JP2011251515A - Portable printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a portable printer for printing on a paper sheet to be printed as desired strong against an impact of a fall etc.SOLUTION: Base ends of side chassis members 130L, 130R are positioned at longitudinally both-end positions of a main chassis member 150 by projections 157 formed at both ends in the longitudinal direction of the main chassis member 150. The side chassis member 130L on the left side and the side chassis member 130R on the right side are connected by a front-side rib 151 of the main chassis member 150 at an intermediate position between the base ends of the side chassis members 130L, 130R and an installation part of a platen roller 111 or a thermal line head 112.

Description

  The present invention relates to a portable printer that performs desired printing on a printing paper.

  A portable printer that performs desired printing on a printing paper is known (see, for example, Patent Document 1). The portable printer includes a platen roller that conveys a printing paper, a thermal line head that performs desired printing on the printing paper conveyed by the platen roller, and includes the platen roller and the thermal line head. And a housing constituting an outer shell of the device. The platen roller is rotatably provided on a pair of side chassis members erected on the left and right sides of the under cover that constitutes the lower portion of the housing. Further, the thermal line head is rotatably provided on the side chassis member via a shaft member so as to be capable of being pressed against the platen roller.

JP 7-309041 A

  In general, portable printers are carried and used in various places. For this reason, there is a possibility that the portable printer may accidentally drop or come into contact with other articles during use, and it is necessary to design the strength in consideration of the impact at this time.

  Here, the conventional portable printer has a structure in which a pair of side chassis members are erected on the left and right sides of the under cover. The platen roller and the thermal line head (including the heat radiating plate) supported by the side chassis member are components that are relatively heavy among the components of the portable printer because the components include metal objects. . For this reason, when the portable printer receives a strong impact due to dropping or the like, the pair of side chassis members are deformed so as to open due to the inertia of the heavy object, and the platen roller and the thermal line head are detached from the side chassis members. There was a risk of it.

  An object of the present invention is to provide a portable printer that is resistant to impacts such as when dropped.

  In order to achieve the above object, a portable printer according to a first aspect of the present invention is a portable printer that performs desired printing on a printing paper, and is transported by a platen roller that carries the printing paper and the platen roller. A thermal line head that performs desired printing on the printing paper, and a pair of side chassis members that rotatably support the platen roller and that support the thermal line head so as to be in pressure contact with the platen roller; A housing having a top cover constituting the upper part of the device outer shell and an under cover constituting the lower part of the device outer shell, and a main chassis provided on the inner surface of the under cover, wherein the side chassis members are erected from both longitudinal ends. And the main chassis member has a base end portion of the side chassis member as the main chassis member. Positioning means for positioning at both longitudinal end positions of the chassis member, and at the intermediate position between the base end portion of the side chassis member and the platen roller or the installation portion of the thermal line head, the one side chassis member and the other A side chassis connecting portion that connects the side chassis member on the side is integrally provided.

  In the portable printer according to the first aspect of the present invention, the platen roller is rotatably supported by the side chassis members erected from both longitudinal ends of the main chassis member, and the thermal line head can be pressed against the platen roller. It is supported by.

  Here, the platen roller supported by the side chassis member and the thermal line head (including the heat radiating plate) include metal objects in the components thereof, and thus are relatively heavy components among the components of the portable printer. It is. For this reason, when the portable printer receives a strong impact due to dropping or the like, the pair of side chassis members are deformed so as to open each other due to the inertia of the heavy object, and the platen roller and the thermal line head are detached from the side chassis members. There is a fear.

  Accordingly, in the first invention of the present application, the base chassis member is positioned at both longitudinal positions of the main chassis member by the positioning means of the main chassis member, and the side chassis member by the side chassis connection portion of the main chassis member. The side chassis member on one side and the side chassis member on the other side are connected at an intermediate position between the base end portion and the platen roller or thermal line head installation portion. As a result, the side chassis member is fixed so that the distance between the base end portions thereof is the length of the main chassis member in the longitudinal direction, and the base end portion and the platen roller or thermal line head installation portion, which is the upper position thereof, are fixed. The distance at the intermediate position is also fixed by the side chassis connecting portion so as to be the longitudinal length of the main chassis member.

  In this way, since the distance between the side chassis members can be fixed at the base end portion and two positions in the vertical direction above the base end portion, even when the portable printer receives a strong impact due to dropping or the like as described above, It can suppress that a pair of side chassis member deform | transforms so that it may mutually open by the inertia of heavy objects, such as a platen roller and a thermal line head. As a result, it is possible to prevent the platen roller and the thermal line head from being detached from the side chassis member, so that a portable printer that is resistant to impacts such as when dropped can be realized.

  In addition, since the main chassis member is integrally provided with the positioning means and the side chassis connecting portion, it is not necessary to separately provide a member for positioning and connecting the side chassis member, and the number of parts can be reduced.

  The portable printer according to a second aspect of the present invention is the portable printer according to the first aspect, wherein the side chassis connecting portion is configured such that one end side in the short direction of the main chassis member faces the arrangement side of the platen roller and the thermal line head. It is a rib part with an L-shaped cross section bent along the longitudinal direction.

  In the second invention of the present application, a rib portion having an L-shaped cross section is formed by bending the main chassis member along the longitudinal direction toward the arrangement side of the platen roller and the thermal line head. The side chassis member and the other side chassis member are connected. By setting it as the connection structure using such a rib part, a side chassis member can be connected in a position above a base end part. As a result, the distance between the side chassis members can be fixed at two positions in the vertical direction between the base end portion and the upper position thereof, and the deformation of the side chassis members can be reliably suppressed.

  Further, since the side chassis connecting portion can be configured only by bending the main chassis member, the manufacturing becomes easy and the structure of the portable printer can be simplified. Furthermore, by forming the rib portion on the main chassis member, the strength of the main chassis member itself can be increased, and the portable printer can be made to have a structure that is stronger against impacts such as when dropped.

  The portable printer according to a third aspect of the present invention is the portable printer according to the second aspect, wherein the rib portion has a first fixing portion fixed to the one side chassis member on one end side in the longitudinal direction, and the other side chassis. A second fixing portion fixed to the member is provided on the other end side in the longitudinal direction, and the first fixing portion and the second fixing portion have both longitudinal ends of the rib portion in the surface direction of the side chassis member. It is characterized by being bent so as to follow.

  In the third invention of the present application, the first fixing portion and the second fixing portion are formed by bending both longitudinal ends of the rib portion along the surface direction of the side chassis member. As a result, the first fixing portion and the second fixing portion can be made substantially parallel to the surface direction of the side chassis member, so that both the fixing portions can be firmly and stably fixed to the side chassis member with screws or the like. .

