US1904006A - Pattern control mechanism - Google Patents

Description

Filed March 22, 1929 6 Sheets-Sheet April 18, 1933. c MEANS 1,904,066

PATTERN CONTROL MEQHANI SM Filed March 22, 1929 e Sheets-Sheet 2 INVENTOR z w he; 4 a l;

h ATTORNEY 3 April 18, 1933.

G. C. MEANS PATTERN CONTROL MECHANISM Filed March 22, 1929 6 Sheets-Sheet 3- INVENTOR' l8, G- c MEANS PATTERN CONTROL MECHANISM Filed March 22, .1929 6 Sheets-Sheet 4 INVENTOR M ATTORNEY$ April 18, 1933. G c. MEANS v 1,904,006

PATTERN CONTROL MECHANISM Filed March 22, 1929 6 Sheets-Sheet 5 A ATTORNEY5 l8, I c MEANS I PATTERN CONTROL MECHANISM Filed March 22, 1,929 I 6 Sheets-Sheet 6 l NVENTOR 49% C.

Patented Apr. 18, 1933 UNITED STATES PATENT OFFICE GAB-BIKER C. MEANS, OF POUGHIEEPSIE, NEW YORK ran-mm common imcnamsir Application filed larch as, me. Serial llo. 849,034.

The present invention relates toan improvement in pattern control mechanism for abric forming machines. One object thereof has been to rovide a pattern control mecha- 5 nism in WhlCh pattern changes are .commu- 'nicated to the fabric forming instrumentalities through the agency of selectivel -con-.

trolled variations in a magnetic or e ectromagnetic field such for example as may be efiected by the use of a pattern sheet in the form of a photographic or other representa tion having portions presenting different values of light and dark directly in conjunction with suitably sensitive devices adapted to vary the current in such a field in accordance with the occurrence of said light and dark portions on said pattern sheet. In the application of my invention to a loom, either incorporated therein or as an attachment thereto, it is contemplated that my improved apparatus; may be utilized in plane of the jacquard card and known selective mecha-- nism associated therewith.

Although the jacquard in' its better developed and coordinated forms affords a pattern pense on e' weaver whichmust be absorbed either b selling the ,fabric at a prohibitive per yar price or by s reading the expense over a large yarda e o the same attern at a lower pr ce. If t ere roves to no adequate demand for the abric, a substantial loss is- -incurred. Other commercial and'economic disadvantages arising'from this feature of the weaving industry will readily be ap arent. ne of ses a heavy initial burdenof ex-.

the purposes of invention is to provide a pattern control mechanism which will 0 crate directly from a pattern of a t pe w ich eliminates the necessit for proucing a mechanical equivalent. or example, I contemplate that such a pattern may be a previously formed fabric or photograph or other re resentation of a fabric. It may be a drawing or other representation or a facsimileof a fabric design, or] it may be in the form of a conventionalized design, as a suitable grouping of markings-to define or designate predetermined characteristics or changes to be incorporated or effected in the design of the fabric roduced.

It will be obvious t at the initial. cost of a pattern such as I'have referred to as being contemplated in connection with my invention is practically n ligible as com ared tothe cost of 'acquar cards. This a ords the weaver a c ance to execute fabrics from .special designs in relatively small uantities at a price which will attract business. It also ermits the weaver at low cost to try out e demand for or popularity of a wide variety of fabrics so that any given portion of his looms may beke t in production only on fabrics which have ound a ready market.

Other advantages derivable from the use of my invention will be apparent to those conversant with the art.

One embodiment of my invention as applied to a loom is illustrated in the accomfication and in which Figure 1 is a view partly in vertical sectio 'panying drawings forming part of this speciof a portion of a loom showing more particu I larly a group of heddles, grifi's for lifting the same and a portion of my selector mechanism; v V Figure'2, a view partly in horizontal section on the line II II of Figure 1; Figure 3, a view partly in vertical section showingmore particularly one form of grifi operatingand control mechanism and resettin means forming part of orcooperating wit my selector mechanism;

Figure 4, a view partly in vertical section on the line'IV-IV of Figure 3;

Figure 5, a view partlyin longitudinal and showing more particularly one form of.

pattern actuating mechanism cooperating with the light transmitting mechanism;

Figure 7, a fragmentary plan view of a' pattern in operative position with respect to the light transmitting mechanism; and,

normally holds the forward or detent car-.

