JP2014037294A - Roll paper supply device and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a roll paper supply device capable of simply and accurately adjusting the positions of side guides for regulating a paper width direction of continuous paper extracted from roll paper.SOLUTION: A roll paper supply device 3 has a roll paper storing part 12 for storing roll paper 11 for winding continuous paper 11a for printing, and side guides 20, 21 for regulating edge positions in the paper width direction of the continuous paper 11a extracted from the roll paper 11 stored in the roll paper storing part 12. The side guides 20, 21 are slidable in a paper width direction and can be brought into contact with the edge faces of the roll paper 11 of the roll paper storing part 12 when slid in the paper width direction. The positions of the side guides 20, 21 can be accurately adjusted without damaging edges of the extracted continuous paper 11a by a simple operation of bringing the side guides 20, 21 into contact with the edge faces of the roll paper 11.

Description

  The present invention relates to a roll paper supply device and a printer including the roll paper supply device. More specifically, the present invention relates to a side guide that regulates an end position in a sheet width direction of a continuous sheet that is pulled out and conveyed from roll paper.

  As a roll paper supply device, one having a side guide for guiding a continuous paper drawn from the roll paper accommodated therein is known. The side guides regulate the end positions on both sides in the paper width direction of the continuous paper drawn from the roll paper. As a result, the continuous sheet is sent out toward the printing position of the printer along the predetermined conveyance path without falling into a skew state or the like.

  Since roll paper has various paper widths, it is necessary to adjust the position of the side guide in the paper width direction according to the paper width of the continuous paper drawn from the roll paper. When the width between the side guides is set narrower than the sheet width, an excessive restriction force acts on the sheet edge of the continuous sheet, and the sheet edge may be damaged. If the width between the side guides is too wide, the paper edge position of the conveyed continuous paper cannot be accurately regulated, skewing of the continuous paper occurs, paper jams, printing misalignment, etc. Bad effects occur.

  In the print medium support device disclosed in Patent Document 1, movable left and right width regulation guides that regulate the position in the width direction of the roll paper are arranged in a winding unit that stores the roll paper. In addition, movable left and right width regulation guides (side guides) that regulate the position in the width direction of the roll paper drawn from the winding unit are arranged. The width regulation guides located on the left side and the width regulation guides located on the right side are each integrally formed via an arm. When the left and right width regulation guides in the winding portion are positioned, the other left and right width regulation guides are also automatically positioned.

JP 2002-128331 A

  In Patent Document 1, a side guide that regulates the paper width position of the continuous paper after being pulled out from the roll paper is interlocked with a movable width regulation guide disposed in the roll paper storage unit. There is an advantage that it is not necessary to individually adjust the position of the side guide. However, it is assumed that a movable width regulation guide is provided on the roll paper storage unit side. In addition, it is desirable that the position restriction by the side guide is restricted at the most downstream side of the sheet conveyance path. For example, it is desirable to perform at a position as close as possible to the printing position of the printer. However, when the side guide is formed integrally with the width regulation guide on the roll paper storage side, the side guide cannot be placed at a desired position due to the layout of peripheral parts, etc. Is low.

  An object of the present invention is to provide a roll that can easily and accurately adjust the position of a side guide that regulates the width of a continuous sheet of paper drawn from roll paper in conjunction with a member on the side of the roll paper storage unit. It is to propose a paper supply device and a printer provided with the roll paper supply device.

  The roll paper supply device of the present invention includes a roll paper storage unit that stores roll paper on which a continuous paper for printing is wound, and the continuous paper drawn from the roll paper stored in the roll paper storage unit. A side guide that defines an end position in the paper width direction, and the side guide is slidable in the paper width direction, and is stored in the roll paper storage unit when slid in the paper width direction. It is possible to contact the end surface of the roll paper.

  Set the roll paper in the roll paper storage unit and pull out the continuous paper from the roll paper. Thereafter, the side guide is slid in the paper width direction and brought into contact with the end face of the roll paper. Thereby, the position of the side guide in the paper width direction is set. The position of the side guide can be accurately adjusted without damaging the end of the drawn continuous paper by a simple operation of applying the side guide to the end surface of the roll paper.

  Here, when viewed along the paper width direction, the side guide has a side shape as long as the side guide has a portion that overlaps a part of an end surface of the roll paper stored in the roll paper storage unit. When the guide is slid in the paper width direction, it can be brought into contact with the end face of the roll paper.

