Roll paper printer

Abstract

To solve a problem that the size of a printer increases due to complexity of a structure which buffers a tensile force of recording paper and corrects a curl.SOLUTION: A roll paper printer includes: a storage part capable of storing roll paper rolled in a manner that one surface of recording paper is located at the outer side; a transport roller which draws the recording paper from the roll paper and transports the recording paper in a transport direction; a guide which may contact with the other surface of the recording paper at the upstream of the transport roller in the transport direction; and a projection which may contact with the one surface of the recording paper at the upstream of the transport roller in the transport direction and may move toward the guide.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, there is known a printer that adjusts the tension of paper pulled out from a roll of paper, as shown in Patent Document 1. Also, there is known a printer that straightens out curls in paper pulled out from a roll of paper, as shown in Patent Document 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-52405 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-99852 Summary of the Invention [Problem to be solved by the invention]

[0004] To adjust the tension of the paper pulled from the roll and correct the curl, it is necessary to have both of the above-mentioned printer components, which makes the printer not only complex in configuration but also large in size. [Means for solving the problem]

[0005] The roll paper printer comprises a storage section capable of storing roll paper with one side of the recording paper wound on the outside, a transport roller that pulls the recording paper from the roll paper and transports it in a transport direction, a guide that can abut against the other side of the recording paper upstream of the transport roller in the transport direction, and a protrusion that can abut against the one side of the recording paper upstream of the transport roller in the transport direction and that can move toward the guide. [Brief explanation of the drawings]

[0006] [Figure 1] Cross-sectional view of a roll paper printer with a large diameter roll paper. [Figure 2] 10 is an enlarged view of the transport path when the diameter of the roll paper is large. [Figure 3] Cross-sectional view of a roll paper printer when the diameter of the roll paper is small. [Figure 4] 10 is an enlarged view of the transport path when the diameter of the roll paper is small. 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 4. 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 is configured to include a protrusion 3, a guide 5, a transport roller 6, a head 7, and a cutter 8. A hinge 11 is provided at a position facing downward and forward on the case 14. The cover 10 is attached so as to be rotatable about the hinge 11. The case 14 is equipped with the protrusion 3, the head 7, the second blade 8b of the cutter 8, and a storage section 12, which will be described later. On the other hand, the cover 10 is equipped with the guide 5, the transport roller 6, and the first blade 8a of the cutter 8.

[0010] The recording paper 2 is, for example, a long piece of thermal paper. A thermal material is applied to one side, the front side 2a, of the recording paper 2, and an image can be printed on it using a head 7. The other side, the back side 2b, of the recording paper 2 is the surface that comes into contact with the transport roller 6. The roll paper R is wound around the core R0 with the front surface 2a of the recording paper 2 facing outward and the back surface 2b facing inward. The closer the recording paper 2 is wound to the core R0 of the roll paper R, that is, the smaller the outer diameter of the roll paper R, the stronger the curl. Note that hereinafter, the outer diameter will simply be referred to as the diameter. The recording paper 2 has a paper width of, for example, 80 mm. The recording paper 2 may have a paper width of 58 mm. The recording paper 2 has a thickness of, for example, 0.06 mm to 0.08 mm. The diameter of the core R0 is, for example, 18 mm.

[0011] The roll paper R can be stored in a storage section 12 located downward inside the case 14. The cover 10 can open and close the storage section 12. The user can access the storage section 12 by opening the cover 10 toward the front. The user can load recording paper 2 into the roll paper printer 1 by opening cover 10 , storing roll paper R in storage section 12 , pulling out recording paper 2 from roll paper R, and closing cover 10 .

[0012] When the cover 10 is closed, the guide 5 mounted on the cover 10 is positioned opposite the protrusion 3 mounted on the case 14, with the recording paper 2 between them. As a result, a curved transport path 9 for the recording paper 2 is formed between the opposing guide 5 and protrusion 3, as will be described later. When the cover 10 is closed, a rectangular outlet 13 is formed at the boundary between the cover 10 and the case 14 .

