JP2552404B2 - Roll paper support shaft structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a support shaft for supporting roll paper.

[0002]

2. Description of the Related Art Some image forming apparatuses such as copying machines and various other printing machines are designed to feed a long sheet of paper wound around a core tube, so-called roll paper. As a support shaft for supporting this roll paper, there are shown in FIG. 11 and FIG.
As shown in FIG. 2, flat plate-shaped supporting members 82 and 8 which inscribe and support the core tube 34 of the roll paper at three points in the axial direction.
There is a type in which the balancer 85 is fixed together with the cores 3 and 84 fixed to the cored bar (fixed shaft) 81.

[0003]

However, in the support shaft structure for roll paper, the number of parts is large, the assembly is troublesome, and the weight is large. In particular, the weight of the cored bar 81 is large, and it is necessary to reduce the weight of the cored bar 81.

Further, since the support members 82, 83, 84 are formed of flat plates, when the rotation speed of the core tube 35 changes with the start of feeding or the stop of rotation, the support members 82, 83, 8 are formed.
4 may bend in the rotation direction and the support position may deviate.
As a result, the roll paper is fed in a vibrating state, and there is a risk that the roll paper may jam.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a roll paper support shaft structure which is light in weight, has good assemblability, and has little bending in the rotational direction.

[0006]

In order to achieve the above object, the present invention relates to a roll paper support shaft structure inscribed in a roll paper core cylinder at three points as viewed in the axial direction. A first support member having first and second support pieces for supporting the core cylinder with a contact point and a second inner contact point; and a first inner contact point and a first inner contact point having the same shape as the first support member. A second support member having first and third support pieces for supporting the core cylinder with the inner contact points of 3, and short lengths provided at both longitudinal ends of the first and second support members, respectively. First and second
And a fixed shaft for fixing the supporting member of (1) to face each other.

According to a second aspect of the present invention, the first supporting member has a restricting piece that abuts against the first supporting piece of the second supporting member in the fixed state, and the second supporting member in the fixed state. The first support member has a restriction piece that comes into contact with the first support piece.

Further, according to a third aspect of the present invention, in the roll paper support shaft structure inscribed in the roll paper core tube at three points in the axial direction, the support shaft structure can be connected to and supported by one of the following first or second support members. A first support member having a first inner contact for supporting the core cylinder and a second support piece for supporting the core cylinder at a second inner contact; A second support member having the same shape as that of the first support member and having a third support piece for supporting the core tube at the third inner contact point; and a first support member and a second support member at both longitudinal ends of the first and second support members, respectively. A fixed shaft that is provided in a short dimension and that fixes the first and second support members so as to face each other.

According to a fourth aspect of the invention, in the roll paper support shaft structure according to the third aspect, there is provided an urging means for urging the first support piece against the first inner contact.

Further, in the present invention, the second supporting piece of the first supporting member is bent from the second inner contact and extends toward the third inner contact side, and the third supporting piece of the third supporting member is provided. The support piece is bent from the third inner contact and extended toward the second inner contact so that the extending ends of the supporting pieces contact each other.

[0011]

In the roll paper support shaft structure configured as described above,
By fixing two support members having the same shape so as to face two fixed shafts having short dimensions, the support shaft can be made lightweight and easily manufactured. And the first of the first support member
And the second support piece and the first and third support pieces of the second support member support the core cylinder of the roll paper at three points of the first, second, and third inner contact points in the axial direction. To be done.

Further, in the present invention, the restriction piece of the first support member restricts the bending of the first support piece of the second support member, and the restriction piece of the second support member restricts the first support member. The bending of the first support piece is restricted.

Further, according to the third aspect, by fixing two supporting members having the same shape so as to face two fixed shafts having short dimensions, the supporting shaft can be manufactured lightweight and easily. Then, the first support piece and the second of the first support member
The support tube and the third support piece of the second support member support the roll paper core cylinder at three points of the first, second, and third inner contacts in the axial direction.

Further, in claim 4, the first support piece is the first
It is pressed and urged by the inner contact of the roller to prevent the rolling of both sides of the roll paper in the radial direction of the core tube.

