US517643A - Grinding-machine - Google Patents

Description

D. H.vv CHURCH. GRINDING MACHINE.

6 Sheets-Sheet 1.

(No Model.)

PatentedjApr. 3, 1894.

INVENTE'L:

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6 Sheets-Sheet 2.

` Patented Apr. 3, 1894.

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INVENIIIRI bww. e le .,l n

D. H. CHURCH. GNINDING MACHINE.

(No Model.)

WITNEEEN-:Ez: 42M

(No Moda.) '6 sheets-sheer. 3.

D. H. CHURCH. @BINDINGA MACHINE.

No. 517,643. Patented Apr.. 3, 1894.

(No Model.) Y 'a sheets-sheet 4.

D. H. CHURCH.v

GRINDING MACHINE;

N0. 517,643. v A Patented Apr. 3, 1894.

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wAsHn-mrm. nA cA (No l'lkodel.) D. H. CHURCH.

GRINDING MACHINE.

PatentedApr. 3, 1894.

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' which- ...l3`o View of the dial-holder.

TED STMiE-S.`

PATENT u i DUANE H. CHURCH, or ArnwToN, MASSACHUSETTS.

sPEcIFIcATIoH arming part of Letter-spannt Nb. 517,643, dated April 3, 1894. i

y Application filed .l'unc23,1893.l

serial No. 478.613. (No maar.)

To al@ whom/ it may concern.- n I vl Be 1t known that I, DUANE H. CHURCH, of

Newton,in t'he'county of Middlesex and State v March 21, `1893.

derstood, I win proceed to describe itwith holder in elevation.

reference to the accompanying drawings, of

Figure 1 represents a plan ofa machine constructed according to my invention, and

-\ designed for grinding disks such as watch 25 dials. Fig. isa front elevation, partly in section.. Fig. 3 is an end elevation. Fig. 4

is a vertical cross-section, taken through the middle of the machine, bnt'showin'g the dial- Fig. 5 shows a horizontal section.A Fig. 6 shows a detail sectional Fig. 7 shows a sectional vdetail of parts appearing at the left of Fig. 5. Fig. 8 shows a sectional view ot a machine embodyingjthe invention and de-l signed for grinding elongated bodies. Fig. 9 .shows a section on line 9'-9 of Fig. 8. Fig.

1 10 shows a sectional View of parts appearing n is' in Fig. 8. Fig. 11 shows an end view, as seen from the rightof Fig. 8. j

The same numerals and letters of reference indicate the same parts in all the figures.

Referring first to'Figs. 1 to 7, the frame of f the machine consists of a bed A1, supported by .leg's 2, 3. r Mounted on the bed 1 are slides 5, l .6,.constructed to carry'and support shafts 7 l8, providedattheir inner'ends with holders 9 lfoi-carrying the substance-desired to form the grin'ding-surfac'e. In a machine of the character V,shown in'Figs. 1 to 7, it is desired to use emery laps 10 for thispurpose, whichY serve'at the same time as housings to'lconl vfineany dust or kparticles removed -during fers is a pan p, from which extends a duct d, 'for receiving and carrying onf water which is supplied during the grinding operation. l

` YMounted yon the bed 1 is a standard 14, whioh'supports and carries the dial holding and operating devices 12 13which-are or may be of any suitable construction. When used forgrinding watch-dials, it is preferred Kthe grinding operation'. Beneath the grindthat the holding devices 12 13 be' obliquely disposed in relation toi the shafts 7 8 to an eX- Ytent corresponding to the desired bevel to be vgiven to the periphery of the dials..

The dial-holder is pivoted at 67, so that it may be raised and lowered in removing and replacing the dials, and'provision is made for cushioning the up and down tstroke, as fol-y lows: The holder is connected by a vertical rod 68 with a piston 69 lin an air-cylinder 70. A plunger-rod 7 l, connected with said piston, extends out yofthe bottom of the cylinder, and connects with a treadle or other suitable power-applying agent. A spring 72 bears at one end against a shoulder 7 3 on the plungerrod, and at the other end against the cylinder 70, whereby it cushions the upward stroke of the plunger-rod. The return or downward movement of the piston iscushioned by the air in the cylinder. l

Shafts 7, 8, together with 10, are driven from any desired source by pulleys 15 1 6 respectively.

