JPS63108738U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a carriage of a thermal printer and a mechanism mounted thereon, which is an embodiment of the present invention. FIG. 2 is a perspective view showing the external appearance of an electronic typewriter including the thermal printer. FIG. 3 is a perspective view of the head drive mechanism shown in FIG. 1 taken out and showing its released state, and FIG. 4 is a perspective view showing its pressed state. FIG. 5 is a front view showing the outline of the head driving cam in FIG. 1, FIG. 6 is a front view showing the outline of the blade driving cam, and FIG. 7 is a front view showing the combined state of both cams. It is a diagram.
FIG. 8 is a perspective view of the origin detection mechanism of these cams, and FIG. 9 is a sectional view of the ribbon winding unit in FIG. 1. FIG. 10 is a plan sectional view showing the ribbon winding configuration of the ribbon cassette in relation to a thermal head and the like. 2: Thermal printer (thermal printing device),
10: Carriage, 14: Platen, 16: Printer frame, 20: Print paper, 22: Thermal head, 26: Ink ribbon, 30: Head drive unit, 32: Ribbon winding unit, 34: Unit frame, 36: Head lever ( head holding member), 38: collection lever, 46: head pressing spring (biasing means), 48: cam lever (
cam follower), 58: head drive cam, 66:
Gear drive shaft, 74: Head drive motor, 80, 9
0: First cam surface, 82, 92: Second cam surface, 84
, 94: Third cam surface, 96: Head return spring, 9
8: Collection blade (ribbon holding part), 1
00: Blade pressure spring, 104: Blade return spring, 108: Blade drive cam, 110: First cam surface, 112: Second cam surface, 114: Third cam surface, 116: Missing tooth portion, 118: Leaf spring, 128:
Stopper, 134: Unit mounting surface (assembly part),
136, 138: Positioning surface (assembly part), 146
: Spool drive cam (ribbon winding body), 148:
Ribbon take-up spool, 150: camshaft (rotation drive member), 162: slip gear (rotation drive member)
, 166, 168: felt (rotation drive member),
174: Gear support arm, 176: First gear (rotation drive member), 178: Second gear (rotation drive member), 180: Rack, 192: Assembly shaft (assembly part)
, 194: Boss part (assembly part), 199: Long hole (assembly part).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A thermal printing device that performs a printing operation via a thermal ribbon while moving a thermal head relatively along a printing line of printing paper, which holds a thermal head and the thermal head is A head holding member that supports the head in a movable manner between a printing position in which it contacts the printing paper via a thermal ribbon and a release position in which it separates from the printing paper, and the head holding member is moved between the printing position and the release position. a ribbon winding body that is engaged with a take-up spool that winds the thermal ribbon; and a rotational drive member that rotates the ribbon winding body. A thermal printing device comprising: a take-up unit; and a carriage formed with an assembly portion for assembling the head drive unit and the ribbon take-up unit, respectively. (2) The thermal printing device according to claim 1, wherein the head drive unit includes biasing means for biasing the head holding member in a predetermined rotational direction. (3) The thermal printing device according to claim 1 or 2, wherein the carriage is made of resin and the head drive unit is made of metal. (4) The thermal printing device according to any one of claims 1 to 3, wherein the ribbon winding unit includes a large number of members stacked on one axis.