US1324992A - Chusetts - Google Patents

Description

W. ARTER.

GRINDING AND SIMILAR MACH|NE- APPLICATION FILED JUNE 14. 19:1.

2 SHEETS-SHEET l.

Patented Dec. 16, 1919.

W. ARTER.

GRINDING AND SIMILAR MACHINE.

APPLICATION FILED JUNE :4, 19:1.

Patented Dec. 16,1919.

2 SHEETS-SHEET 2 UNITED STATES PATENT OFFICE.

WILLIAM ARTER, 0F WORCESTER MASSACHUSETTS, ASSIGNOBTO THE PERSONS-ARTER MACHINE COMI'ANY, 0F WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- GHUSETTS.

GRINDING- AN D SIMILAR MACHINE.

Patented Dec. 16, 19.19.

Application filed June 14, 1917. Serial No. 174,795.

To all whom it may concern:

Be it known that I, WILLIAM.ARTER, a subject of the King of Great Britain, r esiding at 540 Salisbury. street, Worcester,-1n

the county of Worcester and State of Massa-- chusetts, have invented certain Improvements in Grinding and Similar Machines, of which the following description, in con nection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to grinding machines and' similar machine tools, and has for its chief object to devise means for relieving thev operator of certain duties now required of him, to increase the production of machines of this ty more automatic in their action. These, and

other objects of the invention, and the means Fig. 1;

{Fig 3 is a view similar to Fig. 1 of a modified construction;

Fig. .4 is a front elevation showing, on a somewhat larger scale than Fig. 3, certain details of construction of the chuck elevating mechanism of this machine; and

5 is aleft side elevation of the parts shown in Fig. 4, certain of the parts being shown in cross section for the purpose of illustrating more clearly the details of construction:

The machine shown in Figs. 1 and 2 comprises a work supporting chuck '2, and a grinding wheel 4, which is mounted on a horizontal shaft supported in' bearings car ried' by a table or carrier '6 that recipro- 'cates on suitable ways formed on a machine frame or bed 7. This reciprocating movement carries the wheel 4 or other tool back and forth across the work supporting chuck 2 and the wheel of. course rotated rapidlyand to render them while this movement is taking place. The

carrier 6 is given its reciprocating movement by means that include a reversing mechanism, which is inclosed in a casing 8, and to which power is applied by a belt running on any one of a series of pulleys- 9. This reversing mechanism ma be of any suitable type, but preferably is either of the construction shown in a co-pending application Serial No. 96,101 filed by me May 8, 1916, or like that shown in Patent No. 1,184,905, granted May 30, 1916, both said application and patent being assigned to the assignee of the present invention. This reversing mechanism includes a reversing lever 10 and a pair of dogs 12, the

construction of which is clearly shown and described in the White application, above designated, and which are adjustable into any position on a rack 14 that is bolted to the side of the carrier 6. These dogs through engagement with a pin 11 projecting from the lever 10, operate the lever which, in turn, operates through the reversing mechanism to reci rocate the carrier 6 on its ways.

This genera organization is similar to that which has long been employed in machines of this type and will be readily understood by thoseskilled in this art.

The chuck 2 is supported by a bracket 15, which is mounted ona slide 16 that may be raised or lowered to adjust the chuck properly with reference to the grinding wheel 4. This slide moves on vertical ways formed on the front of the frame 7, and for the purpose of raisin or lowering it, it-carries a vertical shaft 1 the lower end of which is threaded into a post 18 that rests on the base ofthe 'machine. This screw threaded shaft 17 is freely rotatable in the slide 16, but cannot move vertically with reference to the slide. Consequently, when this shaft is rotated it will be' threaded into or out of the post 18, depending on its di-. rection of rotation, and will move the slide 16 up or 'down. For the purpose of rotating the shaft 17 in this manner, a beveled .gear

20 is mounted fast on the upper end of the shaft and meshes with a b'eveledpinion 21 secured fast -on a horiiontal shaft 22 that rotates in a bearing busliin or bracket 24, which is carried by the slide 16. A hand wheel'25 mounted fas't-on the end of the shaft '22 provides a convenient mean for behind the hand turning this shaft and thus rotating the screwthreaded shaft/17. I

