Ink jet recording apparatus

Abstract

To provide an ink jet recording apparatus which can regulate a floating of a sheet which could not be fully suppressed when sucking and conveying the sheet by a conveyor belt.SOLUTION: A floating S1 of a sheet S is regulated by a first regulation part 81 (81a, 81b). In this way, the floating S1 is divided. Floatings S2, S3 after the division are regulated by a second regulation part 82. Namely, when a floating occurs in the sheet S, owing to the regulation of the floating S1 by the first regulation part 81, the floating S1 at one place is divided into the floatings S2, S3 at two places. Then, owing to the regulation of the floatings S2, S3 by the second regulation part 82, the floatings S2, S3 are suppressed to heights where their heights from a conveyance face 3a of a conveyance belt 3 cannot be detected by a floating detection part.SELECTED DRAWING: Figure 8

Claims

1. A recording head that ejects ink to form an image on a sheet, A conveyor belt is positioned opposite the recording head and transports the sheet, A lift detection unit is positioned upstream of the recording head in the sheet transport direction and detects the lifting of the sheet being transported by the transport belt, The system includes a restricting member positioned upstream of the lift detection unit in the aforementioned transport direction, which restricts the lifting of the sheet being transported by the transport belt, The lift detection unit has a detection position located at a predetermined distance from the conveying surface with respect to a first direction perpendicular to the conveying surface of the conveying belt, The aforementioned restraining member is A shaft portion extending in a second direction intersecting the transport direction and the first direction, A plurality of first restricting units are arranged on the shaft portion and face the transport surface at a distance closer than the predetermined distance in the first direction, The shaft portion is provided with a plurality of second restricting units that are arranged on the shaft portion and face the transport surface in the first direction at a distance greater than the first restricting unit and closer than the predetermined distance, The second restricting section is disposed between the first restricting sections adjacent to each other in the second direction. An inkjet recording apparatus characterized by the following features.

2. The first restricting portion has a first through hole through which the shaft portion is inserted, The diameter of the first through-hole is larger than the diameter of the shaft portion. The first regulating unit presses the sheet toward the conveying surface by its own weight, thereby preventing the sheet from lifting up. The inkjet recording apparatus according to feature 1.

3. The second restricting portion has a second through-hole through which the shaft portion is inserted, The diameter of the second through-hole is larger than the diameter of the shaft portion. The second restricting unit presses the sheet toward the conveying surface by its own weight, thereby restricting the sheet from lifting up. The inkjet recording apparatus according to feature 2.

4. The hardness of the first regulating part and the hardness of the second regulating part are less than the hardness of the shaft part. The inkjet recording apparatus according to any one of claims 1 to 3.

5. The shaft portion is made of metal, The inkjet recording apparatus according to feature 4.

6. The first regulating portion and the second regulating portion are formed of resin. The inkjet recording apparatus according to feature 4.

7. The aforementioned floating detection unit is With respect to the second direction, an irradiation unit is positioned on one end of the conveyor belt and irradiates light toward the space through which the sheet conveyed by the conveyor belt passes, With respect to the second direction, it has a light receiving unit positioned on the other end side of the conveyor belt and receiving light emitted from the irradiation unit, The optical path of the light irradiated from the irradiating unit and received by the light receiving unit is set at a position a predetermined distance away from the transport surface with respect to the first direction. The inkjet recording apparatus according to feature 1.

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