US2669074A - Grinding machine - Google Patents

Description

E, l.. HARLEY 2,669,074

' GRINDING MACHINE 3 Sheets-Sheet l al Y 1 g A .l

Feb. 16, 1954 Filed Dec,- 29, 195o 1 l x l l I L- IN V EN TOR Feb. 16, 1954A E. l.. HARLEY 2,669,074

GRINDING MACHINE Filed Dec. 29, 1950 .'5 Sheets-Sheet 2 IN VEN TOR.

mi? Y Mk1-WM Feb, v16, 1954 E. l.. HARLEY GRINDING MACHINE 5 Sheets-Sheet 3 Filed Dec. 29, 1950 s null .INS

. INVENTOR.

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vtypeffin which theA above and other objects as A Fig. lrepresents anendelevation'of-'a machine tie 01 tache'd tof! the eccentric shaftgfthev carni actuating `sa-id =arrn; the `dr-ive; 4for thefcam ,and thepswitch actuated fbyfthezarm, and

Patented Feb. 16, 1954 Awirrati-T OFFICE 2,669,074 GRINDING MACHINEv E-arlciiL Harley, Brooklyn, N. Y. Appliatitecemuer 29, 195o; seriarNo. 203;.2'13v 'awayfrom thegrinding roller, the feed, rate of grind, and'speedof rotationof the cylinder being automatically controlled.

yAnother"object is to producea grindinghmachine of 'the' character vrdescribed viny which the adjustable" cylinder is automatically stoppedwhenthe predetermined ar'no'untyof'y grindinghas beeniaccomplish'edl Another object is to produce la machineof the character described in whiclitheggrindinglsurd face .is maintained in an even conditionby meansl of ana'utomatic tension'y deviceassociated with the` strip of: abrasive material with which the grindingjroller is furnished.

Another'obj ect is Ato produce: a machine vofthe character described inwhich the: surfacev tobe ground or abraded'is adjustable with respectto the' abrasive rolle'rduringrotation of the cylinder ,supportn'gsaid surface.' l

A' furtherobject is v'to provide amachineofthis :zo will hereinafter be described may 'be' attained.`

, Alpr'actical embodimentr of my invention is'replresented in the accompanying drawings in which:

constructed according to my invention;

Fig: 2 represents a'front elevation,v partlybrokenaw'ay, ofthe lformshown in Fig- 1.l

`Fig. v3 representsiarvertical longitudinal se'ctio'n takerion the lineIIIeLIII ofFig'.r l'looking inthe direction ofthe arrows;v

' resetsfapartialdetail setionftaken n 'IVfofFig3:10okingithi direcf"th"e arrow/si 5 represents l av detail "showing 'Contactv` of Broadlym'y invention comprises a. grinding machine including means for maintaining the grinding surface under tension and other interrelated means'fo'r controlling the grinding operation' through automatic control of the cylinder supporting thearticle to be ground together with the drivefor said cylinder.

Referring to theaccompanying drawings, the frame of the machineis' shown as comprising a lowercasting I supportingjan upper casting 2 which is' bolted thereon or otherwise secured thereto. Supportedinthejlower part of casting I are two motors 3fand4`of different horsepower which provideY a'drive' for various elements of the maclniine as will hereinafter be described. Situated on the same level as the motors is a reductiongear 5 which is in turn connected to a reduction gearai'lxed to the upper casting 2. The said upper casting is provided with the usual pillow blocks l, 8 whichare adapted to support the eccentric end's'g of the shaft 9. Ro'tatably supported on the shaft 9 are interior ball bearings II, I2 whichare secured in opposite ends of cylinder It. AAlso a'ixed to the end of cylinder I I is a sprocket I3adapted to receive the chain I4, which is driven` by its connection with the sprocket I mounted ,on the shaft I 6, which is the' output shaftof the lower reduction gear.

