JPH0825673B2 - 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,
As shown in FIGS. 11 and 12, it is known to inscribe the inner peripheral surface S of the core cylinder 96 of the roll paper at three points in the axial direction to support the roll paper.

In this device, a support member 91 having first and second support pieces d and e and two flat plate members 92 and 92 are fixed to a core shaft 93, and the flat plate members 92 and 92 are arranged in the longitudinal direction. At the intermediate portion, a core shaft 93 is provided via a support shaft 94 orthogonal to the axis of the core shaft 93.
An axially extending arm 95 is pivotally attached, and a sawtooth-shaped third support piece f is continuously provided in the vicinity of the pivotal attachment portion of the arm 95, and the third support piece f is attached to the inner circumference of the core tube 96. A biasing means 97 for biasing the surface S is provided. 98 in the figure is a balancer.

According to the above construction, the roll paper support shaft 99 with respect to the core shaft 93 is gripped by holding the arm 95 close to the core shaft 93 against the biasing force of the biasing means 97.
Can be easily inserted and removed.

[0006]

However, since the third support piece f is limited to the vicinity of the pivotal portion, the third support piece f is not provided.
Both sides in the longitudinal direction of the core tube 96 easily swing in the tube radial direction with the support piece f as a fulcrum, which makes unstable feeding of roll paper and causes feeding failure such as oblique feeding. There was an easy drawback.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a roll paper support shaft structure in which the deflection of the core cylinder is effectively prevented by a very rational improvement. There is.

[0008]

In order to achieve the above object, the present invention provides first to third support pieces which are inscribed in the inner peripheral surface of the core cylinder of roll paper at three points in the axial direction of the core cylinder. In a support shaft structure for roll paper configured to support roll paper by means of a first support member provided with a first support piece that contacts the inner peripheral surface of the core cylinder in the longitudinal direction, and the inner peripheral surface of the core cylinder. The second support members having the second support pieces that are in contact with each other in the longitudinal direction are opposed to each other and fixed to the core shaft, and an arm extending in the axial direction of the core shaft is provided at an intermediate portion in the longitudinal direction of the both support members. A third pivot member pivotally mounted about a support shaft orthogonal to the axis of the core shaft and provided with third support pieces at least on both sides in the longitudinal direction.
An intermediate portion of the support member is pivotally attached to the arm via a pivot shaft parallel to the support shaft, and a biasing means for pressing and biasing the third support piece against the inner peripheral surface of the core cylinder is provided. The point is characteristic.

[0009]

According to the above characteristic structure, in addition to the core cylinder support by the support pieces of the first and second support members, which are in contact with the inner peripheral surface of the core cylinder in the longitudinal direction, at least the length by the third support member is increased. By achieving the core tube support by the support pieces at the two places separated from each other in the direction, the runout of both sides of the roll paper in the radial direction of the core tube is effectively prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is a block diagram showing an example of a copying machine (image forming apparatus) to which the roll paper support shaft structure according to the present invention is applied.
7 and 8 are side views showing how the roll paper is attached to the roll paper feeding unit body.

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

Further, the copying machine main body 2 has its device case 7
An exposure unit 8 and a document conveying unit 9 are provided on the upper side of the sheet feeding device, and a sheet feeding cassette 10 for storing large-sized fixed sheets is provided on the lower side of the sheet feeding unit 6 so as to be freely drawn out to the roll sheet feeding unit 6 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, a cleaning device 16 and the like are arranged along the rotation direction of the photoconductor drum 11. I have it.

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 photosensitive drum 11 is uniformly charged by the charging device 12, and an electrostatic latent image is formed by the above exposure.

This electrostatic latent image is developed with toner by the developing device 13, and then transferred by the transfer device 14 to the cut paper 4 or the fixed paper 4 or the like from the paper feed cassette 10 (hereinafter referred to as cut paper 4). , The photoconductor drum by the separating device 15
Separated from 11.

Further, the paper feed cassette is provided upstream in the feeding direction.
A paper feed guide 17 is provided from the paper feed unit 10 to the paper feed port 5, and a paper feed conveyance path 18 is provided from the paper feed port 5 to the transfer device 14.
Is provided, so that the cut paper 4 becomes a photosensitive drum.
Paper is fed to 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 sheet 4 after the transfer.

