Typewriting machines – Sheet or web – Including aligning of sheet edge prior to typing
Reexamination Certificate
2001-03-14
2004-10-05
Yan, Ren (Department: 2854)
Typewriting machines
Sheet or web
Including aligning of sheet edge prior to typing
C400S703000
Reexamination Certificate
active
06799915
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image transfer apparatus by which the superimposed sheets in which an image receiving sheet on which an image is formed by a thermal heat-transfer printer, or a laser thermal transfer printer (other than them, any one of printers which can print on the transfer sheet, such as an inkjet printer, may be allowable), and the transfer sheet onto which an image is to be transferred, are superimposed, are passed between the heat roller pair, and an image formed on the image receiving sheet is transferred onto the transfer sheet.
2. Description of the Related Art
When a print plate is made from a color document, and a print of a large number of sheets is conducted, a proof print is conducted and after the finishing is confirmed, then an actual print is conducted. In this case, in a proof print process, a color proof is made and confirmed. Such the color proof is obtained such that, after an image is formed on the image receiving sheet by a thermal printer, an image formed on the image receiving sheet is transferred onto the transfer sheet by an image transfer apparatus.
FIG. 8
shows a conventional general image transfer apparatus. In the same drawing, numeral
1
is an image transfer apparatus, and in this image transfer apparatus, heat rollers
41
and
42
are respectively provided by each one lower and upper being opposed to each other, and on its downstream, nip rollers
51
and
52
are respectively provided upper and lower being opposed to each other. A heat cover
4
covers the periphery of the heat rollers
41
and
42
, and prevents the heat dissipation of the heat rollers
41
and
42
, and a protective transfer cover
5
further covers its outside including the nip rollers
51
and
52
. Further, on the entry side of the image transfer apparatus
1
, an insertion platform
2
is provided, and on the one hand, on its delivery side, a delivery base
3
is provided. The heat rollers
41
and
42
are made of, for example, aluminum material, and its outer peripheral surface is covered by a cover layer formed of lubber, and heaters are internally provided at the center of heat rollers
41
and
42
. In the heat rollers
41
and
42
provided upper and lower being opposed to each other, one (for example, the lower roller) is for driving, and the other roller (the upper roller) is a driven one. The superimposed sheet of the transfer sheet and the image receiving sheet is passed between the upper and lower heat rollers
41
and
42
while being heated and pressed, and the image on the image receiving sheet is transferred onto the transfer sheet, and after that, an image receiving sheet supporting body is peeled from the transfer sheet by the hand, and the image is obtained on the transfer sheet.
FIG. 9
is a view for explaining in detail the shape of heat roller pair
41
and
42
in
FIG. 8
, and the heat roller
41
is a driving roller of a straight type of the roller length of 400 mm (that is, a cylindrical type in which all of the diameters of the both ends of heat roller &phgr;
1
L, &phgr;
1
R and the diameter &phgr;
1
C of the central portion are equal, (for example, 35.8 mm)), and the heat roller
42
is a crown type of driven roller of the roller length of 400 mm (that is, a barrel-shape type in which the diameter &phgr;
2
C of the central portion is a little larger (for example, 36.1 mm) than the diameters &phgr;
2
L, and &phgr;
2
R (for example, 35.8 mm)), and both of heat rollers
41
and
42
are covered by a silicon rubber material of the hardness 60° (JIS hardness A).
Onto both sides of the upper side heat roller
42
, as the pressing force P, the force of 200±40 N is applied per one side.
Because each of heat roller pair
41
and
42
is supported only at 2 portions of both ends, even when the central portion is deflected a little, by the structure of the combination of the straight-crown types as described above, the uniform pressing force can be obtained at any portion of heat roller pair
41
and
42
.
Conventionally, the image transferring is conducted by using such the image transfer apparatus
1
by following 2 methods.
1) One of them is, as shown in
FIG. 10
, a method in which the image receiving sheet R is superimposed on the transfer sheet P, and the superimposed sheet is passed as it is between the heat roller pair
41
and
42
, and the image of the image receiving sheet R is transferred onto the transfer sheet P. That is, in
FIG. 10
, when the superimposed sheet of the transfer sheet P and the image receiving sheet R which is superimposed on the transfer sheet P, is passed between the upper and lower heat rollers
41
and
42
, the superimposed sheet is passed while being heated and pressed, and the image of the image receiving sheet R is transferred onto the transfer sheet P, then, conveyed by the nip rollers
51
and
52
, and delivered from the delivery base
3
.
In this connection, in this case, when the sheets are passed, the image receiving sheet or the transfer sheet is bent, and the convex and concave wrinkle (hereinafter, called an [indent])is generated. It is considered that its cause is due to the difference of the elongation and shrinkage coming from the difference of material between the transfer sheet P and the image receiving sheet R, or the difference of the thermal expansion rate or humidity absorption rate.
2
) In order to solve such the problem, as another method, the present applicant developed a method to use an image transfer apparatus carrier.
FIG. 11
shows a transfer method to use the image transfer apparatus carrier.
In
FIG. 11
, numeral
9
is an image transfer apparatus carrier, and it is structured by a carrier base plate
91
made of a 0.3 mm thick aluminum material, a cover sheet
92
formed of a 0.2 mm thick polyimide material, which covers only the vicinity of the leading edge of the carrier base plate
91
in the advancing direction, and a heat resistive tape
93
to fix the cover sheet
92
to the carrier base plate
91
.
In this connection, when the image transfer apparatus carrier
9
is used, initially, the cover sheet
92
is opened, and the superimposed transfer sheet P
1
and the image receiving sheet R are inserted between the cover sheet
92
and the carrier base plate
91
, and the cover sheet
92
is turned to the original position, and the image receiving sheet and the transfer sheet are nipped from the front and rear surface sides, and the heat resistive tape
93
side is made the leading edge, and the sheets are passed between the heat roller pair
41
and
42
.
In this manner, when the image transfer apparatus carrier is used, the transfer sheet P and the image receiving sheet R are nipped between the carrier base plate
91
and the cover sheet
92
, and are passed between the heat rollers
41
and
42
while being held by the image transfer carrier
9
, thereby, the indent is not generated.
However, the indent is not generated when the image transfer apparatus carrier
9
is used as described above, but, because the heat is absorbed in the aluminum plate, the transmission of the heat becomes undesirable, accordingly, it is necessary that the sheet passing speed is lowered to about {fraction (1/10 )} of the conventional speed, or because it is necessary that the temperature of the heat roller is set higher than the original temperature, the amount of use of the electric power is increased, and it is necessary that the heat resistive temperature of the members is increased, like that the heat resistive structure becomes a large scale. Further, because the image transfer apparatus carrier
9
is ordinary made of an aluminum material, the conveyance path can not be bent, resulting in the hindrance of downsizing of the overall apparatus.
SUMMARY OF THE INVENTION
Accordingly, the present applicant developed previously an image transfer method and an image transfer apparatus thereof in which the image transfer apparatus carrier is not used, and the indent is not generated, and the sheet passing speed i
Fuji Photo Film Co. , Ltd.
Sughrue & Mion, PLLC
Yan Ren
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