JP2006168974A - Roll paper holding shaft, roll paper holding device, printer and processing device equipped with the printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a roll paper holding shaft, a roll paper holding device, a printer and a processing device equipped with the printer, eliminating the necessity for providing a position regulating member in the roll paper holding shaft and easily performing roll paper fitting work by suppressing easy falling-off of either of the roll paper or the roll paper holding shaft in the state where the the roll paper and the roll paper holding shaft are loosely fitted into each other. <P>SOLUTION: The roll paper holding shaft is a shaft penetrating through and pivotally supporting the roll paper and is provided with a holding shaft body pivotally supporting the roll paper and with a pressing member loosely fitted into a grove of the holding shaft body, supported slidably in the diametrical direction of the shaft so as to prevent falling-off and energized in the outer peripheral face direction of the diametrical direction of the shaft. The end part of the pressing member is formed so as to project from the outer peripheral face of the holding shaft body. With the holding shaft body loosely fitted into the roll paper, the pressing member projecting from the holding shaft body is brought into press contact with inside of the roll paper. The roll paper holding device has the roll paper holding shaft, and the printer has the roll paper holding device. The processing device is equipped with the printer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roll paper holding shaft for holding roll paper used for printing, a roll paper holding device for holding roll paper via the roll paper holding shaft, and a printing apparatus including the roll paper holding device, The present invention also relates to a processing apparatus provided with the printing apparatus.

  Conventionally, processing devices such as POS (Point Of Sale) terminal devices, ATM (Automatic Teller Machine), and kiosk terminal devices are printing devices that print receipts, usage statements, and tickets issued by the processing devices inside the processing devices. I have. In the printing apparatus, roll paper in which printing paper is wound in a roll shape may be used.

  Further, in such a printing apparatus, a roll paper having a large weight may be used in order to hold a large amount of printing paper in the apparatus. The roll paper holding device that holds the roll paper is used to stably hold the heavy roll paper and to supply the paper smoothly from the heavy roll paper. Has been. The paper supplied from the roll of roll paper is required to pass through an accurate position with respect to the print head. However, when the roll paper is displaced in the axial direction, the paper is moved from an appropriate position with respect to the print head. Passes out of position. In order to suppress deviation from an appropriate position, the roll paper holding device is provided with a regulating member that regulates the positional deviation in the axial direction of the roll paper held by the roll paper holding device. For example, in the roll paper holding devices described in Patent Document 1 and Patent Document 2, the regulating member is mounted on a roll paper holding shaft that loosely fits into a hole in the shaft tube of the roll paper and pivotally supports the roll paper. The roll paper held on the holding shaft is provided so as to restrict relative movement in the axial direction with respect to the roll paper holding shaft. The regulating member is detachably provided on the roll paper holding shaft so that the roll paper can be attached to and detached from the roll paper holding shaft.

JP-A-10-236702 JP-A-11-79480

  However, in order to mount the roll paper on the roll paper holding shaft provided with the regulating member, the regulating member must be removed from the roll paper holding shaft, so the procedure for installing the roll paper becomes complicated and cumbersome, There has been a problem that the work time for mounting the roll paper becomes long. The above-described processing device such as the POS terminal device cannot operate until a new roll paper is loaded after using the loaded roll paper, and waits for an ATM user or the like during that time. Therefore, it has been a serious problem to increase the work time for mounting the roll paper.

  In order to avoid a complicated procedure for loading roll paper, it is conceivable to use a roll paper holding shaft having a configuration in which the regulating member is not provided on the roll paper holding shaft. However, for a roll paper holding shaft that is not provided with a regulating member, the force that restricts the relative movement in the axial direction between the roll paper holding shaft and the roll paper is maintained in the state where the roll paper is loosely fitted. When only the frictional force between the contact portion between the shaft and the roll paper is applied, and the axial force is applied, the relative movement in the axial direction between the roll paper and the roll paper holding shaft easily occurs. For example, when the roll paper holding shaft with the roll paper loosely fitted inclines from the horizontal direction, gravity acts in the axial direction and the roll paper or the roll paper holding shaft moves by its own weight. For this reason, when the roll paper holding shaft in which the roll paper is loosely fitted is loaded into the roll paper holding device, if the roll paper holding shaft is inclined from the horizontal direction, the roll paper or the roll paper holding shaft is likely to drop off, and the dropped roll There was a problem that the paper or roll paper holding shaft could be damaged. For example, when the operator grips and loads the outer diameter of the roll paper, the roll paper holding shaft that is loosely fitted to the roll paper is likely to fall out of the roll paper. If the roll paper or roll paper holding shaft falls off, not only the roll paper or roll paper holding shaft is damaged, but also the printing device or processing device is likely to be damaged by hitting the printing device or processing device. there were. In addition, the roll paper holding shaft that has fallen may enter the printing apparatus or the processing apparatus, and it may be difficult to remove the roll paper or the roll paper holding shaft. It was also a cause to make it difficult.

  Accordingly, an object of the present invention is to prevent any one of the roll paper and the roll paper holding shaft from easily slipping out of the loosely fitted state, thereby eliminating the need to provide a position regulating member on the roll paper holding shaft. In addition, the roll paper holding shaft and the roll paper holding device can simplify the roll paper mounting work and reduce the work time because it is not necessary to attach and detach the position regulating member during the roll paper mounting work. And a printing apparatus and a processing apparatus including the printing apparatus.

  A roll paper holding shaft according to the present invention has a shape that can be loosely fitted into a core hole of a roll paper, and is a roll paper holding shaft that loosely fits into the core hole and pivotally supports the roll paper, A pressing member is provided that presses the inner wall surface of the core hole with a force biased outward in the radial direction of the holding shaft while being loosely fitted in the core hole.

  The roll paper holding shaft according to the present invention is a roll paper holding shaft that penetrates the core hole of the roll paper and pivotally supports the roll paper, and has a shape that can be loosely fitted into the core hole, and is loosely fitted into the core hole. Then, the holding shaft body that pivotally supports the roll paper and the groove provided in the holding shaft body are loosely fitted and supported in a slidable and retaining state in the radial direction of the holding shaft body. A pressing member that is biased outward in the direction, part of the pressing member is formed to protrude from the outer peripheral surface of the holding shaft, and the holding shaft is loosely fitted in the core hole. In the state, the pressing member protruding from the holding shaft body is characterized in that the inner wall surface of the core hole is pressed by a force urging outward in the radial direction of the holding shaft body.

  According to the configuration of the roll paper holding shaft of the present invention, the pressing member presses the inner wall of the core hole by the force biased outward in the radial direction of the holding shaft body, so that the pressing member and the inner wall are pressed against each other. ing. The frictional force generated when the pressing member is pressed against the inner wall of the core hole is a resistance against the relative movement in the axial direction between the roll paper and the roll paper holding shaft fitted in the core hole of the roll paper. Accordingly, the roll paper holding shaft is loosely fitted in the core hole of the roll paper with a gap, and the force that regulates the relative movement in the axial direction between the roll paper holding shaft and the roll paper is Compared with a roll paper holding shaft that has only the frictional force between the contact portions with the roll paper, the possibility that the roll paper holding shaft falls out of the core hole by its own weight can be reduced. In addition, since the roll paper holding shaft is less likely to fall out of the core hole due to its own weight, it is not necessary to provide a roll paper retaining member on the roll paper holding shaft. The operation of removing the retaining member becomes unnecessary. As a result, compared to the case of using a roll paper holding shaft that requires a retaining member, the operation of mounting the roll paper on the roll paper holding shaft is facilitated, thereby reducing the work time.

  In this case, in the roll paper holding shaft, the force that urges the pressing member in the radially outer direction of the holding shaft body and presses the inner wall surface of the core hole to the pressing member causes the roll paper holding shaft to press against the core hole. It is preferable that the force required for insertion or removal is a force that is equal to or greater than the force necessary to support the weight of the roll paper holding shaft.

  According to this configuration, in order to extract the roll paper holding shaft penetrating the core hole from the core hole, a force larger than the force necessary to support the weight of the roll paper holding shaft is required. Is very unlikely to come out of the core hole only by the force of its own weight. Thereby, it can suppress that the roll paper holding shaft penetrated into the core hole falls off by its own weight.

  In this case, the holding shaft body of the roll paper holding shaft has a groove, and the first holding shaft is coaxial with the first holding shaft body in which the pressing member is loosely fitted, and the first holding shaft body. And a second holding shaft that is continuous with the body in the axial direction.

  According to this configuration, the holding shaft body is divided in the axial direction into the first holding shaft body and the second holding shaft body, and the respective lengths of the first holding shaft body and the second holding shaft body are divided. This is shorter than an integral holding shaft. By reducing the length of the member, the member can be easily processed.

  In this case, the first outer peripheral surface of the first holding shaft body is in contact with the inner surface of the core hole loosely fitted to the first holding shaft body to support the roll paper, and the first maximum diameter portion side Of the first holding shaft body is a first inclined portion that is a substantially frustoconical peripheral wall with the axial end face of the first holding shaft body as a top surface. 2 The second largest diameter portion that abuts the inner surface of the core hole loosely fitted to the holding shaft body and supports the roll paper, and the end surface on the second largest diameter portion side is the bottom surface, and the end surface in the axial direction of the second holding shaft body And a second inclined portion that is a substantially frustoconical peripheral wall having a top surface as a top surface. The outer diameter of the first maximum diameter portion and the outer diameter of the second maximum diameter portion are substantially the same, and the first maximum It is preferable that the diameter portion and the second maximum diameter portion cooperate to support the roll paper.

  According to this configuration, the roll paper is supported at two locations of the first maximum diameter portion and the second maximum diameter portion, and the outer diameter requires an accuracy corresponding to the inner diameter of the core hole of the roll paper. It is only the first maximum diameter portion and the second maximum diameter portion that the diameter is essential, and other portions of the outer peripheral surface do not require high accuracy. Since some parts that require high accuracy are part, it is easier to ensure the accuracy and manufacture of the members easier than the manufacture of members that require manufacturing the whole with high accuracy. Become. The first inclined portion and the second inclined portion are frustoconical peripheral walls and are inclined in the axial direction. Thereby, the outer peripheral part of a 1st holding shaft body and a 2nd holding shaft body can be formed by the shaping | molding which uses a simple type | mold whose extraction direction is only an axial direction.

  In this case, the groove portion has an outer opening provided on the first outer peripheral surface of the first holding shaft body, and a side opening provided on the end surface on the side in contact with the second holding shaft body and communicating with the outer opening. The side opening is formed so that the pressing member can be inserted into the groove portion from the side opening, and the outer opening has a part of the pressing member protruding outside the first outer peripheral surface of the holding shaft body from the outer opening. It is preferable to be formed.

  According to this configuration, since the pressing member can be inserted into the groove portion from the side surface opening, the pressing member can be incorporated into the first holding shaft body by inserting the pressing member into the groove portion from the side surface opening. it can. The side opening is provided on the end surface that is in contact with the second holding shaft body. When the first holding shaft body and the second holding shaft body are adjacent to each other, the side opening is covered with the second holding shaft body. Therefore, the pressing member can be prevented from being detached by the second holding shaft body without requiring a new retaining member. Since the side opening of the groove is provided on the end surface on the side in contact with the second holding shaft body, and the outer opening and the side opening are continuous, the removal of the groove including the outer opening is only in the axial direction. It can be formed by molding using a simple mold.

  In this case, the roll paper holding shaft further includes a holding center shaft formed with a rotating shaft portion that can be engaged with a bearing that rotatably holds the roll paper holding shaft holding the roll paper around the shaft. The shaft body is preferably fitted around the holding center axis so that the outer diameter of the holding shaft body is substantially coaxial with the holding center axis.

