JP4883079B2 - Printing device - Google Patents

Description

  The present invention relates to a printing apparatus that performs printing on a recording medium.

  In a recording apparatus such as an ink jet printer, when a recording medium is conveyed between a printing unit that ejects ink onto a recording medium such as paper and a conveyance unit that is opposed to the printing unit and conveys the recording medium. In some cases, a jam occurs in the recording medium.

  In Patent Document 1, when a jam occurs in a recording medium, after the ink discharge surface of the inkjet head is protected by a shutter, the front cover is unlocked so that the front cover for jam processing is opened. When the user removes the recording medium on which the ink has occurred, the ink jet head is prevented from being damaged.

JP 2005-96187 A

  By the way, the front cover is a cover for removing a recording medium in which a jam has occurred in the transport unit, but a cover for removing a recording medium in which a jam has occurred in a transfer unit located upstream or downstream of the transport unit is newly provided. It is possible. In such a case, when a jam occurs in the recording medium in the transfer unit, the user accidentally opens the front cover and approaches the transport unit, and as a result, the printing unit may be damaged.

  The objective of this invention is providing the printing apparatus which can suppress generation | occurrence | production of the damage in a printing part.

A printing apparatus according to the present invention is provided on a conveyance unit that conveys a recording medium, a printing unit that performs printing on the recording medium conveyed by the conveyance unit, and an upstream side and a downstream side of the conveyance unit, supplying Oite the recording medium to the conveying unit on the upstream side of the transport unit, a housing which incorporates a a transfer unit for discharging Oite the recording medium to the outside on the downstream side of the transport unit, the housing A first door that allows a user to approach the transfer unit when opened, a second door that is provided on the housing and allows the user to approach the transfer unit when opened, and A lock mechanism capable of prohibiting the opening of the first door; a first jam detecting means for detecting a jam of the recording medium in the transfer section; and the first jam detecting means for detecting a jam of the recording medium. When the first door is Have a, a lock control means for controlling the locking mechanism so that Ku's is prohibited, when the first jam detecting unit detects the jam of the recording medium, the opening of the second door are allowed state near the Ru.

  According to the above configuration, when the jam of the recording medium is detected in the transfer unit, the first door is prohibited from opening, and thus the user cannot open the first door. Thereby, since the approach to a conveyance part by a user is restrict | limited, generation | occurrence | production of the damage in a printing part can be suppressed.

  Further, in the printing apparatus of the present invention, the printing unit is an inkjet head having an ink ejection surface in which an ink ejection port for ejecting ink is formed, and a cap capable of covering the ink ejection surface; When the first jam detection unit detects a jam of the recording medium, the first jam detection unit may further include a cap execution unit that covers the ink ejection surface with the cap. According to the above configuration, when the jam of the recording medium is detected in the transfer unit, the ink discharge surface is covered with the cap, so that the ink discharge surface is clogged with ink or dust during the jam processing by the user. Can be prevented.

The printing apparatus of the present invention further includes a second jam detecting unit that detects a jam of the recording medium in the transport unit, and the lock control unit detects the jam of the recording medium in the transfer unit. When the first jam detecting means detects the jam of the recording medium in the transport unit and the second jam detecting means does not detect the jam, the first jam detecting means detects the jam of the recording medium in the transfer unit. When the second jam detecting means detects and detects the jam of the recording medium in the transport unit, the lock mechanism is controlled so that the first door is prohibited from opening, and the transfer unit The jam of the recording medium is detected by the first jam detecting means, and the jam of the recording medium in the transport unit is not detected by the second jam detecting means. And the second door when the first jam detecting unit detects a jam of the recording medium in the transfer unit and the second jam detecting unit detects a jam of the recording medium in the transport unit. May be permitted to be opened .

  According to the above configuration, when a jam of the recording medium is detected in the transport unit and a jam of the recording medium is detected in the transport unit, that is, in a state where the recording medium extends from the transport unit to the transport unit, When a jam occurs on each of the transfer unit side and the transfer unit side, the first door is prohibited from opening. As a result, the user cannot open the first door and the jam processing is performed from the second door, so that the approach to the transport unit by the user can be limited.

  In the printing apparatus according to the aspect of the invention, the lock control unit may always allow the first door to open when the jam of the recording medium in the transfer unit is not detected by the first jam detection unit. The locking mechanism may be controlled as described. According to the above configuration, when the jam of the recording medium is not detected in the transfer unit, the first door is always allowed to open, so power is used to prohibit the first door from opening. When necessary, this power can be reduced.

  In the printing apparatus according to the aspect of the invention, the lock control unit may not detect the jam of the recording medium in the transfer unit by the first jam detection unit and detect the jam of the recording medium in the transport unit as the second jam. The lock mechanism may be controlled so that the first door is allowed to open only when the detection means detects it. According to the above configuration, since the first door is allowed to open only when a jam of the recording medium is not detected in the transport unit and a jam of the recording medium is detected in the transport unit, the transport unit by the user The approach to can be sufficiently limited.

  According to the printing apparatus of the present invention, when the jam of the recording medium is detected in the transfer unit, the first door is prohibited from opening, and thus the user cannot open the first door. Thereby, since the approach to a conveyance part by a user is restrict | limited, generation | occurrence | production of the damage in a printing part can be suppressed.

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

[First Embodiment]
(Mechanical configuration of inkjet printer)
FIG. 1 is a perspective view showing an appearance of the ink jet printer according to the first embodiment of the present invention. FIG. 2 is a schematic side view showing the internal structure of the ink jet printer shown in FIG. FIG. 3 is a plan view of the four inkjet heads 2 shown in FIG. 2 and the vicinity thereof when viewed from above. FIG. 4 is a schematic side view showing the belt lifting mechanism. FIG. 5 is a perspective view showing the maintenance mechanism. FIG. 6 is a side view showing the capping operation. FIG. 7 is a partial side view showing the locking mechanism.

  As shown in FIG. 1, the ink jet printer (printing apparatus) 1 has a rectangular parallelepiped casing 1a, and two openings 3a and 3b are sequentially formed on the front surface (the front surface in FIG. 1) from the top. Is formed. The opening 3a is provided with a first door (first door) 4 that can be opened and closed with the horizontal axis at the lower end as a fulcrum. The opening 3a and the first door 4 are disposed to face the transport mechanism (transport section) 50 in the depth direction of the housing 1a (the direction perpendicular to the paper surface of FIG. 2 and the main scanning direction). In this configuration, when the paper (recording medium) P is jammed in the transport mechanism 50, the user can remove the jammed paper P by opening the first door 4 and approaching the transport mechanism 50. Yes.

