US2944496A

US2944496A - Work indexing mechanism

Info

Publication number: US2944496A
Application number: US701630A
Authority: US
Inventors: Edgar J Gardner
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-12-09
Filing date: 1957-12-09
Publication date: 1960-07-12
Anticipated expiration: 1977-07-12

Description

July 12, 1960 E. J. GARDNER WORK mosxmc MECHANISM 6 Sheets-Shet l INVENTOR E0698 Gaza/6e Filed Dec. 9, 1957 \\IIJIIII.E

July 12, 1960 Filed Dec. 9, 1957 E. J. GARDNER 2,944,496

WORK INDEXING MECHANISM 6 Sheqts-Sheet 2 mmvrok. 506/76 (1 GRGO/VEQ IZI prraeA/fx s July 12, 1960 E. J. GARDNER WORK mnsxmc MECHANISM 6 Sheets-Sheet 3 Filed Dec. 9, 1957 INVENTOR. 506/7? d. GFQOA/EQ July 12, 1960 E. J. GARDNER WORK INDEXING MECHANISM 6 Sheets-Sheet 4 Filed Dec. 9, 1957 INVENTOR, 506/78 GFEDA/EE July 12, 1960 E. J. GARDNER WORK INDEXING MECHANISM Filed Dec. 9, 1957- 6 Sheets-Sheet 5 Mam A 770NEV5 July 12, 1960 E. J. GARDNER 2,944,496

WORK INDEXING MECHANISM Filed Dec. 9, 1957 6 Sheets-Sheet 6 147 7 OQA/E f 2,944,496 WORK INDEXING MECHANISM Edgar J. Gardner, Santa Susana, Calih, assignor of small percentages to various assignees Filed Dec. 9, 1957, Ser. No. 701,630

1'7Claims. c1. HHS) This invention relates to. sewing machines, more particularly of the automatic. typei usedv for making buttonholes, and the present invention has particular reference to an automatic work. retaining and: feeding attachment for such machines.

One of the.- principal objects .of the. present invention is. toprovide a mechanism for attachment to sewingv ma.- chines of the automatic buttonhole-making type, which attachment. retains the work imposition on the machine and automatically presents to the sewing machine needle and its appurtenances successive, spaced portions: of the work for stepfby-steplmaking: of individual. buttonholes.

A further. object. of the. present, invention; is to. provide automatic: work. retaining andgfeeding. attachments for buttonhole machines, which attachments; make it possible more buttonhole: machines.

Patented July 12, 1960 Figure. 13. is. a fragmentary top plan view similar tov Figure l, but on an enlarged scale and illustrating a portion of the clutch actuating mechanism.

Figure 14- is a sectional elevation taken substantially on the line 1414 of Figure l.

Figure is a fragmentary side elevation, illustrating the work hold-down roller.

Referring now to the drawings, the attachment of the present invention is designed to be utilized in conjunction with conventional sewing machines designed to make buttonholes. Before. describing in detail the attachment of this invention, the salient features of the conventional sewing machine itself will be discussed briefly, and particularly those sewing machine parts and mechanisms operated by the. present attachment.

The, specific sewing machine so illustrated is constructed substantially in accordance with the disclosure of US.

i cooperates with a conventional shuttle 23 to form zigzag Still, another object. of the. present invention is. to pro- I vide a fullyautomatic and. wholly fool-proof: mechanism for retaining and: feeding: the work through a buttonhole stitches. f By means of a shiftable work clamp or presser foot. 24, the work is moved with respect to the needle so that. the stitches are arranged in two spaced rows, one row along 'eachside of the space which is isevered to provide the b-uttonhole aperture.

The sewing machine is mounted on a suitable table 25 to which is also secureda motor (not shown) .connected by a belt transmission'to drive the main shaft 26. The needle is operated through a clutch and stop motion assembly (not shown) operably connected to the driveshaft 26 within the housing 30. Operation of the clutch and stop motion mechanism is accomplished by means of a vertically reciprocable, spring-loaded pull rod 31. which carries a belt-shifting arm (not shown) and a spring loaded stop-plunger (not. shown). Depression of the pull rod moves the stop plunger out of en- ,gagement with a stop-cam (not shown) carried on the scription of, a preferred. embodiment thereof when. read in connection with. the: accompanying dra ingst In the. drawings.-:.