  Further, one end of the continuous sheet in the width direction can be defined by a fixed side guide disposed at a fixed position, and the other end can be defined by the sliding side guide of the present invention as described above. Instead of this, a pair of side guides for regulating the end positions of both sides of the continuous paper in the paper width direction may be arranged.

  Next, in addition to the above configuration, the roll paper supply device of the present invention includes a roll paper support shaft extending in the paper width direction that defines a rotation center line of the roll paper stored in the roll paper storage unit. The side guides are supported so as to be slidable in the direction of the axis extending in the paper width direction, and rotated in a direction approaching and separating from the roll paper support shaft about the axis. And a side guide support shaft that is supported in a possible state.

  When a pair of side guides that regulate the end positions of both sides of the continuous paper in the paper width direction are disposed as the side guides, the side guides abut against the outer peripheral surface of the roll paper stored in the roll paper storage unit. A roll paper pressing shaft that is stretched between the pair of side guides in a state extending in the paper width direction so as to be in contact with the roll paper pressing shaft is disposed in each of the pair of side guides. It is supported at a part different from the side guide spindle.

  The roll paper pressing shaft is spanned between a pair of side guides that can rotate about the side guide support shaft. If the position of the roll paper pressing shaft spanning the pair of side guides, that is, the distance from the side guide support shaft to the roll paper pressing shaft is set appropriately, the roll paper pressing shaft is stored in the roll paper storage section. It can be in a state of being in contact with the outer peripheral surface of the roll paper. To maintain the contact state, set the posture of the side guides so that the weight of the side guides, etc., causes the rotational moment to rotate the side guides toward the roll paper support shaft around the side guide support shaft. Good. Or what is necessary is just to maintain a contact state using a spring member and an elastic member.

  If the roll paper pressing shaft is in contact with the outer peripheral surface of the roll paper, the pair of side guides also rotate about the side guide support shaft as the outer diameter of the roll paper changes. Therefore, even when the outer diameter of the roll paper is reduced, the state where the side guide is always in contact with the end face of the roll paper can be maintained. Regardless of the diameter of the roll paper set in the roll paper storage unit, the side guide can be reliably brought into contact with the end face of the roll paper, and the position of the side guide can be accurately set. Even when a narrow member is used as the side guide, the side guide is always kept in contact with the end face of the outer side of the roll paper regardless of the outer diameter of the roll paper. it can. Therefore, it is not necessary to use a wide side guide having a large size.

  Next, in the case of having a paper guide shaft on which the continuous paper drawn from the roll paper is bridged, the paper guide shaft can be used as the side guide support shaft. The portion of the continuous paper that is stretched around the paper guide shaft is bent, and the bent portion of the continuous paper is in a strong state (high out-of-plane rigidity). If the bent portion of the continuous paper is regulated by the side guide, the position in the width direction of the conveyed continuous paper can be accurately regulated without causing the end of the continuous paper to be bent.

  Further, the paper guide shaft can be a paper guide shaft having a function of applying tension to the continuous paper being conveyed. In this case, the paper guide shaft is slidable in a direction perpendicular to the axis of the paper guide shaft. Further, the paper guide shaft 17 is urged by an elastic member in a slidable direction toward one direction in which tension is applied to the continuous paper.

  The roll paper storage unit may be equipped with a detection mechanism for detecting that the remaining amount of roll paper has become a predetermined amount or less. As a detection mechanism, there is known a detection mechanism that performs a detection operation based on the rotation position of a detection member for near-end detection that rotates in accordance with a decrease in the outer diameter of the roll paper. In this case, a side guide that rotates as the outer diameter of the roll paper changes can be used as a detection member for near-end detection. Alternatively, the near-end detection member can be rotated in conjunction with the side guide.

  A slidable paper guide shaft having a function of applying tension to continuous paper is used as the paper guide shaft, and the roll paper support shaft is centered on an axis extending in the paper width direction different from the paper guide shaft. In the case of using a detection member for detecting near-end that can rotate in the approaching and separating directions, the roll paper pressing shaft is connected to a portion of the detection member that is away from the axis. The roll paper pressing shaft is bridged between the pair of side guides so as to be slidable in a direction approaching and separating from the paper guide shaft. Accordingly, the side guide can be rotated about the paper guide shaft by using the roll paper pressing shaft that revolves around the axis that defines the rotation center of the detection member.

