JP2001310837A - Sheet feeding device and image recording device using the sheet feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding device provided with a carrying means which can nip paper with responding to changes in size and prevent wear on a surface, and to provide an image recording device using the sheet feeding device. SOLUTION: In the feeding device, the width position of paper P is changed by a side registration structure with respect to a sheet carrying reference position Q, so that a nip roll 40 with a short shaft is arranged at a print margin portion 36 in the sheet carrying reference position Q side so as to oppose to a carrying roll 26. The nip roll 40 is rotatably journalled to a fixed shaft 38 arranged above a rotating shaft 28 in parallel, and disposed in a state capable of nipping the paper P with the carrying roll 26. Therefore, regardless of the size of the paper P, the paper P can be carried without making a printed portion 42 dirty. It is unnecessary to change the arranging position of the nip roll 40 according to changes of the paper P size, so that the structure of nip- carrying can be simplified without damaging surfaces of the carrying roll 26 and the nip roll 40, and cost reduction is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus for feeding sheets and an image recording apparatus using the sheet feeding apparatus.

[0002]

2. Description of the Related Art As a prior art, for example, Japanese Patent Laid-Open No.
In Japanese Patent Application Publication No. 4082, as shown in FIG. 5, a print margin portion 90 outside the recording area of the paper P is nipped by a discharge driving roll 92 and discharge driven rolls 94 and 96, so that the wet printing after printing is performed. A method is disclosed in which the image is not stained because the part 98 is not directly nipped.

[0003] On the other hand, the feeding device can generally cope with various paper sizes. For this reason, the position of the paper guide 100 moves, and the discharge driven roll 96 moves on the discharge drive roll 92, so that the nip position is changed. Even when the size of the paper P is changed, The printing section 98 which is not dried is nipped so as not to stain the image.

However, in such a configuration, when the nip position is changed in accordance with the change in the size of the paper P, there is no means for releasing the nip force. It will move as it is.

As a result, the surfaces of the discharge driven roll 96 and the discharge drive roll 92 are scratched, etc.
By repeating the movement of the discharge driven roll 96, the nip force between the discharge driven roll 96 and the discharge drive roll 92 may be reduced. Further, even if a means for releasing the nip force is provided when the nip position is changed, there is a problem that the configuration is complicated and the cost is increased as a result.

[0006]

SUMMARY OF THE INVENTION In view of the above facts, the present invention is provided with a conveying means which can nip a sheet in response to a change in the size of the sheet and does not wear the surface due to the change in the size of the sheet. It is an object to provide a sheet feeding device and an image recording device using the sheet feeding device.

[0007]

According to the first aspect of the present invention, sheets of various sizes are fed using one end of a sheet on which ink is printed as a sheet conveyance reference position. Here, a conveyance unit for nipping and conveying a print margin portion of the sheet on the sheet conveyance reference position side is provided.

By providing such a conveying means, a conveying force can be applied to the sheet without the conveying means touching the printing section regardless of the size of the sheet. Therefore,
The sheet can be conveyed without soiling the printing unit.

Further, since it is not necessary to change the position of the conveying means in accordance with the change in the size of the sheet, the structure of the nipping and conveying can be simplified without damaging the surface of the conveying means, and the cost can be reduced.

According to the second aspect of the present invention, the transporting means includes:
A transport roll disposed below the sheet to be transported and to which a driving force is transmitted, and a nip roll paired with the transport roll,
The nip roll and the transport roll nip the print margin on the sheet transport reference position side.

According to the third aspect of the present invention, the plurality of spurs for suppressing the lifting of the sheet are arranged in a state orthogonal to the sheet conveying direction. By providing the spurs as described above, it is possible to suppress the lifting of the sheet which cannot be pressed by the conveying means, thereby preventing the sheet from being skewed.

According to the fourth aspect of the present invention, the second transport roll disposed below the sheet to be transported and to which the driving force is transmitted, forms a pair with the transport roll, and transports the sheet together with the second transport roll. The second to nip the print margin on the reference position side
And the nip roll were placed close to the transport roll and the nip roll according to claim 2. As described above, by providing the nip rolls close to each other, the sheet is less likely to be skewed without providing a spur.

In addition, since it is not necessary to change the arrangement position of the second nip roll with the change in the sheet size, the surfaces of the second nip roll and the second transport roll are damaged. Therefore, the sheet transport configuration can be simplified, and the cost can be reduced.

