JPH08208079A - Cut paper sheet delivering device - Google Patents

Abstract

PURPOSE: To provide a cut paper sheet delivering device having a low-cost pressure roller capable of bending a cut paper sheet along the curved surface of a paper sheet delive passage, and restraining the occurrence of a sheet jam in the curved paper sheet transfer passage. CONSTITUTION: A pressure roller 22 is formed out of a main roller section, boss sections 22c respectively projected from both ends thereof and auxiliary pressurizing sections 22d coupled to the sections 22c and fastened to both ends of the main roller section. The main roller section is integrated with the boss sections 22c by use of resin or the like, and formed to be columnar type having the prescribed radius. Furthermore, the boss sections 22c formed to be approximately cylindrical is provided on the edges of the sections 22d, so as to have the centers thereof aligned with the rotation shaft of the roller 22. Also, the sections 22c have spline type projections 22 on the external surface thereof along an axial direction. On the other hand, the sections 22d formed like a ring is formed out of an expanded sponge or the like having sufficient elasticity and irregularities on the surface thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cut sheet conveying device which is applied to a copying machine, a printer, a facsimile and the like and conveys cut sheets such as originals and recording sheets fed one by one.

[0002]

2. Description of the Related Art FIG. 9 is a side sectional view showing an essential part of a conventional cut sheet conveying apparatus, and FIG. 10 is a perspective view of a pressure roller and a guide plate in the cut sheet conveying apparatus shown in FIG.
Reference numerals 1 and 2 denote guide plates in which respective guide surfaces 1a and 2a are opposed to each other. The guide plates 1 and 2 form a substantially U-shaped paper conveyance path 3 between the guide surfaces 1a and 2a. There is. A feed roller 4 has a roller surface 4a protruding from the guide surface 1a into the paper conveyance path 3 and is rotated in a direction of an arrow A by a drive mechanism (not shown). 3 is a separating roller in which the roller surface 5a is brought into pressure contact with the roller surface 4a of the feed roller 4. Reference numeral 6 denotes a roller that projects a roller surface 6a from the guide surface 2a into the paper transport path 3 and rotates in the direction of arrow A by a drive mechanism (not shown). It is a pressure roller in which the surface 7a is projected and the roller surface 7a is brought into pressure contact with the roller surface 6a of the transport roller 6. A pair of rollers including a conveyance roller 6 and a pressure roller 7 is arranged at a constant distance corresponding to a cut sheet size that the apparatus can convey in the sheet conveyance path 3.

Generally, the surface layer portion of the conveying roller 6 is made of a material having elasticity such as rubber and having a sufficiently large coefficient of friction with respect to the cut sheet, and the pressure roller 7 is
From the viewpoint of manufacturing cost, a resin or the like integrally molded by molding is often used. Further, in the U-shaped paper conveyance path 3 for reversing the cut paper, the cut paper is curved at the time of conveyance and an unreasonable force is applied to the cut paper, which increases the probability that the cut paper will be jammed. Therefore, the outer guide plate 1 is configured to be openable in a direction away from the inner guide plate 2 so that the jammed cut sheet can be easily taken out. When the outer guide plate 1 is openable in this way, the layout is easy, so that the transport roller 6 to which the rotational force from the drive mechanism is transmitted protrudes from the inner guide plate 2. Placed,
The pressure roller 7, which is a driven roller, is arranged so as to project from the outer guide plate 1.

Next, the operation of conveying the cut sheet in the above-described sheet conveying apparatus will be described. A pickup mechanism (not shown), for example, separates a certain number or less of cut sheets from a bundle of cut sheets placed on a document table and inserts the cut sheets into a pressure contact portion between the feed roller 4 and the separation roller 5. The feed roller 4 rotates in the direction of arrow A when a plurality of cut sheets are fed. As a result, the cut sheet inserted in the pressure contact portion between the feed roller 4 and the separation roller 5 is conveyed in the conveying direction (arrow B) generated by the feed roller 4.
Direction) and the frictional force of the separation roller 5 to separate the sheets one by one and convey them along the paper conveyance path 3. The cut sheet conveyed by the feed roller 4 is wound around the pressure contact portion between the conveying roller 6 rotating in the direction of arrow A and the pressure roller 7, and is conveyed by the conveying roller 6 and the pressure roller 7 along the sheet conveying path 3. To be done. The cut sheet conveyed by the first conveying roller 6 and the pressure roller 7 is continuously conveyed in the direction of the arrow B until it is discharged to a predetermined discharging position by the conveying roller 6 and the pressure roller 7 on the downstream side. It

[0005]

