US2008137A - Sizing device for grinding machines - Google Patents

Description

July 16, 1935. o. GURNEY I SIZING DEVICE FOR GRINDING MACHINES.

Filed Oct. 29, 1931 4 Sheets-Sheet l INVENTOR July 16, 1935. D. GURNEY SIZING DEVI GE FOR GRINDING MACHINES Filed Oct. 29, 1931 4 Sheets-Sheet 2 D. GURNEY July 16, 1935.

SIZING DEVICE FOR GRINDING MACHINES Filed Oct. 29, 1931 4 Shets-Sheet s INVENTOR .@an/e/ fiam ef NEY July 16, 1935. o. GURNEY SIZING DEVICE FOEGRINDING MACHINES Filed Oct. 29, 1931 4 Sheets-Sheet 4 lllHlllHlii INVENTOR w n A M WM Patented July 16, 1935 ,UNITED STAT S SIZING DEVICE Daniel Gurney, Waynesboro, Pa., assignor to Landis Tool Company, Waynesboro, Pm, a corporation of Pennsylvania i Application October 29, 1931, Serial No. 571,892

- '1 Claims. (01. 51-1s5i Sizing devices as heretofore constructed gage the work by coming in contact with the work itself, suitable mechanism being provided to stop the feed of the grinding wheel when the'work is 5 reduced approximately to finished size, and-then operatingto withdraw the grinding wheel and operate other 'mechanism when the work is ground to its finished size and polished. This invention provides a sizing device having means engageable with the grinding wheel itself for controlling thesize of the work sothat when the grinding wheel reaches a certain predetermined position in its movement toward the workit is engaged by suitable fingers which are moved to set in operation mechanism for stopping further feeding of the grinding wheel toward the work and for slowing down either rotation or 'oscilla tion of the work or operating any other desired mechanism and further feeler fingers are provided engageable with the grinding wheel when the work has been ground to finished size for stopping operation of the rotating or oscillating mechanism for the work and for withdrawing the grinding wheel out of. engagement with the work. By the use of the present device a higher degree of accuracy of work is insured in that wear on the grinding wheel will make no appreciable difference on the size of the work.

Among other objects of the invention are to,

Figure 3,' an enlarged end elevation showing one of the adjustablefeeler fingers,

Figure 4, an enlarged end elevation with the housing removed to show some of the inner oper ating mechanism, v

Figure 5, an end elevation of a feeler finger looking in the direction of the arrow in Figure 3,

Figurefi, a plan view with the, top coverjremoved,

Figure 7, a plan view of the contact arm, and

Figure 8, a diagrammatic showing of the wiring. a

Figure 9-is a planview of a grinding machine showing the sizing device mounted thereon.

In the drawings numeral I indicates a housing in which are mounted shafts I I and I2 which carry latches I3and l4. To the outer ends of the shafts H' and Here attached fingers l5 and ii in the ends of which are held diamonds l1, adapted to engage the periphery of the grinding wheel It. The fingers I5 and 16 are preferably made of some very light material such as aluminum. The finger I8 is securely clamped to the end of the shaft II. The finger I5 is secured to and adjustable on a block lily Clamps 20 are secured to finger 15 by screws 2|, the free ends 'of. the clamps being secured against the sides of the block I! by screws 22, as shown in Figure 5. A screw 23 is secured in finger IS. The head of this screw is drilled and tapped to receive an adjusting screw 24. The block I9 is secured to the shaft H by means of a screw 9, the finger l5 being slotted where the shaft l I passes through it to permit the necessary adiustment of the finger on-the block ill. ,The latches l3 and 14 are biased counterclockwise by springs 25. Arms 26 and '21 are mounted rotatably on a shaft 28 to the outer end of which shaft is attached a lever 29. The shaft 28 has'a crank 30 attachedto it, which crank has a pin 3| extending through its outer end which pin is adapted to engage the upper sides of the arms 26 and. 21, to move them against the tension of springs 31 and 38. A spring 8 on shaft 28 and attached to lever 29 tends to hold lever 29 in elevated position. During a grinding operation the ends of the arms 26 and 21 rest beneath the lower -ends of the latches l3 and l4. ,The arms are in position to engage just a narrow edge on the lower arms of the latches so that a slight rotation of the latch in a clockwise direction will permit the'end of the arm 26 and 21 carry insulating blocks 34 and 35 which a are secured to thejarmsrby means :of screws 36. The armsjf'are'jbiased-1, I ykmeans of springsfl and 38-.- C'ont 'springs-. 9;" have bentlends which carrylcontact points 4| and 42 which are adapted itoibe brought into contact with points;44 and 43,;on sp1jingfarms 46 and 45.