According to the fifth aspect of the present invention, the fixed side guide is disposed at the sheet transport reference position of the placing plate on which the sheet on which ink is to be printed is placed. On the other hand, a slide side guide that slides according to the size of the sheet is disposed opposite the sheet conveyance reference position, and abuts the other end of the sheet to align the sheet with the fixed side guide.

A slide guide is disposed downstream of the slide side guide, and the slide side guide is slid by a slide means in a direction perpendicular to the sheet conveying direction to regulate the other end of the sheet. are doing. As described above, by sliding in accordance with the size of the sheet and regulating the other end of the sheet on the downstream side, the skew of the sheet is suppressed.

According to the sixth aspect of the present invention, the fixed guide is disposed downstream of the fixed side guide, and regulates one end of the sheet. In this way, by providing the fixed guide on the sheet conveyance reference position side in addition to the slide side guide, the directions of both sides of the sheet are regulated, and skew is prevented.

In the invention described in claim 7, the engaged portion is located below the slide guide, and is disposed in a direction perpendicular to the sheet conveying direction. The engaging portion provided on the slide guide is slidably engaged with the engaged portion.

A connection member is attached to the slide guide and the slide side guide. The slide operation of the slide side guide is transmitted to the slide guide by the connecting member, and the slide guide slides in the same direction as the slide side guide. As described above, since the slide guide is slid in accordance with the slide of the slide side guide using the connecting member, the configuration is simple.

According to an eighth aspect of the present invention, the sheet feeding device according to any one of the first to seventh aspects is used for an image recording apparatus for inverting and discharging a sheet.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a feeding device according to a first embodiment will be described.

As shown in FIG. 1, the feeding device 10 is provided with a mounting plate 12 on which the paper P is mounted. The feeding device 10 has a so-called side registration structure, and the recording paper P of each size is conveyed to the fixed guide 14 side by using the fixed guide 14 side as a side guide as a reference (sheet conveyance reference position Q). .

For this reason, the fixed guide 14 is
A slide guide 15 as a slide side guide is disposed opposite to the slide guide. The slide guide 15 is slidable according to the size of the sheet P, and abuts against the other end of the sheet P to align the sheet P at the time of sheet feeding together with the fixed guide 14.

A platen (not shown) is provided downstream of the mounting plate 12, and supports a sheet P to be conveyed. Further, on the downstream side of the mounting plate 12, a drive shaft 16 is disposed below the platen,
Are rotatably supported by bearings provided on side plates (not shown). A motor (not shown) is connected to the drive shaft 16, and the drive shaft 16 is rotated by driving the motor.

The drive shaft 16 has a transport roller 1 having a long axis.
8 is fixed and rotates together with the drive shaft 16. The transport roll 18 is partially exposed by a notch formed in a platen (not shown). When the paper P abuts on the transport roll 18, the transport roll 18 rotates and the downstream side of the feeding device 10 is rotated. Transported to

Further, the fixed shaft 2 is provided above the drive shaft 16.
A plurality of pinch rolls 22 are rotatably supported on the fixed shaft 20. The pinch roll 22 is arranged so that the paper P can be nipped with the transport roll 18, and is driven by the rotation of the transport roll 18. The transport roll 18 and the pinch roll 2
2, the paper P is nipped and conveyed.

As described above, the sheet P nipped and transported by the transport roll 18 and the pinch roll 22 passes below the carriage 24 which repeatedly moves in the direction of the arrow by a drive motor (not shown). At this time, the paper P is printed with ink ejected from a head (not shown) mounted on the carriage 24.

On the downstream side of the carriage 24, a long transport roll 26 is disposed below the platen. The transport roll 26 is disposed parallel to the drive shaft 16 in the transport direction of the paper P. Is fixed to the rotating shaft 28.

The transport roll 26, like the transport roll 18, is partially exposed by a notch formed in the platen, and when the paper P comes into contact with the transport roll 26, the transport device rotates with the rotation of the transport roll 26. 10 to the downstream side.

Here, a sprocket 30 is fixed to the end of the drive shaft 16. On the other hand, a sprocket 32 is also fixed to the end of the rotating shaft 28, similarly to the drive shaft 16, and a chain 34 is bridged over the sprockets 30, 32, and the sprocket 32 is interlocked with the sprocket 30. For this reason, the driving force of the motor connected to the drive shaft 16 is transmitted to the rotating shaft 28 via the sprocket 32 by the chain 34 via the sprocket 30.

