JP2009090582A - Cleaning unit and printer equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently clean a platen roller of a printer. <P>SOLUTION: The cleaning unit UC is attached to a main unit in place of a removal unit for an intermediate transfer sheet. A cam 56 is turned by means of turning an arm UP/DOWN lever 54, and an arm 50 is turned from an UP position to a DOWN position by means of the cam 56, to thus bring a cleaning pad 52 on a leading end of the arm 50 into contact with a platen roller 37 and perform cleaning operation. The arm UP/DOWN lever 54 is released from a locked state and turning action thereof is allowed by a link mechanism 62 by attachment of the cleaning unit UC to the main body unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cleaning unit and a printing apparatus including the same, and more particularly to cleaning of a platen roller for printing an image on a medium.

  Conventionally, a printing apparatus for printing a desired image (label print) on a medium surface such as a CD or a DVD is known. In such a printing apparatus, when a full-color image is transferred to an intermediate transfer sheet using a platen roller, and the intermediate transfer sheet is printed in close contact with the label surface of the medium, the platen roller is periodically cleaned. Need arises.

Normally, when the platen roller is cleaned, the following procedure is used.
(1) Set to cleaning mode on the operation panel of the apparatus (2) Open the apparatus door and remove the intermediate transfer sheet attachment / detachment unit (ribbon cartridge) (3) Rotate the platen roller on the operation panel of the apparatus (4) Press the cleaning plate soaked with droplet cleaning liquid against the platen roller, and slowly move it back and forth several times to wipe off the dirt. (5) Stop the platen roller and reattach the intermediate transfer sheet attachment / detachment unit.

  Patent Document 1 shown below describes the basic configuration of a printing apparatus. In Patent Document 2, the ink ribbon is provided with a plurality of color-impregnated ink impregnation zones and a cleaning zone, and the ink adhering to the ribbon mask that partitions the ink ribbon and the paper is removed in the ink ribbon cleaning zone. It is described that it is wiped off. Patent Document 3 describes that the print head is cleaned by incorporating a cleaning tape in the cartridge case instead of an ink ribbon and mounting it in a printer as it is. Patent Document 4 describes a cleaning cassette for storing a cleaning tape in which Japanese paper or Japanese paper is thinly bonded to both surfaces of a synthetic resin film and formed into a tape shape. The cleaning cassette is set in a thermal printer and wound. It describes that dust and dirt on a print head and a platen roller are removed by winding a cleaning tape with a take-up reel. Patent Document 5 describes a cleaning cassette provided with a cleaning sheet that cleans the surface of the thermal head and the platen roller by running the thermal head between the platen roller and the thermal cassette.

JP-A-2005-132048 JP-A-5-104841 JP-A-7-1809 Japanese Patent Laid-Open No. 10-76738 JP 2005-306007 A

  In the method of cleaning the platen roller by inserting the cleaning plate, it is necessary to insert it while paying attention to the structure around the platen roller, and the workability is low. In addition, the platen roller may be damaged. Furthermore, there may be a difference between individuals in the cleaning effect.

  An object of the present invention is to efficiently clean a platen roller of a printing apparatus.

  The present invention includes a platen roller for transferring a print image to a sheet, a main body unit including a transfer roller for closely attaching the sheet on which the print image is transferred to a medium, and positioned and attached to the main body unit, A cleaning unit of a printing apparatus having an attachment / detachment unit for supplying the sheet to the platen roller, wherein the cleaning unit has substantially the same external shape as the attachment / detachment unit, and is attached to the main body unit instead of the attachment / detachment unit. An arm that can be positioned and mounted relative to the platen roller when positioned and mounted, and is rotatable between a first position and a second position around a support shaft that is cantilevered. A cleaning pad provided at the tip of the arm, and a rotating shaft provided around the rotating shaft. A cam that contacts the arm and pivots the arm from the first position to the second position, and biases the arm to the first position to return the arm from the second position to the first position. The cleaning pad is separated from the platen roller when the arm is in the first position by the cam, and the cleaning pad is moved when the arm is rotated to the second position by the cam. Is in contact with the platen roller.

