JP2011230315A - Drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drawing device that can appropriately adjust positions of a plurality of printing heads for printing on a recording medium fed along a curved surface corresponding to a curvature of the recording medium.SOLUTION: The drawing device includes: a recording medium feeding unit for feeding a recording medium A along a recording medium feeding route L1 following the curved surface; the plurality of printing heads 76 for printing on the fed recording medium; a head plate 94 having a pair of sub-plates 95 arranged in the shape of a mountain in the feeding direction of the recording medium along the recording medium feeding route to which the plurality of printing heads are mounted; and an angle adjusting unit 100 for adjusting an angle of the mountain formed by the pair of sub-plates 95.

Description

  The present invention relates to a drawing apparatus that performs printing using a plurality of print heads on a recording medium fed along a curved surface.

As this type of drawing device, a device that records images by ejecting ink from a plurality of print heads fixed to a head holding plate on continuous paper conveyed following the outer peripheral surface of a rotating drum is proposed. (See Patent Document 1).
The apparatus has four flat head holding plates provided for each ink color (K, C, M, Y) of the print head, and the four head holding plates are arranged on each plate by the head holding side plate. The drawing operation is performed with the center line of the image being fixed so as to be orthogonal to the normal line of the drum. That is, the four head holding plates are supported by the pair of head holding side plates so that the plates adjacent to each other along the outer peripheral surface of the drum form a mountain shape. The four head holding plates and the pair of head holding side plates are integrated as a unit, and the gap amount (paper gap) between the plurality of print heads and the printing surface of the continuous paper is set to a predetermined amount via each plate. Maintained.

JP 2008-074051 A

However, in the above apparatus, since the four head holding plates for holding a plurality of print heads are unitized as a unit, for example, continuous papers having different thicknesses are introduced and the paper gap is maintained at a predetermined amount. If the plurality of print heads are slightly moved in the normal direction through the four head holding plates, in other words, if the curvature of the continuous paper is slightly changed, the paper gaps of the plurality of print heads are not adjusted uniformly.
That is, a plurality of print heads are moved integrally by four unitized head holding plates, and this is moved by a predetermined dimension (A) in the normal direction with reference to one print head. In other print heads, when the angle (θ) between one print head and its normal line is moved, only ACOSθ moves, and there is a problem that the paper gap cannot be adjusted properly between a plurality of print heads. It was. In addition, there is a problem that the nozzle surface of the other print head is not orthogonal to the normal line (discharged obliquely with respect to the continuous paper) due to the minute movement.

  In view of the above-described points, the present invention provides a drawing apparatus capable of appropriately adjusting the positions of a plurality of print heads that perform printing on a recording medium sent along a curved surface in accordance with the curvature of the recording medium. This is the issue.

  A drawing apparatus according to the present invention includes a recording medium feeding unit that feeds a recording medium along a recording medium feeding path that follows a curved surface, a plurality of print heads that perform printing on the recording medium that is sent, and a recording medium feeding path. A head plate having a pair of sub-plates that are arranged in a chevron shape in the recording medium feeding direction and mounted with a plurality of print heads, and an angle adjusting means for adjusting the angle of the chevron formed by the pair of sub-plates, It is provided with.

  According to the above configuration, for example, even if the head plate is separated from the recording medium in the normal direction, the angle formed by the pair of sub plates can be adjusted. Can be kept perpendicular to the normal line. At the same time, the paper gap between the plurality of print heads and the recording medium can be adjusted appropriately. In other words, the positions of the plurality of print heads can be appropriately adjusted according to the curvature of the recording medium. Thereby, it is possible to maintain high printing accuracy in paper gap adjustment and the like.

  In this case, the head plate suspends and supports the pair of subplates, and further includes a head plate body facing the peripheral edge of the pair of subplates, and the angle adjusting means is supported by the headplate body, Engage with the hinge shaft that rotatably connects the sub-plates at the abutting portions and the outer ends of the feed direction of the pair of sub-plates, and rotate the pair of sub-plates around the hinge shaft in the opening and closing direction And an angle adjusting mechanism for adjusting the angle.

