US1846391A - Hydraulic feed for machine tool heads - Google Patents

Description

Feb. 23, 1932. GA E. HALLENBECK HYDRAULIC FEED FOR MACHlNE TOOL HEADS Original Filed June 215, 1926 3 Sheets-Sheet ffii...

INvEN-r lll" 5ml:

:Ely A T'TDRNEY Feb. 23, 1932. G. E. HALLENBECK HYDRULIC FEED'FOR MACHINE: TOOL HEADS s sheets-sheet y2 Original Filed June 23, 1926 INQVENTG Feb. 23, 1932. G E HALLENBECK 1,846,391

HYDRAULIC FEED FOR MACHINE TOOL HEADS Original Filed June 25, 1926 3 Sheets-Sheet 3 INVENTC] :E ATTDENEU.

Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE GEORGE E. HALLENBECK, OF TOLEDO, OHIO, ASSIGNOR TO BAKER BROTHERS, INC. OF TOLEDO, OHIO, A CORPORATION OF OHIO HYDRAULIC FEED FOR MACHINE TOOL HEADS Application led .Tune 23, 1926, Serial This invention relates to tools having adjustable holders.

This invention has utility when incorporated in multiple tools for hydraulic cycle of feeding for machine tools.

Referring to the drawings:

Fig. 1 is a side elevation, with parts broken away, of an embodiment of the invention in a drill press type of multiple tool having hydraulic shift for the tool holder or head toward and fromI the work;

Fig. 2 is a section through the head showing the driving connections for the auxiliary spindles from the main spindle, and on the line llI-II, Fig. 3;

Fig. 3 is a section on the line III-III, Fig. l;

Fig. 4 is a diagram of the speed rates on a time base in the cycle of operations as hydraulically operated in shifting the tools toward and from the work;

Fig. 5 is a view on an enlarged scale of the control valve as mounted on the side of the column of the drill press of Fig. 1;

Fig. 6 is a section on the line VI--VI, Fig. 5;

Fig. 7 is a fragmentary section on the line 'VH-VIL Fig. l; and

8 is a section on the line VIII-VIII,

Driving belt 1 as operated may rotate pulley 2 on shaft 3 mounted in bearings 4, 5, carried by column 6 upstanding from base 7. Bearing 5 is in overhang 8 from the column 6, which column 6 is provided on the side thereof toward the overhang 8 with a pair of parallel guides 9. The base 7 extends under the overhang 8, and there is disposed thereon work table 10 opposing housing 11 having slide portions 12, 13, coacting with the guides 9 of the column.

The main drive shaft 3, adjacent its bearing 5, is provided with bevel gear 14 in mesh with bevel gear 15 having spline connection i6 with main spindle 17 mounted in bearings 18, 19, of the overhang 8 and bearings 20, 21 of the housing l1. Fixed with this main spindle 17 in the housing l1 is long toothed gear 22 in mesh with gears 23, 24, in one plane, and gears 25, 26, 27, in an adjacent low- No. 118,044. Renewed :rune 15, 1931.

er plane (Figs. 2, 3). These gears 23, 26, 24, 27, 25, are in an annular series and as to charging station 28 are equally spaced 60 apart to provide rotational driving means for auxiliary spindles 29 supported respectively by sleeves 30 mounted in bearings 31 of the housing l1. These sleeves 30 permit the respective auxiliary spindles 29 to rotate relatively thereto. However these respective sleeves 30, each as keyed against e0 rotation relatively to bearings 31, are provided with racks 32 having pinions 33 in mesh therewith. These pinions 33 are mounted on shafts 34, 35, 36, 37, 38. 'Each of these shafts carries a worm wheel 39 in mesh with a worm 40. The worm 40 for the shaft 36 is fixedly mounted on actuator shaft 41 having hand wheel 42. For the parallel shafts 34, 35, the worms 40 are loosely7 mounted on actuator shaft 43 having hand wheel 44. This actuator shaft 43 is-aXially reciprocable to shift jaw clutch member 45 into driving engagement with the worm 40 for the shaft 35 or for the worm 40 for the shaft 34. Accordingly, the axial shifting of the auxiliary spindles 29 may be effected independently for adjusting such toward or from the work table 10 or into or out of the housing 11.

Actuator shaft 46 has loosely mounted thereon the worms 40 coacting with the worm wheels 39 on` the respective shafts 37, 38. By operating hand wheel 47, this actuator shaft 46 may be rotated. This actuator shaft 46 has fixed therewith clutch member 48 which by axial shifting of this actuator shaft 46, may be thrown into driving engagement with either of the worms 40 thereon for thereby effecting the desired adjustment for the auX- iliary spindles as connected to the shaft 37 or connected to the shaft 38. These spindles 29 terminate in tool holders 49 in lwhich .may be mounted tools 50 of similar or different characters may he desired in the handling of Work as to whether the operations are to be simultaneously performed on the same article or Whether each operates as a different tool on a scriesfof articles which may be shifted to the positions for the differenti tools on the table l0 wiith the'blank position leo .28 for clamping in and removing the articles of work in such cycle of operations.

Hydraulic control 52 about pulley 53 on shaft 54 carried by -member 67.

circulator or pump housing 55.

