Printing apparatus and

Abstract

The present disclosure provides a printing apparatus capable of bringing a platen roller and a print head into uniform contact with each other in a width direction of a recording sheet in a case where an opening / closing portion is coupled to a main body portion so as to be pivotable about a pivot shaft orthogonal to the width direction of the recording sheet and is configured to be openable and closable.SOLUTION: The head unit 41 has a protruding portion 41p that protrudes rearward in the transport direction (X-axis direction) of the recording paper between the center portion and both end portions in the longitudinal direction along the widthwise direction (Y-axis direction) of the recording paper. The head frame 23 has a notched part 41p for housing the projecting part 23c, a movement regulating part MR abutting on a part of the head unit 41 from both sides in the longitudinal direction, and an energizing member 23p for energizing the head unit 41 toward the platen unit. Between the cutout 23c and the projection 41p, there is a gap that allows the head unit 41 to swing around a shaft Ax parallel to the rotation shaft (X-axis direction) of the opening / closing unit and around a shaft parallel to the widthwise direction of the recording paper.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to printing devices. [Background technology]

[0002] Conventionally, thermal printers that print information on thermal paper using a thermal printhead are known (see, for example, Patent Document 1 below). The thermal printer described in Patent Document 1 has a lid that rotates from above to the rear around the rear end of the main body as the rotation center to open. The lid opens and closes by rotating around a rotation axis that is parallel to the width direction of the thermal paper wound in a roll and stored in the paper storage section of the main body.

[0003] In the thermal printer described in Patent Document 1, the rear portion of the thermal print head unit is hooked and supported at only one point, approximately in the center of the width of the thermal paper, allowing the thermal print head unit to freely swing up and down across the width of the thermal paper, centered on the supported rear portion.

[0004] With this configuration, even if the platen roller, with which the heating element array of the thermal print head unit comes into contact, wears to a truncated cone shape due to uneven wear across the width of the thermal paper, the thermal print head unit tilts across the width, absorbing the uneven wear across the width of the thermal paper and ensuring substantially uniform contact between the heating element array and the platen roller across the width.

[0005] There is also known a label printer that is configured to be able to switch between continuous printing and peel-off printing (see, for example, Patent Document 2 below). In the printer described in Patent Document 2, the internal functional components are protected by a main body case and a printer cover. Opening the printer cover exposes the roll paper storage chamber. The roll paper storage chamber is a space that stores roll paper. The printer cover is configured to be able to open and close by rotating about a hinge axis that is parallel to the width direction of the roll paper between an open position that exposes the interior of the printer and a closed position that closes the interior of the printer.

[0006] The printer described in Patent Document 2 has a notch formed at the substantial center of the longitudinal direction (width direction of the roll paper) of the surface of the thermal head. Furthermore, a convex portion is formed on the wall of the internal frame behind the thermal head that faces the rear surface of the thermal head. The convex portion abuts against the thermal head at the notch. This configuration allows the thermal head to swing clockwise and counterclockwise around the convex portion as a fulcrum in a plan view. Furthermore, the thermal head is also swingable clockwise and counterclockwise around the convex portion as a fulcrum in a side view looking across the width of the thermal paper. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-161815 [Patent Document 2] Japanese Patent Publication No. 2022-080490 Summary of the Invention [Problem to be solved by the invention]

[0008] Unlike the aforementioned Patent Documents 1 and 2, in a printing device that prints on recording paper between a main body and an opening / closing part provided on it, the opening / closing part may be connected to the main body so as to be rotatable around a pivot axis perpendicular to the width direction of the recording paper, and configured to be openable and closable relative to the main body.

[0009] In this case, when the opening / closing unit is gradually closed from its fully open state relative to the main body, the head unit that prints on the recording paper and the platen unit that transports the recording paper begin to come into contact at the edge of the recording paper in the width direction that is closest to the pivot axis of the opening / closing unit. Then, as the opening / closing unit is further closed relative to the main body, the area of ​​contact between the head unit and the platen unit expands toward the edge in the width direction of the recording paper that is farther from the pivot axis. This poses the problem of making it difficult to achieve uniform contact between the platen unit and the head unit in the width direction of the recording paper.

[0010] Patent Documents 1 and 2 disclose a configuration in which the thermal head unit or thermal head can swing relative to the platen roller. However, the lid and printer cover open and close relative to the main body and main body case by rotating around a rotation axis parallel to the width direction of the thermal paper and roll paper, respectively. Therefore, if the lid and printer cover are configured to be rotatable around a rotation axis perpendicular to the width direction of the thermal paper and roll paper, respectively, there is a risk that the thermal head unit and thermal head will not contact the platen roller uniformly across the width of the thermal paper and roll paper.

[0011] The present disclosure provides a printing device that can bring the head unit and platen unit into uniform contact in the width direction of the recording paper when the opening / closing section is rotatably connected to the main body section around a pivot axis perpendicular to the width direction of the recording paper and is configured to be openable and closable. [Means for solving the problem]

[0012] One aspect of the present disclosure provides a printing device comprising: a head unit that prints on recording paper; a platen unit that transports the recording paper; a main body that supports the head unit or the platen unit; an opening / closing unit that is rotatably connected to the main body about a rotation axis perpendicular to the width direction of the recording paper and supports the platen unit or the head unit that is not supported by the main body; and a head frame that is provided on the main body or the opening / closing unit that supports the head unit, wherein the head unit has protrusions that protrude rearward in the transport direction of the recording paper between a center portion and both ends in a longitudinal direction along the width direction of the recording paper, the head frame has notches that accommodate the protrusions, movement restricting portions that abut against parts of the head unit from both sides in the longitudinal direction, and a biasing member that biases the head unit toward the platen unit, and the notches have a gap between them that allows the head unit to oscillate around an axis parallel to the rotation axis and an axis parallel to the width direction of the recording paper.

[0013] Another aspect of the present disclosure is a printer including a head unit that prints on recording paper, a platen unit that transports the recording paper, a main body that supports the head unit or the platen unit, an opening / closing unit that is rotatably connected to the main body about a rotation axis that is perpendicular to the width direction of the recording paper and that supports the platen unit or the head unit that is not supported by the main body, and a head frame that is provided on the main body or the opening / closing unit that supports the head unit, and the head unit is disposed between a center portion and both ends in a longitudinal direction along the width direction of the recording paper, A printing device is provided which has a protrusion that protrudes rearward in the transport direction of the recording paper, the head frame having a notch that accommodates the protrusion and a biasing member that biases the head unit toward the platen unit, the notch having a gap between it and the protrusion that allows the head unit to swing around an axis parallel to the pivot axis and an axis parallel to the width direction of the recording paper, and the head unit abuts against the protrusion while supported parallel to the width direction of the recording paper, thereby regulating movement of the head unit in the width direction of the recording paper.

