JP2018100696A - Printer and manufacturing method for shaft device in printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of coupling a shaft member constituting a shaft device which the printer comprises and a coupling member in a centered state by relatively simple work, and a manufacturing method for a shaft device in the printer.SOLUTION: A shaft device 60 comprises: a drive roller 43 (as one example of a shaft member); a coupling member 61 (coupling member) capable of being coupled to an end portion of the drive roller 43; and a centering coupling mechanism 70. The centering coupling mechanism 70 comprises: a first coupling section 432 which the drive roller 43 has at the end portion; a second coupling section 62 which the coupling member 61 has at an end portion; an insertion section 623 provided on one of the first coupling section 432 and the second coupling section 62; a screw hole 652 provided on the other one thereof; and a coupling member 66 having a screw shaft portion 661 screwed into the screw hole 652 in a state of being inserted into the insertion section 623. The coupling member 66 can perform coupling such that the first coupling section 432 and the second coupling section 62 approach each other via screwing between the screw shaft section 661 and the screw hole 652.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a printing apparatus provided with a shaft device including a shaft member rotatably supported by the printing device and a connecting member connected in a centered state to an end of the shaft member, and a shaft device in the printing device. It relates to the manufacturing method.

  For example, the printing apparatus includes a conveyance unit that conveys a medium such as paper, and a printing unit that prints on the medium conveyed by the conveyance unit. As this type of transport unit, for example, a roller system including a roller pair that rotates and conveys a medium while sandwiching the medium, or a belt system that conveys a medium by rotation of a conveyor belt that is hung on a plurality of rollers. Are known. A roller (an example of a shaft member) constituting this type of transport unit is connected to a drive shaft that is rotated by the power of a drive source such as an electric motor or an output shaft of the drive source via a connection member such as a coupling member. . In addition, a rotation detector such as a rotary encoder may be connected to the end of the roller via a connecting member.

  In such a shaft device configured by connecting a shaft member such as a roller and a connecting member, both shaft centers coincide with each other in order to suppress the eccentricity of the other of the shaft member and the connecting member with respect to one shaft center. It is necessary to connect in a centered state.

  For example, Patent Document 1 includes a drive shaft having an engagement pin, a driven shaft having an engagement pin, and a connecting member (coupling) having a groove portion, and both the engagement pins are fitted into the groove portion to drive the drive shaft. A shaft device that engages a connecting member with a driven shaft is disclosed. Patent Document 2 discloses that the diameter of the shaft member varies in the circumferential direction on the inner peripheral flat surface of the plurality of fixing members interposed between the outer peripheral surface and the inner peripheral surface of the shaft member and the connecting member. Among these, a shaft device is disclosed that enables transmission of rotation by disposing a fixing member radially outward by causing large-diameter convex portions to face each other to press-contact the shaft member and the connecting member.

JP 2014-178036 A JP 2006-250336 A

  By the way, in the shaft device disclosed in Patent Document 1, since the drive pin is connected to the connecting member by fitting the engaging pin in the groove portion, some clearance is required at the connecting portion between the shaft member and the connecting member. Become. In addition, since the shaft device described in Patent Document 2 is configured to connect using the pressure contact between the shaft member and the connecting member due to the radial displacement of the fixed member, when connecting the shaft member and the connecting member Some clearance is required. For this reason, the conventional shaft device has a problem that alignment between the shaft member and the connecting member is insufficient due to this kind of gap. Note that the above-described problem is not limited to the shaft device that configures the transport unit, and is also generally applied to the shaft device that configures other parts than the transport unit in the printing apparatus, such as a printing unit that prints on a medium transported by the transport unit. Common.

  An object of the present invention is to provide a printing apparatus capable of connecting a shaft member and a connecting member constituting a shaft apparatus included in the printing apparatus to a centered state by a relatively simple operation, and manufacture of the shaft apparatus in the printing apparatus. It is to provide a method.

  A printing apparatus that solves the above-described problem is a printing apparatus that includes a shaft device, and the shaft device is rotatably supported and includes a shaft member having a first connection portion at an end portion, and the first connection portion. The first connection portion and the second connection in a state of being inserted into a connection member having a connectable second connection portion, and an insertion portion provided in one of the first connection portion and the second connection portion. And the first connecting portion and the first through the threaded engagement between the threaded portion and the threaded portion. A fastening member capable of fastening the two connecting portions close to each other, and the fastening member inserted through the insertion portion is connected to the first connecting portion by screwing between the screwing portion and the screwed portion. By fastening between the first connecting portion and the second connecting portion, the first connecting portion and the second connecting portion are connected in a centered state. It is.

  According to this configuration, the fastening member is inserted into the insertion portion provided in one of the first connection portion and the second connection portion, and the screwing portion of the fastening member is connected to the first connection portion and the second connection portion. The first connecting portion and the second connecting portion are aligned with each other by screwing into a screwed portion provided on the other of the two and bringing the first connecting portion and the second connecting portion closer to each other. Connected. For this reason, a shaft member and a connection member can be connected to the state centered comparatively easily.

Preferably, the printing apparatus further includes a drive shaft that transmits a rotational driving force to the shaft member, and the connection member is a coupling member that connects the shaft member and the drive shaft.
According to this configuration, since the shaft member and the coupling member are connected in a centered state, eccentric rotation of the shaft member that rotates by the rotational driving force transmitted from the drive shaft via the coupling member occurs. It becomes difficult.

  In the printing apparatus, the shaft member is a cylindrical member, the insertion portion is provided in the coupling member, the screwed portion is provided in the shaft member, and the shaft device is provided on the shaft member. It is preferable that a member to be fastened is attached to the shaft member so that the screwed portion can be disposed in the cylinder.

  According to this structure, even if a shaft member consists of a cylindrical member, a to-be-threaded part can be arrange | positioned in the cylinder of a shaft member by attaching a to-be-fastened member to a shaft member. For this reason, the screwing portion of the fastening member inserted through the insertion portion of the connecting member is screwed into the screwed portion disposed in the cylinder of the shaft member to bring the first connecting portion and the second connecting portion closer to each other. Thereby, the 1st connection part and the 2nd connection part can be connected in the state centered. For example, eccentric rotation is unlikely to occur in the shaft member that is rotated by the driving force transmitted from the drive shaft through the connecting member.

  In the printing apparatus, the shaft device is centered between the first connection portion and the second connection portion in a process in which the first connection portion and the second connection portion approach each other by fastening the fastening member. It is preferable to further include a centering guide portion for guiding the state.

According to this structure, the 1st connection part and the 2nd connection part can be connected in the state centered by the simple operation | work which fastens a fastening member.
In the above printing apparatus, when the fastening member is a first fastening member, the insertion portion is a second threaded engagement in which a threaded portion of a second fastening member having a larger diameter than the fastening member can be screwed. It is preferable to have a part.

  According to this configuration, in a state where the shaft member and the connecting member are connected, the second fastening member is formed by screwing the screwed portion of the second fastening member with the second screwed portion of the insertion portion. However, when it hits the part having the threaded portion and the fastening of the second fastening member proceeds in that state, the first connecting portion and the second connecting portion are separated from each other. Therefore, even if the shaft member and the connecting member are connected in a centered state, they can be removed relatively easily. For example, it is easy to replace the shaft member.

