US2327255A - Cylindrical grinding machine - Google Patents

Description

ulg- 17, 1943- c. G. FLYGARE ET AL 2,327,255

CYLINDICAL GRINDING MACHINE EHRL EFL YEHRE .ETE WHR T .5M/:WER

Aug 17', 1943- c. G. FLYGARE vET AL 2,327,255

CYLINDRICAL GRINDING MACHINE Filed March '7, 1941 4 Sheets-Sheet 2 lo 33%/ I Mwaun. www

ug- 17,1943- c. G. FLYGARE ET AL CYLINDRICAL GRINDING MACHINE Filed March 7, 1941 4 Sheets-Sheet 3 C'F/'RL GFL YEHRE 57.15 WHA/'T5 MHD ER F575 Aug. 17, 1943.

C. G. FLY`GARE ET AL GYLINDRIQAL GRINDING MACHINE 4 Sheets-Sheet 4 Filed Mazrch 7, 1941 Patented Aug. 17, 1943 OFFICE' Y CYLINDRICAL GRINDLQG MACHINE Carl G.Flygare andStewart S. Mader, Worcester,v Mass., assignors to .Norton Company, Worcester, Mass.,` a' corporation of Massachusetts I Application March 7, 1941,v Serial No. 382,200 Y,

8 Claims. (Cl. 741-727) The invention relates to grinding machines, and more particularly to an improved cylindrical grinding machine.

One object of the invention is to provide a simple and thoroughly practical cylindrical type grinding machine. Another object of the invention isV to provide an improved table traversing and reciprocating mechanism. Another object of the invention is to provide a table reversing mechanismwith an adjustable dwell control mechanism. Another object of the invention is to provide a table reversing mechanism with an adjustable dwell control mechanism whereby a variable dwell may be obtained at each end of the table stroke. Y

A further object of the invention is to provide a table driving and reversing mechanism having a reversing clutch and a stop and start clutch with a dwell control mechanism which controls the stop and start clutch at reversal to provide a predetermined table dwell which is independent of the action oi the reversing clutch. Other objects will be in part obvious or in part pointed out hereinafter. Y Y

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims. l

In the accompanyingA drawings, in which is shown one of various possible embodiments of the mechanical features of the invention,

Fig. 1 is a front elevation of the improved grinding machine; v

Fig. 2 is a fragmentary horizontal sectional view, on an enlarged'scale, of the table reciprocating mechanism and the `manually operable traversing mechanism;

Fig. 3 is a fragmentary vertical sectional view, on an enlarged scale, taken-approximately on the line 3--3 of Fig. 1;

Fig. 4 is a fragmentary vertical sectional view, on an enlarged scale, through the reversing f lever;

Fig. 5 is afragmentary iront elevation, on an enlarged scale, of the table controlling mechanism; Y f

Fig. 6 is an electrical Wiring diagram of the table dwell control mechanism;

Fig. '7 is a fragmentary longitudinal sectional View, on an enlarged scale, through the table reciprocating and reversing mechanism; and

Fig. 8 is a fragmentary cross-sectional view, on an enlarged scale, taken approximately on theline 8-8 of Fig.Y 1, through the table reversing mechanism.

A grinding machine has been illustrated in the drawings, comprising a base I0 which supports a longitudinally. reciprocable work supporting table II on the usual at way, I2 and V-way I3 for a longitudinal reciprocatory movement relative to the base I0. The work supporting table II is provided with a rotatable Work support, comprising a headstock I4 and a footstock I5 Which are provided with work supporting. centers I6 and Il,`respectively. The headstock `I4 is preferably a motor driven headstock, in which an electric motor I8 is mounted on the upper surface of the headstock I4. The motor I8 is connected by a belt driving mechanism (not shown) contained within the belt guard IS which serves to drive the Vheadstock spindle (not. shown) having a face plate 20 mounted on its 'opposite end. The face plate 2Il is provided with an adjustable Work-driving pin or stud 2| which is arranged drivingly to engage either a projection ofthe Work piece or a Work driving dog 4which is clamped adjacent to the left-hand end oi a workpiece.

