JP2021080035A - Roll-formed recording medium-retaining mechanism and image forming apparatus - Google Patents

Abstract

To improve the workability of pullout actions of a retaining member from a spool.SOLUTION: A roll paper retaining mechanism 30, for retaining a roll-formed recording medium on a shaft member 31, comprises the shaft member 31, a flange 32, 33 that abuts against one end side of roll paper 10 in a width direction and retains the roll paper 10, and a press member 35 that is for pushing the roll paper 10 toward the other side in the width direction. The flange 32, 33 is provided attachably/detachably with respect to the shaft member 31, and the press member 35 has a pressure-application operating part capable of applying pressure from one side in the width direction and a pressing part that is provided at the other side in the width direction and abuts against the roll paper 10 and pushes the roll paper 10. The flange 32, 33 has a recess 32a that is provided in the width direction on a surface facing the roll paper 10 and opened at an outer peripheral surface side of the flange 32, 33.SELECTED DRAWING: Figure 7

Description

The present invention relates to a roll-shaped recording medium holding mechanism and an image forming apparatus.

In an image forming apparatus for forming an image on a roll-shaped recording medium such as roll paper, a roll-shaped recording medium holding mechanism for holding the roll paper on a spool and accommodating it in the apparatus is provided.

In such a roll-shaped recording medium holding mechanism, when replacing the roll paper, it is first necessary to pull out a holding member such as a flange that contacts one end of the roll paper in the width direction and holds the roll paper from the spool. become. However, since the roll paper and the holding member are in close contact with each other, it is not possible to insert a finger between them, and it is difficult to apply a force in the pulling direction to the holding member. Was there.

On the other hand, for example, in the roll-shaped recording medium holding mechanism of Patent Document 1 (Japanese Unexamined Patent Publication No. 2012-66932), as shown in FIG. 13, the width of the shaft member 202 into which the roll paper 201 is inserted and the width of the roll paper 201. It has a flange 203 that holds one end in the direction, an elastic member 204 that is provided between the shaft member 202 and the roll paper 201, and a release member 205 that has one end attached to the elastic member 204. When replacing the roll paper 201, the flange 203 can be pulled out from the shaft member 202 together with the elastic member 204 by pulling the release member 205 in the direction of the arrow in the figure.

In Patent Document 1, the elastic member is pressure-welded between the shaft member and the roll paper, and a large force is required to pull out the elastic member, or the pressure-contact force is released when the elastic member separates from the roll paper. As a result, the elastic member suddenly pops out in the pulling direction, and there is a problem in the workability of the pulling operation of the holding member with respect to the spool.

In order to solve the above problems, the present invention is a holding member that abuts the spool and one end side of the roll-shaped recording medium inserted in the spool in the width direction and holds the roll-shaped recording medium from one end side in the width direction. A roll-shaped recording medium holding mechanism including a pressing member for pressing the roll-shaped recording medium to the other side in the width direction, wherein the holding member is provided so as to be movable in the axial direction of the spool. The pressing member includes a pressurizing operation unit that can pressurize from one side in the width direction and a pressing unit that is provided on the other side in the width direction and abuts on the roll-shaped recording medium to press the roll-shaped recording medium. The holding member is a roll-shaped recording medium holding mechanism provided on the roll-shaped recording medium side in the width direction and having a recess opened on the outer peripheral surface side of the holding member.

According to the present invention, the workability of the pulling operation of the holding member from the spool can be improved.

