US3086486A - Button feeder - Google Patents

Description

April 23, 1963 w. A. TROLL 3,086,486

BUTTON FEEDER Original Filed Dec. 27, 1956 3a 5 Sheets-Sheet 1 wa Ma llllllllii INVENTOR @ATTORNEY W. A. TROLL BUTTON FEEDER April 23, 1963 5 Sheets-Sheet 2 Original Filed Dec. 27, 1956 INVENTOR WM QM BY W. A. TROLL BUTTON FEEDER April 23, 1963 5 Sheets-Sheet 3 Original File d Dec. 27, 1956 INVENTQR MTTORNEY April 23, 1963 I w. A. TROLL 3,086,486

BUTTON FEEDER Original Filed Dec. 27, 1956 5 Sheets-Sheet 4 T12]. .35.

INVENTOR flTTORNEY W. A. TROLL BUTTON FEEDER April 23,1963

Original Filed Dec. 27, 1956 1a.

5 SEets-Sheet 5 'zgj/ ATTORNEY United States Patent 3,086,486 BUTTON FEEDER William A. Troll, Ridgewood, N.Y., assignor to Emsig lganufacturing Company, New York, N.Y., a partners 1p Original application Dec. 27, 1956, Ser. No. 630,778, new Patent No. 3,008,607, dated Nov. 1.4, 1961. Divided and this application Aug. 3, 1960, Ser. No. 47,238 3 Claims. (Cl. 112-113) This invention relates to button feeders, and more particularly to button orienting and feeding means for use in button sewing operations.

My invention more specifically relates to orienting means for buttons of the self-shank type, and still more particularly to the sewing and feeding of lenticular, shankless buttons more specifically described and set forth in the patent of Sidney Emsig, No. 2,939,171, issued June 7, 1960, entitled Button, and is a division of my application Serial No. 630,778, filed December 27, 1956, now Patent No. 3,008,607, issued Nov. 14, 1961.

My invention particularly has for its object making it commercially economically possible to effect sewing operations of shankless buttons, particularly shankless buttons of a generally lenticular configuration.

Among the objects of the invention is the provision of feeding means for buttons of the character described as applicable to automatic button sewing machines whereby with each automatically performed cycle of button sewing, the button will be brought into sewing position, oriented with the sewing hole thereof in respect of the path of the needle. In its more specific phases, the ob jects of the invention are to provide a feeder so that the cycle of raising the presser foot means to permit the location of the work in position for afiixing the button and releasing the presser foot to set into motion the mechanism to carry out the stitching operation, will be accompanied by a positioning of the next button and an ejection of the button sewn to thework, all accomplished without manual handling of the button and accomplished as rapidly as the cycles of sewing can be elfected.

While automatic feeding of buttons of the self-shank type and sew-through type has been successfully accomplished in my Patents Nos. 2,597,912 of May 27, 1952, and 2,661,709 of December 8, 1953, the adaptation of said feeders to self-shank buttons, particularly of lenticular outline, has encountered obstacles due to the relatively symmetrical contour of lenticular buttons.

Furthermore, while the retention of shank buttons in sewing position against the work has been demonstrated as feasible by one of my patents aforementioned, the very minute and limited extension of the substantially semispherical surface of a lenticularly shaped button has heretofore confined the use of this button to manual sewing operations, notwithstanding its highly desirable properties, structurally and ornamentally.

Accordingly, it is an object of my invention to provide a button classifying assembly whereby buttons of symmetrical outline, including shankless buttons or those approaching a lenticular outline, may be quickly and facilely fed in oriented position for use in attachment to work, either for manually handling the same or for automatically feeding the same to an automatic feeder as part of an automatic button afiixing or sewing machine.

Still more particularly, it is an object of this invention to provide a button classifier for orienting buttons of lenticular shape continuously, whereby they may be quickly and efliciently fed to a button ailixing device.

Still more particularly, it is an object of this invention to provide a button classifying device for orienting buttons, particularly of the self-shank contour or lenticular outline, from a bulk supply to an automatic button alfixing device whereby the button aflixing operation may be quickly and automatically conducted.

Still more particularly, it is an object of my invention to provide a feeder for lenticularly shaped buttons whereby such buttons may be quickly and effectively sewn to the work.

