US2005070A - Lace attachment for full fashioned knitting machines - Google Patents

Description

' .Il .lne 18, 1935. G Bij-2ER 2,005,070

LACE ATTACHMENT" FOR FULL FASHIONED KNITTING MACHINES Filed May 4, 1953 4 Sheets-Sheet l y FJ. 123-1.- 7592 INVENTOR"l .lime 18, 1935. Q Bn-ZE 2,005,070

LACE ATTACHMENT FOR FULL FASHONED KNITTING MACHINES Filed May 4, 1933 4 sheets-sheet 2 :FLE-fil 1 6022705131? er,

l .5 v BY j i,

A TTORNEY.

June 18, 1935. G. BITZER 2,005,070

LACE ATTACHMENT FOR FULL FASHIONED KNITTING MACHINES Filed May 4, 1933 A 4 Sheets-5h69?. 5

Fl E- 6 ATTORN'E'YQ June 18, 1935. G. BlTzER LAGE ATTACHMENT FR FULL FASHIONED KNITTING MCIIIJES Filed May 4, 1933 4 Sheets-Sheet 4 Patented June 18, 1935 UNITED STATES 2.005,07@ LACE ATTACHMENT Foa FULL rAsmoNEn KNITTIN G MACHINES Gottlob itzer, Wyomissing, Pa., assignor to Textile Machine Works, Wyomissing, Pa., a corporation of Pennsylvania Application May 4, 1933, Serial No. 669,290

11 Claims.

This invention relates to full fashioned hosiery knitting machines, and more particularly to a lace attachment adapted to function in conjunction with and under control of certain elements ofthe knitting machine, for producing a Wide and varied range of designs in the hosiery knitted thereby l The lace attachment to which the present invention is-particularly adaptable is shown and described in the assignees copending application, Serial No. 561,536, iled September 8, 1931. The lace` attachment disclosed in the said copending application primarily comprises a longitudinally u slidable bar provided with a series of points adapted to lift knitted stitches from predetermined needles of the machine and to deposit such stitches on others of the needles, under control of a design cam which actuates the slide bar to align the transfer points withv the desired needles in each instance.

The number of relatively different movements capable of being imparted to a cam follower by a single cam in a single cycle of operation thereof is determined by the character and the extent of the required movements and by the amount of available camming surface afforded by the cam element, the amount of camming surface in turn being determined by the diameter. of the cam element, especially where the cam element is of the disc type and the cam follower engages the peripheral edge of the disc. The diameter of the cam disc is frequently controlled by the amount of' available clearance in the device of which the cam is a part, while'in other instances the diameter of the-cam is purposely restricted in order to make the device, as a whole, in the mst compact form consistent with practicability and efficiency.

40 tion is particularly concerned, compactness is desirable, and in order to provide a wide range of design, necessitating a large number of diierent positionings of the transfer points relative to the needles of the -machine, a plurality of axially aligned disc cams of relatively small diameter each is employed. A single cam follower operatively associated with the longitudinal slidable point bar cooperates with the plurality of cams and is arranged to be shifted laterally from the 0 plane of one of the disc cams to the plane of another of the cams, each cam disc providing for as great a number of different movements of the point bar as is possible within the amount oi? available camming surface afforded by the peripheral edge ofthe disc, whereby successive, alternate, or selective engagement ci the single cam follower lwith the different cam discs will, as a whole, pro- Nvide the necessary large number of different movements for the point bar.

1n the device disclosed in the above noted co- In the device Awith which the present inven-` (Cl. (i6- 96) pending application the cam follower is arranged to be moved manually from alignment with one v The object of the present invention is to provide means for automatically shifting the cam follower Without interrupting the normal operation of the machine.

Another object of the invention is to provide means, in the form of a master cam, for automatically making the selection of the design cam to be engaged by the cam follower, whereby more -intricatev designs may be produced which will require the use of all the cams in succession or one or more of the cam discs two or more times successively, or various cams in an irregular prearranged order, within a single repeat ofthe design as a whole.

