Medium transport device, and printer

Abstract

To provide a medium transport device that can suppress operation of a cutter unit in the state that the same is not properly installed.SOLUTION: A medium transport device comprises a transport part which transports a medium, a cutting part which cuts the medium, and a move part which reciprocates the cutting part in a movement direction. The cutting part has a cutter unit, and an installation part at which the cutter unit is attachable / detachable. The installation part has: a fitting part to which the cutter unit is fitted; a cover part which can displace between a closed state and an open state; and an interference part which is movable between a blockage position where displacement of the cover part from the open state to the closed state is blocked and a non-blockage position where displacement of the cover part from the open state to the closed state is not blocked. The interference part is positioned at the non-blockage position when the cutter unit is fitted to the fitting part, and is positioned at the blockage position when the cutter unit is not fitted to the fitting part.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] This disclosure relates to a media handling device and a printing device. [Background technology]

[0002] 2. Description of the Related Art Research and development is ongoing into printing devices that print images on print media.

[0003] In this regard, there is known a printing device that is detachable with a cutter unit that cuts print media such as roll paper (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-086235 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the printing device described in Patent Document 1, if the cutter unit is not installed, malfunction may occur. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present disclosure provides a printing apparatus including a conveying section that conveys a medium, a cutting section that cuts the medium conveyed by the conveying section, and a moving section that moves the cutting section back and forth in a movement direction that intersects with a conveying direction in which the medium is conveyed, the cutting section having a cutter unit and a mounting section to which the cutter unit is detachable, the mounting section having a mounting section to which the cutter unit is attached, a cover section that is displaceable between a closed state that covers the mounting section and an open state that does not cover the mounting section, and a cover section that is displaceable from the open state to the closed state by interfering with the cover section. This medium conveying device has an interference part that is movable between an obstructing position that obstructs displacement of the cover part to the closed state and a non-obstructing position that does not interfere with the cover part and thereby does not obstruct displacement of the cover part from the open state to the closed state, and when the cutter unit is attached to the mounting part, the interference part is located in the non-obstructing position and does not obstruct displacement of the cover part from the open state to the closed state, and when the cutter unit is not attached to the mounting part, the interference part is located in the obstructing position and obstructs displacement of the cover part from the open state to the closed state.

[0007] Another aspect of the present disclosure is a printing device including the medium transport device described above and a printing unit that prints an image on the medium transported by the transport unit. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an example of the appearance including the front surface of a printing device 1 according to an embodiment. [Figure 2] 2 is a perspective view showing an example of the appearance of the printing apparatus 1 shown in FIG. 1 including the rear surface. [Figure 3] 1 is a perspective view showing an example of a printing device 1 when the opening / closing cover BD is open at the rear. FIG. [Figure 4] FIG. 2 is a side view showing an example of the configuration of the cutting unit CT. [Figure 5] FIG. 5 is a perspective view of the cutting section CT shown in FIG. [Figure 6] 2 is a side cross-sectional view showing an example of the configuration of a paper feed tray TR. FIG. [Figure 7] 1 is a perspective view showing an example of a printing device 1 when a cutting unit CT is located at a home position. [Figure 8] 1 is a perspective view showing an example of a printing device 1 when a cutting unit CT is located at a replacement position. [Figure 9] 10 is a perspective view showing an example of the state of the cutting section CT when the cutter unit CU is replaced. FIG. [Figure 10] 10 is a perspective view showing an example of a state in which the cover part CV is in contact with the restricting member SLD when not in a closed state. FIG. [Figure 11] 10 is a top view showing an example of a cutting section CT when a cutter unit CU is attached to an attachment section AT. FIG. [Figure 12] 10 is a top view showing an example of the cutting section CT when the cutter unit CU is not attached to the attachment section AT. FIG. [Figure 13] 10 is a perspective view showing an example of a state in which a protrusion TR1 interferes with the upper surface of a contact member CN1 during displacement of a cover part CV from an open state to a closed state. FIG. [Figure 14] FIG. 2 is a diagram illustrating an example of the configuration of a dummy cutter unit DCU. [Figure 15] 1 is a perspective view showing an example of a printing device 1 equipped with a container unit CM. [Figure 16] FIG. 10 is a perspective view showing another example of the printing device 1 equipped with a container CM. [Figure 17] 1 is a diagram illustrating an example of a hardware configuration of a printing device 1. FIG. [Figure 18] 10 is a diagram showing an example of the flow of processing performed by the printing device 1 when an operation to issue an instruction to replace the cutter unit CU is accepted. FIG. [Figure 19] 10 is a perspective view showing another example of the state of the cutting section CT when the cutter unit CU is replaced. FIG. [Figure 20] 10 is a top view showing another example of the cutting section CT when the cutter unit CU is attached to the attachment section AT. FIG. [Figure 21]10 is a top view showing another example of the cutting section CT when the cutter unit CU is not attached to the attachment section AT. FIG. [Figure 22] 10 is a perspective view showing an example of a state in which a protrusion TR2 interferes with a cover part CV during displacement of the cover part CV from an open state to a closed state. FIG. [Figure 23] 10 is a perspective view showing yet another example of the state of the cutting section CT when the cutter unit CU is replaced. FIG. [Figure 24] 10 is a top view showing yet another example of the cutting part CT when the cutter unit CU is attached to the attachment part AT. FIG. [Figure 25] 10 is a top view showing an example of a state of the cutting portion CT in which the cover portion CV is in a closed state due to the projection portion TR3 being inserted into the opening H3. FIG. [Figure 26] FIG. 26 is a side cross-sectional view of the cutting portion CT shown in FIG. 25. [Figure 27] FIG. 10 is a top view showing yet another example of the cutting part CT when the cutter unit CU is not attached to the attachment part AT. [Figure 28] 10 is a side cross-sectional view showing an example of a state in which a protrusion TR3 interferes with a contact member CN3 during the displacement of a cover part CV from an open state to a closed state. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Embodiment> Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0010] <Outline of printing device according to embodiment> First, an overview of the printing apparatus according to the embodiment will be described.

[0011] A printing device according to an embodiment includes a medium transport device and a printing unit. The medium transport device includes a transport unit, a cutting unit, and a moving unit. The transport unit transports the medium. The cutting unit cuts the medium transported by the transport unit. The moving unit reciprocates the cutting unit in a movement direction intersecting the transport direction in which the medium is transported. The cutting unit includes a cutter unit having a cutter and a mounting unit to which the cutter unit can be attached or detached. The mounting unit includes an attachment unit, a cover unit, and an interference unit. The cutter unit is attached to the attachment unit. The cover unit is a member that can be displaced between a closed state in which it covers the attachment unit and an open state in which it does not cover the attachment unit. The interference unit is a member that can be moved between an obstructing position in which it interferes with the cover unit and obstructs displacement of the cover unit from the open state to the closed state, and a non-obstructing position in which it does not interfere with the cover unit and does not obstruct displacement of the cover unit from the open state to the closed state. The interference unit is positioned in the non-obstructing position when the cutter unit is attached to the attachment unit, and in the obstructing position when the cutter unit is not attached to the attachment unit. This makes it possible to prevent the printing device from operating in a state where the cutter unit is not installed.

[0012] The configuration of the printing device according to the embodiment will be described in detail below.

[0013] <Configuration of printing device according to embodiment> The configuration of a printing device according to an embodiment will be described below using the printing device 1 as an example.

[0014] In the following embodiment, for ease of explanation, a user of the printing device 1 will be referred to simply as a user. In this specification, the three-dimensional coordinate system TC is a three-dimensional Cartesian coordinate system that indicates directions in a diagram depicting the three-dimensional coordinate system TC. In the following, for ease of explanation, the X-axis in the three-dimensional coordinate system TC will be referred to simply as the X-axis. In the following, for ease of explanation, the Y-axis in the three-dimensional coordinate system TC will be referred to simply as the Y-axis. In the following, for ease of explanation, the Z-axis in the three-dimensional coordinate system TC will be referred to simply as the Z-axis. In the following, as an example, a case will be described in which the negative direction of the Z-axis coincides with the direction of gravity. Therefore, in the following, for ease of explanation, the positive direction of the Z-axis will be referred to as the upward direction or simply "up," and the negative direction of the Z-axis will be referred to as the downward direction or simply "down." In the following, for ease of explanation, the positive direction of the X-axis will be referred to as the forward direction or simply "forward," and the negative direction of the X-axis will be referred to as the backward direction or simply "rear."

[0015] Furthermore, for ease of explanation, the surface of the printing device 1 on the positive side of the X axis will be referred to as the front surface of the printing device 1, and the surface of the printing device 1 on the negative side of the X axis will be referred to as the rear surface of the printing device 1. The rear surface of the printing device 1 may also be referred to as the back surface of the printing device 1. Furthermore, the case where an object is viewed from a certain direction will be described below as the case where the object is viewed from that direction.

[0016] Fig. 1 is a perspective view showing an example of the appearance including the front side of a printing device 1 according to an embodiment. Fig. 2 is a perspective view showing an example of the appearance including the rear side of the printing device 1 shown in Fig. 1.

[0017] The printer 1 uses roll paper RP pulled out from a roll RB around which roll paper RP is wound, or cut paper CP as the printing medium, and prints an image on the printing medium. The cut paper CP may be any medium as long as it is a cut sheet-like medium, such as cut printing paper or a sticker mount.

[0018] The printing device 1 includes an operation unit PNL, a printing unit PR, a paper feed tray TR, a transport unit CA, a cutting unit CT, and an opening / closing cover BD. The printing device 1 may include other components, devices, etc. in addition to the operation unit PNL, printing unit PR, paper feed tray TR, transport unit CA, cutting unit CT, and opening / closing cover BD. To simplify the illustration, FIG. 1 depicts the printing unit PR, transport unit CA, and cutting unit CT as rectangular parallelepiped objects. To simplify the illustration, FIG. 1 depicts the printing unit PR, transport unit CA, and cutting unit CT in positions different from their actual locations. To simplify the illustration, FIG. 2 omits the printing unit PR, transport unit CA, and cutting unit CT.

