US2677342A - Work removing apparatus - Google Patents

Description

May 4, 1954 1 P. MILLER WORK REMOVING APPARATUS 4 Sheets-Sheet 1 Filed June 16, 1950 INVENYIOR. [or] MIY/Qr BY flail/no.1), m, o W

liftornez y 1954 E. P. MILLER WORK REMOVING APPARATUS 4 Sheets-Sheet 2 Filed June 16, 1.950

IIYVENTOR. Ear/ P. M///er y/{LIL e BY MK y 4, 1954 E. P. MILLER WORK REMOVING APPARATUS 4 Sheets-Sheet 3 Filed June 16, 1950 4 INVENTOR. Eo r/ p M/Wer May 4, 1954 E. P. MILLER 2,677,342

WORK REMOVING APPARATUS Filed Jun e 16, 1950 4 Sheets-Swat 4 INVENTOR- Eor/ 1Q M/'//er BY M M M Paiented May 4, 1954 TED STATES ATENT OFFICE WORK REMOVING APPARATUS poration of Delaware Application June 16, 1950, Serial No. 168,490

6 Claims.

This invention relates to Iron Hands for taking stampings out of large presses. The invention is an improvement of the Iron Hand shown, described and claimed in the U. S. patent to Sahlin, 2,275,561.

It is the object of the present invention to provide a work removing arm which is operated by fluid pressure in place of the physical operation that takes place in the apparatus of the Sahlin patent. The improvement resides in the carriage and operating link which raises the work carrying arm and the design of the gripping jaws and the mechanism for opening and closing these jaws in timed relation with the swinging of the work carrying arm.

Referring to the drawings:

Fig. 1 is a perspective view showing the work removing apparatus applied to a large press.

Fig. 2 is a small diagrammatic View showing how the press trips a limit switch which, in turn, through a control box, applies the air or hydraulic pressure to the lifting cylinder and the jaw closing cylinder.

Fig. 3 is a diagrammatic view showing in three stages how the Iron Hand grips the work, then lifts the work from the under die and then swings the work out and drops it.

Fig. 4 is a side elevation of the apparatus show ing the cross bars of a press in cross section.

Fig. 5 is an elevation of the same parts, taken from the right of Fig. 4 with some of the parts broken away.

Fig. 6 is a cross section on the line 66 of Fig. 4.

Fig. 7 is a side elevation of the apparatus showing the work carrying arm swung out. Some of the parts are in section.

Fig. 8 is a cross section on the line 88 of Fig. '7.

Fig. 9 is a side elevation of the gripping member or the Iron Hand itself.

Fig. 10 is a similar view showing the gripping member with the jaws in gripping position.

Fig. 11 is a plan View of the Iron Hand gripping the work.

The frame I can be bolted to cross bars 2 and 3 of the press. This frame I has the upper cross bar 3 and the lower cross bar 5. The side uprights 5 and l are channels or tracks in which the rolls 3 and 9 of the carriage ID are guided. This carriage l B is provided with a saddle l l which supports the cylinder l2. This is a snubbing cylinder or dash pot operating with the piston I [2 (Fig. 2) and a piston rod l3 which is pivoted to the offset M of the frame by means of pivot pin l6 carried by the yoke IT on the end of the rod i3.

The power cylinder [3 is provided with a piston 20 (Fig. 7) and a piston rod I9 which is fastened by jam nut 21 to the cross member 22 on carriage Ill. The carriage is connected by a pair of bent links l5 with the work carrying arm 23. When fluid is delivered to the power cylinder at the lower end by means of a hose 24, it causes the piston 29 to rise and the pair of bent links l5 to throw out the work carrying arm 23 to the spread position shown in Fig. 7.

At the time the ram 55 of the press rises, a stud 25 (Fig. 2) trips the limit switch Ll and this, through a solenoid in the control box 56 operates a valve which delivers the fluid through the tube 2 2 into the lower end of the cylinder l8, and at the same time through hose 26 into the right hand end of cylinder 21 (Fig. 2) that operates the jaws on the Iron Hand itself.

The Iron Hand is shown best in Figs. 9, 10, and 11. Fluid entering a port 28 behind piston 29 causes the piston, through the piston rod 30, to push the slide 3! on the track 32. The slide 3! fits around the track 532. The lower jaw 33 is fixed to slide 3|. The upper jaw 35 is pivoted at 36 on the forward end of the slide. Tractile spring 3! normally opens the jaws as shown in Fig. 9. When fluid enters cylinder 21 in the rear of piston 29 this pushes the slide forward carrying with it the swinging jaw 35 and the lower jaw 33. The tail 38 of this jaw 35 strikes the stop or cam 39 on the end of the arm 34 and this throws the jaw down to grip the work against the lower jaw 33 which slides with the slide because it is fixed thereto by the tongue and groove interlock 4|. When the ram rises to its upper limit the carriage l0 strikes the limit switch L2 with trip 6! (see Fig. 6). This deenergizes the solenoid circuit. This reverses the fluid control valve so that the fluid pressure now goes through hose 42 to the top of the power cylinder [=8 and through hose 4-3 to the front end of the Iron Hand cylinder 21, thereby simultaneously releasing the jaws and forcing the work carrying arm to its lower position. However, this is against the action of the piston H2 in the snubbing cylinder 112 so as to ease the descent of the work carrying arm 23 to its lower position.

