JP2013043764A - Paper feed structure of printer with curling preventing mechanism of roll paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent, in a portable small printer, a sheet printed and discharged from being rolled by keeping the radial dimension of an outer circumferential portion drawn from a rolled portion of roll paper constant, and folding the printed roll paper or leveling the printed roll paper.SOLUTION: A shaft bar 10 attached to a rolled portion 21 of roll paper 2 housed in a case 4 presses the inner circumferential surface of paper closest to the center of the rolled portion 21, while a central portion in short-side direction of a pulled portion 22 of the roll paper 2 is pressed by a protruding portion 11a protruded in a reversed triangular shape of a paper presser unit 11 which is disposed in the case 4 so as to be located above the roll paper 2. An outlet opening 3 opened to the case 4 is composed of a central opening portion 31 having upper and lower opening edges of the same shape as the side having the protruding portion 11b of the paper presser unit 11, and folding margin forming opening portions 32 relatively gently inclined upward from both sides of the central opening portion 31.

Description

  The present invention relates to a paper feeding structure of a printing apparatus that uses roll paper as printing paper, and more particularly to a paper feeding structure of a small portable printing apparatus.

  In a small portable printing apparatus, for example, as shown in Patent Document 1 or the like, coreless roll paper may be used. At least in such coreless roll paper, the roll portion of the roll paper As the outer periphery approaches the center side of the roll part, the diameter of the outer surface of the roll paper becomes relatively small, and the curl of the part drawn from the roll part tends to become stronger. In this case, when printing a sheet that informs the customer of the electricity meter reading result etc. with a small portable printing device and posting it on a mailbox etc., it was printed on the roll paper in a state approaching the center side of the roll part In addition, the sheet from which the roll paper is cut is also rounded. In this way, when a rounded sheet is posted, it is inconvenient for the customer to view information such as the meter reading result of the electric energy written on the sheet, and furthermore, the posted sheet has become rounded and small. There is also a risk of being misled by other mail items.

  In order to prevent the problem of the rolled sheet being rounded, there are a method of replacing the roll paper when the outer peripheral side of the roll part is close to the center side of the roll part to some extent, and a method of manually attaching a crease to the printed sheet. Although it is possible, it is uneconomical to replace the roll paper with the remainder as in the former, and it is too complicated to manually crease all printed sheets like the latter. It is impossible.

  In this regard, the roll paper feeding device and the image recording apparatus disclosed in Patent Document 2 are configured to include a correction mechanism that corrects curl by applying iron to the roll paper. That is, the curl correction mechanism of the roll paper feeding device and the image recording device is provided with a torque limiter using the internal pressure of the spring between the spool and the collar for setting the roll paper, and the load (torque) applied to the roll paper. It is intended to correct the roll paper curl by keeping the constant.

JP 2001-139192 A JP 9-328247 A

  However, the roll paper feeding device and the image recording device disclosed in Patent Document 2 are intended to correct the curl of the roll paper while keeping the load applied to the roll paper constant with a simple mechanism. Since the diameter of the outer periphery of the roll portion becomes relatively smaller as the outer peripheral side approaches the center side of the roll portion, it does not deal with the problem that the curl of the pull-out portion of the roll paper tends to become stronger.

  Further, in the roll paper feeding device and the image recording device disclosed in Patent Document 2, effective means for preventing the rolled sheet from being rounded before the exit of the printed roll paper to the outside of the printing device. Neither a structure for making a crease in the roll paper nor a structure for leveling the curl of the roll paper is shown.

  Therefore, the present invention can keep the maximum outer diameter dimension of the roll portion of the roll paper constant even when the roll amount of the roll portion is reduced, and the printed roll paper is creased or printed. It is an object of the present invention to provide a paper feeding structure for a printing apparatus with a roll paper curl prevention mechanism that can smooth the sheet and prevent the sheet to be thrown from curling.

