US3526562A - Magnetically actuatable business machine card,method of making the same and apparatus therefor - Google Patents

Description

3,526,562 METHOD E. A. DAHL, JR

MAGNETICALLY ACTUATABLE BUSINESS MACHINE CARD,

OF MAKING THE SAME AND APPARATUS THEREFOR Filed Oct. 22, 1965 3 Sheets-Sheet 1 3,526,562 METHOD OF MAKING THE SAME AND APPARATUS THEREFOR Filed. 001;. 22, 1965 E. A. DAHL, JR

Sept. 1, 1970 MAGNETICALLY ACTUATABLE BUSINESS MACHINE CARD,

3 Sheets-Sheet 2 j i dzja J2 J 5%,), flwws l l l I Sept. 1, 1970 H JR 3,526,562

MAGNETICALLY ACTUATABLE BUSINESS MACHINE CARD, METHOD OF MAKING THE SAME AND APPARATUS THEREFOR Filed Oct. 22, 1955 3 Sheets-Sheet 3 United States Patent Oflice 3,526,562 Patented Sept. 1, 1970 3,526,562 MAGNETICALLY ACTUATABLE BUSINESS MA- CHINE CARD, METHOD OF MAKING THE SAME AND APPARATUS THEREFOR Ernest A. Dahl, Jr., 729 Greenwood Ave., Wilmette, Ill. 60091 Int. Cl. C09j /04; B32b 31/10 US. Cl. 156519 14 Claims ABSTRACT OF THE DISCLOSURE Apparatus and method for making business machine cards provide for delivering a pair of first webs toward a laminating station with the longitudinal axes thereof disposed parallel and sandwiching a space therebetween. A sequence of discrete card elements is delivered into that space; and the webs and card elements are then bonded into a unified web. As individual business machine cards are required, they are severed from this resultant web.

This invention relates generally to the manufacture of business machine cards and more particularly to business machine cards of the magnetically actuatable type.

Both paper and paperboard are conventionally manufactured by continuous process; and whether Fourdrinier or cylinder machines are used, some orientation of the pulp fibers occurs, giving the product a grain, that is, an axis of physical property orientation. As a further result of the continuous nature of the manufacturing procedures, the freshly made paper or paperboard is impressed with a curvature imparted by the cylinder or reel upon which it is wound for collection, storage and handling. This curvature may be transient or semi-permanent depending upon a number of factors including the thickness and wetness of the stock and the diameter of the winding reel. In any event, situations exist in the business card industry which point out the desirability of having a card that approaches an isotropic character.

Therefore, a general object of the present invention is to provide a new and improved business machine card, a method of making the same and apparatus therefor.

Another object of the invention is to provide a magnetically actuatable, business machine card of stable fiatness.

Still another object of the invention is to provide a multi-ply, business machine card having the grain of the respective laminae disposed in relative right angular relationship.

And still another object of the invention is to provide substantially isotropic business machine cards in a continuous roll form.

A further object of the invention is to provide an economical method of making magnetically actuatable, business machine cards from a plurality of webs.

A yet further object of the invention is to provide apparatus for manufacturing interconnected business machine cards in which the cards are of laminated construction with the laminae disposed in relative right angular relationship and in which the inner laminae have substantally no spaces between them lengthwise of the train of cards.

These and other objects and features of the invention will become more apparent from a consideration of the following descriptions.

A method of making a business machine card in accord with the invention includes the steps of providing a pair of first webs and delivering these webs toward a laminating station with the longitudinal axes thereof disposed parallel. These first webs are delivered toward the laminating station sandwiching a space therebetween, and

a sequence of discrete card elements are delivered into that space. Subsequently, the webs and the card elements are bonded into a unified web; and when individual business machine cards are desired, they are severed from the resultant web.

