Printing apparatus

Abstract

A printing apparatus includes: a receiving section capable of receiving a roll of paper wound with recording paper; a cover for opening or closing the receiving section; a conveying section including a conveying motor and a conveying roller, and for conveying the recording paper by pulling it out of the roll of paper; a printing section for printing on the recording paper at a position opposite to the conveying roller; a first substrate on which a control section for controlling the printing section is mounted; and a second substrate configured to intersect with the first substrate, wherein the conveying motor is configured to be surrounded by the first substrate, the second substrate and the receiving section, and the axis of the conveying motor is along the axis of the conveying roller.

Description

Technical Field

[0001] This disclosure relates to printing apparatus. Background Technology

[0002] In the prior art, as shown in Patent Document 1, there are known printing devices in which the motor for feeding the recording paper is arranged on the outside of the frame.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-119117

[0004] However, in the printing apparatus described in Patent Document 1, a new space is required on the outside of the frame or elsewhere to accommodate the motor that transports the recording paper, making it difficult to miniaturize the printing apparatus. Summary of the Invention

[0005] The printing apparatus includes: a receiving section capable of receiving a roll of paper wound with recording paper; a cover for opening or closing the receiving section; a conveying section including a conveying motor and a conveying roller, the conveying section pulling the recording paper out of the roll of paper for conveying; a printing section for printing on the recording paper at a position opposite to the conveying roller; a first substrate on which a control section for controlling the printing section is mounted; and a second substrate configured to intersect with the first substrate, the conveying motor being surrounded by the first substrate, the second substrate and the receiving section, the axis of the conveying motor being configured along the axis of the conveying roller. Attached Figure Description

[0006] Figure 1 This is a block diagram showing the configuration of a printing apparatus.

[0007] Figure 2 This is a cross-sectional view showing the configuration of the printing device when the cover is opened to receive the device.

[0008] Figure 3 This is a cross-sectional view showing the configuration of the printing device when the cover is closed and the receiving part is in place.

[0009] Figure 4 This is a schematic diagram of the printing department.

[0010] Figure 5 This is a schematic diagram showing the conveyor motor as the center.

[0011] Figure 6 This is a diagram showing the transmission of torque from the conveyor motor to the conveyor roller. Detailed Implementation

[0012] 1. Implementation Method

[0013] The implementation method will now be described with reference to the accompanying drawings. It should be noted that a three-dimensional coordinate system in which the X, Y, and Z axes are orthogonal to each other is used to explain the directions in the figures. For ease of explanation, the positive direction of the Z-axis will be referred to as "up" or simply "up," and the negative direction will be referred to as "down" or simply "down." The positive direction of the X-axis will be referred to as "right" or simply "right," and the negative direction will be referred to as "left" or simply "left." The positive direction of the Y-axis will be referred to as "back" or simply "back," and the negative direction will be referred to as "forward" or simply "forward."

[0014] The printing apparatus 1 involved in the implementation method is used, for example, in a POS (Point of Sale) system. A POS system is used in retail businesses such as shopping malls, department stores, convenience stores, and mobile sales, as well as in food and beverage businesses such as restaurants, eateries, and izakayas. A POS system has the function of settling accounts based on the goods and services purchased by customers and issuing receipts based on the settlement.

[0015] When shop assistants in retail, catering, and other businesses need to issue receipts during checkout, they will operate the POS system to send printing data from the computer to the printing device 1, which will then issue the receipt and hand it to the customer.

[0016] The printing device 1 is installed at the checkout counter inside the store. Due to space constraints at the counter, the printing device 1 also needs to be miniaturized.

[0017] 1-1. Composition of a printing apparatus

[0018] like Figure 1 As shown, the printing apparatus 1 is configured to include a control unit 10, a storage unit 11, a printing unit 20, a transport unit 30, a cutting unit 40, a communication unit 12, and a power supply unit 13. See also... Figures 2-6 The configuration of printing apparatus 1 will be described.

[0019] like Figure 2 As shown, the cover 51 is mounted on the housing 54 in a manner that allows it to rotate around the hinge 52. The receiving portion 50 is capable of accommodating a roll of paper R wound with recording paper P. The cover 51 can be moved between an open receiving portion 50 state and a closed receiving portion 50 state by rotation.

[0020] Figure 2 The diagram shows the state where the cover 51 is open to receive the portion 50. In the following description, the cover 51 being open to receive the portion 50 will also be referred to as the open cover 51.