  In this case, the angle adjustment mechanism has a pair of adjustment mechanisms that are interposed between the head plate main body and the outer end portions of the sub-plates, and advance and retract in the direction of separating the outer end portion from the head plate main body. Preferably it is.

  According to said structure, the angle which a pair of subplate makes can be freely adjusted with a simple structure. Further, if the distance between the outer end of each sub-plate and the head plate is set to be different, even if a deviation occurs between the boundary between the pair of sub-plates and the center line of the curved surface of the recording medium feed path, By keeping the sub-plate perpendicular to the normal line of the curved surface to which the recording medium is sent, the paper gap between the plurality of print heads and the recording medium can be adjusted appropriately.

  In this case, the outer end portion of each sub-plate is made of a magnetic material, and each adjustment mechanism is screwed into each head plate body, and at least a tip portion that contacts the outer end portion is made of a magnet. A screw is preferred.

  According to the above configuration, as each sub plate rotates, the outer end portion of each sub plate and the head plate are not parallel to each other. The outer end of the sub-plate can be pulled and opened / closed. In addition, it is preferable to comprise the outer end part of a subplate and the front-end | tip part of an adjustment screw with a neodymium magnet etc.

  The angle adjusting means is interposed between a spring for biasing the pair of sub-plates in the opening direction around the hinge axis, and between the head plate main body and the outer end portion of each sub-plate. It is preferable to have a pair of adjustment screws that move the outer end portion in the separation direction.

  According to said structure, the angle which a pair of subplate makes can be freely adjusted with a simple structure.

  In these cases, the head plate on which a plurality of print heads are mounted moves in the normal direction of the recording medium feed path passing through the boundary between the pair of sub-plates, It is preferable to further include interlocking adjusting means for adjusting the angle adjusting means so that the nozzle surface of the print head is parallel to the tangent to the recording medium feeding path.

  According to the above configuration, since the nozzle surface of each print head can be automatically adjusted to be parallel to the tangent line of the recording medium feed path, the paper gap between the plurality of print heads and the recording medium is always properly adjusted. It is possible to adjust and draw with high accuracy.

  In this case, each print head is preferably composed of an inkjet head.

  The plurality of print heads preferably constitute one drawing line with respect to the width of the recording medium.

  According to the above configuration, it is possible to perform drawing with high accuracy on a recording medium sent along a curved surface. In addition, printing can be performed without moving a plurality of print heads in the width direction of the recording medium, and the drawing apparatus can be configured with an easy configuration.

  The recording medium feeding means preferably has a rotating drum that feeds the recording medium in close contact with the outer peripheral surface.

  According to the above configuration, when the recording medium is fed following the rotating drum, it is possible to prevent the recording medium from floating or being shifted obliquely with respect to the feeding path.

It is a front view of a drawing apparatus. It is a back surface perspective view of an apparatus main body. It is a front view of a carriage unit. It is a perspective view of an inkjet head. It is a side view of the head unit concerning a 1st embodiment. It is a back surface top view of the head unit concerning a 1st embodiment. It is sectional drawing of the head unit which concerns on 1st Embodiment. It is a side view of a head unit at the time of angle adjustment of a subplate concerning a 1st embodiment. It is a back surface top view of the head unit concerning a 2nd embodiment. It is sectional drawing of the head unit which concerns on 2nd Embodiment.

  Hereinafter, a drawing apparatus to which an embodiment of the present invention is applied will be described with reference to the accompanying drawings. This drawing apparatus is a center drum type recording apparatus in which a plurality of ink jet heads are arranged in the circumferential direction, and printing is performed on a long recording medium supplied reel-to-reel using UV ink (ultraviolet curable ink). carry out. The recording medium is, for example, a sheet-like material such as a label film or paper, and has various widths and thicknesses to be printed. In the following description, the direction penetrating the paper surface in FIG. 1 is front and rear, the front side is “front”, and the back side is “rear”. Specifically, the extending direction of the rotating shaft (drum shaft 62) of the rotating drum 61 (described later) is the front and rear, the direction from the drum motor 64 (described later) toward the rotating drum 61 is the front direction (front side), and the rotating drum 61 A direction toward the drum motor 64 is a back direction (back side). In the recording medium conveyance path, the medium supply device 6 side described later is referred to as “upstream side”, and the medium recovery device 7 side described later is referred to as “downstream side”.

