Cutting – Processes – With reorientation of work between cuts
Reexamination Certificate
1997-11-04
2001-10-16
Peterson, Kenneth E. (Department: 3724)
Cutting
Processes
With reorientation of work between cuts
C083S733000, C083S934000
Reexamination Certificate
active
06302007
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for trimming the exposed lateral edges of printed bound documents conveyed individually or in quires, such as books, brochures or magazines, which are held at the bound lateral edge and brought to a trimming position in a processing plane which is oriented perpendicular to the trimming plane, by way of a translational conveying movement or a conveying movement of a trimming device and a rotational movement.
2. Description of the Related Art
In general, printed documents of the type described above are trimmed to the desired format at the three exposed lateral edges after the signatures forming the documents are bound or after a cover has been applied. It is also possible to trim several superimposed books together without the need for changing the clamping arrangement.
In CH-A-263,992 there is disclosed a so-called trimming device for trimming books and the like, which can be trimmed at three edges in a single clamping operation. For this purpose, a cross-bar which transversely bridges a rotating table, is positioned on a carriage and supported thereon by columns; a threaded nut is guided in the cross-bar. The threaded nut capable of moving vertically, but unable to rotate, supports a threaded spindle and has formed on its bottom side a pressure head for pressing against a pressure plate.
In this published application, there is also described a prior art rotating cutter wherein one or several books or the like are clamped on a rotating table which is supported on a carriage for movement perpendicular to the knife, wherein the three sides of the books are sequentially trimmed with a knife after each rotation of the table by 90°.
The embodiment according to the referenced CH-A-263,992 also provides the means for an application using the conventional technology described therein, wherein the rotating table can be rotated in several steps by 360°.
A trimming apparatus disclosed in EP-A-0,710,530 for trimming three lateral edges of a bound printed document includes, aside from a knife cooperating with a cutting table, cutting pliers capable of holding a printed document and provided with a positioning mechanism for holding the printed document at the bound edge, wherein the positioning mechanism can be moved translationally and rotationally relative to the knife.
Since the trimming operation is carried out in multiple steps, the trimming devices described above have disadvantages causing an extraordinarily low operating efficiency and hindering automatic loading.
It is thus an object of the present invention to provide a method and an apparatus for carrying out the method which will significantly improve the present operating efficiency while at the same time maintaining a high degree of reliability and quality.
SUMMARY OF THE INVENTION
The object is solved by the invention in that trimming of the top and/or bottom edge of two printed documents is accomplished in a single operating step. The processing can thus be carried out in part by a dual-benefit method, so that a noticeably improved processing efficiency can be attained.
For carrying out the method of the invention, there is provided an apparatus with a trimming device having a knife capable of being driven in a vertical plane of a substantially horizontal cutting table, and a positioning mechanism spaced from the cutting plane of the trimming device for conveying the printed documents held at the bound lateral edge, with the positioning mechanism capable of being driven about a rotational axis oriented perpendicular to the cutting table as well as in a stepwise fashion perpendicular to the trimming plane, the positioning mechanism further including a mounting plate of a clamping device connected to the positioning device, with the mounting plate forming a support which is co-planar with the cutting table, characterized in that the positioning mechanism has two independently controllable clamping devices facing each other with their back side at the rotational axis.
Other objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are intended solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims.
REFERENCES:
patent: Re. 3422 (1869-05-01), Riehl
patent: 263992 (1949-12-01), None
patent: 669 022 (1938-12-01), None
patent: 1 266 275 (1968-04-01), None
patent: 29 11 473 (1980-09-01), None
patent: 3938285 (1990-06-01), None
patent: 0 710 530 (1996-05-01), None
patent: 1 219 826 (1960-05-01), None
Darby & Darby
Grapha-Holding AG
Peterson Kenneth E.
LandOfFree
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