On the other hand, a space that is not printed on the paper P,
A so-called print margin portion 36 is provided. In the feeding device 10, the sheet conveyance reference position Q is determined by the side registration configuration. However, the width position of the sheet P changes based on the sheet conveyance reference position Q according to the size of the sheet P. For this reason, the position of the print margin portion 37 on the slide guide 15 side changes according to the size of the sheet P, but the position of the print margin portion 36 on the sheet transport reference position Q side does not change.

Therefore, the transport roll 2 is
A nip roll 40 having a short axis is disposed opposite to the nip roll 6. The nip roll 40 is rotatably supported on a fixed shaft 38 disposed in parallel above the rotary shaft 28, and is arranged so that the paper P can be nipped with the transport roll 26. Therefore, the nip roll 40 is driven by the transport roll 26, and pinches and transports the sheet P together with the transport roll 26.

As described above, by disposing the nip roll 40 in the print margin portion 36, regardless of the size of the paper P,
The transport force can be applied to the paper P by the transport roll 26 and the nip roll 40 without touching the printing unit 42. Therefore, the paper P can be transported without soiling the printing unit 42.

Further, since it is not necessary to change the arrangement position of the nip rolls 40 in accordance with the change in the size of the paper P, the structure of the nip roll 40 can be simplified without damaging the surfaces of the transport rolls 26 and the nip rolls 40, and the cost can be reduced. Is also possible.

Next, a feeding device according to a second embodiment will be described. The description of the same contents as in the first embodiment is omitted.

As shown in FIG. 2, a plurality of spurs 44 are rotatably supported together with a nip roll 40 on a fixed shaft 38 fixed to a side plate (not shown). The spur 44 has a thin star shape, and the sharp portion 44A can come into contact with the transport roll 26. Therefore, the spur 44 follows the rotation of the transport roll 26.

Since the point of contact between the sharp portion 44A of the spur 44 and the sheet P is a point, even if the sharp portion 44A contacts the printing portion 42 of the sheet P, the formed image is not stained. By providing the spurs 44 in this manner, the floating of the paper P, which cannot be pressed by the transport roll 26 and the nip roll 40, can be suppressed, and the skew of the paper P is prevented.

Here, the sharp part 44A of the spur 44
Is allowed to contact the paper P, but it is only necessary to be able to suppress the floating of the paper P, so it is not always necessary to make contact with the paper P, and there may be a slight gap between the sharp portion 44A and the paper P. .

Next, a feeding device according to a third embodiment will be described. The description of the same contents as in the first embodiment is omitted.

As shown in FIG. 3, on the downstream side of the transport roll 26, a transport roll 46 having a long axis is disposed in parallel with the transport roll 26 along the transport direction of the sheet P. Like the transport roll 18, the transport roll 46 is also partially exposed by a notch formed in the platen, and when the paper P comes into contact with the transport roll 46, the transport roll 46 rotates and the downstream of the feeding device 55. Transported to the side.

At the end of the transport roll 46, the sprocket 4
8 is fixed. On the other hand, a sprocket 50 in addition to the sprocket 30 is fixed to the end of the drive shaft 16 along the axial direction of the drive shaft 16.

A chain 34 is laid over the sprocket 30, and the sprocket 32 fixed to the transport roll 26 and the sprocket 30 are linked.
0 has a chain 52 spanned thereon, and a sprocket 5
0 and the sprocket 48 are linked.

Thus, the driving force of the drive shaft 16 is transmitted to the rotary shaft 28 via the sprocket 32 by the chain 34 via the sprocket 30, and the rotary shaft 56 via the sprocket 48 by the chain 52 via the sprocket 50. Is transmitted to

On the other hand, the transport roll 46 is provided with a nip roll 54 having a short axis. The nip roll 54 is disposed so as to face the nip roll 40 and, like the nip roll 40, is located in the print margin portion 36.

The nip roll 54 is rotatably supported by a fixed shaft 56 disposed in parallel above the rotary shaft 28, and is arranged so as to be nip with respect to the transport roll 46.

