US2035201A - Web registering and cutting device - Google Patents

Description

March 24, 1936. T HAL 2,035,201 v WEB REGIS TERING AN D CUTTING DEVICE Filed April 21, 1935 t 4 Sheets-Sheet l INVENTORS v ZD/m Z.J/I/f// Zm ofimwoFCm/mcx *ZMATTORNEYS. i

. E. 1.] SMITH 1:: AL 2,035,201

WEB REGISTERING AND CUTTING DEVICE 4 Sheets-Sheet 2 Filed April 21, 1935 March 24, 1936. E 5 5 Er A 2,035,201

WEB REGISTERING AND CUTTING DEVICE Filed April 21, 1953 4 Sheets-Sheet 3 INVENTORS flmm Z. J/v/rfl M0 152mm [Gk/max 6% #IMA TTORNEYS.

March 24, 1936. I E. L. SMITH El' AL I 2,035,201

WEiB REGISTERING AND CUTTING DEVICE Filed April 21, 1933 4 SheetS-Sheet 4 W 9 6.? $3 Ems? J/v/r/i j 21022145480 EQ/F/YflC/K removed from their order as that given Patented Mar. 24, 1936" 2.035.201 WEB nsors'rmmo AND corms. nnvrcn Elmer L. Smith. Longmeadow, and Edward F.

Cornock, Springfield, Mass.I nsdgnorl to Package Machinery Company, Springfield. Mala, a corporation of Massachusetts Application April :1, 193:, Serial No. 681.248 15 Claims. (Cl. ail-2.81

This invention relates to mechanism for registering and cutting printed webs of paper so that the line of severance will be located in prope relation to the printing appearing on the web. One object of the invention is to provide an improved mechanism of this type which is adapted for usewhere it is desired to forward the web continuously instead of intermittently. A further object is to improve the m for determining the condition of register of the web. A further object is to improve the mounting and shielding for the electric eye or photoelectric cell which is employed as a web scanning device. A further obiect is to improve the accuracy'of existing devices of this character, especially with relation to high rates of web feed. A further object is to provide'the mechanical structure by which the desired corrections are introduced into the web feed; A further object is to provide improved means for adjusting the reaisteringyfeeding, and cutting mechanisms. Additional objects will appear from the following description and claims.

Referring to the drawings:

Fig.1isasideelevationofamachineconstructed in accordance with my invention:

Fig. 2 is a detail section through the stationaryandmovablecuttingmembers:

Fig. 3 is an elevation,'loohing from the left in Fig.1,somepartsbeingbrokenawayandthe light source for the photoelectric cell being removed;

Hg. 4 is a sectional plan view. taken online 4-4 of Fig. 1:

Fig. 5 is asectional elevation, taken on line' 6-5 of Fig. 1: v

Fig.6isadetailplanonlineHoiFig.3, with the housing and shield for photoelectric cell shown in median section:

Fig. '1 is a section on line 1-1 of Fig. 6:

Fig. 8isaseetiononline8-8ofFig.3;

Fig. 9 is a fragmentary view similar-to a pertionofFig. 1 but showingthepartsinditferent positions:

Fig.l0isaticviewshowingcer-" tain e1 tricsl connections;

Fig. 11 is a =1 viewsimiiartoa P rtion of Fig. but showing a different condition of web reaistration:

i s. 12, 18. 14 and 15 are details of mechanisms appearing in F18- 1. these mechanisms being common support in same by the arrang ment of the Fig. 18 is a top plan view of the stationary web cutting knife; Fig. 17 is a side view of the rotary knife:

Fig.18isanendviewoftherotaryknife.

