Paper-length detection device
AssigneeToshiba Tec Kabushiki Kaisha
InventorSho Koike
Life of this patent
Estimating the term…
Abstract
According to an embodiment, a paper-length detection device includes: a moving mechanism and an angle sensor. The moving mechanism supports a magnet. The moving mechanism causes a first regulatory member to move closer to or further from a second regulatory member in accordance with movement of the first regulatory member. The moving mechanism further causes the magnet to rotate in accordance with the movement of the first regulatory member closer to or further from the second regulatory member. The angle sensor faces the magnet and outputs a signal corresponding to an absolute angle with the magnet.
Claims12
A paper-length detection device, comprising:
- a bottom plate, a paper sheet being placed on the bottom plate, the paper sheet having a first edge and a second edge opposed to the first edge;
- a first regulatory member that is provided to be capable of moving relative to the bottom plate in a direction in which the first edge and the second edge face each other, and is in contact with the first edge;
- a second regulatory member that is in contact with the second edge;
- a magnet that rotates while a direction from an S pole and an N pole thereof is parallel to the bottom plate;
- a moving mechanism that
- supports the magnet, and
- causes the magnet to rotate in accordance with movement of the first regulatory member closer to or further from the second regulatory member;
- an angle sensor that faces the magnet and outputs a signal of a voltage value corresponding to a magnetic field that periodically varies in accordance with the rotation of the magnet, the voltage value corresponding to an absolute angle of the magnet, an absolute value of a length of the paper sheet being output based on the absolute angle.
An image forming apparatus, comprising:
- a paper housing device that houses a sheet of paper;
- a printer that forms an image on the paper;
- a conveying device that conveys the paper housed in the paper housing device to the printer;
- a paper-length detection device that detects a length of the paper housed in the paper housing device;
- and
- a first controller that adjusts magnification of image data in accordance with a length of the paper detected by the paper-length detection device and causes the printer to form an image on a basis of the magnification-adjusted image data, wherein
- the paper-length detection device includes
- a bottom plate, a paper sheet being placed on the bottom plate, the paper sheet having a first edge and a second edge opposed to the first edge,
- a first regulatory member that is provided to be capable of moving relative to the bottom plate in a direction in which the first edge and the second edge face each other, and is in contact with the first edge,
- a second regulatory member that is in contact with the second edge,
- a magnet that rotates while a direction from an S pole and an N pole are parallel to the bottom plate,
- a moving mechanism that
- supports the magnet,
- and
- causes the magnet to rotate in accordance with movement of the first regulatory member closer to or further from the second regulatory member, and
- an angle sensor that faces the magnet, and outputs a signal of a voltage value corresponding to a magnetic field that periodically varies in accordance with the rotation of the magnet, the voltage value corresponding to an absolute angle of the magnet, an absolute value of a length of the paper sheet being output based on the absolute angle.
Dependencies are inferred from the claim text.