Y The, basel I0 also serves as'afSllDpOrt for a transversely movable wheel, slide 25 which Ais arranged to move transversely relative to the base on the usual Well known V-way and at way (not shown). The Wheel slide 25 rotatably supports a wheel spindle 25.in suitable bearings (not shown) which serves as a support for a grinding wheel 2l. The grinding wheel 2 1 and its supporting spindle 26 are preferably motor driven by meansoi an electric motor 28 mounted on` the upper surface of the Wheel slide 25. The

lmotor 28 is connected vby a belt driving mechanism (not shown) contained within a beltguard 29.V The wheel slide 25 may be fed transversely relative `to the base I0 by the usual and well known nut and screw feed mechanism which may be actuated either manually or by power through a manually operable feed'wheel 30 mounted thefront of the machine base. i

VA table reciprocating and wheel feeding mechanism is supported within a casing or'apron 3l which-is fixed tothe front of the machine base This apronf3I contains av power operated table reciprocating mechanism, a manually operable table traverse mechanism, and. a wheel feeding mechanism.

vThe table II may be traversed longitudinally by means of a manually operable mechanism, comprising a rack bar 35 dependingV from the under side of the table II V'I'he rack bar 35 meshes with a gear which is supported on a shaft 3l journalled in bearings 38 and 39 (Fig. 8)` which are in turn fixedly supported within the casing 3i. The shaft 3l .also carries a Worm gear di) which meshes with a rotatable worm 1li. The worm :il is journalled in bearings 42 and d3 in .the housing or apron 3|. A manually operable traverse wheelli!! which is mounted on the. outer end of a Ashaft l5 is provided. The shaft d carries a gear it which meshes with a gear l? carried-by a rotatable shaft 48. The gear li'l meshes with a gear it which is rotatably supported on a shaft 56. provided with an integrally formed clutch member 5i. The clutch member '5i together with the gear 49 are journalled in an anti-.friction bearing t2 carried by the apron Si. The rear end of the shaft 5t is supported by an antifriction bearing 53. A bevel gear 5d is mounted on the rear end of the shaft 5% and meshes with aV bevel gear E5 which 'is fixe'dly mounted on the worm shaft 4l. f

A clutch member 5t is slidably keyedto the shaft jet. In the position shown in Fig, 2, the clutch is engaged with the clutch member. 5l so that ka rotary motion of the manually'operable traverse wheel 44 is transmitted through the gear 46, the gear 4l, the gear GS, through the clutch members EL-t, to rotate the shaft 5d, and through the bevel gears 54 and 55 to rotate worm l. YThe rotationof the worm -Gl is transmitted through the worm gear lit?, the shaft 3l', the gear 36, andthe rack bar 35, to produce a longitudinal traversing movement of the table l l. The direction of traversing movement of the table H'is determined by the direction vof rotation of the manually operable traverse wheel 4Q;

The clutch member f is arranged to be shifted automatically in a manner to be hereinafter described by means of a yoked member 51 which is provided with diametrically opposed studs 58 engaging a groove 5d formed in the clutch member 5d. The yoked member E'l-is supported on a rock shaft iiiJ. A lever/Cl is also flxedly supported on the rock shaft 68 and is arranged to be actuated automatically in a `manner to be vhereinafter described to render the manually operable., traverse mechanism inoperative 'during power traverse of the table and vice versa.

A reversinggmechanism is provided, comprising a pivotally Amounted reversing lever 65 which is xedly mounted on the outerend of a rock shaft (Figs. 1 and 5). .The reversing lever 65 isarranged to be shifted either in a clockwise or countercloclwise direction by'meansA of a pair `@f adjustably mounted dogs 6'! and 68 which are arranged in the path of a stud E9 carried bythe reversing lever E5. The roclrshaft 66 supports a downwardly extending arm 'it (Fig. 8) which is arranged to shift a Vyoke-shaped member 'H longitudinally when the reversing lever 65 is actuated by the table dogs 6l and 68.. The yoke-shaped member 'll is arranged to straddle` or engagea groove 'i2 formed inthe periphery of a slidably mounted `clutch member "i3, The clutchmember 'S3 is slidably keyed on a rotatable shaft 14 which is journalled in anti-friction bearings 'land 16 (Fig. 7). l'

When the clutch member i3 is'shiftedy toward the right (Fig. 7), it engages vor meshes with clutch teeth 'l formed integral Vwith a gear '18. The gear 'i8 is rotatably supported relative to the shaft lil-and meshes with agear 'I9 which is keyed to or formed integral with a sleeve 8G. The sleeve 89 is keyed to a reduced portion 8l of the Cil' worm shaft di. The outer end of the reduced portion Sl is supported by an anti-friction bearing S2.