[0021] It should be pointed out that, Figure 3 The state of the cover 51 with the receiving portion 50 closed is shown. In the following description, the cover 51 with the receiving portion 50 closed will also be referred to as the closed cover 51.

[0022] Components associated with the mechanism mounted on the housing 54 include a fixed blade 41, which serves as a second blade, included in the cutting section 40; a printing section 20, which includes a head 21; a conveying motor 31, included in the conveying section 30; and a receiving section 50.

[0023] It should be pointed out that, such as Figure 6 As shown, the conveying unit 30 is configured to include a conveying motor 31, a wheel system 38, and a conveying roller 35.

[0024] In addition, a main substrate 60 serving as a first substrate and a sub-substrate 61 serving as a second substrate are provided in the housing 54.

[0025] The main substrate 60 is equipped with at least the control unit 10, which is described later, for controlling the printed circuit board 20. The sub-substrate 61 is equipped with at least the communication unit 12 and the power supply unit 13, which are described later.

[0026] The main substrate 60 and the sub-substrate 61 are connected to each other via an internal connector. The internal connector is, for example, a connector that connects the substrates to each other in a vertical orientation. By using such an internal connector, the main substrate 60 and the sub-substrate 61 are arranged in a cross-shaped configuration.

[0027] like Figure 2 As shown, the conveyor motor 31 is surrounded by the main substrate 60 from above the printing device 1, by the sub-substrate 61 from the rear of the printing device 1, and by the receiving portion 50 from the front and below.

[0028] To reduce the space required for the printing device 1 to be installed on the counter in the shop, the housing 54 is rectangular. In addition, the receiving part 50 is an arc shape that follows the shape of the roll of paper R in order to accommodate the roll of paper R.

[0029] Within the printing apparatus 1, space without other components, i.e., ineffective space, can easily be generated between the arc-shaped receiving portion 50 and the cuboid-shaped housing 54.

[0030] Specifically, near the printing section 20, a particularly large ineffective space is generated between the arc-shaped receiving section 50 and the rear and upper edge of the housing 54.

[0031] like Figure 2 As shown, if the main substrate 60, sub-substrate 61, and transport motor 31 are arranged in the inefficient space, the space efficiency within the printing apparatus 1 is improved. In particular, there is no need to create new space within the printing apparatus 1 for arranging the transport motor 31, thus enabling the printing apparatus 1 to be made smaller.

[0032] Next, the conveyor motor 31 is cylindrical with the conveyor motor shaft 32 as its center. For example... Figure 2As shown, the cylindrical conveyor motor 31 is positioned in the unused space in a posture in which the portion corresponding to the outer periphery of its cylinder is surrounded by the main substrate 60, the sub-sub substrate 61, and the receiving portion 50.

[0033] Furthermore, this unused space extends to the left and right sides within the printing apparatus 1. The conveyor motor 31 is configured such that the conveyor motor shaft 32, protruding from the conveyor motor 31, extends to the left and right sides of this unused space. In other words, the conveyor motor 31 is configured such that it extends to the left and right sides of this unused space in a direction corresponding to the height of the cylindrical shape of the conveyor motor 31.

[0034] As a result, the conveyor motor 31, which also includes the conveyor motor shaft 32, can be configured efficiently in conjunction with the space that extends to the left and right sides of the ineffective space, and can be further miniaturized.

[0035] In this way, the main substrate 60, the sub-substrate 61, and the receiving portion 50 are each efficiently arranged in a way that surrounds the cylindrical transport motor 31 in the empty space within the printing apparatus 1 where no other components are placed. This eliminates the need to increase the size of the printing apparatus 1 to ensure space for the transport motor 31, allowing the printing apparatus 1 to be made smaller.

[0036] Furthermore, even if it is desired to increase the size of the conveyor motor 31, the conveyor motor 31 can be increased in the diameter direction of the cylindrical shape, corresponding to the unused space. Moreover, since the unused space also expands to the left and right, it can also be increased in the axial direction of the conveyor motor shaft 32. In this way, the size of the conveyor motor 31 arranged in the unused space has a degree of freedom.

[0037] It should be noted that the roll of paper R is also cylindrical. At the center of the cylindrical shape of the roll of paper R is a core made of paper and plastic resin. The height direction of the cylindrical shape of the roll of paper R housed in the receiving section 50, i.e., the direction of the axis of the core of the roll of paper R, is also parallel to the direction of the conveyor motor shaft 32 of the conveyor motor 31. As a result, unnecessary space can be minimized, and the layout can be highly efficient, including the roll of paper R, the receiving section 50 housing the roll of paper R, and the conveyor motor 31.

