Roll paper printer

Abstract

To solve the problem that an appropriate transport speed cannot be set according to the transport load, including when correcting paper curl.SOLUTION: A roll paper printer of the invention includes: a case that can accommodate a roll of paper with one side of the paper rolled to the outside; a conveyance roller that pulls paper out of roll paper and conveys it in the direction of conveyance; a first paper guide that can abut on the other side of the paper upstream of the conveyance roller in the conveyance direction; a second paper guide that faces the first paper guide and can abut on the one side of the paper; a third paper guide that is detachable and can be bent by abutting on the one side of the paper upstream of the second paper guide in the conveyance direction; a sensor capable of detecting the third paper guide; and a controller that when the sensor detects the third paper guide, slows down the speed of paper transport by the transport rollers compared to when the third paper guide is not detected.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a roll paper printer. [Background technology]

[0002] BACKGROUND ART Conventionally, as shown in Patent Document 1, there is known a device for printing on paper that includes a means for straightening out curls in paper pulled out from a roll of paper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-19609 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned device is unable to adjust the transport speed to an appropriate level according to the transport load, including when correcting curls in the paper. [Means for solving the problem]

[0005] The roll paper printer includes a case capable of storing roll paper with one side of the paper wound on the outside, a transport roller that pulls the paper from the roll and transports it in a transport direction, a first paper guide that is capable of contacting the other side of the paper upstream of the transport roller in the transport direction, a second paper guide that faces the first paper guide and is capable of contacting one side of the paper, a detachable third paper guide that is capable of contacting and bending one side of the paper upstream of the second paper guide in the transport direction, a sensor that can detect the third paper guide, and a control unit that slows the speed at which the paper is transported by the transport roller when the third paper guide is detected by the sensor compared to when the third paper guide is not detected. [Brief explanation of the drawings]

[0006] [Figure 1] Block diagram of a roll paper printer. [Figure 2] FIG. 10 is a cross-sectional view showing a schematic diagram of a roll paper printer with the third paper guide removed. [Figure 3] FIG. 10 is a cross-sectional view showing a schematic diagram of a roll paper printer with the third paper guide installed. DETAILED DESCRIPTION OF THE INVENTION

[0007] 1. First embodiment 1-1. Roll paper printer configuration A roll paper printer 1 according to an embodiment will be described below with reference to Figures 1 to 3. Directions in the figures will be described using a three-dimensional coordinate system. For ease of explanation, the positive direction of the Z axis will be referred to as the upward direction or simply "up," and the negative direction will be referred to as the downward direction or simply "down," the positive direction of the X axis will be referred to as the rightward direction or simply "right," and the negative direction will be referred to as the leftward direction or simply "left," and the positive direction of the Y axis will be referred to as the forward direction or simply "front," and the negative direction will be referred to as the rearward direction or simply "rear."

[0008] A roll paper printer 1 according to this embodiment is used in, for example, a POS (Point of Sale) system. POS systems are used in retail businesses such as shopping centers, department stores, convenience stores, and in-train sales, as well as food and beverage businesses such as restaurants, coffee shops, and izakayas. The roll paper printer 1 used in a POS system prints receipts, coupons, tickets, and other documents depending on the product or service.

[0009] As shown in FIG. 1, the roll paper printer 1 comprises a control unit 2, a memory unit 3, a head 4, a transport roller 5, and a switch 6 which is a sensor. If the roll paper printer 1 is equipped with a battery (not shown), it can also be carried and used by store staff.

[0010] The control unit 2 is made up of a CPU (Central Processing Unit) that provides overall control of each part of the roll paper printer 1, a UART (Universal Asynchronous Receiver Transmitter) that manages input and output, and logic circuits such as an FPGA (Field Programmable Gate Array) and a PLD (Programmable Logic Device). The CPU is also called a processor. The storage unit 3 includes a flash ROM (Read Only Memory) and an HDD (Hard Disk Drive), which are rewritable nonvolatile memories, and a RAM (Random Access Memory), which is a volatile memory.

[0011] The CPU of the control unit 2 reads out programs such as firmware stored in the nonvolatile memory of the storage unit 3, and executes them using the RAM of the storage unit 3 as a working area. The storage unit 3 also stores setting information used for control by the control unit 2. The setting information includes information related to the transport speed of the transport roller 5, the power supply time of the head 4, and the like. Furthermore, the control unit 2 can change the transport speed of the transport roller 5 based on the detection result of the switch 6, as will be described later.