[0019] The operation unit PNL is an input device that accepts operations. The operation unit PNL is, for example, a touch panel, but instead of or in addition to this, it may be configured to have hardware keys such as buttons. As shown in FIG. 1, in the printing device 1, the operation unit PNL is provided above the paper feed tray TR on the front side of the printing device 1. Note that the operation unit PNL may also be configured to be provided at another position on the front side of the printing device 1. Furthermore, the operation unit PNL may also be configured to be provided on a surface of the printing device 1 other than the front side.

[0020] The printing unit PR prints an image on a print medium conveyed by the printing device 1 from the paper feed tray TR.

[0021] The paper feed tray TR is a tray that can accommodate at least one of the aforementioned roll RB and one or more cut sheets CP as print media transported by the printing device 1. That is, the paper feed tray TR can accommodate only the roll RB, only one or more cut sheets CP, or both the roll RB and one or more cut sheets CP. The paper feed tray TR is also a tray that can slide parallel to a predetermined pull-out direction between a predetermined mounting position and a pull-out position. The following describes, as an example, a case where the pull-out direction coincides with the positive direction of the X-axis. The paper feed tray TR may be configured to be removable from the housing of the printing device 1, or may be configured to be non-removable from the housing of the printing device 1. The configuration of the paper feed tray TR will be described in detail below.

[0022] The transport unit CA transports, as a print medium, a roll of paper RP pulled out from a roll RB stored in the paper feed tray TR, or at least one of one or more cut sheets of paper CP stored in the paper feed tray TR. The transport unit CA is configured to include a plurality of rollers, a rotation mechanism for rotating each of the plurality of rollers, and the like.

[0023] The cutting unit CT cuts the roll paper RP as it is pulled out from the roll RB. The cutting unit CT is located at a predetermined position on the path along which the print medium passes as it is transported from the paper feed tray TR by the transport unit CA. For ease of explanation, this position will be referred to as the cutting position below.

[0024] The opening / closing cover BD is a cover for opening and closing an opening formed on the rear surface of the printing device 1. For ease of explanation, this opening will be referred to as the rear opening in the following description. In the example shown in FIG. 2, the opening / closing cover BD closes the rear opening. In this case, the user cannot see the inside of the printing device 1 through the rear opening. Meanwhile, FIG. 3 is a perspective view showing an example of the printing device 1 when the opening / closing cover BD is open. In this case, the user can see the inside of the printing device 1 through the rear opening. In the example shown in FIG. 3, the opening / closing cover BD is rotatable on the housing of the printing device 1 about an axis parallel to the Y axis, but it may also be configured to be rotatable about another axis.

[0025] The user can expose the cutting position by opening the rear opening with the opening / closing cover BD. Therefore, the cutting position is a position on the rear side of the printer 1 within the housing of the printer 1. In FIG. 3, the opening / closing cover BD opens the rear opening, so the cutting unit CT is exposed through the rear opening. The rear opening is an opening that the user uses to replace the cutter of the cutting unit CT, for example, when the cutter's sharpness becomes dull.

[0026] <Cutting section configuration> The configuration of the cutting section CT will be described below with reference to FIGS.

[0027] Fig. 4 is a side view showing an example of the configuration of the cutting unit CT. Fig. 5 is a perspective view of the cutting unit CT shown in Fig. 4. The dotted arrow PT shown in Fig. 4 indicates at least a part of the path of the print medium passing through the cutting position.

[0028] As shown in Figures 4 and 5, the cutting unit CT is mounted on the moving unit CR. That is, the printing device 1 includes the moving unit CR as well as the cutting unit CT. The moving unit CR is a member, such as a carriage, that moves the cutting unit CT back and forth in a movement direction that intersects with the transport direction in which the print medium is transported in the printing device 1. The following describes, as an example, a case in which the transport direction and the movement direction are perpendicular to each other. The following also describes, as an example, a case in which the movement direction is parallel to the Y axis.

[0029] The moving unit CR includes, for example, a motor MT, a driven pulley that is hidden behind the cutting unit CT in Figure 5 and is not visible, a timing belt TB stretched between the motor MT and the driven pulley, a scale SL, and an encoder EC. The moving unit CR also includes a base (not shown) that extends parallel to the direction of movement and to which the motor MT, the driven pulley, the timing belt TB, the scale SL, and the encoder EC are fixed. The moving unit CR may be configured to include other components in addition to the motor MT, the driven pulley, the timing belt TB, the scale SL, the encoder EC, and the base.

[0030] The moving unit CR is fixed to the timing belt TB and is capable of reciprocating movement parallel to the Y axis. Therefore, the cutting unit CT mounted on the moving unit CR is also capable of reciprocating movement parallel to the Y axis together with the moving unit CR. The position of the moving unit CR is detected by a disk-shaped scale SL and an encoder EC. Therefore, the printing device 1 can perform processing according to the detected position of the moving unit CR and can move the moving unit CR to a desired position. In other words, the printing device 1 can move the cutting unit CT to a desired position.

[0031] Here, the cutting unit CT has a cutter unit CU that has a movable blade BL1 as a cutter, a fixed blade BL2 that is mounted on a base of the moving unit CR and extends parallel to the base, and a mounting unit ST1 to which the cutter unit CU can be attached or detached. The following describes, as an example, a case in which the mounting unit ST1 is configured integrally with the moving unit CR, as shown in Figures 4 and 5. The mounting unit ST1 may also be configured separately from the moving unit CR. The configuration of the mounting unit ST1 will be described in detail below. The cutting unit CT moves back and forth together with the moving unit CR, with the movable blade BL1 abutting on the fixed blade BL2. This allows the cutting unit CT to cut the roll paper RP by clamping it between the movable blade BL1 and the fixed blade BL2.

[0032] <Paper tray configuration> The configuration of the paper feed tray TR will be described below with reference to Fig. 6. Fig. 6 is a side cross-sectional view showing an example of the configuration of the paper feed tray TR. In the example shown in Fig. 6, the paper feed tray TR stores a plurality of cut sheets CP together with a roll RB.

[0033] In the example shown in FIG. 6, the paper feed tray TR is a box-shaped tray with a recessed portion that opens upward. The shape of the paper feed tray TR may be other than the shape shown in FIG. 6. The space SP within the recessed portion of the paper feed tray TR is a space that can accommodate one or more cut sheets CP together with the roll RB. That is, the paper feed tray TR is a tray that can accommodate one or more cut sheets CP together with the roll RB. Hereinafter, for convenience of explanation, the components that make up the paper feed tray TR and that are involved in accommodating the roll RB will be referred to as the first storage portion CT1. Hereinafter, for convenience of explanation, the components that make up the paper feed tray TR and that are involved in accommodating one or more cut sheets CP will be referred to as the second storage portion CT2. A portion of the first storage portion CT1 may be integral with a portion of the second storage portion CT2. The first storage portion CT1 may also be a separate member from the second storage portion CT2.

[0034] The paper feed tray TR is supported by the housing BX so as to be slidable parallel to the pull-out direction between an attached position and an ejected position. The housing BX may be configured separately from the printing device 1 or may be configured integrally with the printing device 1. Below, as an example, a case where the housing BX is configured integrally with the printing device 1, as shown in FIG. 1, will be described. Here, the attached position is the position at which the paper feed tray TR can slide within the housing BX, at which the printer 1 ejects roll paper RP from the paper feed tray TR. The ejected position is the position at which the paper feed tray TR can slide within the housing BX, a predetermined distance away from the attached position in the pull-out direction. The predetermined distance may be any distance. For example, the ejected position is the position at which the paper feed tray TR can slide within the housing BX, the position closest to the pull-out direction. The paper feed tray TR may be removable from the housing BX, or may not be removable from the housing BX. Furthermore, when the housing BX is configured separately from the printing device 1, the housing BX may be configured to be provided on the paper feed tray TR.

[0035] When the paper feed tray TR is attached to the printing device 1, the surface of the paper feed tray TR on the positive side of the X axis forms part of the front surface of the printing device 1. Therefore, for the sake of convenience, the surface of the paper feed tray TR on the positive side of the X axis will be referred to as the front surface of the paper feed tray TR in the following description.

[0036] Here, the roll RB is accommodated in the paper feed tray TR so that it is located closer to the front of the paper feed tray TR than one or more cut sheets CP. That is, the first accommodation section CT1 is located closer to the front of the paper feed tray TR than the second accommodation section CT2. The roll RB is accommodated in the paper feed tray TR so that its axis is parallel to the front of the paper feed tray TR. The axis of the roll RB is the axis of rotation of the roll RB when the roll paper RP is pulled out from the roll RB accommodated in the first accommodation section CT1. In the example shown in FIG. 6, in the space SP, the roll RB is supported by a portion of the bottom surface of the paper feed tray TR and a member 10 provided above the bottom surface of the paper feed tray TR. Therefore, as shown in FIG. 6, the connection between the lowest surface forming the space SP and the surface forming the space SP closest to the front of the paper feed tray TR is curved to follow the outer circumferential surface of the roll RB in a direction perpendicular to the axis of the roll RB. For convenience of explanation, the connection portion will be referred to as the target connection portion below.

[0037] The member 10 has a wound body support region 10A and a cut-sheet support region 10B. The wound body support region 10A is a region of the member 10 that has a curved surface that curves along the outer circumferential surface of the wound body RB in a direction perpendicular to the axis of the wound body RB. Therefore, the wound body RB is rotatably supported within the space SP by the target connection portion and the curved surface. Therefore, in the example shown in FIG. 6, the first storage section CT1 described above is composed of the target connection portion and the wound body support region 10A. The cut-sheet support region 10B is a plate-shaped region of the member 10 that has a placement surface on which one or more cut sheets CP are placed. Therefore, in this example, the second storage section CT2 described above is composed of the cut-sheet support region 10B. The bottom surfaces of the wound body support region 10A and the cut-sheet support region 10B are connected without any steps. The roll support portion 10A and the cut paper support portion 10B may be configured to be separated from each other and not connected to each other.