  In the paper feeding structure of a printing apparatus with a roll paper curl prevention mechanism according to the present invention, a roll paper having a roll portion formed by winding a plurality of print paper and a drawer portion drawn out from the roll portion is housed in a case. The case has an opening for taking out the printed roll paper to the outside, and the case further includes a roll paper in which a roller for guiding the drawing portion of the roll paper to the take-out port is accommodated. In the paper feeding structure of the printing apparatus with a curl prevention mechanism, a shaft rod extending in the axial direction of the roll portion is attached to the center side of the roll portion of the roll paper, and the shaft rod is attached to the roll portion of the roll paper. The inner peripheral surface of the most central paper is pressed outward in the radial direction, and the central portion in the width direction of the roll paper pull-out portion is pressed by a protruding portion protruding downward. The press part is housed in the case so as to be above the roll paper, and the take-out port is a central port provided with upper and lower opening edges having the same shape as the side having the protruding part of the paper press part. And a folding margin forming mouth portion that is relatively gently inclined upward from both sides of the central mouth portion (claim 1). As the roll paper, it is preferable to use a coreless roll paper without a core so that a shaft rod of another member can be inserted. The printing device is preferably a small portable device. And the protrusion shape of the protrusion part of a paper holding | suppressing part is an inverted triangle shape, for example.

  As a result, the shaft rod mounted at the center of the roll portion of the roll paper is continuously pressed from the center of the roll portion toward the outer periphery side by the pressing portion that extends for a while on the innermost peripheral side of the roll portion. Even if the winding amount of the part is reduced, the inner diameter of the innermost part of the roll part is expanded, and the maximum outer diameter of the roll part can be kept substantially the same. In addition, the roll paper pull-out portion is pressed and leveled from the direction opposite to the direction of rounding by the protruding portion of the paper pressing portion up to the take-out port of the case, and is creased at the center in the horizontal width direction. Furthermore, the roll paper drawer portion is also creased on both sides in the width direction by the crease portion of the take-out port when passing through the case take-out port, and is formed by the paper pressing portion by the central mouth portion of the take-out port. It will not get caught at the folds.

  In the paper feeding structure of the printing apparatus with a roll paper curl prevention mechanism according to the present invention, the pressing portion of the shaft rod contracts to the center side of the shaft rod by operating the operation portion of the operation mechanism. It has a structure (claim 2). Operating the operation unit of the operation mechanism means, for example, pushing the operation unit to cause the operation unit to enter the cavity of the shaft rod body of the shaft rod. Thereby, at the initial stage of the roll paper, the inner diameter of the cavity at the center of the roll part is relatively small, but the shaft rod can be inserted and installed without difficulty in the cavity of the roll part.

  In the paper feeding structure of the printing apparatus with a roll paper curl prevention mechanism according to the present invention, the roll paper pull-out portion is positioned forward or backward in the pull-out direction of the roll paper pull-out portion with respect to the roller. It further has a roller for guiding to the take-out port (claim 3). Thereby, the drawer | drawing-out part pulled out from the roll part of roll paper can be reliably guided to the taking-out opening of a case. In particular, it is possible to weaken the curl of the roll paper by winding the drawn portion of the roll paper in the direction opposite to the direction of the curl with this roller.

  As described above, according to the present invention, the innermost peripheral side of the roll part of the roll paper is continuously pressed from the center of the roll part toward the outer peripheral side by the pressing part that is extended for a while. Even if the winding amount of the part decreases, the inner diameter dimension of the innermost side of the roll part can be expanded and the substantially same dimension can be maintained with respect to the maximum outer diameter dimension of the roll part. , And the outer diameter of the roll portion does not become relatively small. Therefore, it is possible to prevent the roll paper from becoming strongly curled due to a decrease in the amount of roll paper. For this reason, when the roll amount of the roll portion of the roll paper is relatively reduced, it is necessary to replace the roll paper even though there is a remaining amount in the roll portion in order to prevent the sheet that has been printed and separated from curling. It is possible to reduce the cost.

