US1867399A - Method of making stencil frames - Google Patents

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H. P. ELLIOTT METHOD OF MAKING STENCIL FRAMES Filed June 11. 41951 2 Sheets-Sheet July B2, lg H; P. ELLHOTT METOD oF MAKING STENCIL FRAMES Filed June l1. 1951l 2 Sheets-Sheet 2 ranma July 12, 192.24

UNITED .STTs

vrica HAMON. ELLIOTT, F WATERTOWN, MASSCHUSTTS METHOD 0F iw Application inea June 11,

secured over one ofthe sheets and over a wino dow therein. The specific stencil comprises 'a sheet of stii paper which is folded on o posite sides of and encloses and is adhesive y affixed to the thinner paper sheet. The thin paper sheet and the folded sections of the thick sheet all have registering windows and a stencil sheet is secured to the thin sheet over l5 the window therein. Such stencils are manufactured by a machine constructed generally as illustra-ted in the Elliott Patents #1,121,080 and #1,140,889.

ln the stencil manufacturing process, the

2 thick paper sheetis withdrawn from a roll thereof and is passed through devices where the windows are blanked out and adhesive is applied to one surface of the sheet and the sheet is folded along its medial longitudinal 2 line. The thin sheet is withdrawn from a roll thereof and is fed into the space between the folded portions of the thick sheet, as these portions are being folded, and thus is adhesively fixed to the folded portions.' During a subsequent operation, the windows are blanked out ofthe thin sheet and the separate stencils are blanke'd out of the combined folded sheets. l

The paper sheets which comprise the stencil frame are hygroscopic. Thus the stencil frame will curl orbecome warped out of its intended iat plane if the moisture content or hygroscopic condition of one sheet of the `trame is diierent from that of the other sheet of the frame. A warped stencil is highly undesirable as the successful feeding of the stencils in an addressing machine depends largely upon their latness. Y

It has been attempted to provide the same moisture condition in both sheets .by storing kthe rolls of the two sheets close together in' the same room so that they would both be subjected to atmosphere of the same degree l of humidity. This method is not entirely successful, however. as it is found that the KING STENCIL FRAMES 1981. Serial No. 543,581.

moisture content of different portions of the sheet vary with their positions in the roll, and that themoisture condition of a convolution of the roll of thick paperstrip may be different from a similar convolution of the roll of the thin paper strip due to daily variations in humidity of the atmosphere 1n the room and also due to differences in the thickness and density of the two strips. Consequently, the moisture conditions of the confronting parts of the strips in the manner in which they were ordinarily combined might be different so that the severed stencils might still have a tendency to warp. Consequently an i object of the present invention isa method of storing the strips so that those portions which cooperateto make a'single stencil will have practically the same moisture condition and in' combining the strips so that those parts having practically the same moisture conditions will be combined together.

A. further object of the invention consists in winding the two strips that compose the' stencil frames in one roll, storing the roll until .moisture conditions are the same in contacting portions of the two strips, and in combining the strips in a series of stencil frames in the same relative' order as the strips lie in contact or in confronting relation with each other in the rollso that those localities of 'the strips that have the same moisture condition are combined together in the stencil, thereby to prevent the warping of the stencil. y

, In utilizing the above method of making stencils,' certain modications inthe usualstencil makin apparatus are desirable order to combine the two strips in ,approximately the same relation that they are 1nA the roll and such modification constitutes a further object of the present invention.

Another object of the invention is generally to improve stencil process and apparatus.

l Fig. 1 is a side elevation of the essential features of a roll winding mechanism for preparing the rolls of paper in accordance with the present invention.

Fig. 2 is a plane view of themachine of Fig. 1.

Fig. 3 1s a perspective view of one of vthe rolls made by the machine of Figs. 1

line 5-5 of and 2.

Figs.4 and 4a represent diagrammatcally the stencil making machine or combining the strips contained in the roll of Fig. 3 into a ,series of stencil frames.

' Fig. 5 is a lan view of Fig. 4 taken along- Fig. 6 is a z(iers y tive detail of a section -orf the stencil ames produced by the machine of Fig. 4.

The stencil frame made in accordance with the present process and apparatus is represented in Fig. 6 which illustrates a strip ofv connected stencil frames from which the se arate frames are subsequently blanked. e strip comprises a long sheet 10 which usually is relatively thin and is located between and is axed to the reflexed portions of a relatively thick sheet 12. The reilexed portions of the thick sheet have registering windows 14 formed therein. Se arate stencil frames are subs uently bl ed from the strip as indicated y the dotted lines 16 and a window 18 is also blanked out of the thin intermediate sheet 10 within the windows of the thick sheet.. .A thin stencil sheet,not shown, is secured to the exposed portion of the sheet 101 over the window therein and completes the stencil. If the confronting sections of the sheets 10 and 12 have dierent moisture conditions' at the time they are combined together,A the stencil will war and it is the mam purpose of the present invention totreat the sheets and to combine them in such a manner that `the moisture conditions of the combined sheets in the stencil is the same, although the moisture condition ofthe sheets may be diierent in stencils made from widely` different localities of the sheets.

