JP2009256034A - Roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller suitable for a conveyance of a sheet, which can be manufactured easily. <P>SOLUTION: This invention relates to the roller (10) with an annular friction member (14) made of an elastic material attached to the periphery of a core (12). The core (12) is provided with two regulating sections (24) arranged continuously or intermittently along at least a part of the periphery of the core (12). At least a part of the annular friction member (14) is elastically deformed protrusively to the outside in a radial direction at least at a part between both end side sections by regulating both axial end side sections of a cylindrical substrate (30) by the two regulating sections (24). Thus, the annular friction member can be manufactured extremely easily. Moreover, since the annular friction member is elastically deformed, it can be contacted with the sheet and give an adequate conveyance force to the sheet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a roller provided with an annular friction member made of an elastic material on the outer periphery of a circular or D-shaped or fan-shaped core, and an apparatus including the roller.

  Office machines such as copiers, printers, and facsimiles include a mechanism that conveys a sheet onto which an image is transferred or a sheet onto which an image is transferred in a target direction. In general, a sheet conveying mechanism includes a shaft that is rotatably supported and a plurality of rollers that are fixedly supported by the shaft. Each roller usually includes a core fixed to the shaft and an annular rubber member mounted and held on the outer peripheral surface of the core. Generally, the rubber member has an inner peripheral length smaller than the outer peripheral length of the roller, and is mounted and held on the outer peripheral surface of the roller using its own elastic force.

  In such a sheet conveying mechanism, when the outer peripheral surface of the rubber friction member hits the sheet, or when a plurality of rollers provided on one shaft hit the sheet with different pressure contact forces, skew of the sheet is caused. To do. For this reason, it is necessary to strictly control the accuracy of assembly of the shaft to the device or the assembly of the roller to the shaft and the pressure at which the rubber friction member contacts the sheet.

Conventionally, so-called tire type rollers have been proposed in Patent Documents 1 and 2. Such a tire-type roller is generally configured by mounting a tire (friction member) including an outer peripheral cylindrical portion and an annular flange integrally provided on both sides of the outer peripheral cylindrical portion to a wheel (not shown). However, with a tire-type roller, the tire is mounted on the wheel with no or little load applied (ie, undeformed state). Therefore, although it is easily deformed by contact with the sheet, the sheet cannot be brought into contact with a sufficient contact pressure. In addition, the tire of the tire type roller is integrally formed with a mold, but since a pair of annular flanges extend inward from both ends of the outer peripheral cylindrical portion, it is difficult to design the mold (split mold). There is a problem that the die cutting operation is very complicated.
Japanese Patent No. 3238121 Japanese Patent No. 3396024

  An object of the present invention is to solve these problems and provide a new roller suitable for conveying a sheet.

    In order to solve these problems, the roller according to the present invention is a roller (10) in which an annular friction member (14) made of an elastic material is mounted on the outer peripheral portion of the core (12). The core (12) has two restricting portions (24) provided continuously or intermittently along at least a part of the outer periphery of the core (12). At least a portion of the annular friction member (14) is at least a portion between both end portions by restricting both end portions in the axial direction of the cylindrical base material (30) with two restricting portions (24). Is formed by elastic deformation by projecting radially outward.

  In the roller of the present invention configured as described above, the annular friction member is configured by a cylindrical base material, and the cylindrical base material is elastically deformed and attached to the outer periphery of the core. Therefore, it is very easy to manufacture the annular friction member. Further, since the annular friction member is elastically deformed, it can contact the sheet and give a sufficient conveying force to the sheet.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals indicate the same or similar members or parts.

Embodiment 1

  1 to 3 show the roller 10 according to the first embodiment. The roller 10 is a member that is incorporated in a mechanism that conveys a sheet material such as paper, a plastic sheet, and a photograph, and conveys the sheet material based on frictional contact. The sheet material includes a thin flexible sheet (eg, thin paper, plastic film, photograph, cloth, non-woven fabric) and a thick, strong self-supporting sheet (cardboard, plastic card). Accordingly, the roller 10 is, for example, an image forming apparatus (a copying machine, a printer, a facsimile machine, a multifunction machine, a printing machine, etc.) that forms an image on the surface of paper or plastic film, and a cash that has a function of transporting banknotes and plastic cards. It can be used for a handling device, a substrate transport mechanism of a device for applying a material (mainly a liquid material) to the surface of a thin or thick substrate.

