US2275561A

US2275561A - Work removing apparatus for presses

Info

Publication number: US2275561A
Application number: US357453A
Authority: US
Inventors: Sahlin Henry
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1940-09-19
Filing date: 1940-09-19
Publication date: 1942-03-10
Anticipated expiration: 1959-03-10

Description

March 10, 1942.

WORK REMOVING APPARATUS FOR A PRESS Filed Sept. 19, 1940 3 Sheets-Sheet l x h c .J 5 [I' l]! I h" Ill" W I" W H. SAHLIN 2,275,561

March 10, 1942.

H. SAHLIN WORK REMOVING APPARATU S FOR A PRESS s Sheets-Sheet 2 Filed Sept. 19, 1940 INVENIOR.

H. SAHLfN 2,275,561

Filed Sept. 19, 1940 3 Sheets-Sheet 5 WORK REMOVING APPARATUS FOR A PRESS March 10, 1942.

b .4. WWW Q\ Patented Maia-1Q, 1942 2,275,561

UNITED STATES PATENT OFFICE WORK REMOVING APPARATUS FOR PRESSES Henry Sahlin, Detroit, Micln, assignor to Genera] Motors Corporation, Detroit, Mich., a corporation of Delaware Application September 19, 1940, Serial No. 357,453 Claims. (Cl. 113-50) This invention relates to material handling and in Fig. 1, where the work is designated W. As

, has for its object material ejecting apparatus the ram rises, the knock-out portion 5 of the designed to be used with metal stamping presses female die rises relatively to the lower die (as and to be automatically operated by the press is shown in Figs. 2 and 3). This knocks out and particularly by the up and down movement 5 or releases the work W. As the ram rises, the of the ram of the press. cam 24 strikes the trip arm 25 that controls the Referring to the drawings: fluid valve 26. This allows fluid to pass through Fig. 1 is a side elevation of the apparatus pipe 2| to the left end of cylinder l9, causing shown in connection with a press, the latter p st to travel to t e right own in being shown in a sketchy diagrammatic way. 10 Fig. 5). This causes the open jaws II and I2 'Fig. 2 is a similar view of the apparatus after to straddle the edge of the work which has been the work has been released from the die and knocked out of the' lower die (as shown in Fig. the apparatus has gripped the work. 2). As the jaws are pushed to the right to Fig. 3 is a similar view of the apparatus as straddle the work, the upper arm 28 of the bell the same is in process ofpulling the work out crank lower arm ll strikes the shoulder 21 at of the press. i the end of the arm l5. This causes the lower Fig. 4 is a detail view of the gripping arm, jaw to revolve on pivot l6 counter-clockwise and together with the gripping jaws in open position. thereby the la s are brought ogether to g Fig, 5 is a similar view showing the jaws in the work. As the ram rises, the projecting roller closed position, 29 strikes the upper end 30 of the pivoted arm 6. Fig. 6 is a section on the line 6-6 of Fig, 5, This has a cam surface 3| adapted to ride along I designates the rain of the press and 2 desigt ro 29 and the arm is Caused t0 Swing nates the bed'of the press. The ram is provided out o h dotted line position wn in i 3 with a suitable punching die 3 and the bed of where the arm is over the traveling conveyor the press with a suitable female die 4. This has 3 At this p n the p arm d ps ff cam a portion 5 which acts as a knock-out or release 2 n h id f h as wn by he dotted at the proper time. The usual knockt; pins line position A in Fig. 3. This allows the spring may be substituted for this arrangement, A 33 to return the fluidcontrol valve to the released knock-out, however, is not always required beposition and allows the air to exhaust through cause in some instances the work hand itself the a as Shown by the arrows n Figs. 1 and can be used as a knock-out device, 3. Spring 20 returns piston l8 to the left hand A heavy pendant arm 6 is pivoted at 'l and, position (as shown in Fig. 4) and the jaws sepa- 'when not actuated, swings down to the vertical rate (as Shown in 4 nd n dotted lines in position how at a i Fi 3, a, stop 9 being Fig.3). This drops the work onto the conveyor provided to prevent its overswinging against the 32 Which is Continuously o press. This arm carries the work gripping arm It is poss y altering t Cam Surfaces, to I 0 which is provided with tw jaw H a d I2, swing the arms 6 out to substantially horizontal each provided with a toothed or serrated gripposition where the work will bedropped in such ping piece I3 removably secured in place by away that it inverts itself, if this be desired. screws II. The upper jaw is arranged to slide 40 I claim:

