Printing device

Abstract

To solve the problem in which: it has been difficult to downsize printing apparatuses.SOLUTION: A printing apparatus includes: a container section that can accommodate roll paper made of rolled recording paper; a cover for opening and closing the container section; a transport section, including a transport motor and a transport roller, the transport section configured to pull the recording paper from the roll paper and transport it; a printing section that performs printing on the recording paper at a position facing the transport roller; a first substrate that has a control section for controlling the printing section; and a second substrate disposed to intersect the first substrate. The transport motor is surrounded by the first substrate, the second substrate, and the container section, and a shaft of the transport motor is disposed parallel to a shaft of the transport roller.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a printing apparatus.

Background Art

[0002] Conventionally, as shown in Patent Document 1, there is known a printing apparatus in which a motor for conveying a recording paper is disposed outside a frame.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the printing apparatus described in Patent Document 1, it is necessary to newly provide a space for disposing a motor for conveying a recording paper outside a frame or the like, and it has been difficult to miniaturize the printing apparatus.

Means for Solving the Problems

[0005] The printing apparatus includes a storage unit capable of storing a roll paper around which a recording paper is wound, a cover for opening or closing the storage unit, a conveyance unit including a conveyance motor and a conveyance roller for pulling out and conveying the recording paper from the roll paper, a printing unit for performing printing on the recording paper at a position facing the conveyance roller, a first substrate on which a control unit for controlling the printing unit is mounted, and a second substrate disposed so as to intersect the first substrate. The conveyance motor is surrounded by the first substrate, the second substrate, and the storage unit, and the axis of the conveyance motor is disposed along the axis of the conveyance roller.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0007] 1. Embodiment Hereinafter, the embodiment will be described with reference to the drawings. The directions in the drawings will be described using a three-dimensional coordinate system in which the X-axis, Y-axis, and Z-axis are orthogonal to each other. For convenience of explanation, the positive direction of the Z-axis is referred to as the upward direction or simply up, the negative direction is referred to as the downward direction or simply down, the positive direction of the X-axis is referred to as the right direction or simply right, the negative direction is referred to as the left direction or simply left, the positive direction of the Y-axis is referred to as the rear direction or simply rear, and the negative direction is referred to as the front direction or simply front.

[0008] The printing apparatus 1 according to the embodiment is used, for example, in a POS (Point Of Sale) system. The POS system is a system used in businesses such as retail businesses such as shopping centers, department stores, convenience stores, in-vehicle sales, etc., and food and beverage businesses such as restaurants, cafes, izakayas, etc. The POS system has functions such as accounting according to the goods and services purchased by the customer and issuing a receipt according to the accounting. When staff at stores such as retail and food and beverage businesses need to issue a receipt or the like during accounting, they operate the POS system, transmit print data from the computer to the printing apparatus 1, and the printing apparatus 1 issues a receipt and hands it to the customer. The printing apparatus 1 is installed at a counter where accounting is performed within the store. Since the installation location of the counter is limited, the printing apparatus 1 is also required to be miniaturized.

[0009] 1-1. Configuration of the Printing Apparatus As shown in Fig. 1, the printing apparatus 1 includes a control unit 10, a storage unit 11, a printing unit 20, a conveyance unit 30, a cutting unit 40, a communication unit 12, and a power supply unit 13. The configuration of the printing apparatus 1 will be described with reference to Figs. 2 to 6 as well.

[0010] As shown in Fig. 2, the cover 51 is attached to the case 54 so as to be rotatable about the hinge 52. The storage unit 50 can accommodate the roll paper R around which the recording paper P is wound. By rotating, the cover 51 can move between a state where the storage unit 50 is open and a state where the storage unit 50 is closed. Fig. 2 shows a state where the cover 51 has opened the storage unit 50. In the following description, the cover 51 opening the storage unit 50 is also referred to as the cover 51 opening. Note that Fig. 3 shows a state where the cover 51 has closed the storage unit 50. In the following description, the cover 51 closing the storage unit 50 is also referred to as the cover 51 closing.

