Bookbinding: process and apparatus – Apparatus – Book working apparatus
Utility Patent
1999-12-22
2001-01-02
Wellington, A. L. (Department: 3722)
Bookbinding: process and apparatus
Apparatus
Book working apparatus
C412S009000, C412S022000, C412S025000
Utility Patent
active
06168363
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for rounding and pressing book blocks and, more particularly, to a device for rounding and pressing book blocks having rounding rollers, pressing jaws or similar clamping elements, which are displaceable relative to one another, receive the book block and act with a defined force upon the book block.
2. Description of Related Art
In industrial book production, the book block with a rounded back receives the desired back shape corresponding to the cover type in the pressing processing section, said back shape being determined by a fold provided in the region of the back of the book block, which fold can be constructed either as a deep or flat fold. The pressing is effected by a molding tool, which is reciprocated over the width of the back of the book block and comprises a concave active surface, so that by applying pressure and friction, the folded printed sheets are bent over on both sides from the center of the book block back, namely at an angle increasing towards the outside. In this manner, the book block receives its mushroom-like back shape and at the same time a back stabilization. In order to effect the pressing procedure, the book block is clamped between pressing strips in such a manner that the rounded end is exposed and over hangs the pressing strips.
A pressing machine with a molding tool acting upon the book block back and with clamping jaws holding the book block is known, for example, from DE-OS 15 36 507. Proceeding from a cam disk with a cam roller supported by a toggle lever and running in a cam track, with articulated levers and further members, the two clamping jaws are displaced towards one another and hold the book block with a predetermined constant clamping force in order to effect the pressing procedure. Since the book blocks can vary in their thickness, the holding force cannot be optimally adjusted, with the result that, in the case of an excessive holding force, impressions are made on the book block or, in the case of a holding force which is too weak, a position displacement or slippage occurs in the clamping jaws. For different formats of the book blocks the clamping jaws can be mechanically adjusted relative to one another. This adjustment is time-consuming and therefore results in substantial production interruption.
In the Patent DE 36 13 120 assigned to the assignee hereof, a device on a book binding machine for adjusting clamping jaws via adjustment drives for providing different formats and different clamping forces for holding the book block is disclosed. To achieve this an external, electronic measuring device is used wherein a master block is clamped in place and the thickness of the master block is determined as a distance-dependent actual value which is evaluated in a computer and stored as a nominal value. The nominal value is transmitted via a control device to the adjustment drive as an adjustment value.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a device for rounding and pressing book blocks in which the clamping elements automatically adjust to different formats of the book block.
It is another object of the invention to provide a device in which the clamping elements automatically adjust to deviations in book block thickness.
It is a further object of the invention to allow for a simple product-dependent adjustment of the holding force in the clamping elements.
The above objects and other objects are achieved in accordance with an embodiment of the invention wherein the clamping jaws are displaceable relative to one another by levers which are articulated for providing automatic alignment of the book block. The clamping jaws clamp the book block via an operating cylinder that acts upon the free ends of the levers. The point of rotation of the levers is displaceably mounted in a guide aligned with the center of the conveying device of the book block. According to a further feature of the invention, the clamping elements are arranged in the form of pressing jaws on levers of a scissor system and clamp the book block by lever action via an operating cylinder acting upon the opposite ends of the levers, the axis of rotation of the scissor system being displaceably mounted in the guide.
Until now, the adjustment of the clamping elements to different book blocks has been effected mechanically or in connection with an external, electronic measuring device requiring the insertion of a master book block. In accordance with the present invention, a lever system is employed which is actuated by an operating cylinder and is centrally mounted in relation to the conveying device. The lever system comprises articulatedly connected levers which provide automatic alignment with the book block, symmetric closure of the clamping elements and automatic compensation for deviations in the book block thickness. As a result of the use of the lever system the adjustment of the clamping elements is effected, in a surprisingly simple and economic fashion. In order to carry out the pressing procedure, for example, the book block is held with the optimum holding force in the pressing jaws, which protects the product and contributes to the operational reliability of the device. Furthermore, the clamping force can be easily adjusted and limited, so that even delicate materials are always clamped with an optimal clamping force and are therefore held carefully in the pressing jaws.
REFERENCES:
patent: 5114293 (1992-05-01), Rathert
patent: OS 15 36 507 (1970-01-01), None
patent: 36 13 120 C2 (1987-10-01), None
patent: 40 05 948 A1 (1991-08-01), None
Alix Yale & Ristas, LLP
Henderson Mark T.
Kolbus GmbH & Co. KG
Wellington A. L.
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