  In one embodiment of the present invention, an arm lever provided on the rotation shaft and capable of being rotated is provided, and the cam is rotated by rotating the arm lever so that the arm is moved from the first position. Turn to the second position.

  Further, in another embodiment of the present invention, a pin projecting from the rotating shaft and a pin that is movably provided along the rotating shaft and is sandwiched between the pins without being attached to the main unit. The arm lever is located on both sides to restrict the rotation of the arm lever, and moves along the rotation axis by being engaged with the main body unit in a state of being mounted on the main body unit, so that the arm lever is separated from the pin. And a link mechanism having a pair of claw portions that allow rotation of the.

  In the present invention, the platen roller can be cleaned by mounting the cleaning unit on the main unit and rotating the arm from the first position to the second position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Overall configuration>
First, the overall configuration of the present embodiment will be described. 7 and 8 show the overall configuration of the printing apparatus according to the present embodiment. The overall configuration is the same as the configuration disclosed in JP-A-2005-132048. The printing apparatus 100 is manufactured so that a first attachment / detachment unit U1 including an ink ribbon cassette, a second attachment / detachment unit U2 including an intermediate transfer sheet cassette, and a first attachment / detachment unit U1 and a second attachment / detachment unit U2 are detachable. It is comprised from the main body unit U5.

  The main unit U5 includes a chassis 1 in which a support plate 2 stands on the rear side, and a head unit U3 and a pinch roller unit U4 are cantilevered and attached to the front side of the support plate 2. The chassis 1 is equipped with an image transfer means 4 and a substrate transport means 5. The substrate transfer means 5 has a tray 6 movably installed on the lower side of the image transfer means 4, and a substrate M such as a CD or a DVD mounted on the tray 6 is placed under the image transfer means 4 from the right side of the apparatus. It is provided so that it can be taken out to the right side of the apparatus after being transferred to and transferred to an image.

  The first detachable unit U1 includes a front side plate 7, a back side plate 8, an ink ribbon delivery bobbin 9 and an ink ribbon take-up bobbin 10 that are rotatably mounted between them, and a head unit U3. By sliding and pushing in the direction of the arrow in FIG. 8 as a guide, the rear support plate 2 side is positioned by contacting the convex portion 11 formed to protrude in the vertical and horizontal directions on the support plate 2 side of the head unit U3. Two upper and lower engagement fixing bosses 15A and 15B (not visible in the drawing) provided on the front side plate 14 of the head unit U3 are inserted into the upper and lower three engagement fixing holes 13A, 13B and 13C. The engaging and fixing bosses 15C (not visible in the drawing) provided on the front portion of the chassis 1 are respectively fitted to position the front side. When positioned and supported in this way, the upper and lower circular recesses formed behind the ink ribbon delivery bobbin 9 and the rear circular recesses of the ink ribbon take-up bobbin 10 project in a hook shape on the front side of the support plate 2. The two rotary shafts (in FIG. 8, the upper rotary shaft 16A is shown) are fitted to the main unit U5. The lower rotating shaft is driven by a motor (not shown), the lower ink ribbon winding bobbin 10 is driven to rotate, and the ink ribbon S1 wound around the ink ribbon delivery bobbin 9 by the rotating ink ribbon winding bobbin 10 is driven. Is wound around the ink ribbon winding bobbin 10 via the head unit U3 by a plurality of guide rollers.

