JP2012066932A - Roll medium holding mechanism, roll sheet feeder, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll medium holding mechanism capable of regulating positional displacement to a spool of the roll recording medium or the holding member thereof without separately preparing a mechanism for locking the same recording medium to the spool.SOLUTION: The mechanism holds a roll sheet 30 being a recording medium in a spool. A flange 31 is supported movably in an axial direction of a shaft member 36 of the spool. A shaft central core 40 for holding includes a cylindrical part inserted into the end of shaft member 36, pilot guides 42 projecting toward an outer periphery in a radial direction to abut on an inner surface of a central core tube of the roll sheet 30, and a plurality of elastic members 43 arranged between the pilot guides. The elastic members 43 are deformable in the radial direction of the roll sheet 30, and in a state that it is attached to the shaft member 36 of the roll sheet 30, the elastic member 43 abut also on the shaft member 36 in addition to the inner periphery surface of the central core tube 30a of the roll sheet 30 to impart abutment pressure and regulates displacement in the axial direction of the flange 31 and the axial direction of the shaft member 36 of the shaft central core 40.

Description

  The present invention relates to a roll medium holding mechanism, a roll paper feeding device using the same, and an image forming apparatus.

  In a roll paper feeding device used as a recording medium in a large-sized image forming apparatus in recent years, if there is slack or looseness when transporting paper fed from roll paper, a phenomenon such as skew feeding or wrinkling of the roll paper may occur. Prone to occur. Therefore, it is necessary to apply an appropriate tension to the roll paper.

  In view of this, some roll paper feeders themselves are provided with a mechanism for transmitting drive in the rewinding direction. Currently, as a mainstream method, a roll shaft is passed through a long shaft member (spool), and a holding member (flange) is attached to the relay with the core tube to rotate and hold the drive force via the spool and flange. Is known to perform rotation control such as imparting tension to roll paper and rewinding operation.

  However, since the width of the roll paper to be used differs depending on the size of the image to be recorded, it is necessary to fix the flange to the spool shaft, and by attaching a mechanism for locking the elastic member to fix the flange to the spool, etc. A technique for suppressing the thrust play between the flange and the spool is already known.

  However, the conventional method of providing a mechanism for fixing an elastic member has a problem that a separate locking mechanism is required. Patent Document 1 discloses an invention in which an elastic member is provided on the flange in order to fix the flange to the spool, and roll papers having different inner diameters can be attached while restricting the axial direction of the spool and the flange. . However, this is a system in which a mechanism for fixing the elastic member is provided, and the problem that a separate locking mechanism is required cannot be solved.

  Therefore, in the present invention, without separately preparing a mechanism for locking the roll-shaped recording medium to the spool, a roll-medium holding mechanism, a roll paper feeding device, which can regulate the positional movement of the roll-shaped recording medium and its holding member with respect to the spool, And an image forming apparatus using the same.

  The roll-shaped recording medium holding mechanism according to the first aspect of the present invention is a roll-shaped recording medium holding mechanism for holding a roll-shaped recording medium on a spool, and the spool has an axial direction of the spool. In a roll-shaped recording medium holding mechanism provided with a holding member that is movably supported on the recording medium and an elastic member that is attached to the holding member and can be deformed in the radial direction of the roll-shaped shape of the recording medium, With the recording medium attached to the shaft member, the elastic member contacts the shaft member together with the inner peripheral surface of the core tube of the roll-shaped recording medium to apply a contact pressure, and the shaft member of the holding member It is possible to restrict movement in the axial direction.

  According to the second aspect of the present invention, in the roll-shaped recording medium holding mechanism according to the first aspect, a friction member is provided at a portion where the elastic member contacts the shaft member, and the friction member contacts the shaft member. Thus, the restriction force of the axial movement of the holding member is increased.

  According to a third aspect of the present invention, in the roll-shaped recording medium holding mechanism according to the first or second aspect, a rib-shaped guide guide is provided on the outer periphery of the holding member.