To attain these objects and such further objects as may appear herein or be hereinafter pointed out, I make reference to the accompanying drawings, forming a part hereof, in which- FIGURE 1 is a perspective view showing a feeder assembly in accordance with this invention;

FIGURE 2 is a magnified sectional view of a classifying hopper, with parts broken away;

FIGURE 3 is a section taken on the line 3-3 of FIG- URE 2;

FIGURE 3A is a perspective view of the standard for the hopper;

FIGURE 3B is a fragmentary section taken on the line 3B-3B of FIGURE 3A;

FIGURE 30 is a side elevation of a button to be used in the assembly;

FIGURE 4 is a fragmentary sectional view taken on the line 4-4 of FIGURE 2;

FIGURE 5 is a fragmentary sectional view on the line 5--5 of FIGURE 3;

FIGURE 6 is a magnified sectional view taken on the line 66 of FIGURE 5;

FIGURE 7 is a sectional view taken on the line 7-7 of FIGURE 6;

FIGURE 8 is a fragmentary view taken on the line 88 of FIGURE 3;

FIGURE 9 is a fragmentary section taken on the line 99 of FIGURE 8 FIGURE 10 is a magnified sectional view taken on the line 10-10 of FIGURE 9; and

FIGURE 11 is a magnified, fragmentary, perspective view of the lower portion of FIGURE 1.

My invention may be summarized in providing a classifier for self-shank buttons, particularly applicable to a bulk source of such buttons, as are of substantially lenticular outline and have front and rear faces which are substantially symmetrical to each other and include a thread aperture running along the front and rear faces, and a circular rim edge, which offer difficult problems in orienting not present in shank buttons. Thus, in accordance with the features of my invention, substantially symmetrical shapes may be oriented at high speeds for coupling to a button feeder of a button sewing machine, to assure a continuous flow of the buttons in consonance with the speed at which automatic button-sewing operations may be conducted.

Other features of the invention reside in the provision of a combined classifying hopper and button feeder for lenticular buttons of the character described, which will assure an abundant supply of oriented buttons without interruption, and minimizing any interruption in edge-to edge contact of a series of buttons in the chute leading to a button sewing machine.

Other features of my invention reside in the provision of a button feeder for buttons of lenticular or substantially spherical outline, heretofore presenting unusual dif ficulty in manually and automatically feeding to a button sewing machine. 7

Still more particularly, the invention resides in the provision of a button feeder for a lenticularly shaped button, to orient the thread receiving aperture quickly and automatically, notwithstanding the absence of projecting faces normally found in shank buttons or unsymmetrical sewthrough buttons, whereby this type of highly ornamental button may be practicably put to use at speeds of operation heretofore not attainable.

I now make reference to the drawings, wherein it is to be noted that the phases of my invention fall into the following categories:

Ia classifying hopper; II-a feeder chute; and III-a presser foot button sewer and ejector.

I. The Classifying Hopper It is to be noted at the outset that the classifying hopper now to be described concerns itself, in its specific form, with the classification of buttons of substantially lenticular outline, in which the front face and the rear face are substantially symmetrical, having a contour which may approach a spheroid, without any projecting shank locating the thread receiving hole to run between the opposed faces.

It is an object of this invention to utilize the features of construction of the button covered by the Emsig patent aforementioned, and particularly the knot cavity or groove thereof, to make possible a rapid, accurate and continuous flow of such buttons to keep pace with high speed automatic button sewing machines.

In the figures, a hopper is arranged to be supported on a standard 11 having a base 12, affixed to a table top on which the button sewing machine 13 is mounted. The standard 11 receives a sleeve 14 which, at its lower end 14a, rests on a collar 14b, adjustably connected to the standard 11.

The sleeve 14, at its upper end, is bifurcated to provide the spaced arms 14c, between which the vertical arm 14d is pivotally held by the pin 14a. An edge 14 is arranged to engage the bottom wall between the arms 140 to act as a stop rearwardly. A curved edge 14g permits forward tilting of the arm 14d within limits, as will appear herebelow.

The arm 14d has adjacent its upper end 15 provision for means for mounting the hopper housing 16. A hearing or like aperture 17 supports the shaft 18 which extends substantially horizontally. The housing 16 has a rearwardly extending boss 17a through which the shaft 18 extends and thereby supports the housing pivotally.

Side flanges 1611-4611, extending forwardly for a limited portion thereof but terminating adjacent the boss 17a, removably support the cover of the hopper and have a bottom wall 19 forming a circular raceway 20, into which the rear flange member 21 and the spider 22 fit. The rear flange member 21 and the spider 22 are keyed to the shaft 18 for rotation, to extend the peripheral edges 23 and 24 in close adjacency to the raceway 20.

