JP2015131457A - Suction platen mechanism and droplet discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction platen mechanism capable of realizing a reduction in size of a droplet discharge device and power-saving without complicating control of the whole droplet discharge device and of causing open/close states of suction holes to be appropriate states fitting a width of a recording medium.SOLUTION: A suction platen mechanism 20 comprises: a platen 22 having a platen surface 22a provided with a plurality of suction hole rows 22c consisting of a plurality of suction holes 22b arranged in a transportation direction of a recording sheet serving as a recording medium in a width direction perpendicular to the transportation direction; a sheet discharge guide 21 serving as a width adjustment guide having sheet discharge guide members 21a and 21b movable in the width direction; suction hole lids 23 serving as suction hole opening/closing members; and suction hole lid operation means 24 serving as open/close operation means being operatively associated with movement of the sheet discharge guide members 21a and 21b in the width direction and moving the suction hole lids 23 to positions where the suction hole rows 22c are opened and closed.

Description

  The present invention relates to a suction platen mechanism and a droplet discharge device including the suction platen mechanism.

2. Description of the Related Art Conventionally, in order to transport a recording medium in close contact with a platen surface in a droplet discharge device, a suction platen that makes the recording medium adhere to the platen surface by air suction is known. The suction platen is provided with a plurality of suction holes on the platen surface, and air is exhausted from the plurality of suction holes to the outside by an intake fan, thereby generating a negative pressure and bringing the recording medium into close contact with the platen surface.
When there is a suction hole that is not blocked by the recording medium and is opened, air is sucked from the opened suction hole, and the suction pressure acting on the recording medium is reduced. For this reason, the recording medium is lifted from the platen surface, and an appropriate platen gap cannot be obtained between the droplet discharge head and the recording medium, resulting in a decrease in print quality, and the recording medium being rubbed against the droplet discharge head. As a result, there is a problem that ink smears occur.

  Thus, for example, the suction platen mechanism in the droplet discharge device of Patent Document 1 has a first suction region that is partitioned by lattice-like ribs at the approximate center in the width direction perpendicular to the conveyance direction of the platen recording paper. The bottom of the lattice-like compartment in the first suction area is a first suction hole. Moreover, it has the 2nd suction area | region in which the 2nd suction hole of the arrangement | positioning or shape different from a 1st suction hole was formed in the both sides of a 1st suction area | region. Then, the central portion in the width direction of the recording paper is sucked in the first suction area where the suction force is large, and both end portions in the width direction of the recording paper are sucked in the second suction area.

  Further, for example, as described in Patent Document 2, a printing apparatus is proposed in which an opening / closing mechanism for switching an opening / closing state of a suction hole according to a recording sheet to be conveyed is disposed between a platen and a suction mechanism. ing. The opening / closing mechanism of Patent Document 2 has a shutter plate that opens and closes suction holes for each of a plurality of suction hole rows arranged in the recording paper transport direction and the width direction orthogonal to the transport direction. Then, according to the recording paper width dimension and the recording medium conveyance state detected by the sensor, the opening and closing states of the plurality of suction holes are switched by the respective shutter plates arranged in the recording paper conveyance direction and the width direction. Is.

JP 2010-201683 A JP 2013-43313 A

  However, in the suction platen mechanism described in Patent Document 1, when sucking recording paper having a small paper width, air is sucked from the suction hole of the second suction area that is open without being covered by the recording paper. Since the suction pressure is lost, a sufficient suction pressure may not be obtained. For this reason, the recording paper is lifted from the platen surface, resulting in a problem that the printing quality is deteriorated, and the recording paper is rubbed against the droplet discharge head, thereby causing ink stains.

Further, in the printing apparatus of Patent Document 2, in order to switch the open / close state of all the suction holes in accordance with the recording paper, a space for arranging an open / close mechanism having shutter plates arranged in the transport direction and the width direction is used as the platen and the suction. Must be provided between the mechanism. Therefore, there is a problem that it is difficult to reduce the size of the applied droplet discharge device.
Further, it is necessary to add to the control flow of the entire droplet discharge apparatus motor detection for detecting the conveyance state of the recording paper by the sensor and switching the open / closed state of all the shutter plates according to the conveyance state. Therefore, as compared with a droplet discharge device that does not have a suction hole opening / closing mechanism as in Patent Document 1, there are problems that the control flow of the entire device is complicated and power consumption is increased.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  [Application Example 1] A suction platen mechanism according to this application example includes a platen surface in which a plurality of suction hole arrays including a plurality of suction holes arranged in the conveyance direction of the recording medium are provided in a width direction orthogonal to the conveyance direction. A platen having a width, a width adjusting guide having a guide member movable in the width direction, a suction hole opening / closing member, and the suction hole opening / closing member in association with movement of the guide member in the width direction. And an opening / closing operation means for moving to an opening / closing position.

According to this application example, the suction hole opening and closing member is moved in conjunction with the movement of the guide member that moves in accordance with the width of the recording medium so that the suction hole row is opened and closed. It is possible to make the suction hole open / closed suitable for the recording medium simply by adjusting to the width of.
Therefore, unlike the suction platen mechanism described in Patent Document 1, the suction holes are not always opened, and the suction hole rows in the portions necessary for sucking the recording medium are opened and the suction hole rows in the other portions are closed. Therefore, loss of suction pressure can be prevented. Further, unlike the open / close mechanism described in Patent Document 2, it is not necessary to switch the open / close state of all the suction holes, so that the number of necessary parts can be reduced and the suction platen mechanism can be downsized.

  [Application Example 2] In the suction platen mechanism according to the application example, the opening / closing operation means is arranged so as to face the suction hole row located outside the position of the guide member in the width direction. The opening / closing member is preferably moved from a first position that does not block the suction hole row to a second position that closes the suction hole row, thereby closing the suction hole row.

According to this application example, the suction hole opening / closing member corresponding to the suction hole array located outside the position in the width direction of the guide member is operated to close the suction hole array, so that a plurality of suction hole arrays are recorded. It can be opened and closed appropriately according to the width of the medium.
Therefore, unlike the opening / closing mechanism described in Patent Document 2, it is not necessary to detect the width of the recording medium and calculate the opening / closing state of the suction hole in accordance with the width of the recording medium on the droplet discharge device side. The opening / closing control of the plurality of suction holes can be simplified.

  Application Example 3 In the suction platen mechanism according to the application example described above, the width adjustment guide is formed integrally with the guide member and is engaged with the first rack and the first rack arranged in the width direction. A first rack-and-pinion including a first pinion that moves, and the opening / closing operation means contacts the suction hole opening / closing member to move the suction hole opening / closing member from the first position to the second position. It is preferable to include an opening / closing position moving member and a guide interlocking unit that moves the opening / closing position moving member in conjunction with the movement of the first rack in the width direction.

  According to this application example, the opening / closing position moving member is moved by the guide interlocking member in conjunction with the movement in the width direction of the first rack formed integrally with the two guide members. A platen mechanism can be realized.

  Application Example 4 In the suction platen mechanism according to the application example, the guide interlocking unit is formed integrally with the opening / closing position moving member, and is arranged in the width direction, and the second rack, The second rack and pinion including the second pinion to be engaged, and the movement amount of the first rack in the width direction are transmitted to the second rack and pinion, and the movement of the first rack and the second rack is transmitted. It is preferable to have an interlocking member to be interlocked.