Mounted'in carriagesA 60, on the under side of the bed 1, are two vertical shafts 17, provided with arms 18.19 Sat their upper and lower extremities respectively. The arms 18 vextend inward (between the grinding-surfaces 10)- and 'are provided on their extremities withdiainond stops 18', and said arms 18 are placed" to bring the. stops 18Yat ya-distance apart corresponding with the'desired diameter of the dial to be ground. Thus the stops i act asa c'alipers for measuringvjeach dial, ffor ythe grinding of the dial continues until the faces10 come-in contact with'the stops18,

at which point the` grinding ceases, as hereinf l after explained. The arms'19 are normally in electrical contact with electro-.magnets 19', and are separated from the latter to break the connection by the contact of the stops 18 with' the grindingsurfaces 10.

'.I 'The carriages 6,0r are connected together byr 'holders 9 and laps y IOO a rod G1, having right and left hand screwthreads engaging the carriages respectively, whereby, when the said rod is turned in one direction, the carriages will be moved toward each other; and, when the said rod is turned in the opposite direction, the carriages are moved away from each other. Thus, by turning a knob 62 yon the end of said rod, the arms 18 may be adjusted for dials of diiierent diameters. Each of the carriages is provided with a screw 63, which projects through a slot in the bed 1, and has a head (il, whose under side is pressed by a fiat spring 65 in a groove in the bed. displacement of the carriages after adjustment is prevented. The electro-magnets 19 are carried by the carriages 60, and hence the relation between them and the arm 19 is not disturbed by adjustment of the carriages.

The slides 5, G have a longitudinally reciprocating motion, moving simultaneously toward and away from each other. The movement of the slides is effected through the instrumentality of sleeves G4', mounted to turn in bearings in the bed l, and engaging screws 65 on the slides. Gears 73 are fixedly mounted on the sleeves G1', and they mesh with gears 74 mounted on a counter-shaft 75. These latter gears 711 have a frictional connection with the said countershaft, whereby they may, under certain conditions, turn independently thewreof. Each of the said gears is held between disks 76, keyed to the shaft, and faced with a material suc-h as leather, so as to create friction between them and the gear. One of these disks is spring-pressed against the gear, as shown in Fig. 5.

Motion is transmitted from the drivingi shaft 77 to each of the gears 74, through the following-described mechanism: A hollow shaft 78 is supported in stationary bearings, and carries a gear 79,'meshing with the gear 74, and one member 80 of a friction coneclutch, the other member 80 of which is mounted on the driving-shaft. The shaft 78 is permitted a slight endwise movement to lock and release the clutch. A rod 8l occupies the bore of the shaft 78, and is pressed against the end of the driving-shaft by a spring 82, bearing at one end against the rod and at the other end against a screw 82' fastened in the end of the shaft 78, whereby said spring tends to separate the members of the clutch. The member 80 of the clutch contains an electro-magnet S3, and the member 80 constitutes an armature to be acted upon by said magnet and drawn into frictional engagement with the member 80.

The main-shaft'77 is continuously driven through any suitable means, such as worm 84 and gear 85.

The machine may be wired in any suitable manner so that an electrical circuit may be established through the magnets 83, and the gage devices may constitute switches by which to cut said magnets in and out. In

the present instance, a source of electricity,

By this means, accidental' as a battery, is indicated at 86, and connected with the magnets 19 and 83 respectively. The magnets 83 being rotary parts, the con nection is a sliding one, consisting-of an electrode 87, contacting with an annular surface 88 of the magnet-casing. The circuit is completed by connecting the arms 19 of the gage devices with the magnets 83. As here shown, this connection is indicated as being with the clutch parts or armatures 80.