[0011] The components related to the mechanism mounted on the case 54 include the fixed blade 41 which is the second blade included in the cutting unit 40, the printing unit 20 including the head 21, the conveyance motor 31 included in the conveyance unit 30, the storage unit 50, and the like. Note that as shown in Fig. 6, the conveyance unit 30 includes a conveyance motor 31, a wheel train 38, and conveyance rollers 35. Also, on the case 54, a main board 60 which is the first board and a sub-board 61 which is the second board are provided.

[0012] The main board 60 mounts at least the control unit 10 which will be described later for controlling the printing unit 20. The sub-board 61 mounts at least the communication unit 12 and the power supply unit 13 which will be described later. The main board 60 and the sub-board 61 are connected to each other by an internal connector. The internal connector is, for example, of a type that connects the boards in a vertical posture. By using such an internal connector, the main board 60 and the sub-board 61 are arranged so as to cross each other.

[0013] As shown in FIG. 2, the periphery of the conveyance motor 31 is surrounded by the main board 60 from above the printing apparatus 1, surrounded by the sub-board 61 from the rear direction of the printing apparatus 1, and surrounded by the accommodating portion 50 from the front and downward directions.

[0014] The case 54 has a rectangular parallelepiped shape so as to reduce the space where the printing apparatus 1 is installed on the counter in the store. Further, the accommodating portion 50 has an arc shape along the shape of the roll paper R in order to accommodate the roll paper R. In the printing apparatus 1, a so-called dead space, which is an empty space where no other components are arranged, is likely to occur between the arc-shaped accommodating portion 50 and the side of the rectangular parallelepiped-shaped case 54.

[0015] Specifically, a particularly large dead space occurs near the printing unit 20, between the portion of the arc-shaped accommodating portion 50 and the rear and upper side of the case 54. As shown in FIG. 2, when the main board 60, the sub-board 61, and the conveyance motor 31 are arranged in this dead space, the space efficiency in the printing apparatus 1 is improved. In particular, since there is no need to newly provide a space for arranging the conveyance motor 31 in the printing apparatus 1, the printing apparatus 1 can be made smaller.

[0016] Incidentally, the conveyance motor 31 has a cylindrical shape with the conveyance motor shaft 32 as the center of the circle. As shown in FIG. 2, the cylindrical conveyance motor 31 is arranged in the dead space in such a posture that the portion corresponding to the outer periphery of the cylinder is surrounded by the main board 60, the sub-board 61, and the accommodating portion 50. Also, this dead space extends in the left-right direction within the printing apparatus 1. The conveyance motor 31 is arranged in such a posture that the conveyance motor shaft 32 protruding from the conveyance motor 31 extends along the left-right direction of this dead space. In other words, the conveyance motor 31 is arranged in such a posture that the direction corresponding to the height of the cylindrical shape of the conveyance motor 31 extends along the left-right direction of this dead space. As a result, the conveying motor 31 including the conveying motor shaft 32 can be efficiently arranged in accordance with the space extending also in the left - right direction of this dead space, and can be made smaller.

[0017] In this way, in the empty space in the printing apparatus 1, the dead space where no other components are arranged, the main board 60, the sub - board 61, and the housing portion 50 are efficiently arranged so as to surround the cylindrical conveying motor 31. In order to secure a space for arranging the conveying motor 31, it is not necessary to enlarge the printing apparatus 1, and the printing apparatus 1 can be made smaller. Furthermore, even if the size of the conveying motor 31 is to be increased, in accordance with the dead space, the conveying motor 31 can be enlarged in the diameter direction of the cylindrical shape, and since the dead space also extends in the left - right direction, it can be enlarged in the axial direction of the conveying motor shaft 32. Thus, there is freedom in the size of the conveying motor 31 arranged in the dead space.

