Drive transmission mechanism and recording apparatus including drive transmission mechanism

A drive transmission mechanism for use in a recording apparatus, the drive transmission mechanism comprising:

• a drive source;
• a first transmission member that is rotated by a drive force from the drive source;
• a second transmission member that receives the drive force from the first transmission member so as to be rotated in a first direction and in a second direction opposite to the first direction;
• a third transmission member that receives the drive force from the second transmission member so as to be rotated;
• and
• a support member inserted through a shaft hole of the second transmission member and having an outer peripheral surface, which includes a first region that receives a first pressing force from the second transmission member rotated in the first direction and which includes a second region that receives a second pressing force from the second transmission member rotated in the second direction,
• wherein the support member has a groove disposed on an upstream side of the first region in the first direction and on an upstream side of the second region in the second direction,
• wherein the first region is formed as a result of decentering of the shaft hole in a third direction with respect to the support member due to an action of a resultant force of a force acting from the first transmission member rotated in the first direction on the second transmission member and a force acting from the third transmission member on the second transmission member, and
• wherein the second region is formed as a result of decentering of the shaft hole in a fourth direction reverse to the third direction with respect to the support member due to an action of a resultant force of a force acting from the first transmission member rotated in the second direction on the second transmission member and a force acting from the third transmission member on the second transmission member.