JP2002114404A - Sheet carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of jamming by using a small number of guide rollers when changing the carrying direction of color paper. SOLUTION: A turn carriage part 11 comprises a feed roller 30, press rollers 31 and 32, a turn guide 33 and guide rollers 34 and 35. A first line segment A1 is formed by connecting an intersection P1 of a roller circumferential surface 35a of the downstream side guide roller 35 with a paper guide surface 33c of the turn guide 33 to a center C1 of the downstream side guide roller 35. A second line segment B1 is a tangential line extended from the intersection P1 to a contact point S1 so as to be brought into contact with a circumferential surface 34a of the upstream side guide roller 34. The turn guide 33 and the two guide rollers 34 and 35 are arranged so as to realize a positional relationship that the angle θ1 of intersection between the first and second line segments A1 and B1 is below 180 deg.. The color paper 26 is smoothly fed while a tip of the color paper 26 is not hooked by the guide rollers 34 and 35 and the turn guide 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus, and more particularly, to a sheet conveying apparatus that changes a conveying direction of a sheet such as photographic paper.

[0002]

2. Description of the Related Art In various printers and the like, in order to efficiently arrange a recording paper magazine, a cutter unit, a print unit, and the like, a sheet conveyance path is set by using a turn guide.
Bend to 180 degrees or 180 degrees. This turn guide is composed of a curved guide plate. The turn guide is provided with a plurality of guide rollers, guide protrusions, and the like so that the leading end of the sheet does not stick or stick.

[0003]

By the way, in order to arrange the sheets smoothly, it is sufficient to arrange guide rollers at high density on the turn guide. However, increasing the number of guide rollers leads to an increase in the number of components, and it is necessary to form an opening for projecting the guide rollers in the turn guide. For this reason, there is a problem that the manufacturing cost increases. In addition, if the number of guide rollers is reduced to reduce the manufacturing cost, the leading end of the sheet will stick near the intersection of the turn guide and the guide roller, causing a sheet jam.

[0004] The present invention is to solve the above problems,
By optimizing the positional relationship between the turn guide, the guide roller provided in the turn guide, and the sheet feeding member located upstream or downstream of the guide roller, the number of parts can be reduced, and the occurrence of sheet jams can be reduced. It is an object of the present invention to provide a sheet conveying device capable of suppressing the sheet conveyance.

[0005]

According to a first aspect of the present invention, there is provided a sheet conveying apparatus, comprising: a turn guide for changing a sheet feeding direction; In a sheet conveying apparatus having a plurality of guide rollers that are rotatable in the sheet feeding direction and that are provided apart from each other in the sheet feeding direction, the upstream guide roller, the downstream guide roller, and the upstream guide roller that are adjacent in the sheet feeding direction. A first guide connecting an intersection of a sheet guide surface of the turn guide and a roller peripheral surface of the downstream guide roller with a center point of the guide roller when viewed from the rotation axis direction of the guide roller; Intersection of a line segment and a second line segment extending from the intersection so as to be in contact with the peripheral surface of the downstream guide roller on the side opposite to the sheet passing side. Degrees and so that the positional relationship to be less than 180 degrees, the turn guide, upstream guide roller,
A downstream guide roller is provided.

According to a second aspect of the present invention, there is provided an inlet-side sheet feeding member for feeding the sheet into the turn guide, and the inlet-side sheet feeding member and the guide roller adjacent to the downstream side thereof are provided. It is preferable that a positional relationship between the first line segment and the second line segment is set to be less than 180 degrees between the first line segment and the second line segment on the side opposite to the sheet passing side. In this case, it is possible to suppress sheet jamming between the entrance-side sheet feeding member and the guide roller.

According to a third aspect of the present invention, there is provided a sheet transporting device for delivering the sheet from the turn guide, wherein the exit-side sheet feeding member and the guide roller adjacent to the upstream side are provided. It is preferable that a positional relationship between the first line segment and the second line segment is set to be less than 180 degrees between the first line segment and the second line segment on the side opposite to the sheet passing side. In this case, it is possible to suppress sheet jamming between the guide roller and the outlet-side sheet feeding member.

