Typewriting machines – Means auxiliary to typewriting function – Indicator means
Patent
1995-09-20
1996-08-20
Hilten, John S.
Typewriting machines
Means auxiliary to typewriting function
Indicator means
400709, B41J 2944
Patent
active
055472990
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for the exact positioning of a printing head in relation to a recording substrate in a printer.
In a printer, recording substrates in the form of single sheets which consist of paper or plastic are transported in a recording substrate feed shaft. From the recording substrate feed shaft, the recording substrates are fed to a recording substrate holder, on which they are printed.
The recording substrate holder contains means which bring the recording substrate into a desired position on the recording substrate holder. The desired position can, for example, be achieved when one edge of the recording substrate bears on a recording substrate stop which is provided at the edge of the recording substrate holder. If the desired position is fixed in two dimensions, a second recording substrate stop, which is provided at right angles to the first recording substrate stop on a further side boundary of the recording substrate holder, can fix the desired position of the recording substrate in this second position.
Now, if the recording substrate lies with its edges on the recording substrate stops, the printing process can be carried out under the precondition that the position of the recording substrate holder in relation to the printing head and the format of the recording substrate are known.
Normally, printers process recording substrates in a standard format or the format respectively being used must be preselected by am operator. A further possibility of determining the format of the recording substrate consists in guiding a sensor, operating according to the light reflection principle, over the recording substrate holder. In this arrangement, use is made of the different reflection properties of the recording substrate and of the recording substrate holder. Unprinted recording substrates reflect the light much more strongly than the surface of the recording substrate holder. However, problems always arise with this reflection light barrier if a recording substrate has already been printed in part regions before the printing process, that is to say, for example, contains a form which is intended to be filled out by means of the current printing process, or if the reflective capability of the recording substrate differs from common recording substrates, for example because of a particular coloration of its entire surface or of its edges.
The assignment of the recording substrate holder to the printing head is effected by means of a reduction in the geometric tolerances between the printing head mechanism and the recording substrate holder. This tolerance Japanese reference JP 3-197161 discloses a device for positioning a printing head using different reflection properties of a paper, a reflection rail and an end marker. A photosensor and a printing head are arranged together in a moving carrier. on a recording substrate holder and to determine the position of the recording substrate by means of sensors operating according to the reflection principle. The sensors are arranged together with a printing head in a carrier. means of which the lateral deposition of a recording substrate can be determined. On a displaceable carrier, a transmitting and receiving element are arranged opposite each other in such a manner that a recording substrate which is brought into their beam path is detected. 1681-1683, discloses an arrangement for determining the position of a printed sheet. The arrangement operates according to the transmission principle, an LED being provided as transmitting means and a row of photo-transistors as receiving means. The printed sheet is guided between transmitting and receiving means and the position is determined by scanning the phototransistors. The distance between the individual phototransistors is limited to a minimum distance by the size of the components and, for this reason, the position of the printed sheet can be determined only with a relatively coarse resolution, reduction is complicated and expensive.
The present invention is t
REFERENCES:
patent: 4610445 (1986-09-01), Schneider
patent: 4672465 (1987-06-01), Ono
patent: 5346322 (1994-09-01), Okamori
patent: 5397192 (1995-03-01), Khormaee
Dusterhus Richard
Flugge Ruprecht
Petermann Udo
Selke Reimund
Hilten John S.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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