[0038] Furthermore, member 10 is spaced above the lowest surface that defines space SP. That is, there is a gap between this surface and member 10 in paper feed tray TR. This gap functions as a roll paper passage PP along which roll paper RP passes as it is pulled from roll RB into the interior of printer 1. Note that Figure 6 shows roll paper RP being pulled into printer 1 through roll paper passage PP.

[0039] An opening HL is formed in the cut-sheet support section 10B. The opening HL is formed so that the paper feed roller R1 can come into contact with the roll paper RP passing through the roll paper passage PP when no cut sheets CP are stored in the second storage section CT2. The opening HL may be openable and closable by a plate-like member such as a flap.

[0040] One or more cut sheets CP stored in a paper feed tray TR attached to the printing device 1 are transported one by one into the interior of the printing device 1 by a paper feed roller R1 provided in the printing device 1. The rotation axis of the paper feed roller R1 is parallel to the axis of the roll RB. The paper feed roller R1 is located above and on the front side of the paper feed roller R1, and is provided in the printing device 1 so as to be able to swing around a rotation axis AX1 that is parallel to the axis of the roll RB.

[0041] The paper feed roller R1 also transports roll paper RP pulled from a roll RB stored in a paper feed tray TR attached to the printing device 1 into the interior of the printing device 1. If cut sheets CP are not stored in the paper feed tray TR, the paper feed roller R1 comes into contact with the roll paper RP, which has been manually pulled from the roll RB by the user to the roll paper passage PP, through the opening HL. This allows the paper feed roller R1 to transport the roll paper RP into the interior of the printing device 1.

[0042] As shown in Figure 6, the roll paper RP transported by the paper feed roller R1 passes between the print head C2 supported by the carriage C1 of the printer 1 and the platen C3 of the printer 1, whereby an image is printed. The carriage C1, print head C2, and platen C3 each make up the printing unit PR in the printer 1. The roll paper RP pulled out from the roll RB after an image has been printed by the printing unit PR is separated by a cutting unit CT, which cuts the roll paper RP, from the roll paper RP pulled out from the roll RB before an image has been printed by the printing unit PR. For this reason, in the printer 1, the cutting unit CT is located upstream of the printing unit PR on the transport path of the roll paper RP.

[0043] As described above, in the paper feed tray TR, the roll paper RP pulled out from the roll RB and one or more cut sheets CP are each transported by the paper feed roller R1.

[0044] <About platform locations and interchange locations> Hereinafter, a description will be given of a predetermined home position and replacement position among the positions where the cutting unit CT can be located, with reference to Figures 7 and 8. Figure 7 is a perspective view showing an example of the printing device 1 when the cutting unit CT is located at the home position. Figure 8 is a perspective view showing an example of the printing device 1 when the cutting unit CT is located at the replacement position.

[0045] Here, the home position refers to a predetermined position, among all possible positions for the cutting unit CT, where the cutting unit CT begins cutting the roll paper RP. In the example shown in FIG. 7, the home position is the position where the cutting unit CT is located in FIG. 7. That is, in this example, the home position is the position furthest along the negative Y-axis among all possible positions for the cutting unit CT. However, in this example, a portion of the cutting unit CT located at the home position is obscured by a plate-shaped restricting member SLD provided on the printing device 1 so as to cover the area above the home position at the rear opening. More specifically, in this example, the cutter unit CU attached to the mounting portion ST1 of the cutting unit CT located at the home position is obscured by a plate-shaped restricting member SLD provided on the printing device 1 so as to cover the area above the home position at the rear opening. For this reason, the user cannot replace the cutter unit CU when the cutting unit CT is located at the home position. The restricting member SLD has the function of restricting the movement of the cutting unit CT. This function will be described later. 7 and 8, the surface of the plate-shaped regulating member SLD is parallel to the rear surface of the printing device 1, but this is merely an example and the surface may be non-parallel to the rear surface of the printing device 1. Furthermore, instead of a plate-shaped member, the regulating member SLD may be a member of another shape that has the same function as the plate-shaped regulating member SLD. Furthermore, in this example, the regulating member SLD is provided above the movement path of the cutting unit CT, but instead, it may be configured to be provided somewhere other than above the movement path of the cutting unit CT.

[0046] On the other hand, the replacement position is a position that is predetermined as a position where the cutter unit CU is replaced among the positions at which the cutting unit CT can be located. In the example shown in Fig. 8, the replacement position is the position at which the cutting unit CT is located in Fig. 8. That is, in this example, the replacement position is the position that is located furthest on the positive side of the Y axis among the positions at which the cutting unit CT can be located.

[0047] The replacement position is not covered by the restricting member SLD. Therefore, the cutting part CT located at the replacement position is exposed as shown in Fig. 8. Therefore, when the cutting part CT is located at the replacement position, the user can replace the cutter unit CU.

[0048] The printing device 1 moves the position of the cutting unit CT to either the home position or the replacement position depending on the received command, instruction, operation, etc. For example, when the printing device 1 receives a print job including an instruction to have the printing device 1 print an image on a print medium, the printing device 1 moves the position of the cutting unit CT to the home position. Then, the printing device 1 cuts the print medium as necessary using the cutting unit CT. On the other hand, when the printing device 1 receives an instruction to replace the cutter unit CU, for example, the printing device 1 moves the position of the cutting unit CT to the replacement position.

[0049] <Configuration of the attachment part> The configuration of the mounting part ST1 of the cutting part CT will be described below with reference to Figures 9 to 13. Figure 9 is a perspective view showing an example of the state of the cutting part CT when the cutter unit CU is replaced.

[0050] As shown in FIG. 9, the mounting portion ST1 has an attachment portion AT, a cover portion CV, and an interference portion IF1.

[0051] The mounting part AT is a member to which the cutter unit CU is attached. The mounting part AT has a mounting surface on which the cutter unit CU is placed. On both sides of the mounting surface in the movement direction of the moving part CR, side walls protrude upward to sandwich and support the cutter unit CU placed on the mounting surface. Therefore, the cutter unit CU is attached to the mounting part AT by sliding it on the mounting surface in a predetermined installation direction. Figure 9 shows the cutter unit CU just before it is attached to the mounting part AT. Therefore, the cutter unit CU shown in Figure 9 is not abutting against the mounting surface.

[0052] The cover part CV is a member that can be displaced between a closed state that covers the mounting part AT and an open state that does not cover the mounting part AT. The cover part CV is a member that sandwiches and fixes the cutter unit CU placed on the mounting surface between the mounting surface and the cover part CV. In the example shown in FIG. 9, the cover part CV is provided on the side wall of the mounting part AT so as to be rotatable around a rotation axis parallel to the movement direction of the moving part CR. Therefore, after attaching the cutter unit CU to the mounting part AT, the user manually moves the cover part CV to change from the open state to the closed state. This allows the user to attach the cutter unit CU to the mounting part ST1. As shown in FIG. 9, the cutter unit CU has a grip part HND. The grip part HND is a member that is gripped by the user when lifting the cutter unit CU. This allows the printing device 1 to improve the gripping ability of the cutter unit CU while improving the positioning accuracy of the cutter unit CU to the mounting part AT. The grip portion HND is inserted into the opening of the cover portion CV when the cover portion CV is shifted from the open state to the closed state, and therefore the grip portion HND does not restrict the shift of the cover portion CV from the open state to the closed state.

[0053] Furthermore, the cover portion CV in the closed state is locked to the mounting portion AT. Specifically, the cover portion CV is locked to the mounting portion AT by a lever lock composed of a first protrusion PT1 that engages with the opening of a first opening HL1 provided in the mounting portion AT, a first lever LV1 that extends upward from the first protrusion PT1, a second protrusion PT2 that engages with the opening of a second opening HL2 provided in the mounting portion AT, and a second lever LV2 that extends upward from the second protrusion PT2. Here, the first protrusion PT1 protrudes from the cover portion CV in the positive direction of the Y axis. Meanwhile, the second protrusion PT2 protrudes from the cover portion CV in the negative direction of the Y axis. Therefore, the first protrusion PT1 and the first lever LV1, and the second protrusion PT2 and the second lever LV2, face each other. However, in FIG. 9, the second protrusion PT2 is hidden behind the second lever LV2 and is not visible. When the cover part CV is shifted from the open state to the closed state, the first protrusion PT1 engages with the opening of the first opening HL1. Furthermore, when the cover part CV is shifted from the open state to the closed state, the second protrusion PT2 engages with the opening of the second opening HL2. As a result, the cover part CV in the closed state is locked to the attachment part AT. The user can then move the upper ends of the first lever LV1 and the second lever LV2 closer to each other to release the engagement between the first protrusion PT1 and the opening of the first opening HL1 and the engagement between the second protrusion PT2 and the opening of the second opening HL2. Therefore, the user can release the lock of the cover part CV to the attachment part AT by moving the upper ends of the first lever LV1 and the second lever LV2 closer to each other, thereby lifting the cover part CV from the attachment part AT and shifting the cover part CV from the closed state to the open state.

[0054] The interference part IF1 is a member that can move between an obstructing position where it interferes with the cover part CV and obstructs displacement of the cover part CV from the open state to the closed state, and a non-obstructing position where it does not interfere with the cover part CV and does not obstruct displacement of the cover part CV from the open state to the closed state. Here, the interference part IF1 is pushed by the cutter unit CU and moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This allows the cover part CV to move from the open state to the closed state without interfering with the interference part IF1. Meanwhile, during the process of removing the cutter unit CU from the mounting part AT, the interference part IF1 moves from the non-obstructing position to the obstructing position due to a biasing member such as a spring. This means that when the cutter unit CU is not attached to the mounting part AT, the cover part CV interferes with the interference part IF1 and cannot move from the open state to the closed state.

[0055] Fig. 10 is a top view showing an example of the cutting part CT when the cutter unit CU is attached to the attachment part AT, however, in Fig. 10, the cover part CV is omitted to clearly show the positional relationship between the cutter unit CU and the interference part IF1.

[0056] 10, the interference part IF1 has, for example, a contact member CN1 and a biasing member SP1. Note that the interference part IF1 may be configured to include other members in addition to the contact member CN1 and the biasing member SP1.

[0057] The contact member CN1 is a member that can come into contact with the cutter unit CU. In the example shown in FIG. 10, the contact member CN1 is a plate-shaped member that is biased by a biasing member SP1 toward the space in the mounting part AT where the cutter unit CU is placed. That is, the biasing member SP1 is a member that biases the contact member CN1 toward the space in the mounting part AT where the cutter unit CU is placed, such as, but not limited to, a spring. By including the biasing member SP1 in the interference part IF1, the printing device 1 can achieve interference between the interference part IF1 and the cover part CV with a simple configuration when the cutter unit CU is not attached to the mounting part AT. Furthermore, the contact member CN1 is a member having a plate-shaped portion parallel to the mounting surface of the mounting part AT. Here, the cutter unit CU is attached to the mounting part AT in the mounting direction, as described above. The contact member CN1 is inclined so that it extends toward the biasing direction A1 in which the biasing member SP1 biases the contact member CN1 as it approaches the mounting direction. Therefore, when the user slides the cutter unit CU on the mounting surface in the installation direction, the interference part IF1 is pushed by the cutter unit CU and moves in the direction opposite to the biasing direction A1. As a result, the interference part IF1 moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This is useful because it makes it easier for the user to notice that the cutter unit CU is not properly attached to the mounting part AT without reducing the ease of attachment of the cutter unit CU. The position of the interference part IF1 shown in Figure 10 is an example of the non-obstructing position.

[0058] The contact member CN1 also has an opening H1. The opening H1 is an opening through which the protrusion TR1 of the cover portion CV is inserted. Here, the protrusion TR1 is a portion of the cover portion CV that protrudes toward the contact member CN1 when the cover portion CV is in the closed state. FIG. 9 shows the protrusion TR1 protruding from the cover portion CV in the open state. The non-obstruction position described above is also the position where the protrusion TR1 is inserted into the opening H1 when the cover portion CV moves from the open state to the closed state. Therefore, when the contact member CN1 is not in the non-obstruction position, the protrusion TR1 does not pass through the opening H1 and interferes with the upper surface of the contact member CN1. As a result, in this case, the cover portion CV cannot move from the open state to the closed state. FIG. 11 is a top view showing an example of the cutting portion CT when the cutter unit CU is not attached to the attachment portion AT. Note that the cover portion CV is omitted from FIG. 11 to clearly show the position of the interference portion IF1. As shown in FIG. 11 , in this case, the opening H1 is located closer to the biasing direction A1 than the position of the opening H1 shown in FIG. 11 . Therefore, as shown in FIG. 12 , the protrusion TR1 does not pass through the opening H1 and interferes with the upper surface of the contact member CN1 during displacement of the cover part CV from the open state to the closed state. FIG. 12 is a perspective view showing an example of the protrusion TR1 interfering with the upper surface of the contact member CN1 during displacement of the cover part CV from the open state to the closed state. In the example shown in FIG. 12 , the interference part IF1 is located in the obstructing position. In this case, the protrusion TR1 does not pass through the opening H1. As a result, as shown in FIG. 12 , the protrusion TR1 is in contact with the contact member CN1. Therefore, in this example, the cover part CV cannot be displaced from the open state to the closed state. The opening H1 is an example of a first opening. The protrusion TR1 is an example of a first protrusion. The contact member CN1 is an example of a first contact member. The biasing member SP1 is an example of a first biasing member.

[0059] In a printing device 1 equipped with a cutting unit CT having a mounting unit ST1 configured as described above, the interference unit IF1 is positioned in the non-obstructing position when the cutter unit CU is attached to the mounting unit AT, and is positioned in the obstructing position when the cutter unit CU is not attached to the mounting unit AT. This prevents the cover CV from shifting from the open state to the closed state when the cutter unit CU is not attached to the mounting unit AT, visually informing the user that the cutter unit CU is not attached to the mounting unit AT. The cutter unit CU may not be attached when, for example, the user forgets to attach the cutter unit CU. Therefore, the printing device 1 can be prevented from operating without the cutter unit CU attached to the mounting unit AT. Furthermore, the printing device 1 can be prevented from increasing the total time required to print an image on a print medium compared to when the user realizes that the cutter unit CU is not attached to the mounting unit AT after operating the printing device 1. Furthermore, in the printing device 1, not only when the user forgets to attach the cutter unit CU, but also when the cutter unit CU is not placed in the predetermined position on the mounting surface of the mounting portion AT, the cover portion CV cannot be moved from the open state to the closed state, thereby visually informing the user that the cutter unit CU is not properly attached to the mounting portion AT. As a result, the printing device 1 can be prevented from operating with the cutter unit CU improperly attached. Furthermore, the printing device 1 allows the user to easily position the cover portion CV by inserting the protrusion portion TR1 into the opening H1. This is useful, as it improves the usability of the printing device 1. Furthermore, in the printing device 1, because both the cover portion CV and the interference portion IF1 are provided on the mounting portion ST1, which is integrally configured with the moving portion CR, the positional accuracy of the cover portion CV and the interference portion IF1 can be improved, making it easier to insert the protrusion portion TR1 into the interference portion IF1. This is useful, as it reduces the occurrence of defective products due to assembly errors, etc.

[0060] <Dummy cutter unit> The printing device 1 described above may be configured to include a dummy cutter unit DCU. In this case, a dummy cutter unit DCU, which is a dummy cutter unit CU, can be attached to the attachment part AT. The dummy cutter unit DCU is a member that is attached to the attachment part AT in place of the cutter unit CU to make the printing device 1 usable during the period when the cutter unit CU is removed from the printing device 1 for reasons such as replacement.

[0061] FIG. 13 shows an example of the configuration of the dummy cutter unit DCU. The dummy cutter unit DCU is a component with approximately the same shape as the cutter unit CU with the movable blade BL1 removed. Therefore, the dummy cutter unit DCU can be attached to the mounting part AT. During the process of attaching the dummy cutter unit DCU to the mounting part AT, the interference part IF1 moves from the obstructing position to the non-obstructing position. Therefore, the cover part CV can be shifted from the open state to the closed state when the dummy cutter unit DCU is attached to the mounting part AT instead of the cutter unit CU. However, it cannot be shifted from the open state to the closed state when the dummy cutter unit DCU is not attached to the mounting part AT instead of the cutter unit CU. This allows the printing device 1 to perform functions other than cutting the roll paper RP with the cutting unit CT by attaching the dummy cutter unit DCU to the mounting part AT, even if the cutter unit CU must be removed from the mounting part AT for some reason. Functions other than cutting the roll paper RP with the cutting unit CT include, but are not limited to, transporting cut sheets CP without using the cutting unit CT. Furthermore, as mentioned above, one example of a situation in which the cutter unit CU must be removed from the mounting part AT is when the cutter unit CU needs to be replaced. If the cutter unit CU becomes unusable due to damage or other reasons, the user must replace it. However, if the user does not have a spare cutter unit, the printing device 1 will be unusable while the cutter unit CU is removed from the mounting part AT. Therefore, if the printing device 1 is equipped with a dummy cutter unit DCU as described above, by attaching the dummy cutter unit DCU to the mounting part AT, the printing device 1 can perform functions other than cutting the roll paper RP with the cutting unit CT. This is useful and leads to improved usability of the printing device 1.

[0062] When the printing device 1 includes a dummy cutter unit DCU, the printing device 1 may also include a storage unit CM that stores the dummy cutter unit DCU. FIG. 14 is a perspective view showing an example of a printing device 1 that includes a storage unit CM. In the example shown in FIG. 14, the storage unit CM is provided on the rear of the printing device 1. More specifically, the storage unit CM is provided on the rear of the printing device 1 in a position that is covered by the opening / closing cover BD in the closed position, but not covered by the opening / closing cover BD in the open position. This prevents the printing device 1 from losing the dummy cutter unit DCU when it is not in use. Furthermore, this allows the user to remove the cutter unit CU from the mounting part AT without moving to another side of the printing device 1 and then attach the removed dummy cutter unit DCU to the mounting part AT. As a result, the usability of the printing device 1 can be improved. Note that this is merely an example, and the storage unit CM may be provided in another position on the rear of the printing device 1. For example, the storage unit CM may be configured to be provided in a position that is not covered by the opening / closing cover BD that is positioned in the open position and the closed position on the rear surface of the printing device 1. In this case, the storage unit CM may be configured to be provided with a cover that can be opened and closed between a position that exposes the inside of the storage unit CM and a position that does not expose the inside of the storage unit CM.

[0063] The storage unit CM may also be provided on another surface instead of the rear surface of the printing device 1. FIG. 15 is a perspective view showing another example of a printing device 1 equipped with a storage unit CM. In the example shown in FIG. 15, the storage unit CM is provided on the front surface of the printing device 1. More specifically, in this example, the storage unit CM is provided next to the paper feed tray TR. In this case, the user can remove the dummy cutter unit DCU while operating the printing device 1. More specifically, the user can remove the dummy cutter unit DCU while, for example, issuing an instruction to replace the cutter unit CU on the operation unit PNL. This is useful because it helps prevent users from forgetting to remove the dummy cutter unit DCU. In other words, the printing device 1 can improve its usability. Even in this case, the opening / closing cover BD is provided on the rear surface of the printing device 1. Therefore, the printing device 1 can make it difficult for users to open and close the opening / closing cover BD, thereby preventing unintended contact between the cutting unit CT and the user. This is useful as it also helps prevent malfunctions in the cutting unit CT due to contact with the user. Furthermore, the printing device 1 may be configured to include an LED (Light Emitting Diode) or the like that emits light to indicate the position of the storage unit CM when the operation is accepted. Furthermore, if the storage unit CM is provided on the front of the printing device 1, the storage unit CM may be configured to include a cover that can be opened and closed between a position that exposes the interior of the storage unit CM and a position that does not expose the interior of the storage unit CM.