According to this application example, since the suction hole is opened and closed in conjunction with the two rack and pinions, the suction hole can be opened and closed with only the force applied when the user moves the guide member.
Therefore, it is possible to realize a suction platen mechanism that can be switched to an open / close state of the suction hole that matches the width of the recording medium without power consumption.

  Application Example 5 In the suction platen mechanism according to the application example, the guide interlocking portion is disposed corresponding to the shaft disposed in the width direction and the suction hole opening / closing member perpendicular to the shaft. It is preferable to have a camshaft including a cam that is the opening / closing position moving member, and an interlocking member that transmits the movement of the first rack in the width direction to the camshaft.

  According to this application example, the configuration is such that the suction shaft is opened and closed by rotating the camshaft provided with the cam as the opening / closing position moving member for each suction hole opening and closing member according to the movement of the first rack. Therefore, the space required for arranging the opening / closing operation means in the transport direction can be further reduced.

  Application Example 6 In the suction platen mechanism described in the application example, it is preferable that the interlocking member is a belt member.

  According to this application example, since the first rack and pinion and the second rack and pinion or the first rack and pinion and the camshaft are interlocked with each other by the belt member, the width adjustment guide and the opening and closing are configured with a simple configuration. The operating means can be linked.

  Application Example 7 In the suction platen mechanism according to the application example described above, it is preferable that the interlocking member is a bar-like member that connects the first rack and the second rack.

  According to this application example, since the first rack and the second rack are directly connected by the bar-like member, it is possible to further reduce the number of parts necessary for the interlocking of the width adjustment guide and the opening / closing operation means.

  Application Example 8 In the suction platen mechanism according to the application example described above, the opening / closing operation unit has the other end centered on one end of the suction hole opening / closing member extending in the transport direction and the first position. It is preferable to rotationally move from to the second position.

  According to this application example, the contact area between the opening / closing position moving member and the suction hole opening / closing member necessary to move the suction hole opening / closing member to the first position can be reduced, and the suction platen mechanism can be downsized. can do.

  Application Example 9 In the suction platen mechanism described in the application example, it is preferable that the suction hole opening / closing member has a plurality of convex portions for closing the plurality of suction holes of the suction hole row.

  According to this application example, since the suction hole opening / closing member is provided with the convex portion that closes the suction hole, the suction hole can be more reliably closed.

  Application Example 10 In the suction platen mechanism according to the application example, the suction hole opening / closing member is disposed outside a position of the minimum width in the width direction of the recording medium that can be conveyed on the platen surface. It is preferable that the guide member is provided for each suction hole row, and is movable from the position of the minimum width in the width direction of the recording medium that can be conveyed on the platen surface to the position of the maximum width.

  According to this application example, it is not necessary to open and close the suction hole array provided in the region through which the recording medium having the minimum width that can be conveyed on the platen surface passes. Therefore, the number of parts required for opening and closing the suction hole can be reduced without reducing the suction pressure.

  Application Example 11 In the suction platen mechanism according to the application example, it is preferable that the width adjustment guide is provided downstream of the platen surface in the transport direction of the recording medium.

  According to this application example, it is possible to provide a suction platen mechanism suitable for a droplet discharge device to which a long recording medium is supplied.

  Application Example 12 In the suction platen mechanism according to the application example described above, it is preferable that the width adjustment guide is provided upstream of the platen surface in the transport direction of the recording medium.

  According to this application example, it is possible to provide a suction platen mechanism suitable for a droplet discharge device to which a single-sheet recording medium is supplied.

  Application Example 13 A droplet discharge device according to this application example has the suction platen mechanism described in the application example.

  According to this application example, it is possible to provide a droplet discharge device that is small in size, has low power consumption, and has excellent print quality.

FIG. 3 is an external perspective view of the roll paper printer according to the first embodiment. FIG. 2 is an external perspective view of the roll paper printer in a state where the opening / closing lid according to the first embodiment is fully opened. FIG. 2 is a schematic cross-sectional view illustrating an internal structure of the roll paper printer according to the first embodiment. FIG. 3 is a top view of the suction platen mechanism according to the first embodiment. (A) is a side view of the suction platen mechanism according to the first embodiment along S1-S1 in FIG. 4, and (b) is a side view of the suction platen mechanism according to the first embodiment along S2-S2 in FIG. The front view of the suction platen mechanism which concerns on Embodiment 1 along F1-F1 of FIG. FIG. 6A is a diagram showing the operation of the flat cam accompanying the operation of the paper discharge guide according to the first embodiment when conveying the maximum width recording paper, and FIG. The figure which shows operation | movement of the flat cam accompanying operation | movement of the paper discharge guide which concerns. (A) is a figure which shows the opening / closing operation | movement of the suction hole cover which concerns on Embodiment 1 of an open state, (b) is a figure which shows the opening / closing operation | movement of the suction hole lid which concerns on Embodiment 1 of a obstruction | occlusion state. FIG. 6 is a top view of a suction platen mechanism according to a second embodiment. (A) is a side view of the suction platen mechanism according to the second embodiment along S3-S3 in FIG. 9, and (b) is a front view of the suction platen mechanism according to the second embodiment along F2-F2 in FIG. (A) is a figure which shows the opening / closing operation | movement of the suction hole cover which concerns on Embodiment 2 of an open state, (b) is a figure which shows the opening / closing operation | movement of the suction hole lid which concerns on Embodiment 2 of a obstruction | occlusion state. (A)-(d) is a figure which shows the shape and operation | movement of a cam which concern on Embodiment 2 corresponding to the position of (1)-(4) of FIG. FIG. 10 is a top view of a suction platen mechanism according to Modification 1.

  Hereinafter, embodiments of a droplet discharge device to which the present invention is applied will be described with reference to the drawings. In the following drawings, the scale of each layer and each member is made different from the actual scale so that each layer and each member can be recognized.

(Embodiment 1)
<Droplet ejection device>
As a droplet discharge device to which the suction platen mechanism of the present invention is applied, a roll paper printer will be described as an example. This roll paper printer is, for example, a label printer that prints on roll paper by an ink jet method and cuts the paper to an arbitrary length. In particular, it is equipped with a suction platen mechanism that opens and closes the suction holes in conjunction with the movement of the paper discharge guide. When supplying roll paper, the suction hole is simply moved according to the width of the roll paper. The open / close state of can be made to be suitable for the width of the roll paper.

(overall structure)
FIG. 1 is an external perspective view of the roll paper printer 1 according to the first embodiment, and FIG. 2 is an external perspective view of the roll paper printer 1 with the opening / closing lid 3 fully opened.

  As shown in FIG. 1, the roll paper printer 1 includes a printer body 2 having a rectangular parallelepiped shape as a whole, and an opening / closing lid 3 attached to a front surface provided with operation buttons and the like of the printer body 2. . A recording paper discharge port 4 having a predetermined width is formed on the front surface of the printer body 2. A paper discharge guide 21 protrudes forward below the recording paper discharge port 4, and a lid opening / closing lever 5 is disposed on the side of the paper discharge guide 21. A rectangular opening for inserting and removing roll paper is formed below the paper discharge guide 21 and the lid opening / closing lever 5 in the printer main body 2, and this opening is sealed by the opening / closing lid 3.