  According to this configuration, the holding center shaft supported by the bearing supports the roll paper holding shaft that supports the roll paper. Thus, the strength required for supporting the roll paper can be realized by giving the holding central shaft sufficient strength to support the roll paper. The holding shaft body is formed as a member different from the holding center shaft. This makes it possible to form the holding shaft body and the holding center axis from different materials, forming the holding shaft body from a material that is easy to form a shape such as a groove, and setting the holding center axis to the holding shaft body. It can be formed of a material that is different from the material to be formed and has excellent strength and hardness.

  In this case, the holding shaft body externally fitted to the holding center shaft is disposed between the pair of locking members fixed to the holding center shaft, and is rotatably fitted to the holding center shaft and is also connected to the pair of engagement members. It is preferable that the axial movement of the holding center axis with respect to the holding center axis is restricted by the stop member.

  According to this configuration, since the position of the holding shaft body in the axial direction with respect to the holding center shaft is determined to be a fixed position, the roll paper supported by the holding shaft body, that is, the bearing on which the holding center shaft is supported, that is, the roll The position with respect to the paper holding device can be made constant. Since the holding shaft that supports the roll paper is rotatably fitted around the holding center shaft, the roll paper supported by the holding shaft can easily turn smoothly. Can be small.

  In this case, it is preferable that the holding shaft body fitted around the holding center shaft is fixed to the holding center shaft.

  According to this configuration, since the position of the holding shaft body in the axial direction with respect to the holding center axis is fixed at a fixed position, the bearing of the roll paper supported by the holding shaft body, on which the holding center axis is supported, That is, the position with respect to the roll paper holding device can be made constant.

  In this case, a flange capable of regulating the position of one side in the axial direction of the roll paper pivotally supported by the first holding shaft body is provided at the end of the first holding shaft body on the side in contact with the locking member. The strength of the flange with respect to the axial force that the flange receives from the roll paper is integrally formed with the shaft body, and the strength of the locking member with respect to the axial force that the locking member receives from the first holding shaft body, or It is preferably smaller than either the fixing strength of the locking member to the holding center axis or the fixing strength of the holding shaft body to the holding center axis.

  According to this configuration, when an excessive axial force acts between the roll paper supported by the roll paper holding shaft and the holding center shaft, the strength of the flange is increased in the axial direction with respect to the holding center axis of the holding shaft body. The flange is destroyed because it is smaller than the strength of the position restriction. Thereby, it is possible to prevent the axial position restriction of the holding shaft body with respect to the holding center axis from being broken. A roll paper holding shaft whose axial position restriction with respect to the holding central axis of the holding shaft body is broken cannot be used. However, even if the flange is broken, the frictional force caused by the pressing member being pressed against the inner wall of the core hole is affected by the relative movement in the axial direction between the roll paper and the holding shaft body fitted into the core hole of the roll paper. It becomes a drag force and it is possible to suppress the positional deviation of the roll paper in the axial direction with respect to the roll paper holding shaft, and the roll paper holding shaft cannot be used at all.

  In this case, the first holding shaft body includes a first center tube portion that engages with the holding center shaft, and a plurality of first protrusion portions that protrude radially from the first center tube portion and extend in the axial direction. At least one first protrusion of the plurality of protrusions has a polygonal column shape that is loosely fitted into the core hole and pivotally supports the roll paper by the top surfaces of the plurality of first protrusions. It is preferable that a groove is formed.

  According to this configuration, the space between the plurality of first protrusions is a space. Since the space portion exists in the columnar shape that supports the roll paper, the space does not exist, and the material for forming the first holding shaft body is also present in the space portion as compared to the first holding shaft body. Thus, the weight of the first holding shaft body can be reduced.

  In this case, the second holding shaft body includes a second central cylindrical portion that engages with the central holding shaft, a plurality of second protruding portions that project radially from the central cylindrical portion and extend in the axial direction, and a first holding portion. A plate-like coupling plate that joins between the plurality of second projecting portions at the end in contact with the shaft body, and is loosely fitted into the core hole by the top surface of the plurality of second projecting portions to roll It is preferable to form a polygonal column shape that supports paper, and the coupling plate is formed closer to the second central tube than the plane connecting the tops of the second protrusions.

  According to this configuration, there is a space between the plurality of second protrusions. The presence of the space portion in the columnar shape that supports the roll paper, the space does not exist, and the second holding shaft body in which the material for forming the second holding shaft body is also present in the space portion. Thus, the weight of the second holding shaft body can be reduced. In addition, since the coupling plate is formed closer to the central cylinder portion than the plane connecting the tops of the second protrusions, the core hole is connected to the coupling plate when the roll paper holding shaft is inserted into the core hole of the roll paper. By eliminating the contact with the roll paper, the roll paper holding shaft can be more easily penetrated into the core hole of the roll paper.

  In this case, the first holding shaft body includes a first shaft body portion in which the core hole is loosely fitted, and a first rotating shaft formed at one end of the first shaft body portion so as to be coaxial with the first shaft body portion. And a first coupling part formed at the other end of the first shaft body part, and a first groove part formed with an outer diameter side of the first shaft body part and a first coupling part and opening at the end surface. The second holding shaft body has a second shaft body portion in which the core hole is loosely fitted, and a second rotating shaft portion formed at one end of the second shaft body portion so as to be coaxial with the second shaft body portion. And the first holding shaft body and the second shaft body part so that the first shaft body part and the second shaft body part are coaxial with each other by being coupled to the first coupling part. And a second coupling portion that couples the holding shaft body, and the pressing member is loosely fitted in a groove portion provided in the first shaft body section and is slidable in the radial direction of the first shaft body section. In addition, the diameter of the first shaft body is Which is preferably biased in the outward direction.

  According to this configuration, the holding center axis is unnecessary, and the parts constituting the roll paper holding axis can be reduced.

  A roll paper holding device according to the present invention includes the roll paper holding shaft according to any one of the above-mentioned claims.

  According to the configuration of the present invention, it is not necessary to provide a position regulating member on the roll paper holding shaft by preventing one of the roll paper and the roll paper holding shaft from easily slipping out from the loosely fitted state. Since the roll paper mounting operation does not require removal of the position regulating member, the roll paper mounting operation is facilitated, and the roll paper holding shaft can be shortened. It is possible to reduce the working time of the roll paper mounting operation, and it is possible to realize a roll paper holding device that can suppress the possibility of damage by the roll paper or the roll paper holding shaft that has fallen out.

  The roll paper holding device according to the present invention is disposed so as to be able to support a roll paper holding shaft that passes through a core hole in the center of the roll paper and pivotally supports the roll paper, and a rotary shaft that protrudes from both ends of the roll paper holding shaft. A pair of support frame portions that have a bearing groove portion that holds the roll paper and rotatably holds the roll paper holding shaft around the shaft, and press the side surface of the roll paper held by the roll paper holding shaft. A roll paper holding device comprising: a pressing unit that positions the roll paper at a reference position, wherein the roll paper holding shaft is the roll paper holding shaft according to any one of the preceding claims. And

  According to the configuration of the present invention, the roll paper can be loaded by a simple operation of attaching the roll paper to the roll paper holding shaft and putting it into the rotation groove portion of the support frame portion. Even if there is some play in the roll paper holding device, the roll paper is pressed to the reference position by the contact member and aligned so that the roll paper is free to move in the axial direction. It can always be aligned to the reference position, and when the diameter of the roll paper is large, there is a possibility that extra rotation occurs due to inertial force immediately after the drawer stops, but such extra rotation is pressed. The roll paper holding device can be realized which can be braked by the pressing force of the part and can suppress the occurrence of sagging of the printing paper. Furthermore, it is not necessary to provide a position restricting member on the roll paper holding shaft by preventing one of the roll paper and the roll paper holding shaft from easily slipping out from the loosely fitted state. Since it is not necessary to remove the position regulating member during the mounting operation, the roll paper mounting operation is facilitated and the work time can be shortened. An operation time can be shortened, and the roll paper holding device which can suppress the possibility of damage by the fallen roll paper or the roll paper holding shaft can be realized.

  A printing apparatus according to the present invention includes the roll paper holding device according to claim 14.

  According to the configuration of the present invention, it is not necessary to provide a position regulating member on the roll paper holding shaft by preventing one of the roll paper and the roll paper holding shaft from easily slipping out from the loosely fitted state. Since the roll paper mounting operation does not require removal of the position regulating member, the roll paper mounting operation is facilitated, and the roll paper holding shaft can be shortened. The roll paper loading operation time can be shortened, and the roll paper holding device that can suppress the possibility of being damaged by the fallen roll paper or roll paper holding shaft is provided. The printing apparatus which can suppress the possibility of being damaged by the roll paper or roll paper holding shaft that has fallen out can be realized.

  A printing apparatus according to the present invention includes the roll paper holding device according to claim 15.

  According to this configuration, the roll paper can be loaded by a simple operation of attaching the roll paper to the roll paper holding shaft and inserting the roll paper into the rotation groove portion of the support frame portion. Even if there is some play in the roll paper holding device, the roll paper is pressed and aligned to the reference position by the contact member, so that the roll paper is restricted from freely moving in the axial direction, and always When the roll paper has a large diameter, it can rotate due to inertial force immediately after the drawing stops, and slack may occur due to inertial force. A roll paper holding device that can be braked by a pressing force and can suppress the occurrence of sagging of printing paper, and is easy from the state in which the roll paper and the roll paper holding shaft are loosely fitted. By suppressing either one from falling off, it is not necessary to provide a position restricting member on the roll paper holding shaft, and it is not necessary to remove the position restricting member when mounting the roll paper. The roll paper holding shaft can be shortened and the work time can be shortened, so the work time of the roll paper mounting work can be shortened, and the roll paper or roll paper holding shaft that has fallen out can be shortened. By providing a roll paper holding device that can suppress the possibility of damage, it is possible to reduce the work time of the roll paper mounting work, and suppress the possibility of damage by the roll paper or roll paper holding shaft that has fallen off In addition, the roll paper can be loaded by a simple operation, and the roll paper can be always aligned at the reference position. It is possible to realize a printing apparatus which can suppress Mino generation.

  A processing apparatus according to the present invention includes the printing apparatus according to claim 16.

  According to the configuration of the present invention, it is possible to reduce the work time of the roll paper mounting operation, and the roll paper includes the printing device that can suppress the possibility of being damaged by the roll paper or the roll paper holding shaft that has fallen out. It is possible to reduce the work time of the mounting operation, and it is possible to realize a processing apparatus that can suppress the possibility of damage by the roll paper or the roll paper holding shaft that has fallen out.

  A processing apparatus according to the present invention includes the printing apparatus according to claim 17.

  According to the configuration of the present invention, it is possible to reduce the work time of the roll paper mounting operation, it is possible to suppress the possibility of damage by the roll paper or the roll paper holding shaft that has fallen out, and the roll paper can be easily operated. The roll paper can be loaded, the roll paper can always be aligned according to the reference position, and the printing paper can be prevented from sagging. It can be shortened, and the roll paper that has fallen out or the roll paper holding shaft can suppress the possibility of damage, and it is possible to load the roll paper with a simple operation. The roll paper is always aligned to the reference position. Therefore, it is possible to realize a processing apparatus that can suppress the occurrence of sagging of printing paper.

  A roll paper holding shaft, a roll paper holding device, and a printing device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of the printing apparatus.