[0038] On the other hand, the components related to the mechanism mounted on the cover 51 include: the conveying roller 35 included in the conveying section 30, the movable blade 42 included in the cutting section 40 as the first blade, the cutter motor 43 that moves the movable blade 42, and the guide 53 that can limit the roll paper R, etc.

[0039] like Figure 2 and Figure 3As shown, the conveyor motor shaft 32, which serves as the rotation center of the conveyor motor 31, is arranged in parallel along the conveyor roller shaft 36, which serves as the rotation center of the conveyor roller 35. In other words, the conveyor motor shaft 32 is arranged along the direction of the conveyor roller shaft 36. By arranging the conveyor motor 31 and the conveyor roller 35 in parallel along their respective axes, unnecessary space can be suppressed, allowing for efficient space arrangement within the printing apparatus 1, and further miniaturizing the printing apparatus 1.

[0040] It should be pointed out that, in Figure 2 and Figure 3 The example shown is of the printing device 1 with the cover 51 located on the front surface of the printing device 1. However, the printing device 1 can also be arranged with the cover 51 located on the upper surface. Depending on the arrangement of these printing devices 1, the discharge port 55 formed by the cover 51 (described later) is located on the front or upper surface of the printing device 1, so that the shop clerk can easily pick up the printing paper P that has been printed and discharged from the discharge port 55.

[0041] Figure 3 The diagram shows the state where the cover 51 is closed and the receiving portion 50 is closed. At this time, the conveyor roller 35 of the conveyor portion 30 provided on the cover 51 is positioned opposite the head 21 of the printing portion 20 provided on the housing 54. Thus, when the cover 51 is closed, the head 21 is positioned where printing can be performed on the recording paper P.

[0042] Furthermore, as described later, the gear train 38 meshes with the conveyor roller gear 37 of the conveyor roller 35, enabling the transmission of torque from the conveyor motor 31 to the conveyor roller 35. Thus, when the cover 51 is closed, the conveyor roller 35 is positioned to convey the recording paper P.

[0043] The shop clerk opens the cover 51 to accommodate the roll of paper R in the receiving section 50 and then closes the cover 51 to place it.

[0044] The printing section 20 is equipped with a pressing mechanism that faces the pressing head 21 toward the conveyor roller 35. The pressing mechanism clamps the recording paper P between the head 21 and the conveyor roller 35 with a specified pressing force. When the conveyor roller 35 is rotated clockwise by the conveyor motor 31, the recording paper P clamped between the head 21 and the conveyor roller 35 is pulled out from the paper roll R and conveyed.

[0045] It should be noted that the conveyor roller 35 is made of a flexible material such as silicone rubber. The conveyor roller 35 can clamp the recording paper P together with the head 21 and generate a frictional force that can convey the recording paper P.

[0046] like Figure 3 As shown, at the pull-out position S, the recording paper P is pulled away from the roll paper R by the conveyor roller 35.

[0047] The portion of the receiving section 50 that can restrict the recording paper P or the roll paper R corresponding to the pull-out position S is designated as portion E of the receiving section 50. Portion E is also a part of the receiving section 50 that can surround the transport motor 31 together with the main substrate 60 and the sub-sub substrate 61.

[0048] Furthermore, part E is located within the housing 50 and is closest to the conveyor motor 31.

[0049] It should be noted that when the recording paper P is pulled out of the roll of paper R, the roll of paper R may sometimes roll in the back-and-forth direction. The guide 53 provided on the cover 51 is also arc-shaped, following the shape of the roll of paper R, just like the receiving part 50. Through the receiving part 50 and the guide 53, the roll of paper R is restricted in the back-and-forth direction, suppressing its rolling.

[0050] The head 21 of the printing unit 20 is, for example, a row-type thermal head in which multiple heating elements are arranged in a linear pattern. When printing data is received through the communication unit 12, the control unit 10 selects a heating element from the multiple heating elements of the head 21 based on the printing data and applies a driving voltage to make it heat up.

[0051] The recording paper P is thermal paper. The recording paper P develops color through heating by a heating element, allowing printing to proceed in accordance with the printed data.

[0052] It should be noted that since head 21 is a line-type thermal head, the edge of the recording paper P is conveyed by the conveyor roller 35 and printed by head 21.