Contact points flami; 4.-sre;in theme with a battery llthroii n solenoids or'other electric responsive devices ill and 5|. These solenoids may control any suitable mechanism on the grinding machine such for example as means for stopping feeding of the grinding wheel toward the work and for slowing down oscillation of the work or rotation of the work or any other mechanism, the speed of which should be changed when the work has been reduced substantially to its finished size. Contacts-42 and 43 are in circuit with the battery 41 through solenoids 48 and 49. Contacts 42 and 43 are brought together when the work has been ground to its finished size. Solenoids 48 and 49 therefore may control means for withdrawing the grinding wheel from the work and for stopping operation ofsuch mechanism as should be stopped when the'work has been ground to finished size. The base In of the sizing device is mounted upon a slide 52 which is adjustable toward and from the work by means of screw 53 which is threaded through a bracket 54 on base Ill. The slide 52 moreover is pivoted at 55 to a block 56 which in turn is mounted for further adjustment on a bridge 51. The bridge is secured to a carriage 59 by. T-bolts 58 and is.

adjustable axially of the work. v

The sizing device may-be mounted upon any suitable grindingflmachine such, for example, as that shown in Figure 9. The particular type of grinding machine here shown is an internal grinding machine having a base 60 with a suitable work support 6| .mounted thereon. The work support carries a work holding device 62 showing'work 53 supported therein. The work is rotated by a suitable motor 54. A wheel support 65 has a wheel spindle 66 carrying a grinding wheel IS. The wheel spindle is driven by a motor 61. Cross feed mechanism 68 of conventional and well known construction is provided. This cross feed may be manually operated by hand wheel 69 or automatically effected by precision mechanism 10.

In operation the feeler fingers are in a position, so that the diamond lies exactly on a center line joining the axis of the wheel and the pivots of the fingers. As the grinding wheel moves into the work its periphery contacts with the diamond in the feeler fingers. As soon as the diamondin feeler finger I is touched by the grinding wheel the finger will be rocked on its pivot. This rocks the latch l3 clockwise permitting the end of the feeding of the grinding wheel toward the work and to operate any other mechanism which it may be desirable to control at this stage of the grinding. The grinding wheel continues to polish I the work until the diamond in finger l6 contacts with the work. When this occurs this finger is lifted to rotate shaft l2 in a clockwise direction to permit arm 21 to slip off the end of thelatch l4 so that this arm will rotate the latch in a clockwise direction to lift feeler finger 16 away from the wheel. When arm 21 reaches its uppermost position'insulating block 3.5 lifting arm 40 willbring together contacts 42 and 43. This will stop further feeding of the grinding Wheel and will set in operation or stop operation of such mechanism as should be operated or stopped from -operation when the work has been reduced to its finished and polished form. From the foregoing description it will be apparent that at all times i gage the position of the grinding wheel-in its .throughout. My device gages the position of the periphery of the grinding wheel so that any slight irregularities in the work will not influence the gage or sizing device. I

It will be obvious to those skilled in the art that various changes may be made in my device with out departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification, but only as indicated by the appended claims.

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

l. A sizing device for grinding machines comprising a plurality of fingers having hardened points adapted to engage the periphery'of a grinding wheel when the work has been reduced to a predetermined size, a plurality of solenoids in control of the operative mechanism of the machine, switches in said control line, and means operable by engagement of the fingers with the grinding wheel for first throwing the fingers free of the grindingwheel and thereafter instantly closing the said switches to operate the said sole noids substantially as set forth.

2. In a grinding machine having. a plurality of solenoids in control of all operative mechanism on the machine, a plurality of switches in control of circuits for energizing the solenoids, a pair of fingers positioned with their ends arfiacent to but normally out of contact with the periphery of the grinding wheel, said fingers being biased in a direction to close the said switches, a latch for holding each of said fingers in position to maintain the switches in open condition, engage- 'ment of the periphery of the grinding wheel first 'with one of said fingers and then with another causing said' latches to release mechanism for closing said switches to energize the said solenoids, substantially as set forth.

3. In a grinding machine having a plurality of solenoids in control of mechanism for operating the various elements of the grinding ma-' chine, a pair" of shafts each having a finger mounted thereon, the finger extending toward the periphery'of the grinding wheel, a latch on said shaft said latch being engageable by an arm for holding the finger extended towardthe grinding wheel, a pair of switches in control of circontact of another finger with the grinding wheel causing cessation of other operations, substantially as set forth.

4. In a grinding machine having a plurality of solenoids in control of mechanism for operating the various elements of the grinding machine,

a pair of shafts each having a finger mounted thereon, the finger extending towardthe periphery of the grinding wheel, a latch on said shaft an arm engageable with said latch for holding the finger extended toward the grinding wheel,

grinding wheel when the 1atch,,is released from the said arm, substantially as set forth.

5. In a device of the kind described a grinding wheel, a feeler adapted to engage said grinding wheel at a predetermined point in a grinding operation, electrical contacts adapted to be actuated by said feeler" and means responsive to the rotary movement of said wheel to actuate said feeler, and means operable upon the actuation of saidieeler-for removing it out of engagement with the wheel.

3. In a device of the kind described a wheel support, a grinding wheel mounted thereon,

means to r'otate'said wheel, a work support,

means to effect arelative feeding movement be-v tween said supports, a feeler adapted to engage said wheel at a predetermined point: in said grinding operation and means to separate said feelenandsaid wheel immediately after said engagement. H

'1. In a device of the kind described a wheeli support, a grinding wheel rotatably mounted therein, means to rotate said wheel, means to move said wheel support, feelers in the path-of the said wheel and adapted to engage said wheel at a predetermined point in a grinding operation, an electric circuit, contacts on said feelers for opening and closing said circuit and means to gagement contacts.

DANIEL GURNEY.

throw said feelers clear of the wheel upon entherewith and therebyto' close'said 20

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