  When the lid open / close lever 5 is operated, the lock of the open / close lid 3 is released. When the paper discharge guide 21 is pulled forward after unlocking, as shown in FIG. 2, the opening / closing lid 3 opens forward with the lower end as a center, and the platen 22 opens with the opening / closing lid 3 until it is almost horizontal. Then, the platen surface 22a provided on the upper surface of the platen 22 appears, and the path from the opening to the roll paper storage unit 7 formed inside the printer is opened. At the same time, the recording paper conveyance path from the roll paper storage unit 7 to the recording paper discharge port 4 is opened, and the roll paper can be easily replaced.

  FIG. 3 is a schematic cross-sectional view showing the internal structure of the roll paper printer 1. Inside the roll paper printer 1, a roll paper storage unit 7 is formed at the center in the width direction of the printer main body frame 6. The roll paper storage unit 7 stores the roll paper 8 in a horizontally placed state with the central axis of the roll paper 8 facing the width direction of the printer.

  On the upper side of the roll paper storage unit 7, a head unit frame 9 is horizontally attached to the upper end of the printer main body frame 6. A carriage guide shaft 10 is stretched horizontally across the head unit frame 9 in the width direction of the printer. A carriage 12 on which the inkjet head 11 is mounted in a downward state is capable of reciprocating along the carriage guide shaft 10 in the printer width direction. The carriage 12 is reciprocated in the printer width direction by a known carriage conveyance device, for example, a carriage conveyance mechanism including a carriage motor and a timing belt.

  A platen 22 that extends horizontally in the front-rear direction of the printer is disposed below the inkjet head 11. The platen 22 is provided with a platen surface 22a facing the inkjet head 11 with a certain gap horizontally in the printer width direction, and the printing position of the inkjet head 11 is defined by the platen surface 22a. Further, the platen 22 is connected to a paper discharge guide 21 provided in the front in the transport direction of the roll paper 8 by a timing belt 25 and constitutes a suction platen mechanism 20.

  At the rear end of the platen 22, a tension guide 13 on which a long recording paper 8 a drawn out from the roll paper storage unit 7 is bridged is disposed. The tension guide 13 is urged upward, and the recording paper 8a drawn out from the roll paper 8 stored in the roll paper storage unit 7 passes through printing in a state where a predetermined tension is applied by the tension guide 13. Is pulled out by the recording paper transport path.

  A paper feed roller 14 is stretched horizontally in the printer width direction at a position in front of the tension guide 13 in the platen 22. A paper pressing roller 15 attached to the head unit frame 9 side is pressed against the paper feeding roller 14 from above with a predetermined pressing force via the recording paper 8a. A front paper feed roller 16 is stretched horizontally in the printer width direction on a portion of the platen 22 on the front end side of the platen surface 22a. A front paper pressing roller 17 attached to the head unit frame 9 side is pressed against the front paper feed roller 16 from above via a recording paper 8a.

  The recording paper 8a drawn upward from the roll paper 8 stored in the roll paper storage unit 7 is transported along a transport path A indicated by a thick dashed line in FIG. The conveyance path A is directed upward via the space between the feeding roller 18 and the paper pressing roller 19, bent forward via the tension guide 13, and then between the paper feeding roller 14 and the paper pressing roller 15. The recording paper discharge port 4 is reached through between the head 11 and the platen surface 22 a and between the front paper feed roller 16 and the front paper pressing roller 17.

  The recording paper 8a fed out from the roll paper 8 is conveyed while being sucked by the platen surface 22a and passes through the printing position. Printing is performed by the inkjet head 11 mounted on the carriage 12 while reciprocating the carriage 12 along the carriage guide shaft 10 at the printing position. After a series of line printing in the width direction of the recording paper 8a is completed, the feeding roller 18, the paper feeding roller 14, and the front paper feeding roller 16 are synchronously rotated to feed the recording paper 8a by a predetermined pitch. . After this, the next line printing is performed. Thus, the recording paper 8a is printed by the inkjet head 11 while being intermittently sent out at a predetermined pitch. The recording paper 8a after printing is cut and discharged in the width direction by an auto cutter disposed in the recording paper discharge port 4.

<Suction platen mechanism>
FIG. 4 is a top view showing the suction platen mechanism 20 for sucking the recording paper 8a to the platen surface 22a. FIG. 5A is a side view taken along line S1-S1 of FIG. FIG. 5B is a side view taken along line S2-S2 of FIG. FIG. 6 is a front view taken along line F1-F1 in FIG. 5A and 5B are side views including a configuration along the S1-S1 line or S2-S2 line and a configuration related thereto. 4 represents the conveyance direction of the recording paper 8a, and the arrow Y represents the width direction of the recording paper 8a. Hereinafter, the conveyance direction of the recording paper 8a is referred to as the X direction, and the width direction of the recording paper 8a is referred to as the Y direction.
First, a schematic configuration of the suction platen mechanism 20 provided in the roll paper printer 1 according to the first embodiment will be described.

As shown in FIG. 4, the suction platen mechanism 20 includes a paper discharge guide 21 as a width adjustment guide, a platen 22, a suction hole lid 23, a suction hole lid operating means 24, a timing belt 25, and the like.
As shown in FIG. 4, the discharge guide 21 includes a left discharge guide member 21a and a right discharge guide member 21b as guide members, a left discharge rack 21c and a right discharge rack 21d as first racks, A paper discharge pinion 21e as a pinion is formed. Further, the paper discharge guide 21 is disposed on the downstream side in the X direction with respect to the platen 22.

  The left discharge guide member 21a and the right discharge guide member 21b are integrally formed on the outer ends in the Y direction of the left discharge rack 21c and the right discharge rack 21d. The left discharge rack 21c and the right discharge rack 21d are arranged so that the rack portion engages with the discharge pinion 21e, and constitutes a rack and pinion structure as a first rack and pinion. Further, the left discharge guide member 21a and the right discharge guide member 21b are configured such that the minimum width recording sheet 8min (see FIG. 7) from the positions of both ends in the Y direction of the maximum printable recording sheet 8max (see FIG. 7). ) To both positions in the Y direction. Hereinafter, the record paper having the maximum printable width is referred to as a record sheet 8max, and the record sheet having the minimum width is referred to as a record sheet 8min. Further, the both ends of the recording paper 8a indicate both ends in the Y direction (width direction).

  As shown in FIGS. 5A and 5B, the paper discharge pinion 21e is rotatably fixed to the upper end of the paper discharge rotation shaft 21f extending vertically downward together with the paper discharge rotation shaft 21f. A discharge interlocking gear 21g having the same shape and size as the discharge pinion 21e is fixed to the lower end of the discharge rotation shaft 21f so as to be rotatable together with the discharge rotation shaft 21f. Therefore, when the left discharge guide member 21a or the right discharge guide member 21b is moved in the Y direction, the discharge pinion 21e and the discharge interlocking gear 21g rotate in synchronization.

As shown in FIGS. 4 and 5A, 5B, the platen 22 has a flat rectangular parallelepiped shape that is long in the Y direction. As shown in FIG. 4, a plurality of suction holes 22 b _{1 to} 22 b ₃₂ are provided on the platen surface 22 a provided on the upper surface of the platen 22. The plurality of suction holes 22b _{1 to} 22b ₃₂ are divided into a plurality of suction hole rows 22c parallel to the Y direction with a plurality (four) of suction holes arranged in the X direction as a unit.

