US2681629A - Worktable tilting mechanism for blindstitch sewing machines - Google Patents

Description

F. PARRY 2 WORKTABLE TILTING MECHANISM FOR BLINDSTI'I'CH SEWING MACHINES June 22, 1954 3 Sheets-Sheet 1 Filed June 7, 1952 ATTORNEY June 22, 1954 Fr PARRY 2,681,629

WORKTABLE TILTING MECHANISM FOR BLINDSTITCH SEWING MACHINES Filed June 7, 195g 3 Sheets-Sheet 2 INVENTOR. film)?" (Pam/y BY t z: I 4

ATTORNEY June 22, 1954 F. PARRY 2,681,629

WORKTABLE TILTING MECHANISM FOR sunns'mcu SEWING MACHINES Fiied June 7, 1952 s sheds-sheet s INVENTOR. $0M? Wang BY ATTORNEY Patented June 22, 1954 UNITED STATES ATENT OFFICE WORKTABLE TILTING MECHANISM FOR BLINDSTITCH SEWING MACHINES Application June 7, 1952, Serial N 0. 292,261

16 Claims. 1

This invention relates to blind-stitch sewing machines and it has for its main object to pro vide improved means for controlling the elevated position of the work-table, whereby the machine may be adjusted to produce blindstitches in materials having a wide range of thicknesses.

Another object of the invention is to provide an improved work-table tilting mechanism adapting the machine for producing either continuous anchor-stitches or alternate anchorstitches and skip-stitches.

Still another object of the invention is to provide an improved work-table tilting mechanism having means for determining the normal elevated or anchor-stitch work-presenting position and the lower or skip-stitch work-presenting position of the work-table, said means being constructed so that once the differential between these two positions is determined the initial position of the work-table may be changed without affecting said differential.

A further object of the present invention is to provide a manually controlled abutment-stop,

whereby a micrometer adjustment of the normal working position of the work-table can be eifected.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings:

Fig. 1 is a top plan view of a machine constructed in accordance with my invention, the bed cover-plate bein removed and certain of the parts being in section better to illustrate the details of the machine.

Fig. 2 represents a vertical sectional view taken longitudinally of the base and through the standard and the Work-table, illustrating the work-table tilting mechanism and a portion of the throw-out therefor.

Fig. 3 represents a front elevation of the macl1ine-standard with the cover-plate therefor re moved and the machine-base and certain of the mechanism extending longitudinally thereof in section to illustrate the drive for the skip-stitch mechanism. 1

Fig. 4 represents an enlarged horizontal sectional view taken substantially along the line 4-4, Fig. 3, showing the eccentrically bodied skipstitch spindle and a portion of the manually actuated connections for effecting a turning adjustment thereof.

Fig. 5 represents an enlarged vertical sectional view taken substantially along the line 5-5, Fig. 2, showing the pivotal support for the worktable and the manually retractable throw-out rod for rendering the skip-stitch mechanism inoperative.

Fig. 6 represents an enlarged vertical sectional view taken transversely of the work-table adjacent the stitching point to illustrate the relation of the ridge-forming element with the presserplate and the stitch-forming devices.

Fig. '7 represents a vertical sectional view taken longitudinally of the free end of the machinebase, showing the linkage connecting the worktable elevating spring to the work-table.

Fig. 8 is a perspective view of the skip-stitch mechanism, together with the work-table elevating coil-spring and the linkage for connecting said coil-spring to the work-table.

Referring to the accompanying drawings, the improved sewing machine includes a frame comprising a base or base-arm l0 having a hollow standard I! rising from the rear right hand corner thereof. Extending laterally towards the left'from the upper end of the standard is a horizontal upper arm I2, and extending forwardly from the left hand end thereof is a frame-arm i 3. Attached to the free end of the arm is a stationary presser-plate or foot [4 against which the work is clamped by a pair of conventional vertically yieldable work-clamping members 15 carried by a work-table [6 which is supported by the base-arm ill.