  Next, a printer according to the present invention includes a roll paper supply device configured as described above, a print head that performs printing on continuous paper supplied from the roll paper supply device, and a conveyance path that passes through the print position of the print head. And a transport mechanism for transporting the continuous paper. The continuous paper is conveyed to the printing position in a state where the position in the width direction is accurately defined by the side guide of the roll paper supply device. Printing can be performed without causing printing misalignment in the paper width direction.

1 is a perspective view showing an embodiment of a printer to which the present invention is applied. It is a schematic longitudinal cross-sectional view of the printer of FIG. It is a schematic longitudinal cross-sectional view of the printer of FIG.

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

  FIG. 1A is an external perspective view of the printer according to the present embodiment, and FIG. 1B is a perspective view of the printer with the printer cover removed.

  The printer 1 includes a printer body unit 2 having a rectangular parallelepiped shape, and a roll paper unit 3 (roll paper supply device) attached to the rear end of the printer body unit 2. The printer body unit 2 includes a printer housing 4 and a printer mechanism unit 5 disposed inside the printer housing 4. The upper surface portion of the printer housing 4 is an opening 6 that opens upward, and a printer cover 7 is attached in a detachable state.

  The roll paper unit 3 includes a unit casing 8, and the unit casing 8 includes side plates 9 and 10 disposed on both sides in the printer width direction X. A portion between the side plates 9 and 10 of the unit housing 8 is a roll paper storage unit 12 that stores the roll paper 11 indicated by an imaginary line in FIG. A portion of the roll paper storage unit 12 on the front side of the printer is sealed by a flat unit cover 13. The roll paper storage unit 12 opens to the upper side of the printer and the rear side of the printer.

  The unit cover 13 can be opened upward with the rear end edge portion 13a on the rear side in the printer longitudinal direction Y as a center. A front end edge 13 b of the unit cover 13 is covered from above by a portion 7 a on the rear end side of the printer cover 7. When the printer cover 7 is removed, the unit cover 13 can be opened as shown in FIG.

  FIG. 2A is a schematic longitudinal sectional view showing the internal structure of the printer, and FIG. 2B is a partial explanatory view thereof. These drawings show a state in which a new roll paper 11 is loaded in the roll paper storage unit 12. FIG. 3A is a schematic longitudinal sectional view showing the internal structure of the printer, and FIG. 3B is a partial explanatory view thereof. These drawings show a state in which the roll paper 11 of the roll paper storage unit 12 is in a near-end state.

  Referring to these figures as well, a roll paper spindle 14 extending in the printer width direction X is disposed in the roll paper storage unit 12 of the roll paper unit 3. The roll paper spindle 14 is bridged between the side plates 9 and 10. The side plates 9 and 10 are formed with bearing grooves 15 and 16 for supporting shaft end portions 14a and 14b on both sides of the roll paper support shaft 14 in a rotatable state (see FIG. 1). The bearing grooves 15 and 16 are opened obliquely upward toward the rear of the printer, and the roll paper support shaft 14 can be attached to and detached from the bearing grooves 15 and 16.

  A paper guide shaft 17 is disposed on the front side of the printer with respect to the roll paper support shaft 14. The continuous paper 11 a drawn from the roll paper 11 mounted on the roll paper support shaft 14 is bridged on the paper guide shaft 17. The continuous paper 11a is drawn obliquely upward from the roll paper 11 toward the front of the printer, is laid around the paper guide shaft 17, and is conveyed obliquely below the front of the printer from here and sent into the printer main unit 2.

  The paper guide shaft 17 is bridged between the side plates 9 and 10 (support members). Since the roll paper 11 is arranged such that the central axis thereof extends in the printer width direction X, the paper width direction of the continuous paper 11 a drawn from the roll paper 11 matches the printer width direction X.

  The paper guide shaft 17 includes a tension adjustment mechanism that maintains the transported continuous paper 11a in a predetermined tension state. As can be seen from FIG. 2B, an oval shaft hole 18a (only the shaft hole on the side of the side plate 10 is shown in the drawing) is formed on the inner side of the side plates 9 and 10 in a substantially vertical direction Z of the printer. Has been. Shaft end portions 17a on both sides of the paper guide shaft 17 (only the shaft end portions on the side plate 10 side are shown in the drawing) are along the shaft hole 18a in a direction perpendicular to the central axis of the paper guide shaft 17. It is supported in a slidable state.

