Fixing device used for image forming device with heating roller and peeler

A fixing device, comprising:

• a frame;
• a heating roller provided to the frame to produce heat, the heating roller having a roller rotation axis and a cylindrical surface;
• a press roller pressed against the cylindrical surface to feed a recording medium together with the heating roller along a feeding path;
• a peeler provided to the frame and having a peeling surface having a leading edge, the leading edge facing the cylindrical surface to peel off the recording medium on the cylindrical surface, the peeling surface facing the feeding path and having a back surface facing the cylindrical surface and opposite to the peeling surface:
• a guide member positioned facing the peeling surface to guide the recording medium which has passed through between the heating roller and the press roller to downstream of the feeding path, the guide member configured to be movable between a near position and a far position during operation of the fixing device, the near position being closer to the peeling surface than the far position;
• a first bias unit that biases the guide member to the near position;
• a rotation member supported to the frame and having a rotation axis and an outer circumference, the rotation axis being parallel to the roller rotation axis, the rotation member being positioned in a manner that a part of the outer circumference protrudes from the peeling surface toward the guiding member and returns to the peeling surface in a virtual plane perpendicular to the rotation axis;
• a removed assistance member configured to contact the back surface to force the peeler away from the cylindrical surface when sufficient force is applied to the peeling surface;
• a rib provided to the frame and protruding from the peeling surface to the guide member in the virtual plane;
• a detection member supported by the guide member on a downstream side with respect to the heating roller in the feeding path, the detection member being displaceable when contacting the recording medium:
• an optical sensor fixed to the frame, and having a light emitting for emitting a light beam and a light receiver for receiving the light beam traveling from the light emitter to the light receiver;
• a blocking member that interlocks with the detection member, the blocking member moving between the light block state an the light passing state in accordance with the displacement of at least one of the detecting member and the guide member:
• and
• a controller that determines whether a jam of the recording medium has occurred based on a movement of the blocking member,
• wherein the rib is positioned on the downstream side with respect to the rotation member in the feeding path;
• and
• wherein the blocking member is in the light blocking state when the guide member is at the near position, and in the light passing state when the guide member is at the far position.

A fixing device, comprising:

• a frame;
• a heating roller having a roller rotation axis and a cylindrical surface;
• a press roller pressed against the cylindrical surface to feed a recording medium together with the heating roller along a feeding path;
• a peeler having a peeling surface having a leading edge, the leading edge facing the cylindrical surface to peel off the recording medium on the cylindrical surface, the peeling surface facing the feeding path, the peeler configured to rotate about an axis, and having a back surface facing the cylindrical surface and opposite to the peeling surface;
• a guide member positioned as facing the peeling surface to guide the recording medium which has passed through between the heating roller and the press roller to downstream of the feeding path, the guide member configured to be moveable between a near position and a far position during operation of the fixing device, the near position being closer to the peeling surface than the far position;
• a guide supporting the peeler axis so as to permit the peeler axis to move away from the guide member during a jam of the recording medium;
• a wheel supported by the frame and having a wheel rotation axis and a circumferential edge, the wheel being positioned in a manner that a part of the circumferential edge protrudes from the peeling surface toward the guiding member and returns to the peeling surface;
• a remove assistance member positioned to contact the opposite surface and engage the back surface during the jam of the recording medium to separate the leading edge from the heating roller;
• a rib provided to the frame and protruding from the peeling surface to the guide member in a virtual plane,
• a detection member supported by the guide member on a downstream side with respect to the heating roller in the feeding path, the detection member being displaceable when contacting the recording medium;
• an optical sensor fixed to the frame, and having a light emitted for emitting a light beam and a light receiver for receiving the light beam traveling from the light emitter to the light receiver;
• a blocking member that interlocks with the detection member, the blocking member moving between the light block state and the light passing state in accordance with the displacement of at least one of the detecting member and the guide member;
• and
• a controller that determines whether a jam of the recording medium has occurred based on a movement of the blocking member,
• wherein the rib is positioned on the downstream side with respect to the wheel in the feeding path;
• and
• wherein the blocking member is in the light blocking state when the guide member is at the near position, and in the light passing state when the guide member is at the far position.