[0014] Yet another aspect of the present disclosure is a printing apparatus including a head unit that prints on recording paper, a platen unit that transports the recording paper, a main body that supports the head unit or the platen unit, an opening / closing unit that is rotatably connected to the main body about a rotation axis that is perpendicular to the width direction of the recording paper and that supports the platen unit or the head unit that is not supported by the main body, and a head frame that is provided on the main body or the opening / closing unit that supports the head unit, wherein the head unit is oriented in a longitudinal direction along the width direction of the recording paper. A printing device is provided which has protrusions between a center portion and both ends that protrude rearward in the transport direction of the recording paper, and convex portions provided at both ends in the longitudinal direction, the head frame having cutout portions that accommodate the protrusions, side wall portions that abut the convex portions from both sides in the longitudinal direction, and a biasing member that biases the head unit toward the platen unit, and the cutout portions have a gap between them that allows the head unit to oscillate around an axis parallel to the rotation axis and an axis parallel to the width direction of the recording paper. [Effects of the Invention]

[0015] According to each of the above aspects of the present disclosure, when the opening / closing section is rotatably connected to the main body section around a pivot axis perpendicular to the width direction of the recording paper and configured to be openable and closable, a printing device can be provided that can bring the platen unit and the head unit into uniform contact in the width direction of the recording paper. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a printing apparatus according to a first embodiment. [Figure 2] Perspective view of the main body and opening / closing section [Figure 3] Perspective view of the main body and opening / closing section [Figure 4] Perspective view of the main body and opening / closing section [Figure 5] Front view of the main body and opening / closing section [Figure 6] Cross-section of the main body and opening / closing section [Figure 7]Front view of the main body and opening / closing section [Figure 8] Rear view of the head unit and head frame [Figure 9] Enlarged view of the protrusion and notch [Figure 10] Cross-section of the head unit and head frame [Figure 11] Rear view of the head unit and head frame [Figure 12] Rear view of the head unit and head frame [Figure 13] Enlarged view of the protrusion and notch of the printing device in the second embodiment. [Figure 14] Top view of the head unit and head frame [Figure 15] Enlarged view of the protrusion and side wall [Figure 16] Enlarged view of the protrusion and notch of the printing device in the third embodiment. [Figure 17] Enlarged view of the protrusion and notch of the printing device in the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the invention will be described with reference to the drawings.

[0018] [Embodiment 1] Fig. 1 is a perspective view showing a first embodiment of a printing device according to the present disclosure. Figs. 2 and 3 are perspective views of a main body 2 and an opening / closing unit 3 of the printing device 1 shown in Fig. 1. Each figure shows a three-dimensional Cartesian coordinate system having an X axis parallel to the conveyance direction Df of the recording paper P, a Y axis parallel to the width direction of the recording paper P, and a Z axis parallel to the cutting direction Dc of the recording paper P.

[0019] The printing device 1 of this embodiment is, for example, a thermal printer equipped with a thermal printhead 41h, and is used in a multimedia station (MMS), an automated teller machine (ATM), a cash dispenser (CD), a ticket machine, or a cash register installed in a convenience store. The printing device 1 conveys recording paper P, which is, for example, thermal paper, prints information such as letters and numbers on the recording paper P, and then cuts it to output pieces of recording paper such as tickets or receipts.

[0020] The printing device 1 includes, for example, a main body 2, an opening / closing unit 3, a printing unit 4, a cutting unit 5, a base unit 6, and a recording paper holder 7. The main body 2 is, for example, a main frame fixed to the base unit 6, and has the opening / closing unit 3, the printing unit 4, the cutting unit 5, etc. attached thereto.

[0021] The opening / closing unit 3 is, for example, an openable top portion located above the side of the main body 2 where the recording paper P is inserted. In Fig. 2, the opening / closing unit 3 provided on the main body 2 is in a fully closed state, and in Fig. 3, the opening / closing unit 3 is in a fully open state. The opening / closing unit 3 has, for example, a rectangular planar shape with its longitudinal direction being the width direction of the recording paper P, which is roll paper.

[0022] A rotation shaft 31 is provided at one longitudinal end of the opening / closing unit 3. The rotation shaft 31 is generally parallel to the conveyance direction Df (X-axis direction) of the recording paper P and generally perpendicular to the width direction (Y-axis direction) and cutting direction Dc (Z-axis direction) of the recording paper P. The opening / closing unit 3 is connected to the main body unit 2 via the rotation shaft 31, for example, inserted into a through-hole provided in the main body unit 2, and is configured to be able to open and close relative to the main body unit 2 by rotating around the rotation shaft 31.

[0023] An opening / closing lever 8 is provided on the end of the opening / closing unit 3 opposite the end connected to the main body 2. The opening / closing lever 8 is rotatably supported, for example, by a rotation shaft 32 provided on the opening / closing unit 3. The opening / closing lever 8 rotates between an open position where the opening / closing unit 3 can be opened and closed, and a locked position where the opening / closing unit 3 is fixed to the main body 2. The opening / closing lever 8 also functions as a handle when opening the opening / closing unit 3 from the closed state shown in FIGS. 1 and 2 to the opening / closing unit 3 shown in FIG. 3.

[0024] 3, the printing unit 4 includes a head unit 41 that prints on recording paper P, and a platen unit 42 that transports the recording paper P. In the example shown, the head unit 41 is attached to, for example, the main frame of the main body 2, and the platen unit 42 is attached to, for example, the opening / closing unit 3. That is, the main body 2 supports the head unit 41, and the opening / closing unit 3 supports the platen unit 42 that is not supported by the main body 2. The main body 2 is provided with a head frame 23 that supports the head unit 41.

[0025] Although not shown in the drawings, the arrangement of the head unit 41 and the platen unit 42 relative to the main body 2 and the opening / closing unit 3 can be reversed. That is, the head unit 41 may be attached to the opening / closing unit 3, and the platen unit 42 may be attached to the main body 2. In this case, the main body 2 supports the platen unit 42, and the opening / closing unit 3 supports the head unit 41 that is not supported by the main body 2. In this case, a head frame similar to the head frame 23 provided on the main body 2 is provided on the opening / closing unit 3 that supports the head unit 41.

[0026] The head unit 41 includes, for example, a thermal printhead 41h which is a print head, and the platen unit 42 includes a platen roller 42r which transports the recording paper P.

