JP2011245805A - Sheet feeding apparatus, printer, and paper feeding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding apparatus capable of smoothly performing each operation of drawing, feeding and printing, to provide a printer with the apparatus, and to provide a paper feeding method.SOLUTION: The sheet feeding apparatus 1 includes: a supporting unit 9 for slidably and rotatably supporting inner circumferential surfaces of winders 6, 7, which are formed by winding a medium 6 to be printed in a hollow shape, in a circumferential direction; and a pressing unit 11 for pressing a portion other than the outer circumferential surfaces of the winders by a pressing force having a radial direction component.

Description

  The present invention relates to a paper feeding device, a printer, and a paper feeding method applied to a printer that feeds a belt-shaped printing medium, prints on the surface of the printing medium, and cuts the printing medium after printing.

  Storage of a hollow cylindrical wound body formed by winding a printing medium such as a receipt, drawing out of the printing medium from the winding body, feeding of the printing medium, printing on the printing medium, after printing As a printer for cutting the print medium, there is a printer described in Patent Document 1, for example.

  When pulling out the print medium from the above-described wound body, a conveyance roller located on the downstream side of the print medium is used in the paper feeding device of the printer. Here, when stopping the rotation of the conveying roller to stop the drawing, the wound body continues to rotate after the rotation of the conveying roller is stopped by its own inertia moment, and stops due to friction. If the winding body continues to rotate after the rotation of the conveying roller is stopped, the printing medium between the conveying roller and the winding body is loosened.

  If such slack occurs, the feeding operation of the printing medium is delayed with respect to the start of rotation of the conveying roller when the conveying roller is started next time and the printing medium is fed, and the tension of the printing medium changes or passes. In order to cause fluctuations in the path, it is preferable that they are not generated as much as possible when performing drawing, feeding, and printing smoothly.

  In the paper feeding device used in the printer described in Patent Document 1, a flange that rotates integrally with the wound body is provided for the purpose of preventing this slackness, and the flange and the wound body are integrated. It is proposed that a brake force is applied by pressing a pressing member against the outer peripheral surface of the flange after being pivotally supported by a spring.

JP 2008-195484 A

  However, in such a sheet feeding device, when applying a braking force, an inertia moment due to the mass of the flange is added, and the necessary braking force increases. Therefore, the pressing member and the spring that operates the pressing member Increase in the number of parts due to the addition of the flange, an increase in the axial dimension of the wound body and the flange, and an increase in the mass contributing to the moment of inertia, leading to an increase in cost.

  In addition, when starting to pull out and send the print medium from the wound body by the transport roller, the required torque also increases due to the addition of the moment of inertia due to the mass of the flange, increasing the capacity of the motor that drives the transport roller. Invitation, this also increases costs.

  In addition, as the shaft of the wound body is supported by a spring, if the outer diameter of the wound body changes, the shaft support position also changes due to the change in its own weight. Again, there is a risk of hindering smooth execution of invitation, withdrawal, feeding, and printing. At the same time, a space for allowing the change in the pivotal support position is required, which causes an increase in the external dimensions of the apparatus in the front and back direction of the print medium, which also increases the cost.

  In view of the above problems, an object of the present invention is to provide a paper feeding device, a printer, and a paper feeding method capable of smoothly performing each operation of drawing, feeding, and printing without causing an increase in cost.

In order to solve the above problem, a paper feeding device according to the present invention includes:
A support means for supporting an inner peripheral surface of a wound body in which a printing medium is wound in a hollow shape so as to be slidably rotatable in a circumferential direction;
It includes a pressing means for pressing a portion other than the outer peripheral surface of the wound body with a pressing force having a radial component.

  The printer according to the present invention includes the paper feeding device.

In order to solve the above problem, a paper feeding method according to the present invention is as follows.
A support step for supporting the inner peripheral surface of the wound body in which the printing medium is wound in a hollow shape so as to be slidable and rotatable in the circumferential direction, and a portion other than the outer peripheral surface of the wound body with a radial component A pressing step of pressing with a pressing force is included.

  According to the paper feeding device, the printer, and the paper feeding method of the present invention, the drawing, feeding, and printing operations can be smoothly executed without increasing the cost.