The operation of the lace attachment in general, and the improvements to be covered by the present application in particular, will be fully disclosed hereinafter, reference being had to the accompanying drawings, of which:

Fig. l is a transverse sectional elevation of suicient of a full fashioned hosiery knitting machine of conventional type to illustrate the lace attachment and improvements according to the present invention as applied thereto;

Fig.` 2 is a fragmentary plan view drawn to an enlarged scale and illustrating the lace attachment and improvements more in detail;

Fig. 3 is a Vfront elevation 'of the mechanism shown in Fig. 2;

Fig. 4 is a rear elevation of a portion of the mechanism shown in Figs. 2 and 3;

Fig. 5 is an end elevation of a portion of a mechanism shown in Fig. 4 as viewed from the left; and

Fig. 6 is aA sectional elevation taken on the line -t, Fig. 4.

Conventional types of fiat full fashioned hosiery knitting machines each include a main cam shaft l, which is provided with a series of cams arranged, under normal knitting conditions, to actuate the bank of needles 2 and other cooperating elements (not shown) to produce course after course of stitches of which the stocking fabric is composed.

In order to narrow the fabric, in providing for the fashioning of the stocking, stitches lifted from the needles on which they were formed at second series of cams on the shaft I, the said shaft is shogged longitudinally to align the cam followers cooperating with the first series of cams with complete circular discs on the cam shaft, whereby the stitch-forming mechanism becomes inoperative, as the longitudinal shogging of the cam shaft I brings the second series of cams thereon into alignment with cam followers through which the dipping actions of the transfer points and the inward narrowing movements of the transfer points are effected.

Operation of the lace attachment disclosed in the above noted copending application, and in the present application, is effected by the second above noted series of cams on the main cam shaft I when such shaft is shogged in the manner above noted. However, at such time, theregular narrowing points are moved to an inoperative position and the narrowing mechanisms, by which the narrowing points are moved inwardly, are thrown out of operation and a set of lace points, illustrated at 3 in the present case, are -moved intoeposition to engage and lift stitches from certain of the needles 2 and to transfer such stitches to other adjacently disposed needles in the bank thereof.

In the present instance, the lace points 3 are carried. by point holders 4 which are rigidly secured to a shaft 5, which is mounted in bearings 6 rigidly secured to the front rod 1 of the usual dipping mechanism found in machines of the type noted. The rod 1 also carries supports 8 in which the bars 9, 9 for the regular narrowing points are slidably mounted.

The point rod 5, in addition to a possible rotary motion for throwing the lace points 3 out of operation, is arranged for longitudinal sliding movement in the brackets 6 for shifting the lace points 3 as a unit from alignment with certain of the needles 2 in to alignment with others of the needles, between the dipping motion of the rod 1, by which the points 3 lift the stitches from the selected needles 2 and a second dipping motion of the rod 1 whereby the points 3 place the lifted stitches on adjacent needles, in the coursel of formation of the lace design in the fabric.

Longitudinal movement of the point bar 5 is effected by the mechanism shown in Figs. 2, 3 and 4 particularly. The dipping bar 1, as usual in this type of machine, is fixed, insofar as rotation about its own axis and longitudinal movement is concerned. The rod 1, however, is permitted bodily lateral movement through an arc struck from the center of the dipping shaft I0, which is provided for in the usual manner, whereby the above noted dipping action of the points 3 relative to the needles 2 is effected. Y

Rigidly secured to the dipping rod 1 is a bracket I I which is provided with a bearing I2 for rigidly supporting a transversely extending shaft I3. In order to facilitate assembly of the parts of the mechanism hereinafter described, the shaft I3 is formed in two sections I3b and I3c (see Fig. 6).

These sections are threaded into opposite sides of the bracket I I, and secured therein, as indicated at I3d and I3e, respectively. For convenience herein, however, said shaft will be referred to as ayunit, by the numeral I3, since it is evident that the parts I3b and I 3c could be formed in one piece if desired. f

Rotatably mounted on the shaft I3 is a ratchet wheel I1 which is provided with a hub I1a having secured thereto Aa series of design cams, ln the present instance three in number, illustrated at I4, I5 and I6 respectively. Thedesign cams are Vrigidly joined to the hub I1a by means of a plurality of suitable bolts I1b which extend trans` versely through the cams and a large diameter portion I1c of the hub I1a and thence into the abutting side ofthe ratchet wheel I 1. These bolts are readily removable for disassembly of the cams and ratchet when desired.. One end of the hub I1a is held in frictional engagement with one end of the bearing I2 by means of the re- I8 engaging` silient plate or brake element the opposite' end of the hub I1a of the ratchet wheel I1, the pressure of said brake being determined by a nut I9 threaded on the shaft I3, whereby the said ratchet wheel and cam discs are maintained in a fixed position during reverse movements of a pawl 20, by which 'intermittent ,rotation of the ratchet wheel I1 and design cams I4, I5 and I6 in one direction is effected.

