Typewriting machines – Including adjustment for optimum printing plane – Responsive to thickness of record-medium
Patent
1998-09-02
1999-10-05
Burr, Edgar
Typewriting machines
Including adjustment for optimum printing plane
Responsive to thickness of record-medium
400 59, 400630, 400161, 400637, B41J 1120
Patent
active
059612240
DESCRIPTION:
BRIEF SUMMARY
The invention relates to paper transport in printing devices having a movable printing head.
BACKGROUND OF THE INVENTION
In printers for individual sheets or documents, a reference position for the document must be determined; a paper stop that can be pivoted into the printing path being used for this. Furthermore, a gap between the paper transport rollers has to be opened during insertion. This has previously been achieved by a respectively associated and dedicated drive, for example by lifting magnets.
The object of the invention is to provide the said functions without a dedicated drive.
SUMMARY OF THE INVENTION
The invention achieves this object by the printing head moving into a position outside the printing area and in so doing actuating a lever which causes the paper stop to pivot into the paper transport path. Furthermore, the printing head runs onto a stationary mating piece, so that it is pressed away from the printing abutment and a gap is opened, into which the material to be printed can be moved. At the same time, by means of angled levers and push rods, the pairs of paper transport rollers are opened. The arrangement additionally effects adjustment of the printing head gap.
This is therefore an arrangement in which, by moving the printing head of a printing unit to a position outside the printing area, both a paper stop is pivoted into the paper transport path and, as a result of lowering the printing head, a gap is opened both between printing head and printing abutment and between the paper pressure rollers, the coupling of the printing head to the paper pressure rollers in relation to the lowering movement simultaneously enabling adjustment of the printing head gap.
In an embodiment, the present invention provides a printing device for transporting a piece of paper in a transport direction and along a predetermined transport path that defines a plane. The printing device of the present invention comprises a printing head connected to a first lever. The first lever and the printing head are connected to a first stationary bearing for pivotal movement about a first stationary bearing. The first stationary bearing has a first axis that is parallel to the plane of the transport path and perpendicular to the transport direction. The first lever is connected to a guide roller by a second bearing having a second axis that is parallel to the first axis. The first lever is also connected to a third bearing. The third bearing is disposed between the first stationary bearing and second bearing. The third bearing has a third axis that is parallel to the first and second axes whereby movement of the guide roller in a direction perpendicular to the plane of the transport path results in movement of the printing head in the direction perpendicular to the plane transport path but to a lesser degree. The printing head also is mounted on a guide rod that extends perpendicular to the transport path and enables the printing head to be moved or slid along the guide rod in a lateral direction away from the transport path.
In an embodiment, the printing device further comprises a second lever connected to the printing head and to the first, second and third bearings on an opposing side of the printing head and on an opposing side of the transport path.
In an embodiment, the third bearing comprises a guide rod that extends through the printing head.
In an embodiment, the printing head is mounted on the guide rod so that it can rotate about the third axis and the guide rod, which is fixedly connected to the first and second levers.
In an embodiment, the printing head of the invention further comprises a third lever connected to a second guide roller by a fourth bearing having a fourth axis that is parallel to the first axis. The first and second levers are connected by a push rod.
In an embodiment, the printing device of the present invention further comprises a paper stop pivotally connected to the third lever at a fifth bearing. The paper stop also engages a pivoting lever which is mounted to a sixth axis
REFERENCES:
patent: 4563692 (1986-01-01), Negita et al.
patent: 4620807 (1986-11-01), Polit
patent: 5078522 (1992-01-01), Nishizawa et al.
patent: 5172987 (1992-12-01), Stellmach et al.
patent: 5214750 (1993-05-01), Minowa et al.
patent: 5873664 (1999-02-01), Umemo
Baitz Gunter
Malke Wolfgang
Burr Edgar
Ghatt Dave A.
Siemens Nixdorf Informationssysteme A
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