, it may be a device (liquid discharge device) that discharges a liquid including a feeding device 102 that holds the roll body 112.

The liquid discharge device is a device including a liquid discharge head or a liquid discharge unit, which drives the liquid discharge head to discharge the liquid. The device for discharging the liquid includes not only a device capable of discharging the liquid to a device to which the liquid can adhere, but also a device for discharging the liquid into the air or the liquid.

This liquid discharge device can also include means related to feeding, transporting, and discharging paper to which a liquid can adhere, as well as a pretreatment device, a posttreatment device, and the like. Examples of the liquid ejection device include an image forming apparatus that ejects ink to form an image on paper, and a powder in which powder is formed in layers in order to form a three-dimensional model (three-dimensional model). There is a three-dimensional modeling device (three-dimensional modeling device) that discharges the modeling liquid to the body layer.

Further, the liquid discharge device is not limited to the one in which a significant image such as characters and figures is visualized by the discharged liquid. For example, those that form patterns that have no meaning in themselves and those that form a three-dimensional image are also included.

The thing to which the liquid can adhere means the thing which the liquid can adhere at least temporarily, and the thing which adheres and sticks, the thing which adheres and permeates, and the like. Specific examples include media such as paper, recording paper, recording paper, film, cloth and other recording media, electronic substrates, electronic components such as piezoelectric elements, powder layers (powder layers), organ models, and inspection cells. Yes, including anything to which the liquid adheres, unless otherwise specified.

The materials to which the above-mentioned liquid can adhere are paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, building materials such as wallpaper and flooring, and even if liquid such as textiles for clothing is temporary. It suffices if it can be attached. The liquid also includes an ink, a treatment liquid, a DNA sample, a resist, a pattern material, a binder, a modeling liquid, a solution containing amino acids, proteins, and calcium, and a dispersion liquid.

Further, the liquid discharge device includes, but is not limited to, a device in which the liquid discharge head and the device to which the liquid can adhere move relatively. Specific examples include a serial type device that moves the liquid discharge head, a line type device that does not move the liquid discharge head, and the like.

Further, as the liquid ejection device, there is a processing liquid coating device that ejects the processing liquid onto the paper in order to apply the processing liquid to the surface of the paper for the purpose of modifying the surface of the paper. In addition, there is also an injection granulator which ejects a composition liquid in which a raw material is dispersed in a solution through a nozzle to granulate fine particles of the raw material.

The liquid discharge unit described above is a liquid discharge head integrated with functional parts and a mechanism, and is an assembly of parts related to liquid discharge. For example, the liquid discharge unit includes a head tank, a carriage 110, a supply mechanism, a maintenance / recovery mechanism 80, a main scanning movement mechanism in which at least one of the configurations is combined with a liquid discharge head, and the like.

Here, the integration includes, for example, a liquid discharge head, a functional component, a mechanism fixed to each other by fastening, bonding, engaging, or the like, and one in which one is movably held with respect to the other. Further, the liquid discharge head, functional parts, and mechanism may be configured to be detachable from each other.

For example, as a liquid discharge unit, there is one in which a liquid discharge head and a head tank are integrated. Further, there is a case in which the liquid discharge head and the head tank are integrated by being connected to each other by a tube or the like.

Here, a unit including a filter can be added between the head tank of these liquid discharge units and the liquid discharge head. Further, as a liquid discharge unit, there is a liquid discharge head in which a liquid discharge head and a carriage are integrated.

Further, there is a liquid discharge unit in which the liquid discharge head and the scanning movement mechanism are integrated by holding the liquid discharge head movably by a guide member forming a part of the scanning movement mechanism. Further, as a liquid discharge unit, there is a liquid discharge head, a carriage, and a main scanning movement mechanism integrated. Incidentally, the main scanning movement mechanism shall include the guide member alone.

In addition, as a liquid discharge unit, a cap member that is a part of the maintenance / recovery mechanism 80 is fixed to the carriage 110 to which the liquid discharge head is attached, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism 80 are integrated. There is something.

In addition, as a liquid discharge unit, there is a liquid discharge unit in which a tube is connected to a head tank or a liquid discharge head to which a flow path component is attached, and the liquid discharge head and a supply mechanism are integrated. Incidentally, the supply mechanism includes a tube unit and a loading unit unit.

Further, the pressure generating means used for the liquid discharge head is not limited. For example, a piezoelectric actuator (laminated piezoelectric element) may be used. In addition to this, a thermal actuator using an electric heat conversion element such as a heat generating resistor, an electrostatic actuator composed of a diaphragm and a counter electrode, or the like may be used. In addition, image formation, recording, printing, printing, printing, modeling, etc. in the terms in the specification are all synonymous.

