JP4752609B2 - Recording device - Google Patents

Description

  The present invention relates to a transport shaft, a manufacturing method thereof, a liquid ejecting apparatus including the transport shaft, and a recording apparatus. More specifically, the present invention relates to a transport shaft used when transporting a recording material, a method of manufacturing the transport shaft, and a liquid ejecting apparatus and a recording apparatus including the transport shaft.

  Some transport mechanisms for transporting a recording object in a liquid ejecting apparatus such as an ink jet recording apparatus include a pair of rollers that rotate with each other. At least one of the pair of rollers is rotationally driven by some driving means and functions as a driving roller. The other roller is mounted so as to be freely rotatable, and functions as a driven roller that rotates in accordance with the rotation of the driving roller or the conveyance of the object to be conveyed.

  In the transport mechanism, a recording material is sandwiched between the driving roller and the driven roller, and the transported material is displaced by the rotation of the driving roller by pressing the transported material against the driving roller by the driven roller. Therefore, the drive roller that directly contributes to the displacement of the conveyed object is hereinafter referred to as a conveyance axis. The transport amount of the transported object depends on the displacement of the peripheral surface of the transport shaft and the slip of the transported object relative thereto. Therefore, in order to accurately control the transport amount of the transported object, it is desirable that the surface of the transport shaft has a high coefficient of friction with respect to the transported object and the two do not slip.

  Examples of the material having a high friction coefficient with respect to the object to be conveyed include elastic materials such as rubber, resin, and elastomer. This type of elastic material is relatively inexpensive and lightweight, and has a sufficiently high coefficient of friction against the object to be conveyed. Further, in a liquid ejecting apparatus or the like, it is not preferable to apply a large pressure to the recording material after the liquid is attached. Even in such a case, the drive roller formed of an elastic material can be used suitably because high friction can be obtained with a low pressure.

  Patent Document 1 below describes a roller-shaped platen having a surface formed of rubber and its mounting structure. This platen is formed by combining a metal shaft and a rubber roller mounted on the outer periphery thereof. With such a structure, it is possible to obtain a roller member that takes advantage of the characteristics of rubber as a high friction material and a metal shaft having high bending rigidity.

  However, it is difficult to mold a highly elastic material while maintaining high dimensional accuracy because of the elasticity of the material itself. For example, even when materials having the same composition are molded using the same mold, the product dimensions inevitably vary due to changes in environmental conditions such as temperature and humidity during molding, differences in material lots, and the like. Moreover, as described in Patent Document 1, when a roller member is manufactured by combining a metal shaft and a rubber roller, deformation generated in the elastic member in the assembly process may remain in the product. For this reason, with the roller-shaped member having the structure described in Patent Document 1, it is difficult to increase the roundness of the outer peripheral surface.

Therefore, for the purpose of improving the roundness of the roller member formed of an elastic material, it has been proposed to perform centerless processing on the roller member. As described in Patent Document 2 below, in centerless processing (centerless polishing), a substantially cylindrical workpiece is supported by the grindstone itself from the outer periphery between cylindrical grinding wheels and adjusting grindstones that are parallel to each other. While polishing. By this processing, an outer peripheral surface having very high roundness can be formed, so that a roller member formed of a highly elastic material can be made into a conveyance shaft having high roundness by centerless processing.
JP 09-120234 A JP 2005-238366 A

  However, when a member in which a metal shaft and an outer peripheral surface made of a highly elastic material are combined as described in Patent Document 1 is centerless polished, the center of the outer peripheral surface formed by the high elastic member and the axis of the metal shaft It does not necessarily match the core. That is, when the undulation of the surface is unevenly distributed in the roller member before the centerless processing, the outer peripheral surface formed by the centerless processing may be formed with respect to the center deviated from the initially assumed axis. . Since such a transport shaft rotates while being supported by a metal shaft, the object to be transported cannot be displaced at a constant transport speed even though the outer peripheral surface has high roundness. Therefore, for example, when used as a recording material transport axis in a liquid ejecting apparatus, the recording quality of the image is lowered.

