JP4802870B2 - Roll paper printer - Google Patents

Description

  The present invention relates to a roll paper printer that performs printing on a long recording paper that is unwound from a roll paper stored in a roll paper storage section in a rollable state, and in particular, in the unwinding direction in the roll paper storage section. The present invention relates to an improved technique for preventing an adverse effect resulting from a shift in the width direction of a part on the outer peripheral side of a roll paper that has been loosened.

  In a roll paper printer that prints on a long recording paper that is unwound from the roll paper stored in the roll paper storage section in a rollable state, the inertial force of the roll paper during the roll paper unwinding operation As a result, the portion of the recording paper wound around the outer periphery of the roll paper may be loosened and become loose on the outside.

  If the both sides of the roll paper storage unit are precisely defined by a flat guide surface at regular intervals, the part on the outer circumference side of the loose roll paper will be greatly displaced in the width direction and fallen into a skew state. There is no. However, when the side surface of the roll paper storage unit is not defined by a single flat guide surface and is defined by a plurality of roll paper guides, the loosely loosened roll paper is not There is a possibility that a problem occurs in that the edge of the roll paper is caught in the edge of the roll paper guide and is fed out while being bent.

  That is, when the side surface of the roll paper storage unit is defined by a plurality of roll paper guides, the left and right roll paper guide pairs arranged along the rotation direction of the roll paper (recording paper unwinding direction) The interval is set so as to be narrowed stepwise along the rotation direction of the roll paper, and the interval between the roll paper guide pair located on the most downstream side in the vicinity of the printing position is the narrowest. Thus, by narrowing the distance between the roll paper guide pairs along the recording paper feed direction, the roll paper is positioned gradually in the width direction along with the conveyance, and the width direction positioning is accurately performed. The recording paper can be fed to the printing position with.

  In this case, since the restriction in the width direction of the roll paper is loose at the upstream portion of the roll paper guide pair at a wide interval, if the outer peripheral side portion of the roll paper is loosened and loosened, it is likely to be greatly displaced in the width direction. When shifted in the width direction, the recording paper is fed in a skew state from a pair of roll paper guides with a wide interval toward a pair of roll paper guides with a narrow interval.

  A step projecting inward in the width direction of the roll paper storage section between the wide gap roll paper guide pair and the narrow gap roll paper guide pair when viewed from the front side in the recording paper feed direction. It is in a state with. Therefore, the recording paper fed out in the skew state is in a state where one edge portion thereof is applied to the step. For this reason, the edge portion of the recording paper hanging on the step may be bent and a crease may be formed. In particular, bending is likely to occur in the case of thin recording paper with a weak waist.

  Here, the positioning in the width direction of the recording paper unwound from the roll paper is generally defined by a one-side reference, that is, a guide surface on one side in the width direction. Also in this case, when the one-side reference surface is formed by a plurality of roll paper guides, the roll paper guides are arranged with a step difference of tolerance along the recording paper feed direction. Therefore, when the recording paper falls in a skew state, an edge portion is applied to the step, which may cause bending.

Conventionally, as a mechanism for preventing the recording paper unwound from the roll paper from falling into a skew state, there are those disclosed in Patent Documents 1 and 2.

In Patent Document 1, in order to regulate the position in the width direction of a roll-shaped print medium such as roll paper, a flat position regulating surface formed by a paper guide that is a single member is used. In Patent Document 2, a U-shaped frame (a pair of guide members and abutting members) is placed on the roll paper so as to be able to swing up and down, and the unwinding portion of the roll paper extends in the width direction by this frame. Prevents slippage.
JP-A-8-133540 Japanese Patent Laid-Open No. 9-255196

  The mechanism disclosed in Patent Document 1 uses a single paper guide, and recording is performed when both side surfaces of a roll paper storage unit are defined by a plurality of roll paper guide pairs and there are steps between them. It cannot be used to avoid paper skew.

  The mechanism disclosed in Patent Document 2 uses a U-shaped frame. However, in a small roll paper printer, it is often impossible to secure a space for arranging a frame having a size covering the upper side of the roll paper in the roll paper storage unit. In addition, when such a frame is put on, the conveyance resistance for unwinding the recording paper from the roll paper increases, and the fluctuation of the conveyance resistance also increases according to the state of the roll paper. For this reason, there is a problem that the feeding pitch of the recording paper fluctuates.

  In view of the above, the problem of the present invention is to prevent the skew state of the roll paper that causes the step of the roll paper guide that defines both sides of the roll paper storage portion from being caught by a simple mechanism. It is to propose a roll paper printer which can be made.