Further, according to the present invention, the extending end of the second supporting piece of the first supporting member restricts the bending of the second supporting member toward the second inner contact side, and the second supporting member. The extension end of the third support piece restricts the bending of the first support member toward the third inner contact side.

[0016]

FIG. 9 is a block diagram showing an example of a copying machine (image forming apparatus) to which a roll paper support shaft structure according to the present invention is applied, and FIG. 10 shows a roll paper for a roll paper feeding unit main body. It is a side view which shows attachment.

The copying machine main body 2 is mounted on the moving deck 1,
A roll paper feed unit 6 that cuts the roll paper 3 supported by a support shaft 24 into a predetermined length and feeds the cut paper 4 to a paper feed port 5 of the main body 2 is connected to the main body 2.

Further, the main body 2 has an exposure section 8 and a document conveying means 9 on the upper side of the apparatus case 7, and a paper feeding cassette 10 for storing a large standard paper on the lower side of the apparatus case 7 and a roll paper feeding unit 6. It is provided so that it can be pulled out to the side. A photoconductor drum 11 is arranged below the exposure unit 8, and a charging device 12, a developing device 13, a transfer device 14, a separating device 15, a cleaning device 16 and the like are provided along the rotation direction of the photoconductor drum 11. There is.

When the transfer operation is started, the light from the exposure section 8 is reflected by the document, and the photosensitive drum 11 is exposed by the reflected light. On the other hand, the surface of the photoconductor drum 11 is uniformly charged by the charging device 12, and an electrostatic latent image is formed by the above exposure. The electrostatic latent image is developed with toner by the developing device 13, and thereafter, the transfer device 14 is used.
Is transferred to the cut paper 4 or the fixed paper 4 or the like from the paper feed cassette 10 (hereinafter referred to as the cut paper 4) by
The separation device 15 separates the photosensitive drum 11.

A sheet passing guide 17 is provided upstream of the sheet feeding direction from the sheet feeding portion of the sheet feeding cassette 10 to the sheet feeding port 5, and the sheet feeding and conveyance is performed from the sheet feeding port 5 to the transfer device 14. A path 18 is provided so that the cut sheet 4 and the like are fed to the photosensitive drum 11 and transferred. A paper discharge conveyance path 19, a fixing device 20, and a paper discharge roller 21 are provided downstream of the transfer direction of the cut paper 4 after the transfer.

The roll paper feeding unit 6 is composed of a unit frame 22 mounted on the side of the paper feeding port 5 of the main body 2 and a paper feeding unit main body 23 which can be raised and lowered with respect to the unit frame 22. As shown in FIG. 10, an insertion guide 25 for a support shaft 24 that supports the roll paper 3 is formed in the paper feed unit main body 23, so that a loading portion for the roll paper 3 is configured. .

In the middle of the paper passage extending from the paper feed section above the loading section to the paper feed slot 5, the roll paper 3 is driven by the drive means (not shown). A pair of paper feed rollers 26, 26 'for feeding to and a cutting means 27 for cutting the roll paper 3 at a predetermined timing are provided. Further, a discharge guide plate 28 is obliquely provided so as to cover the upper side of the cutting means 27, and a cover 29 which also serves as a discharge guide is provided so as to be swingable and openable continuously with the discharge guide plate 28. There is. A fixing means 30 for fixing the cover 29 in the closed position is provided on the upper inner side of the cover 29.

The guide member 31 guides the cut sheets 4 and the like discharged through the paper passage to the movable deck 1 side, and the bending guide member 32 is arranged in the lower space of the movable deck 1 and the guide member 31 is provided. The cut sheets 4 and the like are guided to the tray 33. The tray 33 is arranged in a plate shape below the unit frame 22, and is provided with the bending guide member 32.
The cut paper 4 and so on are placed.

Next, the operation of the image forming apparatus having the above structure will be described. That is, the standard paper 4 fed from the paper feed cassette 10 to the paper feed port 5, the manual paper 4 fed manually to the paper feed port 5, or the roll paper feeding unit 6 is fed to the paper feed port 5. The cut paper 4 formed by cutting the roll paper 3 at a predetermined timing is transferred and fixed by the copying machine main body 2 as described above. After that, the cut paper 4 and the like are discharged to the outside of the main body 2 through the paper discharge roller 21,
A guide member 31 is passed through between the paper discharge guide plate 28 and the cover 29, and the guide member 31 moves the movable deck 1
The path of the cut sheet 4 is changed to the side, the tip end of the cut paper 4 or the like comes into contact with the bent portion of the bending guide member 32, and the rear end falls off the guide member 31 and is placed on the upper surfaces of the bending guide member 32 and the tray 33. Placed.