  Further, according to the present invention, the roll paper pull-out portion is pressed from the direction opposite to the curling direction by the protruding portion of the paper pressing portion up to the case outlet, and the folding surface is formed at the center in the horizontal width direction. In addition, when passing through the outlet of the case, a fold surface is attached to the center in the width direction by the central mouth portion of the outlet port, and creases are made on both sides in the width direction by the fold portion of the outlet port. This eliminates the need to crease after taking out the sheet from the take-out port.

  Therefore, when the roll paper drawer is cut into a sheet, it becomes difficult to curl, and when posting to a mailbox, it becomes difficult to read the information printed on the sheet, or it is confused with other postal items. The risk of getting stuck is reduced.

  In particular, according to the second aspect of the present invention, at the initial stage of the roll paper, the central cavity of the roll portion has a relatively small inner diameter, but the shaft rod provided with a pressing portion in the roll portion cavity can be used without difficulty. Since it can be inserted and mounted, it is possible to easily mount the shaft rod on the roll portion of the roll paper.

  In particular, according to the third aspect of the present invention, the drawer portion pulled out from the roll portion of the roll paper can be reliably guided to the outlet of the case. In addition, the roll paper curl can be weakened by winding the roll paper pull-out portion around the roller in the direction opposite to the roll paper curl direction.

FIG. 1 is a schematic diagram for explaining an example of a paper feeding structure of a printing apparatus with a roll paper curl prevention mechanism according to the present invention. FIG. 2 is a perspective view of a shaft rod constituting the paper feed structure of the printing apparatus with the roll paper curl prevention mechanism, and FIG. 2 (a) shows the shaft rod on the inner periphery of the roll portion of the roll paper. FIG. 2B shows a state where the pressing portion contracts so that the shaft rod can be easily mounted in the cavity of the roll portion of the roll paper. FIG. 3 is a cross-sectional view of a shaft rod constituting the paper feed structure of the printing apparatus with a roll paper curl prevention mechanism of the above, and FIG. 3 (a) corresponds to FIG. 2 (a). FIG. 3B shows a configuration in which the pressing portion expands radially outward in order to press the inner periphery of the roll portion of the paper. FIG. 3B corresponds to FIG. The structure which a press part shrink | contracts to radial inside so that it may be easy to mount | wear with a cavity is shown. FIG. 4 is a cross-sectional view taken along line AA in FIG. 1 for explaining the shape of the protruding portion of the paper pressing portion constituting the paper feed structure of the printing apparatus with the roll paper curling prevention mechanism. is there. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 1 for explaining the opening shape of the take-out port constituting the paper feed structure of the printing apparatus with the roll paper curling prevention mechanism. FIG. 6 shows a paper feed structure of a printing apparatus with a roll paper curl prevention mechanism having a different roller arrangement as another example of the paper feed structure of the roll paper curl prevention mechanism with the roll paper shown in FIG. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration of an example of a printing apparatus 1 in which the present invention is used. This printing apparatus 1 is a small portable device, and uses a coreless type roll paper 2 as printing paper. After printing information such as a power reading result on the roll paper 2, the printing apparatus 1 is used. Then, the sheet can be drawn out from the take-out port 3 and cut into an appropriate length to create a sheet such as a power amount notification sheet for the customer.

  In this embodiment, the printing apparatus 1 includes a roll paper storage unit 5 for storing the roll paper 2 in the case 4, a printing unit 6 that performs printing on a later-described drawer portion 22 of the roll paper 2, and A roller 7 for guiding the printed drawer portion 22 to the outlet 3 and a cutter device 8 for cutting the drawer portion 22 drawn from the outlet 3 to an appropriate length are provided.

  Among these, the case 4 is formed of, for example, a resin material such as plastic, or a metal material such as iron or aluminum, and a bottom surface 41 on which the roll paper storage unit 5 is placed and an opening facing the bottom surface 41. 42, and a cover 4b that is connected to the case body 4a via a hinge 43 so as to be movable in a direction closer to the case body 4a to open and close the opening 42. Yes.

