Sewing machine

A sewing machine comprising:

• a needle plate;
• a feed dog configured to move a workpiece;
• a vertical drive mechanism configured to vertically drive the feed dog;
• a switch mechanism configured to switch from an active state where the feed dog is driven, by the vertical drive mechanism, above and below an upper surface of the needle plate to an inactive state where an upper surface of the feed dog is maintained below the upper surface of the needle plate;
• a cutting mechanism including a blade configured to cut a thread at a position below the needle plate;
• a motor configured to commonly drive the switch mechanism and the cutting mechanism;
• and
• a lower shaft configured to be rotationally driven by a sewing machine motor to drive a shuttle mechanism located below the needle plate,
• wherein the feed dog is configured to be driven frontward and rearward by a rotational drive force of the lower shaft to move the workpiece,
• wherein the switch mechanism is configured to switch between:
• the active state where a transmission path for transmitting the rotational drive force of the lower shaft to the vertical drive mechanism is connected, and the vertical drive mechanism drives, in response to the rotational drive force, the feed dog above and below the needle plate while the feed dog is driven frontward and rearward to move the workpiece;
• and
• the inactive state where the transmission path is disconnected, and the upper surface of the feed dog is maintained below the upper surface of the needle plate,
• wherein the cutting mechanism includes a thread catcher configured to catch and guide a thread at the position below the needle plate, and the blade is configured to cut the thread guided by the thread catcher, and
• wherein the motor is configured to rotate such that:
• while the motor rotates from an initial state in a first direction by a first angle, the transmission path stays connected;
• when the motor is brought into a first state after rotating from the initial state in the first direction by the first angle, the motor drives the switch mechanism to switch the transmission path from connected to disconnected;
• while the motor rotates from the first state to a second state in the first direction by a second angle and then rotates from the second state to the initial state in a second direction opposite to the first direction, the transmission path is maintained disconnected;
• and
• at a point of time during rotation of the motor from the second state to the first state in the second direction by the second angle, the motor drives the cutting mechanism to cut the thread.