Patent ID: 6996451

Claim:
A control device of a sewing machine driven by a sewing machine motor to execute a sewing operation using a needle thread and a bobbin thread, the control device comprising: a bobbin thread remaining amount detection unit that detects a bobbin thread remaining amount; a stopping unit that stops the sewing machine motor when a scarcity of a remaining amount of the bobbin thread is detected by the bobbin thread remaining amount detecting unit; a sewing restarting unit that restarts the sewing operation after stopping the sewing machine motor by the stopping unit; a permitted sewing amount setting unit that sets a permitted sewing amount after stopping the sewing machine motor by the stopping unit; an actual sewing amount calculation unit that calculates an actual sewing amount after stopping the sewing machine motor by the stopping unit; and an informing unit that informs when the actual sewing amount calculated by the actual sewing amount calculation unit reaches the permitted sewing amount.