  Referring to FIG. 3, the roller 10 has a core 12 having a certain shape and an annular friction member 14 that is deformed by applying a force from the outside.

  The core 12 is integrally formed of a resin such as polyethylene, polypropylene, or polyacetal, or a metal such as aluminum or stainless steel, and has a cylindrical or annular core body 18 having a central axis 16 as a center. Referring to FIG. 3, the core body 18 has a cylindrical through hole 20 centering on the shaft 16. In the embodiment, the through-hole 20 has a circular cross section, but the cross section may be a polygon (triangle, square, other polygon) or an ellipse. The outer peripheral portion of the core body 18 includes an annular groove 22 centered on the shaft 16 and a pair of flanges (outer restricting portions) 24 that face each other in the axial direction via the annular groove 22. The flange 24 may be provided continuously in the circumferential direction or may be provided intermittently. In the embodiment, a protrusion (inner restricting portion) 26 extending radially outward from the bottom of the annular groove 22 is formed in the center of the annular groove 22 continuously or intermittently in the circumferential direction. An annular positioning groove 28 is formed between the portion 26 and both side flanges 24. In the embodiment, the flange 24, the protrusion 26, and the annular positioning groove 28 are continuous in the circumferential direction, but may be provided intermittently.

  The friction member 14 is formed of, for example, ethylene-propylene-diene rubber (EPDM), silicon, urethane, chlorinated polyethylene, and has a straight cylindrical shape before being attached to the core 12 as will be described later. It is elastically deformed when mounted on the outer periphery of the core 12. Specifically, as shown in FIG. 4A, the friction member (hereinafter referred to as “friction base material”) 30 before elastic deformation is a straight tubular cylinder, and an inner portion centering on the central axis 32. It has a peripheral surface 34 and an outer peripheral surface 36, and an annular end surface 38 that connects the inner peripheral surface 34 and the end of the outer peripheral surface 36. As shown in FIGS. 1 and 2, a plurality of grooves (knurls) 40 extending in the axial direction may be formed on the outer peripheral surface 36.

  As shown in FIG. 5, the friction base material 30 is obtained by cutting a long cylindrical body 42 formed using a mold into a predetermined length, for example. As shown in FIG. 4, the friction base material 30 cut to a predetermined length is pressurized from both end surfaces 38 in the direction of the central axis 32, and the inner peripheral surface 34 and the central portion 43 of the outer peripheral surface 36 (FIG. 4). 2) is deformed into a state of projecting (bulging) radially outward (arch shape, U-shaped cross section), and both end portions 38 are fitted into the annular positioning grooves 28 of the core body 18 and attached to the core 12.

  As shown in the figure, the friction member 14 attached to the core 12 presses both end portions (particularly, both end outer peripheral portions 39) against the opposing flange 24 on the basis of its own elastic recovery force. Stably held between. As a result, a stable U-shaped friction member 14 is formed around the core 12. In order to eliminate the radial movement (rattle) of the friction member 14 with respect to the core 12, the bottom surface 44 (see FIGS. 3 and 4) of the annular positioning groove 28 with the friction member 14 mounted on the core 12 and It is preferable to determine the size of the friction member 14 so that the opposing friction member end faces 38 contact each other without any gap. Moreover, it is preferable that the friction member 14 has the relationship of the outer diameter D, the thickness T, and the axial direction length W of D> = W> T. Further, in the illustrated embodiment, the thickness of the friction member 14 is smaller than the axial width of the positioning groove 28 of the core 12, but the thickness of the friction member 14 is the same as or slightly the same as the width of the positioning groove 28. If it is increased, the friction member 14 can be stably held in the positioning groove 28.

