Typewriting machines – Including type-set-assemblage mounted on carrier and... – Type-head – per se
Reexamination Certificate
1999-10-26
2001-09-04
Hilten, John S. (Department: 2854)
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Type-head, per se
C400S175000, C400S320000, C400S322000, C347S008000
Reexamination Certificate
active
06283651
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an arrangement for mounting a print head in a printer, and more particularly to an arrangement utilising a magnet for holding the print head. The invention enables the elimination of cumbersome mounting and dismounting of the print head. The arrangement according to the invention also allows for the print head pressure point to be transversely displaced. The arrangement shows the property of being self-adjusting, regarding the alignment of the print head and the pressure distribution, in relation to a print roll.
STATE OF THE ART
Today, screws are mainly used for mounting the print head into a printer. As it is important to maintain the print head parallel to the print roll, and to obtain an even pressure along the entire printing area, the position of the print head must be accurately adjusted. For this purpose, e.g. adjustment screws are used. When exchanging the print head, or after cleaning, the print head must be readjusted in order to obtain an appropriate printing quality. It is also possible for the print head to be dislodged if the printer is handled carelessly, e.g. if the printer has to be moved. In the previous technology, there is also no possibility of displacing the pressure point to adapt the pressure distribution of the printer to various paper widths.
The present invention solves the above problem by mounting the print head by means of a magnet. Due to this, no screws have to be loosened in order to remove the print head. The magnet is also easily transversely displaced, so as to adapt the print head pressure point to the paper width. The magnet has such a design that the print head has a certain liberty of pivoting around the pressure point. Guides see to that the print head will be automatically aligned parallel to the print roll and that the pressure is evenly distributed for optimum printing quality.
SUMMARY OF THE INVENTION
The present invention thus provides an arrangement for mounting a print head in a printer, comprising a frame to which a feeder device and a printing mechanism are fitted. The feeder device feeds a material to be printed on which the printer will print by means of a print head, movably arranged adjacent to a print roll for being brought into, or out of, contact with the material to be printed. According to the invention the print head is movably held by a magnetic device.
Preferably, the print head is fitted to a fixture device, which is pivoting freely around a rear axle parallel to the print roll, and pressure is applied on the print head by a pressure member. The magnetic device is preferably attached to the pressure member so as to transfer pushing as well as pulling forces.
The invention is defined by claim
1
. Advantageous embodiments of the invention are defined in the dependent claims.
REFERENCES:
patent: 4239402 (1980-12-01), Jung et al.
patent: 4381896 (1983-05-01), Shiurila
patent: 4682188 (1987-07-01), Castellano
patent: 4708502 (1987-11-01), Murakami
patent: 5146849 (1992-09-01), Johenning, II
patent: 0174817 (1986-03-01), None
patent: 1291946 (1989-11-01), None
patent: 0580330 (1994-01-01), None
Chau Minh
Hilten John S.
Intermec IP Corp
Orum & Roth
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