It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a timing chart which shows the operation | movement form of one Embodiment of the receipt printer unit which concerns on this invention. It is a timing chart which shows the operation | movement form of the conventional printer used as the comparison object of one Embodiment of the receipt printer unit which concerns on this invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention. It is a schematic diagram showing one embodiment of a receipt printer unit according to the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram illustrating an embodiment of a receipt printer unit 1 according to the first embodiment. FIG. 2 is a schematic diagram illustrating a main part of one embodiment of the receipt printer unit 1 according to the first embodiment. The upper view in FIG. 1 shows a right view, and the lower view in FIG. 1 and FIG. 2 show an upper view. 1 and 2, F indicates the front side that forms the exit side, R indicates the right side in the left-right direction as viewed from the F side, and U indicates the vertical direction for convenience that is perpendicular to the front side F and the right side R. The upper side of is shown.

  The receipt printer unit 1 according to the first embodiment includes a printing unit 2 and a paper feeding device 3 as shown in FIG.

  The printing unit 2 includes a printing head 4, a paper feed roller 5 (conveying means), a feed motor that drives the paper feed roller 5, a fixed blade support unit (not shown), and a movable blade support unit. A movable blade, a cutting motor, a driving gear driven by the cutting motor, and a transmission gear for transmitting power from the driving gear to the movable blade.

  Both end portions of the paper feed roller 5 constitute engaged portions that are engaged in a closed state by a hook portion (not shown). In the closed state, the drive gear disposed on the fixed blade support portion and the movable blade support The transmission gear arranged in the section is engaged.

  In the open state, the movable blade support portion is flipped up in a direction away from the fixed blade support portion by swinging of an arm portion (not shown), and the drive coupling between the drive gear and the transmission gear is released.

  The paper feed device 3 includes a paper 6, a roll paper core 7, a roll paper 8, a paper feed shaft 9, and a roll paper holding unit 10.

  The paper 6 constituting the print medium is inserted between the printing head 4 and the paper feed roller 5 and is cylindrical as shown in the right side of the upper view and the upper side of the lower view in FIG. The roll paper core 7 is wound around the outer peripheral surface to constitute a wound body.

  The roll paper 8 and the inner peripheral surface of the roll paper core 7 as the wound body are supported by the paper feed shaft 9 so as to be slidable and rotatable in the circumferential direction. As shown in the lower side view of FIG. 1, both ends of the paper feed shaft 9 are fixed to a pair of left and right roll paper holders 10. The roll paper holding unit 10 forms a part of a housing (not shown).

  That is, the paper feed shaft 9 has a roll paper 8 and a roll paper core 7 which are wound bodies in which the paper 6 as a printing medium is wound in a hollow shape. Based on the contact with the inner peripheral surface of the wound body, a support means for supporting sliding and rotation in the circumferential direction is configured.

  As shown on the left side of the upper diagram in FIG. 1, the paper 6 passes through a path from the print head 4 and the paper feed roller 5, between the movable blade and the fixed blade, and to the outlet. The paper 6 is pulled out from the roll paper 8 constituting the wound body by the rotation of the paper feed roller 5 in accordance with the driving of the motor, sent, and printed by the printing unit 2. In the movable blade support portion, the printed paper 6 is cut at an appropriate location by moving the movable blade forward and backward based on the driving force of the cutting motor transmitted to the transmission gear.

  As shown in FIG. 2, the printer 1 according to the first embodiment includes a roller 11, a rotating shaft 12, a spring 13, and a spring 14. The roller 11 is configured to have a partial conical shape having a diameter that increases toward the outer side in the radial direction of the roll paper 8 and the apex is cut off, and the rotation shaft 12 is disposed so as to be directed inward in the radial direction of the roll paper 8. Both ends of the rotating shaft 12 are connected to a housing (not shown) by a pair of springs 13 and 14 arranged so as to be oriented in the axial direction of the roll paper 8.

  The rotating shaft 12 is urged to the right in FIG. 2 by the urging force accompanying the compression based on the interference of the spring 13 and the spring 14 with the roll paper 8, and with the urging of the rotating shaft 12 to the right. The conical surface 11a of the roller 11 is a portion other than the outer peripheral surface of the roll paper 8, and is urged by a part in the circumferential direction of a circular edge 8a that forms a boundary between the outer peripheral surface and the axial end surface.

  As shown in FIG. 2, the conical surface 11a of the roller 11 is inclined with respect to the axial end surface and the outer peripheral surface of the roll paper 8, so that the circular surface 11 is urged from the left to the right. When contacted with the edge 8a, the roll paper 8 is pressed with a pressing force having a component in the radial direction of the roll paper 8, here a component in the direction toward the inside in the radial direction. That is, the roller 11 constitutes a pressing unit.