Figure 8, a wiring diagram.

In the drawings, my invention is shown in connection with fabric forming instrumentalities of a 100111 of well known type includingbheddles 1 mounted to oscillate vertically etween guides 2 and rovided if desired with-weights 3 by which t e heddles are normally held in lowered position with their ends resting on a stop 4. Any appropriate heddle actuating or lifting devices ma be employed, as for example, grifi's 5 an 5', each suspended at one end of a cord or cords 6 which pass over pulleys 7, Figure 3, the other end of said cords being operatively connected with a reciprocable hook 8.

Effective grifi' actuating movement of said hooks 8 is accomplished by means of a rocker arm 9 pivoted on the loom frame at 10 and provided at its upper end with a hook engaging member, as a bar 11, and at its lower end wlth a cam follower 12 which engages a:

cam slot 13- in a rotatable cam mounted on the main shaft 14 actuated from any suitable source of power,.not shown.

Any suitable expedient may be employed to select predetermined griffs for operation by the mechanism 'ust above described. I have illustrated in igures 3 and 4 a known form of ifi selector mechanism which includes a etent 15 mounted at one end of a lever 16 pivoted at 17 A tension spring 18 rying end of lever 16 in raised'position. A portion of the rear end of the lever is positioned to engage lever tilting cams 19 mounted at any. desired predetermined intervals on a pattern chain 20 which advances with step-by-step rotation of a sprocket 21 operating in synchronism with the fabric forming loom mechanism in a well known manner. In operation, the detent 15 depresses the hook 8 into position to be engaged and moved outwardly by thebar 11 whenever a cam 19 engages the outer end of lever 16. It will be.

understood that in a very simple loom each hook 8 will actuate a single griif although my invention is applicable to looms employing grifi controlling and heddle actuating mechanism of widely varying types. In the embodiment shown in Figure 1 the heddles 1 are provided with undercut heads 22 normally positioned between the griifs ;5 and 5' which may remain idle or be actuated singly or together in accordance with a redeter-- mined arrangement or pattern. ith the parts positioned as indicated in the drawner contemplated by my invention, it is desirable to provide readily controllable means for deflecting the head 22 laterally to a position at the left for actuation by the grifi 5 or at the right for actuation b the griii 5. For this purpose, Iprovide a eddle bar 23 having longitudinal slots 24 through which upper portions of the heddles 1 extend. Four heddles are shown in this relation but the number may be varied. The opposite ends of bar 23 are slidably mounted in suitable supports or bearings 25 and 26 respectively, the latter being provided with a ridge or projection 27 positioned to engage a recess 28 in the under face of said bar 23, said recess having projection receiving end notches 29 and 30 respectively. This construction or its equivalent is provided to prevent accidental endwise or heddle actuating movement of the bar 23, such as might otherwise result from vibration of the machine.

One embodiment of means for controllably actuating one of the heddle bars includes a lever 31 pivoted at 110 and engaginga slot 32 in said bar 23. A tension spring 31 has a core 33 continuously energized y a coil 34'. i As shown in Figure 1, said armature is provided with a recess which receives the free or projecting end of core 33 so that the armature is readlly slidable on said core.

In the embodiment shown, core 33 is magnectically continuous with a magnetizable base 112 and a magnetizable shell 113 so that when armature 35 is in retracted position,

it will close a continuous magnetic circuit 1 through said core, base and shell. It will be understood that the magnetic efiect of the the fabric pattern in accordance with a predetermined design and in a manig. 2, embracing magnet just described will normally be sufficient to retain said armature in retracted position against tension of the spring 31' thus holding the lever 31' in retracted position.

Assuming that a loom is provided with a plurality of heddle bars, as 23, and actuating means therefor as shown, or their equivalent, it will also be desirable to provide means for selectively controlling the action of said bars through said actuating means in accordance with a pattern so that fabrics of a wide range of design may readily be made.

- operation.