At its upper portion, the housing 16 has an angularly directed edge wall 25 of semi-circular outline to which the shield 26 is removably aflixed, completing, with the bottom wall 19, a complete peripheral raceway extending over the peripheries 23 and 24 of the flange and spider, respectively.

The flange member 21 has extending from its rear face a pulley 27 for rotational driving by the belt 28, as will appear more clearly as this description proceeds.

The flange member 21 has its front face 29 formed with a smooth guide surface terminating axially in an axial race 30, spacing the spider 22 therefrom. The spider 22 consists of an axial boss 31 fitting over a boss 32 extending from the flange member 21, so that the flange member 2a. and spider 22 may rotate in unison in spaced relation to each other on the shaft 18. A front cover 33 has a bearing flange 34 sleeved on the outer end 35 of the shaft 18, to provide a chamber 36 to one side of the spider. An edge 37 of the cover 3-3 cooperates with an extension wall 38 of the housing 16, to provide a filling aperture to the chamber 36.

The cover member 33 has a guide wall 39 enclosing the front face adjacent the periphery of the spider 24 for a distance axially inwardly of the spider channels 40,

six in number, each defined by radial spokes 41, axially by the hub 42 and peripherally by the ledge 43 which flares angularly toward the raceway 20. The channels 40 form passages connecting the chamber 36 with the raceway 20, the latter being controlled as to depth with regard to the distance from the guide face 29 to the spider face 44, substantially to conform to the depth D of a button B (see FIGURE 3C).

The face 44 of the spider 24 adjacent the raceway 20 is blocked by button limiting means comprising pegs 45 arranged peripherally adjacent the ledges 43. The distance L between the button limiting pegs 45 is less than the diameter L of the button B. The ends 46 of the button limiting pegs extend into the raceway for a distance defining a passage P approximately equal to the thickness D of the button, and therefore for a distance less than the depth D at any other section of the button which is thickest to either side of the groove G.

The housing adjacent the raceway has an extension arm 47 formed with a longitudinal groove 48 defined by the edge wall 49 on the lower side and by the edge wall 50 on the upper side. The groove 48 corresponds substantially to the diameter L of the button, forming a throat T leading to the raceway. An extension plate 51 covers the groove 48 adjacent the throat T, to limit the throat T, for purposes which will appear as this description proceeds.

The cover 33 has edge flanges 52 and 53 substantially diametrically enveloping the raceway, limited adjacent the edge 49 of the edge walls of the throat T. An auxiliary throat 54 is angularly extended above the extension arm 47 and combines with a back plate 55 to form a discharge channel 56, leading to the raceway. A closure 57 is pivoted by the pin 58 at one end and enters into the slot 59, removably to block the auxiliary throat, for purposes which will appear as this description proceeds.

With the construction described, front and rear orientation of buttons of the character aforementioned is obtained by furnishing a bulk of buttons and depositing the same in the chamber 36. Agitation by rotation of the spider is then effected. For this purpose, a motor M is mounted on a bracket 60 supported and bolted to the arm 60a which has a bearing 6% through which the shaft 18 passes. The arm is adjustably held on the shaft by the set screw at the edge of the arm, to engage the shaft 18. The motor has a drive shaft 61 substantially in parallelism with the shaft 18. The drive shaft 61 is provided with a pulley 62 for driving the belt 28, Which extends over the pulley 27. The motor M may be rotated constantly, thereby continuously to drive the pulley 27 and the spider assembly coupled therewith.

The spider provides tumbling means to present the buttons under agitation through the channels 40, progressively reaching the raceway 20 previously described when the button limiting means in the form of the pegs 45 permits the buttons to pass radially outwardly under conditions exemplified in FIGURES 8, 9 and 10, and limited as to rear and face orientation when the button groove G straddles the ends 46 of the pegs 45. This is exemplified in the condition R shown in FIGURE 10, the condition of buttons at R, R and R exemplifying various possible positions of the button with respect to the limiting means or pegs 45. R particularly exemplifies a position which will preclude a button from ever reaching the raceway since the spacing L between pegs, as well as the length of the pegs, would prevent discharge from the channel to the raceway.

By the constant agitation of the spider, a quick orientation of the buttons is achieved, and the buttons are arranged in the raceway where, in an edgewise position of the buttons, they may roll continuously under the constant rotation of the spider and will not offer any material frictional resistance as the buttons are rolled to a position up to the throat T or away from the same. The

presence of a button in the throat T, accordingly, will cause no interference to continuous rotation.