[0013] Furthermore, when the cover 10 is closed, the transport roller 6 mounted on the cover 10 is positioned opposite the head 7 mounted on the case 14, sandwiching the recording paper 2. As a result, the transport roller 6 comes into contact with the back surface 2b of the recording paper 2, enabling transport, and the head 7 comes into contact with the front surface 2a of the recording paper 2, enabling printing. The transport roller 6, which is positioned opposite the head 7 across the recording paper 2, is also called a platen roller. Furthermore, the first blade 8a of the cutter 8 mounted on the cover 10 is positioned opposite the second blade 8b mounted on the case 14, with the recording paper 2 in between. The first blade 8a moves toward the second blade 8b, allowing the recording paper 2 between them to be cut.

[0014] The head 7 is, for example, a line-type thermal head with multiple heating elements lined up on the left and right. The multiple heating elements of the head 7 are selected based on the print data and generate heat, allowing an image to be printed on the recording paper 2, which is thermal paper.

[0015] The transport roller 6 is rotated counterclockwise as indicated by the arrow by a transport roller motor (not shown). The transport roller 6 pulls out the recording paper 2 from the roll paper R in the storage section 12 and transports it via the transport path 9 in the transport direction indicated by the arrow from the transport roller 6 and head 7 to the discharge port 13 and cutter 8. At this time, as the recording paper 2 is pulled out, the roll paper R also rotates counterclockwise as indicated by the arrow. From upstream to downstream in the conveying direction, a storage section 12, a conveying path 9 formed by guides 5 and protrusions 3, a conveying roller 6 and head 7, a cutter 8, and a discharge port 13 are arranged in this order.

[0016] The protrusion 3 can move in a first direction, direction A, or a second direction, direction B. Specifically, the protrusion 3 can advance in direction A, which is the direction toward the guide 5, and can retreat in direction B, which is the direction away from the guide 5. Direction B is the opposite direction to direction A. The protrusion 3 is attached to an elastic member 4. The protrusion 3 is pushed in the direction A by a pressing force S of the elastic member 4. The elastic member 4 is expandable and contractible and is made of a spring, rubber, or the like. The elastic member 4 is, for example, a compression coil spring. One end of the elastic member 4 is fixed to the case 14, and the other end can push the protrusion 3 in the direction A.

[0017] The protrusion 3 is configured to be movable up to a distance of 6.0 mm in direction B, based on the position when the recording paper 2 is not in the transport path 9 and is not in contact with the recording paper 2. This distance is also the length over which the elastic member 4 can be compressed. The protrusion 3 is configured to extend in the paper width direction of the recording paper 2, which is the left-right direction. For example, the protrusion 3 extends, for example, 80 mm in the paper width direction to match the paper width of the recording paper 2. The elastic members 4 may be provided at least on the left and right of the protrusion 3. By arranging the elastic members 4 in this manner, the protrusion 3 can apply a pressing force S of the elastic members 4 to the recording paper 2 in a balanced manner in the paper width direction. Like the protrusion 3, the guide 5 is also configured to extend in the paper width direction of the recording paper 2.

[0018] Meanwhile, tension T1 is applied in the direction of the arrow, which is the same direction as the transport direction, to the recording paper 2 that is pulled from the roll paper R and by the transport roller 6. As a result, the tension T1 causes the protrusion 3 to come into contact with the recording paper 2 and push it in direction B.

[0019] 1-2. Regarding large diameter roll paper 1 and 2 show the case where the diameter of the roll paper R is a large diameter D1, while Figures 3 and 4 show the case where the diameter of the roll paper R is a small diameter D2. The following will explain the two cases by comparing them. In the following, diameter D1 of roll paper R will be referred to simply as diameter D1 to indicate an example of a large diameter roll paper R, and diameter D2 of roll paper R will be referred to simply as diameter D2 to indicate an example of a small diameter roll paper R. Diameter D1 is, for example, 80 mm, and diameter D2 is, for example, 30 mm.

[0020] 1 is larger than the diameter D2 shown in Fig. 3, the roll paper R is larger and heavier, and the load on the transport roller 6 when transporting the recording paper 2 is also greater. As a result, the tension T1 on the recording paper 2 shown in Figs. 1 and 2 is also larger than the tension T2 shown in Figs. 3 and 4.