[0064] The printing device 1 may be configured to include a detection unit that detects whether the cutter unit CU or the dummy cutter unit DCU is attached to the mounting part AT. In this case, for example, when an operation to use the cutting part CT is instructed while the dummy cutter unit DCU is attached to the mounting part AT, the printing device 1 may report an error. The detection unit may distinguish whether the unit attached to the mounting part AT is the cutter unit CU or the dummy cutter unit DCU based on, for example, differences in the shape of the cutter unit CU and the dummy cutter unit DCU. These shape differences may include, but are not limited to, the presence or absence of recesses or protrusions. The detection unit may be, but is not limited to, a contact sensor, an optical sensor, or the like. The detection unit may be provided on a member other than the mounting part ST1, on the mounting part AT, or in some other configuration. The printing device 1 may be configured to detect whether the cutter unit CU or the dummy cutter unit DCU is attached to the mounting part AT based on whether the dummy cutter unit DCU is housed in the housing part CM. In this case, for example, if the detection unit detects that the dummy cutter unit DCU is housed in the storage unit CM, the printing device 1 determines that the cutter unit CU is attached to the attachment unit AT. On the other hand, in this case, for example, if the detection unit detects that the dummy cutter unit DCU is not housed in the storage unit CM, the printing device 1 determines that the dummy cutter unit DCU is attached to the attachment unit AT. Also, in this case, the printing device 1 may be configured to notify an error when the detection unit detects that the dummy cutter unit DCU is not housed in the storage unit CM. This is a configuration in which an error is notified to prompt the user to check, because even if the dummy cutter unit DCU is not housed in the storage unit CM, this does not necessarily mean that the dummy cutter unit DCU is attached to the attachment unit AT.The printing device 1 may be configured to display information indicating the usage status of each of the cutter unit CU and dummy cutter unit DCU on the operation unit PNL in accordance with the detection results of the detection unit.The printing device 1 may also be configured to cause an LED to emit light indicating the usage status of each of the cutter unit CU and dummy cutter unit DCU in accordance with the detection results of the detection unit.In this case, the printing device 1 is equipped with an LED.

[0065] The storage unit CM may also be configured to be provided in the paper feed tray TR. In this case, the storage unit CM may be configured to be provided in a dead space within the paper feed tray TR. Furthermore, if the printing device 1 is equipped with an ADF (Auto Document Feeder), the storage unit CM may be configured to be provided inside the housing with the ADF open.

[0066] <Hardware configuration of the printing device> The hardware configuration of the printing device 1 will be described below with reference to Fig. 16. Fig. 16 is a diagram showing an example of the hardware configuration of the printing device 1.

[0067] The printing device 1 includes, for example, a control unit 11, a storage unit 12, a communication unit 13, an operation unit PNL, a printing unit PR, a moving unit CR, and a transport unit CA. These components are connected to each other via a bus so that they can communicate with each other. The printing device 1 also communicates with other devices, such as information processing devices, via the communication unit 13. Examples of such information processing devices include, but are not limited to, notebook PCs (Personal Computers), desktop PCs, workstations, tablet PCs, multi-function mobile phone terminals (smartphones), and PDAs (Personal Digital Assistants).

[0068] The control unit 11 controls the entire printing device 1. The control unit 11 includes a processor such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array). The control unit 11 executes various programs stored in the storage unit 12, for example, to perform various processes performed by the printing device 1.

[0069] The storage unit 12 is a storage device that includes, for example, a hard disk drive (HDD), a solid state drive (SSD), an electrically erasable programmable read-only memory (EEPROM), a read-only memory (ROM), and a random access memory (RAM). Note that instead of being built into the printing device 1, the storage unit 12 may be an external storage device connected via a digital input / output port such as a universal serial bus (USB). The storage unit 12 stores various types of information, images, and programs processed by the printing device 1. In other words, the various types of information stored in the printing device 1 are stored in the storage unit 12.

[0070] The communication unit 13 is a communication device that includes, for example, a digital input / output port such as a USB, an Ethernet (registered trademark) port, an antenna for wireless communication, and the like.

[0071] <Processing performed by the printing device when an operation to instruct to replace the cutter unit is received> The following describes the processing performed by the printing device 1 when an operation to instruct replacement of the cutter unit CU is accepted, with reference to Fig. 17. Fig. 17 is a diagram showing an example of the flow of processing performed by the printing device 1 when an operation to instruct replacement of the cutter unit CU is accepted. As an example, the following describes a case where the power to the printing device 1 is turned on at a timing before the processing of step S110 shown in Fig. 17 is carried out.

[0072] The control unit 11 waits until it receives an operation to instruct replacement of the cutter unit CU (step S110). In Fig. 17, the process of step S110 is indicated by "replacement instruction?".

[0073] When the control unit 11 determines that an operation to instruct replacement of the cutter unit CU has been received (step S110-YES), it controls the moving unit CR to move the cutting unit CT to the replacement position (step S120), and ends the processing of the flowchart shown in Fig. 17. In Fig. 17, the processing of step S120 is indicated by "moving cutting unit."

[0074] Through the above process, the printing device 1 can automatically move the cutting unit CT to the replacement position without requiring the user to move the cutting unit CT by accepting an operation to replace the cutter unit CU. As a result, the printing device 1 can improve its usability. Here, the printing device 1 moves the cutting unit CT to the replacement position by accepting the operation. Therefore, by moving the cutting unit CT from the replacement position to the home position, it is possible to determine whether the cutter unit CU is properly attached to the mounting unit AT. This is useful because it simplifies the control for determining whether the cutter unit CU is properly attached to the mounting unit AT. The printing device 1 may also be configured to include an alarm unit that notifies the user if the cutting unit CT does not return from the replacement position to the home position. The alarm unit may be an LED, a display, a speaker, a vibrator, or any other component capable of providing an alarm. In the printing device 1, the user may manually move the cutting unit CT to the replacement position. As described above, the cutter unit CU of the cutting unit CT is covered by the restricting member SLD when in the home position. This is useful because it encourages the user to move the cutting unit CT to the replacement position when replacing the cutter unit CU. The printing device 1 may also be configured to include a detection unit that detects whether the opening / closing cover BD is open or closed. In this case, the printing device 1 may be configured to accept the opening of the rear opening by the opening / closing cover BD as an operation to issue a command to replace the cutter unit CU.

[0075] When the cover unit CV is not in the closed state, the cutting unit CT contacts the aforementioned regulating member SLD as the moving unit CR moves from the replacement position to the home position, as shown in FIG. 18 . FIG. 18 is a perspective view illustrating an example of the cover unit CV contacting the regulating member SLD when the cover unit CV is not in the closed state. In the example shown in FIG. 18 , the second lever LV2 of the cover unit CV contacts the regulating member SLD. This allows the printing device 1 to achieve interference between the regulating member SLD and the cover unit CV when the cover unit CV is not in the closed state without increasing the angle at which the cover unit CV opens relative to the attachment unit AT. As a result, the printing device 1 can also prevent the length of the protrusion TR1 from increasing. This is useful because it leads to the prevention of an increase in the size of both the cutting unit CT and the printing device 1. Note that the portion of the cover unit CV that contacts the regulating member SLD may be another portion instead of the second lever LV2. The second lever LV2 is an example of a contacted portion. In this way, the regulating member SLD regulates the movement of the cover unit CV by the movable unit CR when the cover unit CV is not in the closed state. On the other hand, the regulating member SLD does not regulate the movement of the cover unit CV by the movable unit CR when the cover unit CV is in the closed state. This allows the printing device 1 to determine that the cutter unit CU is not properly attached to the mounting unit ST1. As a result, the printing device 1 can prevent operation when the cutter unit CU is not properly attached to the mounting unit AT, i.e., when the cover unit CV is not in the closed state. An example of an improperly attached cutter unit CU is when the cutter unit CU is not placed in a predetermined position on the mounting surface of the mounting unit AT as the cutter unit CU mounting position, when the cover unit CV is not in the closed state despite the cutter unit CU being placed in that position, or when the cutter unit CU is not attached to the mounting unit AT. This also allows the printing device 1 to prevent malfunctions even if the user does not notice that the cutter unit CU is not properly attached to the mounting unit AT.Furthermore, the printing device 1 can prevent the cutter unit CU from becoming larger than in a configuration in which the cutter unit CU interferes with the regulating member SLD when the cutter unit CU is not properly attached to the attachment part AT. Note that at least a portion of the regulating member SLD may be configured to cover the area above the home position as well as the area above between the home position and the replacement position.

[0076] As described above, the printing device 1 includes a transport unit CA that transports the print medium, a cutting unit CT that cuts the print medium transported by the transport unit CA, and a moving unit CR that reciprocates the cutting unit CT in a movement direction that intersects the transport direction of the print medium. The cutting unit CT includes a cutter unit CU with a cutter and a mounting unit ST1 to which the cutter unit CU can be attached. The mounting unit ST1 includes an attachment unit AT to which the cutter unit CU is attached, a cover unit CV that is movable between a closed state that covers the attachment unit AT and an open state that does not cover the attachment unit AT, and an interference unit IF1 that is movable between an obstructing position that interferes with the cover unit CV to obstruct movement of the cover unit CV from the open state to the closed state and a non-obstructing position that does not interfere with the cover unit CV and does not obstruct movement of the cover unit CV from the open state to the closed state. The interference unit IF1 is located in the non-obstructing position when the cutter unit CU is attached to the attachment unit AT and in the obstructing position when the cutter unit CU is not attached to the attachment unit AT. This prevents the printing device 1 from operating with the cutter unit CU improperly attached.

[0077] In the printing device 1 described above, the conveying unit CA, cutting unit CT, and moving unit CR may be configured as a medium conveying device that conveys the print medium. The medium conveying device may also be provided in another device that needs to convey the medium, instead of the printing device 1. In this case, the medium may be the same medium as the print medium, or may be a different medium from the print medium.

