US1835668A - Grinding machine - Google Patents

Description

Dec. 8,1931. w. PEAsLEE '1,835,668

GRINDING MACHINE Filed June 1l, 1950 3 Sheets-Sheet'V l Jwvmtoc Dec. 8, 1931.

W.' PEASLEE GRINDING MACHINE Filed June l1, 1930 5 Sheets-Sheet 2 8, 1931. W, PEASLEE 1,835,668

GRINDING MACHINE Filed June ll, 1930 5 Sheets-Sheet 5 fr 1:9, gwvemoi Patented Dec. 8, 1931 Y UNE-TED STATES PATENT ori-'rca WILLETTS PEASLEE, 0F CINCINNATI, OHIO, ASSIGNOR TO CINCINNATI GRINDERS IN- CORPORATIEXD, 0F CINCINNATI, OHIO, A CORPORATION OF OHIO GRI-NDING MACHINE appiicatidnmea June 11, 1930. serial No. 460,491.

This invention relates to improvements in grinding machines and especially to improvements in what are known commercially as centerless grinders.

An object ofthe present invention is the provision of a centerless grinder forthe production of long work pieces, such as bars, shafts, tubing and the like.

Another obj ect of the invention is the` provision of improved means for use with'centerless grinders for returning work pieces from the discharge side of the machine. to the entrant side thereof and positioning said pieces to have successive operations performed thereon.

Another object of the invention is the provision of an improved novel work supporting mechanism for long Work pieces that may be applied to existing standard centerless grinders whereby the production of the said standard centerless grinder is materially increased' and the lost time heretofore necessary for returning said work pieces to the entrant side of the machine is reduced to a minimum.

A further obj ect of the invention is the provision of a centerless grinder adapted to perform successive grinding operations on'relatively long work pieces so that the operator need not leave his normal station while effecting the said successive grinding operations or to retrieve the work pieces after the said operations as was necessary with, the devices heretofore employed.

Other objects and advantages of the present invention should be readily apparent by reference to the vaccompanying drawings forming a part thereof and it is to be under'- stood'that any modifications may be made in the exact structural details 'within the scope of the appended claims without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a perspective view of a grinding machine embodying the improvements of this invention.

Flgure 2 is a similar perspective view showlng the rear of the machine shown in Figure l;

Figure 3 is a` sectional view taken on line 3-3 of Figure l.

-Figure 4 is a fragmentary elevational view of certain parts shown in Figure 3.

Figure 5 is an elevational view of'certain parts shown in Figure l just outside of the grinding throat and illustrating particularly the control lever for returning work pieces to the entrant side of the grinding machine.

Figure 6 is a View of the work supporting mechanism as seen from the regulating wheel side thereof with certain parts in elevation and others in cross section.

Figure 7 is a sectional view taken on line 7--7 of Figure l.r

Figure 8 is a diagram of the electrical circuit.

Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

Heretofore centerless grinding machines have been utilized for performing grinding operations on the surfaces of long bars, line shafts, tubes, and other circular articles of considerable length. To obtain the desired finish on the said surfaces it is frequently necessary to pass the work pieces several times through the grinding throat to perform a number of cuts thereon, each cut adding to the finish until the desired finish is obtained. In the past it was necessary to manually carry the Work piece from the discharge side of the -machine to the entrant side thereof or provide a crane or the like adjacent the grinding machine for the purpose of mechanically returning the said work. This was either very fatiguing to the operator or involved the additional considerable expense of providing the crane or other mechanical lift. Either method, however, wasv expensive, inefficient and resulted ,in delays and materially reducing theproductive hours of the machine and caused the operator to repeatedly leave his station to return the -work. By this invention all of these objections and disadvantages have been elimiing wheel 11 rotatable at a high grinding rate of speed by any desirable means in a clockwise direction as indicated by the arrow thereon, as seen in Figure 1. Inopposition to the grinding wheel 11 is a regulating wheel 12 rotatable in a clockwise direction as indicated by the arrow thereon at a relatively slow rate of speed. The proximate surfaces ot the grinding and regulating wheels travel in opposite directions and are spaced from one another to provide a grinding throat in which the work is received. The regulating wheel 12 is supported by a spindle 13 rotatably journaled in a housing 14 forming the upper slide of a regulating wheel unit. The upper slide or housing 14 is slidably supported by a lower slide 15 in turn slidable along suitable ways 16 formed on the bed 10. To adjust the slides 14 and 15 relative to one another and to the bed 10 there has been provided an adjusting screw 17 journaled at its outer end in a bracket 18 secured in any suitable or desired l manner to the bed 10. rIhe inner end or threaded portion of the screw 17 is received in a nut 19 rotatably but non-translatably carried by the housing or upper slide 14. A hand wheel or the like 2() is rotatablycarried by the housing 14 and is provided with a screw or the like for lrotating the nut 19 and adjusting the regulating unit. Suitable clamps 21 and 22 may be provided for respectivelysecuring the lower slide 15 to the bed andthe upper slide 14 to the lower slide 15 whereby the upper slide may be adjusted relative to the slide 15 or the two slides may be adjusted as aunit relative to the bed 10.