It is a perspective view which shows the schematic structure of the image forming apparatus. It is a schematic side view which shows the image forming apparatus. It is a perspective view which shows the roll paper holding mechanism in the state which does not hold a roll paper. It is a perspective view which shows the roll paper holding mechanism in the state which holds the roll paper. It is a figure which shows the one end side in the width direction of a roll paper holding mechanism. It is a figure which shows the one end side in the width direction of a roll paper holding mechanism. It is a perspective view which shows the roll paper holding mechanism which concerns on 1st Embodiment of this invention, (a) figure shows one side in the width direction of a flange, (b) figure shows the other side in the width direction of a flange. is there. It is a perspective view which shows the roll paper holding mechanism which concerns on 2nd Embodiment of this invention. Is. It is a perspective view which shows how the pressing member presses a roll paper. It is a perspective view which shows the roll paper holding mechanism which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the roll paper holding mechanism which concerns on 4th Embodiment of this invention. It is a perspective view which shows the roll paper holding mechanism which concerns on 5th Embodiment of this invention, (a) is a state before pressing a roll paper, (b) is a figure which shows the state which presses a roll paper. is there. It is a figure which shows the conventional roll-shaped recording medium holding mechanism.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the duplicated description thereof will be appropriately simplified or omitted.

FIG. 1 is a perspective explanatory view showing the overall configuration of the inkjet image forming apparatus, and FIG. 2 is a schematic side explanatory view of the apparatus. The illustrated inkjet image forming apparatus is a serial type inkjet image forming apparatus, and an image forming portion 2, a paper suction conveying portion 3, a roll paper accommodating portion 4, and the like are arranged inside the image forming apparatus main body 1. In the image forming portion 2, a guide rod 13 and a guide rail 14 are hung on both side plates, and a carriage 15 is slidably held on the guide rod 13 and the guide rail 14 in the direction of arrow A in the drawing.

As shown in FIGS. 1 and 2, the carriage 15 is equipped with a liquid ejection head that ejects ink droplets of each color of black (K), yellow (Y), magenta (M), and cyan (C). Each recording head is integrally provided with a sub tank that supplies ink to each recording head. The main scanning mechanism for moving and scanning the carriage 15 is a drive motor 21 arranged on one side in the main scanning direction, a drive pulley 22 rotationally driven by the drive motor 21, and arranged on the other side in the main scanning direction. A driven pulley 23 and a belt member 24 hung between the driven 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. A part of the belt member 24 is fixedly held by a belt fixing portion provided on the back side of the carriage 15, so that the carriage 15 is pulled in the main scanning direction (direction of arrow A in the drawing).

Further, an encoder sheet 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 the encoder sensor provided on the carriage 15.

Of the main scanning area of the carriage 15, in the recording area, the paper 10 is intermittently conveyed by the paper suction and conveying unit 3 in a direction orthogonal to the main scanning direction of the carriage 15 (sub-scanning direction: arrow B in the drawing). Will be done. Further, a maintenance / recovery mechanism 18 for maintaining / recovering each recording head is arranged in one end side region of the main scanning region. Further, outside the carriage moving region in the main scanning direction, or in the other end side region of the above-mentioned main scanning region, a main cartridge 19 containing inks of each color supplied to the sub tank of the recording head is provided in the image forming apparatus main body 1. It is detachably attached to the.

The roll paper accommodating portion 4 provided in the lower part of the apparatus main body 1 constitutes a so-called paper feeding means, and the roll paper (paper) 10 as a roll-shaped recording medium is set. The roll paper accommodating portion 4 can set roll paper having different sizes in the width direction (direction of arrow A in the drawing).

The roll paper accommodating unit 4 has a roll paper holding mechanism 30 as a roll-shaped recording medium holding mechanism for holding the roll paper 10 at a predetermined position in the roll paper accommodating unit 4. A flange provided on the roll paper holding mechanism 30 holds the roll paper 10, and the flange rotates to feed the roll paper 10. The support member 41 supports the roll paper 10 from below in the roll paper accommodating portion 4. In the following, it will be referred to as roll paper 10 or paper 10 as necessary.

In this image forming apparatus, the paper 10 conveyed from the roll paper accommodating portion 4 is conveyed from the rear to the front of the paper surface of FIG. 2 of the image forming apparatus main body 1 toward the conveying means (roller pair 25, resist roller which is a conveying roller). 26, resist pressurizing roller 27, etc.) to convey to the recording area. Then, the carriage 15 is moved in the main scanning direction, the paper 10 is intermittently fed, and the recording head is driven according to the image information to eject the droplets, thereby forming a required image on the paper 10. .. Further, the paper 10 after image formation is cut to a predetermined length and discharged to a paper ejection tray arranged on the front side of the apparatus main body 1.

