US 12,326,677 B2
Drive transmission mechanism, and fixing device and image forming apparatus including the same
Hirotaka Ishida, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Jun. 21, 2024, as Appl. No. 18/750,708.
Claims priority of application No. 2023-105986 (JP), filed on Jun. 28, 2023.
Prior Publication US 2025/0003470 A1, Jan. 2, 2025
Int. Cl. G03G 15/20 (2006.01); F16D 7/00 (2006.01); F16D 7/04 (2006.01); F16H 55/00 (2006.01); F16H 55/17 (2006.01)
CPC G03G 15/2017 (2013.01) [F16D 7/044 (2013.01); F16H 55/17 (2013.01); G03G 15/2064 (2013.01); Y10T 74/19172 (2015.01)] 8 Claims
OG exemplary drawing
 
1. A drive transmission mechanism, comprising:
a first ratchet mechanism that transmits a rotational driving force from a drive source to a first driven member; and
a second ratchet mechanism that transmits a rotational driving force from the drive source to a second driven member,
wherein
the first ratchet mechanism includes
a first drive input gear to which a rotational driving force of the drive source is inputted,
a first drive output gear that is disposed on a same axis as the first drive input gear, and that outputs a rotational driving force of the drive source to the first driven member, and
a first coupling member that is disposed between the first drive input gear and the first drive output gear so as to be capable of performing a thrust movement, and that rotates along with the first drive input gear,
the second ratchet mechanism includes
a second drive input gear to which a rotational driving force of the drive source in inputted,
a second drive output gear that is disposed on a same axis as the second drive input gear, and that outputs a rotational driving force of the drive source to the second driven member, and
a second coupling member that is disposed between the second drive input gear and the second drive output gear so as to be capable of performing a thrust movement, and that rotates along with the second drive input gear,
each of the first coupling member and the second coupling member has a first ratchet tooth that is formed on a surface thereof that faces the first drive output gear or the second drive output gear,
each of the first drive output gear and the second drive output gear has a second ratchet tooth that is formed on a surface thereof that faces the first coupling member or the second coupling member, and that meshes with the first ratchet tooth,
when the drive source rotates in a forward direction,
the first ratchet mechanism rotates in a direction in which drive coupling surfaces of the first ratchet tooth and the second ratchet tooth mesh with each other, and thereby the first ratchet mechanism enters a drive coupling state for transmitting a driving force to the first driven member, and
the second ratchet mechanism rotates in a direction in which non-drive coupling surfaces of the first ratchet tooth and the second ratchet tooth mesh with each other, and thereby the second ratchet mechanism enters a non-drive coupling state for transmitting no driving force to the second driven member,
when the drive source rotates in a reverse direction,
the first ratchet mechanism rotates in a direction in which the non-drive coupling surfaces mesh with each other, and thereby the first ratchet mechanism enters a non-drive coupling state for transmitting no driving force to the first driven member, and
the second ratchet mechanism rotates in a direction in which the drive coupling surfaces mesh with each other, and thereby the second ratchet mechanism enters a drive coupling state for transmitting a driving force to the second driven member,
between the first ratchet mechanism and the second ratchet mechanism, a link member is disposed that assists switching between the drive coupling state and the non-drive coupling state of the first ratchet mechanism and the second ratchet mechanism, and
due to a thrust movement of the first coupling member in a direction separating from the first drive output gear, the link member causes the second coupling member to move in a direction approaching the second drive output gear, and, due to a thrust movement of the second coupling member in a direction separating from the second drive output gear, the link member causes the first coupling member to move in a direction approaching the first drive output gear.