[0027] A transport drive system, including a motor and gears that rotate the platen roller 42r of the platen unit 42, is attached, for example, to the main body 2. In the printing device 1, for example, by closing the opening / closing unit 3, a gear provided on the platen roller 42r is connected to a gear of the transport drive system attached to the main body 2. In the printing unit 4, for example, the platen roller 42r transports the recording paper P inserted between the head unit 41 and the platen unit 42 in the transport direction Df, and the thermal printhead 41h prints on the recording paper P.

[0028] The cutting unit 5 includes, for example, a fixed blade 51 and a movable blade 52 that cut the recording paper P printed by the printing unit 4, and a cutter drive unit 53 that supports the movable blade 52 and moves it up and down. The cutter drive unit 53 is, for example, constantly connected to a motor and gears. The fixed blade 51 is, for example, as shown in FIG. 3 , arranged along the longitudinal direction of the rectangular opening / closing unit 3 and supported by the opening / closing unit 3. The fixed blade 51 has an elongated shape that extends in the width direction of the recording paper P. In other words, the longitudinal direction of the fixed blade 51 and the longitudinal direction of the opening / closing unit 3 coincide with each other.

[0029] The movable blade 52 is supported by the main body 2 by attaching the cutting unit 5 to the main body 2. The movable blade 52 is provided so as to be movable along a cutting direction Dc, which is an operating direction that is roughly perpendicular to the conveyance direction Df of the recording paper P, by a cutter drive unit 53. The cutter drive unit 53 includes, for example, a motor, gears, a link mechanism, etc. attached to the main body 2, and by driving the motor, moves the movable blade 52 back and forth in the cutting direction Dc and the opposite direction. The cutter drive unit 53 operates the movable blade 52, for example, between a standby position before cutting of the recording paper P begins and a completion position where cutting of the recording paper P is completed.

[0030] 1, the base unit 6 is a rectangular plate-shaped member that serves as a base for the printing device 1. The main body 2 and a recording paper holder 7 are arranged adjacent to each other on the base unit 6 and are fixed to the base unit 6. The recording paper holder 7 rotatably supports recording paper P, which may be, for example, roll paper, and continuously supplies the recording paper P between the head unit 41 and platen unit 42 of the printing unit 4.

[0031] In the printing device 1 of this embodiment, as the opening / closing unit 3 is gradually closed from an open state relative to the main body 2, the thermal print head 41h of the head unit 41 and the platen roller 42r of the platen unit 42 begin to come into contact at the end of the opening / closing unit 3 near the pivot shaft 31. After that, as the opening / closing unit 3 is further closed relative to the main body 2, the area of ​​contact between the thermal print head 41h and the platen roller 42r expands in the width direction of the recording paper P, which is the longitudinal direction of the head unit 41, towards the end farther from the pivot shaft 31 of the opening / closing unit 3.

[0032] In this way, if the contact between the head unit 41 and the platen unit 42 gradually expands in the longitudinal direction of the head unit 41, an uneven contact pressure between the platen unit 42 and the head unit 41 occurs, making it more likely that unevenness will occur in the print quality in the width direction of the recording paper P. Specifically, the contact pressure between the platen unit 42 and the head unit 41 tends to increase the closer it is to the rotation axis 31 of the opening / closing section 3. For this reason, the printing device 1 of this embodiment has a swing support mechanism for the head unit 41 that keeps the head unit 41 in uniform contact with the platen unit 42 when the opening / closing section 3 is rotated about the rotation axis 31 that is perpendicular to the width direction of the recording paper P to close the opening / closing section 3.

[0033] The swing support mechanism of the head unit 41, which is a characteristic feature of the printing device 1 of this embodiment, will be described in detail below with reference to Figures 4 to 12. Figures 4 to 7 are a perspective view, a front view, a cross-sectional view, and a front view of the main body unit 2 and the opening / closing unit 3, respectively. Note that Figure 6 is a cross-sectional view of the main body unit 2 and the opening / closing unit 3 taken along line VI-VI in Figure 5. Also, Figures 4 to 7 omit illustration of the cutting unit 5, as well as motors, gears, etc. that drive the printing unit 4 and the cutting unit 5.

[0034] Fig. 8 is a rear view of the head unit 41 and the head frame 23. Fig. 9 is an enlarged view of the protrusion 41p of the head unit 41 and the cutout portion 23c of the head frame 23. Fig. 10 is a cross-sectional view of the head unit 41 and the head frame 23 taken along line XX in Fig. 8. Figs. 11 and 12 are rear views of the head unit 41 and the head frame 23 showing the swing of the head unit 41 around the axis Ax parallel to the rotation axis 31 of the opening / closing unit 3.

[0035] In the printing device 1 of this embodiment, the swing support mechanism for the head unit 41 is made up of the head unit 41 and a head frame 23.

[0036] The head unit 41 includes a thermal printhead 41h that prints information such as letters and numbers on the recording paper P. The thermal printhead 41h includes, for example, a substrate 41s, a heat sink 41r, and a connector 41c, as shown in FIGS.

[0037] The substrate 41s includes, for example, a ceramic substrate and a circuit board, and has a heating resistor, an integrated circuit (IC), and the like mounted on its surface for printing on recording paper P, which is thermal paper. The heat sink 41r is a metal plate-shaped member, and is fixed to the back surface of the substrate 41s via double-sided tape or the like. The connector 41c is mounted on the substrate 41s at the center of the head unit 41 in the longitudinal direction (Y-axis direction), and is connected to the heating resistor, IC, and the like of the substrate 41s.

[0038] The head unit 41 has protrusions 41p that protrude rearward in the transport direction of the recording paper P (negative X-axis direction) between the center and both ends of the lengthwise direction along the width direction (Y-axis direction) of the recording paper P. In the example shown in Fig. 8, the head unit 41 has a pair of protrusions 41p, but the head unit 41 may have three or more protrusions 41p. The protrusions 41p are provided, for example, on a heat sink 41r of the thermal printhead 41h.

[0039] 6 to 8, the head unit 41 has guide protrusions 41g at both ends in the longitudinal direction (Y-axis direction). The guide protrusions 41g are provided at the front end of the head unit 41, opposite the rear end of the head unit 41 where the protrusions 41p are provided, in the transport direction Df of the recording paper P. In the example shown, the guide protrusions 41g are provided on the heat sink 41r.

[0040] 6 and 8, the head frame 23 has a bottom wall 23b, a side wall 23s, a front wall 23f, and a rear wall 23r. The head frame 23 also has a biasing member 23p that biases the head unit 41 toward the platen unit 42.

