Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1996-08-01
1998-05-05
Burr, Edgar S.
Typewriting machines
Typing by other than type-face or type-die
Thermal
40012016, 347197, 347222, B41J 232
Patent
active
057465207
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a printer with a platen and a printhead. More particularly, the present invention relates to a printer having a structure for supporting a printhead.
BACKGROUND ART
FIG. 7 shows an example of a conventional printer. The printer includes a platen 101 which is rotatably provided to bridge along the width direction of a recording medium (not shown). The printer also has a printhead 102 which is disposed at the back of the platen 101. Further, the printer includes a pressing body 103 to press a front surface of the printhead 102 from the rear thereof into contact with the platen 101. The pressing body 103 has a vertical shaft 104 and a horizontal shaft 105. A torsion spring 106 is wound on the horizontal shaft 105 to generate a pressing force. The vertical shaft 104 pierces the printhead 102 to rotatably support the printhead 102.
FIGS. 8A and 8B show another example of a conventional printer. FIG. 8A represents a printhead 201 and FIG. 8(B) represents a frame 202. As shown in the figure, the frame 202 has left and right side walls 203 and 204 which are disposed facing each other at a distance depending on the width of a recording medium (not shown). The printhead 201 is incorporated between the left and right side walls 203 and 204. In this example, protrusions 205 and 206 are formed at both ends of the lower portion of the printhead 201, respectively. Through holes 207 and 208 are formed in the protrusions 205 and 206, respectively. On the other side, in the lower portions of the left and right side walls 203 and 204, through holes 209 and 210 are formed, respectively. In a state where the printhead 201 is incorporated in the frame 202, the above-mentioned through holes 207, 208, 209, and 210 are aligned. By inserting a shaft (not shown) in the through holes, the printhead 201 can be provided to bridge rotatably with respect to the frame 202.
FIGS. 9A and 9B show still another example of a conventional printer. A pair of upper and lower pins 302 and 303 are formed at the left end in the width direction of the printhead 301. In the same manner, a pair of upper and lower pins 304 and 305 are formed at the right end in the width direction of the printhead 301. On the other hand, the frame 306 has left and right side walls 307 and 308 which are disposed facing each other at a distance depending on the width of a recording medium (not shown). A guide slit 309 is formed in the left side wall 307. The guide slit 309 branches into a vertical branch portion 310 and an arc-like branch portion 311. In the same manner, a guide slit 312 is formed in the right side wall 308. The guide slit 312 branches into a vertical branch portion 313 and an arc-like branch portion 314. The above-mentioned printhead 301 is incorporated in the frame 306 dropwise from above. In an assembled state, the upper pin 302 is engaged with the arc-like branch portion 311 while the lower pin 303 is engaged with the vertical branch portion 310. In the same manner, the upper pin 304 is engaged with the arc-like branch portion 314 while the lower pin 305 is engaged with the vertical branch portion 313. In this state, the printhead 301 rotates backward and forward with the lower pins 303 and 305 being the center of the rotation. Here, the upper pins 302 and 304 are guided by the arc-like branch portions 311 and 314, respectively.
In the conventional printer shown in FIG. 7, the printhead 102 is axially supported by the vertical shaft 104 of the pressing body 103 so that the printhead 102 can tilt right and left. Therefore, when the front surface of the printhead 102 is pressed from the rear thereof into contact with the platen 101 by the action of the torsion spring 106, the printhead 102 can tilt and move right and left to absorb the deviation. However, since the horizontal shaft 105 connected with the vertical shaft 104 is fixedly supported with respect to the frame, the printhead 102 cannot move backward and forward directions when pressed into contact with the platen 101. Since the extent
REFERENCES:
patent: 4235555 (1980-11-01), Aprato
patent: 4844632 (1989-07-01), Minowa
patent: 5071266 (1991-12-01), Harada et al.
patent: 5156467 (1992-10-01), Kithara et al.
patent: 5181787 (1993-01-01), Hosomi
Burr Edgar S.
Grohusky Leslie
Seiko Instruments Inc.
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