  As shown in FIG. 1, the printing apparatus 10 stores a roll paper 60 inside the printing apparatus. The printing paper 61 is pulled out from the roll paper 60 and set in the printing unit 50, and is placed under a print head (not shown). Is printed, and the printed printing paper 61 is discharged from the paper output port 51. The print paper 61 can be taken out by being cut by a cutter device (not shown) arranged in the vicinity of the paper output port 51. In the roll paper 60, both ends of a holding shaft 30 (see FIG. 3) penetrating the roll paper 60 are erected on the base frame 11, and support frame portions 12a and 12b constituting the roll paper holding device 20 (FIG. 2). In this case, the printing paper 61 is pulled out from the roll paper 60 and is held in a storage position suitable for supplying to the printing unit 50. The roll paper 60 is formed by winding a printing paper 61 around a core tube 64 in a roll shape (see FIG. 4B). The holding shaft 30 corresponds to a roll paper holding shaft.

  FIG. 2 is a perspective view showing a roll paper holding device portion, and FIG. 3 is an external perspective view of the holding shaft. FIG. 2 is a partial perspective view of the printing apparatus when viewed from the direction of arrow A in FIG. 1, and the roll paper holding device 20 with the holding shaft 30 (see FIG. 3) not loaded with the roll paper 60 attached. Is shown.

  As shown in FIG. 3, the holding shaft 30 includes a holding center shaft 31, a first holding shaft body 32, a second holding shaft body 33, and a pressing member 34. The holding center shaft 31 is formed with rotating shaft portions 31a and 31b at both ends, and an engaging shaft portion 31c is formed at the tip of the rotating shaft portion 31b. The first holding shaft body 32 and the second holding shaft body 33 are loosely fitted with the center hole 65 (see FIG. 4B) of the roll paper 60 when the roll paper 60 is loaded on the holding shaft 30. The roll paper 60 is supported. The first holding shaft body 32 and the second holding shaft body 33 are loosely fitted to the holding center shaft 31 and are rotatably supported around the axis. Details of the shape of the holding shaft 30, the holding center shaft 31, the first holding shaft body 32, the second holding shaft body 33, and the pressing member 34 will be described later. The first holding shaft body 32 and the second holding shaft body 33 correspond to the holding shaft body, and the center hole 65 corresponds to the core hole.

  As shown in FIG. 2, the support frame portions 12a and 12b are supported by bearing grooves 16a and 16b that support the rotating shaft portions 31a and 31b (see FIG. 3) of the holding shaft 30 and the support frame portions 12a and 12b. Guide wall plates 17a and 17b for regulating the axial position of the holding shaft 30 are provided. The guide wall plate 17b is formed with an engaging groove 18 for preventing the holding shaft 30 from being loaded in the reverse direction in the roll paper holding device 20. Both ends of the holding shaft 30 are rotatably spanned on the support frame portions 12a and 12b. The rotating shaft portions 31a and 31b are loaded in bearing grooves 16a and 16b provided in the support frame portions 12a and 12b, respectively. At this time, the engagement shaft portion 31c of the holding shaft 30 is loaded so as to enter the engagement groove 18 which is a notch-shaped alignment groove provided in the guide wall plate 17b of the support frame portion 12b. Therefore, even if it tries to load this in the reverse direction, since the engaging shaft part 31c hits the guide wall board 17a, it cannot load. This prevents the holding shaft 30 from being set in reverse.

  Next, each structure of the holding shaft 30 will be described. 4A is a cross-sectional view of the holding shaft, and FIG. 4B is a cross-sectional view of the state in which the holding shaft is inserted into the core tube of the roll paper. 5A is an external perspective view of the pressing member, FIG. 5B is an external perspective view of the first holding shaft body, and FIG. 5C is an external perspective view of the second holding shaft body. FIG.

  First, the holding center shaft 31 will be described. As shown in FIG. 4A, the holding center shaft 31 is formed with rotating shaft portions 31a and 31b at both ends, and an engaging shaft portion 31c is formed at the tip of the rotating shaft portion 31b. Further, the holding center shaft 31 is formed with E-shaped grooves 31d and 31e for fitting the E-shaped retaining rings, and the two E-shaped retaining rings 36 are formed at the portions of the E-shaped grooves 31d and 31e. The holding center shaft 31 can be fitted. The E-type retaining ring 36 corresponds to a locking member.

  Next, the shape of the pressing member 34 will be described. 4A and 5A, the pressing member 34 includes a pressing member body 37, two first engaging protrusions 38 protruding from the pressing member body 37, and a second engaging protrusion. 39. The pressing member body 37 has a box shape in which one surface in the longitudinal direction of a substantially rectangular parallelepiped shape is open, and the top surface 37a on the opposite side of the opening has a shape in which one end in the longitudinal direction is cut obliquely. A slope 41 is formed. A rod-shaped spring protrusion 42 for positioning the spring 46 and a cylindrical spring guide 43 surrounding the spring protrusion 42 are provided upright on the bottom surface of the box-shaped dent side. The spring protrusion 42 and the spring guide 43 are each formed at three locations. First engaging protrusions 38 are provided upright on the two surfaces in the longitudinal direction that are continuous with the open surface, on the open surface side that is the end on the side where the inclined surface 41 is formed. A second engagement protrusion 39 is provided upright on the open side of the end surface on the short side opposite to the side on which the inclined surface 41 of the pressing member 37 is formed. At the tip of the second engagement protrusion 39, an engagement protrusion convex portion 39a is formed on the side opposite to the opened surface.

  Next, the shape of the first holding shaft body 32 will be described. As shown in FIG. 5B, the first holding shaft body 32 includes a first center tube portion 49 that is loosely fitted to the holding center shaft 31, and a flange that is formed in a bowl shape on the end surface of the first center tube portion 49. The plate 52 includes a first projecting plate 53 and a projecting body 54 that project radially from the first center tube portion 49 and extend in the axial direction of the first center tube portion 49. The first center tube portion 49 has a cylindrical shape in which a first center shaft hole 56 for loosely fitting the holding center shaft 31 is formed at the center. The flange plate 52 is formed in a hook shape on the end surface of the first center tube portion 49, and four flanges 52 a further projecting from the tops of the first projecting plate 53 and the projecting body 54 are formed at the projecting tip. Is formed.

  The protruding body 54 is formed at two positions symmetrically with respect to the first central cylinder portion 49. The two projecting body plates 57 forming the projecting body 54 project from the first center tube portion 49 in parallel with each other across a plane passing through the axial center of the first center tube portion 49, and thus the first center tube portion 49. It extends in the axial direction. A space between the two protruding body plates 57 is the groove 66. One end of the first central cylindrical portion 49 of the protruding body plate 57 in the axial direction is connected to the flange plate 52 integrally. The flange plate 52 side of the groove portion 66 is covered with a top plate portion 58 that joins the top portions of the two protruding body plates 57. In a portion of the top of the protrusion plate 57 that is not joined by the top plate portion 58, a top plate collar 57b having the same thickness as the top plate portion 58 is formed on the groove 66 side of the top of each protrusion plate 57. Yes. A space surrounded by the top plate portion 58 and the two top plate ridges 57b is referred to as a groove upper opening 66a. The side opposite to the flange plate 52 in the axial direction of the first center tube portion 49 of the groove portion 66 is an open end, which is referred to as a groove end opening 66b.

  A top plate projection 58 a is formed on the top plate portion 58 on the groove 66 side. A flange opening 66c is formed in the flange plate 52 facing the groove portion 66, and the groove portion 66 communicates with a space outside the flange plate 52 through the flange opening 66c (see FIG. 4A). An engagement recess 59 is formed at one end of the first central tube portion 49 of the protruding body plate 57 on the opposite side to the flange plate 52 in the axial direction. The engagement recess 59 has a shape in which the end of the projecting body plate 57 is cut out on the radially outer side of the first center tube portion 49, leaving an engagement rod 57 a, and is open to the end surface side of the first center tube portion 49. is doing. The height in the direction substantially perpendicular to the top surface 37 a of the pressing member body 37 is greater than the distance between the surface of the first center tube portion 49 facing the groove portion 66 and the surface of the top plate portion 58 facing the groove portion 66. Therefore, the pressing member 34 does not sink under the top plate portion 58.

  The first protruding plate 53 is formed at four positions in symmetrical positions and shapes with the two protruding bodies 54 interposed therebetween. The first projecting plate 53 is erected radially from the first center tube portion 49, extends in the axial direction of the first center tube portion 49, and one end is integrally connected to the flange plate 52. The top surfaces of the two projecting bodies 54 and the four first projecting plates 53 form a polygonal column shape that is loosely fitted into the center hole 65 of the core tube 64. The first protruding plate 53 and the protruding body 54 correspond to the first protruding portion.

  Next, the shape of the second holding shaft body 33 will be described. As shown in FIG. 5C, the second holding shaft body 33 includes a second center tube portion 68 that is loosely fitted to the holding center shaft 31, and projects radially from the second center tube portion 68. A second projecting plate 69 extending in the axial direction of the portion 68 and a coupling plate 71 formed on the end face of the second central cylinder portion 68 in a bowl shape and coupling the second projecting plate 69 to each other. The second center tube portion 68 has a cylindrical shape in which a second center shaft hole 72 for loosely fitting the holding center shaft 31 is formed at the center. The coupling plate 71 is formed in a bowl shape on the end surface of the second central cylinder portion 68, and the shape of the second central cylinder portion 68 viewed from the axial direction has the top surface of the second projecting plate 69 as a substantially apex. It has a substantially octagonal shape.

  The second projecting plate 69 is formed at eight positions at symmetrical positions and shapes with respect to the axis of the second central cylinder portion 68. The eight second projecting plates 69 are provided in a radial manner on the second central cylindrical portion 68, extend in the axial direction of the second central cylindrical portion 68, and are center holes of the core tube 64 at the eight top surfaces. A substantially octagonal prism shape loosely fitted to 65 is formed. One end of the second projecting plate 69 extending in the axial direction of the second central cylinder portion 68 is integrally connected to the coupling plate 71, and the other end is an inclined surface 73 so that the tip side of the substantially octagonal prism shape is narrowed. Is formed. The second protruding plate 69 corresponds to the second protruding portion.

  Next, the configuration of the holding shaft 30 in which the holding center shaft 31, the first holding shaft body 32, the second holding shaft body 33, and the pressing member 34 are assembled will be described. As shown in FIG. 4A, the first holding shaft body 32 and the second holding shaft body 33 have a first center shaft hole 56 and a second center shaft hole 72 fitted to the holding center shaft 31, respectively. The support center shaft 31 is supported so as to be rotatable about the axis. The first holding shaft body 32 and the second holding shaft body 33 are in contact with the end surface on the groove end opening 66 b side of the first holding shaft body 32 and the coupling plate 71 of the second holding shaft body 33.

  As described above, the holding center shaft 31 is formed with the E-shaped grooves 31d and 31e for fitting the E-shaped retaining ring 36, and the two E-shaped retaining rings 36 have the E-shaped grooves 31d and 31d, The holding center shaft 31 is fitted at the portion 31e. The first holding shaft body 32 and the second holding shaft body 33 loosely fitted to the holding center shaft 31 are located between the two E-type retaining rings 36 fixed to the holding center shaft 31, and the holding center The shaft 31, the first holding shaft body 32, and the second holding shaft body 33 are regulated in the axial relative position and the axial relative movement by the two E-type retaining rings 36. .

  The pressing member 34 is arranged so that the opened surface faces the center side of the first holding shaft body 32 and the end on the side where the inclined surface 41 is formed is the groove end opening 66b side (second holding shaft body 33 side). 1 is fitted in a groove 66 formed in the holding shaft body 32. The first engagement projection 38 is located at the position of the engagement recess 59, and the second engagement projection 39 is located at a portion covered with the top plate portion 58 of the groove 66. A spring 46 that is a compression coil spring is disposed in a space formed by the spring protrusion 42 and the spring guide 43, and urges the pressing member 34 outward in the radial direction of the first holding shaft body 32. When the pressing member 34 is urged outward in the radial direction of the first holding shaft body 32, the first engagement protrusion 38 abuts on the engagement rod 57 a, and the second engagement protrusion 39 is brought into contact with the top plate portion 58. The pressing member 34 is in contact with the first holding shaft body 32.