[0053] like Figure 3 As shown, when the cover 51 is closed, the movable blade 42 of the cutting portion 40 provided on the cover 51 is positioned opposite to the fixed blade 41 provided on the housing 54, and they can rub against each other.

[0054] Furthermore, when the cover 51 is closed, a rectangular outlet 55 is formed at the boundary of the housing 54 at the end of the cover 51 opposite to the hinge 52 and at the position opposite to the end of the cover 51.

[0055] The fixed blade 41 is made of a cuboid-shaped metal, with the tip of any one of its sides serving as the blade tip. The movable blade 42 is, for example, made of a V-shaped metal, with the V-shaped tip serving as the blade tip.

[0056] 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 a so-called piercing blade that moves its V-shaped blade tip toward the fixed blade 41. The movable blade 42 and the fixed blade 41 can cut the recording paper P from both ends while the blade tips rub against each other.

[0057] The recording paper P is printed by the printing section 20 and cut by the cutting section 40 and discharged from the discharge port 55.

[0058] It should be noted that the movable blade 42 can also be made of cuboid-shaped metal, with the tip of any one side serving as the blade point. In this case, the movable blade 42 is a so-called scissor-like blade supported so as to be able to rotate around the pivot of the cover 51. Through the cutter motor 43, the movable blade 42 can rotate around the pivot and move relative to the fixed blade 41 from one end of the blade point to the other, cutting the recording paper P while rubbing against the fixed blade 41.

[0059] Next, when the cover 51 is closed, the sub-substrate 61 is positioned opposite the cover 51 across the receiving portion 50. In other words, when the cover 51 is closed, the cover 51 is located on one side and the sub-substrate 61 is positioned on the other side across at least a portion E of the receiving portion 50.

[0060] As a result, when the cover 51 is closed, the surface of the sub-substrate 61 is positioned opposite to the cover 51 on the side opposite to the position of the receiving portion 50.

[0061] The sub-board 61 and the closed cover 51 are arranged in parallel, so the transport motor 31 can be efficiently arranged in the space between the sub-board 61 and the closed cover 51, making the printing apparatus 1 smaller.

[0062] Figure 1 The control unit 10 shown is configured to include a CPU (Central Processing Unit) that comprehensively controls all parts of the printing apparatus 1, a UART (Universal Asynchronous Receiver Transmitter) that manages input and output, and FPGA (Field Programmable Gate Array) and PLD (Programmable Logic Device) as logic circuits. The CPU is also called a processor. The storage unit 11 is configured to include flash ROM (Read Only Memory) as rewritable non-volatile memory, HDD (Hard Disk Drive), and RAM (Random Access Memory) as volatile memory.

[0063] The CPU of the control unit 10 reads the firmware and other programs stored in the non-volatile memory of the storage unit 11 and uses the RAM of the storage unit 11 as the working area to execute them.

[0064] like Figure 4As shown, the printing section 20 is configured to include a head 21, a head substrate 22, and an FFC (Flexible Flat Cable) 23. Specifically, the head 21 is mounted on the head substrate 22, which is made of ceramic or the like. The head 21 is connected to the main substrate 60 via a cable such as the FFC 23.

[0065] When printing data is received from a computer or similar device in a POS system via the communication unit 12, the control unit 10 on the main board 60 generates a control signal for the control head 21 and applies it to the head 21 via the FFC 23. Based on the applied control signal, the head 21 prints a receipt on the recording paper P.

[0066] The power supply unit 13 receives AC or DC power from the outside and generates a drive voltage such as 24V to supply power to actuators such as the head 21 of the printing unit 20, the conveyor motor 31 of the conveying unit 30, and the cutter motor 43 of the cutting unit 40.

[0067] In addition, 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 storage unit 11, and the communication unit 12.

[0068] The external connectors for the communication unit 12 and the power supply unit 13 are sometimes large connectors, requiring a large space for installation. For example, the external connectors may be larger than the internal connectors connecting the main substrate 60 and the sub-substrate 61.

[0069] Comparing the space around the main substrate 60 with the space around the sub-substrate 61, the latter has fewer components, such as the printing section 20 and FFC 23, and thus easier access to space for mounting external connectors. Therefore, by mounting the communication section 12 and the power supply section 13 on the sub-substrate 61, the printing apparatus 1 can be further miniaturized.

[0070] As described above, since the communication unit 12 and the power supply unit 13 are mounted on the sub-board 61, multiple cables extend outward from multiple external connectors. These multiple cables must be wired in a manner that will not obstruct the counter where the printing device 1 is installed.