The present invention provides-automatic means for operatingthis screw elevating or feeding mechanism for the chuck. This au tomatic means comprises a toothed ratchet wheel 26 mounted fastonthe shaft 22 just lever 27 mounted to oscillate on the bushing 24'and carrying a gravity pawl 28 that engages the, teeth of. the'ratchetwheel 26. An ad ustable link 30 connects one arm of the bell crank lever 27 with an arm of a similar lever 31 which is fulcrumed at 32. Two

smaller bell crank levers 32 and 33 are fulcrumed adjacent to the" member 31 and have arms that extend horizontally toward each other, as clearly shown in Fig. 1. The ends of these arms overlap each other and each has a horizontal slot formed in it through which extends a pin 34 that is secured fast in one arm of the bell crank lever 31. These three levers 31, 32 and 33 are so located, as

will be clear from an inspection of Fig. 1, that when the vertical arms of the levers- 32 and 33- are swung away from each other, they will lift the pin 34 and consequently will swing the bell crank lever 31 in a counter-clockwise direction. This movement w1ll be transmitted through the link 30 to the bell crank lever 27, and will swing the pawl 28 forward,- thus causing it to turn the ratchet wheel 26 in a clockwise direction as this wheel appears in Fig. 1. This movement of the bell crank levers 32 and 33 is produced by a short lever 36 fulcrumed at 37 and connected by a link 38 with the lever.

10 of the reversing mechanism. Each of the levers 32 and 33 carries in'its vertical arm an adjustable screw which points toward the lower .end of the lever 36, and is engaged by this part-of the lever when it is swung about its fulcrum 37'.

As the carrier 6 travels back and forth to give the wheel 4 its operative stroke, the

dogs 12 act. at the ends of the stroke of the carrier to swing the lever 10 first to the right a and then to the left, thus reversing the movement of the carrier at a po nt 1n each stroke determinedby the location of the.

" dogs. This movement of the lever 10 is transmitted through the link 38 to the lever 36 and causes this lever to swing one or the other of the levers 32 or 33, depending on the direction in which it is moved by the link 38, and this movement of either of the bell crank. levers 32 and 33 acts in the manner just described to transmit a feeding movement to the ratchet wheel 26 and consequentl of the c wk 2. A spring 40 connected at one end to the swinging lever 31 and at its opposite end to the machine frame, tends to hold this lever against an adjustable stop screw 41, and this spring returns the lever wheel 25, and a bell crank to effect anelevating movement of this return movement may be adjusted,.

and consequently the throw, 'or extent of the feeding movement of the pawl 28, can be adjusted. This adjustment can also be effected by varying the distance that the stop screws carried by the levers 32 and 33' pr 0- ject toward the lever 36. In this connection it will, of course, be understood that the throw of the lever 36 is substantially constant.

The front face of theratchet wheel 26 is graduated, as shown in Fig. 1, and a pointer 44 (see Fig. 2) mounted fast on the stationary bushing 24 coiiperates with these graduations to indicate the extent of the feeding or elevating movement of the chuck.

It is sometimes convenient to be able to setthe chuck elevating mechanism to feed automatically a certain distance, say, for instance, fifteen thousandths of an inch and then stop automatically. For this purpose a throw-out-finger 45 (see'Fig. 2) is mounted frictionall on the shaft 22 just behind the ratchet wheel 26 so that this finger will rotate With the shaft 22, but can be rotated relatively to the shaft by hand for the purpose of setting it. v If this finger is set back to the left (as seen in Fig. 1) a certain distance, say fifteen thousandths of an inch, as shown by the graduations on the ratchet wheel 26,'and the feeding mechanism is then started, it will automatically elevate the chuck 2 step b step, the desired distance; at which time t e finger 45 will be brought under the pawl 28 and lift it off the wheel 26 and keep it from engaging the teeth of the ratchet wheel while it is at the backward part of its stroke. Any further feeding movement of the wheel thus is prevented. i

The pawl, of course, will continueto oscillate,'but will merely ride back and forth on the finger 45 and out of contact with the teeth of the wheel 26.

