Stationary blade support device configured so that stationary blade is not deformed, paper cutting device with stationary blade support device, and printer with paper cutting device

A sheet cutting device, intended for use in a printer, comprising:

• a fixed blade having a center portion, a root portion, a blade edge portion, and a side opposite the blade edge portion, the blade edge portion of the fixed blade having two ends;
• a movable blade configured to cut a sheet of printed paper by moving, in an engagement direction toward the fixed blade, and having a V-shaped blade edge portion;
• and
• a fixed blade support device supporting the fixed blade,
• the fixed blade being curved so that the center portion, in a blade width direction of the fixed blade, protrudes toward the movable blade;
• the fixed blade support device comprising:
• a biasing member configured to bias the fixed blade in a biasing direction toward the movable blade, the biasing direction being straight;
• and
• a support member configured to support the fixed blade by way of the biasing member,
• the support member comprising:
• a base surface portion on which the fixed blade is arranged, by way of the biasing member;
• an upright surface portion that extends from the base surface portion in the biasing direction so as to close a rear side of a root portion of the fixed blade on a side opposite to a blade edge portion thereof, and is configured to prevent the fixed blade from being disengaged in the engagement direction;
• and
• a retainer portion that extends from the upright surface portion so as to cover the center portion of the root portion of the fixed blade in the blade width direction,
• wherein:
• the upright surface portion is devoid of either a blind hole or a through-hole adapted to receive the root portion of the fixed blade;
• and
• the retainer portion is configured to inhibit the fixed blade from disengaging in the biasing direction from the support member while to allow the fixed blade to translate in a direction opposite to the biasing direction and in the blade width direction,
• wherein:
• the sheet cutting device further comprises a spring holder, provided separately from the fixed blade support member, mounted between the base surface portion and the coil spring so as to position the one or more coil springs;
• the spring holder comprises second retainer portions covering the two ends of the blade edge portion of the fixed blade in the blade width direction:
• the second retainer portions are arranged through intermediation of the one or more coil springs;
• and
• the second retainer portions are configured to prevent the fixed blade from being disengaged in the biasing direction.