[0018] Note that the roll paper R is also cylindrical. At the center of the circle of the cylindrical shape of the roll paper R, there is a core made of paper or plastic resin. In the height direction of the cylindrical shape of the roll paper R stored in the housing portion 50, the direction of the axis of the core of the roll paper R is also a direction parallel to the conveying motor shaft 32 of the conveying motor 31. As a result, the roll paper R, the housing portion 50 for storing the roll paper R, and the conveying motor 31 can suppress wasted space and can be efficiently arranged.

[0019] On the other hand, the components related to the mechanism mounted on the cover 51 include the conveying roller 35 included in the conveying portion 30, the movable blade 42 which is the first blade included in the cutting portion 40, the cutter motor 43 for moving the movable blade 42, the guide 53 capable of regulating the roll paper R, and the like. As shown in FIGS. 2 and 3, a conveyance motor shaft 32, which is the axis of the rotation center of the conveyance motor 31, is arranged to be parallel to a conveyance roller shaft 36, which is the axis of the rotation center of the conveyance roller 35. By making the conveyance motor 31 and the conveyance roller 35 parallel along their respective axes, wasted space can be suppressed, and they can be arranged in the printing apparatus 1 with good space efficiency. Furthermore, the printing apparatus 1 can be made smaller.

[0020] In addition, in FIGS. 2 and 3, an example is shown in which the printing apparatus 1 is installed in a posture such that the cover 51 is located on the front surface of the printing apparatus 1. However, it is also possible to install the printing apparatus 1 in a posture such that the cover 51 is located on the upper surface. According to these postures of the printing apparatus 1, a discharge port 55, which will be described later and is formed by the cover 51, is located on the front surface or the upper surface of the printing apparatus 1. Therefore, it is easy for the store staff to take the recording paper P that is printed and discharged from the discharge port 55.

[0021] FIG. 3 shows a state in which the cover 51 closes the accommodating portion 50. At this time, the conveyance roller 35 of the conveyance portion 30 provided on the cover 51 is in a position facing the head 21 of the printing portion 20 provided on the case 54. In this way, when the cover 51 closes, the head 21 is in a position where it can print on the recording paper P. Also, as will be described later, the pinion train 38 and the conveyance roller gear 37 of the conveyance roller 35 are engaged with each other, and torque can be transmitted from the conveyance motor 31 to the conveyance roller 35. In this way, when the cover 51 closes, the conveyance roller 35 is in a position where it can convey the recording paper P. The store staff opens the cover 51, accommodates the roll paper R in the accommodating portion 50, and closes and sets the cover 51.

[0022] The printing portion 20 includes a pressing mechanism that presses the head 21 toward the conveyance roller 35. The recording paper P is sandwiched between the head 21 and the conveyance roller 35 by the pressing mechanism with a predetermined pressing force. When the conveyance roller 35 rotates clockwise by the conveyance motor 31, the recording paper P sandwiched between the head 21 and the conveyance roller 35 is pulled out from the roll paper R and conveyed. Note that the transport roller 35 is made of a flexible material such as silicone rubber. The transport roller 35 can generate a frictional force that sandwiches the recording paper P together with the head 21 and transports the recording paper P.

[0023] As shown in FIG. 3, at the separation position S, the recording paper P is separated from the roll paper R by the transport roller 35. The portion of the housing 50 corresponding to the separation position S and capable of regulating the recording paper P or the roll paper R is defined as the portion E of the housing 50. The portion E is also part of the housing 50 that can surround the transport motor 31 together with the main substrate 60 and the sub-substrate 61. Also, the portion E is located in the closest range to the transport motor 31 within the housing 50.

[0024] Note that when the recording paper P is pulled out from the roll paper R, the roll paper R may roll in the front-rear direction. The guide 53 provided on the cover 51 is also in an arc shape along the shape of the roll paper R, similar to the housing 50. The housing 50 and the guide 53 regulate the roll paper R in the front-rear direction and suppress its rolling.