  The second detachable unit U2 includes a front side plate 17, a back side plate 18, an intermediate transfer sheet delivery bobbin 19 and an intermediate transfer sheet take-up bobbin 20 that are rotatably mounted between the left and right sides. By engaging the transfer means 4 in the direction of the arrow in FIG. 8 with the transfer means 4 as a guide, the engagement fixing hole (not shown) provided in the back side plate 18 is provided on the front side of the support plate 2. The boss 22 is fitted and the rear support plate 2 side is positioned, and is provided on the front side plate 24 of the image transfer means 4 in the left and right engagement fixing holes 23A and 23B formed in the center portion of the front side plate 17. The left and right two engaging and fixing bosses 25A and 25B are fitted, and the upper and lower two engaging and fixing holes 26A and 26B provided on the left side and the upper and lower two provided on the front side plate 27 of the pinch roller unit U4. Engagement locks 28A and 28B are fitted, and further, an engagement fixing hole 29 formed in the lower right portion and an engagement fixing boss 30 on the front side of the front support plate 3 provided in the chassis 1 are fitted together to move forward. The side is positioned. When positioned and supported in this manner, a circular recess at the rear of the intermediate transfer sheet delivery bobbin 19 and a circular recess at the rear of the intermediate transfer sheet take-up bobbin 20 are formed so as to project in a bowl shape on the front side of the support plate 2. The left and right rotating shafts 31A and 31B are fitted to each other and attached to the main unit U5. The two right and left rotating shafts 31A and 31B are appropriately driven by the selective driving of two motors (not shown), and the intermediate transfer sheet S2 wound around the intermediate transfer sheet delivery bobbin 19 is pinched by a plurality of guide rollers to a pinch roller unit U4. The intermediate transfer sheet take-up bobbin 20 can be wound up via the image transfer means 4, and conversely, the intermediate transfer sheet take-up bobbin 20 can be rewound onto the intermediate transfer sheet delivery bobbin 19.

  A unit fixing means 33 is pivotally attached to the front side plate 14 of the head unit U3 by a support shaft 34 so as to be rotatable in a vertical plane. The unit fixing means 33 is provided with an operating handle 33C. When the first attaching / detaching unit U1 and the second attaching / detaching unit U2 are mounted on the main unit U5, the unit fixing means 33 is turned clockwise to lie down, and the recess 33A and the boss 36 are fitted to each other. The unit U3 and the pinch roller unit U4 are connected via the unit fixing means 33, and the first attaching / detaching unit U1 and the front side plate 7 are pressed by the left end side of the unit fixing means 33, so that the second attaching / detaching unit U2 The front side plate 17 is pressed by the right end of the unit fixing means 33, and the first detachable unit U1 and the second detachable unit U2 are prevented from coming out of the main unit U5 forward. On the other hand, when the unit fixing means 33 is turned counterclockwise to stand, the first attaching / detaching unit U1 and the second attaching / detaching unit U2 can be attached to and detached from the main unit U5.

  In such a configuration, the ink ribbon S1 taken up from the ink ribbon delivery bobbin 9 to the ink ribbon take-up bobbin 10 is guided by the plurality of guide rollers and passes through the head unit U3. Further, the intermediate transfer sheet S2 wound around the intermediate transfer sheet take-up bobbin 20 from the intermediate transfer sheet delivery bobbin 19 is guided by a plurality of guide rollers, and passes through the pinch roller unit U4 and the image transfer means 4.

  When the pinch roller unit U4 is rotated to the platen roller 37 side of the image transfer means 4, the intermediate transfer sheet S2 comes into close contact with the platen roller 37 by the action of the two pinch rollers. The ink ribbon S1 is in close contact with the left side of the intermediate transfer sheet S2 that is in close contact with the platen roller 37. In this state, the heat generating elements of the thermal head of the head unit U3 are selectively heated to melt the ink on the ink ribbon S1. An image is obtained by being transferred to the intermediate transfer sheet S2. For example, black, cyan, magenta, and yellow single color inks are repeatedly arranged in this order in the longitudinal direction on the ink ribbon S1, the ink ribbon S1 is sequentially fed in the arrow direction, and the intermediate transfer sheet S2 is fed from the ink ribbon S1. Each time the single color ink is transferred, it is rewound to the intermediate transfer sheet delivery bobbin 19 side, and each time the next single color ink is transferred to the same image forming area while being wound around the intermediate transfer sheet take-up bobbin 20 side. A full-color image is formed on the intermediate transfer sheet S2 by sequentially transferring the four colors of single color ink. Then, the image transfer roller 40 of the image transfer means 4 provided with a heat generating means is cured, and the intermediate transfer sheet S2 and the substrate M are moved at the same speed while the intermediate transfer sheet S2 is brought into close contact with the substrate M on the tray 6. By moving, the full color image formed on the intermediate transfer sheet S2 is transferred to the printing material M, and printing (label printing) on the printing material M is performed.

