JP2006069734A - Manufacturing method for conveyance driving roller,conveyance driving roller, and recording device equipped with the conveyance driving roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a conveyance driving roller capable of easily manufacturing the conveyance driving roller having a central supporting part where a high friction resistance film is not formed, in a condition of highly accurately uniformized outer diameter of a peripheral surface formed with the high friction resistance film, without increasing the the number of manufacturing processes. <P>SOLUTION: Two reduced-diameter parts 401 with their diameters approximately concentrically reduced by a predetermined difference of outer diameters at an approximately constant width are provided near both outsides of a part to be the central supporting part 413 for manufacturing a shaft body 40 (a: shaft body manufacturing process). A masking tape MT is winded around an outer peripheral surface of a region sandwiched by the two reduced-diameter parts 401 including the part to be the central supporting part 413 of the shaft body 40 (b: masking process). A high friction resistance film coating S is uniformly provided at a predetermined film thickness on an outer peripheral surface of a region of the shaft body 40 to be formed with the high friction resistance film including the masking processed part (c: high friction resistance film forming process). The masking tape MT is removed (d: masking tape removing process). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a high friction resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the center support portion of the cylindrical body, and is supported rotatably at both end support portions and the center support portion. The rotational driving force from the driving force source is transmitted and rotated, so that the object to be transported is in contact with the outer peripheral surface and is in close contact with the outer peripheral surface by the frictional resistance of the high frictional resistance coating. The present invention relates to a conveyance drive roller, a recording apparatus including the conveyance drive roller, and a method for manufacturing the conveyance drive roller.

  For example, in a recording apparatus such as an ink jet printer, a conveying means for conveying a recording material such as recording paper in a predetermined conveying direction with a predetermined conveying amount with high accuracy is provided on the outer peripheral surface of a cylindrical shaft body. In general, there is provided a conveyance drive roller having a high frictional resistance film formed on the outer peripheral surface by a process such as attaching ceramic powder to the applied paint. The conveyance driving roller is supported by the main body frame of the recording apparatus so as to be rotatable in the conveyance direction, and is rotated by a rotational driving force transmitted by a rotational driving force source such as a motor, thereby rotating the outer periphery due to the frictional resistance of the high frictional resistance film. The recording material in close contact with the surface is conveyed in the rotation direction (see, for example, Patent Document 1). Since the conveyance accuracy of the recording material directly affects the recording image quality of the recording apparatus, extremely high accuracy is required for the conveyance amount and the inclination of the conveyance direction in the conveyance unit of the recording apparatus. For this reason, the shaft body constituting the transport driving roller is generally formed of a material having high rigidity and being difficult to bend.

  In such a recording apparatus, it is necessary to dispose a transport driving roller having a length corresponding to the maximum size of the recording material capable of recording (a length sufficiently longer than the lateral width of the maximum size recording material). Although the outer diameter remains the same, the longer the length, the easier it is to bend. For this reason, the amount of bending of the transport drive roller caused by the weight of the transport drive roller or the pressing force when the recording material is brought into close contact with the outer peripheral surface of the transport drive roller increases. Accordingly, in a state where the transport driving roller is rotatably supported only at both ends, a decrease in transport accuracy due to the bending of the transport driving roller becomes a problem. Therefore, in order to solve such a problem, there is provided a recording apparatus configured to rotatably support the transport driving roller in the vicinity of both ends and further support the transport driving roller in the vicinity of the center of the transport driving roller. It is known (see, for example, Patent Document 2). In the vicinity of the center of the transport drive roller, the bend of the transport drive roller is restricted, thereby reducing the transport error caused by the bend of the transport drive roller described above. Reduction can be reduced.

  By the way, when the transport driving roller is rotatably supported, if a high frictional resistance film is formed on the rotatably supported portion, a large rotational resistance is generated at the support portion. The load of the driving force source to rotate will become large. Therefore, in general, a high frictional resistance film is not formed in the vicinity of both end portions of the transport driving roller that is rotatably supported. That is, the rotational frictional resistance at the supporting portions near both ends and near the center of the transport driving roller can be reduced by supporting the shaft body with low frictional resistance so as to be rotatable. Therefore, in the case where the conveyance drive roller is rotatably supported in the vicinity of both ends of the conveyance drive roller as described above, a high frictional resistance film is also formed in the vicinity of the center of the conveyance drive roller. It is necessary to provide a part that is not. The transport driving roller having such a central support portion is formed by masking the central support portion with a masking tape or the like in advance so that a high frictional resistance film is not formed on the central support portion in the manufacturing process. It is usual to form a high frictional resistance film on the whole. By forming a high frictional resistance film on the entire outer peripheral surface of the masked shaft body and then removing the masking, it is possible to manufacture a transport drive roller in which the high frictional resistance film is not formed on the central support portion of the shaft body. it can.

  Since the high frictional resistance film is not formed on this central support part, the outer diameter is reduced by the film thickness of the high frictional resistance film, so the central support part and the area where the high frictional resistance film is formed A slight level difference corresponding to the film thickness occurs at the boundary portion. For this reason, when a recording material such as recording paper is pressed and brought into close contact with the outer peripheral surface of the conveyance driving roller, the recording material may be slightly deformed by the step portion, thereby causing a conveyance error, a gradient in the conveyance direction, or the like. There is. As an example of a known technique for solving such a problem, a plurality of driven rollers arranged on the outer peripheral surface of the conveying drive roller so as to press the recording material against the outer peripheral surface of the conveying drive roller are arranged on the driven roller. There is a known recording apparatus in which the roller surface is disposed so as to straddle the step portion of the center support portion (the boundary portion between the center support portion and the region where the high frictional resistance film is formed) (see, for example, Patent Document 2). . Accordingly, the recording material is prevented from being pressed into the level difference of the central support portion, and the recording material conveyance error and the inclination in the conveyance direction due to the recording material are prevented.

