US1790245A - Grinding machine - Google Patents

Description

Jan, 27, 193.1. c. H. NORTON 1,790,245-

GRINDING MACHINE Filed June 15, 1927 2 sheets-sheet 1 .Charles H. .Norton .Hdfdmwm I @gwn @um mq Jan. 27, 1931. c. H. NoRToN 1,790,245

GRINDING MACHINE i Filed June 13, 192? 2 Sheets-Sheet 2 fig a i Snom/Hoz Charles H. Norton @www Patented Jan. 27, 1931 -u-Nrrs`- rA'rs .PATENT Orefice CHARLES H. NORTON, OF PLAINVILLE, CONNECTICUT, ASSIGNOB. TO NORTON COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS GRINDING MACHINE Application led June 13,

My invention relates to grinding machines and more particularlyto a grinding machine having a mechanism for truing the face of the grindingr Wheel.

5 `Phe standard type of truing appara-tus for a grinding Wheel comprises a diamond or truing tool mounted on,y the Work sul'iporting table which is reciprocated past the wheel. Such a. truing apparatus does not cooperate 0 with the Wheel feeding mechanism, and ithas consequently been necessary after each truing operation to ,readjust the stopping device on the Wheel feed mechanism by a cut and try method to compensate for the reduction in 5 size of the grinding wheel and to 'get the proper Work size.. To reciprocate the Work table manually, for passing the truing-'tool across the face of the grinding Wheel, involves various difficulties and particularly 0 thatof obtaining a uniform slow motion tool feed which has been found highly desirable for producing the proper surface 'on the Wheel. y Y

Inthe truing mechanisms heretofore pro- 5 vided, there has been no provision for adjusting the position of the diamond finely with reference to the face of the grinding Wheel or to the surface of the work, and it is not possible with such devices to set the diamond in correct position so that when the truing has been accomplished thewheel face is located exactly Where the true line of contact of the Wheel with a. finished piece of work would be. Yet by locating the point of the diamond in that lme of contact-,itis possible to grind Work to size after the Wheel has been trued Without resetting the micrometer stopping mechanism on the wheel feed.

'.lhetruing device lis usually mounted on the. hand operated work traversing table, and it is necessary for the operator to 'use considerable skill to move the table at the right speed and with uniformity of motion when 5o fore desirable that a mechanism be provided he traverses the diamond across the face of the grinding Wheel.. For example, if they 1927. Serial No. 198,325.

` Which-causes the diamond to be traversed at to overcome such difficulties, and to provide a grinding machine of such a construction that work may be ground repeatedly to a'given si'ze as determined by a micrometer Wheel feed stopping mechanism and the grinding wheel may betrued as desired Withoutrequiring resetting of the stopping mechanism after such truing operation has been accomplished.

It is a further object to provide a simple type of truinc device which is permanently mounted on the machine and which may be quickly moved into and out of operative relation with the grinding Wheel,l and thereby reduce the lost non-productive time involved in operating such a machine.

It is a further object to provide a truing device which. maybe operated by a power :drivenj mechanism at a desired and uniform rate of feed across the Wheel face.

Further objects are to-provide a` grinding machine with a truing device Which may be finely adjusted to a 'desired yposition for truing the Wheel, and which maybe moved at the will ofthe operator to a non-operative posit-ionA and then subsequent-ly returned always to the vsame position lso that the wheel face may be trued on a line coinciding with the line of contact of the Wheel andthe Work.

With these and other objects in View as Will be apparent to one Skilled in the art, my invention resides in the combination of parts set forth in thev specification and covered by the claims appended hereto.

y'invention relates primarily to a grinding machine which has a. rcciprocable Work support, a grinding wheel movable towards and from tl'ieivork for grinding the same and a wheel feeding mechanism mcluding a `stopping device and a micrometer adjustment so arrangedA that thewheel face may be stopped in .its forwardfeed in al desired position to grind the Work to apredetermilled and duplicatable size. This machine is provided with a truing mechanism which is preferably so located that it will true the wheel on the line of Contact between the 30,1923.- 60 The grinding Wheel \slide" 12 maybe fed Wheel face and the surface of the'nislied piece of work. The truing tool is' held in a fixed. position so that the wheel may be fed into the diamond, and when its face has been trued the operative face of the wheel will remain in the same position as before and exactlywhere the surface of the finished vpiece of work will contact with it. This makes it unnecessary to-reset the wheel feed stop after truing the wheel, since the act of resetting the stop during Ithe operation of tf'ruing automatically serves this purpose. A suitable support is provided-for the diamond so that it may be readily moved to aninoperative position and then` returned to exactly the same position as before. Thetruing device also coni/prises mechanism for finely adjusting the positionof the diamond to make up for its wear or 'to position a new tool as desiredV at the correct point for truing, and

this -mechanism involves means whic i a're preferably; power operated to traverse the diamond across the face of the wheel. I