The present device is adapted to operate upon a web 20 of paper or other material, this being supplied from a reel 2| iournaled upon brackets-IZ' which extend from the main frame 28. After leaving its reel the web 26 passes over the usual slack take-up roll 24 mounted for swinging movement upon arms 25 pivoted to the frameatflandmgedinacountezclockwise directionasviewedinrig. lbyanysuitable .spring mechanism. The web then passes a guide roll I! mounted for rotation upon a tie rod 18, by which means the web is directed in a constantangulardirectiontotheguide28that positions it for the scanning operation of the photo-electric cell or electric eye 80. This guide It extends partway only acres the web andisarcuateincrosssection. Atoneendthe guldellissecuredbyscrewstl (Fig.3) toa cylindrical housing 82 (Fig. 6) formed at one side of a yoke-shaped bracket 83 which in him isseeuredbyasetscrewlltostierodfl. Attheotherendtheguideisslottedat 38 (1 =lg.8)screws8lpassingthroughtheseslots being. threaded intoabracket I8. Byflzismeans theguidemaybeshiitedinwith any lateral adjustment of the photo-electric cellwhichmaybenecessarytobring theiatter intolinewiththespots orregisteringmarirson the web. The detailed construction of the belplume-electric cell mounting will be considered 'Ihewebtm'ns throughananglenround the guide 28. and-then passes between upper and lower feed rolls IO and 4! respectively. The lower roll is preferably of steel. and the upper one made of cork and in the formof a longitudinallyspacedseriesofshortrolls, asshown in Fig.8. The two rolls are geared together by pinions-fl and It. the drive being through the lower roll as will be explained. Situated beyond the feed rolls are a stationary lower knife 48 and a revolving upper knife 48. Finally, the severedsheetisseisedbetweenfeedbeltsll and 48 which may form a part of-a sheet forwarding m It will be convenient before taking up the web controlling mechanism to consider the driving'mechanism'for the feed rolls. it being thro zhthisdrivingmechanismthatcontrolof the registration of theweb is accomplished. At

2 one end the shaft 49 bearing the lower feed roll 4I is extended through the frame and at mechanism to be described, turning the sleeve at the same constant rate. The outer end of the sleeve is formed with a pinion 6| meshing with a series of differential pinions 52 freely mounted upon the studs 55. A second series of differential pinions 63 are formed integral with those of the first series, and are of somewhat larger size. These latter pinions mesh with the pinion on the end of shaft 49. It will be seen that if the housing 53 is held stationary the gear 59 will, through the pinicns GI, 62, I53, and 5|, cause the shaft 49 to turn in the same direction and at a constant relative speed de-- pendent upon the number of teeth on the several gears. If the housing is given a bodily rotation the diiference'in the sizes of the pinions 62 and 63 will cause a relative advance or retardation of the shaft 49 depending upon the direction in which the housing is moved. In the present casethe housingis rotated in one direction only, the feed rolls being set to feed a length of ,web over or under the correct length and the housing being rotated periodically in a single direction with a frequency dependent upo the degree of correction required.

Rotation of the housing is obtained by a ratchet and pawl mechanism receiving its power from the main drive and controlled in its operation by the photo-electric cell which scans the web. The mechanical features of this ratchet device will be considered first. Projecting from the machine frame is a non rotating stud (Figs. 1, 5, and 9), which may be formed from the end of one of the tie bars which hold the frame assembled. A series of mechanisms illustrated in figs. 12, 13, 14 and are mounted on the stud I0, those figures showing the order in which said mechanisms are placed from the outer end of the stud inwardly. The outermost one of these elements (Fig. 12) comprises a pawl H pivoted at 12 to an arm I3 pinned to the stud so that it does not rotate.- A spring I4 presses on the pawl to hold it against a ratchet I5 which is free on the shaft and has fixed to it (Fig. 5) a gear IS in mesh with a gear 11 on the housing 53. The pawl 1| serves as a holdback to prevent movement of the ratchet.- and consequently of the housing, in a backward direction.

Tothe rear of the ratchet an arm 18(Fig. 13)

r is freely movable on the shaft. One end of this arm is provided with an areuate slot I9 in which an adjustable pivot 00 is clamped by a nut II (Fig. 1). Alink 82101115 this pivot with acrankpinflcarriedbyayokellclmnpedby a bolt I5 upon the end of a rotating shaft 08.