When air is first admitted to the power cylinder the travel of the carriage forces the work carrying arm vertically because this is pivoted to the carriage 44 at the top of the frame that has a pair of rollers 45 which engage in the channel tracks 6 and 1. It will be noted that these rollers ii; are spaced, in practice, about one and one-quarter (1%) inches from the rubber bumpers 46 at the ends of these two tracks 6 and I. So the first movement is upwardly for the arm 23, so it first lifts the stamping straight up to free it and strip it from the lower die. Then, when the rollers then strike the bumpers 46 as clearly shown in Fig. '7, the bent links l5 spread the arms as shown in Fig. 7 while the center roller 4'! follows the cam face 48. This is a stabilizing element which need not be used, but it is advantageous as it stabilizes the arm and prevents quivering or shaking that might otherwise take place.

The saddle I! on the carriage supports a rubber bumper block 60 which cushions the drop of the work carrying arm. It will be noted that the trip 6| on the limit switch and the entire limit switch L2 may be adjusted on the slotted chamiel bar 63 welded to the upright 1 and by means of the bolt and nut 64. The position of the limit switch with respect to the travelling carriage 16 may be altered to properly time the operation of the limit switch and the dropping of the stamping and the reversing of the movement of the work carrying arm.

If it is desired to store away the arm so that it will not be in use, the carriage and the arm are raised by man power slightly above the upper limit of the automatic movement, after the fluid has been released in the supply lines. Thereupon the hook 65 is swun by handle 66 below a hook 5'! on the carriage and the carriage is thereby allowed to drop until the two hooks 65 and 61 are locked together by the weight of the work carrying arm.

The work carrying arm is made up of two telescoping cylindrical sections H and 13a. These may be adjusted by the knurled nut 69 and the long bolt 10. On the lower telescopic section II is bolted bracket 12- which carries the elbow 13 on which the bracket T5- is bolted by the bolts 16. This bracket is clamped by bolts 11 to the arbor 34 of the Iron Hand, so the Iron Hand is adjustable both along the lower limb of the elbow l3 and also the arbor 34 which supports the track 32,v the slide 3I,- and the jaws 33 and 35.

What I claim is:

1. Apparatus for stripping and removing work from dies when separated, having in combina tion a frame that can be secured to the press,

a pair of upright tracks on the frame, a tiltable carriage guided for vertical movement on said tracks, a work carrying arm supported by the car-' riage and pivotal with the carriage, said arm forming with the carriage an inverted L in profile, said carriage and arm movable initially vertically, a second carriage supported to travel on said upright tracks, a link pivoted to said second carriage and also to said work carrying arm, a motor having a connection with said second carriage to move the same vertically, means tripped by the movement of the ram of the press for energizing the motor to raise the second carriage, means for causing the lift of the first carriage to be arrested and thereby further efiort exerted on the second carriage to cause the link to push the arm thereby tilting the arrested carriage and spreading the arm from the track, a second motor and a gripping hand operated thereby having jaws caused to grip the work when the second motor is operated coincidentally with the operation of the first motor.

2-. The combination claimed in claim 1 in which a stop is provided to arrest the movement of the arm vertically when the carriage first rises on the tracks and thereby to strip the stamping from the under die and then further movement of the carriage causes the arrested arm to swing outwardly on itspivot.

3. The combination claimed in claim 2 in which the stop is a rubber bumper on the track hit by the first carriage to which the work carrying arm is pivoted.

4. The combination claimed in claim 1 in which the top of the work carrying arm is pivoted to said first carriage with one pair of rollers that engage in the upright tracks and an arm carrying a roller that, when the said pair of rollers are arrested in the vertical lift of the arm, the last mentioned roller then travels arouately, and acam over which said arcuately travelling roller rolls, thus stabilizing the arm in its lifting operation.

5. The combination claimed in claim 1 in which the second carriage carries asnubbing cylinder in which moves apiston and a rod connected with said pistonand a fixed part of the frame.

6. The combination claimed in claim 1 in which the two motors are each a piston and a cylinder furnished with fluidunder pressure, and the means tripped by the movement of the ram of the press for energizing the motors being an electric control and valves.

References Cited in the file of this patent

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