  Therefore, for the purpose of solving the above-mentioned problem, as a first embodiment of the present invention, a transport shaft that rotates while being in contact with a transported object to displace the transported object has a circumferential surface that contacts the transported object. Non-elasticity having an elastic part and a circumferential surface that is arranged with the elastic part sandwiched in the direction of the axis of rotation and is formed around the same rotational axis as the circumferential surface of the elastic part and rotates together with the elastic part And a conveyance shaft that is pivotally supported by the non-elastic portion. Thereby, it has the elastic part which has a high roundness while being formed by a highly elastic member, and the non-elastic part which has a center which coincides with the center of the outer peripheral surface of the elastic part and can be pivotally supported without deformation A transport axis is provided. Therefore, even a smooth object to be slipped with a rigid conveying shaft can be accurately conveyed.

  According to one embodiment, the conveying shaft further includes a reinforcing member having a high bending rigidity, which is inserted in the elastic portion and the inelastic portion in the direction of the rotation axis. Thereby, deterioration of the conveyance accuracy due to bending deformation of the conveyance shaft is also prevented.

  According to another embodiment, the central axis in the longitudinal direction of the reinforcing member is shifted from the rotation axis in the transport shaft. Thus, the reinforcing member only needs to compensate for the bending rigidity of the conveyance shaft, and there is no limitation on the shape, arrangement, or the like. Therefore, a conveyance shaft having a high bending rigidity can be obtained inexpensively and easily.

  According to another embodiment, the reinforcing member is formed of hard resin or metal in the transport shaft. Thereby, an appropriate material can be arbitrarily selected in consideration of each function for the conveyance axis recording elastic part and the non-elastic part.

  According to another embodiment, the elastic portion is formed of rubber or elastomer on the transport shaft. Accordingly, it is possible to provide a conveyance shaft that is inexpensive and lightweight and has a high coefficient of friction with respect to the object to be conveyed.

  According to another embodiment, the inelastic portion is formed of a hard resin in the transport shaft. Thereby, the inelastic part which does not deform | transform even if it is axially supported can be formed inexpensively and easily.

  According to another embodiment, in the conveyance shaft, the non-elastic portion and the reinforcing member are members integrally formed of a non-elastic material, and the elastic portion has a cylindrical elasticity mounted on the surface of the reinforcing member. It may be a member formed of a material. Thereby, while reducing the number of parts of the whole conveyance axis | shaft, the high quality conveyance axis | shaft which can perform precise conveyance control can be manufactured.

  According to another embodiment, the outer diameters of the elastic part and the non-elastic part are substantially equal in the transport shaft. As a result, it is possible to mark and form the elastic part and the non-elastic part having the same axial center by one centerless polishing.

  According to another embodiment, in the conveying shaft, the inelastic part integrally includes a driven part to which a rotational driving force is transmitted from an external driving unit. Thereby, the conveyance axis | shaft which contact | abuts to a to-be-conveyed object via an elastic material and can convey correctly is provided.

  According to another embodiment, in the transport shaft, the elastic part includes a plurality of elastic parts having circumferential surfaces formed around a common rotation axis between the pair of inelastic parts. Thereby, the material cost can be saved and a lightweight conveying shaft can be formed.

  Further, as a second embodiment of the present invention, an elastic part having a circumferential surface that rotates around one rotation axis, and an elastic part in the direction of the rotation axis are arranged with the elastic part in between, and is common to the circumferential surface of the elastic part And a non-elastic portion having a circumferential surface that is formed coaxially around the rotation axis and has a circumferential surface that rotates together with the elastic portion, and is in contact with the material to be conveyed on the circumferential surface of the elastic portion. A manufacturing method for manufacturing a conveying shaft that is displaced in the direction of a tangent to a circumferential surface, and having a substantially cylindrical elastic part and a substantially cylindrical inelastic part arranged with the elastic part interposed therebetween On the other hand, the manufacturing method including the process of lumplessly centering the peripheral surfaces of the elastic part and the non-elastic part is provided. Thereby, it has the elastic part which has a high roundness while being formed by a highly elastic member, and the non-elastic part which has a center which coincides with the center of the outer peripheral surface of the elastic part and can be pivotally supported without deformation The transport shaft can be reliably manufactured.

  Further, as one embodiment, in the above manufacturing method, centerless polishing is performed in the preform so that the diameter of the elastic portion is larger than the diameter of the inelastic portion and the diameters of the elastic portion and the inelastic portion are substantially equal. To do. Thereby, since the elastic part with relatively high workability can be processed so as to match the non-elastic part with relatively high molding accuracy, the processing amount is reduced, and the manufacturing time and material cost can be reduced.