The armature releasing mechanism hereinabove described includes means for controllably varying the magnetic elfectiveness of core 33 com rising a coil 50 wound in opposition to CO1]. 34 and so calibrated that, when it is energized by closing of its circuit the magnetic field of the electro-magnet is sufiiciently weakened to cause release'of armature 35 from contact with the edge of shell 113 of said magnet whereupon b operation of spring 31' said armature wit out diseng-agim from core 33 slides lengthwise thereof and into engagement with a perforated bar 39 mounted on a lever 40 pivoted at 41 and to which rocking motion is imparted in one direction by a cam 42 mounted on a shaft 43 suitably cared to or otherwise connected with main s aft 14, Figures 3 and 4, and in the opposite direction by a spring 48. With left hand movement of bar 39 spring 31' pulls lever 31 and with it bar 23 to the left. A heddlebar resetting membersor usher 44, positively actuated toward the rlght by a cam 45, through a rocker arm pivoted at 47, is deflected toward the right to ush the bars 23 back totheir ori 'nal or rig t hand position, as shown in igure 1, said arm being returned to its left hand position by means of spring 49. Meanwhile the perforated bar 39 is returned to the right or armature intercepting position, thus completing the cycle of Having described a form of mechanism whereby the heddles are moved from one position to another, with respect to the grifis 5 and 5' and back again, I will describe one embodiment of a selector mechanism whereby the sequence or occurrence of movements of selected heddles ma be automatically controlled from a suitab e pattern without the interposition of an intermediate mechanical equivalent of the design web or the punched cards of a jacquard. Such a device is one which selectively controls movement of the warp threads directly in response to indicia of pattern variations such for example as are presented by a drawing, picture, photograph, conventional representation of a design or the like, and other than the series of punched cards or design web of thejacquard. From the previously described portions of appoic'latus employed in connection with an em ment of my invention, it will be clear that the control or selection hereinabove referred to may be efie'cted through 'thecoils 50. In

other words, by controllabl varying the magnetizinglcurrent in selecte coils, the heddle or had es respeetivel associated there with and their corresponding warps will be moved or not moved with res ect to grifi's 5 and 5 to form any desired abric desi the changes of which may be elfected or 1ncorporated in the fabric in connection with the laying of each single filler thread or of any desired number of threads in a group.

One form of apparatus by means of which I selectively vary the current in coils 50 and thus achieve the desired design control involves the use of 'a pattern sheet A, Figure 7, which in'the form shown is of translucent flexible material, although I contemplate that an opaque material having surface portions of different light reflecting values as a photograph, drawing, or actual fabric, ora translucent or opaque material having portions of different-colors may be employed in connection with suitable variants of the embodiment hereinafter described to secure substantialy equivalent results. In the illustrated embodiment of my invention, selected portions of the pattern sheet bear markings which in effect produce a draw ing presenting a design in terms of light areas 51 and dark areas 52, thus determinm the relative values of light transmitte through different portions of said sheet. However, where the pattern is other than .a fabric, a facsimile of the fabric des' n to be produced, or a photograph or the fike, the sheet may be provided with markings ,which divide t squares, rectangles or spaces of other shape and of convenient or suitable area. simple form of apparatus, each longitudinal row of units on the pattern sheet corresponds to a warp thread or a plurality of warp threads and each transverse, row to a filler as I 0 surface into pattern units as Ina thread or a plurality thereof. By varicoloring in some known degree with the intensity of the light to which it is exposed.

As shown in Figures 5 and 6, the pattern sheet Ais assembled inoperative relation to a light sensitive or photo-electric cell 53, in-

dicatedin Figure 8, which, in response to lightand dark variations 1n sa1d pattern,

varies the amount of current in the coils 50.??"

Said pattern, preferably in the form of an endless strip, is conveniently mounted on attern advancing rolers 54 to which a stepy-step movement is imparted by a pawl-55 cooperating with a ratchet .56 operatively' connected to one of said rollers 54. The pawl '55 is mounted on a pivoted armature arm 57 actuated in one direction by a magnet 58 and in the opposite direction by tension of a spring 59. The parts just described are so 5 proportioned and assembled that the pattern sheet is periodically advanced over a dis-' tance equal to the longitudinal dimension of a pattern unit or area corresponding to one or any desired number of successively laid filler threads in the fabric design. In other words, the period may be that of one passage of the shuttle in one direction across the shed or any number thereof. In the illustrated ap aratus, a switch interposed in the circult of the pattern advancing magnet 58, is periodically closed by av spring contact disposed in the path of a lug 61 positioned on the cam 45, Figure 4, in such a way that each increment of pattern sheet advance takes place in proper predetermined sequence with respect to the previously described heddle actuating and resetting mechanism.

