Printing – Stenciling – Rotary machines
Patent
1998-04-16
1999-11-30
Yan, Ren
Printing
Stenciling
Rotary machines
101116, 101479, B41L 1300
Patent
active
059923130
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns an application apparatus for applying substance, in particular by means of a perforated cylinder rotary screen, to a moving surface, web or similar application surface with a carrier beam extending along the apparatus length across the application width, a doctor device connected to the carrier beam and a carrier beam mounting arranged at tire end face of the apparatus for mounting the carrier beam by both of its ends outside the application width.
Particularly for application apparatus such as rotary screen printing machines it is necessary to re-equip the printing machine having a multiple of printing units in which the doctor assemblies have to be exchanged at short time intervals, owing to the small application sizes customary in textile printing. The installation of the doctor assembly constituted by a carrier beam and doctor device is generally effected such that at first a carrier beam holder, which is at the side or the printing machine at which the doctor assembly is to be inserted into the rotary screen, is removed by lowering it, swinging it away or otherwise. Subsequently the doctor assembly is rotated manually by 180.degree. about the carrier beam, the doctor assembly thereby coming to rest upwardly, and then manually inserted into the rotary screen. To facilitate handling, the carrier beam rear side is frequently supported on the edge of the bearing opening of the rotary screen mounting and shunted to slide across this edge which results in wear and, in particular for large print widths, in the danger that damage to the screen results. The dismounting of the doctor assembly takes place in a corresponding manner. All in all the free manual setting up of the rotary screen printing machine is associated with considerable difficulties and disadvantages. The doctor assemblies can be handled only with difficulty owing to their large lengths (usually up to 3200 mm, 4200 mm including carrier beam) and the considerable weight (up to 35 kg) as well as the relatively small inner diameter (130-150 mm) of the end face bearing ring of the rotary screen. When setting up the printing machine there is a danger that the extremely sensitive doctor elements such as doctor blades and roll doctors are damaged and become unusable or that personnel occupied with the re-equipping injure themselves on the sharp doctor blades. When the doctor apparatus is swung upwardly by 180.degree. during dismounting, of leads to the soiling with dye of the normally clean apparatus portions as a result of dripping falling application substance so that a higher cleaning cost with regard to the amount of washing liquid, cleaning the and cleaning apparatus is necessary.
The development of doctor assembly technology tends towards ever longer, heavier doctor devices with ever larger carrier beam sections so that the stated difficulties in handling the doctor assemblies and particularly the amount of time for setting up rotary screen printing machines are increased. In particular considering the aspect of the already mentioned small application areas and the presence of a multiple of printing units with doctor assemblies to be exchanged in one printing machine (currently up to 24) an improved rapid handling gains considerably in importance.
SUMMARY OF THE INVENTION
The invention is therefore based on the object, to improve an apparatus of the type mentioned in the introduction such that the mounting and dismounting of the carrier beam with doctor device is essentially simplified and accelerated and also becomes less expensive, the working safety is increased, the risk of injury of operating personnel is reduced and the risk of damage to the apparatus components substantially decreased.
According to the invention this object is achieved in combination with the features of the application apparatus mentioned in the introduction in that at least one holding rail is formed on the carrier beam to extend with the latter continuously over at least the greatest part of the length of the latter and
REFERENCES:
patent: 5239922 (1993-08-01), Zimmer
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