Journaled in the horizontal upper arm i2 is a main rotary shaft I! which, through the usual connections disclosed for example in the U. S. patent of Dearborn, No. 705,325, July 22, 1902, oscillates a needle-shaft [B which is jlournaled in the forwardly extending arm 13. Carried by the forward end of the needle-shaft I8 is a curved needle 59 which oscillates directly above the presser-plate M and in a path transverse to the longitudinal axis thereof; the forward or work-penetrating stroke being from left to right. Cooperating with the needle in the formation of chain-stitches is a looper 2G actuated, in the manner shown in the U. S. patent of Dearborn, No. 639,669, December 19, 1899, from the mainshaft ii. The work is fed rearwardly past the needle i9 by means of a four-motion feed-dog 2! which operates through a hole in the presserplate l4 and in opposition to the vertically yieldable work-clamping members l5, all in the manner substantially like that disclosed in the U. S. patent of Dearborn, No. 1,592,446, July 13, 1926.

The work to be stitched is supported on the work-table [6 which is formed at its free left hand end as a tube or horn beneath the stitching and feeding mechanisms and at its right hand end is enlarged into substantially rectangular form having a convex upper surface 22 (Fig. 2), and a pair of depending end- walls 23 and 2% (Figs. 1 and The end walls 23 and 2d are preferably bored to receive the opposite ends of a horizontally disposed pivot-rod or shaft 25 journaled in upstanding lugs 28 and 2? which are integral with a bracket 28 detachably secured by screws 29 to the base Iii.

The work-table it provides supporting means for the usual ridge-former 39 (Fig. 6) which functions in cooperation with the presser-plate It to form a bight in the material facilitating the penetration of the material by the curved needle is so as to form blind-stitches. It will be understood that the material is bent or ridged as it is fed over the ridge-former 3i] and in order to minimize the friction imposed on the material by the ridge-former during this bending action, the ridge-former is oscillated in the line of feed in a manner such that its forward movement is timed to coincide with the work-advance movement of the feed-dog 2|. As will be seen in Figs. 1, 2 and 6, the ridge-former 38 is preferably clamped upon the outer end of a ridgeformer carrying shaft 3! journaled in the worktable It and having secured to its inner end a rock-arm 32, The rock-arm 32 is connected by a link 33 to the upper end of an upstanding rock-lever 34 secured on the exposed end of a pivot-shaft 35 journaled in one of the side walls of the base Ill. Preferably clamped to the inner end of the pivot-shaft 35 is a downwardly extending rock-lever 36 connected by a pitman 3? to an eccentric 38 mounted on the main-shaft ll. Rotation of the main-shaft i! will impart to the ridge former 3i] oscillations about the axis of the ridge-former carrying shaft 3! in timed relation with the stitch-forming and work-feeding mechanisms.

As previously described, the work-table H3 is supported on the pivot-shaft 25 and is springbiased, by means later to be described, into an elevated work-presenting position. This workpresenting position in the present machine is determined by means of a manually controlled work table height-adjusting device located in the machine-base It and controlled by a thumbdisk located on the upper part of the standard 1 within easy reach of the operator. The worktable height-adjusting device is best shown in Figs. 1 and 2 and comprises a stop-rod 39 endwise slidable in a thickened front wall 49 of the base it], with its outer or exposed end arranged to be engaged by an adjustable stop-screw ii threaded into the depending front apron 42 of the work-table it. The inner end of the stop-- rod 39 is secured; as by brazing or the like, to an arched offset head 43 fitted with a horizontal pivot-pin 44 embraced by the forward end of a pitman 65 having its other end enlarged to brace the eccentric body-portion t6 of a skip-stitch or pivot-spindle 4'1 mounted for limited turning adjustment in the side walls of the standard M. It will be understood that a slight turning of the skip-stitch spindle 5'! will cause its eccentric body-portion 45 to impart a small move ment to the pitman 45, which in turn will slide the stop-rod 39 in or out and thereby affect the elevation of the work-table relative to the stitching mechanism. Turning of the skip-stitch spindle 41 is accomplished by means comprising a lever-arm 48 preferably clamped by a screw 39 upon the skip-stitch spindle 4'. (Figs. 2 and 4). Pivotally connected to the end of the lever-arm 48 is the lower end of a link 50 which is preferably bifurcated at its upper end to straddle and pivotally support a traveling-nut 55 into which is threaded an adjusting stud 52 rotatably journaled in an upwardly inclined portion 53 of a cover-plate 54 detachably secured and closing the front wall of the machine-standard H. The exposed end of the adjusting stud 52 is squared, as at 55, and projects into a thumbdisk 56 locked on the adjusting stud 52 by a cap-screw 51 threaded into the adjusting stud. The thumb-disk 56 is scribed adjacent its periphery with indicia disposed to cooperate with a fixed pointer (not shown) on the machineframe in order to facilitate setting the worktable 6 to its proper elevation. It willbe appreciated that a manual turning of the thumb disk 55 will effect a rise or fall in the elevation of the work-table It, the traveling-nut 5i on the adjusting stud 52 being irreversible so that no additional locking means is necessary for maintaining the work-table in its selected position of adjustment.