[0025] The head 21 of the printing unit 20 is, for example, a line thermal head in which a plurality of heating elements are arranged in a line. When the control unit 10 receives print data through the communication unit 12, it selects heating elements from the plurality of heating elements of the head 21 based on the print data and applies a driving voltage to cause them to generate heat. The recording paper P is thermal paper. The recording paper P develops color due to the heat generation of the heating elements, and printing according to the print data is performed. Note that since the head 21 is a line thermal head, the recording paper P is printed by the head 21 while being transported by the transport roller 35.

[0026] As shown in FIG. 3, when the cover 51 is closed, the movable blade 42 of the cutting portion 40 provided on the cover 51 is in a position facing the fixed blade 41 provided on the case 54 and can rub against each other. Also, when the cover 51 is in the closed state, a rectangular discharge port 55 is formed at the end of the cover 51 on the opposite side of the hinge 52 and at the boundary of the case 54 at a position facing the end of the cover 51.

[0027] The fixed blade 41 is made of a rectangular parallelepiped-shaped metal, and the tip of any side serves as the cutting edge. The movable blade 42 is made of, for example, V-shaped metal, and the tip of the V shape serves as the cutting edge. Under the control of the control unit 10, the movable blade 42 is moved by the cutter motor 43 of the cutting unit 40. The movable blade 42 is of the so-called punching type, where it moves with its V-shaped cutting edge toward the fixed blade 41. The movable blade 42 and the fixed blade 41 can cut the recording paper P from both ends while rubbing their cutting edges against each other. The recording paper P is printed by the printing unit 20, cut by the cutting unit 40, and discharged from the discharge port 55.

[0028] Note that the movable blade 42 may also be made of a rectangular parallelepiped-shaped metal with the tip of any side serving as the cutting edge. In this case, the movable blade 42 is of the so-called scissor type, where it is rotatably supported around a support shaft provided on the cover 51. By the cutter motor 43, the movable blade 42 rotates around the support shaft, moves relative to the fixed blade 41 from one end of the cutting edge of the movable blade 42 to the other end, and can cut the recording paper P while rubbing against the fixed blade 41.

[0029] By the way, when the cover 51 is in the closed state, the sub-board 61 is arranged to face the cover 51 with the housing portion 50 in between. In other words, when the cover 51 is in the closed state, at least part E of the housing portion 50 is sandwiched, with the cover 51 on one side and the sub-board 61 on the other side.

[0030] As a result, when the cover 51 is in the closed state, the surface of the sub-board 61 is arranged to face the surface of the cover 51 on the opposite side of the position of the cover 51 sandwiching the housing portion 50. Since the sub-board 61 is arranged in parallel with the closed cover 51, the conveyance motor 31 can be efficiently arranged in the space between the sub-board 61 and the closed cover 51, and the printing device 1 can be made smaller.

[0031] The control unit 10 shown in FIG. 1 includes a CPU (Central Processing Unit) that comprehensively controls each part of the printing device 1, a UART (Universal Asynchronous Receiver Transmitter) that manages input / output, an FPGA (Field Programmable Gate Array) and a PLD (Programmable Logic Device) which are logic circuits, etc. The CPU is also called a processor. The storage unit 11 includes a flash ROM (Read Only Memory) which is a rewritable non-volatile memory, an HDD (Hard Disk Drive), a RAM (Random Access Memory) which is a volatile memory, etc. The CPU of the control unit 10 reads programs such as firmware stored in the non-volatile memory of the storage unit 11 and executes them using the RAM of the storage unit 11 as a working area.

[0032] As shown in FIG. 4, the printing unit 20 includes a head 21, a head substrate 22, and an FFC (Flexible Flat Cable) 23. Specifically, the head 21 is mounted on a head substrate 22 made of ceramic or the like. The head 21 and the main board 60 are connected by a cable such as an FFC 23. When the communication unit 12 receives print data from a computer of a POS system or the like, the control unit 10 on the main board 60 generates a control signal for controlling the head 21 and applies it to the head 21 via the FFC 23. The head 21 prints a receipt on the recording paper P based on the applied control signal.