[0012] A case where the roll paper printer 1 does not have the third paper guide 18 will be described in detail with reference to FIG. As shown in FIG. 2, the roll paper printer 1 includes a head 4, transport roller 5, switch 6, as well as a case 7, cover 8, storage section 9, first paper guide 10, and second paper guide 14. A hinge (not shown) is provided at an upper and front position on the case 7. The cover 8 is attached to the case 7 so as to be rotatable around the hinge. The case 7 is provided with the head 4, the switch 6, the storage section 9, and the second paper guide 14. The switch 6 is fixed to the case 7 via the second paper guide 14. Meanwhile, the cover 8 is provided with the transport roller 5 and the first paper guide 10. In the roll paper printer 1 , either the head 4 or the transport roller 5 can be mounted in the case 7 , and the other of the head 4 or the transport roller 5 can be mounted in the cover 8 .

[0013] The paper P is, for example, a long piece of thermal paper. A thermal material is applied to one side (front surface Pa) of the paper P, and an image can be printed on the front surface Pa using a line thermal head 4. The other side (back surface Pb) of the paper P is the surface that comes into contact with the transport roller 5. Based on the setting information in the storage unit 3, the control unit 2 can rotate the transport roller 5 to transport the paper P in the transport direction indicated by the arrow, and energize the head 4 to print an image. The printed paper P is cut by a cutter (not shown) located downstream in the conveying direction of the head 4 and the conveying roller 5, and is handed over to the customer by the staff as a receipt or the like.

[0014] The roll paper R is wound around the core with the front surface Pa of the paper P facing outward and the back surface Pb facing inward. The closer the paper P is wound to the core of the roll paper R, that is, the smaller the outer diameter of the roll paper R, the stronger the curl. Also, the thicker the paper P, the stronger the curl. The width of the paper P is 45 mm to 80 mm. A partition plate may be used to restrict the width of the paper P. The thickness of the paper P is 0.040 mm to 0.065 mm. The diameter of the roll paper R is 50 mm to 80 mm. The diameter of the core is 12 mm to 18 mm. These values ​​are examples, and other values ​​may also be used.

[0015] The roll paper R can be stored in a storage section 9 located downward inside the case 7. A cover 8 can open and close the case 7. Staff can access the storage section 9 by opening the cover 8 toward the front. The staff member can load paper P into the roll paper printer 1 by opening the cover 8 , placing the roll paper R in the storage compartment 9 , pulling out paper P from the roll paper R, and then closing the cover 8 .

[0016] When the cover 8 is closed, the transport roller 5 provided on the cover 8 is positioned opposite the head 4 provided on the case 7, sandwiching the paper P between them. As a result, the transport roller 5 comes into contact with the back side Pb of the paper P, allowing the paper P to be pulled out from the roll paper R in the storage section 9 and transported in the transport direction. The head 4 also comes into contact with the front side Pa of the paper P, making it possible to print. The transport roller 5, which is positioned opposite the head 4 with the paper P interposed therebetween, is also called a platen roller.

[0017] Furthermore, when the cover 8 is closed, the first paper guide 10 provided on the cover 8 is positioned opposite the second paper guide 14 provided on the case 7, upstream in the transport direction of the transport roller 5, with a predetermined gap between them, with the paper P between them. The first paper guide 10 can come into contact with the back surface Pb of the paper P, and the second paper guide 14 can come into contact with the front surface Pa of the paper P. As a result, a first paper path S1 for guiding the paper P is formed between the first paper guide 10 and the second paper guide 14 that face each other. The first paper guide 10 and second paper guide 14 extend in the left-right direction of the roll paper printer 1, which is the width direction of the paper P, and can guide the paper P across the entire width of the paper P.

[0018] The first paper guide 10 has, in order from upstream to downstream in the paper P transport direction, a first surface 11, a second surface 12, and a third surface 13, which have different shapes from one another. Specifically, the first surface 11 has a protruding shape that protrudes downward in the direction toward the paper P pulled out from the roll paper R stored in the storage section 9. The first surface 11 can regulate the angle of the paper P moving from the storage section 9 toward the second surface 12. The second surface 12 has a concave shape so as to face the protruding third paper guide 18 shown in Figure 3. The third surface 13 has a convex shape so as to guide the paper P toward the head 4 and the transport roller 5 located above.