Discharge of the buttons may then be effected through the throat T along the groove 48 or, optionally, through the auxiliary throat 54, by pivotally moving the closure 57 to unblock the auxiliary throat and thereby permitting the emptying of the hopper through the channel 56.

The construction described provides a front to rear oriented position of the buttons as they emerge from the throat T along the groove 48.

Should it be found desirable manually to remove a button from the groove 48, there is provided along the extension 47 a closure 63 which is removable by pivoting on the hinge 63, and which provides a ledge 64 substantially medially across the groove 48, thereby restraining lateral discharge of the buttons along the groove 48 except when the closure 63 is pivoted out of position. A latch 65, pivoted by the pin 66 on the chute segment 67, maintains the closure 63 in the groove covering position.

The assembly thus far described provides a first stage orientation of the buttons discharged through the throat T, at which point, as described, the closure 63 may be opened for manual removal of buttons. This initial orientation provides means for readily handling the buttons, if this alone is the desired position. The assembly, however, is primarily arranged for use in an automatic feeder which will now be described.

II. The Feeder Chute The extension arm 47 previously described is aligned with the chute segment 67 which is provided with a guide wall 68 in alignment with the edge wall 49 of the extension 47. The contiguous portions of the edges 49 and 68 are provided with a cutout 69 into which the peripheral edge 70 of the friction wheel 71 extends, to position the edge in alignment with the walls 49 and 68. The wheel 71 is driven by the shaft 61 of the motor M pre viously described. Buttons reaching the gap of the cutout 69 are thereby brought into peripheral contact with the friction wheel 71 by reason of the continuous rotation of this member.

"The upper edge of the chute groove 48 is provided with a pressure arm 72, pivoted beneath the extension '54 by the pivot pin 73. A pressure finger 74 contacts the upper edge of the button under the pressure of the spring 75, to maintain the button in contact with the friction wheel 71, thereby providing a guide slot 76 into whichthe pin 77 extends, yieldably to provide friction restraint and detent action on the button reaching the position beyond the point of tangency of the friction wheel 71 and the edge 49. The friction wheel rotates clockwise as viewed in FIGURE 2, imparting counter-clockwise rotation to the button in contact with the periphery 70 of the wheel.

The pressure finger 74, as it contacts the button, is channeled, as more clearly shown in FIGURE 6, to restrain the button against lateral displacement as it is rolled by the friction wheel 71 and moves along to encounter the leading edge-68' of the chute segment 67. At this portion, the guide wall 68 is overlapped by the cover plate 78 having an inwardly directed flange79 which includes a tapering gate 80 adjacent the edge 81. As the button is rotated by the friction wheel 71, the button first comes in contact with the cover plate 78 adjacent the edge 81, and then in contact with the gate '80, which is positioned to be aligned with the groove G of the button when it is rolling on the edge 68. Thereupon the button may gravitationally slide along the downwardly, angularly directed chute edge 68 and is maintained oriented by reason of the flange 79, holding the button against further rotary movement as it gravitates along the chute section, the end section 67 being provided along its length in opposition to the cover 78 with an angle plate 82, having a lengthwisely extended lip 83 edgewisely covering the edges of the row of buttons in the section 67 The chute section 67 is coupled to the chute section 84, constructed in all respects along its primary length com- 6 plemental to the chute section 67. Articulation is provided by a joint formed by the plate 85, which carries the pin 86 in coupling engagement with the ear 87. The chute section 84 terminates in a presser foot segment 88, the related details of which will now be described.

III. The Presser Foot Button Sewer and Ejector The presser foot segment 88 adjacent the chute section 67 has a guide wall 89 aligned at its upper edge with the guide wall 68 of the section 67. A cover plate 90 is formed with a flange 91 arranged to extend into the button groove G of the row of slidably mounted buttons in a manner similar to the flange 79 previously described, following however the contour of the elbow 92 which is arranged to extend substantially in parallelism to the work holding member 93. The chute segment 84 likewise includes a horizontally extending segment 94 and is affixed to the flange 95 of the work holding clamp 96 of the button sewing machine, the work holding clamp 96 having a block 97 adapted to be hooked to the lifting bar 98, whose upper end 99 is coupled to the lifting lever 100 in a manner well known in the button sewing machine of the type known as the Singer Button Sewing Machine #114.

The clamp arm 96 thereby is periodically and cyclically raised with each button sewing cycle, thereby to raise the horizontally extended presser foot segment 94, and with it to pivot the chute segment 84, further articulation being secured about the shaft 18 and the pin 14e, previously described.