  A method of manufacturing a shaft device in a printing apparatus that solves the above problem includes a cylindrical shaft member that is provided in the printing device and has a first connection portion at an end, and a second connection portion that can be connected to the first connection portion. A connecting member having an insertion step of inserting a fastening member into an insertion portion provided on one of the first connecting portion and the second connecting portion; and The screw member of the fastening member is screwed into the screwed portion of the fastened member provided on the other of the first connecting portion and the second connecting portion, and the shaft member and the connecting member are brought close to each other. A connecting step of connecting the first connecting portion and the second connecting portion to the centered state by causing the first connecting portion and a first removing step of removing the fastening member from the screwed portion after the connecting step; The fastening member is removed from the other of the first connecting portion and the second connecting portion. And a to second removing step.

  According to this manufacturing method, the shaft member and the connecting member can be connected in a centered state, and in order to remove the fastening member and the fastened member that are necessary in the connection process, but are unnecessary after the connection. The structure can be simplified by reducing the number of parts of the shaft device. Further, since the fastening member and the fastened member can be repeatedly used as a kind of jig, it contributes to the reduction of the manufacturing cost of the shaft device.

1 is a schematic cross-sectional view illustrating a printing apparatus according to a first embodiment. The perspective view which shows the drive system containing a shaft apparatus. The perspective view which shows the principal part of the drive system containing a shaft apparatus. The disassembled perspective view which shows the principal part of a shaft apparatus. The perspective view which shows a connection member. The sectional side view which shows the principal part of a shaft apparatus. The sectional side view which shows the state which inserted the to-be-fastened member in order to connect a shaft member and a connection member. The sectional side view which shows the process in which the small diameter 1st fastening member is fastened in order to connect a shaft member and a connection member. The sectional side view which shows the process in which the large diameter 2nd fastening member is fastened in order to remove the connection of a shaft member and a connection member. The perspective view which shows the principal part of the shaft apparatus in 2nd Embodiment. The sectional side view which shows the principal part of a shaft apparatus. The principal part side sectional view which shows the manufacturing method of a shaft apparatus. The partially broken side view which shows the shaft apparatus in 3rd Embodiment. The sectional side view which shows the principal part of a shaft apparatus. The sectional side view which shows the process in which the large diameter 2nd fastening member is fastened in order to remove the connection of the shaft member which comprises a shaft apparatus, and a connection member. The sectional side view which shows the principal part of the shaft apparatus of the example of a change. FIG. 17 is a side sectional view showing a main part of a shaft device according to a modified example different from FIG. The schematic diagram which shows the electrophotographic printing apparatus to which a shaft apparatus is applied.

(First embodiment)
Hereinafter, a first embodiment of a printing apparatus will be described with reference to the drawings. The printing apparatus is, for example, a large format printer that performs printing on a long medium having a large size.

  As illustrated in FIG. 1, the printing apparatus 11 includes a support base 12, a housing section 13 fixed on the support base 12, a support section 20 that supports the medium M, and the medium M indicated by arrows in FIG. 1. A transport device 25 that transports in the direction and a printing unit 50 that performs printing on the medium M are provided.

  In the following description, one direction along the width direction orthogonal to the longitudinal direction of the medium M (the direction orthogonal to the paper surface in FIG. 1) is defined as the scanning direction X, and the medium M is conveyed at a position where the printing unit 50 performs printing. Let the direction be the transport direction Y. In the present embodiment, the scanning direction X and the transport direction Y intersect with each other (preferably orthogonal), and both intersect with the gravity direction Z (preferably orthogonal). The scanning direction may be referred to as the width direction X.

  As illustrated in FIG. 1, the support unit 20 includes a first support unit 21, a second support unit 22, a third support unit 23 that form a conveyance path of the medium M, and a lower part of the second support unit 22. And a suction mechanism 24 disposed on the side. The first support portion 21 has an inclined surface that is inclined so that the downstream side is higher than the upstream side in the transport direction Y. The second support unit 22 is provided at a position facing the printing unit 50 and supports the medium M on which printing is performed. The third support unit 23 has an inclined surface that is inclined so that the downstream side is lower than the upstream side in the transport direction Y, and guides the medium M on which printing has been performed by the printing unit 50. The second support unit 22 has a plurality of suction holes (not shown) on the support surface that supports the medium M, and the medium M to be printed is sucked through the suction holes by driving the suction mechanism 24. Suppresses lifting.

  Next, the configuration of the transport device 25 will be described in detail. As shown in FIGS. 1 and 2, the transport device 25 includes a feeding unit 30 that feeds the medium M, and a transport unit 40 that transports the medium M fed from the feeding unit 30 along the transport direction Y. And. The feeding unit 30 includes a holding unit 33 having a roll body support unit 32 that rotatably supports a roll body 31 in which the medium M is wound in a roll shape, and a feed that outputs power for rotating the roll body 31 forward and backward. And a motor 34. The feeding unit 30 includes a rotation detector 35 that can detect the rotation of the roll body support unit 32.

  As illustrated in FIG. 1, the transport unit 40 is an example of a roller pair 41 that sandwiches the medium M and transports the medium M along the transport direction Y, and a drive source that outputs power to transport the medium M to the roller pair 41. A transport motor 42. The roller pair 41 is configured by a pair of a driving roller 43 as an example of a shaft member that is rotatably supported and a driven roller 44 that rotates following the rotating driving roller 43. The drive roller 43 is supported by a pair of support members 45 disposed at two positions separated by a predetermined distance in the width direction X, for example. In this example, the driven roller 44 is supported by a changing unit 46 that can change the pressing force against the driving roller 43. The changing unit 46 changes the pressing force of the driven roller 44 against the driving roller 43 to adjust the holding force (nip force) at which the roller pair 41 holds the medium M.

  Here, when the driving roller 43 rotates eccentrically, the nip force with which the roller pair 41 pinches the medium M fluctuates, and this causes an unexpected slip between the roller pair 41 and the medium M, and the conveyed medium. The stop position of M is deviated from the target position, and the conveyance position accuracy is lowered. For this reason, it is desirable that the drive roller 43 be supported in a state where eccentricity is suppressed.

  The drive roller 43 can perform forward rotation for transporting the medium M downstream in the transport direction Y and reverse rotation for transporting the medium M upstream in the transport direction Y by forward / reverse driving of the transport motor 42. Yes. Then, when the driving roller 43 is rotated by the power of the transport motor 42, the medium M is transported along the upper surface of the support unit 20 while being sandwiched between the roller pair 41. The transport unit 40 includes a rotation detector 47 that can detect the rotation of the drive roller 43.

  As shown in FIG. 1, the printing unit 50 prints on the medium M at a position downstream of the roller pair 41 in the transport direction Y. The printing unit 50 includes a liquid ejecting unit 53 that ejects ink onto the medium M in the printing area PA. The printing unit 50 employs, for example, a serial printing method, and includes a carriage 52 that can reciprocate in the scanning direction X along the guide shaft 51 by driving a carriage motor (not shown). The liquid ejecting unit 53 provided in the carriage 52 forms characters and images on the medium M by ejecting ink toward the medium M supported by the support unit 20 when the carriage 52 moves along the scanning direction X. Perform the printing operation. The printing apparatus 11 includes a control unit 100 that controls the transport device 25 and the printing unit 50 illustrated in FIG. Note that a line printing method may be employed as the printing unit 50. In this case, the liquid ejecting unit 53 of the line printing method is arranged such that a long one slightly longer than the assumed maximum width of the medium extends along the width direction X and is conveyed at a constant speed. A printing operation is performed by ejecting ink onto the medium M.