  A portable printer according to a fourth aspect of the present invention is the portable printer according to any one of the first to third aspects, wherein the positioning means are protrusions provided at both ends in the longitudinal direction of the main chassis member. The base end portion of the side chassis member is positioned at both ends in the longitudinal direction of the main chassis member by engaging with an engagement hole provided in the base end portion of the chassis member.

  In the fourth invention of the present application, the protrusions provided at both ends in the longitudinal direction of the main chassis member are engaged with the engagement holes provided at the base end portion of the side chassis member, so that the base end portion of the side chassis member is The main chassis member is positioned at both ends in the longitudinal direction. By setting it as such a structure, the base end part of a side chassis member can be easily positioned with a simple structure in the longitudinal direction both ends position of a main chassis member.

  According to the present invention, by suppressing the deformation of the side chassis member, it is possible to make it stronger against an impact when dropped.

1 is a perspective view illustrating an external configuration of a portable printer according to an embodiment of the present invention. It is a sectional side view by the II-II section in Drawing 1 showing the internal structure of a portable printer. It is a block diagram showing the functional composition of a portable printer. It is a figure which represents simply the electrode structure of a power key and a feed key. FIG. 5 is a cross-sectional view corresponding to a VV cross section in FIG. 4. FIG. 5 is a cross-sectional view corresponding to a VI-VI cross section in FIG. 4. It is a figure for demonstrating the effect acquired by making the depressing force of a power key and a feed key differ. 6 is a flowchart showing control contents related to operation of a power key and a feed key executed by a CPU in a power-on state of the portable printer. It is the disassembled perspective view seen from the front side diagonally upward direction showing the internal structure of a portable printer. It is the perspective view seen from the diagonally upper direction showing the detailed structure of a guide member and a beam member. It is the perspective view seen from the diagonally downward direction showing the detailed structure of a guide member and a beam member. It is a figure showing the shape of an engagement hole and a positioning hole. FIG. 4 is a partially enlarged side sectional view showing a relative positional relationship among a guide member, a platen roller, and a thermal line head. It is a perspective view showing the detailed structure of a main chassis member. It is the perspective view seen from diagonally downward direction showing the detailed structure of a heat sink. It is a sectional side view of the heat sink showing the structure of a spring receiving part. It is a disassembled perspective view of the chassis assembly showing the fixation structure of a side chassis member and a main chassis member. It is a disassembled perspective view of the chassis assembly showing the fixation structure of a side chassis member and a main chassis member. It is the disassembled perspective view seen from the back side slanting upper direction showing the internal structure of a portable printer. It is a perspective view showing the detailed structure inside a top cover. It is a cross-sectional view of a portable printer showing the structure near the first boss part and the second boss part. It is the perspective view which looked at the portable printer from the back side diagonally upper direction showing the state which removed the battery chamber cover and opened the battery storage chamber. It is a horizontal sectional view of a portable printer. It is the perspective view seen from the left diagonal upper direction showing the detailed structure of a battery chamber cover. It is the perspective view seen from the right diagonal upward direction showing the detailed structure of a battery chamber cover. 6 is a flowchart showing control contents related to operations of a power key and a feed key executed by a CPU in a modified example in which a feed key is given priority when operated simultaneously. 10 is a flowchart showing control contents related to operation of a power key and a feed key executed by a CPU in a modification example in which the power key is a double-click operation.

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

  With reference to FIG. 1, an external configuration of a portable printer 1 according to an embodiment of the present invention will be described. In the following description, the lower left direction in FIG. 1 is front, the upper right direction is rear, the upper left direction is left, and the lower right direction is right.

  The portable printer 1 prints print data received from an external device 2 (see FIG. 3 described later) such as a PC terminal or a mobile phone via a wired communication or a wireless communication on a printing paper S. The portable printer 1 can be driven by using a rechargeable battery 10 (see FIG. 2 and the like described later) as a power source, and can be carried and used in various places.

  The portable printer 1 is provided with a substantially rectangular parallelepiped housing 100 that is made of a resin material and that forms the outer shell of the apparatus. The housing 100 includes a top cover 101 that constitutes the upper part of the outer shell of the apparatus, an under cover 102 that constitutes the lower part of the outer shell of the apparatus, and a cover member 103 that can be opened and closed on the upper front side of the top cover 101. At the time of printing, the printing paper S is inserted into the insertion port 104 formed between the top cover 101 and the cover member 103. The inserted printing paper S is guided to a pressure contact portion P (see FIG. 2) between a platen roller 111 and a thermal line head 112, which will be described later, by a guide member 120 provided below the insertion port 104, and after printing is completed. It is discharged from a discharge port 107 formed between the cover member 103 and the under cover 102.

  The internal structure of the portable printer 1 will be described with reference to FIG.

  A platen roller 111 and a thermal line head 112 are provided in the housing 100 of the portable printer 1. The platen roller 111 is rotatably supported by a pair of side chassis members 130L and 130R (see FIG. 9 and the like which will be described later) provided inside the housing 101, and is driven by the drive motor 11 (see FIG. 3 and the like which will be described later). The printing paper S is conveyed by being driven to rotate. The thermal line head 112 is provided on a heat radiating plate 114 provided with a shaft member 113 at the rear end, and the heat radiating plate 114 can be rotated around the shaft member 113 by the side chassis members 130L and 130R. It is supported. The main chassis member 150 provided on the inner surface of the under cover 102 is provided with a plurality of coil springs 115 that urge the heat sink 114 that supports the thermal line head 112 toward the platen roller 111. . As a result, the thermal line head 112 can be brought into pressure contact with the platen roller 111, contacts the platen roller 111 with a predetermined pressure during printing, and performs desired printing on the printing paper S inserted therebetween.

  During normal printing, by inserting the printing paper S into the insertion port 104 with the cover member 103 closed, the printing paper S is conveyed by the platen roller 111 while being guided by the guide member 120, and the thermal printing is performed. The line head 112 performs desired printing. When a paper jam or the like occurs, the platen roller 111 is released from the thermal line head 112 by opening the cover member 103, and the paper can be easily pulled out.

  On the rear side of the housing 100, a battery storage chamber 105 that houses the substantially rod-shaped rechargeable battery 10 is provided. A battery chamber cover 170 is detachably provided in the battery storage chamber 105. In a state where the battery chamber cover 170 is removed, the battery storage chamber 105 opens in the rear portion of the housing 100 (see FIG. 22 described later).

  The functional configuration of the portable printer 1 will be described with reference to FIG.

  The portable printer 1 has a CPU 12. The CPU 12 performs signal processing according to a program stored in advance in the ROM 14 while using the temporary storage function of the SDRAM 13, thereby controlling the entire portable printer 1.