<Cleaning unit>
When cleaning the platen roller 37 of the image transfer means 4, the second detachable unit U2 is extracted, and a cleaning unit (cleaning cartridge) UC is attached to the main unit U5 instead of the second detachable unit U2. The cleaning unit UC has an outer appearance substantially the same as that of the second detachable unit U2, and, like the second detachable unit U2, includes a front side plate and a back side plate, and pushes the image transfer means 4 as a guide. Is positioned.

  However, the cleaning unit UC does not have the intermediate transfer sheet feeding bobbin 19 and the intermediate transfer sheet take-up bobbin 20 unlike the second detachable unit U2, and includes a cleaning mechanism for cleaning the platen roller 37.

  FIG. 1 shows a schematic configuration of a cleaning mechanism built in the cleaning unit UC. The cleaning mechanism is cantilevered and has an arm 50 having substantially the same width as the platen roller 37, a cleaning pad 52 provided at the tip of the arm 50, an arm UP / DOWN lever 54, and an arm UP / DOWN lever. And a cam 56 whose end is in contact with the extension of the arm 50 and a torsion spring 58 that urges the arm 50 to return to the initial position. The arm 50 is biased to an initial position indicated by a broken line in the figure by a torsion spring 58. In the initial position, the arm 50 is positioned upward, so that the cleaning pad 52 is separated from the platen roller 37. When the arm UP / DOWN lever 54 is rotated in the direction of the arrow (counterclockwise) in the figure in this state, the cam 56 is rotated in conjunction with the rotation of the arm UP / DOWN lever 54 and the torsion spring 58 is attached. The arm 50 rotates around the support shaft against the force, and the cleaning pad 52 provided at the tip of the arm 50 contacts the platen roller 37. The platen roller 37 is cleaned by rotating the platen roller 37 while the cleaning pad 52 is in contact with the platen roller 37. After the cleaning is completed, the arm 50 is returned to the initial position by the urging force of the torsion spring 58 by rotating the arm UP / DOWN lever 54 clockwise. Instead of the torsion spring 58, a compression coil spring (not shown) may be set between the arm 50 and the base 90 of the cleaning unit UC.

  FIG. 2 shows a detailed configuration of the cleaning mechanism. The appearance of the cleaning unit UC is substantially the same shape and size as the second detachable unit U2 except that the intermediate transfer sheet delivery bobbin 19 and the intermediate transfer sheet take-up bobbin 20 are not present, and the front plate 17C and the rear plate 18C. And have. The front plate 17C has the same shape and the same size as the front plate 17, and similarly to the front plate 17, it has two upper and lower engagement fixing holes 26A and 26B on the left side and an engagement fixing hole 29 on the lower right side. Although not shown, the front plate 17C has two left and right engagement fixing holes in the middle step portion like the front plate 17, and the cleaning unit UC is connected to the main unit U5 by these engagement fixing holes. Position. For example, the upper and lower engagement fixing holes 26A and 26B are fitted to the upper and lower two engagement fixing bosses 28A and 28B provided on the front side plate 27 of the pinch roller unit U4.

  On the left side of the front plate 17C, an arm UP / DOWN lever 54 is rotatably provided. The arm UP / DOWN lever 54 is connected to a rotation shaft 64 extending in the front-rear direction of the cleaning unit UC, and the rotation shaft 64 rotates in conjunction with the rotation of the arm UP / DOWN lever 54. The rotary shaft 64 is provided with an extraction lock bar 60, a cam 56, and a lock mechanism pin 68 sequentially from the front to the rear. Also, a bent flat arm 50 having a cleaning pad 52 (which may be replaceable) at the tip is rotatably supported on the second rotating shaft 66 and wound around the rotating shaft 66. The torsion spring 58 abuts on the lower surface of the arm 50 and urges the arm 50 upward (clockwise around the rotation shaft 66 as viewed from the front). The arm 50 is located below the rotating shaft 64 and below the cam 56. A link mechanism 62 is provided at the rear end of the rotating shaft 64, and the link mechanism 62 controls the allowance and restriction of the rotation of the lock mechanism pin 68.