  Further, as a third aspect of the present invention, in a reciprocating movement direction that intersects the transport direction at a transport unit that transports the recording material in a predetermined transport direction and a position facing the recording material transported to the transport unit. A liquid ejecting apparatus that includes a liquid ejecting head that ejects liquid while reciprocating, and that forms an image by ejecting liquid onto the surface of the recording material, and rotates the recording material while contacting the recording material. An elastic part having a circumferential surface to be displaced and an elastic part sandwiched in a direction parallel to the axis of rotation, are formed coaxially around the rotation surface common to the circumferential surface of the elastic part and together with the elastic part Provided is a liquid ejecting apparatus that is integrally provided with a non-elastic portion having a rotating circumferential surface, and that includes a conveyance shaft that is pivotally supported by the non-elastic portion. As a result, a liquid ejecting apparatus capable of transporting the recording material by the elastic portion of the transport shaft is formed. Therefore, the recording material having a smooth surface can be accurately conveyed and the surface of the recording material is not deteriorated.

  Furthermore, as a fourth embodiment of the present invention. A transport unit that transports a recording material in a predetermined transport direction; and a recording head that ejects ink while reciprocating in a reciprocation direction intersecting the transport direction at a position facing the recording material transported to the transport unit. A recording apparatus that forms an image by ejecting ink onto the surface of the recording material, the elastic portion having a circumferential surface that rotates to displace the recording material while being in contact with the recording material, A non-elastic part that is arranged around the elastic part in a direction parallel to the axis and that is formed around the common rotational axis and the circumferential part of the elastic part and has a circumferential surface that rotates together with the elastic part. In addition, a recording apparatus is provided in which the transport unit includes a transport shaft that is pivotally supported by the inelastic portion. Thereby, also in a recording device, the above effects can be enjoyed.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 is a perspective view illustrating an overview of an ink jet recording apparatus 100 that is an example of a liquid ejecting apparatus including a transport device. As shown in the figure, the ink jet recording apparatus 100 includes a lower case 110 that forms the base of the entire apparatus, an upper case 112 that forms a casing together with the lower case 110, and a paper that is attached to the rear part of the lower case 110. A support 120 and a discharge tray 130 formed on the front surface of the lower case 110 are provided. Further, the ink jet recording apparatus 100 includes a platen 140 disposed horizontally in the lower case 110, a transport unit 150 disposed behind the platen 140, and a discharge unit 160 disposed in front of the platen 140. Prepare inside. Further, a carriage 170 is disposed above the platen 140.

  In the ink jet recording apparatus 100 as described above, the recording paper 180 accommodated in the paper support 120 is sent one by one onto the platen 140 by the transport unit 150 and is sent out to the discharge tray 130 by the discharge unit 160. A carriage 170 driven by a carriage motor 174 (not shown) reciprocates above the platen 140 in a direction perpendicular to the conveyance direction of the recording paper 180. Therefore, the entire upper surface of the recording paper 180 can be scanned by the carriage 170 by alternately carrying the recording paper 180 and reciprocating the carriage 170. Further, the carriage 170 includes a recording head 172 (shown in FIG. 2) as a liquid ejecting head on the lower surface thereof, and can eject ink to adhere to an arbitrary region on the upper surface of the recording paper 180.

  FIG. 2 is a perspective view showing the internal mechanism 200 of the ink jet recording apparatus 100. In this figure, structural components such as a frame are removed, and functional components involved in the conveyance of the recording paper 180 are drawn.

  A feeding unit including a feeding roller 210 and a feeding driven roller 212 is formed near the lower end of the paper support 120. The feeding unit has a function of taking a plurality of recording sheets 180 loaded in the paper support 120 one by one into the ink jet recording apparatus 100.

  A transport unit 150 including a transport driving roller 220 and a transport driven roller 222 is formed in front of the feeding unit. The conveyance drive roller 220 is rotationally driven by a motor via a rotation transmission mechanism (not shown). On the other hand, the conveyance driven roller 222 is pressed against the conveyance driving roller 220 by an urging means (not shown) and is rotated along with the rotation of the conveyance driving roller 220.

