JP2005082320A - Carrying roller, pulley or gear fixing method, and liquid injecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrying roller to stabilize rotation of the carrying roller. <P>SOLUTION: This carrying roller 32 is provided with a plurality of axial grooves 302 extended in an axial direction at one end, so that a pulley or a gear is press-fitted to be fixed at one end. The grooves may be formed by rolling. In this case, the grooves can be formed at a low cost. Since the center of gravity of one end 32a is not eccentric, the carrying roller 32 is stably rotated. As taper is formed at one edge, the pulley or gear can be further easily fitted in. In forming the axial grooves 302 by rolling, circumferential grooves 306 to fix the bearing for the carrying roller 32 may be formed in a direction along the outer circumference. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fixing method for a conveying roller, a pulley or a gear, and a liquid ejecting apparatus. In particular, the present invention relates to a transport roller that rotates stably, a method of fixing a pulley or a gear to the transport roller, and a liquid ejecting apparatus using the transport roller.

  An ink jet recording apparatus which is an example of a liquid ejecting apparatus performs recording on a recording object by ejecting ink from the recording head while reciprocating the recording head in the width direction of the recording object such as recording paper. When recording, the ink jet recording apparatus transports the recording material by rotating the transport roller (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2003-65406 (for example, FIG. 2)

  A resin gear or pulley is fixed to one end of the transport roller in order to transmit power from the motor. Conventionally, one end of the conveying roller is cut out so that the cross section has a D-shape, and a gear and a pulley are press-fitted. In this case, since the rotation center of the conveyance roller and the gear or pulley that is press-fitted into one end thereof is decentered, the rotation of the conveyance roller may be unstable.

  According to the first aspect of the present invention, a transport roller for transporting a recording material is used in a liquid ejecting apparatus that ejects liquid to record on the recording material, and has a shaft shape, and a pulley. Or in order to press-fit and fix a gear to one end, a conveyance roller provided with a plurality of axial grooves extending in the axial direction on the outer periphery of one end is provided. According to the first embodiment, since the axial groove is formed at one end, the pulley or the gear can be easily press-fitted. Further, since the rotation center of the gear or pulley press-fitted into one end of the transport roller is not decentered, the transport roller rotates stably.

  The plurality of axial grooves may be formed by rolling. In this case, the axial groove can be formed at low cost. Further, if a taper is provided at the edge between the outer periphery and the end face of one end, it becomes easier to press-fit the pulley or gear.

  A second aspect of the present invention is a liquid ejecting apparatus that ejects liquid to record on a recording material, and is a pulley or gear that fixes a pulley or gear to one end of a conveyance roller that conveys the recording material. A fixing method, in which a groove forming step for forming a plurality of axial grooves extending in the axial direction is formed at one end of the conveyance roller, and a press-fitting in which a pulley or a gear is pressed into one end of the conveyance roller having a plurality of axial grooves formed And a method for fixing a pulley or a gear. According to the 2nd form, the effect similar to a 1st form can be acquired.

In the groove forming step, a plurality of axial grooves may be formed by rolling. In this case, the axial groove can be formed at low cost.
In the groove forming step, when rolling a plurality of axial grooves, a circumferential groove that extends in the circumferential direction on the outer periphery of the conveying roller and defines an axial position of the bearing of the conveying roller is formed with one end. May be formed at different positions. In this case, there is no need to provide a separate step for forming the circumferential groove. Accordingly, the circumferential groove can be manufactured at low cost.

  Furthermore, between the groove forming step and the press-fitting step, there may be provided a grinding step of adjusting the outer diameter by grinding the outer periphery of the transport roller using a centerless grinder. In this case, since the outer diameter is adjusted even after rolling, it becomes easier to press-fit the pulley or gear.

  According to a third aspect of the present invention, there is provided a liquid ejecting apparatus that ejects liquid to record on a recording material, and is a transport roller that transports the recording material, and has a groove extending in the axial direction at one end. Provided is a liquid ejecting apparatus including a plurality of transport rollers, each having a pulley or a gear fixed by press-fitting. According to the 3rd form, the effect similar to a 1st form can be acquired.

  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 of an ink jet recording apparatus 10 which is an example of a liquid ejecting apparatus. The ink jet recording apparatus 10 includes a mounting tray 12 on which a plurality of recording objects 11 are placed, a feeding roller (not shown) that feeds the recording objects 11 placed on the placing tray 12, and a feeding roller. The transported roller 32 and the transport driven roller 34 for transporting the recording material 11 fed to the ink ejecting area in the sub-scanning direction, the recording head 44 for recording on the recorded material 11 in the ink ejecting area, and the transporting roller 32. Step motor 60 is provided. The recording head 44 is mounted on the carriage 42, and reciprocates on the ink ejection area in a direction orthogonal to the sub-scanning direction together with the carriage 42. The conveyance roller 32 is a metal shaft, and a resin pulley 64 is press-fitted at one end. Power is transmitted from the stepping motor 60 to the conveying roller 32 via the belt 62 and the pulley 64. The transport roller 32 is supported by a bearing 66 on the axial center side of the pulley 64. The bearing 66 is fixed to the frame of the ink jet recording apparatus 10. The step motor 60 is controlled by the control unit 80.