  In order to keep the outer shape of the friction member 14 attached to the core 12 constant, and so that the friction member portion is easily deformed by contact with the sheet material, the deformed friction member portion further has its own elastic recovery force. It is preferable to provide a communication portion (air hole) 48 that communicates the space 46 (see FIG. 3) inside the friction member 14 with the outside so that the U-shaped cross section is restored based on the above. In the embodiment, as shown in FIG. 3, one or a plurality of communication portions 48 extending in the radial direction from the outer peripheral surface of the protrusion 26 of the core body 18 toward the central through hole 20 are formed. The position and size of the air holes 48 are not limited to the illustrated form. For example, as shown in FIG. 22, a groove-shaped communication portion 49 extending from the outer peripheral surface of the main body 18 of the core 12 to the outer peripheral end portion of the flange through the inner surfaces of both flanges 23 is formed, and a space 46 is formed via the communication portion 49. May be communicated to the atmosphere.

  Before attaching the friction member 14 to the core 12, it is preferable to add a U-shaped habit (preliminary deformation) to the friction member 14. Specifically, as shown in FIG. 6, a solid or hollow cylindrical jig 50 having an outer diameter larger than that of the friction base material 30 before deformation and an annular curved surface bulging outward on the outer periphery is prepared. To do. Next, the friction base material 30 is mounted on the outer periphery 52 of the cylindrical jig 50 and left for a predetermined time. As a result, the outer periphery of the friction base material 30 removed from the cylindrical jig 50 is preliminarily provided with an arch shape or arc shape 52 bulging outward.

  As shown in FIG. 3, the roller 10 is attached to the shaft 54 by inserting a metal shaft 54 into the central through hole 20. When the roller 10 functions as a conveying roller that conveys the sheet based on friction with the sheet, the roller 10 is fixed to the shaft. When the roller 10 functions as a driven roller that rotates following the movement of the sheet, the roller 10 is rotatably supported by the shaft. As described above, the shaft 54 to which one or a plurality of rollers 10 are attached in this manner is incorporated in a sheet conveying mechanism such as an image forming apparatus and used for conveying a sheet.

  FIG. 7 shows the deformed shape of the friction member 14 when the sheet 56 is pressed against the outer peripheral surface of the roller 10. The sheet 56 is assumed to be supported on a stable substrate (not shown). As illustrated, in the roller 10, the entire portion deformed by contact with the sheet 56 strikes the sheet 56 with sufficient contact force. Therefore, when the roller 10 is employed as a sheet conveying member such as a copying machine, a sufficient sheet conveying force can be stably obtained. However, as shown in FIGS. 8 and 9, in the case of a roller having a tire-type friction member 62 integrally formed with a cylindrical outer peripheral surface 58 and an annular flange 60 extending radially inward from both ends of the cylindrical outer peripheral surface 58, Since it is not elastically deformed while being attached to the core 12, as shown in FIG. 10, when the friction member 62 is pressed against the sheet 56, only the outer peripheral edge portion of the cylindrical outer peripheral surface 58 comes into contact with the sheet 56. The outer peripheral surface located between the outer peripheral edges does not contact the sheet 56. Therefore, when this roller 10 is employed as a sheet conveying member for a copying machine or the like, a sufficient conveying force cannot be applied to the sheet.

  A contact state between the roller 10 and the sheet will be described. As shown in FIGS. 11A and 11B, when the central axis of the shaft 54 and the roller 10 is parallel to the sheet 56, the contact surface 64 between the roller 10 and the sheet 56 has a symmetrical elliptical shape without deformation. . As shown in FIGS. 11C and 11D, when the central axis of the shaft 54 and the roller 10 is not parallel to the sheet 56, the contact surface 66 between the roller 10 and the sheet 56 is slightly deformed. It becomes an asymmetrical ellipse extending in the sheet conveying direction. On the other hand, in the roller (see FIG. 8) with the tire-type friction member 62 not elastically deformed, the shaft 54 and the central axis of the roller 10 are parallel to the sheet 56 as shown in FIG. The contact surface 68 between the roller 10 and the sheet 56 has a substantially rectangular shape extending in the direction of the central axis, but when the shaft 54 and the central axis of the roller 10 are not parallel to the sheet 56, the roller 10 and the sheet 56 The contact surface 70 has a substantially triangular shape, and clearly has different shapes on the left and right. Therefore, when the roller 10 according to the present invention is employed in a sheet conveying mechanism such as a copying machine, even if there is an error in the mounting position of the shaft, the sheet conveying property is hardly affected. However, when the tire type roller is used in a sheet conveying mechanism such as a copying machine, a slight skew in the shaft causes the sheet to skew and induce a jam.