Figure 1 is. a. top plan view of a conventional but-ton hole. machine. having attached; thereto the; mechanism of Q the present invention, with. a portion of: the. buttonhole machine broken away. i

Figure 2, afragmentary view similar to Figural and illustrating the. work in place on theimechanism; 7 Figure. 3 is. a sectional. elevation taken substantially onthe line 37-3 of Figured- Figure 4 is. a. sectional elevation; taken the. line; 4-4 of. Figure. L 1 I Figure. 5; is. a sectional elevation taken substantially on the line 5-.,-5-.o Figure-1.. f f 7 g Figure 6.; is a sectional: 'elevationftaken; substantially on the line 6?-6.of' Figure l.

Figure 7- is a, fragmentary 'sectionaleleyatinn similar to Figure 3., but illustrating-the position of the. parts when the driving shoe is in the disengaged position Figure 8 is: a sectional elevation taken substantially on the line 8-8 of Figure 1.. v I

Figure 9 is a sectional. elevation taken substantially on the. line 9-9 of Figure- 3.. g V w Figure 10 is a sectional elevation taken substantially on the line 10-10 of Figure 3;

substantially on Figure 11- isa diagrammatic top plan view of the drive shaft and also engages the clutch mechanism thus causing the drive shaft to be driven by the motor and actuating the needle mechanism to begin the stitching operation. A latch lever (not, shown) is provided to engage thepull rod 31 and maintainthe clutch and stopmotion. mechanism in running position. The number of stitches which the machinewill make each time the clutch and stop-motion mechanism isshifted into running position depends upon the speed ratio at which a pattern cam. (not shown) isactuated. This cam serves to trip the latch lever and release the pull-out rod, thus automatically disengaging the clutch and stopping the sewing machine.

The pull rod '31 is conventionally depressed for operation of the machine by means of a foot treadle or knee shift. The present invention includes power means for automatically depressing this pull rod as will be fully explained hereinafter'and accordingly the foot treadle and/or knee shift are dispensed .With in use of the attachment of this invention.

The sewing machine is also provided with a buttonhole cutting mechanism which, for clarity of illustration, is

. not shown in the drawings.

The work clamp 24' includes an upper clamp jaw 40 which is carried by a lever 41 pivoted at 42 to the base 44 of the clamp. The'clamp jaw 40 is normally biased 1 into cloth gripping position by a spring 43 which engages the jaw 48. The lever 41 is engaged by a roller 45 care ried by a link 46 pivoted to a crank arm 47 fixed to a rotatably' mounted shaft 48. The crank arm is provided a u) with an extension 49 which is conventionally operably connected to a foot treadle or knee shift, but here again, these manually operated devices are dispensed with, the attachment hereinafter described including power means for controlling the operation of the Work clamp.

The attachment of the present invention includes a framework generally indicated 50 and comprising, in effeet, a pair of connected tables 51 and 52, one on either side of the sewing machine proper.

The attachment includes power means for controlling the operation of the work clamp, and as shown in the drawings, these means may include a solenoid 60 on the table 52 which actuates a rod 61 mounted for longitudinal reciprocation in suitable bearing blocks 62. The end of the rod remote from the solenoid carries a yoke 63 on which is journalled a roller 64 contacting the lower portion of a crank arm 65. The arm 65 is secured to a shaft 66 mounted for rotation in suitable bearing blocks 67. Also carried on the shaft 66 is a substantially horizontal crank arm 68 which is secured to the extension 47 by means of a spring 69. A pair of

micro switches

70 and 71 are pivotally mounted on the table 52 in positions to contact switch actuating

stop elements

73 and 74 respec tively. A pair of adjustably mounted collars 75 and 76 are provided on the rod 61 in positions to contact the respective switches 76 and 71.

Mounted on the table 52 on the other side of the rod 61 is a solenoid 78 operably connected to a spring-loaded bell crank 79, the crank being provided with a bulged end portion adapted to move into the space between the collar 76 and a third collar 76:: as shown in Figure l, the end of the crank being in contact with the collar 7 6a and functioning as a latch to prevent movement of the rod 61 to the left as seen in Figure 1.