When the clutch member 'i3 is shiftedtoward the left (Fig. 7), the clutch teeth on the lefthand end of the clutch member 13 are shifted into engagement with a set of clutch teeth 83 formed integral with a gear VE541 which is in turn rotatablysupported on the. shaft '14.' The gear 84 meshes with an idler 'gear 85 which in turn meshes with a gear which is formed integral with the sleeve Eil, It is readily apparent from lThe gear 49 is x the foregoing disclosure that when the clutch v member 'ES is shifted toward the left (Fig. 7), a

rotary motion is transmitted by the shaft lll, through the clutch member "e3, through the clutch teeth S3, the'gear 64, the idler gear 85, and the gear 8d, to rotate the sleeve t@ in the reverse direction.

` A power operated driving mechanism is provided for. rotatingthe shaft 14. vThis mechanism may comprisea change speed gear unit Sil `which is xedly mounted within the base lil of the machine. Power is supplied to the change spee gear unit El@ by means -of a driving belt 9| from any suitable source of power such. as, for exam-Y ple, an electricV motor mounted on the rear of the machine base i5. The driving belt il drivingly engages a pulley 92 mounted on the right-hand end of a rotatable shaft S3. The shaft 93 is journalled at one end in an anti-friction bearing 94 supported in the casing Qi?. rlhe other end of the shaft Bills journalled in abearing S5 formed in the hollow end of a rotatable shaft 5G. A clutch member 9'! is slidably keyed on the shaftt-f. A gear Si) is formed integral with the clutch member ,9i andis arranged to be t rewninto or out of mesh witha gear 95.5 which is keyed tothe right-hand end of arctatable shaft ll; The shaftl lil is journalled in anti-friction bearings Hlland l2, 'respectively, which are :supported in the housing 13.- A gear ESS is fori ed integral with Vthe shaft It@ and meshes with al gear 94 which is keyed to the right-hand end of the shaft S6. The clutch member 9i is-provided with clutch teeth whichare arranged to be thrown into or lout of meshA with clutch teeth m6 formed integral with the gear |524. f

t Itwill be readilyl apparent from the foregoing disclosure that when the clutch member S1 is movedtoward the. left, the shaft 93 will be connecteddirectly tofrotatethe shaft 95 at the same speed.y If a reduced or slower speed is required on the shaft 95, the clutch-member 91 may be moved toward the right (Fig. 7) to throwthe gear Sil into mesh with the gear 99 so that the rotary motion of the shaft Ais. transmitted through the gear the gear 99, the shaft |09, and the gear i533, to rotate the gear i3d and the shaftll at a reduced or slower speed. Aman ually operable clutchshifting lever l I6 is provided on the front of the machine base. The lever I i5 is operatively connected to actuate the Yclutch member @l so'that either a fast or a slow speed may be provided to traverse or reciprocate the work supporting table H at either a fastv or a slow speed as desired. l A

The right-hand end of the shaft S6 is rotatably supported by an yanti-friction bearing lill (Fig. 7) carried by the'casing 9G. The other end of the shaft QG is rotatably journalled ina bearing sleeve lirformed in al hollow end' port-ion of a rotatable shaft |09.k rlille shaftfi is iournalled in an anti- `friction bearing li lil sup-ported in the casing 90.