  In this state, the end of the pressing member 34 on the top surface 37 a side of the pressing member body 37 protrudes outward in the radial direction of the first holding shaft body 32 from the tip of the protruding body plate 57. The engaging protrusion convex portion 39a of the pressing member 34 is positioned closer to the flange plate 52 than the top plate protrusion 58a of the first holding shaft body 32, and the movement of the pressing member 34 toward the groove end opening 66b is The protrusion 39a and the top plate protrusion 58a are not easily engaged with each other.

  When the holding shaft 30 is fitted into the roll paper 60, as shown in FIG. 4B, the end surface of the core tube 64 comes into contact with the flange 52a, and the center hole 65 of the core tube 64 is the first holding shaft body. 32 and the second holding shaft 33 are fitted with a slight gap. The top surface 37 a of the pressing member 34 is brought into pressure contact with the inner wall 65 a of the center hole 65 by the force that the pressing member 34 is biased by the spring 46. The force with which the spring 46 biases the pressing member 34 is required to move the holding shaft 30 in the axial direction with respect to the roll paper 60 in a state where the pressing member 34 is pressed against the inner wall 65a of the center hole 65. The force is preferably greater than the force required to support the weight of the holding shaft 30. For example, the force required to move the holding shaft 30 in the axial direction relative to the roll paper 60 is set to be twice the force necessary to support the weight of the holding shaft 30.

  Further, the strength of the flange 52a in the axial direction of the holding shaft 30 is such that when an excessive axial force is applied from the roll paper 60 to the flange 52a in a state where the roll paper 60 is set on the holding shaft 30, The strength is set such that the flange 52a is broken before the ring 36 is damaged or the engagement of the E-type retaining ring 36 with the holding center shaft 31 is released. In other words, the flange 52a is broken by an excessive axial force applied from the roll paper 60, so that the E-type retaining ring 36 is damaged or detached from the holding center shaft 31. The strength is set to suppress. When the holding shaft 30 on which the roll paper 60 is set is loaded into the printing apparatus 10, the state shown in FIG.

  Next, a configuration for positioning the roll paper 60 in the roll paper holding device 20 will be described. FIG. 6 is a perspective view showing a roll paper holding device portion, and FIG. 7 is an external perspective view of the printing device as viewed from obliquely above near a plan view. 6 is a partial perspective view of the printing apparatus showing the roll paper holding device as viewed from the opposite side of FIG. 2 (in the direction of arrow B in FIG. 2), and shows a state in which neither the roll paper 60 nor the holding shaft 30 is mounted. Show. 8 is a rear view of the roll paper holding device as viewed from the direction of arrow C in FIG. 6, and FIG. 9 is a rear view of the roll paper holding device in a state in which the roll paper is set. FIG. 9 shows the position of the contact member 15 when the roll paper 60 having a large diameter is set, and a part of the holding shaft 30 and the roll paper 60 is indicated by a broken line.

  As shown in FIG. 6, a contact member 15 is provided inside the support frame portion 12b. The contact member 15 is provided in a hollow portion 14 provided in the pressing table 13, and is pressed inward (in the direction of the roll paper 60) by elastic members 19a and 19b such as compression springs provided therein. ing. The contact member 15 and the elastic members 19 a and 19 b provided in the hollow portion 14 function as a pressing portion for the roll paper 60. Therefore, the roll paper 60 is always pressed and urged toward the flange 52a (reference position) of the holding shaft 30 by the pressing portion.

  Although not shown, the contact member 15 is provided with a locking member that engages with the inside of the recess 14 so as not to jump out of the recess 14, and is loaded with the roll paper 60. Even when it is not, it is configured not to jump out of the position shown in FIG. Moreover, the press stand part 13 can be comprised so that it can move inside as shown in FIG. Thereby, in the case of roll paper with a narrow paper width, it becomes possible to move the pressing table 13 in accordance with the paper width.

  As shown in FIGS. 6 and 8, the protruding amount in the lateral direction of the upper half of the contact member 15 is substantially the same, but the lower half protrudes inward from the upper side, and the protruding amount is downward. It grows according to. Therefore, when the diameter of the roll paper 60 is large, as shown in FIG. 9, the maximum protrusion 15 a of the contact member abuts on the side surface of the roll paper 60. Therefore, the elastic members 19a and 19b are in the most compressed state, and press the roll paper 60 to the reference position (the direction of the flange 52a) with the strongest pressing force.

  By sequentially pulling out the printing paper 61 from the roll paper 60 and using it for printing, the roll paper 60 is consumed and its diameter is reduced. Then, the contact position between the side surface of the roll paper 60 and the contact member 15 moves, and when the diameter of the roll paper 60 becomes smaller than the diameter indicated by the two-dot chain line in FIG. 15b abuts. When the diameter of the roll paper 60 is further reduced, the contact position between the side surface of the roll paper 60 and the contact member 15 moves down the inclined surface of the inclined portion 15b and moves to the contact position 15c.

  By such movement of the contact position between the roll paper 60 and the contact member 15, the contact member 15 is gradually pushed out in the lateral direction by the pressing force of the elastic members 19a and a9b. Thereby, the elastic force of the elastic members 19a and 19b is released little by little, and the pressing force of the contact member 15 is gradually weakened. When the diameter of the roll paper 60 becomes less than half, the side surface of the roll paper comes into contact with the linear portion of the contact position 15 c of the contact member 15. Thereby, thereafter, the contact member 15 presses the roll paper 60 in the reference position direction with a relatively weak and almost uniform force.

  As described above, according to the configuration of the present invention, the misalignment of the roll paper 60 can be suppressed, but the misalignment of the roll paper 60 and the misalignment of the printing position that occur when the misalignment cannot be suppressed. The relationship will be described. As described above, the reason why the roll paper 60 is pressed in the reference position direction is to eliminate the positional deviation of the roll paper 60 due to the difference between the width of the roll paper 60 and the width of the roll paper storage unit. The roll paper width has a dimensional error that cannot be eliminated in production. Considering the dimensional error, the size of the storage section is set so that even the roll paper 60 whose width is larger by the dimensional error can be loaded. A margin is provided for the dimensions of the roll paper 60. The roll paper 60 attached to the storage unit can move in the axial direction by a margin, and the roll paper 60 may be displaced. When the position of the roll paper 60 is shifted, the position of the print paper 61 supplied from the roll paper 60 to the print head is shifted with respect to the print head, and the print position is shifted.

  FIG. 10 is a schematic diagram for explaining the relationship between the position of the roll paper and the printing position. The position of the print head of the printing unit 50 is at a mechanically determined position, and if the position of the print paper 61 drawn from the roll paper 60 is shifted, the position of the head and the position of the print paper 61 are shifted, and printing is performed. Misalignment occurs.

  Such a shift in printing position is particularly problematic when printing on preprinted printing paper. For example, ruled lines are printed in advance on printing paper, and predetermined information must be printed in the ruled line frame, or predetermined characters are printed in advance, and individual transactions are accurately performed at predetermined positions. This is a problem when the contents (for example, issuing a concert ticket) have to be printed.

  FIG. 10 shows a case where the ruled lines 62 are printed in advance. In FIG. 10, the case where the roll paper is shifted from the reference position (roll paper 60 ′) is indicated by a broken line. An arrow D indicates the conveyance direction of the printing paper. When the position of the roll paper 60 ′ is shifted, the transport position of the printing paper 61 ′ drawn therefrom is also shifted. As a result, as shown in FIG. 10, the print data 63 ′ is printed in a state of protruding beyond the border of the ruled line 62 ′. Therefore, by always pressing the roll paper 60 and aligning the roll paper 60 with the reference position, the deviation of the printing position due to such play is prevented, and the print data 63 is accurately printed in the ruled line 62. can do.

  As described above, the roll paper 60 is pressed in the reference position direction with a relatively strong force when the diameter of the roll paper is large, and is pressed with a relatively weak force when the diameter is small. This is because if the roll paper has a large diameter, a large force is required to press the roll paper to the reference position, but if the roll paper has a small diameter, it can be aligned even with a weak force. Further, when the roll paper has a large diameter, the inertial force in the rotation direction is also large. Therefore, it is desirable to provide a brake for braking the inertial force to stop the roll paper. The contact member 15 can also serve as a brake, and can apply a large braking force when the roll paper has a large diameter and a large inertial force.

  Since the inertial force in the rotating direction decreases as the diameter of the roll paper decreases, it is almost unnecessary. Even when the diameter is reduced, if the brake is applied with the same pressing force as in the case of the large diameter, useless driving energy is consumed to pull out the printing paper. In addition, the brake can prevent the roll paper from being excessively pulled out by inertia and causing slack when the roll paper is stopped. This sagging has a small load when it is sagging during conveyance, but when the sagging is eliminated, the paper is stretched and the load suddenly increases, so normal conveyance cannot be performed due to extreme fluctuations in the load. Cause a defect.

  In this embodiment, when the diameter of the roll paper is almost halved, the pressing force for the brake is almost unnecessary. From the viewpoint that the diameter becomes less than half, the roll paper is aligned with the reference position. It is set as the structure which provides the weak constant pressing force required in order to make it. However, the side surface shape may be changed from the maximum diameter to the minimum diameter at a constant inclination angle from a maximum diameter to a minimum diameter so as to change at a constant ratio from the maximum diameter to the minimum diameter.

  Further, as described above, it is desirable that the pressing force of the contact member 15 be reduced when the diameter of the roll paper is reduced. However, when the diameter of the roll paper is not so large, or there is a margin in the conveyance driving force of the printing paper. In some cases, the roll paper 60 may be pressed with a uniform pressing force from the maximum diameter to the minimum diameter.

  As shown in FIG. 8, the contact member 15 constituting the pressing portion has an end portion formed in a curved shape. In this configuration, the roll paper 60 set on the holding shaft 30 can be easily set on the support frame. The roll paper holding device of the present invention makes it possible to hold the roll paper at the reference position while allowing the roll paper 60 to be loaded into the printing apparatus in a state almost similar to throwing.

  The curved shape of the contact member 15 is such that when the roll paper is loaded, the contact member 15 can be smoothly retracted by the edge of the roll paper 60. That is, according to the contact member 15 shown in FIG. 8, even when the roll paper is loaded from above, the edge of the roll paper slides along the oblique inclined surface and the force pushing the contact member 15 downward is The contact member 15 is moved in the direction of pressing the elastic members 19a and 19b by the component force according to the inclined surface, and at the same time, the roll paper is pressed and moved in the reference position direction of the flange 52a on the holding shaft 30, The reference position can be aligned.

  Next, a holding shaft 80 that is a second holding shaft different from the above-described holding shaft 30 will be described. FIG. 11A is a cross-sectional view showing a state in which the second holding shaft is inserted into the core tube of the roll paper. The holding shaft 80 corresponds to a roll paper holding shaft.

  As shown in FIG. 11A, the holding shaft 80 includes a holding center shaft 31, a 21st holding shaft body 82, a 22nd holding shaft body 83, and a pressing member 34. The holding center shaft 31 and the pressing member 34 are the holding center shaft 31 and the pressing member 34 provided on the holding shaft 30 described above. The spring 46 is also a spring 46 provided on the holding shaft 30. The 21st holding shaft body 82 and the 22nd holding shaft body 83 are loosely fitted with the center hole 65 (see FIG. 4B) of the roll paper 60 when the roll paper 60 is loaded on the holding shaft 80. The roll paper 60 is supported. The twenty-first holding shaft body 82 and the twenty-second holding shaft body 83 are loosely fitted to the holding center shaft 31 and are rotatably supported around the axis. The 21st holding shaft body 82 and the 22nd holding shaft body 83 loosely fitted to the holding center shaft 31 are located between the two E-type retaining rings 36 fixed to the holding center shaft 31, and the holding center The shaft 31, the twenty-first holding shaft body 82, and the twenty-second holding shaft body 83 are regulated by the two E-type retaining rings 36 in the axial direction and the relative movement in the axial direction. . The 21st holding shaft body 82 and the 22nd holding shaft body 83 correspond to the holding shaft body.