The cover plate 90, at the presser foot segment 88, terminates in an angular branch 101 which merges into a pin 102. The branch 101 is resiliently urged against the segment 94 by the left spring 103 which pinches the buttons B and B frictionally to hold the buttons in the presser foot section adjacent the anvil 104.

The pin 102, being an extension of the flange 91, engages the groove G of the button and holds the button with the thread receiving apertures A vertically oriented in opposed position to the needle N. The row of buttons slidably gravitates in the channel of the chute segment 84, oriented under the guidance of a cover section 90, and is further held against tiltabl-e transverse displacement by the complemental cover section 90a. A lateral flange 9%, formed outwardly from the cover 90a, overlies the edges of the buttons from adjacent the end of the section 67 to and adjacent the edge 105 immediately above the elbow 88. Adjacent the terminal portlon 105 of the cover section 90a, there is positioned a pawl guide 106 comprising a rotatable flange wheel,'to one side of which extends the pawl 107, pivotallymounted on the pivoted lever 108 by the pin 108a, the lever 108 extending into contact with the lower edge of the sewing machine head, with which it is kept in contact.

The pawl 107 has a feeder finger 109 which may en gage the edge of the button. The pawl 107 is biased by the spring 110, to urge the camming face 111 into contact with the wheel 106, acting as a follower for the cam 111, as well as to bring the lever 108 into contact with the head of the machine.

The cam 111 may include a compound cam surface to provide, in relation to the follower and guide 106, a compound retracting and swinging movement terminating against the stop 112 as the limiting position, accurately to bring the button B into sewing position and to discharge the sewn button.

The sewing cycle of the machine described includes a work holding position wherein the button B held by the finger 102, presses against fabric overlying the anvil 104. With the installation as described, the button has been oriented so that its aperture A is aligned to receive the needle N during the back and forward jogging action of the needle where the work is stationary (or to be moved in relation to the needle, in the case of installations of button sewing machines where the work is jogged). In either case there is a release of the mechanism of the button sewing machine to lift the presser foot by means of the lift bar 98. This action drives the segments 84 upwardly to actuate the feeder pawl 107 so that the pawl finger 109 is swept to enter between the buttons B and B by engagement with the flange follower wheel 106, sliding the button B to the position previously occupied by the button B and ejecting the sewn button with the work.

The succeeding operation by the operator, by treadle means known in this type of button sewing machine installation, releases the presser foot into work holding engagement, with the button B properly aligned adjacent the anvil 104 and the needle N. Here, at this point, the sewing cycle is repeated, the stitching put into action being effected through the aperture A of the button, and successively about the pin 102, to enter the fabric which has been pinched by the pin 102 of the presser against the anvil 104. The repeated number of stitches with the required amount of loops as used in ,afl'ixing self-shank buttons are executed. The pin 102 being within the groove, the fabric to which the button is sewn determines under thread tension the length of the thread loop of the stitch and no extension of the loop is added because of the pin thickness. The penetration of the pawl finger 109 between adjacent buttons in the B and B position does not undesirably cant the buttons under the restraining influence of the flange 91 entering the groove G, so that jamming of the buttons rearwardly is thereby avoided.

From the foregoing it will be observed that the classifying hopper as provided by me assures an edge-to-edge arrangement of the buttons in face and rear oriented position, providing a supply which will keep pace with high speed withdrawal as the circumstances of the feeder may require. This is accomplished without the chance of blocking of the throat of the hopper or the need for employing slip belt motorized driving means, due to inactivity at intervals in the sewing cycle.

Furthermore, a relatively wide range of sizes of buttons may be handled by the same hopper, where the button thickness remains substantially constant, limited only by the distance of the channel limiting means 45 to the periphery and the spacing between these members to be less than the diameter of the button, further limitation as to a range of sizes being a factor of the yieldability of the arm 72 and the slot 76 to keep the buttons in contact with the wheel 71.

These advantages are further achieved by effecting the orientation in two stages, each employing a rolling action as the buttons are fed from the bulk source to the chute leading to the button presser foot assembly.

By the employment of chute means having a guide engaging the button indentation or groove, including the indentation engaging flange 79 which guides the buttons seriatim edgewise, a relatively wide range of button sizes may be employed with the same chute, where the buttons have a depth of substantially the same magnitude, requiring merely the maintenance of the flange 79 adjacent the midpoint of the button in relation to the gate 80 with respect to the point of tangency to the periphery 70 of the wheel 71.

