US1979758A

US1979758A - Coating apparatus

Info

Publication number: US1979758A
Application number: US629405A
Authority: US
Inventors: Ericsson H Merritt
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-08-19
Filing date: 1932-08-19
Publication date: 1934-11-06
Anticipated expiration: 1951-11-06

Description

Nov; 6,1934. E. H. MERRITT 1,979,758,-

COATI NG APPARATUS Filed Aug. 19, 1932 INVENTOR Patented Nov. 6, 1934 TENT OFFICE UNITED sra'res 1 Claim.

This invention relates to coating apparatus, and more particularly to apparatus adapted for the continuous application of liquid material to a surface of objects such as veneer sheets and the like.

An object of the invention is the provision of apparatus for use in the continuous application of liquid materials to surfacesin a particularly efiicient and effective manner.

A further object is the provision of apparatus whereby the coating of the under side of sheets is avoided.

Other objects of the invention will in part be obvious and will in part appear hereinafter,-

The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be in- 20 dica-ted in the claim.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing, in which:

' Figure 1 is a longitudinal sectional view of one form of apparatus embodying the invention;

Fig. 2 is a fragmentary view, taken from above, showing theactive run of the conveyor means, with veneer sheets carried thereon;

Fig. 3 is a fragmentary sectional-view, illustrating a modified form of apparatus; and

Figs. 4 and 5 are detail views of the form of belt construction shown in Fig. 1.

In the application of liquid material to veneer sheets for the purpose of providing an adhesive material, for assisting in the use of adhesive material otherwise applied, for providing a coating on the surface of the sheets, or for other purposes, 40 the operator is faced with problems inherent in the necessity of running sheets more or less spaced from one another, and of using sheets of difierent widths in successive, continuously conducted operations. i

There is accordingly a considerable amount of glue or other liquid deposited on the conveyor elements either between the ends of the sheets or at points beyond the sides of the smaller sheets. Obviously, it is undesirable that sticky or corrobelts should bedcposited on the underside of a sheet carried by those portions of the belt when they'again come around to sheet-moving position.

With the foregoing and other considerations inv view, the present invention contemplates the prosive liquids which are sprayed on portions of the vision in connection with spraying mechanism of conveying means of such character that a multiple point support isprovided for, the sheets; and, in certain of its more specific aspects,-likewise contemplates the provision of recovery meansfor 50 the liquid and of cleaning means for the belts.

Inthe form of apparatus exemplified in Fig. 1, there is provided a spraying mechanism 10. which may be of the type which reciprocates from thereunder and which is adapted to eject a spray downwardly on the said path. Beneath the spraying mechanism is a conveyor means 11 comprising a plurality of belts 12 mounted on a roller 13'and a roller 14 which. may besuitably power w driven. Each of the belts 12 is provided with av supporting portion comprising a plurality of points 15, so that any liquid carried by the portions of the belts moving into active position can not be transferred to any material area on the bottom of the sheets carried thereby. At about the centre of the inactive run of the belts, there is provided an idler roll 16, whereby the beltsare held in a cleaning bath 17 fora portion of their run. In order to clean the belts with particular effectiveness, there is provided in the present inside to side of thepath of movement of sheets 55 stance a fluid-ejecting means 18 whereby asp ray of fluid which may be either gaseous or liquid, but which is preferably a liquid, such as'water, is ejected upon each of the belts. In order to catch the liquid sprayed, there is provided'a' baflie means, which in the present'instanceis provided by thesurface of the roller l3, anda receiving trough, which in the present instance is provided by a portion of a, container 20 for the bath 17. Beneath that portion of the active run of the belts 12 toward which the spray isdirected by the spraying mechanism 10, there is provided a recovery catch basin 21 which, as will be noted-(Fig. 2) extends out on either side beyond the outermost belts 12. From the catch basin 21, a return pipe 22 leads to a reservoir which may be suitably connected with the spraying mechanism 10.

In the exemplified construction, there is'prom9 vided a delivery conveyor 23, whereby the sheets may be brought to the conveying means 11, and a removal conveyor 24, whereby coated objects may be taken away for succeeding operations.

In order to transfer the sheets evenly and smooth- 1% ly onto the points carried by the belts 12-, there is provided a supporting means 25, formed with depressed end portions and disposed between the conveyor means 23 and the conveyor means 11. Similarly, there is provided between the con- 2 veyor means 11 and the conveyor means 24, a supporting means 26 having depressed end portions.

As will be understood, the cleaning means may consist of one or more baths, one or more fluidejecting means, or any suitable combination of such elements. In Fig. 3, there is shown an arrangement wherein the cleaning bath is eliminated, but wherein there is utilized a. pair 01 liquid-ejecting means 180 and 18b acting on the belts at a point where they are free from the roller 13. In this instance, there is provided catch means comprising a baflie 2'1 and a reception trough 28.

In Figs. 4 and 5, there is exemplified in detail one form of belt construction adapted i'or use in accordance with the invention. A rubber strand 29 which in cross section is a truncated inverted triangle, has driven therein a plurality of spikes 30 having upwardly projecting points 15a.

It will accordingly be seen that there is provided an arrangement whereby the coating of objects may be accomplished-with an extraordinarily high degree of ei'iiciency and in a manner wherein the uncoated surfaces of the objects are preserved in substantially their original state, and that this is accomplished without material loss of the spraying liquid.

Since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

Coating apparatus, comprising material-applying mechanism and endless conveyor means for moving objects under said applying mechanism, said conveyor means including a plurality of rubber strands having a plurality of outwardly extending spikes mounted thereon at sufliciently close intervals so that the object will be supported by a multiplicity of spikes.

ERICSSON H. MERRITT.