In order that the principles of the invention may be readily understood, reference now will be had to the accompanying drawings and the following disclosure. In the drawings:

FIG. 1 is a schematic perspective view of manufacturing apparatus embodying the principles of the invention and operative in compliance with the method aspects thereof;

FIG. 2 is an enlarged, elevational view taken substantially along the line 2-2. of FIG. 1;

FIG. '3 is an enlarged, top plan view taken substantially along the line 3-3 of FIG. 1;

FIG. 4 is an enlarged perspective view of that portion of the apparatus of FIG. 1 wherein discrete card elements are delivered to a station where their direction of movement is altered;

FIG. 5 is a schematic plan view on a reduced scale showing two sequential card elements being delivered in line for transfer;

FIG. -6 is a view similar to the showing of FIG. 5 but illustrating the first card in the sequence being altered in its path of movement;

FIG. 7 is a view similar to the showings of FIGS. 5 and 6 but illustrating a subsequent stage in the directional transfer;

FIG. 8 is an enlarged, side elevational view of the intermittently engaging drive rollers used in efi'ectuating transfer in the direction of movement of the card elements, the drive rollers being shown engaging a card element for accelerating the same into the path of movement of the webs of outer lamination material;

FIG. 9 is a view similar to the showing of FIG. 8 but illustrating the intermittently engaging rollers in their spaced condition for admitting overlapping card elements therebetween;

FIG. 10 is an enlarged, elevational view taken substantially along the line 1010 of FIG. 1;

FIG. 11 is an enlarged, perspective view of the punching and perforating rollers used to process the completed web;

FIG. 12 is an enlarged, cross-sectional view taken substantially along the line 12-12 of FIG. 11 and showing the makeup of the finished web; and

FIG. 13 is a perspective view of a finished business machine card produced in compliance with the invention.

Referring now in detail to the drawings, specifically to FIG. 1, apparatus for making a business machine card in accord with the invention is indicated generally by the reference numeral 20. The apparatus 20 broadly includes a lateral drive 22, a transfer drive 24 and a forward drive 26.

The apparatus 20 is arranged to manufacture business machine cards from a number of continuous sheets or webs comprising paper of other non-magnetic material and a pair of continuous strips comprising steel foil approximately 0.002 inch thick, for example, or other magnetic material. Consequently, a roll 28 of suitable paper card stock is provided as a supply for the lateral drive 22, roll 28 delivering a substantially continuous web 30 of inner ply material. Similarly, a pair of vertically spaced rolls 32 and 34 supply respective webs 36 and 38 of suitable outer ply material to the forward drive 26. The webs 30, 36 and 38 are comparatively wide; and in order to produce a card of the type contemplated by the present invention, relatively narrow webs of both non-magnetic and magnetic materials are also required. Specifically, laterally spaced rolls 40 and 42 supply parallel respective webs 44 and 46 of comparatively narrow, magnetic parallel webs 52 and 54 of comparatively narrow non-magnetic material to the same work operation. Advantageously, the rolls 40 and 42 and the rolls 48 and 50 are situated respectively above and below the central plane of the forward drive 26. It is to be understood that the aforementioned rolls are mounted for rotation in suitable journals, not shown.

In compliance with the principles of the invention, the webs 36 and 38 of outer ply material are delivered to the forward drive with their longitudinal axes disposed substantially parallel. Cooperatively, the comparatively narrow webs 44, 46, 52 and 54 are likewise delivered with their longitudinal axes parallel to the longitudinal axes of the webs 36 and 38. However and in compliance with the invention, the web 30 of inner ply material is situated with its longitudinal axis disposed at an angle, specifically a right angle, to the axes of the other webs. In addition, the web 30 of inner ply material is severed into a sequence of discrete card elements, and these card elements are supplied to the transfer drive 24 rather than the continuous material of web 30.

Continuing with reference to FIG. 1 and with supplementary reference to FIGS. 2 and 3, the lateral drive 22 comprises a pair of freely rotatable idler rollers 56 and 58 which establish a path from the supply roll 28 to longitudinally spaced pairs of suitably powered feed or drive rolls 60 and 62. The rolls 60 and 62 are rotated to drive web 30 in the general direction of arrow 64 and toward the transfer drive 24. In addition, the rolls 60 and 62 are spaced apart longitudinally of the axis of web 30 to admit a cooperating pair of cutter rolls 66 and 68 therebetween. In order to sever the web 30 at the desired, predetermined intervals, a blade or knife 70 is raised from the surface of cutter roll 66 and a cooperating anvil 72 is mounted in the roll 68 for the knife 70 to out against. This arrangement of the rolls 66 and 68 is best best shown in FIG. 2; and while a single blade and cooperating anvil has been illustrated, it is recognized that rolls of larger diameter carrying several, peripherally spaced cutter blades may be employed. The interval or spacing of such multiple cutter blades, as determined by the circumference of the corresponding roll, is arranged to be a distance or spacing that is equal to the overall width of the card being produced less the combined width of the comparatively narrow strips. Thus, the circumferential spacing or cutting interval of the blades 70 determines the width dimension of the severed card element as measured in the direction of the longitudinal axis of the web 30. J