  Next, the shaft device 60 will be described with reference to FIG. The shaft device 60 of the present embodiment includes a driving roller 43 constituting a roller pair 41 (see FIG. 1), a connecting member 61 that connects the driving roller 15 and the driving roller 43 that are rotationally driven by the power of the transport motor 42, and Is provided. The drive shaft 15 transmits the rotational drive force to the drive roller 43. Further, the connecting member 61 is configured to be connectable to the end portion of the driving roller 43. The connecting member 61 of this example is a coupling member 610 that connects the driving roller 43 and the driving shaft 15 so as to be integrally rotatable. The drive roller 43 and the coupling member 610 are connected via a centering connection mechanism 70.

  As shown in FIG. 2, the driving roller 43 has a plurality of roller portions 431 arranged in a line in the axial direction. The surface of the roller portion 431 is formed with fine grooves or fine irregularities (both not shown) over the entire circumferential surface, and the conveying force of the medium M held by the roller pair 41 due to the high friction of the surface is Secured.

  As shown in FIGS. 2 and 3, a gear 17 is fixed to the other end portion of the drive shaft 15. The gear 17 constitutes a part of a power transmission mechanism (not shown) that transmits the rotation of the output shaft 421 (shown in FIG. 3) of the transport motor 42 to the drive shaft 15. Further, a disk-shaped code plate 471 constituting a rotation detector 47 (rotary encoder) is fixed to the outer side of the drive shaft 15 coaxially with the gear 17.

  As shown in FIGS. 2 and 3, the driving roller 43 is rotatable at both axial end portions with respect to a pair of support members 45 (only one is shown in FIG. 3) via a bearing (bearing). It is supported. The pair of support members 45 are erected at two positions separated in the scanning direction X by a distance slightly longer than the assumed maximum width of the medium M. The support member 45 is erected upward (−Z direction) from a bottom plate portion 451 fixed to a frame (not shown) constituting the housing portion 13 (see FIG. 1).

  As shown in FIG. 3, insertion holes 452 having diameters larger than the diameters at both ends of the drive roller 43 are provided at positions corresponding to the installation height of the drive roller 43 in the pair of support members 45. . The drive roller 43 is rotatably supported with respect to the support member 45 by inserting annular bearings 16 (for example, bearings) fitted to both ends of the drive roller 43 into the insertion holes 452 of the support member 45. Yes.

  As shown in FIG. 3, the drive roller 43 has a first connecting portion 432 at one end. In addition, the connecting member 61 has a second connecting portion 62 that can be connected to the first connecting portion 432. The first connecting portion 432 is press-fitted into the second connecting portion 62 of the connecting member 61 at a position slightly outside (the drive shaft 15 side) of the bearing 16 on one end side. The drive roller 43 and the connecting member 61 are coaxially connected by press-fitting the first connecting portion 432 and the second connecting portion 62. In this embodiment, the 1st connection part 432 and the 2nd connection part 62 are connected to the state centered by aligning both axial centers via the centering connection mechanism 70. As shown in FIG. The connecting member 61 has a cylindrical connecting portion 63 coaxially adjacent to the cylindrical second connecting portion 62. One end portion of the drive shaft 15 is fitted into the cylindrical connection portion 63, and the drive shaft 15 and the cylindrical connection portion are connected by a plurality of screws 64 (only one is shown in FIG. 3) fastened from the outside of the cylindrical connection portion 63. 63 is fixed. Note that the fastened member 65 constituting the centering connecting mechanism 70 is provided in the first connecting portion 432 of the driving roller 43 that is a cylindrical member so as to penetrate the first connecting portion 432 in the radial direction.

  As shown in FIG. 3, when the axis of the drive shaft 15 and the drive roller 43 connected via the connecting member 61 is shifted, the drive roller 43 rotates eccentrically with respect to the drive shaft 15. Since the drive roller 43 is supported by the support member 45 via the bearing 16, it is preferable that the shaft centers of the drive shaft 15 and the drive roller 43 coincide as much as possible, although eccentric rotation is suppressed to some extent. Therefore, in the present embodiment, the first connecting portion 432 of the driving roller 43 and the second connecting portion 62 of the connecting member 61 are connected to the centered state via the centering connecting mechanism 70.

  As shown in FIG. 3, the connecting member 61 includes a bottomed cylindrical second connecting portion 62 and a cylindrical tubular connecting portion 63. The 2nd connection part 62 and the cylindrical connection part 63 are arrange | positioned along with the axial direction in the state in which both axial lines correspond. In this example, since the outer diameter of the one end portion of the drive roller 43 is larger than the outer diameter of the one end portion of the drive shaft 15, the inner diameter of the press-fitting hole of the second connecting portion 62 is the fitting hole 631 of the cylindrical connecting portion 63. It is larger than the inner diameter. The magnitude relationship between the outer diameter of the driving roller 43 and the outer diameter of the driving shaft 15 can be changed as appropriate. For example, the outer diameter of the driving shaft 15 may be larger than the outer diameter of the driving roller 43.

  The power transmission mechanism between the conveyance motor 42 and the drive shaft 15 shown in FIG. 3 includes, for example, a belt-type power transmission mechanism including a gear train (wheel train) or a belt (for example, a toothed belt). Is transmitted to the gear 17. The gear 17 meshes with a train wheel (not shown) and has a function of transmitting the rotation of the drive shaft 15 to another roller (for example, a discharge roller) through the train wheel. The code plate 471 has a large number of light transmitting portions 472 (for example, slits) arranged at a constant pitch over the entire circumference. The sensor 473 constituting the rotation detector 47 (rotary encoder) has a light emitting portion and a light receiving portion (both not shown) facing each other across the arrangement region of the light transmitting portions 472 of the code plate 471. The sensor outputs a detection signal (pulse signal) including a number of pulses proportional to the amount of rotation of the driving roller 43 when the light receiving unit receives light emitted from the light emitting unit and transmitted through the light transmitting unit 472. A detection signal from the sensor 473 is input to the control unit 100.

  Next, with reference to FIG. 4 and FIG. 5, the connection structure of the drive roller 43 and the connection member 61 in the shaft device 60 will be described in detail. As shown in FIG. 4, the shaft device 60 of this example includes a cylindrical driving roller 43, a connecting member 61, and a centering connecting mechanism 70 that connects the driving roller 43 and the connecting member 61 in a centered state. With.

  The first connecting portion 432 of the driving roller 43 is provided with a pair of key grooves 433 that are cut out from the end face in the axial direction over a predetermined length. In addition, the first connecting portion 432 is provided with an insertion hole 434 that can be held in a state in which the fastened member 65 is penetrated in the radial direction. The fastened member 65 is, for example, a plate-like member that can be inserted into the insertion hole 434. The fastened member 65 has a stop portion 651 (stopper portion) whose one end is bent and a screw hole 652 as an example of a screwed portion. doing. The screw hole 652 can be screwed with a screw shaft portion 661 as an example of a screwing portion of a first fastening member 66 (for example, a bolt). The fastened member 65 has a screw hole 652 to be screwed into a screw shaft portion 661 of a first fastening member 66 (hereinafter also simply referred to as “fastening member 66”). It has a function of holding in the cylinder. In the present embodiment, the fastened member 65 that holds the screw hole 652 in the cylinder of the first connecting portion 432 is provided in the first connecting portion 432.