For this reason, the nip roll 54 is driven by the transport roll 46 to pinch and transport the paper P together with the transport roll 46. In this way, by providing the nip rolls 40 and 54 close to each other, the paper P is less likely to be skewed without providing the spur 44 (see FIG. 2).

Further, similarly to the nip roll 40, it is not necessary to change the disposition position of the nip roll 54 in accordance with the change in the size of the paper P, so that the surfaces of the transport roll 46 and the nip roll 54 are not damaged and the transport of the paper P is performed. The configuration can be simplified and the cost can be reduced.

Next, a feeding device according to a fourth embodiment will be described. The description of the same contents as in the first embodiment is omitted.

As shown in FIG. 4, an L-shaped fixed guide 58 is disposed on the sheet transport reference position Q side located between the transport roll 18 and the print head 24. The fixed guide 58 is fixed to a pedestal (not shown) of the feeding device 60, and the bottom surface of the fixed guide 58 supports the print margin portion 36.

The bottom surface of the fixed guide 58 is flush with the platen surface by a notch formed in a platen (not shown).
Is prevented from entering between the platen surface and the fixed guide 58. In addition, the edge of the sheet P slides on the side surface of the fixed guide 58, and the skew of the sheet P is prevented.

On the other hand, an L-shaped slide guide 59 is provided downstream of the transport roll 26 so as to face the fixed guide 58. The slide guide 59 is slidable along a rail 80 (described later) according to the size of the sheet P.

Here, the slide means will be described.
A chain 62 is attached to a lower portion of the slide guide 15, and the chain 62 is pulled in the direction of the arrow according to the slide of the slide guide 15 (in the direction of the arrow).

The chain 62 extends over sprockets 64 and 66 disposed on the left and right sides of the mounting plate 12, and the sprockets 64 and 66 are rotatably supported by fixed shafts 68 and 70, respectively.

Further, sprockets 72 and 74 are provided on the left and right below the downstream side of the transport roll 26, respectively, and are rotatably supported by fixed shafts 76 and 78, respectively. The chains 62, which are bridged between the sprockets 64, 66, are crossed over the sprockets 72, 74.

Further, between the sprocket 72 and the sprocket 74, a rail 80 is provided along a direction perpendicular to the direction in which the sheet P is conveyed. On the other hand, at the lower part of the slide guide 59, an engagement portion 82 that can be engaged with the rail 80 is provided in a protruding manner, and is slidable along the rail 80.

A chain 62 is attached to a lower portion of the slide guide 59, and the slide guide 59 slides along the rail 80 in accordance with the pulling direction of the chain 62.

With such a configuration, the slide guide 1
5 is slid, the chain 62 is pulled, and the slide guide 59 slides in the direction of the arrow. As described above, the slide guide 59 is disposed on the upstream side of the print head 24, the slide guide 15 is disposed on the downstream side of the print head 24, and both sides of the paper P are used. The orientation is regulated, and the skew of the paper P is suppressed.

In this case, using the chain 62,
Although the slide guide 59 is slid, the slide guide 59 may be slid together with the slide of the slide guide 15, and the present invention is not limited to this, and a link mechanism or the like may be used.

Further, the present invention is not limited to each embodiment, and a combination of each embodiment can of course achieve the object. Further, each of the embodiments may be applied to an image recording apparatus that reverses and discharges a sheet.

[0059]

According to the present invention having the above-described structure, according to the first and second aspects of the present invention, regardless of the size of the sheet, the conveying means applies the conveying force to the sheet without touching the printing section. Can be granted. Therefore, the sheet can be conveyed without soiling the printing unit. Further, since it is not necessary to change the arrangement position of the conveying means in accordance with the change in the size of the sheet, the configuration of the nipping and conveying can be simplified without damaging the surface of the conveying means, and the cost can be reduced.

According to the third aspect of the present invention, the lifting of the sheet which cannot be pressed by the conveying means can be suppressed, and the skew of the sheet is prevented. According to the fourth aspect of the invention, the seat is less likely to be skewed without providing a spur. Further, in accordance with the change in the size of the sheet, it is not necessary to change the disposition position of the second nip roll, as in claim 2, without damaging the surfaces of the second nip roll and the second transport roll. The sheet conveyance configuration can be simplified, and the cost can be reduced.