Means are provided for power control of the pull rod 31 and hence also of the clutch and stop motion assembly. As shown in the drawings, these means may include a solenoid 80 on the table 51 which actuates a rod 81 mounted for longitudinal reciprocation in suitable hearing blocks 82. The end of the rod remote from the solenoid carries a yoke 83 on which is journalled a roller 84 contacting the lower portion of a crank arm 85. The arm 85 is secured to a shaft 86 mounted for rotation in suitable bearing blocks 87. Also carried onthe shaft 86 is a substantially horizontal crank arm 88 which is pivotally connected to the pull rod 31 as shown in Figure 1.

The rod 81 carries a pair of adjustable, spaced collars 89 and 911 which are adapted to actuate a toggle switch 91 mounted on a plate 92 on the table 51 on one side of the rod. Mounted on the underside of the plate 92 is a solenoid 93 operably connected to one arm of a springloaded bell crank 94 which is pivoted to the underside plate 92. The other arm of the bell crank is pivotally connected to a plate 5 slidably mounted on the plate 2, the connecting pivot pin 96 extending through a slot 97a in the plate 92. Pivotally connected to the plate 25 is a micro switch 97 which carries an actuator finger 98. A spring 99 connected at one end to the plate 92 and at the other end to the switch normally biases the switch out of contact with a switch actuating stop 1% provided on the plate 95. The switch finger 98 is adapted to be contacted by an adjustable collar 191 mounted on the rod 81. A spring 1112 extending between the collar 101 and the bearing block 82 serves to take any play out of the rod 81.

Means are provided for retaining or supporting the work in position on the sewing machine and as shown in the drawings these means may include a work-supporting table 116. The table, preferably of sheet metal, is generally horizontal and roughly U-shaped in plan, being provided with upstanding work-alignment portions 111 at the ends of each leg of the U and having an arcuate, downwardly-turned front edge 112. A pair of conventional, quick-acting, lever-type clamps 113 provided with elongated foot members 114 is secured adjacent each end of the table for retention of the work thereon.

Means are provided for mounting the table for longitudinal and transverse sliding movement. As shown in the drawings, the table is adjustably secured at either end, by means of the key slots 115 and the screws 116, to one of a pair of transversely

slidable support members

116a and 117. As seen in Figure 1, these support members are generally U-shaped in plan and are otherwise substantially. identical.

The support member 117 is mounted for slidable movement with respect to a block member 120, the block member being provided with a pair of rod supports 121 extending forwardly from the front side thereof, each extending through one of a pair of slideway bores 122 in the support member 117. Similarly, the support member 116a is mounted on the block member 124 which is provided with rods 125 extending through corresponding bores in the member 116a.

Means are provided for reciprocating the

support members

116a and 117, and hence also the table 110 and the work, simultaneously with and to the same extent as the conventional transverse'reciprocatory movement of the work clamp 24, Le, movement in the directions of the arrows of Figure 5. As shown in. the drawings, these means may include a pin carried on a vertical plate 131 secured to a horizontal plate 131a which in turn is secured to the reciprocating clamp base 44. Pivoted at one end to the pin 130 is a lever 132, the other end of which is pivotally connected to the upper end of a crank arm 133 (see especially Figures 5, 8 and 9). The lower end of the arm is carried on a rotatable shaft 135 which extends completely across the entire framework 50, being journalled in the end plates 136 and 137' and in the

intermediate support plates

138 and 139. Turning of the shaft in response to movement of the lever is transmitted into identical movement of the support member 117 by means of a pair of crank arms carried on the shaft, one adjacent the intermediate support plate 139 and the other adjacent the end plate 137. Each of the arms 140 is pivoted at its upper end to a rod which terminates short of the plates 137 and-139 and which extends through a longitudinal slot 146 in the upper portion of the support member 117 (see Figures 3, 4 and 7), the slot being provided with a pair of guide rods 148 to transmit the arcuate movement of the rod 145 into horizontal planar movement of the support member. Similarly, the shaft 135 carries a pair of crank arms 150 which are pivoted to a rod 151 which engages in an identical slot in the support member 116a.