Experiment 1

  Regarding the roller A of the present invention shown in FIG. 13 and the roller B in which a circular friction member having a square cross section is mounted on the outer periphery of the circular core, the change in the frictional force caused by paper dust was examined. The friction members attached to the roller A and the roller B were formed of the same material. The configuration of the apparatus used for the experiment is shown in FIG. As shown in the figure, the apparatus has a shaft 74 that is drivingly connected to a motor 72, and rollers A and B can be fixed to the shaft 74. A pressing jig 76 is arranged in the vicinity of the shaft 74. The pressing jig 76 is rotatably supported at the lower end of the vertical arm 80 supported so as to be swingable around a swing shaft 78 disposed above. One end of the thread 82 is connected to the upper end of the arm 80. The thread 82 extends in the horizontal direction from the connecting portion of the arm 80, and is directed downward through a fulcrum 84, and a load (weight) 86 is connected to the other end. Accordingly, the pressing jig 76 is pressed against the rollers A and B attached to the shaft 74 with a predetermined force. Between the rollers A and B and the pressing jig 76, a strip-shaped paper 90 whose upper end is connected to the load cell 88 is disposed. Thus, when the motor 72 is driven to rotate the rollers A and B, tension is applied to the paper 90 held between the rollers A and B and the pressing jig 76, and the tension is measured by the load cell 88.

In measuring the frictional force, paper dust was adhered to the outer peripheral surfaces of the rollers A and B. In this operation, paper dust was uniformly applied to the outer peripheral surface of the roller with a brush, and then air was blown from a position 30 cm away from the roller to blow off excess paper dust from the roller. Next, a roller with paper dust attached was attached to the shaft 74, and the paper was changed every 8 seconds to record the conveyance force (measured value of the load cell). The same experiment was performed three times, and the average value of the recorded conveying force was divided by the load, and the initial friction coefficient after 8 seconds, 16 seconds, 24 seconds, and 32 seconds, μ ₀ , μ ₈ , μ ₁₆ , μ ₂₄ , and μ ₃₂ were obtained. The results are shown in Table 1. In the table, the rate of change is a value obtained by dividing the difference between the coefficient of friction after 32 seconds and the initial coefficient of friction by the elapsed time (32 seconds), and serves as an index for judging the recoverability of the coefficient of friction.

  As shown in Table 1, in the roller A according to the present invention, the coefficient of friction increased with the passage of time, and showed high recoverability of the coefficient of friction. This is because in Roller A, the outer peripheral surface of the roller is greatly deformed by repeated contact and non-contact with the paper, while the deformed state and the original state are repeated alternately, and a large amount of paper dust is removed from the outer peripheral surface of the roller. It is thought to be due to. On the other hand, in the roller B of the comparative example, since the large deformation as in the roller A is not repeated, it is considered that the recovery of the coefficient of friction remained at a low value due to insufficient removal of paper dust. It is done.

  Thus, when the roller according to the present invention is incorporated in a copying machine or the like and used as a paper transport roller, there is no problem that the transport force is reduced due to the adhesion of paper dust. In other words, stable paper conveyance performance can be obtained over a long period of time.

Experiment 2

Regarding rollers A and B, the relationship between the load and the friction coefficient was examined using an apparatus (trade name: HEIDON TYPE 14DR) manufactured by Shinto Kagaku Co., Ltd. The applied loads were 100 g, 500 g, 900 g, and 1500 g, and the friction coefficients f ₁₀₀ , f ₅₀₀ , f ₉₀₀ , f ₁₅₀₀ , the friction coefficient ratio, and the change in the friction coefficient for each load were calculated. The results are shown in Table 2.