Between successive increments of advance of the sheet A, a single transverse row of its attern units is positioned in operative reation to a source-of light and to means for progressively applying the varying light transmitting efiect of the differently colored or valued units or areas in said row to the cell 53. As shown in Figures 5 and 6, a source of light, as a lamp 62, is positioned in a housing 63 provided interiorly with reflecting surfaces preferably such that light rays from the source concentrate substantially over an elongated slotike opening 64 in a lower portion of the housing 63, said opening being long enough to extend across a complete row of pattern units and, if desired, narrower at the end adjacent to cell 53 than ,at its opposite end, Figure 7, to equalize the difi'erence, if any, in cell effecting values of the light transmitted to the cell from, different dlstances.

tube or tube-like ousing 65 having a longitudinal opening 66 opposite the opening 64 in housing 63. The pattern sheet A. is operatively arranged between and transversely across said openin s 64 and 66. A reciprocat'able shutter strlp 67 movable longitudinally with respect to said openings 66 and 64 1 passes between the pattern sheet A and the light sensitive cell and is provided with an aperture 68 which is located opposite one face of a reflecting prism 69 and preferably somewhat longer than the width of opening 64, Figure 7, to allow for deviation of the strip 67 from true alignment with the opening 64. The prism 69 is secured to the under side of shutter strip 67 and has its reflecting surface 70 so positioned with respect to the aperture 68 that light rays coming through said aperture are reflected through the housing65 and into effective contact with the cell 53. It will be apparent that, in operation,

when aperture 68 comes opposite or beneath a relatively light or translucent pattern unit,

a certain intensity oflight reaches the reflecting prism surface 70 and upon contact with cell 53 produces an electric current of 70 determinable value. Obviously, when a erture 68 comes opposite or beneath a dar for opaque pattern unit, less light is.tr'ansmitted"' f to cell 53 so that less current or no effective?" current is produced therein. As indicated '7 diagrammatically in Figure 8, the output of cell 53 connects with an amplifier, as a'v'a'euum tube set 71, of any suitable type and" I less band, is extended over the peripheries '85 of pulleys 7 2 and 73 to which alternate rotation in opposite direction is imparted by any suitable reversible driving means. As shown in Figure 5, friction drive wheels 74 and 75 are operatively positioned opposite the under face of an upper portion of strip 67 and are continuously actuated simultaneously in opposite directions, as by a motor 76 and belt 77. A suitable form of clutch for effecting the to-and-fro motion of strip 67 and thereby of prism 69 is provided and may conveniently be of the type illustrated, which includes contact rollers 78 and 79 respectively pivotally mounted on opposite ends of the cross member of a T-shaped armature bar 80 and adjacent to peripheral portions of the drive wheels 74 and 75 respectively.- When not in operation the armature bar 80 occupies a position midway betwen. magnets 81 and 82. If the coil of magnet 82 is energized, armature bar 80 is deflected to the left, Fig. 5, thus swinging the contact ll t t h The cell 53 is ositioned at one end of ar0 er 78 m 0 enbagemen wlth t 8 Shutter strip 67 and pressing the latter into efiective drivin 74. T is operation moves prism 69 toward cell 53. By cutting out coil 82 and ener-' gizing coil 81, prism 69 is moved in'the opposite direction or back to the position shown in Figure 5. Obviously, the traverses engagement with the drive wheel no of the prism must be timed to take place bev tween successive increments of advancing movement of the pattern sheet A so thatthe latter will be stationary,while prism 69 1 moves transversely across it.

of the rollers 78 and'7 9 and timing of the- 20 Suitable means for controlling p fa prism traverse comprise a circuit including a manually operated switch 101 and in which one terminal of each of the coils, 81 and82 is periodically connected electr cally to a' distributor bar 91, Figure 5, through a. switch 99 actuated by a cam 100 mounted on shaft 43 and, during other portions of the opera- 7 7 tion, through a relay actuated. switch The other terminal of coil81 is connected to a a distributor bar 93 and the other terminal of coil 82 to distributor bar 92. A contact carrier 94 secured to and movable to and-fro with the shutter strip 67 is provided with interconnected brushes in the form of spring contacts or arms 95, 96 and 97. The bars 91, 92 and 93 are conveniently mounted in a panel board 98 and .so positioned that when carrier 94 .is in its extreme left hand position, as shown in Figure 5, bars 91 and 93 are connected electrical y through arms 95 and 97 When the carrier is in the opposite or extreme right hand position, bars 91 and 92 are electrically connected through arms 95 and 96.