The roll paper feeding unit 6 includes a connecting member 22.
It is composed of a unit frame 23 mounted on the side of the paper feed port 5 of the copying machine main body 2 via a paper feed unit main body 31 which can be raised and lowered with respect to the unit frame 23. The unit frame 23 in this is as follows. Is configured.

That is, vertical frames 26 are erected on both right and left sides of the bottom frame 25, guide rails 27 are provided on both front and rear sides of the vertical frame 26, and tie rods 28 are attached to the upper ends of the left and right vertical frames 26. At the same time, caster wheels 29 are provided at the lower four corners of the bottom frame 25 so as to be vertically slidable, so that the horizontal level can be adjusted and moved.

The paper feed unit main body 31 is provided with rollers 30 loosely fitted on the guide rails 27 in the vicinity of the upper and lower four corners of the elevating frame 32, and urging means for lifting and urging the elevating frame 32. (Eg gas spring) 33
Are provided on the left and right sides across the bottom frame 25 and the elevating frame 32, and, as shown in FIGS. 7 and 8,
An insertion guide 36 for the support shaft 24 for supporting the roll paper 3 is formed on the left and right side plate portions 34 of the elevating frame 32 to form a loading portion 37 for the roll paper 3.

The upper and lower four rollers on the main body 2 side of the copying machine.
The axis of 30 is directed to the left and right of the unit,
It is considered that the roll paper feeding unit 6 is prevented from swinging in the front-back direction with respect to the copying machine body 2. The axis of the four upper and lower rollers 30 on the opposite side of the copying machine body 2 is oriented in the front-back direction of the unit to prevent the roll paper feeding unit 6 from swinging in the left-right direction with respect to the copying machine body 2. Are considered to be.

A pair of paper feed rollers 38 and 39 are provided in the middle of a paper passage extending from the paper feed section above the roll paper loading section 37 to the paper ejection section a of the copying machine main body 2. A roll paper leading end holding member 55 that holds the leading end of the roll paper 3 by the paper roller means 40 and the paper feed guide plate 41, and a cutting means 43 for cutting the roll paper 3 to a predetermined length at a predetermined timing.
Is provided.

Further, a discharge guide plate 44 is obliquely provided so as to cover the upper side of the roll paper cutting means 43, and the side plate portion 34 of the elevating frame 32 is made to correspond to the roll paper loading portion 37. A cover 45, which also serves as a paper ejection guide, is provided so as to swing around a lower support shaft 46 so as to be openable and closable, and the main body of the copying machine is inward of the cover 45 and sandwiches the paper passage. The paper feed roller 38 of the paper feed roller means 40 is attached to the side opposite to 2 in a freely rotatable manner.

A lock means 47 for locking the cover 45 at the closed position and a lock release means 48 for releasing the lock by the lock means 47 are provided.
The locking means 47 is the side plate portion 34 of the elevating frame 32.
An engaging pin 59 is provided on the side plate 34, and a hook member 58 that can be engaged with and disengaged from the engaging pin 59 is pivotally attached to the side plate portion 34.

In FIG. 6, reference numeral 49 in the figure is a guide plate which constitutes a sheet discharge path by the cover 45, and 50 is the moving deck 1.
The bending guide member disposed in the lower space of the unit tray 23 is a plate-shaped tray 51 connected to the lower side of the guide member 50.
It is provided at the bottom of.

The cover 45 has a roll paper loading unit 37.
A window (not shown) for confirming the remaining amount of the roll paper 3 loaded in is formed. Further, the guide plate 49 is entirely formed of a transparent or translucent resin material so that the remaining amount of the roll paper 3 through the window and the passage of the cut paper in the paper discharge path can be confirmed.

According to the above construction, the cut paper 4 fed from the paper feed cassette 10, the manual cut paper 4 fed through the paper feed port 5, or the roll paper feed unit 6
The so-called cut paper 4 obtained by cutting the roll paper 3 fed out from the paper and fed to the paper feed port 5 at a predetermined timing is discharged to the outside of the apparatus through a pair of paper discharge rollers 21 after image formation.

