Typewriting machines – Sheet or web – Including aligning of sheet edge prior to typing
Patent
1983-10-27
1985-09-24
Burr, Edgar S.
Typewriting machines
Sheet or web
Including aligning of sheet edge prior to typing
271246, B41J 1328
Patent
active
045430039
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to printers, typewriters and like office machines and particularly to a paper alignment device for such a machine.
BACKGROUND ART
In a printer provided with a paper magazine, the magazine is often arranged above the printer. A sheet of paper from the magazine must be conveyed a comparatively long distance before it has reached a position where printing starts in the printer. There is utilized for the conveyance a friction drive means arranged between the magazine and the start-of-print position, and said friction drive means may obtain advancing assistance from a friction drive means arranged in the magazine. Aligning the sheet, i.e. adjusting it so that its side edges run parallel to the advancing direction of the sheet, often takes place in conjunction with the entrance of the sheet into the machine against drive and back-up rolls situated in the upper part of the machine. When the printing start position is considerably further down in the machine, it may occur, in spite of the alignment, that the sheet becomes somewhat askew due to uneven advancing when it has arrived at said position. In order to avoid such skewing of the sheet or at least minimize it, alignment should take place as close to the printing position as possible.
SUMMARY OF THE INVENTION
An object of the invention is thus to obviate the above-mentioned inconveniences and provide a paper sheet feed device, which is situated and implemented such that effective alignment of a sheet of paper in a region adjacent the printing position is achieved with the utilization of simple means.
In order to satisfy the above and further objects of the invention, there is contemplated printing apparatus which comprises a printing head, friction feed means located upstream of said printing head for feeding sheet material to said printing head and therepast to achieve printing on said sheet material in one direction and for feeding sheet material in opposite direction past said printing head with said feed means being halted between reversal of feed direction and alignment means located downstream of said printing head for engaging said sheet material to align said sheet material from the time when it is about to be released from the friction feed means until it has been released and for returning the sheet material into renewed engagement with said friction feed means when the latter has been stopped in preparation for feeding the sheet material in opposite direction.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail in conjunction with two embodiments and with reference to the appended drawings, in which:
FIG. 1 schematically illustrates a paper advancing system extending from a printer and including an aligning device in the form of a fixed stop.
FIGS. 2 and 3 illustrate a modified aligning device in the form of a braking means including a rotatable roll.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The paper advancing system in FIG. 1, includes a friction drive means 10 and a paper chute 11 for guiding a sheet 12 of paper past a printing head 13. The friction drive means comprises a toothed belt 14 running around a drive roller 15 and a tension roller 16. Four backup rolls 17 urge the sheet towards the smooth side of the belt. The rolls 17 are arranged in a holder 18 pivotably mounted on a shaft 19. The paper chute has a vertical extension in the region of the printing head 13, and via a curved portion 11a continues into a horizontal portion bounded by an upper defining wall 20 and a lower defining wall 21. An aligning means in the form of an edge element 22 extends at right angles to the advancing direction of the sheet.
Aligning a sheet of paper is accomplished in the following manner.
The sheet, assumed to come from an unillustrated paper magazine, is fed by driving means incorporated in said magazine into the space between the timing drive belt 14 and the uppermost backup roll 17. Suitably, the sheet is roughly aligned in this position. The drive roll 15
REFERENCES:
patent: 1300235 (1919-04-01), Anderson
patent: 4346880 (1982-08-01), Roller et al.
patent: 4442769 (1982-04-01), Kallin
Burr Edgar S.
Facit Aktiebolag
Pearson Charles A.
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