  As shown in the overall view of FIG. 1, a drawing apparatus 1 includes a center drum type apparatus main body 2 that performs printing on a recording medium A by an ink jet method, and a recording medium that has been supplied with the recording medium A and has been printed. A reel-to-reel medium supply / recovery device 3 for collecting A and a control device (not shown) for overall control of these components are provided. The medium supply / collection apparatus 3 includes a medium supply apparatus 6 that supplies the recording medium A to the apparatus main body 2 and a medium recovery apparatus 7 that recovers the recording medium A from the apparatus main body 2. On the other hand, the medium feed path L of the recording medium A configured in the apparatus main body 2 and the medium supply / collection apparatus 3 is close to the supply feed path L1 from the medium supply apparatus 6 to the apparatus main body 2 and the circle configured in the apparatus main body 2. An arc-shaped print feed path L2 and a collection feed path L3 from the apparatus main body 2 to the medium collection apparatus 7 are provided.

  The recording medium A supplied from the medium supply device 6 through the supply feed path L1 is fed along the print feed path L2 in the apparatus main body 2, and is used for printing in this portion. In addition, the recording medium A that has been printed is collected by the medium collection device 7 through the collection feeding path L3.

  The medium supply device 6 is disposed on the downstream side of the supply reel 11, a supply reel 11 for supplying the recording medium A wound in a roll shape, a supply motor (not shown) for supplying and rotating the supply reel 11, and a recording medium. A forward tension unit 13 that applies a forward tension to A, and a steering unit 14 that is disposed downstream of the forward tension unit 13 and feeds the recording medium A into the apparatus main body 2 while positioning the recording medium A in the width direction. When the feeding device is driven in synchronism with the apparatus main body 2 by the control device, the medium feeding device 6 feeds the recording medium A from the feeding reel 11 and feeds it along the feeding feed path L1.

  On the other hand, the medium recovery device 7 includes a winding reel 21 that winds the printed recording medium A in a roll shape, a winding motor (not shown) that winds and rotates the winding reel 21, and upstream of the winding reel 21. The back tension unit 23 that is provided on the side and applies back tension to the recording medium A, and the recording medium A that is provided on the upstream side of the back tension unit 23 and is sent out from the apparatus main body 2 is sent in a U-turn. As described above, a return unit 25 that changes the collection feeding path L3 is provided. When the medium recovery device 7 drives the take-up motor in synchronization with the device main body 2 by the control device, the recording medium A is sent from the device main body 2 and sent along the recovery feed path L3.

  As shown in FIGS. 1 and 2, the apparatus main body 2 has a large-diameter rotating drum 61, and a medium feeding mechanism 41 (recording medium feeding means) that feeds the recording medium A along the print feeding path L2, respectively. Has a plurality of inkjet heads 76 (print heads) and corresponds to the plurality of carriage units 42 arranged radially with respect to the rotary drum 61 so as to face the print feed path L2, A plurality of maintenance units 43 disposed on the back side, and a main curing UV irradiation unit 44 facing the recovery feed path L3 and curing the UV ink of the recording medium A are provided. The apparatus body 2 is entirely covered with a chamber (not shown). The plurality of carriage units 42 are units for the colors of the UV ink to be supplied, and constitute a printing unit 48 as a whole.

  As shown in FIG. 2, the apparatus frame 46 includes a base frame 51 serving as a machine base, a main frame 52 erected on the rear half of the base frame 51, and a plate-like subframe widely provided on the front surface of the main frame 52. 53, and a chamber frame 54 disposed in the front portion of the main frame 52 via the subframe 53. Walls (not shown) are respectively attached to the surfaces constituting the main frame 52 and the chamber frame 54, and these constitute a chamber that covers the entire apparatus main body 2. That is, the apparatus main body 2 manages the temperature and cleanliness inside the chamber by this chamber. A predetermined gap is provided between the chamber frame 54 and the base frame 51, and the recording medium A is fed and discharged in this gap.