The cut paper 4 is guided by the paper discharge guide plate 44 and the cover 45, reaches the bending guide member 50 through the space between the cover 45 and the guide plate 49, and the tip of the cut paper 4 is bent and guided. The cut paper 4 is in contact with the bent portion of the member 49 and
When the rear end falls off the guide member 50, the bent guide member 50 and the tray 51 are taken out.

A roll paper support shaft 24 will be described with reference to FIGS.
The specific structure of will be described. This roll paper support shaft 24
Is a first support member 72 having a first support piece d that contacts the inner peripheral surface S of the core cylinder 71 of the roll paper 3 in the longitudinal direction, and a second support member 72 that contacts the inner peripheral surface S of the core cylinder 71 in the longitudinal direction. Second with support piece e
The support members 73 are opposed to each other, and both ends thereof are fixed to the short-sized core shafts 74 and 75 with screws or the like.

Then, the end portions of the core shafts 74 and 75 are projected from the end portions of both the supporting members 72 and 73 so as to be rotatably supported with respect to the insertion guide 36, and the one core shaft 75 There is a brake shoe 76 that doubles as a handle.

Further, an arm 77 extending in the axial direction of the core shafts 74, 75 is swingable around a support shaft 78 orthogonal to the axis lines of the core shafts 74, 75 at an intermediate portion in the longitudinal direction of the both support members 72, 73. A third support member 80, which is freely pivoted and has sawtooth-shaped third support pieces f on both sides in the longitudinal direction in the vicinity of the pivot portion of the arm 77 via a pivot shaft 79 parallel to the pivot shaft 78. Of the second support member 73 and the arm 77. The second support member 73 and the arm 77 are provided with a biasing means 81 that pivotally connects the intermediate portion of the second support member f and biases the third support piece f to the inner peripheral surface S of the core cylinder 71.
It is provided between and.

Reference numeral 82a in the figure denotes a hole h formed in the arm 77.
A screw screwed to a second restriction piece (details will be described later) 87 of the second support member 73 through
The diameter of the screw head 82 is smaller than the diameter of 82, and the swinging of the arm 77 by the urging force of the urging means 81 is regulated by the contact of the arm 77 with the screw head portion 82, so that the screw head 82 is A swinging restricting member 82 that restricts the swinging range of the arm 77 is configured.

The first and second support members 72 and 73 have the same shape, and the first and second support members 72 and 73 have the same shape.
The support piece d is bent at the first contact portion i with respect to the inner peripheral surface S of the core cylinder, and the first extending portion 83 of the second support piece e toward the second contact portion j with respect to the inner peripheral surface S of the core cylinder 83. And the second supporting piece e of the second supporting member 73 is bent at the second contact portion j with respect to the inner peripheral surface S of the core cylinder to form the inner peripheral surface S of the core cylinder of the first supporting piece d.
A second extension portion 84 toward the first contact portion i with respect to the first and second extension portions 83 and 84, and the extended ends of the first and second extension portions 83 and 84 are bent toward the core shafts 74 and 75 to extend the extension. The bent ends are brought into contact with each other.

Then, the first and second support members 72, 73
In addition, the arm pivoting member 85 is bent and connected at a predetermined angle, for example, at a bending angle of 120 degrees, and the core shafts 74, 75
The first restricting piece 86 extending toward the arm pivoting member 85 side of the second supporting member 73 in a fixed state by bending is provided continuously, and the other end side in the longitudinal direction of the arm pivoting member 85 on the second supporting member 73 side. Half of
A second regulating piece 87 extending toward the arm pivot member 85 side of the first supporting member 72 in a fixed state by the core shafts 74 and 75 is bent and continuously provided,
The core shafts 74, 75 are brought into contact with the first and second restricting pieces 86, 87.

The pivotal connection position of the third support member 80 by the pivot shaft 79 is slightly offset in the extending direction of the arm 77, and the tip end of the third support member 80 is unbalanced due to weight imbalance. The side (insertion side into the core tube 71) is configured to be lowered and to be selfish.

According to the above construction, since the core shafts 74 and 75 for fixing the first and second support members 72 and 73 have short dimensions, it is possible to achieve weighting, and both the support members 72 and 73 described above. Have the same shape, the number of parts is substantially reduced, and the cost is reduced.

