JP2013230933A - Rolled paper supporting mechanism and printer - Google Patents

Abstract

To provide a printer equipped with a roll paper support mechanism that facilitates the work of setting and fixing roll paper on a support shaft.
A roll paper holder 7 of a printer 1 has a support shaft 20 having a cylindrical portion 71 fitted into a core 4 of the roll paper 2 and a support portion 23 that supports the support shaft 20. The support shaft 20 includes a lock member 40 that can move between a protruding position 40A protruding from the opening 44 of the outer peripheral surface 30a of the cylindrical portion 71 and a retracted position 40B inside the outer peripheral surface 30a, and a lock position 41A and an open position 41B. The operating member 41 movable between the locking position 41A and the opening position 41B, the locking member 40 is moved from the protruding position 40A to the retracted position 40B, and the operating member 41 is moved to the opening position 41B. A link mechanism 78 is provided for moving the lock member 40 from the retracted position 40B to the lock position 41A when being moved from the retracted position 40B to the lock position 41A.
[Selection] Figure 3

Description

  The present invention relates to a roll paper support mechanism that supports roll paper in a rollable manner, and a printer that performs printing on a recording paper drawn from the roll paper supported by the roll paper support mechanism.

  A printer that prints on a long recording paper drawn out from a roll paper includes a roll paper support mechanism that supports the roll paper in a rollable manner. Patent Document 1 describes a roll paper support mechanism that includes a paper holder that fits into a cylindrical core of roll paper and a support plate that rotatably supports both ends of the paper holder.

  The paper holder of Patent Document 1 is composed of a male holder and a female holder. When the roll paper is supported by the paper holder, the male holder and the female holder are inserted into the core from both sides in the width direction of the roll paper. The engagement shaft of the male holder is engaged with the engagement hole of the female holder. The female holder exhibits a retaining member that protrudes the pressing portion from the opening formed on the outer peripheral surface, and a biasing force that biases the pressing portion outward when the pressing portion is pressed inward. When the female holder is fitted into the roll paper core, the pressing portion is fitted in a state where the inner peripheral surface of the core is pressed. The retaining member includes a pressed portion that is pressed by the engaging shaft when the engaging shaft of the male holder and the engaging shaft of the female holder are engaged, and the pressing portion is pressed when the pressed portion is pressed. Is supported so as to swing in the direction of increasing the amount of protrusion from the opening. As a result, when the male holder and the female holder are engaged, the pressing portion is in a state of being bitten into the inner peripheral surface of the winding core, and the fixing between the roll paper and the paper holder is ensured.

Japanese Patent Laid-Open No. 2007-51012

  In a printer that prints on a recording paper drawn from roll paper, it may be necessary to rewind the drawn recording paper onto the roll paper. For example, when the recording paper is conveyed in the reverse direction, the recording paper is bent in the middle of the paper conveyance path, and thus it is necessary to wind the bent portion of the recording paper on the roll paper. In such a case, if the roll paper is fixed to a support shaft (paper holder) that is inserted into the core, the roll paper can be forcibly rotated via the support shaft. It can be wound on paper.

  Here, in the technique of Patent Document 1, it is possible to fix the roll paper to the support shaft. However, since the support shaft is composed of two members, the work of setting the roll paper to the support shaft is performed. It is complicated. Further, when one member (female holder) constituting the support shaft is inserted into the roll paper core, the pressing portion of the retaining member protruding from the outer peripheral surface of the member is the inner peripheral surface of the core. Therefore, a force is required for the operation of fitting the member into the roll paper core.

  In view of these points, an object of the present invention is to provide a roll paper support mechanism that is easy to set and fix roll paper on a support shaft, and a printer equipped with such a roll paper support mechanism. There is.

  In order to solve the above-described problems, the present invention provides a roll paper support mechanism having a support shaft including a cylindrical portion that is fitted into a cylindrical winding core of roll paper, and a support portion that rotatably supports the support shaft. The support shaft is a lock member that is movable between a projecting position where at least a part projects outward from an opening formed on the outer peripheral surface of the cylindrical portion and a retracted position inside the outer peripheral surface of the cylindrical portion, An operation member that can be displaced between a lock position and an open position different from the lock position, and the lock member is retracted from the protruding position when the operation member is displaced from the lock position to the open position. And a link mechanism that moves the lock member from the retracted position to the lock position when the operation member is displaced from the open position to the lock position. And wherein the are.

  According to the present invention, since the operating member provided on the support shaft is displaced from the lock position to the open position, the lock member can be retracted inside the tube portion of the support shaft. It is possible to avoid interference between the winding core and the lock member when the is inserted into the winding core of the roll paper. Further, the operating member provided on the support shaft is displaced from the open position to the lock position, thereby allowing the lock member to protrude outward from the outer peripheral surface of the cylindrical portion of the support shaft inserted into the roll paper core. it can. Therefore, after the roll paper is fitted into the support shaft, the lock member is brought into contact with the inner peripheral surface of the roll paper core only by operating the operation member provided on the support shaft, and the roll paper is supported on the support shaft. Can be fixed to. Therefore, the operation of setting the roll paper on the support shaft and the operation of fixing the roll paper set on the support shaft to the support shaft are facilitated.

  In the present invention, the link mechanism exerts a biasing force that biases the lock member toward the protruding position when the lock member at the protruding position is pushed toward the retracted position. It is desirable that a spring member is provided. In this way, the roll paper can be fixed to the support shaft using the urging force of the spring member, so even if the roll core diameter varies for each roll paper used, the roll paper can be attached to the support shaft. Can be fixed.

  In the present invention, the length dimension in the axial direction of the cylindrical portion, and the length dimension in the axial direction of the protruding portion of the lock member protruding from the opening at the protruding position are based on the width dimension of the roll paper. It is desirable that the length be too long. In this way, since the lock member can be brought into contact with the winding core over the entire range in the width direction of the roll paper, the fixing of the roll paper to the support shaft can be ensured.

  In the present invention, the roll paper is provided with a pair of flanges that are attached to the cylindrical portion in a state where the roll paper is sandwiched from both sides in the width direction, each flange including a center hole into which the cylindrical portion is inserted, and the center of each flange When the locking member moves to the protruding position with the cylindrical portion inserted into the hole, the locking member and the inner peripheral surface portion of the central hole of each flange come into contact, and the pair of flanges are in contact with the cylindrical portion It is desirable to be fixed to. By providing such a pair of flanges, it is possible to prevent the recording paper from being pulled out obliquely when the recording paper is pulled out from the roll paper. In addition, when the recording paper is wound on the roll paper, the recording paper can be prevented from being wound obliquely. Further, since the pair of flanges are fixed to the support shaft by the lock member moved to the protruding position, it is not necessary to provide a mechanism for preventing the pair of flanges from moving in the axial direction, and the manufacturing cost of the apparatus is reduced. Can be suppressed.

  In the present invention, when one of the pair of flanges is moved along the axis in a state where the cylindrical portion is inserted into the center hole of each flange, the other flange is replaced with the one flange. It is desirable to provide a flange moving mechanism that moves in the reverse direction. In this way, since the roll paper can be guided from both sides by the pair of flanges moving in the opposite directions, the roll paper can be positioned with reference to the center of the tube portion. As a result, the recording paper can be fed out from the center of the tube portion, and the recording paper can be taken up at the center of the tube portion.