[0078] <First Modification of the Embodiment> A first modification of the embodiment will be described below with reference to Figures 19 to 22. In the first modification of the embodiment, the cutting unit CT has a mounting part ST2 instead of the mounting part ST1. Figure 19 is a perspective view showing another example of the state of the cutting unit CT when the cutter unit CU is replaced.

[0079] As shown in FIG. 19, the mounting portion ST2 has an attachment portion AT, a cover portion CV, and an interference portion IF2.

[0080] Like the interference part IF1, the interference part IF2 is a member that can move between an obstructing position where it interferes with the cover part CV and obstructs displacement of the cover part CV from the open state to the closed state, and a non-obstructing position where it does not interfere with the cover part CV and does not obstruct displacement of the cover part CV from the open state to the closed state. Here, the interference part IF2 is pushed by the cutter unit CU and moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This allows the cover part CV to move from the open state to the closed state without interfering with the interference part IF2. Meanwhile, during the process of removing the cutter unit CU from the mounting part AT, the interference part IF2 moves from the non-obstructing position to the obstructing position due to a biasing member such as a spring. This means that when the cutter unit CU is not attached to the mounting part AT, the cover part CV interferes with the interference part IF2 and cannot move from the open state to the closed state.

[0081] Fig. 20 is a top view showing another example of the cutting part CT when the cutter unit CU is attached to the attachment part AT, in which the cover part CV is omitted to clearly show the positional relationship between the cutter unit CU and the interference part IF2.

[0082] 20, the interference part IF2 has, for example, a contact member CN2 and a biasing member SP2. Note that the interference part IF2 may be configured to include other members in addition to the contact member CN2 and the biasing member SP2.

[0083] The contact member CN2 is a member that can come into contact with the cutter unit CU. In the example shown in FIG. 20, the contact member CN2 is a member that is biased by a biasing member SP2 toward the space in the mounting part AT where the cutter unit CU is placed. That is, the biasing member SP2 is a member that biases the contact member CN2 toward the space in the mounting part AT where the cutter unit CU is placed, such as, but not limited to, a spring. In the printing device 1, by having the biasing member SP2 in the interference part IF2, interference between the interference part IF2 and the cover part CV when the cutter unit CU is not attached to the mounting part AT can be achieved with a simple configuration. Furthermore, the contact member CN2 is a member having a plate-shaped portion parallel to the mounting surface of the mounting part AT. Here, the cutter unit CU is attached to the mounting part AT in the mounting direction, as described above. The contact member CN2 is inclined so that it extends toward the biasing direction A2 in which the biasing member SP2 biases the contact member CN2 as it approaches the mounting direction. Therefore, when the user slides the cutter unit CU on the mounting surface in the installation direction, the interference part IF2 is pushed by the cutter unit CU and moves in the direction opposite to the biasing direction A2. As a result, the interference part IF2 moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This is useful because it makes it easier for the user to notice that the cutter unit CU is not properly attached to the mounting part AT without reducing the ease of attachment of the cutter unit CU. The position of the interference part IF2 shown in Figure 20 is an example of the non-obstructing position.

[0084] Unlike the contact member CN1, the contact member CN2 does not have an opening. Instead, the contact member CN2 has a protrusion TR2. The protrusion TR2 is a portion of the contact member CN2 that protrudes in a direction perpendicular to the mounting surface toward the space in which the cutter unit CU is mounted in the mounting portion AT. In the example shown in FIG. 20, the protrusion TR2 protrudes in the protrusion direction from the end of the contact member CN2 closest to the biasing member SP2. Therefore, in the first modified embodiment, the non-obstruction position is a position where the protrusion TR2 does not interfere with the cover part CV when the cover part CV moves from the open state to the closed state. On the other hand, in the first modified embodiment, the obstruction position is a position where the protrusion TR2 interferes with the cover part CV when the cover part CV moves from the open state to the closed state. The protrusion TR2 interferes with the cover part CV when the contact member CN2 is not positioned in the non-obstruction position. As a result, the cover part CV cannot be displaced from the open state to the closed state. FIG. 21 is a top view showing another example of the cutting part CT when the cutter unit CU is not attached to the attachment part AT. However, in FIG. 21, the cover part CV is omitted to clearly show the position of the interference part IF2. As shown in FIG. 21, in this case, the protrusion part TR2 is located on the biasing direction A2 side of the position of the protrusion part TR2 shown in FIG. 21. Therefore, as shown in FIG. 22, the protrusion part TR2 interferes with the cover part CV when the cover part CV moves from the open state to the closed state. FIG. 22 is a perspective view showing an example of the protrusion part TR2 interfering with the cover part CV during the movement of the cover part CV from the open state to the closed state. In the example shown in FIG. 22, the interference part IF2 is located in an obstructing position. In this case, the protrusion part TR2 interferes with the cover part CV during the movement of the cover part CV from the open state to the closed state. As a result, as shown in FIG. 22, the cover part CV cannot move from the open state to the closed state. The protrusion part TR2 is an example of a second protrusion. The contact member CN2 is an example of a second contact member, and the biasing member SP2 is an example of a second biasing member.

[0085] In a printing device 1 equipped with a cutting unit CT having a mounting unit ST2 configured as described above, the interference unit IF2 is positioned in the non-obstructing position when the cutter unit CU is attached to the mounting unit AT, and is positioned in the obstructing position when the cutter unit CU is not attached to the mounting unit AT. This prevents the cover unit CV from shifting from the open state to the closed state when the cutter unit CU is not attached to the mounting unit AT, visually informing the user that the cutter unit CU is not attached to the mounting unit AT. Note that a case in which the cutter unit CU is not attached may occur, for example, when the user forgets to attach the cutter unit CU. Therefore, the printing device 1 can be prevented from operating without the cutter unit CU attached to the mounting unit AT. This is useful because it helps prevent malfunctions in the printing device 1 before the printing device 1 begins operating. Furthermore, the printing device 1 can be prevented from operating without the cutter unit CU properly attached. Furthermore, the printing device 1 restricts the movement of the moving part CR of the cover part CV when it is not in the closed state, so that malfunctions can be prevented even if the user does not notice that the cutter unit CU is not attached to the attachment part AT.

[0086] In the first modification of the embodiment, the cover part CV may have an opening through which the protrusion part TR2 is inserted in the closed state. In this case, when the interference part IF2 is located in the non-obstruction position, the protrusion part TR2 is inserted into the opening, and when the interference part IF2 is not located in the non-obstruction position, the protrusion part TR2 is not inserted into the opening and interferes with the cover part CV.

[0087] <Modification 2 of the embodiment> A second modification of the embodiment will be described below with reference to Figures 23 to 28. In the second modification of the embodiment, the cutting unit CT has a mounting part ST3 instead of the mounting part ST1. Figure 23 is a perspective view showing yet another example of the state of the cutting unit CT when the cutter unit CU is replaced.

[0088] As shown in FIG. 23, the mounting portion ST2 has an attachment portion AT, a cover portion CV, and an interference portion IF3.

[0089] Like the interference part IF3, the interference part IF3 is a member that can move between an obstructing position where it interferes with the cover part CV and obstructs displacement of the cover part CV from the open state to the closed state, and a non-obstructing position where it does not interfere with the cover part CV and does not obstruct displacement of the cover part CV from the open state to the closed state. Here, the interference part IF3 is pushed by the cutter unit CU and moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This allows the cover part CV to move from the open state to the closed state without interfering with the interference part IF3. Meanwhile, during the process of removing the cutter unit CU from the mounting part AT, the interference part IF3 moves from the non-obstructing position to the obstructing position due to a biasing member such as a spring. This means that when the cutter unit CU is not attached to the mounting part AT, the cover part CV interferes with the interference part IF3 and cannot move from the open state to the closed state.

[0090] Fig. 24 is a top view showing yet another example of the cutting part CT when the cutter unit CU is attached to the attachment part AT, in which the cover part CV is omitted to clearly show the positional relationship between the cutter unit CU and the interference part IF3.

[0091] 24, the interference part IF3 has, for example, a contact member CN3 and a biasing member SP3. Note that the interference part IF3 may be configured to include other members in addition to the contact member CN3 and the biasing member SP3.

[0092] The contact member CN3 is a member that can come into contact with the cutter unit CU. In the example shown in FIG. 24, the contact member CN3 is a member that is biased by a biasing member SP3 toward the space in the mounting part AT where the cutter unit CU is placed. That is, the biasing member SP3 is a member that biases the contact member CN3 toward the space in the mounting part AT where the cutter unit CU is placed, such as, but not limited to, a spring. In the printing device 1, by having the biasing member SP3 in the interference part IF3, interference between the interference part IF3 and the cover part CV when the cutter unit CU is not attached to the mounting part AT can be achieved with a simple configuration. Furthermore, the contact member CN3 is a member having a plate-shaped portion parallel to the mounting surface of the mounting part AT. Here, the cutter unit CU is attached to the mounting part AT in the mounting direction, as described above. The contact member CN3 is inclined so that it extends toward the biasing direction A3 in which the biasing member SP3 biases the contact member CN3 as it approaches the mounting direction. Therefore, when the user slides the cutter unit CU on the mounting surface in the installation direction, the interference part IF3 is pushed by the cutter unit CU and moves in the direction opposite to the biasing direction A3. As a result, the interference part IF3 moves from the obstructing position to the non-obstructing position during the process of attaching the cutter unit CU to the mounting part AT. This is useful because it makes it easier for the user to notice that the cutter unit CU is not properly attached to the mounting part AT without reducing the ease of attachment of the cutter unit CU. The position of the interference part IF3 shown in Figure 24 is an example of the non-obstructing position.

[0093] Furthermore, unlike the contact member CN1, the contact member CN3 does not have an opening. Instead, in the second modified embodiment, the cutter unit CU has an opening H3. The opening H3 is an opening through which a protrusion TR3 of the cover part CV is inserted. Here, the protrusion TR3 is a portion of the cover part CV that protrudes toward the mounting surface when the cover part CV is in the closed state. The length of the protrusion TR3 is, for example, a length that contacts the mounting surface when the cover part CV is in the closed state and is spaced apart from the mounting surface when the cover part CV is not in the closed state, but is not limited to this.