11 and 12 are cross-sectional views for explaining a paper jam in a paper transport path of a conventional cut paper transport device. The cut paper P fed from the feed roller 4 contacts the roller surface 7a of the pressure roller 7 protruding from the outer guide plate 1 when the paper transport path 3 is curved. At this time, the pressure roller 7 bends the cut paper P along the curved surface of the paper transport path 3 by the frictional force between the roller surface 7a and the front end of the cut paper P, so that the leading end of the cut paper P is transported by the transport roller. It is caught in the pressure contact part with 6. However, when the rigidity of the cut sheet P in the bending direction is high, the cut sheet P does not bend due to the frictional force with the roller surface 7a as shown in FIG. It may be bent in a bellows shape, or may be inserted into the gap between the pressure roller 7 and the guide plate 1 and may be jammed in the paper transport path 3. Even when the cut sheet P is normally conveyed by the first conveying roller 6 and the pressure roller 7, the cut sheet P is moved to the next state as shown in FIG. 12 because the curvature of the sheet conveying path 3 is further increased. Due to the frictional force between the pressure roller 7 and the roller surface 7a, the pressure roller 7 may be jammed in the paper conveyance path 3 without being curved along the paper conveyance path 3.
Such paper jam can be suppressed by forming the surface layer portion of the pressure roller 7 with a material having a large friction coefficient such as rubber, but the surface layer portion of the pressure roller 7 is formed with a material having a large friction coefficient. In that case, the pressure roller 7 cannot be integrally molded, and the assembling process becomes complicated, so that the cost of the pressure roller 7 increases.

In order to solve the above-mentioned problems, an object of the present invention is to provide a low-cost pressure roller capable of surely curving a cut sheet along a curved surface of a paper conveyance path, and to provide a curved paper conveyance path. It is an object of the present invention to provide a cut sheet conveyance device that suppresses paper jams.

[0007]

In order to solve the above-mentioned problems, a first means of the present invention is to provide a paper conveyance path formed between a pair of opposed conveyance guide surfaces and one of the conveyance guides. A conveyance roller that projects a roller surface from the surface and rotates in the conveyance direction, and a roller surface that protrudes from the other conveyance guide surface, and cut paper fed to the pressure contact portion with the conveyance roller is conveyed together with the conveyance roller. In a cut sheet conveying device provided with a pressure roller that conveys along a path, both widthwise end portions of the pressure roller are formed by elastic auxiliary pressure portions, and the outer diameter of the auxiliary pressure portion Is larger than the outer diameter of the main roller portion inside the auxiliary pressure portion.

Further, the second means is to form the auxiliary pressurizing portion in a ring shape, and to insert the auxiliary pressurizing portion into a boss portion protruding from both side ends of the main roller portion and having an outer diameter larger than the inner diameter of the auxiliary pressing portion. It is characterized by that.

Further, the third means is characterized in that a convex portion extending in the axial direction is formed on the outer peripheral surface of the boss portion.

[0010]

According to the above-mentioned first means, both end portions in the width direction of the pressure roller are formed by elastic auxiliary pressure portions, and the outer diameter of this auxiliary pressure portion is smaller than that of the main roller portion. By making it larger, when the cut paper is fed to the curved paper conveyance path and the cut paper comes into contact with the pressure roller protruding from the outer guide surface, the auxiliary pressurizing unit is contacted with the cut paper. The tip end portion of the cut sheet is elastically deformed into a concave shape and bites into the deformed portion where the cut sheet is deformed into a concave shape, and the cut sheet can be reliably curved along the curved surface of the paper conveyance path by the pressure roller.

Further, according to the second means, the auxiliary pressurizing portion is formed in a ring shape, and the auxiliary pressurizing portion is fitted into the boss portion projecting from both side ends of the main roller portion and having an outer diameter larger than the inner diameter of the auxiliary pressing portion. As a result, the auxiliary pressing portion is fixed to the main roller portion by the frictional force with the boss portion.

Further, according to the third means, since the convex portion extending in the axial direction is formed on the outer peripheral surface of the boss portion, the convex portion bites into the inner peripheral surface of the auxiliary pressurizing portion and the boss portion The fixing force in the rotation direction of the inserted auxiliary pressurizing unit increases.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an original reading device to which an embodiment of the cut sheet conveying device of the present invention is applied, and FIG. 2 is a cut sheet conveying device of the present embodiment opened in the original reading device shown in FIG. FIG. 3 is a side sectional view showing a state, and FIG. 3 is a side sectional view showing an essential part of the cut sheet conveying apparatus of the present embodiment. Members corresponding to the members described with reference to FIGS. And the description is omitted.

