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Shashicage Thus, the position of the grinding wheel with respect to the regulating wheel is determined by the rotatable position of the eccentric 65 and the adjustment of the extensible link. Another object of this invention is to provide a single cycle centerless grinding machine for infeed grinding operations. The spring has sufficient tension to normally eliminate any lost motion between the carrier and shaft whereby during rotation of the shaft through an arc necessary to move the carrier from a grinding position to its work loading position the two move as a unit.
The end of the screw is provided with a square head 26 to which a suitable socket wrench may be applied for rotating the screw. The grinding wheel The spindle 32 for the regulating wheel 14 is suitably journaled in the housing and is provided on the end with a driving pulley 33 which is connected by one or more V-belts 34 as shown in Figure 2 to a power pulley The plunger 70 is provided with a bore 12 in which the spring 73 is mounted and an adjusting screw 74 is provided for varying the tension of the spring, the screw being threaded in a fixed part of the machine.
It is especially suitable for grinding small parts which are susceptible of being ground by the infeed grinding method and the machine is provided with a single manual control which is movable in one direction to effect insertion of the work and completion of the grinding operation, and in the other direction to effect retraction of the grinding wheels and removal of the work from the grinding throat, whereby the machine may be readily operated by relatively unskilled operators.
Since the whole weight of the grinding wheel and part of its driving mechanism is supported on the threaded connection in the extensible link, thereby creating a large amount of friction, when adjustments are necessary and since the eccentric shaft must lift the entire weight of the grinding wheel during grinding operations, means are provided for counter-balancing all of the weight of the grinding wheel so as to provide a definite bias on the grinding wheel support structure in an upward direction, thereby necessitating a slight pull by the operator to move the grinding wheel down during the grinding operation.
Cincinnati No. Referring to the drawings in which like reference numerals indicate like or similar parts: A backstop blade 83 is also supported by the side walls to support the work during loading operations and insure that the work is pushed into the grinding throat upon rotation of the work carrier to a grinding position. This is accomplished by forcibly causing retraction of the plunger The link 58 has an internally threaded rotatable sleeve 60 mounted therein which makes a threaded connection with a connecting rod 61, centwrless connecting rod having a coupling G2 fixed to the end thereof in which is formed a bore 63 as shown in Figure 3 by which it is mabual on an eccentric portion 64 of an operating shaft By means of the eccentric adjustment of the pulley 47 suitable tension may be obtained in the belts The pulley 47 serves to drive the grinding wheel spindle through V-belts 49, and pulley 50 attached to the end mamual the spindle A fixed reference mark 68, as shown in Figure 1, cooperates with the dial to indicate the amount of adjustment effected.
It will be obvious that in cases where the machine is mounted on a bench or table that the motor may be mounted on the underside of the table top and a suitable opening provided through which the belts may run. The wheel 12 constitutes a grinding wheel which rotates clockwise as indicated by the arrow 13 and the wheel 14 constitutes a regulating wheel which also rotates clockwise -as indicated by the arrow An additional object of this invention is to provide improved means for lateral insertion and removal of work with respect to the grinding throat of a centerless grinding machine.
Referring now to the manuzl and more particularly to Figure 1, the reference numeral 10 indicates the frame or housing of the machine proper while the reference numeral 11 indicates, in general, one form of pedestal or support upon which the machine may be mounted or supported.
Centefless of the objects of this invention is to provide an improved simplified bench type grimder grinding machine. This invention relates to machine tools and more particularly to improvements in grinding machines. This concinnati is effected by an adjusting screw 22 which is threaded in the housing at 23 and held against axial movement by means of an annular flange 24 which partially fits in a groove grindef formed in the face of the guideway This machine, being of the centerless type, is provided with a pair of opposed abrasive wheels and as more particularly shown in Figure 2.
In a centerless grinding machine having opposed grinding and regulating wheels, the combination of means for adjustably supporting one of said wheels for infeeding movement relative to the girnder wheel, a work carrier movable from a loading position to a grinding position between said wheels, a rotatable shaft for actuating said carrier and a link connection between said shaft and said adjustable wheel for effecting simultaneous movement of the grinding wheel and the carrier.
The annular surface 80 between the end flanges of the work is the surface to be ground and the grinding wheel 12 is made of sufficient width to engage the entire surface so that the grinding operation may be performed by what is known in the art as the infeed grinding method.
The pintle 41 has an extension 46 upon which is mounted an eccentrically adjustable pulley 47, and in order to adequately support the pulley an additional pillow block 48 is provided for supporting the free end of the extension It will be noted from Figure 2 that the coupling 62 extends laterally with respect to the axis of the connecting rod 61 and any movement of the eccentric 64 about the axis of the shaft 65 will cause the extensible link 58 to pivot about the trunnions Thus, during movement of the handle 90 in a counterclockwise direction the work carrier is moved from a loading position to a grinding position and the eccentric 64 simultaneously moves the grinding wheel toward the regulating wheel.