  As is apparent from Table 2, the roller A according to the present invention has less change in the coefficient of friction due to the change in load than the roller B. Therefore, a substantially constant sheet conveyance property can be obtained regardless of the accuracy of setting the pressure contact force of the roller.

Embodiment 2

  FIG. 15 shows a roller 100 according to the second embodiment of the present invention. As shown in the drawing, in the roller 100 of the second embodiment, annular flanges (outer restricting portions) 124 are integrally formed on the outer peripheral portion of the cylindrical or annular core 112 on both end sides in the axial direction. Each annular flange 124 is inclined from the position slightly moved radially inward from the radially outer end of the annular flange 124 toward the central axis toward the inner end from the outer end in the axial direction (that is, It has an inclined surface 180 that gradually decreases in height. The inclined surface 180 does not need to be flat, and may be a curved surface curved inward or outward as required. According to the roller 100 configured as described above, the friction member 114 attached to the core 112 is restricted from moving outward in the axial direction by the annular flange 124, and the end surfaces 139 of both end portions 138 of the friction member 114. Is positioned in contact with the inclined surface 180.

  In the second embodiment, as shown in FIG. 16, an inner regulating portion 182 that regulates the movement of the friction member 114 inward may be provided in the vicinity of the inner end of the inclined surface 180 continuously or intermittently in the circumferential direction. Good. In the illustrated embodiment, the inner regulating member 182 is provided only on the right side of the figure, but may be provided only on the left side or on both the left and right sides. According to the second embodiment, the rollers 100 having different outer diameters can be obtained by changing the angle of the inclined surface 180. Further, by reducing the curvature of the friction member 114, it is possible to reduce the outer peripheral strain of the friction member 114 that is elastically deformed (this strain appears as a local variation in the outer diameter). Further, as shown in FIG. 23, the inner surface of the flange 124 adjacent to the inclined surface 180 is formed of a protrusion that restricts the outer peripheral edge of the elastically deformed friction member 114 from the radially outer side to the inner side. The portion 181 may be provided continuously or intermittently in the circumferential direction.

  FIG. 17 shows a modification of the roller according to the second embodiment. As shown in the drawing, in the rollers 110 (110L, 110R) of this modification, the inclination angles of the left and right inclined surfaces 184, 186 are set to values different from those of the other. Specifically, in the roller 110L shown on the left side of FIG. 17, the inclination angle of the right inclined surface 186 is larger than that of the left inclined surface 184, and in the roller 110R shown on the right side of FIG. The inclination angle of the surface 186 is larger than that of the right inclined surface 184. According to the apparatus in which the roller 110 (110L, 110R) configured as described above is attached to the shaft 188, the maximum outer diameter position 190 of the roller 110 moves toward the gently inclined surface side. Specifically, in the illustrated embodiment, the maximum outer diameter position 190 of each of the left and right rollers 110 has moved outward, and the maximum outer diameter position distance L1 between both rollers 110 is larger than the distance L2 between the center positions. ing. Although not shown, if the left and right rollers 110 shown in FIG. 17 are replaced, the distance between the maximum outer diameter positions of both rollers 110 becomes smaller than the distance between the center positions. Therefore, the maximum distance between the outer diameter positions can be appropriately changed according to the configuration and situation of the apparatus in which the roller 110 is incorporated.