  Further, as shown in FIG. 1, an opening 3c is formed on one side surface of the housing 1a (the front surface in FIG. 1). The opening 3c is provided with a third door (second door) 5 that can be opened and closed with the horizontal axis at the lower end as a fulcrum. As shown in FIG. 2, an outer conveyance surface 18 a constituting a conveyance guide (transfer section) 18 described later is formed inside the third door 5. The opening 3c and the third door 5 are disposed to face the inside of the conveyance guide 18 in the sub scanning direction. In this configuration, when the paper P is jammed in the conveyance guide 18, the user can remove the jammed paper P by opening the third door 5 and approaching the inside of the conveyance guide 18.

  In addition, an opening 3d (not shown) is formed on the other side surface of the housing 1a (the surface on the back side in FIG. 1). The opening 3d (not shown) is provided with a second door (second door) 6 that can be opened and closed with the horizontal axis at the lower end as a fulcrum. As shown in FIG. 2, an outer conveyance surface 17 a that constitutes a conveyance guide (transfer section) 17 described later is formed inside the second door 6. As shown in FIG. 2, the opening 3 d and the second door 6 are disposed to face the inside of the conveyance guide (transfer unit) 17 in the sub-scanning direction. In this configuration, when the paper P is jammed in the transport guide 17, the jammed paper P can be removed by the user opening the second door 6 and approaching the interior of the transport guide 17.

  As shown in FIG. 2, the ink jet printer 1 is a color ink jet printer having four ink jet heads (printing units) 2 that respectively eject magenta, cyan, yellow, and black inks. The ink jet printer 1 is provided with a paper feeding device 10 in the lower part in FIG. 2 and a paper discharge unit 15 in the upper part in FIG. 2, and transports the paper P along the transport direction A therebetween. A mechanism 50 is provided. Furthermore, the inkjet printer 1 includes a control unit 100 that controls these operations.

  The four inkjet heads 2 have a substantially rectangular parallelepiped shape elongated in the main scanning direction, and are fixed to a frame-like frame 7 in a state of being adjacent to each other along the sub-scanning direction. That is, the ink jet printer 1 is a line printer. In this embodiment, the sub-scanning direction is a direction parallel to the conveyance direction A of the paper P, and the main scanning direction is a direction orthogonal to the sub-scanning direction and along the horizontal plane (upper and lower in FIG. 3). Direction).

  The inkjet head 2 has a laminated body (both not shown) in which a flow path unit in which an ink flow path including a pressure chamber is formed and an actuator that applies pressure to ink in the pressure chamber are bonded together. Is an ink discharge surface 2a for discharging ink. As shown in FIG. 3, the ink discharge surface 2a has a plurality of ink discharge ports 2b for discharging ink, a discharge region 2c containing these ink discharge ports 2b, and a non-discharge region 2d surrounding the discharge region 2c. Is formed. The ejection region 2c is formed slightly longer than the paper P in the main scanning direction, and an image can be formed on the entire surface of the paper P transported by the transport mechanism 50 (marginless printing). . In FIG. 3, a maintenance mechanism 30 to be described later is not shown.

  As shown in FIG. 2, the sheet feeding device 10 includes a sheet feeding cassette 11 that can store a plurality of stacked sheets P, a sheet feeding roller 12 that feeds the sheet P from the sheet feeding cassette 11, and a sheet feeding roller 12. And a sheet feeding motor (not shown) that rotates. The paper feed cassette 11 is detachably arranged with respect to the direction perpendicular to the paper surface of FIG. 2, and is arranged at a position overlapping the transport mechanism 50 with respect to the vertical direction in FIG. 2 when mounted on the housing 1a. The paper feed roller 12 feeds the paper P from the paper feed cassette 11 by rotating and contacting the paper P positioned at the uppermost position. The paper feed motor that rotates the paper feed roller 12 is controlled by the control unit 100.

  On the left end side in FIG. 2, between the paper feed cassette 11 and the transport mechanism 50 along the transport path, the transport guide 17 that extends while curving from the paper feed cassette 11 toward the transport mechanism 50, and the transport guide Two feed rollers 23 a and 23 b provided on the downstream side of 17 are arranged. The conveyance guide 17 includes an outer conveyance surface 17a formed on the second door 6 and an inner conveyance surface 17b facing the outer conveyance surface 17a. The feed roller 23b is rotationally driven by a feed motor (not shown) controlled by the control unit 100. The feed roller 23a is a driven roller and rotates as the paper is conveyed.

  In this configuration, the paper feed roller 12 is rotated in the clockwise direction in FIG. 2 under the control of the control unit 100, so that the paper P in contact with the paper feed roller 12 passes through the conveyance guide 17 and moves upward in FIG. 2. Sent. Then, the paper P is supplied to the transport mechanism 50 while being held between the feed rollers 23a and 23b.

  Further, the detection surface is located in the conveyance guide 17 on the downstream side of the paper feed roller 12 and upstream of the conveyance guide 17 and on the downstream side of the conveyance guide 17 and upstream of the feed rollers 23a and 23b. Two sensors 73 and 74 are provided so as to face the passing paper P. These sensors 73 and 74 are reflection-type optical sensors that detect the paper P by reflecting light on the surface of the paper P, and are arranged at positions facing the inner center of the conveyance guide 17 in the main scanning direction. ing. These sensors 73 and 74 detect the front end of the paper P that has passed through the conveyance guide 17. The sensors 73 and 74 are not limited to reflective optical sensors, and may be transmissive optical sensors or the like.

  Here, if the sensor 74 does not detect the front end of the paper P even after a predetermined time has elapsed after the sensor 73 detects the front edge of the paper P, the control unit 100 sets the paper P in the transport guide 17. Determine that a jam has occurred. In this case, the control unit 100 stops the rotation of the paper feed roller 12 and the feed roller 23b.

  As shown in FIG. 2, the transport mechanism 50 includes two belt rollers 51, 52, an endless transport belt 53 wound around the belt rollers 51, 52, and tension on the transport belt 53. A tension roller 55 to which the belt roller 52 is added, a conveyance motor (not shown) that rotates the belt roller 52, and a suction device 60. The two belt rollers 51 and 52 are juxtaposed along the transport direction A. As shown in FIG. 3, the transport belt 53 has a transport surface (outer peripheral surface) 54 that supports the paper P.