  In addition, a discharge unit 160 including a discharge driving roller 230 and a discharge driven roller 232 is formed in front of the platen 140. The discharge drive roller 230 is also rotationally driven via a rotation transmission mechanism (not shown). Further, the discharge driven roller 232 contacts the discharge drive roller 230 and is rotated along with the rotation. The discharge drive roller 230 includes a single shaft portion 231 having a length extending over the entire length, and a plurality of contact portions 233 attached to the shaft portion 231. Near both ends of the discharge drive roller 230, curlers 235 having the same diameter as the contact portion 233 and made of a hard resin material are mounted. The discharge driven roller 232 is formed by a plurality of rollers respectively corresponding to the contact portions 233 of the discharge drive roller 230.

  Furthermore, the internal mechanism 200 includes a carriage 170 disposed above the platen 140. The carriage 170 can reciprocate in the length direction of the platen 140. A recording head 172 is mounted below the carriage 170 and can eject ink onto the recording paper 180 on the platen 140.

  FIG. 3 is a diagram showing the conveyance path 250 of the recording paper 180 in the ink jet recording apparatus 100 from the side. As shown in the drawing, the recording paper 180 loaded on the paper support 120 is introduced into the conveyance path 250 and fed into the conveyance unit 150 according to the rotation of the feeding roller 210. In the conveyance unit 150, the recording paper 180 is pressed toward the conveyance driving roller 220 by the conveyance driven roller 222 and is fed onto the platen 140 according to the rotation of the conveyance driving roller 220. A recording head 172 mounted on the carriage 170 is disposed above the platen 140 and ejects ink downward. Accordingly, an ink image is formed on the recording paper 180 when passing over the platen 140. Eventually, the recording paper 180 passing over the platen 140 reaches the discharge unit 160. In the discharge unit 160, the recording paper 180 is pressed against the discharge drive roller 230 by the discharge driven roller 232. Accordingly, the ink is fed out of the ink jet recording apparatus 100 according to the rotation of the discharge driving roller 230.

  The carriage 170 is supported and guided by the frame 102 which is a part of the structural material of the internal mechanism 200, and reciprocates in the longitudinal direction of the platen 140. Therefore, by combining the conveyance and discharge of the recording paper 180 and the reciprocating movement of the carriage 170, ink can be ejected toward an arbitrary area on the upper surface of the recording paper 180 to form an image.

  In the transport path 250 as described above, the recording paper 180 taken from the paper support 120 is initially transported according to the rotation of the transport driving roller 220. When the leading edge eventually reaches the discharge unit 160, the recording paper 180 is transported by both the transport drive roller 220 and the discharge drive roller 230. When the paper further advances and the trailing edge passes the conveyance unit 150, the recording paper 180 is conveyed by the discharge driving roller 230.

  FIG. 4 is an enlarged view showing the discharge unit 160 in the transport path 250 as described above. As described above, an image is formed on the surface of the recording paper 180 by ejecting ink on the platen 140. Accordingly, an image has already been formed on the upper surface of the recording paper 180 that has reached the discharge section 160, and the discharge driven roller 232 contacts the surface on which the image is formed. On the other hand, as shown in FIG. 4, the discharge driven roller 232 has a plurality of radially formed protrusions and contacts the recording paper 180 at its sharp tip. Thereby, the contact area with respect to the recording paper 180 is made very small so that the image on the recording paper 180 is not damaged.

  However, the discharge driven roller 232 having the above shape cannot apply a large pressure to the recording paper 180. Therefore, at least the surface of the discharge drive roller 230 is formed of a highly elastic material such as rubber or elastomer so that a high frictional force against the recording paper 180 can be obtained with a small contact pressure. At the same time, the discharge driving roller 230 preferably has high bending rigidity. Therefore, a shaft portion 231 that is formed of a hard material such as metal and extends over the entire length, and a plurality of contact portions 233 that are mounted around the shaft portion 231 are provided. As a result, a conveyance shaft having a high friction coefficient is formed on the recording paper 180 with little bending deformation as a whole. Therefore, a high-quality image can be formed by controlling the conveyance amount with high accuracy even at the rear end portion of the recording paper 180 that passes through the conveyance unit 150 and is conveyed by the discharge unit 160.

  FIG. 5 is a diagram schematically illustrating a mounting structure of the discharge driving roller 230 in the discharge unit 160. As shown in the figure, the discharge drive roller 230 is composed of a metal shaft portion 231 extending over the entire length, a plurality of rubber contact portions 233 attached in the middle of the shaft portion 231, and a contact portion 233. A pair of curlers 235 and 236 attached to the shaft portion 231 on the outside is provided. One curler 236 is provided with a drive gear 237 that rotates integrally with the shaft portion 231.