  The CPU 12 performs drive control of the power supply circuit 15 that performs power on / off processing of the portable printer 1, the motor drive circuit 16 that performs drive control of the drive motor 11 that drives the platen roller 111, and the thermal line head 112. It is connected to the thermal head control circuit 17.

  The CPU 12 is connected to a paper detection sensor 18, a feed key 40 for performing a paper feed operation, and a power key 30 for performing a power on / off operation. Based on the detection result of the paper detection sensor 18, the CPU 12 detects whether the printing paper S is inserted into the insertion port 104. Further, when the power key 30 or the feed key 40 is depressed, the CPU 12 executes a process corresponding to the depressed key. That is, when the feed key 40 is depressed, the CPU 12 outputs a control signal to the motor drive circuit 16, drives the drive motor 11 to rotate the platen roller 111, and feeds the printing paper S by a predetermined amount. I do. When the power key 30 is depressed while the portable printer 1 is in the power-off state, the CPU 12 outputs a control signal to the power circuit 15 to perform power-on processing, and when the power key 30 is depressed in the power-on state. Then, a control signal is output to the power supply circuit 15 to perform power-off processing.

  For example, the feed key 40 feeds paper in order to start printing from an intermediate position in the conveyance direction of the printing paper S, or uses a printing paper S whose conveyance direction length is longer than a predetermined length. This operation is performed when the paper is discharged after printing is completed.

  The CPU 12 is connected to the USB interface drive circuit 21, the wireless communication unit 22, and the infrared communication unit 23. The USB interface drive circuit 21 controls communication performed with the external device 2 via a USB cable (not shown) connected to the USB terminal 24 (see FIG. 1). The wireless communication unit 22 controls wireless communication using radio waves other than infrared rays performed with the external device 2. The infrared communication unit 23 controls infrared communication performed with the external device 2.

  Switching of the communication standard between the wireless communication and the infrared communication is performed as follows. That is, when the power key 30 is pressed while the feed key 40 is pressed in the power-off state, the CPU 12 executes a power-on process and switches communication standards. Therefore, when the operation is performed when the communication standard is wireless communication, the operation is switched to infrared communication. When the operation is performed when the communication standard is infrared communication, the operation is switched to wireless communication.

  In such a configuration, when printing with the portable printer 1, the operator inputs print data to be printed on the printing paper S in the external device 2 such as a PC terminal or a mobile phone, and also issues a print start instruction. Make input. As a result, print data is transmitted from the external device 2 to the portable printer 1 via the USB cable, wireless communication, or infrared communication, and the portable printer 1 performs printing based on the print data.

  In the portable printer 1 having the basic configuration as described above, the power key 30 and the feed key 40 have different pressing forces required for operation. Next, the details will be described.

  The configuration of the power key 30 and the feed key 40 will be described with reference to FIGS.

  As shown in FIG. 1 described above, in the portable printer 1, the power key 30 and the feed key 40 are concentrated on the key operation unit 106 provided on the upper left side of the top cover 101 and are adjacent to each other. Are arranged. As shown in FIGS. 5 and 6, the keys 30, 40 are arranged from the upper side to the lower side, key panels 31, 41, spacers 32, 42, grounded GND electrodes 33, 43, and keys connected to the CPU 12. Electrodes 34 and 44, substrates 35 and 45 made of polyethylene terephthalate (PET), etc., anti-static layers 36 and 46 made of silver for anti-static measures, and protective films 37 and 47 are laminated in this order. ing.

  As shown in FIG. 4, the GND electrodes 33 and 43 are integrally formed on the substrates 35 and 45 so as to surround the key electrodes 34 and 44. The key electrodes 34 and 44 are connected to the CPU 12 by wirings 38 and 48 patterned on the substrates 35 and 45, respectively.

  Inside the key panels 31 and 41, a metal metal dome having bulging portions 39a and 49a that swell in a spherical shape toward the key panel 31 and 41 in the space formed by the spacers 32 and 42. Members 39 and 49 are provided. These metal dome members 39 and 49 apply a reaction force to the pressing force of the keys 30 and 40 by utilizing the warping of the bulging portions 39a and 49a. Thereby, when the operator depresses the keys 30 and 40, a click feeling is obtained, and a good operation feeling is obtained. The metal dome members 39 and 49 also serve as contact points for connecting the key electrodes 34 and 44 and the GND electrodes 33 and 43 when the keys 30 and 40 are pushed down.

  At this time, as shown in FIGS. 5 and 6, the bulging amount h <b> 1 of the bulging portion 39 a of the metal dome member 39 is configured to be larger than the bulging amount h <b> 2 of the bulging portion 49 a of the metal dome member 49. ing. Thereby, since the metal dome member 39 gives a larger reaction force than the metal dome member 49, a larger pressing force is required to operate the power key 30 than when the feed key 40 is operated. .

  The effect obtained by the above configuration will be described with reference to FIG.

  In the portable printer 1, the keys 30 and 40 themselves are downsized in order to reduce the size of the entire device, and the keys 30 and 40 are operated as described above in order to improve space efficiency. The unit 106 is centrally arranged at one place. For this reason, as shown in FIG. 7A, when the feed key 40 is depressed, the operator's finger F may accidentally touch the adjacent power key 30. At this time, as described above, the operation of the power key 30 requires a larger pressing force than the feed key 40, and the power key 30 is difficult to be pressed down, so that erroneous operation of the power key 30 can be suppressed. Yes.

  On the other hand, as shown in FIG. 7 (b), when the operator depresses the power key 30, a greater force is required as compared with the feed key 40. Need to push down. For this reason, the possibility of touching the adjacent feed key 40 is reduced. In this way, erroneous operation between the power key 30 and the feed key 40 arranged adjacent to each other can be prevented.

  With reference to FIG. 8, the control contents related to the operation of the power key 30 and the feed key 40 executed by the CPU 12 in the power-on state of the portable printer 1 will be described.

  In step S10, the CPU 12 determines whether or not the feed key 40 has been pressed. If the feed key 40 is not depressed, the determination is not satisfied and the routine goes to Step S20. In step S20, the CPU 12 determines whether or not the power key 30 has been pressed. If the power key 30 has not been depressed, the determination is not satisfied and the routine returns to step S10.

  If the feed key 40 is depressed in step S10, the determination is satisfied and the routine goes to step S30. In step S <b> 30, the CPU 12 determines whether the power key 30 is pressed simultaneously with the feed key 40. If the power key 30 is not depressed at the same time, the determination is not satisfied and the routine goes to Step S40, where the CPU 12 outputs a control signal to the motor drive circuit 16 to drive the drive motor 11 and rotate the platen roller 111. Then, the above-described feed process for conveying the printing paper S by a predetermined amount is executed. Then, the process returns to step S10.