Means are provided for intermittently moving the table longitudinally in synchronization with the operation of the needle and work clamp mechanisms for step-by-step feeding of the work and the automatic production of any desired number and spacing of buttonholes on the work. As shown in the drawings, these means may include a motor provided with a belt transmission 16.1 for continuously driving a lead screw 162. The screw extends completely across the right-hand side of the framework and is journalledin suitable bearings in the end and support plates 137 and 139. As shown best in Figure 10, the screw extends through an oversize aperture 163 in the block member 120. i

As seen best in Figures 9 and '10, the block member 120 is formed of two identical parts joined in spaced rela tion by means of a bushing 165 and a spacer 166. The member 120 is supported for longitudinal sliding movement on the framework by means of a pair of rods 17%) and 171, the rod 17% extending through the bushing 165 and the rod 171 extending through a slot 173 extending upwardly in the block member. The

block members

120 and 124 are rigidly tied together by means of a 'rnent, with respect to. the lead screw-162 is a shoe, member uengageable with the and as .shown. in .the. drawings, particularly Figure 3'; these means. may include..a ,pai'r of; mutually opposed solenoids 184.and.1 85, each connectedjby eans of a pivot pin 186 to. aJever. 7; pivot d. atthe ow r nd' hcre f e plate...132, andpivqtedatthenupper endlthereof to one end of agenerally. hqrizontalgarm 19 The I 190 is pivotany. connected. at. thel therl e d: to the pp n j f. a afi arm. 1 91 w ic tis arri d na, ha t 92 xt nd between and journalled in the

end plates

131 and 139. Carried on.the.shaft-,19 2,is a pair of crank 193' and 194. whi h. s pp r a. od .5 xt ndi g. lon itud n y ofith firam work jus short of. h lp ates .7. n 9,

The. shattf. 1 92, operates between-a pair ofc placed pins 196 .and '.19,7 carriedonihe rearwallof th yohez n m r 181 (compareFi'gurcs. 3. and, 7)..-

1 oiitof contacit with th eeuar'm. This permitsthework The...shoe'.180,isresiliently. latched iii the. engaged and V disengaged; positions by means. of a spring-lcfilded latch rod 198, the lower .end of which is adapted to seatin a t.- '9. inthenpper. endc thc 1e t187. h pp end of the..rqd-extends th1' ough a tapered opening'19 8a inan L-shaped.bracketJ198b- Hold-,down means, are provided for maintaining the proper. position of thework as. it passes under the work clamp 14. Thesemeans may include a canted roller 200 which becauseloi therangle of inclination of its axis. of retati'onas seen in Fi'gnres 2 and-15, tends to pull, the work towardthe,sewingmachine, i;e., to,the left asseen in:,l.igure l5. Asushown theroller 200 ismounted for freerotationsof. an,L.-shapedbracke.t 201 Whichis pivotally connected to a block 202 secured to'the stationary sewing. machine base 2031-.v A spring 204.. biases the roller. into contact withfthe work.

The. means for initiating control; or. the. intermittent longitudinal motion of, the tablelll), includes a plurality of micro switches 210 adjustably. spaced on, their-amework a distancesapart exactly? equal to the desired spacing of the buttonholesto be. made inthework. Eachof the switchesjs mounted on atrack formedby apairof spaced bars1 .212,,extending betweentheplates137 and.1;39, each switch. e n sl a' ablu ecured h tobr m ans ,of, a bolt 214. A ruler 215 or other appropriateindexing deyiceis, mounted on oneof the. bars 212. for assisting he. selective positioning of the, switches Each, switch. is provided with a spring actuator 220, a;nd,-arn L.-sh aped limit bracket 2,21.

The. switches are. actuatcd. by a generally. 'L-shaped 23,0 .pivotally connected -to the yoke member; 181

as. e t seen in; Figures ,7, 9.. and. 1.4., A. spring. 231

normally'holds the arm 230 in the position. shown, against a. stop: 232, butpermits deflection: of.- the; arm afteil initial. contact, with, the. switch actuator. 2201.

