Drying device

Abstract

To provide a drying device which inhibits lifting of a sheet while blowing air to dry the sheet.SOLUTION: A drying device includes: a hot air blowing unit 8A having a plurality of blowing nozzles 10A and a first flow duct 14A; and a hot air blowing unit 8B located adjacent to a downstream of the hot air blowing unit 8A with respect to a sheet transport direction D1 and having a plurality of blowing nozzles 10B and a second flow duct 14B. When a pitch between an arbitrary first hole 10a of the plurality of blowing nozzles 10A and a second hole 10b which is located at the downstream of the first hole 10a in the sheet transport direction D1 and has a shortest distance from the first hole 10a with respect to the sheet transport direction D1 is referred to as a first pitch p1, with respect to the sheet transport direction D1, a second pitch p2 between a downstream end hole 10Aa located at a downstream end of the plurality of blowing nozzles 10A and an upstream end hole 10Ba located at an upstream end of the plurality of blowing nozzles 10B is smaller than or equal to the first pitch p1.SELECTED DRAWING: Figure 10

Claims

[Claim 1] A drying apparatus that blows hot air onto a sheet on which an image has been formed by ejecting ink to dry the sheet, A conveyor belt for transporting the sheets, A first air blowing unit having a plurality of first air outlets that blow air toward a sheet being conveyed by the conveyor belt, and a first duct that guides the air toward the first air outlets, The second blower unit is positioned adjacent to the first blower unit downstream with respect to the sheet conveying direction and has a plurality of second outlets that blow air toward the sheet being conveyed by the conveyor belt, and a second duct that guides the air toward the second outlets. The plurality of first discharge holes include a first hole, a second hole located downstream of the first hole in the sheet conveying direction and having the shortest distance to the first hole in the sheet conveying direction, and a third hole located furthest downstream in the sheet conveying direction, wherein the pitch between the first hole and the second hole in the sheet conveying direction is a first pitch. The plurality of second discharge holes include a fourth hole located at the uppermost position in the sheet transport direction, and the pitch between the third hole and the fourth hole in the sheet transport direction is the second pitch. The second pitch is less than or equal to the first pitch. A drying apparatus characterized by the following features. [Claim 2] The first blower unit is positioned opposite the conveyor belt and has a first blowing surface in which the plurality of first blowing holes are formed, The second blower unit is positioned opposite the conveyor belt and has a second blowing surface in which the plurality of second blowing holes are formed. The downstream end of the first discharge surface in the sheet conveying direction has at least one first portion in which the third hole is formed, and a second portion located upstream of the first portion in the sheet conveying direction. The upstream end of the second discharge surface in the sheet transport direction has at least one third portion in which the fourth hole is formed, and a fourth portion located downstream of the third portion in the sheet transport direction. With respect to the sheet transport direction, the first portion faces the fourth portion, and the second portion faces the third portion. When viewed from the sheet width direction intersecting the sheet transport direction, at least a portion of the first portion and at least a portion of the third portion overlap. The drying apparatus according to feature 1. [Claim 3] The aforementioned Part 1 consists of multiple parts. The aforementioned third part has multiple parts. The plurality of first portions and the plurality of third portions are arranged alternately with respect to the sheet width direction. The drying apparatus according to feature 2. [Claim 4] The plurality of first outlet holes of the first blower unit include a first group of first outlet holes arranged in a row along the sheet transport direction, and a second group of first outlet holes arranged in a row along the sheet transport direction at different positions in the sheet width direction intersecting the sheet transport direction from the first group. Viewed from the sheet width direction, the first discharge holes of the first group and the first discharge holes of the second group are arranged alternately in the sheet transport direction. The first pitch is the pitch in the sheet transport direction between the first discharge holes of the first group and the first discharge holes of the second group, which are aligned with respect to the first discharge holes in the sheet transport direction, as viewed from the sheet width direction. The drying apparatus according to feature 1. [Claim 5] The first pitch is 5 mm or more and 10 mm or less. The drying apparatus according to feature 1. [Claim 6] The first pitch is the distance between a straight line parallel to the sheet width direction perpendicular to the sheet transport direction and passing through the first hole, and a straight line parallel to the sheet width direction and passing through the second hole. The second pitch is the distance between a straight line parallel to the sheet width direction and passing through the third hole, and a straight line parallel to the sheet width direction and passing through the fourth hole. The drying apparatus according to feature 1. [Claim 7] The fourth hole and the second blowout hole excluding the fourth hole are arranged so as not to overlap each other in the sheet transport direction. The drying apparatus according to feature 1. [Claim 8] A drying apparatus that blows hot air onto a sheet on which an image has been formed by ejecting ink to dry the sheet, A conveyor belt for transporting the sheets, A first air blowing unit having a plurality of first air outlets that blow air toward a sheet being conveyed by the conveyor belt, and a first duct that guides the air toward the first air outlets, The second blower unit is positioned adjacent to the first blower unit downstream with respect to the sheet conveying direction and has a plurality of second outlets that blow air toward the sheet being conveyed by the conveyor belt, and a second duct that guides the air toward the second outlets. The average length