  Between the shaft end portions 17a on both sides of the paper guide shaft 17 and the side plates 9, 10, a tension coil spring 19 (only the tension coil spring on the side plate 10 side is shown in the figure) is spanned. Each shaft end portion 17a is always pulled by each tension coil spring 19 in one direction in the sliding direction of the shaft end portion 17a along each shaft hole 17a, in this example, upward. Therefore, the paper guide shaft 17 can move in the vertical direction along the shaft hole 18a in accordance with the fluctuation of the tension acting on the continuous paper 11a.

  Here, side guides 20 and 21 for defining end positions in the sheet width direction of the continuous sheet 11 a drawn from the roll sheet 11 are attached to the shaft end portions 17 a on both sides of the sheet guide shaft 17. The side guides 20 and 21 have the same shape and size, and are arranged in a bilaterally symmetrical state (see FIG. 1). Therefore, the description will be made centering on one side guide 21. The side guides 20 and 21 may have different shapes. The shape of the side guides 20 and 21 is a shape including a portion that overlaps a part of the end surface 11b of the roll paper 11 stored in the roll paper storage portion 12 when viewed from the paper width direction. Thus, when the side guides 20 and 21 are slid in the paper width direction, they can be brought into contact with the end surface 11 b of the roll paper 11.

  The side guide 21 is a flat plate-like member that is elongated in one direction as a whole and is disposed inside the side plate 10. One end portion 21 a in the long side direction of the side guide 21 is supported by the shaft end portion 17 a of the paper guide shaft 17 so as to be slidable in the axial direction (paper width direction of the continuous paper 11 a). Further, the end portion 21 a is supported by the shaft end portion 17 a of the paper guide shaft 17 so as to be rotatable about the paper guide shaft 17.

  The side guide 21 can be attached to a general paper guide shaft having no tension adjusting function instead of being attached to the paper guide shaft 17 having the tension adjusting function. Further, depending on the case, it is also possible to arrange them so as to be rotatable around a side guide support shaft provided on the paper transport path. Furthermore, it is also possible to arrange in a non-rotatable state at a fixed position.

  In this example, the paper guide shaft 17 is positioned on the most downstream side of the paper transport path in the roll paper unit 3. In other words, in the paper transport path of the roll paper unit 3, the paper guide shaft 17 is a component that is closest to a print position (described later) in the printer body unit 2. It is preferable to dispose the side guide 21 on the paper guide shaft 17 because the paper width direction can be regulated at a position as close as possible to the printing position, and the position in the paper width direction at the printing position can be accurately defined.

  In the side guide 21, the length L1 from the rotation center 21b supported by the shaft end portion 17a of the paper guide shaft 17 to the other end in the length direction of the side guide 21 is from the rotation center 21b to the roll paper support. It is longer than the distance L2 to the outer peripheral surface of the shaft 14. Therefore, when the side guide 21 is slid along the paper guide shaft 17 in the paper width direction regardless of the outer diameter of the roll paper 11 mounted on the roll paper spindle 14, the side guide 21 is moved to the side of the roll paper 11. It can come into contact with the end face 11b.

  In this example, both side guides 20 and 21 on both sides in the paper width direction are slidable. Instead of this, only one side guide 21 can be slidable, and the other side guide 20 can be supported at a fixed position at the shaft end of the paper guide shaft 17 in a state where only rotation is possible.

  As can be seen from FIG. 1B, a roll paper pressing shaft 23 is bridged between the end portions 20c, 21c of the side guides 20, 21 on both sides opposite to the rotation center 21b. The end portions 20c and 21c of the side guides 20 and 21 are formed with oval guide holes 24a and 24b extending in the length direction. The shaft end portions 23a and 23b on both sides of the roll paper pressing shaft 23 are passed through the guide holes 24a and 24b in a slidable manner along the guide holes 24a and 24b. The shaft end portions 23 a and 23 b are passed through the guide holes 24 a and 24 b in a state where the shaft end portions 23 a and 23 b can rotate around the center axis of the roll paper pressing shaft 23. Further, the shaft end portions 23a and 23b are passed through the guide holes 24a and 24b so as to be slidable in the paper width direction.