Reference numeral 11 denotes a document table on which a stack (not shown) of cut sheets P is placed, 12 is a sheet discharge table on which the cut sheets P discharged from the cut sheet conveying device are placed, and 13 is a guide plate 1. Is a contact glass arranged in the lower part of the contact glass 13 and a scanner (not shown) for reading the image of the cut sheet P which is the original is arranged below the contact glass 13. Further, 21 is near the entrance of the paper conveyance path 3. , A pressure roller 22 having a roller surface 22a protruding from the guide surface 1a, and the pressure roller 22 is a main roller portion 22.
b (FIG. 4), a boss portion 22c projecting from both end surfaces of the main roller portion, and an auxiliary pressing portion 22d fitted into the boss portion 22c and fixed to both end portions of the main roller portion, The roller surface 22a is pressed against the roller surface 6a of the transport roller 6. 24 is a guide plate 1 and a pickup roller 2
1, an upper cover that supports the feed roller 4 and the pressure roller 22 and is swingable, and by swinging the upper cover 24 upward as shown in FIG. 2, the outer guide plate 1 Can be separated from the inner guide plate 2 to open the paper transport path 3.

FIG. 4 is a perspective view showing the pressure roller and the guide plate in the cut sheet conveying device of this embodiment, and FIG. 5 is a perspective view showing the pressure roller in pressure contact with the convey roller in the cut sheet conveying device of this embodiment. FIG. 6 is an exploded perspective view of the pressure roller in the cut sheet conveying device of this embodiment. The pressure roller 22 includes a main roller portion 22b, a boss portion 22c protruding from both end surfaces of the main roller portion 22b, and an auxiliary pressurizing member fixed to both end portions of the main roller portion 22b by being inserted into the boss portions 22c. Part 2
It is composed by 2d. The main roller portion 22b is the boss portion 2
It is integrally molded with resin and the like with 2c, and is formed into a cylindrical shape with a constant radius. Further, the boss portion 22c formed in a substantially cylindrical shape is arranged on the end surface of the boss portion 22c so that the center of the boss portion 22c coincides with the rotation axis of the pressure roller 22, and the spline-shaped convex portion 22e is formed on the outer peripheral surface in the axial direction. Has been formed. On the other hand, the ring-shaped auxiliary pressing portion 22d is desirably formed of a material having sufficient elasticity and fine irregularities on the surface, and is formed using, for example, foam sponge.

The auxiliary pressing portion 22d has an inner diameter smaller than the outer diameter of the outer peripheral surface of the boss portion 22c and an outer diameter of the main roller portion 22b.
Is slightly larger than the outer diameter of the main roller portion 22b, and is fitted into the boss portion 22c and is in close contact with the end surface of the main roller portion 22b. here,
Since the inner diameter of the auxiliary pressing portion 22d is formed smaller than the outer diameter of the outer peripheral surface of the boss portion 22c, the auxiliary pressing portion 22d
Elastically deforms in the vicinity of the inner peripheral portion and causes a frictional force to act on the outer peripheral surface of the boss portion 22c. Further, since the spline-shaped convex portion 22e is formed on the outer peripheral surface of the boss portion 22c, the convex portion 22e bites into the inner peripheral surface of the auxiliary pressurizing portion 22d, and the auxiliary pressurizing member fitted into the boss portion 22c is inserted. The fixing force in the rotation direction of the portion 22d is increased. As a result, it is possible to reliably prevent the auxiliary pressing portion 22d from slipping on the boss portion 22c and idling with respect to the main roller portion 22b when the cut sheet P is conveyed. Also, the boss 22
As another shape of c, it is also possible to use a polygonal cross section such as a quadrangle or a hexagon.

FIG. 7 and FIG. 8 are explanatory views of the operation of conveying cut sheets in the sheet conveying path of the sheet conveying apparatus of this embodiment. The cut sheet P fed from the feed roller 4 comes into contact with the pressure roller 22 protruding from the outer guide plate 1 because the sheet transport path 3 is curved. At this time, since the outer diameter of the auxiliary pressure portion 22d of the pressure roller 22 is slightly larger than the outer diameter of the main roller portion 22b, the leading end portion of the cut sheet P is supplemented with the auxiliary pressure as shown in FIG. 7 or 8. The auxiliary pressing portion 22d is elastically deformed into a concave shape by coming into contact with the outer peripheral surface of the pressing portion 22d. Then, the tip end portion of the cut sheet P bites into the concave deformed portion in the auxiliary pressurizing portion 22d, so that the pressure roller 22 holds the tip end portion of the cut sheet P by the concave deformed portion, and the cut sheet P is cut. It can be surely curved along the curved surface of the transport path 3. As a result, even when the cut paper P has a high rigidity in the bending direction, the cut paper P does not bend and the leading end is pressed against the pressure roller 22 and bent in a bellows shape, or the cut paper P is pressed. It is possible to reliably prevent the paper conveyance path 3 from being clogged by being inserted into the gap between the guide paper 1 and the guide plate 1, and the pressure roller 22 is provided with the cut paper P.
Can be reliably rolled up into the pressure contact portion with the transport roller 6, and the cut sheet P can be reliably transported to a predetermined sheet discharge position.