Further, extending portions 83, 84 and arm pivoting members 85, 85 are bent and connected to the first and second supporting members 72, 73, respectively, and the extending portions 83, 84 are mutually connected. Since they are in contact with each other, the rigidity of the first and second support members 72, 73 is improved,
Jam or the like due to vibration of the roll paper 3 can be prevented, and the roll paper 3 can be stably fed.

Further, since the restricting pieces 86, 87 are bent and connected to the supporting members 72, 73 and the core shafts 74, 75 are brought into contact with the restricting pieces 86, 87, the supporting members 72, 73 and the core are not contacted. The fixation to the shafts 74 and 75 becomes easy.

On the other hand, a roll paper support shaft for the core cylinder 71
At the time of inserting / removing 24, by holding the arm 77 and one of the core shafts 75 so as to be close to each other against the urging force of the urging means 81, the pivot shaft 79 of the third support member 80 is cored. The support pieces f, f of the third support member 80 are pulled away from the inner peripheral surface S of the core cylinder 71 by being pulled toward the shaft 75 side.

Because of this fact and the tip side of the third supporting member 80 is lowered, the core cylinder 71 of the roll paper 3 is formed.
The support shaft 24 can be easily inserted into or removed from the.

Then, when the grip of the arm 77 is released after the support shaft 24 is inserted into the core cylinder 71, the arm 77 is oscillated by the urging force of the urging means 81 around the support shaft 78. The third support member 80 swingable around the pivot shaft 79 by being swung toward the 82 side and applying the biasing force of the biasing means 81 to the pivot shaft 79 via the arm 77.
Both the supporting pieces f, f are pressed and urged against the inner peripheral surface S of the core cylinder 71, and the supporting pieces d, e of the first and second supporting members 72, 73 are moved by the pressing urging. The inner circumferential surface S of the core cylinder 71 is pressed and biased over the entire length in the longitudinal direction.

Thus, the core cylinder support by the support pieces d and e of the first and second support members 72 and 73, which are in contact with the inner peripheral surface S of the core cylinder 71 in the longitudinal direction, and the third support member. Since the core cylinders are held by the support pieces provided at two positions separated from each other on the 80, the roll paper 3 is surely prevented from swinging in the radial direction, and the roll paper is not accompanied by oblique paper feed. 3 is stably fed and fed.

The third support pieces f, f are replaced with a third support member.
Although it is partially formed on both sides in the longitudinal direction of 80, the third supporting piece is also provided in the central portion of the third supporting member 80 in the longitudinal direction, or the third supporting pieces f, f are formed on the third supporting member 80. It is possible to make changes such as providing over the entire length in the longitudinal direction.

Further, the supporting pieces d and e of the first and second supporting members 72 and 73 may also be formed in a sawtooth shape or a core tube.
It is possible to make modifications such that the inner peripheral surface S of 71 is intermittently inscribed in the longitudinal direction.

In the above embodiment, the roll paper support shaft 24
The first and second support members 72, 73 of No. 1 are fixed to the short-sized core shafts 74, 75, but as shown in FIG. The present invention can also be achieved by fixing the first and second support members 72, 73 to the shaft 74.

As shown in FIG. 10, the roll paper support shaft 24 has a first support member 72 having a first support piece d which is in contact with the inner peripheral surface S of the core cylinder 71 of the roll paper 3 in the longitudinal direction. And a second support piece e having the same shape as the first support member 72 and contacting the inner peripheral surface S of the core cylinder 71 in the longitudinal direction.
The support members 73 are opposed to each other and fixed to one core shaft 74 with screws or the like, and the end portion of the core shaft 74 is supported by both support members 7.
A brake shoe 76, which also projects from the end portions of the reference numerals 2 and 73, and which also serves as a handle, is provided on one end side in the longitudinal direction of the core shaft 74.

An arm 77 extending in the axial direction of the core shaft 74 is pivotally attached to an intermediate portion in the longitudinal direction of the support members 72, 73 so as to be swingable around a support shaft 78 orthogonal to the axis of the core shaft 74. In addition, an intermediate portion of the third support member 80 provided with the third support pieces f having a sawtooth shape on both sides in the longitudinal direction is provided in the vicinity of the pivotal attachment portion of the arm 77 via the pivotal support shaft 79 parallel to the support shaft 78. A biasing means 81 that is pivotally connected and that biases the third support piece f against the inner peripheral surface S of the core cylinder 71 is provided between the second support member 73 and the arm 77.