Further, as in the sheet conveying apparatus according to the fourth aspect, the entrance-side sheet feeding member or the exit-side sheet feeding member may be constituted by a pair of feed rollers rotating by bringing a pair of feed rollers into contact. preferable. Further, as in the sheet conveying device according to the fifth aspect, the entrance-side sheet feeding member and the exit-side sheet feeding member are provided with one feed roller and two feed rollers separated from each other on a peripheral surface of the feed roller. It is preferable that the turn guide is configured so as to cover the peripheral surface of the feed roller between the press rollers.

Further, the number of guide rollers disposed on the turn guide may be one or more, and an appropriate number of guide rollers may be provided. Alternatively, the first line segment and the second line segment may be arranged so that the intersection angle between the first line segment and the second line segment satisfies the above condition with the sheet feeding member arranged on the downstream side.

[0010]

FIG. 1 is a schematic diagram showing a printer processor. The printer processor 7 includes a printer 8 and a processor 9 connected to each other. Printer 8
A paper loading section 10, a paper transport section 13 having turn transport sections 11 and 12 as a sheet transport apparatus of the present invention,
Paper cutter 14, back printing unit 15, exposure recording unit 16,
It comprises a paper sorting unit 17. The processor 9 includes a development processing section 20, a drying section 21, and an accumulation section 22.

The paper loading section 10 is loaded with a paper magazine 24 in which a long strip of long color paper (photosensitive material) 23 is wound and stored. Paper magazine 24
Inside, a paper feed roller pair 25 is arranged. The feed roller pair 25 is rotated by a not-shown feed drive motor on the printer side. The long color paper 23 pulled out by the paper feed roller pair 25 is
Is cut into the required length, and the cut sheet-shaped color paper 26 is formed. The color paper 26 is transferred to the back printing unit 15, the exposure recording unit 16,
The paper is sequentially sent to the paper sorting unit 17.

In the back printing unit 15, necessary information is printed on the back surface of the color paper 26 (the surface opposite to the emulsion layer). In the exposure recording section 16, an image is exposed and recorded on the color paper 26 based on the image information by the laser printer. The exposed and recorded color paper 26 is sorted into a plurality of rows by the paper sorting unit 17 and enters the processor 9. Then, development processing such as color development, bleach-fixing, and stabilization is performed by each of the processing tanks 20 a to 20 f of the processor 9, and is sent to the accumulation unit 22 while being dried in the drying unit 21. In the stacking unit 22, the color papers 26 processed and sent in a plurality of rows are stacked into one. Note that reference numeral 28
Indicates a paper transport path in the printer processor 7.

FIG. 2 is an enlarged front view showing the turn transport section 11 of the present invention, and FIG. 3 is a sectional view in FIG. The turn transport unit 12 is configured similarly to the turn transport unit 11 except that the turn transport unit 11 is mounted in a different direction.

The turn transport section 11 includes a feed roller 30 and
It is composed of pressing rollers 31, 32, a turn guide 33, and guide rollers 34, 35. The feed roller 30 is formed of a roller whose peripheral surface is rubber-lined. The pressing rollers 31, 32 are also formed of rubber-lined rollers, and contact the peripheral surface of the feed roller 30 to pinch and convey the color paper 26. In the present embodiment, the conveying direction of the color paper 26 is changed by 90 degrees, and the two pressing rollers 31 and 32
It is disposed on the feed roller 30 at a distance of 0 degrees.