  Further, the housing (not shown) is provided with a lock claw (not shown) that can swing around the radial direction of the roll paper 8. For example, when the roll paper 8 is exchanged in an open state, the lock claw is provided. Thus, both ends of the rotary shaft 12 are selectively fixed at positions spaced leftward from the roll paper 8. Note that the paper feeding method of the present invention is also executed in the operation of drawing and feeding the paper 6 in the receipt printer unit 1 of the first embodiment.

  In the receipt printer unit 1 of the first embodiment, the following operational effects can be obtained. The biasing force from the left side to the right side in FIG. 8 by the spring 13 and the spring 14 on the conical surface 11a of the roller 11 is converted into a pressing force having a radial component on the contact surface between the conical surface 11a and the circular edge 8a. Thus, the frictional force generated by this pressing force can be applied in the direction opposite to the rotation direction θ in the upper view of FIG. The roller 11 also constitutes conversion means for converting the pressing force into a frictional force.

  By using this frictional force as a braking force in the direction opposite to the rotational direction θ, the period during which the roll paper 8 continues to rotate after the stop of the feed motor that drives the drive gear can be shortened as much as possible. Based on the shortening of the rotation period, it is possible to prevent as much as possible the slack of the paper 6 as shown by the one-dot chain line R1 in the upper diagram in FIG.

  Further, in the first embodiment, when the friction force is generated, it is possible to avoid the roller 11 from coming into contact with the outer peripheral surface serving as the printing surface of the paper 6, so that the printing surface is stained or wrinkled. Can also be prevented.

  Advantages of preventing the slack of the paper 6 drawn out from the roll paper 8 will be described below with reference to the drawings. FIG. 3 is a time chart showing the temporal change of the drawing speed VI of the paper 6 of the paper feeding roller 5 and the feeding speed VO of the roll paper 8 with respect to the time T in the first embodiment in parallel vertically. FIG. 4 is a time chart showing changes with time of the pull-in speed VI and the feed-out speed VO in parallel with each other in the prior art not including the roller 11.

  In the prior art shown in FIG. 4, the roll paper 8 is continuously rotated by the moment of inertia accompanying the mass of the roll paper 8 after the driving of the feed motor and the paper feed roller 5 is stopped, as shown in the lower side view. That is, “slow deceleration” and “delay” D1 occur.

  In this case, the roll paper 8 and the paper feed roller are also driven as shown in the upper diagram of FIG. 4 even when the paper feed roller 5 is started again and the paper feed roller 5 is started to resume the paper feed. The presence of slack in the paper 6 between 5 and 5 causes a “response delay” D2 of the rotation of the roll paper 8.

  In the first embodiment shown in FIG. 3, the frictional force generated with the pressing force of the roller 11 is applied to the roll paper 8 in the direction opposite to the rotational direction θ shown in FIG. Compared to that shown in FIG. 4, the period D <b> 1 during which “rolling of deceleration” occurs in which the roll paper 8 continues to rotate due to the moment of inertia accompanying the mass of the roll paper 8 after the drive of the paper feed roller 5 is stopped. Can be made extremely short.

  In this case, the slack existing in the paper 6 between the roll paper 8 and the paper feed roller 5 even when the paper feed roller 5 is started again and the paper feed roller 5 is started to resume the paper feed. The “response delay” D2 of the rotation of the roll paper 8 can be suppressed as much as possible as compared with the prior art.

  In addition, in the first embodiment, the rotary shaft 12 is connected to a housing (not shown) via a spring 13 and a spring 14 and is urged so as to approach the roll paper 8 in the axial direction. When the roll paper 8 has a larger diameter L than the reference diameter, the large diameter position LP of the conical surface 11a of the roller 11 contacts the circular edge 8a, and the roll paper 8 has a smaller diameter than the reference diameter. In the case of S, the small-diameter position SP of the conical surface 11a comes into contact with the circular edge 8a. Here, the reference diameter may be intermediate between the large diameter L and the small diameter S, and may be an average, for example.

  When the large-diameter position LP is in contact with the circular edge 8a, the strokes of the spring 13 and the spring 14 are smaller than the stroke at the reference diameter as shown in FIG. The pressing force with which the surface 11a presses the roll paper 8 increases.

  When the small-diameter position SP is in contact with the circular edge 8a, the strokes of the spring 13 and the spring 14 are larger than the stroke at the reference diameter as shown in FIG. The pressing force with which 11a presses the roll paper 8 is reduced.