  In the present invention, the operation member moves between the open position and the lock position that are separated on the axis, and the lock member is movable in a radial direction perpendicular to the axis. The link mechanism includes a frame movable in the axial direction, and an arm having one end rotatably attached to the frame and the other end rotatably attached to the lock member, A configuration in which the frame is connected to the operation member and moves integrally with the operation member can be employed. If it does in this way, by moving an operation member to one side of an axial direction, a lock member can be moved to a projection position, and roll paper can be fixed to a support axis. Further, by moving the operation member to the other in the axial direction, the lock member can be moved to the retracted position, and the roll paper and the support shaft can be released from being fixed.

  In this case, it is preferable that the link mechanism includes two arms arranged at positions separated in the axial direction as the arms. In this way, since the parallel link mechanism can be configured by the frame, the two arms, and the lock member, the protrusion amount in the axial direction is made uniform when the lock member protrudes from the opening. It becomes easy.

  In the present invention, the operation member rotates between the open position and the lock position that are separated from each other about the axis, and the link mechanism transmits the rotation of the cam and the operation member to the cam. A transmission mechanism that rotates the cam; and a cam follower that is in sliding contact with the cam surface of the cam; a link member that is displaced as the cam rotates; and the lock member is attached to the link member. A configuration can also be adopted. If it does in this way, by rotating an operation member to one side, a lock member can be moved to a protrusion position, and roll paper can be fixed to a support axis. Further, by rotating the operation member in the other direction, the lock member can be moved to the retracted position, and the roll paper and the support shaft can be unlocked.

  In the present invention, a plurality of openings as the openings are provided at equal angular intervals in the circumferential direction on the outer peripheral surface of the cylindrical portion, and a plurality of lock members corresponding to the plurality of openings are used as the lock members. It is desirable to have. In this way, the roll paper can be reliably fixed to the support shaft. In addition, it becomes easy to make the rolling center of the roll paper coincide with the center axis of the support shaft.

  In the present invention, it is preferable that the support shaft is supported by the support portion in a detachable state. With this configuration, the roll paper can be set on the support shaft in a state where the support shaft is removed from the support portion, and therefore, the work of setting the roll paper on the support shaft is facilitated.

  Next, the printer of the present invention conveys the roll paper support mechanism and the long recording paper drawn from the roll paper supported by the roll paper support mechanism along a conveyance path that passes through the printing position. And a print head that performs printing on the recording paper that is conveyed at the printing position.

  According to the printer of the present invention, the operation of setting the roll paper on the support shaft of the roll paper support mechanism and the operation of fixing the roll paper to the support shaft are easy.

  In the present invention, it is desirable to have a support shaft drive mechanism that rotationally drives the support shaft of the roll paper support mechanism. In the printer of the present invention, since the roll paper is fixed to the support shaft in the roll paper support mechanism, if the support shaft is rotationally driven by the support shaft drive mechanism, the roll paper is forcibly rotated to roll the recording paper. Can be wound on paper.

  According to the present invention, since the operating member provided on the support shaft is displaced from the lock position to the open position, the lock member can be retracted inside the tube portion of the support shaft. It is possible to avoid interference between the winding core and the lock member when the is inserted into the winding core of the roll paper. Further, after the roll paper is fitted on the support shaft, the lock member is brought into contact with the inner peripheral surface of the roll paper core only by operating the operation member provided on the support shaft, and the roll paper is supported on the support shaft. Can be fixed to. Therefore, the operation of setting the roll paper on the support shaft and the operation of fixing the roll paper set on the support shaft to the support shaft are facilitated.

1 is a schematic longitudinal sectional view showing a main part of a printer to which the present invention is applied. It is a perspective view of the principal part of a roll paper holder. It is explanatory drawing of a structure of a support shaft. It is sectional drawing of the arm which comprises the link mechanism. It is explanatory drawing of a pair of flange and a flange moving mechanism. It is a schematic perspective view of the roll paper holder of a modification. It is explanatory drawing of the support shaft of the roll paper holder of a modification. It is explanatory drawing of the support shaft of the roll paper holder of a modification.

  Hereinafter, an embodiment of a printer to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a schematic longitudinal sectional view showing a main part of a printer to which the present invention is applied. FIG. 2 is a perspective view of the main part of the roll paper holder. The printer 1 of the present invention is a roll paper printer that prints on a long recording paper 3 drawn from the roll paper 2. The roll paper 2 is obtained by winding the recording paper 3 around a cylindrical core 4 with the printing surface facing outward.

  As shown in FIG. 1, the printer 1 includes a main body frame 5. A paper discharge port 6 is formed on the front surface of the main body frame 5. A roll paper holder 7 on which the roll paper 2 is loaded in a rollable state is provided at the rear portion of the main body frame 5. The main body frame 5 is provided with a paper conveyance path 8 extending from the roll paper holder 7 to the paper discharge port 6 via the printing position P. At the printing position P, the platen 9 and the print head 10 are arranged to face each other. Has been. The print head 10 is an inkjet head. In the paper transport path 8, the paper feed roller pair 11 is arranged on the roll paper holder 7 side from the printing position P, and the paper discharge roller pair 12 is arranged on the paper discharge port 6 side from the printing position P. Has been. The paper feed roller pair 11 and the paper discharge roller pair 12 are rotationally driven in the forward and reverse directions by the transport motor 13. The paper feed roller pair 11, the paper discharge roller pair 12, and the transport motor 13 constitute a transport mechanism 14 that transports the recording paper 3.

  As shown in FIG. 2, the roll paper holder 7 includes a support shaft 20 that supports the roll paper 2, a pair of flanges 21 and 22 supported by the support shaft 20, and a support unit that rotatably supports the support shaft 20. And a support shaft drive mechanism 24 that rotationally drives the support shaft 20. As shown in FIG. 1, the support shaft 20 is arranged with its axis L directed in the printer width direction. The roll paper 2 is fixed to the support shaft 20 in a state where the support shaft 20 is fitted into the core 4 and is sandwiched from both sides in the width direction by a pair of flanges 21 and 22.

  The recording paper 3 is pulled out from the roll paper 2 loaded in the roll paper holder 7 along the paper conveyance path 8 and set in a state in which the printing start position set in advance on the recording paper 3 is aligned with the printing position P. Is done. When print data is supplied from an external device to the printer 1 with the recording paper 3 set, the transport motor 13 is driven in the forward direction. As a result, the paper feed roller pair 11 and the paper discharge roller pair 12 are rotationally driven, and the recording paper 3 is conveyed in the forward direction toward the paper discharge port 6. In addition, the print head 10 is driven in parallel with the conveyance of the recording paper 3, and printing is performed on the recording paper 3 that passes the printing position P by the print head 10. When printing of the print data is completed, the recording paper 3 is conveyed until the printed portion on the recording paper 3 is exposed to the outside from the paper discharge port 6, and then the printer 1 stores the next print data. It will be in the standby state waiting for supply.

