Saddle-stitch and fold machine

A saddle-stitch and fold machine, comprising:

• a conveyer that feeds a plurality of sheets one by one in a feed direction;
• a detector that detects a passage of a front end of the sheet fed from the conveyer so as to send a detect signal;
• a creaser that forms a crease on the sheet fed from the conveyer;
• a saddle-stitcher that stacks the sheets fed from the creaser so as to make a sheet stack, and saddle-stitches the sheet stack along the crease;
• a folder that folds the sheet stack fed from the saddle-stitcher along the crease;
• a controller that controls the creaser, the saddle-stitcher and the folder;
• and
• an input device that receives input from an operator, wherein
• the creaser comprises:
• a crease roller extending in another direction perpendicular to the feed direction, the crease roller provided with a roller surface having a radius and a project part extending beyond the radius in said another direction, and
• a receive part made of an elastic material, the receive part opposed to the crease roller with sheets fed between the crease roller and the receive part, wherein
• the crease roller is rotated between a crease position and a standby position, such that the project part is directed to the receive part to form the crease on the sheet when the sheet is prodded by the project part toward the receive part at the crease position, and such that the roller surface is directed to the receive part not to form the crease on the sheet at the standby position, wherein
• the input device includes a selector, the sheet to be creased by the creaser is selected through the selector by the operator, the input device sends select information on the sheet to be creased toward the controller, and wherein
• the controller controls the creaser based on both the select information from the input device and the detect signal from the detector, wherein
• the sheet is creased by the project part disposed at the crease position when the sheet to be creased is fed from the conveyer toward the creaser;
• and
• the sheet is not creased by the project part disposed at the standby position when the sheet not to be creased is fed from the conveyer toward the creaser.