The extent of normal movement of the grinders, according to the diameter of dial desired, is regulated by means of a disk 88', mounted fixedly on the end of the countershaft 75, and a stop-arm 89, fastened at one end to a fixed part of the machine and arranged to give or yield in one direction only. The disk 88' is provided with an annular series of perforations 90 and stop- pins 91 and 91 may be removably inserted in said perforations so as to project from the inner side of the disk and encounter the stop-arm 89. A weight (not shown) is suspended by a flexible connection 93 from a grooved pulleySl-t on the shaft 75, and tends to rotate said shaft in a direction which will cause the pin 91 to bear against the under side of the stop-arm 89, as shown in Fig. 3. The pin 91 is set to permit a rotation of the counter-shaft to the extent necessary for a normal movement of the grinders to grind a dial to the desired diameter, the rotation of said shaft being stopped by the pin 91 encountering the upper side of the stop-arm 89. The impact of the pin 91 against the stop-arm, upon the return of the shaft by the weight on the cord 93, is cushioned by reason of the yielding property of the said stop-arm. Y

The operation of themachine is as follows, assuming that, imprimis, the grinding-surfaces 10 10 are fresh and not worn. Themachine having been adjusted to the desired diametrieal size of dial, the dial to be operated upon is placed in the holders 12 13, the slides 5 G being separated, and the electrical circuit is established by bringing the arms 19 into contact with the magnets 19', andthe attractive power of the latter will hold the gage devices (comprising the arms 18 and 19) positively in this adjustment, and prevent accidental displacement. The magnets 83 now being excited, lock the clutches, so that the shafts 78 will turn with the driving-shaft 77.`

The machine being set in motion, the dialholder revolves the dial at the desired speed, and the main-shaft 77, through the gears 79, 74 and 73, revolves the sleeves G21, and thereby moves the grinders toward each other, by the engagement of said sleeves with the screws G5. The grinding-surfaces 10 grind down the periphery of the dial until said surfaces encounter the stops 18. Vhen this occurs, the dial will have been reduced to the proper diameter, and the grinding ceases by reason of the arms 18 being moved toward each other, thereby moving thearms 19 away from the magnets 19 and breaking the cir- IOC IIO

=- the electrical circuit remains unbroken, and

` 517,643 o l "s cuit, thus rendering the magnets inactive, and permitting the springs 82 to disconnect lthe clutch-parts, so that the shafts 78 are no longer rotated by' the driving-shaft 77. Si-

multaneously with this action, the stop-pin 91 a encounters the arm 89, and stops the countershaft 75 which has been rotating with the tion of the grinding-surface 10, and hence, inl

. grindingthe nextdial, in order to bring it to the same diameter as the first one, the grind-vv ers must move toward each other to an extent as much greaterthan in the lirstinstance as the amount of grinding-surface worn away during the grinding of the first dial. When the grinders arrive at thevpoint where they were stopped in grinding the ,first dial, the' stop-pin 91 encounters the arm 89, as before, and stops the rotation of the counter-shaft 75. But, by reason ofthe reduction in the grinding-surfaces 10, they will not have encountered the stop 18 when this takes place, hence the clutches are still locked by the inuence of the magnets 83, and the rotation of the shafts 78 vcontinues, and the grinders are moved farther toward .each other, the frictional connection ofv the gears 74 with the counter-shaft permitting said gears to continue to turn, while said shaft is held stationary, said gears slippingbetween the disks 76. The movement of the grinders upon the dial continues'until the grinding-surfaces encounterthe stops 18', when Vsaid grinders are stopped and run back, as before'. The second dial is now complete, and is of an exact size' with the previously-ground one. The operationmaybe continued until the emery laps 10 :are completely worn away, and the disks ground `will all be of a uniform diameter.

The machine could be so arranged that the diamondstopslS would yrest uponthe periphery ofthe disk being ground, and breakv contact when the desired' size was attained, thus stopping the electrical feed and the forward motion of the grinding-lap.y

I do not confine myself to the exact means s howuand described for takingv up the wearl of the grinding-surfaces, -as any suitable mechanical meansv couldvbe substituted for those Q shown. p

The invention is not limited to the conjoint use ofthe two .grinding mechanisms here/` shown, and one of said mechanisms may be omitted without departing from the spirit of the invention.`

' be effected may be variously modified, and I do not confine myself tothe particular organization and details ofmechanism `here shown.

