Photocopying – Projection printing and copying cameras – Detailed holder for photosensitive paper
Reexamination Certificate
1996-04-23
2001-04-24
Metjahic, Safet (Department: 2851)
Photocopying
Projection printing and copying cameras
Detailed holder for photosensitive paper
Reexamination Certificate
active
06222616
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method of transferring photosensitive material and apparatus used therefor. More particularly, the present invention relates to a method of transferring strip-form photosensitive material (hereinafter called “paper”) and an apparatus used therefor which can transfer the paper in such a manner to prevent a difference between the predetermined feed size, in particular, when the paper head end portion is sent out only by feed rollers (the size is a print size corresponding to one image which is intermittently sent by a transferring device. If, for example, film has mixed images of varying print sizes, such as full size or panorama size, each adequate predetermined length of the paper, corresponding to the relevant one image, is sent out, and the feed size, when the paper head end portion is transferred after being sandwiched between transferring rollers, and with back tension between the transferring rollers and the feed rollers. The present invention also relates to a method of transferring the paper and apparatus used therefor, which can accurately form a punch hold on the paper for serving as a positioner when the photosensitive material is transferred.
BACKGROUND ART
FIG. 8
shows one example of a photo-processing apparatus. This photo-processing apparatus comprises a printing part
1
for printing images on the paper and a processing part
2
for carrying out treatments, such as development to the printed paper.
In the printing part
1
, there are equipped, along the paper transferring route, a loading part
3
for transferring the paper to the exposure table, an exposure table
4
for exposing and printing the photosensitive paper, an advance part
5
for accurately transferring a predetermined length of the photosensitive paper, a paper transferring part
6
and a stock tank part
7
which can form loops for adjusting the advance of the photosensitive paper to be sent to the processor part
2
, and an outlet part
8
. In the processing part
2
, there are provided a processor rack part
9
in a treatment tank for carrying out color development, bleaching, and fix stabilization; a dryer part
10
in a drying tank for drying the photosensitive paper; and a cutter part
11
in the vicinity of the outlet.
In such photo-processing apparatus, a paper-transferring apparatus is installed for transferring the photosensitive paper, by means of a plurality of rollers, from the process of pulling out a proper amount of photosensitive paper, wrapped and held around a roll magazine (not shown), in a roll form, until the process of finishing the paper into a print, at the processing part
2
are carried out. As shown in
FIG. 1A
, particularly, the photosensitive paper P sent out onto the exposure stand
4
must be transferred exactly by one print size (a predetermined paper feed size) in view of the fact that an image is printed on it. Therefore, in
FIGS. 1A and 1B
, the feed roller
22
mounted on the upstream side of the exposure stand
4
and the transferring roller
23
on the downstream side of the transferring route of paper P are both connected to a pulse motor, and are given precisely same number of revolution so that the feed size can be controlled with back tension giving to the paper.
As shown in
FIG. 1A
, the feed size of the paper P is controlled based on the number of revolution of the feed roller
22
until the head end P
1
of the paper P is sandwiched between transferring rollers
23
, and as shown in
FIG. 1B
, the feed size, after the paper is sandwiched between transferring rollers
23
, is controlled based on the number of revolution of transferring rollers
23
.
Consequently, controlling the number of revolution of both rollers in the same manner gives rise to a problem that the paper is unable to be transferred exactly in the predetermined size if there is any error in the out side diameters of both rollers.
The difference of outside diameter of both rollers is caused not only by processing problems but also by the fact that the outside diameter of the feed roller
22
is intentionally made smaller than that of the transferring roller
23
in order to provide back tension to the paper after it is held between the transferring rollers. In the latter case, in particular, there are rised problems of various inconveniences such as positional discrepancy of the image in the finished print or deviation of the cut size because dimensional deviation becomes remarkable.
There is also a problem of generating waste at the paper head end portion if the paper is exposed after the head end of the paper is held between the transferring rollers.
In addition, there can be assumed a case in which the number of revolution of the feed roller and that of the transferring roller are individually set in advance to feed the predetermined size because of the difference in the outside diameter between the feed roller and the transferring roller. There is, however, a case in which the paper is sandwiched between the transferring rollers before the predetermined size is completely sent out with the feed roller only. In such case, the predetermined size is unable to be sent out unless special countermeasures are taken.
In the above-mentioned paper-transferring apparatus, in general, in order to accurately send the paper to each section stated above, punch holds are drilled near the edge between image frames of the paper, the punch holes are detected at the necessary section by a sensor, and positions of stopping and cutting are determined. Consequently, the accuracy is required for the punch hole position, and back tension is applied to the paper or the paper feed is controlled by a pulse motor to prevent variation of the punch hold position.
However, even if the paper is given back tension or feed-controlled, as described above, there is a problem of inability to improve the positional accuracy of the punch hole as required because the punch hole is drilled with the paper head end not held between the transferring rollers when the paper head end is being exposed. That is, since the paper is sent out to the punch unit by the strength of the paper only, it is difficult to push out and transfer the paper curled by the wrapping in the roll magazine, and, therefore, slack is unavoidably generated in the paper, and it is difficult to accurately arrange the punch hole position. If the paper is transferred and processed in the paper-transferring apparatus with the punch hole deviated, the deviation is generated in the image position in the finished print or defect is generated in the cut size.
Drilling punch holes with the head end held in order to eliminate variation of the punch hole position at the head end generates a great deal of portions in which no punch hole is produced, resulting in loss of the paper.
In addition, in the above-mentioned photo-processing apparatus, in general, a plurality of driving rollers are used and between respective driving rollers, a difference is generated in the roller outside diameters due to processing errors, driving motor control method differs, or roller material is different, thereby generating a difference in the feed rate of each driving roller.
While the apparatus is used over a long time, in each roller, contamination and wear gradually progress. The roller surface becomes slippery due to the contamination and the difference is also generated in the roller outside diameter due to the variation of the degree of wear, and as a result, a difference is generated in the feed rate of each driving roller.
If this error is left as it is, the paper is unable to be transferred in the predetermined sie, and paper slacks or paper pull-out between rollers occurs, causing inconvenience, such as, deteriorated print quality, deviation of cut position or printing position, or paper jamming due to defective transportation.
Consequently, in order to absorb the error of the feed rate of each driving roller, there have been a method of measuring the feed rate per one rotation of each driving roller, comparing the measured
Armstrong, Westerman Hattori, McLeland & Naughton
Chizmar John
Metjahic Safet
Noritsu Koki Co., Ltd.
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