  The printing unit 6 includes a thermal head 61 and a platen roller 62, for example.

  The thermal head 61 has a number of heating elements (not shown) in the width of the drawer portion 22 of the roll paper 2 in the short direction, and these heating elements are controlled by a control signal from a control unit (not shown). Each is controlled so as to generate heat. In this way, by controlling the heat generation of the heat generating element, it is possible to print various characters and figures on the lower surface of the drawer portion 22. The thermal head 61 is biased toward the platen roller 62 by an elastic mechanism such as a coil spring (not shown).

  The platen roller 62 is disposed on the cover 4b side so that the outer peripheral surface of the platen roller 62 is in contact with the thermal head 61 with the drawer portion 22 in between. The platen roller 62 is made of an elastic material such as rubber. Yes. A driven gear (not shown) is fixed to one end of the platen roller 62, and this driven gear meshes with a gear of a gear mechanism (not shown) that is rotated by a step motor or the like. Thereby, the rotational force output from the step motor is transmitted from the gear of the gear mechanism to the driven gear, the platen roller 62 rotates, and the drawer portion 22 can be sent out to the take-out port 3 side. The step motor is also controlled by a control signal from the control unit (not shown).

  And the cutter device 8 is arrange | positioned outside the extraction port 3 of the case main body 4a in this Example. Further, in this embodiment, the cutter device 8 includes a cutting blade 81 disposed on the cover 4b side with respect to the take-out port 3, and a cutting blade 82 disposed on the bottom surface 41 side of the case body 4a with respect to the take-out port 3. Consists of confronting. Here, the cutting blade 81 is a fixed blade, and the cutting blade 82 is overlapped with the cutting blade 81 toward the base side of the cutting blade 81 by a motor (not shown) driven based on a control signal from a control unit (not shown). It may be a movable blade that slides. Thereby, it becomes possible to appropriately cut the drawer portion 22 of the roll paper 2 so as to automatically become a sheet. The cutting blade 82 may be a fixed blade, and the cutting blade 81 may be a movable blade that slides toward the cutting blade 81 with a driving force from a motor.

  Incidentally, the printing apparatus 1 has a paper feed structure with a roll paper curl prevention mechanism. An example of the paper feed structure with the roll paper curling prevention mechanism is shown in FIGS. 1 to 5. The shaft 10 mounted on the roll portion 21 of the roll paper 2, and the printing unit 6 to the roller 7. The paper pressing portion 11 arranged in the range up to the above, the roller 7 separately from the roller 7, and the opening shape of the take-out port 3 are formed.

  Among these, as shown in FIGS. 2 and 3, the shaft rod 10 is a columnar shaft body 101 having an axial dimension substantially the same as the axial dimension of the roll paper 2, and a circle of the shaft rod body 101. A plurality of (8 in this embodiment) pressing portions 102 extending radially from the peripheral surface and an operation mechanism 103 for operating the pressing portions 102 are provided.

  As shown in FIG. 3, the shaft rod main body 101 has a cavity 104 inside, and an opening 105 communicating with the cavity 104 is formed at one end in the longitudinal direction. 106 can slide into and out of the cavity 104 from the opening 105, and a pulling cable 111 and an elastic mechanism 110 of the operation mechanism 103 described later are also housed in the cavity 104.

  Each pressing portion 102 includes a base portion 107 protruding from the side surface of the shaft bar main body 101 and a pressing main body 108. The base portion 107 is formed integrally with the shaft rod main body 101, and as shown in FIG. 3, the upper portion is opened so that the standing wall portion 108 a of the pressing body 108 can protrude and retract in the radial direction of the shaft rod 10. Yes. As shown in FIG. 3, the pressing body 108 is formed by integrally forming a standing wall portion 108 a inserted into the opening of the base portion 107 and a pressing plate 108 b disposed at the tip of the standing wall portion 108 a. ing. An elastic member 109 made of a coil spring or the like is interposed between the standing wall portion 108a of the pressing body 108 and the bottom surface of the base portion 107 in the opening of the base portion 107, as shown in FIG.