JP 2001-158545 A JP 2001-233493 A

  However, in the manufacturing process of the conveyance drive roller described above, after the high frictional resistance film is formed on the shaft body in the state where the central support part is masked, if the masking is removed, the central support part and the high frictional resistance film are formed. The film pressure at the boundary with the region is slightly thick, and the outer diameter of the high frictional resistance film surface at that part is slightly increased. That is, the high frictional resistance coating surface at the boundary between the portions masked by masking tape or the like became extremely small (about several μm), and the outer diameter of the outer peripheral surface of the transport driving roller was partially increased slightly. In such a state, a high frictional resistance film is formed. The presence of a portion having a slightly larger outer diameter on the outer peripheral surface (high frictional resistance coating surface) of the transport driving roller causes a slight transport error of the recording material, a tilt in the transport direction, and the like. Such a transport error, a tilt in the transport direction, and the like are very slight, and the deterioration of the recording image due to the transport error has hardly been regarded as a problem in the past.

  However, in recent years, recording devices such as ink jet printers have been dramatically improved in image quality, and a transport error, a tilt in a transport direction, etc., which have hardly been regarded as problems in the past, are becoming ignorable. For this reason, a transport error, a tilt in the transport direction, and the like caused by a portion where the high frictional resistance coating surface formed in the manufacturing process as described above is extremely small and raised cannot be ignored. Therefore, for example, after forming a high frictional resistance film, a solution such as scraping and flattening the raised portion can be considered. However, there is a need for a new manufacturing process, a processing device, a tool, and the like for scraping the outer peripheral surface of the slightly raised portion of the transport driving roller, and the manufacturing cost of the transport driving roller is significantly increased accordingly. Occurs. Also, the process of scraping off the raised portion is a manual operation, so the work efficiency is poor, and the high frictional resistance film is accidentally damaged, which causes a decrease in the conveyance accuracy by the conveyance drive roller. There is a risk that it will end.

  The present invention has been made in view of such a situation, and the problem is that a conveyance drive roller having a central support portion on which a high frictional resistance film is not formed is used as an outer periphery on which a high frictional resistance film is formed. It is an object of the present invention to provide a method for manufacturing a transport drive roller that can be easily manufactured without increasing the number of manufacturing steps in a state where the outer diameter of the surface is made uniform with high accuracy.

  In order to achieve the above object, according to a first aspect of the present invention, a high frictional resistance film is formed with a uniform film thickness on an outer peripheral surface excluding both end support portions and a center support portion of a cylindrical body, The support body and the central support part are rotatably supported, and the rotational driving force from the driving force source is transmitted to rotate, thereby rotating the transported body in close contact with the outer peripheral surface of the high frictional resistance coating. A method of manufacturing a transport drive roller for transporting to a region, wherein a series of regions including a portion serving as the central support portion and both outer sides of the portion serving as the central support portion are concentrically reduced in diameter with a predetermined outer diameter difference. A shaft body manufacturing process for manufacturing the shaft body having a curved shape, and masking of an outer peripheral surface of a portion to be the central support portion of the shaft body before forming a high frictional resistance film on the outer peripheral surface of the shaft body Masking step and the masking step A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body, and a masking removal step of removing masking after the high friction resistance film formation step, This is a method of manufacturing a transport drive roller.

  First, a cylindrical shaft body having a shape in which a series of regions including a portion serving as a central support portion and both outer sides of the portion serving as a central support portion are concentrically reduced with a predetermined outer diameter difference is formed on the conveyance drive roller. Manufactured as a shaft serving as a base. Subsequently, before forming the high frictional resistance film on the outer peripheral surface of the shaft body, in order to prevent the high frictional resistance film from being formed on the center support portion, the center of the shaft body is wound by means such as wrapping a masking tape. Mask the outer peripheral surface of the part to be the support part. The shaft body that is the base of the conveyance drive roller has a central support portion because a series of regions including the outer portion of the portion that becomes the central support portion and the portion that becomes the central support portion are concentrically reduced in diameter by a predetermined outer diameter difference. When the outer peripheral surface of the portion is masked, the boundary between the masked portion and the unmasked portion is located in the reduced diameter portion in the vicinity of both outer sides of the portion serving as the central support portion. In this state, after forming the high frictional resistance film on the outer peripheral surface of the shaft body, if the masking is removed, the boundary part between the masked part and the unmasked part (on the central support part side of the high frictional resistance film) The portion where the high frictional resistance coating surface formed at the end of the substrate is extremely small (several μm) is formed in the reduced diameter portion in the vicinity of both outer sides of the central support portion. Will be.

  The reduced diameter portion of the shaft body is concentrically reduced with a predetermined outer diameter difference. Therefore, due to the predetermined difference in outer diameter, the outer diameter of the raised portion is made smaller than the outer diameter of the portion where the high frictional resistance film is formed in the non-reduced region. it can. Accordingly, it is possible to prevent the high frictional resistance film from being formed in a state where the outer diameter of the outer peripheral surface of the transport driving roller is partially increased in the masked portion. In addition, by reducing the diameter of the portion serving as the center support portion concentrically with the shaft body, it is possible to prevent the conveyance drive roller from rotating eccentrically when the conveyance drive roller is rotatably supported.