  According to a fourth aspect of the present invention, in the roll-shaped recording medium holding mechanism according to the third aspect, a plurality of the rib-shaped guide guides are provided, and the elastic member is disposed between the plurality of guide guides. And

  According to the fifth aspect of the present invention, in the roll-shaped recording medium holding mechanism according to any one of the first to fourth aspects, the holding member is attached to the elastic member so as to be operable from the outside of the holding member and is held by an external operation. The member can be taken out from the spool.

  The roll sheet feeder according to claim 6 uses the roll-shaped recording medium holding mechanism according to any one of claims 1 to 5.

  An image forming apparatus according to a seventh aspect includes the roll-shaped recording medium holding mechanism according to any one of the first to fifth aspects or the roll sheet feeding device according to the sixth aspect.

  According to the present invention, the positional movement of the roll-shaped recording medium and its holding member with respect to the spool can be regulated without separately preparing a mechanism for locking the roll-shaped recording medium to the spool.

An explanatory perspective view showing the overall configuration of the inkjet recording apparatus Schematic side view of the device The perspective view which shows the structure of the flange in Example 1. FIG. A perspective view when attaching a flange, a shaft member constituting a spool, and roll paper Side view of the flange fitted into the roll paper core tube Sectional drawing which shows the state which attached the flange of the movable side to the roll paper with a small internal diameter of a core pipe Sectional drawing showing a state where a roll paper core tube with a large inner diameter is attached to the flange Sectional drawing which shows Example 2 of this invention

  The apparatus according to the embodiment of the present invention has the following characteristics regarding a member that rotates and holds a roll paper that is a roll-shaped recording medium. In short, the elastic member provided on the flange fixes the rotation of the roll paper. At the same time, the flange and the spool are also fixed in the thrust direction.

  Therefore, the roll medium holding mechanism is attached to a holding member for holding a roll-shaped medium, includes an elastic member that can be deformed in the radial direction, and the holding member is rotatably supported. In addition, a shaft member that can move in the axial direction is provided, and when the roll paper is attached, the elastic member applies contact pressure to the inner peripheral surface of the core tube diameter of the roll medium, and also applies contact pressure to the shaft member. Thereby, movement of the holding member and the shaft member in the axial direction is restricted. Furthermore, the elastic member fixed on the holding member applies a contact pressure to the inner peripheral surface of the roll paper core tube, and simultaneously applies a contact pressure to the shaft member, thereby holding without a separate locking mechanism. The movement of the member and the shaft member in the axial direction is restricted.

  Further, the friction member provided on the surface where the elastic member abuts on the shaft member comes into contact with the shaft member, so that the regulating force in the axial direction can be increased and the backlash in the axial direction can be more effectively regulated.

  The release member is slidably attached to the flange, and the release member is attached so that the tip of the release member is caught by the end of the elastic member. Thus, when the release member is pulled out from the flange, the end portion of the elastic member is pulled by the release member, and the contact pressure acting on the inner peripheral surface of the roll paper and the outer peripheral surface of the spool is released. When the release member is pulled as it is, it is caught by the flange, so that the flange can be easily pulled out from the roll paper core tube only by pulling out the release member.

  In addition, a guide guide is provided around the shaft core portion of the holding member to improve the attachment property of the roll paper to the flange, and further, the shift between the center of the roll paper and the center of the shaft member is suppressed. Unnecessary deformation can be avoided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. An example of an ink jet recording apparatus as an image forming apparatus according to the present invention will be described with reference to FIGS. 1 and 2, but the present invention is not limited to the implementation in the illustrated apparatus.