[Control Mechanism of Inkjet Recording Device 100]
Next, the control mechanism of the inkjet recording device 100 will be described with reference to FIG. The configurations described above will be shown with the same reference numerals in FIG. 4, and duplicate description will be omitted.

The inkjet recording device 100 is controlled by a control unit 200 that realizes a calculation function, a liquid discharge control function, a sensor signal detection function, and a motor drive control function. The control unit 200 includes a CPU 210, an FPGA (Field-Programmable Gate Array) 220, and a motor driver 230.

The calculation function, the liquid discharge control function, the sensor signal detection function, and the motor drive control function implemented in the inkjet recording device 100 are realized by the cooperation of the CPU 210 and the FPGA 220. Further, the CPU 210 controls the operation of each motor mounted on the inkjet recording device 100 by using a motor driver 230 corresponding to each motor.

The output values of the linear encoder 14 and the media detection sensor 6s are input to the control unit 200, and the control unit 200 detects the position and speed of the carriage 110 based on these values. Then, the control unit 200 controls the main scanning motor 8 based on the detected position and speed of the carriage 110.

Further, the transfer amount of the roll paper 120 detected by the sub-scanning sensor 21a is input to the control unit 200. The control unit 200 controls the sub-scanning motor 21b based on the input amount of the roll paper 120 conveyed.

Further, the winding amount of the roll paper 120 detected by the winding sensor 103a is input to the control unit 200. The control unit 200 controls the take-up motor 103c based on the input take-up amount of the roll paper 120.

Further, the feed amount of the roll paper 120 detected by the feed sensor 102a is input to the control unit 200. The control unit 200 controls the feed motor 102c based on the input feed amount of the roll paper 120.

The carriage 110 is equipped with a static elimination member moving mechanism 152 that moves the static elimination member 151 (see FIG. 5) in a direction away from the surface of the roll paper 120 (also referred to as a recording medium surface or an image forming surface). .. The static elimination member moving mechanism 152 operates according to the rotation direction of the main scanning motor 8 to move the static elimination member 151 to a position away from the surface of the recording medium. Since the static elimination member 151 needs to be moved by the static elimination member moving mechanism 152 as long as the static elimination member 151 is separated from the surface of the recording medium, it is not necessary to adjust the movement amount. Further, the static elimination member 151 may be moved by the static elimination member moving mechanism 152 so as to be housed inside the carriage 110 as described later. Further, it is sufficient that the tip of the static elimination member 151 can be rotated around the attachment portion of the static elimination member 151 to the carriage 110 as a rotation axis so that the tip of the static elimination member 151 is separated from the surface of the recording medium.

When the carriage 110 reciprocates, the static elimination member moving mechanism 152 holds the tip of the static elimination member 151 at a position separated from the surface of the recording medium according to the moving direction. At this time, the static elimination member moving mechanism 152 moves and holds the static elimination member 151 arranged on the opposite side of the carriage 110 in the moving direction to a separated position. In other words, the static elimination member 151 is arranged on the opposite side of the moving direction according to the moving direction (that is, the rotation direction of the main scanning motor 8) when the carriage 110 is reciprocated on the surface of the recording medium. It is moved in the direction away from. The moved static elimination member 151 is held at a position separated from the surface of the recording medium until the moving direction of the carriage 110 that triggered the movement changes. The static elimination member 151 is moved by the static elimination member moving mechanism 152 to a separated position by the movement of the carriage 110 until the static elimination member 151 arranged on the opposite side in the moving direction reaches a position where it can come into contact with the surface of the recording medium. You just have to do it. The static elimination member moving mechanism 152 constitutes a static elimination member holding mechanism.

[Embodiment of Carriage 110]
Next, the configuration of the carriage 110 will be described in detail. FIG. 5A is a partially transparent front view when the carriage 110 is viewed from the downstream side in the transport direction (secondary scanning direction) of the roll paper 120. FIG. 5B is a partially transparent side view of the carriage 110 when viewed from one side in the main scanning direction.

As shown in FIG. 5A, the carriage 110 is arranged so that a plurality of recording heads 111 (111a, 111b, 111c) are arranged in the main scanning direction. As described above, the plurality of recording heads 111 are arranged so that their positions in the sub-scanning direction are different from each other in the arrangement in the main scanning direction. Then, an image is formed on the surface of the recording medium by the liquid ink ejected by each recording head 111, but the liquid ink is ejected while the carriage 110 reciprocates to form a layer on the surface of the recording medium. Adhere to. Therefore, the distance between the surface of the recording medium on which the image is formed and the recording head 111 becomes shorter toward the downstream side in the transport direction. In other words, the surface of the recording medium becomes higher on the downstream side in the transport direction as it passes through the reciprocating movement position of the carriage 110.

The carriage 110 includes a jam detection filler 113 outside the main scanning direction with respect to the arrangement of the recording heads 111. When the roll paper 120 being conveyed comes into contact with the jam detection filler 113, it is configured to notify the user of a transfer abnormality. The jam detection filler 113 is a jam detection member.