  Accordingly, in a normal time when the operation unit 106 is not operated, the standing wall portion 108a of the pressing body 108 is pressed by the urging force of the elastic member 109, and the pressing plate 108b of the pressing body 108 is outside the pressed body (roll The roll portion 21) of the paper 2 can always be pressed in the direction of the arrow in FIG. Note that the urging force by the elastic member 109 may be changed according to the winding amount of the roll portion 21 without making it constant. Further, the pressing plate 108b of the pressing body 108 is curved, and the curvature is circular when all the pressing plates 108b are in contact with each other when the adjacent pressing plates 108b come into contact with each other as shown in FIG. It is good also as what forms a ring.

  The operation mechanism 103 includes a columnar operation portion 106 that is mostly accommodated in the cavity 104 of the shaft rod body 101, and is accommodated on the opposite side to the opening 105 side in the cavity 104 of the shaft rod body 101. The elastic mechanism 110 urges the portion 106 in the direction of pushing the portion 106 outward from the opening portion 105, and the pulling cable 111 connecting the shaft main body 101 and the pressing main body 108 of the pressing portion 100. In this embodiment, as shown in FIG. 3, one end of the pulling cable 111 is connected to the inner surface of the pressing plate 108 b of the pressing main body 108, and the middle portion is formed at the bottom of the base 107. The other end of the shaft rod 10 is connected to the side surface of the shaft rod body 101 through a through hole communicating with the cavity 104 of the shaft rod 10.

  As a result, as shown in FIG. 3B, when the operation unit 106 of the operation mechanism 103 is pushed in the direction of the white arrow, the operation unit 106 moves inside the cavity 104 of the shaft 10 and the elastic member 109. Since the sliding cable 111 slides toward the elastic member 109 against the urging force, the connecting portion of the pulling cable 111 to the operation unit 106 is also displaced toward the elastic member 109. Therefore, the pulling cable 111 is thick as shown in FIG. As shown by the direction of the arrow, the pressing plate 108b of the pressing body 108 is pulled toward the base 107 side. For this reason, the standing wall portion 108a of the pressing body 108 is also housed in the base 107 against the urging force of the elastic member 109, and the entire pressing portion 102 contracts.

  Therefore, when the shaft 10 is mounted in the cavity located at the center of the roll portion 21 of the roll paper 2, the operation of pushing the operation unit 106 of the operation mechanism 103 in the direction of the white arrow in FIG. Done. Thus, the standing wall portion 108a constituting the pressing body 108 of the shaft rod 10 is accommodated in the shaft rod body 101 of the shaft rod 10, so that the other pressing force is applied from the pressing plate 108b of one pressing body 108 of the shaft rod 10. Since the maximum dimension L2 of the main body 108 up to the pressing plate 108b is equal to the inner diameter dimension of the cavity located at the center of the roll portion 21, the shaft rod 10 is easily inserted into the roll portion 21 of the roll paper 2 and attached. Can do. Here, the action of returning to the original position by the urging force from the elastic mechanism 110 acts on the operation unit 106 only by releasing the hand from the operation unit 106. Of course, although not shown, the operation mechanism 103 may be provided with a lock release device that releases the movement of the operation unit 106 in the direction of the white arrow.

  However, the shaft rod 10 mounted on the roll portion 21 of the roll paper 2 increases the amount of protrusion of the standing wall portion 108b of the pressing portion 102 from the shaft rod main body 101 as the winding amount of the roll portion 21 decreases. The maximum dimension L1 from the pressing plate 108b of one pressing body 108 to the pressing plate 108b of the other pressing body 108 also increases for a while. For this reason, even if the winding amount of the roll part 21 decreases, the inner diameter of the innermost side of the roll part 21 increases, while the maximum outer diameter of the roll part 21 becomes substantially constant from the beginning. Therefore, the maximum outer diameter dimension of the roll portion 21 does not become smaller as the winding amount of the roll portion decreases, and the winding wrinkles of the pull-out portion 22 drawn out from the roll portion 21 become stronger due to the reduction of the winding amount of the roll portion 21. It will never be.