[0041] 4, the bottom wall 23b is provided on the upper part of the main body 2 and has a rectangular plate shape with the longitudinal direction being the width direction (Y-axis direction) of the recording paper P and the transverse direction being the transport direction Df (X-axis direction) of the recording paper P. As shown in FIGS. 6 and 10, the bottom wall 23b is inclined with respect to the transport direction Df of the recording paper P so as to approach the platen unit 42 from the rear to the front in the transport direction Df of the recording paper P.

[0042] The side walls 23s are provided so as to rise from both longitudinal ends of the bottom wall 23b toward the platen unit 42. For example, as shown in FIG. 6, an arc-shaped recess that supports the bearing 42b of the platen roller 42r is provided at the upper end of the side wall 23s. Furthermore, a guide groove 23g that is cut out toward the platen unit 42 is provided at the front end of the side wall 23s in the conveyance direction Df of the recording paper P. The guide groove 23g engages with a guide protrusion 41g of the head unit 41, and guides the swinging of the head unit 41 around an axis Ay that is parallel to the width direction (Y-axis direction) of the recording paper P, as shown by arrow A10 in FIG.

[0043] The front wall 23f is provided so as to rise from the front end of the bottom wall 23b in the transport direction Df of the recording paper P toward the platen unit 42. As shown in Fig. 7, the front wall 23f is cut out in steps from the top end toward the bottom wall 23b at multiple locations at equal intervals in the width direction of the recording paper P. Urging members 23p are respectively arranged on the rear side of the cut-out portions of the front wall 23f in the transport direction Df of the recording paper P.

[0044] The urging member 23p is, for example, a spring such as a coil spring, and is disposed between the front end of the heat sink 41r of the head unit 41 in the transport direction Df of the recording paper P and the bottom wall 23b of the head frame 23. The urging member 23p urges the front end of the head unit 41, which is opposite to the rear end of the head unit 41 where the protrusion 41p is provided, toward the platen unit 42.

[0045] The rear wall 23r is provided so as to rise from the rear end of the bottom wall 23b in the transport direction Df of the recording paper P toward the platen unit 42. As shown in Fig. 8, the rear wall 23r is provided at both ends of the head frame 23 in the longitudinal direction (Y-axis direction), which is the width direction of the recording paper P, and is spaced apart from the side walls 23s. In other words, the rear wall 23r opens the rear end of the head frame 23 in the transport direction Df of the recording paper P at the center of the longitudinal direction of the head frame 23. This causes the rear wall 23r to expose the connector 41c provided on the thermal printhead 41h of the head unit 41 toward the rear side in the transport direction Df of the recording paper P at the center of the longitudinal direction of the head frame 23.

[0046] Furthermore, rear wall 23r has a recessed cutout portion 23c cut out toward an end portion in the longitudinal direction of head frame 23, on a side portion closer to the center in the longitudinal direction of head frame 23. Cutout portion 23c accommodates protrusion portion 41p of head unit 41. As shown in FIG. 9, there is a gap between cutout portion 23c and protrusion portion 41p.

[0047] The gap between the notch 23c of the head frame 23 and the protrusion 41p of the head unit 41 allows the head unit 41 to swing about the axis Ax parallel to the rotation axis 31 (X-axis direction) of the opening / closing unit 3, as shown by arrows A11 and A12 in Figures 11 and 12. Furthermore, the gap between the notch 23c of the head frame 23 and the protrusion 41p of the head unit 41 guides the swing of the head unit 41 about the axis Ay parallel to the width direction (Y-axis direction) of the recording paper P, as shown by arrow A10 in Figure 10.

[0048] 8 and 9, the head frame 23 has a movement restricting portion MR that abuts against a part of the head unit 41 from both sides in the longitudinal direction (Y-axis direction) of the head unit 41. In the example shown in Fig. 8 and 9, the movement restricting portion MR is formed by a notched portion 23c of the head frame 23, and abuts against a protrusion 41p of the head unit 41 from both sides in the longitudinal direction of the head unit 41.

[0049] 8 and 9, for example, when the head unit 41 is substantially parallel to the width direction of the recording paper P, the movement restricting portions MR come into contact with the protrusions 41p from both longitudinal sides of the head unit 41, restricting longitudinal movement of the head unit 41. Note that the movement restricting portions MR may be provided in other parts of the head frame 23 and may come into contact with other parts of the head unit 41 from both longitudinal sides of the head unit 41.

[0050] As shown in FIG. 9, the cutout portion 23c of the head frame 23 includes, for example, a first wall 23c1, a second wall 23c2, and a third wall 23c3.

[0051] The first wall 23c1 is an inner wall of the cutout portion 23c on the platen unit 42 side, and is provided approximately parallel to the width direction of the recording paper P. The first wall 23c1 contacts the protrusion 41p of the head unit 41 in the first state in which the head unit 41 is urged toward the platen unit 42 by the urging member 23p and supported parallel to the width direction of the recording paper P.

[0052] The second wall 23c2 is an inner wall of the cutout portion 23c on the opposite side from the platen unit 42, and is provided approximately parallel to the width direction of the recording paper P. The second wall 23c2 is provided opposite the first wall 23c1, and in the first state shown in Figures 8 and 9, there is a gap between the second wall 23c2 and the protrusion 41p of the head unit 41.

[0053] The third wall 23c3 is the bottom wall of the cutout portion 23c, and is provided at an angle with respect to the cutting direction Dc (Z-axis direction) of the recording paper P. The third wall 23c3 is provided between the first wall 23c1 and the second wall 23c2, and has a gap between it and the protrusion 41p of the head unit 41. Furthermore, as shown in FIG. 9, the third wall 23c3 includes an inclined surface that is inclined so as to widen outward in the width direction of the recording paper P as it moves away from the platen unit 42 in the direction opposite to the biasing direction of the head unit 41 by the biasing member 23p.

[0054] Because the third wall 23c3 includes the above-mentioned inclined surface, a gap is formed between the third wall 23c3 and the protrusion 41p of the head unit 41. This gap prevents interference between the protrusion 41p and the third wall 23c3 and allows the head unit 41 to swing when the head unit 41 swings around the axis Ax parallel to the conveyance direction Df of the recording paper P as shown by arrows A11 and A12 in FIGS.

