US917149A - Polishing-machine. - Google Patents

Description

J. REETZ.

POLISHING MACHINE.

APPLICATION FILED SEPT. 19, 1907,

Patented Apr. 6, 1909.

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J. REETZ.

PoLlsHING MACHINE. APPLIOATION FILED SEPT. 19, 1907.

Patented Apr. 6, 1909.

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Patented Apr. 6, 1909.

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JOHANN REETZ, OF DUSSELDORF, GERMANY.

POLISHING-TILACHIN E Application filed September 19, 1907.

T all whom it may concern:

Be it known that I, JOi-IANN REETZ, a citizen of Germany, residing at Dusseldorf, Germany, have invented new and useful improvements in Polishing-iitfachincs, of which the following is a specification.

This invention relates to a machine for polishing silver or other metal ware by means of a polishing tool provided with interchangeable parts, so that it may be used on articles of different configurations.

In the accompanying drawings: Figure 1 is a front view, partly in section, of my improved polishing machine; Fig. 2 a side vi" v, partly broken away, thereof; Fig. 3 a pl 1; Fig. 4 a detail of the work-holder and cooperating parts Fig. 5 a side view of a modification of the machine; Fig. 6 a detail of the worm-wheel and cooperating parts; 7 a similar view, showing the parts in different positions Fig. 8 a side view, partly in section, of a further modification, and Fig. 9 a detail of the polishing tool.

A resilient polishing tool 1 is adapted to be reciprocated horizontally over the surface of the work-piece while the latter receives simultaneously a gradual forward or osc llating motion according to its shape. Tool 1 assumes always a substantial perpendicular position to the work-piece and remains at a uniform distance therefrom, so that an even polish is imparted to the latter. As shown, two polishing tools 1 are employed, by means of which two spoons or other work-pieces may be polished simultaneously, one being polished at its front, while the other is polished at its back.

On thepowenshaft 5, which receives its movement from an electro-motor 17, are mounted a pair ofdisks 4 havingradial grooves 6 that receive crank-pins 3 adjustable within the grooves by setscrews 7.Pins 3 are connected byrods 11, with housings orsliders 8 carrying tools 1, and guided onrods 9 ofslides 10. By the means described, a longitudinal reciprocating movement is imparted to tools 1.Slides 10 carry the work-holders 14 and are provided withnuts 13 engaged byspindles 12, so that by turning the latter, the work-holders may be set to correspond to the movement of tools 1.

For polishing spoons and similar articles, the work-holders 14 are rotatably supported onslide 10, (Figs. 14). For thispurpose holders 14 are provided withshafts 16 slidable in the hubs oftoothed wheels 31 that Specification of Letters Patent.

Patented April 6, 1909.

Serial No. 393,614.

receive rotary motion in manner hereinafter described.hafts 16 are so secured toholders 14, that upon the rotation of the latter, the work-piece is so set that tools 1 extend vertically to the surface to be polished. Shaft 16 of each work-holder 14 receives motion from power-shaft 5 by atoothed wheel 18 fast on said shaft and engaging atoothed wheel 19, loosely mounted on acountershaft 24. Towheel 19 is secured abeveled gear wheel 20 which, bybeveled gear wheel 21, transmits movement to a beveled gear wheel 22 also loosely mounted onshaft 24.Wheels 20 and 22 are adapted to be coupled toshaft 24 by means of acoupling 23 slidably mounted on said shaft and adapted to engage respectively the serrated hub ofwheels 20 or 22. By coupling either of thewheels 20 and 22 toshaft 24, rotation in one or the other di rection will thus be imparted to the shaft. Uponshaft 24 is fixed a gear wheel 25 meshing into agear wheel 26 fast on awormshaft 27. The latter is engaged by awormwheel 28 which, throughgear wheels 29, 30 transmits motion towheel 31 and consequently to shaft 16 of work-holder 14.

During the rotation or transverse movement of,the work-piece, polishing tools 1 are longitudinally reciprocated, as hereinabove described. The stroke of tools 1 may be regulated by adjusting crank-pins 3 ingrooves 6 ofdisks 4. In order to cause tools 1 to uniformly act upon the work-piece,slides 10 are provided with pattern-holders 32 mounted onaxles 36. Pattern-holders 32 are provided withlevers 37 which, bylinks 38, are connected to levers 37 ofworkholders 14, so that pattern-holders 32 participate in the rotary movement ofworkholders 14.Holders 32 carry, at their lower side, pattern-plates 33, the surface of which corresponds accurately to that of the workpiece, so that tools 1 are held with a uniform pressure against the latter. Eachaxle 36 is journaled in abearing 39 slidably mounted inslide 10 and adjustable byscrew 40. By manipulating the latter, the pressure of the polishing tool upon the work-piece may be regulated.

ork-holders 14 are provided with prop erly shapedsupports 15 that form a bearing for the spoon and part of the handle. The spoon is held in position while being polished by means of aclamping lever 41 pivoted to the work-holder and engaged by an eccentric 42.Supports 15 and pattern-plates 33 are secured to their respective holders in such a way that they may be readily exchanged.