[0021] When the diameter D1 becomes large, the load on the transport roller 6 increases rapidly due to the inertia of the roll paper R, especially when the transport roller 6 starts transporting the recording paper 2, and the tension T1 on the recording paper 2 also increases rapidly. In this case, when the transport roller 6 starts transporting the recording paper 2, the load of the roll paper R is affected by inertia, and the transport roller 6 may not be able to transport the recording paper 2.

[0022] The protrusion 3 abuts against the surface 2a of the recording paper 2 and moves in the direction B under the tension T1 of the recording paper 2, while applying the pressing force S of the elastic member 4 in the direction A, thereby cushioning the tension T1. In other words, just as the tension T1 resists pushing the recording paper 2 in direction B, the protrusion 3 can act to push the recording paper 2 in direction A, opposite direction B, with the pressing force S of the elastic member 4, thereby canceling out each other's forces.

[0023] The pressing force S of the elastic member 4 increases as the protrusion 3 moves in direction B, as the elastic member 4 is compressed. Therefore, as the tension T1 of the recording paper 2 increases and presses the protrusion 3 in direction B, the pressing force S of the elastic member 4 that pushes back in direction A also increases. In this way, the projections 3 can buffer the tension of the recording paper 2 according to the magnitude of the tension of the recording paper 2, in other words, according to the diameter of the roll paper R. As a result, even when the diameter is as large as D1, the transport roller 6 can stably transport the recording paper 2. In particular, even when the impact of inertia is large at the start of transport and the tension T1 on the recording paper 2 increases suddenly, the protrusions 3 buffer the tension T1, allowing the transport roller 6 to stably transport the recording paper 2.

[0024] As described above, when the transport roller 6 transports the recording paper 2, the roll paper R is also pulled out and rolls counterclockwise inside the storage unit 12. As the roll paper R rolls, the friction between the roll paper R and the storage unit 12 changes, causing the load on the transport roller 6 when transporting the recording paper 2 to fluctuate. As a result, the tension T1 on the recording paper 2 also fluctuates.

[0025] In particular, when the diameter D1 is large, the fluctuations in tension T1 also become large. If the fluctuations in tension T1 are large, the transport roller 6 may not be able to transport the recording paper 2 at a constant speed, which may result in a deterioration in print quality. The constant speed at which the transport roller 6 transports the recording paper 2 is, for example, 500 mm / sec. In this case as well, the protrusion 3 moves in direction A or B in response to fluctuations in tension T1 of the recording paper 2, and the pressing force S of the elastic member 4 is used to buffer fluctuations in tension T1 of the recording paper 2. As a result, the transport roller 6 can transport the recording paper 2 at a constant speed.

[0026] Next, referring to FIG. 2, the case of diameter D1 will be described in detail, focusing on the conveying path 9 formed by the guide 5 and the protrusion 3. The guide 5 has a recess 5a and a protrusion 5b that continues upstream of the recess 5a in the conveying direction. The recess 5a of the guide 5 is located opposite the tip 3a of the protrusion 3. The recess 5a of the guide 5 is also called a recess, and the protrusion 5b is also called a convex.

[0027] As shown in Figure 2, the recording paper 2 is pulled out from the roll paper R by the transport roller 6, and then the back surface 2b abuts against the protrusion 5b of the guide 5, and then the front surface 2a abuts against the tip 3a of the protrusion 3 downstream in the transport direction, and the recording paper is transported. In this way, the conveying path 9 formed by the guide 5 and the protrusion 3 is bent and curved with a variable curvature as will be described later.

[0028] The protrusions 3 are made of resin such as plastic. At least the tip 3a of the protrusions 3, which is the portion that comes into contact with the surface 2a of the recording paper 2, is covered with a sheet containing ultra-high molecular weight polyethylene. Ultra-high molecular weight polyethylene has a molecular weight of 1 to 7 million, compared to the molecular weight of ordinary polyethylene, which is 2 to 3 million. As a result, it is possible to reduce friction when the tip 3a of the protrusion 3 comes into contact with the recording paper 2, and it is possible to reduce the load on the transport roller 6 when transporting the recording paper 2.