  When new print data is supplied to the printer 1 in the standby state, the transport motor 13 is driven in the reverse direction. Further, the support shaft drive mechanism 24 is driven. As a result, the paper feed roller pair 11, the paper discharge roller pair 12 and the support shaft 20 are rotationally driven, and the recording paper 3 is conveyed in the reverse direction toward the roll paper holder 7. Thereafter, when the next printing start position on the recording paper 3 reaches the printing position P, the conveyance of the recording paper 3 is stopped, and the next printing start position on the recording paper 3 is positioned at the printing position P.

  When the positioning is completed, the transport motor 13 and the print head 10 are driven, and new print data is printed. That is, the transport motor 13 is driven in the forward direction, whereby the paper feed roller pair 11 and the paper discharge roller pair 12 are rotationally driven, and the recording paper 3 is transported in the positive direction toward the paper discharge port 6. In addition, the print head 10 is driven in parallel with the conveyance of the recording paper 3, and printing is performed on the recording paper 3 that passes the printing position P by the print head 10. When printing of the print data is completed, the recording paper 3 is conveyed until the printed portion on the recording paper 3 is exposed to the outside from the paper discharge port 6, and then the printer 1 stores the next print data. It will be in the standby state waiting for supply.

(Roll paper holder)
Next, the roll paper holder 7 will be described in detail with reference to FIGS. 3 (a) and 3 (b) are schematic cross-sectional views of the support shaft 20, and FIG. 3 (c) is a cross-sectional view of the support shaft 20 along the line AA in FIG. 3 (b). (D) is the side view of the support shaft seen from the operation member side. FIG. 4 is a sectional view of the arm constituting the link mechanism. FIG. 5 is an explanatory diagram of a pair of flanges 21 and 22 and a flange moving mechanism.

  As shown in FIG. 2, the support shaft 20 includes a cylindrical portion 30 that is fitted into the core 4 of the roll paper 2 at the central portion in the axis L direction. Small diameter portions 31 having a diameter smaller than that of the cylindrical portion 30 are provided on both sides of the cylindrical portion 30 in the axis L direction. A large-diameter portion 32 having a larger diameter than the small-diameter portion 31 is provided outside the small-diameter portion 31 in the axis L direction. The cylindrical part 30, the small diameter part 31, and the large diameter part 32 are formed coaxially.

  The support part 23 supports the small diameter part 31 so as to be rotatable from below. The support shaft 20 is attached to the support portion 23 from above the support portion 23, and the support shaft 20 can be detached from the support portion 23 by moving the support shaft 20 upward. That is, the support shaft 20 is supported by the support portion 23 in a detachable state.

  The support shaft drive mechanism 24 includes a support shaft drive motor 33 and a drive force transmission mechanism 34 that transmits the drive force of the support shaft drive motor 33 to the support shaft 20.

  The first flange 21 and the second flange 22 constituting the pair of flanges 21 and 22 each have a center hole 35, and the cylindrical portion 30 of the support shaft 20 is inserted into each center hole 35. The inner diameter of each center hole 35 is the same as the inner diameter dimension of the core 4 of the roll paper 2 loaded in the roll paper holder 7 and is slightly larger than the outer diameter dimension of the cylindrical portion 30.

  As shown in FIGS. 3 and 4, the support shaft 20 includes a lock member 40, an operation member 41, a link mechanism 42 that moves the lock member 40 in conjunction with the operation of the operation member 41, and a pair of flanges 21 and 22. Is mounted with a flange moving mechanism 43.

  The lock member 40 is formed of an elastic body such as resin or rubber, and has a protruding position 40 </ b> A that partially protrudes outward from an opening 44 formed on the outer peripheral surface of the cylindrical portion 30 and an outer peripheral surface 30 a of the cylindrical portion 30. It is possible to move between the inner retreat position 40B. The protruding position 40 </ b> A and the retracted position 40 </ b> B are at positions separated in the radial direction perpendicular to the axis L. Here, as shown in FIG. 3C, openings 44 (1), 44 (2), and 44 (44) are formed on the outer peripheral surface 30 a of the cylinder portion 30 as openings 44 at three equiangular intervals in the circumferential direction. 3) is provided. Each opening 44 (1), 44 (2), 44 (3) is a rectangle that is long in the axis L direction, and the dimension in the axis L direction of each opening 44 (1), 44 (2), 44 (3) is It is longer than the width dimension of the roll paper 2 loaded in the roll paper holder 7. The support shaft 20 has three lock members 40 (1), 40 (2), 40 (3) protruding from the openings 44 (1), 44 (2), 44 (3) as the lock member 40, respectively. ) Is installed. Each lock member 40 (1), 40 (2), 40 (3) has a shape corresponding to each opening 44 (1), 44 (2), 44 (3), and each lock member 40 (1 ), 40 (2), 40 (3) are longer in the direction of the axis L than the width of the roll paper 2 loaded in the roll paper holder 7.

  The operation member 41 constitutes one large-diameter portion 32 of the support shaft 20, and as shown in FIGS. 3A and 3B, the lock position 41 </ b> A and the open position are separated from each other on the axis L. Move between 41B. The lock position 41A is a position where the operating member 41 and the large diameter portion 32 overlap in the axis L direction, and the open position 41B is a position deviated from the large diameter portion 32 to the outside in the axis L direction. As shown in FIG. 3D, the operation member 41 is provided with an engagement hole 46 that can be engaged with an engagement claw 45 protruding from the small diameter portion when the operation member 41 is disposed at the lock position 41A.

  The link mechanism 42 has a rod-shaped frame (frame) 47 that is long in the direction of the axis L, and one end rotatably attached to the rod-shaped frame 47, and the other end is a lock member 40 (1), 40 (2), 40. (3) is provided with a plurality of arms 48 rotatably attached.

  The rod-shaped frame 47 is disposed on the axis L. Further, one end portion of the rod-shaped frame 47 is connected to the operation member 41, and is movable in the direction of the axis L integrally with the operation member 41. Here, the operation member 41 is attached to the end portion of the rod-shaped frame 47 so as to be rotatable around the axis L, and when the operation member 41 is disposed at the lock position 41A as shown in FIG. By rotating the operation member 41 to one side around the axis L, the engagement hole 46 of the operation member 41 and the engagement claw 45 of the large diameter portion 32 can be engaged. Further, by rotating the operation member 41 to the other side around the axis L at the lock position 41 </ b> A, the engagement between the engagement hole 46 of the operation member 41 and the engagement claw 45 of the large diameter portion 32 can be released.

  As shown in FIG. 4, the arm 48 includes a first arm member 49, a second arm member 50, and a coil spring (spring member) 51 disposed between the first arm member 49 and the second arm member 50. I have. The first arm member 49 includes a cylindrical portion 52 and a bottom plate 53 that seals one end of the cylindrical portion 52, and lock members 40 (1) and 40 (2) are provided on the bottom plate 53 side of the cylindrical portion 52. , 40 (3) includes a first fixing portion 54 attached in a rotatable state. The second arm member 50 has a rod shape, one end portion is inserted inside the cylindrical portion 52, and a second fixing portion 55 that is rotatably attached to the rod-shaped frame 47 at the other end portion. . The coil spring 51 is inserted between the bottom plate 53 of the first arm member 49 and the end surface of the second arm member 50 on the bottom plate side. The coil spring 51 has the lock members 40 (1), 40 (2), and 40 (3) in the retracted position 40B in a state where the lock members 40 (1), 40 (2), and 40 (3) are arranged at the protruding position 40A. When pushed toward the side, the urging force that urges the lock members 40 (1), 40 (2), 40 (3) toward the protruding position 40A is exhibited.

