Coating evening means for paper laminating machines

Abstract

Claims

V- -M G. w, CHARTERS 22 L4 1 COATING EVENING MEANS FOR PAPER LAMINATING MACHINES z Sheets-Sheet 1 Filed Jan. 15, 1940 QEQ 339 QBQ EES S I o Q Qm [nven for George W Charters By M nna-12,1940. aw. CHARTERS I 2 221,44 :COATING EVENING MEANS FOR PAPER LAMINAIING MACHINES Filed Jan. 15, 1940 2 Sheets-Sheet 2 m "1 Q 4 N Q y (I1 l l Q vi k I 9| #2 r J J Inventor F 7 George W Charters w wg-w i I Httdriys Patented Nov. 12,1940 PATENT OFFICE coamo me amass roa raraa CHINES mama m oetm mcaami cmwun. Application mmmis, 1e40, serum. 313.1191 scum, (cur-s3) My invention relates to a so-called laminating machine by whichtwo sheets of paper, imposed one on the other, are fastened together by an in-. termediate cementing agent. Laminated. machines areused for making moisture-proof sheets., In these sheets, the cementing agent is asphalt which is liquifled by heat and applied to one of the two sheets, which are then pressed togather by being run over "combining rolls. Laminated asphalt sheets are 'used to provide a moisture-proof covering for certain merchandise which must be protected against moisture, and for other purposes. Therefore, the dim of asphalt between the two laminated sheetsmust completely cover theirioined faces. If the film of asphalt does not do so, but leaves streaks without any film of asphalt, moisture willeventually strike through such uncovered and unprotected portions ofthe sheets, and, if the enclosediarticle is susceptible tomoisture, cause damage. I Asphalt is a more or less tackymaterlal, even when quite hot. [It is necessary to provide a means whereby the asphalt maybe applied vuni.- formly to one of the laminated sheets, so as to coat the same completely; and it is further necessary, in order to avoid waste of asphalt, that i the coating be varied in thickness according to requirements. At the same time, the coating must be uniformly and evenlyapplied, so as to provide a moisture-repellentlayer orfllm completely covering the whole area of the sheet. The means heretofore provided for spreading the asphalt coating on the sheet according to the prior art known to me; failed in their operation. These prior means, briefly described, include a rod of small diameter over which the sheet is. drawn as it leavesthe coating element. The rod is rotated in opposite direction from that in which-the sheet travels. The rod is'termed an 40 evening rod because of its function, which maybe said to be similar to that ,ofa "doctor" as the latter term is commonly employed in papermaking devices. 1 Being of small diameter, the rod must be rotat- 45 ablysupported along its entire length; otherwise it will bend downwardly along its middle portion, in response to the weight of its unsupported middle portion, and thus bend away from the sheet, w and no evening of theasphaltcoating applied to supported in a bracket-like bearing along its entire length, said bracket having asemicircular groove formed in its upper face, such groove bea ing concentric, and covering and contacting a substantial portion of the circumferenceof the the sheetwould result. ;Therefore, the rod is evening rod; and one of the edges of said grooves is intended to function as a scraper, removing the asphalt and dirt particles which might adhere tothe rod It is essential that the evening rod be keptabsolutely smooth and clean; inother words that all:surplus asphalt andgrit beres moved from its surface. In practice, the arrangement of the devices heretofore employed for this purpose permit more or less small portions of asphalt to be dragged in, by the rotation of the rod, between its circumference and thesemicircular, groove in which it bears. ,This is due to the relatively broad surface or shoulder which the top of the rod-supporting bar constitutes in front of the semi-circular groove in which the eveningrod bears. Particles of dirt likewiseare dragged in between the rod and its bearing. In consequencethc rod when so mounted fails to produce constant even and uniform distribution of the asphalt over the entire area of the sheet. This face isgreadily discernible by holding the sheet up against a light. will be plainly seen, showing that there is no asphalt between the sheets at the streaks, and such Translucent streaks a laminated sheet is in consequence unfit for use as a moisture excluding medium. My invention consists in the providing of a horizontally supported bar, the top of whichis provided with two longitudinally-extending, Vera