  On the other hand, if the power key 30 is depressed at the same time in step S30, the determination is satisfied and the process proceeds to step S50, where the CPU 12 outputs a control signal to the power circuit 15 and turns off the power of the portable printer 1. The power-off process is executed. Even when the power key 30 is depressed in step S20, the CPU 12 determines that the determination is satisfied, moves to step S50, and similarly executes the power-off process. And this flowchart is complete | finished.

  By the above control, step S10 and step S20 are repeated while the operator does not operate either the power key 30 or the feed key 40. At this time, if the power key 30 is operated alone, the determination in step S20 is satisfied, the process proceeds to step S50, and the power-off process is executed. On the other hand, when the feed key 40 is operated alone, the determination at Step S10 is satisfied, and the determination at Step S30 is not satisfied, and the routine goes to Step S40, where the feed process is executed.

  If the power key 30 and the feed key 40 are operated at the same time, both the determinations in step S10 and step S30 are satisfied and the process proceeds to step S50, and the power-off process is performed without performing the feed process. . As described above, the processing is executed with priority given to the power key 30 in the state where the pressing force larger than that of the feed key 40 is necessary for the operation of the power key 30 as described above. Are simultaneously depressed, it is considered that a large depressing force is applied to the power key 30. In this case, the operator can assume that the key has been depressed with the intention of operating the power key 30. It is. Therefore, by performing the above control, it is possible to perform processing suitable for the operator's intention.

  Next, the fixing structure of the guide member 120 described above will be described with reference to FIGS. 9 to 13. In the following description, when referring to the front, rear, left, right, and up and down directions, the parts such as the guide member 120 correspond to the respective directions when the portable printer 1 is attached.

  As shown in FIG. 9, the portable printer 1 is roughly assembled by assembling a top cover 101, an under cover 102, a cover member 103 and a chassis assembly 50 that constitute the housing 100. The chassis assembly 50 includes a main chassis member 150 that is provided on the inner surface of the under cover 102 and constitutes a bottom portion of the chassis assembly 50, and a pair of erected from both longitudinal ends of the main chassis member 150. Side chassis members 130L and 130R are provided. The side chassis members 130L and 130R support the platen roller 111 rotatably by inserting the shaft member 111a of the platen roller 111 into the shaft hole 131. Further, the side chassis members 130L and 130R support the heat radiating plate 114 including the thermal line head 112 so as to be rotatable via the shaft member 113 described above.

  The left side chassis member 130L includes the drive motor 11 that drives the platen roller 111, and a gear mechanism 132 that includes a plurality of gears that transmits the driving force of the drive motor 11 to the shaft member 111a of the platen roller 111. Is provided.

  A beam member 140 is bridged over the side chassis members 130L and 130R and fixed with screws. The above-described guide member 120 that guides the printing paper S inserted from the insertion port 104 to the pressure contact portion P between the platen roller 111 and the thermal line head 112 includes a top cover 101, an under cover 102, and a housing 100. The cover member 103 is separated from the cover member 103 and fixed to the beam member 140 so as to be provided on the side chassis members 130L and 130R.

  As shown in FIGS. 10 and 11, the guide member 120 includes a horizontal surface 121 that is substantially horizontal when assembled to the chassis assembly 50, and an inclined surface 122 that is inclined from the horizontal surface 121 toward the inside of the apparatus. And have. On the horizontal surface 121 and the inclined surface 122, a plurality of protrusion members 123 formed along the guide direction of the printing paper S are provided in parallel in the longitudinal direction. The guide member 120 has rib portions 124 and 125 erected downward on both sides of the lower portion of the horizontal surface 121 in the front-rear direction. Due to the rib portions 124 and 125 and the horizontal surface 121, the rear side of the guide member 120 has a substantially U-shaped side sectional shape with the lower side open, and the beam member 140 is covered with the portion. It is attached (see FIG. 13 described later).

  The rib portion 124 has a plurality of longitudinal positions (five positions in this example) at corresponding positions on the front side (the lower left side in FIG. 10 and the upper left side in FIG. 11) that is one side in the short direction of the beam member 140. A fixed claw member 126 that can be engaged with a plurality of (five in this example) engagement holes 141 is provided so as to protrude rearward (lower right side in FIG. 11). These fixed claw members 126 are formed in the same shape. On the other hand, at one place in the longitudinal direction of the rib portion 125, the rib member 125 is locked to a locking portion 142 provided at a corresponding position on the rear side (lower right side in FIG. 11) that is the other side in the short direction. A possible hook-shaped hook member 127 is provided. As a result, the guide member 120 engages the hook member 127 with the engagement portion 142 on the rear side of the beam member 140 in a state where the fixed claw member 126 is engaged with the engagement hole 141 on the front side of the beam member 140. The beam member 140 can be fixed by being sandwiched between the fixing claw member 126 and the hook member 127 from both sides in the front-rear direction (see FIG. 13 described later). Here, the locking portion 142 and the hook member 127 locked to the locking portion 142 are provided at one location in the longitudinal direction of the beam member 140 and the guide member 120, respectively, but may be provided at a plurality of locations.

  Of the five engagement holes 141 provided in the beam member 140, one engagement hole 141 (hereinafter referred to as “positioning hole 143” as appropriate) positioned at the center in the longitudinal direction is shown in FIG. ) And FIG. 12B, the vertical dimension is smaller than the other engagement holes 141. The vertical dimension of the positioning hole 143 is substantially the same as the vertical dimension of the fixed claw member 126. Thus, when the fixed claw member 126 of the guide member 120 is engaged with the engagement hole 141 of the beam member 140, the position of the guide member 120 in the vertical direction can be positioned by the positioning hole 143. Here, one of the engagement holes 141 is the positioning hole 143, but a plurality of engagement holes 141 may be the positioning holes 143.

  As shown in FIG. 13, the thermal line head 112 has a resin raised portion 116 (see also FIG. 9) for protecting a semiconductor element that drives a heating element on the surface. Here, the conveyance path R of the printing paper S is a path from the insertion port 104 to the discharge port 107 through the inclined surface 122 of the guide member 120 and the pressure contact portion P between the Latin roller 111 and the thermal line head 112. . That is, the transport path R is mainly defined by the relative positional relationship of the guide member 120 with respect to the platen roller 111 and the thermal line head 112. The positioning of the guide member 120 in the vertical direction by the positioning hole 143 of the beam member 140 is set in consideration of the conveyance path R so as to avoid the raised portion 116. Further, in the state where the guide member 120 is fixed to the beam member 140 as described above, the angle of the inclined surface 122 is set so that the transport path R can avoid the raised portion 116. As a result, it is possible to prevent problems such as hindering insertion from the insertion port 104 and paper jams due to the printing paper S coming into contact with the raised portions 116 of the thermal line head 112 in the transport path R. ing.

