Cutting – Processes – With preparatory or simultaneous ancillary treatment of work
Reexamination Certificate
2002-10-15
2004-11-02
Ashley, Boyer D. (Department: 3724)
Cutting
Processes
With preparatory or simultaneous ancillary treatment of work
C083S176000, C083S454000, C083S456000, C083S934000, C083S277000
Reexamination Certificate
active
06810778
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to printed materials and more particularly to clamping devices and trimming units for trimming edges of a book.
U.S. Pat. No. 6,030,163 discloses a method for fusing two or more pieces along an edge to produce a volume. The volume can have a skewed spine.
U.S. Pat. No. 5,086,681 discloses transferring books using an infeed conveyor system having a belt. The belt travels at slower speed than conveyor chains to create a slight frictional force on pusher members attached to the conveyor chains. As the books leave the infeed conveyor system, they are impelled into a first trimming station.
BRIEF SUMMARY OF THE INVENTION
A problem associated with prior art trimmers used for trimming books is the delamination of the cover of a book from the interior sheet material. This trim defect is typically called “chipout”.
FIGS. 1 and 2
show a force vector analysis by the present inventors, in which the forces of a straight trim blade at an angle alpha are analyzed as a trimming blade
10
with a straight edge
12
cuts an end of a book
20
. Book
20
includes sheet material
26
and a cover
22
, connected to sheet material
26
by adhesive
24
.
A resultant force FR normal to the blade edge
12
results, with a force component F
1
parallel to a tangent line of the cover interaction with the sheet material
26
, and a component FN normal to the tangent line. As shown in
FIG. 1
, as the blade
12
first cuts at the top of the book
26
and cover
22
, the normal force FN is directed into the book. At this stage, generally no chipout occurs.
However, as shown in
FIG. 2
, as the cut progresses through the lower curved section
28
of cover
22
, the normal force FN acting on cover
22
is directed away from sheet material
26
, and can cause chipout, since the force is directed away from the sheet material
26
.
One object of the present invention is to provide a method for producing a skewed spine in a book. Anther alternate or additional object of the present invention is to improve cutting of books, especially of the sides of books adjacent to the spine. Another alternate or additional object of the present invention is to reduce chipout in reciprocating blade trimmers.
European Patent Application No. 1 153 872, which corresponds to commonly-assigned U.S. patent application Ser. No. 09/570,203 filed May 12, 2000, discloses creating a skew in a collated sheet product.
The present invention provides a method for producing a profiled spine in a book having a first side defining a first plane, a second side defining a second plane and a spine, the method comprising the steps of:
clamping the book using a first clamp element contacting the first side and the second clamp element contacting the second side; and
moving the first element with respect to the second element so as to skew the spine by moving at least one of the first side in the first plane and the second side in the second plane.
The present method advantageously permits creation of a skewed spine, which can be advantageous in reducing chip out in trimming devices, for example.
Preferably, the method further includes trimming the skewed spine. The skewed spine may form a skew angle with respect to the first plane, the skew angle preferably being an acute angle. The trimming may proceed from the first side to the second side. The acute skew angle reduces the chipout effect of the trimming.
The present invention also provides a clamp having a first clamping element, a second clamping element for clamping a bound book, and an actuating device moving the first clamping element with respect to the second clamping element to create a shearing force in the book.
The present invention also provides a trimmer having a blade and a clamp according to the present invention.
REFERENCES:
patent: RE3422 (1869-05-01), Riehl
patent: 350318 (1886-10-01), Phelan
patent: 360330 (1887-03-01), Seybold
patent: 1250092 (1917-12-01), Cook
patent: 1764828 (1930-06-01), Cotton
patent: 3074304 (1963-01-01), Coie
patent: 3167987 (1965-02-01), McCain
patent: 5086681 (1992-02-01), Ruetschle et al.
patent: 5197364 (1993-03-01), Heutschi
patent: 6030163 (2000-02-01), Flannery, Jr.
patent: 2004/0020340 (2004-02-01), Burke et al.
patent: 1153872 (2001-11-01), None
Burke Timothy Andrew
Duquette John Brian
Ashley Boyer D.
Davidson Davidson & Kappel LLC
Heidelberger Druckmaschinen AG
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