  Next, the shape of the 21st holding shaft body 82 will be described. In the 21st holding shaft body 82, the portion of the first holding shaft body 32 that is formed by the first central tube portion 49, the protruding body 54, the first protruding plate 53, and the flange plate 52 is centered on the holding central shaft. It has a cylindrical shape in which a hole for loosely fitting 31 is formed. The four flanges 52a formed in the twenty-first holding shaft body 82, the groove portion 66 and the peripheral structure of the groove portion 66 are the four flanges 52a formed in the first holding shaft body 32, the groove portion 66, and the groove portion 66. This is basically the same as the configuration around. The outer peripheral surface of the shaft different from the first holding shaft body 32 will be described.

  The first outer peripheral surface 84 of the twenty-first holding shaft body 82 is an outer peripheral surface formed at the end of the twenty-first holding shaft body 82 on the flange 52a side, and the center hole 65 loosely fitted to the twenty-first holding shaft body 82 is formed. The first largest diameter portion 84a that contacts the inner wall 65a and supports the roll paper 60, and a substantially truncated cone having the first largest diameter portion 84a side as a bottom surface and the end face in the axial direction of the 21st holding shaft body 82 as a top surface. It is comprised with the 1st inclination part 84b which is a surrounding wall of a shape. The inclination of the first inclined portion 84b with respect to the axis of the twenty-first holding shaft body 82 is useful as a drawing taper when the twenty-first holding shaft body 82 is formed by mold forming with the axial direction as the drawing direction. The inclination of the first inclined portion 84b with respect to the axis of the twenty-first holding shaft body 82 is set to, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a punch taper in mold forming.

  Next, the shape of the 22nd holding shaft 83 will be described. In the 22nd holding shaft body 83, the portion formed by the second central cylindrical portion 68, the second projecting plate 69, and the coupling plate 71 in the second holding shaft body 33 is loosely fitted to the holding central shaft 31 at the center. It has a cylindrical shape with a hole to be formed. The second outer peripheral surface 86, which is a cylindrical outer peripheral surface, has a second maximum diameter portion 86a, a rear second inclined portion 86b, a first second inclined portion 86c, and a tip inclined portion 86d. The second maximum diameter portion 86 a supports the roll paper 60 by abutting against the inner wall 65 a of the center hole 65 loosely fitted to the twenty-second holding shaft body 83. The rear second inclined portion 86b is a substantially frustoconical peripheral wall with the second maximum diameter portion 86a side as a bottom surface and one end surface in the axial direction of the 22nd holding shaft body 83 as a top surface. The second inclined portion 86c is formed on the opposite side to the second rearward inclined portion 86b with respect to the second largest diameter portion 86a, and the second largest diameter portion 86a side is the bottom surface, and the axial direction of the twenty-second holding shaft 83 It is a substantially frustoconical peripheral wall with the end face side of the top face as the top face. The tip inclined portion 86d is a substantially frustoconical peripheral wall having the second inclined portion 86c side as a bottom surface and one end surface in the axial direction of the 22nd holding shaft body 83 as a top surface. The rear second inclined portion 86b, the tip second inclined portion 86c, and the tip inclined portion 86d correspond to the second inclined portion.

  Since the tip inclined portion 86d is inclined with respect to the axis of the twenty-second holding shaft body 83, the operation of inserting the holding shaft 80 into the center hole 65 becomes easier. The fact that the rear second inclined portion 86b, the first second inclined portion 86c, and the tip inclined portion 86d are inclined with respect to the axis of the twenty-second holding shaft body 83 means that the twenty-second holding shaft body 83 is set with the axial direction as the drawing direction. This is useful as a taper taper when forming the film by molding. The inclination of the second rear inclined portion 86b and the second second inclined portion 86c with respect to the axis of the twenty-second holding shaft body 83 is set to, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a drawing taper in mold forming. To do. The inclination of the tip inclined portion 86d is set to 0.248 rd, for example, so that the operation of inserting the holding shaft 80 into the center hole 65 is facilitated.

  When the holding shaft 80 is inserted into the roll paper 60, the end surface of the core tube 64 comes into contact with the flange 52a, and the holding shaft 80 is loosely fitted in the center hole 65 of the roll paper 60. And the second largest diameter portion 86a abut against the inner wall 65a, so that the holding shaft 80 supports the roll paper 60. The axial dimensions of the twenty-first holding shaft body 82 and the twenty-second holding shaft body 83 are such that the first maximum diameter portion 84a and the second maximum diameter portion 86a are the core tube 64 even if the roll paper has the narrowest width. The dimensions are such that they can abut against the inner wall 65a. The top surface 37 a of the pressing member 34 is brought into pressure contact with the inner wall 65 a of the center hole 65 by the force that the pressing member 34 is biased by the spring 46. The force with which the spring 46 biases the pressing member 34 is required to move the holding shaft 80 in the axial direction with respect to the roll paper 60 in a state where the pressing member 34 is pressed against the inner wall 65 a of the center hole 65. It is preferable that the force is larger than the force necessary to support the weight of the holding shaft 80. For example, the force required to move the holding shaft 80 in the axial direction relative to the roll paper 60 is set to be twice the force necessary to support the weight of the holding shaft 80. The twenty-first holding shaft body 82 corresponds to a first holding shaft body, and the twenty-second holding shaft body 83 corresponds to a second holding shaft body.

  Next, a holding shaft 90 that is a third holding shaft different from the holding shaft 30 and the holding shaft 80 described above will be described. FIG. 11B is a cross-sectional view showing a state in which the third holding shaft is inserted into the core tube of the roll paper. A roll paper 160 shown in FIG. 11B is a roll paper having a width narrower than that of the roll paper 60, and a printing paper 161 having a width narrower than the printing paper 61 is rolled into a core tube 164 shorter than the core tube 64. It is formed by wrapping. The holding shaft 90 corresponds to a roll paper holding shaft.

  As shown in FIG. 11B, the holding shaft 90 includes a holding center shaft 31, a 31st holding shaft body 92, a 32nd holding shaft body 93, and a pressing member 34. The holding center shaft 31 and the pressing member 34 are the holding center shaft 31 and the pressing member 34 provided on the holding shaft 30 described above. The spring 46 is also a spring 46 provided on the holding shaft 30. The 31st holding shaft body 92 and the 32nd holding shaft body 93 support the roll paper 160 by loosely fitting with the center hole 165 of the roll paper 160 when the roll paper 160 is loaded on the holding shaft 90. is there. The thirty-first holding shaft body 92 and the thirty-second holding shaft body 93 are loosely fitted to the holding center shaft 31 and are rotatably supported around the axis. The 31st holding shaft body 92 and the 32nd holding shaft body 93 loosely fitted to the holding center shaft 31 are located between the two E-type retaining rings 36 fixed to the holding center shaft 31, and the holding center The shaft 31, the 31st holding shaft body 92, and the 32nd holding shaft body 93 are regulated by the two E-type retaining rings 36 in the axial direction and the relative movement in the axial direction. . The 31st holding shaft body 92 and the 32nd holding shaft body 93 correspond to the holding shaft body.

  Next, the shape of the 31st holding shaft body 92 will be described. Similar to the first holding shaft body 32, the thirty-first holding shaft body 92 includes a first center tube portion 49 that is loosely fitted to the holding center shaft 31, and a flange that is formed in a bowl shape on the end surface of the first center tube portion 49. The plate 52 includes a first projecting plate 95 and a projecting body 94 that project radially from the first center tube portion 49 and extend in the axial direction of the first center tube portion 49. The configuration of the first center tube portion 49, the flange plate 52, and the four flanges 52a projecting from the tip of the flange plate 52 are the same as the first center tube portion 49, the flange plate 52, and the flange of the first holding shaft body 32. The configuration is basically the same as that of 52a.

  Similar to the projecting body 54 of the first holding shaft body 32, the projecting body 94 is formed at two positions in a symmetrical position and shape across the first center tube portion 49. Extends in the direction. The configuration of the groove portion 66 and the periphery of the groove portion 66 formed in the protrusion 94 is basically the same as the configuration of the groove portion 66 and the periphery of the groove portion 66 formed in the first holding shaft body 32. Similar to the first protruding plate 53 of the first holding shaft body 32, the first protruding plate 95 is formed at four positions in a symmetrical position and shape with the two protruding bodies 94 interposed therebetween. Radially erected on the portion 49, extends in the axial direction of the first central tube portion 49, and one end is integrally connected to the flange plate 52.

  Different from the first holding shaft body 32, it is formed by the top surfaces of the two protruding bodies 94 and the four first protruding plates 95, and is a polygonal column shape that is loosely fitted in the center hole 165 of the core tube 164. explain. The top surface of the projecting body 94 erected on the first central cylinder portion 49 is formed by a projecting body highest portion 94a and a projecting body slope portion 94b. The protrusion highest portion 94 a is formed at the end of the protrusion 94 on the flange 52 a side, and is substantially parallel to the axial direction of the first central tube portion 49. The protruding body inclined surface portion 94 b is continuous with the protruding body highest portion 94 a and is inclined so that the end side opposite to the flange 52 a approaches the first center tube portion 49.

  The top surface of the first protruding plate 95 erected on the first central cylinder portion 49 is formed by a protruding plate highest portion 95a and a protruding plate slope portion 95b. The protruding plate highest portion 95 a is formed at the end of the first protruding plate 95 on the flange 52 a side, and is substantially parallel to the axial direction of the first central tube portion 49. The protruding plate inclined surface portion 95 b is connected to the protruding plate highest portion 95 a and is inclined so that the end side opposite to the flange 52 a approaches the first center tube portion 49. The two protruding body highest portions 94a and the four protruding plate highest portions 95a form a polygonal column shape that is loosely fitted into the center hole 165 of the core tube 164. The first protruding plate 95 and the protruding body 94 correspond to the first protruding portion. The outer surface of the polygonal column shape formed by the protruding body highest portion 94a and the protruding plate highest portion 95a corresponds to the first largest diameter portion, and the outer surface of the polygonal frustum shape formed by the protruding body slope portion 94b, and the protruding plate slope The polygonal frustum-shaped outer surface formed by the portion 95b corresponds to the first inclined portion.

  The fact that the projecting body inclined surface portion 94b and the projecting plate inclined surface portion 95b are inclined with respect to the axis of the 31st holding shaft body 92 means that the 31st holding shaft body 92 is formed by molding using the axial direction as the drawing direction. This is useful as a taper taper. The inclinations of the protruding body inclined surface portion 94b and the protruding plate inclined surface portion 95b with respect to the axis of the 31st holding shaft body 92 are set to, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a punching taper in mold forming.

  Next, the shape of the 32nd holding shaft body 93 will be described. Similarly to the second holding shaft body 33, the thirty-second holding shaft body 93 projects freely from the second center tube portion 68, which is loosely fitted to the holding center shaft 31, and radially protrudes from the second center tube portion 68. A second projecting plate 69 extending in the axial direction of the portion 68, and a coupling plate 98 formed in a bowl shape on the end surface of the second central cylinder portion 68 and coupling the second projecting plate 69 to each other. The configuration of the second center tube portion 68 is basically the same as the configuration of the second center tube portion 68 of the second holding shaft body 33. The coupling plate 98 is formed in a bowl shape on the end surface of the second central cylindrical portion 68, and the shape of the second central cylindrical portion 68 viewed from the axial direction has the top surface of the second projecting plate 96 as a substantially apex. It has a substantially octagonal shape.