A sprocket 81 on thisshaft is connected by a chain 80 with a sprocket 09 on a drive shaft-90, which may conveniently be a part of the wrapping machine or other mechanism to which the paper feed is applied, so that the shaft 96 is driven continuously at a constant rate. The

other end or the arm 18 is provided with a pivot II for a pawl 92 held against the ratchet 15 by A gear 59 is keyed to the. sleeve 51 and is rotated at constant speed by a. spring 93 and having a tail 94 by which the pawl may be held out of contact with the ratchet.

Situated still further to the rear on the stud I0 is a member 95 (Fig. 14). free on the stud and constantly urged in a clockwise direction (as viewed in Fig. 14) by a spring 96 coupled between an arm 91 and a clip 98 (Fig. 1) on the frame. A second arm 99 on the member 95 bears an abutment I00 which, when the spring 96 is left free to act, rests constantly against the pawl tail 94 and keeps the pawl out of contact with its ratchet. A third arm MI is slotted to receive a sliding dog I02 guided by a pin I03 and pressed outwardly by a spring I04. This dog is adapted for engagement with a hook I05 (Fig. 15) carried on a bell crank I06 pivoted at I01 to the endof an arm I08 fixed against rotation on the stud I0. On the other end of the bell crank is an adjustable abutment in the form of a screw I09 held in place by a lock nut 0. This screw is positioned so as to be contacted with by a finger III projecting from in the circuit controlled by the photo-electric cell.

Whenever a current is established in the elec tro-magnet by the photo-electric cell the finger III will act on the bell crank to swing the hook I05 into the path of the dog I02. In accordance with the present invention the closure of the circuit through-the magnet is not critical in its timing, since this circuit is arranged to remain closed for a considerable part of the cycle. Provided that the circuit through the magnet is closed during the inactive or counterclockwise rotation of the pawl arm and remains closed until the pawl starts its active or clockwise movement the action will be the same. In any case the sole direct function of the magnet is to tilt the hook into the path of the dog I02, an operation requiring little expenditure of power as the bell crank maybe made nearly evenly balanced. If the dog has not by that time passed the hook in its inactive stroke it is permitted by its spring to ride over it, and when the pawl carrier starts its clockwise motion the dog will be caught behind the hook as in Fig. 9 and prevented from further motion. It will be understood that except when the hook is shifted into this position the spring 96 will keep the abutment I00 against the tall 94 of the pawl and the members 18 and 95 will move as a unit with the pawl held out of engagement with the ratchet. When the hook holds the member 95 against movement, however, theabutment- I00.can no longer restrain the pawl: and in that case the ratchet is engaged by the pawl and is rotated to cause a corresponding rotation of the housing 63 and therefore a correction in the angular position of the feed rolls. The correction applied is constant and predetermined in amount and is always in a single direction, the amount of correction given to the rolls being governed by varying the frequency rather than the magnitudes of individual corrections.

The electro-magnet is controlled by a photoelectric cell 30. which is mounted and shielded in a novel manner forming an important part of my invention. The tube is held on a standard socket I20 (Fig. 6) located in the cylindrical housing 32 which is formed as a part of the bracket 33. A shield I2I, having an aperture I22- at one point for the admission of light. is screwed at I23 to the housing and preferably,

. 2,085,201 l bearsal spring in which holds the tube yieldingly in position. The tube is thus fully prohte'cted against light coming from any direction eiccept through the aperture I22. Surrounding J the shield I2I is a rotating shutter I25 secured on the end of a shaft I26 journaled in the second arm of the bracket 23. This shutter has a narrow slit I21 which passes across the aperture I22 at each revolution of the shutter, permitting the entrance of light from a light source I26 unless the slit is closed by the registration with it of an opaque spot I28 printed upon the web 20. As is customary in light sources for use with photo-electric cells, a focusing lens I36 is provided to cause the light beam I3I to converge upon tlie cell, and the source is adjustable as at I32 in order to allow for accurate focusing.

