US2768594A - Presser foot for button sewing machine - Google Patents

Description

Oct. 30, 1956 w. A. TROLL PRESSER FOOT FOR BUTTON SEWING MACHINE 5 Sheets-Sheet l Filed July 1s, 1951 INVENTOR mzzmmAZ-Ou Y' @MM/M, ATTORNEY PRESSER FOOT FOR BUTTON SEWING MACHINE Filed July 16, 1951 5 Sheets-Sheet 2 lNvENToR www Oct. 30, 1956 w. A. T'RoLl. 2,758,594

PRESSER FOOT FOR BUTTON SEWING MACHINE Filed July 1e, 1951 5 sheets-shea 3 INVENTOR United States Patent i gud PRESSER FOOT FOR BUTTON SEWING MACHINE William A. Troll, Brooklyn, N. Y., assigner to Emsig hglanufacturing Company, New York, N. Y., a partner- S P Application July 16, 195'1, Serial No. 236,997

4 Claims. (Cl. 112-113) This invention relates to button sewing attachments, and more particularly to a presser foot for a button feeding machine.

This invention embodies improvements over my invention disclosed in my application Serial No. 166,754, filed June 7, -1950, now Patent No. 2,661,709, granted Decem- 'ber 8, 1953.

My invention in my application aforesaid concerns itself `with a -presser foot construction Vfor a button sewing machine wherein'the presser foot has combined therewith -afchute leading to a hopper for providing a continuous supply of buttons to the Ypresser foot. In thepractice of `the v"invention the feeding chute aligns sewing hole buttons adjacent a Zone wherein an orienting claw and feed- Virig'clfaw ltransposelor shift the button to the sewing position from -the zone in the chute by entering the sewing -holeof the button. The action of mechanically entering fthe -hole to orient, transpose and sew through Vthe sewing hole, when effected under unusually high speeds, frequentl'y results in an impelling action 'and reflection which, lwitl'ii-n the tolerances which are found necessary, 'may disalign a button fromethe predetermined adjusted position for accurately orienting, transposing and `sewing,'to cause -needle breakage-'and consequent interruption.

Accordingly, it--is an object of my invention to provide `a presser foot for buttons in which the presser foot and `chute are coordinated `totranspose a button from a series in a ffeed line or -stack in a chute 'to the sewing position, and to guide the button as it is transmitted from a pro- "iniscuous arrangement of the sewing hole to an oriented position ofthe sewing hole, so that accurate, high speed feeding means may be retained.

Still more particularly i't Ais an 'object of my invention to Aprovide high speed feeding means in an automatic "button feeding 'and presser foot attachment characterized by the 'fact that the momentum of rapidly moving parts 'does'n'o't adversely afec't'the accuracy of orienting, transposing and holding Athe button during the button .sewing operations.

To attain these objects and such Vfurther objects as f'may appear herein or be 'hereinafter pointed out, I make 1''e"feien'ce tothe accompanying drawings, forming a part hereof, in which- .Figurel is arfragrnentary `'front elevation of a presser vfoot -and button `feeding ,attachment `in accordance with .my invention;

A Figure 2 is a staggered side elevation on the line 2 2 of Figure l;

`Figure 3 is a 'magnified section taken along the line `Figure 4 Vis a section taken along the line 4-4 of rFigure 3;

Figures 5 and 6 4are views similar to Figure 4, with 1theparts of the -orienting :and transporting .mechanism fin `different gpositions;

'Figure'7 'is a section taken'on `the line 7-7 of Figure-,4;

Figure 8 is optimum position;

Figures 9 and 10 are similar views with the button displaced in slightly abnormal positions.

My invention may be summarized as providing in a combination presser foot and button feeding device, a button orienting, transporting and clamping mechanism which is connected to a button feeding chute in which the shifting of the button from the chute to thepresser foot where sewing is effected is accomplished at high speeds, and the cycle of operation involving the step of withdrawing a single button from a line of feed, orienting the button with regard to the sewing holes and transporting the same to the sewing position, and the return of the parts to the initial position are effected with great rapidity, while so holding the button during the various operations enumerated to secure accuracy and independence of the iniluence of the rapidly moving parts.

Making reference to the drawings, there is shown a fragment of a button sewing machine displaying the head 10, the needle bar 11 for the needle 12 and the lifting bar 13. The lifting bar 13 is arranged to be operated by the usual clamp operating rock lever, to which is attached a bracket arm 14, engaging the lever 15 by being directed through the eye or fork 16. The lever 15 is pivotally supported on the block 17 to rock on the pivot 15. The free end 19 of the lever 1S is provided with a fork 20, engaging the finger 21, which is connected with the carriage 22. The carriage 22 which is provided with flanged friction relieving rollers 22a rides on the chute 23, leading to a button hopper (not shown) in accordance with my application aforementioned.

