Coating apparatus – Solid member or material acting on coating after application – Rotary member
Patent
1998-04-16
1999-05-11
Edwards, Laura
Coating apparatus
Solid member or material acting on coating after application
Rotary member
118119, 118123, 118126, 118413, 118414, 118419, 427356, 427359, B05C1/00
Patent
active
059024003
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an applicator apparatus for applying substance to an application surface such as a web or the like moved relative to the apparatus with a carrier beam extending in the longitudinal direction of the apparatus over the application width, with a doctor holding portion supporting a roll doctor or doctor blade element, the doctor element and the doctor holding portion forming a doctor unit that is magnetically pressable against the application surface, and with a holding connection that produces play in a direction transverse to the application surface between carrier beam and doctor unit.
It is known from an apparatus of corresponding type (EP-A-0 504 501) to hang a doctor holding portion on a carrier beam with a single-armed connection. The doctor holding portion is formed and arranged such that the corresponding doctor element is at least marginally slidably movable inside the doctor holding portion with all degrees of freedom transverse to the doctor device longitudinal axis. It has been shown that instabilities can arise. The doctor holding portion is provided pivotally hinged on the holding arm by means of a slide and clatter joint to enable the carrier beam to be displaced parallel to the application surface for positioning the doctor. The doctor element must be flexibly mounted and the device in unsuitable for use in rotary screens.
In another known device (AT-B-392 745) the doctor holding portion is hinged for rotation. By means of the hinge connection the doctor unit is to be self positioning as a result of the magnetically generated pressing force. It is true that the position of the doctor element is brought about automatically by magnetic force. However, under operating conditions the doctor holding portion tends to diverge sideways undesirably. In practice, special additional measures are necessary to position the doctor device. For example the machine assembler helps himself by providing special positioning clips.
The invention has the object to provide an application apparatus with improved positioning and stabilising of the doctor element in order to avoid laborious pre- and post adjustment using supplementary elements and to improve the application quality; at the same time the connection between carrier beam and doctor element should be particularly simple, compact and comfortable to use.
The object is achieved in combination with the features of the apparatus mentioned in the introduction in that the holding connection between carrier beam and doctor element comprises at least a pair of exclusively translatorily movable, mutually engaging sliding holder elements which form a sliding guide plane adjustable to the region of the zone of contact of the doctor element, the sliding holder elements being tilt-resistantly connected together such that the moments, which arise as a result of the thrust acting on the doctor unit during doctor operation, act without loss of moment with regard to a point of application on the carrier beam. The connection of the doctor holding portion with the carrier beam according to the invention is a telescope-like glide-sliding connection of sliding holder elements that forms a sliding guide connected to resist rotation to the carrier beam, the sliding guide holding the doctor holding portion slidingly movable along a bearing plane that extends parallel with the apparatus longitudinal axis and is alignable with the area of the contact zone of the doctor element. The doctor holding portion is rigidly connected with the carrier beam with respect to the thrust which acts on the doctor holding portion during doctor operation, the doctor holding portion being translationally slidable along the sliding guide plane perpendicular or nearly perpendicular to the application surface by means of a magnetic pressing force applied to it. The telescope-like sliding guide according to the invention permits the carrier beam to be held both freely pivotable and also not rotatable in the carrier beam bearing. It has been found that conventional application/printi
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