The pawl 20 is pivotally mounted at 2l on a rocker 22 which in turn is pivotally mounted on the hub I1a of the. ratchet wheel I1. The rocker 22, is rocked in one direction by a spring 23 having one end attached to the rocker 22 and itsopposite end secured to an anchorage 24 which is secured to the dipping rod 1. 4

Rocking of the arm 22 in an opposite direction', to advance'the design cams I4, I5 and'IS step by step in accordance with the spacing of the teeth of the ratchet wheel I 1, is effected by a bell-crank lever 25 which is pivotally mounted on thebracket I I with one arm 25 of said bell-crank lever underlying and engaging an arm 21 formed on and extending from the rocker 22, the second arm 28 of the bell-crank lever 25 lying in engagement with a pin 29 mounted in and extending laterally from a lever 30 which is loosely mounted on `the dipping rod 1. l

Pivotally attached to the arm 30, by the pin 29, is one end of an actuating link 3|. The opposite end of the link 3| is pivotally connected to a lever 32 which is pivotally mounted on the back dipping shaft I0. Pivotallyl attached to the lever 32 is one :end of a link 33, the opposite end of which is pivotally connected to one arm 34 of a lever 35. 'I'he lever 35 is pivotally mounted at 36 to a fixed portion of the machine. The second arm 31 of the lever 35 is provided with a cam follower 38 which is adapted to be engaged ,by a. cam 39 secured to the main cam shaft I, whereby each revolution of said cam shaft, while said shaft is in its shogged position, through the system of levers, links. rocker and pawl just described causes simultaneous rotation of the design cams I4, I5 and I6 to the extent of one tooth of the ratchet wheel I1.

At one side of the design cams I4, I5 and I6, and adapted to be engaged by any one thereof, is a cam follower 40. The cam follower 40 isirotatably mounted on a shaft 4I which is rigidly secured in the arms 42, 42 of a yoke head 43 formed at one end of a point rod actuating lever 44.

The point rod actuating lever 44 is pivoted at 45 rthe cams I4, I5 and I6 is provided with a latroller, is freely rotatably mounted on the shaft 4I and is adapted to be shifted laterally, between the limits determined by the fork ends 42, 42 of the lever 44, and for this purpose a shift rod 5I) isy slidably mounted in the arms 42, 42 in substantially vparallel relationto the shaft 4I.

, 'Ihe shift rod 50 is grooved, at' 5I, to receive the edge of the roller 40 while permitting free rotation of the roller within the groove. Lungitudinal .movement of the shift rod 50 slides the roller 46 along its shaft 4I, from alignment with and inthe plane of vone of the cam -discs I4, I5 or I6, as the case may be, into the plane of and in alignment with one other of said cam discs, un-

der selective control of mechanism hereinafter described.

secured to the one end er me shift rod so is a clamp, block 52 from which vertically projects a pin 53, which, Aunder certain circumstances as hereinafter noted, may be employed as a handle' for manually sliding the shift rod 5I! and consequently the roller 40 axially of the shaft 4 I.

Pivotally mounted at 54 on the bracket II isa double arm lever 55, one arm of which is forked vas indicated at 56 (see Fig. 2) to receive the actuating pin 53.. .The second arm. of the lever has.y

pivotally mounted thereon a roller 51 which is engaged by a master cam 58.v A suitable spring 51a is provided between the mounting for the roller 51 and the end of the shaft I3, to maintain the' roller in-engagement with the'master cam 58. The master cam 58 is rotatably mounted on the shaft I3.. integrally attached tothe master cam 58 for rotation therewith, is a ratchet wheel 59.