tical knife-edges,spaced apart by a relatively narrow vertical groove. On these knife edges, there is rotatably supported an eveningrod of slightly greater diameter than the widthof said groove. In this way, when the evening rod is rotated, one of said knife-edges will function to scrape off from the cylindrical surface of the rod all asphalt and dirt adhering thereto; but should some asphalt, or particles of dirt, get by the first knife-edge, such would be caught and scraped ofl' the surface of the rod by the second knife-' edge, into the channel between the two knifeedges, and as a result the evening rod is kept perfectly clean and smooth,so that it can efiiciently perform its duty. The further details of my invention are herei inafter fully described with reference tothe ac companying drawings. i i n Inthedrawings: i i I Figure 1 is a schematic side elevation of a paper laminating machine embodying my invention; Figure 2 is a diagrammatic front elevaton of l the same machine, the evening rod, and the support therefor being shown in full lines while the cooperating parts of the machine are shown in lighter broken lines: Q a bar It preferably made of softer metal such as Figure 3 is a vertical transverse section taken on a line 3--3 of Figure 2 but drawn on a larger 1 scale; Figure 4 is a transverse section takenon the line 4-4 of Figure 2 with portions of the pan holding the coating material and the coatin oll shown in broken lines. This figure also illustrates means for lifting the evening rod-supporting bar at the middle thereby to give the eveningrod a crowning effect; and Figure 5 is a greatly-enlarged transverse sectional' view of the evening rod and the knife edges of the upper portion of its supporting bar. Referring first to Figure 1 and the general arrangement of the various rolls and parts of the laminating machine, thereby illustrated, the sheet I of paper a. which is to receive the coating of as-, phalt (or similar laminating material) is drawn oi the parent roll b. The sheet a-passes from the roll b over the guide rolls 0, d, e, f, and g to the coating roll i. The coating roll 2, is partly submerged in a :i, containing the coating material, specifically the liquid or liquified as- 'phalt. said pan being understood'to be heated when asphalt is used as a coating material. Referring also'to Fig. 2, to one end of the evening rod I0 is keyed a pulley I l which is connected by a belt l2 to suitable means (not shown) for imparting rotary motion to the evening rod in a direction opposite tothat in which the {paper sheet a travels. Due to thelngth of the evening rod and its from the sheet will cling to the cylindrical vsurface of the'evening rod and tend to build up ridges of the asphalt, thus rendering the evenin rod inefficientas a doctor forremoving all surplus of 'material from and also evenly spreading suchmaterial over the surface of. the sheet. The evening rod l0, preferably made of stainless steel, is supported along the entire lengthby bronze. Thus this bar instead of the evenin rod will sustain the wear of the surface. The bar M is supported at its ends by angular brackets l5, removably attached to the frame of the machineas illustrated in Figure 2. v The upper portion of the bar I4. is provided with two parallel vertical knife edges 7 l3,- l3a spaced apart by'an intermediate vertical groove l8 of substantialdepth as illustrated by Figures 3 and 5. vAssuming the evening rod 10 to be it. or inch in diameter, the width of the groove Ill-should be approximately men. A pair of U-shaped clamps l6 and clampingscrews I! hold the evening rod ID on the supporting knife edges I3, I31: of the bar Hi; the clamps l6 being arranged so as to permit the evening rod to be rotated within them. The preferred coristruction of the upper portion of the bar I4 is illustrated by Figure 3. :The sides of itsupper portions are beveled substantially asshown at l9-l9 in Figures 3 and 5 to facilitate the maintaining of the knife edges l3, l3a sharp. By making the supporting bar of softer material and beveling its upper sides as mentioned, the knife edges, I3, I30. may be readily kept sharp by running a round file of slightly greater diameter than the width of the slot l3 back and forthover and between the knife edges. 