Next, the roll paper holding mechanism 30 for holding the roll paper 10 provided in the roll paper accommodating portion 4 will be described. Note that, in FIGS. 3 to 6, for convenience, the configurations of the flange 32 and its surroundings are simplified.

As shown in FIG. 3, the roll paper holding mechanism 30 includes a shaft member 31 constituting the spool, flanges 32 and 33 as holding members provided on one side and the other side of the shaft member 31 in the axial direction, respectively. It has a drive unit 34. In the present embodiment, the axial direction of the shaft member 31 is the same as the width direction of the roll paper 10 (the direction perpendicular to the paper surface in FIG. 2), and hereinafter, this direction is also simply referred to as the width direction.

As shown in FIG. 4, the flanges 32 and 33 are inserted into one side and the other side in the axial direction of the shaft member 31, so that the flange 32 and 33 are inserted into the paper tube portion of the roll paper 10 into which the shaft member 31 is inserted. The roll paper 10 can be held from both sides in the width direction by abutting from both sides in the direction. The flanges 32 and 33 are rotatably supported on the device main body side of the image forming apparatus by bearings or the like.

One flange 32 is provided so as to be movable with respect to the shaft member 31 in both axial directions (the arrow C1 direction which is the removal direction and the arrow C2 direction which is the insertion direction), and is detachable from the shaft member 31. can do. The other flange 33 is fixed to the shaft member 31.

The driving unit 34 is provided at the other end of the shaft member 31 in the axial direction, and transmits the driving force to the flange 33. The drive unit 34 may be a drive source such as a motor, or may be a drive gear as a drive transmission member connected to the drive source and transmitting a drive force from the drive source.

When the drive unit 34 transmits its own driving force to the flange 33, the flange 33, the roll paper 10 held by the flange 33, and the flange 32 rotate with respect to the shaft member 31 (in the figure of FIG. 4). (See arrow D), the roll paper 10 is fed to the image forming apparatus main body side. The flange 33 holds the other end side of the roll paper 10 inserted into the shaft member 31 in the width direction, and the driving force of the drive unit 34 is transmitted to the roll paper 10 through the flange 33, so that the drive unit 34 It is possible to prevent slipping.

Next, a procedure for setting and holding the roll paper 10 in the roll paper holding mechanism 30 will be described.

First, the flange 32 is moved in the direction of arrow C1 from the state of FIG. 3 to be removed from the shaft member 31, and then the shaft member 31 is inserted into the hollow portion provided in the core tube of the roll paper 10 (see FIG. 4). Then, the roll paper 10 is moved to a position where the other end side in the width direction comes into contact with the flange 33, and the roll paper 10 is set in the roll paper holding mechanism 30. Next, as shown in FIG. 4, the flange 32 is inserted into the shaft member 31 and moved in the direction of arrow C2, and is brought into contact with one end side in the width direction of the roll paper 10 to hold one end side in the width direction of the roll paper 10. Let me. When the flange 32 is moved in the direction of arrow C2, the guide portion 32d (see FIG. 3) of the flange 32 slides with respect to the inner peripheral surface of the roll paper 10, so that the flange 32 is correctly guided in the direction of arrow C2. And abuts on the roll paper 10. As described above, the roll paper 10 is held by the roll paper holding mechanism 30.

Further, when the number of roll papers 10 is reduced or when printing is to be performed with roll papers 10 of different sizes, the roll papers 10 are removed from the roll paper holding mechanism 30 by the reverse operation of the above-described operation, and new roll papers 10 are used. Replace with. Specifically, after the flange 32 is removed from the shaft member 31, the roll paper 10 is pulled out from the shaft member 31, and the new roll paper 10 is held by the roll paper holding mechanism 30 again in the above procedure.