The carriage 110 is provided with static elimination means 150 at both ends outside the main scanning direction with respect to the arrangement of the recording heads 111. The static elimination means 150 includes a static elimination member 151 and a static elimination member moving mechanism 152, respectively.

In other words, the carriage 110 includes static elimination members 151 at both ends in the main scanning direction (both ends in the reciprocating movement direction). The static eliminator member 151 is attached to the static eliminator 150. The jam detection filler 113 may be attached to the static elimination member 151. In other words, the static elimination member 151 has static elimination means 150 arranged on both sides of the center of the carriage 110 in the moving direction (reciprocating movement direction), and the static elimination members 151 are attached to each of the static elimination means 150. There is.

The static eliminator member 151 is a member for removing static electricity charged on the roll paper 120. The static eliminating member 151 is formed of a material that removes static electricity on the surface of the recording medium of the roll paper 120 during the reciprocating movement of the carriage 110 in the main scanning direction, and does not roughen (damage) the surface of the recording medium or the image forming surface. Not) made of material.

As shown in FIG. 5B, a plurality of static elimination members 151 are arranged side by side in the transport direction of the roll paper 120. Then, in the carriage 110, the first static elimination member 151a is arranged further upstream than the recording head 111c arranged at the uppermost stream in the conveying direction of the roll paper 120. The first static elimination member 151a has dimensions such that when the carriage 110 reciprocates in the main scanning direction, its tip portion comes into contact with a contact pressure that does not roughen the surface of the recording medium of the roll paper 120. That is, the distance between the first static elimination member 151a and the roll paper 120 is such that it comes into contact with the roll paper 120 during the reciprocating movement.

A plurality of second static elimination members 151b are arranged on the downstream side in the transport direction from the first static elimination member 151a. The second static elimination member 151b is arranged so as to correspond to the position of the recording head 111 in the sub-scanning direction. Further, the distance of the second static elimination member 151b from the roll paper 120 is longer on the downstream side than on the upstream side in the transport direction. For example, as illustrated in FIG. 5B, the distance between the tip portion and the surface of the recording medium gradually increases from the upstream side in the transport direction to the downstream side in the transport direction.

In other words, the second static elimination member 151b arranged in the region where the recording head 111 reciprocates (C in FIG. 5) has a gap between the tip portion and the image forming surface from upstream to downstream in the transport direction. Is configured to be wide.

As described above, the carriage 110 according to the present embodiment can effectively remove static electricity by coming into contact with the surface of the recording medium before the image is formed. Further, on the surface of the recording medium having different heights depending on the sub-scanning direction, static elimination members 151 having different heights are arranged at positions corresponding to the respective recording heads 111. As a result, it is possible to eliminate static electricity accumulated in the image forming eyes while preventing the static electricity removing member 151 from rubbing the image forming surface and causing image defects.

Further, the jam detection filler 113 can be provided with a static elimination function.

[Operation of static elimination member 151]
Next, the operation of the static elimination member 151 during the reciprocating operation of the carriage 110 will be described with reference to FIG. FIG. 6A illustrates a state when the carriage 110 moves to the left on the paper surface. FIG. 6B illustrates a state when the carriage 110 moves to the right of the paper surface. In FIG. 6, the jam detection filler 113 is not shown.

As shown in FIG. 6, when the carriage 110 reciprocates, the static elimination member 151 arranged on the side corresponding to the moving direction is in a normal position. On the other hand, the static elimination member 151 arranged on the opposite side in the moving direction is moving in the direction away from the surface of the recording medium.

The static elimination member 151 is moved by the static elimination member moving mechanism 152 included in the static elimination means 150. The movement mode of the static elimination member 151 may be movement to a position where the static elimination member 151 is housed in the static elimination means 150 (or in the carriage 110) as illustrated in FIG. Further, since the static elimination member 151 on the side opposite to the moving direction of the carriage 110 may reach a position where it does not come into contact with the image forming surface by moving, it may jump up to any of the main scanning directions.

Each of the static elimination members 151 is configured to be cleaned by a maintenance / recovery mechanism 80 (see FIG. 1) arranged in the main scanning direction. In this case, when the carriage 110 moves to the maintenance / recovery mechanism 80, as illustrated in FIG. 5, the static elimination members 151 at both ends are in a state where they can come into contact with the maintenance / recovery mechanism 80, and dust and the like adhering to the tip are removed. It should be possible to remove it. As a result, the static elimination member 151 can be kept clean. Therefore, it is possible to prevent the dirt from being transferred from the static elimination member 151 to the surface of the recording medium.