The shutter I is mounted for rotation onceduring each cycle, being timed in the case shown so that the lit I21 passes the aperture I22 at the same tant as a spot I29 if the web is in accurate registration. The machine is intended to sever sheets of variable lengths, so that the distance between successive spots on the web .will vary for eachlength of sheet. One sheet length must be pulled past the photo-electric cell in each cycle, while the shutter makes a single revolution. The web will accordingly slip over the shutter an amount equal to the excess of the sheet length over the circumference of the shutter. It is desirable not to have the slippage occurringat a time when the spot is passing the aperture I22, as this might cause the.

light beam reaching the cell to pass onto or on from the spot during the transit of the spot across the aperture, with a consequent disturb-' ance of the action of the. cell. Provision has therefore been made for driving the shutter at a variable speed, so that the effective portion.

of the 11am beam may be synchronized with the web at the instant of transit. For this purpose the shaft I26 is provided with an elliptical gear 135 adjustably held to the shaft by a split hub I36 and a clamp screw I31 (Fig. 3). A second elliptical gear I66 meshes with the first one and is held by a split hub I19 and a clamp screw I40 to the shaft 66 carrying the ratchet operating crank. By adiustingthese gears relatively to the shutter the speed of the latter at the time of transit may be controlled so that it is the same as that of the web.

In order to-vary the amount of rotation given tothe web feed rolls during each cycle, and thereby to control thelength of sheet cut. a change speed gearing is provided for driving the lower feed roll I. It will be recalled that 'the drive for this roll was obtained from a gear 56 acting through the differential gearing described in connection with the feed correcting mechanism. This gear-meshes with a gear I46 roing cylinder I BI which has reduced ends journaled in the frame. The knife blade is beveled of! at I62 with its flat side facing against the direction of movement of the web, and is provided with a slight additional bevel I63 (Fig. 18) on the flat side, this bevel increasing progressivelyfrom one end of the bi e to the other. The knife is ground so that i cutting edge is always at the same radial distance from the axis around which it rotates, but is displaced angularly around this axis so that it generally corresponds to the angular arrangement of the stationary knife. Because of this construction the knives coact to produce .a shearing cut, starting at one side of the web and proceeding in an angular direction across the machine, this angle being chosen so that the resultant cut across the moving web is substantially straight and at right angles to the web edges. It is preferable that the knives move at a much higherspeed than the web during the instant f cut, and'an elliptical gear drive is provided generally similar to that used in driving the shutter, to, raise the cutter speed at this point in the cycle. The upper cutter shaft has one elliptical gear I65 pinned to it, its angular position being chosen so that when the cutting blades are in contact the highest speed is being delivered to the upper blade. This gear is in mesh with a second gear I66 held'by a split hub I61 and a binding screw I66 onto the main driving shaft I56 previously referred to. By this adjustment the knives may be set in proper relation to the machine to which the cut sheets are delivered. v v

The amplifying relay which is controlled by the'photoelectric cell is not illustrated in detail as in itself it forms no part of my invention.

Preferably a thermionic relay is used, as this is at once more sensitive and more rapid in re sponse than a mechanical relay. Preferably, also, the relay comprises a mercury vapor cut.- put tube of the so-called thyratron type supplied with direct current through a suitable rectifier circuit if necessary. A tube of this type, when supplied with direct current in its plate circuit, has the characteristic of being easily and rapidly rendered conductive by a momentary excitation of its grid circuit, and retaining this conductivity independently of any grid excitation until the plate circuit is broken positively. Furthermore, it is desirable that the photo-electric cell be connected in a manner to give current in the output circuit of the amplitier when light falls upon the cell. Photo-electric amplifiers having these characteristics may be obtained in commercial form upon the market and need not be described in all their electrical details here. Of com-se certain mechanical features of the invention are usable with amplifiers and the apparatus could in some aspects be adapted to such other forms. The preferred type of amplifier has definite advantages when used in combination with the mechanism described, as will now be more particularly pointed out. 1