The above attachment / detachment operation of the flange 32 and the roll paper 10 is performed manually. Among these operations, the workability of removing the flange 32 from the shaft member 31 becomes a problem. In a series of operations, it is necessary to first separate the flange 32 from the roll paper 10 and then pull it out from the shaft member 31.

As shown in FIG. 5, when the roll paper 10 is to be replaced while the outer diameter E1 of the roll paper 10 is larger than the outer diameter E2 of the flange 32, that is, when the roll paper 10 still remains sufficiently. When replacing, since there is almost no gap between the flange 32 and the end face of the roll paper 10, it is not possible to insert a finger between them to grip the roll paper 10 side of the flange 32, and the flange 32 is used as an axis. It becomes difficult to pull out from the member 31.

Further, as shown in FIG. 6, when the outer diameter E3 of the roll paper 10 is smaller than the outer diameter E2 of the flange 32, the end face of the flange 32 on the roll paper 10 side (for example, of the end faces, the upper side of the drawing). The flange 32 can be pulled out from the shaft member 31 by grasping the portion F1 and the lower portion F2).

However, in order to pull out the flange 32, a force in the pulling direction is applied to the flange 32 while holding the roll paper 10 or the shaft member 31 with one hand, and the flange 32 is pulled out with respect to the roll paper 10 or the shaft member 31. It was necessary to move it relative to the flange 32, and it was necessary to apply a force in the pulling direction to the flange 32 with only one hand. In this respect, in the present embodiment, since the roll paper holding mechanism is compatible with A0 paper having a width of 841 mm, the outer diameter E2 of the flange 32 is set as large as 150 mm, and it is difficult to pull out the flange 32. there were. That is, in order to appropriately apply the force in the pulling direction to the flange 32, it is necessary to apply the force evenly on both sides of the shaft member 31. For example, it is necessary to apply the force G1 and the force G2 in the pulling direction evenly to the part F1 and the part F2 in the figure, respectively, but as described above, the forces G1 and G2 can be applied to the large flange 32 at the same time with only one hand. Was difficult. In particular, the flange 32 is on the inner peripheral surface side of the roll paper 10 in the width direction, such as providing a guide portion 32d (see FIG. 3) and an elastic member between the flange 32 and the inner peripheral surface side of the roll paper 10. When the flange 32 is in contact with the roll paper 10, a sliding resistance is generated between the flange 32 and the roll paper 10, so that a large force is required for the pulling operation, and the flange 32 is released from the attached state to the roll paper 10. Was particularly difficult.

As described above, regardless of whether the outer diameter of the roll paper 10 is larger or smaller than the outer diameter of the flange 32, the workability of the pulling operation of the flange 32 from the shaft member 31 becomes an issue. On the other hand, in the present embodiment, the workability of the pulling-out operation of the flange 32 is improved by the configuration shown below.

As shown in FIGS. 7 (a) and 7 (b), the flange 32 is a member having a substantially circular cross section, and is a surface facing the roll paper 10 on the other side in the width direction. Recesses 32a are provided at four locations in the direction. Further, the flange 32 is provided with an insertion portion 32b protruding to one side in the width direction.

As shown in FIG. 7B, the recess 32a is a portion that is provided in a concave shape on one side in the width direction when viewed from the other side in the width direction and opens to the outer peripheral surface side of the flange 32. Further, as shown in FIG. 7A, when viewed from one side in the width direction, the recess 32a, the insertion portion 32b, and the outer peripheral end portion of the flange 32 project from the other portion toward one side in the width direction. ing.

Two insertion portions 32b are provided at different positions in the circumferential direction of the flange 32. The insertion portion 32b has a hollow rectangular parallelepiped shape, and the hollow portion is a hole portion 32b1 penetrating the other side in the width direction of the flange 32.