  In order to solve the above-described problems, a roll paper printer according to the present invention includes a roll paper storage unit and a position in the roll paper storage unit that can face one end surface of the roll paper stored in the roll paper storage unit. And a biasing member that biases the regulation member in a direction toward the end surface of the roll paper stored in the roll paper storage unit, and the roll paper storage unit includes: Roll paper is stored in a rollable state on the bottom surface of the roll paper storage unit, and both side surfaces of the roll paper storage unit are defined by a plurality of roll paper guide pairs. When viewed along the rotation direction of the roll paper, the interval narrows gradually as it approaches the printing position, and there is a step in the width direction of the roll paper storage section between adjacent roll paper guide pairs. The regulating member is roll paper When viewed along the rotational direction, it is characterized in that it is arranged in the vicinity of one of the paper guides in the paper guides pair farthest from the printing position.

  When the roll paper is stored in the roll paper storage unit, the regulating member disposed in the vicinity of the upstream-side widest roll paper guide pair on the upstream side faces the one end surface of the roll paper. When the recording paper is pulled out from the roll paper toward the printing position on the downstream side, the recording paper is unwound from the roll paper as it moves up and down, and the outer peripheral portion of the roll paper is loosened and loosened to the outside. Become. At both end portions of the roll paper whose position in the width direction is regulated by the roll paper guide pair having the widest spacing, the loose roll paper portions are easily displaced in the width direction.

However, the restricting member faces one end surface of the roll paper, hits the portion of the roll paper that tends to be displaced in the width direction, and restricts the lateral displacement. Accordingly, it is possible to prevent the recording paper loosened from the roll paper from being greatly displaced in the width direction. As a result, it is possible to avoid the adverse effect that the recording paper unwound from the roll paper falls into a skew state, and the edge of the recording paper is bent due to a step between the pair of roll paper guides.

  Here, the regulating member and one roll paper guide in the roll paper guide pair that is farthest from the printing position can be a common component.

  Moreover, since the diameter of the roll paper is large immediately after the roll paper is exchanged, the inertia (inertial force) is in a large state, and slack is likely to occur in the outer peripheral portion of the roll paper. Therefore, the restricting member may be disposed at a position where it can be confronted only at an outer peripheral side portion of the end surface of the roll paper stored in the roll paper storage unit.

  Further, in the present invention, when the printing position is located above the roll paper storage unit, the restriction member is disposed so as to extend in the vertical direction of the roll paper storage unit, and an upper end portion thereof is arranged. The roll paper storage unit may be swingable in the width direction, and the upper end portion may be urged inward in the width direction of the roll paper storage unit by the urging member.

  Next, in the case where an opening / closing lid for opening / closing the roll paper inlet / outlet of the roll paper storage unit is provided, the roll paper guide pair that is farthest from the printing position on the opening / closing lid, and the regulating member The biasing member can be mounted.

  In the roll paper printer of the present invention, a regulating member facing one end surface of the roll paper is arranged in a portion where the positions on both sides are defined by the widest roll paper guide pair in the roll paper storage unit. The restriction member prevents the portion of the recording paper that is unwound from the roll paper from being greatly displaced in the width direction. Therefore, it is possible to avoid the adverse effect that the recording paper to be unwound is greatly skewed and bent due to the edge of the step between the pair of roll paper guides.

  Further, since the deviation in the width direction of the roll paper is suppressed by the regulating member, the component accuracy and assembly accuracy of each roll paper guide pair can be relaxed, and the interval adjustment of each roll paper guide pair can be easily performed.

  Furthermore, since it is only necessary to arrange a regulating member having a size capable of coming into contact with the outer peripheral portion of the end surface of the roll paper in the roll paper storage unit, the installation space for the regulating member can be reduced. Therefore, there is no problem that the installation space cannot be secured or the roll paper storage unit is increased in size to secure the installation space.

  Furthermore, since it is only necessary to arrange a regulating member that is urged by the urging member, a mechanism for preventing or suppressing the skew of the roll paper can be configured easily and inexpensively, and the cost of the roll paper printer is also suppressed. it can.

  Embodiments of a roll paper printer to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of a roll paper printer to which the present invention is applied, and FIG. 2 is a schematic configuration diagram showing its internal structure. The roll paper printer 1 has a printer main body 2 and an open / close lid unit 3 (open / close lid) attached to the front surface of the printer main body 2, and an operation panel unit 4 is attached to the front end of the printer main body 2. A recording paper discharge port 5 extending in the printer width direction is formed at the upper end portion of the opening / closing lid unit 3 on the front surface of the printer.