as was mentioned above. it is preferred to use an amplifier the output circuit of which is energiaed by light striking the photo-electric cell, but which is not d by the cessation oftbislight. 'lhishastheadvantageofrequiring only a very brief duration of illumination while leaving the output circuit closed for a sufilcient time to actuate the necessary mechemical parts without sensitive and critical ad ,iustment. In Fig. 10 the cell 30 is shown as coupled by a circuit I10 to an amplifier comprising a rectifier tube I1l receiving current from an alternating current supply I12 and changing this into direct current; a thermionic amplifier tube I13, and a vapor type output tube I14. The output circuit from this tube is indicated at I15 and passes throughthe coil of the electro-magnet H3 and through contact members 116 and I11. Member IlSis carried upon an arm I18 shown diagrammatically in Fig. 10 and in detail in Fig. 8. The arm is pivoted to the frame at I19 and bears a cam roll I pressed by a spring IBI against a cam I 82 fixed to the shaft 86. Normally the members I16 and I11 are in contact, but are separated once during each cycle to break the current through the magnet previously established by the thyratron tube.

The operation of the device will now be described. During the main part of the web i'eeding cycle the feed rolls operate in the usual manner at a constant rate of feed. Due to the fact that the mechanism can correct in one direction only it is necessary to bias the feed in such a manner that even when a web having a normal length between spots is being fed a correction will be called for periodically. with the device thus set, (in this case by means of the replaceable gears'driving the feed rolls) variation in the spacing of the spots on the web .due to atmospheric or other causes will change the frequency of the corrections applied by means of the ratchet mechanism but not their magnitude. The timing of the device is such that if a spot arrives over the aperture I22 at the same time as the slit I21 no light reaches the photo-electric cell and no correction is made. If the spot does not cover the aperture light will fall on the cell and a correction will occur. Due to the bias given to the feed rolls, however the spot does not miss the slit except in one direction unless in' the slit I21. Under these conditions, which represent accurate registration of the web, no current pases in the output circuit of the amplifier. The electro-magnet II! is accordingly not energized and the hook I05 is not raised. This leaves the member free to rotate under the influence of the spring 86 in one direction and the pawl carrier 18 in the other, abutment IIiIi resting continuously against the tail of the pawl H and keeping it out of contact with the ratchet 15. No correction therefore occurs. If the spot is displaced forwardly of the slit I21 by a contraction of the web, light from the source I28 will reach the photo-electric cell and will cause current to flow through the magnet-I I3. This will occurwhen the pawl is moving in its inactive sroke, counterclockwise as viewed in Fig. 13,

-the exact instant being unimportant. This independence of the correcting mechanism from the timing of the web scanning device is of con- 'siderable value as it permits much freer adjustment of the machine for producing sheets of difi'erent lengths, and is made possible by the use of an amplifier or relay of the standard type which delivers a persisting output current when it is once activated. The resetting cam I82 is timed to break the output circuit after the pawl has started its power or clockwise stroke, and

- hence after the member 85 has been retained by the hook I05 if it is going to be. Instead of having operation of ratchet 15 occur whenever connection is required, it would of course be possible to adjust the normal feed of the web and the operation of the magnet so that the ratchet would be operated whenever a spot was in proper position, and would. be inactive to cause a correction when a spot was cute! register.

What we claim is:

1. In a web handling device of the type controlled by the coaction of indicia on the web with a detecting device. that construction of detecting device comprising a light source, a stationary photo-electric cell, a cylindrical shield surrounding the cell and having a light-admitting slit therein, means for forwarding the web along a path in contact with said shield and between it and the light source, and means for rotating the shield around the photo-electric cell and upon an axis extending transversely of the path of motion of the web and at a surface speed sub-- stantially corresponding with that of the web as the slit makes contact with the web.

2. In a web handling device of the type controlled by the coaction of indicia on the web with a detecting device, that construction of detecting device comprising a light source, a photoelectric cell, an apertured guard surrounding the cell, a cylindrical shield surrounding the guard and having alight-admitting slit therein, means for guiding a web past the shield with the indicia thereon in line with, the aperture, and means forrotating the shield around both the cell and the guard upon an axis extending transverseLv of the path of motion of the web.