Next, the structure of the first embodiment of the support shaft 24 will be described with reference to FIGS. 1 and 2. Support shaft 2
Reference numeral 4 designates the core tube 34 of the roll paper 3 as a first inner contact 341 and a second inner contact 341.
The inner contact 342 and the third inner contact 343 are supported at three points as viewed in the axial direction, and the support member 35 and the support member 36 having the same shape are opposed to each other, and both ends of the support member 35 and the fixed shaft 37 having a short dimension are fixed. It is formed by fixing the shaft 38 with screws or the like.

That is, as the support member 35, a long plate-like member is bent outward at about 120 °, and the first support piece is located in the upper half of this bent portion in the longitudinal direction in FIG. 351 is formed so as to be inscribed at the first inner contact 341,
On the other hand, a second support piece 352 is formed below the bent portion so as to be inscribed at the second inner contact 342, and the tip end thereof is extended toward the third inner contact 343 side for regulation. Piece 3
53 is formed. Similarly, the support member 36 is formed by bending a long plate-shaped member outward at about 120 °, and the first support piece 36 is provided at the upper half of the bent portion in the longitudinal direction in FIG.
1 is formed so as to be inscribed at the first inner contact 341, while a third support piece 362 is formed at the lower portion of the bent portion so as to be inscribed at the third inner contact 343,
The tip is extended toward the second inner contact 342 side to form a regulation piece 363. The tip of the restriction piece 353 and the tip of the restriction piece 363 are in contact with each other. In addition, the tip ends of the restriction pieces 353 and 363 are bent so as to facilitate contact.

Further, on the upper side of the support member 35, there is formed a restriction piece 354 in which a substantially left half portion in the longitudinal direction of FIG. 1 is bent inward, and this restriction piece 354 is shown in FIG. As shown, the first support piece 361 of the support member 36 is in contact with the inner surface side of the first support piece 361. Similarly, on the upper side of the support member 36, there is formed a restriction piece 364 in which a substantially right half portion in the longitudinal direction of FIG.
4 is in contact with the inner surface side of the first support piece 351 of the support member 35.

The fixed shaft 37 is connected to a bearing, is rotatably supported by the insertion guide 25 (FIG. 10) via this bearing, and the fixed shaft 38 is connected to a brake shoe 39 which also serves as a bearing and a handle ( (See FIG. 5), the insertion guide 25 is rotatably supported.

Next, the structure of the second embodiment of the support shaft according to the present invention will be described with reference to FIGS. Second
In the embodiment, the arm 40 and the swing rod 41 are provided on the support shaft 24 described above.

That is, an arm 40 extending in the axial direction of the fixed shafts 37 and 38 is provided near the central portion in the longitudinal direction of both support members 35 and 36, and the support shaft 4 orthogonal to the axial lines of the fixed shafts 37 and 38.
5 is pivotally attached around 5 and the support shaft 45
The intermediate portion of the swing rod 41 is pivotally connected to the vicinity of the pivotal attachment portion of the arm 40 via a pivot shaft 46 parallel to the. The swing rod 4
1, a locking member 43 formed by connecting a plurality of small projections is formed on both sides in the longitudinal direction, and the locking member 4 is further provided.
Biasing means 42 for supporting the core tube 34 by pressing the core tube 3 against the core tube 34 is provided. The swing rod 41 is pivotally connected to the arm 40 while being slightly biased in the extending direction of the arm 40, and the tip end side (the insertion side into the core tube 34) of the swing rod 41 is lowered due to imbalance in weight. .