As described above, according to the carriage 110 according to the present embodiment, when the surface of the recording medium is statically eliminated by the static elimination member 151, the static elimination member 151 and the recording medium are directed downstream in the transport direction of the roll paper 120 which is the recording medium. It has a configuration that widens the gap (GAP) between the surfaces. As the image is nearing completion, the amount of image forming material (liquid ink) adhering to the surface of the recording medium increases, the surface of the recording medium rises due to swelling, and the GAP of the surface of the recording medium and the static elimination member 151 may become narrower. is there. On the other hand, the static elimination member 151 can reliably eliminate static electricity while reducing the risk of rubbing the image forming surface.

In other words, the static elimination member 151 is projected only on the moving direction side of the carriage 110, and the static elimination member 151 on the opposite side is moved (retracted) in a direction away from the surface of the recording medium, so that the liquid ink that truly requires static elimination is required. Before ejection, the static elimination member 151 on the carriage moving direction side can reliably eliminate static electricity on the surface of the recording medium. Further, it is possible to prevent the image forming surface from being rubbed by the static elimination member 151 on the opposite side.

The second static elimination member 151b constituting the static elimination member 151 is selected so that the effective static elimination current value is larger than the effective static elimination current value of the first static elimination member 151a. As a result, the optimum static elimination effect can be obtained according to the distance between the second static elimination member 151b and the surface of the recording medium.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical gist thereof, and all the technical matters included in the technical idea described in the claims can be made. It is the subject of the present invention. Although the above embodiment shows suitable examples, those skilled in the art can realize various modified examples from the disclosed contents, but these are described in the attached claims. Included in the technical scope.

1: Guide rod 2: Guide stay 6s: Media detection sensor 8: Main scanning motor 9: Drive pulley 10: Driven pulley 11: Timing belt 12: Encoder sheet 13: Encoder sensor 14: Linear encoder 21: Conveying means 21a: Sub-scanning Sensor 21b: Sub-scanning motor 23: Conveying roller 24: Pressurizing roller 25: Conveying guide member 26: Suction fan 70: Ink cartridge 80: Maintenance / recovery mechanism 100: Inkjet recording device 101: Device main body 110: Carriage 111: Recording head 111a : Recording head 111b: Recording head 111c: Recording head 112: Roll body 113: Jam detection filler 114: Hollow shaft portion 115: Hollow shaft portion 120: Roll paper 130: Guide member 131: Paper discharge guide member 150: Static elimination means 151: Static elimination member 151a: First static elimination member 151b: Second static elimination member 152: Static elimination member moving mechanism 200: Control unit 210: CPU
220: FPGA
230: Motor driver

Japanese Unexamined Patent Publication No. 2015-123638

Claims (8)

A carriage equipped with a discharge head that discharges an image forming material onto a recording medium and reciprocates the discharge head in a direction intersecting the transport direction of the recording medium.
It has a static elimination means for static elimination of the recording medium during reciprocating movement.
The static elimination means are provided on both sides of the carriage in the reciprocating movement direction, and the distance from the recording medium is different between the upstream side and the downstream side in the transport direction of the recording medium.
A carriage characterized by that. The static elimination means includes a static elimination member holding mechanism for holding the static elimination member arranged on the opposite side of the moving direction when the carriage reciprocates at a position away from the surface of the recording medium.
The carriage according to claim 1. The static elimination member is
Among the discharge heads mounted on the carriage, the first static eliminator member arranged further upstream than the discharge head mounted on the most upstream side in the transport direction.
It has a plurality of second static elimination members arranged on the downstream side in the transport direction from the first static elimination member.
The distance between each of the second static elimination members and the recording medium is longer on the downstream side in the transport direction than on the upstream side in the transport direction of the recording medium.
The carriage according to claim 1 or 2. The distance of the first static elimination member to the recording medium is such that it comes into contact with the recording medium.
The distance between each of the second static elimination members and the recording medium is such that the image forming material discharged to the recording medium does not come into contact with the recording medium.
The carriage according to claim 3. The distance of each of the second static elimination members with respect to the recording medium gradually increases from the upstream side to the downstream side in the transport direction of the recording medium.
The carriage according to claim 3. The second static elimination member is the second static elimination member arranged on the downstream side in the transport direction of the recording medium with respect to the effective static elimination current value of the second static elimination member arranged on the upstream side in the transport direction of the recording medium. It is made of a material with a large effective static elimination current value.
The carriage according to any one of claims 3 to 5, wherein the carriage according to any one of claims 3 to 5. The static elimination member is attached to a jam detection member mounted on the carriage.
The carriage according to any one of claims 1 to 6, characterized in that. An image forming apparatus having a discharge head for discharging an image forming material onto a recording medium, a carriage equipped with the discharge head, and a driving means for reciprocating the carriage in a main scanning direction intersecting the transport direction of the recording medium. And
An image forming apparatus, wherein the carriage is the carriage according to any one of claims 1 to 7.