Theshaft |69l serves as a support for a slidably of engagement with clutch teeth ||3 formed on al clutch member H4.' lThe clutch member ||4is xediy mounted on the right-hand'end of the shaft 14 (Figs 1). The clutch member III togetherwith its associated .parts serves as awstop and start clutch whereby the reciprocatory movement of the work supporting table II maybe stopped or started when desired. A manually operable clutch shifting lever is pivotally mounted on the front of the machine base and is operatively connected' t0 actuate the clutch member to stop'and start the table move-- ment as desired. Y g Y The stop'and start lever |I5 is pivotally supported on a stud ||1 which is'supported by a bracket vIl xedly mounted on the apron 3|'. The lower end of the lever ||5 is connected by means of a stud |I9 withfthe left-hand end of a' slidably mounted plunger (Fig.`3) which is journalled in a bearing |2| formed inthe apron 3|. The inner end of theplunger |20 is operatively connected by a stud |22 with a rock arm |23. The rock arm |23 is pivotally supported by a stud |24 which is xedly mounted within the apron 3|. The lower end of the rock arm |23 is provided with a transversely extending slot |25 within lwhich ts a spherically shaped'stud |26. The stud |26 is xedly mounted to apivotally mounted plate |21-which is in turn supported by a stud |28 (Figs. 2 and 5). The stud |28 is iixedly mounted within the apron 3|. A yoke-shaped lever |30 is pivotally supported on a stud |3| (Fig. 3) which is xed relative tothe apron 3| and the base I0. The yoke-shaped'lever E30-is provided with shoes I32`and |33 which are arranged to-ride within a groove |34 formed inv the periphery of the clutch member I||; The yoke-shaped lever |30 is provided with a downwardly extending arm |35 which supports a roll-` er |36 at its lower end. The roller |35` is arranged in the path of a cam face |31 formedfon the pivotally mounted plate |21. c Y

It will be readily apparent from theforegoing disclosure that when the stop and start lever |I5 is rocked'in a clockwise direction into the position illustrated in Fig. 3, the plunger |20 will be moved toward-the left, which'movement serves to rock the rock arml23 in a clockwise direction` (Fig. 3). This movement ofthe rock arm 23 serves through the sphericallyA shaped stud |26 to rock the plate'l21 in a clockwise dihold the stop and start clutch member in an engaged positionto reciprocate the table IIby poweriv- When the cam plate |21-|31 moves,

into the positions illustrated in Figs. 2, 3 and 5, the yoke-shaped member |30 is moved against the tension of the 'spring I4I.Y v

YWhen itis desired to start reciprocation of the table by power, the operator grasps the knob at the upper end of the lever ||5 so as to release theV latch |38 and then swings the lever` ||5 in Y a counterclockwise direction (Fig. 3) which movement shifts the plunger |20 toward -the right to rock the rock armV |23 in a counterclockwise direction. This movement of the rock arm |23serves to rock the plate |21 in a counterclockwise direction (Fig. 2) Vso that the cam face |31 moves away from the roller |36, thus releasing the tension of the spring |4| which serves to throw the clutch member toward the leftV (Figs-2, 5 and 7) into an engaged position to start the power traverse or reciprocation of the Work supporting table Y It is desirable to provide a suitable interlocking mechanism between the stop and start clutch ||I foractuating the table by power and the clutch 56 for engaging or disengaging Ythe manually operable traverse wheel 44. The plate |2`1 rection (Fig. 2) during [which movement the cam face |31 engages the Vroller |36 and rocks the yoke-shaped lever |30 in a. counterclockwise direction (Fig. 5) which movement shiits'the stop and startl clutch member lll'toward the right to disengage the same, thus stopping the traversing or reciprocating `movement of the work supporting table II. i

A spring-pressed pivotally mounted latch member |38 is supported on a stud |39 carried by the lever I I5. The latch member |38 is arrangedto engage a latch pin |3|'|aV which is iixedly supported on the apron 3|.4 The latch member |38 is yieldingly held in the position illustrated in Fig. 3 by means of a compression spring |40'and serves normally to hold the'lever H5 in a position to hold the stop and start clutch I in a disengaged position so that the table is not moved by power. nected between a stud on the yoke-shaped lever |30 and a stud which is fixed within the apron 3|. The spring |4| serves normally totendfto A tension spring |4| (Fig. 5) is con- (Fig. 2) is provided with a rearwardly projecting arm which is connected by a stud |46 with one end of a connectingrod |41. The other end of the'connecting rod |41 is pivotally connected by-a stud |48 with the arm 6| (Fig. 2) which actuates the clutch member 56 for rendering operative or inoperative the manually operable hand wheel 44. In the position of .the parts as shownl in Fig. 2, the power traverse mechanism is disengaged, that is, the stop and start clutch is shifted to its right-hand disengaged position -and the clutch member 56 is engaged with the clutch teeth 5| so that the manually operable hand traverse wheel 44 is rendered operative. In this position of the parts, the table |I may be traversed longitudinally by rotation of the manually operable traverse wheel 44, and the direction of movement of the table I is determined by the direction of rotation of the hand wheel 44. Y Y