  Next, the urging structure of the heat sink 114 by the coil spring 115 provided on the main chassis member 150 will be described with reference to FIGS. In FIG. 14, the control board 60 is indicated by an imaginary line to prevent complexity.

  As shown in FIGS. 2 and 9 described above, a metal main chassis member 150 constituting the bottom of the chassis assembly 50 is provided on the inner surface of the under cover 102. As shown in FIG. 14, the main chassis member 150 includes a front rib portion 151 having a substantially L-shaped cross section that is bent upward along the longitudinal direction at an end portion on the front side (left upper side in FIG. 14). ing. Further, the main chassis member 150 includes a rear rib portion 152 having a substantially L-shaped cross section that is bent upward along the longitudinal direction at the rear end (lower right side in FIG. 14). . The front rib portion 151 is formed by bending the front end portion of the main chassis member 150 over the entire longitudinal direction, and the rear rib portion 152 is the center side in the longitudinal direction of the rear end portion of the main chassis member 150. It is formed by bending a part of. Further, the length in the vertical direction of the front rib portion 151 is configured to be longer than that of the rear rib portion 152.

  The front rib portion 151 has a first left side fixing portion 153 fixed to the left side chassis member 130L at the left end portion (right end portion in FIG. 14), which is one end side in the longitudinal direction, and the other end side in the longitudinal direction. The first right side fixing part 154 fixed to the right side chassis member 130R is provided at the right end part (left end part in FIG. 14). These fixing portions 153 and 154 are formed by bending both longitudinal ends of the front rib portion 151 to the rear side along the surface direction of the side chassis members 130L and 130R.

  Further, a second left side fixing portion 158 used for fixing to the side chassis member 130L is provided behind the left end portion of the main chassis member 150, and a hook-like shape used for fixing the side chassis member 130R is provided behind the right end portion. The second right fixing portion 159 is formed to bend upward.

  The main chassis member 150 includes a plurality of (three in this example) that urge the heat sink 114 to rotate toward the platen roller 111 at a plurality of locations in the longitudinal direction (three in this example) in the vicinity of the front rib portion 151. ) Coil spring 115 is provided. These coil springs 115 are supported so as to stand up stably by being inserted through spring support shafts 155 (see FIG. 2) protruding from corresponding positions of the main chassis member 150. The coil springs 115 are provided at equal intervals at three locations in the longitudinal direction of the main chassis member 150, and the first coil springs 115 C provided corresponding to the longitudinal center positions of the thermal line head 112 and the first coil springs. It is composed of two second coil springs 115L and 115R located on the left and right sides of 115c. In the present specification, when it is not necessary to distinguish the coil springs 115C, 115L, and 115R, they are simply referred to as “coil springs 115”.

  The spring constant of the first coil spring 115C is larger than the spring constant of the second coil springs 115L and 115R. As shown in the sheet alignment position display M formed on the surface of the top cover 101 (see FIGS. 1 and 9), the portable printer 1 conveys the printing sheet S with reference to the center position in the apparatus longitudinal direction. Since the printer performs printing, the thermal line head 112 is urged by the first coil spring 115C having the largest spring constant at the center position in the longitudinal direction serving as a reference, and the second coil springs 115L and 115R having small spring constants on both sides thereof. By energizing, even if the size of the printing paper S is changed, the pressure contact load of the thermal line head 112 acts in a balanced manner in the longitudinal direction and is stabilized.

  As shown in FIGS. 2 and 14, in the portable printer 1, a control board 60 on which electronic elements are mounted is provided between the main chassis member 150 and the heat sink 114 that supports the thermal line head 112. It has been. A plurality (three in this example) of attachments are formed by cutting and raising the control board 60 from the main chassis member 150 so as to be sandwiched between the front rib portion 151 and the rear rib portion 152 described above. The part 156 is attached by screws (not shown). A plurality of (three in this example) concave portions 61 for inserting the coil springs 115 are provided at positions corresponding to the coil springs 115 at the periphery of the control board 60.

  As shown in FIG. 15, a concave spring receiving portion 117 is provided at a position corresponding to the coil spring 115 on the lower surface 114a of the heat radiating plate 114 opposite to the thermal line head 112 side. The spring receiving portion 117 has a contact surface 117a in contact with the upper end portion of the coil spring 115 at the bottom, and the surface direction X of the heat radiating plate 114 rotates around the shaft member 113 as shown in FIG. Even when the posture is not perpendicular to the axial direction Y of the coil spring 115 by the operation, the contact surface 117 a is provided so as to be substantially perpendicular to the axial direction X. As a result, each coil spring 115 can make the urging force act stably on the heat radiating plate 114 by bringing the upper end portion into contact with the contact surface 117 a of the corresponding spring receiving portion 117.

  Further, as shown in FIG. 16, the spring receiving portion 117 is provided at the front side (left side in FIG. 16) end portion which is the other end portion in the short side direction of the heat radiating plate 114. That is, the coil spring 115 is configured to urge the heat radiating plate 114 toward the platen roller 111 in front of the position of the pressure contact portion P between the thermal line head 112 and the platen roller 111. Accordingly, the necessary biasing force can be reduced compared with the case where the heat sink 114 is energized at the middle position between the rear end portion and the front end portion, particularly at the rear side of the press contact portion P. The size is reduced.

  Next, a structure for fixing the side chassis member 130 and the main chassis member 150 will be described with reference to FIGS. 17 and 18. 17 and 18, the guide member 120 is not shown.

  As shown in FIGS. 17 and 18, convex portions 133 are respectively provided at two locations in the front-rear direction at the base end portions that are the lower end portions of the side chassis members 130 </ b> L and 130 </ b> R. These convex portions 133 are formed in order to provide engagement holes 134 described later at the base end portions of the side chassis members 130L and 130R. In addition, when the under cover 102 and the chassis assembly 50 are assembled, these convex portions 133 are respectively accommodated in the concave portions 108 (see FIG. 9) provided on the inner surface of the under cover 102.

  The protrusions 133 of the side chassis members 130 </ b> L and 130 </ b> R are respectively formed with engagement holes 134 for engaging protrusions 157 provided at both ends in the longitudinal direction of the main chassis member 150. Each protrusion 157 engages with the corresponding engagement hole 134, whereby the base end portions of the side chassis members 130 </ b> L and 130 </ b> R are positioned at both longitudinal end positions of the main chassis member 150.