The suction holes 22b _{1 to} 22b ₃₂ communicate with a suction passage (not shown) formed in the platen 22. The rear end (upstream end in the X direction) of the platen 22 communicates with a suction passage, and the suction passage communicates with a suction hole of a suction fan (not shown) attached to the back plate of the printer body frame 6. Yes. The suction fan outlet opens to the rear of the printer. When the suction fan is driven, air is sucked from the suction holes 22b _{1 to} 22b ₃₂ through the suction passages in the platen 22. With this suction force formed by the suction fan, the recording paper 8a transported on the upper part of the platen 22 is transported while being sucked by the platen surface 22a.

Further, a suction hole lid fixing shaft 22d extending in the Y direction is spanned around the platen 22 in order to rotatably fix a plurality of suction hole lids 23 as suction hole opening / closing members. Hereinafter, the suction holes 22b _{1 to} 22b ₃₂ are collectively referred to as the suction holes 22b.

  Further, a P area shown in FIG. 4 is a printing area of the inkjet head 11. Of the four suction holes 22b constituting each suction hole row 22c, two suction holes 22b arranged on the inner side are arranged corresponding to the P region, and suction is performed together with the suction holes 22b arranged before and after the suction holes 22b. As a result, the printed portion of the recording paper 8a is brought into close contact with the platen surface 22a with high accuracy.

As shown in FIG. 4, the suction hole lid 23 as a suction hole opening / closing member is opposed to the suction hole rows 22c arranged on both ends in the Y direction excluding the region M through which the recording paper 8min (see FIG. 7) passes. A left suction hole lid 23a and a right suction hole lid 23b are provided. The left suction hole lid 23a is a suction hole lid operated by the left discharge guide member 21a, and the right suction hole cover 23b is operated by the right discharge guide member 21b.
As shown in FIGS. 5A and 5B, the left suction hole lid 23a includes a suction hole closing portion 23a ₁ , a passive portion 23a ₂ , and a connecting portion 23a ₃ . The right suction hole lid 23b includes a suction hole closing part 23b ₁ , a passive part 23b ₂ , and a connecting part 23b ₃ .

The suction hole closing portions 23a ₁ and 23b ₁ have a surface that closes the suction hole row 22c arranged to face the suction hole lid 23, and have a flat plate shape. As shown in FIG. 4, the surface that closes the suction hole row 22c is not limited to the surface of the area that closes the suction hole row 22c for one row arranged in a straight line, and the suction holes 22b are staggered. Even if the suction holes 22b such as the suction hole row 22c are sparsely arranged, they may have an area to block them.
Further, as shown in FIGS. 5A and 5B, the suction hole blocking portions 23a ₁ and 23b ₁ are formed in a columnar shape according to the position of the suction hole 22b at the position facing the surface closing the suction hole row 22c. A plurality of convex portions 23a ₄ and 23b ₄ are provided. The protrusions 23a ₄ and 23b ₄ are not limited to a columnar shape, and may be any shape that fills the gap between the suction hole 22b and the surface that closes the suction hole row 22c, such as a hemisphere, a truncated cone, or a ring shape.

The passive portions 23 a ₂ and 23 b ₂ have a flat plate shape and are in contact with the suction hole lid operating means 24. The passive portion 23b ₂ is longer than the passive portion 23a ₂ and is connected to the connecting portion 23b ₃ at a position closer to the platen surface 22a than the suction hole lid operating means 24.

The connecting portion 23a ₃ connects the suction hole closing portion 23a ₁ and the passive portion 23a ₂ , and the connecting portion 23b ₃ connects the suction hole closing portion 23b ₁ and the passive portion 23b ₂ in a substantially V shape. Further, the connecting portions 23a ₃ and 23b ₃ are fixed so as to be rotatable at each position of the suction hole row 22c in the Y direction along the suction hole lid fixing shaft 22d provided inside the platen 22 in the substantially V-shaped valley portion. Has been. The substantially V-shaped connecting portion 23a ₃ is a position on the suction hole closing portion 23a ₁ side, and the connecting portion 23b ₃ is a position on the suction hole closing portion 23b ₁ side, and elastic members 23a ₅ , 23b such as springs. _It is connected to the inner wall of the platen 22 via ₅ .

  As shown in FIG. 4, the suction hole lid operating means 24 as an opening / closing operation means for opening and closing the suction hole lid 23 is disposed downstream of the plurality of suction hole arrays 22c provided on the platen surface 22a in the X direction. Has been. The suction hole lid operating means 24 includes a left flat cam 24a and a right flat cam 24b as open / close position moving members, a left open / close rack 24c and a right open rack 24d as a second rack, and an open / close pinion 24e as a second pinion. It is comprised including.

As shown in FIG. 6, the left flat cam 24a and the right flat cam 24b have a quadrangular pyramid shape when viewed from the downstream in the X direction, with the acute angle portion facing outward in the Y direction of the platen surface 22a, It is fixed to the end of the open / close rack 24c or the right open / close rack 24d. The left flat cam 24 a has a length that allows contact with the passive portions 23 a _{2 of} all the left suction hole lids 23 a provided on the platen 22. Also, the right plane cam 24b has a length that it could come into contact with the passive portion 23b ₂ of all right suction Anafuta 23b provided on the platen 22.

  As shown in FIG. 4, the left open / close rack 24c and the right open / close rack 24d are engaged with each other with the open / close pinion 24e sandwiched between the left output rack 21c and the right discharge rack 21d. A rack and pinion structure is formed as a second rack and pinion as an example. As shown in FIGS. 5A and 5B, the opening / closing pinion 24e is fixed to the upper end of the opening / closing rotating shaft 24f extending vertically downward so as to be rotatable together with the opening / closing rotating shaft 24f. The open / close pinion 24e has the same shape and the same size as the paper discharge pinion 21e. An opening / closing interlocking gear 24g having the same shape and size as the opening / closing pinion 24e is fixed to the lower end of the opening / closing rotating shaft 24f so as to be rotatable together with the opening / closing rotating shaft 24f. The opening / closing interlocking gear 24g and the discharge interlocking gear 21g are bridged by a timing belt 25. Therefore, when the paper discharge interlocking gear 21g rotates in synchronization with the rotation of the paper discharge pinion 21e, the opening / closing interlocking gear 24g rotates.

  The timing belt 25, which is an interlocking member and is a belt member, is stretched over the discharge interlocking gear 21g and the open / close interlocking gear 24g, and the discharge guide 21 and the suction hole lid operating unit 24 to which the interlocking gears are connected. The operation of

  In the first embodiment, the paper discharge pinion 21e, the paper discharge interlocking gear 21g, the opening / closing pinion 24e, and the opening / closing interlocking gear 24g are configured by gears having the same shape and the same size. The shape and size of the gear are not limited to this. The shape and size of each gear may be a combination that can synchronize the movements of the paper discharge guide members 21a and 21b and the flat cams 24a and 24b. For example, the paper discharge pinion 21e and the opening / closing pinion 24e, and the paper discharge interlocking gear 21g and the opening / closing interlocking gear 24g may be configured by gears having the same shape and size.

