Sheet medium conveying device, image forming apparatus, and sheet medium conveying method
A sheet medium conveying device conveys a sheet medium in which position detection marks are provided at regular intervals in a medium conveying direction in which the sheet medium is conveyed. The sheet medium conveying device includes a controller that controls conveyance of the sheet medium. The controller selects one of a first standby position and a second standby position located downstream of the first standby position in the medium conveying direction, and conveys the sheet medium to the selected standby position and puts the sheet medium on standby.
1. A sheet medium conveying device that conveys, in a medium conveying direction, a sheet medium having a position detection mark, the sheet medium conveying device comprising:
a detector that detects the position detection mark of the sheet medium; and
a controller that controls conveyance of the sheet medium,
wherein the controller selects one of a first standby position and a second standby position located downstream of the first standby position in the medium conveying direction on a basis of a detection result obtained by the detector, and conveys the sheet medium to the selected standby position and puts the sheet medium on standby.
2. The sheet medium conveying device of claim 1 , wherein a distance from the first standby position to the second standby position is longer than a length of the position detection mark in the medium conveying direction.
3. The sheet medium conveying device of claim 1 , wherein the detector is a reflective photoelectric sensor.
4. The sheet medium conveying device of claim 1 , wherein
the detector detects the position detection mark when the position detection mark passes through a detection point located upstream of the first standby position in the medium conveying direction.
5. The sheet medium conveying device of claim 4 , wherein
when the detector does not detect the position detection mark before the sheet medium reaches the first standby position, the controller puts the sheet medium on standby at the first standby position, and
when the detector detects the position detection mark before the sheet medium reaches the first standby position, the controller conveys the sheet medium to the second standby position and puts the sheet medium on standby.
6. The sheet medium conveying device of claim 4 , wherein the position detection mark is one of a plurality of position detection marks provided in the sheet medium at regular intervals in the medium conveying direction, and a distance from the detection point to the first standby position is shorter than the intervals in the medium conveying direction between the position detection marks provided in the sheet medium.
7. The sheet medium conveying device of claim 4 , further comprising a cutting unit that is disposed downstream of the detection point of the detector in the medium conveying direction, and cuts the sheet medium,
wherein the controller controls the cutting unit on a basis of a position of the position detection mark detected by the detector.
8. An image forming apparatus comprising:
the sheet medium conveying device of claim 1 ; and
an image forming portion that forms an image on the sheet medium.
9. The image forming apparatus of claim 8 , wherein the image forming portion is disposed downstream of the sheet medium conveying device in the medium conveying direction and forms the image on the sheet medium conveyed by the sheet medium conveying device.
10. The sheet medium conveying device of claim 1 , further comprising a determiner that determines a position of the position detection mark on a basis of detection of the leading edge and the trailing edge by the detector.
11. The sheet medium conveying device of claim 10 , further comprising a cutting unit that is disposed downstream of the detection point of the detector in the medium conveying direction, and cuts the sheet medium on a basis of the position of the position detection mark determined by the determiner.
12. A sheet medium conveying method comprising:
detecting a position detection mark of a sheet medium conveyed in a medium conveying direction;
selecting, by a controller that controls conveyance of the sheet medium, one of a first standby position and a second standby position located downstream of the first standby position in the medium conveying direction on a basis of a detection result obtained by the detector; and
conveying, by the controller, the sheet medium to the selected standby position to put the sheet medium on standby.
13. The sheet medium conveying device of claim 1 , wherein the controller obtains a position of the position detection mark from the detection by the detector.
14. The sheet medium conveying device of claim 1 , wherein the controller controls conveyance of the sheet medium on a basis of detection by the detector.
15. A sheet medium conveying device comprising:
a conveyor that conveys a sheet medium in a medium conveying direction, the sheet medium having a position detection mark having a leading edge and a trailing edge in the medium conveying direction; and
a detector that detects the leading edge and the trailing edge of the position detection mark at a detection point,
wherein the conveyor is configured to
when the detector does not detect the leading edge before the sheet medium reaches a first standby position located downstream of the detection point in the medium conveying direction, put the sheet medium on standby at the first standby position, and
when the detector detects the leading edge before the sheet medium reaches the first standby position, convey the sheet medium at least until the trailing edge passes through the detection point, and put the sheet medium on standby.
16. The sheet medium conveying device of claim 15 , wherein the conveyor is configured to, when the detector detects the leading edge before the sheet medium reaches the first standby position, convey the sheet medium to a second standby position located downstream of the first standby position in the medium conveying direction and put the sheet medium on standby, a distance from the first standby position to the second standby position being longer than a distance from the leading edge to the trailing edge.
17. The sheet medium conveying device of claim 16 , wherein
the sheet medium has a plurality of position detection marks including the position detection mark, the plurality of position detection marks being spaced at regular intervals in the medium conveying direction; and
a distance from the detection point to the second standby position is shorter than the intervals between the plurality of position detection marks.
18. The sheet medium conveying device of claim 15 , wherein the conveyor is configured to
when the detector detects the leading edge but does not detect the trailing edge before the sheet medium reaches the first standby position, convey the sheet medium to a second standby position and put the sheet medium on standby, a distance from the first standby position to the second standby position being longer than a distance from the leading edge to the trailing edge, and
when the detector detects both the leading edge and the trailing edge before the sheet medium reaches the first standby position, put the sheet medium on standby at the first standby position.
19. The sheet medium conveying device of claim 15 , wherein the conveyor is configured to, when the detector detects the leading edge before the sheet medium reaches the first standby position, convey the sheet medium by a predetermined distance after the detector detects the trailing edge, and put the sheet medium on standby.
20. The sheet medium conveying device of claim 15 , wherein the sheet medium has a plurality of position detection marks including the position detection mark, the plurality of position detection marks being spaced at regular intervals in the medium conveying direction.