  As shown in FIG. 5, the connecting member 61 includes a pair of key portions 621 (only one is shown in FIG. 4) that can be fitted with a pair of key grooves 433 cut out at one end of the drive roller 43, and the drive roller. And a cylindrical portion 622 into which one end portion (cylindrical end portion) of 43 can be press-fitted. The cylindrical portion 622 has a shape in which, for example, the key portion 621 is partially cut away. Further, the connecting member 61 is provided with an insertion portion 623 through which the screw shaft portion 661 (see FIG. 4) of the fastening member 66 can be inserted in the axial direction of the connecting member 61. The insertion part 623 of this example is located in the axial center of the connection member 61 as shown in FIG. 5, FIG. Further, the insertion portion 623 is provided with a screw hole 624 as an example of a second screwed portion in at least a part thereof. The inner diameter of the insertion part 623 is larger than the outer diameter of the screw shaft part 661 of the fastening member 66. In particular, the inner diameter of the screw hole 624 in the insertion portion 623 is larger than the outer diameter of the screw shaft portion 661 and smaller than the outer diameter of the head of the fastening member 66. The cylindrical portion 622 has a press-fitting surface 625 that is an inner peripheral surface having an inner diameter substantially the same as the outer diameter of one end of the drive roller 43 on the back side, and an inner peripheral surface is located outside the press-fitting surface 625 on the outer side. And a guide surface 626 that expands outward.

  In addition, as shown in FIG. 4, the cylindrical coupling portion 63 of the coupling member 61 is provided with a fitting hole 631 into which one end of the drive shaft 15 can be fitted. As shown in FIGS. 4 and 5, the cylindrical connecting portion 63 is provided with screw holes 632 at a plurality of locations in the circumferential direction. By screwing a plurality of screws 64 (see FIG. 3) into the screw holes 632 from the outside of the cylindrical connecting portion 63, the plurality of screws 64 in a state where one end portion of the drive shaft 15 is fitted in the cylindrical connecting portion 63. Thus, the connecting member 61 is fixed. The key portion 621 may be integrated with the connecting member 61 or may be separate.

  As shown in FIG. 4, the centering connection mechanism 70 of this embodiment includes an insertion portion 623 (see FIG. 5) provided on one of the first connection portion 432 and the second connection portion 62, and the first connection portion. The screw hole 652 provided in the other of the part 432 and the second connecting part 62 and the fastening member 66 having the screw shaft part 661 that can be screwed into the screw hole 652 are provided. In this example, the fastened member 65 constitutes a part of the centering connection mechanism 70. Then, the first connecting portion 432 of the driving roller 43 is press-fitted into the second connecting portion 62 of the connecting member 61 while being centered via the centering connecting mechanism 70, whereby the shaft shown in FIG. A device 60 is manufactured. In the centering connection mechanism 70, the screw shaft portion 661 of the fastening member 66 inserted through the insertion portion 623 is screwed into the screw hole 652, so that the first connection portion 432 and the second connection portion 62 are press-fitted into the core. It is connected in the extended state.

  In the shaft device 60 shown in FIG. 6, the fastened member 65 is inserted into the insertion hole 434 of the first connecting portion 432 and penetrates the cylinder in the radial direction. In a state where the fastened member 65 is held by the first connecting portion 432 by the stopper 651, the screw hole 652 is located at the center of the first connecting portion 432 in the cylinder. The fastening member 66 is inserted into the insertion portion 623 from the outside of the connection member 61 (on the cylindrical connection portion 63 side), and the screw shaft portion 661 is screwed into the screw hole 652. The cylindrical end portion of the first connecting portion 432 is press-fitted into the cylindrical portion 622 of the second connecting portion 62 with the key portion 621 fitted in the key groove 433. As shown in FIG. 9, a second fastening member 67 (for example, a bolt) having a larger diameter than the screw shaft portion 661 of the first fastening member 66 is inserted into the insertion portion 623 provided in the second coupling portion 62. The above-described screw hole 624 into which a screw shaft portion 671 that is an example of the screwing portion can be screwed is provided.

  Next, the operation of the printing apparatus 11 including the shaft device 60 will be described. The drive roller 43 is supported by a pair of support members 45 via a pair of bearings 16. Next, as shown in FIG. 7, the fastened member 65 is inserted into the insertion hole 434 of the first connecting portion 432 of the drive roller 43, and the screw hole 652 is held at the center of the first connecting portion 432 in the cylinder. Next, the key portion 621 of the connecting member 61 is slightly fitted in the key groove 433 of the driving roller 43, and the cylinder end portion of the driving roller 43 is fitted to the guide surface 626 just before reaching the press-fitting surface 625 of the cylindrical portion 622, Temporarily inserted into the connecting member 61.

  Next, the fastening member 66 is inserted from the outside of the coupling member 61 (on the cylindrical coupling portion 63 side), and the screw shaft portion 661 is inserted through the insertion portion 623, and the fastening member 66 is rotated in the fastening direction to screw the fastening member 66. The fastening member 66 is fastened to the fastened member 65 through screwing of the shaft portion 661 and the screw hole 652. As the fastening member 66 is fastened in the direction indicated by the arrow in FIG. 8, the connecting member 61 and the drive roller 43 relatively move in a direction approaching each other as indicated by the white arrow in the same figure. As a result, one end portion of the driving roller 43 is press-fitted into the cylindrical portion 622 of the connecting member 61. In this fastening process, the fastening member 66 is fastened by a path passing through the axial center between the connecting member 61 and the driving roller 43, so that the driving roller 43 and the connecting member 61 approach straight along both axes. For this reason, the one end part of the driving roller 43 is smoothly press-fitted to the back of the cylindrical part 622 of the connecting member 61, and the driving roller 43 and the connecting member 61 are connected. At this time, since the one end portion of the drive roller 43 and the cylindrical portion 622 of the connecting member 61 are press-fitted without gaps, the drive roller 43 and the connecting member 61 are centered so that the axes of both are aligned.

  Thereafter, one end portion of the drive shaft 15 having an outer diameter slightly smaller than the hole diameter is fitted (gap fit) into the fitting hole 631 of the cylindrical connecting portion 63 of the connecting member 61, and the outer peripheral surface side of the cylindrical connecting portion 63 is inserted. A plurality of screws 64 are screwed and fixed at a plurality of locations, and the drive shaft 15 is connected to the connecting member 61. The drive shaft 15 is rotatably supported by a frame (not shown), and the gear 17 and the code plate 471 of the rotation detector 47 are coaxially fixed to the other end. Then, the rotation output of the output shaft of the transport motor 42 is transmitted through a power transmission mechanism (not shown), so that the gear 17 rotates. The rotation of the gear 17 rotates the drive roller 43 together with the drive shaft 15. At this time, since the drive roller 43 is centered with respect to the connecting member 61, the drive roller 43 rotates with almost no eccentricity. As a result, the medium M can be transported in a state where fluctuations in the clamping force (nip force) of the roller pair 41 are suppressed to a small level. For this reason, the conveyance position accuracy of the medium M that is nipped and conveyed by the roller pair 41 is ensured, and printing with high print quality is performed.

  Further, when the driving roller 43 comes to be replaced due to long-term use, the screw 64 is loosened and the driving shaft 15 is removed from the connecting member 61. Next, the fastening member 66 is rotated in the direction opposite to that during fastening (removal direction), and the screw shaft portion 661 is removed from the screw hole 652 of the fastened member 65.