3. In a web handling device of the type controlled by the coaction of indicia on the web with a detecting device, that construction of detecting device comprising a light source, a photoelectric cell, a shield surrounding the cell and having a light-admitting slit therein. said shield being mounted for rotation in surface contact with the web, means for rotating the shield with a variable angular velocity, and means for adlusting said rotating means so that the angular velocity at the instant of registration of the indicia with the slit may be made such that the surface speeds of the shield is momentarily the same as the surface'speed of the web.

4. In a web handling device of the type in gears adiustably mounted so that the peripheral speed of the shield when the slit makes contact with'the' web may be made the same as the linear speed of the web being delivered by the feed rolls.

5. In a web handling device of the type controlled. by the coaction of indicia on the web with a detecting device and-adjustable to handle varying lengths of web in a'single cycle. that construction of detecting device comprising a light source. a photo-electric cell positioned to receive light from the source after said flight contacts the web. a shutter positioned to intercept the light from said som-ce, means for moving the shutter at a variable speed, and means for adjusting the speed of the shutter so that the light beam reaching the cell is, at the line of the web traveling at the same speed as the web.

6. In mechanism for controlling theregister of an indicia bearing web relative to a web treating machine, having web feeding rolls, a three part differential drive for said rolls having one part connected to the feed rolls, a second part connected to a continuous drive, and a third part adapted for progressive movement to control the timing of the rolls; mechanism for causing progressive movement of said third part comprising a ratchet coupled to said third part,

a pawl, means for oscillating the pawl, and

means controlled by the register of the web and operable during the continuous motion of the plying to said third part during the continuous motion of the second part a succession of angular rotations of predetermined and equal amounts, and means responsive to the condition of register of the web for varying the 'frequency of application of said rotations.

8. In mechanism for controlling the register of an indicia bearing web relative to a web treating machine, having web feeding rol1s,'a three part diiferential drive for said rolls having one part connected to the feed rolls, a second part connected to a continuous drive, and a third partadapted for movement to control the timing of the rolls; mechanism for causing progressive movement of said third part during the continuous motion of the second part comprising a ratchet coupled to said third part,

,a pawl, means for oscillating the pawl, a follower riormally held against the pawl to hold the pawl out of contact with the ratchet, and means controlled by the register of the web for holding said follower out of contact with the pawl during a power stroke.

9. In mechanism for controlling the register of an indicia bearing web relative to a web treating machine, having web feeding rolls, a three part differential drive for saidrolls having one part connected to the feed rolls, a

' when energized it will shift. saidhook into a position to engage the follower, and means controlled by the register of the web for energizing the electro-magnet, A

10. In mechanism for controlling the register' of an indicia bearing web relative to a web treating machine, having web feeding rolls, a three part differential drive for said rolls having one part connected to the feed-rolls, a. second part connected to a constant speed drive, and athird part adapted for movement to control the timing of the rolls; mechanism for moving said third part comprising a ratchet coupled to said third part, a pawl, means for oscillating the pawl, a follower normally held against the pawl to hold the pawl out of contact with theratchet, a balanced hook adapted to be swung to engage the follower and prevent it from following the pawl during a power stroke, an electro-magnet positioned so that when energized it will shift said hook into a position to engage the follower, a photo-electric cell positioned to be affected by indicia on the web, an ampliier connecting said cell to the electromagnet and of a type such that momentary excitation of the cell will cause a persisting current through the electromagnet, means for timing the operation of the cell with the passage of the web so that deviations in registry will produce activation of the cell during the inactive stroke of the pawl, and means for breaking the current through the electromaget during the power stroke of the pawl.

