US855644A

US855644A - Polishing-machine.

Info

Publication number: US855644A
Application number: US30700606A
Authority: US
Inventors: Ernst Krueger
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-03-20
Filing date: 1906-03-20
Publication date: 1907-06-04
Anticipated expiration: 1924-06-04

Description

' PATENTED JUNE 4, 190?.

E. KRfTGER. POLISHING MACHINE.

APPLIOATION FILED MAR. 20 1906.

2 SHEETS-SHEET 1.

No. 855,544. PATENTED JUNE 4, 1907.

E. KBfiGER. POLISHING MAGHINE.

APPLICATION FILED MAR. 20, 1906.

2 SHEETSSHEET 2.

1am @WW ERNST KRUGER, or BERLIN, GERMANY.

PousHme-MAoi-saie.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed March 20, 1906. Serial No. 307,006.

To all whom it may concern:

Be it known that I, ERNST KRI'JGER, a subject of the King of Prussia, and a resident of Gormannstrasse 89, Berlin, Germany, have invented a new and useful Improved Polishing-Machine, of which the following is the specification. i

This invention relates to and has for its object a machine for automatically polishing round objects, especially round metal pases, in uninterrupted succession, by means of several polishing disks or the like, which machine, in contradistinction to well-known polishing machines which likewise feed, polish'and throw off the piece of work automatically, has as its chief feature the arrangement that the piece of work is automatically pushed bythe feeder on a rotating mandrel which is mounted between two or more polishing disks revolving at high speed and which is expanded or spread out by an automatically operating gripping device like a lathe-chuck, so that said mandrel holds the piece of work fast while it is being polished and indeed until the gripping device is automatically. loosened again and the finished polished object is thrown off by a pushing device. Meanwhile the feeder has already again taken hold of a new piece of work and the cycle of operation is repeated. I

One embodiment of a machine according to the present invention is shown in the acconip anying drawings, in which Figure 1 is a side elevation of the machine, the upper portion of the feeding shaft being broken off. Fig. 2 is a plan, and Fig. 3 is a side view of the machine partly in section, the feeding shaft being broken off. Fig. 4 shows the feeding device in section.

r The following description of the cycle of operations ex lains at the sametime the construction of t e machine.

As shown in Fig. 1, the objects to be polished, cylindrical metal cases .d for example, are placed oneover another in the feeding-shaft c which is adjustably fastened to the holder 1) means-of screws a. The horie zontally bent part b (Fig. 3) of the holder 1) has .a trapeziform cross section (Fig. 4). The feeder f is guided on it in a straight line by means of a dovetail-shaped guide'e. A U-shaped spring g is fastened immediately under thefeeding-shaft c to the holder b, the ends of said spring being provided with wedge-shaped. noses i pointing inward on d. their axles at a speed of about 2500 revoluwhich. the lowest piece of work d generally rests. Now as soon as the feeder f which has the form of a U (Fig. 4) is moved back by means of a rod Z which is operated by he two-armed lever is (Fig. 2) moved by a cam t mounted on the shaft p out of the position shown in Fig. 2 into the position according to Fig. 3, the rear edges of the feeder f strike upon both the wedge-shaped noses i and thereby press the U-shaped spring g so much apart that the lowest piece of work (1 in .the feeder f can fall into the said feeder. The next piece of work is then caught by the noses i of the spring 9 and is held until its turn comes at the next operation' Now the feederf goes forward on its guide 1 with the piece of work (1 lying in it and pushes the iece of Work baid mandrel m consists of several parts which can beexpanded or spread apart in a similar manner to the parts of an expanding chuck. For this purpose a rod 0 pointed at its front end is arranged dis laceably in the hollow sh aft nof the mandre m, which rod is at a suitable moment pushed forward by a cam g arranged on the shaft 10 by means of a lever 1" and thereby ex ands the mandrel m so thatthe same holds ast the piece of work (Z pushed on to it. Now the lever is is turned back again by the cam 25 on the shaft 1) and consequently the rod 1 -moves the feeder f back again into the position according to Fig. 3.- At this-moment-the cams ac a; which are'likewise on theshafts p, 1), cause the bearings c of the polishing-disk shafts w to approach so nearto one another, until both the polishing disks y touch the piece of work As the polishing. disks revolve round tions per minute and for this purpose are driven by means of belting or the like as Fig. 1 indicates by dotted lines, and as the mandrel shaft 'n, revolves however only about 5 or 6 times round its axle in the same time, the polishing disks y revolve about 500 times during one revolution of the piece of work. But as there are two polishing disks d on to the mandrelm (Fig. 3).