  The belt roller 52 is a driving roller, and is rotated clockwise in FIG. 2 by a conveyance motor (not shown). The belt roller 51 is a driven roller, and rotates in the clockwise direction in FIG. 2 as the conveyor belt 53 travels as the belt roller 52 rotates. Further, as shown in FIG. 2, the tension roller 55 is rotatably supported by the housing 1a in a state where a tension is applied to the conveyor belt 53 while being in contact with the inner peripheral surface of the lower loop of the conveyor belt 53. As the conveyor belt 53 travels, it rotates in the clockwise direction in FIG.

  As shown in FIG. 2, the suction device 60 is disposed in a region surrounded by the conveyance belt 53, and includes a substantially rectangular parallelepiped platen 61 and a fan 62 disposed below the platen 61. Yes. A plurality of holes (not shown) penetrating in the thickness direction are formed on the upper surface of the platen 61. The plurality of holes are distributed throughout the region facing the conveyor belt 53. The platen 61 is formed slightly longer than the lengths of the paper P and the conveyor belt 53 in the main scanning direction.

  As shown in FIG. 2, the upper surface of the platen 61 is in contact with the inner peripheral surface of the upper loop of the conveyor belt 53, and supports this from the inner peripheral side of the conveyor belt 53. Thereby, the conveyance surface 54 of the upper loop of the conveyance belt 53 and the ejection surface 2a of the inkjet head 2 are parallel to each other, and a slight gap is formed between the ejection surface 2a and the conveyance surface 54 of the conveyance belt 53. Is formed. This gap constitutes a part of the paper transport path.

  As shown in FIG. 2, the fan 62 has a substantially rectangular parallelepiped shape, and sucks air from a suction port (not shown) formed on the upper surface when a rotating blade provided inside rotates. Device. The fan 62 is controlled by the control unit 100.

  A pressing roller 48 is disposed upstream of the inkjet head 2 disposed upstream in the transport direction A and at a position facing the belt roller 51. The pressing roller 48 is urged against the transport surface 54 by an elastic member (not shown) such as a spring, and presses the paper P sent out from the paper feeding device 10 against the transport surface 54. The pressing roller 48 is a driven roller, and rotates with the rotation of the conveyance belt 53.

  In this configuration, the conveyor belt 53 is rotated by rotating the belt roller 52 in the clockwise direction in FIG. 2 under the control of the control unit 100. At this time, the belt roller 51, the tension roller 55, and the pressing roller 48 also rotate with the rotation of the conveyance belt 53. At this time, the fan 62 is driven by the control of the control unit 100, and the air sucked from all the holes provided in the platen 61 is sucked into the suction port provided in the fan 62. As a result, the paper P delivered from the paper feeder 10 is conveyed in the conveyance direction A while being attracted to the conveyance surface 54. Further, at this time, when the paper P that is conveyed while being held on the conveyance surface 54 of the conveyance belt 53 sequentially passes immediately below the four inkjet heads 2, the control unit 100 controls each inkjet head 2. Ink of each color is ejected toward the paper P. Thus, a desired color image is formed on the paper P.

  Further, the two sensors 71 and 72 are disposed between the pressing roller 48 and the inkjet head 2 and downstream of the inkjet head 2 that is most downstream in the conveyance direction A so that the detection surface faces the conveyance surface 54. Is provided. These sensors 71 and 72 are reflection-type optical sensors that detect the paper P by reflecting light on the surface of the paper P, and are arranged at positions facing the center of the transport surface 54 in the main scanning direction. Yes. These sensors 71 and 72 detect the front end of the paper P that has been transported by the transport belt 53. The sensors 71 and 72 are not limited to reflective optical sensors, and may be transmissive optical sensors or the like.

  If the sensor 72 does not detect the front end of the paper P even after a predetermined time has elapsed after the sensor 71 detects the front edge of the paper P, the control unit 100 controls the paper P on the transport mechanism 50. Determine that a jam has occurred. In this case, the control unit 100 stops the rotation of the conveyance belt 53 and stops the ink ejection by each inkjet head 2.

  As shown in FIG. 4, the transport mechanism 50 includes a belt lift mechanism 80, a print position taken when an image is printed on the paper P by the ink ejected from the inkjet head 2, the ink ejection surface 2 a, and the transport. The separation distance from the mechanism 50 is larger than that at the printing position, and the inkjet head 2 is placed between the removal position taken when the user removes the jammed paper P between the ink ejection surface 2a and the conveyance mechanism 50. On the other hand, it is moved up and down. That is, the transport mechanism 50 is moved up and down between a printing position close to the inkjet head 2 and a removal position moved below the printing position, as shown in FIG.

  As shown in FIG. 4, the belt elevating mechanism 80 includes an elevating unit 81 that elevates and lowers the belt roller 51 and an elevating unit 85 that elevates and lowers the belt roller 52. The raising / lowering part 81 has the raising / lowering motor 82, the two rings 83, and the wire 84 which is a connection member. The ring 83 is provided in the vicinity of both ends of the shaft 51a of the belt roller 51, and rotatably supports the shaft 51a. One end of the wire 84 is fixed to the upper end of the ring 83. The other end of the wire 84 is wound while being fixed to the shaft 82 a of the lifting motor 82. A guide 91 is provided in the housing 1a to guide the movement of both ends of the shaft 51a of the belt roller 51 up and down at positions facing both ends of the shaft 51a of the belt roller 51. The guide 91 has an upper end at the position of the shaft 51a when the transport mechanism 50 is disposed at the printing position, and extends downward therefrom.

  The lifting / lowering unit 85 also includes a lifting / lowering motor 86, two rings 87, and a wire 88 that is a connecting member. The ring 87 is provided in the vicinity of both ends of the shaft 52a, and supports the shaft 52a in a rotatable manner. The wire 88 is also wound around the shaft 86 a while one end is fixed to the upper end of the ring 87 and the other end is fixed to the shaft 86 a of the lifting motor 86. Further, a guide 92 is provided in the housing 1a to guide the movement of both ends of the shaft 52a of the belt roller 52 up and down at positions facing both ends of the shaft 52a of the belt roller 52. The guide 92 has an upper end at the position of the shaft 52a when the transport mechanism 50 is disposed at the printing position, and extends downward therefrom.