According to the fifth aspect of the present invention, the skew of the sheet is suppressed by sliding in accordance with the size of the sheet and regulating the other end of the sheet on the downstream side. According to the sixth aspect of the invention, by providing the fixed guide separately from the slide guide, the directions of both sides of the sheet are regulated, and skew is prevented. According to the seventh aspect of the present invention, since the slide guide is merely slid in accordance with the slide of the slide side guide using the connecting member, the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a feeding device according to a first embodiment.

FIG. 2 is a perspective view showing a feeding device according to a second embodiment.

FIG. 3 is a perspective view showing a feeding device according to a third embodiment.

FIG. 4 is a perspective view showing a feeding device according to a fourth embodiment.

FIG. 5 is a perspective view showing a conventional feeding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Feeding device 14 Fixed guide (side guide) 15 Slide guide (slide side guide) 16 Drive shaft (transportation means) 26 Transport roll (transportation means) 28 Rotary shaft (transportation means) 30 Sprocket (transportation means) 32 Sprocket (transportation) Means) 34 Chain (conveying means) 36 Print margin 38 Rotary shaft (conveying means) 40 Nip roll (conveying means) 44 Spur 46 Conveying roll (second conveying roll (conveying means)) 48 Sprocket (conveying means) 50 Sprocket ( Conveying means) 52 Chain (conveying means) 54 Nip roll (second nip roll (conveying means)) 55 Feeding device 56 Fixed shaft (conveying means) 58 Fixed guide (fixed guide) 59 Slide guide (slide guide) 60 Feeding device 62 chain (connecting member (slide means)) 4 Sprocket (slide means) 68 Fixed shaft (slide means) 72 Sprocket (slide means) 74 Sprocket (slide means) 76 Fixed shaft (slide means) 80 Rail (engaged part (slide means)) 82 Engagement part (slide) means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65H 9/00 B65H 9/00 A F term (Reference) 3F049 AA01 DA11 DA12 DA13 LA07 LB03 3F101 LA02 LB03 3F102 AA11 AB01 BA02 BB04 DA03 FA03 3F343 FA02 HE04 HE23

Claims (8)

[Claims] 1. A sheet feeding apparatus for feeding sheets of various sizes with one end of a sheet on which ink is printed as a sheet conveyance reference position, wherein printing of the sheet on the sheet conveyance reference position side is performed. A sheet feeding device provided with a conveying means for nipping and conveying a margin portion. 2. The printing device according to claim 1, wherein the conveying unit is disposed below the sheet to be conveyed, the conveying roll transmitting a driving force, and a pair of the conveying roll, and the printing margin on the sheet conveying reference position side. The sheet feeding device according to claim 1, comprising: a nip roll that nips the portion. 3. The sheet feeding device according to claim 1, wherein a plurality of spurs for suppressing the lifting of the sheet are arranged in a state perpendicular to a conveying direction of the sheet. 4. A second conveying roll disposed below the conveyed sheet and transmitting a driving force, and a pair of the second conveying roll and the printing on the sheet conveying reference position side The sheet according to claim 2, further comprising: a second nip roll that nips a margin portion, wherein the second transport roll and the second nip roll are provided near the transport roll and the nip roll. Feeding device. 5. A fixed side guide provided on a mounting plate on which a sheet on which ink is to be printed is mounted, and disposed at the sheet transport reference position, and disposed opposite to the sheet transport reference position; Slide according to the size and touch the other end of the sheet,
A slide side guide for aligning the sheet with the fixed side guide; a slide guide disposed downstream of the slide side guide to regulate the other end of the sheet; and a slide guide orthogonal to the sheet conveyance direction. The sheet feeding device according to claim 1, further comprising: a slide unit configured to slide in a direction in which the sheet is fed. 6. The sheet feeding device according to claim 5, wherein a fixed guide is provided downstream of the fixed side guide and regulates one end of the sheet. 7. The slide unit, wherein: an engagement portion provided on the slide guide; and an engagement portion disposed below the slide guide, and disposed in a direction orthogonal to a sheet conveying direction. A part to be slidably engaged with the slide guide, the slide guide being attached to the slide guide and the slide side guide, transmitting the slide operation of the slide side guide to the slide guide, and sliding in the same direction as the slide side guide. The sheet feeding device according to claim 5, further comprising: a connecting member that slides the sheet. 8. An image recording apparatus for reversing and discharging a sheet, wherein the sheet feeding apparatus according to claim 1 is used.