  Next, as shown in FIG. 9, the screw shaft portion 671 of the second fastening member 67 is screwed into the screw hole 624 of the insertion portion 623, so that the tip of the screw shaft portion 671 hits the member to be fastened 65 and presses it. Due to the force, the connecting member 61 and the fastened member 65 move relative to each other in a direction away from each other as indicated by an outline arrow in FIG. As a result, the connection by press-fitting between the one end portion of the driving roller 43 and the cylindrical portion 622 of the connecting member 61 is removed. Therefore, even if the driving roller 43 is strongly press-fitted with the connecting member 61 being centered, the connection between the driving roller 43 and the connecting member 61 can be removed relatively easily. The shaft device 60 may be assembled to the support member 45 after the driving roller 43 and the connecting member 61 are connected, or the driving roller 43 and the driving shaft 15 are connected via the connecting member 61. You may go after.

As described above, according to the above embodiment, the following effects can be obtained.
(1) The shaft device 60 provided in the printing apparatus 11 is rotatably supported, and can be connected to the driving roller 43 as an example of a shaft member having the first connecting portion 432 at the end and the first connecting portion 432. A connecting member 61 having a second connecting portion 62, and a centering connecting mechanism 70 that connects the first connecting portion 432 and the second connecting portion 62 in a centered state. The centering connection mechanism 70 includes an insertion portion 623 provided in one of the first connection portion 432 and the second connection portion 62 (for example, the second connection portion 62), the first connection portion 432, and the second connection portion 62. And a screw hole 652 as an example of a screwed portion provided in the other (for example, the first connecting portion 432). Further, the centering coupling mechanism 70 has a screw shaft portion 661 as an example of a screwing portion that is screwed into the screw hole 652 in a state of being inserted into the insertion portion 623, and the screw shaft portion 661 and the screw hole 652 are connected to each other. A fastening member 66 capable of fastening the first connecting portion 432 and the second connecting portion 62 closer to each other via screwing is provided. The fastening member 66 inserted through the insertion part 623 is fastened by screwing the screw shaft part 661 and the screw hole 652, so that the first connection part 432 and the second connection part 62 are centered. It is connected. Accordingly, the first connecting portion 432 and the second connecting portion 62 are brought close to each other and centered by fastening by screwing the screw shaft portion 661 of the fastening member 66 inserted through the insertion portion 623 into the screw hole 652. Connected with For this reason, the drive roller 43 and the connecting member 61 can be connected to the centered state relatively easily. In addition, since the eccentricity between the drive shaft 15 and the drive roller 43 is kept small, the conveyance position accuracy when the medium M is conveyed by the roller pair 41 is increased. Further, not only skilled workers but also beginners can center the first connecting portion 432 of the driving roller 43 with respect to the second connecting portion 62 of the connecting member 61 by a relatively simple operation of fastening the fastening member 66. Can be press-fitted.

  (2) The drive shaft 15 that transmits the drive force to the drive roller 43 is provided. The connecting member 61 is a coupling member 610 that connects the drive roller 43 and the drive shaft 15. The drive roller 43 and the coupling member 610 are connected via a centering connection mechanism 70. Therefore, the eccentric rotation of the driving roller 43 that is rotated by the driving force transmitted from the driving shaft 15 via the coupling member 610 can be suppressed.

  (3) The drive roller 43 is a cylindrical member. The centering connection mechanism 70 includes a fastened member 65 that is disposed at least partially within the cylinder of the drive roller 43 and has a screw hole 652. Therefore, even if the driving roller 43 is made of a cylindrical member, the eccentric rotation of the driving roller 43 connected to the driving shaft 15 via the coupling member can be suppressed.

  (4) The insertion portion 623 is an example of a second screwed portion that can be screwed with a screw shaft portion 671 that is an example of a screwing portion of the second fastening member 67 having a larger diameter than the first fastening member 66. The screw hole 624 is. Therefore, if the screw shaft portion 671 of the second fastening member 67 is screwed into the screw hole 624 of the insertion portion 623 in the connected state of the driving roller 43 and the connecting member 61, the fastened member 65 at this time The first connecting portion 432 and the second connecting portion 62 can be moved relative to each other in the direction of separating by the force pushed by the tip of the fastening member 67. Therefore, the connection by press-fitting between the driving roller 43 and the connecting member 61 can be removed relatively easily.

  (5) The driving roller 43 and the connecting member 61 can be connected by press-fitting using the fastening member 66 and the fastened member 65 without using a large jig. For this reason, the drive roller 43 and the connecting member 61 can be connected relatively easily even when the printing apparatus 11 is manufactured in a factory or when the drive roller 43 needs to be replaced. Therefore, the manufacturing operation and the replacement operation of the drive roller 43 can be performed relatively easily.

(Second Embodiment)
Next, a second embodiment of the shaft device will be described with reference to the drawings. The second embodiment is the same as the first embodiment except that the configuration of a part of the shaft device is different from that of the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

  As shown in FIGS. 10 and 11, the shaft device 60 connects the driving roller 43 as an example of the shaft member and the connecting member 61 as in the first embodiment. However, after the connection is completed, the centering connecting mechanism 70 is connected. The fastening member 66 and the to-be-fastened member 65 (refer FIG. 11) which comprise are removed.

  Therefore, the shaft device 60 includes a cylindrical drive roller 43 having a first connection part 432 at one end, a connection member 61 having a second connection part 62 connectable to the first connection part 432, and a first connection part. A centering connection mechanism 70 that connects 432 and the second connecting portion 62 in a centered state is provided. However, in the manufacturing completion state of the shaft device 60 shown in FIGS. 10 and 11, the centering connection mechanism 70 does not include the fastening member 66 and the fastened member 65.

  The centering connection mechanism 70 is provided on the other of the insertion part 623 provided on one of the first connection part 432 and the second connection part 62 and the first connection part 432 and the second connection part 62. And a screw hole 652 as an example of a screwed portion (first screwed portion). Further, the centering connection mechanism 70 has a screw shaft portion 661 as an example of a screwing portion that can be screwed into the screw hole 652 in a state of being inserted through the insertion portion 623, and the first connecting portion 432 and the second connecting portion. Fastening members 66 that can be fastened close to each other are provided.

  The other of the first connecting part 432 and the second connecting part 62 (in this example, the first connecting part 432) has a screw hole 652 and can be attached to and detached from the first connecting part 432. A member 65 is provided. The fastened member 65 constitutes a part of the centering connection mechanism 70.

  Next, a method for manufacturing the shaft device 60 configured as described above will be described. The manufacturing method of the shaft device 60 includes an insertion step of inserting the fastening member 66 into the insertion portion 623, a first connecting portion 432 and a second connecting portion by screwing the fastening member 66 into the screw hole 652 of the fastened member 65. 62, a first removing step for removing the fastening member 66, and a second removing step for removing the fastened member 65 from the first connecting portion 432 after the connecting step.

In the insertion step, the fastening member 66 is inserted into the insertion portion 623 provided in one of the first connection portion 432 and the second connection portion 62 (in this example, the second connection portion 62).
In the connecting step, the screw shaft portion 661 of the fastening member 66 is screwed into the screw hole of the fastened member 65 provided on the other (the first connecting portion 432 in this example) of the first connecting portion 432 and the second connecting portion 62. The driving roller 43 and the connecting member 61 are brought close to each other by being screwed to 652, thereby connecting the first connecting portion 432 and the second connecting portion 62 to the centered state.