  2 is a front view of the conveyance roller 32, and FIG. 3 is an enlarged view of an area surrounded by a broken line in FIG. As shown in FIGS. 2 and 3, the transport roller 32 has a plurality of axial grooves 302 at one end 32a. Each of the axial grooves 302 is formed by a so-called knurling process, extends in the axial direction of the transport roller 32, and is arranged at equal intervals along the outer periphery of the transport roller 32. For this reason, it is easy to press-fit the pulley 64 into the one end 32 a of the conveying roller 32. In addition, the cost is lower than when the cross section of the one end 32a is substantially D-shaped. As shown in FIG. 3, one end 32a of the transport roller 32 has a tapered portion 304 at the edge. For this reason, it is easier to press-fit the pulley 64 into the one end 32 a of the conveying roller 32. When the diameter of the conveying roller 32 is 10.035 mm, the depth of the axial groove 302 is, for example, 0.15 mm. The length of the tapered portion 304 in the axial direction is, for example, 0.8 mm, and the angle of the tapered portion 304 is, for example, 15 ° with respect to the rotation axis of the conveying roller 32.

  As shown in FIG. 2, the conveying roller 32 has two circumferential grooves 306 on the center side in the axial direction from the axial groove 302. The circumferential groove 306 is provided to position the bearing 66 in the axial direction, and is formed over the entire circumference of the conveying roller 32 in the circumferential direction. In addition, when the diameter of the conveyance roller 32 is 10.035 mm, the depth of the circumferential groove 306 is, for example, 0.3925 mm.

  FIG. 4 is an axial cross-sectional view of the transport roller 32 in a state where the pulley 64 is press-fitted into the one end 32 a and further supported by the bearing 66. When fixed to the bearing 66, the two circumferential grooves 306 are respectively fitted with substantially C-shaped rings 72. A plain washer 76, a coil spring 74, a plain washer 76, and a bearing 66 are inserted between the two rings 72 in order from the inner side in the axial direction of the transport roller 32. In such a structure, one end of the coil spring 74 abuts on the ring 72 on the axial center side, the other end urges the bearing 66 toward the one end 32a, and presses the bearing 66 against the ring 72 on the one end 32a side. Yes. In this way, the bearing 66 is positioned in the axial direction with respect to the transport roller 32.

  FIG. 5 is a perspective view of a die of a rolling machine 500 that forms an axial groove 302 and a circumferential groove 306 in the conveying roller 32. The rolling machine 500 includes a pair of knurled fixed dies 514 and knurled movable dies 512, and two sets of circumferential groove formed movable dies 522 and circumferential groove formed fixed dies 524. The knurled fixed die 514 is fixed to the main body of the rolling machine 500 in a direction orthogonal to the axis, and is supported so as to be rotatable around the axis. On the other hand, the knurling movable die 512 is movable to be close to and away from the knurling fixed die 514 in a direction perpendicular to the axis, and is supported by the main body of the rolling machine 500 so as to be rotatable around the axis. ing. The knurling movable die 512 and the knurling fixed die 514 are rotated with the conveying roller 32 interposed therebetween to form the axial groove 302. Further, the circumferential groove forming movable side die 522 and the circumferential groove forming fixed side die 524 form a circumferential groove 306 by rotating with the conveying roller 32 interposed therebetween.

  The knurled movable die 512, the knurled fixed die 514, the circumferential groove formed movable die 522, and the circumferential groove formed fixed die 524 are cylindrical round dies each having the same outer diameter. The knurled movable die 512 and the two circumferential groove formed movable dies 522 are assembled to the movable main shaft 502 in this order. The knurling fixed die 514 and the two circumferential groove forming fixed dies 524 are assembled to the fixed main shaft 504 in this order. As the movable main shaft 502 rotates, the knurling movable die 512 and the two circumferential groove forming movable dies 522 rotate. Further, by rotating the fixed main spindle 504, the knurled fixed die 514 and the two circumferential groove forming fixed dies 524 rotate. The rotational phases of the movable main shaft 502 and the fixed main shaft 504 are synchronized. At this time, the circumferential groove 306 is formed simultaneously with the axial groove 302. For this reason, the cost for forming the circumferential groove 306 is low. In some cases, the movable main shaft 502 and the fixed main shaft 504 are held substantially horizontally by different universal joints.