  As described above, when the roll paper 8 has a large diameter, the pressing force is increased to increase the frictional force, so that the moment of inertia of the roll paper 8 increases as the diameter increases. The frictional force can also be increased. At the same time, when the roll paper 8 has a small diameter, the pressing force is reduced to reduce the frictional force, and the frictional force is also reduced corresponding to the fact that the moment of inertia of the roll paper 8 is reduced with the small diameter. Can be small.

  That is, according to the diameter of the roll paper 8, if the diameter is large, the pressing force and the friction force are increased, and if the diameter is small, the pressing force and the friction force are decreased to optimize the pressing force and the friction force. In addition, it is possible to enhance the effect of removing slack and to avoid applying unnecessary pressing force to the roll paper 8 as much as possible. This also allows the paper 6 to be drawn out, fed, and printed smoothly.

  In addition, in the first embodiment, when the frictional force is applied, the roll paper 8 and the roll paper core 7 are not configured to add another component that causes the addition of the moment of inertia. The frictional force is not increased, and the roller 11 and the spring 13 for operating the roller 11 and the spring 14 are not increased in size. For this reason, an increase in the number of parts, an increase in the axial dimension of the wound body including the roll paper 8, an increase in mass contributing to the moment of inertia, and an increase in cost can be prevented.

  In addition, when starting to pull out and feed the paper 6 from the roll paper 8 by the paper feed roller 5, it is possible to avoid an increase in the torque required for the feed motor due to an increase in the number of parts and addition of an inertia moment, It is possible to prevent an increase in the capacity of the feed motor that drives the paper feed roller 5 and an increase in cost.

  In the first embodiment, the axial support of the inner peripheral surfaces of the roll paper 8 and the roll paper core 7 is not based on a spring, and therefore the support position is changed in accordance with the change of the outer diameter of the roll paper 8. It will not change.

  For this reason, even if the outer diameter of the roll paper 8 changes, the path of the paper 6 does not fluctuate, and smooth execution of drawing, feeding, and printing can be realized. Further, since there is no change in the shaft support position of the roll paper 8, it is possible to omit a mechanism for absorbing the change and to save space, leading to an increase in the front and back dimensions of the paper 6 of the receipt printer unit 1. Therefore, it is possible to prevent an increase in cost.

  A configuration that can be added to the configuration shown in the first embodiment will be described. FIG. 5 is a schematic diagram illustrating a mechanism that can be added to the receipt printer unit 1 according to the first embodiment.

  As shown in FIG. 5, in a path between the roll paper 8 and the printing unit 2, an arm 15 that can swing in the ω direction around the axial direction of the roll paper 8 and a tension provided at the tip of the arm 15. The roller 16 and an actuator (not shown) that swings the arm 15 as appropriate can be included. The arm 15 and the tension roller 16 constitute tension adjusting means for the paper 6.

  According to this, the slack of the paper 6 that cannot be removed by the roller 11 shown in the first embodiment is appropriately swung out by appropriately swinging the arm 15 in the ω direction and appropriately pulling out the paper 6 from the roll paper 8. Can be removed.

  In the first embodiment, when the roller 11 is not used, the rotary shaft 12 is engaged with the lock claw. However, the central shaft side of the roll paper 8 of the rotary shaft 12 can be swung freely. The lever may be provided on the radially outer side. The second embodiment will be described below.

  FIG. 6 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the second embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  As shown in FIG. 6, in the second embodiment, in addition to the roller 11, the rotary shaft 12, the spring 13, and the spring 14 shown in FIG. 1, the lower end portion of the rotary shaft 12 in FIG. 6, and the upper end of the rotary shaft 12 in FIG. 6 is connected to a switching lever 18 that is swingable about a swing shaft 17 directed in the upward direction U via a hinge 19. ing.

  The rocking shaft 17 includes a click mechanism (not shown), and the rocking angle of the switching lever 18 is maintained unless an operator applies a certain amount of force to the end of the switching lever 18.

  According to the configuration of the second embodiment, the roller 11 can be selectively brought into contact with the circular edge 8a of the roll paper 8 when the switching lever 18 is swung leftward in FIG. When it is swung to the right, the roller 11 can be separated from the circular edge 8a of the roll paper 8 so as not to contact. That is, the use / non-use of the roller 11 and the application / non-application of the frictional force can be appropriately selected.