Therefore, according to the manufacturing method of the conveyance drive roller described in the first aspect of the present invention, the conveyance drive roller having the central support portion on which the high frictional resistance film is not formed is formed with the high frictional resistance film. In the state in which the outer diameter of the outer peripheral surface is made uniform with high accuracy, it is possible to obtain an effect that it can be easily manufactured without increasing the manufacturing process.
The predetermined outer diameter difference may be an outer diameter difference that is larger than the height of the portion where the high frictional resistance coating surface is extremely small (about several μm) and is in a raised state. It is preferable to provide a sufficiently large outer diameter difference in consideration of height variation and the like.

  In a second aspect of the present invention, a high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the center support portion of the cylindrical body, and the both end support portions and the center support portion are formed. In order to convey the object to be conveyed that is in close contact with the outer peripheral surface of the high frictional resistance coating by rotating and receiving the rotational driving force transmitted by the driving force source in the rotational direction. A method of manufacturing a roller, wherein the shaft body having a shape having two reduced-diameter portions that are substantially concentric and have a predetermined outer diameter difference in the vicinity of both outer sides of the portion that becomes the central support portion. A shaft body manufacturing process to be manufactured, and a region sandwiched between two reduced diameter portions including a portion to be the central support portion of the shaft body before forming a high frictional resistance coating on the outer peripheral surface of the shaft body. Masking process for masking the outer peripheral surface, and after the masking process A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body, and a masking removal step of removing masking after the high friction resistance film formation step. This is a method for manufacturing a transport drive roller.

  First, a shaft serving as a base for a transport drive roller is formed of a shaft body having two reduced-diameter portions whose diameters are concentrically reduced by a predetermined outer diameter difference between both outer sides of a portion that becomes a central support portion. Manufactured as a body. Subsequently, before forming the high frictional resistance film on the outer peripheral surface of the shaft body, in order to prevent the high frictional resistance film from being formed on the center support portion, the center of the shaft body is wound by means such as wrapping a masking tape. Masking is performed on the outer peripheral surface of the region sandwiched between the two reduced-diameter portions including the support portion. As a result, the boundary portions between the masked portion and the unmasked portion when masked are located at the two reduced diameter portions, respectively. In this state, after forming the high frictional resistance film on the outer peripheral surface of the shaft body, if the masking is removed, the boundary part between the masked part and the unmasked part (on the central support part side of the high frictional resistance film) The portion where the high frictional resistance coating surface formed on the end portion of (2) is extremely small (about several μm) is formed in two reduced diameter portions.

  The two reduced diameter portions are reduced substantially concentrically with a predetermined outer diameter difference. Therefore, due to the predetermined difference in outer diameter, the outer diameter of the raised portion is made smaller than the outer diameter of the portion where the high frictional resistance film is formed in the non-reduced region. it can. Accordingly, it is possible to prevent the high frictional resistance film from being formed in a state where the outer diameter of the outer peripheral surface of the transport driving roller is partially increased in the masked portion. In addition, since the diameter of the portion that becomes the central support portion is not reduced, and the vicinity of both outer sides of the portion that becomes the central support portion is reduced in diameter, there is no possibility that the central support portion is eccentric with respect to the rotation shaft of the shaft body. Furthermore, since some eccentricity is allowed to occur in the diameter-reduced portion, it is easy to form the diameter-reduced portion in the shaft manufacturing process.

Therefore, according to the method for manufacturing the conveyance drive roller described in the second aspect of the present invention, the conveyance drive roller having the central support portion on which the high frictional resistance film is not formed is formed with the high frictional resistance film. In the state in which the outer diameter of the outer peripheral surface is made uniform with high accuracy, it is possible to obtain an effect that it can be easily manufactured without increasing the manufacturing process.
The predetermined outer diameter difference may be an outer diameter difference that is larger than the height of the portion where the high frictional resistance coating surface is extremely small (about several μm) and is in a raised state. It is preferable to provide a sufficiently large outer diameter difference in consideration of height variations and eccentricity of the reduced diameter portion.

  According to a third aspect of the present invention, in the first aspect or the second aspect described above, the masking step includes a step of masking the both end support portions of the shaft body. It is a manufacturing method. In this way, by forming the high frictional resistance film after masking both end support parts, it is also possible to form the both end support parts where the high frictional resistance film is not formed.

  According to a fourth aspect of the present invention, there is provided the shaft body according to any one of the first to third aspects, wherein the outer peripheral length of the region where the high frictional resistance film is formed is a predetermined outer peripheral length. The outer diameter of the region where the high frictional resistance film is formed and the film thickness of the high frictional resistance film are set. In this way, by manufacturing the transport driving roller so as to have a predetermined outer peripheral length, it becomes possible to accurately detect the transport amount of the transported body due to the rotation amount of the transport driving roller, and a highly accurate transported body. The conveyance control can be realized.

According to a fifth aspect of the present invention, a high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the center support portion of the cylindrical body, and the both end support portions and the center support portion In order to convey the object to be conveyed that is in close contact with the outer peripheral surface of the high frictional resistance coating by rotating and receiving the rotational driving force transmitted by the driving force source in the rotational direction. A shaft, which is a roller and has a shape in which a series of regions including a portion serving as the center support portion and both outer sides of the portion serving as the center support portion are concentrically reduced with a predetermined outer diameter difference, is manufactured. A shaft body manufacturing process, a masking process for masking an outer peripheral surface of a portion to be the center support portion of the shaft body before forming a high frictional resistance film on the outer peripheral surface of the shaft body, and the masking process after the masking process Uniform film thickness on the outer peripheral surface of the shaft A transport drive roller manufactured by a manufacturing process having a high frictional resistance film forming process for forming a high frictional resistance film and a masking removal process for removing masking after the high frictional resistance film forming process. is there.
According to the conveyance drive roller described in the fifth aspect of the present invention, the effect of the invention described in the first aspect described above can be obtained in the conveyance drive roller.

