Abstract: In a thermal printer with a drawer-type paper holder, a means is provided, which facilitates the loading of recording paper, reduces the number of parts, and improves the precision in positioning a thermal head and a platen roller, a thermal printer is composed of a first frame 1 by which the thermal head 3 is rotatably supported so that recording paper 8 is brought into pressure contact with a platen roller 4 by a biasing member 5 and a second frame 2 that pivotably supports the platen roller 4, is opened and closed in parallel to the first frame 1, and contains a recording rolled paper 8a. The thermal printer has a configuration in which a first cam 3a provided in the thermal head 3 is guided by a second cam 2c formed in the second frame 2 while being biased by the biasing member 5 and thus the platen roller 4 pivotably supported to the second frame 2 is positioned with respect to the thermal head 3.

Abstract: In a thermal printer with a drawer-type paper holder, a means is provided, which facilitates the loading of recording paper, reduces the number of parts, and improves the precision in positioning a thermal head and a platen roller, a thermal printer is composed of a first frame 1 by which the thermal head 3 is rotatably supported so that recording paper 8 is brought into pressure contact with a platen roller 4 by a biasing member 5 and a second frame 2 that pivotably supports the platen roller 4, is opened and closed in parallel to the first frame 1, and contains a recording rolled paper 8a. The thermal printer has a configuration in which a first cam 3a provided in the thermal head 3 is guided by a second cam 2c formed in the second frame 2 while being biased by the biasing member 5 and thus the platen roller 4 pivotably supported to the second frame 2 is positioned with respect to the thermal head 3.

Abstract: A conventional thermal printer has had a structure in which a platen roller cannot be removed from a frame. Therefore, it has been necessary to insert a printing paper between a thermal head and the platen roller. Thus, it has been hard to load the printing paper. In order to solve the problem, there has been devised means for engaging the platen roller with the frame by the biasing force of the thermal head pressing the platen roller to forcibly lift up the platen roller, thereby removing the platen roller. However, there have been problems in that great operating force is required for the removal and the precision in a platen roller support position is low. A frame is provided with a slit (1c) having such a shape as to guide a bearing of a platen roller (2), and the bearing of a platen roller (2) is pushed against the slit by a lock arm using the biasing force of a pressure spring (8) for causing a thermal head (5) to come in press-contact with the platen roller (2).

Abstract: A printer comprises a frame having top, bottom, left and right surfaces, a base disposed along the bottom surface, and a pair of bearings each connected to the base and having a recessed portion. A platen is supported between the left and right surfaces of the frame to undergo rotation. A print head is supported between the left and right surfaces of the frame to undergo pivotal movement about a rotational axis into and out of contact with the platen and for printing on a recording paper fed between the platen and the print head. The print head has a pair of support shafts disposed along the rotational axis each for engagement with one of the recessed portions of the bearings. When the support shafts of the print head detachably engage with the recessed portions of the bearings and the print head is pivoted about the support shafts, the print head undergoes pivotal movement into and out of contact with the platen without being detached from the bearings.