Coating apparatus – Projection or spray type
Reexamination Certificate
1998-08-28
2001-06-12
Crispino, Richard (Department: 1734)
Coating apparatus
Projection or spray type
C118S108000, C118S109000, C156S109000, C427S208200, C193S0350SS, C193S0350TE, C193S037000, C198S817000, C198S836200
Reexamination Certificate
active
06245145
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a device for coating of spacer frames for insulated glass panes with adhesive and sealant with the features of the introductory part of independent claim
1
.
BACKGROUND OF THE INVENTION
Devices for coating of spacer frames for insulated glass with adhesive and sealant are known. See, for example, U.S. Pat. No. 4,949,666 A.
All known devices for coating of spacer frames have two or more pressure rollers which press the section of the spacer frame which has passed between the nozzles from which the sealant and adhesive is applied to the side walls of the spacer frame for insulating glass panes, against the transport belt of the conveyor. The pressure rollers in the known devices abut the inside wall of the hollow section strip which forms the spacer frame. This means that the pressure rollers need not only be swivelled away when the legs of the spacer frame which project upwards from the conveyor move past the pressure rollers during the coating process, but that they must also be swivelled away when spacer frames with staves are being coated with sealant or adhesive. In addition, the pressure rollers of the known devices do not cause any lateral guidance, i.e. no guidance transversely to the plane of the spacer frame so that in the known devices, viewed in the direction of motion of the spacer frame, in front of the nozzles there are guide elements, for example, in the form of rollers, to guide the spacer frame exactly between the nozzles.
SUMMARY OF THE INVENTION
The object of the invention is to improve the known devices such that the drive rollers not only cause the necessary frictional connection between the conveyor belt of the conveyor and the spacer frame, but also guide the spacer frame laterally, and that they need not always be swivelled up when a stave moves past the pressure roller while a spacer frame is being coated.
Because as claimed in the invention the pressure rollers engage the spacer frame leg which moves through between the coating nozzles and which lies on the conveyor only in the area of the side edges of the inside surface of the spacer frame, they need only be swivelled up more when the legs of the spacer frame which project upward from the conveyor move past the pressure rolls, while the spacer frame is being coated. When staves located within the spacer frame move past the pressure rollers, the latter can continue to engage the leg which lies on the conveyor. In this way the control effort is greatly simplified and devices which grip the staves and trigger swivelling of the pressure rollers upwards become unnecessary.
If according to one version of the invention it is provided that two pressure rollers at a time are located opposite one another, this yields especially reliable guidance of the leg of the spacer frame lying on the conveyor.
In one embodiment of the invention it can be provided that the pressure rollers are staggered rollers, with the part with a smaller diameter in the area of the outside edge of the inside surface and with the annular surface aligned perpendicularly to the axis of rotation abutting the side surfaces of the hollow section strip. This embodiment has the advantage that the pressure rollers engage solely in the area of the upper longitudinal edges of the spacer frame leg lying on the conveyor and still secure guidance is accomplished. Here it can be provided that the annular surfaces touch the side surfaces of the hollow section strip only in its area adjacent to the inside surface. This yields the advantage that an adhesive or sealant applied to the side surfaces of the hollow section strips is not touched by the pressure rollers.
In one alternative embodiment of the invention it can be provided that the pressure rollers are conical rollers with cone surfaces which adjoin the side edges of the inside surface of the hollow section strip which forms the spacer frame. This embodiment has the advantage that the pressure rollers need be adjustable in only one direction for matching to the different section dimensions.
Here it is preferred that the pressure rollers are held adjustably in the direction of their axes; this allows a simple construction.
In certain cases, as claimed in the invention it can be additionally provided that the distance of the pressure rollers from the conveyor belt of the conveyor can be changed. This embodiment makes it possible to match the pressure rollers, even if they are staggered rollers, to all possible section cross-sectional shapes which occur in practice.
REFERENCES:
patent: 4546723 (1985-10-01), Leopold et al.
patent: 4949666 (1990-08-01), Lisec
patent: 5295292 (1994-03-01), Leopold
patent: 5695186 (1997-12-01), Phillips et al.
patent: 0 585 534 (1994-03-01), None
Crispino Richard
Lorengo J. A.
Young & Thompson
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