  In the first embodiment described above, the roller 11 has a conical shape and is disposed on only one of both ends of the roll paper 8 in the axial direction, but may be provided on both ends of the roll paper 8 in the axial direction. The third embodiment will be described below.

  FIG. 7 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the third embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  As shown in FIG. 7, in the third embodiment, in addition to the roller 11, the rotary shaft 12, the spring 13, and the spring 14 shown in FIG. 1, these sets are symmetric with respect to the center in the left-right direction in FIG. The roll paper 8 is also placed on the right end of the roll paper 8.

  As described above, the roller 11 is provided at both ends, and the pair of left and right rollers 11 are brought into contact with the pair of circular edges 8a located at both ends of the roll paper 8 in the axial direction, respectively. When the same radial force is applied and the same frictional force is applied, the spring constants of the springs 13 and 14 can be set small.

  Furthermore, in the third embodiment, the axial component of the pressing force of the left roller 11 and the axial component of the pressing force of the right roller 11 can be offset in the opposite directions. That is, the axial force in the direction in which the outer diameter side of the roll paper 8 is deviated from the inner diameter side can be made as small as possible, and the outer peripheral side of the roll paper 8 can be prevented from shifting with respect to the roll paper core 7 as much as possible.

  In the above-described first embodiment, the conical surface 11a of the roller 11 is described as not elastically deformed. However, the roller 11 may be positively elastically deformed as an elastic member. Hereinafter, Example 4 will be described.

  FIG. 8 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the fourth embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  As shown in FIG. 8, in the fourth embodiment, the roller 11 shown in FIG. 1 is made of an elastic member such as rubber. Since the conical surface 11a of the roller 11 is elastically deformed, the conical surface 11a faces the circular edge 8a of the conical surface 11a with the transition from the state B before the contact with the circular edge 8a of the roll paper 8 to the state A after the contact. As shown in FIG. 8A, the surface is deformed in the direction of indenting in the shape of a “<” with the contact surface as the maximum depression point.

  In the fourth embodiment, due to this deformation, when the roller 11 is biased from the left to the right in FIG. 8 by the spring 13 and the spring 14 shown in FIG. The angle of the contact surface at the position to be moved can be a deeper angle with respect to the radial direction of the roll paper 8. For this reason, the pressing force generated by the urging force from the left side to the right side in FIG. 8 by the spring 13 and the spring 14 can be converted into a force having a large radial component.

  Accordingly, the generated frictional force can be further increased, and the axial displacement of the outer peripheral surface of the roll paper 8 with respect to the roll paper core 7 can be minimized.

  In the first to fourth embodiments described above, the roller 11 has a conical shape, but may have a cylindrical shape. Hereinafter, Example 5 will be described.

  FIG. 9 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the fifth embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  The roller 11 of the fifth embodiment is formed in a cylindrical shape as shown in FIG. 9 and is supported so as to be rotatable in the circumferential direction of the rotary shaft 12. The lower end of the rotary shaft 12 in FIG. 9 is connected to a housing (not shown) so as to be swingable through a swing shaft 20 pointing in the direction, and the upper end in FIG. 9 of the rotary shaft 12 is connected to a housing (not shown) through a spring 13 pointing in the right direction R. The

  The cylindrical surface 11a forming the outer peripheral surface of the roller 11 is brought into contact with the circular edge 8a on the left side of the roll paper 8 in FIG. 9 based on the biasing force of the spring 13, and the contact surface with the cylindrical surface 11a of the roller 11 by this biasing force. , A pressing force including a radial component is generated, and a frictional force is applied in the circumferential direction of the roll paper 8 and in the direction opposite to the drawing direction of the paper 6 based on the pressing force.

  As shown in the upper side view of FIG. 9, when the roll paper 8 is in a state LD having a larger diameter than the reference diameter, the contact surface between the circular edge 8 a and the cylindrical surface 11 a is the view of the rotary shaft 12. 9, the stroke of the spring 13 is reduced, and the spring 13 generates a larger urging force, so that the pressing force acting on the contact surface is increased, and the frictional force is also increased. Here, the reference diameter may be an average value between the large diameter and the small diameter.

  As shown in the lower side view in FIG. 9, when the roll paper 8 is in a state SD having a smaller diameter than the reference diameter, the contact surface between the circular edge 8 a and the cylindrical surface 11 a is the view of the rotary shaft 12. 9, the stroke of the spring 13 is increased, the spring 13 generates a smaller urging force, the pressing force acting on the contact surface is reduced, and the frictional force is also reduced.