  As shown in FIG. 1, the printer main body 2 is covered with a long box-shaped main body case 6 before and after the front and bottom surfaces are opened. On the front surface of the open / close lid unit 3, an open / close lid case 7 that defines the front surface of the printer is attached. When the operation lever 8 arranged on the operation panel unit 4 side is operated, the opening / closing lid unit 3 is unlocked by a lid lock (not shown), rotates around the lower end portion, and opens forward. When the opening / closing lid unit 3 is opened, the roll paper inlet / outlet 9a on the front side of the roll paper storage unit 9 formed inside is opened, and the roll paper 10 can be replaced. On the front surface of the operation panel unit 4, a status display lamp group 4a made of LEDs and the like, a feed button 4b, and a power switch 4c are arranged.

  As shown in FIG. 2, the roll paper 10 is stored in the roll paper storage unit 9 in a rollable state. A platen roller 11 is disposed on the upper front side of the roll paper storage unit 9, and this platen roller 11 is pressed from the lower side against the printing surface of the thermal head 12 positioned on the upper side of the printer main body 2 side. Yes. The roll paper 10 stored in the roll paper storage unit 9 is rotated in the direction indicated by the arrow A by the rotation of the platen roller 11, and the recording paper 10 a is pulled out from there while being held between the platen roller 11 and the thermal head 12. Then, it passes through the printing position B between the platen roller 11 and the thermal head 12 and is discharged from the recording paper discharge port 5 located in front of it. A scissors-type recording paper cutting device 13 is disposed in front of the recording paper discharge port 5. The recording paper cutting device 13 includes a fixed blade 14 mounted on the printer body 2 side, a movable blade 15 and a movable blade drive mechanism 16 mounted on the opening / closing lid unit 3 side. By turning the lower movable blade 15 upward, the portion of the recording paper 10a sandwiched between the two blades 14 and 15 is cut in the printer width direction.

  FIG. 3 is a partial schematic side view showing the roll paper storage unit 9. Referring to FIGS. 2 and 3, the roll paper storage unit 9 formed inside the roll paper printer 1 includes an arc-shaped bottom plate 21 extending in the printer width direction along the shape of the roll paper 10. It is surrounded by an arc-shaped top plate 22 that also extends in the printer width direction and a front plate 23 that also extends in the printer width direction.

  Further, roll paper guides 24 and 25 (only the roll paper guide 24 is shown in the figure) are arranged on both sides of the bottom plate 21. Roll paper guides 26 and 27 (only the roll paper guide 26 is shown in the figure) are also arranged on both sides of the top plate 22. Further, roll paper guides 28 and 29 are also arranged on both sides of the front plate 23. These roll paper guides 24 to 29 define both side surfaces of the roll paper storage unit 9.

  FIG. 4 is a perspective view showing the printer mechanism (the printer body 2 and the opening / closing lid unit 3) covered with the main body case 6 and the opening / closing lid case 7 of the roll paper printer 1, with the opening / closing lid unit 3 opened. Is shown.

  Referring to this figure as well, the printer main body 2 includes a base plate 41, left and right side plates 42, 43 standing upright from the base plate 41, a top plate 44, and left and right side plates 42, 43. Between the lower part of the rear side, there is provided a back plate 45 that is spanned in the printer width direction. A head mounting plate 46 is laid horizontally below the top plate 44 in the width direction of the printer. The thermal head 12 is mounted on the lower surface of the head mounting plate 46 in a substantially horizontal posture with the head surface facing downward. Yes. The top plate 22 of the roll paper storage unit 9 is disposed below the rear portion of the head mounting plate 46. The bottom plate 21 of the roll paper storage unit 9 is disposed on the upper surface of the base plate 41. Below the front end portion of the head mounting plate 46, the fixed blade 14 of the recording paper cutting device 13 is disposed forward and substantially horizontally.

  The opening / closing lid unit 3 rotates about the support shafts 51 and 52 (only one support shaft 51 is shown in FIG. 4) attached to the lower ends of the side plates 42 and 43 of the printer main body 2 and moves forward of the printer. It opens at a predetermined angle. The open / close lid unit 3 includes a front plate portion 53 and narrow side plate portions 54 and 55 that are bent at a right angle from both sides to the rear. A movable blade 15 and a movable blade drive mechanism 16 of the recording paper cutting device 13 are attached to the front surface of the front plate portion 53, and these are covered by the open / close lid case 7. The platen roller 11 is spanned over the upper end portions of the side plate portions 54 and 55 of the opening / closing lid unit 3 in a rotatable state.