The lateral drive 22 also comprises a final feed roller unit 74 and a depression roller unit 76. In addition, a transverse bar 78 is disposed across the path of travel of the card elements that emanate from the final feed roller 74, the roller unit 74 being situated relative to the bar 78 in proper position to preserve frictional contact with the card elements severed by the rolls 66 and 68 for the maximum possible travel toward the bar 78. Unit 74 is thus positioned to release each card element at the time just before it engages the bar 78. In order to achieve the desired positioning of the roller unit 74, the upper component of this unit is divided into a number of axially spaced roller elements 80, as is well shown in FIG. 3. The depression roller unit 76 is similarly composed of axially spaced roller elements 82, and the elements 80 are interspersed 'with the elements 82. The final feed roller unit 74 also includes a single, elongated roller 84 which is positioned in opposed relationship relative to its roller elements 80, as is shown in FIG. 2.

During the time that a leading card element of a sequential pair of such elements is executing a transfer movement, overlapping with the immediately trailing card element is contemplated. In order to initiate the overlap of leading and trailing elements of a sequential pair, each of the roller elements 82 in the depression roller unit 76 is provided with a radially outward extending lobe 86, well shown in FIGS. 2 and 4. The lobes 86 of the roller elements 82 are aligned laterally to strike and depress an underlying card element substantially simultaneously. Continuing with reference to FIG. 4, the lobe elements 86 are seen acting to depress the trailing edge of a leading card element 88 whereby to permit the advancing forward edge of a subsequent card element 90 to overlap as the leading card element 88 is arrested in its motion by contact with the bar 78. It is recognized that the depression roller unit 76 could be replaced with a vertically reciprocal foot or like element.

For purposes of confining the card element against substantial vertical dislocation in the vicinity of transfer drive 24, the lateral drive 22 incorporates parallel guide plates 92 and 94 that are disposed between the depression roller unit 76 and the transverse bar 78. As is best shown in FIG. 4, the guide plates 92 and 94 have respective lips 96 and 98 that open or diverge toward the depression roller unit 76 whereby to direct card elements between the plates. In addition, each of the plates 92 and 94 is apertured to expose a sandwiched card ele ment to vertically aligned, high- spot rollers 100 and 102 which comprise elements of the transfer drive 24.

In the lateral drive 22, the drive rolls 60 and 62, the cutter rolls 66 and 68, the final feed roller unit 74 and the depression roller unit 76 are all supplied motive power in a manner that insures proper coordination of the various operations. In compliance with well known principles, an intermeshed gear drive may be employed for this purpose. Furthermore, the transit speed of the web 30 and the card elements cut therefrom, in the direction of arrow 64, is determined from the relative dimensions of the finished card and the transit speed in the forward drive 26. For example, the transit speed in lateral drive 22 bears an 8/5 ratio to the transit speed in the forward drive 26 when the finished business machine card is five inches high and the inserted, interlaminar card element is eight inches wide.

Once a card element has had its motion in the direction of arrow 64 arrested by the transverse bar 78, the high- spot rollers 100 and 102 are employed to engage and accelerate such a card element in the direction indicated in FIG. 3 by the arrow 104. As is shown in FIGS. 4, 8 and 9, each of the high- spot rollers 100 and 102 is provided with an axially extending high-spot or raised sector 106. In accord with the invention, the angular extent of the high-spots 106 corresponds in peripheral measure to the difference between the length of the highspot roller and the width of the card element, i.e. the difference between the length of the high-spot roller and the dimension of the card element lying in the direction of the arrow 64.

The length of the high spot rollers, on the other hand, is determined by a consideration of two factors. Highspot rollers of camparatively greater length provide greater holding power with respect to a card element gripped therebetween and hence reduce the tendency of the card to skew during transfer. However, the high- spot rollers 100 and 102 cannot take a length corresponding to the full width of a card element because it is necessary to permit an overlapping of sequential pairs of the card elements in the transfer station. This latter fact will be recognized from a consideration of the requirements for stopping and changing the direction of movement of the card elements. The low spot or region of the rollers 100 and 102 which is radially lesser in extent than the sectors 106 serves to admit a card element between the rollers before the card element is engaged and driven in the direction of arrow 104, i.e. in the forward direction. The low spots on the rollers 100 and 102 thus allows completion of the lateral movement of the card element.

