US2521461A - Blank ejecting mechanism - Google Patents

Description

Sept. 5, 1950 H. F. JORDAN BLANK EJECTING MECHANISM 2 Sheets-Sheet 1 Filed Feb. 14, 1947 INVENTOR.

HOWAR D F, JQR DAN ATTD RN EYS P 1950 H. F. JORDAN 2,521,461

BLANK EJECTING MECHANISM 2 Sheets-Sheet 2 Filed Feb. 14, 1947 INVENTOR. HOWARD F. JORDAN ATTD RN EYS Patented Sept. 5, 1950 UNIT ED S TATE S PA'EENLT' OFfIiCE' BLANnEJEo'rING MECHANISM Howard F. Jordan, Beloit, Wis.

Application February 14, 1947, Serial No. 728,523

3 Glaims. I

My present invention relates generally tomachinesfor punching metal sheets, and more spe-,

or knockout pin for use with a power operated.

vertically reciprocal punch press, with a selective and interchangeable use of wide variety.

The primary object of the inventien the provision of, mechanism. for ejecting the blank from the die of a punch press, which employs a positive impact ejector operating in a horizontal plane to eject; the blank from. the. die and clear the die for a succeeding operation of the reciprocating punch; andv means areprovided for retarding the ejection until the punch has cleared the way for ej ec-tion.

The ejecting mechanism consists in certain novel combinations and arrangements of parts includingv a spring actuated ejector and its cam controlled mechanism as will hereinafter be d6"! scribed and more specifically set forth in my appended claims.

The component parts of the ejecting mechanism may bemanufactured with facility at com paratiyely low cost of production, and assembled conveniently to insure a reliable,- durable, and efficient; mechanism, readily adapted for use with. a variety of vertically operating punch presses and similar; power tools.

In the accompanying drawings 1 have illustrated'a complete example of a physical einbo di rnent ofmy inventicnin which the parts are combined and arranged in accord with one model have devised for the practical application of the principles of my invention. It will however, be understood that changes and alterations are contemplated and. may be made in theseexemplifying drawings and mechanical structures, within the scope of my claims without departing from the principles of the invention.

Figure: 1 is a view in side elevation showing part of av punch press and die with which the ejector mechanism is combined and. shown in position to retard or hold out the ejector for delayed action in knocking the black from the die.

Figure 2 is a front elevation of the mechanism with thecam deviceuplii-ted.

Figure 3 is a top plan View of ejector mechanism.

Figure 4 is a View in side elevation with the ejector pin held in retracted position.

Figure 5 is a view partly in section and partly in elevation with the parts in position of Fig. 4.

Figure 6 is a fragmentary detail side elevation showing the co-action of the actuating cams and rollers for the ejector bolt or Figure '7 is a vertical.v sectional detail-view at; line 'l-"l of Fig. 5.

The ejector mechanism as here. includes a tilv bular base orcylindrical housing I; having twa attaching flanges 2, 2 that'are counterbored forthe bolts 3- that attach it to a. suppcrting mern-- her, as the die shoel: ofthe vertically reciproca ing cutting or punching machine, and; the. nous; ing is provided with a large interior end here 5 and reduced open end bore 5;, the latteryhavm ns? laterally spa ed o tudinal y t di sl ts." i in its'oppositewalls.

A-solid cylindrical, horizgntally disposed knock out bolt or blank ejector fiiis' mounted! in, the; smaller bore of the housingandjits enlarged? head 9 is fitted with a reduced; extension or: pin; liiywnich its-located in position to reciprocatehordze. zontally, and on its: working stroke to. Strike and; eject the punched blank B from thedie, it.

The ejector or knockout bolt is; reciprocally; mounted: in the housingor cylindricalrsleeve, and; it is guided andv stabilized in its movement by; means of a stop pin l2, of cylindrical. shape, that: is passed through theqlateralslots. 'laof; the housing and; also through a'transverse borei I33 ofthe; ejector bolt 8; a

On the opposite ends of the horizontallydise. posed stop pin and exterior of the housing. lit arejournaleda. pair of cam rollers I24, Mhwhich. are retained against displacement by means of a resilient split ringror: snap ring: I55 and: these split rings. engage with annular grooves on the: exterior surface of the stop ping adjacent its ends.