In accordance with the present invention long lengths of the narrow inner sheet 10 and the wide outer sheet 12 are wound tother in a common roll 2() as illustrated in ig. v3, the convolutions of the inner sheet 10 lying between and in contact or 1n confronting relation with the convolutions of the wide sheet. The rolls are automatically wound by the machine illustrated in Figs. 1 and 2 which winds three rolls 20 at the same time. A roll 12a of paper 12 of sufcient width to form three rolls 20 is ro y tatably sup orted in bearings 22. Three rolls 10a, o paper 10, are rotatably supported in bearings 24. The broad sheet asses from `the roll 12a betweenw1 ing elts 26 that remove dust and loose res from the aper and over a roll 28 and thence downwardly over a roll 30' and between this roll and slitting rolls 32 where the broad ,sheet is slit into narrowsheets Y 12. The

sheets 10 from the .rolls 10a pass above the roll 28"and over shoes'34 where each com- Q5 bines with a separate strip 12fand both are through cleanin 1,'sev,see

wound together to form one or another 'of the rolls 20 on the shafts 36. The shafts are rotated by a pulley 38 which drives a gear 40 that in turn through'other gearing 42 rotates the shafts 36.

rated by the rou 2o, Fig. e, are vstored une; the moisture conditions of the portions of the twosheets adjacent each other are thesame.' The sheets are then combined together to form the stencil frames by the machine illus'- trated in Figs. 4 and 4a. A roll 20 of the combined sheets 10 and 12 is rotatably su ported at one end of the machine. lThe widb sheet 12 thereof is withdrawn from the outside of the roll and makes a lurality of asfes 44 over idler ulleys or ro '46,' and t rence passes 'upwardly and over one end of an idler roll 48. The narrow sheet V10 of the roll 2O is also withdrawn from the outer part of the 158 of the` blanking mechanism. The .Wide

sheetl asses between two superimposed rolls and) 62 which score the outline ofthe windows 14 in the sheet and also the longitudinal median line of fold. The sheet thence passes between the superimposed rolls 64 and 66 which'blank out the material within the score lines of the windows. The sets of rolls 60,l 62 and 64, 66 also advance the sheet in a sheet on opposite sides of the median line of.

fold to approach each other. The folding is finally completed andthe folded strip is driven by press and driving rolls 78 and 80. The strip thence passes in edge form onto a rotating table 82' where it rests loosely on the table in roll form and is wound automatically thereon-by the rotation of the ta- 'The combined sheets in roll form, as illus- 7 ble. The narrow strip 10 passes from the roll 48 over'the rolls 52 and at one side of the sheet 12 and thence under the roll 84 and felts 86. The sheet then passes downwar ly and 'about the roll 56 and upwardly and over rolls'88 land 90 where it bridges the space taken lp bg y that operates'on the wi e "s efet 112. From the roll 90,the sheet 10 thence passes downthe apparatus v wardly at one side of the sheet 12 and over a liti roll 92 and thence upwardly over a roll 94 that is disposed at a horizontal angle with the line of movement of the sheet 12. From the roll 94 the sheet -10 passes under the sheet 'arebeing folded own so that the folded over portions of the sheet 12 are caused to be pressed a ainst and adhesively aiiixed to the sheet y the pairs of rolls 78 and 80.`

The varlous ortions of the sheets 10 and 12 are intende to be combined together at the rolls 7 8 in approximately the same relative ositions that they occupied in the roli 20. o this end, the length of each sheet between the roll and the press rolls 78 is intended to be approximately the same. lt is not essential that those portions of the two sheets that were in contact or in confronting yrelation in the roll 20 must be directly in dit registration with each other at the rolls 7 8 but there must not be so much displacement between the two sheets that the portions that are combined together are at harmfully different moisture conditions. Thus one of the reasons orthe passes 44 of the sheet 12 is to draw oi Ia great enough length of the sheet 12 so that the lengths of the two sheets is about the same between the roll and the combining positions.

Thus in accordance with this invention, the corresponding portions of the two sheets 10 and 12 that comprise the frame of a stencil are stored together so that they have the same moisture conditions and are united together in the stencil frame. Consequently the stencil frame is free from tendency to warp.