In order to admit the high- spot rollers 100 and 102 into operative engagement, the guide plates 92 and 94 are fashioned with similar apertures 108 as is best shown FIGS. 4, 8 and 9.

. In one specific embodiment of the invention wherein production of a business machine card..five inches high and having a card element inserted eight. inches wide was contemplated, the radius of the high-spot sector has been usefullyselected to be /211 inches and the high-spot sector was advantageously selected to take an angular extent of 129 degrees. Correspondingly, the length of the high-spot roller was selected to be two-thirds of the width ofthe card felement insert or 5% inches. It is important to point outfthat the longitudinal dimension of the highspot roll and the angular extent of the high-spot sector are independent ofthe speeds of the lateral and forward drives although relatively dependent upon each other.

Turning to a' consideration of FIGS.,,1 and 10 for a description of the forward drive 26, a pair of vertically spaced card} element pickup rollers 110 and 112 are shownpositioned' close to the high- spot rollers 100 and 102 in order to engage and control a card element such as the card element 88 immediately upon the same being released by the high-spot sectors of the high-spot rollers. Advantageously, the pickup rollers 110 and 112 have the plane of their vertically aligned axes spaced processwise downstreamt'from the corresponding plane of the axes of rollers 100 and 102 by the peripheral extent of the highspot sectors 106. By placing the pickup rollers 110 and 112 close to the high-spot rollers, skewing of the card elements, upon frictional engagement of trailing and leading card elements in a sequential pair, is prevented. In' addition to the pickup rollers 110 and 112, the forward- -drive 26 includes a cooperating pair of powered laminating rollers 114, supplementary drive rollers 116 and' a' powered takeup roller or reel 118.

- Thelarn'iriating rollers 114 serve to combine the discrete card element such as the card element.88, the relatively wide webs'36 and 38 of non-magnetic material, the relatively- narrow webs 52 and 54 of non-magnetic material and the relatively narrow webs 44 and 46 of magnetic material into a composite sheet or laminate from which business machine cards may be severed. Inorder that the laminate thus formed may have the character of. permanence, a suitable adhesive is advantageously applied to the confronting surfaces of webs 36 and 38 when'considering the final product. For this purpose, upper and lower spray arrangements 120 and 122 are situated to dispense a suitable layer of adhesive onto the webs 36 and 38, as is shown in FIG. 10. These spray arrangements comprise elongated tubular elements fashioned with a horizontal line of spray orifices facing therespective web; and as will be seen in FIG. 1, the spray arrangements 120 and 122 are supplied by feed lines 124. i

'A series of idler rollers is employed in directing the various webs between the laminating rollers 114. An idler roller 126 is used with web 36, anidler roller 128 engagesithe web 38, an idler roller 130 directs the magnetic webs 44 and 46, and an idler roller 132 engages the comparatively narrow, nonmagnetic weps 52 and 54. In addit on, heat is advantageously employed in curing the adhesive applied in laminating the several webs. Accordingly, a heater unit 134 of the induction or other suitable type is situated flowpathwise subsequent to the laminating rollers 114 and generally between the rollers 114 and the supplementary drive rollers 116.

The finished web or continuous laminate which emerges from the supplementary drive rollers 116 is indicated by the reference numeral 136; and this element may be wound on the reel 118 or it may be directed to cutters for severing it into a plurality of individual business machine cards. However, it is advantageous to maintain the individual cards in interconnected form for subsequent pr nting and other operations while at the same time facilitating the separation of the individual cards from the remainder of the web. Accordingly, a pair of processing rollers 138 and 140 are located generally between the drive rollers 116 and the reel 118. If desired, one or more idler rollers 142 may be employed in controlling the path and direction of movement of the finished web 136.