Carried by the lower slide 15 at its inner end is a block 23 adjustably supporting a work rest blade 24 which has an inclined top 25 extending in the direction of the active surface of the regulating wheel 12 and forming a work receiving trough therewith. The blade 24 is adjustable vertically of the block 23 by a bar 26 having one or more inclined cam faces 27 for raising plungers 28 which abut the lower end of the blade 24. The said blade may then be clamped in the desired position by clamp arms 29. The arms 29 are pivotally mounted and adapted to be actuated about their pivots by a clamp screw 30. Secured to or integral with the block 23 and extending from opposite sides thereof are sockets 31 and 32, each receiving one end o bars 33 and 34 which are secured therein by cap screws 33a and 34a. The bars 33 and 34 are generally of a length equal to the length of the longest bar to be operated upon by the machine and respectively support the mechanism for aligning the work with the grinding throat and for receiving Ythe work after it passes through the said 'grindingthroat as well as supporting the mechanism for returning the work from the finished side 'of the machine to the entrant side thereof.

rIhe work aligning and receiving mechanism comprises a plurality of similar units 35, shown most clearly in Figure 7 and since each of the units are duplicates of one another it is deemed sutiicient it but one of them be described in detail. The said units 35 comprise a pair of arms 36 and 37 each having a collar 38 at the lower end thereof received on the supporting bar 33. The collar 38 is transversely slit to form ears 39 and 40 through which clamp screws 41 extend Jfor drawing them toward one another and frictionally clamping the arm to the said 'bar 33. The ear is provided with a linished :tace 42 underlying a lug 43 .extending from a similar ear 40 formed on the collar of arm 37. An adjusting screw 44 extends through thc ear 43 and has its lower end abutting the tace 42. From this it will be noted that the arms and 37 may be adjusted relative to one another about the axis of the bar by the adjusting screw 44 and then clampedin position by clamp screws 41. The arm 36 is provided at its upper end with a pair of tappeti bores receiving the threaded end of cap screws 45 which extend through a slot 46 formed in carrier 48. The adjacent surfaces oi' arm 36 and carrier 48 abut one another and are clamped in engagement by the cap screws 45. The carrier 48 is provided with a lug 49 which overlies the end of the arni and has extending therethrough an adjusting screw 50 for abutting the said end oi' the arm 36. A support ing roller 51 is rotatably supported by the carrier 48 and engages the surface of the work 52 being operated upon. By reference to Figure 7 edge of roller 51 is aligned through the adjusting screw 50 with the plane of the inclined top 25 ofwork rest blade 24. A second roller 53 is carried by the arm 37 being rotatably supported by a carrier 54 adjustable through guide way 55 formed in the end of said. arm 37 andthe carrier 54 is secured in adjusted position by a suitable screw or bolt Again referring to-Fgure 7 it will be noted that the carrier 54 is adjustable to align the contacting point of roller 53 with the point of contact of the regulating wheel 12 with the work 52.

From the foregoing description it will be apparent that work supporting troughs consisting of rollers 51 and 53 are provided on f opposite sides of the machine, one for aligning the work prior to its entry within the grinding throat and the other for receiving the work as it passes from the said grinding throat. It will be noted that no canting or misalignment ot the work is possible and consequently work of a true diameter will result.