According to a sixth aspect of the present invention, a high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the center support portion of the cylindrical body, and the both end support portions and the center support portion In order to convey the object to be conveyed that is in close contact with the outer peripheral surface of the high frictional resistance coating by rotating and receiving the rotational driving force transmitted by the driving force source in the rotational direction. A shaft for producing the shaft body having a shape having two reduced-diameter portions whose diameters are concentrically reduced with a predetermined outer diameter difference in the vicinity of both outer sides of the portion serving as the central support portion, which is a roller. Before forming a high frictional resistance film on the outer peripheral surface of the shaft body and the body manufacturing process, the outer peripheral surface of the region sandwiched between the two reduced-diameter portions including the central support portion of the shaft body Masking step for masking, and the shaft after the masking step It is manufactured by a manufacturing process having a high frictional resistance film forming step for forming a high frictional resistance film with a uniform film thickness on the outer peripheral surface, and a masking removing step for removing masking after the high frictional resistance film forming step. The conveyance drive roller characterized by the above.
According to the conveyance drive roller described in the sixth aspect of the present invention, the effect of the invention described in the second aspect described above can be obtained in the conveyance drive roller.

According to a seventh aspect of the present invention, in the fifth aspect or the sixth aspect described above, the masking step includes a step of masking the both end support portions of the shaft body. It is.
According to the conveyance drive roller described in the seventh aspect of the present invention, the effect of the invention described in the third aspect described above can be obtained in the conveyance drive roller.

According to an eighth aspect of the present invention, there is provided a recording apparatus that conveys a recording material by a conveying unit that includes the conveyance driving roller according to any one of the fifth to seventh aspects.
According to the recording apparatus described in the eighth aspect of the present invention, in the recording apparatus that transports the recording material by the transport unit including the transport driving roller, any of the above-described fifth to seventh aspects. The operational effects of the described invention can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a schematic configuration of an ink jet recording apparatus as a “recording apparatus” according to the present invention will be described.

  FIG. 1 is an external perspective view of an ink jet recording apparatus according to the present invention. FIG. 2 is a schematic perspective view of the ink jet recording apparatus according to the present invention with the main body cover removed. FIG. 3 is a perspective view of the main part of the internal structure of the ink jet recording apparatus according to the present invention. FIG. 4 is a sectional side view of the main part of the internal structure of the ink jet recording apparatus according to the present invention. FIG. 5 is a perspective view of a main part of the internal structure of the ink jet recording apparatus 100, and shows a state where the post-paper guiding member 45 is removed.

  The ink jet recording apparatus 100 is covered with a main body cover 1 as shown in FIG. 1, and an upper surface cover 2 that can be opened and closed upward is disposed on the upper surface of the main body cover 1. By opening the top cover 2, the user can access the inside of the ink jet recording apparatus 100, and the ink cartridge can be replaced. On the front surface of the main body cover 1, switches 5 such as a power switch are disposed, and a paper discharge stacker 3 and a tray cover 4 are disposed so as to be opened and closed forward. The paper discharge stacker 3 is used in a state of being opened forward at the time of recording execution, and is placed on the paper output stacker 3 in a state where the “recorded material” and the recording paper P as the “conveyed body” after the recording are open. It is discharged and stacked. The tray cover 4 can be accessed forward to a tray insertion slot for a user to manually insert a disc tray from the front while the tray cover 4 is opened forward. The disc tray is used when recording on the label surface of the optical recording disc, and is performed by manually inserting the disc tray with the optical recording disc attached to a predetermined insertion position of the tray insertion slot. Thus, recording on the label surface of the optical recording disk can be executed.

  As shown in the figure, an automatic paper feeder 20 is disposed at the rear of the ink jet recording apparatus 100, and a paper feed tray cover 6 that can be opened and closed upward is disposed above the automatic paper feeder 20. ing. The paper feed tray cover 6 is used in an open state when recording is performed, and recording before recording is performed on the paper feed tray 22 that forms a support surface of the recording paper P integrally with the opened paper feed tray cover 6. The paper P is stacked. The recording sheets P stacked on the sheet feeding tray 22 are pressed against the outer peripheral surface of the sheet feeding roller 21 by a hopper 23 that swings toward the sheet feeding roller 21 at a predetermined timing during sheet feeding. The recording paper P pressed against the outer peripheral surface of the paper feed roller 21 is rotated with the outer peripheral surface of the transport driving roller 41 by the drive rotation of the paper feed roller 21 that is rotatably arranged with the paper feed roller shaft 211 as a rotation axis. The sheets are automatically fed one by one toward the contact surface with the outer peripheral surface of the transport driven roller 42.

  The main body 11, the left side frame 12, the right side frame 13, the right side outer frame 13 a, and the rear frame 19 form a main skeleton of the casing of the ink jet recording apparatus 100. The left side frame 12 (via the member 191), the right side frame 13, and the right side outer frame 13 a are connected by a rear frame 19 on the front side of the ink jet recording apparatus 100. Both end support portions (left end support portion 411 and right end support portion 412) of the transport driving roller 41 are respectively attached to the left side frame 12 and the right side frame 13 so as to be rotatable in the transport direction (sub scanning direction Y) of the recording paper P. It is supported. The left end support portion 411 of the transport driving roller 41 is rotatably supported by the left side frame 12 via the rotating bush 17, and the right end support portion 412 of the transport driving roller 41 is supported by the right side frame 13 via the rotating bush 18. It is rotatably supported.