<Example 1>
FIG. 1 is a perspective explanatory view showing the overall configuration of the ink jet recording apparatus, and FIG. 2 is a schematic side explanatory view of the apparatus. The illustrated ink jet recording apparatus is a serial type ink jet recording apparatus, and an image forming unit 2, a paper suction conveyance unit 3, a roll paper storage unit 4, and the like are disposed inside the recording apparatus main body 1. In the image forming unit 2, a guide rod 13 and a guide rail 14 are spanned on both side plates (not shown), and a carriage 15 is held on the guide rod 13 and the guide rail 14 so as to be slidable in the direction of arrow A in the figure. ing.

  The carriage 15 is mounted with a liquid ejection head that ejects ink droplets of each color of black (K), yellow (Y), magenta (M), and cyan (C). Although not shown, each recording head is integrally provided with a sub tank that supplies ink to each recording head. The main scanning mechanism that moves and scans the carriage 15 is disposed on one side in the main scanning direction, a driving pulley 22 that is rotationally driven by the driving motor 21, and on the other side in the main scanning direction. A driven pulley 23 and a belt member 24 wound around the drive pulley 22 and the driven pulley 23 are provided.

  The driven pulley 23 is tensioned outward (in a direction away from the drive pulley 22) by a tension spring (not shown). The belt member 24 pulls the carriage 15 in the main scanning direction (in the direction of arrow A in the figure) by being partly fixed and held by a belt fixing portion provided on the back side of the carriage 15.

  An encoder sheet (not shown) for detecting the main scanning position of the carriage 15 is arranged along the main scanning direction of the carriage 15, and the encoder sheet is read by an encoder sensor (not shown) provided on the carriage 15. It is supposed to be.

  Among the main scanning areas in the carriage 15, in the recording area, the paper 30 is intermittently moved in the direction orthogonal to the main scanning direction of the carriage 15 (sub-scanning direction: direction B in the figure) by the paper suction and conveyance unit 3. Be transported. Further, a maintenance / recovery mechanism 18 for performing maintenance / recovery of each recording head is disposed in one end side region of the main scanning region. Further, a main cartridge 19 containing ink of each color to be supplied to the sub-tank of the recording head is attached to the recording apparatus main body 1 outside the carriage movement area in the main scanning direction or in the other end side area of the main scanning area. On the other hand, it is detachably attached.

  The roll paper storage unit 4 shown in the figure constitutes a so-called paper feeding means, and roll paper (paper) 30 is set, but roll papers having different sizes in the width direction (direction A in the figure) can be set. . The roll paper 30 is attached to the apparatus main body by attaching a flange 31 as a holding member to the paper shaft from both sides. The flange 31 is rotatably supported on the main body side of the image forming apparatus by a bearing or the like (not shown), and the roll paper 30 is fed as the flange 31 rotates. In the figure, reference numeral 32 denotes a support member that supports the lower side of the roll paper 30 in the roll paper storage unit 4. In the following description, the roll paper 30 or the paper 30 is described as necessary.

  In this recording apparatus, the sheet 30 conveyed from the roll paper container 4 is conveyed from the rear side of the recording apparatus main body 1 to the front side in FIG. 2 by a conveying means (a roller pair 33, a registration roller 34 as a conveying roller, and It is conveyed to the recording area by a resist pressure roller 35). Then, by moving the carriage 15 in the main scanning direction and intermittently feeding the paper 30, the recording head is driven according to the image information to discharge droplets, thereby forming a required image on the paper 30. . Further, the paper 30 after the image formation is cut to a predetermined length and discharged to a paper discharge tray (not shown) disposed on the front side of the apparatus main body 1.