11. In a web handling device controlled by the coaction of indicia on the web with a detecting device, means for feeding the web, a

ratchet, means connected to the ratchet for introducing a correctioninto said web feeding means, an oscillating pawl, means operative at adefinite point in the cycle approximating the 7 beginning of the power stroke of the pawl for ratchet, means connected to the ratchet for introducing a correction into said feeding web feeding means, a positively operated pawlcarrier, a pawl on the carrier coacting with the ratchet, a follower spring-held against the pawl for normal travel therewith and operable when so held to hold the pawl out of contact with the ratchet, and means responsive to the registry of the web for holding the follower from travelling withv the pawl during a power stroke,

of the pawl carrier.

13. In a web handling device of the type controlled by'the coaction of indicia on the web with a detecting device, that construction of detecting device comprising a light source, a photoelectric cell, a cylindrical shield surrounding the cell mounted on an axis transverse to the path of travel of the web, and having a light-admitting slit therein, a guard plate preventing undesired light from reaching the cell and having a light admitting slit with which the slit in the shield aligns during its rotation, means for forwarding the web with the indicia thereon passing between the light source and the aligned slits, and means for rotating the shield uponits axis.

14. In a web handling device of the type controlled by the coaction of indicia on the web with a detecting device, that construction of detecting device comprising a light source, a photo- II rotating the shield upon its axis.

15. In a. web handling device of the type controlled by the coaction of indicia on the web with a detecting device, that construction 01 detecting device comprising. a light source, a photoelectric cell, a cylindrical shield surrounding the cell, mounted on an axisv transverse to the path 01 travel of the web, and having a light admitting slit therein, means for preventing light ialling on the cell from affecting its controlling action except during a predetermined part of the cycle of the device, means for forwarding the web with an uninterrupted motion during the detecting action of the device and in a path between the light source and the shield with the indicia in alignment with the light admitting slit in the shield, and means for rotating the shield upon its axis with a surface speed substantially the same as that of the web at the time when the indicia on the web, comes into registration with the light admitting slit in the shield.

EIMER L. SMITH. EDWARD F. CORNOCK.

CERTIFICATE or CORRECTION;

Patent No. 2,035,201, March 24, 1936;

ELMER L; SMITH, ET AL.

It is hereby certified that error; appears in the printed specification of the above numbered patent requiring correction as follows: Page 4, first column, line 63, for "sroke read stroke; and second column, line 48, claim 5, for "speeds" read speed; page 5, first column, line 4, claim 5, after "web" first occurrence, insert a comma; and second column, line 47, claim 12. I strike out the word- "feeding"; 'and that the said Letters Patent should be I read with these corrections therein that the same may conform tothe record of the case in the Patent Office. v

Signed and sealed this 28th day of April A. D. 1936.

(Seal) Leslie Frazer Acting Commissioner of Patents I rotating the shield upon its axis.

15. In a. web handling device of the type controlled by the coaction of indicia on the web with a detecting device, that construction 01 detecting device comprising. a light source, a photoelectric cell, a cylindrical shield surrounding the cell, mounted on an axisv transverse to the path 01 travel of the web, and having a light admitting slit therein, means for preventing light ialling on the cell from affecting its controlling action except during a predetermined part of the cycle of the device, means for forwarding the web with an uninterrupted motion during the detecting action of the device and in a path between the light source and the shield with the indicia in alignment with the light admitting slit in the shield, and means for rotating the shield upon its axis with a surface speed substantially the same as that of the web at the time when the indicia on the web, comes into registration with the light admitting slit in the shield.

EIMER L. SMITH. EDWARD F. CORNOCK.

CERTIFICATE or CORRECTION;

Patent No. 2,035,201, March 24, 1936;

ELMER L; SMITH, ET AL.

It is hereby certified that error; appears in the printed specification of the above numbered patent requiring correction as follows: Page 4, first column, line 63, for "sroke read stroke; and second column, line 48, claim 5, for "speeds" read speed; page 5, first column, line 4, claim 5, after "web" first occurrence, insert a comma; and second column, line 47, claim 12. I strike out the word- "feeding"; 'and that the said Letters Patent should be I read with these corrections therein that the same may conform tothe record of the case in the Patent Office. v

Signed and sealed this 28th day of April A. D. 1936.

(Seal) Leslie Frazer Acting Commissioner of Patents I

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