' As noted above, to obtain the proj-cr iinish on the work it is necessary that sai 'l Work be passed through the grinding throat more than once which necessitates the work piece it will be noted that the contacting being returned from the finish side of the machine to the entry side thereof and to facilitate this return of the wrk the following mechanism is employed. Mounted on the supporting bars 33 and 34 intermediate the units 35 are a plurality of raising units 57 each of which is a substantial duplicate of one another and a description of one of them is believed will suiiice for all. `Accordingly, each unit comprises a trunnion member 58 rigidly secured to the bar 33 by a set screw or the like 59. Opposite ends of the member 58 are provided with threaded perforations 60 receiving threaded ends 61 of studs 62 and 63. A crank 64 is mounted about the l stud 62 and has formed on its lower end a perforation 65. A similar crank 66 is mounted about the stud 63 likewise having a perfora-f ton 67 formed in its lo-wer end. in alignment with the perforation 65 through Which a bolt or connecting member 68 extends. The bolt 68 being locked in position by lock bolts 69. The cranks 66 are on the right hand side o f the supporting bar 33,`as seen in Figure 1, or on the side adjacent the operators position. Each crank 66 supports a roller 70 received between collars 71 and 72 secured to a shift bar 73. The shift bar 73 is slidably mounted at one end in a bearing 74 carried by the bar 33 and at its other end through a bearing 75 carried by the bar 34. An additional sliding bearing 76 is provided on the bracket 31 adjacent the grinding throat. From this it will be seen that the shift bar 7 3 is supported at its opposite ends as well as at the center thereof. A pair of collars 77 and 78 are secured to the bar 73 near the bearing 76 and receive a pin 79 extending from tongue 80 of lever 81. The lever 81 is-pivotally mounted at 82 intermediate its ends and is provided with an operating handle 83 at the upper end thereof which is in convenient reach of the operator.

From the foregoing it will be noted that actuation of the lever 81 about its` pivot 82 will shift the rod.73 and through the collars 71 and 72 will rock cranks 66 and 64. The cranks 66 have each keyed to it a lever 84 having guide way 85 formed at their upper ends receiving the ends of adjustable carriers 86. Cap screws 87- lock the carriers 86 in adjustable positions on the levers 84. A roller 88 is rotatably supported by each carrier 86. rlhe cranks 64 llkewise have keyed to them for rocking movement therewith levers 89 similar to levers 84 each adjustably supporting a carrier 90 having a roller 91 rotatably secured thereto.

Rocking movement of cranks 64 and 66\ through the lever 8l correspondingly rocks or oscillates the levers 84 and 89 and rollers 8,8.

and 91. By referring to Figures 5 and 4 it will be noted that the lever 81 may be actuated in a counter .clockwise direction or to the left, this will shift shift rod 73 toward the right and raise the lever 84 from the position shown in full lines in Figure 4 to the position shown in dotted lines therein for raising the work 52 upward to the dotted line position. At this time the work is in the position shown in dotted lines in Figure 3 where it will be seen it is free of the surfaces of both the grinding and regulating wheels. The operator may then draw the work through the grinding throat from the finished side of the machine to the other side thereof whereupon actuation of the lever 81 in a clockwise direction will lower the work piece to the operating position.

To rapidly returnthe work piece from the finished side of the machine to the operating position the roller 88 adjacent the grinding throat on the rear and as shown in Figure 2, is provided with an extending shaft 92 receiving a sprocket about which sprocket cha-in 93 is trained. The chain 93 also eX- tends about a sprocket 94 fast on the end of motor shaft 95 which extends from motor or prime mover 96. The motor 96 may be controlled by a switch 97 secured to bracket 23 and has a switch plunger 98 extending therefrom. The plunger 98 is spring loaded and adapted to be depressed for completing the electrical circuit by a lug 99 formed on the lever 81 so that when the said level` 81 is actu ated to rock the lever 84 and raise the work to the position for returning same to the operator, the motor 96 is energized. It will be noted however, that the lever 8l has a substantial movement before the closing of the switch 97 so that the work is free of the grinding and regulating wheels before the return movement thereby preventing any possible' damage from the said wheels.

What is claimed is:

1. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a work rest subtending the grinding throat and forming a work supporting trough with the face of the regulating wheel, means on opposite sides of the throat forming a guiding trough for introducing work pieces to the grinding throat and receiving said work after it passes from the throat, and means for supporting the work above the receiving trough for re I 3. In a device of the class described the combination of a bed, opposed grinding and regulating wheels carried thereby forming a grinding throat therebetween, a work rest within the throat for supporting a work piece during the grinding operation, a block for the work rest, a supporting bar extending from the block, means carried by the bar for forming a work receiving trough to receive the work as it passes from the grinding throat, and additional means carried by the supporting bar normally inoperative but actuable to a position for raising the bar above the Work receiving trough and returning the Work reversely through the grinding throat.

