Sheet feeding or delivering – Feeding – By means to convey sheet
Reexamination Certificate
2001-10-04
2003-11-18
Mackey, Patrick (Department: 3651)
Sheet feeding or delivering
Feeding
By means to convey sheet
C271S274000, C400S625000, C400S637200, C400S645400, C400S645500
Reexamination Certificate
active
06648328
ABSTRACT:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a sheet transfer machine useful for supplying sheet such as print sheet to an image forming portion of a printing section in an image forming machine of a printing machine.
A stencil printing machine as an image forming machine is generally provided with an ink supply mechanism at an inner portion thereof. The stencil printing machine includes a printing drum wound with perforated stencil sheet at an outer peripheral face thereof and driven to rotate and a printing section having pressing means for pressing print sheet to the printing drum. Further, the stencil printing machine is provided with a sheet transfer machine as a sheet supply machine and print sheet transferred therefrom is supplied to between the rotating printing drum and the pressing means.
FIG. 6
views a conventional sheet supply machine in a section orthogonal to a sheet supply direction. The sheet supply machine is provided with an upper guide plate
100
and a lower guide plate
101
. The upper guide plate
100
and the lower guide plate
101
are arranged in parallel with each other at an interval therebetween. The upper guide plate
100
and the lower guide plate
101
are formed with hole portions at positions in correspondence with each other. The hole portions are provided with a pair of upper and lower guide roll
102
and timing roll
103
. The two rolls
102
and
103
are constituted in a shape of comb teeth by being divided into pluralities of portions in axial directions.
Print sheet
1
constituting a sheet-like object supplied from the back face side of
FIG. 6
is brought into an interval between the upper guide plate
100
and the lower guide plate
101
. The print sheet
1
is sandwiched by the guide roll
102
and the timing roll
103
and is transferred to this side of FIG.
6
. Although details are not illustrated, at a front side of a transfer direction, there is brought about a state in which the upper guide plate
100
is interrupted and only the lower guide plate
101
is extended to the front side. Further, the print sheet
1
comes out from between the upper and the lower guide plates
100
and
101
and guided along an upper face of the guide plate
101
. At this occasion, as shown in
FIG. 6
, the print sheet
1
is transferred by being sandwiched by the pair of rolls
102
and
103
in the shape of comb teeth and therefore, there is brought about a state in which a swell (portion
1
a
of print sheet
1
formed in a wavy shape) is produced upwardly at a position of a gap between the two rolls
102
and
103
in the axial direction. That is, it seems that since the print sheet
1
is transferred by being sandwiched by the rolls in the shape of comb teeth, pressed states of the sheet differ at a location where the sheet is sandwiched and at other location. Accordingly, such a deformation (
1
a
) in the wavy shape is caused.
When the print sheet
1
is sandwiched by the printing drum and the pressing means in such a state of causing the swell (deformation
1
a
), there arises a problem that the portion of the swell (deformation
1
a
) is crushed to constitute wrinkle.
It is an object of the invention to prevent a swell in a wavy shape from being caused in sheet in transferring the sheet and avoid the problem of causing wrinkle in later steps.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided a sheet transfer machine having a guide plate, a first roll and a second roll and a press member. The second roll sandwiches sheet between the first roll and the second roll and transfers the sheet in a predetermined direction along the guide plate. The press member is arranged on a downstream side in the predetermined direction contiguously to the first and the second rolls for pressing sheet to the guide plate.
According to the first aspect of the sheet transfer machine, the sheet is sandwiched between the first roll and the second roll and is transferred in the predetermined direction along the guide plate. At this occasion, a swell is produced in the sheet. The transferred sheet is pressed on the guide plate by the press member. Thereby, the sheet produced with the swell can be brought into a flat state and transferred.
According to a second aspect of the invention, there is provided a sheet transfer machine provided at an image forming machine having an image forming drum driven to rotate and pressing means for forming an image on sheet by pressing the sheet to the image forming drum. The sheet transfer machine supplies the sheet to between the image forming drum and the pressing means. The sheet transfer machine is provided with a guide plate for guiding the sheet, a first roll, a second roll for sandwiching the sheet between the first roll and the second roll and transferring the sheet in a predetermined direction along the guide plate and a press member arranged on a downstream side of the predetermined direction contiguously to the first and the second rolls for pressing the sheet to the guide plate.
According to the second aspect of the sheet transfer machine, the sheet is sandwiched between the first roll and the second roll and guided to the guide plate. The sheet is transferred in the predetermined direction along the guide plate. At this occasion, a swell is produced in the sheet. The transferred sheet is pressed above the guide plate by the pressing members. The sheet produced with the swell is flattened and is supplied between the image forming drum and the pressing means. The sheet is pressed to the image forming drum driven to rotate by the pressing means. At this occasion, the swell is not produced in the sheet and therefore, even when the sheet is sandwiched between the pressing means and the image forming drum, wrinkle is not produced. Further, since image is formed on the sheet which is not produced with wrinkle and therefore, excellent image which is not warped can be formed.
According to a third aspect of the invention, there is provided a sheet transfer machine provided at an image forming machine including an image forming drum driven to rotate and pressing means for pressing sheet to the image forming drum and printing the sheet. The sheet transfer machine supplies the sheet between the image forming drum and the pressing means. The sheet supply machine is provided with guiding means, an upper roll, a lower roll and press members. The guiding means comprises an upper guide plate and a lower guide plate arranged at a predetermined interval therebetween. Hole portions are respectively formed at positions of the upper guide plate and the lower guide plate in correspondence with each other. The upper roll is arranged on an upper side of the upper guide plate proximately to the hole portions of the upper guide plate. The lower roll is arranged on a lower side of the lower guide plate proximately to the hole portions of the lower guide plate. The upper roll and the lower roll sandwich the sheet inserted between the upper guide plate and the lower guide plate therebetween. The upper roll and the lower roll transfer the sheet in a predetermined direction along the guiding means. The press members are arranged on a downstream side of the upper roll in the predetermined direction. The press members press the sheet transferred and coming out from between the upper guide plate and the lower guide plate to an upper face of the lower guide plate.
According to the third aspect of the sheet transfer machine, the sheet is inserted between the upper guide plate and the lower guide plate. The inserted sheet is sandwiched between the upper roll and the lower roll and is transferred in the predetermined direction along the guiding means. A swell (deformation) is produced in the sheet coming out from between the upper guide plate and the lower guide plate. The sheet produced with the swell is pressed by the press member at the upper face of the lower guide plate. Thereby, the sheet produced with the swell is flattened and is supplied between the image forming drum an
Kanesaka & Takeuchi
Mackey Patrick
Riso Kagaku Corporation
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