  The side chassis members 130L and 130R are respectively provided with screw holes 135 through which a plurality of (three in this example) screws 118 for fastening are inserted. Each screw 118 is inserted into the screw hole 135 of the side chassis members 130L and 130R, and the first left side fixing portion 153 and the first right side fixing portion 154 of the front side rib portion 151, and both longitudinal ends of the beam member 140 The second left side fixing part 158 and the second right side fixing part 159 provided behind the main chassis member 150 are respectively fastened. Thereby, the side chassis members 130 </ b> L and 130 </ b> R are fixed to the main chassis member 150. The chassis assembly 50 configured as described above is assembled to the under cover 102 while the convex portions 133 of the side chassis members 130L and 130R are accommodated in the concave portions 108 of the under cover 102, respectively.

  As a result, the side chassis members 130 </ b> L and 130 </ b> R are positioned at both ends in the longitudinal direction of the main chassis member 150 by the protrusions 157 of the main chassis member 150, and the front ribs 151 of the main chassis member 150. Thus, the left side chassis member 130 </ b> L and the right side chassis member 130 </ b> R are connected at an intermediate position between the base end portion and the installation portion of the platen roller 111 or the thermal line head 112.

  Next, a buffer structure of the chassis assembly 50 in the portable printer 1 will be described with reference to FIGS.

  As shown in FIG. 20, on the inner side of the top cover 101, first boss portions 161L and 161R protruding toward the inner side of the apparatus are provided at both ends in the width direction on the rear side (upper right side in FIG. 20). Yes. Screw grooves (not shown) are formed on the inner peripheral surfaces of the first boss portions 161L and 161R. On the other hand, as shown in FIG. 19, on the inner side of the under cover 101, there are second boss portions 162L and 162R protruding slightly toward the inside of the device at both ends in the width direction on the rear side (lower left side in FIG. 19). Is provided.

  As shown in FIG. 19, the chassis assembly 50 includes mounting portions 51 and 52 in which screw holes 51 a and 52 a (see FIG. 21) are formed at both ends in the width direction on the rear side. The mounting portion 51 is formed by bending the rear side of the base end portion of the side chassis member 130L toward the outer side in the width direction (lower right side in FIG. 19). The mounting portion 52 is integrally provided on the right rear side of the main chassis member 150. An annular rubber member 53 is provided on the upper portions of the mounting portions 51 and 52, respectively.

  The first boss portions 161L and 161R of the top cover 101, the mounting portions 51 and 52 of the chassis assembly 50, the rubber members 53 and 53 provided on the upper portions of the mounting portions 51 and 52, respectively, The two boss portions 162L and 162R are provided at corresponding positions in the vertical direction. The top cover 101, the under cover 102, and the chassis assembly 50 include screws (not shown) inserted from the second boss portions 162L and 162R of the under cover 102 and screws of the mounting portions 51 and 52 of the chassis assembly 50. The holes 51a and 52a and the rubber members 53 and 53 are inserted and fastened to the first boss portions 161L and 161R of the top cover 101 to be assembled with each other.

  When the top cover 101 and the under cover 102 and the chassis assembly 50 are assembled in this way, the mounting portions 51 and 52 of the chassis assembly 50 are connected to the first boss portions 161L and 161R of the top cover 101 and the under cover 102. Between the second boss portions 162L and 162R. At this time, the chassis assembly 50 and the under cover 102 are in contact with each other at the attachment portions 51 and 52 and the second boss portions 162L and 162R, but the base end portion of the side chassis member 130 described above is the inside of the under cover 102. There is no contact with the surface. On the other hand, only the attachment portions 51 and 52 and the first boss portions 161L and 161R are in indirect contact with the chassis assembly 50 and the top cover 101 via a rubber member 53 provided therebetween. Thereby, the impact transmitted from the top cover 101 to the chassis assembly 50 can be effectively absorbed by the rubber member 53.

  Further, the top cover 101 supports the first boss portions 161L and 161R so as to absorb the impact transmitted from the cover to the first boss portions 161L and 161R (only the boss support member 163R in FIG. 20). (Shown). As shown in FIG. 20, the boss support member 163R includes a standing portion 164R that is erected from the back surface of the top cover 101 toward the inside of the apparatus, and a bent portion that is bent from the standing portion 164R. 165R, and the first boss portion 161R is provided on the bent portion 165R. The boss support member 163L has the same structure as the boss support member 163R. With such a structure, the boss support members 163L and 163R receive an impact transmitted from the top cover 101 to the first boss portions 161L and 161R due to the deflection generated between the standing portions 164L and 164R and the bent portions 165L and 165R. It can be absorbed.

  Further, as shown in FIG. 20, the top cover 101 has a predetermined amount around the first boss portions 161L and 161R toward the inside of the apparatus (upper side in FIG. 20) than the tip portions of the first boss portions 161L and 161R. The protruding rib portions 166L and 166R are provided. The rib portion 166L is disposed on the outer side in the width direction of the first boss portion 161L (the lower right side in FIG. 20, the right side in FIG. 21), and the rib portion 166R is the rear side of the first boss portion 161R ( The upper right side in FIG. In FIG. 21, only the rib portion 166L is shown based on the cross-sectional direction. The rib portions 166L, 166R come into contact with the mounting portions 51, 52 of the chassis assembly 50 when the top cover 101 and the under cover 102 and the chassis assembly 50 are assembled, and the first boss portions 161L, The movement of 161R toward the attachment portions 51 and 52 is restricted. Thereby, it is possible to prevent the compression amount of the rubber member 53 from becoming excessive, and to prevent the shock absorbing function and durability of the rubber member 53 from being lowered.

  Next, the structure of the battery chamber cover 170 that can be attached to and detached from the battery storage chamber 105 will be described with reference to FIGS.

  As described above, the battery chamber cover 170 is provided so as to be detachable from the battery storage chamber 105. As shown in FIG. 22, when the battery chamber cover 170 is removed, the battery that houses the rechargeable battery 10 is installed. A storage chamber 105 opens in the rear portion of the housing 100.

  The battery chamber cover 170 is provided at the left end (right end in FIGS. 22 to 25) that is one end in the longitudinal direction, and at the left end that is one end in the longitudinal direction of the battery storage chamber 105. It has a pair of upper and lower locking claws 171 fitted in the hole 109 (see FIG. 23). Further, the battery chamber cover 170 is provided at a right end portion (left end portion in FIGS. 22 to 25) that is the other end portion in the longitudinal direction and a right end portion that is the other end portion in the longitudinal direction of the battery storage chamber 105. It has an elastic engagement part 172 that engages with the joint part 110 while being elastically deformed. When attaching the battery chamber cover 170 to the battery storage chamber 105, first, the locking claw 171 at the left end is fitted into the locking hole 109 of the battery storage chamber 105 to lock the left end, In this state, the elastic engagement portion 172 is elastically deformed by pushing the right end portion into the battery storage chamber 105 and is engaged with the engaged portion 110 of the battery storage chamber 105. As a result, the battery chamber cover 170 is attached to the battery storage chamber 105 as shown in FIG.