  Similarly to the second holding shaft body 33, the second protruding plate 96 is formed at eight positions and shapes symmetrical with respect to the axis of the second central cylindrical portion 68, and stands on the second central cylindrical portion 68 radially. It is provided and extends in the axial direction of the second central cylinder portion 68. The top surface of the second projecting plate 96 is formed by a projecting plate highest portion 96a, a projecting plate rear slope portion 96b, a projecting plate tip slope portion 96c, and a slope 96d. The projecting plate rear slope portion 96 b is formed at the end of the second projecting plate 96 on the coupling plate 98 side, and is inclined so that the end side on the coupling plate 98 side approaches the second central cylinder portion 68. The protruding plate highest portion 96 a is continuous with the protruding plate rear slope portion 96 b and is substantially parallel to the axial direction of the second central cylindrical portion 68. The protruding plate tip inclined surface portion 96 c is continuous with the protruding plate highest portion 96 a and is inclined so that the end side opposite to the coupling plate 98 approaches the second central cylindrical portion 68. The inclined surface 96d is connected to the protruding plate tip inclined surface portion 96c, and is inclined at an acute angle with respect to the protruding plate tip inclined surface portion 96c so that the end side opposite to the coupling plate 98 approaches the second central cylindrical portion 68. The eight protruding plate highest portions 96a form a substantially octagonal prism shape loosely fitted in the center hole 165 of the core tube 164.

  The second protruding plate 96 corresponds to the second protruding portion. The substantially octagonal prism-shaped outer surface formed by the projecting body highest portion 96a corresponds to the second largest diameter portion, and is formed by a polygonal frustum-shaped outer surface formed by the projecting plate rear slope portion 96b and the projecting plate tip slope portion 96c. The polygonal frustum-shaped outer surface and the polygonal frustum-shaped outer surface formed by the inclined surface 96d correspond to the second inclined portion.

  Since the inclined surface 96d is inclined with respect to the axis of the thirty-second holding shaft body 93, the operation of inserting the holding shaft 90 into the center hole 165 becomes easier. The fact that the protruding plate rear slope portion 96b, the protruding plate tip slope portion 96c, and the slope 96d are inclined with respect to the axis of the thirty-second holding shaft body 93 is that the thirty-second holding shaft body 93 is shaped with the axial direction as the drawing direction. It is useful as a taper taper when formed by molding. The inclination of the protruding plate rear slope portion 96b and the protruding plate tip slope portion 96c with respect to the axis of the thirty-second holding shaft body 93 is set to, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a draft taper in mold forming. To do. The inclination of the inclined surface 96d is set to, for example, 0.248 rd so that the operation of inserting the holding shaft 90 into the center hole 165 is facilitated.

  When the holding shaft 90 is inserted into the roll paper 160, the end surface of the core tube 164 comes into contact with the flange 52 a and the holding shaft 90 is loosely fitted in the center hole 165 of the roll paper 160. The protruding shaft highest portion 95a and the protruding plate highest portion 96a abut against the inner wall 165a, whereby the holding shaft 90 supports the roll paper 160. The axial dimensions of the thirty-first holding shaft 92 and the thirty-second holding shaft 93 are such that the highest protruding portion 94a or the highest protruding plate portion 95a and the highest protruding plate portion 96a, even if the roll paper has the smallest width. However, the dimensions are such that the inner wall 165a of the core tube 164 can be abutted. The top surface 37 a of the pressing member 34 is pressed against the inner wall 165 a of the center hole 165 by the force of the pressing member 34 biased by the spring 46. The force with which the spring 46 biases the pressing member 34 is required to move the holding shaft 90 in the axial direction with respect to the roll paper 160 in a state where the pressing member 34 is pressed against the inner wall 165a of the center hole 165. It is preferable that the force is larger than the force necessary to support the weight of the holding shaft 90. For example, the force required to move the holding shaft 90 in the axial direction relative to the roll paper 60 is set to be twice the force required to support the weight of the holding shaft 90. The thirty-first holding shaft body 92 corresponds to a first holding shaft body, and the thirty-second holding shaft body 93 corresponds to a second holding shaft body.

  Next, the holding shaft 100 which is a fourth holding shaft different from the holding shaft 30, the holding shaft 80, and the holding shaft 90 will be described. FIG. 12 is a cross-sectional view of the fourth holding shaft. The holding shaft 100 corresponds to a roll paper holding shaft.

  As shown in FIG. 12, the holding shaft 100 includes a forty-first holding shaft body 102, a forty-second holding shaft body 103, and a pressing member 34. The pressing member 34 is the pressing member 34 provided on the holding shaft 30 described above. The spring 46 is also a spring 46 provided on the holding shaft 30. The 41st holding shaft body 102 and the 42nd holding shaft body 103 support the roll paper 60 by loosely fitting with the center hole 65 of the roll paper 60 when the roll paper 60 is loaded on the holding shaft 100. is there. The 41st holding shaft body 102 and the 42nd holding shaft body 103 correspond to the holding shaft body.

  Next, the shape of the 41st holding shaft body 102 will be described. The 41st holding shaft body 102 has substantially the same configuration as the first holding shaft body 32, and the configuration of the first central shaft portion 104 of the 41st holding shaft body 102 is the same as that of the first holding shaft body 32. This is different from the configuration of the first center tube portion 49. The first central shaft portion 104 is formed with a rotating shaft portion 104b on the end surface on the side where the flange 52a (see FIG. 5B) is formed, and the groove end opening 66b (see FIG. 5B). The first coupling portion 104a is formed on the end surface on the side where the reference) is formed. The rotating shaft portion 104b and the first coupling portion 104a are formed on the top surfaces of the projecting body 54 and the first projecting plate 53, and are coaxial with the polygonal column shape that is loosely fitted in the center hole 65 of the core tube 64. It is formed as follows. The projecting body 54, the first projecting plate 53, the flange plate 52, and the 41st holding shaft body 102 at the portion where the projecting body 54, the first projecting plate 53, and the flange plate 52 are erected are the first shaft body. It corresponds to the part.

  The rotation shaft portion 104b is formed for the same purpose as the rotation shaft portion 31a formed on the holding center shaft 31 of the holding shaft 30. The rotary shaft 104b is engaged with and supported by the bearing groove 16a provided in the support frame portion 12a of the roll paper holding device 20, whereby the holding shaft 100 is loaded into the roll paper holding device 20 (FIG. 2). reference). The first coupling portion 104a couples the 41st holding shaft body 102 and the 42nd holding shaft body 103 integrally by coupling with a second coupling portion 106a described later.

  Next, the shape of the forty-second holding shaft 103 will be described. The forty-second holding shaft body 103 has substantially the same configuration as the second holding shaft body 33, and the configuration of the second central shaft portion 106 of the forty-second holding shaft body 103 is the same as that of the second holding shaft body 33. This is different from the configuration of the second central cylinder portion 68. The second central shaft portion 106 has a second coupling portion 106a formed on the end surface on the side where the coupling plate 71 (see FIG. 5C) is formed, and the slope 73 (FIG. The rotating shaft portion 106b and the engaging shaft portion 106c are formed on the end surface on the side where c) is formed. The second coupling portion 106a, the rotating shaft portion 106b, and the engaging shaft portion 106c are formed on the top surface of the second protruding plate 69 described above, and are coaxial with the polygonal column shape that fits loosely into the center hole 65 of the core tube 64. It is formed to become. The second protruding plate 69, the coupling plate 71, and the second central shaft portion 106 where the second protruding plate 69 and the coupling plate 71 are erected correspond to the second shaft body portion.

  The rotation shaft portion 106 b is formed for the same purpose as the rotation shaft portion 31 b formed on the holding center shaft 31 of the holding shaft 30, and the engagement shaft portion 106 c is an engagement formed on the holding center shaft 31. It is formed for the same purpose as the coaxial portion 31c. The rotating shaft 106 b is engaged with and supported by the bearing groove 16 b provided in the support frame 12 b of the roll paper holding device 20, so that the holding shaft 100 is loaded into the roll paper holding device 20. In a state where the rotating shaft portion 106b is engaged with the bearing groove 16b, the engaging shaft portion 106c erected at the tip of the rotating shaft portion 106b has a notch shape provided on the guide wall plate 17b of the support frame portion 12b. The engaging groove 18 is an alignment groove. When the holding shaft 100 is to be loaded in the opposite direction, the engagement shaft portion 106c abuts against the guide wall plate 17a, thereby preventing the holding shaft 100 from being loaded. This prevents the holding shaft 100 from being set reversely on the roll paper holding device 20 (see FIG. 2).

  The second coupling portion 106a couples the 41st holding shaft body 102 and the 42nd holding shaft body 103 integrally by coupling with the first coupling portion 104a. As a method for fixing the second coupling portion 106a and the first coupling portion 104a, for example, a method of adhering, a method of welding one, a method of driving in an interference fit, a method of screwing and forming a screw, etc. Can be adopted.

  When the holding shaft 100 is fitted into the roll paper 60, the end surface of the core tube 64 comes into contact with the flange 52 a, and the center hole 65 of the core tube 64 is slightly between the 41st holding shaft body 102 and the 42nd holding shaft body 103. It fits with a small gap (see FIG. 4B). The top surface 37 a of the pressing member 34 is brought into pressure contact with the inner wall 65 a of the center hole 65 by the force that the pressing member 34 is biased by the spring 46. The force with which the spring 46 biases the pressing member 34 is required to move the holding shaft 100 in the axial direction with respect to the roll paper 60 in a state where the pressing member 34 is pressed against the inner wall 65 a of the center hole 65. It is preferable that the force is greater than the force required to support the weight of the holding shaft 100. For example, the force required to move the holding shaft 100 in the axial direction relative to the roll paper 60 is set to be twice the force necessary to support the weight of the holding shaft 100. When the holding shaft 100 on which the roll paper 60 is set is loaded into the printing apparatus 10, the state shown in FIG. The 41st holding shaft body 102 corresponds to a first holding shaft body, and the 42nd holding shaft body 103 corresponds to a second holding shaft body.

  The printing device 10 is installed in a processing device such as a POS terminal device, ATM, or kiosk terminal device, and is used as a printing device that prints a receipt, a usage statement, a ticket, or the like issued by the processing device inside the processing device. Can do.

According to this embodiment, the following effects can be obtained.
(1) When the holding shaft 30 is fitted into the roll paper 60, the end surface of the core tube 64 comes into contact with the flange 52 a, and the center hole 65 of the core tube 64 has the first holding shaft body 32 and the second holding shaft body 33. And fit with a slight gap. The top surface 37 a of the pressing member 34 is brought into pressure contact with the inner wall 65 a of the center hole 65 by the force that the pressing member 34 is biased by the spring 46. The frictional force generated by the pressing member 34 being pressed against the inner wall 65 a becomes a resistance against relative movement in the axial direction between the roll paper 60 and the holding shaft 30 fitted in the center hole 65 of the roll paper 60. As a result, the roll paper holding shaft is loosely fitted in the core hole of the roll paper with a gap, and the force that regulates the relative movement of the roll paper holding shaft and the roll paper in the axial direction is the same as that of the roll paper holding shaft. Compared with a roll paper holding shaft that has only a frictional force with the roll paper, the possibility that the holding shaft 30 falls out of the core hole by its own weight can be reduced. Further, since the holding shaft 30 is less likely to fall out of the core hole due to its own weight, it is not necessary to provide the holding shaft 30 with a retaining member for the roll paper 60. The operation of removing the retaining member becomes unnecessary. This makes it easier to mount the roll paper 60 on the holding shaft 30 than when using a roll paper holding shaft that requires a retaining member. The same effect can be obtained for the holding shafts 80, 90, 100.