  FIG. 3 is a perspective view showing the configuration of the flange 31. The flange 31 includes a shaft core portion 40 for supporting the roll paper 30 in contact with the inner periphery of the core tube of the roll paper 30. The shaft core portion 40 includes a cylindrical portion 41 fitted to the end portion of the shaft member 36 that constitutes the spool together with the flange 31, and a guide guide that protrudes in the radial direction on the outer periphery of the cylindrical portion 41 and abuts against the inner surface of the core tube of the roll paper 30. 42 and a plurality of elastic members 43 arranged between the guides 34. The elastic member 43 can be deformed in the radial direction of the roll paper 30. The flange 31 has a plurality of recesses 44 formed on the surface on the shaft core portion 40 side, and support members 45 that are rotatable between the shaft core portion 40 and the recesses 44 are arranged in the inside thereof. It is. In addition, the rotation fulcrum of the support member 45 is provided in the recessed part 44 (refer FIG. 6, FIG. 7 mentioned later). In addition, each member constituting the shaft core portion 40 may be either an integral configuration or a separate configuration.

  FIG. 4 is a perspective view when the flange 31, the shaft member 36 constituting the spool, and the roll paper 30 are attached. The flange 31 has two types, a side fixed to the shaft member 36 and a side movable in the axial direction of the shaft member 36. The fixed side flange 31a is fixed to the shaft member 36, but the movable side flange 31b. Is movable in the thrust direction of the shaft member 36 according to the size of the roll paper 30, that is, in the axial direction.

  FIG. 5 is a side view of the state in which the flange 31 is fitted to the core tube 30 a of the roll paper 30. Since the rib-shaped guide guide 42 provided in the shaft core portion 40 is provided so as to be in contact with the core tube 30a, the work of attaching the roll paper 30 to the flange 31 is facilitated. Further, the deviation between the center of the roll paper 30 and the center of the shaft member 36 can be suppressed, and further, the elastic member 43 can be prevented from being deformed more than necessary.

  FIG. 6 is a cross-sectional view showing a state in which the movable flange 31b is attached to the roll paper 30 having a small inner diameter of the core tube 30a. As shown in FIG. 6, the distal end side of the elastic member 43 (left side in the figure: most part of the elastic member 43) is positioned between the guide guides 34 and contacts the inner peripheral surface of the core tube 30 a of the roll paper 30. The contact tube is deformed in the radial direction of the core tube 30a, and the reaction force causes contact pressure on the inner peripheral surface of the core tube 30a of the roll paper 30 (indicated by small arrows described so that force is applied in the opposite direction in the figure). Is supposed to give.

  On the other hand, the base end side of the elastic member 43 (the right side portion in FIG. 6: the small diameter and the axial direction length of the shaft member 36 is short) is also deformed in the radial direction so that a contact pressure is applied to the shaft member 36. (Indicated by small arrows in the figure so as to apply a force in the opposite direction). In the illustrated example, a friction member 46 such as rubber is attached to the base end of the flange 31 so that slip can be prevented even if the shaft member 36 is made of a slippery material such as metal.

  As described above, the flange 31 can be attached to the shaft member 36 to which the flange 31 is attached without generating thrust backlash, and the axial movement of the shaft member 36 of the flange 31 is prevented, thereby rotating and supporting the roll paper 30. The driving force can be smoothly transmitted to the roll paper 30 by the rotation of the shaft member 36.

  FIG. 7 is a cross-sectional view showing a state in which the core tube 30 a of the roll paper 30 having a large inner diameter is attached to the flange 31. As shown in FIG. 7, in the case of FIG. 6, the support member 45 that is left in the concave portion 44 of the flange 31 is turned and tilted, and the elastic member 43 is put on the outer periphery of the elastic member 43. The outer peripheral surface is deformed in the radial direction of the core tube 30 a by contacting the inner peripheral surface of the core tube 30 a of the roll paper 30, and the reaction force is applied to the inner peripheral surface of the core tube 30 a of the roll paper 30. Is supposed to give. Note that the base end side of the elastic member 43 applies a contact pressure to the shaft member 36 as in the case of FIG. Further, by deforming the elastic member 43 using the support member 45, it is possible to cope with a difference in inner diameter of the core tube 30a of the roll paper 30.