Referringto the drawings which illustrate mi one Aembodiment ofmy invention, and in which like -reference numerals indicate like parts: y I Figure 1 is an. end elevation of a grinding machine illustrating my truing device having 3 parts broken away to more clearly illustrate the construction; y

Fig. 2 is an enlarged fragmentary view of the rear ortion of the machine showing the wheel sli( e and the truing mechanism having parts broken awayand shown in section to v .more clearly show the construction;

Fig. 3 is an enlarged fragmentary view showing the construction of the diamond mounting;

Fig. 4 is a similar enlar ed View ,of the arm supporting the diainon showing means for clamping 'the diamondin adjusted'position; l Fig. 5 is a side elevation showing a simple form of Wheel feed mechanism; Fig. 6 is a front-elevation of the saine; and Fig. 7 is a fragmentary perspective view onini enlarged scale ofthe adjusting device for varying the path of travel of the diamond. In the specific embodiment of my invention '5U selec d for illustration, I have shown ,a

f grinding machine having a base 1l, supporting a wheel slide 12theieou-and adapted 'to slide on suitable slideways` The grinding i ywheel `13 is rotatably mounted on the slide and is driven `by a belt 14 from a pulley,

15 mounted on a shaft16 within the rear base of the machine. A pulley 18 is mounted on the outer end of' shaft 16 and-is driven by a belt 19 from a motor 2O mounted on the 0 rear base of the grinding machine@ For a furtherillustration and detailed description jof this mechanism,reference may be had fto my prior Patent' No. 1,443,924 of' January toward the work or dressing -tool by means of a feeding mechanism, which may be of any old and well known construction such as thatshown in detail in the priorpatent to Wilcox No. 1,261,083. The simplified form of mechanism illustrated 'comprises a manually operable member 22 having micrometer connections 23 between 4it and the gear wheel l stop member 26 which may be swung toward the gear wheel 24 and into the path of the abutment 27 on the member 22 to limit the movement of the grinding wheel when moved in a direction toward the work or truiiig tool.

To attain one of the objects of my invention, I may mount the truing tool in any suitable manner so that it will bezin a fixed position relative to the grindinor wheel and so that the grinding wheel mayie given a. feeding movement toward and from the truing tool. 1n my preferred construction, I -do mount the diamond that it may be moved into and out of anoperative position, and while the diamond may be mounted on the slidable tab-le or other part of the machine which is fixed relative to the line of grinding I have shown it as mounted on the wheel guard vand the latter as held on a pivotally mounted support 35 .which swings from a cylindrical portion 36 rotatably mounted inthe sleeve 37 which yis secured to the upper portion of the wheel guard 30. The member 35 is provided with an enlarged portion 40 at its lower endhaving a cylindrical hole 41 adapted to f portion 45 which engages a correspondingly threaded-opening 46 within thcl portion 4() so that the diamond may be finely adj usted in position relative to the arin 35. The holder -42 is provided with an enlarged head 50 having graduations on its periphery and a zero Nniark or indicator point 51 is provided on the arm 35',`- so that the operator may turn the screw the desired amount followingthe graduations. This adjustment is provided soithatthe diamond may be adjusted as it wears away or so that a new diamond may be Ycorrectly positioned. as required to positionL it ,for truig thewheel.

To providea positioning-adjustment for setting up the truing tool for various sizes of work, I provide the member with a proj ecting arm 55. The arm has a hardened steel guiding shoe 57 adapted to contact with a pin.

58 mounted in a fixed position relative to the wheel guard. The position of the shoe 57 may be adjusted relative to the arm 55 and, the member 35 by the adjusting screws 6() to vary the location of the member 35 so that the diamond 47 may be adjusted into position to coincide with the line of contact between the grinding wheel and the finished work.

