CURL STRAIGHTENING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME
First Claim
1. A curl straightening device that straightens curl of a sheet to be conveyed, the curl straightening device comprising:
- supporting rollers disposed rotatably about shafts extending in a direction orthogonal to a conveying direction of the sheet;
an endless belt that is stretched across the supporting rollers and circulates in the conveying direction;
a curl straightening roller that makes pressure contact with an outer peripheral surface of the endless belt between the supporting rollers so as to form a nip portion and straightens curl of the sheet which passes through the nip portion, the nip portion shaped so that the endless belt curves along a peripheral surface of the curl straightening roller;
a nip width adjusting mechanism that moves the curl straightening roller in a direction away from or close to the endless belt so that a nip width of the nip portion in the conveying direction changes; and
a guide member that guides the sheet to the nip portion, whereinthe nip width adjusting mechanism includesa roller supporting holder that supports the curl straightening roller rotatably, anda rotationally moving portion that rotationally moves the roller supporting holder about a predetermined rotationally moving shaft so that the curl straightening roller moves to the direction away from or close to the endless belt, andthe guide member includes a pair of hanging members, hung at both ends of the curl straightening roller, respectively, in a swingable manner, that keeps the guide member in constant position and posture relative to the curl straightening roller when the rotationally moving portion rotationally moves the roller supporting holder.
1 Assignment
0 Petitions
Accused Products
Abstract
A curl straightening device includes an endless belt, a curl straightening roller, a nip width adjusting mechanism, and a guide member. The curl straightening roller makes pressure contact with an outer peripheral surface of the endless belt, forming a nip portion, and straightens curl of the sheet which passes through the nip portion. The nip width adjusting mechanism moves the curl straightening roller in a direction away from or close to the endless belt so as to change a nip width. The mechanism includes a supporting holder of the curl straightening roller, and a rotationally moving portion that rotationally moves the roller supporting holder for moving the curl straightening roller. The guide member includes a pair of hanging members that are hung from both ends of the curl straightening roller so as to keep the guide member in constant position and posture relative to the curl straightening roller.
2 Citations
6 Claims
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1. A curl straightening device that straightens curl of a sheet to be conveyed, the curl straightening device comprising:
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supporting rollers disposed rotatably about shafts extending in a direction orthogonal to a conveying direction of the sheet; an endless belt that is stretched across the supporting rollers and circulates in the conveying direction; a curl straightening roller that makes pressure contact with an outer peripheral surface of the endless belt between the supporting rollers so as to form a nip portion and straightens curl of the sheet which passes through the nip portion, the nip portion shaped so that the endless belt curves along a peripheral surface of the curl straightening roller; a nip width adjusting mechanism that moves the curl straightening roller in a direction away from or close to the endless belt so that a nip width of the nip portion in the conveying direction changes; and a guide member that guides the sheet to the nip portion, wherein the nip width adjusting mechanism includes a roller supporting holder that supports the curl straightening roller rotatably, and a rotationally moving portion that rotationally moves the roller supporting holder about a predetermined rotationally moving shaft so that the curl straightening roller moves to the direction away from or close to the endless belt, and the guide member includes a pair of hanging members, hung at both ends of the curl straightening roller, respectively, in a swingable manner, that keeps the guide member in constant position and posture relative to the curl straightening roller when the rotationally moving portion rotationally moves the roller supporting holder. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification