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 fixed blade support device, intended for use in a sheet cutting device of a printer, the sheet cutting device having a movable blade and a fixed blade, the sheet cutting device being configured to cut a sheet of printed paper by moving the movable blade in an engagement direction toward the fixed blade, the movable blade including a V-shaped blade edge portion, the 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, the fixed blade being curved so that a center portion in a blade width direction of the fixed blade protrudes toward the movable blade, the fixed blade being supported by said fixed blade support device, and said fixed blade support device comprising:

• a biasing member configured to bias the fixed blade in a biasing direction toward the movable blade;
• and
• a support member, configured to support the fixed blade by way of the biasing member, comprising:
• a base surface portion on which the fixed blade is arranged, by way of the biasing member;
• an upright surface portion extending from the base surface portion, in the biasing direction, so as to close a rear side of the root portion of the fixed blade, on the side opposite to the blade edge portion, and configured to prevent the fixed blade from being disengaged in the engagement direction;
• and
• a retainer portion extending from the upright surface portion so as to cover the center of the root portion of the fixed blade, in the blade width direction, and configured to prevent the fixed blade from being disengaged in the biasing direction;
• wherein:
• the upright surface portion is devoid of a support hole portion adapted to receive the root portion of the fixed blade;
• and
• the support member allows the fixed blade to freely move in the blade width direction and in a direction opposite to the biasing direction.

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;
• 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 being supported by a fixed blade support device;
• the fixed blade support device including:
• a biasing member configured to bias the fixed blade in a biasing direction toward the movable blade;
• and
• a support member, configured to support the fixed blade by way of the biasing member, comprising:
• a base surface portion on which the fixed blade is arranged, by way of the biasing member;
• an upright surface portion extending from the base surface portion, in the biasing direction, so as to close a rear side of the root portion of the fixed blade, on the side opposite to the blade edge portion, and configured to prevent the fixed blade from being disengaged in the engagement direction;
• and
• a retainer portion extending from the upright surface portion so as to cover the center of the root portion of the fixed blade, in the blade width direction, and configured to prevent the fixed blade from being disengaged in the biasing direction;
• wherein:
• the upright surface portion is devoid of a support hole portion adapted to receive the root portion of the fixed blade;
• and
• the support member allows the fixed blade to freely move in the blade width direction and in a direction opposite to the biasing direction.

A printer, comprising:

• a printing mechanism adapted to perform printing on a sheet;
• and
• a sheet cutting device, including:
• 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;
• 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 being supported by a fixed blade support device;
• the fixed blade support device including:
• a biasing member configured to bias the fixed blade in a biasing direction toward the movable blade;
• and
• a support member, configured to support the fixed blade by way of the biasing member, comprising:
• a base surface portion on which the fixed blade is arranged, by way of the biasing member;
• an upright surface portion extending from the base surface portion, in the biasing direction, so as to close a rear side of the root portion of the fixed blade, on the side opposite to the blade edge portion, and configured to prevent the fixed blade from being disengaged in the engagement direction;
• and
• a retainer portion extending from the upright surface portion so as to cover the center of the root portion of the fixed blade, in the blade width direction, and configured to prevent the fixed blade from being disengaged in the biasing direction;
• wherein:
• the upright surface portion is devoid of a support hole portion adapted to receive the root portion of the fixed blade;
• and
• the support member allows the fixed blade to freely move in the blade width direction and in a direction opposite to the biasing direction.