The ratchet wheel 59 is 'adapted to be engaged `by a pawl 60' which is pivotally mounted on the rocker 22,' a clamp brake 6I being provided to maintain the ratchet wheel 59 and master cam 58 in a substantially fixed position on the shaft I3 between intermittent movements of the said ratchet wheel and master cam as effected by the pawl 60, v under predetermined circumstances, when the rocker 22 is rocked in the manner above noted.v The pawl 60 is loosely mounted'on a stud 62 projecting laterally from the rocker 22.l

y Loosely mounted on the stud 52 intermediate the paw160 and rocker 22 is al pawl-controlling or hold-out arm`54. The hub of the hold-out arm 64 is shouldered, as illustrated at 65 in Fig. 2, which shoulder cooperates with a shoulder 66 formed on the hub of the pawl 60. The rocker 22 is provided with a hook-like extension 61 to which is connected one end of a spring 68, the opposite end of said spring being connected to the hold-out arm 64 aand tending at alltimes to rotate said arm about the axis of the stud 6,2 and into contact with a stop screw 59, through the coaction of the shoulders 65 and 66 on the hub .of the pawl 20 with the ratchet wheeLH.

The frontcam I4 of the cani unit including A erally extending cam surface 10 which, as the cam unit approaches the end of each complete l revolution, engages an inclined cam surface 1I on a laterally extending projection 12 formed von the lower end of the hold-out arm 64.

` When the cam unit completes a full revolution and attains the position shown in Eig. the cam surface 10 has moved across the inclined surface 1I and to a position outside the projection 12 on the hold-out arm 64, thereby rocking the hold- .out arm 64 about the stud 62 and away from the stop screw 69. In so doing the shoulder65 of Ithe hold-out arm 64 moves away from the shoull der 56 on the pawl 60, thereby permitting the pawl 6B to drop, by gravity, into contact with the ratchet wheel 59, as shown in Fig. 4.

The cam surface 10 is formed on a cam'piece 15 carried by the outer cam I4 of the cam unit and while the heel 16 of the cam piece 15 is holding the pawl control lever 64 in a position `to free the pawl 6I), the .point 11 of the said cam piece 15 ,engages 'a collar roller 18 mounted on the shaft 4I, on which the camv follower 40 is also mounted.

Upon the next rocking movement ofthe rocker 22 thepawls 20 and 66, then inengagemenlrwith.

the ratchet wheels I1 and 59 respectively, effect a one step movement of each of the ratchet wheels and consequently a one step rotation of the cam unit including cams I4, I5, I6 and a simultaneous movement of the master cam 58.

The above noted movement of the cam unit lever 44 slightlyrabout its pivot and'sufliciently to release the cam follower 46 from the periphery of the cam disc I4, I5 or I6, as the case may be. At the same time the one step movement of the master cam 58 effects a rocking m0- tion of the lever 55 about its pivot'54, causing I 4-I5--i6 causes the-camI piece 15 to rockthe a longitudinal shifting movement of the shift rod 56, whereby the cam follower 40 is shifted' laterally from one of the cams 'of the unit toanother of said cams, in accordance with the length of the radius described by the portion of the cammingl surface of the cam 58 then engaging the cam follower 51 of the shiftvlever 55.

As soon as the shift of the cam follower 40 is completed the cam piece 15 moves away from the collar 18, permitting the lever 44 to'rock in the opposite direction, thereby bringing the cam 40 ming surface of the master cam 58.'

At the same time as the point 11 of the cam piece 15 moves away fromthe collar 18 the heel into. operative engagement with the newly select- 'ed cam of the unit as determined.V by the cam- 16 of the said cam piece 15 rides off the lower end of the projection 12 of the pawl control lever $4, whereupon the spring 68 returns the pawl control lever 64 into its quiescent pawl-retracting position in engagement with thestop screw 69. In so doing the shoulder 65 again engages the shoulder 66 of the pawl 60 and thereby lifts the pawl 6U out of engagement with the lirom the above, it will be apparent that by complete revolution of the cam unit, a practicallyv unlimited number of different positionings of the lace points 3 relative to the needles 2 may be provided. Furthermore the selection of the cam y is effected,k without interruptingthe normal operation of the machine.

In some instances, one of the cams of the unit may be reserved for producing one particular class of stitch formation once, twice, or repeatedly throughout the knitting of a stocking, without the use of the other cams of the unit. For example, the cam I6 may be reserved for the formation of a picot edge, in which case the cam follower 40 may be moved into alignment with the cam I6 at the propertime, in the knitting of the stocking, by the master cam 58, but in instances where this picot edge formation of stitch is to be repeated constantly throughout the formation of vthe stocking, to give a certain design eect in the fabric, the cam follower 40 may be. brought intoalignment'with the cam I6 manually, in which case the pin 53 on the shift rod 50 is used as a nger grip or handle for-sliding. the shift rod 58, and consequently the cam follower 40, longitudinally of the shaft 4I to bring the roller 40 into alignment with the cam I5.

