Typewriting machines – Sheet or web – For feeding web record-medium
Patent
1983-05-31
1985-02-26
Burr, Edgar S.
Typewriting machines
Sheet or web
For feeding web record-medium
400635, 4006161, 271275, 226 76, 226171, B41J 1132
Patent
active
045015104
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a feed mechanism for webs in the form of continuous sheets of paper for a printer or typewriter.
BACKGROUND
Normally, printers and typewriters are designed for printing on sheets of paper, usually of the format A4, said sheets being placed in the machine so as to present either the short or the long edge in the direction of feed. The machines are equipped with friction drive means including rollers or belts which co-operate with a platen or with idle rollers of a different kind for the feeding of a sheet of paper. Such machines are also used with continuous forms which have rows of holes along their side edges in the direction of feed and in which engage pin wheels provided for the driving of the said forms. Most often the pin wheel drive means are included in a separate unit connected to the machine, preferably in a way involving the inactivation of the friction drive means. The pin wheel drive means may include a separate drive motor or may be connected to the drive motor for the friction drive means.
The need for a separate unit when using continuous forms with existing printers and typewriters constitutes an obvious drawback.
SUMMARY OF THE INVENTION
A primary object of the invention is to remedy the drawback indicated and to provide a feed mechanism for paper sheets or continuous webs or forms, the use of which in a printer or a typewriter permits the use of paper sheets or continuous forms without the need for any supplemental device.
The object is achieved in a feed mechanism having friction feed means driven from a drive source for feeding the sheets or webs and means provided with projections releasably connected to the friction drive means for drive thereby to feed the web via holes therein in combination with the feed by the friction drive means.
In further accordance with the invention, the feed pressure of the friction drive means is reduced when feeding the web.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a paper feed mechanism according to the invention and intended to be included in a printer, not shown.
FIG. 1a is a detail view of parts of FIG. 1.
FIG. 2 is an exploded view of a feeding unit included in the feed mechanism of FIG. 1.
FIG. 3 is a section taken along line A--A in FIG. 1 wherein certain parts have been excluded and wherein a tractor cover with idle rollers has been shown in two different positions corresponding to friction feeding of paper sheets and pin wheel feeding of continuous forms, respectively.
FIG. 4 is a section as in FIG. 3, however showing the tractor cover with the idle rollers in a continuous-form loading position.
DETAILED DESCRIPTION
In the embodiment shown a paper feed unit built up on a frame comprising an elongate frame portion 10 forming the bottom and back parts of the frame and two end walls 11, 12 secured to the frame portion 10 by means of screws 13, 14, 15. Two feed units 16, 17 for frictional feeding of paper sheets are journalled on shafts 18, 19 along which the units can be displaced to be set for different sheet widths.
FIG. 2 shows the structure of a friction feed unit. The unit comprises a casing 20 covered by a cover 21 which is secured to the casing by screws 22. Holes 23, 24 in the cover co-operate in pairs with holes 23, 24 in the casing to journal two gears 25, 26 which are supported on the shafts 18 and 19, respectively, in the frame. The gears have cogs 27 which mesh with a cog belt 28 interconnecting the two gears 25, 26 and transmitting movement from the gear 26 to the gear 25. The casing 20 has an opening 29 which exposes the smooth outer surface of the cog belt 28. The smooth surface is intended to be pressed against a sheet of paper, not shown, by idle rollers 30, see FIG. 3. The idle rollers are arranged in tractor covers 31 of which one is provided for each feed unit. In the cover 31, four rollers 30 in pairs are journalled on arms 32 which in tur
REFERENCES:
patent: 830480 (1906-09-01), Kavle
patent: 2131152 (1938-09-01), Stickney
patent: 2280095 (1942-04-01), Metzner
patent: 2426333 (1947-08-01), Antrim et al.
patent: 3421612 (1969-01-01), Pitt
patent: 3747820 (1973-07-01), Hawxhurst
patent: 4368994 (1983-01-01), Sweeney
Burr Edgar S.
Facit Aktiebolag
Pearson Charles A.
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