[0029] In Figure 2, because the diameter D1 is large, the tension T1 on the recording paper 2 is also large, and it presses the protrusion 3 strongly in direction B. For this reason, the position of the protrusion 3 shown in Figure 2 is retracted in direction B compared to the position of the protrusion 3 with diameter D2 shown in Figure 4. As a result, as shown in FIG. 2, the transport path 9 formed between the guide 5 and the protrusion 3 is wider than in the case of FIG. 4 because the protrusion 3 is located farther away from the guide 5.

[0030] In addition, the angle of the recording paper 2 surrounding the tip 3a of the protrusion 3, i.e., the angle formed by the recording paper 2 moving from the protrusion 5b of the guide 5 to the tip 3a of the protrusion 3 and the recording paper 2 moving from the tip 3a of the protrusion 3 to the conveying roller 6, is larger in the case of diameter D1 shown in Figure 2 than in the case of diameter D2 shown in Figure 4. The angle of the recording paper 2 surrounding the tip 3a of this protrusion 3 indicates the curvature of the bending of the conveying path 9. In the case of diameter D1, the curvature of the bending of the conveying path 9 is larger and gentler than in the case of diameter D2. In this way, in the case of diameter D1, the curvature of the conveying path 9 is gentler than in the case of diameter D2, so the area of ​​the part of the recording paper 2 that wraps around and abuts the protrusion 5b of the guide 5 and the area of ​​the part that wraps around and abuts the tip 3a of the protrusion 3 are smaller.

[0031] As described above, the more the protrusion 3 moves in direction B, the more the elastic member 4 is compressed, and the greater the pressing force S of the elastic member 4. The position of the protrusion 3 shown in FIG. 2 is further retracted in direction B compared to FIG. 4, and therefore the pressing force S of the elastic member 4 is greater. In the case of diameter D1, even if the tension T1 of the recording paper 2 suddenly increases when conveyance starts, the tension T1 can be instantly buffered because the protrusion 3 is located in a position where the pressing force S of the elastic member 4 acts strongly.

[0032] 1-3. When the diameter of the roll paper is small 3 and 4, a case where the diameter D2 is smaller than the diameter D1 shown in FIGS. 1 and 2 will be described. As mentioned above, recording paper 2 wound around a small diameter, such as diameter D2, near core R0 of roll paper R will curl strongly. Receipts, coupons, tickets, and other documents printed on such recording paper 2 will also curl inward, as they were wound, degrading the quality of the printed matter. Furthermore, because there is nothing to regulate the recording paper 2 downstream of the transport roller 6 and head 7 in the transport direction, there is a risk that the curled recording paper 2 will get caught in the cutter 8 or discharge port 13.

[0033] The protrusion 3 applies a pressing force S of the elastic member 4 in the direction A, and comes into contact with the surface 2a of the recording paper 2 as it is being conveyed, squeezing it, thereby correcting any curl in the recording paper 2. 3, diameter D2 is smaller than diameter D1, so the roll paper R is lighter and the load on the transport roller 6 when transporting the recording paper 2 is also reduced. As a result, tension T2 on the recording paper 2 shown in FIGS. 3 and 4 is also smaller than tension T1 shown in FIGS. 1 and 2.

[0034] Referring to FIG. 4, the conveying path 9 formed by the guide 5 and the protrusion 3 when the diameter D2 is smaller than the diameter D1 will be described in detail. 4, compared to the case of FIG. 2, tension T2 of recording paper 2 is smaller than tension T1, so pressing force S of elastic member 4 pushes protrusion 3, which is in contact with recording paper 2, further in direction A. Therefore, the position of protrusion 3 shown in FIG. 4 is further advanced in direction A than the position of protrusion 3 shown in FIG. 2.

