US2534882A - Milling head - Google Patents

Description

INVENTOR. .S'afvaf f, Slrr BY )wam WM.

A TTOAA/EK 3 Sheets-Sheet 1 s. l. sHERR MILLING HEAD Dec. 19, 1950 Filed oct. so. 1947 Dec. 19, 1950 s. l. sHERR 2,534,882

MILLING HEAD Filed Oct. 50, 1947 3 Sheets-Sheet 2 Dec; 19, 195o s l. SHERR 2,534,882

MILLING HEAD Filed Oct. 30, 1947 3 SheetSFSheet 5 26 35 /13 JNVENToR.

| Sayaf f. Sheri 2'7 15 14 A from/Ex Patented Dec. 19, 1950 MILLING HEAD Y Sava I. Sherr, New York, N .,Y., assigner rto Samuel Briskman, New York', N. Y.

Application October 30, 1947, Serial No. 783,178

(Chao- 59) 4 Elaims.

My invention is an improvementJ in milling xtures and is particularly intended for use with machines having a gang of cutting elements to produce teeth in metal blanks adapted to serve as the blades of shears for severing cloth and the like along zigzag or serrated lines.

This invention is an improvement upon the fixture set forth in my prior copending applica tion Serial No. 681,257, for a patent on Machines for Manufacturing Toothed Blades, led July 3, 1946. That application discloses a milling fixture having the shape of a head with means for manually attaching to the face thereof a number of blade blanks in positions offset somewhat from radial lines extending outward from the center and slightly tilted crosswise; the blanks being secured to the head with one longitudinal edge projecting, and the head being rotatable to carry the blanks past a set of chisels having pointed triangular ends to cut teeth into the projecting edges of the blanks in such manner that the teeth are also pointed and triangular in shape, and are cut back with their flat lateral faces inclined to the opposite Wide flat sides of the blanks. The principal object of this improvement is to provide automatic means whereby the blanks can readily and more advantageously be mounted on the head and more quickly removed.

In its preferred form the head carries movable retainer members and connections for actuating said members into place to grip and hold the blade blanks during the milling operation and to release them instantly after the milling or cutting is finished. The insertion, removal and replacement of the blanks is thus easily and expeditiously accomplished and-rapid operation and a large output are obtained in this way. f'

. Another object is to provide means by which the connections for the retaining members are controlled by a iluid motive agent, so that through the instrumentality of a single valve the attendant may make all theadjustments necessary whenever blade blanks are to be mounted upon the head or liberated from the retainer members and taken off from the head.

Other objects and advantages are set forth in the ensuing description, and the distinguishing features are pointed out in the claims. But

the invention as illustrated and described hereinis not to be understood in a restricted or limited manner, and I reserve the right to make changes in details of structure, shape, size and arrangement of parts as fully as is consistent with the broad and general .meanings of the terms in which the appended claims are expressed.

2 On the drawings: Figure 1 is a front view of a millingxturenac;Vv cording to this invention.

Figure 2 is a top plan viewof one of*thelevelsl` for moving the retainer members to vopvzrative position.

Figure 3 is a longitudinal section throughtlie fixture and the fluid controlled means for am ating the retainer members. A

` vFigure 4 is an axial section through the head of the milling fixture, showing said members and actuating connections'on a larger scale.AY

Figure 5V is asection on line 5-5 of Figre 1" showing vone of the retainer members in release' position." l

Figure `6 is a front view of part of the h'ead showing one of the retainer Vmembersholdingv the blade'blank in place.

Figure '7 is a section on line 'l-f-'l of Figure 6;

and.

Figure 8 is a perspective view of a detail; The milling head is shown at'l, and it is-de-v signed to mount and carry the bladeblanks 2j extending out towards the rim thereof, with one longitudinal edgev of each'blank projecting out from the face ofthe head; The blanks are' not-- in radial positions, but are oset from the-axis of rotation or center of the vhead as'indicated-i'n` Figure 1. The retainers 3 are disposed in spaces` between 'sector-shaped"sections 4, which covej or radially extending edges. rlheserecesses have divergent sides, so that the retainer members therein have the form of wedges-- One side-of'- each member 3 engages a blade blankand holds it fast when the member 2 is-forced inward toward the center of the head.