[0094] In the second modification of the embodiment, the non-obstruction position is a position where the protrusion TR3 is inserted into the opening H3 when the cover part CV is displaced from the open state to the closed state. Therefore, when the cutter unit CU is attached to the attachment part AT, i.e., when the contact member CN3 is positioned at the non-obstruction position, the protrusion TR3 is inserted into the opening H3. As a result, in this case, the cover part CV can be displaced from the open state to the closed state. FIG. 25 is a top view showing an example of the state of the cutting part CT when the protrusion TR3 is inserted into the opening H3 and the cover part CV is in the closed state. FIG. 26 is a side cross-sectional view of the cutting part CT shown in FIG. 25. The position of the interference part IF3 shown in FIGS. 25 and 26 is an example of the non-obstruction position. As shown in FIGS. 25 and 26, when the interference part IF3 is positioned at the non-obstruction position, the cutter unit CU is attached to the attachment part AT. Therefore, the protrusion TR3 of the cover part CV is inserted into the opening H3 of the cover part CV when the cover part CV is displaced from the open state to the closed state as shown in Fig. 26. Therefore, the cover part CV can be displaced from the open state to the closed state as shown in Figs. 25 and 26.

[0095] On the other hand, in Modification 2 of the embodiment, the obstructing position is a position where the contact member CN3 contacts the protrusion TR3 when the cover part CV is displaced from the open state to the closed state. More specifically, in Modification 2 of the embodiment, the obstructing position is a position where the contact member CN3 overlaps with the space where the protrusion TR3 of the cover part CV exists in the closed state, as shown in FIG. 27 . FIG. 27 is a top view showing yet another example of the cutting part CT when the cutter unit CU is not attached to the attachment part AT. Therefore, when the cutter unit CU is not attached to the attachment part AT, i.e., when the contact member CN3 is not positioned in the non-obstructing position, the protrusion TR3 is not inserted into the opening H3 and interferes with the upper surface of the contact member CN3, as shown in FIG. 28 . As a result, in this case, the cover part CV cannot be displaced from the open state to the closed state. FIG. 28 is a side cross-sectional view showing an example of the protrusion TR3 interfering with the contact member CN3 during the displacement of the cover part CV from the open state to the closed state. The opening H3 is an example of a second opening. The protrusion TR3 is an example of a third protrusion, the contact member CN3 is an example of a third contact member, and the biasing member SP3 is an example of a third biasing member.

[0096] In a printing device 1 equipped with a cutting unit CT having a mounting portion ST3 configured as described above, the interference portion IF3 is positioned in the non-obstructing position when the cutter unit CU is attached to the mounting portion AT, and in the obstructing position when the cutter unit CU is not attached to the mounting portion AT. This prevents the cover portion CV from shifting from the open state to the closed state when the cutter unit CU is not attached to the mounting portion AT, visually informing the user that the cutter unit CU is not attached to the mounting portion AT. An example of a situation in which the cutter unit CU is not attached is when the user forgets to attach the cutter unit CU. This prevents the printing device 1 from operating without the cutter unit CU attached to the mounting portion AT. This is useful because it helps prevent malfunctions in the printing device 1 before the printing device 1 begins operating. Furthermore, the protrusion TR3 is inserted into the opening H3 of the cutter unit CU, making it easy for the user to position the cutter unit CU. This is useful because it helps prevent a decrease in the accuracy of cutting the roll paper RP by the printing device 1 due to a decrease in the installation accuracy of the cutter unit CU to the mounting part AT, such as when the cutter unit CU is not installed in a predetermined position on the mounting surface of the mounting part AT. Furthermore, the printing device 1 can alert the user that the cutter unit CU is not properly installed in the mounting part AT before operating the printing device 1. This prevents the total time required to print an image on the print medium from increasing compared to when the user realizes that the cutter unit CU is not properly installed in the mounting part AT after operating the printing device 1. Furthermore, because the printing device 1 restricts the movement of the cover part CV by the moving part CR when the cover part CV is not in the closed position, it can prevent malfunctions even if the user does not realize that the cutter unit CU is not installed in the mounting part AT.

[0097] The printing device 1 described above may be configured so that the cover part CV, which is open when in the replacement position, engages with the housing of the printing device 1, and the cutting part CT cannot be moved to the home position unless the cover part CV is displaced from the open state to the closed state. In this case, even if the cutter unit CU is not properly attached to the mounting part AT, there is no need to cause interference between the cover part CV and the regulating member SLD, and malfunctions caused by interference between the cover part CV and the regulating member SLD can be prevented. Furthermore, in this case, the printing device 1 can visually notify the user that the cutter unit CU is not properly attached to the mounting part AT, so there is no need to provide a notification part that notifies the user that the cutter unit CU is not properly attached to the mounting part AT.

[0098] Furthermore, the printing device 1 described above may be configured so that the cover part CV, which is not in the closed state in the replacement position, interferes with the opening-closing cover BD, and the opening-closing cover BD cannot close the rear opening unless the cover part CV is displaced from the open state to the closed state. Even in this case, even if the cutter unit CU is not properly attached to the mounting part AT, there is no need to cause interference between the cover part CV and the regulating member SLD, and malfunctions caused by interference between the cover part CV and the regulating member SLD can be prevented. Also in this case, the printing device 1 can visually notify the user that the cutter unit CU is not properly attached to the mounting part AT, so there is no need to provide a notification part that notifies the user that the cutter unit CU is not properly attached to the mounting part AT.

[0099] Furthermore, the items described above may be combined in any manner.

[0100] <Additional Notes> [1] a cutting unit that cuts the medium being transported by the transport unit; and a moving unit that moves the cutting unit back and forth in a moving direction that intersects the transport direction in which the medium is transported, wherein the cutting unit has a cutter unit having a cutter, and a mounting unit to which the cutter unit can be attached and detached, and the mounting unit has an attachment unit to which the cutter unit is attached, a cover unit that can be displaced between a closed state that covers the attachment unit and an open state that does not cover the attachment unit, and an interference unit that can move between an obstructing position that interferes with the cover unit to obstruct displacement of the cover unit from the open state to the closed state, and a non-obstructing position that does not interfere with the cover unit and does not obstruct displacement of the cover unit from the open state to the closed state, wherein the interference part is located in the non-obstructing position when the cutter unit is attached to the attachment unit, and is located in the obstructing position when the cutter unit is not attached to the attachment unit. [2] The medium conveying device described in [1], wherein the interference portion has a first opening, the cover portion has a first protrusion portion, the non-obstruction position is a position where the first protrusion portion is inserted into the first opening when the cover portion is displaced from the open state to the closed state, and the obstruction position is a position where the first protrusion portion is not inserted into the first opening when the cover portion is displaced from the open state to the closed state. [3] The medium conveying device described in [1], wherein the interference portion has a second protrusion portion, the non-obstruction position is a position where the second protrusion portion does not interfere with the cover portion when the cover portion is displaced from the open state to the closed state, and the obstruction position is a position where the second protrusion portion interferes with the cover portion when the cover portion is displaced from the open state to the closed state. [4] The cutter unit has a second opening, the cover portion has a third protrusion portion that is inserted into the second opening when the cover portion is displaced from the open state to the closed state, the non-obstructing position is a position where the interference portion does not block the second opening, and the obstructing position is a position where the interference portion blocks the second opening. [1] A medium transport device as described in. [5] The medium transport device described in [2], wherein the interference portion has the first opening, a first contact member capable of contacting the cutter unit, and a first biasing member that biases the first contact member toward the space in the mounting portion in which the cutter unit is placed. [6] The interference portion is provided with the second protrusion portion, and has a second contact member that can contact the cutter unit, and a second biasing member that biases the second contact member toward the space in the mounting portion in which the cutter unit is placed.The medium conveying device described in [3]. [7] The interference portion has a third contact member that can contact the cutter unit, and a third biasing member that biases the third contact member toward the space in the mounting portion in which the cutter unit is placed, and the third contact member does not block the second opening in the non-obstructing position, and blocks the second opening in the obstructing position. [4] A medium transport device as described in. [8] The cutter unit is attached to the mounting portion in a predetermined mounting direction, and the first contact member is inclined so that the more it moves toward the mounting direction, the more it extends toward a first biasing direction in which the first biasing member biases the first contact member. [5] A media transport device as described in. [9] The cutter unit is attached to the mounting portion in a predetermined mounting direction, and the second contact member is inclined so that the more it moves toward the mounting direction, the more it extends toward a second biasing direction in which the second biasing member biases the second contact member. [6] A media transport device as described in

[10] The cutter unit is attached to the mounting portion in a predetermined mounting direction, and the third contact member is inclined so that the closer it is to the mounting direction, the more it extends toward a third biasing direction in which the third biasing member biases the third contact member. [7] A media transport device as described in.

[11] A medium transport device described in any one of [1] to

[10] , comprising a regulating member that regulates the movement of the cover part by the moving part when the cover part is not in the closed state, and does not regulate the movement of the cover part by the moving part when the cover part is in the closed state, and the regulating member is provided above the movement path of the cutting part.

[12] The cover portion has a contactable portion extending upward, and when the cover portion is in the open state, the contactable portion comes into contact with the regulating member when the cutting portion is moved by the moving portion.

[11] A medium conveying device as described in.

[13] The medium transport device described in

[11] or

[12] , wherein the cover portion can be displaced from the closed state to the open state when the cover portion moves from a predetermined home position where the cutting portion starts cutting the medium to a predetermined replacement position where the cutter unit is replaced, and at least a portion of the regulating member is arranged to cover the area above the home position as well as the area above between the home position and the replacement position.

[14] The medium transport device described in

[13] is provided with a control unit that moves the cutting unit to the replacement position when an operation to instruct replacement of the cutter unit is received.