The pressing rollers 31 and 32 are
The eccentricity is set to be slightly eccentric with respect to the center of 0 in the color paper feed direction.
Is 2 mm in this embodiment. The amount of eccentricity E defines an intersection angle θ2 that defines the positional relationship between guide rollers 34 and 35 and press rollers 31 and 32, which will be described later.
θ4 can be reliably secured in a preferable range. The pressing rollers 31, 32 are skewed rollers, and have a shape in which the roller bodies 31a, 32a are separated in the axial direction.

The turn guide 33 has two press rollers 3
The turn guide 33 and the feed roller 3 are disposed so as to cover the peripheral surface of the feed roller 30 sandwiched between the feed rollers 1 and 32.
The gap between the peripheral surfaces of the color paper 26 is a conveyance path for the color paper 26. Guide rollers 34 and 35 are arranged on the turn guide 33 between the pressing rollers 31 and 32.

As shown in FIG. 3, guide rollers 34, 3
5 are arranged at two positions in the feed direction of the color paper 26 in the present embodiment. This guide roller 3
Reference numerals 4 and 35 each include a free roller having a short length. In the width direction of the color paper 26, for example, 6 to 7 pieces are arranged corresponding to the width of the color paper 26. The length and number of rollers may be changed as appropriate. The guide rollers 34 and 35 are the turn guide 3
The shaft part is held by the mounting bracket 36 formed in 3. The guide rollers 34 and 35 are configured to freely rotate with respect to the mounting shaft.

The both ends of the turn guide 33 in the color paper feed direction are linearly extended,
3a and 33b are formed. The extension portions 33a, 3
Feed rollers 37 and 38 having the same size as the pressing rollers 31 and 32 are arranged in 3b. In addition, a guide roller 39 is disposed between the feed roller 38 on the outlet side and the pressing rollers 31 and 32. Reference numerals 40 and 41
Is a guide plate for supporting and guiding the color paper 26.

In this embodiment, the diameter of the feed roller 30 is 60 mm, the pressing rollers 31, 32, and the feed rollers 37, 3
Although the diameter of 8 is 30 mm and the diameter of the guide rollers 34, 35 and 39 is 12 mm, these dimensions may be changed as appropriate. Further, the gap between the peripheral surface 30a of the feed roller 30 and the paper guide surface 33c of the turn guide 33 is set to 3 mm. However, the interval of the gap may be appropriately changed according to the type of the color paper 26 and the like.

FIG. 4 is an enlarged explanatory view showing a main part of the present invention. The turn guide 33 and the guide rollers 34 and 3 are shown.
5 shows a positional relationship with the fifth embodiment. First, a connection is established from the intersection P1 between the roller peripheral surface 35a of the downstream guide roller 35 and the paper guide surface 33c of the turn guide 33 to the center point C1 of the downstream guide roller 35, and this is defined as a first line segment A1. . Further, the peripheral surface 34 of the upstream side guide roller 34
A tangent line extending from the intersection P1 to the contact point S1 so as to be in contact with a is defined as a second line segment B1. And these first
And the turn guide 33 and the two guide rollers 34, 35 such that the intersection angle θ1 on the opposite side of the paper passing side at the intersection of the second line segments A1, B1 is less than 180 degrees. And place.

Similarly, a pressing roller 31 constituting a pair of entrance side paper feed rollers and a pressing roller 3
As described above, the intersection angle θ2 between the first line segment A2 and the second line segment B2 between the adjacent guide roller 34 on the downstream side of
Are arranged so that is less than 180 degrees. The first line segment A2 is a line segment connecting the intersection P2 between the roller peripheral surface 34a of the upstream guide roller 34 and the paper guide surface 33c of the turn guide 33 to the center point C2 of the upstream guide roller 34. is there. Also, the second line segment B2
Is a tangent extending from the intersection P2 to the contact point S2 so as to contact the peripheral surface 31a of the pressing roller 31. The intersection angle θ2 is the intersection angle between the first line segment A2 and the second line segment B2, and is the intersection angle on the side opposite to the paper passage side.