A screw 82a is screwed into the core shaft 74 through a hole h formed in the arm 77, and the diameter of the hole h is smaller than the diameter of the screw head 82. The screw head 82 serves as a swing restricting member 82 that restricts the swing range of the arm 77.

On the other hand, in the first supporting member 72, the first supporting piece d of the first supporting member 72 is bent at the first contact portion i with respect to the inner peripheral surface S of the core tube, and the inner peripheral surface of the core tube of the second supporting piece e is bent. A first extending portion 83 extending toward the second contact portion j with respect to the surface S is formed, and in the second supporting member 73, the second supporting piece e of the first extending portion 83 is formed on the inner peripheral surface S of the core cylinder.
A second extended portion that is bent at the second contact portion j with respect to and extends toward the first contact portion i side with respect to the core cylinder inner peripheral surface S of the first support piece d.
84 is formed.

Further, the first and second support members 72, 73
The arm pivot member 85 is bent and connected at a predetermined angle, for example, a bending angle of 120 degrees, and as shown by an imaginary line c,
About half of the longitudinal direction of the arm pivot member 85 is cut away.

That is, in the roll paper support shaft 24 shown in FIG. 1, the extending ends of the first and second extending portions 83, 84 of the first and second supporting members 72, 73 are bent and The extended bent ends are brought into contact with each other, and the first and second support members 72,
Although the first and second restricting pieces 86 and 87 are provided on the 73, respectively, in the roll paper support shaft 24 shown in FIG. 9, the extending amounts of the first and second extending portions 83 and 84 are small. In addition, the first and second restriction pieces 86, 87 are omitted.

[0051]

As described above, according to the present invention, the first and second portions, which are in contact with the inner peripheral surface of the core cylinder in the longitudinal direction, are provided.
In addition to the core tube support by the support member, core tube support is achieved at at least two distant positions on both sides in the longitudinal direction of the third support member, so that the runout of both sides of the roll paper in the radial direction of the core tube is prevented. Thus, the roll paper can be appropriately fed in a predetermined manner without causing a paper feed failure such as oblique paper feed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a roll paper support shaft.

FIG. 2 is an end view of a roll paper support shaft.

FIG. 3 is a side view of a roll paper support shaft.

FIG. 4 is a plan view of a roll paper support shaft.

FIG. 5 is a perspective view of a roll paper support shaft.

FIG. 6 is a schematic side view of the image forming apparatus.

FIG. 7 is a vertical cross-sectional side view of a paper feeding unit main body.

FIG. 8 is a vertical cross-sectional side view of the sheet feeding unit body showing an opened state of the cover.

FIG. 9 is an exploded perspective view showing another embodiment of the roll paper support shaft.

FIG. 10 is an end view of a roll paper support shaft of another embodiment shown in FIG.

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

12 is an end view of the roll paper support shaft shown in FIG.

[Explanation of symbols]

3 ... Roll paper, 71 ... Core tube, 72 ... First support member, 73 ... Second
Support member, 74, 75 ... Core shaft, 77 ... Arm, 78 ... Support shaft, 79 ...
Pivot shaft, 80 ... Third support member, 81 ... Energizing means, d ... First support piece, e ... First support piece, f ... Third support piece, S ... Inner peripheral surface.

Claims (1)

[Claims] 1. A roll paper support shaft configured to support the roll paper by first to third support pieces inscribed in the core cylinder inner peripheral surface of the roll paper at three points in the axial direction of the core cylinder. In the structure, a first supporting member including a first supporting piece that contacts the inner peripheral surface of the core cylinder in the longitudinal direction, and a second supporting member including a second supporting piece that contacts the inner peripheral surface of the core cylinder in the longitudinal direction. Are opposed to each other and fixed to the core shaft, and an arm extending in the axial direction of the core shaft is pivotally mounted at a middle portion in the longitudinal direction of the both support members so as to be swingable around a support shaft orthogonal to the axis of the core shaft. And a third support piece at least on both sides in the longitudinal direction.
An intermediate portion of the support member is pivotally attached to the arm via a pivot shaft parallel to the support shaft, and biasing means for biasing the third support piece against the inner peripheral surface of the core cylinder is provided. A support shaft structure for roll paper, which is characterized in that