A window shade roller cutting assembly comprising:
- a base adapted to be placed on a surface;
- a hollow guiding rod perpendicularly mounted on top of the base and having a fixing plate securely mounted on a side of the guiding rod;
- a measuring rod movable relative to the guiding rod and having equally spaced markings formed on the measuring rod and an amplifier mounted on the measuring rod, wherein a weight is received in the hollow guiding rod to connect to the measuring rod via a connector such that the measuring rod is able to maintain balance with respect to the guiding rod every time the measuring rod is moved;
- a clamping device mounted under the fixing plate and including:
- a brake disk securely connected to a bottom face of the fixing plate and having multiple first springs securely sandwiched between the brake disk and the fixing plate prior to engagement between the fixing plate and the brake plate and a bearing securely received in the brake disk;
- a rotation disk having a centrally formed projection extending through the bearing of the brake disk and the fixing plate to connect to a securing ring such that the brake disk is sandwiched between the rotation disk and the fixing plate, the rotation disk further having bosses each formed on a peripheral edge of the rotation disk;
- a driving disk defined with multiple first arcuate slots adjacent to a peripheral edge of the driving disk to correspond to the bosses of the rotation disk, multiple second arcuate slots each having a first end close to a center of the driving disk and a second end away from the center of the driving disk and multiple extensions formed under the driving disk and being close to the center of the driving disk;
- and
- clamping blocks each having a bar formed to correspond to one of the second arcuate slots of the driving disk and a through hole defined to correspond to one of the extensions of the driving disk such that each of the clamping blocks is able to selectively move from a first position to a second position and vice versa in the second arcuate slots for securing and releasing a workpiece;
- and
- a motor mounted on a side of the guiding rod to drive the driving disk to rotate via a belt;
- and
- a controlling device pivotal in relation to the fixing plate and operatably connected to the motor to activate the motor to rotate, the controlling device having a cutting blade securely mounted on the controlling device so that when the controlling device is pivoted toward the workpiece which is clamped by the clamping blocks, the cutting blade is able to cut the workpiece.