A, steppedswitch.

actllhim

2,4,0 (Figure 9). is! adjust-ably secured. to the. block 120, inposition to actuate the. roller switch

arms

241, 242... and 243 of the, switches; 244, 245 and 2516, upQn completion. of travel of the. table 11.0. The functions of these switches, will be-described below,

In operation of the attaclnnent. of this invention, the

operator. first, clamps the work, such as the shirt-250, on

thetahle 1 10, It will be understood that for. maximum efiiciency t-heoperator'will. be tending atleasttwo such w n ch n and ta ment as mb es Seth-at: h other; machine or machines will be ingbuttonhole-making to the left as shown in Figure 12. this operati' gn, the collar 75 trips the s'witch 7.0 which is cbnnected to the solenoid 80; thus energizing the solenoid and moving-the rodS lto theright. This causesthepullmd 31; to bedepressed, by means of the'rods actuation of the crankarrn SS and in turn the arm 88.; thus engaging the clutch, disengaging the stop inotionmechanism'andcausing the sewingto begin. v i Y As fthefrod 81 moves totheleft the collar 9tl moves the toggle of the switch9 1 fromthe oiFto the on-pos itiong' This switch is connec tedto the solenoid" 8Qandby the time the rod' 8 1 has moved from the extended posi tion of Eigure .1'3 to,the retracted position of Figure; 1 1 the toggle switch is on and tie-energizesth solenoid: This has no effect" upon the; position offthe'rod18 1, however, since sewing is. still going jon, the pull rqd 31 being locked in the depressed position. Thisinetfe'ctlocks the, rod 81 against movement from the position of Figure 11;. It wilLalsobe seen from a; comparisonofi Eigures ,l' 1 andj} thatthe collar 1&1 has moved to the left with the rod; thus permitting t he switch 97' and its plate 95 to n oye side of the collar 101'.

Upon completion of the sewing cycle for the first b uttonhole the pattern cam mechanism automati leases the pull rod 3110 the original extended p tion This, through the crank arrn' assembly describ "above;

moves the rod' 81; baclgto the right to the position of; ures'l and 1 3, in so doing' the collar 191' movesthe'finger 98 andthe switch 97 pivots into contact with thejstop; 1'60;

'thustripping the switch. This switch is connected togthe solenoids 60'and-18'4 and hence energizes these solenoids;

The solenoid 60 then pulls the rodftil and its appurte names to the right from the extended position offEigure 12 to the original position of Figure 1. This p ulls' 'the 'work clamp 24' up out of-contact with the work and the latch crank 79 re-engages the collar 76a to hold-the wprk clamp in this position. The energization of the solenoid 184 causes the lever 190 and crank 191- tomove to the left from thepositionof'Figure 7'to' the-position ofFig} ure 3. At the same-time the free endoffthe crankar'm 193 is moved downwardly, pivoting; the yokej18 1- to bring the sh'oelBti into: engagement with thecontinuously-turndescribed in'the. above paragraph,'thecollar 76 'trips the and thus energizes. it to cause it to move: the-bell crank ing. lead screw 162-and thuscausingthetahle lltl andthe work tobefed to the right'as seen in Figures 1 and 2 As the rod: 61' completes the movement to the right switch; '71; This. switchis connected'toL -the solenoid 93 94. which. in turn'pulls: the switch '97 back to theopen position of Figure 13, thus de-energizingthel solenoids fifi a'nd right until-the arrn;=230 trips th'deft-most: (as seen in a Figure. 1%) switch 210'. This switch; being connecte'di' to the. Solenoids.7*8i-and185 energizes bothv solenoids soltha't sirnultaneously'the latch '79 is releasedto start the. entire cycledescrihedabove, and thelshoe:180 isJdisengaged to nection withthe operation of the. solenoid; 184 except that e the motions areexactly the reverse;

operation duringthislclamping step. Eollowing-theelamp- It will beunderstood that the above} cycle is. repeated a number of tlmes equal to, the remaining number: of

switches 21!), After the last switch 2-10; has. been, tripped and; the; cycle repeated; for thelast time. to make. thelo'wer nost; huttonholeon, the, shirt, the, stepped; switchfactuates r ns. n seqiwncesw ches, 2.44., 2. 5 andi246; Normal xclgssdtswi ch. zetcluts-cfi; Ih PQnen-su I mitQe solenoid 78, normally open switch 245 rte-energizes the solenoid 185 to disengage the shoe 180, and normally closed switch 246 cuts oif all power supply to the attachment.