  On the other hand, when removing the battery chamber cover 170 from the battery storage chamber 105, an operator inserts a finger into the engaged portion 110 formed in a concave shape to elastically deform the elastic engaging portion 172, The engagement between the elastic engagement portion 172 and the engaged portion 110 is released. Then, by pulling out the locking claw portion 171 from the locking hole 109 of the battery storage chamber 105, the battery chamber cover 170 is removed from the battery storage chamber 105.

  As shown in FIGS. 24 and 25, the elastic engagement portion 172 has a support portion 173 erected from the inner surface 170 a of the battery chamber cover 170 toward the battery storage chamber 105, and a tip of the support portion 173. A curved portion 174 is provided, and a distal end portion 175 that can be brought into contact with and separated from the support portion 173 by the bending of the curved portion 174. A projecting portion 175 a is formed at the distal end portion 175, and the projecting portion 175 a is engaged with the engaged portion 110 of the battery storage chamber 105.

  A rib portion 176 is erected on the inner surface 170 a of the battery chamber cover 170 adjacent to the support portion 173 of the elastic engagement portion 172. The rib portion 176 has a hollow structure with a substantially U-shaped cross section whose open side is connected to the support portion 173. As shown in FIG. 23, the rib portion 176 functions as a harness push-in portion that pushes in the electric wire 25a of the harness 25 connected to the rechargeable battery 10 stored when the battery chamber cover 170 is attached to the battery storage chamber 105. To do. That is, the rechargeable battery 10 is connected to a harness 25 for supplying power to the device at the right end (left end in FIG. 23) which is the other side end when stored in the battery storage chamber 105. . The harness 25 includes a connector 25b connected to the control board 60 and the like, and a plurality (two in this example) of electric wires 25a collected in a bundle. The electric wire 25a is formed long with a margin in consideration of the attachment / detachment workability at the time of battery replacement. Therefore, as shown in FIG. 23, when the rechargeable battery 10 is stored in the battery storage chamber 105, the rechargeable battery 10 is folded in the battery storage chamber 105. The rib portion 176 can push the folded portion of the folded electric wire 25a into the back of the storage chamber and prevent the folded portion from interfering with the elastic engagement portion 172.

  In the above, the protrusion 157 of the main chassis member 150 corresponds to the positioning means described in the claims, and the front rib portion 151 corresponds to the side chassis connection portion and the rib portion. The first left fixing portion 153 corresponds to a first fixing portion, and the first right fixing portion 154 corresponds to a second fixing portion.

  In the portable printer 1 of the present embodiment described above, the following effects can be obtained. That is, in a general portable printer, the platen roller and the thermal line head (including the heat sink) supported by the side chassis member include metal objects in their constituent elements. It is a relatively heavy part. For this reason, when the portable printer receives a strong impact due to dropping or the like, the pair of side chassis members are deformed so as to open each other due to the inertia of the heavy object, and the platen roller and the thermal line head are detached from the side chassis members. There is a fear.

  In the present embodiment, the base end portions of the side chassis members 130L and 130R are positioned at both longitudinal end positions of the main chassis member 150 by the protrusions 157 provided at both longitudinal ends of the main chassis member 150, and the main chassis member 150 The front side rib portion 151 of the left side chassis member 130L and the right side chassis member 130R are positioned at the intermediate position between the base end portion of the side chassis members 130L and 130R and the installation portion of the platen roller 111 or the thermal line head 112 by the front rib portion 151. And connect. Accordingly, the side chassis members 130L and 130R are fixed so that the distance between the base end portions thereof is the length of the main chassis member 150 in the longitudinal direction, and the base end portion and the platen roller 111 or the thermal position, which is the upper position thereof, are fixed. The distance at the intermediate position from the installation portion of the line head 112 is also fixed by the front rib portion 151 so as to be the length of the main chassis member 150 in the longitudinal direction.

  In this manner, the distance between the side chassis members 130L and 130R can be fixed at the base end portion and two positions in the vertical direction above the base end portion, so that the portable printer 1 receives a strong impact due to dropping or the like as described above. Even in this case, the pair of side chassis members 130L and 130R can be prevented from being deformed so as to be opened by the inertia of heavy objects such as the platen roller 111 and the thermal line head 112. As a result, the platen roller 111 and the thermal line head 112 can be prevented from being detached from the side chassis members 130L and 130R, so that a portable printer that is resistant to impacts such as when dropped is realized. Further, since the main chassis member 150 is integrally provided with the protruding portion 157 and the front rib portion 151, there is no need to separately provide a member for positioning and connecting the side chassis members 130L and 130R. The score can be reduced.

  In the present embodiment, in particular, the front rib portion 151 having an L-shaped cross section formed by bending the front end side of the main chassis member 150 along the longitudinal direction toward the arrangement side of the platen roller 111 and the thermal line head 112. Thus, the left side chassis member 130L and the right side chassis member 130R are connected to each other. That is, since the side chassis members 130L and 130R can be connected only by bending the main chassis member 150, manufacturing is facilitated and the structure of the portable printer 1 can be simplified. Furthermore, by forming the front rib portion 151 on the main chassis member 150, the strength of the main chassis member 150 itself can be increased, and the portable printer 1 has a structure that is stronger against impacts such as when dropped. Can do.

  Further, in the present embodiment, in particular, the first left side fixing portion 153 and the first right side fixing portion are bent by bending both longitudinal end portions of the front rib portion 151 along the surface direction of the side chassis members 130L and 130R. A portion 154 is formed. As a result, the first left fixing portion 153 and the first right fixing portion 154 can be made substantially parallel to the surface direction of the side chassis members 130L and 130R. , 130R can be fixed firmly and stably.

  In the present embodiment, in particular, the protrusions 157 provided at both ends in the longitudinal direction of the main chassis member 150 are engaged with the engagement holes 134 provided at the base end portions of the side chassis members 130L and 130R. The base end portions of the chassis members 130L and 130R are positioned at both end positions in the longitudinal direction of the main chassis member 150. With such a structure, the base end portions of the side chassis members 130 </ b> L and 130 </ b> R can be easily positioned with simple structures at both longitudinal end positions of the main chassis member 150.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order.

(1) When giving priority to the feed key when operated at the same time In the above embodiment, when the power key 30 and the feed key 40 are operated at the same time, the power key 30 is given priority for processing. However, the feed key 40 may be prioritized.

  With reference to FIG. 26, the control contents relating to the operation of the power key 30 and the feed key 40 executed by the CPU 12 in this modification will be described.