In blind-stitch machines of the type illustrated in the drawings, it is common to equip them with skip-stitch mechanism by which the machine can produce skip-stitches as well as anchor-stitches. Skip-stitches are produced in the present machine automatically by periodically tilting the work-table so that its free end moves for a limited extent in a direction downwardly or away from the stitching mechanism. The skip-stitch mechanism, best shown in Figs. 2, 4 and 8, includes an endwise reciprocatory plunger indicated generally as 58; The plunger 58 is journaled in the thickened front wall 45 of the machine-base l0 and is connected at its rear end to one end of a pitman-connector 58 suitably formed at its other end to embrace a needle-bearing 69 mounted on a skip-stitch eccentric Bi preferably formed integral with a beltsprocket 52 journaled on the eccentric bodyportion 46 of the skip-stitchspindle M. The belt-sprocket 62 is driven by a clip-belt 53 from a smaller belt-sprocket 66 secured on the mainshaft ll. Rotation of the main-shaft ll imparts to the skip-stitch eccentric 6! rotary motion at one-half the speed of rotation of the shaft H, and the skip-stitch eccentric through the pitman-connector 59 imparts an endwise reciprocation to the skip-stitch plunger 58. Opposing the plunger 58 is an adjustable abutment-screw which is threaded into the depending apron 42 of the work-table E6.

The skip-stitch plunger 58, as it is reciprocated,

strikes the abutment-screw 65 and swings the work-table 16 about its pivot 25 in opposition to a yielding force imposed by a work-table elevating coil-spring 66 which acts between the pitman-connector 59 and the work-table apron 42. As will be seen in Figs. 2 and 8, the coil-spring 66 at its inner end is hooked to a cross-pin 6'! provided in a spring-connector 68 freely journaled on a spring-tension-regulating screw 69 threaded into the offset rear end 10 of the pitman-connector; access to the spring-tensionregulating screw 69 being had through an openis turned the eccentric'bodied skip-stitch spindle 4'! is turned and, as a result of the eccentric body thereof, the center distance between the spindle 41 and rotary shaft I1 is changed. This change in center distanceis very small and can readily be accommodated by the clip-belt 62.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a blind-stitch sewing machine, a main frame having a base, a standard and an overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, an actuating shaft journaled in said main frame, an actuator driven by said shaft, work-table moving means providing for moving said work-table in one direction relative to said overhanging arm and including a member operatively connected to said actuator, and means acting in opposition to said Work-table moving means including a spring op eratively connected at one end to said work-table and at its other end to said member,

2. In a blind-stitch sewing machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-present ing position of said work-table relative to said stitch-forming mechanism, an actuating shaft iournaled in said main frame, an actuator driven by said shaft, Work-table moving means providing for periodically moving said work-table in a direction away from said stop and including a member connected to said actuator, and a spring operatively connected at one end to said work-table and at its other end to said member to bias said work-table toward and into contact with said sto 3. In a blind-stitch sewing machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-presenting position of said work-table relative to said stitchforming mechanism, a rotary shaft journaled in said main frame, an eccentric driven by said ro tary shaft, work-table moving means providing for moving said work-table in a direction away from said stop and including a member embracing said eccentric, a spring operatively connected at one end to said work-table and at its other end to said member to bias said work-table into contact with said stop, and means for regulating the pressure exerted by said spring.

4. In a blind-stitch sewing machine, a main frame having abase, a standard and an overhanging arm, and stitch-forming mechanism in said overhangin arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, stop for determining the elevated work-presenting position of said work-table relative to raid stitch-forming mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, work-table movin means operated by said actuating shaft and providing for periodically moving said work-table away from said stop in opposition to said spring, said work-table moving means including a reciprocatory plunger movable into and out of engagement with said worktable and comprising two interconnected sections having relatively extended and contracted positions, and manually operated means providing for shiftin said plunger sections from their relatively extended position in which said plunger periodically engages said work-table to their relatively contracted position in which said plunger does not engage said work-table.