[0019] The second paper guide 14 has a fourth surface 15 that is inclined so as to guide the paper P toward the head 4 and the transport roller 5 that are positioned above. The fourth surface 15 of the second paper guide 14 faces the third surface 13 of the first paper guide 10 and together with the third surface 13 forms a first paper path S1.

[0020] As will be described later, second paper guide 14 is formed with groove 16 for attaching third paper guide 18 shown in Figure 3, and notched latch 17 for forming a snap fit. Groove 16 may be in the shape of a hole or a notch. Since the second paper guide 14 is fixed to the case 7, as shown in Figure 3, the third paper guide 18 can be fixed to the case 7 via the second paper guide 14. The third paper guide 18 can be attached to and detached from the case 7 via the second paper guide 14.

[0021] At least one of the groove 16 and the latch 17 may be configured to be directly provided on the case 7. When the groove 16 is provided on the case 7, the third paper guide 18 becomes detachable from the case 7. In this case, the switch 6 is also provided on the case 7. Furthermore, at least one of the groove 16 and the latch 17 may be provided on a support (not shown) instead of the second paper guide 14, and this support may be attached to the case 7. In this case, the switch 6 is also provided on the support. In this way, the groove 16 and the latch 17 can be configured to be provided directly or indirectly on the case 7 .

[0022] The lever 6a of the switch 6 can rotate around a shaft 6b. Inside the switch 6, two contacts are made of metal, and the switch is configured to be ON when the two contacts come into contact and OFF when the two contacts separate. FIG. 2 shows the state in which the third paper guide 18 shown in FIG. 3 is removed from the groove 16. The lever 6a of the switch 6 rotates clockwise and advances into the groove 16 of the second paper guide 14. In this state, the two contacts of the switch 6 are separated, and the switch 6 is turned OFF. In this way, the switch 6 can send an OFF signal to the control unit 2 when it does not detect the third paper guide 18.

[0023] 3, when the third paper guide 18 is inserted into the groove 16 and is pushed by the third paper guide 18 to rotate the lever 6a counterclockwise, the two contacts of the switch 6 come into contact and conduct, turning the switch 6 ON. In this way, when the switch 6 detects the third paper guide 18, it can send an ON signal to the control unit 2. The ON / OFF states of the switch 6 may be reversed.

[0024] 2, the control unit 2 receives an OFF signal from the switch 6. By receiving an OFF signal, the control unit 2 can determine that the switch 6 has not detected the third paper guide and that the roll paper printer 1 does not have a third paper guide. The storage unit 3 stores, as setting information, the conveying speed corresponding to when the switch 6 is OFF, i.e., the conveying speed corresponding to when there is no third paper guide. The storage unit 3 also stores, as setting information, the conveying speed corresponding to when the switch 6 is ON, i.e., the conveying speed corresponding to when there is a third paper guide. The conveying speed corresponding to when the switch 6 is OFF and there is no third paper guide is, for example, 100 mm / sec, and is stored in the storage unit 3 as setting information.

[0025] The control unit 2 reads out the transport speed corresponding to when the switch 6 is OFF from the setting information in the storage unit 3. The control unit 2 controls the transport roller 5 to transport the paper P at the read transport speed of 100 mm / sec. The conveying speed of 100 mm / sec when switch 6 is OFF is faster than the conveying speed of 65 mm / sec when switch 6 is ON and detects the third paper guide, as will be described later. This is because when switch 6 is OFF and there is no third paper guide, the conveying load of paper P is smaller than when there is a third paper guide.

[0026] Next, a detailed description will be given of a roll paper printer 1 equipped with a third paper guide 18, with reference to FIG. As shown in FIG. 3, the third paper guide 18 that is attached to the roll paper printer 1 has a fifth surface 19, a hook 21 that forms a snap fit, and a protrusion 20. The third paper guide 18 is attached to the second paper guide 14 by the staff member inserting the protrusion 20 of the third paper guide 18 into the groove 16 of the second paper guide 14. On the other hand, the third paper guide 18 is detached from the second paper guide 14 by the staff member removing the protrusion 20 of the third paper guide 18 from the groove 16 of the second paper guide 14. In this way, the third paper guide 18 is detachable from the second paper guide 14.

[0027] As described above, the second paper guide 14 is fixed to the case 7. The third paper guide 18 is attached to the case 7 via the second paper guide 14. If the groove 16 is provided in the case 7 instead of the second paper guide 14, the third paper guide 18 can be attached directly to the case 7. If the groove 16 is provided in the support, the third paper guide 18 can be attached to the case 7 via the support. In this way, the third paper guide 18 can be configured to be attached to the case 7 directly or indirectly.