  As described above, the printing unit 48 includes the plurality of carriage units 42 arranged radially with respect to the rotary drum 61. The plurality of carriage units 42 are ink color units, and are arranged in the order of cyan (C), magenta (M), yellow (Y), and black (Bk) from the start side to the end side of the print feed path L2. Thus, they are arranged at substantially equal intervals in the circumferential direction. Although details will be described later, a plurality of inkjet heads 76 are mounted on each carriage unit 42, and the plurality of inkjet heads 76 constitute a head 77 corresponding to the recording medium A having the maximum width. For this reason, the heads 77 of the respective colors sequentially face the recording medium A that is printed and fed along the print feeding path L2, and desired color printing based on the print data is performed on the recording medium A.

  As shown in FIG. 3, each carriage unit 42 includes a carriage base 81 fixed to the subframe 53 and a box slidably supported by the carriage base 81 in the normal direction of the outer peripheral surface of the rotary drum 61. A carriage 82 in a mold frame format, a head unit 83 mounted on the carriage 82 and mounted with a plurality of inkjet heads 76, and a head unit 83 that moves forward and backward in the normal direction of the outer peripheral surface of the rotary drum 61 via the carriage 82. An axis moving mechanism 84 (separating and moving means) and a head control board module (not shown) that is mounted on the carriage 82 and applies ejection waveforms to the plurality of inkjet heads 76 are provided.

  The Z-axis moving mechanism 84 is configured with a motor drive using a lead screw mechanism, for example. The Z-axis moving mechanism 84 adjusts the gap between the ink jet head 76 and the recording medium A with respect to the recording medium A having different thicknesses. Move forward and backward. All of the sub tank units (not shown) are supported by the support fittings in an upright posture (an posture in which the ink discharge port faces downward in the vertical direction).

  As shown in FIG. 4, each inkjet head 76 is constituted by a 2-inch inkjet head 76, and has two nozzle rows 93 including a plurality of discharge nozzles 92 parallel to each other on the nozzle surface 91. ing. As shown in FIG. 6, in each sub-plate 95, the plurality of ink-jet heads 76 are arranged in a staggered manner in the front-rear direction, and the plurality of ink-jet heads 76 mounted on one sub-plate 95 and the other sub-plate 95 are arranged. The plurality of inkjet heads 76 mounted on the plate 95 are arranged with a 1/4 nozzle pitch position shifted in the front-rear direction (nozzle row direction). For this reason, the head 77 as a line head extending in the front-rear direction (the width direction of the recording medium A) by the all inkjet heads 76 mounted on the head plate main body 94 via the pair of sub-plates 95, that is, recording with the maximum width. A head 77 having a 1/4 nozzle pitch corresponding to the medium A is configured, and high-resolution printing is possible. This arrangement pattern is an example, and the number and the number of the inkjet heads 76 and the arrangement pattern are arbitrary.

  As shown in FIGS. 5 and 6, the head unit 83 includes a head plate composed of a head plate main body 94 and a pair of left and right sub-plates 95 assembled to the lower surface of the head plate main body 94 (on the rotating drum 61 side). A plurality of inkjet heads 76 (seven in this embodiment) mounted on the sub-plate 95, and each sub-plate 95 in the sliding direction (horizontal direction with respect to the head plate main body 94) and the Θ-axis direction (Z-axis as the rotation axis) A fine adjustment mechanism 120 for adjusting the position in the rotation direction), and an angle adjusting means 100 for supporting each sub plate 95 on the head plate body 94 and adjusting an angle formed by each sub plate 95. Yes. The pair of left and right sub-plates 95 are arranged in a mountain shape in the feeding direction of the recording medium A, and the angle is adjusted by the angle adjusting means 100 so as to be parallel to the tangent line of the printing feed path L2.