A rela coil 83 of switch S is in circuit with the are 92 and 93 and when energized actuates the moving member .84 of said switch S, said moving member being referably pivoted at one end and having its free end positioned to move to and from a fixed.

terminal 85. A spring 87 holds the member 84 normally out of engagement with terminal 85 when coil 83 is deenergized.

In operation, assuming the partsto be at rest in the relative positions indicated in Figure 5, the cam actuated switch 99 closes, thus closing the circuit through coil 81 and deflecting 'roller 78 so that carrier 94 moves toward the right. As soon as carrier 94.

moves far' enou h tobring arm 96 into engagement with ar 92, the circuit of magnet coil 82 is closed but this does not afieet the position of armature 80 which remains in engagement with the core of coil 81. Relay 83 is energized simultaneously with magnet coil 82 and closes switch S after which the cam operated switch 99 is opened and remains open during the remaining traverse of carrier 94 toward the right. As carrier 94 approaches its ri ht hand position, arm 97 disengages from ar 93 to open the circuit of coil 83, thus opening switch S. With switch 99 still open, thecircuit-of coil 81- is broken sothat armature 80 is free to assume its intermediate position. After an interval suflicient to advance the pattern strip and to complete the laying of at least one filler thread, switch 99 is again closed by cam 100, thus establishing the circuit through bar 92 and coil 82 to reverse the direction of movement of strip 67. The switches 99 and S then operate as before in a cycle which is repeated either at the will of the operator or during continued fabric forming operation of the opened previousl described. a. shown in Figures 5 and 8, e coils 50 are in circuit with a plurali of separate contact terminals 103 and the istributor bar 91' with which the arm 95 remains continuously in sliding contact during oscillation of the carrier 94. Another contact arm 104 connected electrically with said arm 95 is mounted on carrier 94 and therefore moves successively in both direcv tions across the contacts 103, so that the current condition existing in the circuit of each of said contacts 103 by reason of the strength or weakness of light intensity through the respective pattern units correspondmg to the respective terminals or contacts is transmitted to or becomes effective in a corresponding coil 50. If the unit is .dark no heddle movement will take place; if light, the heddle will be deflected in the manner and for the purposes hereinbefore described.

Referring to Figure 8, the shutter strip actuating motor 76 is in a circuit which includes a switch 105. When the latter is open, the selector mechanism hereinabove described will remain inoperative. Similarly, if the switch 106 in the circuit of lamp 62 or the switch 107 in the circuit of cell 53 be the design or pattern selector devices stop e ective operation. Any or all of these or other expedients may be employed to mterrupt or restrain operation 0 the selector devicesindependently of the normal fabric forming mechanisms.

' Although the pattern sheet A has been described as comprising light areas and dar areas which define the design, it will be aparent that the filler threads or yarns of the of color or of tone value. For example, the designs may call for blue and red fillers in which case the filler thread'controlling or .ment presenting a pattern defined bylight and light and dark portions, means for intermittently advancing said element, a photoelectric cell, and means movable transversely of the pattern element for effectively transmitting-to said cell increments of light which vary in cell afiecting value according to the light value afl'ecting characteristics of said light and dark portions of the pattern.

abrie to be formed may be of any variety 2. In pattern control mechanism for looms and the like, the combination of a pattern sheet presenting a pattern defined by light and dark portions, means for intermittently advancing said sheet, a photo-electric cell, and means operative between increments of advance of said pattern sheet for effectively transmitting to said cell light which varies in cell atl'ecting value according to the light value afl'ecting characteristics of said light and dark portions of the pattern, said means including a source of light, a reflector mount ed to direct light rays toward said cell, and means for reciprocating said reflector in the path of light rays affected by said light'and dark ortions of the pattern.