  Further, as shown in FIG. 1, the paper pressing portion 11 is positioned closer to the takeout port 3 than the printing unit 6, and the end on the takeout port 3 side is substantially coincident with the roller 7. In the case 4. In this embodiment, the paper pressing portion 11 is positioned above the drawer portion 22 of the roll paper 2 and is provided on the cover 4b side of the case 4 so that it can be easily pressed using a force for closing the cover 4b. Although attached, you may attach to the case main body 4a side. And this paper holding | suppressing part 11 has the protrusion part 11a which protruded in the reverse triangle shape toward the approximate center side of the transversal direction of the drawer | drawing-out part 22 of the roll paper 2, as FIG. 4 shows.

  However, as shown in FIG. 4, the pull-out portion 22 of the roll paper 2 is pressed in the direction opposite to the direction in which the roll paper 2 is curled by the lower side surface or the top of the protruding portion 11 a of the paper presser 11 to equalize the roll paper. In addition, the drawer portion 22 can be creased by the protruding portion 11a.

  However, the structure for the shaft rod 10 to press the innermost peripheral side of the roll portion 21 of the roll paper 2 is not limited to the above-described one. For example, although not shown, a circular shape is provided on the side circumferential surface of the shaft rod main body 101. A plurality of arc-shaped plate bodies are mounted in a spiral shape or a propeller shape, and in the normal state, the innermost side of the roll portion 21 is pressed with the tip of the plate body in a state where the plate body is expanded, and the operation unit 106 is pressed. A structure may be adopted in which the plate bodies are gathered on the shaft rod main body 101 side and contracted so that the maximum outer diameter including the plate body of the shaft rod 10 is substantially the same as the inner diameter size of the cavity of the roll portion 21.

  Furthermore, the roller 12 is arrange | positioned rather than the existing roller 7 at the extraction port 3 side, as FIG. 1 shows. In this embodiment, the roller 12 is positioned lower than the roller 7 in response to the opening position of the take-out port 3 being lower than the position of the roller 7. As a result, the drawer portion 22 of the roll paper 2 that has passed through between the paper pressing portion 11 and the roller 7 is lowered to the roller 12 side, and is sent to the takeout port 3 side around the lower circumference of the roller 12. Since the drawn portion 22 of the roll paper 2 is wound by the roller 12 in the direction opposite to the direction of the curl, the curl of the drawn portion 22 of the roll paper 2 becomes relatively weak.

  As shown in FIG. 5, the take-out port 3 forms an opening shape with a central port portion 31 and folding margin forming port portions 32 on both sides thereof. Among these, the center port portion 31 of the take-out port 3 is configured to have an upper edge S2 and a lower edge S3 having substantially the same shape as the lower triangle S1 of the inverted triangle shape of the protruding portion 11a of the paper pressing portion 11. Further, the folding margin forming opening 32 has a shape that is relatively gently inclined upward from both sides of the central opening 31.

  However, when the drawer portion 22 of the roll paper 2 passes through the take-out port 3, the fold formed by the paper pressing portion 11 is not caught on the opening edge of the take-out port 3 due to the central port portion 31. In addition, even at the take-out port 3, the drawer portion 22 of the roll paper 2 is pressed and leveled in a direction opposite to the direction in which the roll paper 2 is wound, and the crease line is further bent with respect to the center of the drawer portion 22 in the short direction. Can be attached reliably. Further, when the drawer portion 22 of the roll paper 2 passes through the take-out port 3, the folding edge forming port portion 32 is provided so that both side ends of the drawer portion 22 can be bent upward.

