US1819308A

US1819308A - Button edging machine

Info

Publication number: US1819308A
Application number: US384104A
Authority: US
Inventors: Fred I Walker
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-07
Filing date: 1929-08-07
Publication date: 1931-08-18
Anticipated expiration: 1948-08-18

Description

Aug. 18, 1931. F. l. WALKER 1,819,308

BUTTON EDGING MACHINE F iled Aug. 7, 1929 2 Sheets-Sheet J.

flux \9. INVENTOR W ATTORNEYS.

Aug. 18, 1931. F. WALKER BUTTON EDGING MACHINE Filed Aug. 7. 1929 2 Sheets-Sheet 2 fiv -0L MM, INVENTORI ATTORNEYZS.

Patented Aug. 18, 1931 FRED I. WAIiKER, OF NEWARK, JERSEY BUTTON EDGING MACHINE Application filed August 7, 1929. Serial No. 384,104.

This invention relates particularly to a machine for smoothing or grinding the edges of molded buttons to remove the burr formed at the joint of the mold sections, although the invention is equally well adaptable for grinding or smoothing the edges of other disc-like articles.

One object of the invention is to provide a machine of this character embodying a 10 novel and improved combination of abrading or grinding wheels and a work support so that button blanks or the like can be brought automatically into proper relation to the grinding wheels, rotated upon the work sup- 5 port by contact with said wheels which at the same time smooth the edges of the blanks, and discharged from the work support, whereby the edging of the buttons can be easily, rapidly and economically done without any special skill or attention being required of the operator.

Another object is to provide a machine of the character described wherein the button blanks can be deposited by machine or manually in recesses upon the work support without fastening or holding devices and so as to be freely rotatable in said recesses, and the work support moves said blanks to bring their edges into contact with the peripheries of opposed grinding wheels which are dis posed at angles to each other and said work support so as to rotate the button blanks between them in said recesses on the work support and at the same time smooth the edges of the blanks, the blanks being carried out of contact with said wheels by the work support and discharged therefrom by gravity.

Other objects are to provide such a machine in which the work support is in the form of a wheel having recesses on its periphery open at the sides of the wheel to loosely receive said blanks so that the edges of the blanks project beyond the wheel and the blanks are held against lateral displacement but are free to fall by gravit r from said recesses radially of the wheel said button being rotatable between the peripheries of grinding wheels which are so arranged that they contact with said edges of said blanks to hold the button 0 in said recess and are rotated in the same direction and at relative speeds so as to rotate the blanks in said recessesand smooth said edges to provide a button edging machine which is simple and inexpensive in construction and operation; and to provide other advantages and results as will be brought out by the following description.

Referring to the accompanying drawings in which corresponding and like parts are designated throughout the several views by the same reference characters, 7

Figure 1 is a side elevation of a button edging machine embodying my invention.

Figure 2 is a top plan view thereof.

Figure 3 is an end elevation viewing the machine from the line 3-3 of Figure 2, and with the emery wheel omitted for clearness of illustration.

Figure 4 is an enlarged fragmentary horizontal sectional view showing the manner in which the button blank is engaged by the emery wheels, and

Figure 5 is a front elevation of the parts illustrated in Figured.

Specifically describing the illustrated embodiment of the invention, the machine comprises a table or other suitable support 1 upon which is mounted a vertical bracket 2 in which is secured a horizontal shaft 3 upon which is rotatablymounted a work support 4 which may be in the form of a circular disc or wheel. The work support has in itsperiphery a plurality of circumferentially spaced recesses 5 to rotatably receive button blanks 6. Each recess preferably comprises a substantially flat bottom 7 and opens through the sides of the work support 4. The recesses are generally circular and of a diameter slightly greater than that of the button blank to be edged, the side walls 8 of the recesses being substantially straight and at right angles to the bottom 7. The button blanks 6 when they are discharged from the mold have a rough or burred edge which is formed by the crevice occurring atthe' meeting faces of the mold sections, and these button blanks are inserted in-the recesses 5 with their edges projecting'beyond the sides of the work support, as shown in Figures 2 and 4 of 'wheels 9 and 10 are substantially cylindrical and accordingly they overlie the button blank the drawings, so as to be exposed for the grinding operation.

Abrasive wheels 9 and 10, preferably of different diameters, are arranged one at each side of the work support 4, as shown in Figure 2 of the drawings so as to engage the pposite exposed portions of the edges of the button blanks. Preferably the abrasive wheels are so arranged as to engage each button blank when it reaches a position at 45 degrees to a vertical plane through the work support with the recess facing upwardly.

It is also preferable that one of the wheels,

in the present instance, the wheel 10, be so arranged that right angular axial planes thereof are disposed respectively at angles of 15 degrees and 135 degrees to the axis of the button, while the other wheel 9 is arranged with its axis in a common plane with the axis of the button and converging at an angle of approximately 15 degrees to the axis of the button. The peripheries of the abrasive as shown in Figures 1 and 5 so as to influence the button toward the bottom of the recess 5 and hold the button against displacement from the recess.

The abrasive wheels 9 and 10 are rotated at different speeds and in the same direction indicated by the arrows in Figures 2 and 5, the smaller wheel 9 being rotated at the higher speed. The wheels may be driven in any suitable manner, but as shown are mounted on the respective shafts 12 and 13 journaled in the

respective bearing blocks

14 and 15 which are secured to the table 1, the shafts having the respective belt and

ulley connections

16 and 17 with a suita le source of power.