in the guideway IS on the arm Ill. The lower 1. In an apparatus for removing work from a jaw is in the form of a bell crank lever and is press or other like machine, the combination pivoted at l6 to the sliding upper jaw member. with two relatively movable members such as The sliding upper jaw is connected to the end the ram and bed of a press, a swinging pendant of a piston rod I! which, in turn, is connected mm supported at the side of the machine and to piston l8 that slides in cylinder I 9. Spring having at its lower end a pair of jaws for grip- 20 tends to keep the piston to the left of its ping the work, the movable member of the mastroke. Pipe 2| connects with the left hand end chine arranged in its upward movement to cause of the cylinder. Pin 22 holds the bell crank the pendant arm to swing upwardly and outlever or lower jaw member II in the open posi- 5O wardly into a position away from the press and tion shown in Fig. 4. means for causing the jaws to grip the work be- The operation of the machine is as follows: fore the arm swings upwardly and to p the A piece of sheet metal having been put between work free from the press as the pendant arm the dies, the ram of the press is caused to descend reaches the outward end of its movement, in the usual way and stamps the metal, as shown 2. In an apparatus for removing work from a arranged in its upward movement to cause the pendant arm to swing upwardly and outwardly into a position away from the press and means for causing the jaws to grip the work before the arm swings upwardly and to drop the work free press or other like machine, the combination with 4 two relatively upwardly and downwardly mov able members such as the ram and bed of a press, a swinging pendant arm supported at the from the press as the pendant arm reaches the outward end of its movement, the said last men tioned means comprising a piston and cylinder connected with the jaws for operating the jaws, said cylinder furnished with fluid automatically controlled by the movement of the movable member of the machine.

3. In an apparatus for removing work from a press or other like machine, the combination with two relatively upwardly and downwardly movable members such as the ram and bed of a press, a swinging pendant arm supported at the side of the machine and having at its lower end a pair of jaws for gripping the work, the movable member of the machine arranged in its upward movement to cause the pendant arm to swing upwardly and outwardly and means for causing the jaws to grip the work before the arm swings upwardly and to release the work as the pendant arm reaches the outward end of its movement, the said last' mentioned means comprising a pair of jaws which slide with respect to the arm and one of which is pivoted to the other and provided with an arm portion arranged to be tripped by a shoulder, a piston and fluid cylinder with the piston connected to the sliding jaws to cause the jaws to advance upon the work and straddle the same and the pivoted jaws with the trip arm arranged to engage a shoulder on the pendant arm to cause the pivoted jaws to close one upon the other and upon the work and fluid control means controlled by the movement of the movable member of the press.

4. In an apparatus for removing work from a fill side of the machine and having at its lower end a pair of jaws slidable at a unit on the arm and for gripping the Work, the movable member of the machine arranged in its upward movement to cause the pendant arm to swing upwardly and outwardly and means for causing the jaws to move independently of th arm to straddle the work and to grip the work before the arm swings upwardly and to release the work as the pendant arm reaches the outward end of its movement, the said last mentioned means including a fluid cylinder and piston for causing the jaws to slide with respect to the arm to close upon the work and to release the work and a fluid valvesupported adjacent the side of the machine and having a trip arm and a cam on the movable member of the machine for engaging the trip arm to control the valve which controls the fluid to the piston.

57 In an apparatus for removing stampings from a press, the combination with a machine having a bed and a movable ram having a trip member of a pendant arm pivoted at its upper end and having a portion of the upper end of the arm forming a cam surface to be struck by the member on the ram to swing the arm and the work out from th machine. the lower end of the arm extending at an angle to the pendant portion of the arm and slidable jaws slidable on said arm end and one pivoted with respect to the other and a fluid cylinder and piston for advancing the jaws to a straddling position on the work and one of the jaws pivoted and provided with a trip portion adapted to engage a stationary portion of the arm when the jaws have been slidably advanced to the straddling position to cause the jaws to close upon the work and a valve in proximity to the ram and controlled by the movement thereof to regulate the nuid'supply and the exhaust from the fluid cylinder.

HENRY SAHLIN.