  Here, the front plate 23 of the roll paper storage unit 9 is attached to the back side of the front plate portion 53. Further, roll paper guides 28 and 29 are arranged inside the side plates 54 and 55, respectively.

  Thus, the front cover 23 of the roll paper storage unit 9, the platen roller 11, and the movable blade 15 of the recording paper cutting device 13 are mounted on the opening / closing lid unit 3. In the state where the open / close lid unit 3 is closed, as shown in FIG. 2, a recording paper conveyance path is formed from the roll paper storage unit 9 to the recording paper discharge port 5 via the printing position B and the cutting position. When the opening / closing lid unit 3 is opened, as shown in FIG. 4, the roll paper storage unit 9 opens the roll paper inlet / outlet 9a, and the recording paper conveyance path opens. Therefore, when the open / close lid unit 3 is closed in a state where the recording paper 10a is pulled out from the roll paper 10 stored in the roll paper storage unit 9, the state in which the recording paper 10a is set along the recording paper conveyance path is automatically set. Can be formed.

(Roll paper guide)
FIG. 5 is a view showing the roll paper guide 29 of the roll paper storage unit 9 attached to the opening / closing lid unit 3, and FIG. 5 (a) is an explanatory view when viewed from above the printer with the opening / closing lid unit 3 opened. (B) is an explanatory view when viewed from the front of the printer with the open / close lid unit 3 closed.

  To explain with reference to these figures, one roll paper guide 29 (regulating member) attached to the opening / closing lid unit 3 is arranged along the inside of the side plate portion 55 of the opening / closing lid unit 3. When the open / close lid unit 3 is open, the roll paper guide 29 extends in the front-rear direction, and when the open / close lid unit 3 is closed, the roll paper guide 29 extends in the vertical direction on the front side of the roll paper storage unit 9.

  As shown in FIG. 5B, the roll paper guide 29 is formed with a shaft hole 29b at a middle position in the vertical direction. A support shaft (not shown) is formed on the side of the front plate 23 facing the shaft hole 29b, and the roll paper guide 29 swings in the width direction of the roll paper storage section 9 with the support shaft as a center. It is attached to the front plate 23 in a movable state. A pressure spring 30 is disposed between the roll paper guide 29 and the side plate portion 55. The holding spring 30 is positioned above the shaft hole 29 b and biases the upper end side portion of the roll paper guide 29 toward the inner side in the width direction of the roll paper storage unit 9.

  In a state in which the open / close lid unit 3 is closed, the roll paper guide 29 is continuous with the rear end surface 291 having a substantially constant width facing the back side of the printer and extending in the vertical direction, and the inner edge of the roll paper guide 29. A roll paper guide surface 292 that is inclined forward and forward, and a flat roll paper guide surface 293 that extends forward from the front edge of the roll paper guide surface 292 to the front of the printer. Since the upper end side portion is urged inward by the presser spring 30, as can be seen from FIG. 5A, when the open / close lid unit 3 is closed, the roll paper guide surface 293 is directed toward the upper end as a whole. It is slightly inclined inward.

  Further, the roll paper guide 29 faces the upper end portion of the roll paper guide surface 293 with a slight gap with respect to the outer peripheral side portion of the end surface 10 c of the roll paper 10 stored in the roll paper storage unit 9. The roll paper regulating surface 294 is arranged as described above. In particular, when the diameter of the roll paper 10 is larger, the outer peripheral side portion of the roll paper 10 moves in the width direction and hits the roll paper regulating surface 294, and when the roll paper guide 29 is pushed out sideways, the presser spring 30. Is generated, and the portion displaced in the width direction is pushed back by the spring force, so that the movement of the roll paper 10 is suppressed or prevented.

  On the other hand, the opposite roll paper guide 28 facing the roll paper guide 29 includes a flat roll paper guide surface 281 having a constant width extending in the front-rear direction of the printer and a rear end of the roll paper guide surface 281. A roll paper guide surface 282 inclined outward from the upper end portion of the edge, and is fixedly disposed inside the side plate portion 54.

