Typewriting machines – Sheet or web – For feeding web record-medium
Patent
1994-07-20
1996-10-01
Yan, Ren
Typewriting machines
Sheet or web
For feeding web record-medium
B41J 1170
Patent
active
055607250
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a device for feeding a rolled strip of printing substrate to a laser printer and for delivering the strip in a predetermined format.
BACKGROUND OF THE INVENTION
It is well known that the laser type printers for professional use normally available on the market do not accept a continuous strip of printing substrate. Only very high-quality laser type printers accept the feeding of a continuous strip of substrate under certain conditions.
A printer of this type is described in document DE-A-4025177, for example. In practice, the printer described in this document accepts the continuous feeding of a paper referred to as detachable feed pin paper which comprises lateral perforations on both sides of the sheet and transversal perforations of a specific length making it possible to later separate the strip into conventional pages. This document describes the detection of the transversal perforations making it possible to determine the point where the strip must stop in the course of each successive printout.
Document DE-A-3313404 also describes the continuous feeding of a laser type printer and is more specifically concerned with a device making it possible to slacken the strip of substrate at the printer input. It therefor does not describe a solution for feeding a laser type printer not designed for this purpose with a continuous rolled strip of printing substrate and for delivering the strip in a predetermined format.
Document U.S. Pat. No. 4,478,143 describes a special matrix printer making it possible to have the paper input and output on the same side, with a continuous feeding of the paper. The problem encountered with a laser type printer is quite peculiar since such a printer does not accept all substrate formats, contrarily to a matrix printer.
OBJECT OF THE INVENTION
The objective of the present invention is thus to provide a device making it possible to use a conventional laser type printer to print on a substrate of a specific format which under normal conditions is not accepted by the printer.
SUMMARY OF THE INVENTION
According to the invention, the feed and delivery device comprises a means of input and a means of output respectively placed at the input and at the output of the printer, and each comprising a means of guillotining and cutting the strip and a means of measuring the length of said strip between two successive cuts.
According to one embodiment, the measuring means consists of a guide of which one face easily receives the strip, with this face having a determined length and/or a means of detecting the strip, such as a photoelectric cell or a microswitch.
According to another embodiment, the measuring means consists of a phonic wheel driven to rotation by the strip or by a transcoder.
Preferably, the means of input is placed below the printer, a guide being provided to guide the paper towards the printer input, whereas the means of output is placed above the printer, with a tray for receiving the cut substrate available beyond the means of output.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention and its other objectives, advantages and characteristics will be more clearly understood upon reading the description which follows of the preferred embodiments (provided on a non limiting basis), in connection with the accompanying drawings, in which:
FIG. 1 is a cross-sectional drawing of the feed and delivery device according to the present invention, associated to a laser type printer not designed for this purpose;
FIG. 2 is a drawing of a preferred measuring means which can be used with the device shown in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to FIG. 1 in particular, the printer 10 is shown without details since it is a conventional printer of the type available on the market.
In brief, the continuous strip 5 is formed into a roll 3 and first enters a guide 7 from which it penetrates a means of input 12 at the output of which a guide 42 is provided to guide the strip towards the input 22 of th
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By J. Bateson et al., "Dual-Motor Forms Feed Drive", IBM Technical Disclosure Bulletin, Dec. 1979, vol. 22, No. 7, pp. 2616 and 2617.
M.G.I.
Yan Ren
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