Serial printer having trigger mechanism

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of character positions;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• means for coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means, the type wheel stack means comprising at least two type wheels, each wheel containing a plurality of types;
• and
• type wheel selection means coupled to the type wheel shaft means for selectively shifting the type wheel stack means axially on the type wheel shaft means in response to the rotational position of the type wheel shaft means to position a selected type wheel for printing, the type wheel selection means being carried by the carriage means.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of character positions;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• means for coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means comprising at least two type wheels, each wheel containing a plurality of types, the type wheel stack means mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means;
• type wheel selection means for displacing the type wheel stack means axially on the type wheel shaft means to position a selected type wheel for printing in response to the rotational position of the type wheel shaft means, the type wheel selection means further comprising:
• cam follower means coupled to the type wheel stack means for displacing the type wheel stack means on the type wheel shaft means;
• cam means responsive to rotation of the type wheel shaft means when coupled thereto to move the cam follower means;
• and
• shift clutch means for selectively coupling the cam means to the type wheel shaft means to rotate the cam means for type wheel selection.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of character positions;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• means for coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means comprising at least two type wheels, each wheel containing a plurality of types, the type wheel stack mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means;
• type wheel selection means for displacing the type wheel stack means axially on the type wheel shaft means to position a selected type wheel for printing in response to the rotational position of the type wheel shaft means, the type wheel selection means further comprising:
• shift clutch means responsive to a control signal to selectively couple the type wheel selection means to the type wheel shaft means for the axial displacement of the type wheel stack in response to the rotation of the type wheel shaft means.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of character positions;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• means for coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means comprising at least two type wheels, each wheel containing a plurality of types, the type wheel stack mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means;
• type wheel selection means for displacing the type wheel stack means axially on the type wheel shaft means to position a selected type wheel for printing in response to the rotational position of the type wheel shaft means;
• printer frame means including slide means on which the carriage means is mounted for movement, the carriage means being movable to and from a stand-by position;
• means for selectively coupling the type wheel selection means to the type wheel shaft means to receive rotary power therefrom;
• paper feed drive gear means on the carriage means and coupled to the type wheel selection means for receiving rotary power therefrom;
• paper feed means on the print frame means;
• and
• paper feed transmission gear means coupled to the paper feed means, the paper feed transmission gear means being located at the stand-by position of the carriage means to engage the paper feed drive gear means, whereby when the carriage means is at stand-by position, rotary power from the type wheels selection means is coupled to the paper feed means.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of character positions, the carriage means including a vertical carriage plate;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• type wheel stack means comprising at least two type wheels, the type wheel stack means mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means, the type wheel stack means being disposed on one side of the vertical carriage plate;
• means on the other side of the vertical carriage plate from the type wheel stack means for selectively coupling rotary motion from the motor means to the type wheel shaft means;
• hammer means supported on the carriage plate and extending within the type wheel stack for striking a character;
• hammer driving means at least partially on the other side of the vertical carriage plate for coupling rotation from the motor means to the hammer means and;
• a type wheel selection means for shifting the type wheel stack means axially on the type wheel shaft means to position a selected type wheel for printing, the type wheel selection means being located at least partially on the other side of the vertical plate.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of characters positions;
• type wheel shaft means mounted on the carriage means;
• motor means mounted on the carriage means;
• selection clutch means for coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means comprising at least two type wheels, each wheel containing a plurality of types, the type wheel stack means mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means;
• type wheel selection means for displacing the type wheel stack axially on the type wheel shaft means to position a selected type wheel for printing in response to the rotational position of the type wheel shaft means;
• hammer means supported on the carriage means, the hammer means movable to strike the selected type;
• hammer driving means for moving the hammer means;
• print clutch means for coupling power from the motor means to the hammer driving means;
• selection lever means for causing the selection clutch means to be disengaged to stop coupling rotary motion to the type wheel shaft means;
• and
• actuation lever means for actuating the print clutch means when the selection clutch means has been disengaged.

A print selecting mechanism for use in a serial printer comprising:

• carriage means adapted for movement between a series of characters positions;
• type wheel shaft means rotatably mounted on the carriage means;
• motor means mounted on the carriage means;
• selection clutch means for selectively coupling rotary motion from the motor means to the type wheel shaft means;
• type wheel stack means comprising two type wheels, each type wheel containing a plurality of types;
• the type wheel stack means being mounted on the type wheel shaft means for rotation therewith, the type wheel stack means being axially displaceable along the type wheel shaft means;
• type wheel selection means for displacing the type wheel stack axially on the type wheel shaft means to position a selected type wheel for printing in response to the rotational position of the type wheel shaft means;
• hammer means supported on the carriage means, the hammer means movable to strike the selected type;
• hammer driving means for moving the hammer means;
• print clutch means for coupling power from the motor means to the hammer driving means;
• selection lever means for disengaging the selection clutch means from the type wheel shaft means;
• actuation lever means for actuating the print clutch means when the selection clutch means has been disengaged;
• trigger magnet means rotating with the print wheel shaft means;
• and
• trigger plate means responding to magnetization of the trigger magnet means to actuate the selection lever means and thereafter responding to the demagnetization of the trigger means to enable the actuation of the actuation lever means.