7 I provide the two knife edges l3 and l3a spaced apart by an intermediate groove l8 of substantial depth as mentioned, sothat when the evening rod is rotated, one of said knife edges I3, will function to scrape off from the cylindrical sur face of the rod all asphalt and dirt adhering thereto. But should some asphalt or particles of get by the first knife edge, such would be caught'and scraped off the surface of the rod bythe second knife edge l3a. and the surplus coating or grit scraped off bythe second knife edge l3a'will be discharged in the groove l8 over the entire width of the sheet and thus -enable the rod effectively to perform its function of distributing and evening up the coating applied to the sheet, I provide means for slightly raising the middle of thesupporting bar l4 and by so doing give the evening rod a crowning effeet as it were.* A middle strap 20 is fastened to a side of thepan 7'. An angular lever 22 is fulcrumed on the strap 20 and the upper extremity of this lever is formed as at 23 so as to provide a seat for the bottom edge of the supporta ing bar It. A screw 2| is inserted through the lower end of the lever 22and threaded into the strap 20 and serves to hold the lever in position as arranged. By manipulating the screwr2l the angular" lever 22 may be adjusted so. as to exert leverage on the bottom, edge of the supporting bar 14. and thus raise the same slightly. The above described details of construction of my "invention are merely such as I found convenient; butthe same maybe variedv as deemed expedient, so long as, the principle of my invention be adhered to. i I claim: . 1. Ida laminating machine having devices for moving and guiding the sheetto be treated, and means for applying a coatingto one side of the 3 sheet, a device for evening the application of the coating comprising, a horizontally-supported bar, the top of which is provided with two longi tudinally-extending" knife-edges spaced apart by a relatively narrow vertical groove of substantial depth, an evening rod of slightly greater diame= ter than the width of said groove and supported on said knife-edges, the end ofthe sheet on leaving-said coating means passing over said'eveningrod, and means for rotating said'r'od in the direction opposite'to the travel of the'sheet. 2-11m laminating machine' having devices for moving and guiding the sheet to be treated, and means for applying a coating to one sideof the sheet, a device'for evening the application of the coating comprising, a horizontally-supported bar, the top of which is providedwith a central, longi--'' i of said evening rod being approximately and rotatable on said knife-edges, and means forrotating said rod. 3; The combination described in claim 1 with the spacing of said knife-edges and the diameter 55 respectively. 4. In a laminating machine having devices for moving and guiding the sheet to be treated, and means for applying a coating to one side of the sheet, a device forevening the application of the coating comprising, a horizontally-supported bar, the top of which is provided with two longitudinally-extending knife-edges spaced apart by a relatively narrow vertical groove of substantial depth, said bar adapted to be slightly convexed upwardly in a vertical plane, an evening rod of slightly greater diameterthan the width of said groove and supported on saidkniie-edges, the end, of the sheet on leaving said coating means passing over said evening rod, means for holding said evening rod rotatableomsaid knife-edges, means for rotating said :rod, means for slightly raising the evening rod at the centeig-thereby to convex the same slightly, upwardly, longitudinal- 5 In a laminating machine having devices for moving and guiding the sheet to be treated, and means for applying a coating to one side of the sheet, a device for evening the application of the coating comprising, a horizontally-supported bar, the top of which is provided with a central, longitudinal, vertical, relatively narrow groove of substantial depth, the exterior sides of the top of the barconverging towards the edges of said groove respectively and forming knife-edges therewith, an evening rod of slightly greater diameter than the width of said groove and supported on said knife-edges, the end of the sheet on leaving said coating means passing oversaid evening rod, the spacing of said knife-edges and the diameter of saidevening rod being approximately 3", and respectively, means for holding said evening rod rotatable on said knife-edges, means ,for rotating said rod, means for slightly raising the evening rod at the center, thereby to convex the same slightly, upwardly, longitudinal-1 ly. 1 GEORGE w. CHAR'I'ERS.

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