  In the initial position (UP position or first position), the arm UP / DOWN lever 54, the cam 56, the takeout lock bar 60 and the arm 50 are in the broken line positions, and the arm 50 is urged upward by the torsion spring 58, and the cleaning pad 52 does not contact the platen roller 37. When the arm UP / DOWN lever 54 is rotated counterclockwise from this initial position (DOWN position or second position), the rotating shaft 64 rotates, the cam 56 provided on the rotating shaft 64 rotates, and the cam 56 The tip of the arm contacts the upper surface of the arm 50 and pushes the arm 50 downward against the urging force of the torsion spring 58 (rotates counterclockwise when viewed from the front). By the rotation of the arm 50, the cleaning pad 52 at the tip comes into contact with the platen roller 37 and comes into close contact therewith. Further, the take-out lock bar 60 provided on the rotation shaft 64 rotates by the rotation of the rotation shaft 64. Then, as shown in the enlarged view of FIG. 3, the side surface (indicated by the oblique lines) of the takeout lock bar 60 enters the back side of the front side plate 27 of the pinch roller unit U4, and the extraction of the cleaning unit UC is restricted. Since the take-out lock bar 60 is rotated in conjunction with the rotation of the arm UP / DOWN lever 54, the cleaning unit UC is extracted in a state where the arm UP / DOWN lever 54 is rotated and set from the UP position to the DOWN position. Thus, the extraction of the cleaning pad 52 in contact with the platen roller 37 is prevented, and damage to the platen roller 37 is effectively prevented. Attachment and removal of the cleaning unit UC is allowed only when the arm UP / DOWN lever 54 is set to the UP position.

  Further, as described above, the lock mechanism pin 68 protrudes from the rotating shaft 64, and the lock mechanism pin 68 engages with the link mechanism 62. Specifically, as shown in the enlarged view of FIG. 4, the link mechanism 62 includes a link plate having an upright portion facing a rotary shaft (reel base) 31 </ b> A provided in a bowl shape on the front side of the support plate 2. And two claw portions 69 that are integrally formed with the link plate and project from left and right so as to sandwich the rotating shaft 64. The link plate having a pair of left and right claw portions 69 is bent so that its vertical cross-sectional shape is V-shaped or U-shaped, and its bottom is pivotally supported on the bottom surface of the cleaning unit UC. When the cleaning unit UC is not yet attached to the main body unit U5 and exists as a single unit, the link plate is inclined to the rear side as indicated by the broken line in the figure. Positioned to the left and right to sandwich, the rotation of the lock mechanism pin 68, that is, the rotation of the rotating shaft 64 is restricted. Therefore, when the cleaning unit UC exists as a single unit, the rotation of the arm UP / DOWN lever 54 is restricted by the claw portion 69, and prevents the unintentional rotation to the DOWN state when in the UP state. . When the cleaning unit UC is slid using the image processing means 4 as a guide and mounted on the main unit U5, the upright portion of the link plate that faces the rotation shaft (reel base) 31A contacts the rotation shaft (reel portion) 31A. The link plate swings around the axis, and the claw portion 69 moves to the solid line position in the figure. In this state, the claw portion 69 does not exist on the left and right sides of the lock mechanism pin 68, and therefore the rotation of the lock mechanism pin 68, that is, the rotation of the rotation shaft 64 is allowed. Therefore, when the cleaning unit UC is mounted on the main unit U5, the arm UP / DOWN lever 54 is allowed to rotate, and the platen roller 37 can be cleaned. When the cleaning unit UC is extracted from the main body unit U5, the claw portion 69 is positioned to the left and right so as to swing to the original position by the elastic force of the spring 70 and sandwich the lock mechanism pin 68. The rotation of the UP / DOWN lever 54 is restricted.