When it is desired to start the power traverse or reciprocation of the table II, the stop and start lever ||5 isshifted from the position shown in Fig. 3 in a counterclockwise direction, which movement rocks the plate |21 (Fig. 2) also in a counterclockwise direction, thus releasing the tension of the spring |4| to throw the stop and start'clutch member into operative engagement so that power will be transmitted through the gear mechanism to reciprocate the table At the same time the plate |21 is moved in a counterclockwise direction, the connecting rod |41 is movedtoward the left, which movement rocks the lever 6| and the yoked member 51 in a counterclockwise direction to throw the clutch member 56 upwardly (Fig. 2) into a disengaged position, thus automatically rendering the manually operable traverse wheel 44 inoperative during the power reciprocationv of the table Similarly, when the stop and start lever ||5 is moved into the position illustrated in Fig. 3 to disengage the clutch the rod ||4 automatically shifts the lever 6| and the yoke 51 automatically to engage the clutch member 56 with the clutch teeth 5|, thus automatically rendering the manual traverse wheel 44 operative.

The table reversing mechanism is provided with a load and fire mechanism whereby the reversing and `the plungerflj to close the normally open 'reversing leverfand clutch to `reciprocate said 'limit switch' 4|15 to- 'energize the solenoid |153, table, a driving mechanism including a start thereby disengaging the stop and start clutch and stop clutch'to drive said reversing clutch and and at the saine time `setting the electric time table, means including a control lever to engage relay lli!A in motion.` The table dwells at the 5 `said lstart andl stop' cli/itch,v a solenoid operatively end of-its reciprocatory stroke for a predeterconnectedt-c disengage said start and stop clutch, mined time interval to allow the grinding wheel and means including a switch actuated by and to grind around the end portion of the work in timedrelation with movement of said reverspiece, as governed by the setting of the time deing lever to energize said solenoid so as to dislay relay |18. After the predetermined dwell inengage said start and. stop clutch for a predeterterval has elapsed, the time relay |18 operates to mined time interval.

break the circuit so as to deenergize the sole- 5. In a grinding machine having a base, a lonnod |15, thereby releasing the tension of the gitudinally reciprocable table, means including a spring il which serves to shift the stop and reversing clutch to reciprocate said table, a table start clutch ll rapidll7 lltO engagement to start L5 actuated reversing lever and a load and ire mechlle liable ll mOVDg in the reverse direction. It anism automatically to shift said reversing clutch Will be leedly appa-rent IOm the fOlegOlg dlS- into a reverse position at the ends of the table closure that the time interval o1' dwell may be stroke, a driving mechanism including an indereadily controlled by manual adjustment 0f the 'pendent start and stop clutch to drive said retime relay |18. 20 versing clutch and table, means including a con- The clutch member ll I is interconnected with rol lever to engage Said start and Stop clutch, a the clutch 56 So thatA When the SOP and Start solenoid operatively connected to disengage said clutch is in position for driving the table Start and Stoprclutgh duringrthe period of reby DOWeI, the Cluteh 55 Will be disengaged, thus versal, means including a switch actuated by and rendering the manually Operable leVeTSe Wheel in timed relation with movement of said revers- 44 lnopelalve. Slmllelly, Wllel the Step und ing lever to energize said solenoid to disengage Steril CluCll lll iS mul/@Cl t0 a dlsugaged I JOS said stop and start clutch, and means including tion, the Clutch Wlll be automa-lllcally shifted. arl electrical time delay relay vhch is set in m0..

