US 6,721,060 B1 · Recording medium cutter image forming device using same

Abstract

A recording medium cutter capable of moving between two positions, a cutting position and a non-cutting position, in a short time, and also capable of cutting a recording medium at accurate positions. A main body (40) rotatably holding a rotary blade (32) and a driven blade (34) is located between side plates (36 and 38) of the cutter (30). A main shaft (39) serving as the center shaft of the rotary blade (32) is rotatably secured to the side plates (36 and 38). The main shaft (39) also serves as the rotating shaft of the main body (40). A driving motor is secured to the mounting plate (42) of the side plate (36). When the main shaft (39) is rotated by the driving motor (44), the rotary blade (32) rotates. Because the driven blade (34) is pressed against the side face of the rotary blade (32), as the rotary blade (32) rotates, the driven blade (34) revolves around the main shaft (39). As a result, the main body (40) also rotates around the main shaft (39). When the main body (40) is moved from the non-cutting position to the cutting position, the rotation of the main body (40) is stopped the moment that a stopper (41) of the main body (40) comes into contact with a stopping plate (50), whereas the rotary blade (32) continues to rotate. When the main body (40) is moved from the cutting position to the non-cutting position, the rotation of the main body (40) is stopped the moment that a lever (58), engaged with the main body during rotation, comes into contact with a hole's extreme end (38) of the side plate (38). At this time, a sensor bar (60) of the lever (58) turns a sensor (62) off, causing the driving motor (44) to be turned off.

Claims15

Dependent claims

A recording medium cutter for use in an image forming device for forming an image on a recording medium moved to an image forming area, said cutter being located downstream of said image forming area in the moving direction of said recording medium, for cutting the recording medium being moved, said recording medium cutter comprising:

a rotary blade for cutting, while rotating, a recording medium in the moving direction thereof;
a driven blade driven by the rotary blade for cutting, while rotating, the recording medium in the moving direction thereof, in cooperation with said rotary blade;
a blade holder rotatable about a center axis of said rotary blade while rotatably holding said rotary blade and said driven blade with a positional relationship between the two blades kept fixed such that the two blades are always in contact with each other;
and
a rotater for pivotally rotating said blade holder between a cutting position where said recording medium is cut and a non-cutting position where said recording medium is not cut.

2 more elements

An image forming device for forming an image on a paper sheet on the basis of image data while moving the paper sheet to an image forming section, said image forming device comprising:

paper sheet side edge detecting means for detecting the position of at least one of two side edges of the paper sheet which are parallel with a paper sheet moving direction;
transverse cutting means for cutting the paper sheet in a direction perpendicular to the paper sheet moving direction;
longitudinal cutting means for cutting the paper sheet in the same direction as the paper sheet moving direction by utilizing power of moving the paper sheet, said longitudinal cutting means being mounted movably in a direction perpendicular to the paper sheet moving direction;
longitudinal cutting control means for moving and setting said longitudinal cutting means at a longitudinal cutting position;
image area detection means for obtaining information about an area of an image based on said image data by checking positions of image points that are most away from the origin of the image respectively in the paper sheet moving direction and in the direction perpendicular to the paper sheet moving direction;
transverse cutting-position deciding means for deciding a transverse cutting position according to image area information obtained by said image area detection means;
and
longitudinal cutting-position deciding means for deciding a longitudinal cutting position according to information about the paper sheet side edge detected by said paper sheet side edge detecting means and said image area information;
wherein said longitudinal cutting control means moves and sets said longitudinal cutting means at a longitudinal cutting position decided by said longitudinal cutting-position deciding means.

6 more elements

Dependencies are inferred from the claim text.

Recording medium cutter image forming device using same

Life of this patent

Recording medium cutter image forming device using same

Life of this patent

Abstract

Claims15