  In this configuration, when the two elevating motors 82 and 86 are simultaneously driven by the control of the control unit 100 and the shafts 82a and 86a rotate counterclockwise in FIG. 4, the connecting members 84 and 88 are removed from the shafts 82a and 86a. Unrolled. As a result, the transport mechanism 50 moves downward along the guides 91 and 92. That is, the transport mechanism 50 moves from the printing position to the removal position. On the other hand, when the shafts 82a and 86a rotate in the clockwise direction in FIG. 4 under the control of the control unit 100, the connecting members 84 and 88 are wound around the shafts 82a and 86a. As a result, the transport mechanism 50 moves upward along the guides 91 and 92. That is, the transport mechanism 50 moves from the removal position to the printing position.

  The transport mechanism 50 is moved from the printing position to the removal position when a jam occurs on the paper P in the transport mechanism 50 when the transport mechanism 50 is positioned at the printing position and an image is printed on the paper P. Is called. As a result, the separation distance between the ink ejection surface 2a and the transport mechanism 50 is increased, and the user can easily remove the jammed paper P by opening the first door 4 and approaching the transport mechanism 50. .

  In the present embodiment, the transport mechanism 50 is moved up and down with respect to the inkjet head 2 by the belt lifting mechanism 80, but the present invention is not limited to this, and the inkjet head 2 is moved by the belt lifting mechanism 80. May be configured to be moved up and down with respect to the transport mechanism 50.

  As shown in FIG. 2, a peeling plate 9 is provided immediately downstream in the transport direction A of the transport mechanism 50. The peeling plate 9 peels the paper P from the transport surface 54 by the leading end of the peeling plate 9 entering between the paper P and the transport belt 53.

  Between the transport mechanism 50 and the paper discharge unit 15, the transport disposed between the four feed rollers 21 a, 21 b, 22 a, 22 b and the feed rollers 21 a, 21 b and the feed rollers 22 a, 22 b. A guide 18 is arranged. The feed rollers 21b and 22b are rotationally driven by a feed motor (not shown) controlled by the control unit 100. The feed rollers 21a and 22a are driven rollers and rotate as the paper is conveyed. The conveyance guide 18 includes an outer conveyance surface 18a formed on the third door 5 and an inner conveyance surface 18b facing the outer conveyance surface 18a.

  In this configuration, under the control of the control unit 100, the feed motor is driven so that the feed rollers 21b and 22b rotate, and the sheet P discharged from the transport mechanism 50 is held by the feed rollers 21a and 21b, and the inside of the transport guide 18 is reached. And sent upward in FIG. Then, the paper P is discharged to the paper discharge unit 15 while being held between the feed rollers 22a and 22b.

  Further, the detection surface is located in the conveyance guide 18 on the downstream side of the peeling plate 9 and upstream of the feed rollers 21a and 21b and on the downstream side of the conveyance guide 18 and upstream of the conveyance rollers 22a and 22b. Two sensors 75 and 76 are provided so as to face the sheet P passing through the sheet. These sensors 75 and 76 are reflection-type optical sensors that detect the paper P when light is reflected by the surface of the paper P, and are arranged at positions facing the inner center of the conveyance guide 18 in the main scanning direction. ing. These sensors 75 and 76 detect the front end of the paper P that has passed through the conveyance guide 18. The sensors 75 and 76 are not limited to reflective optical sensors, and may be transmissive optical sensors or the like.

  Here, if the sensor 76 does not detect the front end of the paper P even after a predetermined time has elapsed after the sensor 75 detects the front edge of the paper P, the control unit 100 causes the paper P in the transport guide 18 to be detected. It is determined that a jam has occurred. In this case, the control unit 100 stops the rotation of the feed roller 21b and the feed roller 22b.

  As shown in FIG. 2, a maintenance mechanism 30 is provided between the four inkjet heads 2 and the transport mechanism 50. The maintenance mechanism 30 has four caps 31 that can cover the ink ejection surface 2 a of each inkjet head 2. The cap 31 is made of an elastic material such as rubber having a rectangular planar shape, and its longitudinal direction is parallel to the longitudinal direction of the inkjet head 2. In the initial state, the cap 31 is positioned on the side of the upstream side of the corresponding inkjet head 2, and in the up, down, left, and right directions in FIG. 2 with respect to the corresponding inkjet head 2 as the maintenance mechanism 30 moves. Moved.

  As shown in FIG. 5A, the maintenance mechanism 30 is arranged at equal intervals along the sub-scanning direction, and has four plate bodies 32 each provided with a cap 31 on each upper surface, and each plate body 32 is narrowed. And a pair of inner frames 33 having corners 33a protruding upward at both ends. A pinion gear 34 fixed to a shaft of a drive motor (not shown) is provided at one corner 33a of each inner frame 33 so as to mesh with a rack gear 35 provided in the horizontal direction. In FIG. 5A, the pinion gear 34 is shown only in the inner frame 33 on the front side.

  In addition, the maintenance mechanism 30 has an outer frame 36 provided on the outer periphery of the pair of inner frames 33 as shown in FIG. A rack gear 35 shown in FIG. 5A is fixed inside the outer frame 36. The outer frame 36 is provided with a pinion gear 37 fixed to a shaft of a drive motor (not shown) so as to mesh with a rack gear 38 provided in the vertical direction. The rack gear 38 is erected inside the housing 1a.

  In this configuration, by rotating the two pinion gears 34 in synchronization, the pair of inner frames 33 are moved along the sub-scanning direction. Further, by rotating the pinion gear 37, the outer frame 36 is moved along the vertical direction.

  Specifically, in the initial position shown in FIG. 2, each plate 32 is positioned on the upstream side of each inkjet head 2, and in FIG. 5A, 3 between the plates 32. One opening 39a and the opening 39b between the plate body 32 on the most downstream side and the corner portion 33a of the inner frame 33 are respectively opposed to the ink ejection surface 2a. From this initial state, when a capping operation is performed in which each cap 31 covers the corresponding ink ejection surface 2a, the outer frame 36 is first lowered in the vertical direction as shown in FIG. The mechanism 30 is located at an intervening position located between the inkjet head 2 and the transport mechanism 50. At this time, the cap 31 is positioned at a retracted position that does not face the ink ejection surface 2a.

  Next, as shown in FIG. 6B, the pair of inner frames 33 are moved downstream in the sub-scanning direction. At this time, the cap 31 is positioned at a facing position facing the ink ejection surface 2a. Next, as shown in FIG. 6C, the outer frame 36 is raised in the vertical direction so that the cap 31 comes into contact with the ink discharge surface 2a and is positioned at a cap position that covers the ink discharge surface 2a. According to the above procedure, each cap 31 covers the corresponding ink ejection surface 2a. The cap 31 is returned to the initial position by the reverse procedure.