  FIG. 6 is an explanatory diagram showing the positional relationship of the roll paper guides 24 to 29 of the roll paper storage unit 9. When viewed along the rotation direction A of the roll paper 10, the roll paper guides 28 and 29 on the front plate side are farthest from the print position B on the upstream side, and the roll paper guide 26 on the top plate side. 27 are located at the closest positions on the downstream side, and the roll paper guides 24 and 25 on the bottom plate side are located between them. The interval W1 between the roll paper guides 26, 27 closest to the print position B is the narrowest, and the roll paper guides 26, 27 unwind the roll paper 10 and position the recording paper 10a toward the print position B in the width direction. It is designed to be performed with high accuracy.

  On the other hand, the roll paper guides 24 and 25 arranged on the near side are arranged at positions slightly retracted outward in the width direction of the roll paper storage unit 9 from the roll paper guides 27 and 28, respectively. These intervals W2 are slightly wider than the intervals W1. By feeding the recording paper 10a to the narrow paper roll guides 26 and 27 via the wide paper roll guides 24 and 25, the recording paper 10a can be positioned smoothly in the width direction. Yes.

  On the other hand, of the roll paper guides 28 and 29 located farthest from the printing position, one roll paper guide 28 is slightly retracted to the outside in the width direction of the roll paper storage unit 9 compared to the roll paper guide 24. Is arranged. On the other hand, the roll paper guide 29 on the opposite side is set so that the portion of the roll paper guide surface 293 corresponding to the swing center 29a is slightly retracted outward as compared to the roll paper guide 25. Has been. Therefore, these intervals W3 are the widest intervals. However, the roll paper regulating surface 294 above the swing center 29 a in the roll paper guide 29 is inclined inward, and the upper end portion thereof is at the same position as the guide surface of the roll paper guide 27.

(Regulatory action by roll paper guide)
With reference to FIG. 6, the skew feeding restricting operation of the recording paper 10a by the roll paper guide 29 will be described. When the recording paper 10 a is conveyed by the platen roller 11, the recording paper 10 a is pulled out while the roll paper 10 rotates in the direction of arrow A. The roll paper 10 cannot follow the rotation and stop according to the conveyance and stop of the recording paper 10a due to its inertial force, resulting in an operation delay. In particular, when the conveyance is stopped, the roll paper 10 cannot be stopped immediately and continues to rotate, so that the recording paper 10a is excessively unwound. This tendency becomes more remarkable as the diameter of the roll paper 10 is larger. When such a state is repeated, the portion of the recording paper 10a wound around the outer periphery of the roll paper 10 becomes loosened and loosened. When the recording paper 10a is sent out in this state, the loosened portion of the recording paper 10a is displaced in the width direction, and there is a possibility of falling into a skew state as indicated by an imaginary line 10A in FIG.

  That is, at the position between the roll paper guides 28 and 29 having a wide interval, the outer peripheral side portion of the roll paper 10 may be largely shifted in the slack width direction. Since the position in the width direction of the front portion of the recording paper 10a is regulated by the roll paper guides 26 and 27 having a narrow interval, if the rear portion is shifted in the width direction, the recording paper 10a falls into a skew state. There is a fear.

  However, in this example, of the roll paper guides 28 and 29 arranged on the most front side in the feeding direction of the recording paper 10a, one of the roll paper guides 29 is movable in the width direction and is supported by the pressing spring 30. The upper end side of the roll paper regulating surface 294 faces the outer peripheral side portion of the roll paper 10 at a slight interval. Therefore, when the recording paper 10 a on the outer peripheral side portion of the roll paper 10 is loosened and shifted in the width direction, the portion hits the roll paper regulating surface 294 of the roll paper guide 29.

  When the roll paper regulating surface 294 is pushed outward in the width direction, the roll paper guide 29 swings around its swing center 29 a, and the holding spring 30 supporting it bends to push back the roll paper guide 29. . As a result, the roll paper regulating surface 294 is pressed against the end surface of the roll paper 10, and the recording paper 10a is prevented or suppressed from greatly deviating in the width direction. Therefore, the recording paper 10a falls into a skewed state as indicated by an imaginary line 10A. For example, as shown by the dashed lines C and D in FIGS. 3 and 6, the step between the roll paper guides 28 and 24, or the roll paper. There is no problem that the step of the guides 24 and 26, that is, the edge of the recording paper 10a is applied to the edge of the roll paper guide 24 or 26, and the crease is formed.