  As described above, the printing apparatus 1 has a paper feed structure with a roll paper curl prevention mechanism that includes the shaft rod 10, the paper pressing portion 11, the roller 12, and the opening shape of the take-out port 3. Thus, the roll paper 2 does not become strongly curled until it is pulled out from the roll portion 21, and the pull-out portion 22 is also wound when passing through the paper pressing portion 11, the roller 12, and the take-out port 3. Since the wrinkles are leveled or wound in the opposite direction, the creases are made, or both ends are bent, so that the drawer portion 22 is not easily rounded even if it is cut by the cutter device 8 to form a sheet. Is possible.

  FIG. 6 shows a modified example of a paper feed structure with a roll paper curl prevention mechanism. Hereinafter, a modified example of the paper feeding structure with the roll paper curling prevention mechanism will be described with reference to FIG. However, since the configuration is substantially the same as that of the previous embodiment, the description of the configuration will be omitted by assigning the same reference numerals, and the following description will be focused on the arrangement of the rollers 7 and 12.

  The roller 12 is disposed on the printing unit 6 side with respect to the roller 7 and at the same height as the roller 7. Accordingly, the roller 7 is arranged at a position closer to the take-out port 3 than the roller 7 shown in FIG. However, since the roller 12 and the roller 7 are located at the same height, the drawing portion 22 of the roll paper 2 is not wound by the roller 12, and the drawing portion 22 may be curled by the roller 12. Can be eliminated.

  Therefore, even in the modified example of this embodiment, the roll paper 2 does not become strongly curled until it is pulled out from the roll portion 21, and the pull-out portion 22 also includes the paper pressing portion 11, the roller 12, and the take-out portion. When passing through the mouth 3, it is smoothed or wound in the direction opposite to the direction in which the curl is present, or creased or bent at both ends, so the drawer portion 22 is cut by the cutter device 8 and the sheet Even if it becomes, it is possible to make it hard to curl.

DESCRIPTION OF SYMBOLS 1 Printing apparatus 2 Roll paper 3 Taking out port 4 Case 7 Roller 8 Cutter device 10 Axis stick 11 Paper holding part 11a Paper holding part protrusion part 12 Roller 21 Roll paper roll part 22 Roll paper drawer part 31 Central opening of taking-out opening Part 32 Folding allowance forming part 101 Shaft bar main body 102 Pressing part 103 Operating mechanism 104 Shaft bar main body cavity 105 Shaft bar main body opening 106 Operating part 107 Base 108 Pressing main body 108a Standing wall part 108b Push plate 109 Elastic member 110 Elastic mechanism 111 Cable for pulling

Claims (3)

A roll paper having a roll portion formed by winding a plurality of printing papers and a drawer portion drawn out from the roll portion is housed in a case, and this case has an outlet for taking out the printed roll paper to the outside. In the paper feeding structure of the printing apparatus with a roll paper curl prevention mechanism in which a roller that opens and further guides the roll paper drawer portion to the take-out port is housed in the case.
A shaft rod extending in the axial direction of the roll portion is arranged on the center side of the roll portion of the roll paper, and the shaft rod is arranged so that the inner peripheral surface of the most central paper of the roll portion of the roll paper is radially outward. Having a pressing part that presses toward
While storing the paper pressing part that presses the central part in the width direction of the drawer part of the roll paper with a protruding part protruding downward in the case so as to be higher than the roll paper,
The take-out port has a central mouth portion having an opening edge having the same shape as the side having the protruding portion of the paper pressing portion, and a folding margin that is relatively gently inclined upward from both sides of the central mouth portion. A paper feeding structure of a printing apparatus with a roll paper curling prevention mechanism, characterized by comprising a mouth portion.   2. The roll paper curling prevention according to claim 1, wherein the pressing portion of the shaft rod has a contraction structure that contracts toward a center side of the shaft rod by operating an operation portion of an operation mechanism. Paper feed structure of printing device with mechanism.   The roller for guiding the drawer part of the roll paper to the take-out port is further provided in front of or behind the drawer direction of the roll paper drawer part with respect to the roller. A paper feed structure of a printing apparatus with a roll paper curl prevention mechanism according to 2.

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