Embodiment 3

18 and 19 show the rollers 210 and 310 according to the third embodiment of the present invention. As shown in the figure, in the rollers 210 and 310 of the third embodiment, the cores 212 and 312 are formed of a D-shaped core obtained by cutting off a part of the circular core of the above-described embodiment (a part including a part of the arc). . In the embodiment, the cores 212 and 312 exist over a region of a predetermined circumferential angle, and the arc outer peripheral portions 280 and 280 extend along virtual circles 217 and 317 having a constant radius centered on the central axes 216 and 316, respectively. 380 and outer peripheral portions 282 and 382 existing in the inner region of the region surrounded by the virtual circles 217 and 317. In the embodiment, the outer peripheral portions 282 and 382 are represented as straight outer peripheral portions. However, the outer peripheral portions do not have to be straight, and have an arch shape recessed inward, an arch shape bulging outward, or the like. Any shape can be adopted. The arc outer peripheral portions 280 and 380 have an annular flange and a positioning groove or an annular flange and an annular inclined surface, as in the embodiment described above. Moreover, the form which has a flat outer peripheral surface without a groove | channel may be sufficient as the linear outer peripheral parts 282 and 383. In this case, as shown in FIG. 18B, both side annular ends of the friction member 214 may protrude from the side surface of the core 212. The linear outer peripheral portions 282 and 383 may be provided with an annular flange and a positioning groove or an annular flange and an annular inclined surface. Therefore, the friction member 214 portion positioned on the arc outer peripheral portions 280 and 380 is held in a substantially U-shaped or arched cross section that is elastically deformed, and the friction members 214 and 314 portions positioned on the linear outer peripheral portions 282 and 382 are flat. Or a substantially U-shaped cross section.

  The rollers 210 and 310 configured as described above are used as a sheet feeding roller in a sheet feeding unit of a copying machine or the like, and at the time of sheet feeding, the portions of the friction members 214 and 314 on the arc outer peripheral portions 282 and 382 are the sheet feeding cassette. When the sheet is not fed, the friction members 214 and 314 on the linear outer peripheral portions 282 and 382 are separated from the sheet contained in the sheet feeding cassette. Kept in a state.

  FIG. 20 shows a modification of the roller according to the third embodiment. As shown in the drawing, in the roller 410 of this modification, as shown in FIG. 20C, the annular flange 424 of the core 412 is symmetrical with respect to the central cross section 452 orthogonal to the central axis 416, and is on the linear outer peripheral portion 482 side. From the circular arc outer peripheral portion 480 toward the central portion so that the width gradually decreases. Therefore, as shown in FIGS. 20A and 20B, when the friction member 430 is attached to the inclined core 412, the friction member portion attached to the arc outer peripheral portion 480 between the inclined flanges 424 is at the core central portion. It has a U-shaped cross section with the largest curvature, and gradually has a smaller curvature U-shaped cross section as it moves away from the center of the core. As a result, the roller 410 has a maximum outer diameter (distance from the central axis) at the center of the outer peripheral portion of the arc, and has a smaller outer diameter as the distance from the roller 410 increases.

  In addition, although the core of the friction member core of Embodiment 3 mentioned above was made into D type, this core may be fan-shaped.

Embodiment 4

  The roller of the present invention is not limited to the above-described embodiment, and can be variously modified. For example, the core may have a function of holding the elastically deformed friction member in a deformed state. Therefore, the form of the core is not limited to the above-described embodiment. For example, the friction members 514 and 614 that are externally elastically deformed by being mounted on the shaft combined cores 512 and 612 like the rollers 510 and 610 shown in FIG. Those regulated by outer regulating members 524 and 624 attached to 512 and 612 are also included in the present invention. Naturally, as shown in FIG. 21B, a member 626 that restricts the end of the deformed friction member 614 from the inside may be provided.

  The core may be divided into a plurality of parts. For example, the core 712 having the form shown in FIG. 24 is divided into two core portions 713a and 713b at the center of the core body 718 along a cross section intersecting the central axis. When the roller 710 is assembled, the friction member 714 is mounted on one core portion (the left core portion 713a in FIG. 24A). Next, the two core portions 713a and 713b are connected. At this time, the end surface 739 in the both end portions 738 of the friction member 714 is pressed between the core portions 713a and 713b, and the end surface 739 of the friction member 714 hits the inclined surface 780 in a state where the core portions 713a and 713b are connected. The central portion 743 of the friction member 714 is deformed into a state of projecting (bulging) radially outward (an arch shape or a U-shaped cross section). Thus, according to the core 712 of this form, the friction member 714 is simultaneously attached to the core 712 when the core 712 is assembled. Therefore, the friction member 714 can be easily attached.