On the other side of the flange 32 in the width direction, a hollow cylindrical cylindrical portion 32c into which the shaft member 31 is inserted on the inner peripheral surface side thereof, and a plurality of guide portions 32d on the outer peripheral surface side of the cylindrical portion 32c are provided. (See Fig. 3). A plurality of guide portions 32d (six in the present embodiment) are provided in the circumferential direction of the cylindrical portion 32c.

As shown in FIG. 7A, the flange 32 of the present embodiment is provided with the pressing member 35. The pressing member 35 is a long rod-shaped member, is inserted into the hole portion 32b1 provided in each insertion portion 32b, penetrates the hole portion 32b1, and is provided so as to project from the flange 32 to one side in the width direction.

In the present embodiment, two pressing members 35 are provided, and are arranged symmetrically with respect to the center position of the flange 32 (the center of the virtual circle of the substantially circular portion) on the plane orthogonal to the axial direction of the shaft member 31. Has been done. However, three or more pressing members 35 may be provided, or one pressing member 35 may be provided.

One end in the width direction of the pressing member 35 is a pressurizing operation portion to which a pressing force is applied by an operator. The other end of the pressing member 35 in the width direction is a pressing portion that abuts on one end surface of the roll paper 10 in the width direction and presses the roll paper 10. The recess 32a of the flange 32 is provided on the other side in the width direction from the pressurizing operation portion of the pressing member 35 in the width direction.

As an example of the operation when the flange 32 is removed from the shaft member 31, the index fingers of both hands grasp the different recesses 32a from one side in the width direction, and each thumb holds one end in the width direction of each pressing member 35 (pressurization operation). (Part) is pressurized (see the arrow H direction in FIG. 7a). By this operation, the other end portion (pressing portion) in the width direction of the pressing member 35 abuts on the roll paper 10 to press one end surface in the width direction of the roll paper 10, and a force in the pulling direction is applied to the recess 32a. As a result, as shown in FIG. 7B, the flange 32 can be separated from the roll paper 10 and removed from the roll paper 10. Then, by further applying a force in the pulling direction to the recess 32a, the flange 32 can be moved in the direction of the arrow C1 and pulled out from the shaft member 31.

As described above, in the present embodiment, the flange 32 can be separated from the roll paper 10 by applying a force in the pulling direction while the pressing member 35 presses the roll paper 10. That is, it is not necessary to pull out the flange 32 while holding the roll paper 10 with one hand, and the flange 32 can be pulled out while being grasped by both hands, and the workability thereof can be improved. In particular, by enabling the operation with both hands in this way, even if the flange 32 is large, the pressing member 35 simultaneously presses the roll paper 10 at a plurality of locations and pulls out the flange 32 at a plurality of locations at the same time. The force of can be applied. Therefore, on both sides of the center position of the flange 32 (on the plane orthogonal to the width direction, on both sides of the circular center of the flange 32, for example, the side of F1 which is the upper side of FIG. 6 and the side of F2 which is the lower side. A force can be applied to the side), and a force in the pulling direction can be appropriately applied without tilting the flange 32 with respect to the shaft member 31. Therefore, the flange 32 can be easily pulled out from the shaft member 31, and the workability thereof can be improved.

In particular, in the present embodiment, a plurality of pressing members 35 are provided at symmetrical positions with respect to the circular center of the flange 32. As a result, the pressing force on the roll paper 10 by the pressing member 35 and the force applied to the flange 32 in the pulling direction can be applied evenly to both sides of the center position of the flange 32, which is more preferable.

Next, a modification of the pressing member will be described in order. In the following description, the points different from the above-described embodiment will be mainly described, and the description thereof will be omitted as appropriate for the same parts.

As shown in FIGS. 8A and 8B, in the second embodiment, the portion 35a protruding from the flange 32 on one side in the width direction of the pressing member 35 (pressurization on one end side in the width direction of the pressing member 35). The portion including the operation portion) can be bent around the rotation shaft 35b in a direction intersecting the projecting direction. As an example, as shown in FIG. 8A, the protruding portion 35a can be bent to an angle of 90 degrees with respect to the protruding direction.

