US 11,867,268 B2
Drive transmission mechanism, image forming apparatus including drive transmission mechanism and assembly method of drive transmission mechanism
Masahiko Mizuno, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Apr. 2, 2021, as Appl. No. 17/221,223.
Claims priority of application No. 2020-067543 (JP), filed on Apr. 3, 2020.
Prior Publication US 2021/0310549 A1, Oct. 7, 2021
Int. Cl. F16H 35/06 (2006.01); G03G 21/16 (2006.01); F16H 57/00 (2012.01); F16H 55/17 (2006.01)
CPC F16H 35/06 (2013.01) [F16H 55/17 (2013.01); F16H 57/00 (2013.01); G03G 21/1647 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A drive transmission mechanism comprising a drive input gear part, an output side coupling, a coil spring, a coupling retracting mechanism and a slide pin, wherein
the drive input gear part includes:
a cylindrical boss formed on a rotational center;
a slide hole formed so as to penetrate the boss;
a protrusion formed on an outer circumferential surface of the boss;
a rim formed concentrically with the boss on an outer side in a radial direction of the boss, and around which gear teeth are formed; and
a web coupling between the boss and the rim,
the drive input gear part being coupled to a drive input side gear,
the output side coupling is formed into a cylindrical shape, has an engagement groove which is formed on an inner circumferential surface and is engageable with the protrusion, has an annular flange part protruding outward formed around an outer circumferential surface of an axial end portion, inserted on an outer circumference of the boss, and rotated together with the drive input gear part around a same rotational axis as the drive input gear part to output a drive force of the drive input gear part to a driven member,
the coil spring biases the output side coupling to a direction separate from the drive input gear part along the rotational axis,
the coupling retracting mechanism retracts the output side coupling inserted on the outer circumference of the boss from a position separate from the web of the drive input gear part closer to the web against biasing force of the coil spring, and
the slide pin is inserted into the slide hole and supports the drive input gear part rotatable as the rotational axis, wherein
when the drive input gear part is disposed at a position where the drive input gear part is capable of being meshed with a gear disposed adjacent to the drive input gear part, the output side coupling is kept at a position separate from the web by the coupling retracting mechanism, and the coil spring is not protruded through an opening edge of the slide hole in a state where the coil spring is not applied with a load, and
when the slide pin is inserted into the slide hole, the coil spring is held between the output side coupling and the slide pin.