Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Reexamination Certificate
2001-09-10
2003-12-30
Rada, Rinaldi I. (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
C493S429000, C493S437000, C493S424000, C493S440000, C493S426000, C493S431000, C493S434000, C493S442000, C083S626000, C083S630000
Reexamination Certificate
active
06669619
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for folding printing copies.
The published German Patent Document 40 18 707 A1 discloses a driving device for folding knives, which is used in polygraphic knife folding machines. Proceeding from an effort to obtain a wide-range adjustment of the height of a folding knife driven by a crank drive, the crank drive including the drive shaft thereof is vertically adjustably disposed. The changes in position of gears of a spur gear transmission associated therewith are assured by supporting rollers, by a connecting lever and by the influence of a pre-stressable compression spring. It is thereby possible to adjust the thus oscillating folding knife over a wide range without affecting the kinematics of the drive.
The published German Patent Document 29 17 616 C2 relates to a drive unit for a folding knife for folding planar items. This drive unit includes a linearly acting drive aggregate, which is represented by a traveling-field linear motor that is formed of a reaction part and a secondary part and that is movably mounted in a frame-fixed guide. The movable part of the traveling-field linear motor is arranged so as to be displaceable during the folding cycle, the linear motor being formed so as to be controllable by the sheet to be folded, and devices for dampening and counter-braking the movable part are provided in front of the return or reversal points of the movable part.
Due to the use of the linear motor in this improved arrangement, the resulting construction is not suitable for high speeds such as can occur in web-processing rotary printing presses, such as rotary newspaper web presses or jobbing or commercial rotary printing machines. With the improved embodiment according to the aforementioned published German Patent Document 29 17 616 C2, tilting of the folding knife cannot be completely prevented with respect to an off-center folding of sheets.
The published German Patent Document 30 46 051 A1 discloses a folding device for web-fed rotary printing presses. A folding device for web-fed rotary printing presses is proposed with which a longitudinal fold extending in the longitudinal direction of printing copies is formed in the printing copy. The longitudinal fold is formed in the printing copy after a cross-fold has been formed therein. A folding knife extending parallel to the transport direction of the printing copies is provided, and is suspended from two driving cranks rotating with the same rotary speed and being moved reciprocatingly. In a lower position thereof, the printing copies to be folded longitudinally are pushed between two driven folding rollers.
The suspension of the folding knife from the driving crank is effected via an additional crank. The latter is borne coaxially with pivot pins thereof at the crank pin of the driving crank. The additional crank is driven via a gear transmission at the same rotary speed as that of the driving crank, but in a direction opposite thereto, the crank pin of the additional crank executing a substantially or at least approximately vertical lifting motion.
This construction is precise because the gear transmission that is used is associated with a considerable production outlay, particularly with respect to gear teeth accuracy, which is to be produced in an involved and costly manner. This construction is therefore associated with high production costs.
SUMMARY OF THE INVENTION
Starting from the constructions of the prior art aforedescribed herein, it is an object of the invention to provide a device for folding printing copies which, moreover, generates a linearly extending lifting movement of the folding knife and which is associated with a minimal construction outlay.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for folding printing copies in a web-fed rotary printing machine, comprising a folding knife, controls for reciprocatingly moving the folding knife at least approximately in one plane, the controls including a first and a second toggle lever, which, at one of the ends thereof, respectively, are movably attached to frame-fixed parts of the printing machine and at the other ends thereof, respectively, are movably attached to the folding knife, and a rotary element simultaneously actable upon both the first and the second toggle levers for operating the controls.
In accordance with a special feature of the invention, the folding knife serves for producing a second longitudinal fold in a printing copy in the transport direction of the respective printing copy.
In accordance with another feature of the invention, the rotary element is constructed as a double crank.
In accordance with a further feature of the invention, the toggle levers are connected to the double crank so that the toggle levers are driven at least approximately in parallel.
In accordance with an added feature of the invention, the rotary element is actable via a push rod upon the toggle levers, respectively.
In accordance with an additional feature of the invention, the rotary element is constructed as a single crank.
In accordance with yet another feature of the invention, the single crank is directly actable upon one of the toggle levers.
In accordance with yet a further feature of the invention, the second toggle lever is coupled via a push rod with the toggle lever upon which the single crank is directly actable.
In accordance with yet an added feature of the invention, the folding device includes vertical guides wherein the folding knife is guidable.
In accordance with yet an additional feature of the invention, the folding knife is movable at least approximately vertically up and down.
In accordance with still another feature of the invention, the toggle levers, respectively, are disposed by the one end thereof at a frame-fixed cross bar.
In accordance with still a further feature of the invention, the rotary element is cooperatively connected with the toggle levers so that when the rotary element rotates, the folding knife executes a reciprocatory motion.
In accordance with still an added feature of the invention, the rotary element is arranged centrally along an imaginary center line of the folding knife, and the two toggle levers are disposed on mutually opposite sides in vicinity of outer edges of the folding knife and are actable upon the folding knife.
In accordance with another aspect of the invention, there is provided a folder including a device for folding printing copies in a web-fed rotary printing machine, comprising a folding knife, controls for reciprocatingly moving the folding knife at least approximately in one plane, the controls including a first and a second toggle lever, which, at one of the ends thereof, respectively, are movably attached to frame-fixed parts of the printing machine and at the other ends thereof, respectively, are movably attached to the folding knife, and a rotary element simultaneously actable upon both the first and the second toggle levers for operating the controls.
In accordance with a concomitant aspect of the invention, there is provided an assembly including a folder having a longitudinal folding device for forming a second longitudinal fold in printing copies in a transport direction of the printing copies, the folder being preceded by a web-processing web-fed rotary printing machine, and the second longitudinal fold being producible after a cylinder crossfold is formed, the folding device comprising a folding knife accepted at two control members and being movable vertically up and down thereby, the folding knife, in a lower position thereof, serving to push printing copies between two driven folding rollers, the two control members being two driven toggle lever pairs disposed between a frame-fixed cross bar and the folding knife, and a rotary element for simultaneously controlling the toggle lever pairs, the rotary element being rotatable over one rotation thereof per one stroke of the folding knife.
The suspension of the folding knife, which is r
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Mayback Gregory L.
Nash Brian D.
Rada Rinaldi I.
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