In the present embodiment, the protrusion 35a can be bent so that the protrusion 35a can be compactly accommodated except when the flange 32 is pulled out, and the roll paper holding mechanism can be saved in space.

As shown in FIG. 8B, when the pressing member 35 is pressed to pull out the flange 32 from the shaft member 31, the protruding portion 35a is first raised. Then, as shown in FIG. 9, as in the above-described embodiment, the pressing member 35 is pressed in the direction of the arrow H, the recess 32a is gripped, and a force in the pulling direction is applied to the flange 32 to shaft the flange 32. It can be pulled out from the member 31.

Next, as shown in FIG. 10, in the third embodiment of the present invention, the pressing member 35 has a roll paper pressing member 36 as a pressing portion for pressing the roll paper and a plurality of extending portions 351.

The extending portion 351 is a rod-shaped member extending in the width direction and projecting from the flange 32 to one side and the other side in the width direction, and is a member corresponding to the pressing member 35 (see FIG. 7a) of the above-described embodiment. However, the difference is that the other side in the width direction does not come into direct contact with the roll paper 10. It is the same as the above-described embodiment in that one side of the extending portion 351 in the width direction forms a pressurizing operation portion in which the pressure is applied by the operator.

The roll paper pressing member 36 has an annular shape in the present embodiment. The roll paper pressing member 36 is connected to the other end of each extending portion 351 in the width direction.

The procedure for pulling out the flange 32 is the same as that of the above-described embodiment. That is, it is performed by grasping the recess 32a of the flange 32 and pressurizing one end in the width direction of each extending portion 351.

During the above operation, in the present embodiment, the roll paper pressing member 36 presses the end face of the roll paper instead of the extending portion 351. Compared with the case where the plurality of pressing members 35 each press the roll paper, the roll paper pressing member 36 connected to each extending portion 351 presses the roll paper as in the present embodiment, so that the pressing state is changed. Stabilize. That is, it is possible to prevent the pressing force from becoming non-uniform on the upper side and the lower side due to strong pressing on only one side of the flange 32, for example, the upper side in the drawing of the flange 32. Further, it is not necessary to pull out the flange 32 while holding the roll paper 10 or the shaft member 31 with one hand, and the flange 32 can be pulled out while being grasped by both hands. Therefore, the roll paper 10 can be appropriately pressed, and the workability of the pulling-out operation of the flange 32 is improved. In particular, by forming the roll paper pressing member 36 in an annular shape, the pressing force transmitted from the extending portion 351 can be made uniform in the circumferential direction, which is more preferable.

Next, as shown in FIG. 11, in the fourth embodiment of the present invention, the pressing member 35 has a plurality of extending portions 351 and a pressurizing operating member 37 as a pressurizing operating portion.

A hollow cylindrical cylindrical portion 32e is provided so as to project on one side of the flange 32 in the width direction. The hollow portion of the cylindrical portion 32e is a hole portion that communicates with the cylindrical portion 32c (see FIG. 10) on the other side in the width direction and penetrates from one side to the other side in the width direction. A shaft member 31 (see FIG. 9) is inserted into this hole.

The pressurizing operation member 37 has an annular shape and has a hole in the center of which the cylindrical portion 32e is inserted.

The pressurizing operation member 37 is connected to one end in the width direction of each extending portion 351 (four extending portions 351 in this embodiment). In the present embodiment, the pressing member 35 can press the end surface of the roll paper by pressurizing the pressurizing operation member 37 connected to the extending portion 351 instead of the pressing member 35 (see FIG. 7a).

The point that the other end of the extending portion 351 in the width direction is a pressing portion for pressing the roll paper 10 is the same as that of the embodiment shown in FIG. 7. However, the pressing member 35 may be formed by combining the pressurizing operation member 37 as the pressurizing operation unit, the roll paper pressing member 36 (see FIG. 10) as the pressing unit, and the plurality of extending portions 351. it can.