[0071] Therefore, it is preferable to centrally arrange the external connectors that connect to multiple cables in the printing apparatus 1 on the opposite side of the outlet 55, that is, on the opposite side of the cover 51. In other words, it is preferable that the sub-board 61, which is equipped with the communication unit 12 and the power supply unit 13, is located on the opposite side of the cover 51 in the printing apparatus 1 and is arranged opposite to the closed cover 51. If arranged in this way, the space required for the printing apparatus 1 can be reduced, including the wiring of multiple cables.

[0072] As described above, the control unit 10 sends control signals to the head 21 of the printing unit 20 via the FFC 23. Within the printing apparatus 1, reducing the space for routing the FFC 23 allows the printing apparatus 1 to be made smaller. Therefore, it is preferable to position the control unit 10 near the head 21 to shorten the FFC 23.

[0073] The main substrate 60 is configured to surround the transport motor 31 together with the sub-substrate 61 and the receiving portion 50, and is located closer to the head 21 than the sub-substrate 61. Therefore, it is preferable to mount the control unit 10 on the main substrate 60 instead of the sub-substrate 61. As a result, the FFC 23 can be shortened, so that the FFC 23 can be routed in a small space, and the printing apparatus 1 can be further miniaturized.

[0074] Furthermore, the control signals include high-frequency signals such as 4MHz. As the FFC23 becomes longer, the control signals are prone to attenuation, and high-frequency noise can easily propagate from the FFC23 to other components.

[0075] From this perspective, it is also preferable to position the control unit 10 near the head 21 to shorten the FFC 23. Furthermore, it is preferable that the storage unit 11 for reading and writing information by the control unit 10 is also located near the control unit 10. Therefore, it is preferable to mount the control unit 10 and the storage unit 11 on the main substrate 60.

[0076] The conveyor motor 31 of the conveyor unit 30 is, for example, a DC (Direct Current) motor. Figure 5 As shown, an encoder 34 for detecting the rotation of the conveyor motor 31 is provided on the conveyor motor shaft 32 of the conveyor motor 31.

[0077] The encoder 34 is a rotary encoder. The encoder 34 is configured to include a circular plate serving as a scale with slits spaced at predetermined intervals, and a transmissive photoelectric sensor that detects the slits of the circular plate. The circular plate is mounted on the conveyor motor shaft 32 and rotates together with it. The photoelectric sensor, which detects the rotation of the slits in the circular plate, outputs a pulse signal with a width corresponding to the rotation of the conveyor motor 31.

[0078] The control unit 10 inputs pulse signals from the encoder 34 and calculates the speed of the conveyor motor 31, and performs PWM (Pulse Width Modulation) control on the conveyor motor 31 to make it rotate at a specified speed.

[0079] Specifically, the control unit 10 receives the rotational speed of the conveyor motor 31 from the pulse signal obtained from the encoder 34, and adjusts the on and off times of the drive voltage applied to the conveyor motor 31, thereby controlling the target rotational speed.

[0080] like Figure 5 As shown, the encoder 34 is located on the right side of the conveyor motor shaft 32 of the conveyor motor 31. As a result, the encoder 34 can also be configured together with the conveyor motor 31 in the empty space, i.e., the inactive space, within the printing apparatus 1 surrounded by the main substrate 60, the sub-sub substrate 61, and the receiving portion 50.

[0081] Specifically, taking advantage of the unused space in the left and right expansion within the printing device 1, the encoder 34 is also positioned in the direction of the conveyor motor shaft 32 of the conveyor motor 31, thus enabling the printing device 1 to be further miniaturized.

[0082] like Figure 5 As shown, the conveyor motor gear 33 is located on the left side of the conveyor motor shaft 32 of the conveyor motor 31.

[0083] In addition, such as Figure 6 As shown, a gear train 38 is provided on the side of the conveyor motor 31 opposite to the side where the encoder 34 is located. The gear train 38 meshes with the conveyor motor gear 33, transmitting the torque of the conveyor motor 31 to the conveyor roller 35. The gear train 38 is composed of multiple gears, which simultaneously reduce the rotational speed of the conveyor motor 31 and transmit torque to the conveyor roller 35.

[0084] The conveyor roller gear 37 of the conveyor roller 35 is also located in the left space within the printing apparatus 1. The gear train 38 meshes with the conveyor roller gear 37, causing the conveyor roller 35 to rotate clockwise.

