Printing – Antismut device – Anti-offset material application
Patent
1991-02-28
1992-11-17
Burr, Edgar S.
Printing
Antismut device
Anti-offset material application
1014161, B41F 3506
Patent
active
051633701
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for dusting printed products with fine powder according to the preamble of claim 1.
Apparatus of this type are installed above the conveying path of the printed products on printing presses and dust the printed side of the freshly printed product with fine powder, in order that the printed products do not stick together by way of the layers of ink, when they are laid one on top of the other. The fine powder particles consisting of corn starch, CaCo.sub.3 or sugar have a particle size of generally between 10 and 50.mu. and are atomized in an air stream. This mist is directed by way of generally bar-shaped nozzle bodies towards the printed products, the axis of the bar body extending parallel to the conveying direction of the printed products and a plurality of such nozzle bodies being arranged in parallel one beside the other above the conveying path of the printed products.
The curtain of mist produced as a whole by the nozzle body arrangement must be so wide that it still completely covers even the widest printed products. If smaller printed products are printed, then one must either tolerate the fact that the part of the powder curtain which is laterally outside the printed product is produced to no avail and enters parts of the machine located below the conveying path of the printed products. This is a drawback both with regard to contamination of the machine as well as with regard to the cost of the powder material. If, on the other hand, the nozzle body arrangement is changed so that the width of the powder curtain corresponds to the width of the printed product, this involves a longer stoppage of the printing press, which is economically viable solely with very large numbers of copies.
The present invention therefore intends to provide an apparatus for dusting printed products with fine powder according to the preamble of claim 1, in which the width of the powder curtain produced by the nozzle body arrangement can be varied at short notice and without complicated adjustment work.
This object is achieved according to the invention by a dusting apparatus according to claim 1.
In the dusting apparatus according to the invention, only a single element has to be operated in order to vary the transfer spacing of the nozzle bodies, namely the actuating member for the spacing adjusting means. The position of the individual nozzle bodies necessary respectively according to the position of this individual actuating member is, on the contrary reached automatically and thus quickly.
Advantageous developments of the invention are described in the Sub-claims.
With the development of the invention according to claim 2, a strictly uniform, synchronous adjustment of the individual nozzle bodies is obtained in a simple manner, since it is sufficient to impart a predetermined relative movement to two separate points of the lazy tongs arrangement, which are selected at random, in order to obtain the desired synchronous adjusting movements of the nozzle bodies.
The same advantage is provided by a dusting apparatus according to claim 3.
In a dusting apparatus according to claim 5, one can displace the various nozzle bodies not solely strictly in synchronism by the same distances, but also by different distances, which have a fixed predetermined ratio with respect to each other. Nevertheless, only a single, mechanically moved drive rod is required, so that the mechanical construction of the dusting apparatus is simple.
With the development of the invention according to claim 6, it is ensured that after the adjustment, the nozzle bodies are respectively locked automatically in a reliable manner in the position to which they have been moved.
In a dusting apparatus according to claim 7, one has a finely regulated lateral adjustment of the nozzle bodies in conjunction with a very simple mechanical construction of the switching couplings, which control the adjusting movement of the individual nozzle bodies.
In this case, with the development according to claim 8, positive locking of the noz
REFERENCES:
patent: 2110052 (1938-03-01), Paasche
patent: 2110218 (1938-03-01), Green et al.
patent: 3333570 (1967-08-01), Paasche
patent: 4024815 (1977-05-01), Platsch
patent: 4622896 (1986-11-01), Laverick
patent: 4867063 (1989-09-01), Baker et al.
Burr Edgar S.
Hendrickson Lynn D.
Philpitt Fred
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