Thermal printer

A color thermal printer comprising a color printing paper, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, transporting means for selectively transporting the printing paper in opposite directions, a main motor driving said transporting means, and power transmission means for transmitting the drive power of said main motor to said transporting means, said power transmission means including a timing belt tensioned in one of an upper run and lower run thereof and slackened in the other of the upper run and lower run, said timing belt being maintained in a same tensioned state and slackened state immediately before printing each of individual colors on the printing paper is started when said thermal printed is placed in a print mode.

A color thermal printer comprising a color printing paper, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, transporting means including a transport roller for selective transporting of the printing paper in opposite directions, two main motors driving said transporting means, and power transmission means including timing belts for respectively transmitting drive power of said two main motors to said transporting means, wherein two motor-side pulleys each having a one way clutch associated therewith are mounted on a shaft of each of said main motors, and said two main motors rotate in directions opposite to each other so as to drive said transport roller through said two timing belts respectively.

A color thermal printer comprising a color printing paper, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, transporting means including a transport roller for selective transporting of the printing paper in opposite directions, a main motor driving said transporting means, and power transmission means transmitting drive power of said main motor to said transporting means, said power transmission means including two timing belts for driving said transport roller, and wherein two motor-side pulleys each having a one-way clutch associated with a shaft of said main motor are provided, said one way clutches are arranged so as to selectively transmit drive power of said main motor in opposite directions, and said motor-side pulleys respectively drive said transport roller through said two timing belts.

A color thermal printer comprising a color printing paper, a thermal head including an array of heat generating elements for printing an image on the printing paper a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, transporting means including a transport roller for selective transporting the printing paper in opposite directions, and a main motor driving said transporting means, said main motor being selectively rotatable in opposite directions, and said transport roller being directly mounted on a shaft of said main motor to be selectively be rotated in opposite directions by said main motor.

A thermal printer comprising a printing paper supply roll having a printing paper wound therearound in the form of a roll, transporting means for transporting the printing paper supplied from said printing paper supply roll, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, rewinding means for rewinding the printing paper on said printing paper supply roll when the thermal printer is placed in stand-by mode over more than a predetermined period of time, and a heat roller for heating the printing paper.

A thermal printer comprising a printing paper supply roll having a color printing paper wound therearound in the form of a roll, transporting means for transporting the printing paper supplied from said printing paper supply roll, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, rewinding means for rewinding the printing paper on said printing paper supply roll when the thermal printer is place in stand-by mode over more than a predetermined period of time, a heat roller for heating the printing paper, and a power transmission means for transmitting drive power of a motor to said transporting means.

A thermal printer comprising a printing paper supply roll having a color printing paper wound therearound in the form of a roll, transporting means for transporting the printing paper supplied from said printing paper supply roll, a thermal head including an array of heat generating elements for printing an image on the printing paper, a cylindrical platen roller disposed opposite to the heat generating elements of said thermal head, rewinding means for rewinding the printing paper on aid printing paper supply roll when the thermal printer is placed in stand-by mode over more than a predetermined period of time, and power transmitting means for transmitting a drive power of a motor means to the transporting means including belt means for driving a transport roller of said transporting means.