  The capping operation described above is performed in a state where the transport mechanism 50 is lowered from the printing position to the removal position by the belt lifting mechanism 80 or in a state where the transport mechanism 50 is positioned at the printing position. The capping operation is performed when a jam occurs on the paper P in any of the transport guide 17, the transport guide 18, and the transport mechanism 50.

  As described above, when the paper P is jammed in any one of the transport guide 17, the transport guide 18, and the transport mechanism 50, the ink ejection surface 2 a is covered with the cap 31, and thus the ink ejection surface during the jam processing by the user. 2a can be prevented from being clogged with ink or dust.

  Returning to FIG. 1, opening of the first door 4 that allows the user to approach the transport mechanism 50 when opened is prohibited by the lock mechanism 40. As shown in FIG. 7, the lock mechanism 40 is provided on the inner side of the housing 1 a, a solenoid 41 that linearly moves the movable iron core 41 a back and forth, and a movable iron core that is provided inside the first door 4 and advanced. It has the protrusion part 42 which has the hole 42a which 41a can penetrate.

  The lock mechanism 40 does not allow the movable iron core 41a of the solenoid 41 to advance as shown in FIG. 7A when the paper P is not jammed in the transport guide 17 or the transport guide 18. Thereby, in the conveyance guide 17 or the conveyance guide 18, when the paper P is not jammed, the first door 4 is always allowed to open. On the other hand, when the jam occurs in the paper P in the transport guide 17 or the transport guide 18, the lock mechanism 40 advances the movable iron core 41a of the solenoid 41 as shown in FIG. Thereby, it is prohibited that the movable iron core 41a penetrates the hole 42a of the protrusion 42 and the first door 4 is opened. That is, the user is prohibited from approaching the transport mechanism 50.

  As described above, in the conveyance guide 17 or the conveyance guide 18, when the paper P is jammed, the first door 4 is prohibited from being opened, and thus the user cannot open the first door 4. Thereby, since the approach to the conveyance mechanism 50 by the user is limited, the occurrence of damage in the inkjet head 2 can be suppressed.

  Further, the lock mechanism 40 is configured such that when the paper P is jammed in the transport guide 17 or the transport guide 18 and the paper P is jammed in the transport mechanism 50, that is, the paper P is transported from the transport guide 17 to the transport mechanism 50. When a jam occurs on the conveyance guide 17 side and the conveyance mechanism 50 side of the sheet P in a state where the sheet P is straddled, or when the sheet P straddles the conveyance guide 18 from the conveyance mechanism 50, When a jam occurs on each of the side and the conveyance guide 18 side, the movable iron core 41a of the solenoid 41 is advanced as shown in FIG. As a result, the opening of the first door 4 is prohibited. That is, the user is prohibited from approaching the transport mechanism 50.

  As described above, when the paper P straddles the transport mechanism 50 from the transport guide 17, a jam occurs on the transport guide 17 side and the transport mechanism 50 side of the paper P, or the paper P is transported from the transport mechanism 50. When a jam occurs on the transport mechanism 50 side and the transport guide 18 side of the paper P while straddling the guide 18, the opening of the first door 4 is prohibited. As a result, the user cannot open the first door 4, and the jam processing is performed from the third door 5 or the second door 6, so that the approach to the transport mechanism 50 by the user can be limited. The occurrence of damage in the inkjet head 2 can be suppressed.

  In addition, when the paper P is not jammed in the transport guide 17 or the transport guide 18, the first door 4 is always allowed to open. Therefore, a solenoid is used to prohibit the first door 4 from opening. The power consumed by 41 can be reduced.

(Electrical configuration of inkjet printer)
The operation of the inkjet printer 1 is controlled by the control unit 100 as shown in FIG. The control unit 100 includes a microcomputer 101 disposed on a circuit board as a main component, and is configured by adding various circuits thereto. The microcomputer 101 includes a CPU 102 that performs a control operation according to a preset program, a ROM 103 that stores various programs, and a RAM 104 that serves as a temporary storage unit.

  The CPU 102 includes a head control circuit 106 that controls the inkjet head 2, a transport mechanism 50, feed rollers 21 b, 22 b, and 23 b, a transport mechanism control circuit 107 that controls the paper feed roller 12, and a belt lift mechanism that controls the belt lift mechanism 80. The control circuit 108, the maintenance mechanism control circuit 109 that controls the maintenance mechanism 30, the lock mechanism control circuit 110 that controls the lock mechanism 40, the interface circuit 111 that receives the paper detection signals from the sensors 71 to 76, and the communication unit 20. A communication circuit 112 that communicates with a general-purpose personal computer (not shown) or the like is connected via the computer.

  The head control circuit 106 controls each inkjet head 2 so as to eject ink onto the paper P based on print data transferred via a communication unit 20 from a general-purpose personal computer or the like (not shown). At this time, the head control circuit 106 sets each inkjet head so that ink discharge to the paper P is started after a predetermined time has elapsed since the sensor 71 detects the front end of the paper P conveyed by the conveyance mechanism 50. 2 is controlled. The predetermined time here refers to a distance along the transport path from the front end of the paper P to the ink discharge port 2b located upstream of the upstream ink jet head 2 when the sensor 71 detects the front edge of the paper P. The time divided by the conveyance speed of the paper P.

  Further, the transport mechanism control circuit 107 controls the transport mechanism 50, the feed rollers 21b, 22b, and 23b, and the paper feed roller 12 so as to transport the paper P from the paper feeder 10 to the paper discharge unit 15.

  The belt lifting mechanism control circuit 108 controls the belt lifting mechanism 80 so that the transport mechanism 50 is separated from the inkjet head 2 when a jam occurs in the paper P being transported.

  The maintenance mechanism control circuit 109 serving as a cap execution unit controls the maintenance mechanism 30 so as to perform a capping operation when a jam occurs in the paper P being conveyed.

  In addition, the CPU 102 determines that a jam has occurred in the paper P only when the detection interval of the paper P by the three sets of sensors 71 to 76 exceeds a predetermined time. In other words, among a pair of sensors adjacent along the transport direction A, a predetermined time that is a scheduled time at which the downstream sensor detects the front edge of the paper P from the time when the upstream sensor detects the front edge of the paper P. If the downstream sensor does not detect the front edge of the paper P before the time elapses, it is determined that a jam has occurred in the paper P. The predetermined time here is a time obtained by dividing the separation distance along the conveyance path between a pair of sensors by the conveyance speed of the paper P.