Cam group 56 fixed with the housing 11- has port-ion 57 coacting with roller 58 on arm 59 of angle lever having fixed bearing 60 (Figs. 1, 5). This angle lever has, at an angle to the arm 59, arm 61 terminating in dog 62. Plunger 63 operated by spring 64 normally swings this angle lever 61, 59, to hold the roller 58 toward the cam 56. As the roller 58 in the descent of the housing 11 reaches cam portion 65, the angle lever 59. 61, is rocked to throw the dog 62 out of seat 66 in member 67. This member 67 has a slide. carrying pin 68 engaged by fork arm 69 of lever having fixed fulcrum 70 and upwardly extending arm 71 engaged by tension helical spring 72 having adjustable connection 73 with plate'74 fixed with the column 6, with which plate 74 is mounted valve 75 into which control rod 76 extends from the slide member 67. This shifting of t-he dog 62. as a detent from the seat 66, allows the spring 72 quickly to throw the slide member 67 to bring the detent 62 into seat 77 thus shifting the valvel stem 76 and effecting shift from fast descent travel portion 77 (Fig. 4) to Slow working travel portion 78 effected by the circulator pump controlled from this valve 75.

The roller 58 now rides upon cam portion 79 and as it reaches cam portion 80, there is again rocking of this angle lever 59, 61, to shift the detent 62 from the seat 77 to seat 81 which is effective to reverse the direction of liquid circulation from the circulator 55 and athigh speed rate to effect travel as indicated by curve portion 82 (Fig. 4). The 'plunger 63 actuated by spring 64 holds the detent 62 in its seat relations with the slide This reversal of the circulation travel causes the housing 11 to ascend and cam 83 carried thereby contacts terminus 67 and is thus effective to push the slide member 67 against the action of the spring 72 for thrusting the valve control rod 76 into 'l the housing 75 cutting ofi1 circulationeHecy tlveness from the circulator 55 thus brznglng the housing 11 to a stop as shown by currve portion 84 (Fig. 4). v

Liquid flow circulation from the pump 55 as controlled by the `valve 75 is effective in operating the housing 11 in this cycle descent and ascent through supply of such incompressible medium by way of pipe 85 having branches 86,87, to cylinders 88 mounted on the base 7 to the lower side of pistons 89 therein having piston rods 90 upwardly extending therefrom which have adjustable connection 91 with the housing 11 shown outwardly and forwardly from the guides 9 and parallel with such guides.

From the circulator housing 55 in addition to the pipe 85, is pipe 92 having branches 93, 94, to the upper portions of the respective cylinders 88 above the pistons 89. Accordj ingly, in the control of the circulatory fiow in this closed liquid circuit, there may be the positive operation of this tool carrier housing 11 in its travel rapidly into position adjacent the work then' at a slower'feed rate in its working operation, automatically followed by the quick recover clear of the work for a repetition of the cycle of operations.

To effect repetition of the cycle of operations, the operator depresses pedal 95 mounted on fixed fulcrum 96 carried bv the base 7 Fixed with this pedal 95 is upwardly extending arm 97 having adjustable link 98 extending rearwardly therefrom to arm 99 of`angle lever mounted fixed bracket 100 carried by the base 7. Fixed withthis arm 99, and at an angle thereto, is arm 101 from which eX- tendsl link 102 to arm 103 mounted on the fulcrum bearing and lixed withthe lever 69, 71. Accordingly, depressing the pedal 95 places tension on the spring 72 and effects rocking of the levers 71. 69, to throw the slide member and thus shift the valve control rod 76 back into the valve 75 to allow the detent 62 to drop into seat 66 on the slide thus connecting the circulator 55 for operation in curve starting portion 104 (Fig. 4) with the housing 11 descending at a rapid feed rate as shown by curve portion 77 (Fig. 4) in a repetition of this cycle of operation.

Driving belt 1 may be controlled for intermittent or continuous driving, as desired. Herein the circulator is shown as continuously operating with the valve determining the direction ot the hydraulic circuits and flow rates as to the cylinder 88. The drive for the main spindle 17 and the respective auxiliary sprindles 29may be for continuous rotation. The adjustments of the tools relatively tothe work may be effected through the various hand wheels 44, 42, 47, selectively as the wear of the tool or the position .of the work may require. AThe speed reduction worm gearing has such an angle of friction as is effective for automatically holding the one side, and that forwardly of the guide.

This means that there is no period when there may he a loose critical or balanced condition with lost motion which may tend to disturb the accuracy of work handling. Furthermore, this pulling action is with the piston rods 90 under tension. This means that a smoothness of travel is insured at all times because of the avoidance of binding tendencies or vibration along the guide.

The circulator herein disclosed is of the genim; eral type of pump and mechanism shown in Patent No. 1,458,595, Ferris, October 26, 1922. What is claimed andit is desired to secure by United States Letters Patent is A machine tool comprising a frame, a verti- 115 cal guideway on the upper portion of said frame, a tool head slidable on said guideway and supporting tool spindle means in front of said guideway, a Work table at the base of said frame beneath the tool head, feeding Q0 means for said tool head com rising a pair ci cylinders at the base of sai frame, one at each side of said table, pistons in said cylinders and connected to the tool heady to successively pull the same toward the table and Q5 push the same to its' elevated position, said pistons being connected to said tool head at points in front of said guideway to neutralize the feeding stresses on said head, a liuid pump, a valve for changing the direction and 30 rate of flow from said pump to said cylinders and a control devicey for said valve.

ln witness whereof I aiiix `my signature. GEO. E. HALLENBEGK.

Images