US2122648A - Work remover - Google Patents

Description

s. N. JOHNSON 2,122,648

WORK REMOVER July 5, 1938.

Filed Aug. 22, 1955 2 Sheets-Sheet l INVENTOR. 57/4/12 6') N JOHNSON ATTORNEY.

July 5; 1938. s. N. JOHNSON 2,122,648

' WORK REMOVER I Filed Aug. 22, 1935 2 Sheets-Sheet 2 INVENTOR. 574NLF) N JOHNSON ATTORNEY Patented July 5, 1938 iJNirEo STATES PATENT OFFICE WORK REMOVER Application August 22,

1 Claim.

This invention relates to work removing devices and particularly to a work removing device for association with intermittently operating work forming machines such as punch presses or the like.

It is a general object of the invention to provide an intermittently operable work removing conveyor to cooperate with an intermittently operating forming machine, and it is a particular object to provide such a work removing conveyor which is automatically operable in timed, coordinated relation to the movements of the forming machine, and which is constructed in such a manner as to be self-unloading.

It is a further object of the invention to provide timing mechanism to effect the automatic, intermittent operation of the work removing conveyor.

In the drawings:

Figure 1 is a side elevational view of a punch press of conventional design having the device of the present invention secured thereto in operative relation;

Figure 2 is a side elevational view of the punch press with the work removing table secured thereto;

Figure 3 is a fragmentary elevational view, partially in section, showing the work remov ing table in work receiving position;

Figure 4 is a fragmentary elevational view showing a portion of the timing mechanism in one position;

Figure 5 is a fragmentary View showing the punch in its upward travel in relation to the work removing table, as shown in Figure 3;

Figure 6 is a view of the work removing table similar to that of Figure 3 but showing the table in work delivering position;

Figure 7 is a fragmentary elevational view of the timing mechanism in another position from that shown in Figure 4; and

Figure 8 is a fragmentary view showing the punch in its downward travel in relative position to the work removing table as shown in Figure 6.

Referring now to the drawings, reference numeral ID indicates the upright, spaced frame members of a punch press having a crank shaft journaled in the ends thereof and which in end thereof to receive power from a belt or other suitable source. A connecting rod I3 is pivotally mounted upon a crank pin M to be intermittently reciprocated by the rotation of the crank shaft and is suitably secured to a ram l6 having a turn is provided with a fly wheel |2 at either 1935, Serial No. 37,290

punch positioned on the lower side thereof which may cooperate with a die |8 to form the work when the ram I6 is in its lowermost position. As the ram and punch move upwardly the work is carried on the punch and is removed therefrom by stripper plates |9 mounted on the frame I0.

The work removing device of the present invention comprises a base 2| suitably secured to the frame |,|l adjacent the path of the ram |6 and having spaced vertically extending supporting frames 22 secured thereto which in turn are provided adjacent their upper edges with parallel channels or guides 23 to receive the opposite edges of a conveyor table 24 reciprocably mounted to move fore and aft therein. The table may be provided with vertically extending brackets 25 at its forward end for preventing the work, indicated at 20, from sliding off when the table is moved to the left.

A cylinder 26 is secured as at 21 to an upstanding bracket 28 which in turn is suitably secured at 29 to the base 2|. For alternately reciprocating the table 24, a piston 3| is mounted within the cylinder 26 and is provided with a piston rod 32 exending outwardly of the cylinder, and which in turn is adjustably and pivotally connected as at 33 to an arm 34 intermediate the ends thereof. The arm 34 is pivoted at its upper end at 36 to a boss 31 formed on the under side of the table 24, and at its lower end is provided with an enlarged longitudinally extending slot 38 pivotally mounted on a pin 4| carried by an upstanding boss 42 on the base 2 I, thus providing a lost motion connection for the arm. This latter construction prevents binding of the table in its guideways as it is moved fore and aft, and provides a downward pull as the table 24 is started in motion.

The power medium for actuating the piston 3| is preferably compressed air but may conveniently be oil under pressure, or any other well known means. Suitable fluid inlet connections (not shown) are made to a valve casing 44 mounted upon a horizontally extending bracket 45, and a fluid supply conduit 46 leads from the casing to the interior of the piston cylinder 26 adjacent one end thereof, and another fluid supply conduit 41 also leads from the casing 44 to the opposite end of .the piston cylinder 26 and communicates with the interior thereof.

