Recorders – Record receivers and/or driving means therefor – Drum
Patent
1982-12-20
1985-05-14
Goldberg, E. A.
Recorders
Record receivers and/or driving means therefor
Drum
1014151, 271277, 355 3DR, 358291, G01D 1528, B41F 2706, B65R 514, G03G 1500
Patent
active
045175756
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to recording paper winding apparatus for winding a recording paper on a rotary drum in an on-demand ink jet recording apparatus or the like.
BACKGROUND OF THE INVENTION
Hitherto, one method of winding a recording paper around a rotary drum is by fastening the front and rear edge of the recording paper by two narrow bars onto the surface of the drum to fix the paper thereto. In this method, however, it is necessary to stretch and tightly contact the paper on the drum surface with very high accuracy.
In order to tightly contact the recording paper on the drum, there are methods of winding the paper around the drum by hand or the like, or by preliminarily fastening the rear end of the paper onto the drum surface by a narrow bar and fixing the paper at a predetermined position by pulling it. Accordingly, since a force is impressed on the drum for winding up the paper on the drum surface, the drum, especially its outer surface, must be strong. Therefore, some reinforcing structure must be added to the drum so that a decreasing of the weight of the drum is limited. This becomes a limitation in attempting to decrease the rotational inertia of the drum or to record at high speed by increasing the drum diameter.
Further, the holding parts of the narrow bar for fastening the end of the recording paper extend beyond the width of the paper at both ends of the drum. Therefore, if the drum rotates at high speed, the narrow bar is subject to centrifugal force so that its function of holding the recording paper is impaired. Accordingly, rotational speed of the drum cannot be very high.
There is still a further method of attaching recording paper to the drum by creating a negative pressure inside the drum. In this method, although there is an advantage in that there is no need of tightly contacting the recording paper on the drum by means of impressing an undesirable force on its outer surface, a complicated operation is necessary in order to maintain an accurate positional relation between the drum and the paper. Furthermore, in the event a shock is imposed on the front edge of the recording paper while recording or the front edge is bent up, then there is the shortcoming that the paper is liable to be peeled off the drum.
BRIEF DESCRIPTION OF THE INVENTION
The present invention provides a recording paper winding apparatus wherein there is provided, on the outer surface of a rotary drum having a negative pressure therein, a bar for pinching and fastening the front edge of the paper between the bar and the drum outer surface. The bar is disposed in a manner to open and close against the drum outer surface, and after the front edge of the paper is pinched by the bar as aforedescribed, the recording paper is wound around the drum, and further, is sucked and held against the drum's outer surface by the negative pressure inside the drum. Thus, the paper is held tightly on the drum even when the latter rotates at high speed so that high speed recording becomes possible.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a rotary drum recording apparatus embodying the present invention.
FIG. 2 is a more detailed perspective view of the rotary drum shown in FIG. 1.
FIG. 3 is an enlarged sectional view taken on line A--A' in FIG. 2.
FIG. 4 is an enlarged fragmentary perspective view of a part of the drum shown in FIG. 3.
FIG. 5 is an enlarged longitudinal sectional view of the rotary drum shown in FIG. 2.
FIG. 6 is an enlarged fragmentary perspective view showing one embodiment of means to open and close the paper-pinching bar shown in FIG. 2.
FIGS. 7-9 are end views taken on line B--B' of FIG. 5 showing operation of the apparatus shown in FIG. 6.
FIGS. 10 and 11 are perspective views showing other embodiments of the rotary drum shown in FIG. 2.
FIG. 12 is a perspective view of a component of the drum shown in FIG. 11.
FIG. 13 is a perspective view corresponding to FIG. 6 showing another embodiment of means to open and close the paper-pinching bar.
FIG.
REFERENCES:
patent: 2767610 (1956-10-01), Hintz et al.
patent: 3093436 (1963-06-01), Merli et al.
patent: 3101234 (1963-08-01), Canamero
patent: 3695757 (1972-10-01), Gregory
patent: 3854715 (1974-12-01), Coleman
patent: 4111119 (1978-09-01), Takizawa et al.
patent: 4225872 (1980-09-01), Marinoff
patent: 4259695 (1981-03-01), Nakano
Kakimoto Atsushi
Takita Masaaki
Goldberg E. A.
Matsushita Electric - Industrial Co., Ltd.
Preston Gerald E.
LandOfFree
Recording paper clamping apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recording paper clamping apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recording paper clamping apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-771229