It will be evident that by arrangin this mechanism so that it is operated by t e reversmg mechanism, any necessity for an in dependent set of reversing dogs is avoided, and also that the feeding movement of the chuck is effected substantially at the end of the stroke of the grinding wheel 4. Usually the movement of the carrier is so adjusted that the wheel will clear the work at each end of its stroke and it is, of course, desirable to effect the feeding movement of the chuck at this time. The feeding mechanism above described obviously meets this requirement. 'It will readily be appreciated also that the same feeding movement is effected on either stroke, although if it is desired to have the chuck elevated at the end of one'stroke and not at theend of the other, it is merely necessary to back out the set screw in. the lever 32 or 33 which itis desired to render inoperative. Furthermore, smce the carrier 6 is power driven, and slnce the The shaft 50 carries a beveled gear 51,

which is driven by anotherbeveled gear 52 to which power is applied in any convenient manner. The gear 51 normally rotates freely on the shaft 50, but is thrown into or out of driving engagement with the shaft by means of a clutch sleeve 53, which is keyed to the shaft so that it can slide upor down toward or from the gear 51, to render t e gear inoperativeor operative to drive the shaft 50. This movement isimparted to the-sleeve 53 by a hand lever 54 which carries a pair of studs or-rolls that run in the groove of the sleeve 53. -This mechanism is substantially like that shown in my application abqve referred tofor throwing thepower on or off the carrier 6.

The present invention provides an auto matic means for operating the clutch that controls the driving mechanism for the chuck shaft. For this purpose the lever 54 has a depending arm 55 formed on it. This arm is connected b an adjustable link '56 with a bell crank ever 57, which is connected b another .link 58 with a bell crank lever 59 aving an arm 1 ing in the path of movement of a do 360. This dog is ike the dogs 12, and is a justably mounted on the rack 14 in the same we that the dogs 12 are mounted. According y, when this dog strikes the bell crank lever 59, as thecarrier 6-moves toward the right, it will operate through the connections just described to swing the lever 54 about its fulcrum in a counter-clockwise direction, and thusrmove the clutch sleeve 53 into its raised or inopera tive position. This, of course, stops the'rotation of the chuck; but in order to start the chuck again it is merely necessary for the workman to lift the lever 54 andthrow in the clutch. J y 7 This mechanlsm is very convenient in grinding some kinds of parts in which it is desired to have the wheel 4 make only a single reciprocation or a single stroke across the work. The workman stands in front of the chuck 2 and as the wheel 4 moves back to the right, Fig. 1, out .of engagement with the work. the dog 60 stops the rotation of the chuck automatically as the grindingwheel 4 nears the rearward llmit of its stroke. The workman then removes from the chuck the piece of work last ground 'on the upper ed 0 the bar and I vided with a nut h y m and replaces it by another piece. This operation takes but an instant. The work-man then lifts the lever 54, thus throwingthe clutch 53 in again, and starts the chuck to rotating before the wheel 4 comes into contact withvthe-work. The automatic movement of the clutch is effected in'timed relationshi the tool 4; and the workman thus is relieved of the duty of stopping the chuck at a time when his entire attention is needed in handling the work.- It is obvious, of course, that this clutch might bethrown in again by a spring or by a dog as the table advances, but for most conditions this additional control of the chuck is not necessary.

A modified form .ofautomatm chuck ole-- vating mechanism is shown in Figs. 3, 4 and 5, and inasmuch as many of the parts of this mechanism are substantially the same as those shown in Figs. 1 and 2 the same reference numerals 'are applied to them in these 1 figures that are used to designate them in the views above described. In this arrangement :1 back gearing is interposed between the shaft 22 and the ratchet wheel 26. As

clearly shown in- Fig. 5 the ratchet wheel. 26'

is keyed on the hub of a pinion 61 that rotates freelyon a bushing 62 which is supported on the shaft 22. This pinion 61 meshes with a gear 63. that is mounted to rotate freely on a stub shaftsupported by the' machine frame. A second pinion 64 rotates with the gear 63 and meshes with a gear 65 that is keyed to the shaft 22. In other words, this mechanism constitutes a reduction gearing through which the movements of the ratchet wheel 26 are transmitted to the shaft 22. v a

The thrown-out finger 45 is mounted on to the reciprocating movement of the hub of the ratchet wheel'26, as in the construction previously described. This modified construction also includes a avity pawl 66 pivoted to the upper end 0 a stationaryarm 67 that is supported on the bearing 68 for. the shaft 22. This pawl pre: vents any back lash of the-ratchet wheel. The pointer 44 also is secured to the upper end of the stationary arm 67.

