Jam prevention mechanism
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTomoyuki Nishikawa
Life of this patent
Estimating the term…
Abstract
A jam prevention mechanism is provided, adapted to be positioned in a device including a pair of rollers through which a sheet is to be fed, for preventing the sheet from being caught around one of the pair of rollers. The jam prevention mechanism comprises at least one contact member arranged to be located at the downstream side of the pair of rollers along a sheet feeding direction, and contacted with a circumferential surface of one of the pair of rollers by a predetermined force. The contact member is further arranged so as not to be moved along the sheet feeding direction. Thus, the recording sheet can be prevented from being caught around the roller without an excessive resistance applied against the rotation of the roller, and jamming of the recording sheet can be prevented before it happens.
Claims13
A jam prevention mechanism, adapted to be positioned in a device including a pair of rollers through which a sheet is to be fed, for preventing the sheet from being caught around one said pair of rollers, said jam prevention mechanism comprising:
- at least one contact member arranged to be located at the downstream side of said pair of rollers along a sheet feeding direction, in contact with a circumferential surface of one of said pair of roller with a predetermined force, said contact member being elastically deformable in such a fashion that it is movable along the sheet feeding direction;
- and
- stopper means, provided independently of said contact member, for restricting the movement of said contact member along the sheet-feeding direction elastically deformable extent of the said contact member.
A jam prevention mechanism, adapted to be positioned in a printing device, for executing printing operations on a continuous-form recording sheet by an electrophotographic system, including a pair of fixing rollers, including a heat roller adapted to be heated by a heater member and a press roller arranged to be brought into contact and rotated with said heat roller, through which said continuous-form sheet on which unfixed toner is placed is to be fed, for preventing said continuous-form sheet from being caught around one of said pair of fixing rollers, said jam prevention mechanism comprising:
- at least one contact member arranged to be located at the downstream side of said pair of fixing rollers along a feeding direction of said continuous-form sheet and contacted with a circumferential surface of said press roller of said pair of fixing rollers by a predetermined force, said contact member being elastically deformable to be movable along the feeding direction of said continuous-form sheet;
- and
- stopper means, provided independently of said contact member, for restricting movement of said contact member along the sheet feeding direction within an elastically deformable extent of said contact member.
A jam preventing mechanism for use in an electrophotographic printer device, including a pair of fixing rollers for fixing a latent image on a sheet fed through said pair of fixing rollers, comprising:
- prevention means for preventing said sheet from being wrapped around one of said fixing rollers, said prevention means comprising an elastic member contacting an outer surface of one of said fixing rollers with a predetermined force, said elastic member comprising pressing portions that are contacted with said one of said fixing rollers by the elastic force of said elastic member and being movable out of contact with said one of said fixing rollers in the sheet feeding direction.
Dependencies are inferred from the claim text.