[0028] The hook 21 of the third paper guide 18 forms a snap fit with the latch 17 of the second paper guide 14 . The staff member inserts the protrusion 20 of the third paper guide 18 into the groove 16 of the second paper guide 14, and then engages the hook 21 of the third paper guide 18 with the latch 17 of the second paper guide 14. As a result, the third paper guide 18 is secured to the second paper guide 14 by a snap fit. The third paper guide 18 is secured to the case 7 via the second paper guide 14 by a snap fit. Meanwhile, the staff member can also remove the hook 21 of the third paper guide 18 from the latch 17 of the second paper guide 14 and remove the third paper guide 18.

[0029] The staff member can also secure the third paper guide 18 to the second paper guide 14 by inserting and tightening a screw 22 into a screw hole provided in the second paper guide 14. The third paper guide 18 is secured to the case 7 via the second paper guide 14 by the screw 22. Alternatively, the staff member can remove the screw 22 and remove the third paper guide 18. The third paper guide 18 may be secured to the second paper guide 14 by a snap fit formed by a hook 21 and a latch 17 and / or by a screw 22 .

[0030] If the latch 17 or the screw hole is provided on the case 7 instead of the second paper guide 14, the third paper guide 18 can be fixed directly to the case 7 by a snap fit or a screw. If the latch 17 or the screw hole is provided on the support, the third paper guide 18 can be fixed to the case 7 via the support. In this way, the third paper guide 18 can be configured to be fixed to the case 7 directly or indirectly.

[0031] As mentioned above, the closer the paper P is to the core of the roll paper R and the smaller the diameter of the roll paper R, the more curled the paper tends to be. Receipts and other documents printed on such paper P will curl inward, as they were when rolled, degrading the quality of the printed matter. There is also a risk that the curled paper P may get caught downstream of the transport roller 5 and head 4 in the transport direction.

[0032] As shown in Figure 3, the third paper guide 18 has a fifth surface 19 that can come into contact with the paper P. The fifth surface 19 has a convex shape that protrudes toward the concave second surface 12 of the first paper guide 10. The fifth surface 19 may have an arc shape. In this case, the fifth surface 19 has an arc shape with a diameter of 2 mm, for example. The diameter of the arc shape of the fifth surface 19, 2 mm, is smaller than 1 / 5 of the diameter of the core of the roll paper R, which is 12 mm to 18 mm.

[0033] The fifth surface 19 of the third paper guide 18 and the second surface 12 of the first paper guide 10 face each other to form a second paper path S2 for the paper P. The second paper path S2 contacts the paper P and bends at an acute angle in the opposite direction to the curl of the paper P being transported so as to correct the curl of the paper P. In this way, the paper P pulled out from the roll paper R in the storage section 9 travels from upstream to downstream in the transport direction through the second paper path S2 formed by the opposing third paper guide 18 and first paper guide 10, where the curl is corrected, and then the paper P is transported to the transport roller 5 and head 4 through the first paper path S1 formed by the opposing second paper guide 14 and first paper guide 10.

[0034] However, as the paper P is used, the diameter of the roll paper R may change, or the roll paper R may roll inside the storage unit 9 when the staff member is carrying the roll paper printer 1 . Even in these cases, the first surface 11 of the first paper guide 10 can contact the paper P pulled out from the roll paper R, and can regulate the angle of the paper P heading toward the second paper path S2 to be constant.

[0035] The paper P abuts against the first surface 11 of the first paper guide 10, and then abuts against the fifth surface 19 of the third paper guide 18 in the second paper path S2, and then abuts against the third surface 13 of the first paper guide 10 in the first paper path S1. In this way, the paper P pulled out from the roll paper R stored in the storage section 9 can come into contact with the first surface 11 of the first paper guide 10, the fifth surface 19 of the third paper guide 18, and the third surface 13 of the first paper guide 10, specifically from upstream to downstream in the conveying direction.

[0036] More specifically, the paper P is transported from the first surface 11 of the first paper guide 10 to the fifth surface 19 of the third paper guide 18 at a first angle α, and then from the fifth surface 19 of the third paper guide 18 to the third surface 13 of the first paper guide 10 at a second angle β. The first angle α and the second angle β are constant angles. The paper P is stably transported at the first angle α and the second angle β upstream and downstream of the fifth surface 19 of the third paper guide 18. Furthermore, the fifth surface 19 comes into contact with the paper P over a predetermined area.