For alternately admitting the fluid under pressure to the conduits 46 and 41, a suitable dual valve mechanism is provided and comprises, in the present instance, a valve casing 44 and a which extend through the guide plate 48 and prises a pair of cams 52 and 53 adjustably secured reciprocate with the rods.

operate the valves in the valve casing 44.

For alternately actuating the dual valve mechanism to in turn cause the table 24 to be reciprocated fore and aft in coordinated, timed relation to the intermittent movements of the ram l6 of the punch press, a timing and valve actuating mechanism is provided which comto an extended portion Ila of the crank shaft II and relatively positioned thereon so that one cam surface follows the other to provide the necessary timing. A pair of push 'rods 54 and 55 are reciprocatably mounted in a bearing bracket 56 carried by a vertically extending member 56a which in turn is mounted on the bracket 45. Each of the push rods 54 and 55 is provided with a cam follower 51, which in the present instance is a roller journaled in the bifurcated ends 58 of the push rods. Adjustable tappets 59 and 61 are mounted in the ends of push'rods 54 and 55 and Bracket 62 is secured to the vertical member 55a. Compression springs 63 and 64 are positioned betweenspaced spring seats 66, 67, 6 8 and 69,, the upper spring seats 68 and 59 being adapted to be engaged by the enlarged portions II and i2 of the push rods 54 and 55. The lower spring seats 66 and 6.1 engage the bracket 62.

In operation, the ram [5 carrying the punch i1 is reciprocated by the crank shaft It to intermittently engage the die i 8 to form the work. As the ram I B and punch I! are moved upwardly, the work 20 is removed from the punch I! by the stripper plates [9 and drops therefrom.

Just prior to the removal of the work from the punch, the cam 52 on, the crank shaft engages the cam follower 5! of the push rod 54 to force the tappet 59 into engagement with the valve stem push rod 50, thus opening the valve. Compressed air is thus admitted to the supply conduit 46 from the valve casing 44, and enters the cylinder 26 at one end of the piston 3|, forcing the piston to the right and in turn moving the lever arm 34 to the right carrying the table 24 within its guides ways 23 also to the right, into the position shown in Figures 2 and 3 to receive the work 20 as it is stripped from the punch l1.

As soon as the work drops on the table, th cam surface 53 engages the follower 51 on the push rod 55 to engage tappet 6| with the other Valve stem push rod 5!, thus opening the valve to provide fluid communication from the valve casing 44 to the supply conduit 41, which in turn supplies compressed air to the opposite end of the piston 3i, forcing it to the left to pull the lever 34 and table 24 quickly to the left. The

piston 3!, and therefore the table 24,, stop quickly in the position shown in Figure 6, and the momentum of the work 20 carries it ofi the table on to a suitable conveyor or into a container, not shown.

As soon as the table 24 moves to the left the ram Hi again moves downwardly to engage the die [8 and the cycle of operation is repeated.

The work remover is equipped with a safety device to prevent the return of work 29 with table 24 if for any reason the work is not discharged from the table on its outward movement. This device consists of a safety arm 'i5 fastened to. a shaft 14. Shaft 14 is rotatably mounted in supports 73 which are attached to frame mem bers 22. A stop arm 16 is secured to one end of shaft [4. 'It is adapted to contact a stop pin 11 attached to support 13.

When the table 24 moves work 29 out from under the press on the outward movement of the table, the work strikes arm lifting it sufficiently to permit the work to pass under the arm. After the work has passed underarm 15 the arm drops back to the position shown in Figure 2 and thus prevents work 29 from being carried back under the press in case it is not properly discharged from table 24. Stop arm 16 and pin 11 serve to limit the rotary movement of arm 15, thus preventing the possibility of it beinglifted so far that it will not fall back in place after the work has passed beneath it. a

It will thus be seen that a completely automatic device is provided for removing work from forming machinery. The device automatically receives the work, conveys it from 'themachine, automatically unloads itself and'return's to receiving position. A precision timing andactuating mechanism is provided together with means Various modifications in the construction and design of the conveyor device as shown and described and numerous adaptations of the device may be made to the various types of work forming machines without departing from the spirit or scope of the invention which is to be limited onlyby the appended claim.

I claim: V

In a work removing device, a base, a supPQrting member secured to said base, a conveyora connecting rod connected to said piston and secured to said arm intermediate its ends,.and means for alternately applying fluid pressure to end o id pi to to a ernat l reciprocate said table in opposite directions.

STANLEY N. JOHNSON.

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