  Further, the center support portion 413 formed near the center of the transport drive roller 41 is rotatably supported by the intermediate support member 15. The intermediate support member 15 can move the support position of the center support portion 413 up and down by the rotation position of the adjustment member 16 rotatably disposed on the subframe 14. A high frictional resistance film is formed on the outer peripheral surface of the conveyance driving roller 41 except for the central support portion 413 that is rotatably supported by the intermediate support member 15 on the portion where the recording paper P is pressed and adhered. . That is, as shown in the drawing, a high frictional resistance film 41a is formed on the left side and a high frictional resistance film 41b is formed on the right side with the center support portion 413 interposed therebetween.

  Two transport driven rollers 42 are supported on each transport driven roller holder 43 so as to be driven to rotate in the transport direction of the recording paper P. A plurality of transport driven roller holders 43 are arranged in parallel with the transport drive roller 41. The main frame 11 is swingably supported. Each conveyance driven roller holder 43 is pressed and biased to the conveyance driving roller 41 by a spring 431, whereby each conveyance driven roller 42 is pressed against the outer peripheral surface of the conveyance driving roller 41 with a substantially constant pressing force. Yes. In addition, auxiliary roller holders 43S are disposed downstream of each conveyance driven roller holder 43 in the sub-scanning direction Y, and the auxiliary roller 42S is driven and rotated in the conveyance direction of the recording paper P in the auxiliary roller holder 43S. Supported as possible. A high frictional resistance film is uniformly formed on the outer peripheral surface of the transport driving roller 41 except for the vicinity of the left end support portion 411, the right end support portion 412, and the center support portion 413.

  The recording paper P fed from the automatic paper feeder 20 is guided toward the outer peripheral surface of the transport driving roller 41 by the paper guide front member 44, and the outer peripheral surface of the transport driving roller 41 and the transport driven roller 42 come into contact with each other. The conveyance amount corresponding to the rotation amount of the conveyance drive roller 41 is held by the surface and pressed against and closely contacts the high frictional resistance coating surface of the conveyance drive roller 41 and the conveyance drive roller 41 rotates in the sub-scanning direction Y. Is conveyed in the sub-scanning direction Y.

  The conveyance drive roller 41 is integrally attached so that the conveyance gear 54 can transmit rotation, and the drive rotation of the drive pulley 52 of the conveyance motor 51 is transmitted to the conveyance gear 54 via the endless belt 53 and rotates. The recording paper P transported in the sub-scanning direction Y by the rotation of the transport driving roller 41 is transported while its surface posture is regulated while the back surface is in sliding contact with the platen 46 formed integrally with the post-paper guiding member 45. A known rotary encoder is provided on the left end support portion 411 side of the transport driving roller 41 as “rotation amount detecting means” for detecting the rotation amount of the transport driving roller 41. The rotary encoder includes a rotary scale 50 that rotates in conjunction with the rotation of the conveyance drive roller 41, and a rotary scale sensor 501 that detects slits formed at equal intervals along the outer periphery of the rotary scale 50. .

  The ink jet recording apparatus 100 includes a carriage 62 for causing a recording head 63 that performs recording by ejecting ink onto the recording paper P to scan the recording paper P in the main scanning direction X. The carriage 62 is pivotally supported by a carriage guide shaft 61 so as to be reciprocable in the main scanning direction X, and a rotational driving force of a carriage motor (not shown) is transmitted by a belt transmission mechanism (not shown). Reciprocates to X. The carriage guide shaft 61 is disposed with both ends supported by the left side frame 12 and the right side outer frame 13a. An ink cartridge (not shown) filled with ink of each color is detachably mounted on the carriage 62, and ink of each color is supplied from the ink cartridge to the recording head 63. The head surface of the recording head 63 reciprocates in the main scanning direction X at a position facing the platen 46, and ink is ejected from the nozzles arranged on the head surface onto the recording paper P conveyed on the platen 46. Recording is performed.

  The distance between the head surface of the recording head 63 and the recording surface of the recording paper P is defined by the platen 46. The ink jet recording apparatus 100 is provided with a known linear encoder for detecting the movement position of the carriage 62. The linear encoder includes a linear scale 64 disposed in parallel to the carriage guide shaft 61, a linear scale sensor (not shown) that is mounted on the carriage 62 and detects slits formed in the linear scale 64 at equal intervals. have.

  On the other hand, on the downstream side of the platen 46 in the sub-scanning direction Y, as a means for discharging the recording paper P after the recording is performed, a first discharge supported by the post-paper guiding member 45 is rotatably supported in the sub-scanning direction Y. A paper drive roller shaft 47 and a second paper discharge drive roller shaft 48 are provided. As shown in the drawing, a plurality of first paper discharge drive rollers 471 are provided at substantially equal intervals on the first paper discharge drive roller shaft 47, and a plurality of first paper discharge drive roller shafts 48 are similarly provided with a plurality of paper discharge drive roller shafts 48. Second paper discharge drive rollers 481 are provided at substantially equal intervals. The second paper discharge drive roller 481 transmits the rotational driving force of the transport motor 51 to the second paper discharge drive roller shaft 48 via the transport gear 54, the intermediate gear 55, and the paper discharge gear 56, and the discharge direction ( Rotate in the sub-scanning direction Y). The first paper discharge drive roller 471 is connected to the first paper discharge drive roller shaft 47 via a gear 57 that is rotatably attached to the second paper discharge drive roller shaft 48 and an intermediate gear (not shown). The rotational driving force of the conveying motor 51 is transmitted to the gear 58 that is attached so as to be able to transmit the rotation, and rotates in the discharge direction (sub-scanning direction Y).