The chute has a channel 24 Vfor receiving the buttons B and within which the buttons may slide in edge-to-edge contact, running from the relatively vertical segment 25 to the presser foot branch 26. Cover plates 27 and 28 :cover the channel to outline a slot through which the buttons within the channel are accessible. The guide slot 29 is in a non-central position with regard to the channel 24, to provide the guiding edge walls 30 and 31 spaced with relation to the buttons B, to cover the locus of .points of the thread receiving apertures a and b .for one-quarter of the button and merging into the quarter turn arcuate guide walls 32 and 33 leading to the edges 34 and 35, defining respectively an arcuate slot 36 leading to a centrally positioned slot 37.

It will be understood by reference to my prior appli- `cation that the guide slot 2,9 joining with `the sections 36 and 37 is accessible to the shank of the pin l38, to drag a button B between the walls 39 and 40 and t-he cover plates 27 and v28, to orient the button sothat the sewing hole or thread receiving apertures a and b are aligned centrally with the guide slot 37. This orienting action by a procedural step of dragging the button in the channel 24 by scanning the locus of points of the button apertures lvz and b is eifected automatically by the mechanism illustrated herein Iand mounted upon the carriage 22, as in my prior application. The illustration which is made is for a two-hole sewing hole button, more particularly Va button in accordance with the patent to Bmsig, 2,451,077, of October 12, 1948, and it will be understood that :the four-hole or three-hole sewing hole button may be employed.

lIn the aforesaid construct-ion the carriage 22 lhas a cross pin 41, on which is mounted the lever 42, having `a rocking bearing 43, permitting rocking action during pivotal movement, as controlled by the set screw 43a. The lever 42 has yan extension linger 44, by which it may be springbiased by the coil spring 45 to the anchoring pin 46, .passing through the feeding lever 47. The feeding llever 47 is formed with slots 48, 49, and 50, in parallelism, the cross pin 41 f-passing through the slot 49 and pins 46 and 51 passing through the slots 48 and '50,.re-

spectively. The anchoring pins 46 and 51 are supported on tripping lever 52.

The feeding lever `47 has a linger 53 transversely extending to support one end ofthe spring 54. The other end of the spring l54 is anchored to the pin 46. The tripping Ilever 52 is spring biased for counter-clockwise rotary movement when viewed in the direction of Figure l yby the spring 55, whose end 56 is turned to engage the lever S2 in opposi-tion to the anchoring end 57 engaging the carriage flange 58.

The carriage 22 is normally biased against the stop 59 by the spring 60, extended at its opposite ends from Ithe pin 61 and the end 62 of the cross pin 41.

The biasing action of the springs normally maintains the levers in a position shown to project the terminal angularly bent end 63 and the bent end 64 of the feed levers 42 and 47, respectively, into Contact with the cover plate 27 so that in the normal position, i. e., that of pressing down on the work for sewing, the feeler pin 33 is extended in the slot 29. The lever 42 has a cross finger 65 which rides over the lever 52 so that movement `of the end 66 will be in the path engaging the finger 65.

Referring now to Figures 1 and 2, it will be observed that the presser foot just described may press down on the bed plate 1 by means of the clamp arm 7 to which the post 9 is attached, hooked to L-bar 9 on the lifting bar 13 previously described to tilt the lever 15 as well as to lift the post 9. The clamp arm 7 has attached thereto a bracket 8 having a branch Sa atiixed to the rear of the chute 23. The contour of the bracket 8 is determined by the direction of jogging of the clamp Y assembly 7 by the sewing machine, which may jog the presser foot and button with relation to the needle stroke in accordance wtih the number of sewing hole apertures and the direction of shift of the work to alternate the thrust of the needle from one sewing thread aperture to another in a manner which will be readily understood.

Upon actuation of the lifting bar through manipulation of the treadle or other arrangements for motion transmission, as described in my prior application, now Patent No. 2,661,709, the lifting bar 13 also transmits movement through the bracket arm 14 to engage the lever 15 and relatively tilt the free end 19 to engage the finger 21 which is connected with the carriage 22. The initial action is to raise the pin 38 from the slot segments 36, 37, which are a continuation of the channel 29. This permits a button B to slide down into the channel 2.4 beneath the extension 66a of the cover plate strip 28 until it abuts the finger 67 on the arm 63 which, by the pin 69, supports the pressure arm 70, independently movable of the finger 67 on the arm 68 and carrying a ange 71 with an edge 72 aligned with the edge 35 in opposed relation to the edge 34 of the cover plate 27. The pin 69 pivotally carries the arms 68 and 70 on the upstanding branch of the stop bracket 73. An extension finger 74, having a slit 75, is engaged by the spring lever 76 mounted on the pin 77 normally to bias the finger 67 in the path of the button within the channel 24. The opposite arm 73 is biased against the transverse flange 79 of the bracket.