I claim:

frames composed of two united paper sheets which consists in providin long lengths yof such sheets that mayhave iierent moisture conditions in dierent localities located along the length; thereof, and combining together such portions o the sheets as'have the same moisture conditions.

2. The method of making stencils having frames composed of united 'paper sheets which consists in providingv sheets, the moisture condition of which may vary in dierent areas thereof, and combining the sheets with areas of the lame moisture condition in registration with each other. y

3. The method of making stencils having frames composed of two unlted paper sheets which consists in winding long lengths of the two sheets together inroll form with the convolutions of onev sheet dis sed between the convolutions of the other s eet, withdrawing the sheets from the roll and combinin the sheets into stencil frames in the same re ative relation they occupied in the roll.

4. Ilhe method ofy making stencils having frames of united paper sheets which consists until confrontin 1. The method ofmaking stencils having in winding long lengths of the sheet together in roll form so that the convolutions of one sheet lie between the convolutions of the other sheet, storing the -roll until moisture conditions of confronting sections of the two sheets are the same, withdrawing the sheets from the roll and combining them into the stencil4 frames with localities of thesheets having the same moisture condition in registration with each other.

5. The method of making stencils having frames composed of united paper sheets which consists` in winding long lengths of the sheets together in roll form with the convo- `lutions of one sheet lying between the convolutions of the other sheet, storing the roll until moisture conditions of confronting localities of the sheets are the same, and combining the sheets into stencil frames.

6. The method of making stencils having frames composed of united pa er sheets which consists in assembling long engths of the two sheets together, storing the sheets localities oi the sheets having the same moisture condition, and uniting the sheets into the stencil frames with the localities having the same moisture condition sheets which consists in winding long lengths f of sheets into roll form with one sheet lying between convolutions of the other sheet, storing the roll until moisture conditions in confronting localitiesof the sheets are the same,

unwindln the sheets from the'roli and separating t e sheets, subsequently combining the sheets into stencil frames with localities of the same moisture condition bein in registration, yand providing substantie y equal lenfgths of the separate sheets between the roll an the combining position.

stencil frames composed of united paper sheets which consists in winding long lengths of the paper sheets together into roll form with the convolutions of one sheet'being located between the convolutions of the other sheet, unwinding the sheets from the roll and separating the sheets, combining the sheets together into stencil frames, and providing substantially equal lengths of the separate sheets 8. .The method of making stencils havingV between the roll and the combining position i so that the portions of the sheets that were in confronting relation in the roll are combined together in the frames.

9. That step in the method Vof maln'ng -stencil frames composed of adhesively aixed superim osed paier sheets so that the frames are free om ten ency to warp,which method consists in winding together into roll form l long lengths ofthe sheets that comprise the frame so that the convolutions of one sheet are within the convolutions of the other sheet; 'and storing the roll for a sucient period of ist '- i the rou for a sufacfnt period o f4 e fletsoa time v:for the hyg'r'oscopiwc condition of confronting convolutions of the two sheets to become stable.

10. The method of making stencil frames 5 composed of adhesively aixed superimposed v paper sheets so that the frames are free from tendency to warp, which method consists in windin together into roll form long lengths of the s eets that comprsethe frame* so that im the convolutions of one sheet are within the convolutions ofthe other sheet and storing f time for the hyprosc'opic 'condition of confronting con, volutions of the two sheets to become stable 15 and=withd`rawing` the sheets from the roll and ladhesively aiixing them together in the same relative relation with each other that they had .intherollr' Y 11. The 'method of-making stencil frames i "f90 composed of adhesively 'axed superimposed A paper sheetsI so that the frames arefreefrom tendency towarp, which method consists in Eroviding long paper sheets, having the same ygroscopic condition at the same distances 525 from the ends thereof, and-adhesively afiixing the sheets together with the portions of the sheets having thesame hygroscopic conditions in registration. k '12. The method' of making stencil-frames im composed ofadhesively aiiixed superimposed v paper sheets so that the frames are free from tendencyfto warp, which method consists `in providing long sections of a wide and a narrow paper' sheet that have the same hygro- -135 scopic conditionsat the same distancesl from the ends thereof; blanking'windows in the Wide sheet -alongf the lengththereof and on opposite sides sof the median line thereof, combining the sheets by folding the wide 4 sheet along'its median line over'and against opposite sides of the narrow sheet, and positioning the two sheets with respect to each other so that when they are combined those portions of the two sheets having the same hygroscopic conditions 4are in registration with each other..

In testimony whereof, I have signed my name to this specification. 50- HARMON P. ELLIOTT.

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