  Therefore, also in the fifth embodiment using the cylindrical roller 11, as in the case of the conical roller 11 shown in the first embodiment, an appropriate pressing force is set according to the diameter of the roll paper 8. The frictional force can be selected as appropriate. In addition, the cylindrical roller 11 of the sixth embodiment can also be configured by an elastic member such as rubber as in the fourth embodiment shown in FIG.

  In the first to fifth embodiments described above, the pressing means of the present invention is configured by the roller 10, but may be configured by the paper feed shaft 9. Hereinafter, Example 6 will be described.

  FIG. 10 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the sixth embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  As shown in FIG. 10, a bar-like member that extends in the direction of the central axis of the winding body is a supporting means for supporting the inner peripheral surface of the roll paper 8 and the roll paper core 7 that are the winding body of the paper 6. The rod-shaped member includes a protruding portion 9 a that contacts only a lower surface that is a part of the inner peripheral surface of the roll paper core 7.

  Further, the bar-shaped member constituting the paper feed shaft 9 has an outer peripheral surface whose outer diameter is smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a, and other than the portion where the protruding portion 9a is provided. This part has an outer peripheral surface spaced radially from the inner peripheral surface of the wound body. Here, the protruding portion 9a includes a plurality of protruding portions 9aa to 9ad arranged in parallel in the circumferential direction.

  According to the sixth embodiment, the following effects can be obtained. That is, the inner peripheral surface of the wound body is supported only by the protruding portion 9a of the paper feeding shaft 9, and the portions other than the protruding portion 9a of the paper feeding shaft 9 are restrained particularly in the circumferential direction with respect to the inner peripheral surface of the wound body. It can be set as the structure which does not give force.

  For this reason, the weight of the wound body, that is, the roll paper 8 and the roll paper core 7 acts as a pressing force on the contact surface between the protruding portion 9a and the inner peripheral surface of the wound body, and only the frictional force based on the pressing force is applied. Can act. In other words, in the sixth embodiment, the pressing means and the converting means are functional means that the protruding portion 9a of the paper feed shaft 9 takes charge.

  Also in the sixth embodiment, as in the first to fifth embodiments, a frictional force proportional to the weight of the wound body can be applied in a direction opposite to the rotation direction of the roll paper 8. It is possible to appropriately remove the slack of the paper 6 that accompanies the stoppage of the drawing of the paper 6, and to prevent a delay in the drawing due to the slack when the drawing is restarted.

  In addition, the form of the protrusion part 9 in the present Example 6 can be provided with various variations. Examples 7 to 11 will be described below.

  FIG. 11 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the seventh embodiment. As in FIG. 1, F indicates the exit side of the paper 6 of the receipt printer unit 1, U indicates the upper side, and R indicates the right side when viewed from the radial direction of the roll paper 8.

  As shown in FIG. 11, the paper feed shaft 9 is a rod-like member that extends in the direction of the central axis of the wound body, supporting means for supporting the inner surface of the roll paper 8 and the roll paper core 7 that are the wound body of the paper 6. And the protrusion part 9a which contacts only the lower surface which is a part of inner peripheral surface of the roll paper core 7 is included.

  In the seventh embodiment, the bar-shaped member constituting the paper feed shaft 9 is formed so as to have an outer peripheral surface whose outer diameter is smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a. The portions other than the portion where the portion 9a is provided are formed to have an outer peripheral surface that is radially separated from the inner peripheral surface of the wound body.

  The protruding portion 9a includes a plurality of protruding portions 9aa to 9ad arranged in the circumferential direction. Further, the protruding portions 9aa to 9ad include edge portions 9aae to 9ade on the drawing direction side where the paper 6 is pulled out from the wound body, that is, on the side opposite to the rotation direction θ of the roll paper 8.

  In the seventh embodiment, compared with the sixth embodiment, the ratio of the frictional force to the pressing force can be set larger based on the edge action of the edge portions 9aae to 9ade.

  FIG. 12 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the eighth embodiment. As in the sixth embodiment, the paper feed shaft 9 is a rod-shaped member that extends in the direction of the central axis of the wound body, and supports the roll paper 8 that is a wound body of the paper 6 and the inner peripheral surface of the roll paper core 7. And the protrusion part 9a which contacts only the lower surface which is a part of inner peripheral surface of the roll paper core 7 is included.