  Here, the link mechanism 42 includes two arms 48 as the arms 48 that connect each of the plurality of lock members 40 (1), 40 (2), and 40 (3) and the rod-shaped frame 47. The two arms 48 connected to one lock member 40 (1), 40 (2), 40 (3) are arranged at positions separated in the direction of the axis L, and one lock member 40 (1). , 40 (2), 40 (3), the two arms 48 fixed to the lock members 40 (1), 40 (2), 40 (3) and the rod-shaped frame 47 constitute a parallel link mechanism. doing.

  As shown in FIG. 3A, when the operation member 41 is moved from the lock position 41A to the release position 41B, the link mechanism 42 moves the lock members 40 (1), 40 (2), and 40 (3) to the protruding position 40A. To the retracted position 40B. More specifically, when the operation member 41 is moved from the lock position 41A to the release position 41B, the rod-shaped frame 47 moves integrally with the operation member 41 in the direction of the axis L to the right side in the figure. As a result, the two arms 48 supporting the lock members 40 (1), 40 (2), and 40 (3) are inclined with respect to the axis L, so that the lock members 40 (1), 40 (2) and 40 (3) move to the inside of the cylindrical portion 30 and are disposed at the retracted position 40B. As shown in FIG. 3B, when the operation member 41 is moved from the open position 41B to the lock position 41A, the link mechanism 42 moves the lock members 40 (1), 40 (2), and 40 (3). Move from the retreat position 40B to the lock position 41A. More specifically, when the operation member 41 is moved from the open position 41B to the lock position 41A, the rod-like frame 47 moves integrally with the operation member 41 in the direction of the axis L to the left in the figure, and each lock member 40 (1 ), 40 (2), 40 (3), the two arms 48 are orthogonal to the axis L, so that the lock members 40 (1), 40 (2), 40 (3) Is disposed at the projecting position 40A, and a part of the projecting position is projected outward from the openings 44 (1), 44 (2), 44 (3) of the cylindrical portion 30.

  Next, when one flange of the pair of flanges 21 and 22 is moved along the axis L, the flange moving mechanism 43 moves the other flange in a direction opposite to the one flange. As shown in FIG. 5, the flange moving mechanism 43 is parallel to the pair of guide grooves 60 (see FIG. 2) formed on the outer peripheral surface 30 a of the cylindrical portion 30 with the tooth surfaces facing each other inside the cylindrical portion 30. A pair of rack gears 61 and 62 and a pinion gear 63 disposed between the rack gears 61 and 62 are provided. Each of the pair of guide grooves 60 extends in the direction of the axis L, and is provided at an angular position that is 180 degrees away from each other.

  Here, a pair of guide protrusions 64 projecting inward at angular positions 180 ° apart from each other are provided on the inner peripheral surface of the center hole 35 of each flange 21, 22, and the cylindrical portion 30 of the support shaft 20. Is inserted into the center hole 35 with the guide protrusions 64 of the flanges 21 and 22 inserted into the guide grooves 60 (see FIG. 2). Each of the rack gears 61 and 62 includes an engaging protrusion 65, and each engaging protrusion 65 is inserted into the guide groove 60 and protrudes to the inside of the cylindrical portion 30, and the guide protrusion 64 of each flange 21 and 22. Can be engaged. In this example, the guide protrusion 64 of one of the flanges 21 arranged on the left side in FIG. 5 is fixed with a screw or the like while being engaged with the engagement protrusion 65 of the rack gear 61. Thereby, the flange 21 and the rack gear 61 move integrally. Further, the other flange 22 arranged on the right side in FIG. 5 is detachable in the direction of the axis L with respect to the support shaft 20, and the guide protrusion 64 is inserted into the guide groove 60 to support the flange 22. When mounted on the shaft 20, the guide protrusion 64 and the engagement protrusion 65 of the rack gear 62 are engaged.

  When the flange 21 is moved in the direction of the axis L with the guide protrusion 64 of the flange 22 and the engagement protrusion 65 of the rack gear 62 engaged, the rack gear 61 engaged with the moved flange 21 moves. Thus, the pinion gear 63 rotates. As a result, the other rack gear 62 and the other flange 22 engaged therewith move in the opposite direction by the same distance. When the flange 22 is moved in the direction of the axis L with the guide protrusion 64 of the flange 22 and the engagement protrusion 65 of the rack gear 62 engaged, the rack gear 62 engaged with the moved flange 22 is moved. It moves and the pinion gear 63 rotates. As a result, the other rack gear 61 and the other flange 21 engaged therewith move in the opposite direction by the same distance. Here, in this example, the pinion gear 63 is arranged at the center of the support shaft 20 in the direction of the axis L. Therefore, the roll paper 2 sandwiched between the pair of flanges 21 and 22 is positioned so that the center in the width direction coincides with the center in the axis L direction of the support shaft 20.

(Roll paper replacement operation)
When the recording paper 3 is used to the end by printing, the roll core 2 of the roll paper 2 remains in the roll paper holder 7. In order to load a new roll paper 2 into the roll paper holder 7 from this state, first, the support shaft 20 is removed from the support portion 23, and the support portion 23 is taken out of the roll paper holder 7. Thereafter, the operating member 41 is moved to the open position 41B, and the lock members 40 (1), 40 (2), and 40 (3) are moved to the retracted position 40B inside the cylinder portion 30. Thereafter, one flange 22 is extracted from the support shaft 20, and the core 4 is further extracted from the support shaft 20.

  Next, a new roll paper 2 is set on the support shaft 20. That is, the cylindrical portion 30 of the support shaft 20 is inserted into the core 4 of the new roll paper 2. Then, the removed flange 22 is attached to the cylindrical portion 30. Thereafter, the mounted flange 22 is pressed against the end surface of the roll paper 2 to move the direction of the axis L toward the center of the cylindrical portion 30. When the guide protrusion 64 of the flange 22 and the engagement protrusion 65 of the rack gear 62 are engaged by this operation, the flange 21 moves toward the center in the axis L direction as the flange 22 moves. As a result, when the inner surface of the flange 22 in the direction of the axis L and the inner surface of the flange 21 in the direction of the axis L are in contact with the end surface of the roll paper 2, the roll paper 2 is disposed at the center of the cylindrical portion 30. .

  Here, when the operation member 41 is moved from the open position 41B to the lock position 41A, the lock members 40 (1), 40 (2), 40 (3) move to the protruding position 40A and the roll core of the roll paper 2 is moved. 4 abuts against the inner peripheral surface. Further, the lock members 40 (1), 40 (2), and 40 (3) abut against the inner peripheral surface of the center hole 35 of the pair of flanges 21 and 22. As a result, the roll paper 2 and the pair of flanges 21 and 22 are fixed to the cylindrical portion 30 of the support shaft 20.

