Mechanism for correcting unbalance of a rotor
AssigneeFuji Photo Film Co., Ltd.
InventorTakashi Fukui
Life of this patent
Estimating the term…
Abstract
A mechanism for correcting unbalance of a rotor that is caused at positions at which at least one of a leading edge chuck and a trailing edge chuck that hold a sheet member disposed on a peripheral surface of the rotor varying in accordance with the sheet size. The unbalance is corrected by disposing, at a predetermined distance from a rotary shaft, an anchor having a fixed weight. In a state where the unbalance is corrected, a main balancer is purposely attached to the rotor to cause an unbalanced state. According to the position at which the trailing edge chuck attaches to the peripheral surface of the rotor, a second arm is moved by mechanical interlocking to maintain an angle θ2 with respect to a chuck holder. Consequently, unbalance is adjusted in accordance with the size of the sheet.
Claims18
A rotor, disposed with an unbalance correcting mechanism and around which a sheet member is wound and fixed, comprising:
- (a) a rotor body, including an axis of rotation and a peripheral surface for supporting the sheet member;
- (b) a chuck device for pressing a leading edge and a trailing edge of the sheet member against the peripheral surface of the rotor body, the chuck device including a first chuck and a second chuck and having a first mode, in which the first chuck is attached to the rotor body and the second chuck is apart from the rotor body, and a second mode, in which both the first and second chucks are attached to the rotor body;
- (c) a main balancer attached to the rotor body and having a first relative positional relation with the first chuck;
- (d) a sub-balancer attached to the rotor body and having a second relative positional relation with the second chuck in the second and
- (e) a chuck holder swingable around the axis of rotation, with the second chuck being attachable to the rotor body via the chuck holder;
- wherein the main balancer and the sub-balancer increase unbalance of the rotor in the first mode and reduce unbalance of the rotor in the second mode.
An apparatus for forming an image on a printing plate, comprising:
- (I) a drum around which a printing plate is taken up and fixed, the drum including
- (a) a drum body, including an axis of rotation and a peripheral surface for supporting the printing plate,
- (b) a chuck device for pressing a leading edge and a trailing edge of the printing plate against the peripheral surface of the drum body, the chuck device including a first chuck and a second chuck and having a first mode, in which the first chuck is attached to the drum body and the second chuck is apart from the drum body, and a second mode, in which both the first and second chucks are attached to the drum body,
- (c) a main balancer attached to the drum body and having a first relative positional relation with the first chuck,
- (d) a sub-balancer attached to the drum body and having a second relative positional relation with the second chuck in the second mode, and
- (e) a chuck holder swingable around the axis of rotation, with the second chuck being attachable to the drum body via the chuck holder,
- wherein the main balancer and the sub-balancer increase unbalance of the rotor in the first mode and reduce unbalance of the rotor in the second mode;
- (II) a section for feeding the printing plate to the drum;
- (III) a section for rotating the drum;
- (IV) a section for recording an image onto the printing plate wound around the periphery of the drum body;
- and
- (V) a section for detaching the printing plate from the drum.
Dependencies are inferred from the claim text.