In addition to its longitudinal movement the shift rod'50 is permitted a certain amount of rotary motion, in the fork arms 42, 42 of the lever 44.l Such motion is limited by a depending pin.

80 which is held in contact with one side of the shaft or pin V4I by a spring 8I (see Figs. 4 and 5). When the roller 40 is aligned with the cam I 6 under such circumstances the depending pin or arm 88 acts as a latch and snaps into a circumferential groove 82 formed in the shaft 4I adjacent the outer projecting end thereof, by action of the sprig 8|, whereby the cam roller Illfis held indefinitely iiralignment with the cam I6 and the master cam 58 then becomes ineffective, by reason of the fact that the shift arm 55, as a result of the manual operation of the cam follower, is swung about its pivot 54 and the cam follower 51 is thereby carried away from the camming surface of ,the master cam 58.

When the cam I6 is to be reserved for the special purpose other designs to be produced in the stocking are confined to the cams I4 and I5, or to any other number of cams when a greater number is provided in the unit, but'in cases where all the cams of the unit are to be used selectively for .producing a continuous design the latch pin 80 may be 'kept from entering the keeper groove 82 by any suitable means, or in any suitable manner. As an example, the set fscrew 83 which holds the rod or shaft 4I rigidlyin the arms 42, 42

of the lever 44 may be releasedtto permit the shaft 4I to be moved outwardly beyond the maximum outward position attained by the pin- 8|),

after which the shaft 4I may again be locked by resetting of the screw 83. In this manner all the cams in the/unit'may be selectively employed in the formation of a predetermined design, in the stocking fabric.

The mechanism for shifting the main cam shaft I A of the machine, as shown in Fig. 1, is substantially the same as the shaft shogging motion of .the conventional knitting machine of the type noted and for this reason detailed explanation of the operation thereof is deemed unnecessary, except to state that the usual pattern chain is employed which carries the buttons usually employed to effect the operation of the shogging motion to shog the shaft when ordinary narrowing of the stocking is to be effected. "The said pattern chain 85 carries the usual narrowing i thereof is thereforedeemed unnecessary in the present case. v

If desired, the unit Acomposed of 'cams I4, I5 and I6 may be rotated by hand, in cases, such for example, as when for some reason or other,.

it is desirable to eliminate or nullify a portion of thepdesign determined collectively by the said plurality of cams, in which case a hand wheel is loosely mounted on the shaft vI3 and is held outwardly on said shaft against a stop head I 3a by a spring 9 I. The hand wheel 90 is provided with an inwardly extending finger 92, the free end of which is disposed substantially opposite and adjacent the teeth of the ratchet wheelv II, whereupon, by moving Uthe hand wheel `III) inwardly against the action of the spring 9| and said free end of the finger 92 engages one of the teeth of the ratchet wheel I 'I and locks the saidhand wheel to the ratchet wheel, whereupon rotationv f of the hand wheel 90 will rotate 'the ratchet wheel II and the cam unit operatively connected therewith in the manner above noted to nullify any desired portion of the sum total of the lengths of all the cam tracks I4, I5 and I6 as selectively thrown into successive use by the master cam 58 during one complete operating cycle of the said Vmaster cam. Upon releasing the hand wheel 90. the spring 9| will return said hand wheel to its outer inoperative position, releasing the finger 92 from the ratchet wheel I1 to permit normal operation thereof.

Of course, the improvements specifically shown and described can be changed and modified in variousways without departing from the invention herein disclosed and hereinafter claimed.

I claim:

1. In a straight knitting machine, pattern coni trol mechanism comprising a multi-cam-track unit, a cam follower, a master cam, means operable by said master cam for selectively correlating said cam follower with any one of the cam tracks of said unit, means for effecting actuation of the selective correlating means at a predetermined point in thepeod 0f correlation of the cam follower with a previously selected cam track foi` making a new selection, and means for withholding the cam follower from all of said cam tracks during the selection of one thereof.

2. Ina straight knitting machine, pattern control "mechanism comprising a series of. axially aligned disc cams, a cam follower mounted beyond the peripheries of said cams for movement laterally of said cams into a position substantially in the plane of any one of` said cams, `,a master cam, means cooperating with said master cam for rendering said master cam effective at a predetermined point in the rotation of the selected J cam.