Continuing with reference to FIG. 11 for a detailed description of the processing rollers 138 and 140, the upper roller 138 is shown to comprise a perforating and slitting roller made up of a crylindrical barrel or drum 144, a series of radially outwardly extending, tubular punches 146 located around the periphery of each end of the drum, and a pattern of peripherally aligned knives 148 and axially aligned knives .150. The punches 146 serve to perforate parallel lines of sprocket holes 152 in the web 136, and the knives 148 develop score lines or slits 154 parallel to the sprocket holes 152. cooperatively, the knives develop score lines or slits 156 and 158 across the width of the web 136 at intervals corresponding to the height of the final business machine card. The score lines or slits 156 and 158 are closely spaced apart and are positioned to contain the confronting edges of the card elements therebetween. Thus, in the event that slight skewing of the card elements results in gaps or in overlapping, these minor malpositions will reside in the discarded material lying between the slits or score lines .156 and 158. cooperatively, the longitudinal slits or score lines 154 insure even distribution of the inner ply material at the lateral edges of the finished card.

In order to cooperate with the roller 138 in developing the sprocket holes and slits or score lines in the finished web, the roller 140 is arranged to comprise a cylindrical barrel or drum 160 that is surfaced with a material which is soft enough to avoid seriously damaging the slitting knives 148 and 150 as they pass through the material of the web 136 and which is, at the same time, resilient enough to urge the web into incising engagement with the slitting knives. Additionally, the drum 140 is provided with two series of peripheral recesses 162; and each series of the recesses 162 is aligned radially and reg stered peripherally with a series of the punches 146 in roller 138. Moreover, the material of the opposite ends of the roller .140 in the vicinity of the recesses 162 is selected to be stiff enough to support the material of the web 136 against the entering edges of the punches 146 whereby to make clean sharp apertures in the web. This latter surfacing material may be but need not necessarily be the same material as that which is provided on the drum 138 in cooperative position with the slitting knives 148 and 150. As will be recognized, the slits or score lines 154, 156 and 158 readily permit a business machine card to be burst from the processed web 136 wh le the sprocket holes 152 permit the Web to be driven through a printer at high speed and in accurate registration.

In the forward drive 26, the pickup rollers 110 and .112, the laminating rollers 114, the supplementary drive rollers 116 and the processing rollers 138 and 140 are all powered in coordinated fashion by means well known in the machine art, as for example by means of a system of intermeshing gears, not shown. The power train for lateral drive 26 is advantageously synchronized with the power train for lateral drive 22 as by means of suitable gearing providing a mechanical interlock.

For purposes of affording a more complete understanding of the invention, it is advantageous now to provide a functional description of the mode in which the described machine operates. With the various supply rolls loaded for operation and with the webs that emanate from the supply rolls trained through the various drive arrangements, it will be apparent that the webs 36 and 38 are delivered toward the laminating station comprising the rolls 114 sandwiching a space therebetween, the comparatively narrow webs or strips of metal and paper being cooperatively drawn into alignment between the edges of the webs of outer ply material. At the same time, the lateral drive 22 delivers a sequence of discrete card elements into the medial space sandwiched by the webs of outer ply material, these discrete card elements comprising segments cut from the web 30. These card elements are delivered with their longitudinal axes, i.e. their axes of physical property orientation, aligned generally perpendicular to or at right angles with the longitudinal axes of the webs 36 and 38 of outer ply material. To state in another way, a web of interconnected, substantially isotropic business machine cards is produced by aligning the longitudinal axis of the material of web 30 perpendicular to the longitudinal axes of the material of webs 36 and 38. The finished web 136 is processed by the rollers 138 and 140 to produce a web that is readily printed and that may be severed transversely at uniform longitudinal intervals to produce individual cards.

Considering FIGS. -9, it will be appreciated that the card elements 88 and 90 which have been cut from the web 30 are delivered toward the transverse bars 78 by the rolls 80 in the final feed roller unit 74, overlapping of the subsequent card 90 over the leading, halted card 88 being achieved by the depressing action of lobes 86 of the roller elements 82. It will also be appreciated that, when the leading card 88 engages the transverse bar 78 to have its movement in the direction of arrow 64 halted, the high-spot sectors 106 of rollers 100 and 102 will be rotated to initiate engagement with that leading card element so as to accelerate it in the direction of arrow 104 as is shown in FIG. 8. While this transfer in the direction of movement of the leading card element is taking place, the trailing card 90 will start to overlap the leading card 88 as is indicated in FIG. 6. Skewing of the two cards as a result of frictional engagement is substantially eliminated because, as the rollers 100 and 102 advance the card 88 in the direction of arrow 104, the pickup rollers 110 engage and control the forward movement of that card upon the high-spot sectors 106 passing out of engagement therewith. Furthermore, the motion of the trailing card 90 is controlled through its engagement by the rolls 80 in final feed unit 74. Overlapping of the leading and trailing card elements while the high-spot sectors 106 are rotated out of engagement is illustrated in FIG. 9. A slightly subsequent configuration of the advancing card elements 88 and 90 is shown in FIG. 7 where the leading card element 88 has passed completely from between the rollers 100 and 102 and where the card element 90 is shown immediately before its engagement with the transverse bar or stop 78.