5. In a blind-stitch sewing machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-presenting position of said work-table relative to said stitch-forming mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, worktable movin means operated by said actuating shaft and providing for periodically moving said work-table away from said stop in opposition to said spring, said work-table moving means including a reciprocatory plunger movable into and out of engagement with said work-table and comprising telescopically arranged inner and outer sections having relatively extended and contracted positions, and means providing for at will relatively shifting said plunger sections from their extended position in which said plunger periodically engages said work-table to their contracted position in which said plunger does not engage said work-table.

6. In a blind-stitch sewin machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhang-ing arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-presenting position of said Work-table relative to said stitch-forming mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, work table moving means operated by said actuating shaft and. providing for periodically moving said work-table away from said stop in opposition to said spring, said work-table moving means including a reciprocatory plunger movable into and out of engagement with said work-table and comprisin two interconnected sections having relatively extended and contracted positions, and cam means in operative engagement with each of said plunger sections and operable to relatively move said plunger sections from their contracted to extended position.

7. In a blind-stitch sewin machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-presenting position of said work-table relative to said stitch-formin mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, worktable moving means operated by said actuating shaft and providing for periodically moving said work-table away from said stop in opposition to said spring, said work-table moving means includin a reciprocatory plunger movable into and out of engagement with said work-table and comprising telescopically arranged inner and outer sections having relatively extended and coning ll closed by a screw-plug 12. As will be seen in Figs. 7 and 8, the front end of the coil-spring 66 is secured to the inner end of a slide-rod 13 supported in the end-wall 4c of the base It! and connected at its outer end by a short link 74 to one side face of a rock-member 75 which is pivotally mounted on a stud l6 threaded into the upstanding lug 26 (Fig. 5) of the bracket 28. Connected to the other side face of the rockmember 2'5 is a link H connected to the depending apron 42 of the work-table E6. The linkage, including the slide-rod l3, rock-member l5 and links M and 71, provides means such that when the work-table is lowered by manual actuation of the usual knee-shift, the effort required by the operator becomes less as the work-table approaches its lowered position. This feature is fully described and claimed in another of my U. S. patent applications, Serial No. 292,264, filed herewith and reference may be had to that application for a more complete description of the same.

From the foregoing, it will be appreciated that the normal elevated work-presenting position of the work-table is determined by the position of thestop-rod 39 and the selected position of adjustment of the stop-screw 4|. It will be further appreciated that the work-table I6 is biased about ,its pivot so that the stop-screw 4! is maintainedagainst the end of the stop-rod 39 by the coil-spring 66 which acts between the pitmanconnector 59 and the apron 42 of the work-table [6. the pitman-connector 59 and the work-table it, rather than between the base I S of the machineframe and the work-table, the tension developed by the coil-spring 66 is not transmitted to the skip-stitch eccentric 81, which additional tension or pressure would increase the friction at the bearing points between the pitman-connector 59 and the eccentric Bl thereby increasing the wear on the parts.

In order that the machine may be adjusted to sew either continuous anchor-stitches or anchorstitches and skip-stitches, throw-cut means are provided whereby the endwise reciprocatory skipstitch plunger 58 can be rendered ineffective or effective in tilting the work-table it. In the present machine, the skip-stitch plunger 58 is adapted to reciprocate through a fixed amplitude which depends upon the eccentricity of the skipstitch eccentric 6|. Throw-out of the skipstitch mechanism is accomplished by shortening the length of the skip-stitch plunger 58 so that it falls short of contacting the abutment-screw during its reciprocatory movement. The throw-out device is best shown in Figs. 2, 5 and 8, and comprises arranging the skip-stitch plunger 58 in two telescopically arranged parts, an outer tubular section or sleeve 78 which is connected directly to the pitman-connector 59 and an inner section or plunger I9 disposed to directly engage the abutment-screw 65. The inner plunger i9 is journaled in the outer sleeve member 18 for both turning movement and endwise sliding movement. As will be seen in Fig. 2, the bore of the outer sleeve member 78 is enlarged to provide clearance for a compression spring 8!! which acts between a'shoulder on the shell member and the head of a cap-screw 8| threaded into the end of the inner plunger '39 for the purpose of biasing the outer and inner members of the skip-stitch' plunger toward each other into their contracted or telescoped position. Mounted on the inner plunger member '39, adjacent its exposed end, is a collar 82 having an inclined cam face 83 which Inasmuch as the coil-spring 66 acts between 7 is yieldingly biased by the coil-spring into engagement with the pointed end of a projection 84 extending from the proximate end-face of the outer sleeve member 18. The collar 82 has cut into its periphery suitable, gear teeth 85 which are in mesh with a rack 86 out into the bottom of an endwise slidable throw-out rod 81 journaled in the bearing lugs 26 and 21 of the bracket 28. The throw-out rod 81 at one end is provided with a hand-knob 88 and at its other end is fitted with a stop-collar 89 which limits the retracting of the throw-out rod. Turning of the throw-out rod '82 is prevented by a guide-screw 90 (Fig. 5) whose reduced inner end enters a narrow guide-groove a: formed in the throw-out rod. From the foregoing, it will be obvious that with the inner plunger 19 and the outer sleeve member 18 of the skip-stitch plunger 58 locked in their relatively extending position, determined by the projection 84 seated in a detent notch 92 formed in the cam face 83 of the collar 82, rotation of the skipstitch eccentric 5| will impart an endwise reciprocation to the composite skip-stitch plunger 58, which plunger 58 will periodically engage the abutment-screw E5 and tilt the work-table it about its pivot 25. This tilting of the work-table will cause the ridge-former 30 to rise and fall relative to the presser-plate M, resulting inthe formation of skip-stitches and anchor-stitches.