[0037] At this time, the fifth surface 19 of the third paper guide 18 can be bent at an acute angle, at a predetermined angle defined by the first angle α and the second angle β, in the opposite direction to the curl of the paper P relative to the surface Pa of the paper P being transported by the transport roller 5. Also, the fifth surface 19 of the third paper guide 18 can strongly rub, over a predetermined area, the surface Pa of the paper P being transported, as if squeezing it. In this way, the fifth surface 19 of the third paper guide 18 is bent in the opposite direction to the curl of the paper P, and can stably abut at a predetermined angle and with a predetermined area determined by the first angle α and the second angle β. The third paper guide 18 can stably correct the curl of the paper P even if the diameter of the roll paper R changes or the paper rolls in the storage section 9.

[0038] As shown in Figure 3, the protrusion 20 of the third paper guide 18 is inserted into the groove 16 of the second paper guide 14. The lever 6a of the switch 6 abuts against the protrusion 20 of the third paper guide 18 and is rotated counterclockwise. In this state, the two contacts of the switch 6 are in contact and conductive, and the switch 6 is ON. In this way, when the switch 6 detects the third paper guide 18, it can send an ON signal to the control unit 2.

[0039] The control unit 2 receives an ON signal from the switch 6. By receiving an ON signal, the control unit 2 can determine that the switch 6 has detected the third paper guide and that the roll paper printer 1 has a third paper guide. The transport speed corresponding to when the switch 6 is ON and the third paper guide is present, which is stored as setting information in the memory unit 3, is, for example, 65 mm / sec. The control unit 2 reads out the transport speed corresponding to when the switch 6 is ON from the setting information in the memory unit 3. The control unit 2 controls the transport roller 5 at the read transport speed of 65 mm / sec to transport the paper P.

[0040] The conveying speed of 65 mm / sec when the switch 6 is ON is slower than the conveying speed of 100 mm / sec when the switch 6 is OFF, as described above. When switch 6 is ON and the third paper guide is present, the fifth surface 19 of the third paper guide bends the transported paper P at an acute angle in the opposite direction to the curl of the paper P, rubbing it hard as if squeezing it, so the transport load on the paper P is greater than when the third paper guide is not present. By slowing down the transport speed of the transport roller 5, it is possible to ensure that the transport roller 5 has the torque to transport the paper P despite the large transport load caused by the third paper guide. On the other hand, as shown in Figure 2, when switch 6 is OFF and there is no third paper guide, the transport load of paper P is smaller than when there is a third paper guide, so even if the transport speed of transport roller 5 is increased, the torque with which transport roller 5 transports paper P can be ensured.

[0041] When using thick paper P, for example, with a thickness of 0.065 mm and a strong curl, the staff member will attempt to correct the curl by attaching the third paper guide 18 to the second paper guide 14 and fixing it to the case 7 by a snap fit or the like. Switch 6 detects third paper guide 18 and sends an ON signal to control unit 2. By acquiring the ON signal from switch 6, that is, by detecting third paper guide 18 by switch 6, control unit 2 sets the transport speed of paper P by transport roller 5 to 65 mm / sec, making the transport speed slower than when third paper guide 18 is not detected.

[0042] As described above, the roll paper printer 1 has the third paper guide 18, so the transport load of the paper P is heavy. In this case, the roll paper printer 1 can transport the paper P while straightening the curl by slowing down the transport speed of the transport roller 5.

[0043] On the other hand, when using thin paper P, for example, with a paper thickness of 0.040 mm and little curl, the staff member determines that straightening the curl is not necessary and removes the third paper guide 18 from the case 7. Because switch 6 does not detect third paper guide 18, it sends an OFF signal to control unit 2. By obtaining the OFF signal from switch 6, that is, by not detecting third paper guide 18 by switch 6, control unit 2 sets the conveying speed of conveying roller 5 to 100 mm / sec, which is faster than when third paper guide 18 is detected.

[0044] As mentioned above, the roll paper printer 1 does not have a third paper guide 18, so the transport load of the paper P is small. In this case, the roll paper printer 1 can transport the paper P at a faster transport speed of the transport roller 5 than when the third paper guide 18 is present, thereby increasing printing speed. In other words, the roll paper printer 1 can increase printing throughput.

