US1717385A - Controlling device for machine tools, particularly grinding machines - Google Patents

Description

June 18, I929. JUNG I 1,717,385 CONTROLLING DEVICE FOR MACHINE TO OL5,' PARTICULARLY GRINDING MACHINES Filed April 27, I92? 2 Sheets-Sheet l.

I nv-enior June 18, 1 929. K, J N'G 1,717,385

A CONTROLLING DEVICE FOR MACHINE TOOLS, PARTiCULARLYGRINDING MACHINES Filed April 2'7, 192? 2 Sheets-Sheet 2 IIIIIIIIIIIIIIIIIII/IIIIIIIIA VAVA i V///////// II-m I In venfoz':

Patented June 18, 1929.

PATENT OFFICE.

KARL JUNG, or BERLIN, GERMANY.

. CONTROLLING DEVICE FOR MACHINE TOOLS, PARTICULARLY GRINDING MACHINES.

Application filed April 27, 1927,-S;erial No; 187,028, and in Germany September 18, 1926.

In machine tools, in which a movement is imparted in' a longitudinal and transverse direction to a sliding carriage serving for the securement of the work-piece or tool,

hitherto the parts effecting this movement have been driven as a rule by the driving or transmission shaft by the intercalation of suitable gear devices or couplings. The reversing operation at the end of the travel in this event takes place preferably by means of a stop, adjustably secured to the slidlng carriage, which strikes against a control lever, residing in communication with the controlling device, and shifts the same. In

this arrangement the active force of the sliding carriageat the end of the travel is not sufficient to perform the reversing operation,

so that special spring devices or the like have to be provided, in which, upon movement of the sliding carriage, excess force serving to effect the reversing operation ,is accumulated. K

The present invention dispenses with these unreli'ably operatin spring devices in that 2 the longitudinal slide at the end ofits travel puts into circuit a special, prefer: ably hydraulic, source of power, which then in turn effects the reversing operation of the longitudinal travel and in given cases may also setinto operation the transverse travel.

The operation of the longitudinal travel according to the invention takes place hydraulically and preferably by means of two dis sociated pressure' 'pistons to which the pressure fluid is conducted through a common pump,. while a special pump is provided as --the source of power for the control of the transverse travel and for the eflectuation of the reversing operation. The accompanying drawing illustrates an "example of an embodiment of the invention for a grinding machine in which Fig. 1 is a side view of the machine partly in section, 46 Fig. 2 is a front viewfpartly in section, the upper part of the frame being'broken away, h

Fig. 3 is a section through Fig. 2 on the direction "of the line 3-3, Fig. '4 is a vertical sectionthrough the housing of the controlling apparatus, while Figs. 5 and 6,illustrate longitudinal sections through; Fig. 4 in the direction of the lines 5- and 6-6 respectively.

Fig. 7 illustrates a section through Fig. 5 along the line 7-7 and h Fig. 8 a partsection through Fig. 7 along the line 8- 8.

In the drawing 1 is the housing of the controlling apparatus which is located in suitable manner in the grinding machine and upon which the slides 50, 51 carrying the work-piece are moved along. The tool 53 is rotatably mounted in the frame 54 of the machine. In the housing (Fig. 5) 1 are located two pumps of suitable construction, preferably toothed wheel pumps 2 and 3, which are set into rotation from a driving shaft 6 by means of a worm 4 and worm wheel 5. The pressure medium, for example oil or the like, drawn up by the pumps 2 and 3 gains access to the pressure leads 7 and 8 respectively. The pressure lead 8 leads to a passage 9 in the housing 1 (see Fig. 6) which discharges into an inlet opening 10 located in a cylindrical sleeve 11 in a passage in the housipgl. lVithin the sleeve slide two rigidly connected regulating pistons 13 and 14, having a central pgvalve 12,. which controls the inflow or outflow of the pressure fluid to two channels 15 and 16 in communication with a cylindrical chamber 1.7 as well as two outflow openings 22 and 23. Through the nected with the sleeve 11 by means of two channels 49 and 49.

The shaft 26 at its outer endprojecting outside the housing 1 carries the outer end of a lever 27 which extends into the path of two adj ustble stops fixed in a known manner 'to the longitudinal sliding carriage '51, not

shown on the drawing, oris in communication with a stop lever located in the path of the stops.

The shaft 18 led through the cylinder 17 extends on the one hand into a recess 28 of the housing 1 for the reception of known driving means for the travel of the sliding carriage 50 in transverse direction, containing for example a ratchet drive 55, and forms on the end projecting through the cover 21 a pin 29 upon which an eccentric disc 30 is rigidly mounted. Surrounding the eccentric disc 30 is located the ring-shaped formed end 31 of a lever 32, which at the other end is articulated to the free end of a swinging lever 34 secured to a swinging shaft 33. The swingin g shaft 33 is rotatably mounted in the housing 1 and carries a second swinging lever 35 to which is linked a link 36 which on the other hand is articulated to a regulating piston 37. The regulating piston 37 is in communication with two further regulating pistons 38 and 39 and slides together with these in a sleeve 40 located in the housing 1 which presents a central inlet opening 41 as well as two channels 42 and 43 located in the housing 11 communicating with openings 44 and 45.