I may reciprocate the diamond across the face of the wheel by suitable mechanism, and in my preferred construction I lutilize a motor driven mechanism comprising a motor mounted on the bracket 66 which in turn4 is secured to the upper surface of the wheel guard 30. The motor has an extending armature shaft 73 supported at its outer end in a bearing 67. This shaft carries a pair of p'ulleys 68 and 69 which are secured to the shaft by means of set screws. To move the cylindrical portion 36 within the cylinder 37 and reciprocate the diamond across the face of the wheel, I-provide a screw 70 mounted so that the threaded portion engages a correspondingly threaded aperture within the cylindrical member 36. As the screw 70.is turned the member 36 will be moved in a direction parallel with the axis of the rotating grinding wheel. The screw 70 is supported in bearings 71 and 7 2 and it is held against endwise movement by the collars 75 and 76 which are locked onto the cylindrical portion of the screw 7 0. Between the 'bearings 7l and 72. I mount the pulleys 77 and 7 8v loosely on the cylindrical portion of the screw 7 0 and they are positioned in alignment with the pulleys 68 and 69 respectively. The inner faces of the pulleys 77 and 78 are provided with clutch teeth adapted to be engaged by the clutch member 79 which is keyed by af key (not shown) to the cylindrical portion of the screw 70. A lever 80 is pivotally mounted to a boss 8l on the frame and has yoked member 82 engaging the clutch member 79. Bymanually moving the lever 80 the clutch member 79 may be brought into engagement to lock either the pulley 77 or pulley 78 to turn the screw 70. The pulleys 68 and 77 are connected by a straight belt 85 and pulleys 69 and 78 are connected by a cross belt 86 so that the screw maybe given a forward or a re- -a verse movement to traverse the dialnond across the face of the gril'lding wheel in either direction.

In the operation of my device, the operator when truing the grinding wheel swings the arm 35 downwardly so that the guide shoe 57 contacts with the pin 58 which limits the downward movement of arm 35. The member 35 is made sufficient in weight to insure the guide shoe 57 at all times contacting with the pins 58 and preventing vibration of the diamond during the truing operation. I The screws 60 and the diamond holder 50 are adjusted after the first piece of work has been ground so that the diamond, when in its opl erative position, contacts with the grinding wheel in a line coinciding with the point of Contact between'the grinding wheel and a finished piece of work. After this setting or adjustment has been made, it is only necessaryto make minor adjustments of the diamond to take care of its wear. When it is'desi-red to `true the wheel after the preliminary'adjustment has been made, the member 35 is swung downward-ly to bring the diamond 47 into its operative position relative to the wheel. This brings the diamond .automatically into the line of grinding. The feeding wheel is then turned manuallyto'bring the abutment 27 into contact' with the stopping member 26. Then the operator turns the micrometer adjusting mechanism tomake a minute adjustj ment of the 'abutment relative to the feeding wheel to permit feeding the lgrinding wheel a small fraction of an inch toward the diamond. The operator then moves the leve-r '8O thereby connecting the clutch member 79 to lock one of the driving pulleys 77 'or 78 to rotate the screw-70 and traverse the diamond in one direction across the face of the wheel. After the diamond has traversed across the face of the wheel in one direction, the operator throws the lever 80 into the opposite position to traverse thejdiamond across the face of the wheel in the opposite direction. This traversing of the diamond may be continued until the surface of the wheel has beenftruedf as desired.

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

l. A grinding machine comprising a base, a work support, a slide movable towards and from the support, a grinding wheel rotatably mounted on the slide, a microlneter cross feed mechanism including an adj ustable stop to feed and accurately position the wheel relative to a work piece, a diamond, precision' mechanism for accurately locatingl the dia'- mond in the l-ine of contact between the wheel and a finished piece vlof work, and means for reciprocating the diamond across the face of the wheel, whereby the wheel face may lbc trucd and maintained in ,the saine operative position relative to the work and resetting of the stop thereafter is not required for grinding duplicate pieces of work.

2. A ('.ylmdrlcal grinding lnachme comprising a rcciprocable work table, a slide lit) '.mounted to reciprocate the diamond and true the wheel, and precision mechanism tolocate the diamond accurately in the line of grindving contact between the wheel and a work ypiece on said table.

3.-.A cylindrical grinding machine comprising a reciprocable work table, a slide movable towards and from the table, a grind- Ing wheel thereon, a micrometer cross feed mechanism including an adjustable stop to feed and accurately position the wheel relai the diamond -in the line of contact between and a power traversing mechanism to move the wheel and a finished piece of work.