The completed work is then removed from the table 110, the table is moved by hand back to the starting position, and the entire operation is repeated.

It is to be understood that the conventional work clamp 24 shown and described herein reciprocates, when in the depressed position, in a path defined herein as transverse. to move the portion of the work which is under the needle in the desired manner to produce the buttonhole stitching. Those skilled in the art will understand that this is not wholly linear motion, and that at the ends of the buttonholes, the clamp moves a slight amount in a direction substantially normal to the buttonhole so as to permit stitching of two rows of stitches. This slight normal motion is not transmitted to the table 110, being taken up in the resiliency of the work itself.

Although not shown in the drawings, it is to be understood that automatic clamping means may be substituted for the manual means shown, or the clamps shown may be modified to render them automatic or semi-automatic in operation. For example, a cam or cams may be mounted on the framework and operably connected to the clamps 113 to cause their automatic opening at the end of the operation and automatic closing at the start thereof.

, ,It is to be further understood that the attachment of the present invention is readily adapted to be attached toany standard type of sewing machine adapted to the making of buttonholes. A slight modification of the attachment shown and described above would be required for use of the attachment with the Reese typeof machine such as is described in US. Patents Nos. 488,028, 494,280, and 713,764. Inasmuch as this type of machine does not utilize the pull rod 31, the control means for the rod 31 shown and described herein would not be required.

Having fully described my invention, it is to be understood that I do not wish to be limited to the details set forth, but my invention is of the full scope of the appended claims.

I claim:

1. In a buttonhole making machine of the type having a needle and a co-operating work clamp reciprocable in a transverse direction, an attachment, in combination with said needle and work clamp, including means for supporting the work in operative position with a portion thereof under said work clamp, means for moving said work supporting means simultaneously with and in a path duplicating the transverse movement of said work clamp, and means operable in timed relation with said needle and said work clamp for intermittently feeding said work supporting means longitudinally past said work clamp for the automatic production of a plurality of button holes in said work.

2. In a buttonhole making machine of the type having a needle and a co-operating work clamp reciprocable in a transverse direction, an attachment, in combination with said needle and Work clamp, including means for supporting the work in operative position with a portion thereof under said work clamp, means for moving said work supporting means simultaneously with and in a path duplicating the transverse movement of said work clamp, means for feeding said work supporting means in a direction substantially normal to said transverse direction past said work clamp, and means for intermittently stopping said feeding means in timed relation with the operation of said needle and work clamp to successively pre- "sent thereto spaced areas of the work for the automatic production of a plurality of buttonholes therein.

3. In combination with buttonhole making machines of the type having a needle, a clutch and stop motion mechanism for said needle, and a co-operating work clamp reciprocable in a transverse direction, an attachment comprising means for supporting the work in operative position with a portion thereof under said work clamp, means for power controlof said clutch and stop motion mechanism, means for power control of said work clamp in timed relation with said clutch and stop motion mechanism, means for moving said work supporting means simultaneously with and in a path duplicating the transverse movement of said work clamp, and means operable in timed relation with said needle and said work clamp for intermittently feeding said work supporting means longitudinally past said work clamp for the automatic production of a plurality of buttonholes in said work.

4. In combination with buttonhole making machines of the type having a needle, a clutch and stop motion mechanism for said needle, and a cooperating work clamp reciprocable in a transverse direction, an attachment comprising means for supporting the work in operative position with a portion thereof under said work clamp, means for power control of said work clamp in timed relation with said clutch and stop motion mechanism, means for moving said work supportingmeans simultaneously with and in a path duplicating the transverse movement of said work clamp, and means operable in timed relation with said needle and said work clamp porting means simultaneously with and in a path duplicating the transverse movement of said work clamp, and means operable in timed relation with said needle and said work clamp for intermittently feeding said Work supporting means longitudinally past said work clamp for the automatic production of a plurality of buttonholes in said work. I

6 The combination of claim 1, wherein the work clamp includes a base and wherein the means for moving said work supporting means includes an arm operably connected to the base at one end and to the work supporting means at the other end.