The urging means 42 is composed of a pressing means 47 such as a spring and a screw 48. The pressing means 47 is provided between the support member 36 and the arm 40, and presses the locking member 43 against the first inner contact 341 (see FIG. 2) of the core tube 34. The screw 48 regulates the swing range of the arm 40 by being screwed into the regulation piece 364 of the support member 36 through a hole 401 formed in the arm 40. That is, the head 4 of the screw 48
The diameter of 81 is formed to be larger than the diameter of the hole 401, and the swinging of the arm 40 due to the urging force of the pressing means 47 is regulated by contact with the head 481.

Then, the arm 40 and the brake shoe 39
By holding the (fixed shaft 38) so as to be close to each other, the rocking rod 41 is lowered, the locking member 43 is disengaged from the core tube 34, and the support shaft 24 can be easily withdrawn. Further, the insertion into the core tube 34 can be easily performed.

In this way, the core cylinder 34 is provided outside the support member 35 and the support member 36 by the locking member 43 of the swing rod 41.
By supporting the roll paper 3, it is possible to prevent the roll paper 3 from swinging in the cylinder radial direction.

Next, a structure showing a third embodiment of the support shaft according to the present invention will be described with reference to FIGS. The same reference numerals as those in FIGS. 1 to 5 serve the same functions.

In the above-described second embodiment, the core tube 34 is supported outside the support members 35 and 36 by the locking member 43 of the swing rod 41, but the support shaft 241 of the third embodiment is used.
Then, the locking member (first support piece) of the swing rod 41 described above.
The core tube 34 is pressed and biased by only 43 to support it.

That is, instead of the first support piece 351 and the first support piece 361, the support member 350 and the support member 360 are provided with the arm pivot attachment members 44 of the same shape. As shown in FIG. 7, the arm pivot attachment member 44 is formed to be shorter than the first support piece 351 and the first support piece 361 described above, and the core tube 34 is formed.
It is designed not to be inscribed on. The arm 40 is a support shaft 45.
The arm pivoting member 44 on the side of the supporting member 360 is connected and supported via. An attachment hole 441 for attaching the support shaft 45 is also formed in the arm pivot member 44 of the support member 350 so that the arm 40 can be connected and supported.

Then, after holding the arm 40 and the brake shoe 39 so that they are close to each other and inserting the support shaft 241 into the core tube 34, when the grip is released, the arm 40 is urged by the urging force of the urging means 42. It is swung around the support shaft 45 toward the biasing means 42, and the biasing force by the biasing means 42 is applied to the pivot shaft 46 via the arm 40, so that the pivot shaft 46 can be swung freely. Each locking member 43 of the rocking rod 41 is pressed and urged against the first inner contact 341 of the core cylinder 34. Further, along with the pressing force, the second supporting piece 352 and the third supporting piece 362 are pressed to the second inner contact 342 and the third inner contact 343, respectively, over the entire length in the longitudinal direction.

That is, the core tube 34 includes the locking member 43 of the rocking rod 41, the second supporting piece 352, and the third supporting piece 3.
It is supported by 62 at three points in the axial direction.

In the second and third embodiments, the locking members 43 of the rocking rod 41 are partially formed on both sides of the rocking rod 41 in the longitudinal direction. The member 43 may be provided in the central portion of the swing rod 41, or may be provided over the entire length of the swing rod 41 in the longitudinal direction. Further, the pressing means 47 of the urging means 42 is connected to the support member 36 and the arm 40.
Although it is provided between them, it may be provided between the support member 35 and the arm 40.

The second support piece 352 and the third support piece 362 are formed, for example, in a sawtooth shape so as to be inscribed in the second inner contact 342 and the third inner contact 343, or
Alternatively, the second support piece 352 and the third support piece 362
May be inscribed in the core tube 34 intermittently in the longitudinal direction.

Further, instead of the fixed shaft 37 and the fixed shaft 38, the fixed shaft may be formed of a long single shaft, and the support member 35 and the support member 36 may be fixed to the fixed shaft with screws or the like. Good.

[0042]

According to the present invention, the first support member and the second support member having the same shape are opposed to each other, and the first support member having the short dimension
Since it is fixed to the fixed shaft and the second fixed shaft and the core cylinder of the roll paper is supported at three points as viewed in the axial direction, the number of parts can be reduced and the weight of the fixed shaft can be reduced. Therefore, the manufacturing cost can be reduced and the weight can be reduced, and the assemblability can be improved.