Turning to a consideration of FIGS. 11-13, the finished web 136 comprises leading and trailing card elements 88 and 90 cut from the material of web 30; and these card elements are embedded between the webs 36 and 38 of outer ply material. Coplanar with the material of web 30 and immediately laterally outwardly thereof is the magnetic material of the comparatively narrow webs 44 and 46; and laterally outwardly of the magnetic material is the non-magnetic material of the comparatively narrow webs 52 and 54. It is to be recognized that the material of web 30, in the finished card is situated with its axis of physical property orientation disposed at an angle, specifically at a right angle, relative to the axes of physical property orientation of the material of webs 36 and 38. Thus, the finished card is substantially isotropic in character, having a stable flatness and other resultant desirable properties.

The specific example herein shown and described is to be considered as being primarily illustrative. Various changes beyond those described will, no doubt, occur to those skilled in the art; and such changes are to be understood as forming a part of this invention insofar as they fall within the spirit and scope of the appended claims.

The invention is claimed as follows:

1. Apparatus for making a business machine cardcomprising: first drive means for continuously engaging a pair of spaced webs of outer ply material and transporting the same in a first direction; second drive'means for continuously engaging a third web of inner ply material and transportingthe same in a second direction laterally intersecting saidspaced webs; cutting means for severing said third web into discrete segments;v and transfer means positively engaging said segments individually for altering the direction of movement of said inner ply segments to coincide with the direction of movement of said webs of outer ply material.

2. Apparatusaccording to claim 1 wherein said second drive means transports the web of inner ply material in a direction laterally intersecting said spaced webs at right angles therewith. I

3. Apparatus according to claim 1 which further comprises third drive means for transporting said segments in the general path of movement of said third web.

4. Apparatusaccording to claim 3 wherein said third drive means includes deflecting means periodically engaging said segments to deflect a portion thereof whereby to permit overlapping of sequential segments.

5. Apparatus according to claim 4 wherein said third drive means additionally includes spaced guide members and drive roller means.

6. Apparatus according to claim 5 wherein said deflecting means includes lobed roller means interspersed with said drive roller means. ,1

7. Apparatus according to claim 1 wherein said transfer means includes stop means positioned, to arrest the advance of said segments in the path of said third web and third drive means acting intermittently to engage a stopped segment and to accelerate the engaged segment in the path of movement of said spaced webs.

8. Apparatus according to claim 7 wherein said third drive means comprises a pair of cooperating rollers, each of which includes a raised sector.

9. Apparatus according to claim 8 wherein said sector has a peripheral extent substantiallyequal to the difference between the length of said cooperating rollers and the width of a said discrete segment.

10. Apparatus according to claim 7 which further includes auxiliary drive means spaced closely with said,

third drive means to control a said segment upon its release by said third drive means.

11. Apparatus according to clai 3 wherein said transfer means includes stop meanse-positioned to arrest the advance of said segments in .the path of said third web and fourth drive means acting intermittently to engage a stopped segment and to accelerate the engaged segment in the path of movement of said spaced webs.

12. Apparatus according to claim 11- wherein said fourth drive means comprises a pair of cooperating rollers, each of which includes a raised sector.

13. Apparatus according to claim 12 wherein said sector has a peripheral extent substantially equal to the difference between the length of a said cooperating roller and the width of a said discrete segment.

14. Apparatus according to claim 13 which further comprises auxiliary drive means spaced closely with said fourth drive means to control a said segment upon its release by said fourth drive means.-

No references cited.

DARYL W. COOK, Primary Examiner US. Cl. X.R.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,526,562 Dated September 1, 1970 Inventor-(s) Ernest A. Dahl, Jr.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 2, after "magnetic" insert material to the forward drive; 21nd rolls 48 and 50 supply respectively;

Column 5, line 5, change "inserted" to --insert-- SIQNE AND win FEM m Allah Awning Offieer mum at Patent:

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