  (2) The top surface 37 a of the pressing member 34 is brought into pressure contact with the inner wall 65 a of the center hole 65 by the force with which the pressing member 34 is urged by the spring 46. The force with which the spring 46 biases the pressing member 34 is the force required to move the holding shaft 30 in the axial direction with respect to the roll paper 60 in a state where the pressing member 34 is pressed against the inner wall 65 a of the center hole 65. The force is set to be twice the force required to support the weight of the holding shaft 30. From this, it is possible to prevent the holding shaft 30 penetrating into the center hole 65 from falling off due to its own weight. Further, when the holding shaft 30 is inserted or removed from the center hole 65, the work can be performed without requiring a large force that makes the work difficult. The same effect can be obtained for the holding shafts 80, 90, 100.

  (3) The holding shaft 30 is loosely fitted into the center hole 65 of the roll paper 60 when the roll paper 60 is loaded on the holding shaft 30, and the first holding shaft body 32 that supports the roll paper 60 and the second holding shaft. And a shaft body 33. The length of each member is shortened by making the first holding shaft body 32 and the second holding shaft body 33 into two bodies with respect to the length of the holding shaft 30 necessary to support the roll paper 60. be able to. By reducing the length of the member, the member can be easily processed. In particular, the center hole can be easily processed.

  (4) When the holding shaft 80 is inserted into the roll paper 60, the end surface of the core tube 64 comes into contact with the flange 52a, and the holding shaft 80 is loosely fitted in the center hole 65 of the roll paper 60. The holding shaft 80 supports the roll paper 60 when the diameter portion 84a and the second maximum diameter portion 86a come into contact with the inner wall 65a. The roll paper is supported at two locations of the first maximum diameter portion 84a and the second maximum diameter portion 86a, and it is essential that the outer diameter is an outer diameter that requires accuracy corresponding to the inner diameter of the center hole 65. Only the first maximum diameter portion 84a and the second maximum diameter portion 86a are used, and the other portions of the outer peripheral surface do not require high accuracy. Since some parts that require high accuracy are part, it is easier to ensure the accuracy and manufacture of the members easier than the manufacture of members that require manufacturing the whole with high accuracy. Become. The same effect can be obtained for the holding shaft 90.

  (5) The inclination of the first inclined portion 84b with respect to the axis of the 21st holding shaft body 82 is set to, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a punch taper in mold forming. The inclination of the rear second inclined portion 86b and the second second inclined portion 86c with respect to the axis of the twenty-second holding shaft body 83 is, for example, 0.0174 rd (radian) in consideration of an appropriate inclination as a drawing taper in mold forming. Is set to As a result, the outer peripheral portions of the twenty-first holding shaft body 82 and the twenty-second holding shaft body 83 can be formed by molding using a simple mold in which the drawing direction is only the axial direction.

  (6) The first holding shaft body 32 and the second holding shaft body 33 are in contact with the end surface of the first holding shaft body 32 on the groove end opening 66b side and the coupling plate 71 of the second holding shaft body 33. . Since the groove end opening 66 b is covered with the coupling plate 71, the pressing member 34 can be prevented from coming off without the need to provide a retaining member for the pressing member 34 loosely fitted in the groove 66.

  (7) The groove end opening 66b of the groove portion 66 is an open end opened on the end surface in the axial direction. With this configuration, a mold for forming the shape of the groove portion 66 can be extracted in the axial direction of the first holding shaft body through the groove end opening 66b. As a result, the groove 66 can be formed by molding using a simple mold in which the drawing direction is only the axial direction.

  (8) A flange opening 66c is formed in the flange plate 52 facing the groove portion 66, and the groove portion 66 communicates with a space outside the flange plate 52 through the flange opening 66c. A top plate projection 58a is formed on the groove portion 66 side of the top plate portion 58, and a portion sandwiched between the top plate projection 58a and the flange plate 52 of the groove portion 66 cannot be processed from the groove end opening 66b side. It can be processed from the flange plate 52 side through the opening 66c. A mold for forming the shape of the portion sandwiched between the top plate projection 58a and the flange plate 52 of the groove portion 66 can be pulled out in the axial direction of the first holding shaft body through the flange opening 66c. As a result, the portion sandwiched between the top plate projection 58a and the flange plate 52 of the groove 66 can be formed by molding using a simple mold whose extraction direction is only the axial direction.

  (9) The holding shafts 30, 80, 90 include a holding center shaft 31 having rotating shaft portions 31 a, 31 b formed at both ends. The strength required for the holding shafts 30, 80, 90 to support the roll paper 60, 160 can be realized by giving the holding center shaft 31 sufficient strength. The holding shaft bodies such as the first holding shaft body 32 and the second holding shaft body 33 can be made of a material that easily forms the shape of the groove portion 66 and the like, giving priority to workability over strength.

  (10) The axial strength of the holding shaft 30 of the flange 52a is such that when an excessive axial force is applied from the roll paper 60 to the flange 52a while the roll paper 60 is set on the holding shaft 30, the E type The strength is set such that the flange 52a is broken before the retaining ring 36 is damaged or the engagement of the E-shaped retaining ring 36 with the holding center shaft 31 is released. As a result, the flange 52a is broken by an excessive axial force applied from the roll paper 60 to the holding shaft 30, so that the E-type retaining ring 36 is damaged or the E-type retaining ring 36 is held centrally. Dropping from 31 can be suppressed. The flange 52a formed on the holding shaft 80 and the holding shaft 90 has the same configuration and has the same effect.

  (11) The holding shaft 100 includes a first central shaft portion 104 in which a rotation shaft portion 104b and a first coupling portion 104a are formed, a second coupling portion 106a, a rotation shaft portion 106b, and an engagement shaft portion 106c. And a second central shaft portion 106 formed. The second coupling portion 106a couples the 41st holding shaft body 102 and the 42nd holding shaft body 103 together by coupling with the first coupling portion 104a. Therefore, the holding shaft 100 can be made unnecessary to include the holding center shaft 31 as a constituent member.

  (12) The pressing member 34 is loosely fitted in the groove portion 66 so that the end on the side where the inclined surface 41 is formed is on the groove end opening 66b side (second holding shaft body 33 side). When the holding shaft 30 is inserted into the center hole 65, the pressing member 34 hits the core tube 64 at the inclined surface 41, and the pressing member 34 is pressed into the back side of the groove portion 60. Thus, when the holding shaft 30 is inserted into the roll paper 60, the core tube 64 hits the pressing member 34, thereby preventing the work from being hindered and facilitating the work.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention, and can be implemented as follows.

  (Modification 1) In the above-described embodiment, the force with which the spring 46 biases the pressing member 34 is the holding shaft with respect to the roll paper 60 in a state where the pressing member 34 is pressed against the inner wall 65 a of the center hole 65. The force required to move 30 in the axial direction is set to be twice the force required to support the weight of the holding shaft 30. However, the force by which the spring 46 urges the pressing member 34 is not limited to a setting that is doubled, and the force with which the pressing member 34 is pressed against the inner wall 65 a of the center hole 65 is held against the roll paper 60. It is preferable that the force required to move the shaft 30 in the axial direction is set to be equal to or greater than the force required to support the weight of the holding shaft 30.

  If the force required to remove the holding shaft 30 with respect to the center hole 65 is equal to or greater than the force required to support the weight of the holding shaft 30, the holding shaft 30 that has penetrated the center hole 65 is under its own weight. It can be suppressed from falling off. Further, it is desirable that the force required to insert or remove the holding shaft 30 with respect to the center hole 65 is not more than 5 times the force necessary to support the weight of the holding shaft 30. If the force is about 5 times or less, when inserting or removing the holding shaft 30 into or from the center hole 65, the operation can be performed without requiring a large force that makes the operation difficult.

  (Modification 2) In the above-described embodiment, the spring 46 is a coil spring, but the spring is not limited to a coil spring. A leaf spring or the like may be used. Alternatively, the protrusion may be formed integrally with the pressing member, and the pressing member may be biased with a force that elastically deforms the protrusion. The protrusion may be formed integrally with the holding shaft, and the pressing member may be urged by a force that elastically deforms the protrusion, or the protrusion may directly contact the inner wall of the center hole of the roll paper. .

  (Modification 3) In the above-described embodiment, the first holding shaft body 32 and the second holding shaft body 33 are fitted around the holding center shaft 31 and supported by the holding center shaft 31 so as to be rotatable about the axis. ing. However, it is not essential that the holding shaft body is supported by the holding center axis so as to be rotatable about the axis. The holding shaft body may be fixed to the holding center axis. Since the holding shaft body is fixed to the holding center shaft, a regulating member that regulates the positional deviation in the axial direction between the holding shaft body and the holding center shaft becomes unnecessary. In addition, since the configuration for fixing the regulating member to the holding center shaft is unnecessary, the processing of the holding center shaft is facilitated. Since the position of the holding shaft body in the axial direction with respect to the holding center axis is fixed at a fixed position, the roll paper supported by the holding shaft body with respect to the bearing on which the holding center axis is supported, that is, the roll paper holding device. The position can be made constant. As a method of fixing the holding shaft body and the holding center shaft, for example, a method of bonding, a method of welding the holding shaft body, a method of driving with an interference fit, or the like can be employed.

  (Modification 4) In the above-described embodiment, the holding center shaft 31, the first holding shaft body, and the second holding shaft body are defined in the axial direction by the two E-type retaining rings 36. At the same time, relative movement in the axial direction is restricted. It is not essential to use the E-type retaining ring as a regulating member that regulates relative movement between the holding center shaft, the first holding shaft body, and the second holding shaft body. A C-type retaining ring or the like may be used, or a dedicated regulating member may be provided.

  (Modification 5) In the holding shaft 100 of the above-described embodiment, the 41st holding shaft body 102 has substantially the same configuration as the first holding shaft body 32, and the first holding shaft body 102 has the first configuration. The configuration of the central shaft portion 104 is different from the configuration of the first central cylindrical portion 49 of the first holding shaft body 32, and the forty-second holding shaft body 103 has substantially the same configuration as the second holding shaft body 33. Therefore, the configuration of the second central shaft portion 106 of the forty-second holding shaft body 103 is different from the configuration of the second central cylindrical portion 68 of the second holding shaft body 33. The 41st holding shaft body 102 and the 42nd holding shaft body 103 are basically the same except for the first center tube portion and the second center tube portion. The first holding shaft body 32 and the second holding shaft are the same. It is not limited to the body 33. The 21st holding shaft body 82 and the 22nd holding shaft body 83 of the holding shaft 80 may be used, and the 31st holding shaft body 92 and the 32nd holding shaft body 93 of the holding shaft 90 may be used.

  (Modification 6) In the above-described embodiment, the roll papers 60 and 160 include the core tubes 64 and 164. However, it is not essential for the roll paper to wind printing paper around the core tube. The center hole may be formed with printing paper.

  (Modification 7) In the above embodiment, the print sheets 61 and 161 are continuous sheets, but the print sheets are not limited to continuous sheets. It may be a printing paper having a configuration in which a plurality of printing papers are arranged on a mount.

The technical idea grasped from the above-described embodiments and modifications will be described below.
(Technical Idea 1) The first holding shaft body includes a first central shaft portion in which the first rotating shaft portion is formed at one end and the first coupling portion is formed at the other end, and the first central shaft. A plurality of first protrusions that protrude radially from the portion and extend in the axial direction, and are loosely fitted into the core hole by the top surfaces of the plurality of first protrusions to pivot the roll paper The roll paper holding shaft according to claim 1, wherein the roll paper holding shaft has a polygonal column shape to be supported, and the groove portion is formed in at least one of the plurality of protrusions.