Next, an outline of the opening / closing operation of the suction hole array 22c in the suction platen mechanism 20 of the roll paper printer 1 according to the first embodiment will be described with reference to FIGS.
In order to open and close the suction hole row 22c in the suction platen mechanism 20, the left flat cam 24a and the right flat cam 24b are moved in the Y direction in conjunction with the movement of the paper discharge guide 21, and the passive portion 23a ₂ of the left suction hole lid 23a or it is performed by elevating the passive portion 23b ₂ of the right suction Anafuta 23b.

First, the movement of the left flat cam 24a and the right flat cam 24b as the paper discharge guide 21 moves will be described.
FIG. 7A is a diagram illustrating a state in which the paper discharge guide 21 is matched to the width of the recording paper 8max. FIG. 7B is a diagram illustrating a state in which the paper discharge guide 21 is matched to the width of the recording paper 8 min.
In the Y direction, the left flat cam 24a is provided inside the position of the left paper discharge guide member 21a, and the right flat cam 24b is provided inside the position of the right paper discharge guide member 21b. Therefore, as shown in FIG. 7A, when the left discharge guide member 21a and the right discharge guide member 21b are moved in accordance with the recording paper 8max having the maximum width, each of the left flat cam 24a and the right flat cam 24b. Are arranged at positions corresponding to the suction hole rows 22c on both ends in the Y direction.
When the left discharge guide member 21a and the right discharge guide member 21b are moved from the state shown in FIG. 7A, the discharge pinion 21e is rotated according to the amount of movement. Then, the paper discharge guide interlocking gear 21g rotates together with the paper discharge pinion 21e, and the opening / closing interlocking gear 24g rotates in conjunction with the timing belt 25. Further, the rotation of the opening / closing interlocking gear 24g causes the opening / closing pinion 24e to rotate together with the opening / closing interlocking gear 24g.
Then, as shown in FIG. 7B, the left open / close rack 24c and the right open / close rack 24d engaged with the open / close pinion 24e move in accordance with the movement of the paper discharge guide 21. Therefore, the left flat cam 24a and the right flat cam 24b provided in the left open / close rack 24c and the right open / close rack 24d move as the left discharge guide member 21a and the right guide member 5b move. Thereby, the left flat cam 24a and the right flat cam 24b move to the center side where the suction hole lid is not provided.

  The area from the position of the left paper discharge guide member 21a to the position of the right paper discharge guide member 21b in the Y direction is a passing area of the recording paper 8a. The left flat cam 24a and the right flat cam 24b always have the recording paper 8a. It will be arranged in the passing area. Accordingly, the suction hole lids 23a and 23b that are in contact with the left flat cam 24a and the right flat cam 24b are operated so that the suction state corresponding to the maximum width of the recording paper 8max, the left flat cam 24a and the right flat cam 24b, and the suction hole are obtained. Without bringing the lids 23a and 23b into contact with each other, it is possible to switch to the suction state corresponding to the recording paper 8 min having the minimum width. Further, the suction state corresponding to the recording paper 8a having a width between the maximum width and the minimum width can be obtained.

Next, the operation of opening and closing the left suction hole lid 23a or the right suction hole lid 23b accompanying the movement of the left flat cam 24a or the right flat cam 24b will be described with respect to the left suction hole lid 23a disposed at the position S1-S1. An example will be described.
Fig.8 (a) is a figure showing the open state of the left suction-hole cover 23a arrange | positioned in the position of S1-S1 in FIG. FIG. 8B is a diagram illustrating a closed state of the left suction hole lid 23a disposed at the position of S1-S1 in FIG.

The operation when the left suction hole lid 23a shifts from the open state shown in FIG. 8A to the closed state shown in FIG. 8B will be described. As shown in FIG. 8A, in the opened left suction hole lid 23a, the passive portion 23a ₂ is pushed up by the left flat cam 24a, and the suction hole closing portion 23a ₁ does not block the suction hole row 22c. It is in the state of being in the position.
From this state, the contact is eliminated positions of passive portion 23a ₂ left plane cam 24a moves, the force pushing up the passive section 23a ₂ which has been added to the passive portion 23a ₂ of the left suction Anafuta 23a is eliminated. Then, the left suction Anafuta 23a is by the elastic force of the elastic member 23a _5, is pulled to the inner wall side of the platen 22 facing the platen surface 22a, counterclockwise in the drawing the suction Anafuta fixed shaft 22d as the rotation axis Rotate to. Therefore, by the left suction Anafuta 23a rotates counterclockwise, the suction hole closing portion 23a ₁ as shown in FIG. 8 (b) moves to a second position for closing the suction hole row 22c.

Next, the operation when the left suction hole lid 23a shifts from the closed state shown in FIG. 8B to the opened state shown in FIG. 8A will be described. As shown in FIG. 8B, in the closed suction hole lid 23a, the passive portion 23a ₂ is in contact with the upper surface of the left opening / closing rack 24c, and the suction hole closing portion 23a ₁ is in the second position. It is.
When the left plane cam 24a from this state is moved to a position in contact with the passive section 23a ₂ of the left suction Anafuta 23a, as shown in FIG. 8 (a), the passive section 23a ₂ is pushed by the upper surface of the left side plane cam 24a . Then, the left suction hole lid 23a is pushed down while rotating clockwise in the drawing with the suction hole lid fixing shaft 22d as a rotation axis, and the suction hole closing portion 23a ₁ moves to the first position, and the suction hole row 22c. Is released.
Note that the opening / closing operation of the left suction hole lid 23a has been described by taking as an example the opening / closing operation of the left suction hole lid 23a arranged at the position of the line S1-S1 in FIG. 4 by the left flat cam 24a. A similar opening / closing operation is performed on the right suction hole lid 23b.

  Accordingly, as each discharge guide member 21a, 21b moves to both ends of the recording paper 8a. By moving the left flat cam 24a or the right flat cam 24b to the area where the recording paper 8a passes and switching the opening / closing state of each suction hole lid 23, the suction hole 22b suitable for the width of the recording paper 8a is opened / closed. Can do.

As described above, according to the roll paper printer 1 according to the present embodiment, the following effects can be obtained.
According to the roll paper printer 1 according to the present embodiment, the suction platen mechanism 20 moves the left flat cam 24a and the right flat cam 24b to the recording paper as the left discharge guide member 21a and the right discharge guide member 21b move. Move to the area where 8a passes. The left flat cam 24a and right flat cam 24b that have been moved come into contact with the passive portions 23a ₂ and 23b _{2 of the} suction hole lids 23. As a result, the suction hole lid 23 arranged in the region through which the recording paper 8a passes is opened. Further, when the left flat cam 24a and the right flat cam 24b do not come into contact with the passive portions 23a ₂ and 23b _{2 of the} respective suction hole lids 23, the suction hole lids 23 arranged in the areas where the recording paper 8a does not pass are closed. Become. Therefore, the opening / closing state of the suction hole 22b provided in the platen surface 22a is made to match the width of the recording paper 8a only by aligning the left paper discharging guide member 21a and the right paper discharging guide member 21b with both ends of the recording paper 8a. It is possible to prevent the loss of suction pressure as in the suction platen mechanism described in Patent Document 1.