[0035] As a result, as shown in FIG. 4, the transport path 9 formed between the guide 5 and the protrusion 3 is narrower than in the case of FIG. 2 because the protrusion 3 is positioned further into the guide 5. Therefore, as shown in Fig. 4, the angle of the recording paper 2 surrounding the tip 3a of the protrusion 3, that is, the angle between the recording paper 2 moving from the protrusion 5b of the guide 5 to the tip 3a of the protrusion 3 and the angle between the recording paper 2 moving from the tip 3a to the transport roller 6, is smaller than in the case of Fig. 2. In this way, the curvature of the bending of the transport path 9 shown in Fig. 4 is smaller, and the bending is sharper. Because the conveying path 9 is curved sharply, the area of ​​the portion of the recording paper 2 that contacts the protruding portion 5b of the guide 5 and the area of ​​the portion that contacts the tip 3a of the protrusion 3 are increased.

[0036] In this way, as the diameter decreases from D1 to D2, the protrusion 3 moves in the direction A, the conveying path 9 becomes more curved, and the recording paper 2 is further bent in a direction that straightens the curl. In other words, the protrusion 3 moves in accordance with the change in the diameter of the roll paper R from diameter D1 to diameter D2. The curvature of the conveyance path 9 formed between the opposing guide 5 and protrusion 3 changes in accordance with the movement of the protrusion 3. As a result, as the diameter D2 decreases and the curl of the recording paper 2 increases, the curve of the conveying path 9 becomes tighter, and the curl can be straightened more effectively.

[0037] In order to cope with cases where the effect of inertia is particularly large, the pressing force S of the elastic member 4 may be set to be strong. Specifically, the pressing force S of the elastic member 4 is set to be strong compared to the force that presses the recording paper 2 by the tension T1 shown in Figures 1 and 2 at the start of conveyance. In this case, even in the case of diameter D1, the protrusion 3 moves in direction A and may end up in approximately the same position as shown in Figures 3 and 4. As a result, even if the diameter D1 is greater than the diameter D2, a conveying path 9 with a sharp bend can be formed, and curls in the recording paper 2 can be corrected, just as in the case of the diameter D2.

[0038] The curvature of the tip 3a of the protrusion 3 for correcting the curl is preferably 0.5 mm or more and 2.2 mm or less. The curvature of the tip 3a for correcting the curl more effectively is preferably 0.8 mm or more and 1.0 mm or less. By defining the curvature of the tip 3a of the protrusion 3 in this way, it is possible to straighten out the curl of the recording paper 2. As a result, it is possible to suppress deterioration in the quality of the printed matter. It is also possible to prevent the curled recording paper 2 from getting caught in the cutter 8 or the discharge port 13.

[0039] As described above, the roll paper printer 1 of this embodiment is equipped with the protrusion 3 that can come into contact with the surface 2 a of the recording paper 2 and move toward the guide 5 . As a result, the protrusions 3 move in accordance with the diameter of the roll paper R, cushioning the tension on the recording paper 2. Furthermore, as the diameter of the roll paper R decreases and the curl of the recording paper 2 increases, the protrusions 3 also move, straightening the curl. In this way, the roll paper printer 1 of the above-described embodiment can absorb tension in the recording paper 2 and straighten curls with a simple configuration that includes the guide 5 and protrusion 3. It also allows the size of the roll paper printer 1 to be kept small.

[0040] 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.

[0041] In the above description, the head 7 is described as a thermal head, but the printing method is not limited thereto. For example, the head 7 may be an inkjet head. In this case, since the inkjet head cannot come into contact with the transport roller 6 to sandwich the recording paper 2, a driven roller that faces the transport roller 6 and sandwiches the recording paper 2 therebetween can be mounted in the case 14.

[0042] In the above description, the protrusion 3 is made of a resin such as plastic, but the tip 3a of the protrusion 3 may be made of a metal cylinder having a diameter of the same curvature. The metal may be stainless steel, for example. Furthermore, this metal cylinder may be provided with a bearing that allows it to rotate and move in directions A and B. Furthermore, this metal cylinder may be covered with a sheet containing ultra-high molecular weight polyethylene.

