Патент USA US3040695код для вставки
June 26, 1962 H. HJRIDLEY 3,040,685 WORK-HANDLING MEANS FOR POWER-PRESSES AND LIKE MACHINES Filed Nov. 17, 1958 2 Sheets-Sheet 1 June 26, 1962 H. H. RIDLEY 3,040,685 WORK-HANDLING MEANS FOR POWER-PRESSES AND LIKE MACHINES Filed Nov. 17, 1958 r I 2 Sheets-Sheet 2 % @WM J United States Patent 0 ” ice 3,64%,685 Patented June 26, 1962 R. 2 3,043} 685 ‘slots 12. The upper end of the arm is pivotally con nected to the free end of a lever 16 which is pivoted at its other end about a stationary axis ‘17. About the WORK-HANDLING MEAIQTS FOR POWER-PRES§E§ AND LEE MACHINES Harry Heywood Ridley, Aldridge, near Walsall, England, assignor, by mesne assignments, to Sahlin Export and Trading Company, a corporation of Michigan Filed Nov. 17, 1958, Ser. No. 774,185‘ 11 Claims. (Cl. 113-50) middle of its length the lever has an integral depending lug '18 to which is pivotally connected by a pin 19 the free end of the piston-rod of a substantially vertical air cyl inder 20 mounted to rock about a ?xed pivot Z1 at its upper end; To provide the necessary rigidity the upper part of This invention relates to work-handling means for 10 the arm 14 is conveniently bifurcated, as shown in FIG URE 2, with parallel limbs'?tting between the plates 11, power presses and like machines and more particularly and’ the rollers 15' are carried on the ends of a spindle to means for unloading workpieces from such machines. mounted in a tube 22' extending between and welded to According to my invention, work-handling means for the limbs of the fork. The lever 16 is, also bifurcated power presses or like machines comprises a rigid sub stantially vertical arm carrying work-gripping means at 15 and is pivoted on a transverse pin mounted in-bosses 23 welded to the inner faces of the plates 11. its lower end mounted to swing about a point inter~ The arm 14 is telescopic, the lower part being adapted mediate its ends on a pivot guided for movement along to telescope into the upper part so that the effective length a ?xed path, a lever mounted for angular movement of the arm can be varied to suit different presses. about a ?xed point and connected at one end to the upper end of the arm, and ?uid pressure means for 20 A lug 25" pivotally mounted on the lower end of the arm'1‘4 has secured in it a substantially. horizontal bar 26. moving the lever angularly to cause the arm to move A sleeve 27 ?xed on the bar carries a double-acting air vertically and to swing about its pivot. cylinder 28 of which the piston-rod is'adapted to advance The gripping means is operated in synchronism with and close a gripper assembly 29 when the cylinder is the movement of the arm, the arrangement for unload ing or removing pressings from a power press being such 25 energised. The form of the gripper jaws will depend on the work to be handled. ' that the gripping means is advanced to grip a pressing, Air under pressure is delivered through flexible hoses the arm is raised through a small distance to lift the to the air cylinders Ztland 28 under the control of a valve pressing, and the arm is then swung out to carry the press or valves by which the operation of the work-handling ing to a point where it is discharged by release of the gripping means, the arm then returning to its initial 30 means is synchronised with that of the press. In the normal position of the arm 14- as shown in the position. drawings, the rollers 115 lie at the lower ends of the slots The work-handling means may be set in motion auto 11 and the lever 16 is inclined downwardly at a small matically by the closing of a switch actuated either angle to the horizontal from its pivot to the connection directly or through any convenient intermediate mech anism by a cam on the crankshaft of the press or by a 35 to the arm.’ In the operation of unloading or removing pressings striker or the like on the ram or slide, the switch being from the press, the air cylinder 28 'is energised to advance closed after the crankshaft has passed bottom dead the gripper assembly and close it on to: a ?nished pressing centre. as’ soon as the tools have completed their operation and A second switch is closed by a moving part of the work-handling means as the arm approaches the upper 40 the moving tool has moved upwardly far enough to per mit ‘the entry of the gripper. Then after a predetermined end of its movement to release the gripping means and allow the arm to return. A control actuated by a part of the gripping means may be provided to stop the press if the gripping means is not fully retracted when an time delay the air cylinder 20 is energised and swings the lever‘16 upwardly about its pivot 17, and the angular and upward movement imparted to the arm in combina appropriate point in the cycle of operations is reached. 45 tion with the curvature of the lower end of the slots 11 Preferably the arm of the work-handling means is produces a movement of the arm such that its lower end carrying the gripping means is ?rst raised substantially ver telescopic to allow its length to be adjusted to suit dif tically through a small distance and then is swung out~ ferent presses, and it carries at its lower end gripping ‘wardly away from the press to carry the pressing out means movable in a substantially horizontal direction and incorporating ?xed and movable jaws between which the 50 wardly away from the tools to a point where it is released. The path of the gripping device is shown by the lines work is held. 31, 32 in FIGURE 3, the line 31 showing its path when A practical form of work-handling means in accord the telescopic arm is at its shortest length and the hori ance with my invention for unloading work-pieces from a zontal movement of the gripper device is at its minimum. power press is illustrated by way of example in the The line 32 shows the path when these are at their 55 accompanying drawings in which: maximum. In each case the pick-up point is indicated at FIGURE 1 is a side elevation of the complete work 33 and it will be seen that there is a short substantially vertical movement of the arm to‘ lift the pressing clear of the bottom tools before the arm begins to swing out. FIGURE 3 is a diagram showing the path of the arm, The dotted lines in FIGURE ‘1 show the limiting upper FIGURE 4 is a diagram of the electrical control system. 