  As described above, in the present embodiment, the second detachable unit U2 having the same external shape and size as the second detachable unit U2 including the intermediate transfer sheet delivery bobbin 19 and the intermediate transfer sheet take-up bobbin 20 is used. The platen roller 37 can be cleaned by mounting the cleaning unit UC instead of U2. The arm 50 can be moved only when the cleaning unit UC is mounted by the action of the lock mechanism pin 68 and the link mechanism 62, and the removal of the cleaning unit UC is restricted during the cleaning by the action of the take-out lock bar 60. Therefore, damage to the platen roller 37 can be effectively prevented.

  As the cleaning procedure, the front door of the main unit U5 is opened, the second detachable unit U2 is replaced with the cleaning unit UC, the arm UP / DOWN lever 54 is rotated from the UP position to the DOWN position, The operation control unit provided in the unit U5 is set to the cleaning mode and is rotated by rotating the platen roller 37. The transition to the cleaning mode is performed when the cleaning unit UC is attached to the main unit U5. It is desirable to execute after confirming. For this reason, it is desirable to provide the cleaning unit UC with a mechanism for identifying the cleaning unit UC with the sensor on the main unit U5 side. For example, when a protrusion is provided at a predetermined position of the rear side plate 18 of the second detachable unit U2, and this is mounted, the unit detection switch of the main unit U5 is turned on by the protrusion to detect that the unit is mounted. In addition, in the case of a configuration provided with a photosensor that determines the type of the ink ribbon by detecting the color of the core flange of the ink ribbon with a photosensor, no protrusion is provided at a predetermined position of the rear side plate 18C of the cleaning unit UC. The configuration. As a result, the switch on the main unit U5 side is not turned ON even when the cleaning unit UC is attached, so that the second detachable unit U2 is not attached, and the white core (color of the cleaning unit UC is detected by the photo sensor). ) To detect that the cleaning unit UC is attached. Note that when no unit is mounted, the white core is not detected by the photosensor, so that it is not erroneously identified that the cleaning unit UC is mounted.

An example of the cleaning procedure in this embodiment is shown below.
(1) Set to the cleaning mode on the operation panel of the apparatus (2) Open the front door of the apparatus (3) Mount the cleaning unit UC (4) The arm UP / DOWN lever 54 is unlocked by mounting the cleaning unit UC (5 ) The arm UP / DOWN lever 54 is rotated from the UP position to the DOWN position to bring the cleaning pad 52 into contact with the platen roller 37. (6) The removal lock bar 60 locks out the cleaning unit UC. It is detected that the cleaning unit UC is mounted. (8) The platen roller 37 is rotated on the operation panel of the apparatus. (9) The rotation of the platen roller 37 is stopped after a predetermined time has elapsed. (10) The arm UP / DOWN lever 54 is moved to the DOWN position. To the UP position to clean the cleaning pad 52 Is separated from the platen roller 37 (11) withdrawn unlocked the cleaning unit UC by extraction lock bar 60 (12) withdrawal of the cleaning unit UC

  In addition to the takeout lock bar 60, the unit fixing means 33 shown in FIG. 8 may be rotated to prevent the cleaning unit UC from being taken out. Even if the operation of the unit fixing means 33 is forgotten, the removal lock bar 60 prevents the cleaning unit UC from being pulled out when the arm 50 is DOWN. It may be set so that the cleaning mode is activated by detecting the fixing by the unit fixing means 33.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various change is possible.

  For example, in this embodiment, the width of the arm 50 is the same as the width of the platen roller 37, but the width of the tip 50A of the arm 50 is made smaller than the width of the platen roller 37 as shown in FIG. The front end portion 50A may be provided slidably along the linear slide 74 in the direction of the arrow (front and rear) in the figure, and the platen roller 37 may be cleaned by sliding the front end portion 60A with the motor 72 and the belt 73. The control unit of the main unit U5 rotates the platen roller 37 and drives the motor 72 to slide the tip 60A in the width direction of the platen roller 37.