  As shown in FIG. 2, the side guides 20 and 21 are leaned against the outer peripheral surface 11 c of the roll paper 11 via the roll paper holding shaft 23. Due to the weight of the side guides 20, 21, the roll paper pressing shaft 23, etc., the roll paper pressing shaft 23 is always maintained in a state of being engaged (contacted) with the outer peripheral surface 11 c of the roll paper 11.

  That is, as shown in the figure, when the printer 1 is placed on a horizontal installation surface, the center of gravity of the side guides 20 and 21 and the members that rotate together with the side guides 20 and 21 are more rolled than the paper guide shaft 17. Located on the paper spindle 14 side. As a result, a rotational moment in a direction approaching the roll paper support shaft 14 is always applied to the side guides 20 and 21 around the paper guide shaft 17. Instead of using the rotational moment due to gravity, it is also possible to arrange a spring member, an elastic member or the like so that the side guides 20 and 21 are always urged in the direction approaching the roll paper support shaft 14.

  When the outer diameter of the roll paper 11 is reduced, the side guides 20 and 21 are gradually tilted toward the roll paper support shaft 14 around their rotation centers. Therefore, the side guides 20 and 21 are maintained in contact with the outer peripheral portion of the end surface 11 b of the roll paper 11 regardless of the outer diameter of the roll paper 11.

  Instead of the roll paper pressing shaft 23, each side guide 20 and 21 can be formed with a portion that engages with the outer peripheral surface 11c of the roll paper 11. Even in this case, the side guides 20 and 21 can rotate while abutting (engaging) with the outer peripheral surface 11 c of the roll paper 11.

  Here, the roll paper storage unit 12 incorporates a near-end detection mechanism 30 that detects that the remaining amount of the roll paper 11 has become a predetermined amount or less. The near-end detection mechanism 30 includes a detection member 31 that rotates in response to a decrease in the outer diameter of the roll paper 11 and a detector 32 that detects that the detection member 31 has rotated to a predetermined rotation position.

  The detection member 31 rotates in conjunction with the rotation of one side guide 21. The detection member 31 is disposed between the side plate 10 and the side guide 21 disposed on the inner side. In FIG. 2B and FIG. 3B, the side guide 21 is indicated by an imaginary line, so that the detection member 31 is displayed in an easily understandable manner. One end 31 a of the detection member 31 is connected to the shaft end 23 b of the roll paper pressing shaft 23 in a rotatable state. The other end 31 b of the detection member 31 is attached to the side plate 10 so as to be rotatable in a direction approaching and separating from the roll paper support shaft 14 around a fixed rotation center line 33. The rotation center 33 is located on the side closer to the roll paper support shaft 14 with respect to the paper guide shaft 17.

  A projecting portion 31 c projecting toward the roll paper spindle 14 is formed at a portion between the end portions 31 a and 31 b of the detection member 31. A detector 32 is disposed at a lower portion of the roll paper support shaft 14. In the detector 32, a detection piece 32 a such as a limit switch is disposed at a position on the rotation locus of the protrusion 31 c of the detection member 31. When the detection piece 32a is pushed by the protruding portion 31c, the detector 32 generates a near-end detection signal indicating that the remaining amount of the roll paper 11 has become a predetermined amount or less.

  In this example, the paper guide shaft 17 to which the side guides 20 and 21 are attached has a tension adjustment function. As the paper guide shaft 17 moves in the vertical direction, the side guides 20 and 21 also move. On the other hand, when the side guides 20 and 21 are attached so as to be rotatable around a paper guide shaft fixedly arranged at a fixed position, the rotational positions of the side guides 20 and 21 are as follows. This corresponds to the remaining amount of roll paper 11. In this case, the side guides 20 and 21 can be used as the detection member 31 as they are.

  Next, the internal structure of the printer main unit 2 on which the roll paper unit 3 having the above-described configuration is mounted will be briefly described.

  A platen roller 41 extending in the printer width direction X is disposed inside the printer body unit 2. An impact dot type print head 42 is opposed to the platen roller 41 from the front side of the printer. The print head 42 is mounted on a head carriage (not shown), and can be moved along a carriage guide shaft 44 spanned in the printer width direction by a carriage drive mechanism (not shown).