60 positions of the lever 16 and the arm 14. These parts 1In FIGURE 1, 10 is a rigid bracket which is adapted to handling means, . FIGURE 2 is a front elevation, be bolted or otherwise secured to the frame of a press to carry the Work-handling means. The form of this bracket will depend on the design of the press. may be retained in that position by a bar inserted under the lever intoa hole 34 in the plates 11 in order to hold the arm and the gripper device out of the way for tool Two spaced vertical plates 11 depending from the 65 setting or like operations. The bar 26 carrying the gripper assembly will normally bracket form a rigid frame for the work-handling means and aligned slots 12 are formed in the plates. These slots are vertical throughout the major part of their length but a short part at the lower end is curved 70 slightly as shown at 13. The work-handling arm 14, at a point a short distance below its upper end, carries rollers ‘15 working in the be substantially horizontal when the arm is in its rest position, but the angular relationship between the bar and the arm can be adjusted to suit particular circum stances. For this purpose a screw-threaded rod 35 pivot ally connected to a laterally extending arm on the lug 25 is taken through a hole in a bracket 36 ?xed on the 3,040,685 4 A 3 arm and the angular position of the lug is adjusted by of said arm, and ?uid-pressure means operably con nected to said lever for moving the lever angularly to means of nuts 37 screwed on to the rod on opposite sides’ of the bracket. 7 cause the arm to move bodily in a vertical direction and to swing about the axis of its pivot member. The point in the outward movement of the arm at, which the pressing is releasedis conveniently controlled by a a 3‘. Work-handling means as'in claim 2 wherein said switch 40 which is vertically adjustable on a rod 41 path de?ning means is a slot, said pivot member for the arm being slidably guided in said slot in the frame, the slot being vertical except for a short curved portion at its lower endrin which the pivot lies in the normal rest mounted in lugs on one of the plates 11, the switch being‘ tripped by the lever 16 or by the arm 14. ‘ A convenient layout for the automatic control of the work-handling deviceincorporating the switch 40 is shown 10 in FIGURE 4. position of the arm. , ' 4. Work-handling means as in claim 2 wherein said , When the crankshaft of the press haspassed bottom dead-centre and there is su?icient room for the gripper device to enter between the tools, a cam 45 on the crank shaft closes a switch 46 to energise one solenoid of a double solenoid-operated air valve 47. This admits air to the cylinder 28 which advances and closes the gripper device to grip the pressing. At the same time air is ad pivot member comprises a pin ?xed transversely in the ' arm a short distance from its upper end, rollers on said pin, and said path de?ning means comprises aligned slots in spaced members of the frame in which said rollers are mounted. ' ' 5. Work-handling means as in claim 2 wherein said actuating lever is normally substantially horizontal and mitted through a controllable restrictor valve to a pilot the connection between the lever and the upper end of operated master valve which, after a predetermined and 20 the arm being a pivotal one, said ?uid pressure means adjustable time delay, admits air to the cylinder 20 which comprising a piston and cylinder assembly, the piston raises the arm with the gripping device and pressing and rod of which is pivotally connected to the actuating arm swings it outwardly. As the arm approaches the end ' at an intermediate point in its length. of its movement the switch 48} is closed and energises the 6. Work-handling means as in claim 2 wherein the other solenoid of the valve 47 to reverse the valve. The energisation of the cylinder 28 is reversed so that the pressing is released and the gripper device is retracted, and the cylinder 20 is connected to exhaust so that the arm returns under gravity to its rest position. A manually dispositions of the arm, the actuating lever, and the path in which the pivot member of the arm is guided, are such that on energisation of the ?uid pressure means the arm is ?rst raised bodily through a small distance to lift a work-piece held in the gripping means clear of the tools operated switch 48 is provided to allow the work-handling 30 of a press to which the work handling means is ?tted device to be operated independently of'the press. and then-the arm is rocked angularly to carry the work FIGURE 4 also shows a safety switching arrangement piece outwardly away from the‘ tools to a point where incorporated in the press control circuit. i it is released. ~ A switch 49 adapted to be closed by a cam 50 on the > 7. Work-handling meansas in claim 2 wherein said crankshaft of the press is' connected in parallel with a 35 work gripping means on the lower end of the arm com pressure-operated