  A paper discharge frame 49 (FIG. 4) that is long in the main scanning direction X is provided above the first paper discharge drive roller shaft 47 and the second paper discharge drive roller shaft 48. A plurality of first paper discharge driven rollers 472 are supported on the paper discharge frame 49 at positions corresponding to the first paper discharge drive rollers 471 so as to be driven to rotate, and correspond to the second paper discharge drive rollers 481. A plurality of second paper discharge driven rollers 482 are supported so as to be driven to rotate. The first paper discharge driven roller 472 and the second paper discharge driven roller 482 have a plurality of teeth around them and are sharply sharpened so that the tips of the teeth make point contact with the recording surface of the recording paper P. The first discharge roller 471 and the second discharge roller 481 are biased with a weak biasing force. The recording paper P after recording is held between the first paper discharge driving roller 471 and the first paper discharge driven roller 472, and is rotated by the rotation of the first paper discharge driving roller 471 in the discharge direction. The sheet is conveyed and is further sandwiched between the second discharge driving roller 481 and the second discharge driven roller 482 and opened by the rotation of the second discharge driving roller 481 in the discharge direction. Are discharged to the paper discharge stacker 3.

  In the ink jet recording apparatus 100 having such a configuration, first, the blank recording paper P before recording is automatically fed by the automatic paper feeder 20. Subsequently, the automatically fed blank recording paper P before recording is conveyed in the sub-scanning direction Y by a predetermined transport amount while being in sliding contact with the platen 46 facing the head surface of the recording head 63 by the rotation of the transport driving roller 41. The operation of transporting and the operation of ejecting ink from the recording head 63 that reciprocates in the main scanning direction X on the platen 46 are alternately and repeatedly executed to perform recording on the recording surface. Then, the recording paper P after execution of recording is discharged to the paper discharge stacker 3 by the rotation of the first paper discharge drive roller 471 and the second paper discharge drive roller 481 in the discharge direction. A series of these recording execution operations are performed by a recording control device (not shown), an automatic paper feeding motor (not shown) as a driving force source of the automatic paper feeding device 20, a conveying motor 51, and a carriage driving motor ( (Not shown) is controlled and executed.

  Next, a method for manufacturing the transport drive roller 41 having the above-described configuration will be described. FIG. 6 shows a first embodiment of the manufacturing process of the transport drive roller 41 according to the present invention. FIG. 8 shows the prior art of the manufacturing process of the transport driving roller 41 for comparison with the manufacturing process of the transport driving roller 41 according to the present invention.

First, a conventional general manufacturing process of the conveyance drive roller 41 will be described with reference to FIG.
First, a cylindrical metal shaft 40 that is a base of the transport drive roller 41 is manufactured with a predetermined length and shaft diameter (a: shaft body manufacturing step). Subsequently, in order to prevent a high frictional resistance film from being formed on the central support portion 413 of the shaft body 40, a masking process is performed by, for example, winding a masking tape MT around a portion that becomes the central support portion 413 of the shaft body 40 (b). : Masking step). In the conventional manufacturing process of the transport drive roller 41, since the masking area by the masking tape MT becomes the central support portion 413 as it is, it is necessary to wrap the masking tape MT at an accurate position with high accuracy. Subsequently, the high frictional resistance coating S is uniformly applied to the outer peripheral surface of the region of the shaft body 40 where the high frictional resistance coating is to be formed, including the masking part (c: high frictional resistance). Film formation step). Then, after applying the high frictional resistance coating S, the masking tape MT is removed (d: masking removal step). As a result, it is possible to manufacture the center support portion 413 and the transport drive roller 41 on which the high friction resistance coating 41a is formed on the left side and the high friction resistance coating 41b is formed on the right side with the center support portion 413 interposed therebetween.

  As described above, the transport driving roller 41 manufactured by such a manufacturing process is formed by forming a high frictional resistance film on the shaft body 40 in a state where the central support portion 413 is masked, and then removing the masking. The coating pressure at the boundary portion (portion indicated by reference numeral TP) between the portion 413 and the region where the high friction resistance coating 41a and the high friction resistance coating 41b are formed becomes slightly thicker as shown in the figure. The outer diameter is formed slightly larger. The portion indicated by the symbol TP differs depending on various conditions such as the type of high frictional resistance coating and the film thickness. For example, the axial width is about 100 μm and the difference in coating pressure is about 5 μm. It is a protrusion. Since the conveyance drive roller 41 has a portion having a slightly larger outer diameter indicated by TP, a conveyance error of the recording paper P, a tilt in the conveyance direction, and the like occur slightly.