  (Technical thought 2) The second holding shaft body has a second central shaft portion in which the second rotation shaft portion is formed at one end and the second rotation shaft portion is formed in the other end, and the second center. A plurality of second protrusions projecting radially from the shaft and extending in the axial direction, and plate-like couplings connecting the plurality of second protrusions at the ends in contact with the first holding shaft body A plurality of second protrusions, and the top surfaces of the plurality of second protrusions form a polygonal column shape that is loosely fitted into the core hole and pivotally supports the roll paper. 2. The roll paper holding shaft according to claim 1, wherein the roll paper holding shaft is formed closer to the second central shaft than a plane connecting the tops of the two protruding portions.

1 is a perspective view of a printing apparatus according to the present invention. The perspective view which shows a roll paper holding | maintenance apparatus part. The external appearance perspective view of a holding shaft. (A) Sectional drawing of a holding shaft. (B) Sectional drawing of the state in which the holding shaft was inserted into the core tube of the roll paper. (A) The external appearance perspective view of a press member. (B) The external appearance perspective view of a 1st holding shaft body. (C) The external appearance perspective view of the 2nd holding shaft body. The perspective view which shows a roll paper holding | maintenance apparatus part. FIG. 3 is an external perspective view of the printing apparatus as viewed from an obliquely upper side close to a plan view. The rear view of a roll paper holding device. FIG. 3 is a rear view of the roll paper holding device in a state where roll paper is set. FIG. 5 is a schematic diagram for explaining a relationship between a roll paper position and a printing position. (A) Sectional drawing of the state in which the 2nd holding shaft was inserted in the core pipe of roll paper. (B) Sectional drawing of the state in which the 3rd holding shaft was inserted in the core pipe of roll paper. Sectional drawing of a 4th holding shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus, 12a ... Support frame part, 12b ... Support frame part, 16a ... Bearing groove, 16b ... Bearing groove, 17a, 17b ... Guide wall board, 18 ... Engagement groove, 20 ... Roll paper holding device, 30, 80, 90, 100 ... holding shaft, 31 ... holding shaft, 31a ... rotating shaft, 31b ... rotating shaft, 31c ... engaging shaft, 31d ... E-shaped groove, 32 ... first holding shaft, 33 ... Second holding shaft body 34 ... Pressing member 36 ... E type retaining ring 37 ... Pressing member body 37a ... Top surface 38 ... First engaging projection 39 ... Second engaging projection 49 ... First center Cylindrical part, 52a ... flange, 53 ... first projecting plate, 54 ... projecting body, 56 ... first central shaft hole, 57 ... projecting body plate, 57a ... engagement rod, 58 ... top plate part, 59 ... engagement recess 60, 160 ... roll paper, 61, 161 ... printing paper, 64, 164 ... core tube, 65, 165 ... center , 65a, 165a ... inner wall, 66 ... groove, 66a ... groove upper opening, 66b ... groove end opening, 66c ... flange opening, 68 ... second central cylinder, 69 ... second projecting plate, 71 ... coupling plate, 72 ... second Central shaft hole 73 ... Slope, 82 ... 21st holding shaft body, 83 ... 22nd holding shaft body, 84 ... first outer peripheral surface, 84a ... first maximum diameter portion, 84b ... first inclined portion, 86 ... second Outer peripheral surface, 86a: second maximum diameter portion, 86b: rear second inclined portion, 86c ... tip second inclined portion, 86d ... tip inclined portion, 90 ... holding shaft, 92 ... 31st holding shaft body, 93 ... 32nd Holding shaft body 94... Projection body 94 a. Projection body highest portion 94 b. Projection body slope portion 95. First projection plate 95 a. Projection plate top portion 95 b. Projection plate slope portion 96. 96a ... protruding plate highest portion, 96b ... protruding plate rear slope portion, 96c ... protruding plate tip slope portion, 96d ... oblique 98 ... coupling plate, 102 ... 41st holding shaft, 103 ... 42nd holding shaft, 104 ... first central shaft, 104a ... first coupling, 104b ... rotating shaft, 106 ... second central shaft 106a, second coupling portion, 106b, rotating shaft portion, 106c, engaging shaft portion.

Claims (19)

A roll paper holding shaft that has a shape that can be loosely fitted into the core hole of the roll paper, and is loosely fitted into the core hole to pivotally support the roll paper,
In the state where the roll paper holding shaft is loosely fitted in the core hole, the roll paper holding shaft includes a pressing member that presses the inner wall surface of the core hole by a force biased outward in the radial direction of the holding shaft. Roll paper holding shaft. A roll paper holding shaft that penetrates the core hole of the roll paper and pivotally supports the roll paper,
A holding shaft that has a shape that can be loosely fitted into the core hole, and that is loosely fitted into the core hole and pivotally supports the roll paper;
It is loosely fitted in a groove provided in the holding shaft body, is slidable in the radial direction of the holding shaft body and supported in a retaining state, and is urged outward in the radial direction of the holding shaft body. A pressing member,
A part of the pressing member is formed so as to protrude from the outer peripheral surface of the holding shaft body,
In a state where the holding shaft body is loosely fitted in the core hole, the pressing member protruding from the holding shaft body pushes the inner wall surface of the core hole by a force urging outward in the radial direction of the holding shaft body. A roll paper holding shaft that is pressed. The force that urges the pressing member in the radially outer direction of the holding shaft body and causes the pressing member to press the inner wall surface of the core hole,
The force required to insert or remove the roll paper holding shaft with respect to the core hole is a force that is equal to or greater than the force necessary to support the weight of the roll paper holding shaft. The roll paper holding shaft according to claim 1, wherein: The holding shaft is
A first holding shaft body in which the groove portion is formed and the pressing member is loosely fitted;
The first holding shaft body is provided with a second holding shaft body that is continuous with the first holding shaft body in the axial direction so as to be coaxial with the first holding shaft body. The roll paper holding shaft according to Item. The first outer peripheral surface of the first holding shaft body is in contact with the inner surface of the core hole loosely fitted to the first holding shaft body and supports the roll paper, and the first maximum diameter portion. A first inclined portion that is a substantially frustoconical peripheral wall with the end surface on the part side as the bottom surface and the end surface in the axial direction of the first holding shaft body as the top surface;
The second outer peripheral surface of the second holding shaft body is in contact with the inner surface of the core hole loosely fitted to the second holding shaft body to support the roll paper, and the second maximum diameter. A second inclined portion that is a substantially frustoconical peripheral wall with the end surface on the part side as the bottom surface and the end surface side in the axial direction of the second holding shaft body as the top surface;
The outer diameter of the first maximum diameter portion and the outer diameter of the second maximum diameter portion are substantially the same, and the first maximum diameter portion and the second maximum diameter portion cooperate to form the roll paper. The roll paper holding shaft according to claim 4, wherein the roll paper holding shaft is supported. The groove includes an outer opening provided on the first outer peripheral surface of the first holding shaft body, and a side opening provided on an end surface on a side in contact with the second holding shaft body and communicating with the outer opening. Have
The side opening is formed so that the pressing member can be inserted into the groove from the side opening,
The said outer opening is formed so that a part of said pressing member can protrude outside the said 1st outer peripheral surface of the said holding shaft body from the said outer opening. Roll paper holding shaft. A holding center shaft formed with a rotation shaft portion engageable with a bearing that rotatably holds the roll paper holding shaft holding the roll paper around the axis at both ends;
The said holding shaft body is externally fitted to the said holding | maintenance center axis | shaft so that the outer diameter of the said holding shaft body may become substantially coaxial with the said holding | maintenance center axis | shaft. 2. A roll paper holding shaft according to item 1.   The holding shaft body externally fitted to the holding central shaft is disposed between a pair of locking members fixed to the holding central shaft, and is rotatably fitted to the holding central shaft and the pair of holding members. The roll paper holding shaft according to claim 7, wherein movement of the holding center axis in the axial direction relative to the holding center axis is restricted by the locking member.   The roll paper holding shaft according to claim 7, wherein the holding shaft body externally fitted to the holding central shaft is fixed to the holding central shaft. A flange capable of regulating the position of one side of the roll paper axially supported by the first holding shaft body is provided at an end of the first holding shaft body on the side in contact with the locking member. Formed integrally with the holding shaft,
The strength of the flange with respect to the axial force that the flange receives from the roll paper is the strength of the locking member with respect to the axial force that the locking member receives from the first holding shaft, or the locking member The roll paper holding according to any one of claims 7 to 9, wherein the roll paper holding strength is smaller than either the fixing strength of the holding shaft to the holding central shaft or the fixing strength of the holding shaft body to the holding central shaft. axis. The first holding shaft is
A first central tube portion engaged with the holding central shaft;
A plurality of first protrusions projecting radially from the first central cylinder and extending in the axial direction;
The top surfaces of the plurality of first protrusions form a polygonal column shape that is loosely fitted into the core hole and pivotally supports the roll paper,
The roll paper holding shaft according to any one of claims 7 to 10, wherein the groove is formed in at least one of the plurality of protrusions. The second holding shaft body is
A second central tube portion engaged with the holding central shaft;
A plurality of second projecting portions projecting radially from the central tube portion and extending in the axial direction;
A plate-like coupling plate that couples the plurality of second projecting portions at an end on the side in contact with the first holding shaft body;
The top surfaces of the plurality of second protrusions form a polygonal column shape that is loosely fitted into the core hole and pivotally supports the roll paper,
The roll paper according to any one of claims 7 to 11, wherein the coupling plate is formed closer to the second central tube portion than a plane connecting the tops of the second protrusions. Holding shaft. In the first holding shaft body,
A first shaft body part in which the core hole is loosely fitted, and a first rotating shaft part formed at one end of the first shaft body part so as to be coaxial with the first shaft body part;
A first coupling part formed at the other end of the first shaft body part;
An outer diameter side of the first shaft body part and a first groove part formed with the first coupling part and opening at an end face;
In the second holding shaft body,
A second shaft body part in which the core hole is loosely fitted;
A second rotating shaft portion formed at one end of the second shaft body portion so as to be coaxial with the second shaft body portion;
The first holding shaft is formed at the other end of the second shaft body portion and is coupled to the first coupling portion so that the first shaft body portion and the second shaft body portion are coaxial. A second coupling part for coupling the body and the second holding shaft body,
The pressing member is loosely fitted in the groove provided in the first shaft body portion, is slidable in a radial direction of the first shaft body portion, and is supported in a retaining state, and the first shaft The roll paper holding shaft according to any one of claims 4 to 6, wherein the roll paper holding shaft is biased outward in a radial direction of the body portion.   A roll paper holding device comprising the roll paper holding shaft according to claim 1. A roll paper holding shaft that supports the roll paper through the core hole in the center of the roll paper;
A pair of supports having bearing groove portions arranged so as to be able to support rotating shaft portions protruding from both ends of the roll paper holding shaft, and holding the roll paper holding shaft holding the roll paper so as to be rotatable around the axis. A frame part;
A roll paper holding device comprising: a pressing portion that presses a side surface of the roll paper held by a roll paper holding shaft and positions the roll paper at a reference position;
The roll paper holding device according to claim 1, wherein the roll paper holding shaft is the roll paper holding shaft according to claim 1.   A printing apparatus comprising the roll paper holding device according to claim 14.   A printing apparatus comprising the roll paper holding device according to claim 15.   A processing apparatus comprising the printing apparatus according to claim 16. A processing apparatus comprising the printing apparatus according to claim 17.

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