The operating mechanism for the ratchet wheel 26 comprises a horizontal bar .70

mounted to slide through suitable bearing pieces 71 that are bolted to the frame 7.

This bar is slottedto receive two adjustable stops or dogs 72. Each of these steps consists of a bolt head, toothed on its under side to engage corres ending teeth formed rocans of which the olt teeth areheld securely in mesh with the bar teeth. This bar slides just back of the handle 10' and the stops 72 project high enough to engage the pin 11 on the handle 10 and to be en ged by the adjustable members a of the. ogs 12. Consequently, when these ducing a reversal of the movement of. 'the 7 table 6.

The movement of the bar 70 produced in this manner is transmitted to the ratchet wheel 26 through mechanism that includes two bell crank levers 74 and 75, connected by a pin 7 6 carried by one lever and work.- ing in a slot formed in the other lever, these, levers being provided with upstanding arms arranged to engage opposite sides of a pin 77 fixed in the bar 70. A spring 78 holds the upright arms of the levers 74 and 7 5 in engagement with the in 77.

It will now be evi ent that if the movementof the bar 70 produced in the manner above described is toward the left, Fig.- 3, this movement will be transmitted through the pin 77, lever 7 k and link 30 -to the bell crank lever 27, thus oscillating this lever and operating through the pawl 28 to move the ratchet wheel 26 forward and thus to elevate the chuck. If the movement of the bar 70 is in the reverse direction, that is, toward the right, then this movement will be transmitted through the in 77, bell crank lever 7 5 and 'pin 76 to t e other bell crank lever 74 and thence, asbefore, to the pawl 28 and the ratchet wheel 26. The extent of these movements obviously will depend on the adjustment of the stops 72 on the bar 70. a

This mechanism has some advantages over that shown in F igs. 1 and 2 since the presence of the back gearing reduces the strain on the arts through which the motion of the tab e 6 is transmitted to the ratchet wheel 26 and it also provides for a finer adjustment of the chuck elevating movement. There is. also less danger of back lash in this construction than in that previously described.- It is obvious that when ever it.is desired to discontinue the/use of the automatic chuck elevating mechanism it is merely necessary for the workman to ad- 'just the parts a of the dogs 12 into'a position high enough to cause thenrto clear the tops of the stops 72. If it is desired to have the chuck elevating movement occur at the" end of one stroke only of the table 6, then the pro er dog 12 is adjusted to render it inca able of engaging its corresponding stop 72. referably the dogs used are constructed as shown and described in the patent above designated so that this -ad usting movement may be convenientlymade.

While convenient embodiments of the invention have been herein shown and 'described it is obvious that the invention is not limited 'to the specific embodiments disclosed but that many changes in details of construction and in arrangement of the parts maybe made within the skill of the mechanic and the discretion of thedesigner while still retaining the essential characteristics of the invention.

What is claimed as new is:

1. In a machine of the character described, the combination with a work support, a tool, and a carrier for one of said devices mounted to reciprocate to transfer the point of operation of the tool over the work, of mechanism arranged to be 0 rated by the carrier to effect a relative ceding movement of said tool and work support, said mechanismcomprising a ratchet ,a pawl and lever connections through which the motion of the carrier in either direction may be transmitted to the pawl to operate said ratchet.

' 2. In a machine ofthe character described, the combination with a work support, a tool and a carrier for one of said devices mounted to reciprocate to transfer the point of operation of the tool over the work, of mechanism arranged to be operated by the carrier to effect a relative feeding movement of said tool and work support, said mechanism comprising a pawl and ratchet and adjustable 'meaiis for automatically throwing the pawl out of operative relationship to the ratchet when a feedin movement of substantially predetermine extent has been effected. v

3. In a machine of the character described, the combination with a work support, a tool and a carrier for said tool mounted to reciprocate in substantially a horizontal plane to c'arry-the tool back and forth across said ,su port, of adjustable reversing dogs on sai carrier, and elevating mechanism for said support constructed and arranged to be operated b said dogs.

