Discharge valve operating device, flush water tank device, and toilet system

A discharge valve operating device configured to perform a valve opening operation of a discharge valve disposed in a flush water tank device configured to supply flush water to a toilet, the discharge valve operating device comprising:

• a first connector and a second connector including respective one ends linked to the discharge valve;
• a rotary winding device to which respective other ends of the first connector and the second connector are linked, the rotary winding device including an outer circumferential surface along which each of the first and second connectors is wound;
• an operation unit including a rotating shaft configured to rotationally operate the rotary winding device, and
• a first protective cover and a second protective cover, each respectively disposed on the first and second connectors, the first and second protective covers each being fixed within the discharge operating device and configured to allow the first and second connectors to slide relative to the respective first and second protective cover,
• wherein when the operation unit rotationally operates in a first direction in a first flushing mode, the operation unit is configured to supply flush water from the flush water tank device to the toilet by a first flush water amount by pulling up the discharge valve by a first length by the rotary winding device which winds the first connector by the first length in the first direction, and
• when in a second flushing mode the operation unit rotationally operates in a second direction opposite to the first direction, the operation unit is configured to supply flush water from the flush water tank device to the toilet by a second flush water amount different from the first flush water amount by pulling up the discharge valve by a second length by the rotary winding device which winds the second connector in the second direction by the second length which is the same as the first length, and
• wherein before toilet flushing in the first and second flushing modes is performed, the first and second connectors are respectively set to be wound in advance by a predetermined length along an outer portion of the rotary winding device.