  Further, the suction hole lids 23a and 23b are suction hole arrays arranged on both end sides in the width direction other than the region M through which the recording paper 8min having the minimum width passes among the plurality of suction holes 22b provided on the platen surface 22a. 22c is provided. Therefore, since it is not necessary to switch the open / closed state of all the suction holes 22b, the number of parts required for opening / closing the suction holes 22b can be reduced as compared with the open / close device described in Patent Document 2, and the small roll paper printer 1 can be reduced. Can be realized.

  Further, according to the roll paper printer 1 according to the present embodiment, the suction platen mechanism 20 includes the timing belt as an interlocking member between the paper discharge guide 21 having a rack and pinion structure and the pinion of the suction hole lid operating means 24. 25 is laid over. That is, the suction hole 22b is opened and closed mechanically in conjunction with the movement of the guide members 21a and 21b in the width direction. Therefore, the opening / closing state of the suction hole 22b can be adjusted to the width of the roll paper 8 simply by moving the guide members 21a and 21b of the paper discharge guide 21 in accordance with the recording paper 8a. Therefore, as in the printing apparatus described in Patent Document 2, the control flow of the entire printing apparatus is complicated due to an increase in power consumption associated with driving of a motor and a sensor related to opening and closing of the suction holes and addition of an opening and closing control flow of the suction holes. Can be prevented.

  In the roll paper printer 1 according to the present embodiment, the suction platen mechanism 20 opens and closes the suction holes 22b in conjunction with the paper discharge guide 21 disposed in front of the platen 22 in the X direction. Therefore, if a part of the roll paper 8 set in the roll paper storage unit 7 is pulled out to the paper discharge guide 21 and the positions of the guide members 21a and 21b of the paper discharge guide 21 are adjusted according to the width of the recording paper 8a, the roll Each time the paper 8 is set, the open / close state of the suction hole 22b can be made suitable for the width of the recording paper 8a (roll paper 8).

(Embodiment 2)
Next, the suction platen mechanism of Embodiment 2 and the roll paper printer applied thereto will be described.
In this embodiment, the suction platen mechanism 30 is applied to the roll paper printer 1 described in the first embodiment.
FIG. 9 is a top view illustrating the structure of the suction platen mechanism 30 of the roll paper printer 1 according to the second embodiment. FIG. 10A is a side view taken along line S3-S3 showing the structure of the suction platen mechanism 30 of the roll paper printer 1 according to the second embodiment. FIG. 10B is a front view taken along line F2-F2 illustrating the structure of the suction platen mechanism 30 of the roll paper printer 1 according to the second embodiment. FIG. 10A is a side view including a configuration along the line S3-S3 and a configuration related thereto.
The suction platen mechanism 30 of the roll paper printer 1 according to this embodiment will be described with reference to these drawings. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

As shown in FIG. 9, the suction platen mechanism 30 includes a paper discharge guide 21, a platen 22, a suction hole lid 33, a camshaft drive unit 34, a timing belt 25, and the like.
As shown in FIG. 9, the suction hole lid 33 as the suction hole opening / closing member has a suction hole lid 33 with respect to the suction hole rows 22 c arranged on both ends in the Y direction excluding the region M through which the recording paper 8 min passes. Is provided. Further, as shown in FIG. 10A, the suction hole lid 33 has a rectangular parallelepiped shape, and the suction hole row 22c in the Y direction along the suction hole lid fixing shaft 22d provided in the platen 22 is provided. Each position is fixed so as to be rotatable about the upstream end in the X direction. The suction hole lid 33 has a convex portion 33a on the upper surface facing the suction hole row 22c in accordance with the positions of the plurality of suction holes 22b constituting the suction hole row 22c, and is substantially centered in the X direction on the lower surface. This portion is in contact with the camshaft drive means 34.

  As shown in FIG. 10B, the camshaft driving means 34 which is an opening / closing operation means of the suction hole lid 33 and is a guide interlocking portion includes cams 34a to 34c as opening / closing position moving members, and a camshaft as a shaft. The shaft 34d, the camshaft rotating gear 34e, the camshaft driving gear 34f, the camshaft interlocking shaft 34g, the camshaft interlocking gear 34h, and the like are included.

  The cams 34a to 34c are fixed to a camshaft shaft 34d that is a rotation shaft, and each discharge guide member 21a, 21b is moved from the position of both ends of the recording paper 8max to the position of both ends of the recording paper 8min. Rotate once. Further, the cams 34a to 34c have a first radius as viewed from the direction along the camshaft shaft 34d, a quarter circle, a semicircle, a quarter circle, and the first radius. The shape is a combination of a circle having a small second radius (see FIG. 12). In addition, the cams 34 a to 34 c are disposed at positions that come into contact with the lower surface of the suction hole lid 33.

  A camshaft rotating gear 34e is fixed to the camshaft shaft 34d. The cams 34a to 34c are fixed to the camshaft shaft 34d corresponding to the positions of the suction hole lids 33 arranged in the Y direction, and constitute camshafts. Therefore, the cams 34a to 34c rotate in synchronization with the rotation of the camshaft rotation gear 34e.

  The camshaft rotation gear 34e is engaged with a camshaft drive gear 34f fixed to the upper end of a camshaft interlocking shaft 34g orthogonal to the camshaft shaft 34d. The camshaft rotation gear 34e and the camshaft drive gear 34f are arranged so that when the paper discharge guide members 21a and 21b move from the positions at both ends of the recording paper 8max to the positions at both ends of the recording paper 8min, It is a bevel gear having a gear ratio to be rotated.

  The camshaft interlocking shaft 34g has a camshaft interlocking gear 34h having the same shape and size as the discharge guide interlocking gear 21g fixed to the lower end. The camshaft interlocking gear 34h and the discharge interlocking gear 21g are bridged by the timing belt 25. Therefore, when the discharge guide interlocking gear 21g rotates in synchronization with the rotation of the discharge pinion 21e, the camshaft interlocking gear 34h rotates.

An outline of the opening / closing operation of the suction hole array 22c in the suction platen mechanism 30 of the roll paper printer 1 according to the second embodiment will be described with reference to FIGS. In order to open and close the suction hole row 22c in the suction platen mechanism 30, the suction hole lid 33 is moved up and down by rotating the cams 34a to 34c provided on the camshaft shaft 34d in conjunction with the movement of the respective paper discharge guide members 21a and 21b. Is done.
Fig.11 (a) is an open state side view of the suction hole cover 33 arrange | positioned in the position of the S3-S3 line | wire in FIG. FIG. 11B is a side view showing a closed state of the suction hole lid 33 disposed at the position of the line S3-S3 in FIG. 12A to 12D are views showing the states of the cams 34a to 34c when the respective paper discharge guide members 21a and 21b are located at the positions (1) to (4) shown in FIG. It is.

First, the opening / closing of the suction hole array 22c accompanying the lifting / lowering operation of the suction hole lid 33 by the cams 34a to 34c will be described. Hereinafter, the suction hole lid 33 arranged at the position of the line S3-S3 in FIG. 9 will be described as an example.
As shown in FIG. 11 (a), the suction Anafuta 33 in an open state does not block the suction hole row 22c in contact with the circle radius is small cam 34a (suction holes 22b (22b ₂₁ ~22b ₂₄₎₎ Arranged in the first position. From this state, when each of the paper discharge guide members 21a and 21b is moved and the cam 34a rotates clockwise in the drawing, the radius of the lower surface of the suction hole lid 33 and the cam 34a becomes as shown in FIG. A large arc will come into contact. Therefore, the suction Anafuta 33 is lifted by the cam 34a, and rotates clockwise in the drawing around the suction Anafuta fixed shaft 22 d, close the suction hole row 22c (suction holes 22b (22b ₂₁ ~22b ₂₄₎₎ Move to the second position.