Next, the manufacturing process of the transport drive roller 41 according to the present invention will be described with reference to FIG.
First, a cylindrical metal shaft 40 serving as a base of the transport drive roller 41 is manufactured with a predetermined length and shaft diameter. At that time, the outer diameter of the shaft body 40 is set so that the outer peripheral length of the region where the high frictional resistance film is formed takes a predetermined outer peripheral length in consideration of the film thickness of the high frictional resistance film. In addition, two reduced diameter portions 401 that are substantially concentrically reduced with a predetermined outer diameter difference are provided in the vicinity of both outer sides of the portion that becomes the central support portion 413 by performing groove processing on the shaft body 40. Thus, the shaft body 40 is manufactured (a: shaft body manufacturing process). The predetermined difference in outer diameter takes into account the film thickness of the high frictional resistance film, the height variation of the raised portion (the portion indicated by reference numeral TP), the eccentricity of the reduced diameter portion 401, and the like. Therefore, the outer diameter difference may be sufficiently larger than the height of the raised portion (the portion indicated by reference numeral TP). In this embodiment, the shaft body 40 is manufactured in which the reduced diameter portion 401 is formed so that a step of about 0.1 mm is formed with respect to the film thickness of around several tens of μm.

  Subsequently, in order to prevent the high frictional resistance film from being formed on the central support portion 413 of the shaft body 40, the region sandwiched between the two reduced diameter portions 401 including the portion that becomes the central support portion 413 of the shaft body 40. A masking tape MT is wound around the outer peripheral surface to perform a masking process. For example, as shown in the drawing, the masking tape MT is wound around the outer peripheral surface of a region that is wider outside the center support portion 413 including all the center support portions 413 and does not protrude outside the two reduced diameter portions 401. In other words, the masking tape MT is wound around the outer peripheral surface so that the axial ends of the masking process are respectively located in the reduced diameter portion 401 (b: masking step). In the masking step, the left end support portion 411 and the right end support portion 412 may also be masked with the masking tape MT.

  Subsequently, the high frictional resistance coating S is uniformly applied to the outer peripheral surface of the region of the shaft body 40 in the masked state where the high frictional resistance coating is to be formed with a predetermined film thickness including the masking processing portion ( c: High frictional resistance film forming step). This process is exactly the same as the conventional process. Then, after applying the high frictional resistance coating S, the masking tape MT is removed (d: masking removal step). This process is exactly the same as the conventional process.

  When the masking tape MT is removed, a boundary portion between the masked portion and the unmasked portion (the end portion on the central support portion 413 side of the high friction resistance coating 41a and the high friction resistance coating 41b) is formed. The portions where the high frictional resistance film is extremely small and raised (portions indicated by reference numeral TP) are respectively formed in the two reduced diameter portions 401 as shown in the figure. Since the two reduced diameter portions 401 are substantially concentrically reduced with a predetermined outer diameter difference (about 0.1 mm), a portion (indicated by reference numeral TP) that is raised due to the predetermined outer diameter difference. ) Can be made smaller than the outer diameter of the high frictional resistance coating 41a and the high frictional resistance coating 41b. Thereby, it is possible to prevent the high frictional resistance film 41a and the high frictional resistance film 41b from being formed in a state where the outer diameter of the outer peripheral surface of the transport driving roller 41 is slightly increased in the masked portion. it can. In addition, since the diameter of the portion that becomes the central support portion 413 is reduced without reducing the diameter of the portion that becomes the central support portion 413, the central support portion 413 may be eccentric with respect to the rotation axis of the shaft body 40. Absent. Furthermore, since some eccentricity is allowed to occur in the reduced diameter portion 401, it is easy to form the reduced diameter portion 401 in the manufacturing process of the shaft body 40.

  In this way, the conveyance drive roller 41 having the central support portion 413 on which the high frictional resistance film is not formed is used as the outer diameter of the outer peripheral surface on which the high frictional resistance film is formed (the high frictional resistance film 41a and the high friction resistance). In the state where the outer diameter of the coating 41b is made uniform with high accuracy, it can be easily manufactured without increasing the number of manufacturing steps.

FIG. 7 shows a second embodiment of the manufacturing process of the transport drive roller 41 according to the present invention.
In this embodiment, when manufacturing a cylindrical metal shaft body 40 serving as a base of the transport drive roller 41 with a predetermined length and shaft diameter, a portion serving as the center support portion 413 and the center support portion 413. The shaft body 40 is manufactured so that a series of regions including both outer sides of the portion to be formed have a concentrically reduced diameter with a predetermined outer diameter difference (a: shaft body manufacturing process). That is, the shaft body 40 is manufactured by forming one reduced diameter portion 401 wider than the central support portion 413 including the central support portion 413. Then, in order to prevent the high frictional resistance film from being formed on the central support portion 413 of the shaft body 40, the masking tape MT is wound around the outer peripheral surface of the reduced diameter portion 401 including the portion that becomes the central support portion 413 of the shaft body 40. Masking process (b: masking step). The following steps (c: high frictional resistance film forming step, d: masking removal step) are the same as in the first example.

  In this way, the shaft body 40 is manufactured so that a series of regions including the outer portion of the portion that becomes the central support portion 413 and the portion that becomes the central support portion 413 have a concentrically reduced diameter with a predetermined outer diameter difference. The high friction which may be formed in the boundary part (the edge part by the side of the center support part 413 of the high-friction-resistant film 41a and the high-friction-resistant film 41b) of the part masked and the part which was not masked. The portions where the resistance coating surface is extremely small and raised (portions indicated by reference numeral TP) are respectively formed in the reduced diameter portion 401 as shown in the figure. Therefore, as in the first embodiment, the conveyance drive roller 41 having the central support portion 413 on which the high frictional resistance film is not formed is used as the outer diameter of the outer peripheral surface on which the high frictional resistance film is formed (high friction resistance film). 41a and the outer diameter of the high frictional resistance coating 41b) can be easily manufactured without increasing the number of manufacturing steps in a state where the outer diameters of the high frictional resistance film 41b are made uniform with high accuracy.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