7. The combination of claim 1, wherein the feeding means includes a continuously turning lead screw.

8. The combination of claim 1, wherein the feeding means includes a continuously turning lead screw and a threaded shoe member releasably engageable with said lead screw.

. 9. The combination of claim 1, wherein the work supporting means includes a table and a clamp mechanism on said table.

10-. The combination of claim 1 wherein the work supporting means includes a spring-loaded canted roller mounted on the machine and contacting the work to exert a component of force thereon'in a directiontoward said work clamp. Y

11. The combination of claim 1, including a framework, wherein the work supporting means includes a table, a pair of table supporting members, means adjustably connecting said table to said supporting members, and a pair of block members operably connected to said framework, said table supporting members being slidably mounted on said block members.

12. The combination of claim 11, wherein said framework is provided with a plurality of elongated support rods and said block members being provided with openings through which said rods pass for sliding movement of said block members with respect to said framework.

' 13. In a buttonhole making machine of the type having a needle and a cooperating work clamp reciprocable in a transverse direction, an attachment, in combination with said needle and work clamp, including a framework; means for supporting the work in operative position with a portion thereof under said work clamp, said means including a table; a block member operably connected to said framework for movement in a direction substantially perpendicular to the transverse movement of said work clamp; means on said framework for intermittently moving said block member in said direction; a table supporting member operably connected to said block member for reciprocable movement in directions substantially parallel to the transverse movement of said work clamp, said table being rigidly connected to said table supporting member; and means for moving said table supporting member simultaneously with and in a path duplicating the transverse movement of said work clamp. I

14. In a buttonhole making machine of thetype'having a needle and a cooperating work clamp reciprocable in a transverse direction, an attachment, in combination with said needle and work clamp, including a framework; means for supporting the workin operative position with a portion thereof under said work clamp, said means: including a table; a pair of block membersoperably connected to said framework for movement in a direction substantially perpendicular to the transverse movementrof said work clamp, one of said block members being positioned on either side of said work clamp; means on said framework for intermittently moving said block members insaid direction; a pair of table suppor-ting members, one

operably connected to' each of said block members for reciprocable movement in directions substantially parallel to the transverse movement of said .work clamp, said table being rigidly connected to said'table supporting a needle and a cooperating work clamp reciprocable in a a transverse direction, an attachment, in combination with said needle and work clamp, including a framework; means for supporting the work in operative position with a portion thereof'under said work clamp, said means including a table; a pair of block members operably connected to said framework for movement in a direction substantially perpendicular to the transverse movement of said work clamp, one of said block members being positioned on either side of said work clamp; means on said framework for intermitte'ntlymoving said block members in said direction; a pair of table supporting members, one operably connected to each of said block members for reciprocable movement in directions substantially parallel to the transverse movement of said work clamp, said table'being rigidly connected to said table supporting members; and means for moving said ,table supporting members simultaneously with and in a path duplicating the transverse movement of said work clamp, said last named means including an operative connection between said table supporting members and said work clamp.., g

members; and means formoving; said table supporting members simultaneously with and in a path duplicating the transverse movement of said workrclamp.

15. The combination of claim 14, wherein said framework is provided with a plurality'of elongated support rods, said block members being provided with openings through which said rods pass for "sliding movement of J said block members with respect to said framework.

16. The combination of claim 14, wherein said framework is provided with .a plurality of elongated support rods, said block members beingprovided with openings if References Cited in the file of this patent UNITED STATES PATENTS 593,577 Hawes Nov. 16, 1897 594,290 SchWarz' Nov. 23, 1897 1,243,679 Allen Oct. 23, 1917 1,466,486- Schloss Aug. 23, 1923 1,492,084 Ray Apr. 29, 1924 1,569,394 Ray Jan. '12, 1926 2,373,784 Schloss Apr. 17, 1945 2,465,232

Jones et a1. Mar. 22, 19,49