[0055] 9, an end of the third wall 23c3 adjacent to the first wall 23c1 forms a movement restricting portion MR that restricts longitudinal movement of the head unit 41 in the first state. That is, in this embodiment, the notch portion 23c abuts against the protrusion 41p when the head unit 41 is supported parallel to the width direction of the recording paper P, thereby restricting movement of the head unit 41 in the width direction of the recording paper P. Specifically, the movement restricting portion MR is provided between the first wall 23c1 and the third wall 23c3 of the notch portion 23c, and abuts against the protrusion 41p of the head unit 41 in the first state, thereby restricting movement in the width direction of the recording paper P.

[0056] The operation of the printing device 1 of this embodiment will be described below.

[0057] The printing device 1 of this embodiment includes a head unit 41 that prints on recording paper P, a platen unit 42 that transports the recording paper P, a main body 2, an opening / closing unit 3, and a head frame 23. The main body 2 supports the head unit 41. The opening / closing unit 3 is rotatably connected to the main body 2 about a rotation axis 31 that is perpendicular to the width direction of the recording paper P, and supports the platen unit 42 that is not supported by the main body 2. The head frame 23 is provided on the main body 2 that supports the head unit 41. Alternatively, the platen unit 42 may be supported by the main body 2, and the head unit 41 that is not supported by the main body 2 may be supported by the opening / closing unit 3, with the head frame 23 provided on the opening / closing unit 3 that supports the head unit 41. The head unit 41 has protrusions 41p that protrude rearward in the transport direction Df of the recording paper P between the center and both ends of the lengthwise direction along the width direction of the recording paper P. The head frame 23 has a notch 23c that accommodates the protrusion 41p, movement restricting members MR that abut against a part of the head unit 41 from both sides of the head unit 41 in the longitudinal direction, and a biasing member 23p that biases the head unit 41 toward the platen unit 42. The notch 23c has a gap between it and the protrusion 41p that allows the head unit 41 to swing around an axis Ax that is parallel to the rotation shaft 31 and an axis Ay that is parallel to the width direction of the recording paper P.

[0058] With this configuration, in the printing device 1 of this embodiment, as the opening / closing unit 3 is gradually closed from an open state relative to the main body 2, the head unit 41 and the platen unit 42 begin to come into contact with each other at the end portion near the rotation shaft 31 of the opening / closing unit 3. At this time, the head unit 41, which is urged toward the platen unit 42 by the urging member 23p, is restricted from moving in a direction away from the rotation shaft 31 by the left-side movement restricting member MR, which is spaced from the rotation shaft 31 of the opening / closing unit 3, as shown in FIG. 11 . Furthermore, as the end portion of the head unit 41 on the right side in FIG. 11 , which is close to the rotation shaft 31 of the opening / closing unit 3, comes into contact with the platen unit 42, the head unit 41 swings about the axis Ax, which is parallel to the conveyance direction Df of the recording paper P, with the left-side movement restricting member MR as a fulcrum, as shown by arrow A11. As a result, the protrusion 41p housed in the right-side cutout 23c near the rotation shaft 31 of the opening / closing unit 3, moves away from the platen unit 42, and the head unit 41 tilts in accordance with the platen unit 42. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in contact with each other uniformly across the width of the recording paper P.

[0059] 10, the head unit 41 swings around an axis Ay parallel to the width direction of the recording paper P, with the point of contact between the protrusion 41p and the notch 23c as a fulcrum. This allows the contact pressure between the head unit 41 and the platen unit 42 to be adjusted, allowing the head unit 41 and the platen unit 42 to come into more uniform contact with each other.

[0060] Furthermore, when the opening-closing unit 3 is completely closed relative to the main body 2, suppose that the end of the platen unit 42, which is separated from the rotation shaft 31 of the opening-closing unit 3, is pushed into the head unit 41. Then, as shown in FIG. 12, the movement of the head unit 41 in the direction approaching the rotation shaft 31 is restricted by the right-side movement restricting member MR, which is closer to the rotation shaft 31 of the opening-closing unit 3. Furthermore, as the left-side end of the head unit 41 in FIG. 12, which is separated from the rotation shaft 31 of the opening-closing unit 3, is pushed into the platen unit 42, the head unit 41 swings about the axis Ax, which is parallel to the conveyance direction Df of the recording paper P, with the right-side movement restricting member MR as a fulcrum, as shown by arrow A12. As a result, the protrusion 41p housed in the left-side cutout 23c, which is separated from the rotation shaft 31 of the opening-closing unit 3, moves away from the platen unit 42, and the head unit 41 tilts in accordance with the platen unit 42. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in contact with each other uniformly across the width of the recording paper P.

[0061] Furthermore, when the opening / closing lever 8 is rotated to the lock position with the opening / closing unit 3 closed relative to the main body 2 to fix the opening / closing unit 3 to the main body 2, the head unit 41 is no longer pushed in by the platen unit 42, and the head unit 41 returns to the first state shown in FIG. 8. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in uniform contact in the width direction of the recording paper P. Therefore, according to the printing device 1 of this embodiment, when the opening / closing unit 3 is closed relative to the main body 2, the head unit 41 and the platen unit 42 can always be in contact with each other in a parallel state, and to be in uniform contact in the width direction of the recording paper P.

[0062] Furthermore, as shown in FIG. 8 , if a connector 41c is provided in the longitudinal center of the head unit 41, it is difficult to form a fulcrum for swinging the head unit 41 in the longitudinal center of the head unit 41. Furthermore, using a shaft, pin, or the like to form a swing support mechanism for the width direction of the recording paper P increases component costs. In contrast, the printing device 1 of this embodiment swings the head unit 41 by providing a protrusion 41p between the longitudinal center and both ends of the head unit 41 and supporting the protrusion 41p with the cutout 23c of the head frame 23. This allows the head unit 41 to be swingably supported while avoiding interference with the connector 41c provided in the longitudinal center of the head unit 41. Furthermore, because no shaft or pin is used to swingably support the head unit 41, component costs can be reduced.

[0063] Furthermore, in the printing device 1 of this embodiment, the notch 23c of the head frame 23 includes a first wall 23c1, a second wall 23c2, and a third wall 23c3. The first wall 23c1 contacts the protrusion 41p in a first state in which the head unit 41 is supported parallel to the width direction of the recording paper P. The second wall 23c2 is provided opposite the first wall 23c1, and in the first state, there is a gap between it and the protrusion 41p. The third wall 23c3 is provided between the second wall 23c2 and the third wall 23c3, and there is a gap between it and the protrusion 41p.