3. n a loom having heddles and means for efiecting endwise movement thereof, the combination of a plurality of heddle movin members, means or actuatin each of said members including means ten ing normally to move said member in one direction, an electro-magnet having an armature operatively connected to said member and tending normally to retain said armature and said member retracted in the opposite direction, and means for controllably releasing said armature including a attern element presenting a pattern defined y portions having characteristics which affect in diflerent degrees the value of light transmitted therethrough, a photo-electric cell means for presentin said cell in operative relation to successive occurring transversely aligned portions of said pattern sheet, and an amplifier having its input connected to said cell, and means for connecting its output to said electro-magnets in succession.

4. In attern control mechanism for looms, the com ination of a pattern sheet having portions of different light obstructing characteristics, a source of light at one side thereof, a photo-electric cell, means at the other side of said pattern sheet for transmitting to said cell light rays passing through said portions of said sheet, a plurality of electro-magportions of different light obstructing characteristics, a source of light at one side thereof, a hoto-electric cell, means at the other side 0 said pattern sheet for transmitting to said cell light rays passing through said por-' tions of said sheet, a plurality of electro-magnets se arately electrically connected with said ce said means comprising a reciprocatable strip attached to said light ray transmitting means, driving means therefor, and

. means for periodically arresting movement of the strip and reversing the direction thereof.

6. In a loom, the combination of a plurality of heddles, a lurality of heddle. bars engagin said hedd es and movable-endwise, a-plura ityof levers each "having its free end engaging a heddle bar, a spring securedto-each eve'r and normally tending to deflectsaid free end of the lever in one direction, a magnet having an armature connected to saidside of said photograph and in operative relation to said cell, and means for moving said reflector back and forth in the path of light rays passed through the photograph. 7. A loom having warp raising and lowering instrumentalities and means for moving a portion-thereof laterally, including means normally tending to deflect said portion m one direction, a magnet having an armature operatively connected to said deflecting means and tending normally to retain said armature and said deflecting means retracted in the opposite direction and, means for selectively varying the efiect ivefields of said magnets in succession to release their respective armatures whereby the latter are permitted to be moved away from said magnets with said deflecting means.

8. In pattern control mechanism for apparatus having fabric forming instrumentalities and means for se arately actuating each of the same, the comliination of means for operatively positiqning. portions of said actuating means, means tending normally to move said positioning means in one direction, a magnet for each separate instrumentality actuating means and having an armature operatively connected to said ositioning means and tending to retain said arma-. ture and said positioning means retracted 1n the opposite direction, and meansfor selectively varying the eflectivefields of said magnets to release their respective armatures successively from said retracted position.

9. In pattern. control mechanism for apparatus having fabric forming instrumentalities and means for separately actuating each of thesame, the combination of means for operatively -positioning portions of said actuating means, means tending normally to move said positioning means in one d1rection, a magnet for each separate instrumentality actuating means and having an armature operatively connected to said osltloning means and tending to retain sald armature and said positioning means retracted in the opposite direction, a pattern element presenting a pattern defined by portions having characteristics which affect in different degrees the value of light transmitted therethrough, and light sensitive means cooperating with said attern element and successively with sai magnets to separate]; selectively vary the efiective' fieldsthereo .in retions of said pattern element in respect to presenting the value of light transmitted therethrough. 10. In pattern control mechanism for looms, the combination of a pattern sheet having portions of different light obstructing characteristics, a source of light at one side thereof, a hoto-eleetric' cell, means at the other side 0 said pattern sheet for transmitting to said cell light rays passing through said portions of said sheet, a plurality of electro-ma nets separately electrically connected wit said cell, said means comprising a reciprocatable strip attached to said light ray transmitting means, and driving means therefor.

11. In a loom having heddles and means for effecting endwise movement thereof, the combination of a heddle moving member, means for actuating said member including means tending normally to move said member in one direction, an electromagn'et having an armature operatively connected to said member and tending normally to retain said armature and said member retracted in the opposite direction, and means for controllably releasing said armature includin a pattern element presenting a pattern de ned by ortions having characteristics which affect in difierent degrees the value of light reflected therefrom, a photo-electric cell, means for said cell in operative relation to successive occurring transversely aligned fplortions 0 said pattern sheet, and an amplier having its input connected to said cell, and means for connecting its output to said eleetromagnets in succession.

