Patent classifications
G03G2215/00168
Belt conveyor unit and image forming apparatus
An inclined flange roller is located outward of an end portion of a tension roller in the belt width direction. The inclined flange roller includes a flange surface capable of being in contact with the edge portion of a belt in a region in which the belt is wound around the tension roller and a roller surface capable of being in contact with an inner peripheral surface of the belt between the flange surface and an end portion of the tension roller in the belt width direction.
IMAGE FORMING APPARATUS
An image forming apparatus includes an image forming portion, an endless belt and a plurality of stretching rollers. The stretching rollers includes a tiltable steering roller, a sliding member, a first stretching roller having a smallest diameter, and a second stretching roller having a largest diameter of the diameters. With respect to rotational axis directions of the stretching rollers, lengths of contact portions of the stretching rollers with the belt are shorter than a width of the belt, the length of the contact portion of the first stretching roller with the belt is a first length, the length of the contact portion of the second stretching roller with the belt is a second length shorter than the first length, and end positions of the contact portions of the first and second stretching rollers with respect to the rotational axis direction are different from each other.
BELT DEVICE, BELT CONTROL DEVICE, AND IMAGE FORMING APPARATUS INCLUDING SAME
A belt control device includes a holder to movably support a rotation shaft of at least one of the plurality of rotators around which a belt is looped, a contact part to contact an end of the belt as the belt moves in a belt width direction, a stationary frame part disposed facing the holder, a shaft moving device to move the rotation shaft as the belt moves, and at least one projection disposed on one of the stationary frame part and the holder. The projection is to contact the other of the stationary frame part and the holder. The projection includes a long projection having a contact portion extending in a shaft moving direction in which the rotation shaft moves, and the contact portion is contactable with the other of the stationary frame part and the holder.
Drive for belt
A belt driving device includes: an endless belt; a stretch roller to engage the endless belt, the stretch roller including a rotary shaft; a steering roller spaced apart from the stretch roller within the endless belt; an adjustment member located along the rotary shaft of the stretch roller, the adjustment member movable along the rotary shaft; and linking mechanism to couple the adjustment member to the steering roller, the linking mechanism to engage a contact surface of the adjustment member. The contact surface includes contact points positioned at different distances from the rotary shaft to raise the linking mechanism during movement of the adjustment member, to cause the steering roller to tilt at an angle, and to maintain an alignment of the endless belt.
DRIVE FOR BELT
A belt driving device includes: an endless belt; a stretch roller to engage the endless belt, the stretch roller including a rotary shaft; a steering roller spaced apart from the stretch roller within the endless belt; an adjustment member located along the rotary shaft of the stretch roller, the adjustment member movable along the rotary shaft; and linking mechanism to couple the adjustment member to the steering roller, the linking mechanism to engage a contact surface of the adjustment member. The contact surface includes contact points positioned at different distances from the rotary shaft to raise the linking mechanism during movement of the adjustment member, to cause the steering roller to tilt at an angle, and to maintain an alignment of the endless belt.
Belt control device and image forming apparatus incorporating same
A belt control device includes a plurality of rollers, a belt wound around the plurality of rollers and configured to rotate along with the plurality of rollers, a belt contact member that the belt contacts when the belt moves in an axial direction of the plurality of rollers, and a shaft displacement member movable in the axial direction and including an inclined face inclined with respect to a surface of the belt to control movement of the belt in the axial direction. The belt, the belt contact member, and the shaft displacement member are configured to make a frictional force between an edge of the belt and the belt contact member greater than a frictional force between the belt contact member and the shaft displacement member.
BELT CONTROL DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME
A belt control device includes a plurality of rollers, a belt wound around the plurality of rollers and configured to rotate along with the plurality of rollers, a belt contact member that the belt contacts when the belt moves in an axial direction of the plurality of rollers, and a shaft displacement member movable in the axial direction and including an inclined face inclined with respect to a surface of the belt to control movement of the belt in the axial direction. The belt, the belt contact member, and the shaft displacement member are configured to make a frictional force between an edge of the belt and the belt contact member greater than a frictional force between the belt contact member and the shaft displacement member.
Image forming apparatus
An image forming apparatus includes an image forming portion, an endless belt and a plurality of stretching rollers. The stretching rollers includes a tiltable steering roller, a sliding member, a first stretching roller having a smallest diameter, and a second stretching roller having a largest diameter of the diameters. With respect to rotational axis directions of the stretching rollers, lengths of contact portions of the stretching rollers with the belt are shorter than a width of the belt, the length of the contact portion of the first stretching roller with the belt is a first length, the length of the contact portion of the second stretching roller with the belt is a second length shorter than the first length, and end positions of the contact portions of the first and second stretching rollers with respect to the rotational axis direction are different from each other.
Belt device, belt control device, and image forming apparatus including same
A belt control device includes a holder to movably support a rotation shaft of at least one of the plurality of rotators around which a belt is looped, a contact part to contact an end of the belt as the belt moves in a belt width direction, a stationary frame part disposed facing the holder, a shaft moving device to move the rotation shaft as the belt moves, and at least one projection disposed on one of the stationary frame part and the holder. The projection is to contact the other of the stationary frame part and the holder. The projection includes a long projection having a contact portion extending in a shaft moving direction in which the rotation shaft moves, and the contact portion is contactable with the other of the stationary frame part and the holder.
Position detection apparatus that detects position of target object
A position detection apparatus detects a position of a target object. One end of a swinging member contacts the target object, and the other end contacts a moving member. (M+1) pieces of sensors are arranged to output signals corresponding to a position of the moving member. Measured parts are disposed on the moving member along loci of measuring positions of the sensors. A detection unit detects the position of the target object based on the output signals of M pieces of sensors when the other sensor outputs a predetermined signal. The measured parts corresponding to the other sensor are provided in 2.sup.M pieces of divided areas that are disposed along a locus corresponding to the other sensor. Each of the measured parts corresponding to the other sensor is disposed in a center portion except both ends in the moving direction in each of the divided areas.