<Example 2>
FIG. 8 is a sectional view showing Example 2 of the present invention. In the present embodiment, the release member 50 for removal is provided on the flange 31 so that the shaft core portion 40 can be easily removed from the shaft member 36 by scanning from the outside of the flange 31. The distal end of the release member 50, that is, the distal end of the roll paper 30 that enters the core tube 30 a is a slope portion of the proximal end portion of the elastic member 43 (a portion that connects the large diameter distal end portion and the small diameter proximal end portion). It is attached to be caught. The attachment form of the distal end of the release member 50 to the proximal end portion of the elastic member 43 can be various forms such as not only hooking but also fixing. Further, the proximal end of the release member 50, that is, the portion located outside the flange 31 is a flange 51 having a diameter larger than that of the distal end side, as shown in FIG. 31 is sufficient if it protrudes in the outer peripheral direction.

  8A, the release member 50 is attached to the flange 31, and the tip of the release member 50 is only caught by the proximal end portion of the elastic member 43. From this state, the projection 51 When the release member 50 is pulled out while holding the elastic member 43, the elastic member 43 is pulled by the release member 53. Then, the elastic member 43 is deformed, and the flange 31 and the shaft core portion 40 are moved against the contact pressure acting between the inner peripheral surface of the core tube 30a of the roll paper 30 and the outer peripheral surface of the elastic member 43. It can be easily pulled out from the core tube 30a of the roll paper 30 (see FIG. 8B). Although illustration is omitted, the same applies even when the support member 45 is used as in the example of FIG.

1: recording apparatus body 2: image forming unit 3: paper suction conveyance unit 4: roll paper storage unit 13: guide rod 14: guide rail 15: carriage 18: maintenance / recovery mechanism 19: main cartridge 21: drive motor 22: drive pulley 23: driven pulley 24: belt member 30: roll paper (paper)
30a: roll paper core tube 31, 31a, 31b: flange 32: support member 33: roller pair 34: registration roller 35: registration pressure roller 36: shaft member 40: shaft core portion 41: tube portion 42: guide guide 43 : Elastic member 44: Recess 45: Support member 46: Friction member 50: Release member

JP 2000-095397 A Japanese Patent No. 3772057

Claims (7)

A roll-shaped recording medium holding mechanism for holding a roll-shaped recording medium on a spool,
A holding member for supporting the spool so as to be movable in the axial direction of the spool;
An elastic member attached to the holding member and deformable in a radial direction in a roll shape of the recording medium;
In a roll-shaped recording medium holding mechanism comprising:
In a state where the roll-shaped recording medium is attached to the shaft member, the elastic member abuts against the shaft member together with the inner peripheral surface of the core tube of the roll-shaped recording medium to give a contact pressure, and the holding member The movement of the shaft member in the axial direction can be restricted,
A roll-shaped recording medium holding mechanism. The roll-shaped recording medium holding mechanism according to claim 1,
A friction member is provided at a portion where the elastic member contacts the shaft member,
The friction member is in contact with the shaft member to increase the restriction force of the holding member in the axial direction movement,
A roll-shaped recording medium holding mechanism. In the roll-shaped recording medium holding mechanism according to claim 1 or 2,
A rib-shaped guide guide is provided on the outer periphery of the holding member.
A roll-shaped recording medium holding mechanism. In the roll-shaped recording medium holding mechanism according to claim 3,
A plurality of the rib-shaped guide guides,
The elastic member is disposed between the plurality of guides,
A roll-shaped recording medium holding mechanism. In the roll-shaped recording medium holding mechanism according to any one of claims 1 to 4,
It is attached to the elastic member so that it can be operated from the outside of the holding member, and the holding member can be taken out from the spool by an external operation.
A roll-shaped recording medium holding mechanism.   6. A roll paper feeding device using the roll-shaped recording medium holding mechanism according to claim 1. An image forming apparatus comprising the roll-shaped recording medium holding mechanism according to claim 1 or the roll sheet feeding device according to claim 6.