4. In a device of the class described the combination of a bed, opposed grindingr and regulating wheels forming a grinding throat therebetween, a work rest within the throat 'for supporting a work piece during the grinding operation, a block for the work rest, a supporting bar extending from the block, means carried by the bar for forming a work receiving trough to receive the work as it passes from the grinding throat, and additional vmeans carried by the supporting bar normally inoperative but actuable to a position for raising the bar above the work receiving troughA and returning the work reversely through the grinding throat, said means coniprising a plurality of pivoted arms normally lying below the work receiving trough but projectible above said trough to raise the work clear of the grinding and regulating wheels.

5. In a grinding machine the combination of a bed, a grinding wheel carried thereby and operable at a high grinding rate of speed, a

regulating wheel in opposition to the grinding wheel operable at a slow work rotation controlling rate of speed, a block carried by the bed beneath the grinding throat for supporting a Work piece in opposition to the thrust of the grinding Wheel, a supporting bar extending from opposite sides ot the rinding throat, a plurality of units supported by the bars those on the one side ot the throat positioning the work for introduction to the throat and those on the other side ot the throat receiving the ground work, and a plurality of additional units carried by the supporting bars Jfor raising the work from the ground work receiving means to a positioii, there-above for returning theliyyork to the in?" troducing means.

6. In a grinding machine the combination of a bed, a grinding wheel carried thereby ant operable at a high grinding rate ot speed.

i: ilegulating wheel in opposition to the grinding-'wheel operable at a slow work rotation controlling rate of speed, a block carried the bed beneath the grinding lthroat for supporting a work piece in yopposition to the thrust of the grinding wheel, a supporting barv extending from opposite sides of the grinding throat, a plurality 'of units supthe ground Work receiving means to a position there-above for returning the work to the introducing means, each of last mentioned units comprising a pair of arms having rollers rotatably secured to the upper end thereof for supporting the bar for movement therealong, and means simultaneously shifting the said arms.

7. In a grinding machine the combination of a bed, a grinding wheel carried thereby and operable at a high grinding rate ofspeed, a regulating wheel in opposition to the grinding wheel at a slow Work rotation controlling rate of speed, a block carried by the bed beneath the grinding throat for supporting a work piece in opposition to the. thrust of the grinding Wheel, a supporting bar extending from opposite sides of the grinding throat, a plurality of units supported 'by the bars those on the one side of the throat positioning the Work for introduction to the throat and those on the other side of the throat receiving the ground Work, a plurality of additional units'carried by the' supporting bars for raising the Work from the ground work receiving means to a position there-above for returning the Work to the introducing means, each of said last mentioned units comprising a pair of arms having rollers rotatably securedto the upper end thei eof for supporting the bar for movenient therealong, and a slide rod slidably carried by the supporting bars, and means connecting the slide rod to the arms, and means for actuating the slide rod to actuate the arms.

8. In a machine tool organization the combination of a bed, a tool carried thereby, a work support carried by the bed adjacent the tool for supporting a Work piece While being operated upon by the tool, means carried by the bed for initially supporting the Work piece in a plane parallel with the Work support and for introducing said work onto the work support and for receiving the work from the work support, and means shiftable from an inoperative position to an operative one 'l'or positioning the work in a plane parall l with the plane of the work support but )aced therefrom to return the Work to its initial posi-tion.

9. In a centerless grinder for operating on long work pieces the combination of a bed, a grinding wheel, a regulating wheel in opposition to the grinding wheel and a Work support intermediate the said'wheels, the grinding and regulating Wheels and work support forming a grinding throat having an entrant side and 'a discharge side, means on the entrant side of the throat for supporting a work piece to be introduced into the grinding throat, means on the discharge side of the throat for receiving the work from the griiding throat, and addititional means on the discharge side of the throat for positioning the work in a plane parallel with the work support but spaced therefrom and for returning the work to the entrant side of the throat.

10. In combinationwith a centerless grinder comprising a pair of opposed grinding `and regulating wheels forming a grinding throat therebetween having an entrant and discharge side, and a work rest in the grinding throat, of means for receiving a long work piece as it passes from the discharge side of the grinding throat, and additional means 'for returning the work piece to the entrant side of the rinding throat.

11. In com ination with a centerless grinder comprising a pair of opposed grinding and regulating wheels forming a grinding throat therebetween havin-g an entrant and discharge side, anda work rest in the grinding throat, of means for receivin a long `work piece as it passes from the ischarge side of the grinding throat, additional means for returning the work piece to the entrant side of the grinding throat, said means comprising a plurality of pivotally mounted arms normally inoperative, and manual means 'for actuating the arms to raise' the work above l the grinding throat. y

In testimony whereof I aiiix my signature.

WILLET'IS PEASLEE.

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