US938304A

US938304A - Gear-cutting machine.

Info

Publication number: US938304A
Application number: US45229608A
Authority: US
Inventors: Thomas C Dill
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-09-16
Filing date: 1908-09-16
Publication date: 1909-10-26
Anticipated expiration: 1926-10-26

Description

GEAR CUTTING MACHINE.

APPLIOATION FILED SEPT. 16, 1908.

Patented 001;. 26, 1909.

2 SHEETS-SHEET 1.

T. C. DILL.

GEAR CUTTING MACHINE.

APPLICATION FILED SEPT.16,1908.

Patented 0011.26, 1909.

{SHEETS-SHEET 2.

, sa T my o'rnfn :2 he i il .4, A. n M.

GEillfiCU'ITING MACHINE.

npplicasion filed September 1s, 13%. Serial Ho. 253,5296.

To all whom it may concern: 1

Be it known that l, Tnoims C. DELL, n eilizen ol' the United States, residing in Philadelphia, Pennsylvania, have imrenled.

forms of slotters whereby these latter may be rendered available for use in cult-in gear teeth, etc, it being especially desired that the device shall be relatively inexpensive 8.5 well es uncomplicated and subrtentiel.

T e objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which Figure l, is i. side elevation of the nutchine constructed according to my invention:-Fig. 2, is side elevation on an enlarg'ed scale, illustrating certain of the de tail features of the tool-carrying heed Fig. 3, is a vertical section oi the cutting l'ool employed in connection with my invention, and illustrating it as an-acting wi'lh a master gear in order that it shall properly operate upon blank to be cut; Fig, 4-, is a plan,

partly in horizon'nl section, taken on the line +l:*i, Fig. 3; Fig. 5, is n perspective view of the tool post; Fig. 6, is :1 perspcelive view of the cum structure employed as phrt of my invention; Fig: 7, a vertical section on the line 7-7, Fig. 4, and Figs. 8 and f) are respectively a side elevation pnrlly in section, and n fragmentary plan illuslruting 1 modified form oi my invention.

In the nhove drawings A represents the base or main slrucllure oi 21 slolter which is conslruclion Patent No. 776,501, dated December 6, i904.

preferably though not necessarily oi. the

described and claimed in my This pm'licular machine is provided with a horizontally adjustable head B upon which is mounted the reciprocuble tool-carrying ram C, while in addition said base is pro vid cd with 2. work simportiug lZllJlG D which is not only horizoncnlly ndjustnhle in two directions at right angles to each other huh also rotatable about n-verticn'l axis.

1 have not illustrated the detail mechanisms for operating the rain or the work supporting table, inasmuch as these are well ltuownio the art and in tliemselves iorni no part of my present invenlion.

in the present instance the ram C, as shown inl igs. 1 and 2, has rigidly held to it by means oi clnn'ips c a. vertically mounted tool post E, which is tubule. and enlarged at its lower end; it being split or' vertically slotted at c as shown in l igs. 3 and 5. Forther, it is provided with a plane portion 0 which is designed to fit against the flat face of the rain C so the; when it finally clamped in position it can by no possibilityhzive any turning movement. Extending through this post is a tool spindle l! en-- htrged at the lower end and having connected to it by a nut f :1 cutting tool f made to have the general outline of a gear and provided with teeth of such number and dimension as may be required by the work to.

be performed Said spindle is held to the post by ncnns of :1 nut or nuts 1 Eli. its no per end, and while tlree to i'urn in the tool p'osl, niny be clamped by means of e bolt 7 so as to be rigidly connected thereto. This hitteextends through the enlarged lower end 0" of the tool post, and I provide means whereby the slotted portions oi lhe lower end of this post may be drawn together to grip the s niulle l to prevent it from turnlug. For this purpose ll employ in the presenl; instance a collar G mounted upon the bolt f and having in its face adjacent to the face of the end e n series of holes r concenll'lc with said boll-f. v

The outer face of the collar G is provided with n plurality of coins g and there is mounted upon the bolt 7'" an arm ll having on its hub a number of Inojocliions 7L dc lflil0l to co-act with the inclined coin feces y on the collar G. As shown in l" ig. 4-, the

bolt 7" has a head between which and the enlarged end e of the tool post the hub of the arm H and the collar G are confined, and is moreover provided at its opposite end with 21 pair of nuts 7" whereby it may be held in any adjusted position to the tool post. The arm H is of such it length that it is capable of engagement with estructure K mounted upon the stationary portion of heed B of the slotter. This structure, shown in 7, is provided with a longitudinally movable latch bolt is normally held outward by a spring is to a distance determined by a pin 70 The end of said latch bolt 70 is par- 5 tially cut away and is curved to co-act with the curved end k of the arm H so that when said arm is moved upwardly, its curved end strikes the similarly curved end of the latch bolt is and causes this to move longitudinally without being itself caused to turn on the '20 or'disk L in which it is desired to cut gear teeth, or other forms, while immediately above and concentric with it I mount a master gear M. The ram of the slotter is now caused to be vertically reciprocated by the operation of the well known mechanism and the work table D is fed toward the cutting tool f; the stroke of the ram being so adjusted that the said tool at the upper end 01' its stroke meshes with the teeth of the master gear, and at the lowerend thereof pauses below the blank operated on. The tool therefore begins a cut in the blank immediately under and in line with a space between two adjacent teeth of the master gear. I next start the mechanism for rotating the work table so that this latter is given a fraction of a turn while the tool is in engagement with the teeth of the master gear, and in order that said tool may be free to turn when the master gear is thus turned, and yet may be rigidly held while making a cutin the blank, I so adjust the bolt f and its co-acting parts 6 Grand H- that when the arm H is in the position shown in Fig. 2, the projections h on the hub thereof are at the tops or highest portion of the cam faces g on the col ar G, with the result that these two parts act upon the bolt f to cause it to draw together the two halvesof the slotted end portion of the tool post vE, thereby makin it grip and rigidly hold the spindle F wit the" tool f. As a consequence, said tool cannot turn during the downward stroke of the ram C.