  FIG. 6 is an enlarged top view of the die of the rolling machine 500. The knurled movable die 512 and the knurled fixed die 514 have the same shape, and have a plurality of rolling protrusions 516 extending in the axial direction on the outer circumferential surface, respectively. The knurl forming movable side die 512 and the knurl forming fixed side die 514 are adjusted so that the knurl forming movable side die 512 and the knurl forming fixed side die 514 are in phase with the conveying roller 32 sandwiched between them. By pressing the rolling projection 516 of the die 512 and the rolling projection 516 of the knurled fixed die 514 against the conveyance roller 32 while rotating synchronously, the conveyance roller 32 is rotated while forming the axial groove 302. At this time, the rolling convex portions 516 of the knurling movable movable die 512 and the knurling fixed fixing die 514 are engaged with the axial groove 302 of the conveying roller 32, so that the knurling movable movable die 512 and the knurled fixing fixed The axial grooves 302 formed by the side dies 514 do not collapse each other.

  The circumferential groove forming movable die 522 has a groove forming convex portion 526 extending over the entire circumference in the rotational direction on the outer peripheral surface, and the circumferential groove forming fixed side die 524 has a groove forming convex portion on the outer peripheral surface. A concave portion 528 that is wider than the groove forming convex portion 526 is provided in a portion facing the portion 526. The concave portion 528 extends the circumferential groove forming fixed die 524 over the entire circumference in the rotational direction. The circumferential groove forming movable side 522 and the circumferential groove forming fixed side die 524 are synchronously rotated in a state where the conveying roller 32 is sandwiched between the circumferential groove forming movable side die 522 and the circumferential groove forming fixed side die 524, The circumferential groove forming movable die 522 rotates the transport roller 32 while the groove forming convex portion 526 is bitten into the transport roller 32. As a result, a circumferential groove 306 is formed in the conveying roller 32. At this time, since the concave portion 528 is formed in the circumferential groove forming fixed side die 524, the circumferential groove forming fixed side die 524 does not deform the circumferential groove 306.

  FIG. 7 is an enlarged view of a cross section of the circumferential groove forming movable die 522 and the transport roller 32 when the groove forming convex portion 526 is rolled onto the transport roller 32. The front end surface 550 of the groove forming convex portion 526 is a curved surface. Therefore, the contact area between the groove forming convex portion 526 and the conveying roller 32 is large, and the groove forming convex portion 526 and the conveying roller 32 are not slippery and have a good processed surface due to the aligning action by the curved surface. Further, the corner 550a of the tip surface 550 is rounded. For this reason, when the groove forming convex portion 526 is removed from the circumferential groove 306, the groove forming convex portion 526 is not easily chipped. Further, since the root portion 552 is an inclined surface, the groove forming convex portion 526 has high rigidity. Further, the side surface connecting the corner 550 a and the root portion 552 is slightly inclined toward the inside of the groove forming convex portion 526. For this reason, the groove forming convex portion 526 is easily removed from the circumferential groove 306.

  FIG. 8 is a flowchart showing a process of forming the axial groove 302 and the circumferential groove 306 in the conveying roller 32 and press-fitting the pulley 64. First, the conveyance roller 32 is prepared (S10). Then, the conveying roller 32 is set on the rolling plate 500 substantially horizontally (S20). At this time, if the conveying roller 32 is tilted so that the one end 32a side is slightly higher than the other end, the conveying roller 32 is difficult to move in the axial direction during rolling. The inclination angle is, for example, 0.361 °. Then, the knurling movable die 512, the knurling fixed die 514, the circumferential groove forming movable die 522, and the circumferential groove forming fixed die 524 of the rolling machine 500 are rotated synchronously, and the axial groove 302 is formed at one end 32a. And a circumferential groove 306 is formed on the axially inner side of the axial groove 302 (S30). At this time, a metal is pushed around the axial groove 302 and the circumferential groove 306 to be pushed around the axial groove 302 and the circumferential groove 306, thereby forming a convex portion.

  Then, the transport roller 32 is set on the centerless grinder (S40), and the centerless grinder is operated to grind the entire outer surface of the transport roller 32. At this time, the convex portions formed around the axial groove 302 and the circumferential groove 306 are ground, and the outer diameter of the conveying roller 32 is adjusted (S50). For this reason, the outer diameter of the conveyance roller 32 is the same in the axial direction. Then, after forming the tapered portion 304, the pulley 64 is press-fitted and fixed to the one end 32a where the axial groove 302 is formed (S60).