  Further, the discharge driving roller 230 as described above is pivotally supported from the frame 102 which is a structural material of the ink jet recording apparatus 100 via the curlers 235 and 236. Note that a bush 116 is attached to the frame 102 to reduce friction against the curlers 235 and 236. Further, both the curler 235 and the bush 116 are formed of resin parts that are less deformed and have high lubricity. Such a discharge driving roller 230 rotates smoothly with respect to the frame 102 by being driven to rotate through the driving gear 237.

  Here, the contact portion 233 and the curler 235 of the discharge drive roller 230 have substantially the same outer diameter. The roundness of each outer peripheral surface of the contact portion 233 and the curler 235 can be increased by collectively processing the contact portion 233 and the curler 235 by centerless polishing. Moreover, the contact part 233 and the curlers 235 and 236 have a common central axis by carrying out centerless processing collectively. Therefore, the center of the outer peripheral surface of the contact portion 233 and the center of rotation coincide with each other by being pivotally supported by the curlers 235 and 236. Accordingly, the conveyance amount of the recording paper 180 conveyed by the contact portion 233 is also constant.

  In the discharge drive roller 230, the center of the shaft portion 231 does not always coincide with the centers of the contact portion 233 and the curlers 235 and 236. However, the shaft portion 231 merely supplements the bending rigidity of the discharge drive roller 230 and is not a member that defines the center of rotation of the discharge drive roller 230 as a whole. Therefore, the shift of the center of the shaft portion 231 does not affect the stability of the conveyance amount.

  FIG. 6 is a cross-sectional view showing the structure of the discharge drive roller 230 alone shown in FIG. As shown in the figure, the discharge driving roller 230 includes a shaft portion 231 extending over the entire length, curlers 235 and 236 attached to both ends of the shaft portion 231, and a plurality of contact rollers attached between the curlers 235 and 236. A contact portion 233. One curler 236 is equipped with a gear 237. The shaft portion 231, the curlers 235 and 236 abutment portions 233 and the gear 237 are coupled to each other and rotate integrally as a whole. Moreover, since the shaft part 231 is formed of a highly rigid material such as metal, it has a high bending strength as a whole.

  FIG. 7 is a view showing another form of the discharge drive roller 230. As shown in the figure, the discharge drive roller 230 is integrally formed with a contact portion 233. Thereby, the number of parts can be reduced and the productivity can be improved. Functionally, it is the same as the discharge drive roller 230 shown in FIGS.

  FIG. 8 is a diagram showing the shape of the preform 240 when the discharge drive roller 230 shown in FIG. 7 is manufactured. As shown in the figure, the outer diameter of the contact portion 233 is larger than the outer diameter of the curler 235 at the stage of the preformed product 240. In general, the elastic material forming the contact portion 233 has higher workability than the hard material used as the curler 235. Further, at the stage of the preformed product 240, the hard material that becomes the curler 235 has higher molding accuracy than the high elastic material that becomes the contact portion 233, and has a higher roundness than the original. Therefore, as shown in FIG. 8, the contact portion 233 can efficiently manufacture the discharge drive roller 230 having a high roundness and less run-out during rotation by centerless polishing the preform 240 having a larger diameter. .

  FIG. 9 is a view showing one cross-sectional structure of the discharge drive roller 230 shown in FIG. As shown in the figure, in the discharge driving roller 230, the shaft portion 231 and the curler 235 are integrally formed. Thereby, the number of parts concerning the discharge drive roller 230 can be reduced, and the manufacturing cost and the assembly cost can be reduced.

  FIG. 10 is a view showing another cross-sectional structure of the discharge drive roller 230 shown in FIG. This discharge drive roller 230 is not different from the discharge drive roller 230 shown in FIGS. 7 and 8 in appearance. However, the reinforcing member 238 is inserted through the entire length thereof. As long as the reinforcing member 238 has a desired bending strength, the material and the shape need not be considered. Therefore, the discharge driving roller 230 having a high bending rigidity can be manufactured at a low cost by using an easily available material.

  FIG. 11 is a view showing still another cross-sectional structure of the discharge drive roller 230 shown in FIG. As shown in the drawing, in the discharge driving roller 230, a hollow tube material is used as the reinforcing member 238. As a result, it is possible to form the discharge drive roller 230 that is lightweight but has sufficient bending rigidity.