In the second aspect, the restriction pieces of the first support member and the second support member restrict the bending of the first support piece of each of the first support member and the second support member. Therefore, the rigidity of the first support piece can be improved.

Further, in the present invention, the first support piece is pressed and urged against the first inner contact, and the sway of both sides of the roll paper in the radial direction of the core cylinder is prevented. Therefore, it is possible to prevent a sheet feeding failure such as skewed sheet feeding, and it is possible to suitably feed the roll paper.

According to a fifth aspect of the invention, the extending end of the second support piece of the first support member restricts the bending of the third support piece of the second support member, and the second support member of the second support member is bent. Since the extending end of the third support piece regulates the bending of the second support piece of the first support member, the rigidity of the third support piece and the second support piece is improved, and the vibration of the roll paper is caused. Jam and the like can be prevented, and the roll paper can be stably fed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a roll paper support shaft structure according to the present invention.

FIG. 2 is an end view of the first embodiment of the present support shaft structure.

FIG. 3 is a side view showing a second embodiment of the present support shaft structure.

FIG. 4 is a plan view of a second embodiment of the present support shaft structure.

FIG. 5 is a perspective view of a second embodiment of the support shaft structure.

FIG. 6 is an exploded perspective view of a third embodiment of the support shaft structure.

FIG. 7 is a schematic vertical sectional side view of a third embodiment of the present support shaft structure.

FIG. 8 is a perspective view of a third embodiment of the present support shaft structure.

FIG. 9 is a schematic vertical sectional side view of an image forming apparatus to which the present support shaft structure is applied.

FIG. 10 is a vertical cross-sectional side view of the roll paper feeding unit showing an opened state of the cover.

FIG. 11 is an exploded perspective view of a conventional support shaft.

FIG. 12 is an end view of a conventional support shaft.

[Explanation of symbols]

 3 Roll Paper 24 Support Shaft 34 Core Tube 35, 36 Support Member 37, 38 Fixed Shaft 41 Swing Rod 42 Biasing Means 43 Locking Member (First Support Piece) 341 First Inner Contact Point 342 Second Inner Contact Point 343 Third inner contact 351,361 First support piece 352 Second support piece 362 Third support piece 353,354,363,364 Control piece

Claims (5)

(57) [Claims] 1. A roll paper support shaft structure inscribed in a roll paper core cylinder at three points as viewed in the axial direction, wherein a first inner contact and a second inner contact support the core cylinder. A first supporting member having first and second supporting pieces; and a first and a first supporting member having the same shape as the first supporting member and supporting the core cylinder with a first inner contact and a third inner contact. A second support member having three support pieces, and the first and second support members provided with short dimensions at both ends in the longitudinal direction, respectively.
And a fixed shaft for fixing the supporting member of the above in a facing manner. 2. The roll paper support shaft structure according to claim 1, wherein the first support member has a restriction piece that abuts the first support piece of the second support member in a fixed state, The roll paper support shaft structure, wherein the second support member has a restriction piece that abuts the first support piece of the first support member in a fixed state. 3. In a roll paper support shaft structure inscribed in a roll paper core cylinder at three points in the axial direction, the roll paper support shaft structure can be connected and supported by one of the following first or second support members. A first support piece for supporting the core tube with inner contacts of the
A first support member having a second support piece for supporting the core tube with inner contacts of the first support member, and a third support member having the same shape as the first support member.
Second support member having a third support piece for supporting the core cylinder with inner contacts of the first and second support members, and the first and second support members are provided with short dimensions at both longitudinal ends thereof, respectively. 2. A support shaft structure for roll paper, comprising: a fixed shaft that fixes the two support members so as to face each other. 4. The roll paper support shaft structure according to claim 3, further comprising an urging means for pressing and urging the first support piece against the first inner contact. Shaft structure. 5. The roll paper support shaft structure according to claim 1, 2, 3 or 4, wherein the second support piece of the first support member is bent from the second inner contact to form the third support member. Of the second support member, the third support piece of the second support member is bent from the third inner contact to extend to the second inner contact side, and these extended ends are A support shaft structure for roll paper, characterized in that they are in contact with each other.