Typewriting machines – Means auxiliary to typewriting function – Frame – casing – or support for typewriter
Patent
1992-05-06
1993-08-24
Eickholt, Eugene H.
Typewriting machines
Means auxiliary to typewriting function
Frame, casing, or support for typewriter
3122083, B41J 2902
Patent
active
052383172
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a printer having a freely accessible printer frame and more particularly to a printer having a housing base, a housing top, a holding device disposed in the housing base, and a printer frame being pivotally mounted on the holding device wherein the housing top includes a housing flap being pivotally mounted on the housing base so that the housing top can support the printer frame when it is pivoted away from the housing base.
To provide an easily serviceable and maintainable printer, for example an ink jet printer, both the printer frame and flat electronic modules of the printer should be installed in a printer housing, for example made of plastic, in a manner which makes assembly and service as easy as possible. A flat electronic module is understood to mean a printed circuit board or card used for power supply and for printer function control. This flat electronic module is normally disposed in the printer frame and has electronic components assembled on it. In the following, a "printer frame" refers to a seat and support frame for mechanical and electrical modules of the printer. The mechanical and electrical modules include, for example, a printer carriage, a platen, a gear mechanism, a stepper motor, etc.
One possible way of installing the printer frame is to insert it into a trough-shaped housing base via rubber buffers. However, when this installation is used, the circuit boards, which are preferably attached at the bottom of the printer frame, are not easily accessible for assembly, service and inspection.
Another possible way of installing the printer frame is known from the Siemens overview description for a teletypewriter 1000 S dated October 1979 (the disclosure of which is incorporated herein by reference). In this overview description, the teletypewriter is shown in a service position on page 3-1. A printer frame pivoted away from the housing base, supported by a support element, is characteristic for the service position. Because the printer frame is pivoted away, a circuit board located on the housing base, with electronic components assembled on it, is easily accessible for assembly and maintenance work.
Further printers of the stated type are known from U.S. Pat. No. 4,531,852 and DE-GM 81 06 810.
The present invention provides a printer which is easy to assemble and to service, both for a printer frame and for circuit boards.
SUMMARY OF THE INVENTION
The printer of the present invention is made easy to assemble and to service by providing the printer with a housing base, a housing top, a holding device disposed in the housing base, and a printer frame being pivotally mounted on the holding device, wherein the housing top includes a housing flap being pivotally mounted on the housing base so that the housing top can support the printer frame when the frame is pivoted away from the housing base. The printer frame includes circuit boards which are freely accessible when the printer frame is pivoted away from the housing base. These circuit boards are pivotally arranged on the printer frame by a releasably attached hinged joint. Bearing journals, each surrounded by a rubber sleeve, each rubber sleeve preferably having a radially projecting crown, are provided at the pivoting point of the printer frame and the holding device. The printer frame is thereby isolated from any jolts in the housing base or housing top.
The printer frame is freely accessible from all sides for assembly, service, and inspection due to its pivotal mounting to the printer housing. A holding device provided for pivotal mounting is preferably arranged in a trough-shaped housing base, due to the weight of the printer frame (which can be, for example approximately 7 kg). A support is provided for the freely pivoting part of the printer frame. This support is also preferably arranged in the trough-shaped housing base.
A housing flap of the printer housing, preferably also pivotally mounted, is used as a rest so that the pivotally mounted printed frame does no
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"Six Point Hinge Mechanism" IBM Technical Disclosure Bulletin, vol. 28, No. 6, Nov. 1985 pp. 2476-2477.
"Combined Cover Support & Interlock Switch", IBM Tech. Discl. Bulletin, vol. 27, No. 1B, Jun. 1984, pp. 565*14 566.
Bohmer Georg
Irro Otmar
Eickholt Eugene H.
Siemens Aktiengesellschaft
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