  The continuous paper 11 a supplied from the roll paper unit 3 via the side guides 20 and 21 is guided to the platen roller 41 by the paper guide plate 45. A pair of transport rollers 46 a and 46 b are disposed below the platen roller 41. On the upper side of the platen roller 41, a paper discharge roller 46c is disposed. The continuous paper 11a sandwiched between the transport rollers 46a and 46b and the platen roller 41 is transported along a transport path passing through the print position of the print head 42 by a transport mechanism including these rollers 41, 46a and 46b. Is done. The continuous paper 11a after passing through the printing position passes through the paper discharge roller 46c, passes through the paper discharge port 47 formed between the printer cover 7 and the unit cover 13, and is placed on the upper surface of the unit cover 13. Will be discharged along.

  The upper surface of the unit cover 13 functions as a paper discharge guide surface. A discharge guide frame 48 is attached to the end of the unit cover 13 in a rotatable state. The discharged continuous paper 11 a is guided from the upper surface of the unit cover 13 by the paper discharge guide frame 48 and is discharged above the roll paper 11.

  The operation when the roll paper is set in the roll paper unit 3 in the printer 1 having the above configuration will be described. Open the printer cover 7 and the unit cover 13. Further, the roll paper spindle 14 is removed from the unit housing 8 of the roll paper unit 3. The roll paper 11 is attached to the roll paper spindle 14, and the roll paper spindle 14 is attached to the unit housing 8 in this state. As a result, the roll paper 11 is attached to the roll paper storage unit 12 of the unit housing 8.

  After the continuous paper 11a is pulled out from the roll paper 11 and laid over the paper guide shaft 17, it is arranged along the paper guide plate 45 and drawn out to the discharge side through between the platen roller 41 and the transport rollers 46a and 46b.

  The side guides 20 and 21 attached to both sides of the paper guide shaft 17 are slid in the paper width direction (printer width direction X). The slide positions of the side guides 20 and 21 are adjusted so that they are just in contact with the paper edges on both sides of the continuous paper 11a spanning the paper guide shaft 17. In this position adjustment, the side guides 20 and 21 can be positioned by bringing the side guides 20 and 21 into contact with the end surfaces 11b on both sides of the roll paper 11, which is very simple.

  For example, the side guides 20 and 21 are attached to the paper guide shaft 17 so as to be slidable with a predetermined sliding resistance, and are not moved from the slid position. Therefore, when the side guides 20 and 21 are slid and positioned in the width direction, it is necessary to slide the side guides 20 and 21 with a certain amount of force. For this reason, conventionally, it is difficult to position the side guides 20 and 21 with high accuracy. Further, if the side guides 20 and 21 are pushed too far inward, the end of the continuous paper 11a may be damaged. However, in this example, since the side guides 20 and 21 are brought into contact with the end face of the roll paper 11, the side guides 20 and 21 are not excessively pushed inward. On the contrary, the side guides 20 and 21 are not too wide to prevent the continuous paper 11a from being conveyed straight.

  After the side guides 20 and 21 are set in this way, the continuous paper 11a is pressed against the platen roller 41 by the transport rollers 46a and 46b. Next, the unit cover 13 is closed and the printer cover 7 is closed.

  In the printing operation, the width of the continuous paper 11a conveyed from the roll paper unit 3 to the printer main unit 2 is accurately defined by the side guides 20 and 21. Therefore, printing is performed by the print head 42 without being displaced in the width direction.

  When the remaining amount of the roll paper 11 is equal to or less than the predetermined remaining amount, the protrusion 31c of the detection member 31 that rotates in conjunction with the side guides 20 and 21 hits the detection piece 32a of the detector 32 as shown in FIG. A near-end detection signal is generated. Thereby, it is possible to notify the operator that the roll paper 11 needs to be replaced.

  In addition, when exchanging the roll paper 11, if the side guides 20 and 21 are not spread, the roll paper 11 newly set on the side guides 20 and 21 may hit. If tapered portions are provided at the edge portions of the side guides 20 and 21, the work of attaching the roll paper support shaft 17 loaded with the roll paper 11 to the roll paper storage unit 12 can be performed smoothly.

