Abstract: A size positioning device applied to a window covering cutting apparatus includes a manual operating member, a limit assembly and a position detecting device. The limit assembly can be driven by the manual operating member to move. The position detecting device can detect a position of the limit assembly and generate a position detecting value. According to the position detecting value, a signal processing circuit of the window covering cutting apparatus generates adjusted position information and target position information, and displays the adjusted position information on an output device. The manual operating member is adjusted according to the adjusted position information to move the limit assembly until the adjusted position information equals to the target position information, after which a cutting device cuts a first end of the window covering. Thereby, a risk of cutting the window covering to a wrong size due to miscalculation by users is reduced.

Abstract: A window covering cutting apparatus includes a supporting base, a mounting base, a cutting device, a size positioning device, an input device, an output device, a storage device and a signal processing circuit. The signal processing circuit calculates acquired information including product information, a mounting mode, cutting size information and a position detecting value to generate adjusted position information and target position information, and displays them on the output device. The size positioning device is adjusted until the adjusted position information equals to the target position information, after which the signal processing circuit sets the cutting device to cut the window covering to the required size. Since a correct cutting position of the window covering is obtained by the calculation of the signal processing circuit, a risk of cutting the window covering to a wrong size due to miscalculation by users is reduced.