  As described above, since the plurality of axial grooves 302 are formed at the one end 32a of the conveying roller 32, the pulley 64 can be easily press-fitted. Moreover, since the one end 32a is not eccentric, the conveyance roller 32 rotates stably. Further, since the axial groove 302 is formed by rolling, the manufacturing cost of the conveying roller 32 is low. Further, since the circumferential groove 306 is formed simultaneously with the formation of the axial groove 302, the manufacturing cost of the conveying roller 32 is further reduced.

  The ink jet recording apparatus 10 is an example of a liquid ejecting apparatus, and the carriage 42 is an example of a liquid ejecting head. However, the liquid ejecting apparatus is not limited to this. Another example of the liquid ejecting apparatus is a color filter manufacturing apparatus that manufactures a color filter for a liquid crystal display. Still another example of the liquid ejecting apparatus is an electrode forming apparatus that forms electrodes such as an organic EL display and an FED (surface emitting display). Still another example of the liquid ejecting apparatus is a biochip manufacturing apparatus that manufactures a biochip. The liquid ejecting apparatus of the present invention includes other liquid ejecting apparatuses having industrial use. The recording object is an object on which recording is performed by ejecting a liquid. In addition to recording paper, a circuit board on which circuit patterns such as electrodes of a display are recorded, a CD-ROM on which a label is printed, DNA The preparation on which the circuit is recorded is included.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said 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.

The perspective view which shows the inkjet recording device 10 in the state which removed the cover Front view of the conveyance roller 32 Enlarged view of the area surrounded by the broken line in FIG. A sectional view in the axial direction of the conveying roller 32 to which the pulley 64 and the bearing 66 are fixed. Perspective view of die of rolling machine 500 Upper surface enlarged view of the die of the rolling machine 500 Enlarged view of the cross section of the circumferential groove forming movable die 522 and the conveying roller 32 Flow chart showing manufacturing process of transport roller 32

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Inkjet recording apparatus, 11 ... Recording object, 12 ... Loading tray, 32 ... Conveyance roller, 32a ... One end, 34 ... Conveyance driven roller, 42 ... Carriage, 44 ... Recording head, 60 ... Step motor, 62 ... Belt, 64 ... pulley, 66 ... bearing, 72 ... ring, 74 ... coil spring, 76 ... plain washer, 80 ... control part, 302 ... axial groove, 304 ... taper part, 306 ... circumferential groove, 500 ... rolling Disc 502, movable side main shaft, 504 ... fixed side main shaft, 512 ... knurled movable die, 514 ... knurled fixed die, 516 ... rolling convex portion, 522 ... circumferential groove formed movable die, 524 ... circle Peripheral groove forming fixed die 526 ... Groove forming convex part, 528 ... Concave part, 550 ... Tip surface, 550a ... Corner, 552 ... Root part

Claims (8)

A transport roller used for a liquid ejecting apparatus that ejects liquid to record on a recording material, and transports the recording material,
A conveying roller having an axial shape and having a plurality of axial grooves extending in the axial direction on the outer periphery of the one end in order to press-fit and fix a pulley or a gear to one end.   The conveying roller according to claim 1, wherein the plurality of axial grooves are formed by rolling.   The conveying roller according to claim 1, wherein the one end has a taper at an edge between an outer periphery and an end surface. A method of fixing a pulley or a gear, which is used in a liquid ejecting apparatus that ejects liquid to record on a recording material and fixes a pulley or a gear to one end of a conveying roller having an axial shape for conveying the recording material. And
A groove forming step of forming a plurality of axial grooves extending in the axial direction on the outer periphery of the one end of the transport roller;
A method of fixing a pulley or a gear, comprising: a press-fitting step of press-fitting the pulley or the gear into the one end of the conveying roller in which a plurality of the axial grooves are formed.   The pulley or gear fixing method according to claim 4, wherein in the groove forming step, the plurality of axial grooves are formed by rolling.   In the groove forming step, a plurality of axial grooves are formed by rolling by pressing a die having a convex portion together with a die used for rolling to the conveying roller, and at the same time, a circular shape is formed on the outer periphery of the conveying roller. The pulley or gear fixing method according to claim 5, wherein a circumferential groove extending in a circumferential direction and defining a position in an axial direction of a bearing of the transport roller is formed at a position different from the one end.   The pulley according to claim 6, further comprising a grinding step of adjusting an outer diameter of the transport roller by grinding an outer periphery of the transport roller using a centerless grinder between the groove forming step and the press-fitting step. How to fix gears. A liquid ejecting apparatus that ejects liquid to record on a recording material,
A liquid ejecting apparatus comprising a transport roller for transporting a recording material, the transport roller having a plurality of grooves extending in an axial direction at one end, and a pulley or a gear fixed to the one end by press-fitting.

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