  The head plate body 94 is a substantially rectangular thick plate made of stainless steel or the like, and has a pair of mounting openings 142 into which the fine adjustment mechanism 120 is loosely fitted. Each mounting opening 142 is disposed so as to be covered by the sub-plate 95 from below, and the fine adjustment mechanism 120 is inserted therethrough. The fine adjustment mechanism 120 is inserted through the mounting opening 142 of the head plate main body 94 and extends vertically, and supports the sub plate 95 on the lower surface so that the position of the sub plate 95 can be adjusted in the slide direction (X-axis direction) and the Θ-axis direction. ing.

  Each sub-plate 95 is for attaching a plurality of held inkjet heads 76 to the head plate main body 94, and is formed of a thick plate such as rectangular stainless steel. In the center of the sub-plate 95, a plurality of opening portions 96 for attaching the ink jet head 76 are formed in two rows so that the nozzle row 93 of the ink jet head 76 faces in the front-rear direction.

  In addition, two hinge bearing portions 97 project from the inner end portion on the abutting side of each sub-plate 95 so as to be spaced apart in the front-rear direction, and the hinge bearing portions 97 in the pair of sub-plates 95 are slid. They are engaged so that they touch. As a result, the angle of the pair of sub-plates 95 is adjusted while being positioned in the front-rear direction. In addition, a screw receiving portion 98 is attached to the outer end portion of each sub-plate 95, and is positioned in the middle in the front-rear direction and a later-described adjustment screw 110 contacts. The screw receiving portion 98 is formed integrally with a thin attachment portion 98a that is attached to the sub plate 95 and a contact portion 98b that is thick and abuts the adjustment screw 110. The contact portion 98b is formed as a sub plate. In a state of projecting outward from 95, it is fixed to the outer end portion of the sub plate 95 with screws by an attaching portion 98a addressed to the sub plate 95 from above (see FIG. 7B).

  The angle adjusting means 100 includes a hinge shaft 101 that passes between the four hinge bearing portions 97 in total, and supports the hinge shaft 101 with both ends, and a pair of sub-plates 95 via the hinge shaft 101. And a pair of L-shaped brackets 102 supported by the head plate main body 94 and an angle adjusting mechanism 103 for adjusting the opening angle of the pair of sub-plates 95 around the hinge shaft 101. The pair of L-shaped brackets 102 are fixed downward at the left and right intermediate positions on the back surface of the head plate main body 94, and are attached to the hinge bearing portions 97 located at the outermost ends in the front-rear direction, and both ends of the hinge shaft 101 The part is supported by both ends (see FIG. 7A). The pair of sub-plates 95 are rotatably supported by the hinge shaft 101 at the hinge bearing portions 97 thereof.

  The angle adjustment mechanism 103 is attached to the head plate main body 94 and is provided so as to be wound around a pair of adjustment screws 110 that abut on the screw receiving portions 98 of the respective sub plates 95 and an intermediate portion in the axial direction of the hinge shaft 101. Two torsion coil springs 111. The two torsion coil springs 111 come into contact with slit-like grooves 99 formed at the abutting portions of the pair of sub-plates 95 from below to open the pair of sub-plates 95 in the opening direction (head plate main body 94 side). (See FIGS. 6 and 7 (b)).

  As shown in FIG. 7B, each adjustment screw 110 is interposed between the outer end portion of the head plate main body 94 and the screw receiving portion 98 of each sub plate, and is attached to the outer end portion of the head plate main body 94. A screwed portion 110a that is screwed and a tip contact portion 110b that contacts the sub-plate 95 are provided. The adjusting screw 110 advances and retreats in the vertical direction with respect to the head plate body 94 by adjusting the rotation of the screwing portion 110a. Further, the tip contact portion 110b has a spherical contact portion with the sub plate 95, and suppresses friction with the head plate main body 94.