Further, as shown in FIG. 11B, the suction hole lid 33 in the closed state has the suction hole lid 33 when the respective paper discharge guide members 21a and 21b are moved and the cam 34a rotates counterclockwise on the drawing. The portion that comes into contact with the arc changes from a circular arc with a large radius of the cam 34a to a circle with a small radius. Therefore, the suction hole lid 33 rotates counterclockwise on the drawing around the suction hole lid fixing shaft 22d, moves to the first position where the suction hole row 22c is not blocked, and the suction holes 22b (22b _21). ~22b ₂₄₎ to open the.

  Note that the opening / closing operation of the suction hole lid 33 has been described by taking as an example the opening / closing operation of the suction hole lid 33 arranged at the position of the line S3-S3 in FIG. 9 by the cam 34a. A similar opening / closing operation is also performed for 33 according to the shape of the cam.

  Next, the cams 34a to 34a when the paper discharge guide members 21a and 21b move from (1) in FIG. 9 which is the positions at both ends of the recording paper 8max to (4) in FIG. 9 which are the positions at both ends of the recording paper 8min. The operation of 34c will be described.

  As shown in FIG. 12 (a), when each of the paper discharge guide members 21a and 21b is at the position (1) in FIG. 9, the cams 34a to 34c have a radius in order to open all the suction hole rows 22c. Is in contact with the suction hole lid 33 at the end of the large arc. Therefore, the suction hole lid 33 is tilted, and all the suction hole rows 22c on the platen surface 22a are opened. From this state, when each of the paper discharge guide members 21a and 21b is moved to the position (2) in FIG. 9 which is one row inside the suction hole row 22c in the Y direction, the cams 34a to 34c are clocked on the drawing. Rotates around to the state shown in FIG.

  As shown in FIG. 12B, when each of the paper discharge guide members 21a and 21b is moved to the position shown in FIG. 9B, the cam 34c arranged on the outermost side in the Y direction rotates clockwise. As a result, the arc having a large radius comes into contact with the suction hole lid 33 and pushes up the suction hole lid 33. For this reason, the suction hole row 22c located outside the discharge guide members 21a and 21b in the Y direction is closed. The cams 34a and 34b also rotate clockwise in the same manner as the cam 34c. However, since the circles with small radii of the cams 34a and 34b are in contact with the suction hole lid 33, the corresponding suction hole row 22c is in an open state. Is maintained. From this state, when each of the paper discharge guide members 21a and 21b is further moved to the position (3) in FIG. 9 which is inward by one row of the suction hole row 22c in the Y direction, the cams 34a to 34c are further illustrated on the drawing. Rotate clockwise to enter the state shown in FIG.

  As shown in FIG. 12 (c), when each of the paper discharge guide members 21a and 21b is moved to the position of (3) in FIG. 9, the cam 34b arranged second from the outside in the Y direction further moves the clock. By rotating around, an arc having a large radius comes into contact with the suction hole cover 33 and pushes up the suction hole cover 33. Therefore, the two suction hole rows 22c positioned outside the respective paper discharge guide members 21a and 21b in the Y direction are closed. Further, the cam 34a and the cam 34c also rotate clockwise in the same manner as the cam 34b. However, since the cam 34a is in a state where a circle with a small radius is in contact with the suction hole lid 33, the corresponding suction hole row 22c is kept open. Further, since the cam 34c is in a state in which the suction hole lid 33 is pushed up by an arc having a large radius, the corresponding suction hole row 22c is kept closed. From this state, when each of the paper discharge guide members 21a and 21b is further moved to the position (4) in FIG. 9 which is one row inside the suction hole row 22c in the Y direction, the cams 34a to 34c are further illustrated on the drawing. Rotate clockwise to enter the state shown in FIG.

  As shown in FIG. 12D, when each of the paper discharge guide members 21a and 21b is moved to the position of (4) in FIG. 9, the cam 34a arranged on the innermost side in the Y direction further rotates clockwise. By rotating, the suction hole lid 33 is pushed up by an arc having a large radius. Further, since the corresponding suction hole lids 33 are kept pushed up by the arcs with large radii of the cams 34b and 34c, all the suction hole lids 33 are closed, and the areas other than the region M through which the recording paper 8min passes are maintained. All the suction hole arrays 22c are closed.

  Accordingly, the cams 34a to 34c having different shapes rotate as the discharge guide members 21a and 21b move to both ends of the recording paper 8a, and the contact state with the suction hole lids 33 is switched. It is possible to switch to the open / close state of the suction hole 22b suitable for the width of 8a.

As described above, according to the roll paper printer 1 according to the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
According to the roll paper printer 1 according to the present embodiment, in the suction platen mechanism 30, the camshaft drive means 34 that switches between opening and closing of the suction hole lid 33 is included in the region of the suction hole row 22c provided on the platen surface 22a. The suction hole lid 33 is provided on the lower side. Therefore, the opening / closing state of the suction holes 22b is made suitable for the width of the roll paper 8 without making the size of the platen 22 larger than the area where the suction hole row 22c provided on the platen surface 22a is arranged. be able to. Therefore, a further compact roll paper printer 1 can be realized.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
FIG. 13 is a diagram illustrating the structure of the suction platen mechanism 40 according to the first modification.
In the first embodiment, as shown in FIG. 4, the timing belt 25 is bridged between the paper discharge guide 21 and the suction hole lid operating means 24, and the paper ejection guide 21 and the suction hole lid operating means 24 are mechanically connected. Although the configuration is described as being interlocked, it is not limited to this configuration.
Hereinafter, the suction platen mechanism 40 of the roll paper printer 1 according to Modification 1 will be described. In addition, about the component same as Embodiment 1, the same number is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 13, rod-shaped connecting members (bar-shaped members) 45 are provided between the left discharge rack 21c and the left open / close rack 24c and between the right discharge rack 21d and the right open / close rack 24d. . Therefore, when the left discharge rack 21c is moved, the left opening / closing rack 24c is moved, and when the right discharge rack 21d is moved, the right opening / closing rack 24d is moved synchronously. Done.

As described above, according to the roll paper printer 1 according to the first modification, in addition to the effects in the first embodiment, the following effects can be obtained.
According to the roll paper printer 1 according to this modification, the connecting member 45 is provided between the left discharge rack 21c and the left open / close rack 24c, and between the right discharge rack 21d and the right open / close rack 24d. It was configured to be interlocked with the hole lid operating means 24. Therefore, the suction hole 22b can be opened and closed without using the paper discharge rotating shaft 21f, the paper discharge interlocking gear 21g, the opening / closing rotating shaft 24f, the opening / closing interlocking gear 24g, and the timing belt 25 which are necessary for the interlocking of the two. Therefore, the number of parts can be further reduced, and a small roll paper printer 1 can be realized.