By the employment of a presser foot including the indentation or rear slot engaging pin 102 as described, the buttons are maintained against tilting or canting within the chute, making possible the feed of the buttons to eject the same by engagement extended to within the chute channel. This operation avoids blocking or jamming, notwithstanding an extensive pressure head of a row of buttons as a continuous column.

By the provision of the pin 102 directed to extend within the body of the button, to hold the buttons in oriented position during sewing, a predetermined tension of the thread loop to the work may be secured, while retaining the button erect on the face of the work, thus effecting economies in labor by eliminating the manipulation of the button along the thread to present such relationship as is the case in some shank button sewing operations Where the thread is applied to extend the side of the shank and then it is required that the button be turned erect coaxially with the shank.

In general, high speed feeding of shankless buttons is thereby provided, to maintain the supply of buttons in pace with the button aflixing mechanism.

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

1. In a button feeder for a button sewing machine for shankless buttons of substantially lenticular outline having a thread aperture running rearwardly of the front face and including walls defining a clearance slot to one side thereof, a chute for guiding said buttons seriatim in edge to edge contact, including a channel outlining means and channel guide means spaced therefrom, having an inwardly directed flange along its length extending from the guide means, of a depth for engaging said walls defining said slot on the rear face of said button, said chute including a presser foot portion and said guide terminating in a pin extending in alignment with said flange arranged to be seated within said slot and about which pin the sewing thread loops may be effected in engaging the button to the work.

2. In a button feeder for a button sewing machine for shankless buttons of substantially lenticular outline having a thread aperture running rearwardly of the front face and including a clearance slot, a chute for guiding said buttons seriatim in edge to edge contact, said chute comprising a rear plate and a front guide between which said buttons are arranged to be spaced bodily, said guide including a button slot engaging flange along the length of said guide, for a depth in said chute holding said buttons oriented along the length of the chute, said chute having a presser foot portion at its terminal end, said flange on said guide terminating into a pin member in opposed position to said presser foot portion, arranged to enter said button slots and about which pin thread loops may be effected in attaching the button to the work.

3. In a button feeder for a button sewing machine for shankless buttons of substantially lenticular outline having a thread aperture running rearwardly of the front face and including a clearance slot, a chute for guiding said buttons seriatim in edge to edge contact, said chute comprising a rear plate and a front guide between which said buttons are arranged to be spaced bodily, said guide including a button slot engaging flange along the length of said guide, for a depth in said chute holding said buttons oriented along the length of the chute, said chute having a presser foot portion at its terminal end, said flange on said guide terminating into a pin member in opposed position to said presser foot portion, arranged to enter said button slot and pawl means arranged to be guided between said presser foot and pin, tiltably to eject a button from between said presser foot and pin.

References Cited in the file of this patent UNITED STATES PATENTS a 690,329 Thomson Dec. 31, 1901 1,063,885 Kiewicz June 3, 1913 1,940,229 Rawnsley Dec. 19, 1933 2,661,709 Troll Dec. 8, 1953 2,803,204 Alfandre Aug. 20, 1957 2,934,032 Troll Apr. 26, 1960

Claims (1)

1. IN A BUTTON FEEDER FOR A BUTTON SEWING MACHINE FOR SHANKLESS BUTTONS OF SUBSTANTIALLY LENTICULAR OUTLINE HAVING A THREAD APERTURE RUNNING REARWARDLY OF THE FRONT FACE AND INCLUDING WALLS DEFINING A CLEARANCE SLOT TO ONE SIDE THEREOF, A CHUTE FOR GUIDING SAID BUTTONS SERIATIM IN EDGE TO EDGE CONTACT, INCLUDING A CHANNEL OUTLINING MEANS AND CHANNEL GUIDE MEANS SPACED THEREFROM, HAVING AN INWARDLY DIRECTED FLANGE ALONG ITS LENGTH EXTENDING FROM THE GUIDE MEANS, OF A DEPTH FOR ENGAGING SAID WALLS DEFINING SAID SLOT ON THE REAR FACE OF SAID BUTTON, SAID CHUTE INCLUDING A PRESSER FOOT PORTION AND SAID GUIDE TERMINATING IN A PIN EXTENDING IN ALIGNMENT WITH SAID FLANGE ARRANGED TO BE SEATED WITHIN SAID SLOT AND ABOUT WHICH PIN THE SEWING THREAD LOOPS MAY BE EFFECTED IN ENGAGING THE BUTTON TO THE WORK.

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