Apart from this two further outlet openings 46 and 47 are provided in the sleeve 40. The channels 42 and 43 each lead by means of pipe lines 56, 57 to separate pressure cylinders 58, 59 of which the pistons60, 61 operates the longitudinal travel of the sliding carriage 51 in one or the other direction, The inlet opening 41 is in communication with a channel 48 to which is conducted the pressure fluid through the pressure lead 7 of the toothed wheel pump 2-.

The operation of the apparatus is as fol- Through the pump 2 is supplied pressure fluid, drawn from a reservoir or flowing by gravity, through the pressure lead 7 and the channel 48 into the cylinder sleeve40 and, in the position of the regulatingpiston shown in Fig; 2 in the drawing, flows through the opening 44 into the'channel 42 and the pressure cylinder 59" in communication therewith of whleh the piston 61 is operated and moves the longitudinal slide 51 of the machine.

As soon as the slide comes near the end of its travel ajstop fixed thereupon strikes against the lever 27 or a stop lever in communication therewith and swings it laterally,

whereby this movement is transmitted through the shaft 26 to the swinging lever 25.

Consequently the regulating pistons 13 and 14 shown in a central position in the drawing are moved for example upwardly together with the valve 12 so that the pressure fluid supplied through the pump 3 flows from the channel 9 through the opening 10 and the channel 16 into the cylindrical chamber 17 and sets the piston 19 into rotation, whereby -'-the fluid located at the other side of the piston 19 escapes through the channel 15 into the cylinder sleeve 11, and flows freely through the outflow opening-22. As the piston 19 is the outermost position the fluid also espesthrough the channel 49, thereby discharging? the piston on both sides. By the rotation of the piston 19 the shaft 18 is also rotated about the same angle and operates the controlling device 55 for the transverse travel not fully shown in the drawing in the usual known manner. Simultaneously the eccentric disc 30 fixed to the end pin 29 of the shaft 18 rotates and effects a downward,

movement of the eccentric lever 32 which has as a result a rotation of the swinging levers 34 and 35 about the axis of the shaft 33. I

The downward movement of the free end of the lever 35 thus eifected and the lever 36 linked thereto effects a movement of the regulating pistons 37, 38 and 39 downwards, upon which on the one hand the flow of fluid from the channel 41 into the channel 42 is curtailed and brought ,into communicationv with the outlet opening-47' and on the other hand the channel 43 hitherto in communication with the outlet opening 46 is connected to the channel 41. There is thus efi'ected a reversing of'the longitudinal travel of the sliding carriage 51, so that the sliding carriage is moved in the opposite direction by the piston of the pressure cylinder 58 in communication with the channel 43, until the stop provided strikes against the lever 27 at the end of the travel whereupon the entire procedure is repeated in the opposite direction.

The invention is of course not limited to the embodiment illustrated, the arrangement,

certained the nature of my said invention and in what manner the same is to be performed, I declare, that what I claim is 1'; Acontrollin device for machine tools, particularly grin ing machines comprising, in combination with a sliding carriage, 11ydraulic means for moving said carriage to and fro, a separate hydraulic source of power independent of said means controlled by said carriage at the end of its travel and means energized by said source of power and reversing the travel of the carriage.

2. A controllin device for machine tools,

particularly grinding machines, comprising,

in combination with a longitudinal sliding carriage and a transverse carriage, hydraulic means for moving said longitudinal carriage to and fro, a separate hydraulic source of power independent of said means controlled by the said longitudinalcarriage at the end of its travel, means for effecting the travel of the transverse carriage and means energized by sieid source of power and being adapted to effect, reverse of the travel of the said longitudinal carriage and simultaneously to operatejsaid means for effecting the travel of 5 the tzl'ansverse carriage.

- A controlling device for machine tools,

particularly grinding machines, comprising,

in combination with a sliding carriage, two hydraulically operated cylinders one for the of said carriage, a common pump supplying pressure fluid to both cylinders," a separate hydraulic source of power controlled by said carriage at the end of its travel and means energiz'edby. said source of power and reversing the travel of the carriage.

4. A controllin device for machine tools, partic {larly grinding machines, comprising, in combination with a longitudinal sliding 20 carriage, hydraulic means for moving said longltudlnal carr age to and fro, a separate in combination with a sliding carriage, means for moving said carriage to and ho, a sepa-,

rate hydraulic source of power independent forward and one for the backward movement of said means controlled by said carriage attheend of its travel a cylinder, the one or the other side of WlllCll being opened to the flow of the pressure fluid delivered by said hydraulic source of powerunder the control of said longitudinal carriage at the end of its travel, a rotating piston within said cyl- 1 inder operated by said pressure fluid and adapted to control the reverse of the travel of said longitudinal carriage.

6. A controlling device for machine tools, particularly grin ing machines comprising, in combination with a longitudinal sliding carriage and a transverse carriage, means for -mov1ng-sa1d longltudlnal carriage to and fro,

a separate hydraulic source of power independent of said means, a cylinder, the one or the other side of which bein opened to delivered by the flow of the pressure fluid said hydraulic source of powerunder the control of said longitudinal carriage at the end of its travel, a rotatingpiston within said cylinder operated by said pressure fluid means for eflecting the travel of said transverse carriage, said piston being adapted to effect the reverse of the travel of the said longitudinal carriage and simultaneously to operate said means for effecting the travel of the transverse carriage.

In testimony whereof I have aflixed my signature.

KARL mm.

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