  Specifically, the CPU 102 first determines a predetermined time after the predetermined time has elapsed from the time when the sensor 73 detects the front edge of the paper P, that is, the predetermined time after the sensor 73 detects the front edge of the paper P (sensor 73). When the sensor 74 does not detect the front edge of the paper P until the time (distance obtained by dividing the distance between the sensor 74 and the sensor 74) elapses, it is determined that a jam has occurred in the paper P in the transport guide 17. To do. That is, the CPU 102 as the first jam detection unit detects a jam of the paper P in the transport guide 17. Next, after the sensor 71 detects the front edge of the paper P, the CPU 102 detects that the sensor 72 is on the paper until a predetermined time (a time obtained by dividing the separation distance between the sensor 71 and the sensor 72 by the transport speed) elapses. When the front end of P is not detected, the transport mechanism 50 determines that a jam has occurred in the paper P. That is, the CPU 102 as the second jam detection unit detects a jam of the paper P in the transport mechanism 50. Next, after the sensor 75 detects the front edge of the paper P, the CPU 102 detects that the sensor 76 has not yet passed the predetermined time (the time obtained by dividing the separation distance between the sensor 75 and the sensor 76 by the transport speed). When the front end of P is not detected, the conveyance guide 18 determines that a jam has occurred on the paper P. That is, the CPU 102 as the first jam detection unit detects a jam of the paper P in the transport guide 18.

  When the CPU 102 determines that a jam has occurred as described above, the head control circuit 106 and the transport mechanism control circuit 107 stop the ink ejection from each inkjet head 2, and the paper P is transported by the transport mechanism 50. Stop conveyance. Note that when the detection interval from the three sets of sensors 71 to 76 is within a predetermined time and the CPU 102 does not determine that a jam has occurred, the ink is applied to the paper P when the paper P faces the inkjet head 2. Is ejected to form an image, which is discharged to the paper discharge unit 15.

  Further, the lock mechanism control circuit 110 as the lock control means controls the lock mechanism 40 so that the first door 4 is prohibited from opening when it is determined that a jam has occurred in the transport guide 17 or the transport guide 18. Control. Further, the lock mechanism control circuit 110 serving as the lock control means determines that a jam has occurred in the transport guide 17 or the transport guide 18 and if it is not determined that a jam has occurred in the transport mechanism 50, and When it is determined that a jam has occurred in the guide 17 or the transport guide 18 and it is determined that a jam has occurred in the transport mechanism 50, the lock mechanism 40 is controlled so that the opening of the first door 4 is prohibited. To do. Further, the lock mechanism control circuit 110 as the lock control means locks the first door 4 to be always allowed to open when it is not determined that a jam has occurred in the transport guide 17 or the transport guide 18. The mechanism 40 is controlled.

(Inkjet printer operation)
With the above configuration, the operation of the inkjet printer 1 will be described with reference to the jam handling routine shown in FIG.

(Jam handling routine)
When the jam processing routine is executed, a paper feed path jam detection process is performed as shown in FIG. 9 (S1). The paper feed path jam detection process will be described later. Thereafter, a conveyance unit jam detection process is performed (S2). Since the conveyance section jam detection process is the same as the paper feed path jam detection process, the description thereof is omitted. Subsequently, a paper discharge path jam detection process is performed (S3). Since the paper discharge path jam detection process is the same as the paper path jam detection process, the description thereof is omitted.

  Next, it is determined whether or not a jam has occurred in any of the transport guide 17, the transport guide 18, and the transport mechanism 50 (S4). If it is determined that a jam has not occurred, the process returns to step S1. On the other hand, if it is determined that a jam has occurred, printing is stopped by controlling the inkjet head 2 by the head control circuit 106 (S5), and the transport mechanism 50 is fed by the transport mechanism control circuit 107. By controlling the rollers 21b, 22b, 23b and the paper feed roller 12, the conveyance of the paper P is stopped (S6). Then, an error signal is transmitted from the communication circuit 112 to the outside via the communication unit 20 (S7).

  Thereafter, it is determined whether or not a jam has occurred only in the transport mechanism 50 (S8). When it is determined that a jam has occurred only in the transport mechanism 50, the belt lift mechanism 80 is controlled by the belt lift mechanism control circuit 108, whereby the transport mechanism 50 is lowered and removed away from the inkjet head 2. The transport mechanism 50 is positioned at the position (S9). Then, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby a capping operation is performed (S10). As a result, the ink ejection surface 2 a is covered with the cap 31. The user opens the first door 4 and performs jam processing.

  Here, when the paper P is not jammed in the transport guide 17 or the transport guide 18, the first door 4 is always allowed to open, so that the first door 4 cannot be opened. The power consumed by the solenoid 41 can be reduced.

  Further, when the paper P is jammed in the transport mechanism 50, the ink ejection surface 2a is covered with the cap 31, so that the ink ejection surface 2a is prevented from being clogged with ink or dust during the jam processing by the user. be able to.

  Thereafter, it is determined whether or not a return signal indicating that the jam processing by the user has been received is received (S11). If it is determined that the return signal has not been received, step S11 is repeated to wait for reception of the return signal. On the other hand, when it is determined that the return signal has been received, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby the maintenance mechanism 30 is returned to the initial position (S12). Then, the belt elevating mechanism 80 is controlled by the belt elevating mechanism control circuit 108, whereby the conveying mechanism 50 is raised, and the conveying mechanism 50 is positioned at a printing position close to the inkjet head 2 (S13). Then, the process returns to step S1.

  If it is determined in step S8 that a jam has not occurred only in the transport mechanism 50, a jam has occurred only in the transport guide 17, or a jam has occurred only in the transport guide 18, or the transport guide. The lock mechanism 40 is controlled by the lock mechanism control circuit 110 because either a jam occurs simultaneously between the transfer mechanism 17 and the transfer mechanism 50 or a jam occurs simultaneously between the transfer guide 18 and the transfer mechanism 50. As a result, the first door 4 is prevented from opening (S14). Then, the maintenance mechanism control circuit 109 controls the maintenance mechanism 30 to perform a capping operation (S15). As a result, the ink ejection surface 2 a is covered with the cap 31. The user opens the second door 6 or the third door 5 to perform jam processing.