1 is an external perspective view of an ink jet recording apparatus. It is the schematic perspective view which removed the main body cover of the ink jet recording device. It is a principal part perspective view of the internal structure of an inkjet recording device. It is principal part side sectional drawing of the internal structure of an inkjet type recording device. It is a principal part perspective view of the internal structure of an inkjet recording device. It is 1st Example of the manufacturing process of the conveyance drive roller which concerns on this invention. It is 2nd Example of the manufacturing process of the conveyance drive roller which concerns on this invention. It shows the prior art of the manufacturing process of a conveyance drive roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body cover, 2 Top cover, 3 Paper discharge stacker, 4 Tray cover, 5 Switches, 6 Paper feed tray cover, 14 Sub-frame, 15 Middle support member, 16 Adjustment member, 20 Automatic paper feeder, 21 Paper feed roller , 22 paper feed tray, 23 hopper, 40 shaft body, 41 transport drive roller, 42 transport driven roller, 43 transport driven roller holder, 44 paper guide front member, 45 paper guide post member, 46 platen, 47 first paper discharge Drive roller shaft, 48 Second paper discharge drive roller shaft, 51 Carriage motor, 61 Carriage guide shaft, 62 Carriage, 63 Recording head, 100 Inkjet recording device, 401 Reduced diameter portion, 411 Left end support portion, 412 Right end support Part, 413 center support part, 41a, 41b high friction resistance coating, MT masking tape

Claims (8)

A high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the central support portion of the cylindrical body, and is supported rotatably at the both end support portions and the central support portion. A method for manufacturing a transport driving roller for transporting a transported object in a state of being in close contact with the outer peripheral surface of the high frictional resistance coating by rotating a rotational driving force transmitted from a source,
A shaft body manufacturing step for manufacturing the shaft body having a shape in which a series of regions including a portion serving as the center support portion and both outer sides of the portion serving as the center support portion are concentrically reduced with a predetermined outer diameter difference; ,
Before forming a high frictional resistance film on the outer peripheral surface of the shaft body, a masking step of masking the outer peripheral surface of the portion that becomes the central support portion of the shaft body;
A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body after the masking step;
And a masking removal step of removing masking after the high frictional resistance film forming step. A high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the central support portion of the cylindrical body, and is supported rotatably at the both end support portions and the central support portion. A method for manufacturing a transport driving roller for transporting a transported object in a state of being in close contact with the outer peripheral surface of the high frictional resistance coating by rotating a rotational driving force transmitted from a source,
A shaft body manufacturing process for manufacturing the shaft body having a shape having two reduced diameter portions in which the vicinity of both outer sides of the portion serving as the central support portion is reduced substantially concentrically with a predetermined outer diameter difference with a constant width;
A masking step of masking an outer peripheral surface of a region sandwiched between two reduced-diameter portions including a portion to be the central support portion of the shaft body before forming a high frictional resistance film on the outer peripheral surface of the shaft body; ,
A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body after the masking step;
And a masking removal step of removing masking after the high frictional resistance film forming step. 3. The method of manufacturing a transport drive roller according to claim 1, wherein the masking step includes a step of masking the both end support portions of the shaft body. In any one of Claims 1-3, the outer diameter of the area | region which forms the high-friction resistance film of the said shaft body so that the outer periphery length of the area | region in which the high-friction resistance film is formed becomes predetermined | prescribed outer periphery length, In addition, a method for manufacturing a transport drive roller, characterized in that the film thickness of the high frictional resistance film is set. A high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the central support portion of the cylindrical body, and is supported rotatably at the both end support portions and the central support portion. A transport driving roller for transporting a transported object in a state of being in close contact with the outer peripheral surface of the high frictional resistance coating by rotating the rotational driving force transmitted from the source,
A shaft body manufacturing step for manufacturing the shaft body having a shape in which a series of regions including a portion serving as the center support portion and both outer sides of the portion serving as the center support portion are concentrically reduced with a predetermined outer diameter difference; ,
Before forming a high frictional resistance film on the outer peripheral surface of the shaft body, a masking step of masking the outer peripheral surface of the portion that becomes the central support portion of the shaft body;
A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body after the masking step;
A conveyance drive roller, which is manufactured by a manufacturing process including a masking removal process for removing masking after the high frictional resistance film forming process. A high frictional resistance film is formed with a uniform film thickness on the outer peripheral surface excluding both end support portions and the central support portion of the cylindrical body, and is supported rotatably at the both end support portions and the central support portion. A transport driving roller for transporting a transported object in a state of being in close contact with the outer peripheral surface of the high frictional resistance coating by rotating the rotational driving force transmitted from the source,
A shaft body manufacturing process for manufacturing the shaft body having a shape having two reduced diameter portions in which the vicinity of both outer sides of the portion serving as the central support portion is reduced substantially concentrically with a predetermined outer diameter difference with a constant width;
A masking step of masking an outer peripheral surface of a region sandwiched between two reduced-diameter portions including a portion to be the central support portion of the shaft body before forming a high frictional resistance film on the outer peripheral surface of the shaft body; ,
A high friction resistance film forming step of forming a high friction resistance film with a uniform film thickness on the outer peripheral surface of the shaft body after the masking step;
A conveyance drive roller, which is manufactured by a manufacturing process including a masking removal process for removing masking after the high frictional resistance film forming process. 7. The transport drive roller according to claim 5, wherein the masking step includes a step of masking the both end support portions of the shaft body. A recording apparatus that conveys a recording material by a conveyance unit including the conveyance drive roller according to claim 5.

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