Search Expert Search Quick Search. In a centerless grinding machine having opposed grinding and regulating wheels adjustable to form a grinding throat therebetween, the combination of a work carribr operable grinde move work into and withdraw work laterally from the grinding throat to position work for grinding purposes, a manual control lever, and motion transmitting connections from said lever for actuating the carrier and for relatively adjusting said wheels.
A fishtail gib 29 is provided for insuring a gfinder fit between the guide surfaces, and an adjusting screw 30 and lock nut 3 secure the gib to the slide 21 for griner therewith.
Thus, the plunger exerts a counterclockwise force on the shaft 41, producing a definite upward bias on the grinding wheel As shown in Figure 2, the motor 54 may be mounted beneath the machine and supported on the underside of the machine base and a suitable cavity cut in the top of the pedestal II so that the motor may be attached and made part of the machine.
GIMP 2. The regulating wheel 14 is made of sufficient width to also engage this surface with enough frictional pressure to rotate the work at a predetermined rate during the grinding operation. This is accomplished by providing a depending lug 69 from the shaft 41 for engagement by a spring pressed plunger 70 mounted in a bore 71 provided in the wall From Figure 3 it will be noted that the eccentric portion 64 of the shaft is integral with the remaining portion of the shaft and that a manually operable handle 90 is attached to the end of the shaft to effect rotation thereof.
This invention aims to provide a small compact and simplified centerless grinding machine of such a nature that it may be mounted on a bench or table, or as shown in Figure 1 of the drawings upon a pedestal specially provided for the purpose. Grincer is claimed is: In order to provide for adjustment of the grinding wheel toward and from the regulating wheel during grinding operations the bracket 40 is bifurcated to form a pair of arms 57 embracing an expansible link A stop screw 89 threaded in a fixed part of the machine serves as a stop to limit the counterclockwise movement of the carrier and determine its grinding position.
Cincinnati Centerless Grinder Manuals In a centerless grinding machine having a grinding wheel and a regulating wheel supported for rotation on parallel axes to form a grinding throat therebetween, the manuxl of a work carrier supported for oscillation about an axis parallel to the axes of said wheels, a work rest blade mounted on the carrier for movement into the grinaing throat, additional means on the carrier for supporting a work piece adjacent said blade whereby upon movement of the work into the grinding throat the blade will absorb the grinding thrust, and stop means for limiting the movement of the carrier.
The wall 18 is provided with a dovetailed guideway centrrless as more particularly shown in Figure 3 upon which a spindle housing 21 for the regulating wheel 14 is mounted for adjustment. The interior of the machine housing is provided with an angular partition or wall, one portion 18 of which cinxinnati at a steep angle and this portion intersects the horizontal portion In a centerless grinding machine having a grinding wheel and a regulating wheel adjustably mounted in opposed relation to form a grinding throat therebetween, the combination of oscillatable means for inserting and withdrawing work laterally of the grinding throat, said means including a work rest blade for absorbing grinding thrust on the work, and a control lever manyal connected for actuation of said means and adjustment of one of manuaal wheels.
The periphery of the flange 24 is provided with micrometric graduations 27 and a pointer 28 fixed to the support cooperates with these graduations to indicate the amount of adjustment effeced by rotation of the adjusing screw. In a centerless grinding machine having a grinding wheel and a regulating wheel supported in opposed relation to form cincinnafi grinding throat therebetween, the combination of a work carrier movable laterally to the axis of the grinding throat for work inserting and grindeg purposes, said work carrier having a work rest blade mounted grinedr for movement therewith, stop means for limiting movement of the carrier into the grinding throat to determine the position of the work rest blade with respect to the axis of the grinding throat, and means simultaneously movable with the carrier for adjusting one of said wheels relative to the other.
There has thus been provided an improved compact centerless grinder of the bench type which is simple in construction and operation, making it suitable for inexperienced operators, and which has improved means for inserting and removing work, and a single control for the work handling means and the wheel feeding means.
Reverse movement of the lever of course effects retraction of the parts. Related Posts
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Tur At the moment that the work carrier hits the stop screw 89 the movement of the work carrier ceases, but grindder movement of the grinding wheel toward the work continues until the grinding wheel has reduced the work to size. A fixed reference mark 68, as shown in Figure 1, cooperates with the dial to indicate the amount of adjustment effected. The interior of the machine housing is provided with an angular partition or wall, one portion 18 of which is at a steep angle and this portion intersects the horizontal portion A stop screw 89 threaded in a fixed part of the machine serves as a stop to limit the counterclockwise movement of the carrier and determine its grinding position. Thus, during movement of the handle 90 in a counterclockwise direction the work carrier is moved from a loading position to a grinding position and the eccentric 64 simultaneously moves the grinding wheel toward the regulating wheel. A fishtail gib 29 is provided for insuring a tight fit between the guide surfaces, and an adjusting screw 30 and lock nut 3 secure the gib to the slide 21 for movement therewith. As shown in Figure 2, the motor 54 may be mounted beneath the machine and supported on the underside of the machine base and a suitable cavity cut in the top of the pedestal II so that the motor may be attached and made part of the machine.
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