[0085] like Figure 6 As shown, the conveyor motor gear 33 of the conveyor motor 31, the gear train 38, and the conveyor roller gear 37 of the conveyor roller 35 are included in the conveying section 30 and are efficiently arranged in the left-side space of the printing apparatus 1. As a result, the printing apparatus 1 can be further miniaturized.

[0086] According to the embodiments described above, the main substrate 60, the sub-substrate 61, and the receiving portion 50 can be arranged to surround the transport motor 31 in the unused space within the printing apparatus 1 where no other components are placed. As a result, the printing apparatus 1 can be made smaller without expanding the space to make room for the transport motor 31.

[0087] Furthermore, the conveyor motor shaft 32 of the conveyor motor 31 is configured to run parallel to the conveyor roller shaft 36 of the conveyor roller 35. This allows the conveyor motor 31 and the conveyor roller 35 to be configured in parallel with excellent efficiency, thereby reducing wasted space and further miniaturizing the printing apparatus 1.

[0088] These embodiments have been described in detail above with reference to the accompanying drawings. However, the specific configuration is not limited to these embodiments. Changes, substitutions, deletions, etc., can be made without departing from the spirit of this disclosure.

[0089] As described above, an example of a line-type thermal printhead 21 being used in the printing apparatus 1 has been given; however, the type of printhead 21 is not limited. For example, printhead 21 could also be a line-type inkjet printhead.

[0090] An example of thermal paper being used for recording paper P has been given, but when head 21 is an inkjet head, recording paper P can also be plain paper.

[0091] Furthermore, the recording paper P can also be label paper with a label of a certain shape pasted on the backing paper. The printing device 1 can be a label dispensing device installed in a store. In this case, a photoelectric sensor for detecting the position of the label pasted on the backing paper can be provided at a position downstream of the pull-away position S in the conveying direction of the recording paper P. For example, if the photoelectric sensor is reflective, either the guide 53 and the receiving part 50 of the cover 51 at this position can be mounted with the light-emitting part and the light-receiving part respectively. Alternatively, if the photoelectric sensor is transmissive, the light-emitting part and the light-receiving part can be separately mounted on the guide 53 and the receiving part 50 of the cover 51. In addition, the cutting part 40 may not be provided. Alternatively, a peeling mechanism for peeling the label off the backing paper can be provided at the discharge port 55 instead of the cutting part 40.

[0092] The example of the conveyor motor 31 being a DC motor has been described; however, the conveyor motor 31 can also be a stepper motor or other types of motors. Furthermore, the example of the conveyor motor 31 being a cylindrical motor has been described; however, the conveyor motor 31 can also be other shapes. The conveyor motor 31 can be shaped to fit within the unused space surrounded by the main substrate 60, the sub-substrate 61, and the receiving portion 50.

[0093] In addition, encoder 34 can also be a component of other detection methods such as tachogenerator.

[0094] As a component that transmits the torque of the conveyor motor 31 to the conveyor roller 35, an example of a gear train 38 using multiple gears has been described. However, the torque can also be transmitted via a conveyor belt.

[0095] The head 21 is connected to the main substrate 60 via FFC23, but FPC (Flexible Printed Circuits), flat cables, etc. can also be used.

Claims

1. A printing apparatus, characterized in that, have: The receiving section is capable of holding the roll of paper wound with recording paper. Cover, open or close the receiving part; The conveying unit includes a conveying motor and conveying rollers, and the conveying unit pulls the recording paper out of the paper roll for conveying. The printing section prints on the recording paper at a position opposite to the conveyor roller; The first substrate is equipped with a control unit for controlling the printing section; as well as The second substrate is configured to intersect with the first substrate. The second substrate is configured to face the cover at the position where the receiving portion is closed, with the receiving portion separated from it. The conveyor motor is configured such that it is surrounded by the receiving portion from above the printing device by the first substrate, from behind the printing device by the second substrate, and from the front and below the printing device, and the axis of the conveyor motor is along the axis of the conveyor roller.

2. The printing apparatus according to claim 1, characterized in that, The conveyor motor is a DC motor. An encoder for detecting rotation is installed on the shaft of the conveyor motor.

3. The printing apparatus according to claim 2, characterized in that, A gear train is provided on the side of the conveying motor opposite to the side where the encoder is located, which transmits the torque of the conveying motor to the conveying roller.

4. The printing apparatus according to claim 1, characterized in that, The printing apparatus includes: The communications department is capable of receiving printed data; and The power supply unit supplies power to the conveying unit and the printing unit. The communication unit and the power supply unit are mounted on the second substrate.

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