4. A grinding machine comprising a base, a reciprocable work table Ithereon, a slide movable towards and from the table, a grinding wheel rotatably mounted on the slide, a

micrometer cross feed mechanism including an adjustable stop to feed and accurately position the wheel relative to a work piece on the table, a diamond, a grinding wheel guard fixed on the base, a support for the diamond reciprocably mounted on the guard and arranged to traverse the diamond across the wheel face, and means permitting the diamond to be adjusted into contact with the wheel, whereby the wheel face m'ay be maintainedin the same operative position relative to the cross feed sto as it is tru'ed away. 5. A grinding mac ine 'comprising a grinding wheel, a work support, means to eed the grinding wheel'towards and fromthe work support, a truing tool,an adjustable support therefor so arranged that the tool may be moved out of operative relation with the grindingwheel or into a predetermined.- position in .the line of contact between the. grinding'wheel and the nisfhed work surface, and means for traversing said tool along said line of contact to true the wheel face. A Gy A grinding machine'comprising a base,

a s upportr'xed tor the b ase, a truing tool, a

swinging frame mounted on said' support to hold said tool so that itmay be swung into or out of operative relation with-the wheel, a line precision mechanism for adjusting the position ofthe tool relative to its support the tool laterally relative'tothe grinding wheel. f

7. A grmdmg machine comprlsmg a base,

-a work table reciprocably'mounted thereon,

a grinding wheel slide mounted to move to- `wards and from the work table, a grinding C5 -wheel rotatably mountedthe'reon, a diamond for truing the wheel, a reciprocable support for the diamond mounted on a stationary portion of the-base, and precisionmechanism for adjusting the diamond towards and from the 05 wheel.

8i A grinding machine comprising a base,

a work table reciprocably mounted thereon, a j

grinding Wheel slide movable towards and rom the'table, a grinding wheel thereon, al

a work table reciprocably mounted thereon,

a slide movable towards and from the table, a grinding wheel rotatably mounted thereon, a diamond for truing the wheel, a suppol for the diamond mounted on the base, a me ber carrying the diamond and movably mounted on the sup ort to position the diamond into or out o the .grinding zone, and

means whereby the diamond may .be reciproca-ted across the wheel face.' l

10. A grinding machine comprising a baise,

a work table reciprocably mounted thereon, a slide movable towards and from the table, a rindimr wheel rotatably mounted thereon, a iamond for truing the whee1,a reciprocable support mounted on the base, a. member carrying the diamond and movably mounted on said support for positioningthe diamond near oraway from the wheel, means for reciprocating'the supportto true the wheel,

andprecision mechanism for adjusting Lthe diamond accurately relative4 to the wheel.

11. A'grinding machine comprisinga base, a wheel guard fixed to said base, a grinding wheel therein,`a work-support, a truing tool holder movably 'supported on said guard, line precision means to adjust the position of said support to position thetruing tool in with-the wheel, a cross feed mechanism to feed the grinding wheel int the tool and power operatedmeansto reciprocate the tool across the face of the grinding wheel. 12. A grinding machine "com rising a base, a grinding wheel slide mova le thereon, a work support, a grinding wheel on said slide movable towards and "from the work support, a wheel guard lixed to the base, a truing tool, a support for said tool on said guardl movable to osition the truing tool 'in the line ofv Contact between the grinding wheel and the surface of the finished wrk or to move .the same out of operative relation with the agrinding wheel, a wheel guard fixed to said base, a diamond, a holder for said diamond,l

a support lfor said holder pivoted on said guard,.micrometer mechanism to adjust said holder relative to support, means to adjust said support relative to the guard to position the diamond so that it coincides with the line of contactbetween' the grinding Wheel and the finished Work,V power operated mechanism includinga motor on said guard to reciprocate the diamond across the face of the grinding Wheel and means to feed the grinding Wheel toward the diamond to true the faceof the Wheel.

` 14. A grinding machine comprising a base, a Wheel slide on said base, a grinding Wheel on said slide, a Wheel uard fixed to the base, a truing tool pivota ly mounted on said guard and adapted to be swung into and out of operative position, micrometer mechanism to adjust the position of said tool relative to the Wheel face, a feedingniechanism to feed the grinding` Wheel toward said tool and power operated mechanism'to reciprocate the tool across the face of the grinding v Wheel.

15. The method of grinding cylindrical Work pieces in duplicate sizes on a cylindrical grinding machine having a micrometer vcross feed mechanism for the Wheel, including an adjustable stop, and a reciprocable and adjustable truing diamond, comprising the steps of: (a) setting the cross feed 'stop to stop the infeed of the Wheel when the work piece has been ground to a predetermined size, (b) setting the diamond in the line of Contact of the Wheel and the finished Workpiece, (c) feeding the Wheel into the diamond after resetting the micrometer stop and thereby truing the Wheel, While its operative line of grinding contact remains unchanged as determined by the position of the diamond, and (d) subsequently grinding successive pieces of work to the same size by feeding the Wheel each time `to a final' position determined by the fixed location of the stop. i

Signed at Plainville, Connecticut, this 10th day of J une, 1927;V

CHARLES H.NoRToN.

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