into an engaged position so that the table E! may tion by the Switch to @energize the Solenoid be manually tml/@Tseu and adjusted by rotatlol'l 30 after a predetermined time interval automatical- Of the manually Operable trailers@ Wheel ttl ly to engage said start clutch to Start the table It Wlll thus be Seen that there has been Pto in the reverse direction after a predetermined vided by this invention apparatus in which the period of dwell; v

various objects hereinabove set forth together (i In a grinding machine having a base, a 1On With many tllofuughly Practical advantages at@ gitudinally reciprocable table, means including a Successfully achleted- AS many possltle em" reversing lever and clutch to reciprocate `said bodtments may be madtvof the tov? intention table, a `driving mechanism including a start and amt as man3 Changes might te mad? m the em' stop clutch to drive said reversing clutchy and bodiment above set forth, 1|; 1s to be understood table yeldable means-normally to maintain Said that all matter betet Set forth et. Shown in the 40 clutch engaged, a cam operatively connected to accompanymg dtawmgs 1S to be mtetpteted as disengage said clutch. a control lever to actuate illustrative and not in a limiting sense.

We C1am y said cam, a Vvmanually operable table traverse 1 mechanism, a clutch interposed between said In tl' gtmdmg machine havmg a base a lon mechanismA and the table and operative connecgitudinally reciprocable table thereon, means intions between Said can. and Said latter Clutch au;

ducting a tevetsmg lever and clutch to. recitato tomatically to render said-manual traverse mechcate said table, a driving mechanism including anism* Operative Wen Caid 622m is moved to dis a start and stop clu ch to drive said reversing Y clutch and table, and means actuated Vautoengage Sald Start and stop Gluten' 7. In a grinding machine havin `a base, a lonm'atlcauy 1.11 tlmed relation Wlth movement of 50 gtudinally reciproca-ble table, meins including a Sad tevetsmg lever to dlsengage Sad Statt and reversing lever and clutch to reciprocate said stop clutch during table reversal for a predetertable a driving mechanim mcmdin a Start and mined period of dwell. m g

2. In a grinding machine having a base, a longitudinally reciprocable table, means including a reversing lever and clutch to reciprocate said table, a driving mechanism including a stop and start clutch to drive said reversing clutch and table, means actuated automatically by said reversing lever to disengage said stop and start clutch during table reversal, and. means automatically to engage said start and stop clutch after a predetermined time interval. l gage Said Stop and Start Clutch.

3. In a grinding machine having a base, e lon 8. In a grinding machine having a base a longtudlnally teclptocttt'te table= means including a 65 gitudinally reciprocable table means including a revers-'lng lever and Clutch t0 reciprocate Sald- 1' reversing clutch to reverse thetinovement of the table a power Operated driving mechanism ttl table, a table actuated reversin.or lever to actuoluding a start and stop clutch to drive said Ie ateV said clutch, a load and re mechanism to Velslug Clutch and table, uml an elettlcftlly aC v, shift said reversing clutch rapidly into a reverse tuulled dwell @Onl'fol mecllaulslu WlllCh 15 actuposition, a driving mechanismincluding an inated by and in timed relation with movement o vdepement Stop and Start Clutch to drive Said re said reversing lever to disengage said starty an A ,ersmg clutch and table, a manually Operable S1301) Clutch OI" a predetermined time l'lteVeL, y. lever to actuate said start and stop clutch, and

4. In a grinding machine having a base, a lonl an automatic dwell control therefor including a gltudlnally reClDl'OCable table, means melufllg 2y A7e Solenoid operatively connected to disengage said table, a spring normally to maintain said clutch engaged, a cam operatively connected to disengage said clutch, a control lever to actuate said cam, a manually operable table traverse mechanism having a clutch interposed between the mechanism and the table, and operative connections between said cam and said latter clutch automatically to render said manual traverse mechanism inoperative when said cam is moved to enstop clutch to drive said reversing clutch andV start vvand stop clutch,V an adiu'stable .electric time said relay being .arranged .after a :predetermined relay operatively .connecteditherewtheand almit time interval to .deenergze saidsolenoid. Vthereby .switch actuated by movement cf said reversing engaging said stop clutch yto .start the table in leyer whichv is operatively `comrlected to .energize Vthe reverse drecticn. saidsol'enoid yand simultaneuuslylto Start the time 5 CARL G. ILYGARE. relayto' Vdisengzigesaid stop clutchio cause canpxle- S'IYEWART S. MADER.

.determined dwell 4at Athe .endrf .the table stroke,

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