and consequently each works on half the circumference of the piece of work, half a revolution of the piece of work suffices in order to brightly polish its periphery. In addition to this, the axles w may also be vmounted in a well-known manner, so that they. can be moved simultaneously to and fro in the direction of their axles by for example cams which can be likewise arranged von shaft p or F, in such a way that every polnt of the circumference of the piece of work d is touched'many times by the polish--' ing disk. Now, as soon as the piece of work (Z has finished revolving half a revolution, the cam g on the shaft 22 pulls the expanding rod back again by means of'the'lever r. Consequently the parts'of the mandrel m are cam Z.

no longer expanded. At the same time a cam 2 (Figs. 2 & 3) arranged on the shaft p releases a spring 13 by means of alever 12; the spring has previously been compressed by a mud or sleeve 14 which is displaceable on the shaft 92 of the mandrel and is connect ed with the lever 12, the cam 2 moving the lower arm of the lever12 to the left as in Fig. 3. But as soon as the expanding rod 9 has released the mandrel m, the roller of the lever 12 has reached the highest point of the 'Now on the latter being rotated further, the spring 13 suddenly drives the sleeve l4forward and this sleeve pushes the pieceof work (Z which is now loose on the mandrel off the same so that it falls into a receptacleplaced underneath to receive it. Hereupon the expanding-rod 0 is pulledback once more by its lever r, so that the mandrel m is fully contracted and the feederf is able to place a new piece of work on it., The cycle of o erations repeats itself.

Both tie shafts,' p, p suitably receive their drive from a transverse shaft 16 by Thisjis provided means of the worm-gear 15. with a speed-pulley 17 which again, on its part, may be driven from countershafting by rope or belt drive or the like. The cams 9c being in engagement with the cross bars 18,

so that said cross bars approach one another or're'treat from one another if the screwed spindle 19 is rotated: In this. way the cams x which drive the shafts w of the polishing disks positively to and fro, can be gradually placed back in correspondence with the wear of the polishing disks, that is, they can at an y time be brought closer together.

1 The mandrel shaft n suitahly receives its drive from one of the two shafts 2), p as these have approximately the same-speed of rotation. For this purpose, the bevelv wheel gear 20 (Figs. 1 & 2) may either be employed directly for driving the shaft n, or, where this is not feasible onaccount of want of space, may be so arranged'that it in the first place drives a chain-wheel, 2.1 Fig. 3) which then rotates the, shaft n by means of chain '22.' The shaftn may also be driven from a frame, means for iolding a plurality of articles to be polished, a revoluble expansible mandrel mounted on the frame, means for feedingthe articles on" to saidmandrel, means for expanding said mandrel into'operative engagement with the article fed thereon and for maintaining the mandrel in its expanded condition during the operation of polishing, and for releasing the same thereafter, means for polishing the article, and means for throwing the article off the mandrel after the release of said operative engagement.

2. An automatic polishing machine of the type described, comprising in combination a frame, means for holding a plurality of articles to be polished, arevoluble expansible mandrel mounted on the frame, means for feeding the articles on to said mandrel, means for expanding said mandrel into operative engagement with the'article" fed thereon and for maintainingthe mandrel in its expanded condition during the operation of polishing, and for releasing the same thereafter, a Pinrality of revoluble 'olishing disks arranged aroundsaid mandre ,means for moving said polishing disks upagainst the artlcle on the mandrel and for withdrawing the same there'- 4 from, and means for throwing the article off the'mandr'el after the release of said operative engagement. 7

3. An automatic polishing machine of the type described, comprising-in combination a frame, means for holding; a plurality of articles, to be polished, a mandrel mounted on the frame, means' for feeding the articles on to'said mandrel, means for operatively interconnecting the mandrel and the article fed thereon, a plurality of revoluble polishing disks arranged around said mandrel, shafts to carrying said disks one shaft on each side Of and parallel to the-mandrel, rectilineally guided slides 12' supporting said shaft, pins attached to said slides, camsm engaging said pins andadapted to reciprocate said slides, rectilineally guided cross-bars 18 revolubly supporting said cams, revoluble shafts gp, p having feathers in sliding engagement with said cams for rotating said cams, aspindle1'9 having right-handed and left-handed screws,

ICC

one screw revolubly engaging one cross-bar and the other screw the other cross-bar, and means for rotating the spindle 19 by handy for the purpose of adjusting said cams on said shaft p, p and so adjusting-said polish ing disks with regard tothe article on the mandrel, means for disengaging the operative connection between the mandrel and article, and means for throwing the article said operative connection.

" type described, comprising in combination a means for 4 releasing the. same.

' with the mandrel means for disengaging the v on to said in.

v or maintaining the mandrel in its expanded T condi tion during the operation for releasing the same thereafter, means for feeder into i off the mandrel after the disengagement of" frame, a substantially vertical'feeding-shaft.

v for holding a plurality of articles'to be polpohshing machine of the ished, a mandrel mounted on the frame, a feeder f having a slide 6, a guide 6 for said slide arranged between the base of s ing shaft and said mandrel, means for'recip'rocating said feeder to and fro on said guide, a U-shaped s ring 9 immediately under the feeding-sha t said spring having wedgeshaped noses n'ormallyadapted to support the lowermost article in said shaft, said sprin being arranged in the path of the'feeder f whereby on the return of the feeder into its and for releasin the'same thereafter, means position under said shaft said feeder engages for driving sai rod into said mandrel to the spring and-releases said article whereupon expand the same and for withdrawing said the latter drops into the feeder and is subsethe article, and I quently fed on to said mandrel, means for o eratively interconnecting the mandrel and e article fed thereon, means for polishing the article While operatively connected with the mandrel, means for disengaging the operative connection between the mandrel and article, and meansfor throwing the article off i the mandrel afterthe disengagement of the said-operative connection.

0 An automatic polishing machine of the type described, comprising in combination a frame, a substantially vertical feeding-shaft for holding a plurality of articles .to be ished,a revoluble expansible mandrel mounted on the frame, a feeder f having a slide 6, a guide 6 for said slide arranged between the base of said feeding-shaft and said mandrel, means for reciprocating said feeder to and fro on said guide, means'for releasing the lowermost article from the feeding-shaft on the return of the feeder into its position under said feeding-shaft whereby said article drops into the feeder and is fed on to said mandrel, means for expanding said mandrel into operative engagement with the article fed thereon and for maintaining the mandrel in its ex. panded condition during the operation of 01- ishing, and. for releasing the same therea ter, means for olishin the article, and means for I throwing it e arti'cfe off the mandrel after release of said operative engagement.

9. ,An automatic polishing machine of the type described, comprising in combination a frame, a substantially vertical feeding-shaft for holding a plurality of articles to be polished, a revoluble mandrel mounted on the frame, a feeder f having a slide 6, a guide I) for said slide arranged between the base of said feeding-shaft and said mandrel, means or reciprocating guide, means for releasing the lowermost article from the feeding shaft on the return of the feeder into its position under said feeding-- said article drops into the d on to said mandrel, means for o eratively interconnecting the mandrel and tiie article fed thereon, a plurality of revoluble polishing disks arranged around said mandrel, means for moving -said polishing 4. An automatic ame', means for holding a plurality of arti- I cles to be polished, arevoluble expansible I mandrel, a hollow revoluble shaft supporting said mandrel, means for feeding the articles mandrel, a rod in said hollow shaft for expanding said mandrel into operative engagement with the article fed thereon and tion during the operation of polishing,

. 5. An automatic polishingmach-ine of the type described,,compri'sing incombination a frame, means for holding a lurality of articles to be 'olished, a revo uble expansible' mandrel, a ollow revoluble shaft supporting said mandrel, means for feeding the articles on to said mandrel, means for expanding said mandrel into operative "engagement. with the artidle fed thereonand'for maintaining the mandrel in its expanded condiof polishing, and

polishing the article, and means for throwing the article off the mandrel after the release of said operative engagement, said means consisting of a sleeve on the mandrel shaft, a spring acting onsaid sleeve and tending to press it against the article to be polished and periodically moving said sleeve against the force exerted by the spring and polishing machine of the type described, comprising in combination a ame, a substantially vertical feeding-shaft for heiding'a plurality of articles to be polished, a mandrel mounted on the frame, a feeder f havin a slide e, a guide '6 for said slide arrangedietween the base of said feeding-shaft and said mandrel, means for reqip rocating said feeder to and fro 6. An automatic on said guide, means for releasing the lowermost articlev from the feeding-shaft on the return of the ts position under said feeding aid article drops into the feederand is fed on to said mandrel, means for o eratively interconnecting the mandrel and t e article fed thereon, means for polishing the article While operatively connected I shaft whereby s o erative connection between the mandrel and article, and means for throwing the article off themandrel after the disengagement of said operative connection.

7. An automatic polishing. machine of the I type described, comprising in combinationa pol- ITO

the

&

disks up against the article on the mandrel and for Withdrawing the same therefrom, means for disengaging the operative connection between themandrel and article, and

5 means for throwing the aiticie, off the mandl el after the disengagement of said operatwe connection.

In testimony whereof I name to this specification in thepresence of the two subscrlbing witnesses. u v

JRNST KRUGER.

\Vitnesses:

\VOLDEMAR HAUPT, HEX RY HASPER.

have. signed my