When it is desired to produce successive anchorstitches, a manual withdrawal of the throw-out rod 87- will, through the rack 86 and gear 85, effect a clockwise turning of the inner plunger 75, causing the collar 82 to turn relative to the outer sleeve member 18 of the skip-stitch plunger. It will be appreciated that the detent means (projection 34 and cooperating detent notch 52) re leases under the pressure created by the withdrawing of the throw-out rod 81. When the collar 82 turns relative to the outer sleeve mem ber 18 the inclined cam face 83 contacted by the end of the projection 84 permits the inner and outer members of the skip-stitch plunger to move, under the action of the compression spring 80, into their contracted or telescoped position, In this telescoped position, the skip-stitch plunger 58 undergoes its usual reciprocatory movements, but the overall length of the plunger is shortened to the extent that the end of the inner plunger 78 does not contact the abutmentstitch eccentric GI and, consequently, a slight turning of the spindle 47, occasioned by the manual turning of the thumb-disk 56, will turn the skip-stitch spindle 4! and simultaneously adjust the position of both the skip-stitch plunger 58 and the stop-rod 39 relatively to their respective screws 55 and M. Thus, the selected initial difierential in elevation of thework-table between its anchor stitch position and its skip-stitch position is not affected during the turning of the thumb-disk 55, but rather the work-table i 6 is tilted through thesame are at a different'elevation relative to the stitching mechanism. It will be observed in Fig. 2 for instance, that when the thumb-disk 56 9 tracted positions, and means providing for at will relatively shifting said plung r sections from their extended position in which said plunger periodically engages said work-table to their contracted position in whichsaid plunger does not engage said worl -table, said last named means including a spring actingbetween said plunger sections for biasing them in one direction relatively to each other, and a cam in operative engagement with each of said plunger sections and operable to relatively move said plunger sections in the other direction. v

8. In a blind-stitch sewing machine, main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a worl -table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated wcrk-pre-- senting position of said work-table relative to said stitch-forming mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, work-- table moving means operated by said actuating shaft and providing for periodically moving said work-table away from said stop in opposition to said spring, said work-table moving means including a reciprocatory plunger movable into and out of engagement with said work-table and comprising telescopically arranged inner and outer sections having relatively axially extended and contracted positions, and means providing for relatively shifting said plunger sections axially of each othen said last named means including a collar mounted on one of said plunger sections and having a cam-shaped end-face disposed for engagement by theother of said plunger sections, a manually retracted throw-out member operatively connected to said collar to efiect a turning of the collar when said throw-out member is moved, and a spring acting between said inner and outer sections to maintain said plunger section in contact with the cam-shaft end-iace of said collar.