  In the eighth embodiment, the bar-shaped member constituting the paper feed shaft 9 is formed so as to have an outer peripheral surface whose outer diameter is smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a. The portions other than the portion where the portion 9a is provided are formed to have an outer peripheral surface that is radially separated from the inner peripheral surface of the wound body.

  The protrusions 9a include a plurality of protrusions 9aa to 9ad arranged in parallel in the circumferential direction in such a manner that grooves that are extremely shorter than the radial length of the protrusions 9a extending in the axial direction are alternately sandwiched. In the eighth embodiment, compared to the sixth embodiment, the rigidity of the entire protruding portion 9a can be increased.

  FIG. 13 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the ninth embodiment. As in the sixth embodiment, the paper feed shaft 9 is a rod-shaped member that extends in the direction of the central axis of the wound body, and supports the roll paper 8 that is a wound body of the paper 6 and the inner peripheral surface of the roll paper core 7. It also includes a protruding portion 9a that contacts only the lower surface, which is a part of the inner peripheral surface of the roll paper core 7.

  Further, in the ninth embodiment, the bar-like member constituting the paper feed shaft 9 is formed to have an outer peripheral surface having an outer diameter smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a. The portions other than the portion where the portion 9a is provided are formed to have an outer peripheral surface that is radially spaced from the inner peripheral surface of the wound body.

  Further, in the ninth embodiment, the protruding portion 9a includes a plurality of protruding portions 9ap arranged in the axial direction, and the protruding portion 9ap is inclined in the axial direction with respect to the other protruding portions 9ap adjacent in the axial direction. They are juxtaposed as close as possible through slit-shaped notches. The portion exposed on the radially outer side surface of the protruding portion 9ap of the notch constitutes an edge portion on the drawing direction side for pulling out the paper 6 from the roll paper 8. In the ninth embodiment, the rigidity of the entire protruding portion 9a can be increased, and the ratio of the frictional force to the pressing force can be increased by the edge portion.

  FIG. 14 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the tenth embodiment. As in the sixth embodiment, the paper feed shaft 9 is a rod-shaped member that extends in the direction of the central axis of the wound body, and supports the roll paper 8 that is a wound body of the paper 6 and the inner peripheral surface of the roll paper core 7. And the protrusion part 9a which contacts only the lower surface which is a part of inner peripheral surface of the roll paper core 7 is included.

  Also in the tenth embodiment, the bar-shaped member constituting the paper feed shaft 9 is formed to have an outer peripheral surface having an outer dimension smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a. Parts other than the part provided with 9a are formed so that it may have the outer peripheral surface spaced radially from the inner peripheral surface of the wound body.

  Furthermore, the radial direction outer side surface of the protrusion part 9a contains the processus | protrusion front-end | tip part 9az arranged in parallel in the axial direction and the circumferential direction. In the tenth embodiment, the rigidity of the entire protruding portion 9a can be increased, and the ratio of the frictional force to the pressing force can be increased by the biting effect on the inner peripheral surface of the roll paper core 7 of the protrusion tip portion 9az.

  FIG. 15 is a schematic diagram illustrating a main part of the receipt printer unit 1 according to the eleventh embodiment. As in the sixth embodiment, the paper feed shaft 9 is a rod-shaped member that extends in the direction of the central axis of the wound body, and supports the roll paper 8 that is a wound body of the paper 6 and the inner peripheral surface of the roll paper core 7. And the protrusion part 9a which contacts only the lower surface which is a part of inner peripheral surface of the roll paper core 7 is included as elastic members, such as rubber | gum, which are members different from a rod-shaped member.

  Also in the eleventh embodiment, the bar-shaped member constituting the paper feeding shaft 9 is formed to have an outer peripheral surface having an outer dimension smaller than the inner peripheral surface of the roll paper core 7 except for the protruding portion 9a, and the protruding portion 9a. The part other than the part provided with is formed so as to have an outer peripheral surface spaced radially from the inner peripheral surface of the wound body.

  The protruding portion 9a of the eleventh embodiment constitutes the protruding portions 9aa to 9ad divided in the circumferential direction as in the sixth embodiment, but the triangular length gradually decreases from the radially inner side to the outer side. It has a shape.

  In the tenth embodiment, in the state transition before the setting shown in the left side view in FIG. 15 and after the setting shown in the right side view, the protruding portions 9aa to 9ad constituting the protruding portion 9a are crushed by the weight of the wound body. Thus, there is an effect of increasing the contact area, and the effect of expanding the contact area can increase the ratio of the frictional force to the pressing force.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  The present invention relates to a printer, and can provide a paper feeding device, a printer, and a paper feeding method capable of smoothly performing each operation of drawing, feeding, and printing without causing an increase in cost. For example, the present invention is useful when applied to a printer that houses and uses a wound body around which a printing medium such as a receipt is wound.

