Abstract: A sheet conveying apparatus includes a rotating member to covey a sheet and a drive transmission having a first, gear in a first engaging portion, a second gear in a second engaging portion, and an urging member. In a state where the first engaging portion and the second engaging portion are engaged with each other and the first gear is rotating in a first direction, a first surface of the first engaging portion transmits a driving force of a driving source from the first gear to the second gear. The first surface is inclined so that either engaging portion can retract, in the direction against the urging force of the urging member, to disengage with the other engaging portion while the first engaging portion rotates. A direction of twist of helical teeth in the first gear is configured to generate an axial force with respect to the urging direction.

Abstract: A pretensioner for introducing a webbing wound in a spool by explosive power obtained by exploding gunpowder when an impact is applied from the outside, the pretensioner includes: a hollow cylinder having one side surface for inserting a portion of a pinion connected to the spool; a micro gas generator (MGG) mounted in an upper end portion of the cylinder and for transferring explosive power into the cylinder while gunpowder provided at the inside explodes when an impact is applied from the outside; a rack mounted in a length direction at the inside of the cylinder and having one end portion disposed toward the MGG and having the other end portion disposed opposite to the pinion and having gear teeth provided in one side surface separated not to engage with the pinion before receiving explosive power from the MGG; and a roller for receiving explosive power from the MGG and rotatably mounted at the other side surface opposite to one side surface of the cylinder in which a portion of the pinion is inserted so t

Abstract: A power transmission device and an image forming apparatus having the same that is capable of reliably transmitting intermittent power to a driven component from a driving source. The power transmission device includes a shaft, a first intermittent gear to receive power from the driving source and to rotate on the shaft, a second intermittent gear arranged so as to move between a first position in which the second intermittent gear is connected to the first intermittent gear along an axial direction of the shaft and a second position in which the second intermittent gear is disconnected from the first intermittent gear, a sliding unit arranged so as to slide along the shaft and to move the second intermittent gear in the axial direction of the shaft, and a driving unit to drive the sliding unit.