  The divided core portions 713a and 713b can be connected by an appropriate connecting means. For example, as shown in FIG. 25 (a), a plurality of engaging recesses 750 are formed in the outer peripheral portion or end surface of the core body 718a in the core portion 713a, while corresponding to the end portion of the core body 718b in the other core portion 713b. The engaging protrusions 752 may be engaged with the engaging recesses 750 when the plurality of engaging protrusions 752 are formed and the core portions 713a and 713b are connected. Alternatively, as shown in FIG. 25 (b), an inner screw 754 is formed on the inner surface of the cylindrical core body 718a of the core portion 713a, while an outer screw 756 is formed on the cylindrical core body 718b of the other core portion 713b. The outer screw 756 may be screwed onto the inner screw 754.

Embodiment 5

  The friction member 714 attached to the roller of the present invention and elastically deformed only needs to protrude in the radial direction as a whole in cross section. Therefore, as shown in FIG. 26, the present invention also includes a roller 810 having a recess 860 in which the central portion of the friction member 814 attached to the core 812 faces inward in the radial direction. As shown in FIG. 27, in this roller 810, when the shaft 854 is parallel to the sheet 856, the contact region 864 between the friction member 814 and the sheet 856 is formed by partially overlapping two circles. In addition, when the shaft 854 is not parallel to the sheet 856, one circle in the contact region 866 is small, but in any case, the circle is partially overlapped. There is no difference.

Embodiment 6

  The roller according to the present invention can also be used as a roller for supporting the belt of the belt type sheet conveying apparatus. For example, FIG. 28 shows a belt-type sheet conveying apparatus 900. The conveying apparatus 900 has a pair of shafts 954a and 954b arranged in parallel. The rollers 910a and 910b of any of the above-described embodiments are fixed to the shafts 954a and 954b, and a belt 920 is wound around the roller 910a of one shaft 954a and the roller 910b of the other shaft 954b. According to the sheet conveying apparatus 900 configured as described above, since the belt 920 is supported by the elastically deformed friction member attached to the rollers 910a and 910b, the vibration of the belt 920 generated along with the sheet conveyance is elastic. Absorbed by the deformed friction member, stable sheet conveyance is obtained. Further, since the belt 920 is elastically supported by the repulsive force received from the elastically deformed friction member, the bending of the belt 920 is reduced. Therefore, the vibration of the belt is reduced, and stable sheet conveyance is obtained.

  As shown in FIG. 29, the roller 910c of the present invention is disposed between the rollers 910a and 910b that support the belts 920, and the belt that supports the roller 910c by the shaft 954c and extends between the rollers 910a and 910b. An intermediate portion of 920 may be supported by roller 910c. In this case, the same effect as that of the embodiment shown in FIG. 28 can be obtained. In the form shown in FIG. 29, the rollers 910a and 910b on both sides may be rollers composed only of the core, that is, rollers without a friction member.

  As mentioned above, although several embodiment was demonstrated separately, these several embodiment and those modifications can be used in combination, The combination of such some embodiment and modification is the present invention. It should be understood that it is included in the technical scope.

  As apparent from the above description, according to the roller of the present invention, the friction member is formed by elastically deforming a straight cylindrical base material. Therefore, it is very easy to manufacture the friction member. In particular, as compared with a tire-type roller, the mold manufacturing and die-cutting operations become extremely easy. Further, since the friction member is held by the core in an elastically deformed state, the friction member can be brought into contact with the sheet to give the necessary transportability to the sheet. Even when a large load is applied to the roller, no large noise is generated by the contact between the roller and the sheet.