  When the connection between the drive shaft 15 and the drive roller 43 is completed in this way, after the connection step, in the next first removal step, the fastening member 66 is rotated in the direction opposite to that at the time of fastening, as shown in FIG. The member 66 is removed from the screw hole 652 of the fastened member 65.

  When the fastening member 66 is removed, in the second removal step, the fastened member 65 is pulled out from the insertion hole 434 of the drive roller 43 and removed as shown by a two-dot chain line in FIG. Thus, the fastening member 66 and the fastening member 65 used as a jig in the centering connection mechanism 70 are removed from the shaft device 60 in which the driving roller 43 and the connection member 61 are connected. When the manufacturing of the shaft device 60 is completed, the shaft device 60 is in the state shown in FIGS. 10 and 11.

  Thereafter, one end portion of the drive shaft 15 is fitted into the fitting hole 631 in the cylindrical coupling portion 63 of the coupling member 61, and a plurality of screws 64 are screwed from the outer peripheral surface side of the cylindrical coupling portion 63 at a plurality of locations. The drive shaft 15 and the connecting member 61 are connected by fixing. The drive shaft 15 is rotatably supported by a frame (not shown), and a gear 17 and a code plate 471 are coaxially fixed to the other end. Then, the rotation output of the output shaft of the transport motor 42 is transmitted through a power transmission mechanism (not shown), so that the gear 17 rotates. The rotation of the gear 17 rotates the drive roller 43 together with the drive shaft 15. At this time, since the drive roller 43 is centered so that both axial centers coincide with the connecting member 61, the drive roller 43 rotates with almost no eccentricity, and the roller pair when the medium M is conveyed. The medium M can be transported in a state where the fluctuation of the clamping force (nip force) 41 is suppressed.

  Further, when it is time to replace the drive roller 43 due to long-term use, first the screw 64 is loosened and the drive shaft 15 is removed from the connecting member 61. Next, as in the first embodiment, as shown in FIG. 9, when the screw shaft portion 671 of the second fastening member 67 is screwed into the screw hole 624 of the insertion portion 623, the tip of the second fastening member 67 With the force that hits and fastens the fastened member 65, the connecting member 61 and the fastened member 65 move relative to each other in a direction away from each other. As a result, the connection between the first connection portion 432 of the drive roller 43 and the second connection portion 62 (tubular portion 622) of the connection member 61 is removed. For this reason, even if the drive roller 43 is strongly press-fitted into the connecting member 61, the connection between them can be removed relatively easily.

According to the second embodiment, the effects (1) to (5) in the first embodiment can be obtained in the same manner, and the following effects can be obtained.
(6) The manufacturing method of the shaft device 60 includes an insertion step of inserting the fastening member 66 into the insertion portion 623 provided in one of the first connection portion 432 and the second connection portion 62 (for example, the second connection portion 62). Is provided. Also, in this manufacturing method, the screw shaft portion 661 of the fastening member 66 is screwed into the screwed member 65 provided in the other of the first connecting portion 432 and the second connecting portion 62 (for example, the first connecting portion 432). There is a connecting step of connecting the first connecting portion 432 and the second connecting portion 62 to the centered state by screwing into 652 to bring the driving roller 43 and the connecting member 61 close to each other. Further, the manufacturing method includes a first removing step of removing the fastening member 66 from the fastened member 65 and a second removing step of removing the fastened member 65 from the first connecting portion 432 after the connecting step. Therefore, the centering connecting mechanism 70 can connect the first connecting portion 432 of the driving roller 43 and the second connecting portion 62 of the connecting member 61 in a centered state, and is necessary in the connection process. Since the fastening member 66 and the fastened member 65 that are not required after the connection are removed, the number of parts of the shaft device 60 can be reduced, and the structure can be simplified and reduced in weight. Further, since the fastening member 66 and the fastened member 65 can be repeatedly used as a kind of connecting jig, the manufacturing cost of the shaft device 60 can be reduced.

(Third embodiment)
Next, a third embodiment of the shaft device will be described with reference to the drawings. In the third embodiment, a detection component that detects the rotation of the shaft member is taken as an example of a connecting member. Further, the configuration of the centering connection mechanism is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the following description will focus on the configuration different from the first embodiment.

  In the shaft device 60 shown in FIG. 13, an example of the shaft member is the drive roller 15 or the drive shaft 15 connected to one end of the drive roller 43. An example of the connecting member is a rotation detection component 81 that is connected to one end of the drive roller 43 or one end of the drive shaft 15 and detects the rotation of the drive roller 43. Therefore, the shaft device 60 includes the driving roller 43 having the first connecting portion 432 at one end or the driving shaft 15 having the first connecting portion 151 at one end and the second connecting portion 82 that can be connected to the first connecting portion 432. A rotation detection component 81, one end of the drive roller 43 or one end of the drive shaft 15, and a centering connection mechanism 70 that connects the rotation detection component 81 in a centered state. Since the connection structure via the centering connection mechanism 70 is basically the same between the case where the shaft member is the drive roller 43 and the case of the drive shaft 15, the example of the shaft member is the drive roller 43 below. A case will be described as an example.

  As shown in FIG. 13, the centering connection mechanism 70 of the present example includes an insertion portion 84 provided in one of the first connection portion 432 and the second connection portion 82, the first connection portion 432, and the second connection. A screw hole 92 as an example of a screwed portion provided on the other of the portions 82 and a screw shaft portion as an example of a screwed portion screwed into the screw hole 92 while being inserted through the insertion portion 84 And a fastening member 66 having 661. Furthermore, the centering connection mechanism 70 has a centering guide part 71 that guides both the first connection part 432 and the second connection part 82 to the centering state in the process of approaching.

  A rotation detection component 81 shown in FIG. 13 has a disk-like shape that constitutes a second connection portion 82 formed of a cylindrical block and a rotation detector 47 attached on the other end of the second connection portion 82 on the same axis. The code | symbol plate 471 is provided. The rotation detector 47 includes a code plate 471 and a sensor 473 whose detection target is the code plate 471.

  As shown in FIGS. 13 and 14, the first connection portion 432 of the drive roller 43 and the second connection portion 82 of the rotation detection component 81 are connected via a centering guide portion 71. The centering guide portion 71 has a tapered (conical frustum-shaped) convex guide surface 91 formed at one end of the first connecting portion 432 and a convex guide surface 91 fitted into one end of the second connecting portion 82. And a concave guide surface 83 recessed in a tapered shape (conical frustum shape).

  As shown in FIG. 14, the angle θ1 formed by the convex guide surface 91 with respect to the axis of the first connecting portion 432 is larger than the angle θ2 formed by the concave guide surface 83 with respect to the axis of the second connecting portion 82. Is set to For this reason, when the 1st connection part 432 and the 2nd connection part 82 approach an axial direction, the 1st connection part 432 and the 2nd connection part 82 will be by engagement with the convex guide surface 91 and the concave guide surface 83. Both axes are guided to coincide with each other.

  The screw hole 92 opens to the end surface of the convex guide surface 91 and extends over a predetermined length along the axis of the first connecting portion 432. Moreover, the insertion part 84 has penetrated the 2nd connection part 82 in the axial direction. At least a part of the insertion portion 84 is provided with a screw hole 85 as an example of a second threaded portion. A screw shaft portion 671 as an example of a screwing portion of the second fastening member 67 shown in FIG. 15 having a larger diameter than the screw shaft portion 661 of the first fastening member 66 can be screwed into the screw hole 85. ing. The inner diameter of the insertion portion 84 is larger than the outer diameter of the screw shaft portion 661 of the first fastening member 66. In particular, the inner diameter of the screw hole 85 in the insertion portion 84 is larger than the outer diameter of the screw shaft portion 661 and smaller than the outer diameter of the head of the fastening member 66.

