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US 4,285,606 AGranted
Arrangement for driving a printing head along a printing line
AssigneeIng. C. Olivetti & C., S.p.A.
InventorFelice Giacone
Life of this patent
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AssigneeIng. C. Olivetti & C., S.p.A.
InventorFelice Giacone
Estimating the term…
An arrangement for driving the printing head along a printing line of a recording medium comprises a reversible direct-current electric motor which is coupled to the head for moving the latter forwards and backwards along the printing line. The head prints only during the forwards movement and during this movement the motor is supplied with a first voltage which causes the forwards movement of the head at a first substantially constant velocity. After the printing of a last character the head is moved away from the recording medium by an electromagnet and the motor is supplied with a second voltage which causes the backwards movement of the head at a second substantially constant velocity, greater than the first velocity. During the backwards movement of the head two rollers advance the recording medium and held it tensioned in correspondence with the printing line.
In a printer having a printing head, means defining a rest position for said head, means for advancing said head along a plurality of printing positions of a printing line in front of a recording medium in a forward movement at a substantially constant advancing speed starting from said rest position, and start printing means for causing said printing head to begin printing during said forward movement starting from a first of said printing positions to define a printing stage of said head, the improvement comprising:
A printer comprising a recording medium;
A printer comprising a recording medium, a printing head, means defining a rest position at which said head is located when at rest, a motor coupled to said head for moving said head in front of said medium along a substantially rectilinear path, first feeding means selectively coupled to said motor for causing said head to move at a substantially constant advancing speed in a forward movement starting from said rest position during a printing stage thereof, means for generating a signal indicative of a start of printing position on which a first character can be printed by said head along said rectilinear path, detecting means disposed at a predetermined position, beyond the start of printing position, along said path for detecting the passage of said head, memory means connected to said detecting means for storing whether said head during its forward movement has passed said predetermined position, means for generating a signal indicative of a last character printed along the printing line, second feeding means selectively coupled to said motor and cooperative with said memory means and with said signal for causing said head to move at a substantially constant high return speed of a value higher than said advancing speed in a backward movement thereof toward said rest position when said head during said forward movement has passed said predetermined position, and third feeding means selectively coupled to said motor and cooperative with said memory means and with said signal for causing said head to move at a substantially constant low return speed in a backward movement thereof toward said rest position when said head begins said backward movement from a position intermediate between said rest position and said predetermined position.
In a printer having a printing head movable at a substantially constant advancing speed in a forward movement in front of a recording medium along a printing line starting from a rest position, and means for causing said head to begin printing starting from said rest position the improvement comprising:
Dependencies are inferred from the claim text.