[0033] The power supply unit 13 inputs AC power or DC power from the outside and generates a driving voltage, such as 24V, to supply power to actuators such as the head 21 of the printing unit 20, the conveyance motor 31 of the conveyance unit 30, and the cutter motor 43 of the cutting unit 40. Also, the power supply unit 13 generates a logic voltage, such as 3.3V, to supply power to circuits such as the control unit 10, the memory unit 11, and the communication unit 12.

[0034] The external connectors of the communication unit 12 and the power supply unit 13 may be large connectors, and a large space may be required for installation. For example, the external connector may be larger than the internal connector that connects the main board 60 and the sub-board 61. Comparing the space around the main board 60 and the space around the sub-board 61, the latter has less components such as the printing unit 20 and the FFC 23 nearby, and fewer components of the printing apparatus 1, so it is easier to obtain a space for installing the external connector. Therefore, by mounting the communication unit 12 and the power supply unit 13 on the sub-board 61, the printing apparatus 1 can be made smaller.

[0035] As described above, since the communication unit 12 and the power supply unit 13 are mounted on the sub-board 61, a plurality of cables extend outward from the plurality of external connectors. These plurality of cables must be wired so as not to interfere with the counter where the printing apparatus 1 is installed. For this reason, it is preferable to collectively arrange the external connectors to which the plurality of cables are connected on the opposite side of the discharge port 55, that is, on the opposite side of the cover 51, in the printing apparatus 1. In other words, the sub-board 61 on which the communication unit 12 and the power supply unit 13 are mounted is preferably located on the opposite side of the cover 51 in the printing apparatus 1 and arranged to face the closed cover 51. With such an arrangement, the space where the printing apparatus 1 is installed can be reduced, including the wiring of the plurality of cables.

[0036] As described above, the control unit 10 transmits a control signal for controlling the head 21 of the printing unit 20 via the FFC 23. In the printing apparatus 1, reducing the space for routing the FFC 23 can make the printing apparatus 1 smaller. Therefore, it is preferable to arrange the control unit 10 near the head 21 to shorten the FFC 23. The main board 60 is arranged to surround the conveyance motor 31 together with the sub-board 61 and the housing portion 50, and is located closer to the head 21 than the sub-board 61. For this reason, it is preferable to mount the control unit 10 on the main board 60 instead of the sub-board 61. As a result, the FFC 23 can be shortened, so that the space for routing the FFC 23 can be reduced, and the printing apparatus 1 can be made smaller.

[0037] Further, the control signal includes a high-frequency signal such as 4 MHz, for example. As the FFC 23 becomes longer, the control signal is more likely to attenuate, and high-frequency noise is more likely to propagate from the FFC 23 to other components. From such a viewpoint as well, it is preferable to arrange the control unit 10 near the head 21 to shorten the FFC 23. Also, the storage unit 11 in which the control unit 10 reads and writes information is preferably located near the control unit 10. Therefore, it is preferable to mount the control unit 10 and the storage unit 11 on the main board 60.

[0038] The conveyance motor 31 of the conveyance unit 30 is, for example, a DC (Direct Current) motor which is a DC motor. As shown in FIG. 5, an encoder 34 for detecting the rotation of the conveyance motor 31 is provided on the conveyance motor shaft 32 of the conveyance motor 31. The encoder 34 is a so-called rotary encoder. The encoder 34 includes a disk which is a scale with slits opened at predetermined intervals, and a transmissive photosensor for detecting the slits of the disk. The disk is attached to the conveyance motor shaft 32 and rotates together with the conveyance motor shaft 32. A pulse signal having a width corresponding to the rotation of the conveyance motor 31 is output from the photosensor that has detected the slits of the rotating disk.