Further, the pressure roller 22 of this embodiment has a simple structure in which the ring-shaped auxiliary pressure portion 22d is fitted into the boss portion 22c in addition to the conventional pressure roller. The increase is also slight.

[0019]

As described above, according to the first means of the present invention, both widthwise end portions of the pressure roller are formed by elastic auxiliary pressure portions, and the outside of the auxiliary pressure portion is formed. By making the diameter larger than the outer diameter of the main roller part, cut paper is fed to the curved paper transport path, and when the cut paper comes into contact with the pressure roller protruding from the outer guide surface, The auxiliary pressurizing part elastically deforms into a concave shape at the contact part,
The tip of the cut paper bites into the deformed part that has deformed into a concave shape,
Since the pressure roller can surely bend the cut sheet along the curved surface of the paper transport path, even if the cut sheet has a large rigidity in the bending direction, the cut sheet does not bend and the leading end portion becomes the pressure roller. Pressed and bent into a bellows shape,
It is possible to reliably prevent the cut sheet from being inserted into the gap between the pressure roller and the guide plate and jammed in the sheet conveyance path, and to reliably wind the cut sheet into the pressure contact portion with the conveyance roller by the pressure roller. Therefore, it becomes possible to reliably convey the cut sheet to a predetermined discharge position.

Further, according to the second means, the auxiliary pressurizing portion is formed in a ring shape, and the auxiliary pressurizing portion is fitted into the boss portion projecting from both side ends of the main roller portion and having an outer diameter larger than the inner diameter of the auxiliary pressurizing portion. As a result, the auxiliary pressing portion is fixed to the main roller portion by the frictional force with the boss portion, so that the auxiliary pressing portion can be fixed to the main roller portion by a simple operation.

Further, according to the third means, since the convex portion extending in the axial direction is formed on the outer peripheral surface of the boss portion, the convex portion bites into the inner peripheral surface of the auxiliary pressurizing portion and the boss portion Since the fixing force in the rotation direction of the inserted auxiliary pressing portion increases, it is possible to prevent the auxiliary pressing portion from slipping on the boss portion and idling with respect to the main roller portion when the cut sheet is conveyed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a document reading device to which an embodiment of a cut sheet conveying device of the present invention is applied.

FIG. 2 is a side sectional view showing a state in which the cut sheet conveying device of the present embodiment is opened in the document reading device shown in FIG.

FIG. 3 is a side sectional view showing a main part of the cut sheet conveying device according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a pressure roller and a guide plate in the cut sheet conveying device according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a pressure roller that is in pressure contact with a conveyance roller in the cut sheet conveyance device according to the embodiment of the present invention.

FIG. 6 is an exploded perspective view of a pressure roller in the cut sheet conveying device according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram of a cut sheet conveyance operation in a sheet conveyance path of the cut sheet conveyance device according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a cut sheet conveyance operation in the paper conveyance path of the cut sheet conveyance device according to the embodiment of the present invention.

FIG. 9 is a side sectional view showing a main part of a conventional cut sheet conveying device.

10 is a perspective view of a conveyance roller and a pressure roller in the cut sheet conveyance device shown in FIG.

FIG. 11 is a cross-sectional view for explaining a paper jam in a paper conveyance path of a conventional cut paper conveyance device.

FIG. 12 is a cross-sectional view for explaining a paper jam in a paper conveyance path of a conventional cut paper conveyance device.

[Explanation of symbols]

1, 2 ... Guide plate, 1a, 2b ... Guide surface, 3 ... Paper transport path, 4 ... Feed roller, 5 ... Separation roller, 6
... conveying rollers, 6a, 22a ... roller surface, 21 ... pickup roller, 22 ... pressurizing roller, 22b ... main roller section,
22c ... Boss portion, 22d ... Auxiliary pressure portion, 22e ... Convex portion, 24
… Top cover.

Claims (3)

[Claims] 1. A paper transport path formed between a pair of transport guide surfaces opposed to each other, a transport roller having a roller surface protruding from one of the transport guide surfaces and rotating in a transport direction, and the other transport guide. In the cut sheet conveying device, a roller surface is projected from the surface, and a pressure roller that conveys the cut sheet fed to the pressure contact portion with the conveying roller along the sheet conveying path together with the conveying roller is used. Both end portions in the width direction of the pressure roller are formed by elastic auxiliary pressure portions, and the outer diameter of the auxiliary pressure portion is larger than the outer diameter of the main roller portion inside the auxiliary pressure portion. Cut paper transport device. 2. The auxiliary pressure member is formed in a ring shape,
2. The cut sheet transporting device according to claim 1, wherein the cut roller is protruded from both side ends of the main roller portion and is fitted into a boss portion having an outer diameter larger than an inner diameter of the auxiliary pressing portion. 3. The cut sheet conveying device according to claim 2, wherein a convex portion extending in the axial direction is formed on the outer peripheral surface of the boss portion.