  Thereafter, when the support shaft 20 in a state where the roll paper 2 is fixed is mounted on the support portion 23, the roll paper 2 is loaded into the roll paper holder 7 so as to be able to roll together with the support shaft 20. When the support shaft 20 is mounted on the support portion 23, the recording paper 3 pulled out from the roll paper 2 is placed in the paper conveyance path 8 so that the paper feed roller pair 11 can nip the recording paper 3. And Accordingly, the recording paper 3 can be transported by the transport mechanism 14.

(Function and effect)
According to this example, the lock member 40 (1), 40 (2), 40 (3) is moved to the support shaft by displacing the operation member 41 provided on the support shaft 20 from the lock position 41A to the open position 41B. Since the cylindrical portion 30 of the support shaft 20 can be fitted into the core 4 of the roll paper 2, the core 4 and the lock members 40 (1), 40 (2 ), 40 (3) can be prevented from interfering with each other. In addition, the operation member 41 provided on the support shaft 20 is displaced from the open position 41B to the lock position 41A, so that the lock members 40 (1), 40 (2), and 40 (3) are wound around the roll paper 2 core. 4 can protrude outward from the outer peripheral surface 30a of the cylindrical portion 30 of the support shaft 20 inserted into the support shaft 20. Therefore, after the roll paper 2 is fitted into the cylindrical portion 30 of the support shaft 20, the lock members 40 (1), 40 (2), 40 (3) are simply operated by operating the operation member 41 provided on the support shaft 20. ) Is brought into contact with the inner peripheral surface of the core 4 of the roll paper 2 so that the roll paper 2 can be fixed to the support shaft 20. In addition, the operating member 41 provided on the support shaft 20 is displaced from the lock position 41 </ b> A to the open position 41 </ b> B, so that the lock members 40 (1), 40 (2), and 40 (3) are cylindrical portions of the support shaft 20. 30, when the cylindrical portion 30 of the support shaft 20 is fitted into the core 4 of the roll paper 2, the core 4 and the lock members 40 (1), 40 (2), 40 ( 3) Interference can be avoided. Therefore, the operation of setting the roll paper 2 on the support shaft 20 and the operation of fixing the roll paper 2 set on the support shaft 20 to the support shaft 20 are facilitated.

  Further, in this example, the support shaft 20 is configured such that when the lock members 40 (1), 40 (2), and 40 (3) at the protruding position 40A are pushed toward the retracted position 40B, the lock member 40 is moved. (1), 40 (2), 40 (3) is provided with a coil spring 51 that exerts a biasing force that biases the protruding position 40A toward the projecting position 40A. As a result, the roll paper 2 can be fixed to the support shaft 20 by using the urging force of the coil spring 51, so even if the diameter of the winding core 4 varies for each roll paper 2 to be used, The roll paper 2 can be fixed.

  Furthermore, in this example, when the operation member 41 is moved to the lock position 41A, the three lock members 40 (1), 40 (2), and 40 (3) protrude outside the cylindrical portion 30 at equal angular intervals. Further, the lock members 40 (1), 40 (2), and 40 (3) are in contact with the core 4 over the entire range of the roll paper 2 in the width direction. Therefore, the roll paper 2 can be securely fixed to the support shaft 20. Furthermore, the lock members 40 (1), 40 (2), 40 (3) and the link mechanism 42 that moves the lock members 40 (1), 40 (2), 40 (3) to the protruding position 40A are parallel links. Since the mechanism is configured, the locking members 40 (1), 40 (2), 40 (3) protrude in the direction of the axis L when protruding from the openings 44 (1), 44 (2), 44 (3). The amount becomes uniform, and the roll paper 2 is suppressed from being inclined with respect to the support shaft 20. Further, since the three lock members 40 (1), 40 (2), and 40 (3) protrude outside the cylindrical portion 30 at equal angular intervals, the rolling center of the roll paper 2 and the center axis L of the support shaft 20 are provided. Can be matched.

  Next, in this example, the roll paper holder 7 includes a pair of flanges 21 and 22 that sandwich the roll paper 2 on both sides in the width direction of the roll paper 2, so that when the recording paper 3 is pulled out from the roll paper 2, It is possible to prevent the recording paper 3 from being pulled out obliquely. Further, when the recording paper 3 is wound on the roll paper 2, it is possible to prevent the recording paper 3 from being wound up obliquely. Further, since the pair of flanges 21 and 22 are fixed to the support shaft 20 by the lock members 40 (1), 40 (2), and 40 (3) moved to the protruding position 40A, the pair of flanges 21 and 22 are connected to the axis L. There is no need to provide a separate mechanism for preventing movement in the direction. Therefore, the manufacturing cost of the apparatus can be suppressed.

  In this example, since the flange moving mechanism 43 that moves the one flange 22 and the other flange in the direction opposite to the axis L direction is provided, the roll paper 2 can be positioned with reference to the center of the cylindrical portion 30. it can. As a result, the recording paper 3 can be fed out from the center of the cylindrical portion 30 and the recording paper 3 can be taken up at the center of the cylindrical portion 30.

  Further, in this example, since the support shaft 20 is detachably supported by the support portion 23, the roll paper 2 can be set on the support shaft 20 with the support shaft 20 removed from the support portion 23. The operation of setting the roll paper 2 on the support shaft 20 is easy. Further, since the roll paper 2 is fixed to the support shaft 20 in the roll paper holder 7, if the support shaft 20 is rotationally driven by the support shaft drive mechanism 24, the roll paper 2 is forcibly rotated to record the recording paper 3. Can be wound on the roll paper 2.

(Modified example of roll paper holder)
FIG. 6 is a schematic perspective view of a modified roll paper holder. FIG. 7 is an explanatory diagram of the support shaft and shows a state in which the lock member is in a protruding position protruding from the outer peripheral surface of the cylindrical portion of the support shaft. 7A is a side view of the support shaft viewed from the operation member side, FIG. 7B is a schematic cross-sectional view of the cylindrical portion of the support shaft, and FIG. 7C is FIG. 7B. It is sectional drawing of the support shaft in the BB line. FIG. 8 is an explanatory diagram of the support shaft and shows a state in which the lock member is in the retracted position inside the cylindrical portion of the support shaft. 8A is a side view of the support shaft viewed from the operation member side, FIG. 8B is a schematic cross-sectional view of the cylindrical portion of the support shaft, and FIG. 8C is FIG. 8B. It is sectional drawing of the support shaft in the BB line.

  As shown in FIG. 6, the roll paper holder 7 </ b> A of this example includes a support shaft 68 that supports the roll paper 2, a support portion 69 that rotatably supports the support shaft 68, and a support shaft that rotationally drives the support shaft 68. A drive mechanism 70 is provided. The support shaft 68 is disposed with its axis L1 directed in the printer width direction. When the roll paper 2 is loaded in the roll paper holder 7 </ b> A, the roll paper 2 is fixed to the support shaft 68 in a state where the support shaft 68 is fitted in the core 4.