The'suppor'ting cylinder Ill is provided with scribemarks I'I, I8 adjacent its ends in order'to vrdelirnit the surface to which the surface to be ground may be afxed. These surfaces may be printing plates I9, of various materials or offset blankets. As shown in Fig. 2 rubber printing plates are affixed so that their edges are not parallel to the cylinder axes by placing masking tape 2|, 22 across'the leading edges, the tail of the plate being'leld to the cylinder by a plurality of tabs denoted'collectively by 23.

Mounted in parallelism with the longitudinal axis vof the cylinder IIl is a grinding roller provided an abrasive surface 25 held thereon ,undertension as described in my'copending application' Serial No?? 203,314 filed December 29, 195o, new'Partanna-2,630,657, dated March 1o,

(1953i This'rollerZd is mounted on a shaft -26 .formed integral therewith and shaped at 21 to accommodate" a belt 28 driven from the larger motor 4l hereinabove described. The ends of shaft 26`o`f theroller 24 are suitably journaled in mountings YZi'lfandtil bolted or otherwise secured to thetop o`fca`sting=2 as shown in Figs'. 1 andv 2.

Rotatably Vmounted beneath and in contact with the`oute'r surfaceofcylinder I9 is the rotary'brush 3'I which is driven fromthe opposite ed ofthe" larger' motor 4 .byvvhich' the roller M is driven through its belt 32. It will be noted that the brush 3| and roller 24 rotate in the same direction as the cylinder I and both the brush and roller are rotated at a constant and the same speed. Beneath the brush 3| I provide a receptacle 33, having three vertical sides uprising from the bottom, to receive the ground material and permit its removal therefrom. This receptacle may be supported in any well known or approved manner and is not ordinarily removable.

Attached to the outer end of casting 2 is a graduated scale 34 (shown in Fig. 1) and having a pointer 35 adapted to co-act therewith, said pointer being secured to a knob 36 carried by one of the eccentric ends 9 of shaft 9.

Also connected to an eccentric end 9 of the shaft 9 is an arm 31 having a split end 38 which enables it to be clamped to the shaft 9 by means of a set screw 33. This arm extends laterally and terminates in a roller 40 which is held in contact with the peripheral surface of an S shaped cam 4| by means of a spring 42 connected to the said arm at one end and to the casting at the other end by means of a rod or other connection 43. The arm 31 has an elbow 44 adapted to contact and actuate a switch 45 as will be described below. Cam 4| is driven through its connection 53 with the output shaft 4E of the upper reduction gear, which in turn is driven from the lower reduction gear by driving means 41, which gear is driven from the smaller motor 3 by a chain and sprocket connection.

At the front of the machine are provided switches 48 and 49, switch 4B being connected with switch 45, as shown in Fig. 8, and switch 49 being connected with the larger motor 4.

Switch 43 controls the operation of the motor 4 which is 3 phase, 60 cycle 220 volt by manual operation of said switch.

'I'he operation of the single motor 3 is controlled by automatic switch 45 and manual switch 48. When the automatic switch 45 is in position A switch 48 is turned to position A to start motor #3. When the grinding cycle has been completed the arm 31 having an elbow 44 activates automatic switch 45 moving it into position B, thus, stopping the motor 3. To start motor 3 again, it is necessary to manually operate switch 4S by moving it to position B.

The operation of the machine is as follows:

Plates I9 and 2G are afiixed to cylinder l0 with their backs exposed, as shown in Fig. 2, by means of tapes 2|, 22 and tabs 23. The larger motor 4 is started by manually throwing switch 49, which will rotate the grinding roller 24 and the brush 3| at the same speed through means previously described. Arm 31 is adjusted on shaft 9 with respect to cam 4| so that when the arm roller 40 is in the depressed portion of the cam, the pointer 35 will show the thickness to which the plate will be ground. At this point the switch 48 is actuated, which starts the smaller motor 3 and rotates the cylinder I0 carrying the plates |9 and as well as rotating the S shaped cam 4|. As the cam turns it will be seen that the roller 40 riding on the cam surface Will raise the arm 31, which is clamped to shaft 9, and will advance the eccentric bearing carrying cylinder |0 on shaft 9 toward the grinding roller 24. It will thus be seen that the surface to be ground is slowly advanced toward the rotating grinding surface as the cylinder l0 and the cam 4| are rotated. The cam 4| is so shaped that during the latter several revolutions of cylinder I0 prior to the completion of the grinding operation the roller 4|] will ride on a"f1at on the cam 4|. This insures the completion of the grinding operation to the desired degree. When the roller reaches the end of this fiat on the cam due to the continuous rotation of the latter, the arm 31 will be pulled down into the low portion of the cam 4| by means of spring 42 mounted as described above. This action of the arm 31 causes its elbow 44 to contact and actuate the switch 45. The latter being a double pole, double throw switch and being inter-connected with switch 48 operates to stop the smaller motor 3 which, as described above, serves to drive cylinder |0 and the cam 4|. The action of the arm will also serve to re-set the eccentric bearing to its starting position. The plates I9 and 20 having been ground to the desired degree may now be removed from the cylinder I0 and trimmed for use in a printing press. To stop the grinding roller 24 and the brush 3| it is necessary to throw the switch 49 manually.

Removable covers 50 and 5| may be provided for the front and back of the machine if desired and they are secured in any well know or approved manner to the castings and 2.

It will be understood that there are two sources of current supply, one for each motor, the larger being a three phase motor, as shown in Fig. 8.

It will also be understood that printing surfaces of printing plates may also be renished in this machine by adhering them with the printing surface outward so that it may be contacted by the grinding roller surface.

Since it is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, I do not intend to be limited to the particular embodiment herein shown and described except as set forth in the claims.

What I claim is:

1. A machine of the character described for grinding an object comprising, a rotatable grinding roller, a rotatable support for the object to be ground, a gauge attached to said support for setting the grinding depth, means for rotating the roller at one speed, other means for rotating the support at a lesser speed, eccentric bearings in said support, an arm connected to said bearings, a switch controlling said support rotating means, a projection on said arm in proximity to the switch, a roller on said arm, a cam engaging said roller, cam driving means, and a common frame for supporting said elements, the elements being so constructed and arranged that when the gauged depth has been attained the arm projection moves and actuates the switch to stop the support rotating and the cam driving means.

2. A machine of the character described for grinding an object comprising, a rotatable grinding roller, a rotatable support for the object to be ground, a gauge attached to said support for setting the grinding depthJ means for rotating the roller at one speed, other means for rotating the support at a lesser speed, eccentric bearings in said support, an arm connected to said bearings, a switch controlling said support rotating means, a projection on said arm in proximity to the switch, a roller on said arm, and an S-shaped cam engaging said roller, means for driving said cam, a common support for all of said elements, the parts being so constructed and arranged that when the gauged depth has been attained, the arm projection actuates the switch to stop the rotating means for the support and said cam, the support being rotated for a period subsequent to the attainment of the grinding depth as determined by the shape of the cam surface engaging said roller before the roller arm projection actuates the switch to stop the support rotating means.

3. A machine of the character described for grinding an object comprising a rotatable grinding roller, a rotatable support for the object to be ground, means for rotating the roller, other means for rotating the support, and a third means for bringing the support into operative relationship with a roller surface plus interconnected controls for the support rotating means operable by a switch for controlling the support rotating means and including a driven cam, a roller riding thereon and an arm carrying said roller, said arm being connected to the support and carrying an element thereon between its ends 6 for actuating said controlling switch when the grinding operation has been completed.

EARLE L. HARLEY.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 341,581 Kirchner May 11, 1886 1,073,288 Robertson Sept. 16, 1913 1,187,729 Hanson June 20, 1916 1,575,968 Bryant Mar. 9, 1926 1,627,983 Maickel May 10, 1927 1,651,501 Baker Dec. 6, 1927 1,884,293 Schurr Oct. 25, 1932 2,028,315 Bruhl et al. Jan. 21, 1936 2,138,535 Connor Nov. 29, 1938 2,321,383 Harper June 8, 1943

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