[0045] As described above, the roll paper printer 1 of this embodiment is equipped with a first paper guide 10, a second paper guide 14 that faces the first paper guide 10, and a third paper guide 18 that can contact the paper P and bend it in the opposite direction to the curl. The third paper guide 18 is detachable from the case 7, upstream of the second paper guide 14 in the transport direction. When the third paper guide 18 is detected by the switch 6, the control unit 2 can slow down the transport speed of the paper P by the transport roller 5 compared to when the third paper guide 18 is not detected.

[0046] When the third paper guide 18 is installed, the roll paper printer 1 experiences a greater transport load from the paper P, so the transport speed of the transport roller 5 is slowed down, allowing the paper P to be transported while the curl is corrected. On the other hand, when the third paper guide 18 is not installed, the roll paper printer 1 reduces the transport load of the paper P, so the transport speed of the transport roller 5 can be increased, increasing printing throughput. In this way, the roll paper printer 1 can set the appropriate transport speed according to the transport load, including when straightening the curl of the paper P.

[0047] The present embodiment has been described above in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and may be changed, replaced, deleted, etc., as long as it does not deviate from the gist of the present invention.

[0048] In the above description, the head 4 is described as a thermal head, but the printing method is not limited thereto. For example, the head 4 may be an inkjet head. In this case, since the inkjet head cannot contact the transport roller 5 and transport the paper P by nipping it therebetween, a driven roller that faces the transport roller 5 and can transport the paper P by nipping it therebetween can be mounted in the case 7.

[0049] In the above description, the switch 6 as a sensor is described as a so-called mechanical switch having a lever 6a, but other sensors may also be used. For example, a reflective or transmissive optical sensor may be used. Such an optical sensor can detect the third paper guide 18.

[0050] The side of the paper P that contacts the third paper guide 18 does not have to be the side to be printed. The roll paper R is wound so that the side to be printed of the paper P faces inward. In this case, the positions of the head 4 and the transport roller 5 are reversed relative to the positions shown in Figures 2 and 3. [Explanation of symbols]

[0051] 1...roll paper printer, 2...control unit, 3...memory unit, 4...head, 5...transport roller, 6...switch, 7...case, 8...cover, 9...storage unit, 10...first paper guide, 11...first side, 12...second side, 13...third side, 14...second paper guide, 15...fourth side, 16...groove, 17...latch, 18...third paper guide, 19...fifth side, 20...projection, 21...hook, 22...screw, P...paper, Pa...front side, Pb...back side, S1...first paper path, S2...second paper path, R...roll paper.

Claims

1. a case capable of accommodating roll paper with one side of the paper wound outward; a transport roller that pulls out the paper from the roll paper and transports it in a transport direction; a first paper guide that is capable of contacting the other side of the paper upstream of the transport roller in the transport direction; a second paper guide facing the first paper guide and capable of contacting the one side of the paper; a third paper guide that is detachable and that is capable of contacting and bending the one side of the paper upstream of the second paper guide in the transport direction; a sensor capable of detecting the third paper guide; A roll paper printer comprising: a control unit that slows the paper transport speed by the transport roller when the third paper guide is detected by the sensor, and when the third paper guide is not detected.

2. a head for printing on the paper; a cover for opening and closing the case, the transport roller is provided on either the case or the cover, the head is provided on the other of the case and the cover, the first paper guide is provided on the cover, the second paper guide is provided in the case, The roll paper printer according to claim 1 , wherein the third paper guide is detachable from the case.

3. the first paper guide has, in order from upstream in the transport direction, a first surface, a second surface, and a third surface that are different in shape from one another; the second paper guide faces the third surface of the first paper guide to form a first paper path; the third paper guide faces the second surface of the first paper guide and forms a curved second paper path; 3. The roll paper printer according to claim 1, wherein the paper pulled from the roll paper can come into contact with the first surface of the first paper guide.

4. the third paper guide has a protrusion; the case has a groove; The roll paper printer according to claim 1 , wherein the third paper guide can be attached to the case by inserting the protrusion into the groove.

5. the third paper guide has a hook; the case has a latch; the hook and the latch form a detachable snap fit; The roll paper printer according to claim 1 , wherein the third paper guide is fixed to the case by fitting the hook into the latch of the case.

6. The roll paper printer according to claim 1 , wherein the third paper guide is removably fixed to the case with a screw.

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