  The support shaft 68 includes a cylindrical portion 71 fitted into the core 4 of the roll paper 2 and a small-diameter portion 72 that protrudes coaxially from one end portion of the cylindrical portion 71 in the axis L1 direction. The support portion 69 includes a support hole 73 into which the small-diameter portion 72 is inserted, and supports the support shaft 68 so as to be rotatable in a cantilever state. The support shaft 68 is attached to the support portion 69 by inserting the small diameter portion 72 into the support hole 73 from the direction of the axis L1, and is supported by moving the support shaft 68 in the direction away from the support portion 69 in the direction of the axis L1. The shaft 68 can be removed from the support portion 69. That is, the support shaft 68 is supported by the support portion 69 in a detachable state. The support shaft drive mechanism 70 includes a support shaft drive motor 74 and a drive force transmission mechanism 75 that transmits the drive force of the support shaft drive motor 74 to the support shaft 68.

  As shown in FIGS. 7 and 8, the support shaft 68 is equipped with a lock member 76, an operation member 77, and a link mechanism 78 that moves the lock member 76 in conjunction with the operation of the operation member 77.

  The lock member 76 is formed of an elastic body such as resin or rubber. The lock member 76 protrudes from an opening 79 formed on the outer peripheral surface 71 a of the cylindrical portion 71 (see FIG. 8) and the outer periphery of the cylindrical portion 71. It can move between the retreat positions 76B (see FIG. 7) inside the surface 71a. Here, as shown in FIG. 8C, openings 79 (1), 79 (2), 79 (79) are formed on the outer peripheral surface 71 a of the cylindrical portion 71 as openings 79 at three equiangular intervals in the circumferential direction. 3) is provided. As shown in FIG. 6, each of the openings 79 (1), 79 (2), 79 (3) is provided in the central portion of the cylindrical portion 71 in the direction of the axis L1. Further, as shown in FIGS. 7 and 8, the support shaft 68 has a first, second, and third locking members 76 protruding from the openings 79 (1), 79 (2), and 79 (3). Third lock members 76 (1), 76 (2), and 76 (3) are mounted.

  As shown in FIGS. 7B and 8B, the operating member 77 includes a large-diameter disk portion 80 on which operating ridges 77a are formed, and an outer peripheral surface having a smaller diameter than the large-diameter disk portion 80. Is provided with a small-diameter disk portion 81 in which an operating member-side gear 81 a is formed, and the small-diameter disk portion 81 is inserted inside the cylindrical portion 71. The operation member 77 is rotatably attached to a blocking member 82 that closes the opening on the opposite side of the small diameter portion 72 in the cylindrical portion 71, and is released from the lock position 77A set at a different angular position around the axis L1. Rotate between positions 77B. In this example, the lock position 77A and the release position 77B are set to angular positions that are 90 degrees apart about the axis L1.

  The link mechanism 78 includes one cam 83, a transmission mechanism 84 that transmits the rotation of the operation member 77 to the cam 83 and rotates the cam 83, and a cam follower that is in sliding contact with a cam surface 87 provided on the outer peripheral surface of the cam 83. 85 and a link member 86 that is displaced as the cam 83 rotates. Here, the link mechanism 78 includes the first link member 86 (1), to which the first, second, and third lock members 76 (1), 76 (2), and 76 (3) are respectively attached as the link member 86. A second link member 86 (2) and a third link member 86 (3) are provided.

  The cam 83 has a rectangular parallelepiped shape as a whole, and includes an end face 83a that is rectangular when viewed from the direction of the axis L1. As shown in FIGS. 7C and 8C, the rotation center axis of the cam 83 extends in the direction parallel to the axis L1 at the center of the cross section having the same shape as the end face 83a. In the cam 83, an outer peripheral surface portion extending in parallel with the axis L1 is a cam surface 87, and the cam surface 87 is a first cam surface portion 87a, a second cam surface portion 87b, and a third cam surface in the clockwise direction. A portion 87c and a fourth cam surface portion 87d are provided. The first cam surface portion 87a and the third cam surface portion 87c are surfaces extending in the direction of the axis L1 from the pair of short sides of the end surface 83a of the cam 83, and are parallel to each other. The second cam surface portion 87b and the fourth cam surface portion 87d are surfaces extending in the direction of the axis L1 from the pair of long sides of the end surface 83a, and are parallel to each other.

  The transmission mechanism 84 includes a rotation shaft 88 connected to the cam 83 and a link mechanism side gear 89 fixed coaxially to one end of the rotation shaft 88. The rotation shaft 88 extends through the cam 83 in the direction of the axis L 1, and the rotation center line of the rotation shaft 88 coincides with the rotation center line of the cam 83. The link mechanism side gear 89 meshes with the operation member side gear 81a of the operation member 77, and when the operation member 77 is rotated about the axis L1, the rotation shaft 88 rotates. Therefore, when the operation member 77 is rotated about the axis L1, the cam 83 rotates about the rotation center axis. In this example, when the operation member 77 is displaced from the open position 77B to the lock position 77A, the operation member 77 is rotated 90 ° counterclockwise (in the direction of the arrow in FIG. 7A). As a result, the cam 83 rotates 90 ° clockwise (in the direction of the arrow in FIG. 7C).

  The first link member 86 (1) is movable in the radial direction perpendicular to the axis L1. As shown in FIGS. 7B and 8B, the first link member 86 (1) includes a plate portion 91 and a pair of frame portions 92 provided at both end portions of the plate portion 91 in the axis L1 direction. It has. The plate portion 91 has a first cam follower 85 whose inner surface in the radial direction is slidable in contact with the first cam surface portion 87a, and a lock member fixing portion that fixes the first lock member 76 (1) to the outer surface. 90 is provided. The pair of frame portions 92 sandwich the cam 83 from both sides in the direction of the axis L1. Each frame portion 92 is provided in parallel with a pair of parallel frame portions 92a extending inward from both ends in the circumferential direction of the plate portion 91, and the inner ends of the pair of parallel frame portions 92a. A connecting frame portion 92b is provided. Here, in the cam 83, on the both sides in the axis L1 direction of the fourth cam surface portion 87d extending in the direction of the axis L1 from one long side of the end surface 83a, a position separated from the fourth cam surface portion 87d in the direction of the axis L1. The protrusion 93 is provided on the outer surface of the connecting frame portion 92b (the surface facing the plate portion 91).

  The second link member 86 (2) and the third link member 86 (3) have the same arc shape, and are opposed to the respective recessed sides on both sides of the axis line L 1 of the cylindrical portion 71. It is arranged in the state of letting. Each of the second link member 86 (2) and the third link member 86 (3) is a cam follower 85 whose one end portion is in sliding contact with the cam surface 87, and the other end side portion is a second lock member. The lock member fixing portion 90 fixes the 76 (2) or the third lock member 76 (3). Further, the second link member 86 (2) and the third link member are supported so as to be swingable around a swing shaft 94 provided between the cam follower 85 and the lock member fixing portion 90. The swing shaft 94 extends in parallel with the axis L1.