[0064] With this configuration, the gap between the second wall 23c2 and the protrusion 41p shown in Fig. 9 and the gap between the third wall 23c3 and the protrusion 41p allow the head unit 41 to swing about the axis Ax parallel to the transport direction Df of the recording paper P, as shown by arrows A11 and A12 in Figs. 11 and 12. Furthermore, the gap between the second wall 23c2 and the protrusion 41p shown in Fig. 9 allows the head unit 41 to swing about the axis Ay parallel to the width direction of the recording paper P, as shown by arrow A10 in Fig. 10.

[0065] In addition, in the printing device 1 of this embodiment, the third wall 23c3 of the cutout portion 23c includes an inclined surface that inclines so as to widen outward in the width direction of the recording paper P as it moves away from the platen unit 42 in the direction opposite to the biasing direction of the head unit 41 by the biasing member 23p, as shown in Figure 9.

[0066] 9, a gap can be formed between the third wall 23c3 and the protrusion 41p when the end face of the protrusion 41p facing the third wall 23c3 is perpendicular to the longitudinal direction of the head unit 41. By forming such a gap between the third wall 23c3 and the protrusion 41p, it is possible to allow the head unit 41 to swing around the axis Ax parallel to the transport direction Df of the recording paper P, as shown by arrows A11 and A12 in FIGS.

[0067] In addition, in the printing device 1 of this embodiment, the movement regulating portion MR is provided between the first wall 23c1 and the third wall 23c3 of the cutout portion 23c, and abuts against the protrusion portion 41p of the head unit 41 in the first state shown in Figures 8 and 9 to regulate the movement of the recording paper P in the width direction.

[0068] With this configuration, in the first state in which the head unit 41 is parallel to the width direction of the recording paper P, the notch 23c functions as a movement restricting portion MR, restricting longitudinal movement of the head unit 41. This allows the head unit 41 to swing around the axis Ax parallel to the transport direction Df of the recording paper P, with the movement restricting portion MR as a fulcrum, as shown in Figures 11 and 12.

[0069] In the printing device 1 of this embodiment, the head unit 41 has guide protrusions 41g at both ends in the longitudinal direction, as shown in Fig. 8. The head frame 23 also has guide grooves 23g that engage with the guide protrusions 41g to guide the swinging of the head unit 41 around an axis Ay that is parallel to the width direction of the recording paper P, as shown in Figs. 6 and 10.

[0070] With this configuration, the guide protrusions 41g of the head unit 41 can be engaged with the guide grooves 23g of the head frame 23, restricting movement of the head unit 41 in the transport direction Df of the recording paper P. This allows the head unit 41 to stably swing around the axis Ay parallel to the width direction of the recording paper P. Furthermore, the guide protrusions 41g of the head unit 41, which swings around the axis Ax parallel to the transport direction Df of the recording paper P, can be guided by the guide grooves 23g of the head frame 23. This allows the swing of the head unit 41 around the axis Ax parallel to the transport direction Df of the recording paper P to be stabilized.

[0071] As described above, the printing device 1 of this embodiment includes a head unit 41 that prints on recording paper P, a platen unit 42 that transports the recording paper P, a main body 2, an opening / closing unit 3, and a head frame 23. The main body 2 supports the head unit 41 or the platen unit 42. The opening / closing unit 3 is rotatably connected to the main body 2 about a rotation axis 31 that is perpendicular to the width direction of the recording paper P, and supports the platen unit 42 or the head unit 41 that is not supported by the main body 2. The head frame 23 is provided on the main body 2 or the opening / closing unit 3 that supports the head unit 41. The head unit 41 has protrusions 41p that protrude rearward in the transport direction Df of the recording paper P between the center and both ends in the longitudinal direction along the width direction of the recording paper P. The head frame 23 has cutouts 23c that accommodate the protrusions 41p and biasing members 23p that bias the head unit 41 toward the platen unit 42. There is a gap between the notch 23c and the protrusion 41p that allows the head unit 41 to swing around an axis Ax parallel to the rotation shaft 31 and an axis Ay parallel to the width direction of the recording paper P. Furthermore, the notch 23c abuts against the protrusion 41p when the head unit 41 is supported parallel to the width direction of the recording paper P, thereby restricting movement of the head unit 41 in the width direction of the recording paper P.

[0072] With this configuration, in the printing device 1 of this embodiment, as the opening / closing unit 3 is gradually closed from an open state relative to the main body 2, the head unit 41 and the platen unit 42 begin to come into contact with each other at the end portion near the rotation shaft 31 of the opening / closing unit 3. At this time, the head unit 41 is urged toward the platen unit 42 by the urging member 23p, and as shown in FIG. 11, movement of the head unit 41 in a direction away from the rotation shaft 31 is restricted by the left-side notch 23c that is spaced apart from the rotation shaft 31 of the opening / closing unit 3. Furthermore, as the end portion on the right side in FIG. 11 that is close to the rotation shaft 31 of the opening / closing unit 3 comes into contact with the platen unit 42, the head unit 41 swings around the axis Ax parallel to the transport direction Df of the recording paper P, as shown by arrow A11, with the point of contact between the left-side notch 23c and the left-side protrusion 41p as a fulcrum. As a result, the protrusion 41p housed in the notch 23c on the right side near the rotation shaft 31 of the opening / closing part 3 moves away from the platen unit 42, and the head unit 41 tilts to match the platen unit 42. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in uniform contact with the recording paper P in the width direction.

[0073] 10, the head unit 41 swings around an axis Ay parallel to the width direction of the recording paper P, with the point of contact between the protrusion 41p and the notch 23c as a fulcrum. This allows the contact pressure between the head unit 41 and the platen unit 42 to be adjusted, allowing the head unit 41 and the platen unit 42 to come into more uniform contact with each other.

[0074] Furthermore, when the opening-closing unit 3 is completely closed relative to the main body 2, the end of the platen unit 42 that is separated from the rotation shaft 31 of the opening-closing unit 3 is pushed into the head unit 41. Then, as shown in FIG. 12, the movement of the head unit 41 in the direction toward the rotation shaft 31 is restricted by the right-side notch 23c that is close to the rotation shaft 31 of the opening-closing unit 3. Furthermore, as the left-side end of the head unit 41 in FIG. 12 that is separated from the rotation shaft 31 of the opening-closing unit 3 is pushed into the platen unit 42, the head unit 41 swings around the axis Ax that is parallel to the conveyance direction Df of the recording paper P, as shown by arrow A12, with the contact point between the right-side notch 23c and the right-side protrusion 41p as the fulcrum. As a result, the protrusion 41p accommodated in the left-side notch 23c that is separated from the rotation shaft 31 of the opening-closing unit 3 moves away from the platen unit 42, and the head unit 41 tilts in accordance with the platen unit 42. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in contact with each other uniformly across the width of the recording paper P.