3. In a straight knitting machine including a series of needles, a point bar arranged to dip toward the needles, a unitary pattern control mechanism including an axle supporting a series of pattern cams capable of unitary movement, a normally inactive control cam, also supported by said. axle, each said control cam and pattern" cams capable of movement relative to each other, and separate racks operating said pattern cams and said control cam, and deriving their actuating motion from the same source.

4. In a straight knitting machine, the combination with a mechanism for producing loops formed by the coaction between a point member and selected needles', of a compact unit control structure for said loop-forming mechanism adapted to be mounted on they dipping rod of said machine, comprising a plurality of cams, a cam follower, a master cam, and means operable by said master cam for selectively correlating said cam follower with any one of the said plurality of cams.

J 5. In a straight knitting machine, the combination with a mechanism for producing loops formed by the coaction between' a point member and selected needles, of a compact unit control' structure for said loop-forming mechanism adaptedto be mounted on the dipping rod of said machine, comprising a multi-cam-track unit, a cam follower, a master cam, means operable by said master cam for selectively correlating said cam follower with any 'one' of the cam tracks of said unit, and means for moving the cam follower out of camming engagement withr said unit during the selecting operation of said master cam. A

6. In a knitting machine having a 'series of needles, a dipping rod and a point rod arranged to dip toward the needles, a special loop-forming unit mounted on said dipping rod andcomprising pattern camsA having peripheral surfaces for progressive coaction with a follower for operating the point rod of said machine and collectively providing a cam track of greatervlength than the track of a single circular cam of equal average diameter, a master cam movable relative to the pattern cams, means actuating said pattern cams during the dipping motion of the narrowing mechanism of said machine, means for operating the master cam in predetermined relation to operation of the pattern cams, and

vmechanism including a follower responsive to operation of the mastercam for shifting the pattern-cam follower from one to another .of the pattern cams.

'1. In a knitting niachine Jhaving a-series of needles, a dipping rod and a point rod arranged" lectively providing a cam track of greater length than the track of a single circular cam of equal average diameter, a master cam movable relative to the pattern cams, means actuating said pattern c'ams during the dipping motion of the narrowing mechanism of said machine, and in- 1 cluding a pawl-and-ratchet device for actuating the pattern cams, means includingan element `on one of the pattern cams and a pawl-andresponsive to operation of the master cam for 'shifting the pattern-cam follower from one to another of the pattern cams.

'8. In a knitting machine, the combination with a loop-forming mechanism, of a cam unit adapted to be mounted on the dipping rod of said machine, including a plurality of cam structures, one` of said camy structures operating intermittently and the other of said cam structures operating in timed relation with respect to the rst cam structure; one of said camstructures including a plurality of cams, the camming surfaces of which constitute, in effect, peripheral sub-divisions of a single larger cam as related to a given pattern, a cam follower shiftable from one of said subdivisioncams to another, and means responsiveto operationl of the machine for shifting the follower between the subdivision cams of said one canrstructure in any desired,

Sequence 9. In a knitting machine, the combination with a loop-forming mechanism, of a control unit adapted to be mounted on the dipping rod of said machine including a Yplurality of cams cojoint.

of the cams in any desired sequence and to con-- trol said mechanism.

10. In a knitting machine, the combination with a loop-forming mechanism, of a unit control device adapted to be mounted onthe dipping rod of said machine including a support, la cam follower, a plurality of pattern cams, a master cam for controlling movement of the follower relative to the pattern cams, all of vsaid cams mounted on the same axis, and means on one of the pattern cams for controlling operation of themaster cam.

I1. A special loop-forming mechanism,` for a full-fashioned knitting machine, including pat tern cams having camming surfaces constituting in effect, perimetral subdivisions of a single r cam of substantiallygreater diameter defining a like pattern, a picot cam, a master cam movable relative to the pattern cams, means actuating said pattern cams and picot cam during the dipping motion of the narrowing mechanism of said machine, means for operating the master cam in predetermined relation to the operation of the pattern cams, means including a follower responsive to operation of the master cam for shifting the 'pattern-cam follower back and forth between positions inwhichl it is respectively operatively related to one of the pattern cams, and means for shifting the pattern cam follower to position 4cooperating with the picotcam.

Images