  Further, in this embodiment, UP / DOWN of the arm 50 is a manual operation by the arm UP / DOWN lever 54, but may be configured to be performed automatically. FIG. 6 shows a configuration example in this case. The front end portion of the rotating shaft 64 does not have the arm UP / DOWN lever 54, and has a connecting portion 80A connected to the drive shaft 31A and a connecting portion 80B connected to the drive shaft 31B at the rear end portion. The connecting portion 80A is formed in substantially the same shape as the intermediate transfer sheet delivery bobbin 19 so as to engage with the drive shaft 31A, and the connecting portion 80B is connected to the intermediate transfer sheet take-up bobbin so that the drive shaft 80B engages with the drive shaft 31B. 20 and substantially the same shape. A transmission mechanism 82 composed of a gear and a belt is connected to the connecting portions 80A and 80B. The transmission mechanism 82 transmits the driving force of the drive shaft 31A or the drive shaft 31B to the rotation shaft 64, thereby rotating the rotation shaft 64. When the drive shaft 31B is driven, the arm 50 is rotated from the UP position to the DOWN position by the rotation of the rotation shaft 64, and the cleaning pad 52 contacts the platen roller 37. Further, the takeout lock bar 60 is also rotated, and the removal of the cleaning unit UC in the state where the cleaning pad 52 is in contact with the platen roller 37 is prevented. On the other hand, when the drive shaft 31 </ b> A is driven, the rotation of the rotation shaft 64 causes the arm 50 to rotate from the DOWN position to the UP position, and the cleaning pad 52 is separated from the platen roller 37. At this time, the takeout lock bar 60 also rotates to release the removal prevention state of the cleaning unit UC.

It is a schematic block diagram of the cleaning mechanism in embodiment. It is a block diagram of the cleaning unit in embodiment. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. It is a block diagram of the cleaning unit in other embodiment. It is a block diagram of the cleaning unit in other embodiment. It is a block diagram of a conventional apparatus. It is a block diagram of a conventional apparatus.

Explanation of symbols

  UC cleaning unit, 50 arm, 52 cleaning pad, 54 arm UP / DOWN lever, 56 cam, 58 torsion spring, 60 takeout lock bar, 62 link mechanism, 64 rotary shaft, 66 second rotary shaft, 68 lock mechanism pin, 70 Spring.

Claims (4)

A body unit including a platen roller for transferring the print image to the sheet, and a transfer roller for bringing the sheet having the print image transferred thereon into close contact with the medium;
A detachable unit that is positioned and mounted to the main unit and supplies the sheet to the platen roller;
A cleaning unit for a printing apparatus having
The cleaning unit includes
The external shape is substantially the same as the detachable unit and can be positioned and mounted on the main unit instead of the detachable unit,
An arm which is arranged in the vicinity of the platen roller when mounted by positioning and is rotatable between a first position and a second position around a support shaft which is cantilevered;
A cleaning pad provided at the tip of the arm;
A cam provided on a rotating shaft, and abutting the arm by rotation around the rotating shaft to rotate the arm from the first position to the second position;
A spring that urges the arm to the first position to return the second position to the first position;
The cleaning pad is separated from the platen roller when the arm is in the first position by the cam, and the cleaning pad is moved when the arm is rotated to the second position by the cam. A cleaning unit for a printing apparatus, wherein the cleaning unit is in contact with a platen roller. The cleaning unit according to claim 1, wherein
An arm lever provided on the rotating shaft and capable of rotating;
A cleaning unit, wherein the cam lever rotates by rotating the arm lever to rotate the arm from the first position to the second position. The cleaning unit according to claim 2, wherein
A pin protruding from the rotating shaft;
The arm lever is provided so as to be movable along the rotation axis, and is positioned on both sides of the pin so as to sandwich the pin in a state where it is not attached to the main body unit, and the rotation of the arm lever is restricted and attached to the main body unit. A link mechanism that includes a pair of claw portions that move away from the pin and allow the arm lever to rotate by moving along the rotation axis by engagement with the main body unit in a state where
A cleaning unit comprising:   A printing apparatus comprising the cleaning unit according to claim 1.

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