[0075] Furthermore, when the opening / closing lever 8 is rotated to the lock position with the opening / closing unit 3 closed relative to the main body 2 to fix the opening / closing unit 3 to the main body 2, the head unit 41 is no longer pushed in by the platen unit 42, and the head unit 41 returns to the first state shown in FIG. 8. This allows the head unit 41 and the platen unit 42 to be in contact with each other in a parallel state, and to be in uniform contact in the width direction of the recording paper P. Therefore, according to the printing device 1 of this embodiment, when the opening / closing unit 3 is closed relative to the main body 2, the head unit 41 and the platen unit 42 can always be in contact with each other in a parallel state, and to be in uniform contact in the width direction of the recording paper P.

[0076] As described above, according to this embodiment, when the opening / closing section 3 is rotatably connected to the main body section 2 around a pivot axis 31 perpendicular to the width direction of the recording paper P and configured to be openable and closable, a printing device 1 can be provided that can bring the head unit 41 and the platen unit 42 into uniform contact in the width direction of the recording paper P.

[0077] [Embodiment 2] Next, a second embodiment of a printing device according to the present disclosure will be described with reference to Figures 13 to 15. Figure 13 is an enlarged view of a protrusion 41p and a cutout 23c of a printing device 1 in the second embodiment. Figure 14 is a top view of a head unit 41 and a platen unit 42 of a printing device 1 of this embodiment. Figure 15 is an enlarged view of a protrusion 41t of the head unit 41 and a side wall 23s of a head frame 23.

[0078] The printing device 1 of this embodiment differs from the printing device 1 of the above-described first embodiment in that convex portions 41t are provided on both longitudinal ends of the head unit 41, and movement restricting portions MR that restrict movement of the head unit 41 in the longitudinal direction are side walls 23s of the head frame 23 that abut against the convex portions 41t of the head unit 41. The other configuration of the printing device 1 of this embodiment is the same as that of the printing device 1 of the above-described first embodiment, and therefore similar parts are given the same reference numerals and description thereof will be omitted.

[0079] 13, in the printing device 1 of this embodiment, the third wall 23c3 of the cutout portion 23c is parallel to the cutting direction Dc (Z-axis direction) of the recording paper P. Therefore, in a first state in which the head unit 41, which is urged toward the platen unit 42 by the urging member 23p, is parallel to the width direction of the recording paper P, the third wall 23c3 of the cutout portion 23c and the protrusion 41p do not come into contact with each other, and a gap is formed between the third wall 23c3 and the protrusion 41p. Therefore, in the first state of the head unit 41, the cutout portion 23c cannot restrict longitudinal movement of the head unit 41.

[0080] 14 and 15, convex portions 41t are provided on both ends of the head unit 41 in the longitudinal direction. The convex portions 41t are provided, for example, on the heat sink 41r, and are provided adjacent to the rear side of the guide protrusions 41g in the transport direction Df (X-axis direction) of the recording paper P. The tips of the convex portions 41t abut against the insides of the side walls 23s provided on both ends of the head frame 23 in the longitudinal direction.

[0081] In the printing device 1 of this embodiment, the side walls 23s of the head frame 23 abut against the convex portions 41t of the head unit 41 from both sides in the longitudinal direction of the head unit 41, and function as movement restricting portions MR that restrict movement of the head unit 41 in the longitudinal direction. That is, in this embodiment, the movement restricting portions MR that restrict movement of the head unit 41 in the longitudinal direction are the side walls 23s of the head frame 23 that abut against the convex portions 41t provided on both ends of the head unit 41 in the longitudinal direction.

[0082] More specifically, the printing device 1 of this embodiment includes a head unit 41 that prints on recording paper P, a platen unit 42 that transports the recording paper P, a main body 2, an opening / closing unit 3, and a head frame 23. The main body 2 supports the head unit 41 or the platen unit 42. The opening / closing unit 3 is rotatably connected to the main body 2 about a rotation axis 31 that is perpendicular to the width direction of the recording paper P, and supports the platen unit 42 or head unit 41 that is not supported by the main body 2. The head frame 23 is provided on the main body 2 or the opening / closing unit 3 that supports the head unit 41. The head unit 41 has protrusions 41p that protrude rearward in the transport direction Df of the recording paper P between the center and both ends in the longitudinal direction along the width direction of the recording paper P, and convex portions 41t provided at both ends in the longitudinal direction. The head frame 23 has a notch 23c that accommodates the protrusion 41p, side walls 23s that abut against the convex portion 41t from both longitudinal sides of the head unit 41, and a biasing member 23p that biases the head unit 41 toward the platen unit 42. The notch 23c has a gap between it and the protrusion 41p that allows the head unit 41 to swing around an axis Ax parallel to the rotation shaft 31 and an axis Ay parallel to the width direction of the recording paper P.

[0083] With this configuration, even when the notched portions 23c of the head frame 23 do not function as the movement restricting portions MR, the side walls 23s of the head frame 23 can function as the movement restricting portions MR to restrict the longitudinal movement of the head unit 41. Therefore, according to this embodiment, similar to the first embodiment described above, it is possible to provide a printing device 1 that can bring the head unit 41 and the platen unit 42 into uniform contact in the width direction of the recording paper P.

[0084] [Embodiment 3] Next, a third embodiment of a printing device according to the present disclosure will be described with reference to Fig. 16. Fig. 16 is an enlarged view of a protrusion 41p and a notch 23c of a printing device 1 according to the third embodiment.

[0085] The printing device 1 of this embodiment differs from the printing device 1 of the above-described first embodiment in that the third wall 23c3 of the cutout portion 23c of the head frame 23 has an arc shape that allows the head unit 41 to swing around the axis Ax that is parallel to the rotation axis 31 of the opening / closing unit 3. The other configuration of the printing device 1 of this embodiment is similar to that of the printing device 1 of the above-described first embodiment, and therefore similar parts are given the same reference numerals and description thereof will be omitted.

[0086] With this configuration, according to the printing device 1 of this embodiment, similar to the printing device 1 of embodiment 1, interference between the third wall 23c3 and the protrusion 41p in the cutout portion 23c can be avoided, and the head unit 41 can be allowed to swing around the axis Ax parallel to the rotation axis 31 of the opening / closing unit 3. Therefore, according to this embodiment, similar to the above-described embodiment 1, it is possible to provide a printing device 1 that can bring the head unit 41 and the platen unit 42 into uniform contact in the width direction of the recording paper P.