1 Receipt printer unit (printer)
2 Printing unit 3 Paper feeding device 4 Printing head 5 Paper feed roller (conveying means)
6 Paper 7 Roll paper core 8 Roll paper (winding body)
8a Circular edge 9 Paper feed shaft (support means)
9a Protruding part (pressing means, converting means)
9aa to 9ad Projection part 9aae to 9ade Edge part 9ap Projection part 9az Projection tip part 10 Roll paper holding part 11 Roller (pressing means, conversion means)
11a Conical surface 11a Cylindrical surface 12 Rotating shaft 13 Spring (biasing means)
14 Spring (biasing means)
15 Arm 16 Tension roller (Tension adjusting means)
17 Oscillating shaft 18 Switching lever (separation means)
19 Hinge 20 Oscillating shaft

Claims (22)

  Support means for supporting the inner circumferential surface of the wound body in which the print medium is wound in a hollow shape so as to be slidably rotatable in the circumferential direction, and a portion other than the outer circumferential surface of the wound body with a radial component. A paper feeding device comprising a pressing means for pressing with a pressing force.   The sheet feeding device according to claim 1, wherein the portion is a part of a circular edge that forms a boundary between an outer peripheral surface of the wound body and an axial end surface.   The pressing means includes a cone that is rotatably supported around a rotation axis directed in the radial direction, and a biasing means that biases a conical surface of the cone with the pressing force. Item 3. The sheet feeding device according to Item 2.   The sheet feeding device according to claim 3, further comprising separation means for selectively separating the cylindrical body from the part.   The sheet feeding device according to claim 3, wherein the cone is an elastic member.   A cylindrical body that is supported by the pressing means so as to be rotatable around a rotation axis that is inclined with respect to the radial direction, and a biasing force that biases the outer peripheral surface of the cylindrical body to the part with the pressing force. The sheet feeding device according to claim 2, further comprising means.   The sheet feeding device according to claim 6, further comprising separation means for selectively separating the cylindrical body from the part.   The sheet feeding device according to claim 6, wherein the cylindrical body is an elastic member.   The sheet feeding device according to claim 1, wherein the portion is a part of an inner peripheral surface of the wound body.   The support means is a rod-shaped member extending in the central axis direction of the wound body, and the rod-shaped member includes a protrusion that contacts only a lower surface that is a part of the inner peripheral surface. The paper feeder described.   11. The sheet feeding device according to claim 10, wherein a portion of the rod-shaped member other than the portion where the protruding portion is provided has an outer peripheral surface spaced radially from an inner peripheral surface of the wound body.   The sheet feeding device according to claim 11, wherein the protruding portion includes a plurality of protruding portions arranged in parallel in the circumferential direction.   The sheet feeding device according to claim 12, wherein the protruding portion includes an edge portion on a drawing direction side for pulling out the print medium from the wound body.   The sheet feeding device according to claim 11, wherein the protrusion includes a plurality of protrusions arranged in parallel in the axial direction.   The sheet feeding device according to claim 14, wherein the protruding portion includes an edge portion on a drawing direction side for drawing out the printing medium from the wound body.   The sheet feeding device according to claim 11, wherein the protrusion includes a plurality of protrusion tip portions arranged in parallel in the axial direction and the circumferential direction.   The sheet feeding device according to claim 12, wherein the protrusion is an elastic member.   The conveyance means which conveys the said to-be-printed medium, The tension | tensile_strength adjustment means to adjust the tension | tensile_strength of the to-be-printed medium between the said conveyance means and the said winding body is included, The Claims 1-18 characterized by the above-mentioned. Paper feeder.   A printer including the paper feeding device according to claim 1.   A support step for supporting the inner peripheral surface of the wound body in which the printing medium is wound in a hollow shape so as to be slidable and rotatable in the circumferential direction, and a portion other than the outer peripheral surface of the wound body with a radial component A paper feeding method comprising a pressing step of pressing with a pressing force.   21. The paper feeding method according to claim 20, wherein the portion is a part of a circular edge that forms a boundary between an outer peripheral surface of the wound body and an axial end surface.   21. The paper feeding method according to claim 20, wherein the portion is a part of an inner peripheral surface of the wound body.

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