  The link mechanism 78 includes a coil spring (spring member) 95. The coil spring 95 has one end attached to a portion between the swing shaft 94 of the second link member 86 (2) and the cam follower 85, and the other end swinging the third link member 86 (3). The second link member 86 (2) and the third link member 86 (3) are attached in a direction in which the cam follower 85 abuts the cam surface 87. It is fast. In addition, the coil spring 95 is pushed by the lock members 76 (2) and 76 (3) toward the retracted position 76B in a state where the lock members 76 (2) and 76 (3) are arranged at the protruding position 76A. Sometimes, the urging force that urges the lock members 76 (2) and 76 (3) toward the protruding position 76A is exhibited.

  Here, as shown in FIG. 7, when the operation member 77 is disposed at the open position 77B, the first, second, and third lock members 76 (1), 76 (2), and 76 (3) are at the retracted position 76B. Be placed.

  That is, in the state where the operation member 77 is disposed at the open position 77B, the cam follower 85 of the second link member 86 (2) is slidably contacted with the first cam surface portion 87a of the cam 83, as shown in FIG. Therefore, the second link member 86 (2) swings around the swing shaft 94 and displaces the lock member fixing portion 90 to the inner peripheral side. At the same time, the cam follower 85 of the third link member 86 (3) slides in contact with the third cam surface portion 87 c of the cam 83 and moves to the outer peripheral side, so that the third link member 86 (3) moves around the swing shaft 94. It swings to displace the lock member fixing portion 90 to the inner peripheral side. Accordingly, the second and third lock members 76 (2) and 76 (3) move to the inside of the cylindrical portion 71 and are disposed at the retracted position 76B. At this time, the protrusion 93 provided on the cam 83 comes into contact with the connection frame portion 92b of the first link member 86 (1). As a result, the first link member 86 (1) is prevented from moving outward in the radial direction, so the first lock member 76 (1) fixed to the first link member 86 (1) is The state of being disposed at the retracted position 76B inside the cylindrical portion 71 is maintained.

  Next, as shown in FIG. 8, when the operation member 77 is rotated 90 ° counterclockwise from the open position 77B to the lock position 77A, the link mechanism 78 is moved to the first, second, and third lock members 76 (1). , 76 (2), 76 (3) are moved from the retracted position 76B to the protruding position 76A.

  More specifically, when the operation member 77 is rotated from the lock position 77A to the release position 77B, the rotation shaft 88 rotates and the cam 83 rotates 90 ° clockwise. As a result, as shown in FIG. 8, the cam follower 85 (the inner surface of the plate portion 91) of the first link member 86 (1) is in sliding contact with the first cam surface portion 87 a of the cam 83. (1) moves the radial direction outward. As a result, the first lock member 76 (1) fixed to the lock member fixing portion 90 of the first link member 86 (1) is disposed at the protruding position 76A protruding outward from the tube portion 71. Further, when the rotating shaft 88 rotates to rotate the cam 83 by 90 ° counterclockwise, the cam follower 85 of the second link member 86 (2) is brought into sliding contact with the second cam surface portion 87b of the cam 83, and the inner periphery. Therefore, the second link member 86 (2) swings around the swing shaft 94 and displaces the lock member fixing portion 90 to the outer peripheral side. At the same time, the cam follower 85 of the third link member 86 (3) slides in contact with the fourth cam surface portion 87d of the cam 83 and moves to the inner peripheral side, so that the third link member 86 (3) rotates around the swing shaft 94. And the lock member fixing portion 90 is displaced to the outer peripheral side. Accordingly, the second and third lock members 76 (2) and 76 (3) are arranged at the protruding position 76 A that protrudes to the outside of the cylindrical portion 71.

  Here, when the operation member 77 is rotated 90 ° clockwise from the lock position 77A and disposed at the open position 77B, the rotating shaft 88 rotates and the cam 83 rotates 90 ° counterclockwise. As a result, the reverse operation is performed, and the link mechanism 78 moves the first, second, and third lock members 76 (1), 76 (2), and 76 (3) from the protruding position 76A to the retracted position 76B. Move.

  As described above, according to the present example, the lock members 76 (1), 76 (2), and 76 (3) are rotated by rotating the operation member 77 provided on the support shaft 68 from the lock position 77A to the release position 77B. Since the cylindrical portion 71 of the support shaft 68 can be retracted inside the cylindrical portion 71 of the support shaft 68, when the cylindrical portion 71 of the support shaft 68 is fitted into the core 4 of the roll paper 2, the winding core 4 and the lock members 76 (1), 76. (2) and 76 (3) can be prevented from interfering with each other. Further, by rotating the operation member 77 provided on the support shaft 68 from the open position 77B to the lock position 77A, the lock members 76 (1), 76 (2), and 76 (3) are wound around the core of the roll paper 2. 4 can protrude outward from the outer peripheral surface 71a of the cylindrical portion 71 of the support shaft 68 inserted into the support shaft 68. Therefore, after the roll paper 2 is fitted into the cylindrical portion 71 of the support shaft 68, the lock members 76 (1), 76 (2), 76 (3) are simply operated by operating the operation member 77 provided on the support shaft 68. ) Is brought into contact with the inner peripheral surface of the core 4 of the roll paper 2, so that the roll paper 2 can be fixed to the support shaft 68. Therefore, the operation of setting the roll paper 2 on the support shaft 68 and the operation of fixing the roll paper 2 set on the support shaft 68 to the support shaft 68 are facilitated.

  Further, in this example, the support shaft 68 includes the lock members 76 (2), 76 when the lock members 76 (2), 76 (3) at the protruding position 76A are pushed toward the retracted position 76B. A coil spring 95 that exerts a biasing force that biases (3) toward the protruding position 76A is provided. As a result, the roll paper 2 can be fixed to the support shaft 68 using the urging force of the coil spring 95. Therefore, even when the diameter of the winding core 4 varies for each roll paper 2 to be used, The roll paper 2 can be fixed.

  Further, in this example, when the operation member 77 is moved to the lock position 77A, the three lock members 76 (1), 76 (2), and 76 (3) protrude outside the cylindrical portion 71 at equal angular intervals. Therefore, the roll paper 2 can be reliably fixed to the support shaft 68. In addition, since the three lock members 76 (1), 76 (2), and 76 (3) project outside the cylindrical portion 71 at equal angular intervals, the rolling center of the roll paper 2 and the center axis L 1 of the support shaft 68. Can be matched.

  In this example, since the support shaft 68 is detachably supported by the support portion 69, the roll paper 2 can be set on the support shaft 68 with the support shaft 68 removed from the support portion 69. The work of setting the roll paper 2 on the support shaft 68 is easy. Further, since the roll paper 2 is fixed to the support shaft 68 in the roll paper holder 7A, if the support shaft 68 is rotationally driven by the support shaft drive mechanism 70, the roll paper 2 is forcibly rotated, and the recording paper 3 Can be wound on the roll paper 2.

  Here, also in the roll paper holder 7A of this example, the dimension of each opening 79 (1), 79 (2), 79 (3) in the direction of the axis L is the width dimension of the roll paper 2 loaded in the roll paper holder 7A. Can be longer. In this case, each lock member 76 (1), 76 (2), 76 (3) has a shape corresponding to each opening 79 (1), 79 (2), 79 (3), The dimensions of the lock members 76 (1), 76 (2), and 76 (3) in the direction of the axis L can be made longer than the width dimension of the roll paper 2 loaded in the roll paper holder 7.