Toward the end of the upward movement of the ram, the arm H first strikes the latch bolt and moves it longitudinally against the action of the-spring is as above do I scribed, and then engages the overhanging 6 part of, the structure K, so that it is moved to bring its projections 71, opposite the low portions of the cam'faces g and therebypermits the two halves of the lower end of the tool post E to spring apart thusreleas- 6 the tool spindle F. The subsequent partial turning of the master gear M then gives a partial revolution to the tool and its spindle, which is' immediately thereafter again clamped to the tool post by the engagement of the arm H with the end of the latch bolt 7 73 at the beginning of the downward stroke of the ram. The partial turning of the master gear with. the blank thus brings successive uncut portions of said blank under the tool and. the above described series of operations is repeated until one complete revolution of the work table has been made. This latter is then fed toward the tool so as to permit the teeth of the cutter f to more deeply engage with the teeth of the master g gear:-the operation being repeated, after 7 each revolution of said gear .until finally teeth are cut in the blank in exact correspondence with those of the master gear M.

As is customary in some forms of slotting 35 machines, the ram C has a rodc pivoted to its upper portion and frictionally engaging a bearing in a standard 0 which is fixed to the head B of the slotter. In addition, the tool-carrying portion of the ram is pivoted to the main part thereof so that it is turned on its pivot throughout its upward stroke into sucha position that the cutting tool will clear the work operated on. Immediately upon the beginnin of the downward stroke this pivoted hea is restored to its normal position in which it remains during the remainder of the out. In Figs. 8 and 9 I have illustrated a modified form of my invention, in which in place of a master gear or form mounted concentrically with the blank to be cut or otherwise carried on the rotary work table, I have provided a guide'form R mounted on a spindle F concentric with the cuttin tool '7. The arrangement is such that t is guide form It at all times remains in engagement -with the partially cut teeth of the blank or at least is in such engagement while the cut,- ting tool does not engage the blank. The construction of said guide form is such that its tooth shaped projections .r transmit movement from the rotary work supporting table to the toothed spindle and tool when this latter is out of engagement with the blank, so that, as before, the tool is free to be turned while it is at the upper end of its stroke out of engagement with the blank, and is immediately thereafter rigidly clamped before it begins its out. It will be understood that the tooth shaped projections '1' are so shaped and of such dimensions as to transmit the proper amount of movement to the tool and thereby cause it to properly cut teeth of the desired character and dimensions on the blank. I claim:

1. A cutting machine consisting of a table for the support of a blank, a master form, a tool head, and a cutting tool for operating on the blank carried by said table, with tary work table for supporting a blank, a master fornnand a reciprocable slotting head having a cutting tool placed to be guided by the master form and arranged to alternately engage said form and the blank.

4. A cutting machine consisting of a work table for supporting a blank and having a master form mounted on it, areciprocable slotting head having a cutting-tool'arranged to alternately engage the master form and the blank, with means capable of permitting rotation of the tool while it is engaged with the master form, and preventing such rotation while it is operating on the blank.

ing a reci'procable head, a multiple point tool carried thereon, means for automatically clamping and releasing said tool to prevent its rotation at certain-parts of its stroke and to permit it at others, with a work table for carrying a blank, and a master form meshing with the points of the tool. 6. The combination in a cutting machine of a table for supporting a blank to be cut, a master form having means for supporting it concentrically with the blank, a reciprocable head, a tool spindle movably mounted thereon, a tool on said spindle capable of being guided by the master form, and

means for periodically clamping said tool" spiudle to prevent. movement of the tool, the same including an arm on the reciprocable head and a projection on the fixed portion of the machine placed to periodically-engage said arm.

7. The combination in a cutting machine of a work table for supporting a blank, a master form, a reciprocable head having a tubular tool post, arevolublc spindle in said.

5. The combination with a machine hay-- tool post having a cutting tool capable of being guided from the master form, means for clamping the tool post to the tool spindle,-

the same including a bolt, a cam structure thereon,- an arm having a portion co-aoting with the cam structure, and a projection mounted on the frame of. the machine so as to periodically engage the arm to operate the cam.

8. The combination in a cutting machine of a'work supporting table having a master form, a reciprocable head having a cutting tool arranged to co-aet with, said form, means forperiodically clamping and releasing said-tool to permit'ot its movement, the

same including a cam structure, an arm co-;

operating with the cam structure to operate the clamping means, and a device mounted upon the frame of the machine so as to cooperate with said arm, said device having a spring pressed latch arranged to cause turning of the arm when the latter is moved in one' direction and capable of yielding without causing turning of the arm when the latter is moved in an opposite direction.

9. The combination in a gear cutting machine of a rotary work supporting table having means for holding a blank, a master gear mounted on the table concentric With the blank, a reciprocable head having fixed to it a tubular tool post, a spindle revolubly mounted in said tool post, and having a gear shaped cutting tool at its lower end capable of meshing with the teeth of the master ear, the lower end of the tool post being slotted and having a transverse bolt, a cam structure and an arm mounted on said bolt, said arm having portions cooperating with said cam structure, with a device mounted upon the frame of the machine for periodically engaging and turning said arm to cooperate with the cam.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribingwitnesses.

THOMAS C. DILL.

\Vitnesses:

/VILLIAM E. BRADLEY, Jos. H. KmnN.