Similarly, between the pressing roller 32 of the outlet side paper feed roller pair and the guide roller 35 adjacent upstream of the pressing roller 32, the first line segment A3 and the second line These are arranged so that the intersection angle θ3 with the minute B3 is less than 180 degrees. The first line segment A3 is a line segment connecting the intersection P3 between the roller peripheral surface 32a of the outlet side pressing roller 32 and the paper guide surface 33c of the turn guide 33 to the center point C3 of the outlet side pressing roller 32. is there. The second line segment B3 is a tangent line extending from the intersection P3 to the contact point S3 so as to contact the peripheral surface 35a of the downstream guide roller 35. Crossing angle θ3
Is the intersection angle between the first line segment A3 and the second line segment B3, and is the intersection angle on the side opposite to the paper passing side.

By maintaining the positional relationship of the intersection angle θ1 as described above, the leading end of the color paper which has been guided in contact with the upstream guide roller 34 is always in contact with the downstream guide roller 35 and the turn guide 33. Since the contact is made below the intersection P <b> 1, the leading end of the color paper does not hit the guide roller 35 or the turn guide 33. In addition, since the guide roller 35 rotates in the paper feeding direction according to the feeding of the color paper, the color paper can be fed smoothly. Similarly,
By maintaining the positional relationship of intersection angles θ2 and θ3,
Paper clogging between the guide rollers 34 and 35 and the pressing rollers 31 and 32 is suppressed. When the intersection angles θ1, θ2, and θ3 are 180 degrees or more, the incidence of locking of the leading end of the color paper at the intersection or turn guide between the turn guide and the downstream guide roller or the like increases, which causes paper jam. Becomes

The above-mentioned intersection angles θ1, θ2, θ3 are:
Preferably, 100 degrees <θ <170 degrees, and more preferably, 100 degrees <θ <135 degrees (θ = θ1, θ
2, θ3).

In the above embodiment, the feed direction of the color paper 26 is changed by 90 degrees so that the turn guide 33 covers the peripheral surface of the feed roller 30 by 90 degrees. However, the angle of change of the feed direction is 90 degrees. Without limitation, 4
The angle may be 5 degrees, 60 degrees, 135 degrees, 180 degrees, or any other angle.

In the above embodiment, the number of guide rollers in the paper feeding direction is two, but the number may be one or more. In the case of one guide roller, FIG.
As shown in the figure, the pressing roller 31 of the upstream feed roller pair
Between the first line segment A4 and the second line segment B4 between the first line segment A4 and the second line segment B4 between the guide roller 50 and the press roller 32 and the guide roller 50 of the downstream side feed roller pair, as in the above embodiment. These rollers 3 are adjusted so that θ4 or the intersection angle θ5 between the first line segment A5 and the second line segment B5 is less than 180 degrees.
1, 32, 50 and the turn guide 51 are arranged. Note that the same components as those shown in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

In the above embodiment, one feed roller 30 and two pressing rollers 31, 32 rotating in contact with the feed roller 30 are provided.
Thus, the entrance side feed roller pair and the exit side feed roller pair are configured, but these may be configured using separate feed rollers.

In the above embodiment, the present invention is applied to a digital printer which prints and exposes color paper. However, the present invention can be applied to a digital printer which conveys a sheet. For example, the present invention may be applied to various printers such as a thermal development transfer type printer, an ink jet printer, a thermal printer, and a printer for printing on an instant film using an optical head, in addition to a silver halide color printer.