Also sleeved on the pin 77 is a spiral spring 80 whose transverse end 81 is biased against the end of the arm 70. The anchoring arm 32 is biased in `opposition against the tiange 79 of the bracket previously described.

The preliminary movement thus far described serves to bring a button in position for orientation.

In the lifting of the presser foot and chute by the initial movement described, the lever 52 has been directed progressively to move the latching iiange 83 against the guide 84. The guide 84 consists of an upstanding iat spring arm 35, yieldable transversely and having a fiange 86 which is rigidly attached to the chute by the screw 87. The latching iiange 83 has a lower camming face 88, for deflecting the latching guide 34 as the limit of movement of the carriage toward the end of the presser foot has been reached and snapping the upper face of the latching flange 3 beneath the guide 4. As the presser foot is again released, by releasing the lifting bar 13, the carriage is given movement aided by the spring 60 which tilts the lever 52, to retract the lever ends 63 and 64 from the channel (see Figure 6).

As the lever 52 tilts upwardly, it engages the tinger 65 and at the same time the pin 46, to carry the lever end 64 from the channel. At the limit of the stroke downwardly of the presser foot, as shown in Figures l and 2, the latching ange 83 has become disengaged from the guide 84, to propel the lever end 63 toward the cover plate and resiliently urge the pin 33 on the upper surface of the button B, which has now slid to the limiting position previously described.

Again raising the presser foot through the medium of the draw bar 13 will cause the pin 38 to scan the face of the button in the X position shown in Figures 4 to 7, which is the third position from the end of the presser foot. As the pin 38 follows the channel between the edges 30-31 to the point 36, it scans the locus of points of every sewing hole a, drops into this aperture and, on continued movement, drags the button eccentrically, to orient the apertures a and b aligned with the channel 37, defined by the edges 34 and 35. Continued movement of the presser foot upwardly will serve to pry the extension 66a upwardly, and move the button against and passed the finger 67 until the button is shifted to the Y position shown in Figure 5. The finger 67 then drops behind the trailing edge c of the button in the Y position.

The button in the Y position, by the same movement but independently of the finger 67, has been pried beneath the iiange 71 carried by the lever 70, the beveled peripheral edge of the button camming the ange 71 out of its path.

The upward, relative movement of the presser foot to the limiting position is secured when the pin 89 strikes the stop 90. Continued movement of the carriage relatively to the lever 47 is permitted within the slots 48, 49 and 50 previously described, to secure a jolting action against the stop 90 on the upstanding stop bracket 73. Again lowering the presser foot repeats the movement of the levers 42, 47 and 52, returning the lever 47 to the position shown in Figure 4 and causing the claw pins 91 and 92 to enter the sewing hole apertures a and b which have been aligned to be coincident with the channel defined by the edges 34 and 72 and which is an axial continuation of the channel 37.

Repeating the raising of the presser foot at this stage projects the lever 47, with its end 64, to the position shown in Figure 5, guiding the button bodily in the sewing position Z, where the end 93 of the cover plate 27 is formed with a clearance cutout 94 over the flange 95 of the presser foot and surrounding the annular clearance cutout 96.

Opposed to the ange 95 is a flange 97, both of which are extensions of the branch 26. The wall 40 above the flange 97 is cut away to form a guide face 98 and shoulder 99 forming a slot 100 beneath the cover plate segment 101. Sandwiched between the tiange 97 and the cover plate 101 I provide an arm 102 which is pivoted on the block 103. A spring 104 is anchored by the screw 105 to bias the ends 106 and 107 away from each other and to have the spring finger 108 press the upstanding branch 109 of the lever normally outwardly at that end and to project the jaw 110 inwardly into the slot 100 between the flange 97 and the cover plate end 101. The jaw 110 is formed with a seat 111. The axial line through the seat 111 is positioned to intersect the center of a button which may be moved to the sewing position Z previously described. The seat 111 is yieldable with respect to a fixed point 112 which is an extension of the wall 39 beneath the cutout 94 provided by the cover plate end 93 and the underlying ange 95.

The seat 111 may be arcuate or may comprise angularly directed walls calculated to act in the nature of a detent seating the button in the Z position edgewise, with its center coincident with the calculated center of the sewing position of the machine. Yieldability of the seat 111 in one direction only is preferred.