With this construction it will be observed that when the button blank is moved by the work support into a position between the abrasive wheels 9 and 10, the exposed edge portions of the button blank will be engaged by the abrasive wheel and rotated in the direction of the arrows in Figure 5. There will also be relative rotation between the button blank and the abrasive wheels so that the burred edge of the button blank will be ground oif.

The work support 4 is rotated with a stepby-step motion so as to successively present the button. blanks to the abrasive wheels. For this purpose, I may utilize a pawl and ratchet mechanism comprising a pawl 18 pivotally mounted at 19 upon one end of a bell crank lever 20 which is pivoted at 21 on the table 1 and has its other arm influenced by a spring 22 so as to swing the lever in one direction; and the pawl 18 is arranged to engagethe side walls of the recesses 5 and is normally held in engagement with the periphery of the Work support by a tension spring 23 connected between the pawl and a lever 24 pivotally mounted at 25 on the table. The two

levers

20 and 24 are connected by a link 26 and so arranged tl at the link moves in a substantially horizontal plane. The end of the link 26 opposite the pawl 18 has journaled thereon a roller 27 which follows a cam 28 on a counter-shaft 29 which is driven by a worm and worm wheel gearing 30 from a shaft 31 driven by a belt and pulley connection 32 from a suitable source of power. With this construction it will be observed that the pawl 18 will be reciprocated by rotation of the cam 28 and will engage the side wall of one of the recesses 5 upon movement in one direction and slip over the periphery of the work supportupon movement in the opposite direction so as to rotate the work support in the direction of the arrow on F igure 1. The button blanks may be supplied to the recess 5 at the top of the work support either manually or automatically, and they will be brought by the work support successively into engagement with the abrasive wheels. After the button blanks have passed between the abrasive wheels they will fall by action of gravity from their respective reoesses as shown in Figure 1. To hold the button blanks against discharge from their recesses before they reach the desired point of discharge, I may hingedly mount a keeper plate 33 on the upper end of the bracket 2, said keeper plate being curved concentrically with the work support and bearing upon the top of the button blank which slides beneath the keeper.

To prevent overthrowing of the work support under the influence of the pawl and ratchet mechanism. I preferably provide a friction drag which may consist of a pair of friction blocks 34 mounted on the rods 35 slidably arranged in the bracket 1 and carried by a cross-head 36 which is slidable upon the projecting end of the shaft 3. A com pression spring 3'? is interposed between the cross-head and adjusting nuts 38 on the shaft so as to constantly exert yielding frictional pressure upon the side of the work support through the friction blocks 34. Also, preferably a friction washer 39 is interposed between a head 40 on the end of the shaft op-'- posite the nuts 38 so that the work support is forced against said friction washer by the spring 37. The frictional resistance to rotation of the work support is, of course, of such extent as to be easily overcome by the pawl and ratchet mechanism.

The

bearing blocks

14 and 15 may be adjustably mounted to vary the relation of the abrasive wheels to the button blanks, as may i be desirable.

While I have shown and described the invention embodied in the now preferred details of construction it will be understood that this is primarily for the purpose of illustrating the principles thereof and that many modifications and changes may be made in the details of construction without departing from the spirit or scope of the invention.

Having thus described my invention, what I claim is:

1. A button edging machine comprising a work support having an upwardly facing recess the plane of the bottom of which is at an angle of substantially forty-five degrees to the vertical to rotatably receive and hold a button against lateral displacement with diametrically opposite portions of its edges exposed, a pair of rotatable grinding wheels each with its periphery in contact with one of said opposite portions of the edge of the button, and means for rotating said wheels, said wheels being rotated at different speeds in the same direction and being angularly disposed with respect to said button so as to rotate the button and influence it toward the bottom of said recess.

2. A button edging machine comprising a work support having an upwardly facing straight walled recess for rotatably receiving and holding a button against lateral displacement with diametrically opposite portions of its edge exposed, a pair of rotatable grinding wheels each having a cylindrical coaxial periphery in contact with one of said exposed portions of the edge of the button, one of said wheels being arranged so that its axis and the axis of said button are substantially in a common plane and converge at an angle of approximately fifteen degrees, while right angular axial planes of the other wheel are respectively at angles of fifteen degrees and one hundred thirty five degrees to the axis of the button, and means for rotating said wheels in the same direction and the first mentioned Wheel at a higher speed than the other wheel, so that said button is rotated in said recess and held against axial movement therefrom by said wheels.

3. The machine set forth in claim 2 wherein said work support is a wheel rotatable upon a horizontal axis with a plurality of said recesses in its periphery with their axes radially disposed, and with the addition of means for rotating said work support with a step-by-step motion to move the buttons successively to and from said grinding wheels.

l. The machine set forth in claim 2, wherein said Work support is a wheel rotatable upon a horizontal axis with a plurality of said recesses in its periphery with their axes radially disposed and said grinding wheels are disposed so as to engage said buttons as each reaches a position with its axis at fortyfive degrees to the vertical, and with the addition of means for rotating said work support with a step-by-step motion to move the buttons successively to and from said grinding wheels.

5. A button edging machine comprising a work supporting wheel rotatably mounted upon a horizontal axis and having a plurality of circumferential spaced recesses with their axes radially disposed, each to rotatably receive and hold a button with its axis disposed radially to said wheel and with diametrically opposite portions of the edges of the button exposed, a pair of grinding wheels rotatable at diiferent speeds each with its periphery to contact with one of said opposite portions of the edge of the button in one of said recesses, said wheels being angularly disposed with respect to said button so as to rotate the button and grind the edge thereof, means for revolving both said grinding wheels, and means for rotating said work supporting wheel with a step-by-step motion to move the buttons successively to and from said grinding wheels.

FRED I. WALKER.