Figs. 8, 9,110 and 11 illustrate aconstruction by which thel invention may be embodied in a machine for grinding lelongated bodies.v

mounted in a suitable manner so. as to be capable of traveling back and forth across the grinding-lap 102. This grinding-lap is in the form of adisk, which is mounted on a slide 103. The stop-arm 104 is carriedV on an auxiliary slide 105, and has a diamond point 106 for contact with the periphery of the emery-lap 102.A The slide 105 is mounted to move overthe slide .103, and the two slides are driven by one screw-shaft 107, having screw-threads of diferent'pitch engaging the slid-es respectively, whereby the'slide 105 will move twice as fast as the slide 103. The screw-shaft is driven through its primaryA movement, andthrough its movement which compensates for.the wearing away of the emery-lap, by mechanism of similar construction and arrangement to that already described withreference to the other figures. In view of the fact that an elongated body is under` treatment, and to be reduced to a uniform size throughoutits length, the grinding-lap must be held up against the work for, al certain length of time after the piece hasbeen reduced to the desired diameter at one end.-V This may be accomplished by the construction here shown, in which` a divided counter-:shaftI 108 has'its endsfrictionally connectedby means of suitably-constructed heads 109 and 110. The head 110 comprises a drum, on which a cord or like exible device 111 is adapted to be wound, said cord having a weight yattached to its end, and arranged to turn back the feeding parts after one piece has been ground. The driving. shaft112 is connected with the right-hand member of the divided counter-shaft, by

roo f vgears 113114, an electric friction-clutch 115 of a construction similar to that vbefore described being inserted in the driving-shaft. A perforated disk 116 is fastened on the end of the divided counter-shaft, and receives a stoplpin 117, to throw the feed parts out of mined time. Y

A stop-arm 118 is-pivoted to the end of the machine-frame, and extends behind the disk 116 and into the path of the pin 117, and may Y move to a limited extent on its pivotbetween stop- pins 119 and 120, so as to be utilized as a switch to cut out theclutch 115. A spring 121 is connected at one end with the arm 118, at a point infront of the pivot thereof, and

vsaid spring is connected at its opposite en'd with a stationary support 122.v It will be Seen that said'spring will act to hold'the pivoted arm against oneor the other'of the tixedstops 119 or 120, and, as soon as the arm is moved over the center, said spring quicklycarriesit against the fixed stop. The upper stop 119 is lgear with the driving-shaft at a predeterizo Vthe, terminal of an electric circuit, which includes the clutch 115. The other terminal of said circuitisthe arm 118. 'l Saidarm carries a 119. When the lgrinding operationbegins,the arm 118V is' in electrical engagement with the spring'clip 123, for engagement with the stop'v stop 119, and the circuit is closed and the clutch locked. The pin 117 is set to permit a continued movement of the right-hand memberot the shaft 108 afterihe left-hand member has been stopped bythe pin in the disk 88*c0ming against the stop-arm, as in the form of machine Iirst described, the continued movement being sufficient to allow for the length of the work under treatment. It will now be seen that, after the primary feed and the Wearcompensating feed have been effected, the emery-lap is still held u p against the work, as the cord 111 is still being Wound upon the head 110 as the latter is driven from the shaft 112 through the gears 113 and 114, and the frictional contact of the heads 109 and 110 prevents the left-hand member of the counter-shaft from turning back. This continues until the pin 117 encounters the arm 118 and moves it over the center, whereupon the spring 121 throws the arm against the fixed stop 120, and the circuit is broken by the disconnection of the clip 123 and terminal 119. As soon as the circuit is broken, the clutch 115 is released, and the weight ou the cord 111 turns back the feed-parts, the two members of the counter-shaft turning together,-by reason of the frictional engagement of.the heads 109 and 110,-until the left-hand member is stopped in the manner described with reference to the rst form of machine. The

right-hand member continues to be turned back by the weight, until a pin 125 in the disk 11G encounters the stop-arm 118, the head 110 slipping on the head 109. Said pin 125 moves the arm 118 over the center, and the spring 121 draws it against the stop 119, and the circuit is again closed.

It is evident that other constructions might be employed to accomplish the compensation for length ofthe work, and hence the invention is not limited to the particular construction shown.

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

A grinding machine comprising in its construction a movable grinder, feed mechanism for advancing the same upon the Work, means controlled by the grinding surface for rendering said t'eed mechanism inoperative, a retractiug agent which constantly tends to Withtwo subscribing witnesses, this 17th day of June, A. D. 1893.

DUANE 11. CHURCH. Witnesses:

C. F. BROWN, ARTHUR W. CRossLEY.

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