  Next, the operation of the shaft device 60 will be described. As shown in FIG. 14, the screw shaft portion 661 of the first fastening member 66 is inserted into the insertion portion 84 and screwed into the screw hole 92 to fasten the first fastening member 66 in the direction of the arrow shown in FIG. To do. Then, the 1st connection part 432 and the 2nd connection part 82 move relatively in the direction which mutually approaches as shown by the white arrow in the figure. At this time, due to the engagement between the convex guide surface 91 and the concave guide surface 83 constituting the centering guide portion 71, the first connecting portion 432 and the second connecting portion 82 are guided to the centering state in which both axes coincide with each other. Is done. As a result, as shown in FIG. 13, the drive roller 43 (or drive shaft 15) and the rotation detection component 81 (connecting member) are connected in a centered state.

  When the driving roller 43 comes to be replaced due to long-term use of the printing apparatus 11, the first fastening member 66 having a small diameter shown in FIG. 13 is first removed. Next, as shown in FIG. 15, the second fastening member 67 detects rotation by inserting the screw shaft portion 671 of the second fastening member 67 having a large diameter into the insertion portion 84 and screwing it into the screw hole 85. The component 81 and the drive roller 43 (or the drive shaft 15) are fastened. In this fastening process, the tip of the screw shaft portion 671 of the second fastening member 67 hits the end surface of the convex guide surface 91 and presses it, so that the rotation detection component 81 and the drive roller 43 become white in FIG. As indicated by the extraction arrows, they move relative to each other in the axial direction. For example, even if the convex guide surface 91 of the drive roller 43 and the concave guide surface 83 of the rotation detection component 81 are fixed due to the long-term use of the shaft device 60, the drive roller 43 and the rotation detection The connection with the component 81 can be removed relatively easily.

As described above in detail, according to the third embodiment, the following effects can be obtained.
(7) The centering connection mechanism 70 includes a screw hole 92, which is an example of a threaded portion included in the first connection portion 432, an insertion portion 84 included in the second connection portion 62, and the fastening member 66. A centering guide portion 71 is further provided for guiding both the first connecting portion 432 and the second connecting portion 62 to the centering state in the process in which the first connecting portion 432 and the second connecting portion 62 approach each other. Therefore, the first connecting portion 432 of the drive roller 43 or the first connecting portion 151 of the drive shaft 15 and the second connecting portion 82 of the rotation detection component 81 are cored by a relatively simple operation of fastening the fastening member 66. It can be connected to the extended state.

  The above embodiment may be modified as shown below. Further, the configuration included in the above embodiment and the configuration included in the following modification example may be arbitrarily combined, and the configurations included in the following modification example may be arbitrarily combined.

  As shown in FIG. 16, the insertion portion 623 and the second screwed portion (screw hole 624) of the connecting member 61 are provided at different positions in the radial direction of the connecting member 61, and the first fastening member 66 is inserted. The position and the fastening position of the second fastening member 67 may be separated. In this case, as shown in FIG. 16, the insertion member 623 is preferably disposed on the axial center of the connecting member 61, and the screw hole 624 as an example of the second screwed portion is formed on the connecting member 61. It is arranged at a position displaced in the radial direction from the shaft center. As a result, the fastening force when the first fastening member 66 is inserted through the insertion portion 623 and the screw shaft portion 661 is screwed into the screw hole 652 of the member 65 to be fastened is the driving roller 43 and the connecting member 61. Because they work on the axis of the two, they are both difficult to tilt and they approach each other with their axes aligned. For this reason, the drive roller 43 and the connecting member 61 can be connected to a centered state by smooth press-fitting. Further, when removing the connection between the driving roller 43 and the connecting member 61, the second fastening members 67 are fastened in a balanced manner at a plurality of locations shifted in the radial direction from the axial center of the connecting member 61. It can be removed relatively easily. The fastening positions of the plurality of second fastening members 67 and the positions of the plurality of second screwed portions (screw holes 624) are preferably set to positions where their centers of gravity substantially coincide with the axis. In this case, the second threaded portion may be any of 2 to 6 locations. In FIG. 16, the drive roller 43 and the connecting member 61 are connected by exchanging the positions of the insertion portion 623 and the second screwed portion (screw hole 624) and fastening a plurality of fastening members 66. Also good.

  -A shaft member is not limited to the cylindrical member in 1st and 2nd embodiment, A solid shaft member may be sufficient. As illustrated in FIG. 17, a drive roller 43 that is an example of a shaft member is a solid shaft member. A screw hole 435, which is an example of a screwed portion that can be screwed with a screw shaft portion 661, which is an example of a screwing portion of the fastening member 66, is provided at the end of the driving roller 43. Since the driving roller 43 is solid, the fastened member 65 (see FIGS. 4 and 6) used in the first embodiment is not provided. The connection member 61 has the same configuration as that of the first embodiment, and at least a part of the insertion portion 623 included in the second connection portion 62 connected to the first connection portion 432 of the driving roller 43 is provided at the insertion portion. A screw hole 624 is formed as an example of a second screwed portion that can be screwed with a screw shaft portion 671 as an example of a screwed portion of the second fastening member 67 inserted through 623. Therefore, when the fastening member 66 is inserted into the insertion portion 623, the screw shaft portion 661 is screwed into the screw hole 435, and the fastening between the drive roller 43 and the connection member 61 is advanced, the first connection portion 432 and the first connection portion 432 are connected. The two connecting portions 62 can be connected by press-fitting in the centered state. When the connection between the driving roller 43 and the connecting member 61 is removed, the first fastening member 66 is removed, and then the screw shaft portion 661 of the second fastening member 67 indicated by a two-dot chain line in FIG. The screw hole 624 is screwed. As a result, the distal end of the screw shaft portion 671 of the second fastening member 67 hits the end surface of the solid drive roller 43 and moves relative to the direction in which the drive roller 43 and the connecting member 61 are separated due to the pressing force. The connection between them can be removed relatively easily.

  The shaft device may be applied to the electrophotographic printing device 11. As shown in FIG. 18, the electrophotographic printing apparatus 11 includes a photosensitive drum 111, a charger 112, an exposure device 113, a developing device 114, a transfer device 115, a fixing device 116, and a cleaning unit 117. The photosensitive drum 111 rotates around its rotation shaft 118, and an electrostatic latent image and a toner image are formed on its peripheral surface. The charger 112 uniformly charges the surface of the photosensitive drum 111. The exposure device 113 forms an electrostatic latent image on the circumferential surface of the charged photosensitive drum 111 by exposure to light based on the image data of the document image. The developing device 114 supplies toner to the circumferential surface of the photosensitive drum 111 and develops the electrostatic latent image formed on the photosensitive drum 111. The developing device 114 includes a plurality of rollers 119 and 120 including a developing roller 119 that carries toner on the peripheral surface. The cleaning unit 117 cleans the peripheral surface of the photosensitive drum 111 after the toner image is transferred, and has one or more rollers. The transfer device 115 transfers the toner image from the photosensitive drum 111 to a medium (sheet). The fixing device 116 performs a fixing process such as heating and pressing on the medium onto which the toner image is transferred, and includes a plurality of rollers 121. In such an electrophotographic printing apparatus 11, the shaft device 60 including the connecting member that connects the rotating shaft 118 of the photosensitive drum 111 and the drive shaft, the rotating shaft 118, and the centering connecting mechanism 70 is provided. It may be configured. Further, at least one of rollers other than the photosensitive drum 111, for example, rollers 119 and 120 constituting the developing device 114, a roller 121 constituting the fixing device 116, and a roller 122 (cleaning roller) constituting the cleaning unit 117. The shaft device may be configured similarly using a roller as an example of a shaft member. In this case, the shaft device 60 is configured by the roller, the connecting member, and the centering connecting mechanism 70, and the roller and the connecting member are connected in a centered state.