  Note that the roll paper regulation surface 294 of the roll paper guide 29 only faces the outer peripheral side portion of the roll paper 10. Therefore, when the roll paper 10 is consumed and its diameter is reduced, the end face 10b of the roll paper 10 is removed from the roll paper regulating surface 294. However, the phenomenon in which the recording paper 10a is loosened and is displaced in the lateral direction occurs at an initial time when the inertial force of the roll paper 10 is large. Therefore, such an adverse effect does not occur after the roll paper 10 is consumed and has a small diameter. Therefore, there is no problem that the end face of the roll paper hits the roll paper regulating surface 294 unnecessarily and the conveyance resistance is increased and the paper feed accuracy is lowered.

  Further, in this example, one of the roll paper guides 28 and 29 arranged at the widest interval is extended upward so that it can be swung in the width direction of the roll paper storage unit 9, and the presser spring The roll paper is urged inwardly by 30 and a roll paper regulating surface 294 is formed at the upper end portion of the roll paper guide 29 to prevent the roll paper from skewing. As described above, since the roll paper guide and the regulating member for preventing the skew of the roll paper are used as a common part, the skew prevention mechanism can be simply configured and the installation space can be reduced.

  Further, when the roll cover unit 3 is closed, for example, when the roll paper is replaced, it is necessary to put the roll paper 10 between the roll paper guide 28 and the upper end portion of the roll paper guide 29 having a narrow interval. In this example, the roll paper guide surfaces 281 and 292 are formed, and the roll paper can be easily put between them, so when closing the open / close lid unit 3, the roll paper hits these portions, There is no adverse effect that the opening / closing lid unit cannot be smoothly closed.

1 is an external perspective view of a roll paper printer to which the present invention is applied. It is a schematic block diagram which shows the internal structure of a roll paper printer. It is a partial schematic side view which shows a roll paper accommodating part. It is a perspective view which shows a printer mechanism part. It is explanatory drawing which shows a roll paper guide and its attachment part. It is explanatory drawing which shows the control operation | movement of the roll paper by the roll paper control surface of a roll paper guide.

Explanation of symbols

1 roll paper printer, 2 printer body, 3 lid opening / closing unit, 5 recording paper discharge port, 6
Main body case, 7 Lid case, 9 Roll paper storage section, 10 Roll paper, 10a Recording paper, 10b, 10c End face, 10A Inclined recording paper, 11 Platen roller, 12 Thermal head, 21 Bottom plate, 22 Top plate, 23 Front plate, 24, 25 Roll paper guide, 26, 27 Roll paper guide, 28, 29 Roll paper guide, 292 Roll paper guide surface, 293 Roll paper guide surface, 294 Roll paper regulating surface, 29a Center of swing, 30 Pressing spring , 41 Base plate, 42, 43 Side plate, 44 Top plate, 53 Front plate portion, 54, 55 Side plate portion, A Roll paper rotation direction, B printing position, C, D step, W1-W4 spacing

Claims (5)

A roll paper storage section;
In this roll paper storage unit, a regulating member arranged at a position that can face one end surface of the roll paper stored in the roll paper storage unit,
A biasing member biasing the regulating member in a direction toward the end face of the roll paper stored in the roll paper storage unit;
The roll paper storage unit stores roll paper in a rollable state on the bottom surface of the roll paper storage unit, and both side surfaces of the roll paper storage unit are defined by a plurality of roll paper guide pairs. The distance between each pair of roll paper guides, when viewed along the rotation direction of the roll paper, gradually decreases as the printing position is approached. Between the adjacent roll paper guide pairs, the width of the roll paper storage section There is a step in the direction,
The roll is characterized in that the regulating member is disposed in the vicinity of one roll paper guide in the roll paper guide pair that is farthest from the printing position when viewed along the rotation direction of the roll paper. Paper printer. In claim 1,
A roll paper printer, wherein the regulating member and one roll paper guide in the roll paper guide pair farthest from the printing position are formed from a common component. In claim 1 or 2,
The roll paper printer, wherein the restricting member is disposed at a position that can be confronted only at an outer peripheral side portion of an end face of the roll paper stored in the roll paper storage unit. In claim 3,
The printing position is located above the roll paper storage unit,
The regulating member extends in the up-down direction of the roll paper storage unit, and an upper end portion thereof can swing in the width direction of the roll paper storage unit,
The roll paper printer, wherein the biasing member biases the upper end portion inward in the width direction of the roll paper storage unit. In claim 4,
An open / close lid for opening and closing a roll paper outlet / outlet of the roll paper storage unit;
The roll paper printer, wherein the roll paper guide pair, the regulating member, and the urging member that are farthest from the printing position are mounted on the opening / closing lid.

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