  Further, when the dimension in the axis L direction of each lock member 76 (1), 76 (2), 76 (3) is made longer than the width dimension of the roll paper 2 loaded in the roll paper holder 7, The pair of flanges 21 and 22 and the flange moving mechanism 43 of the roll paper holder 7 may be mounted on the example roll paper holder 7A. In this way, the recording paper 3 can be fed out from the center of the cylindrical portion 71 of the support shaft 68 and the recording paper 3 can be wound around the center of the cylindrical portion 71. Further, the lock members 76 (1), 76 (2), and 76 (3) arranged at the protruding position 76 A are brought into contact with the inner peripheral surface of the center hole 35 of each flange 21, 22, so , 22 can be fixed to the cylindrical portion 71.

1 .... Printer, 2 .... Roll paper, 3 .... Recording paper, 4 .... Core, 5 .... Main body frame, 6 .... Discharge port, 7.7A ... Roll paper holder (Roll paper support mechanism) 8 .. Paper transport path 9.. Platen 10... Print head 11.. Paper feed roller pair 12.. Paper discharge roller pair 13.. Transport motor 14. Support shaft, 21 · 22 ·· Flange, 23 ·· Support portion, 24 ·· Support shaft drive mechanism, 30 ·· Tube portion, 30a ·· Outer peripheral surface, 31 ·· Small diameter portion, 32 ·· Large diameter portion, 33 ..Motor for driving support shaft, 34..Driving force transmission mechanism, 35..Center hole, 40.40 (1) to 40 (3) .. Lock member, 40A..Protruding position, 40B..Retraction position, 41..Operating member, 41A..Lock position, 41B..Open position, 42..Link mechanism, 4 ..Flange moving mechanism 44.44 (1) to 44 (3) .. Opening 45..engagement claw 46..engagement hole 47..bar-shaped frame 48..arm 49. ..First arm member 50 ..Second arm member 51 ..Coil spring (spring member) 52 ..Cylinder part 53 ..Bottom plate 54 ..First fixing part 55 ..Second fixing part , 60 ··· Guide groove, 61 · 62 · · Rack gear, 63 · · Pinion gear, 64 · · Projection for guide, 65 · · Engagement projection, 68 · · Support shaft, 69 · · Support portion, 70 · · · Support Axis drive mechanism 71 ·· cylinder part 71a · · outer peripheral surface 72 · · small diameter part 73 · · · support hole 74 · · · support shaft drive motor 75 · · · drive force transmission mechanism 76 · 76 (1 ) To 76 (3) .. Lock member, 76A .. Projection position, 76B .. Retraction position, 77. Member, 77a .. Projection, 77A .. Lock position, 77B .. Open position, 78 .. Link mechanism, 79. 79 (1) to 79 (3) .. Opening, 80 .. Large diameter disk part, 81 ..Small diameter disk part, 81a..Operation member side gear, 82..Sealing member, 83..Cam, 83a..End face, 84..Transmission mechanism, 85..Cam follower, 86 (1) .86 (2 ) · 86 (3) · · Link member, 87 · · Cam surface, 87a to 87d · · Cam surface portion, 88 · · Rotating shaft, 89 · · Link mechanism side gear, 90 · · Lock member fixing portion, 91 · · Plate portion, 92 ·· Frame portion, 92a · · Parallel frame portion, 92b · · Connection frame portion, 93 · · Projection, 94 · · Shaking shaft, 95 · · Coil spring (spring member), L · L1 · ·・ Axis, P ・ ・ Printing position

Claims (12)

In a roll paper support mechanism having a support shaft having a cylindrical portion fitted into a cylindrical winding core of roll paper, and a support portion that rotatably supports the support shaft,
The support shaft includes a lock member, a lock that is movable between a projecting position where at least a part projects outward from an opening formed in the outer peripheral surface of the cylindrical portion and a retracted position inside the outer peripheral surface of the cylindrical portion. An operation member displaceable between a position and an open position different from the lock position, and when the operation member is displaced from the lock position to the open position, the lock member is moved from the protruding position to the retracted position. And a roll paper support that includes a link mechanism that moves the lock member from the retracted position to the lock position when the operation member is displaced from the open position to the lock position. mechanism. In claim 1,
The link mechanism includes a spring member that exerts a biasing force that biases the lock member toward the protruding position when the lock member at the protruding position is pushed toward the retracted position. A roll paper support mechanism comprising the roll paper support mechanism. In claim 1 or 2,
The axial length of the cylindrical portion, and the axial length of the protruding portion of the locking member protruding from the opening at the protruding position are longer than the width of the roll paper. Feature roll paper support mechanism. In claim 3,
A pair of flanges attached to the cylindrical portion with the roll paper sandwiched from both sides in the width direction;
Each flange includes a center hole into which the cylindrical portion is inserted,
When the lock member moves to the protruding position with the cylindrical portion inserted into the center hole of each flange, the lock member and the inner peripheral surface portion of the center hole of each flange come into contact with each other, and the pair of pairs A roll paper support mechanism, wherein a flange is fixed to the tube portion. In claim 4,
When one of the pair of flanges is moved along the axis with the cylindrical portion inserted into the center hole of each flange, the other flange moves in the opposite direction to the one flange. A roll paper support mechanism comprising a flange moving mechanism to be moved. In any one of claims 1 to 5,
The operation member moves between the open position and the lock position that are separated on the axis,
The lock member is movable in a radial direction perpendicular to the axis,
The link mechanism includes a frame movable in the axial direction, and an arm having one end rotatably attached to the frame and the other end rotatably attached to the lock member,
The roll paper support mechanism, wherein the frame is connected to the operation member and moves integrally with the operation member. In claim 6,
The link mechanism is provided with two arms arranged at positions separated in the axial direction as the arms. In any one of claims 1 to 5,
The operating member rotates between the open position and the locked position set at different angular positions around the axis;
The link mechanism includes a cam, a transmission mechanism that transmits the rotation of the operation member to the cam to rotate the cam, and a cam follower that is in sliding contact with the cam surface of the cam, and is displaced as the cam rotates. A link member
The roll paper support mechanism, wherein the lock member is attached to the link member. In any one of claims 1 to 8,
A plurality of openings as the openings are provided at equiangular intervals in the circumferential direction on the outer peripheral surface of the cylindrical portion,
A roll paper support mechanism comprising a plurality of lock members corresponding to the plurality of openings as the lock member. In any one of claims 1 to 9,
The roll paper support mechanism, wherein the support shaft is supported by the support portion in a detachable state. A roll paper support mechanism according to any one of claims 1 to 10,
A transport mechanism for transporting a long recording paper drawn from the roll paper supported by the roll paper support mechanism along a transport path passing through a printing position;
A print head for printing on the recording paper conveyed through the printing position;
A printer comprising: In claim 11,
A printer comprising: a support shaft driving mechanism that rotationally drives the support shaft of the roll paper support mechanism.