(Modification 2)
In the above-described embodiment and modification, the configuration of the suction platen mechanism that opens and closes the suction hole row 22c in accordance with the movement of the paper discharge guide members 21a and 21b has been described, but the present invention is not limited to this. For example, the open / close state of the suction hole array 22c may be switched in accordance with the movement of the paper feed guide member provided in the paper feed guide provided upstream in the conveyance direction of the recording paper. In this way, even in a printer that supplies recording paper from the upstream in the transport direction, the suction hole 22b can be opened and closed appropriately for the width of the fed recording paper each time paper is fed. .

(Modification 3)
In the above-described embodiment and the modification, the discharge guide members 21a and 21b are moved in accordance with both ends of the printable recording paper, and the suction hole row 22c is opened and closed according to the positions of the discharge guide members 21a and 21b. However, the present invention is not limited to this. For example, a guide wall that is fixed to the platen surface 22a along the X direction and guides one end of the recording paper 8a in the Y direction, and a guide member that moves from the guide wall in the Y direction according to the width of the recording paper. The opening / closing state of the suction hole 22b may be switched in conjunction with the above. Even if it does in this way, the same effect as the above can be acquired. That is, the number of guide members movable in the width direction is not limited to two, and may be one.

(Modification 4)
In the above-described embodiment and modification, the recording paper 8a is sucked with a constant suction force formed by driving the suction fan. However, the recording paper 8a is formed by driving the suction fan according to the open / closed state of the suction hole row 22c. The suction force applied may be adjusted. In this way, the recording paper 8a can be sucked with an appropriate suction force in accordance with the width of the recording paper 8a to be conveyed. Therefore, the power consumption required for driving the suction fan for each width of the recording paper 8a can be minimized, and the power consumption of the entire roll paper printer 1 can be further reduced.

DESCRIPTION OF SYMBOLS 1 ... Roll paper printer, 2 ... Printer main body, 3 ... Opening / closing lid, 4 ... Recording paper discharge port, 5 ... Cover opening / closing lever, 6 ... Printer main body frame, 7 ... Roll paper storage part, 8 ... Roll paper, 8a ... Recording Paper: 8max: Recording paper with maximum printable width, 8 min ... Recording paper with minimum printable width, 9 ... Head unit frame, 10 ... Carriage guide shaft, 11 ... Inkjet head, 12 ... Carriage, 13 ... Tension guide, DESCRIPTION OF SYMBOLS 14 ... Paper feed roller, 15 ... Paper pressing roller, 16 ... Front side paper feeding roller, 17 ... Front side paper pressing roller, 18 ... Feeding roller, 19 ... Paper pressing roller, 20 ... Suction platen mechanism of Embodiment 1, 21 ... Exhaust Paper guide, 21a ... Left side discharge guide member, 21b ... Right side discharge guide member, 21c ... Left side discharge rack, 21d ... Right side discharge rack , 21e ... paper discharge pinion, 21f ... paper discharge rotating shaft, 21g ... paper discharge interlocking gear, 22 ... platen, 22a ... platen surface, 22b ... suction hole, 22c ... suction hole row, 22d ... suction hole lid fixing shaft, 23 ... Suction hole cover, 23a ... Left suction hole cover, 23a ₁ ... Suction hole blockage part, 23a ₂ ... Passive part, 23a ₃ ... Connecting part, 23a ₄ ... Convex part, 23a ₅ ... Elastic member, 23b ... Right suction hole cover , 23b ₁ ... suction hole closing part, 23b ₂ ... passive part, 23b ₃ ... connecting part, 23b ₄ ... convex part, 23b ₅ ... elastic member, 24 ... suction hole lid operating means, 24a ... left flat cam, 24b ... right side Flat cam, 24c ... left open / close rack, 24d ... right open / close rack, 24e ... open / close pinion, 24f ... open / close rotating shaft, 24g ... open / close interlocking gear, 25 ... timing belt, 30 ... suction platen mechanism of embodiment 2, 33 ... suction Hole cap, 3a ... convex portion, 34 ... camshaft drive means, 34a to 34c ... cam, 34d ... camshaft shaft, 34e ... camshaft rotation gear, 34f ... camshaft drive gear, 34g ... camshaft interlocking shaft, 34h ... camshaft interlocking Gears 40... Suction platen mechanism of Modification 1 45. Connection member (bar-shaped member).

Claims (13)

A platen having a platen surface in which a plurality of suction hole arrays composed of a plurality of suction holes arranged in the transport direction of the recording medium are provided in a width direction perpendicular to the transport direction;
A width adjusting guide having a guide member movable in the width direction;
A suction hole opening and closing member;
Opening and closing operation means for moving the suction hole opening and closing member to a position for opening and closing the suction hole row in conjunction with movement of the guide member in the width direction;
A suction platen mechanism characterized by comprising:   The opening / closing operation means does not block the suction hole row with the suction hole opening / closing member disposed to face the suction hole row located outside the position of the guide member in the width direction. 2. The suction platen mechanism according to claim 1, wherein the suction platen mechanism is moved from a position to a second position where the suction hole row is closed to close the suction hole row. The width adjustment guide has a first rack and pinion formed integrally with the guide member and including a first rack disposed in the width direction and a first pinion engaged with the first rack,
The opening / closing operation means is an opening / closing position moving member that contacts the suction hole opening / closing member and moves the suction hole opening / closing member from the first position to the second position;
A guide interlocking unit that moves the opening / closing position moving member in conjunction with the movement in the width direction of the first rack;
The suction platen mechanism according to claim 1 or 2, further comprising: The guide interlocking portion is formed integrally with the opening / closing position moving member, and includes a second rack and a pinion that includes a second rack disposed in the width direction and a second pinion that engages with the second rack;
An interlocking member for transmitting a movement amount of the first rack in the width direction to the second rack and pinion, and interlocking movements of the first rack and the second rack;
The suction platen mechanism according to claim 3, wherein The guide interlocking portion includes a shaft disposed in the width direction, and a camshaft including a cam that is the opening / closing position moving member that is disposed orthogonal to the shaft and corresponding to the suction hole opening / closing member;
An interlocking member that transmits the movement of the first rack in the width direction to the camshaft;
The suction platen mechanism according to claim 3, wherein   The suction platen mechanism according to claim 4 or 5, wherein the interlocking member is a belt member.   The suction platen mechanism according to claim 4, wherein the interlocking member is a rod-shaped member that connects the first rack and the second rack.   The opening / closing means rotates the other end from the first position to the second position around one end of the suction hole opening / closing member extending in the transport direction. Item 8. The suction platen mechanism according to any one of Items 2 to 7.   The suction platen mechanism according to any one of claims 1 to 8, wherein the suction hole opening / closing member has a plurality of protrusions for closing the plurality of suction holes of the suction hole row. The suction hole opening / closing member is provided for each suction hole row disposed outside the position of the minimum width in the width direction of the recording medium that can be conveyed on the platen surface,
10. The guide member according to claim 1, wherein the guide member is movable from a minimum width position to a maximum width position in the width direction of the recording medium that can be conveyed on the platen surface. The suction platen mechanism described in 1.   11. The suction platen mechanism according to claim 1, wherein the width adjustment guide is provided downstream of the platen surface in the transport direction of the recording medium.   The suction platen mechanism according to any one of claims 1 to 10, wherein the width adjustment guide is provided upstream of the platen surface in the transport direction of the recording medium.   A liquid droplet ejection apparatus comprising the suction platen mechanism according to claim 1.

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