  -The threaded part is provided in the first connecting part of the cylindrical shaft member at the end, and the insertion part is provided in the second connecting part of the connecting member. An insertion portion may be provided, and a screwed portion may be provided at the second connecting portion. In this case, the fastening member inserted through the insertion portion of the first connecting portion is screwed into the screwed portion of the second connecting portion, so that the shaft member and the connecting member come close to each other and are connected in the centered state. can do.

  In the first and second embodiments, instead of the configuration in which the fastening member 65 separate from the driving roller 43 is inserted into the cylinder of the driving roller 43, the driving roller 43 is fixed to the driving roller 43 by welding or the like in advance. The structure which hold | maintains the screw hole which is an example of the to-be-joined part in a cylinder in this cylinder may be sufficient.

-It may replace with the structure which provided the 2nd to-be-threaded part in a part of insertion part, and the structure which provided the 2nd screwing part in the whole insertion part may be sufficient.
-The screwing part of a fastening member may be replaced with the screw shaft part which has a thread part on the outer peripheral surface, and the structure which has a screw part on the inner peripheral surface of a cylindrical shaft part may be sufficient. Similarly, the screwed portion to be screwed with the screwed portion of the fastening member is replaced with a screw hole, and the screw portion to be screwed with the screwed portion of the cylindrical shaft portion of the fastening member on the inner peripheral surface is the outer peripheral surface. For example, it may be a screw shaft portion that is provided above and protrudes from a member to be fastened.

The drive shaft 15 may have a cylindrical shape and may be fitted on the column portion of the connecting member. In this case, what is necessary is just to provide the insertion part 623 so that the cylindrical part of a connection member may be penetrated.
-As long as the insertion part can penetrate the screwing part (screw shaft part) of the 1st fastening member 66, not only a hole but a notch may be sufficient. In this case, a second threaded portion (for example, a screw hole) may be formed on the inner peripheral surface of the notch, or the second threaded portion is eliminated, and the connection between the driving roller and the coupling member is removed second. The structure which does not perform using this fastening member may be sufficient.

The printing apparatus is not limited to a serial printer or a line printer, and may be a lateral printer in which the carriage can move in two directions, the main scanning direction and the sub-scanning direction.
The printing device is not limited to an ink jet printer and an electrophotographic printer, but may be a dot impact printer, a thermal transfer printer, a textile printing device, or an offset printing device. For example, the present invention can be applied to a shaft device that connects any one rotation shaft (an example of a shaft member) and a connecting member among a water roller, an ink roller, a plate cylinder, a blanket, and an impression cylinder in an offset printing apparatus. The printing apparatus may be a 3D (three-dimensional) printer that forms a three-dimensional solid object by discharging resin droplets onto a medium made of a base material. Further, using a printing technique, for example, a liquid material (ink) in which functional material particles (for example, materials such as color materials (pixel materials) and wiring materials) are dispersed or mixed in the liquid is ejected to the substrate, for example, liquid crystal The printing apparatus which manufactures the electrode material, wiring, etc. which are used for manufacture of a display, an EL (electroluminescence) display, and a surface emitting display may be used.

  DESCRIPTION OF SYMBOLS 11 ... Printing apparatus, 15 ... Drive shaft, 43 ... Drive roller as an example of a shaft member, 60 ... Shaft device, 61 ... Connection member, 62 ... 2nd connection part, 63 ... Cylindrical connection part, 65 ... Fastened member , 66 ... Fastening member (first fastening member), 67 ... Second fastening member, 70 ... Centering connection mechanism, 71 ... Centering guide part, 81 ... Rotation detection component as an example of connection member, 82 ... Second connecting portion, 83 ... concave guide surface, 84 ... insertion portion, 91 ... convex guide surface, 85 ... screw hole as an example of second screwed portion, 92 ... screw hole as an example of screwed portion , 151 ... 1st connection part, 432 ... 1st connection part, 435 ... Screw hole as an example of to-be-joined part, 610 ... Coupling member, 622 ... Cylindrical part, 623 ... Insertion part, 624 ... 2nd to-be-covered Screw hole as an example of a screwed portion, 652... As an example of a screwed portion (first screwed portion) Hole, 661 ... screw shaft portion of an example of the engagement portion, the screw shaft portion of an example of a 671 ... engagement portion, M ... medium.

Claims (6)

A printing device comprising a shaft device,
The shaft device is
A shaft member rotatably supported and having a first connecting portion at an end;
A connecting member having a second connecting part connectable to the first connecting part;
The threaded portion provided on the other of the first connecting portion and the second connecting portion in a state of being inserted through the insertion portion provided on one of the first connecting portion and the second connecting portion. Fastening that can be fastened to have the first connecting part and the second connecting part approach each other through screwing of the screwed part and the screwed part. A member, and
The fastening member inserted through the insertion part is fastened between the first connection part and the second connection part by screwing the screwing part and the screwed part, thereby A printing apparatus, wherein the first connecting portion and the second connecting portion are connected in a centered state. A drive shaft for transmitting a rotational drive force to the shaft member;
The printing apparatus according to claim 1, wherein the connecting member is a coupling member that connects the shaft member and the drive shaft. The shaft member is a cylindrical member,
The insertion portion is provided in the connecting member, and the screwed portion is provided in the shaft member,
The printing apparatus according to claim 1, wherein the shaft device includes a fastened member that is attached to the shaft member so that the screwed portion can be disposed in a cylinder of the shaft member.   The shaft device guides the first connecting portion and the second connecting portion to a centered state in a process in which the first connecting portion and the second connecting portion approach each other by fastening the fastening member. The printing apparatus according to claim 1, further comprising an ejection guide unit. When the fastening member is a first fastening member,
The said insertion part has a 2nd to-be-threaded part which can be screwed together of the screwing part of the 2nd fastening member larger diameter than the said fastening member. The printing apparatus as described in. A method of manufacturing a shaft device that is provided in a printing apparatus and includes a cylindrical shaft member having a first connecting portion at an end portion and a connecting member having a second connecting portion connectable to the first connecting portion. There,
An insertion step of inserting a fastening member into an insertion portion provided in one of the first connection portion and the second connection portion;
The screw member of the fastening member is screwed into the screwed portion of the fastened member provided on the other of the first connecting portion and the second connecting portion, and the shaft member and the connecting member are connected. A connecting step of connecting the first connecting portion and the second connecting portion to a centered state by approaching;
A first removing step of removing the fastening member from the screwed portion after the connecting step;
A method of manufacturing a shaft device in a printing apparatus, comprising: a second removing step of removing the fastened member from the other of the first connecting portion and the second connecting portion.

Images