The members -2 are pushed inward by mounted at the circumference of the head and. impelled in the opposite direction by a movable4 element suchas a control member or plunger-.6 at the middle of the head, with tongueshaving bevelled or cam edges that make contact with the inner extremities ofthe members 3. When the element ,6 is vcaused to protrude at its front` end from the head, the members 3 disengage the.- blanks 2, leaving them loose and ready to be; taken out. The part E has the shape of a ,trun-j cated cone at both inner and outer ends and is" levers 5 direction outward and inward with respect to the head I by a rod 8 extending out at the rear end of the head and united to a piston 9 in a pressure cylinder I0. The reciprocation of the piston causes the plunger 6 to move with it in both directions to lock or loosen the members 3. The plunger 6 is disposed in a central cavity II in the head I, and opening through the front thereof, deep enough to give the plunger 6 full range for the movement required.

The cooperating plungers 1 are disposed in radial bores I2 connecting the central cavity or recess II with the notches or recesses I3 at the circumference of the head I. The notches I3 extend from front to rear of the head. and in the front of the notches I3 are blocks or fittings I4 which are U-shaped or notched in the tops to receive the levers 5 and are provided with fulcrum pins I5, on which the levers 5 are pivoted.

The spaces between the cover sections 4 on the'face of the head I are indicated at I6. Along one edge these spaces have longitudinal shoulders that'are formed by rabbetting one side of each section 4, as illustrated at I1,` the shoulders being shown at I8. One long edge of each blade blank Z'lies against this shoulder in each of the recesses I6 when the blades are mounted in position on the head I, and the opposite edge projects out beyond the plane of the sections 4 to be worked by the gang cutters, not shown, but 'aflixed to a support so that the ends vshear through the blanks from one face to the other, the head and the blanks being fed slowly towards each other by relative movement of either or both so that the teeth are cut progressively as deep as necessary.v In one side of each retainer or locking member 3 are recesses I9' and in these'recesses or notches are leaf springs 2U with outturned ends at the front faces of said members. The blanks 2 are thrust into the recesses Iy against the seats provided for them by the shouldersIS and the sides of the sections 4, when the mem` bers 3 areA retracted, and are engaged by the clip springs 2U and held in their exact positions till the members 3 are impelled by their levers 5 into full retaining and holding relation. The rabbetted or seating surfaces I'I along the sides of the sections 4 are not perpendicular to the face of the head, but are inclined slightly; and so is the adjacent side of each member` 3; and the blade blanks are thus tilted or cantedcrosswise at the requiredangle which the teeth must make with thel opposite faces of the blanks '2. The springs are held fast by screws 2I.

The retaining members 3 are arrangedto slide in the spaces I6 between the levers 5 and the main plunger 6. They have slots 22V through which pass bolts 23 which are screwed into the head I. The slots 22 are enlarged at their outer ends to present shoulders 24 against which the heads of the screws abut to prevent the members I' from falling out of place. The screws and slots are covered by closures 25 attached to the' members 3 by small screws. The faces of the members 3 are recessed so as to present seats for the closures 25, thus permitting the latter to beflush with the surfaces of the members 3. 'I'he latter are engaged at their outerv extremities byknobs 2B on the ends of the levers 5, and the bearing blocks I4 carrying the pivot pins I5 for these levers are secured by screws 21 turned up into threaded bores in the bottoms of theA recasses I3 at the rim of the head I. These blocks 4 have concave recesses in the rear faces to give clearance to the outer end of the plungers 1.

The inner ends of the plungers 1 are tapered as indicated at 28. These plungers have hollow spaces 29 inside and carry in their tapered ends projecting pins 30. The pins have inside the plungers enlargements 3| on their inner ends which are engaged by spiral compression springs 32 in the spaces 29. These springs also press with their opposite ends upon screw plugs 33 which close the outer ends of the spaces 29. The plugs carry stems 34 which enter the plungers and serve as cores or guides for the springs 32. On the outer faces of the plugs 33 are nuts 35 which abut the knobs 26 on the other ends of the levers 5. The outer ends of the pins 39 may be bevelled and may have keyed engagement with the plungers 6 to prevent turning. The plungers 6 may also be keyed in the bores I2. The adjacent side of each block I4 has a concave face 36 to give clearance to the plungers 6.

