Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2001-01-31
2002-10-29
Lorengo, Jerry A. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S239000, C156S240000, C156S247000, C156S277000, C156S289000, C156S555000, C427S146000, C427S148000, C430S252000
Reexamination Certificate
active
06471810
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an image transfer device that transfers an image formed on an image receiving sheet on paper by overlapping the image receiving sheet where the image is formed by a thermal transfer printer, a laser thermal transfer printer and others (any printer that can print on transfer paper such as an ink-jet printer) and the paper for the image to be transferred and passing it between a pair of heat rollers.
In case the printing of multiple copies is performed based upon a color manuscript, a printout is acquired after proof print is performed and finishing is verified. At this time, in a proof print process, a color proof is prepared and is verified. Such a color proof is acquired by transferring an image formed on an image receiving sheet on paper by an image transfer device after the image is formed on the image receiving sheet by a thermal printer and others.
FIG. 6
shows a general image transfer device that can be also used in the invention. As shown in
FIG. 6
, a reference number
1
denotes an image transfer device, lower and upper heat rollers
41
and
42
are provided opposite in the image transfer device
1
, and lower and upper nip rollers
51
and
52
are provided opposite downstream. A heat cover
4
covers the periphery of the heat rollers
41
and
42
to prevent the heat dissipation of the heat rollers
41
and
42
and further, a transfer cover
5
for protection including the nip rollers
51
and
52
covers the outside. An insertion table
2
is provided on the side of an entrance of the image transfer device
1
and in the meantime, an ejection table
3
is provided on the side of the ejection.
Each heat roller
41
,
42
is made of aluminum for example, the peripheral surface is coated with a coating layer made of rubber and others and a heater is provided in the center of each heat roller
41
,
42
. Of the lower and upper heat rollers
41
and
42
provided opposite, one (for example, the lower roller) is for driving and the other roller (the upper roller) is driven. Overlapped paper and image receiving sheet are passed between the lower and upper heat rollers
41
and
42
, being heated and pressed, an image on the image receiving sheet is transferred on the paper, afterward, image receiving sheet base material and others are manually peeled from the paper and the image on the paper is acquired.
FIG. 7
is an explanatory drawing for explaining the shape and others of the pair of heat rollers
41
and
42
shown in
FIG. 6
in detail. The heat roller
41
is a driving roller of a straight type having the length of 400 [mm]. That is, each diameter &phgr;
1
L and &phgr;
1
R of both ends of the heat roller and the diameter &phgr;
1
C of the central part are all equal, such as a cylindrical type 35.8 [mm] in diameter for example. The heat roller
42
is a driven roller of a crown type having the length of 400 [mm]. That is, the diameter &phgr;
2
C of the central part is slightly longer than each diameter &phgr;
2
L and &phgr;
2
R, 35.8 [mm] for example, of both ends of the heat roller such as a barrel type 36.1 [mm] in diameter for example. Each heat roller
41
,
42
is coated with silicone rubber 60 degrees in hardness (JIS hardness A).
Also, the force of 200±40 [N] is respectively applied to both ends of the upper heat roller
42
as pressure P.
Even if the center is slightly bent because each heat roller
41
,
42
is supported by only both ends, uniform pressure can be applied to any part of each heat roller
41
,
42
because of the combination of the straight type and the crown type.
Heretofore, an image was transferred by using such an image transfer device
1
by the following two methods.
1. In one method, an image receiving sheet R is overlapped on paper P, the overlapped sheet and paper are passed between the pair of heat rollers
41
and
42
as they are and an image of the image receiving sheet R is transferred on the paper P as shown in FIG.
8
.
That is, as shown in
FIG. 8
, when the overlapped paper P and image receiving sheet R on the paper P are passed between the lower and upper heat rollers
41
and
42
, they are passed, being heated and pressed, an image of the image receiving sheet R is transferred on the paper P, the paper is carried by the nip rollers
51
and
52
and is ejected onto the ejection table
3
.
However, in this case, when the overlapped sheet and paper are passed, they are curved and irregular wrinkles are made. It is conceivable that the wrinkles or windings are made by difference in material between the paper P and the image receiving sheet R in expansion and contraction, in the coefficient of thermal expansion, in the coefficient of moisture absorption between the paper P and the image receiving sheet R.
2. To solve such a problem, this applicant developed a method of using an image transfer device carrier as another method.
FIG. 9
shows a transfer method of using this image transfer device carrier.
As shown in
FIG. 9
, a reference number
9
denotes an image transfer device carrier. The image transfer device carrier includes a carrier board
91
made of aluminum 0.3 [mm] thick, a cover sheet
92
covering only the vicinity of the end in a traveling direction of the carrier board
91
and made of polyimide 0.2 [mm] thick and a heat-resistant tape
93
for fixing the cover sheet
92
to the carrier board
91
.
When the image transfer device carrier
9
is used, the cover sheet
92
is first lifted, overlapped paper P and image receiving sheet R are inserted between the cover sheet
92
and the carrier board
91
. Next, the cover sheet
92
is returned to the original position and the overlapped image receiving sheet and paper are passed between the pair of heat rollers
41
and
42
with the surface and the back of the overlapped image receiving sheet and paper held between the pair of heat rollers and the side of the heat-resistant tape
93
at the head.
As the paper P and the image receiving sheet R are passed between the heat rollers
41
and
42
with the paper and the image receiving sheet held between the carrier board
91
and the cover sheet
92
and in the image transfer device carrier
9
when the image transfer device carrier is used as described above, the problem of windings is solved.
However, though the problem of windings is solved when the image transfer device carrier
9
is used as described above, the transmission of heat is deteriorated because heat is absorbed in the aluminum board, therefore the velocity of passage is required to be slowed up to approximately {fraction (1/10 )} of conventional passage speed or the temperature of the heat roller is required to be set so that it is higher, compared with the proper temperature, used electric power is increased, the heat insulated structure becomes large-scale and the heat-proof temperature of used members is required to be raised.
Also, as the image transfer device carrier
9
is normally made of aluminum, a carriage path cannot be bent and the miniaturization of the whole device is prevented.
Then, this applicant further invented an image transfer method and an image transfer device thereof in which no winding is made and in addition, the quantity of used electric power is normal at normal passage speed respectively without using the image transfer device carrier formerly and applied as U.S. patent application Ser. No. 09/639,161.
Thereby, in an image transfer device that overlaps an image receiving sheet where an image is formed and paper for the image to be transferred, passes them between a pair of heat rollers from an insertion table and transfers the image formed on the image receiving sheet on the paper, the image receiving sheet is first put on the insertion table, and paper overlapped on the image receiving sheet and the image receiving sheet are inserted between the pair of heat rollers.
Referring to
FIG. 2
, the image transfer method according to the background art will be briefly described
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