To arrest the work-holder after a spoon has been polished, worm-wheel 28 is provided withstops 43 adapted to engage a shipping-lever 44, which, by means offork 45, is connected tocoupling 23. Simultaneously with the arrest of the work-holders, polishing tools 1 are arrested by cutting oli the electric current for electro-motor 17. For thispurpose shaft 46, to whichlever 44 is secured, carries the relatively fixed contact-lever 47, connected to one pole of the source of electricity and adapted to engagecontacts 48 connected to the other pole of said source. li hen one of thestops 43 engages lever 44, the latter is swung into its central position to disengagecoupling 23 fromwheels 20 and 22. Simultaneously with the movement of shipping-lever 44, contact-lever 47 has become disengaged fromcontacts 48, so that the machine comes to a stand-still.

I prefer to so operate the machine that the spoons are first polished on their back, (Figs. 1 and 4), and that then the machine is automatically arrested as above described. The spoon thus partly polished is now transferred to the second work-holder 14 to receive its face polish, (Fig. 2), while another unpolished spoon is secured to the first workholder. The machine is now re-started by turning hand-lever 49 ofshaft 46. Aslever 44 rests against one of thestops 43 before hand-lever 49 is operated, the latter can only be turned in one direction, i. e., away from said stop. In thisway coupling 23 engages thatwheel 20 or 22, which had remained idle during the previous operation of the machine, so that a proper return motion of theholders 14, 32 is insured.

For polishing cups, (Fig. 5), a work-holder 14 is used which is provided with asupport 15 to which the cup is held bytongs 41 engaged by aconical nut 50. /Vorkholders 14 receive a rotary motion, while pattern-holders 32 remain stationary during the polishing operation. For disconnectingholder 32 fromholder 14,bolt 51 which was previously used for securinglower lever 37 toshaft 15, is withdrawn and inserted into corresponding holes of bearing 39 andaxle 36 to arrest the latter. To maintaincoupling 23 in engagement with that one of thewheels 20, 22 to which it has been coupled, for continuously rotating the work-piece, stops 43 are withdrawn from worm-wheel 28, so that they will not influence shipping-lever 44. For this purpose, steps 43 are carried by anaxially displaccableshaft 52 which may be held in its retracted position by a suitable latch. 53, (Fig. 7). Upon withdrawing this latch,spring 54 causes the reengagement ofstops 43 with worm-wheel 28 to i apart to the work-holder a rocking motion when desired.

For polishing Work-pieces with a plain surface, (Fig. 3), pattern-holders 32 are arrested, as above described, and the pattern-plate 33 is made to correspond to the surface desired. The work-piece is secured to a laterally slidable table provided with arack 56 engaged by atoothed Wheel 55 secured toshaft 16.

T ie polishing tool is preferably guid ed in a perforated spindle 2, (Fig. 9), and is depressed by aspring 56. Asecond spring 57 interposed between the head of spindle2 and a shoulder ofhousing 8, tends to hold the spindle in permanent engagement with pattern-plate I. claim:

1. .In a machine oi the character described, a pattern, a work holder opposite thereto, means for clamping a work-piece to the workholder, a resilient polishing tool intermediate pattern and work-piece, means for recipro eating the polishing tool, means for uniformly oscillating said pattern and Workhoider, a coupling operatively connected to said oscillating means, and means controlled by the last-named means for opening the coupling at each reversal of oscillation, substantially as specified.

2. In a machine of the character described, a pattern, a work-holder arranged opposite thereto, means for clamping a work-piece to the work-holder, a resilient polishing tool intermediate pattern and Work-piece, a power shalt, means actuated thereby for reciproeating the polishing tool, a Worm, a coupling operatively connecting theworin to the power shaft, a Worm wheel engaging said worm, means operated by the Worm wheel for uniformly oscillating said pattern and workholder, and means controlledby the Worm wheel for opening the coupling, substantially as specified.

Signeil by me at Berlin, Germany this 9th day of September 1907.

JOHANN REEIZ. Vl itnesses TVVOLDEMAR HAUPT, WILLIAM MAYNER.

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