[0029]

According to the present invention, between the upstream guide roller, the downstream guide roller, and the turn guide adjacent in the sheet feeding direction, the sheet of the turn guide is viewed from the rotation axis direction of the guide roller. A first line segment connecting the intersection of the guide surface and the roller peripheral surface of the downstream guide roller with the center point of the downstream guide roller, and extending from the intersection so as to be in contact with the peripheral surface of the upstream guide roller. The turn guide, the upstream guide roller, and the downstream guide roller are arranged such that the crossing angle between the second line segment and the opposite side of the sheet passing side is less than 180 degrees. The leading end of the sheet that has passed through the upstream guide roller always comes into contact with the downstream guide roller at a position below the intersection. Therefore, the sheet tip does not get caught on the guide roller or turn guide,
Sheet feeding can be performed smoothly. Further, even if the leading edge of the sheet abuts on the downstream guide roller, the downstream guide roller rotates in the sheet feeding direction due to the abutting of the leading edge of the sheet, so that the leading edge of the sheet is not locked at this portion. . In addition, since the guide rollers and the turn guides may be arranged so as to satisfy the above relationship, there is no need to dispose a large number of guide rollers in waste, and it is possible to provide a sheet conveying apparatus with a small number of guide rollers and without jamming. . Furthermore, when used as a sheet transport device for photographic paper or the like, film peeling due to engagement of the leading edge of the sheet is eliminated, and high-quality prints can be created.

Similarly, an entrance side sheet feeding member for feeding the sheet to the turn guide is provided, and between the entrance side sheet feeding member and a downstream adjacent guide roller adjacent to the downstream side and the turn guide. Since the positional relationship between the first line segment and the second line segment on the side opposite to the sheet passing side is set to be less than 180 degrees, the entrance side sheet feeding member, the guide roller, and the turn are similarly formed. Sheet clogging can be eliminated between the sheet and the guide.

An outlet-side sheet feeding member for feeding the sheet from the turn guide is provided, and the outlet-side sheet feeding member, an upstream adjacent guide roller adjacent to the upstream side, and the turn guide are disposed between the outlet side sheet feeding member and the upstream adjacent guide roller. 1 line segment and 2nd line
The intersection angle of the line segment with the side opposite to the sheet passing side is set to 180.
Since the positional relationship is set to be less than the degree, the sheet jam can be similarly eliminated between the exit side sheet feeding member, the guide roller, and the turn guide.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a printer processor having a sheet conveying device according to the present invention.

FIG. 2 is an enlarged front view showing a turn transport unit.

FIG. 3 is a sectional view taken along line III-III in FIG. 2 for explaining a positional relationship between a turn guide and a guide roller.

FIG. 4 is an explanatory diagram showing a positional relationship among a turn guide, a pressing roller, and a guide roller.

FIG. 5 is an explanatory diagram illustrating a positional relationship among a turn guide, a pressing roller, and a guide roller in another embodiment using one guide roller.

[Explanation of symbols]

 7 Printer Processor 11, 12 Turn Transport Unit 13 Paper Transport Unit 16 Exposure Recording Unit 26 Color Paper 30 Feed Roller 31, 32 Press Roller 33, 51 Turn Guide 34, 35, 50 Guide Roller P1-P5 Intersection C1-C5 Center Point A1 A1 First line segment B1 to B5 Second line segment θ1 to θ5 Intersection angle

Claims (8)

