Typewriting machines – Sheet or web – Including sheet guide
Reexamination Certificate
1999-09-21
2001-11-20
Colilla, Daniel J. (Department: 2854)
Typewriting machines
Sheet or web
Including sheet guide
C400S645100
Reexamination Certificate
active
06318919
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pressure device for a printer.
BACKGROUND OF THE INVENTION
In printers of various types such as, for example, serial dot-matrix printers, a printing head acts on a sheet of paper which bears on a platen typically constituted by a roller. The sheet of paper is held tightly against the platen in the vicinity of a printing line by means of a suitable pressure device. This prevents the sheet of paper from vibrating, ensuring good print quality and a low noise level; the pressure device also facilitates the movement of the sheet of paper towards the printing line.
A known pressure device is constituted by a support plate which is anchored to a frame of the printer. A flexible plate is glued to the support plate, generally by means of a two-part adhesive. A free end of the flexible plate, which extends substantially along the entire printing line, is pressed against the platen to keep the sheet of paper fitting tightly.
A disadvantage of these pressure devices is that the method of producing them is quite complex. In particular, the support plate has to be degreased and cleaned with suitable solvents beforehand and then completely dried; moreover, the gluing of the flexible plate requires operations which cannot be automated and which have to be performed manually. The method is therefore extremely slow and expensive and this is reflected in the final cost of the pressure device and hence also of the printer as a whole.
Moreover, the use of glues and solvents makes the method of producing the pressure device highly polluting.
Known pressure devices also have durability problems, since the fairly large forces which act on the flexible plate in a condition of use may cause the flexible plate to be detached from the support plate.
SUMMARY OF THE INVENTION
It is an object of the present invention to overcome the aforementioned drawbacks. To achieve this object, there is proposed a pressure device for a printer comprising a support element which can be fixed to a frame of the printer and a flexible plate fixed to the support element in order to press a printing substrate against a platen in the vicinity of a printing line, in which the support element includes a turned-over portion which is bent onto a remaining portion of the support element in order to restrain a portion of the flexible plate.
The present invention also proposes a printer comprising the pressure device and a corresponding method of producing the pressure device.
REFERENCES:
patent: 869547 (1907-10-01), Buckwell
patent: 5102247 (1992-04-01), Nagoshi et al.
patent: 5186556 (1993-02-01), Koyanagi
patent: 5699815 (1997-12-01), Furukawa
patent: 5823695 (1998-10-01), Bock
Boero Giuseppe
Fiore Rinaldo
Maggi Fiorino
Urso Paolo
Akin Gump Strauss Hauer & Feld L.L.P.
Colilla Daniel J.
Compuprint S.p.A.
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