As shown in FIG. 11, as an example of the procedure for pulling out the flange 32, each recess 32a of the flange 32 is grasped by both index fingers and the pressurizing operation member 37 is pressurized.

In the present embodiment, by pressurizing the pressurizing operation member 37, the pressing force can be transmitted to all the extending portions 351 to press the roll paper 10, so that the pressing operation on the roll paper 10 becomes easy. , It is possible to prevent the pressing force on the roll paper 10 from being biased to one side with respect to the circular center of the flange 32. Therefore, the workability of the pulling-out operation of the flange 32 can be improved. In particular, by forming the pressurizing operation member 37 in an annular shape, it is possible to evenly transmit the pressing force to each extending portion 351 arranged in the circumferential direction and suppress the bias of the pressing force, which is more preferable.

Further, since it is possible to transmit the pressing force to the plurality of extending portions 351 at once only by pressurizing the pressurizing operation member 37, more (four in the present embodiment) extending portions 351 can simultaneously transmit the pressing force. It becomes possible to press the roll paper 10. Therefore, the pressing force on the roll paper 10 can be made more uniform in the circumferential direction. Further, it is not necessary to pull out the flange 32 while holding the roll paper 10 with one hand, and the flange 32 can be pulled out while being grasped by both hands. As described above, the workability of the pulling operation of the flange 32 from the shaft member 31 can be improved.

Next, as shown in FIG. 12A, in the fifth embodiment of the present invention, the pressing member 35 includes a plurality of extending portions 351 and an annular connecting member 38, and a rotating member as a pressurizing operation portion. It has 39 and.

The connecting member 38 has a cylindrical portion 32e inserted into a hole on the inner peripheral surface side thereof. One end of each extending portion 351 (four extending portions 351 in the present embodiment) in the width direction is connected to the connecting member 38 in the width direction with respect to the flange 32 together with the extending portion 351. It can be moved relative to each other.

In this embodiment, a screw portion is provided on the outer diameter side of the cylindrical portion 32e.

The rotating member 39 is a hollow cylindrical member having a screw portion screwed with a screw portion of the cylindrical portion 32e on the inner peripheral surface side thereof. Further, the other end of the rotating member 39 in the width direction is in contact with the connecting member 38.

By rotating the rotating member 39 in the direction of arrow J, the threaded portion of the rotating member 39 moves along the threaded portion of the cylindrical portion 32e, and the rotating member 39 and the connecting member 38 abuting on the rotating member 39 come into contact with each other. Each extending portion 351 to be connected can be moved with respect to the flange 32 in the direction of the arrow K.

The point that the other end of the extending portion 351 in the width direction is a pressing portion for pressing the roll paper 10 is the same as that of the embodiment shown in FIG. 7.

In the present embodiment, by rotating the rotating member 39 in the arrow J direction, the rotating member 39, the connecting member 38, and the extending portion 351 connected to the rotating member 39 can be moved in the arrow K direction with respect to the flange 32. .. By this movement, the other end of the extending portion 351 in the width direction can press the roll paper 10. Similar to the first embodiment shown in FIG. 7, the flange 32 is separated from the roll paper 10 by pressing the roll paper 10 and applying a force in the direction of grasping the recess 32a and pulling it out to the flange 32, and the shaft member. It can be pulled out from 31.

Further, when the flange 32 is brought into contact with the one end surface of the roll paper 10 in the width direction to hold the roll paper 10, the rotating member 39 is rotated in the direction opposite to the arrow J direction, and the rotating member 39 is the roll paper 10. Move in the opposite direction. Further, the connecting member 39 is pushed back by the roll paper 10 and moves in the same direction as the rotating member 39. As a result, the flange 32 can be brought into contact with the roll paper 10.

