Safety structure for rotary paper trimmer
AssigneeCosimex (H.K.) Limited
InventorKoc-Sing CO
Life of this patent
Estimating the term…
Abstract
A safety structure for rotary paper trimmer comprises a carriage, a cartridge, a blade holder, a locking means, an unlocking means, a biasing means and an actuating means. The blade holder is received inside the cartridge for holding a cutting blade and slides downward to expose a cutting edge of the cutting blade outside the cartridge during cutting operation. By means of the cooperation among the locking means, the unlocking means, the biasing means and the actuating means, the cutting edge is ensured to be concealed completely inside the cartridge when the cartridge is removed from the carriage and when the carriage cover is not pressed by the user, therefore preventing the cutting edge from injuring the user when the rotary paper trimmer is not in use.
Claims8
A safety structure for rotary paper trimmer which comprises
- a carriage for sliding along a rail;
- a cartridge removably received in the carriage;
- a blade holder received inside the cartridge for holding a cutting blade and slides downward to expose a cutting edge of the cutting blade outside the cartridge during cutting operation, and the blade holder has a first side and a second side opposite thereto;
- a locking means disposed inside the cartridge and engaged with the first side of the blade holder and is resiliently biased to block against downward movement of the blade holder;
- an unlocking means comprising an elongated slot provided at the cartridge and a corresponding elongated protrusion provided inside the carriage;
- the elongated protrusion is positioned in such a way that as the cartridge is inserted into the carriage and the elongated slot slides downward along the elongated protrusion, the elongated protrusion comes into contact with the locking means and thereafter disengages the locking means from the blade holder when the cartridge is completely received in the carriage, thereby rendering the locking means no longer blocking against downward movement of the blade holder;
- a biasing means disposed inside the cartridge and engaged with the second side of the blade holder and is resiliently biased to block against downward movement of the blade holder;
- and
- an actuating means provided at the carriage for exerting downward force to the blade holder to overcome biasing force of the biasing means to move the blade holder downward when the cartridge is completely received in the carriage.
Dependencies are inferred from the claim text.