[Claims] 1. A turn guide for changing a sheet feeding direction, a part of which is provided so as to protrude from the turn guide, is rotatable in the sheet feeding direction, and is provided plurally apart in the sheet feeding direction. A sheet conveying device provided with a guide roller that is disposed between an upstream guide roller, a downstream guide roller, and the turn guide that are adjacent to each other in the sheet feeding direction, as viewed from a rotation axis direction of the guide roller. The first line segment connecting the intersection of the sheet guide surface of the turn guide and the roller peripheral surface of the downstream guide roller and the center point of the downstream guide roller, and the first line segment contacting the peripheral surface of the upstream guide roller. The turn guide so that an intersection angle between the second line segment extended from the intersection and the opposite side to the sheet passing side is less than 180 degrees. A sheet conveying device comprising an upstream guide roller and a downstream guide roller. 2. An inlet-side sheet feeding member for feeding the sheet into the turn guide, wherein the downstream side guide roller is located between the inlet-side sheet feeding member, a downstream adjacent guide roller adjacent to the downstream side, and the turn guide. A first line segment connecting an intersection of a sheet guide surface of the turn guide and a roller peripheral surface of the downstream adjacent guide roller and a center point of the downstream adjacent guide roller when viewed from the rotation axis direction of the adjacent guide roller; And a second line segment extending from the intersection so as to be in contact with the peripheral surface of the entrance-side sheet feeding member has a positional relationship in which the intersection angle on the opposite side to the sheet passing side is less than 180 degrees. The sheet conveying device according to claim 1, wherein 3. An outlet sheet feeding member for feeding said sheet from said turn guide, wherein said upstream sheet guide member is located between said outlet sheet feeding member and an upstream adjacent guide roller adjacent to said upstream side and said turn guide. A first line segment connecting the intersection of the sheet guide surface of the turn guide and the peripheral surface of the outlet-side sheet feeding member and the center point of the outlet-side sheet feeding member when viewed from the rotation axis direction of the side adjacent guide roller; And a second line segment extending from the intersection so as to be in contact with the peripheral surface of the guide roller adjacent to the upstream side. The sheet conveying device according to claim 1, wherein 4. The sheet conveying apparatus according to claim 2, wherein the entrance-side sheet feeding member or the exit-side sheet feeding member is constituted by a pair of feed rollers that rotate by contacting a pair of feed rollers. . 5. The sheet feeding member on the entrance side and the sheet feeding member on the exit side are constituted by one feed roller and two press rollers arranged separately on the peripheral surface of the feed roller. 5. The sheet conveying device according to claim 4, wherein the turn guide is disposed so as to cover a peripheral surface of the feed roller between the rollers. 6. A turn guide for changing a sheet feeding direction, a guide roller partially provided from the turn guide and rotatable in the sheet feeding direction.
A sheet conveying device having an entrance side sheet feeding member for nipping the sheet and feeding the sheet to the turn guide, wherein the sheet guide surface of the turn guide and the guide roller of the guide roller are viewed from the rotation axis direction of the guide roller. A first line segment connecting the intersection of the roller peripheral surface and the center point of the guide roller, and extending from the intersection so as to be in contact with the peripheral surface of the sheet feeding member upstream of the guide roller in the sheet feeding direction. The turn guide, the guide roller, and the entrance-side sheet feeding member are arranged so that the crossing angle of the opposite side to the sheet passing side with the flattened second line segment is less than 180 degrees. Characteristic sheet conveying device. 7. An exit sheet feeding member for sandwiching the sheet and feeding the sheet from the turn guide is provided on a sheet exit side of the turn guide, and the exit sheet feeding member is rotated by contacting a pair of feed rollers. A feed roller pair, the feed roller disposed on the turn guide side, the guide roller disposed on the upstream side in the sheet feeding direction with respect to the feed roller, and the turn guide, A first connecting the intersection of the sheet guide surface of the turn guide and the peripheral surface of the outlet side feed roller and the center point of the outlet side feed roller when viewed from the rotation axis direction of the guide roller.
And a second line segment extending from the intersection so as to be in contact with the peripheral surface of the guide roller has a positional relationship in which the intersection angle on the side opposite to the sheet passing side is less than 180 degrees. The sheet conveying device according to claim 6, wherein 8. A plurality of the guide rollers are provided in a sheet feeding direction, and between an upstream guide roller, a downstream guide roller, and the turn guide adjacent in the sheet feeding direction, a rotation axis direction of the guide roller. A first line segment connecting an intersection of a sheet guide surface of the turn guide and a roller peripheral surface of the downstream guide roller and a center point of the downstream guide roller, and a peripheral surface of the upstream guide roller. The turn guide and the upstream guide roller so as to have a positional relationship with the second line segment extended from the intersection so as to be in contact with the sheet passing side with the second line segment being less than 180 degrees. 8. The sheet conveying apparatus according to claim 6, further comprising a downstream guide roller.