[0039] The control unit 10 inputs a pulse signal from the encoder 34, calculates the speed of the conveyance motor 31, and performs PWM (Pulse Width Modulation) control on the conveyance motor 31 so as to rotate it at a predetermined speed. Specifically, the control unit 10 feeds back the rotational speed of the conveyance motor 31 acquired from the pulse signal of the encoder 34, adjusts the on and off times of the drive voltage applied to the conveyance motor 31, and can control it to reach the target rotational speed.

[0040] As shown in FIG. 5, the encoder 34 is provided on the right on the conveyance motor shaft 32 of the conveyance motor 31. As a result, the encoder 34 can also be arranged together with the conveyance motor 31 in the dead space, which is the empty space in the printing apparatus 1 surrounded by the main substrate 60, the sub-substrate 61, and the housing portion 50. Specifically, in accordance with the dead space extending left and right in the printing apparatus 1, the encoder 34 is also arranged in the direction of the conveyance motor shaft 32 of the conveyance motor 31, so that the printing apparatus 1 can be made smaller.

[0041] As shown in FIG. 5, a conveyance motor gear 33 is provided on the left of the conveyance motor shaft 32 of the conveyance motor 31. Also, as shown in FIG. 6, a gear train 38 is provided on the side of the conveyance motor 31 opposite to the side where the encoder 34 is provided. The gear train 38 meshes with the conveyance motor gear 33 and transmits the torque of the conveyance motor 31 to the conveyance roller 35. The gear train 38 is composed of a plurality of gears and transmits the torque to the conveyance roller 35 while reducing the rotational speed of the conveyance motor 31.

[0042] The conveyance roller gear 37 of the conveyance roller 35 is also arranged in the left space in the printing apparatus 1. The gear train 38 meshes with the conveyance roller gear 37 and rotates the conveyance roller 35 clockwise. As shown in FIG. 6, the conveyance motor gear 33 of the conveyance motor 31, the wheel train 38, and the conveyance roller gear 37 of the conveyance roller 35 are included in the conveyance unit 30 and are efficiently arranged in the left space within the printing apparatus 1 respectively. As a result, the printing apparatus 1 can be made smaller further.

[0043] According to the embodiment described above, the main board 60, the sub-board 61, and the housing unit 50 can be arranged so as to surround the conveyance motor 31 in the empty space within the printing apparatus 1 where no other components are arranged, i.e., the dead space. As a result, there is no need to newly expand the space for arranging the conveyance motor 31, and the printing apparatus 1 can be made smaller. Furthermore, the conveyance motor shaft 32 of the conveyance motor 31 is arranged so as to be parallel to the conveyance roller shaft 36 of the conveyance roller 35. The conveyance motor 31 and the conveyance roller 35 can be efficiently arranged in parallel respectively, suppressing the dead space and making the printing apparatus 1 smaller further.

[0044] Although these embodiments have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and may be changed, replaced, deleted, etc. without departing from the gist of the present invention.

[0045] As described above, the head 21 of the printing apparatus 1 has been described by way of example of a line thermal head, but the type of the head 21 is not limited. For example, the head 21 may be a line type inkjet head. The recording paper P has been described by way of example of thermal paper, but when the head 21 is an inkjet head, it may be plain paper. Further, the recording paper P may be label paper with a shaped label attached to a backing sheet. The printing device 1 can be a label issuing device installed in a store. In this case, a photosensor for detecting the position of the label attached to the backing sheet may be provided at a position downstream of the separation position S in the conveyance direction of the recording paper P. For example, when the photosensor is a reflection type, the light emitting part and the light receiving part may be mounted on either the guide 53 of the cover 51 or the housing part 50 at that position. Alternatively, when the photosensor is a transmission type, the light emitting part and the light receiving part may be separately mounted on the guide 53 of the cover 51 and the housing part 50, respectively. Also, the cutting part 40 may not be provided. Instead of the cutting part 40, a peeling mechanism for peeling the label from the backing sheet may be provided at the discharge port 55. Although the conveyance motor 31 has been described as an example of a DC motor, other types such as a stepper motor may be used. Also, although the conveyance motor 31 has been described as having a cylindrical shape, it may have other shapes. As long as the conveyance motor 31 has a shape that can be arranged in the dead space surrounded by the main board 60, the sub-board 61, and the housing part 50. Also, the encoder 34 may be of other detection methods such as a tachogenerator. Although an example of a gear train 38 using a plurality of gears has been described as transmitting the torque of the conveyance motor 31 to the conveyance roller 35, the torque may be transmitted by a belt. Although the head 21 and the main board 60 are connected by the FFC 23, an FPC (Flexible printed circuits), a flat cable, or the like may be used.