  As described above, in the conveyance guide 17 or the conveyance guide 18, when the paper P is jammed, the first door 4 is prohibited from being opened, and thus the user cannot open the first door 4. Thereby, since the approach to the conveyance mechanism 50 by the user is limited, the occurrence of damage in the inkjet head 2 can be suppressed.

  Further, when a jam occurs on the conveyance guide 17 side and the conveyance mechanism 50 side of the paper P in a state where the paper P straddles the conveyance mechanism 17 from the conveyance guide 17, or the paper P is conveyed from the conveyance mechanism 50 to the conveyance guide 18. When the jam occurs on the transport mechanism 50 side and the transport guide 18 side of the paper P in a state where the paper P is straddled, the opening of the first door 4 is prohibited. As a result, the user cannot open the first door 4, and the jam processing is performed from the third door 5 or the second door 6, so that the approach to the transport mechanism 50 by the user can be limited. The occurrence of damage in the inkjet head 2 can be suppressed.

  Further, when the paper P is jammed in the transport guide 17 or the transport guide 18, the ink discharge surface 2 a is covered with the cap 31, so that the ink discharge surface 2 a is clogged with ink or dust during the jam processing by the user. Can be prevented.

  Thereafter, it is determined whether or not a return signal indicating that the jam processing by the user has been received is received (S16). If it is determined that the return signal has not been received, step S16 is repeated to wait for reception of the return signal. On the other hand, when it is determined that the return signal has been received, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby the maintenance mechanism 30 is returned to the initial position (S17). Then, the lock mechanism control circuit 110 controls the lock mechanism 40 to open the first door 4 (S18). Then, it returns to step S1.

(Paper path jam detection processing routine)
Next, the paper feed path jam detection processing routine which is step S1 in FIG. 9 will be described with reference to FIG. As shown in FIG. 10, the first flag is set to “0” (S101). Here, the first flag is used together with the second flag in the transport section jam detection processing routine and the third flag in the paper discharge path jam detection processing routine to determine whether or not a jam has occurred in step S4 of FIG. At the same time, it is used to determine where a jam has occurred in step S8 of FIG. 9, and is updated to “1” when a jam has occurred. For example, if the first flag is “1”, the second flag is “0”, and the third flag is “0”, it is determined that a jam has occurred in the transport guide 17.

  Then, it is determined whether or not the upstream sensor 73 has detected the front edge of the paper P (S102). If it is determined that the upstream sensor 73 has not detected the front edge of the paper P, this subroutine is terminated and the process returns to the jam processing routine of FIG.

  On the other hand, when it is determined that the upstream sensor 73 has detected the front edge of the paper P, it is determined whether the downstream sensor 74 has detected the front edge of the paper P (S103). If it is determined that the downstream sensor 74 has detected the front edge of the paper P, this subroutine is terminated, and the process returns to the jam processing routine of FIG.

  On the other hand, if it is determined that the downstream sensor 74 has not detected the front edge of the paper P, it is determined whether or not a predetermined time has elapsed (S104). If it is determined that the predetermined time has not elapsed, the process returns to step S103. On the other hand, if it is determined that the predetermined time has elapsed, it is determined that a jam has occurred, the first flag is updated from “0” to “1” (S105), this subroutine is terminated, and FIG. Return to the jam handling routine of No. 9.

[Second Embodiment]
(Mechanical configuration of inkjet printer)
Next, a second embodiment will be described. The second embodiment is different from the first embodiment in that the first door 4 is not always opened except when a jam occurs only in the transport mechanism 50. That is, the first door 4 is allowed to open only when a jam of the paper P is not detected in the transport guide 17 or the transport guide 18 and a jam of the paper P is detected in the transport mechanism 50. Thereby, the approach to the conveyance mechanism 50 by the user can be sufficiently limited. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

(Inkjet printer operation)
The operation of the inkjet printer 1 of the present embodiment will be described with reference to the jam processing routine shown in FIG.

(Jam handling routine)
When the jam processing routine is executed, a paper feed path jam detection process is performed as shown in FIG. 11 (S201). The paper feed path jam detection process has been described with reference to FIG. Thereafter, a conveyance unit jam detection process is performed (S202). Subsequently, a paper discharge path jam detection process is performed (S203).

  Next, it is determined whether or not a jam has occurred in any of the transport guide 17, the transport guide 18, and the transport mechanism 50 (S204). If it is determined that a jam has not occurred, the process returns to step S201. On the other hand, if it is determined that a jam has occurred, printing is stopped by controlling the inkjet head 2 by the head control circuit 106 (S205), and the transport mechanism 50 is fed by the transport mechanism control circuit 107. The conveyance of the paper P is stopped by controlling the rollers 21b, 22b, 23b and the paper feed roller 12 (S206). Then, an error signal is transmitted from the communication circuit 112 to the outside via the communication unit 20 (S207).

  Thereafter, it is determined whether or not a jam has occurred only in the transport mechanism 50 (S208). When it is determined that a jam has occurred only in the transport mechanism 50, the belt lift mechanism 80 is controlled by the belt lift mechanism control circuit 108, whereby the transport mechanism 50 is lowered and removed away from the inkjet head 2. The transport mechanism 50 is positioned at the position (S209). Then, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby a capping operation is performed (S210). As a result, the ink ejection surface 2 a is covered with the cap 31.

  Next, the lock mechanism 40 is controlled by the lock mechanism control circuit 110, whereby the first door 4 is opened (S211). The user opens the first door 4 and performs jam processing.

  Thereafter, it is determined whether or not a return signal indicating that the jam processing by the user has been received is received (S212). If it is determined that the return signal has not been received, step S212 is repeated to wait for reception of the return signal. On the other hand, if it is determined that the return signal has been received, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby the maintenance mechanism 30 is returned to the initial position (S213). Then, the belt elevating mechanism 80 is controlled by the belt elevating mechanism control circuit 108, whereby the conveying mechanism 50 is raised, and the conveying mechanism 50 is positioned at a printing position close to the inkjet head 2 (S214). Then, the lock mechanism 40 is controlled by the lock mechanism control circuit 110 so that the first door 4 is not opened (S215). Thereafter, the process returns to step S201.

  If it is determined in step S208 that a jam has not occurred in the transport mechanism 50 alone, a jam has occurred in the transport guide 17 alone, a jam has occurred in the transport guide 18 only, or a transport guide. The maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109 because a jam occurs simultaneously between the transport mechanism 17 and the transport mechanism 50 or a jam occurs simultaneously between the transport guide 18 and the transport mechanism 50. Thus, a capping operation is performed (S216). As a result, the ink ejection surface 2 a is covered with the cap 31. Since the user cannot open the first door 4, the user opens the second door 6 or the third door 5 that can be opened and closed to perform jam processing.