With the construction described, upon repeating the raising of the presser foot assembly to guide the button bodil)l to the sewing position Z as above described, accuracy of location of the button is assured, despite any underor over-movement or displacement of the button which may occur by reason of the action of the claw pins 91 and 92. in the retraction of the lever 47 upon release of the presser foot after the button has been shifted to the Z position. Thus, the impelling or snap or spring action of the lever 47, as it withdraws the claw pins 91 and 92 from the sewing hole apertures, is neutralized, as is also any other influence or vibration where button irregularity may occur. Likewise, a larger tolerance in size between the pins 38, 91, 92 and the button sewing apertures may exist, without danger of needle breakage in sewing, as will be clear from Figs. 8-10, wherein the dotted lines a and a", b and b show the possible displacement of the sewing hole apertures a and b, which may occur Without needle breakage.

Chamfering of the sewing hole aperture adjacent the faces of the button increases the tolerable angle of displacement from the accurate position. As the sewing operation proceeds, the yieldability in one direction from the wall 112 assures a self-corrective influence on the button in sewing,

In operation of the construction which has been described, I have observed that high speed action, such as that obtained by transmitting an impelling movement to the draw bar 13, may be employed to effect the proper feed and discharge of the button at the end of each cycle of sewing. The combination of making :provision for a positive stop for the button by the finger 67 independently of the friction provided by the pressure plate 71 and independently of the gripping pressure of the jaw 110 extended to the button, serve to exert a corrective influence on the misalignment in the proper positioning of the button which may occur due to the disturbance caused by the rapidity of movement of the associated parts. Likewise, by the construction described a corrective influence is effected due to any wear caused by constant rubbing of the buttons on the plate portions of the guide. Still further rebounding of the rspring parts in orienting and positioning of the button by the claw shifting mechanism is neutralized and the effect of any incorrect positioning which would ordiuariiy occur is overcome and corrected.

l't will also be observed that yieldability of the button held in the Z position in the direction of the jaw 110 and centering the button with respect to the seat 111 formed thereon assures proper sewing with a loop stitch type of button sewing machine without failure, and loose stitching disappears.

It will thus be observed that by the construction described all the benefits of the construction of the aforementioned application may be obtained at high speeds and without the damaging influence of spring rebound, vibration, wear or displacement, which may occur or be present in the employment of said assembly.

For further understanding of the direction of feed and the positioning of the bracket necessary for such feed to take care of buttons of the two, three or four hole variety, reference is made to my patent aforesaid. It will also be understood that where the feed is modified to handle a four-hole button, even though orientation is effected by engagement of two sewing holes positioned diagonally with respect to each other, the jogging of the work holder undergoes the usual cycle of sewing two adjacent sewing holes.

Similar changes are required for feeding a three hole button, in which case the feed is along a line coinciding with all three holes of the button diametrically through the button.

Each button feeding attachment is constructed dimensionally to handle a predetermined size of button as will be readily understood by the skilled worker.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:

1. In a button sewing machine attachment, a chute and combined presser foot extended therefrom for feeding sewing hole but-tons in edge-to-edge contact from a source of supply to a button clamp and presser foot, a button orienting member arranged to be coupled to the presser foot including a button hole prong eccentrically scanning and engaging a button hole to shift the hole to an axial position in the chute, a button transporting member having button hole engaging prongs to shift the button to a button sewing position, the combination having independent resilient means engaging the button in each of the positions of aforesaid whereby the button under the influence of one of the members does not alter the adjustment with respect to the button under the influence of the other member.

2. A sewing hole button feeder attachment for a button sewing machine comprising a presser foot having a chute adapted to be connected to a magazine source of supply of buttons serially to feed the buttons in edge to edge arrangement in said chute to said presser foot, said presser foot being slidably mounted on a bracket adapted to be connected to said button sewing machine, means for limiting the sliding movement of the buttons through the chute, tilting means comprising levers mounted on the bracket having sewing hole pins for orienting and transporting the buttons from said limiting means to the sewing position on the presser foot during relative movement of the presser foot in respect of the bracket, a button face engaging member positioned below said limiting means in the chute for resiliently pressing upon the button for holding it for manipulation by the pins.

3. A sewing hole button feeder attachment in accordance with claim 2 wherein said button limiting means comprises a spring biased finger axially offset in the chute in the path leading to said button face engaging member to limit reverse movement of the button upon engagement of said button by the pins for transporting the button.

4. In a sewing hole button feeder attachment having a presser foot and a magazine feed connected therewith arranged for operation by the movement of the presser foot in the releasing cycle of movement thereof, and including means to feed a button from a serially arranged supply to a button clamp on said presser foot, a fixed guide in said clamp, an opposed resilient detent jaw yieldable in relation -to said fixed guide, a substantially at guide face below said fixed guide and opposed detent jaw, between which guides and over which guide face the button may be yieldably displaced in seating and during sewmg.

References Cited in the file of this patent UNITED STATES PATENTS 1,903,268 Ross Mar. 28, 1933 1,903,269 Ross et al. Mar. 28, 1933 1,940,229 Rawnsley Dec. 19, 1933

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