of the pitch of the plurality of first discharge holes in the sheet transport direction is greater than or equal to the pitch between the third hole located furthest downstream of the plurality of first discharge holes and the fourth hole located furthest upstream of the plurality of second discharge holes, with respect to the sheet transport direction. A drying apparatus characterized by the following features. [Claim 9] A drying apparatus for drying a sheet by blowing hot air onto a sheet on which an image has been formed by ejecting ink, A conveyor belt for transporting the sheets, A first air blowing unit having a plurality of first air outlets that blow air toward a sheet being conveyed by the conveyor belt, and a first duct that guides the air toward the first air outlets, The second blower unit is positioned adjacent to the first blower unit downstream with respect to the sheet conveying direction and has a plurality of second outlets that blow air toward the sheet being conveyed by the conveyor belt, and a second duct that guides the air toward the second outlets. The aforementioned plurality of second outlet holes are, A plurality of first holes are provided to form a first row extending in a predetermined direction along the sheet transport direction, A plurality of second holes are provided so as to be adjacent to the first row in the sheet width direction perpendicular to the sheet transport direction and to form a second row extending in the predetermined direction, A third hole is positioned between the first and second rows and is located at the uppermost position in the sheet transport direction, Includes, The aforementioned plurality of first outlet holes are, A plurality of fourth holes are provided, arranged between the first and second rows as viewed from the sheet transport direction, to form a third row extending in the predetermined direction, A plurality of fifth holes are provided adjacent to the third row in the sheet width direction and to form a fourth row extending in the predetermined direction, A plurality of sixth holes are provided, arranged in the sheet width direction opposite to the third row and opposite to the fourth row, to form a fifth row extending in the predetermined direction, Includes, The third hole is located between the fourth and fifth rows when viewed from the sheet transport direction. A drying apparatus characterized by the following features. [Claim 10] A drying apparatus for drying a sheet by blowing hot air onto a sheet on which an image has been formed by ejecting ink, A conveyor belt for transporting the sheets, A first air blowing unit having a plurality of first air outlets that blow air toward a sheet being conveyed by the conveyor belt, and a first duct that guides the air toward the first air outlets, The second blower unit is positioned adjacent to the first blower unit downstream with respect to the sheet conveying direction and has a plurality of second outlets that blow air toward the sheet being conveyed by the conveyor belt, and a second duct that guides the air toward the second outlets. The plurality of first discharge holes include a first hole, a second hole located downstream of the first hole in the sheet conveying direction and having the shortest distance to the first hole in the sheet conveying direction, and a third hole located furthest downstream in the sheet conveying direction, wherein the pitch between the first hole and the second hole in the sheet conveying direction is a first pitch. The plurality of second discharge holes include a fourth hole located at the uppermost position in the sheet transport direction, and the pitch between the third hole and the fourth hole in the sheet transport direction is the second pitch. The second pitch is within ±40% of the first pitch. A drying apparatus characterized by the following features. [Claim 11] The first blower unit is positioned opposite the conveyor belt and has a first surface on which the plurality of first blow holes are formed, The first surface has a first portion whose downstream end in the sheet transport direction is at a first position, and a second portion whose downstream end in the sheet transport direction is at a second position upstream of the first position. The third row is formed in a position that overlaps with the region obtained by projecting the second portion in the sheet transport direction, The fourth row is formed in a position that overlaps with the region obtained by projecting the first portion in the sheet transport direction, The second blower unit is positioned opposite the conveyor belt and has a second surface on which the plurality of second blow holes are formed, The second surface has a third portion whose upstream end in the sheet transport direction is at a third position, and a fourth portion whose upstream end in the sheet transport direction is at a fourth position downstream of the third position. The third hole is formed in a position that overlaps with the region obtained by projecting the third portion in the sheet transport direction. The drying apparatus according to feature 9. [Claim 12] When the hole located furthest downstream in the sheet transport direction among the plurality of fourth holes is designated as the seventh hole, and the hole located furthest downstream in the sheet transport direction among the plurality of fifth holes is designated as the eighth hole, The pitch between the seventh hole and the eighth hole in the sheet transport direction is the first pitch. The pitch between the eighth hole and the third hole in the sheet transport direction is the second pitch. The second pitch is less than or equal to the first pitch. The drying apparatus according to feature 11. [Claim 13] The first row is located between the fourth row and the third row, The second column is located between the fifth column and the third column. The drying apparatus according to feature 9. [Claim 14] Of the plurality of first holes, the hole located furthest upstream in the sheet transport direction is located downstream of the third hole, Of the plurality of second holes, the hole located furthest upstream in the sheet transport direction is located downstream of the third hole. The drying apparatus according to feature 11. [Claim 15] The first portion and the third portion are arranged in overlapping positions when viewed from the sheet width direction, The drying apparatus according to feature 11.

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