[0087] [Embodiment 4] Next, a fourth embodiment of a printing device according to the present disclosure will be described with reference to Fig. 17. Fig. 17 is an enlarged view of a protrusion 41p and a notch 23c of a printing device 1 according to the fourth embodiment.

[0088] The printing device 1 of this embodiment differs from the printing device 1 of the above-described first embodiment in that the third wall 23c3 of the cutout portion 23c of the head frame 23 includes not only an inclined surface that is inclined with respect to the biasing direction of the head unit 41 by the biasing member 23p, but also a flat surface. The other configuration of the printing device 1 of this embodiment is similar to that of the printing device 1 of the above-described first embodiment, and therefore similar parts are designated by the same reference numerals and description thereof will be omitted.

[0089] 17, in the printing device 1 of this embodiment, the third wall 23c3 of the cutout portion 23c includes an inclined surface, similar to the printing device 1 of Embodiment 1. This inclined surface is inclined so as to widen outward in the width direction (Y-axis direction) of the recording paper P as it moves away from the platen unit 42 in the direction opposite to the biasing direction of the head unit 41 by the biasing member 23p (positive Z-axis direction). In addition, the third wall 23c3 has a flat surface between the inclined surface and the second wall 23c2 that follows the biasing direction of the head unit 41 by the biasing member 23p.

[0090] With this configuration, according to the printing device 1 of this embodiment, similar to the printing device 1 of embodiment 1, interference between the third wall 23c3 and the protrusion 41p in the cutout portion 23c can be avoided, and the head unit 41 can be allowed to swing about the axis Ax parallel to the rotation axis 31 of the opening / closing portion 3. Therefore, according to this embodiment, similar to the above-described embodiment 1, it is possible to provide a printing device 1 that can bring the head unit 41 and the platen unit 42 into uniform contact in the width direction of the recording paper P.

[0091] The above is a detailed description of an embodiment of a printing device according to the present disclosure. However, the printing device according to the present disclosure is not limited to the above-described embodiment. Various modifications, substitutions, etc. may be applied to the above-described embodiment without departing from the scope of the present disclosure. [Explanation of symbols]

[0092] 1 printing device, 2 main body, 23 head frame, 23c notch, 23c1 first wall, 23c2 second wall, 23c3 third wall, 23g guide groove 23p urging member, 23s side wall, 3 opening / closing portion, 31 pivot shaft, 41 head unit, 41g guide protrusion, 41p protrusion, 41t convex portion, 42 platen unit, Ax axis parallel to pivot shaft, Ay axis parallel to width direction of recording paper, MR movement regulating portion, P recording paper.

Claims

1. a head unit that prints on recording paper; a platen unit that transports the recording paper; a main body portion that supports the head unit or the platen unit; an opening / closing section that is rotatably connected to the main body section around a rotation axis that is perpendicular to the width direction of the recording paper, and that supports the platen unit or the head unit that is not supported by the main body section; a head frame provided on the main body portion or the opening / closing portion to support the head unit, the head unit has protrusions that protrude rearward in the conveyance direction of the recording paper between a center portion and both ends in a longitudinal direction along the width direction of the recording paper, the head frame has a notch that accommodates the protrusion, a movement restricting portion that abuts against a part of the head unit from both sides in the longitudinal direction, and a biasing member that biases the head unit toward the platen unit, A printing device, wherein the notch has a gap between it and the protrusion that allows the head unit to swing around an axis parallel to the rotation axis and an axis parallel to the width direction of the recording paper.

2. The notch portion includes a first wall that contacts the protrusion in a first state in which the head unit is supported parallel to the width direction of the recording paper, a second wall that is provided opposite the first wall and has the gap between it and the protrusion in the first state, and a third wall that is provided between the first wall and the second wall and has the gap between it and the protrusion. The printing device of claim 1 .

3. the third wall of the notch portion includes an inclined surface that is inclined so as to widen outward in the width direction of the recording paper as the third wall becomes more distant from the platen unit in the direction opposite to the biasing direction of the head unit by the biasing member, The printing device according to claim 2 .

4. the movement restricting portion is provided between the first wall and the third wall of the notch portion and abuts against the protrusion of the head unit in the first state to restrict movement of the recording paper in the width direction. The printing device according to claim 3 .

5. the third wall of the notch portion has an arc shape that allows the head unit to swing around an axis parallel to the rotation axis. The printing device according to claim 2 .

6. the movement restricting portion is a side wall of the head frame that abuts against a protrusion provided at each end of the head unit in the longitudinal direction, The printing device of claim 1 .

7. the head unit has guide protrusions on both ends in the longitudinal direction, the head frame has a guide groove that engages with the guide protrusion to guide the swing of the head unit around an axis parallel to the width direction of the recording paper; The printing device of claim 1 .

8. a head unit that prints on recording paper; a platen unit that transports the recording paper; a main body portion that supports the head unit or the platen unit; an opening / closing section that is rotatably connected to the main body section around a rotation axis that is perpendicular to the width direction of the recording paper, and that supports the platen unit or the head unit that is not supported by the main body section; a head frame provided on the main body portion or the opening / closing portion to support the head unit, the head unit has protrusions that protrude rearward in the conveyance direction of the recording paper between a center portion and both ends in a longitudinal direction along the width direction of the recording paper, the head frame has a notch that accommodates the protrusion and a biasing member that biases the head unit toward the platen unit, A printing device in which the notch portion has a gap between it and the protrusion portion that allows the head unit to swing around an axis parallel to the pivot axis and an axis parallel to the width direction of the recording paper, and the head unit abuts against the protrusion portion while being supported parallel to the width direction of the recording paper, thereby regulating movement of the head unit in the width direction of the recording paper.

9. a head unit that prints on recording paper; a platen unit that transports the recording paper; a main body portion that supports the head unit or the platen unit; an opening / closing section that is rotatably connected to the main body section around a rotation axis that is perpendicular to the width direction of the recording paper, and that supports the platen unit or the head unit that is not supported by the main body section; a head frame provided on the main body portion or the opening / closing portion to support the head unit, the head unit has protrusions that protrude rearward in the conveyance direction of the recording paper between a center portion and both ends in a longitudinal direction along the width direction of the recording paper, and convex portions provided at both ends in the longitudinal direction, the head frame has a notch that accommodates the protrusion, side walls that abut against the convex portion from both sides in the longitudinal direction, and a biasing member that biases the head unit toward the platen unit, A printing device, wherein the notch has a gap between it and the protrusion that allows the head unit to swing around an axis parallel to the rotation axis and an axis parallel to the width direction of the recording paper.

Images