12. In pattern control mechanism for apparatus having fabric forming instrumentalities and means for separately actuating each of the same, the combination of means for operatively positioning portions of said ing characteristics which affect in different actuating means, means tending normally to move said positioning means in one direction, a magnet for each separate instrumentality' actuating means and having an armature operatively-connected to said positioning means and tending to retain said armature and said positioning means retracted in the opposite direction, a pattern element presenting a pattern defined by portions havdegrees the value of light reflected therefrom, and light sensitive means cooperating with said pattern element and successively with said magnets to selectively and separately vary the eflective fields thereof in response to differences in characteristics of transversely aligned pattern defining portions of said patternelement in respect to the value of light reflected therefrom.

13. A loom having warp raising and lowering instrumentalities and means for moving a portion of each thereof laterally, 1n-

eluding means normally tending to deflect said portion in one direction, a magnet having an armature operatively connected to said de ecting means and tending normally to retain said armature and said deflecting means retracted in the op osite direction, and means for selectively diminishing the effective fields of said magnets in succession to release their respective armatures whereby the latter are permitted to be moved away from said magnets with'said deflecting means.

14. In pattern control mechanism for apparatus having fabric forming 'instrumens talities and means for separately, actuating each of the same, the combination of means for oper'atively positioning. portions offsaid actuating means, means tending normally to move said positioning means in one direction, a magnet for each separate instrumentality actuating means and having an armature .operatively connected to said positioning looms and the like, the combination of a pattern sheet presenting a pattern defined by light and dark portions, means for intermittently advancing said sheet, a photo-electric cell, and means for-effectively transmitting to said cell light which varies in cell affecting.

value according to the light value affecting characteristics of said lightand dark portions of the pattern, said means including a source of light, a reflector mounted to direct light rays toward said cell, and means for reciprocating said reflector in the path of light rays afiectcd by said light and dark portions of the pattern.

16. In selective control apparatus, the combination of an electromagnct having a core and coils wound in opposite directions thereon, an armature, means tending normally to move said armature away from said core, means for periodically moving the armature into contact with the core, means for energizing the coils, and means for periodically 18. In pattern control mechanism for looms and the like, the combination of a pattern sheet presenting a pattern defined by light and dark portions, means for intermittently advancing said sheet, a photo-electric cell, and means for successively transmitting to said cell increments of light which vary in cell affecting value accordin to the light value affecting characteristics 0 transversely aligned light and dark portions of said pattern, said means including a source of light, a reflector mounted to direct light rays toward said cell, and means for reciprocating I said reflector in the path of light re s a fected by transversely aligned'light an dark portions of the pattern.

19. A loom having warp raising and lowerin instrumentalities, including means for moving a portion of each thereof laterally comprising a spring, a magnet having an armature operatively connected with said" spring and normally tending to hold said armature retracted in a direction opposed to the spring, means forselectively varying the effective field 'of one after another of-said magnets to progressively release their respective armatures, and means for moving said armatures toward said magnets againsttension of their respective "sprmgs.

20. In pattern control mechanism for looms, the combination of a pattern sheet having portions of difi'erent light obstructing characteristics, avsource of light at one side thereof, a hoto-electric cell, means-at the other side 0 said pattern sheet for transmitting to said cell light rays passing through means, and

21. In pattern control mechanism for said portions of said sheet, a plurality of electromagnets, means for separately electrically connecting said electromagnets with said cell, said means com rising a reciprocatable strip attached to said light ray transmitting driving means therefor.

looms and the like, the combination of a (pattern element presenting apattern define by light and dark areas, a photo-electric cell,

, and means reciprocatable transversely of the March, 1929.

pattern element to transmit in succession 'to said cell light rays which vary in cell output afiecting value according to variation in the light value afiecting property of transversely aligned areas of said pattern.

In testimony whereof, I have signed my name to this specification this 21st day of GARDINER o. MEANS.

CERTIFICATE OF CORRECTION.

Patent No. 1,904,006.

GARDINER c MEANS.

It is hereby certified that error appears ill the printed specification of the April l8,- I933;

above numbered patent requiring correction as follows: Page 5, line 114, claim 1, strike out the words "and light"; and that the said Letters Patent should be read with this correction therein that the same may'conform to the record of the case in the Patent Office. I

Signed and sealed this 23rd day of May, A. D. 1933.

M. J. Moore. (Seal) Acting Cotmniaaioner of Patents.

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