  When the adjustment screw 110 is moved to the recording medium A side by screwing, the tip contact portion 110 b presses the screw receiving portion 98 of the sub-plate 95 against the head plate main body 94 against the torsion coil spring 111. . As a result, the sub plate 95 rotates in the closing direction about the hinge shaft 101. On the other hand, when the adjustment screw 110 moves to the head plate 94 side, the sub plate 95 rotates in the opening direction around the hinge shaft 101 by the urging force of the torsion coil spring 111. In this manner, the angle adjustment mechanism 103 adjusts the angle of the mountain shape of the pair of sub plates 95.

  The tip abutting portion 110b has a flat abutting surface and is supported rotatably about a shaft extending in the front-rear direction with respect to the screwing portion 110a of the adjusting screw 110, and the tip abutting portion 110b. May be configured to contact along the inclination of the screw receiving portion 98. Further, a bearing may be provided between each hinge bearing portion 97 and the hinge shaft 101 in order to adjust the angle with high accuracy.

  Incidentally, in order to adjust the gap between the inkjet head 76 and the recording medium A for the recording medium A having different thicknesses, the head unit 83 (carriage 82) is moved in the Z-axis direction (normal direction) by the Z-axis moving mechanism 84. In other words, when the curvature of the print feed path L2 relative to the head unit 83 slightly changes, each sub-plate 95 is not parallel to the tangent line of the print feed path L2 (the rotating drum 61), and each inkjet head The difference in gap between the recording medium 76 and the recording medium A changes (increases). However, since the angle formed by the pair of sub-plates 95 can be adjusted by the angle adjusting means 100 as described above, according to the movement of the head unit 83 in the axial direction (normal direction) by the Z-axis moving mechanism 84, The gaps between the plurality of inkjet heads 76 and the recording medium A can be adjusted appropriately (see FIG. 8A). In FIG. 8, the adjustment screw 110 and the fine adjustment mechanism 120 are not shown.

  Further, even when the central axis of the rotary drum 61 (print feed path L2) with respect to the head unit 83 is shifted due to an attachment error of the printing means 48 (the plurality of carriage units 42) with respect to the rotary drum 61, the angle adjusting means 100 performs sub By rotating the plate 95, the gap between the inkjet head 76 and the recording medium A can be adjusted. In such a case, adjustment is made so that the amount of movement of each adjustment screw 110 is different, and the angle of each sub-plate 95 is adjusted so as to be parallel to the tangent to the print feed path L2 (see FIG. 8B).

  Further, the head unit 83 of the present invention can attach the pair of sub-plates 95 in parallel to the head plate main body 94 when the head unit 83 is assembled. The mounting accuracy of the sub plate 95 with respect to 94 can be improved.

  In addition, a gap detection sensor composed of a magnetic sensor or the like is provided at the center of each sub-plate 95, and the control device (interlocking adjustment means) is the Z-axis direction of the head unit 83 (carriage 82) by the Z-axis moving mechanism 84 ( Along with the movement in the normal direction), a gap (distance) between each sub-plate 95 and the recording medium A is detected by a gap detection sensor. Based on the detection result, the adjustment screw 110 is advanced or retracted by motor drive, for example. You may make it make it. In such a case, the adjustment screw 110 adjusts so that each sub-plate 95 is parallel to the tangent to the print feed path L2.

  The angle adjustment mechanism 103 according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. The angle adjustment mechanism 103 of this embodiment does not have the torsion coil spring 111 that biases the pair of sub-plates 95 in the opening direction, and the outer end portion of the head plate main body 94 and the screw receiving portion of each sub-plate 95. 98 and only a pair of adjustment screws 110 interposed between the two. Each adjustment screw 110 has a tip contact portion 110b made of a magnet. On the other hand, the screw receiving portion 98 of each sub-plate 95 with which the tip contact portion 110b of each adjustment screw 110 contacts is made of a magnetic material having a different polarity from the tip contact portion 110b. That is, the angle adjusting mechanism 103 of this embodiment magnetically attaches the sub plate 95 to the head plate 94 by the magnetic force generated between the tip contact portion 110b of the adjustment screw 110 and the screw receiving portion 98 of the sub plate 95. Then, the angle adjustment is performed by rotating the sub-plate 95 by moving the adjustment screw 110 back and forth. Note that the tip contact portion 110b of each adjustment screw 110 and the screw receiving portion 98 of the sub plate 95 are preferably composed of a neodymium magnet or the like that generates a strong magnetic force.

