Cutting – Tool engages work during dwell of intermittent workfeed – With work-moving clamp jaw
Reexamination Certificate
2001-03-05
2003-02-18
Shoap, Allan N. (Department: 3724)
Cutting
Tool engages work during dwell of intermittent workfeed
With work-moving clamp jaw
C083S213000, C083S255000, C083S277000, C083S452000, C083S646000, C083S934000
Reexamination Certificate
active
06520058
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a three-side trimmer used for book binding process or the like.
BACKGROUND OF THE INVENTION
A three-side trimmer for cutting (or trimming) the three sides, i.e., the top edge, the bottom edge and the front edge of a bound material is often used for finishing book binding in book binding process. The three-side trimmer is comprised of, as schematically shown in
FIG. 7
, a top edge trimming cutter
1
for cutting the top edge of a bound material to be trimmed (not shown), a bottom edge trimming cutter
2
for cutting the bottom edge of the bound material, a front edge trimming cutter
3
for cutting the front edge of the bound material, a cutting table
4
on which the bound material is supported and a pressing plate
5
pressing and fixing the bound material while cutting the bound material.
The trimming cutters
1
,
2
and
3
are arranged substantially in a U-shaped manner above the cutting table
4
along the upper surface peripheral edge of the table
4
. The top edge trimming cutter
1
and the bottom edge trimming cutter
2
are arranged to face each other in parallel with each other, with a distance corresponding to the distance between the top and bottom of the bound material from each other. The front edge trimming cutter
3
is arranged at right angle with respect to the top edge trimming cutter
1
and the bottom edge trimming cutter
2
. Each of the trimming cutters
1
,
2
and
3
is attached to a frame (not shown) for upward and downward movement in oblique direction by a drive. Each of the trimming cutters
1
,
2
and
3
executes upward and downward movement between a wait position at which it is located above the upper surface peripheral edge of the cutting table
4
and a cutting position at which it is press-contacted with the upper surface peripheral edge of the cutting table
4
.
Elongate blade receiving plates
4
a
,
4
b
and
4
c
made of, for example, hard rubber and receiving the corresponding trimming cutters are fixed in peripheral regions in such a manner that- they are press-contacted by the trimming cutters
1
,
2
and
3
located at the cutting positions on the upper surface of the cutting table
4
. Further, a pressing plate
5
is detachably attached to a tool which is ascended and descended by an elevator or the like, which is not shown.
During a cutting operation, the bound material is put on the upper surface of the cutting table
4
and the top edge, bottom edge and front edge thereof are positioned on the upper surfaces of the corresponding blade receiving plates
4
a
,
4
b
and
4
c
, respectively. Then the bound material is pressed by the pressing plate
5
and fixed to the cutting table
4
. Thereafter, the top edge trimming cutter
1
and the bottom edge trimming cutter
2
are simultaneously descended from the wait positions to the cutting positions, the top edge and bottom edge of the bound material are cut and the top edge trimming cutter
1
and the bottom edge trimming cutter
2
are ascended to the wait positions. Then, the front edge trimming cutter
3
is descended from the wait position to the cutting position and the front edge of the bound material is cut. After the cutting operation, the front edge trimming cutter
3
is ascended to the wait position. Alternatively, after the bound material is fixed to the cutting table
4
by the pressing plate
5
, the front edge trimming cutter
3
may move upwardly and downwardly so as to first cut the front edge of the bound material and then the top edge trimming cutter
1
and the bottom edge trimming cutter
2
may be simultaneously moved upwardly and downwardly to cut the top edge and bottom edge of the bound material.
In case of the conventional three-side trimmer, if the size of the bound material is changed, the distance between the top edge trimming cutter
1
and the bottom edge trimming cutter
2
needs to be changed. To do so, the top edge trimming cutter
1
and the bottom edge trimming cutter
2
are normally moved to be close to or away from each other in a direction parallel to the length of the front edge trimming cutter
3
, thereby making the distance changeable. If the distance between the top edge trimming cutter
1
and the bottom edge trimming cutter
2
is changed, it is necessary to change the positions of the blade receiving plates
4
a
and
4
b
fixed to the cutting table
4
. Due to this, cutting tables having sizes corresponding to the sizes of bound materials are prepared and appropriately replaced. However, the cutting table
4
is located just under the respective trimming cutters, so that a cutting table replacement operation is quite dangerous. Considering this, according to an improved three-side trimmer, a blade receiving plate
4
c
relating to a front edge trimming cutter
3
is fixed to a base, a cutting table
4
is constituted out of a pair of plate elements which can execute movement in approaching or separating directions parallel to the length of the blade receiving plate
4
c
, and a blade receiving plate
4
a
relating to a top edge trimming cutter
1
and a blade receiving plate
4
b
relating to a bottom edge trimming cutter
2
are fixed to the paired plate elements, respectively. By doing so, it is possible to change the positions of the blade receiving plates
4
a
and
4
b
without replacing the cutting table.
In the above-stated three-side trimmer, a bound material is located at a fixed position on the paired plate elements, at which position the three edges, i.e., the top edge, bottom edge and front edge of the bound material are cut. As a result, the front edge trimming. cutter
3
mechanically interferes with the top edge trimming cutter
1
and the bottom edge trimming cutter
2
if the blade
3
operates simultaneously with the top edge trimming cutter
1
and the bottom edge trimming cutter
2
. To avoid this interference, the upward and downward movement of the front edge trimming cutter
3
is conducted at a predetermined time after the upward and downward movement of the top edge trimming cutter
1
and the bottom edge trimming cutter
2
.
Nevertheless, because of the wear and the like of the constituent elements of the three-side trimmer, the staggered timing of the upward and downward movement of the front edge trimming cutter
3
with respect to the top edge trimming cutter
1
and the bottom edge trimming cutter
2
is shifted,.with the result that the front edge trimming cutter
3
interferes with the top edge trimming cutter
1
and the bottom edge trimming cutter
2
and the three-side trimmer is disadvantageously broken. Further, if the size of the bound material is changed, it is necessary to replace the pressing plate
5
in accordance.with the changed size. The replacement operation for the pressing plate
5
is, however, carried out in a narrow region surrounded by the respective trimming cutters
1
,
2
and
3
. Due to this, the operation is required to be carried out with the greatest possible care and is disadvantageously difficult to pursue.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a three-side trimmer capable of preventing the mechanical interference of a front edge trimming cutter with a top edge trimming cutter and a bottom edge trimming cutter during operation and capable of dealing with different sizes of bound materials without the need to replace a pressing plate.
According to the present invention, the above object is attained by providing a three-side trimmer comprising: a frame; a cutting table supporting a bound material to be trimmed thereon; a top edge trimming cutter attached to the frame for upward and downward movement, and cutting a top edge of the bound material; a bottom edge trimming cutter attached to the frame for upward and downward movement and in parallel with the top edge trimming cutter, and cutting a bottom edge of the bound material; a front edge trimming cutter attached to the frame for upward and downward movement at right angle with respect to the top edge trimming cu
Nakajima Akira
Takeuchi Toyoki
Yachi Tomonori
Choi Stephen
Hodgson & Russ LLP
Horizon International Inc.
Shoap Allan N.
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