  Steps S10, S20 and S50 are the same as those in FIG. That is, while the operator does not operate either the power key 30 or the feed key 40, Step S10 and Step S20 are repeated. At this time, if the power key 30 is operated alone, the determination in step S20 is satisfied, the process proceeds to step S50, and the power-off process is executed.

  On the other hand, when the feed key 40 is operated while Step S10 and Step S20 are repeated, the process proceeds to Step S30, and the CPU 12 determines whether the power key 30 is pressed together with the feed key 40 or not. . At this time, regardless of whether the power key 30 is simultaneously depressed or not depressed, the process proceeds to step S40, and the CPU 12 executes the feed process. Then, the process returns to step S10.

  As described above, in this modification, when the power key 30 and the feed key 40 are operated at the same time, the feed process is performed without executing the power-off process. In this way, by executing the processing with priority on the feed key 40, when the operator operates the feed key 40, the power key 30 is mistakenly given a larger pressing force, and the power key 30 and the feed key are given. Even if 40 is depressed simultaneously, the feed process is executed, so that the function of suppressing the erroneous operation of the power key 30 can be further enhanced.

(2) When the power key is a double-click operation In the above-described embodiment, the power key 30 and the feed key 40 are operated by a single depression. The power-off process may be performed by assuming that the operation has been performed only when the button is continuously depressed twice within the time.

  With reference to FIG. 27, the control contents relating to the operation of the power key 30 and the feed key 40 executed by the CPU 12 in this modification will be described.

  About step S10 and step S20, it is the same as that of above-mentioned FIG. 8, and while the operator does not operate both the power key 30 and the feed key 40, step S10 and step S20 are repeated. At this time, if the power key 30 is operated alone, the determination in step S20 is satisfied, and the process proceeds to step S25.

  In step S <b> 25, the CPU 12 determines whether or not the power key 30 has been continuously pressed down twice within a predetermined time (hereinafter referred to as “double click”). If the power key 30 has not been double-clicked, the determination is not satisfied and the routine returns to step S10. On the other hand, if the power key 30 is double-clicked, the determination is satisfied and the routine goes to Step S50, where the CPU 12 executes a power-off process. Then, this flow ends.

  On the other hand, if the feed key 40 is operated while Step S10 and Step S20 (or Steps S10 to S30) are repeated, the determination at Step S10 is satisfied and the routine goes to Step S30, where the CPU 12 40, it is determined whether or not the power key 30 is simultaneously depressed. If the power key 30 is not depressed at the same time, the determination is not satisfied and the routine goes to Step S40, and the CPU 12 executes the feed process. Then, the process returns to step S10. On the other hand, if the power key 30 is pressed down simultaneously, the determination is not satisfied and the routine goes to Step S35.

  In step S35, the CPU 12 determines whether or not the power key 30 has been double-clicked. If the power key 30 is double-clicked, the determination is satisfied and the routine goes to Step S50, where the power-off process is executed. On the other hand, if the power key 30 has not been double-clicked, the determination is not satisfied and the routine goes to Step S40, where the CPU 12 executes the feed process. Then, the process returns to step S10.

  As described above, in this modification, only when the power key 30 is double-clicked, the power-off process is performed assuming that the power key 30 has been pressed. As a result, when the operator operates the feed key 40 by mistake, a large pressing force is applied to the power key 30 and even if the power key 30 and the feed key 40 are pressed simultaneously, If there is, the power supply is not turned off and the feed process corresponding to the feed key 40 is executed, so that the function of suppressing the erroneous operation of the power key 30 can be further enhanced. Further, since the operation of the power key 30 needs to be pressed twice in this way, the power key 30 is erroneously operated by a contact object or the like other than when the feed key 40 is operated, for example, when the portable printer 1 is carried. There is also an effect that can be prevented.

(3) When the rubber member 53 is also provided on the under cover 102 side In the above embodiment, the rubber member 53 is provided between the first boss portions 161L and 161R of the top cover 101 and the mounting portions 51 and 52. The rubber member 53 may also be provided between the second boss portions 162L and 162R of the under cover 102 and the attachment portions 51 and 52. Thereby, even if any of the top cover 101 and the under cover 102 receives an impact due to a drop of the portable printer 1 or the like, the impact transmitted to the chassis assembly 50 can be absorbed with certainty. A more powerful portable printer can be realized.

(4) Others In the above, the arrows shown in FIG. 3 show an example of the signal flow, and do not limit the signal flow direction. Further, the flowcharts shown in FIGS. 8, 26 and 27 do not limit the present invention to the procedure shown in the above flow, and the addition / deletion of the procedure or the order of the procedures are within the scope not departing from the gist and technical idea of the invention. Changes may be made.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Portable printer 100 Housing 101 Top cover 102 Under cover 111 Platen roller 112 Thermal line head 130L Side chassis member 130R Side chassis member 134 Engagement hole 150 Main chassis member 151 Front side rib part (side chassis connection part, rib part)
153 First left side fixing part (first fixing part)
154 First right side fixing part (second fixing part)
157 Protrusion (positioning means)
S Printing paper

Claims (4)

A portable printer that performs desired printing on a printing paper,
A platen roller for conveying the printing paper;
A thermal line head for performing desired printing on the printing paper conveyed by the platen roller;
A pair of side chassis members that rotatably support the platen roller and support the thermal line head so as to be in press contact with the platen roller;
A housing having a top cover constituting the upper part of the device outer shell and an under cover constituting the lower part of the device outer shell;
A main chassis member provided on an inner surface of the under cover, wherein the side chassis member is erected from both longitudinal ends;
The main chassis member is
Positioning means for positioning the base end portion of the side chassis member at both longitudinal positions of the main chassis member;
A side chassis connecting part that connects the side chassis member on one side and the side chassis member on the other side at an intermediate position between the base end part of the side chassis member and the installation part of the platen roller or the thermal line head. And a portable printer. The portable printer according to claim 1, wherein
The side chassis connecting portion is
The main chassis member is a rib portion having an L-shaped cross section that is bent along the longitudinal direction toward one side in the short direction of the main chassis member toward the arrangement side of the platen roller and the thermal line head. Portable printer. The portable printer according to claim 2, wherein
The rib portion is
A first fixing portion fixed to the one side chassis member is provided on one end side in the longitudinal direction, and a second fixing portion fixed to the other side chassis member is provided on the other end side in the longitudinal direction. ,
The portable printer, wherein the first fixing portion and the second fixing portion are formed by bending both longitudinal ends of the rib portion along the surface direction of the side chassis member. The portable printer according to any one of claims 1 to 3,
The positioning means includes
Protrusions provided at both longitudinal ends of the main chassis member,
The protrusion is
A portable type wherein the base end portion of the side chassis member is positioned at both longitudinal end positions of the main chassis member by engaging with an engagement hole provided in the base end portion of the side chassis member. Printer.

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