9. In a blind-stitch sewing machine, a main frame having a base, a standard and an overhanging arm, and stitch-forming mechanism in said overhanging arm, of a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a stop for determining the elevated work-presenting position of said work-table relative to said stitch-forming mechanism, a spring for biasing said work-table toward said stop, an actuating shaft journaled in said main frame, work-table moving means operated by said actuating shaft and providing for periodically moving said worktable away from said stop in opposition to said spring, said Work-table moving means including a reciprocatory plunger movable into and out of engagement with said work-table and comprising telescopically arranged inner and outer sections having a relatively axially extended operative position and a contracted inoperative position, and means providing for relatively shifting said plunger sections axially of each other from one to the other end of said positions, said last named means including a peripherally toothed collar mounted on said inner plunger section and having a cam-shaped end-face disposed for engagement by the proximate end of said outer plunger section, a manually retracted throw-out rod provided with a rack in mesh with the peripheral teeth of said collar to effect a turning of the collar when said throw-out rod is 10 moved, a spring acting between said inner and outer sections to maintain said outer plunger section in contact with the cam-shaped end-face of said collar, and detent means for holding said inner and outer plunger sections in their extended operative position.

10. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a movable stop mounted in said base and disposed to be engaged by said work-table to locate the latter in its elevated work-presenting position, a spring for biasing said work-table into contact with said stop, an eccentric located in said main frame and supported for turning adjustment, a pitman connected at one end to said movable stop and at its other end to said eccentric, and means for adjusting said eccentric including a, thumb-disk mounted on said main frame.

11. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a movable stop member mounted in said base and disposed to be engaged by said work-table to locate the latter in its elevated work-presenting position, a spring for biasing said work-table into contact with said stop, an eccentric mounted within the lower portion of said standard and supported for turning adjustment, means operatively connecting said stop member to said eccentric, and means for turning said eccentric including a manually operable element located adjacent the top of said standard.

12. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a movable stop member mounted in said base and disposed to be engaged by said work-table to locate the latter in its elevated work-presenting position, a spring for biasing said work-table into contact with said stop, a pivot-spindle mounted for turning movement in said standard, an eccentric mounted on said spindle, means operatively connecting said stop member to said eccentric, and manually operable means located on said standard and operatively associated with said pivot-spindle for turning the same and thereby adjusting the position of said stop-member.

13. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, a movable stop member mounted in said base and disposed to be engaged by said work-table to locate the latter in its elevated work-presenting position, a spring for biasing said work-table into contact with said stop, a pivot-spindle mounted for turning movement in said standard and hav ing an eccentric provided thereon, means operatively connecting said stop-member to said eccentric, a rock-arm secured to said pivot-spindle, and a manually operable member located on said standard and operatively connected to said rock- 11 arm to provide for turning the pivot-spindle and thereby adjusting the position of said stopmember.

14. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a rotary shaft journaled in said main frame, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, and means for moving said work-table relative to said overhanging arm, said means including a movable abutment member disposed to engage said worktable, .an eccentric mounted for rotation within said main frame, driving mechanism operatively connecting said abutment member to said eccentric, and means for rotating said eccentric including a driving belt connection with said rotary shaft.

15. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a rotary shaft journaled in said main frame, a work-table movably mounted on said base and having a portion underlying the free end of said overhanging arm, and means for moving said work-table relative to said overhanging arm, said means including a movable abutment member disposed to engage said Work-table, a pivot-spindle journaled for turning movement in said main frame and having an eccentrically disposed portion provided thereon, a driven eccentric journaled for rotation on the eccentrically disposed portion of said pivot-spindle, means operatively connecting said abutment member to said eccentric, a driving belt connecting said eccentric to said rotary shaft, and manually actuated connections associated 12 with said Divot-spindle for turning the latter and thereby adjusting the position of action of said abutment member.

16. A blind-stitch sewing machine having a main frame including a base, a standard and an overhanging arm, stitch-forming mechanism in said overhanging arm, a rotary shaft journaled in said main frame, a work-table movably mounted on said base and having a, portion underlying the free end of said overhanging arm, a movable stop member mounted in said base, means for yieldingly maintaining said work table in contact with said stop-member, a movable abutment member periodically operated to engage said work-table and move it away from said stop member in opposition to said yieldable means, a pivot-spindle journaled for turning movement in said main frame and having an eccentrically disposed portion provided thereon, a pitman connected at one end to said stopmember and at its other end formed to embrace said eccentrically disposed portion on said pivotspindle, a driven eccentric journaled for rotation on said eccentrically disposed portion on said pivot-spindle, means operatively connecting said abutment member to said eccentric, driving means connecting said eccentric to said rotary shaft, and manually actuated connections associated with said pivot-spindle for turning the latter and thereby simultaneously adjusting said stop member and the position of action of said abutment member.

Name Date Buono et a1 Sept. 12, 1933 Number

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