In the power cylinder I0 the piston member 9, which acts through the shaft or spindle 8 to control the main plunger 6 and the cooperating plungers 1, is made fast to a rod 31 which projects out of the cylinder 9 and enters a stationary casing 38. On the end of the rod in the casing are two collars 39. The collars fit annular grooves 40, which have annular channels 4I in the bottoms thereof, in the casing 38. The rims of the collars or flanges 39 and the bottoms of the grooves are made smooth enough to make the collars or flanges 39` airtight therein. Of course the casing is constructed in any suitable. fashion and may include two or more hollow parts or sections which can be assembled and secured so as to envelope the flanges or collars 39. This casing is held'immovable by suitably mounting it in the operation of the fixture, while the head with the shaft 8, the pistonll and cylinder IU andthe rod 31. with the flanges or collars 39 can rotate freely.

Two inlet holes are tapped into the side of the casing 38, one in line with each of the channels or annular air ducts 4I. Into these holes are screwed nipples 42 to which are joined the pipes or conduits 43.' These pipes lead' to a valve casing 44, containing a four-way' valve 45. The pipes 43 are joined to the'casing 44 at diametrically opposite points. The valve rotates in the casing and is in the form of a round plug with oppositely located recesses 48-in itsexterlor. At a point equidis'tant from the ends of the pipes 43 at the casing, the latter is coupled to a pipe 41v connected to a source of compressed air or other motive agent, and directly opposite the end of the pipe 41 is an outlet or discharge pipe 48. In the rod 31 connected to the piston 9.are two ducts 35a and 39D, opening through ports in this Vrod to the inside ofthe cylinder I0. The duct or passage 39a connects the nteriorcf the cylinder at the right of the piston 9 to one of the channels 4I through one of the collars 40, and the duct 38o connects the opposite end of the cylinder through the other collar or ange 40 to the remaining annular duct or channel 4I. Hence by the rotation 'of the valve 45 the motive agent can be directed into the cylinder so as to cause the plunger 6 to project from the head I or to retract the plunger 8 into the head;

The cylinder has a threaded boss 49 which screws into a threaded` bore 50 in the end of a shaft or neck 5I which unites the headA I and the cylinder I 0. The neck is of suitable length and bears 'means for'connecting the head4 to a source of power to rotate the head. lAt the other end this neck also has a threaded boss 49 Awhich screws into a large porjection 52, at the rear of the head, and having a threaded bore to receive the last named boss 49. The threads on the `bosses 49 may be such that they are held tight by the direction of rotation of the fixture, or additional means to prevent the loosening or uncoupling of the parts I, and 5I may be utilized if needed.

The inner end of the plunger 5 comprises a disk 53 secured in place by screws 54. This disk or section has a central opening threaded to receive the inner extremity 55 of the shaft or rod 8. The threads will be so inclined as to prevent unscrewing in rotation, or additional locking means can -be employed. The plunger has two distinct conical surfaces; hence it tapers from about the middle towards the inner end and from a point a little farther forward to the front or outer end. The two sections are indicated by the numerals 55 and 51. The latter at the outer end has slots 58 to form bevelled or cam-shaped tongues or prongs 59 that make contact with the innei` ends of the retainer members 3.

At the front of the head the recess or bore II is enlarged to afford an annular shoulder 50 which gives a seat for a guide disk 6I. On the front face of this disk is a boss 52 at the center. The cover sections 4 overlap the rim of the disk 6I and the extremity of the boss 62 is about flush with the forward faces of these sections. The disk has slots 63 running inward from the rim towards the center, and these slots merge with shallower slots 54 in the periphery of the boss 62. Screws 65 and dowel pins 66 hold the guide disk in place.