[0043] Furthermore, a guide portion made of a wall or the like that guides the protrusion 3 may be provided around the protrusion 3 so that the protrusion 3 can move smoothly in directions A and B. The guide portion may be configured to extend around the protrusion 3 in directions A and B.

[0044] Furthermore, in the guide 5, at least the protrusion 5b that contacts the recording paper 2 may be covered with a sheet containing ultra-high molecular weight polyethylene. This reduces friction between the protrusion 5b and the recording paper 2, and reduces the load on the transport roller 6 when transporting the recording paper 2.

[0045] In the above description, the elastic member 4 is fixed to the case 14, but it may also be fixed to the storage section 12 that stores the roll paper R. In this case, the storage section 12 shown in Figures 1 and 3 can be extended to an upper position so that the elastic member 4 is fixed. In this case, since the protrusion 3 is attached to the elastic member 4, the protrusion 3 is also mounted on the storage section 12. Alternatively, an axis may be provided at a position below and rearward of the case 14, one end of a lever may be rotatably attached to the axis, and the protrusion 3 may be attached to the other end of the lever. The protrusion 3 attached to the other end of the lever can move around the axis. The elastic member 4 may be configured to press the protrusion 3 directly, or may be configured to press the protrusion 3 via the lever.

[0046] In the above, the roll paper printer 1 was described as being used with the outlet 13 facing forward, but it can also be used with the outlet 13 facing upward. In this case, the storage section 12 shown in Figures 1 and 3 can be extended upward so that roll paper R can be stored in the storage section 12 even when the outlet 13 is facing upward.

[0047] Furthermore, the side of the recording paper 2 that contacts the protrusion 3 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 recording paper 2 faces inward. In this case, the positions of the head 7 and transport roller 6 are reversed from those shown in Figures 1 and 3. [Explanation of symbols]

[0048] 1...roll paper printer, 2...recording paper, 2a...surface, 2b...back, 3...protrusion, 4...elastic member, 5...guide, 5a...depression, 5b...protrusion, 6...transport roller, 7...head, 8...cutter, 9...transport path, 10...cover, 12...storage section, 14...case, D1, D2...diameter, T1, T2...tension, R...roll paper.

Claims

1. a storage section capable of storing roll paper with one side of the recording paper wound on the outside; a transport roller that pulls out the recording paper from the roll paper and transports it in a transport direction; a guide having a protrusion that can come into contact with the other side of the recording paper, the guide being located upstream of the transport roller in the transport direction; a protrusion that is movable toward the guide and that is capable of contacting the one side of the recording paper upstream of the transport roller in the transport direction, the protrusion is disposed vertically above the storage portion, the protrusion is disposed vertically above the protruding portion, the transport roller is disposed vertically above the protrusion, A roll paper printer, wherein the area where the tip of the protrusion moves the recording paper toward the part of the guide is located immediately adjacent to the transport roller.

2. The roll paper printer according to claim 1 , wherein the protrusion moves in accordance with the diameter of the roll paper.

3. The roll paper printer according to claim 1 or 2, wherein a curved transport path is formed between the opposing guide and protrusion, and the curve of the transport path changes in response to movement of the protrusion.

4. The roll paper printer according to claim 1 , wherein the guide has a recess formed in a position facing the protrusion.

5. 5. The roll paper printer according to claim 1, wherein the curvature of the tip of the protrusion is equal to or greater than 0.5 mm and equal to or less than 2.2 mm.

6. 6. The roll paper printer according to claim 1, wherein at least the portion of the protrusion that contacts the one side of the recording paper is covered with a sheet containing ultra-high molecular weight polyethylene.

7. an elastic member that presses the protrusion toward the guide; 7. The roll paper printer according to claim 1, wherein the protrusion is pushed in a first direction by the elastic member, and is pushed in a second direction opposite to the first direction by tension in the recording paper.

8. A roll paper printer as described in any one of claims 1 to 7, wherein as the diameter of the roll paper becomes smaller, the area over which the recording paper abuts the protrusion increases, or the area over which the recording paper abuts the protrusion and the protrusion increases.

9. Equipped with a head, The roll paper printer according to claim 1 , wherein the head prints on the one side of the recording paper.

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