  As described above, the first door 4 is allowed to open only when the paper P is not jammed in the transport guide 17 or the transport guide 18 and the paper P is jammed in the transport mechanism 50. The approach to the transport mechanism 50 by the user can be sufficiently limited.

  Thereafter, it is determined whether or not a return signal indicating that the jam processing by the user has been received is received (S217). If it is determined that the return signal has not been received, step S217 is repeated to wait for reception of the return signal. On the other hand, when it is determined that the return signal has been received, the maintenance mechanism 30 is controlled by the maintenance mechanism control circuit 109, whereby the maintenance mechanism 30 is returned to the initial position (S218). Thereafter, the process returns to step S201.

(Modification of each embodiment)
The embodiments of the present invention have been described above, but only specific examples have been illustrated, and the present invention is not particularly limited. Specific configurations and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

  For example, in the above-described embodiment, the second door 6 and the third door 5 are configured to be always allowed to be opened, but the second door 6 is opened only when a jam occurs in the conveyance guide 17. It may be configured to allow this. Similarly, the third door 5 may be allowed to be opened only when a jam occurs in the transport guide 18. That is, the second door 6 and the third door 5 may be configured to be opened and closed by a mechanism similar to the lock mechanism 40 described above.

  Further, in the above-described embodiment, when the jam occurs only in the transport mechanism 50, the transport mechanism 50 is lowered from the printing position to the removal position, but the transport mechanism 50 and the transport guide 17 simultaneously. Even when a jam occurs or when a jam occurs simultaneously in the transport mechanism 50 and the transport guide 18, the transport mechanism 50 may be lowered from the printing position to the removal position.

  In addition, when a jam occurs, the capping operation may not be performed.

  Further, when the paper P straddles the transport mechanism 50 from the transport guide 17 and the jam occurs on the transport guide 17 side and the transport mechanism 50 side of the paper P, the first door 4 is allowed to open. It may be configured. Similarly, the first door 4 is allowed to open when a jam occurs on the transport guide 18 side and the transport mechanism 50 side of the paper P with the paper P straddling the transport mechanism 50 from the transport guide 18. It may be configured as follows.

  The printing apparatus according to the present invention is not limited to the ink jet type, but can be applied to a thermal type, and is not limited to a line type, and can also be applied to a serial type in which a head reciprocates. Further, the present invention is not limited to a printer, and can be applied to a facsimile, a copier, and the like. Further, the transport mechanism 50 in the present embodiment transports the paper P in the horizontal direction, but the paper P can be transported in a direction other than the horizontal direction (for example, an oblique direction and a vertical direction). The conveyance surface 54 parallel to the ink ejection surface 2a may be disposed inclined with respect to the horizontal direction.

It is a perspective view which shows the external appearance of an inkjet printer. It is a schematic side view which shows the internal structure of the inkjet printer shown in FIG. FIG. 3 is a plan view of the four inkjet heads shown in FIG. 2 and the vicinity thereof when viewed from above. It is a schematic side view which shows a belt raising / lowering mechanism. It is a perspective view which shows a maintenance mechanism. It is a side view which shows a capping operation | movement. It is a partial side view which shows a locking mechanism. It is a figure which shows the electrical constitution of an inkjet printer. It is a figure which shows a jam processing routine. FIG. 10 is a diagram illustrating a paper feed path jam detection processing routine. It is a figure which shows a jam processing routine.

Explanation of symbols

1 Inkjet printer (printing device)
1a Case 2 Inkjet head (printing part)
2a Ink ejection surface 4 First door (first door)
5 Third door (second door)
6 Second door (second door)
17 Transport guide (transfer section)
18 Transport guide (transfer section)
31 Cap 40 Lock mechanism 50 Transport mechanism (transport section)
102 CPU
110 Lock mechanism control circuit P Paper (recording medium)

Claims (5)

A transport unit for transporting the recording medium;
A printing unit that performs printing on the recording medium conveyed by the conveyance unit;
Provided upstream and downstream of the transport unit, the Oite the recording medium on the upstream side of the transport unit is supplied to the transport section, to discharge the Oite the recording medium to the outside on the downstream side of the transport unit A transfer section;
A housing with built-in,
A first door which is provided in the housing and allows the user to approach the transport unit when opened;
A second door provided in the housing and allowing the user to approach the transfer section when opened;
A locking mechanism capable of prohibiting the opening of the first door;
First jam detecting means for detecting a jam of the recording medium in the transfer unit;
Lock control means for controlling the lock mechanism so that the first door is prohibited from opening when the first jam detection means detects a jam of the recording medium;
I have a,
Wherein when the first jam detecting means detects the jam of the recording medium, a printing apparatus, wherein a state near Rukoto the opening of the second door is allowed. The printing unit is an inkjet head having an ink ejection surface in which an ink ejection port from which ink is ejected is formed,
A cap capable of covering the ink ejection surface;
A cap execution unit that covers the ink ejection surface with the cap when the first jam detection unit detects a jam of the recording medium;
The printing apparatus according to claim 1, further comprising: A second jam detecting means for detecting a jam of the recording medium in the transport unit;
The lock control means is configured such that the first jam detection means detects a jam of the recording medium in the transfer section and the second jam detection means does not detect a jam of the recording medium in the transport section; and The first door is opened when the first jam detecting means detects the jam of the recording medium in the transfer section and the second jam detecting means detects the jam of the recording medium in the transport section. Control the locking mechanism so that is prohibited ,
When the first jam detection unit detects a jam of the recording medium in the transfer unit and the second jam detection unit does not detect a jam of the recording medium in the transport unit, and When the first jam detecting unit detects a jam of the recording medium and the second jam detecting unit detects a jam of the recording medium in the transport unit, the second door is allowed to open. The printing apparatus according to claim 1, wherein the printing apparatus is a printer.   The lock control unit controls the lock mechanism so that the first door is always allowed to open when the first jam detection unit does not detect a jam of the recording medium in the transfer unit. The printing apparatus according to claim 3, wherein:   The lock control means is only when the jam of the recording medium in the transfer unit is not detected by the first jam detection means and the jam of the recording medium in the transport unit is detected by the second jam detection means. The printing apparatus according to claim 3, wherein the lock mechanism is controlled so that the first door is allowed to open.

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