In the present embodiment, a force in the pressurizing direction of the roll paper 10 can be applied to the plurality of extending portions 351 by the operation of rotating the rotating member 39. Therefore, the pressing operation against the roll paper 10 becomes easy, and it is possible to prevent the pressing force against the roll paper 10 from being biased to one side with respect to the circular center of the flange 32. Therefore, the workability of the pulling-out operation of the flange 32 can be improved. In particular, by forming the connecting member 38 in an annular shape, it is possible to evenly transmit the pressing force to each extending portion 351 arranged in the circumferential direction and suppress the bias of the pressing force, which is more preferable. In addition, more (four in this embodiment) extending portions 351 can simultaneously press the roll paper 10. Therefore, the pressing force on the roll paper 10 is made uniform in the circumferential direction.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

The image forming apparatus is not limited to the serial type image forming apparatus of the embodiment, and may be an image forming apparatus of any method and configuration. Of course, the plotter is not limited to a large format plotter, and may be a copier, a printer, a facsimile, or a multifunction device having a plurality of functions.

Recording media include paper (plain paper), cardboard, postcards, envelopes, thin paper, coated paper (coated paper, art paper, etc.), tracing paper, transparencies, plastic films, prepregs, copper foil, etc. Is done.

1 Image forming device 4 Roll paper accommodating part 10 Roll paper (roll-shaped recording medium)
30 Roll paper holding mechanism (roll-shaped recording medium holding mechanism)
31 Shaft member (spool)
32 Flange (holding member)
32a Recess 32b Insertion 32b1 Hole 33 Flange (holding member)
34 Drive part 35 Pressing member 351 Extension part 36 Roll paper pressing member (pressing part)
37 Pressurization operation member (pressurization operation unit)
38 Connecting member 39 Rotating member (pressurizing operation unit)

Japanese Unexamined Patent Publication No. 2012-66932

Claims (8)

With spool
A holding member that abuts on one end side of the roll-shaped recording medium inserted into the spool in the width direction and holds the roll-shaped recording medium.
A roll-shaped recording medium holding mechanism including a pressing member that presses the roll-shaped recording medium to the other side in the width direction.
The holding member is provided so as to be movable in the axial direction of the spool.
The pressing member includes a pressurizing operation unit that can be operated from one side in the width direction, and a pressing unit that is provided on the other side in the width direction and abuts on the roll-shaped recording medium to press the roll-shaped recording medium. And
The roll-shaped recording medium holding mechanism is characterized in that the holding member is provided on the roll-shaped recording medium side in the width direction and has a recess opened on the outer peripheral surface side of the holding member. A plurality of the pressing members are provided in the circumferential direction of the holding member.
The roll-shaped recording medium holding mechanism according to claim 1, wherein the plurality of pressing members are provided at positions symmetrical with respect to the center position of the holding member on a plane orthogonal to the width direction. The pressing member has extending portions extending in the width direction at a plurality of locations different in the circumferential direction of the holding member.
The roll-shaped recording medium holding mechanism according to claim 1, wherein the pressing portion is an annular portion extending in the circumferential direction in which the other ends in the width direction of the plurality of extending portions are connected. The pressing member has extending portions extending in the width direction at a plurality of locations different in the circumferential direction of the holding member.
The roll-shaped recording medium holding mechanism according to claim 1 or 3, wherein the pressurizing operation unit is an annular portion extending in the circumferential direction in which one end portion in the width direction of the plurality of extending portions is connected. The pressurizing operation portion can be screwed with a screw portion formed on the holding member, and is provided so as to be relatively movable in the width direction by rotating with respect to the holding member.
The roll-shaped recording medium holding mechanism according to claim 1 or 3, wherein the pressing portion moves integrally with the pressurizing operation portion in the width direction. The roll-shaped recording medium holding mechanism according to any one of claims 3 to 5, wherein the plurality of extending portions are provided at positions symmetrical with respect to the center position of the holding member on a plane orthogonal to the width direction. The roll-shaped recording medium holding mechanism according to any one of claims 1 to 3, wherein the pressurizing operation unit is provided so as to be bendable in a direction intersecting the width direction. An image forming apparatus having the roll-shaped recording medium holding mechanism according to any one of claims 1 to 7.

Images