When the blade blanks are mounted in the head, the valve 45 is rotated to direct iluid into cylinder 9 kthrough the passage 39a. The control plunger 6 is thus forced to protrude from the head I, so that the cam edges of the tongues 59 push the members 3 away from the axis. 'I'he blanks can then be inserted under the clips 26 into the spaces between the members 3 and the side of the sections 4, with their rear edges making contactl with the shouldered seats I8 and their ends resting against the `boss 62. These blanks are then in the same relative positions with respect to the axis of rotation of the head as they will be in the shears with respect to the axis of the pivot which unites the two halves of the shears together. The teeth are cut in the projecting longitudinal edge of each blank in the same way as in my application aforesaid. The blanks are held by rotation of the valve to the other position so that air can be directed into the cylinder through the duct 39h to draw the plunger 6 back; then the coned end 51 will force the cooperating plungers 1 outward in their bores I2 to rock the levers 5 and impel the members 3 inward so that one side of each clamps the blade blanks against the sections 4 vand holds them fast. When the plunger 6 again moves to protrude from the head, the blades are released and can be removed from the head to make way for the next stock to be worked.

The action of the head is thus quick and certain, because the blades can be readily inserted, cut and removed, and are securely held throughout the tooth-cutting operation.

Having described my invention, what I believe to be new is:

1. The combination of a rotatable milling head having parts presenting .fielongated `-seats open through the front face of the head, said seats extending from points adjacent the middle of the head outwards toward the rim thereof, the seats each having a shoulder at its inner end and a flat surface at one side inclined at other than a right angle to the plane ofv rotation of the head, movable retainers carriedby the head and yextending along said seats, each retainer being in operative relation to an adjacent seat and having its adjacent side parallel to said surface thereof, and means for actuating said retainers into and out of position to clamp a piece of stock against each of said surfaces, said seats each being offset from a radial position with respect to the axis of rotation of the head.

2. The combination of a rotatable milling head having parts presenting elongated seats open through the front face of the head, said seats extending from points adjacent the middle of the head outwards toward the rim thereof, the seats each having a shoulder at its inner end and a flat surface at one side inclined at other than a right angle to the plane of rotation of the head, movable retainers carried by the head and extending along said seats, each retainer being in operative relation to an adjacent seat and having its adjacent side parallel to said surface thereof, and means for actuating said retainers into and out of position to clamp a piece of stock against each of said surfaces, said seats each being offset from a radial position with respect to the axis of rotation of the head, said retainers being wedge-shaped and said head having spaces adjacent said seats receiving said retainers.

3. The combination of a rotatable milling head having parts presenting elongated seats open through the front face or" the head, said seats extending from points adjacent the middle of the head outwards toward the rim thereof, the seats each having a shoulder at its inner end and a flat surface at one side inclined at other than a right angle to the plane of rotation of the head, movable retainers carried by the head and extending along said seats, each retainer being in operative relation to an adjacent seat and having its adjacent side parallel to said surface thereof, and means for actuating said retainers into and out of position to clamp a piece of stock against each of said surfaces, said seats each being offset from a radial position with respect to the axis of rotation of the head, said means comprising levers mounted adjacent the rim of the head, each lever having one end engaging the outer end of one of said retainers, radially arranged plungers carried by the head, each having one end engaging the opposite end of one of said levers, and a control member in the middle of the head having a conical surface engaging the inner ends of said plungers to operate the latter, and a conical section inclined in the opposite direction to engage the inner ends of the retainers, the latter thus being movable to clamping and release positions by said levers, said plungers and said member.

4. The combination of a rotatable milling head having parts presenting elongated seats open through the front face of the head, said seats extending from points adjacent the middle of the head outwards toward the rim thereof, the seats each having a shoulder at its inner end and a flat surface at one side inclined at other than a right angle to the plane of rotation of the head, v

movable retainers carried by the head and extending along said seats, each retainer being in operative relation to an adjacent seat and hav- REFERENCES CITED ing its adjacent side parallel to said* Surface The following references are of record in the against each of said surfaces, said seats each 5 being offset from a radial position with respect Number Name Date to the axis of rotation of the head, said retainers 1,075,756 Bryant Oct. 14, 1913 carrying springs opposite` said surfaces.` FOREIGN PATENTS SAVA I. SHERR. 10 Number Country Date 221,455 Great Britain Sept. 11, 1924

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