The front view of the roller which concerns on Embodiment 1 of this invention. The side view of the roller shown in FIG. Sectional drawing of the roller shown in FIG. The figure which shows the friction base material which comprises a friction member, a core, and those assembly states. The figure explaining the manufacturing process of a friction member and a roller. The figure which shows the jig | tool which preforms a friction member, and its process. FIG. 3 is a diagram illustrating a contact state between a roller and a sheet according to the first exemplary embodiment. The perspective view which excised a part of tire type roller. Sectional drawing of a tire type roller. The figure which shows the contact state of a tire type | mold roller and a sheet | seat. FIG. 3 is a diagram illustrating a contact state between a roller and a sheet according to the first exemplary embodiment. The figure which shows the contact state of a tire type | mold roller and a sheet | seat. Sectional drawing of roller A, B used in Experiment 1. FIG. The block diagram of the apparatus used for the experiment 1. FIG. FIG. 5 is a diagram illustrating a roller according to a second embodiment. The figure which shows the modification of the roller which concerns on Embodiment 2. FIG. FIG. 10 is a view showing another modification of the roller according to the second embodiment. FIG. 6 is a diagram illustrating a roller according to a third embodiment. FIG. 6 is a diagram illustrating a roller according to a third embodiment. FIG. 10 is a view showing a modified example of the roller according to the third embodiment. The figure which shows the roller of the other form of this invention. The figure which shows the other form of an air communicating path. The figure which shows the other form of a core. The figure which shows the roller which concerns on Embodiment 4 which has a division | segmentation core. The figure which shows the connection structure of a split core. The figure which shows the roller of Embodiment 5 containing the elastic deformation friction member which has a hollow in a center part. FIG. 10 is a diagram illustrating a contact state between a roller and a sheet according to a fifth embodiment. FIG. 10 is a perspective view of a sheet conveying apparatus according to a sixth embodiment. FIG. 10 is a diagram illustrating a modification of the sheet conveying apparatus according to the sixth embodiment.

Explanation of symbols

10: roller 12: core 14: annular friction member 16: central shaft 18: core body 20: through hole 22: annular groove 24: annular flange (outer restricting portion)
26: Projection (inner regulation part)
28: positioning groove 30: friction base material 32: central axis 34: inner peripheral surface 36: outer peripheral surface 38: annular end surface 40: groove (knurl)
42: Long cylindrical body 42: Center portion 44: Bottom surface 46 of annular positioning groove 46: Space 48: Air hole 50: Cylindrical jig 52: Arc shape 54: Shaft 56: Seat 58: Cylindrical outer peripheral surface 60: Annular flange 62: Tire type friction member

Claims (9)

A roller (10) equipped with an annular friction member (14) made of an elastic material on the outer periphery of a core (12),
The core (12) has two restricting portions (24) provided continuously or intermittently along at least a part of the outer periphery of the core (12),
At least a part of the annular friction member (14) is between the both end portions by restricting both end portions in the axial direction of the cylindrical base member (30) with the two restricting portions (24). A roller formed by elastically deforming at least a portion protruding radially outward. The roller according to claim 1, wherein the outer diameter (D), the axial length (W), and the thickness (T) of the cylindrical base material (30) have a relationship of D ≧ W> T. The restricting portion (24) has a pair of flanges (24) provided at both axial ends of the core (12) and projecting radially outward, and the elastically deformed friction member (14) is The roller according to claim 1, wherein the roller is regulated by the pair of flanges (24). The core (12) includes an inclined surface (180) inclined from the radially outer side toward the inner side from the outer side in the axial direction to the inner side of the pair of restricting portions (24), 2. A roller according to claim 1, characterized in that the annular end surface (139) of the deformed friction member is in contact with the surface (180). 5. A roller as claimed in claim 4, characterized in that the inclined surfaces (184, 186) have different inclination angles. The roller according to claim 1, wherein the core (12) has a communication portion (48) for communicating the space (46) inside the deformed friction member (14) with the outside. The core (212) includes an arc-shaped first outer peripheral portion (280) extending along a circle (217) centering on the central axis of the core (212), and a region inside the circle (217). The roller according to claim 1, wherein the roller is a D-shaped or fan-shaped core having a second outer peripheral portion (282) located at the center. The roller according to claim 1, wherein each of the restricting portions (412) is inclined symmetrically with respect to a plane (452) perpendicular to the axis (416) of the core (412). The apparatus provided with the roller in any one of Claims 1-8.

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