  According to the drawing apparatus 1 provided with the angle adjusting mechanism 103 described so far, the gap between the inkjet head 76 and the recording medium A is appropriately set according to the change in the curvature of the print feed path L2 and the deviation of the central axis. Since the adjustment can be performed, high-precision printing can be performed on the recording medium sent along the curved surface. In addition, it is possible to provide the drawing apparatus 1 that can freely adjust the angle of the sub-plate 95 with a simple configuration.

  In the present embodiment, the angle of the pair of sub-plates 95 is individually adjusted by the two adjustment screws 110, but it may be configured to be adjustable at the same time. For example, as the angle adjustment mechanism, a pair of sub-plates 95 is made into two links, and two links arranged in a mountain shape are added to form a four-joint rotation link, and the paired portion (top) of the added two links In addition, an adjustment screw is provided in response to the head plate body 94.

  1: Drawing device 41: Medium feeding mechanism 61: Rotating drum 76: Inkjet head 83: Head unit 84: Z-axis moving mechanism 94: Head plate body 95: Sub plate 97: Hinge bearing portion 98: Screw receiving portion 100: Angle adjustment Means 101: Hinge shaft 102: L-shaped bracket 103: Angle adjustment mechanism 110: Adjustment screw 110a: Screwing portion 110b: Tip contact portion 111: Torsion coil spring A: Recording medium L2: Print feed path

Claims (9)

A recording medium feeding means for feeding the recording medium along a recording medium feeding path following the curved surface;
A plurality of print heads for printing on the recording medium to be sent;
A head plate having a pair of sub-plates configured to be connected in a mountain shape in the recording medium feeding direction along the recording medium feeding path, and on which the plurality of print heads are mounted;
An imaging apparatus comprising: an angle adjusting means for adjusting the angle of the chevron formed by the pair of sub-plates. The head plate further includes a head plate body that supports the pair of sub-plates in a suspended manner and faces a peripheral portion of the pair of sub-plates,
The angle adjusting means includes
A hinge shaft supported by the head plate main body and rotatably connecting the pair of sub-plates at a mutual abutting portion;
An angle adjustment mechanism that engages with both outer ends of the pair of sub-plates in the feeding direction and adjusts the angle by rotating the pair of sub-plates in the opening / closing direction around the hinge shaft. The drawing apparatus according to claim 1, wherein: The angle adjustment mechanism includes:
A pair of adjustment mechanisms that are interposed between the head plate body and the outer end portions of the sub-plates and that advance and retract in the direction of separating the outer end portion from the head plate body; The drawing apparatus according to claim 2, wherein: The outer end portion of each sub-plate is made of a magnetic material,
Each adjustment mechanism is
The drawing apparatus according to claim 3, wherein the drawing device is an adjusting screw that is screwed into each of the head plate bodies and at least a tip portion that abuts on the outer end portion is formed of a magnet. The angle adjusting means includes
A spring for biasing the pair of sub-plates in the opening direction around the hinge shaft;
A pair of adjustment screws that are interposed between the head plate body and the outer end portions of the sub-plates and move the outer end portions in the separating direction relative to the head plate body; The drawing apparatus according to claim 2. Separation and movement means for moving a head plate on which the plurality of print heads are mounted in a normal direction of the recording medium feed path passing through a boundary between a pair of sub-plates;
The apparatus further comprises interlocking adjusting means for adjusting the angle adjusting means so that the nozzle surface of each print head is parallel to the tangent line of the recording medium feeding path in conjunction with the separation / contact movement means. The drawing apparatus according to claim 1.   The drawing apparatus according to claim 1, wherein each of the print heads includes an inkjet head.   The drawing apparatus according to claim 1, wherein the plurality of print heads constitute one drawing line with respect to the width of the recording medium.   The drawing apparatus according to claim 1, wherein the recording medium feeding unit includes a rotating drum that feeds the recording medium in close contact with an outer peripheral surface.

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