  The discharge driving roller 230 having the above-described structure does not cause the outer peripheral surface to be shaken due to the rotation even though the outer peripheral surface is formed of an elastic material. Therefore, in the ink jet recording apparatus 100, even during a period in which the recording paper 180 passes through the transport unit 150 and is transported by the discharge unit 160, the transport amount of the recording paper 180 can be accurately controlled, and print quality is not deteriorated. .

  Further, the structure of the discharge driving roller 230 is not limited to the discharge driving roller 230 of the ink jet recording apparatus 100, and can be used for many devices that handle a sheet-like conveyed object on the surface formed of an elastic material. Specifically, the present invention can be widely applied to facilities that are required to accurately transport thin objects to be transported, such as film scanners and semiconductor device mounting lines.

  The technical scope of the present invention is not limited to the scope described in the above embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a perspective view illustrating an overall structure of an inkjet recording apparatus 100. FIG. 2 is a perspective view showing an internal mechanism 200 extracted from the ink jet recording apparatus 100. FIG. 3 is a cross-sectional view illustrating a recording material conveyance path 250 in the inkjet recording apparatus 100. FIG. 6 is a diagram illustrating conveyance of the recording paper 180 by a discharge driving roller 230 and a discharge driven roller 232 in the discharge unit 160. FIG. It is a figure which shows typically the shaft support structure of the discharge drive roller 230 in the discharge part 160. FIG. It is sectional drawing which shows the structure of the discharge drive roller 230 of the discharge part 160 shown in FIG. FIG. 6 is a view showing another form of the discharge drive roller 230. It is a figure which shows the shape of the preformed product 240 in the case of manufacturing the discharge drive roller 230 shown in FIG. FIG. 8 is a diagram illustrating a cross-sectional structure of the discharge driving roller 230 illustrated in FIG. 7. FIG. 8 is a diagram illustrating another cross-sectional structure of the discharge driving roller 230 illustrated in FIG. 7. FIG. 9 is a view showing still another cross-sectional structure of the discharge driving roller 230 shown in FIG. 7.

Explanation of symbols

100 Inkjet recording apparatus, 102 frame, 110 lower case, 112 upper case, 120 paper support, 130 discharge tray, 140 platen, 150 transport unit, 160 discharge unit, 170 carriage, 172 recording head, 174 carriage motor, 180 recording paper , 200 Internal mechanism, 210 Feed roller, 212 Feed driven roller, 220 Transport drive roller, 222 Transport driven roller, 230 Discharge drive roller, 231 Shaft portion, 232 Discharge follower roller, 233 Contact portion, 240 Preliminary product, 235, 236 curler, 250 transport path

Claims (6)

A transport unit for transporting the recording material in a predetermined transport direction;
A recording head that ejects ink while reciprocating in a reciprocating movement direction intersecting the conveying direction at a position facing the recording material conveyed to the conveying unit;
A recording apparatus for forming an image by ejecting ink onto the surface of the recording material,
An elastic portion having a circumferential surface that rotates while being in contact with the recording material to displace the recording material ;
The elastic part is arranged in a direction parallel to the axis of rotation, has the same diameter as the elastic part, and is formed coaxially around a rotation axis common to the circumferential surface of the elastic part. And a non-elastic portion having a circumferential surface that rotates together with the elastic portion. The recording device includes a conveyance shaft that is pivotally supported by the non-elastic portion. The recording apparatus according to claim 1, wherein the conveyance shaft further includes a reinforcing member having high bending rigidity that is inserted through the elastic portion and the inelastic portion in the direction of the rotation shaft. The recording apparatus according to claim 2, wherein a central axis in a longitudinal direction of the reinforcing member is deviated from the rotation axis. The non-elastic portion and the reinforcing member are members integrally formed of a non-elastic material, and the elastic portion is a member formed of a cylindrical elastic material mounted on the surface of the reinforcing member. Item 4. The recording apparatus according to Item 2 or Item 3 . The inelastic part, the recording apparatus according to any one of the driven part which is transmitting the driving force of the rotation from the outside of the drive means from claim 1, further comprising integral to claim 4. The elastic part, between the pair of the non-elastic portion, one of claims 1 including a plurality of resilient portions having a circumferential surface formed around a common mutual rotation axis to claim 5 1 The recording device according to item.

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