US1784231A - Grinding machine - Google Patents

Description

Filed March 24, 1924 jgl;

latented Dec. 9, 1930 FREDERIC E. GARDNER,

PATENT OFFICE F BELOIT, WISCONSIN GRINIDING MACHINE Appiieation ined March 24,

This invention relates to an improvement in work carriers for machine tools,l and has particular reference to an improved carrier for feeding thin work blanks between the opposed faces of a pair of operating elements.

I have shown the invention applied to a grinding machine similar in general arrangement and operation to the Vmacl ine disclosed in my copending application Serial No. lli-7l, 585 filed June 3, 1921 (atent No. 1,649,823, issued Nov. 22, 1927). In that machine, the work blanks are fed by a reciprocating carrier between the overlapping faces of two opposed grinding wheels arranged in offset re lation. When grinding very thin work blanks,such as piston rings, thrust collars and the like, which are 1/8 to g of an inch in thickness, an extremely i thin carrier is re'- quired. Heretofore, carriers if made too thin have oener-all' been unsatisfactor i in that they were flexible and would bend when subjected to an end push, thereby being forced into accidental contact with the grinding wheels, and resulting in a consequent warping, distortion, and weakening of the metal.

rhe primary object of the presentinvention therefore is to provide a work carrier for very thin blanks which will not flex o-r bend materially in operation.

A more detailed object is to provide a thin flexible work carrier for feeding blanks between the opposed faces of two or more operating elements, said carrier being under constant tension in any direction of movement, thereby preventing flexure or undue bending of said carrier against said operating element.

Ancillary objects and advantages will become apparent as the description proceeds.

ln the accompanying drawings, Figure 1 is a fragmentary and partially diagrammatic view of a machine embodying` the features of my invention, the view being' partially in end elevation and partially in section along line i-i of Fig. a.

Fig. 2 is a fragmentary sectional view taken in the plane of line 2-2 of Fig. 1, and showing a plan view of the carrier proper.

Referring to the drawings, the grinding machine comprises generally a main base 10 1924., serialNo. 701,357.

on the opposite ends of which a pair of spindle carriages 11 are mounted in oll'set relation. Two parallel spindles 12 are journaled in the carriages 11, and are driven by any suitable means (not shown). Heads 13 are secured to the adjacent ends of the spindles 12, and support a pair of annular grinding disks or wheels 14 which overlap to the extent of their annular width. The central apertures of the grinding wheels are closed by a pair of guards 15 which are adjustably supported by rods 16 extending through the spindles 12.

lVork is periodically fed between the overlapping faces of the grinding wheels 111 by a carrier comprising a thin reciprocating strip 17 having an aperture or pocket 18 for holding the work blank 19. The strip 17 is suitably supported and guided at its opposite ends b-y brackets 2O secured' to the machine base 10.

Any suitable means may be provided for reciprocating the carrier` In the present instance, the driving end of the strip 17 is pivotally connected by a horizontal link 21 to the upper end of a vertical lever 22. The lever 22 is mounted at its lower end for oscillation upon a stationary shaft 23 on the base 10, and is formed rigid with a short lever arm 24 similarly mounted. At its upper end, the lever arm 24; is pivotally connected by a substantially horizontal link 25 to a power disk 26 mounted on a shaft 27. The shaft 27 is journaled in the base 10, and is driven by any suitable means (not shown). It will be seen that as the disk 26 revolves, .the lever 22 will o be oscillated and the strip 17 reciprocated, the rate of movement of each being the greatest while the work blank is passing between the wheels 14. rl`he work blanks are inserted into the aperture 18 when the strip 17 is in an extreme position, and are ejected therefrom when the strip is in the other extreme position.

Means is provided for tensioning the strip 17 to prevent accidental contact thereof with the faces of the guiding wheels 1/1. In the present instance, a flexible cable 28 is secured to the free end of the strip 17, extends over a pulley 29 supported by an outwardly extending bracket 30 on the base 10, and carries a Yce ythe carrier yfrom contacting with the faces of the grinding wheels, and increasing its life. The carrier is simple in construction and efficient in operation.

While I have illustrated my invention with considerable particularity, it is to be understood that various modilications and alternative constructions may be made Withoutdepart-ing from the spirit and scope oi the invention as expressed in the appended claims.

I claim as my invention 1. A grinding machine comprising, in combination, a base, a pair ot annulargrinding disks disposed in parallel relation and positioned to overlap to the extent oi their radial depth, a relatively thin wide flexible work carrier mounted forreciprocation between said disks with the width parallel to the grinding faces of said disks, said worky carrier being provided with an aperture for supportlng a work blank, power means engaging one end of said carrier for periodically drawing the carrier outwardly in one direc tion, and yielding means engaging theopposite end of said carrier to oppose the action of said first mentioned means.

Q. A grinding machine having, inY combination, a base, apair of annular grinding disks disposed in parallel relation and positioned tooverlap to the extent of their radial depth, a thin flat flexible strip between said disks with the width of said strip parallel to the grinding faces, said strip'being constructed to support a work blank, means on said base for guiding said stri p in its reciprocation between said grinding disks, a weight secured to one end of said strip and tending continuously to draw said strip in one direction, and a power means engaging the other on d of said strip and adapted to periodically draw said strip in the other direction whereby said. strip is maintained taut to prevent lexure againsr the faces of said grinding disks. y I

3. A grinding machine having, in combination, a grinding element, a flexible 'fiat strip mounted for reciprocation across the face of said element with the width oit' said strip being disposed/toward said tace, said strip being constructed to suitably carry a work blank, means cooperating with said strip to retain said work blank in position, means engaging one end of saidstrip and tending to Vdraw the latter continuously in one direction, and power means engaging the other end of said strip Yfor periodically moving said strip in the opposite direction whereby the strip is held taut trol the position of said strip.

5. Ina machine of the class described, in

combination, a base, an operating element having a flat face mounted on said base, a thin iat flexible work carrier strip for carrying a work blank positioned for movement across said face, the width of said strip being prosented to said face, means on said base for guiding said strip in its movement, a weight secured'to one end of said strip and tending continuously to draw said strip in one direction across said face, and power means engaging the other endof said strip and adapted to periodically, draw said strip in the otherjdirection.

6;.A machine of the character described having, in combination, a base, an operating element on said base, a thin fiat work carrier strip positioned for reciprocatory movement across said operating Yelement and having means for supporting the work, the dat ofthe strip being presented to said element, a pair of guide brackets'supportedon said base at opposite sides ot said operating element for guiding said strip in its reciprocation, power means engaging one end of said strip, and yielding means engaging the other end of said strip and tending to move said strip in one direction.

In testimony whereof, I have hereunto affixed my signature.

FREDERIC E. GARDNER.

element, a thin flat flex-y ICS

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