switch 51 connected to and operated prises a gripping device slidably mounted on the arm by the air pressure in the end of the cylinder 28 to which 7 for movement thereon in a substantially horizontal di air is admitted to retract the gripping means, so that if rection and a double-acting ?uid pressure motor adapted the supply of air under pressure to that end of the cy when energised in one direction to advance the gripping linder should fail, the switch 51 opens and the switch 49 40 device into engagement with and close it on to a work opens and stops the press as soon as the cam 50 clears piece and when energised in the other direction to re the switch. ~ lease the work-piece and retract the gripping device. ‘ In an alternative arrangement a limit switch is mounted 8. Work-handling means for a power press operating on the sleeve 27 and is adapted to be engaged by a striker cyclically comprising a frame secured to the press, a sub on the moving part of the gripper assembly so that the 45 stantially vertical arm, a horizontal pivot member carried press is stopped if the gripper has not been fully retracted by the arm and connected to the frame for substantially when an appropriate point in the cycle is reached, whether vertical movement relative thereto, work-gripping means the failure is due to failure of the air supply or to any on the lower end of said arm, an actuating ‘lever pivoted at one end on a ?xed point on the frame and pivotally a It will be appreciated that work-handling means forms 50' connected to the arm, ?uid pressure operating means op other cause. ' ' e e a complete unit which can readily be ?tted to existing presses. I claim: 1. Work-handling means for power presses compris~ ing a frame, a substantially vertical arm, a horizontal pivot member carried by the arm and connected to the frame for substantially vertical movement relative there to, work gripping means on the lower end of said farm, an actuating lever pivoted at one end on a ?xed point on the frame laterally spaced from the path of move ment of the pivot member and pivotally connected at the other end to the arm, and ?uid pressure means op erably connected to said lever for moving the lever an ‘gularly in a vertical plane to swingrthe arm about the axis of its pivot member and move it bodily in a vertical direction. 2. Workdhandling means for powerpresses compris ing a frame, a substantially vertical arm, a pivot mem ber- carried by the arm, work-gripping means on the lower end of the arm, means de?ning a ?xed vertical path in the frame in which said pivot member is guided for movement along said path, an actuating lever mounted for angular movement in the frame about a erably connected to said lever for moving the lever an gularly in a vertical plane to swing the arm about its pivot and move it bodily in a vertical direction, and a control means for energizing said ?uid pressure means ac 55 tuated by a moving part of the press during each cycle thereof to initiate an operative stroke of said arm in syn chronism with the operation of the press. 9. Work-handling means as in claim 8 further compris ing double acting ?uid pressure means connected for ac 60 tuating said work gripping means, a solenoid-operated valve means operable to energize said double-acting ?uid pressure means in one direction to grip a work piece and subsequently, after a predetermined time interval, energize 65 the ?uid pressure means for moving the arm, said control means including a ?rst switch actuated by a moving part of the press for controlling said valve to cause the grip ping of a work-piece and the movement of the arm on an operative stroke of the press, and a second switch ac 70 tuated by the arm for reversing the valve to cause the release of the work-piece and the retu-rnpof the arm. 10. Work-handling means as de?ned in claim 8 further comprising press control means including means for-stop ping the press upon failure of said double acting ?uid ?xed horizontal pivot laterally spaced 'from the path, a pivotal connection between the lever and the upper end 75 pressure means, and means for rendering said last men~ 3,040,685 5 6 1 cycle of press operation. 11. Work-handling means for a power press or the like comprising an arm of substantial length having vwork grip ping means at one end, a frame, mounting means for pivotally mounting the arm on the frame for swinging movement about a ?rst pivotal axis extending transversely of the length of said arm, said mounting means permit ting also movement of said ?rst pivotal axis along a pre~ determined path, a lever pivoted to said arm on a second 10 pivotal aXis' parallel to said ?rst pivotal axis but spaced therefrom, means engaging said lever at point spaced from said second pivotal axis for guiding the path of movement of the lever, and ?uid pressure means con nected to the lever to move it along its path of move ment and thereby to move said arm. 7 References Cited in the ?le of this patent UNITED STATES PATENTS =tioned means operative at a predetermined point in the i 15 796,541 1,597,967 1,859,956 Tompkins ____________ __ Aug. 8, 1905 Grant et al. __________ __ Aug. 31, 1926 Can?eld _____________ .. May 24, 1932 2,275,561 2,609,776 2,763,167 'Sahlin _______ _..- _____ _._. Mar. 10, 1942 Sahlin ____ __; __________ __ Sept. 9, 1952 Sahlin _______________ __ Sept. 18, 1956 ~ 2,781,136 2,811,266 2,868,582 Sehn et a1 _____________ __ Feb. 12, 1957 Udal _________________ _._ Oct. 29, 1957 Loisell _______________ __ Jan. 13, 1959 OTHER REFERENCES “Sahlin Iron Hand Unloading Machines,” Sahlin En gineering Co., PO. Box 289, Birmingham, Michigan, pp. Sand 8. v '