  When the roll paper 11 is set without spreading the side guides 20 and 21, the side guides 20 and 21 define the position in the paper width direction of the continuous paper 11a drawn from the roll paper 11 at the same position as before the roll paper replacement. Is done. Therefore, an effect that printing can be performed accurately at the same position as before the roll paper replacement is obtained.

DESCRIPTION OF SYMBOLS 1 Printer, 2 Printer main body unit, 3 Roll paper unit (roll paper supply apparatus), 4 Printer housing, 5 Printer mechanism part, 6 Opening part, 7 Printer cover, 7a site | part, 8 Unit housing, 9, 10 Side plate, 11 roll paper, 11a continuous paper, 11b end face, 11c outer peripheral face, 12 roll paper storage part, 13 unit cover, 13a front edge part, 13b rear edge part, 14 roll paper spindle, 15, 16 bearing groove, 17 paper Guide shaft, 17a shaft end, 18a shaft hole, 19 tension coil spring, 20, 21 side guide, 21a end, 21b rotation center, 20c, 21c end, 23 roll paper pressing shaft, 23a, 23b shaft end, 24a , 24b Guide hole, 30 Near-end detection mechanism, 31 Detection member, 31a, 31b End, 31c Projection, 32 detector, 32a detection piece, 33 center of rotation, 41 platen roller, 42 print head, 44 carriage guide shaft, 45 paper guide plate, 46a, 46b transport roller, 46c paper discharge roller, 47 paper discharge port, 48 Output guide frame

Claims (10)

A roll paper storage unit for storing the roll paper on which the continuous paper for printing is wound;
A side guide for defining an end position in the paper width direction of the continuous paper drawn from the roll paper stored in the roll paper storage unit;
Have
The roll paper is slidable in the paper width direction, and can be brought into contact with an end surface of the roll paper stored in the roll paper storage section when slid in the paper width direction. Feeding device.   The side guide has a contour shape including a portion that overlaps at least a part of an end surface of the roll paper stored in the roll paper storage unit when viewed along the paper width direction. The roll paper supply apparatus according to 1.   The roll paper supply device according to claim 1, wherein a pair of side guides that regulate end positions on both sides of the continuous paper in the paper width direction are arranged as the side guides. A roll paper support shaft extending in the paper width direction defining a rotation center of the roll paper stored in the roll paper storage unit;
The side guide is supported so as to be slidable in the direction of an axis extending in the paper width direction, and is rotatable in a direction approaching and separating from the roll paper support shaft with the axis as a center. A side guide support shaft supported by
The roll paper supply device according to any one of claims 1 to 3, wherein the roll paper supply device is provided. As the side guides, a pair of side guides for restricting end positions on both sides of the continuous paper in the paper width direction are disposed,
A roll paper pressing shaft spanned between the pair of side guides in a state extending in the paper width direction so as to contact the outer peripheral surface of the roll paper stored in the roll paper storage unit;
5. The roll paper supply device according to claim 4, wherein the roll paper pressing shaft is supported at a portion different from the side guide support shaft in each of the pair of side guides. A paper guide shaft on which the continuous paper drawn from the roll paper is bridged;
The roll paper supply device according to claim 4, wherein the side guide support shaft is the paper guide shaft. A support member that supports the paper guide shaft in a slidable state in a direction perpendicular to the axis of the paper guide shaft;
An elastic member that urges the paper guide shaft toward one direction in which tension is applied to the continuous paper in a slidable direction of the paper guide shaft;
The roll paper supply apparatus according to claim 6 having   The remaining amount of the roll paper is detected based on a rotation position of the side guide or a rotation position of a detection member that rotates in conjunction with the rotation of the side guide. The roll paper supply apparatus described in 1. A detection member used for detecting the remaining amount of the roll paper;
The detection member is rotatable in a direction approaching and separating from the roll paper support shaft, with a rotation center at a position different from the paper guide shaft as a center.
The roll paper pressing shaft is connected to a portion of the detection member away from the rotation center,
The roll paper supply device according to claim 7, wherein the roll paper pressing shaft is slid between the pair of side guides so as to be slidable in a direction approaching and separating from the paper guide shaft. A roll paper supply device according to any one of claims 1 to 9,
A print head for printing on continuous paper supplied from the roll paper supply device;
A transport mechanism for transporting the continuous paper via a print position of the print head;
A printer characterized by comprising:

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