4. In a machine of the character described, the combination with a worksup- -port mounted to be raised, and lowered,

a tool and a carrier for said tool mounted to reciprocate in substantially a horizontal plane to carry the tool back and forth across said support, of .a screw elevatin v mechanism for said support, pawl an ratchet means for .operatin said mechanism, adjustable dogs on sai carrier, and means operated by sai'd'do for operating said pawl and ratchet miec nism.

5. In a machine of the character described, the combination with a work support mounted to be raised and lowered, a tool, and a carrier for said tool mounted to reciprocate in substantially a horizontal plane to carry the tool back and forth across said support, of a screw elevatin mechanism for. said support, pawl an ratchet means for operating said mechamama's nism, a swinging memberconnected with said awl and ratchet mechanism to o erate' 1t, a pair of levers connected with said" member, a pair of dogs adjustably mounted on said carrier, and a device arranged to be operated by said dogs and operative to rock said levers.

6. In a machine of the character described, the combination with a work support and a tool mounted for reciprocating 7, when it has given said supporta prede termined elevating movement.

-7. In a 'machine of the character. described, the combination with a work supporting chuck, a tool,- and a carrier for said tool mounted for reciprocating movement to carry the tool back. and forth across said. chuck, of means for rotating said chuck, and connections whereby said means is controlled by said carrier. a

8. In a machine of the character described, the combination .with a work supporting chuck, a tool, and a carrier for said tool mounted for reciprocating movement to carry the tool back and forth across said chuck, of means for rotating said chuck, said means including a clutch, and controlling mechanism for saidclutch arranged to be ogierated by said carrier.

scribed, the combination with a work supporting chuck, a tool, and a carrier for said tool mounted for reciprocating movement to carry the tool back and forth across said chuck, of means forrotating said chuck, said means includin a clutch, a dog adjusta'bly mounted on sai carrier, and mechanism arranged to be operated by said dogto throw out said clutch.

10. In a machine of the character described, the combination with a work sup porting chuck, a tool, and'a carrier for sald tool mounted for reciprocati movement to carry the tool back and fort across said chuck, of means for rotating said chuck, and mechanism for controlling said means automatically in timed relationship to the movement of said carrier.

.of said support, 0

feeding movement of a machine of the character de mechanism for said supporti 11. In a machine of the character de scribed, the combination with a work support mountedvto be raised and lowered, a tool, and a carrier for said tool mounted for movement to carrfv the tool over the face an elevating mechanism for said support, a reduction aring arranged to operate saidmechamsm, and a .stepby step actuating mechanismfor said earmg arranged to receive its motion from t e movement of said carrier.

12. In a machine of the character described, the combination with a work support mounted to be raised and lowered, a tool, and a carrier for said tool mounted for movement to carry the tool over the face of said support, of an elevating mechanism for said support, and a stepby step operating "mech nism therefor constructed and arranged to transmit motion from;said carrier to sald elevatin mechanism mcluding a pair of connec bell crank levers through which the motion of the carrier is transmltted.

13. In a machine of the character described, the combination with a work support, a tool, and a carrier for one of said devices mounted to reciprocate to transfer the oint of operation of the'tool over the wor of mechanism arranged to be operated by the carrier when it arrives substantially at the end of its stroke to effect a relative said tool and 2 work support.

14. In a machine of the character described, the combination of a work support mounted to be raised and lowered, a tool, a carrier for said tool mounted for reciprocating movement relatively to said work support to transfer the point of operation of the tool over' the work, a screw elevating pawl and ratchet means for operating sai a air of hell crank levers. connected toget er to cause the movement-of one lever about its fulcrum to movethe other lever in the opposite direction, means operating in unison with said carrier for moving said levers, and connections through which the movement of said levers operates said pawl and ratchet mechanism;

In testimony whereof I "have signed my name to this specification.

WILLIAM ARTER.

mechanism,

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