Explanation of reference numerals

[0046] 1... Printing device, 10... Control unit, 11... Storage unit, 12... Communication unit, 13... Power supply unit, 20... Printing unit, 21... Head, 23... FFC, 30... Conveyance unit, 31... Conveyance motor, 32... Conveyance motor shaft, 34... Encoder, 35... Conveyance roller, 36... Conveyance roller shaft, 38... Gear train, 50... Housing part, 51... Cover, 60... Main board, 61... Sub-board, P... Recording paper, R... Roll paper.

Claims

1. A housing portion capable of housing a roll paper around which a recording paper is wound, A cover for opening or closing the housing portion, A conveyance unit including a conveyance motor and conveyance rollers, for pulling out and conveying the recording paper from the roll paper And a printing unit that performs printing on the recording paper at a position facing the conveyance rollers, A first substrate mounted with a control unit for controlling the printing unit, A second substrate arranged so as to intersect with the first substrate, and comprising: The second substrate is arranged so as to face the cover at a position closing the housing portion with the housing portion interposed therebetween. The first substrate is arranged above the conveyance motor and connected to the printing unit arranged forward by an FFC. The conveyance motor is arranged on the rear side of the first substrate and above the second substrate. The conveyance motor is surrounded by the first substrate, the second substrate, and the housing portion, and the axis of the conveyance motor is arranged along the axis of the conveyance rollers. A printing apparatus.

2. The conveyance motor is a DC motor, and an encoder for detecting rotation is provided on the axis of the conveyance motor. The printing apparatus according to Claim 1.

3. A gear train for transmitting the torque of the conveyance motor to the conveyance rollers is provided on the side opposite to the side where the encoder is provided in the conveyance motor. The printing apparatus according to Claim 2.

4. A communication unit capable of receiving print data, and a power supply unit for supplying power to the conveyance unit and the printing unit. The communication unit and the power supply unit are mounted on the second substrate. The printing apparatus according to any one of Claims 1 to 3.

5. A first external connector and a second external connector, wherein the first external connector is connected to the power supply unit, and the second external connector is connected to the communication unit. The first external connector and the second external connector are arranged in a space facing the cover at a position closing the housing portion with the housing portion interposed therebetween. The printing apparatus according to Claim 4.

6. A housing portion capable of housing a roll paper around which a recording paper is wound, A cover for opening or closing the housing portion, A conveyance unit including a conveyance motor and conveyance rollers, for pulling out and conveying the recording paper from the roll paper And a printing unit that performs printing on the recording paper at a position facing the conveyance rollers, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A first substrate equipped with a control unit for controlling the printing unit; A second substrate arranged so as to intersect the first substrate; and The second substrate is arranged to face the cover at the position where the accommodating portion is closed, with the accommodating portion therebetween; Arranged to face each other; The first substrate is arranged above the conveying motor and connected to the printing unit arranged forward by an FFC; Connected to the printing unit arranged forward by an FFC; The conveying motor is arranged on the rear side of the first substrate and on the upper side of the second substrate; And is arranged; The conveying motor is arranged in a space surrounded by the first substrate, the second substrate, and the accommodating portion; And is arranged; The first substrate, the second substrate, and the accommodating portion respectively form different side surfaces of the space; Forming; The axis of the conveying motor is arranged along the axis of the conveying roller. A printing apparatus Apparatus.

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