[15] A medium transport device described in any one of [1] to

[14] , comprising a housing, an operation unit that accepts operations, and an opening / closing cover that can be opened and closed between an open position that exposes the cutting unit and a closed position that does not expose the cutting unit, wherein the operation unit is provided on the front side of the housing, and the opening / closing cover is provided on the rear side of the housing.

[16] A medium transport device described in any one of [1] to

[15] , which is equipped with a dummy cutter unit that is detachable from the mounting portion and does not have a cutter, and the cover portion is displaceable from the open state to the closed state when the dummy cutter unit is attached to the mounting portion instead of the cutter unit, and cannot be displaced from the open state to the closed state when neither the cutter unit nor the dummy cutter unit is attached to the mounting portion.

[17] The medium transport device according to

[16] , further comprising a storage section for storing the dummy cutter unit.

[18]

[17] A medium transport device according to

[17] , comprising a housing and an operation unit that accepts operations, the operation unit being provided on a front surface of the housing, and the storage unit being provided on the front surface.

[19]

[17] A medium transport device as described in

[17] , comprising a housing and an opening / closing cover that can be opened and closed between an open position that exposes the cutting portion and a closed position that does not expose the cutting portion, wherein the opening / closing cover is provided on the rear surface of the housing, and the storage portion is provided at a position on the rear surface that is covered by the opening / closing cover when positioned in the closed position, and is not covered by the opening / closing cover when positioned in the open position.

[20] A medium transport device described in any one of

[17] to

[19] , which is provided with a detection unit that detects whether the cutter unit or the dummy cutter unit is attached to the attachment unit. [twenty one] A medium transport device according to any one of

[17] to

[20] , comprising a paper feed tray capable of accommodating cut paper and roll paper as the medium. [twenty two] A printing device comprising: a medium transport device according to any one of [1] to

[21] ; and a printing unit that prints an image on the medium transported by the transport unit.

[0101] The embodiments of this disclosure have been described in detail above with reference to the drawings, but the specific configuration is not limited to this embodiment, and may be changed, substituted, deleted, etc. as long as it does not deviate from the gist of this disclosure.

[0102] Furthermore, a program for implementing the functions of any of the components of the device described above may be recorded on a computer-readable recording medium and then loaded into a computer system for execution. Here, the device in question may be, for example, a printing device 1. Note that the term "computer system" here includes hardware such as an operating system (OS) and peripheral devices. Furthermore, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and compact disks (CDs)-ROMs, as well as storage devices such as hard disks built into computer systems. Furthermore, the term "computer-readable recording medium" also includes devices that retain a program for a certain period of time, such as volatile memory within a computer system that acts as a server or client when the program is transmitted via a network such as the Internet or a communication line such as a telephone line.

[0103] The above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by transmission waves in the transmission medium. Here, the "transmission medium" that transmits the program refers to a medium that has the function of transmitting information, such as a network such as the Internet or a communication line such as a telephone line. The program may also be a program for realizing some of the functions described above, or may be a so-called differential file or differential program that can realize the functions described above in combination with a program already recorded in the computer system. [Explanation of symbols]

[0104] 1...printing device, 10...member, 10A...rolled body support portion, 10B...cut paper support portion, 11...control portion, 12...storage portion, 13...communication portion, AT...mounting portion, AX1...rotating shaft, BD...opening / closing cover, BL1...movable blade, BL2...fixed blade, BX...housing, C1...carriage, C2...print head, C3...platen, CA...conveying portion, CM...storage portion, CN1, CN2, CN3...contact member, CP...cut paper, CR...moving portion, CT...cutting portion, CT1...first storage portion, CT2...second storage portion, CU...cutter unit, CV...cover portion, DCU...dummy cutter unit, EC...encoder, H1, H3, HL...opening, HL1...first opening, HL2...second opening, IF1, IF2, IF3...interference part, LV1...first lever, LV2...second lever, MT...motor, PNL...operation part, PP...roll paper passage, PR...printing part, PT1...first protrusion, PT2...second protrusion, R1...paper feed roller, RB...winding body, RP...roll paper, SL...scale, SLD...regulating member, SP...space, SP1, SP2, SP3...urging member, ST1, ST2, ST3...mounting part, TB...timing belt, TC...three-dimensional coordinate system, TR...paper feed tray, TR1, TR2, TR3...protrusion

Claims

1. a transport unit that transports the medium; a cutting unit that cuts the medium transported by the transport unit; a moving unit that reciprocates the cutting unit in a moving direction that intersects with a conveying direction in which the medium is conveyed; Equipped with The cutting portion is a cutter unit having a cutter; a mounting portion to which the cutter unit can be detachably attached; and The mounting portion is a mounting portion to which the cutter unit is attached; a cover portion that is displaceable between a closed state that covers the mounting portion and an open state that does not cover the mounting portion; an interference portion that is movable between an obstructing position that interferes with the cover portion to obstruct displacement of the cover portion from the open state to the closed state and a non-obstructing position that does not interfere with the cover portion and does not obstruct displacement of the cover portion from the open state to the closed state; and The interference portion is When the cutter unit is attached to the attachment portion, it is located in the non-obstructing position, When the cutter unit is not attached to the attachment portion, it is in the obstructing position. Media transport device.

2. the interference portion has a first opening, the cover portion has a first protrusion portion, the non-obstructing position is a position where the first protrusion is inserted into the first opening when the cover portion is displaced from the open state to the closed state, the obstruction position is a position where the first protrusion is not inserted into the first opening when the cover portion is displaced from the open state to the closed state; The media transport device of claim 1 .

3. the interference portion has a second protrusion, the non-obstruction position is a position where the second protrusion does not interfere with the cover portion when the cover portion moves from the open state to the closed state, the obstruction position is a position where the second protrusion interferes with the cover portion when the cover portion is displaced from the open state to the closed state. The media transport device of claim 1 .

4. the cutter unit has a second opening; the cover portion has a third protrusion portion that is inserted into the second opening when the cover portion moves from the open state to the closed state, the non-obstruction position is a position where the interference portion does not block the second opening, The obstructing position is a position where the interference portion blocks the second opening. The media transport device of claim 1 .

5. The interference portion is a first contact member having the first opening and capable of contacting the cutter unit; a first biasing member that biases the first contact member toward a space in the mounting portion where the cutter unit is placed; having The medium transport device of claim 2 .

6. The interference portion is a second contact member provided with the second protrusion and capable of contacting the cutter unit; a second biasing member that biases the second contact member toward a space in the mounting portion where the cutter unit is placed; having The medium transport device of claim 3 .

7. The interference portion is a third contact member capable of coming into contact with the cutter unit; a third biasing member that biases the third contact member toward a space in the mounting portion where the cutter unit is placed; and The third contact member is The second opening is not blocked in the unobstructed position; blocking the second opening in the blocking position; The medium transport device of claim 4 .

8. The cutter unit is attached to the attachment portion in a predetermined attachment direction, The first contact member is inclined so as to extend more toward the mounting direction toward a first biasing direction in which the first biasing member biases the first contact member. The medium transport device of claim 5 .

9. The cutter unit is attached to the attachment portion in a predetermined attachment direction, The second contact member is inclined so as to extend toward the second biasing direction in which the second biasing member biases the second contact member as it approaches the mounting direction. The medium transport device of claim 6 .

10. The cutter unit is attached to the attachment portion in a predetermined attachment direction, The third contact member is inclined so as to extend toward the third biasing direction in which the third biasing member biases the third contact member as it approaches the mounting direction. The medium transport device of claim 7 .

11. a restricting member that restricts movement of the cover portion by the movable portion when the cover portion is not in the closed state, and does not restrict movement of the cover portion by the movable portion when the cover portion is in the closed state; The regulating member is provided above the movement path of the cutting unit. The media transport device of claim 1 .

12. The cover portion has a contacted portion extending upward, When the cover is in the open state, the contacted portion comes into contact with the regulating member when the cutting portion is moved by the moving portion. The media transport device of claim 11 .

13. the cover portion can be displaced from the closed state to the open state when the cover portion moves from a predetermined home position, where the cutting portion starts the operation of cutting the medium, to a predetermined replacement position, where the cutter unit is replaced; At least a part of the regulating member is provided so as to cover an area above the home position and an area above a region between the home position and the exchange position. The media transport device of claim 11 .

14. a control unit that moves the cutting unit to the replacement position when an operation to issue a replacement instruction for the cutter unit is received; The media transport device of claim 13 .

15. The housing and an operation unit that accepts operations; an opening / closing cover that can be opened and closed between an open position that exposes the cutting portion and a closed position that does not expose the cutting portion; Equipped with the operation unit is provided on the front surface of the housing, The opening / closing cover is provided on the rear surface of the housing. The media transport device of claim 1 .

16. a dummy cutter unit that is detachable from the mounting portion and does not have a cutter; The cover portion is When the dummy cutter unit is attached to the attachment portion instead of the cutter unit, the dummy cutter unit is displaceable from the open state to the closed state, When neither the cutter unit nor the dummy cutter unit is attached to the attachment portion, the cutter unit cannot be displaced from the open state to the closed state. The media transport device of claim 1 .

17. A storage unit for storing the dummy cutter unit is provided. The media transport device of claim 16.

18. The housing and an operation unit that accepts operations; Equipped with the operation unit is provided on the front surface of the housing, The storage section is provided on the front surface. The media transport device of claim 17.

19. The housing and an opening / closing cover that can be opened and closed between an open position that exposes the cutting portion and a closed position that does not expose the cutting portion; Equipped with the opening / closing cover is provided on the rear surface of the housing, the storage section is provided at a position on the rear surface that is covered by the opening / closing cover when the opening / closing cover is in the closed position, and at a position on the rear surface that is not covered by the opening / closing cover when the opening / closing cover is in the open position. The media transport device of claim 17.

20. a detection unit that detects whether the cutter unit or the dummy cutter unit is attached to the attachment unit; The media transport device of claim 17.

21. a paper feed tray capable of accommodating cut paper and roll paper as the medium; The media transport device of claim 17.

22. The medium transport device according to claim 1 ; a printing unit that prints an image on the medium transported by the transport unit; A printing device comprising:

Images