For plunging the ejector or knockout pinagainst the blank B, alarge main spring 116 is; located; in; the large bore 5.012 the housing; coiled about the; ejector. bolt; and interposed; between. the head 9 and the annular wall or shoulden is]? ofthe housing, and. a smaller spring I85, is coiled about the exposed end ofthe ejector bolt 8-,.

interposed'between. the end wall of'the housin and a snap ring illgthat isseated; in an annulara exterior groove; at the end; of the bolt.

In combination withthe resiliently actuated;

plunger or ejector l have shown. alvertically. r.-e.-. ciprocable punch holder 29 as part of the punch press and located above the ejector mechanism and in position for so-action therewith for setting and releasing the ejector, and a vertically arranged carrier 2| is fastened by screws 22 to the punch holder to travel therewith.

The carrier is provided with a pair of spaced wings or plates 23, 23, upon the exterior face of which wings is mounted a pair of vertically 3 spaced rivets 24 having enlarged retaining heads 25. These wings 23 project below the lower end of the body of the carrier 2!, and their squared lower ends are cut off at 28 to form diagonal cam faces adapted to co-act with the rollers Id of the ejector bolt.

A pair of loosely sliding guide plates or stop plates for temporarily holding the ejector as in Fig. l are mounted upon the side wings of the carrier, and these plates are slotted at 28; and retained in sliding position by means of the heads 25 of the fixed rivets.

By this cam arrangement a delayed plunging action of the spring pressed ejector is attained and the ejector is held out until the blank B has been cleared by initial upward movement of the punch, and then by impact from the front pin of the ejector the blank is ejected from the die.

With the cams of the carrier in elevated position of Fig. 2, and as the punch holder and cam device descend on a punching stroke the carrier and guides initially straddle the housing. The straight bottom edges of the guide or holding plates, and the cam faces encounter the rollers and the slotted slide plates are instantaneously supported on the rollers as the cam device continues to descend.

In this continued downward movement of the carrier the rollers move the side plates 21 upward and the cams push against the rollers thus drawing the plunger outward and forcing the ejector bolt or plunger away from the die, and as the rollers move from under the guide plates, these free sliding plates fall in front of the rollers. On the initial upward movement of the carrier the cam moves from engagement with the rollers and the rollers engage the side faces of the guide plates as shown in Fig. l to hold the ejector against expansion of the main spring, thus preventing the ejecting movement of the bolt until the rollers are released by further upward movement of the plates 21.

On the first portion of the upstroke movement of the punch holder and carrier, the holding plates are thus lifted from in front of the rollers, the ejector i released, and the compressed main spring, by expansion, shoots or plunges the bolt to the left, and the impact pin strikes the blank B.

- After this plunger movement of the ejector, the retracting spring l8, which is compressed onthe ejecting stroke of the bolt, now expands and draws the plunger inward against the end of the main spring l6 so that the ejector is in position for a, succeeding operation.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a horizontally disposed ejector mechanism for a vertically reciprocable punching machine, the combination with a fixed slotted housing and a spring-projected ejector bolt therein having a pair of rollers exterior of the slotted housing, of a vertically reoiprocated carrier mounted over the ejector mechanism, said carrier having cam edges for co-action with the rollers for setting the ejector, a pair of free vertically sliding holding plates mounted on the carrier and comprising substantially horizontal bottom edges and substantially vertical side edges for co-action with the rollers, and mounting means for the carrier whereby said plates maintain the setting of the ejector on initial stroke of the punch holder and are lifted with the carrier above said rollers during the upstroke of the punch holder.

2. In an ejector for a punching machine having a vertically reciprocating punch and holder therefor, the combination which comprises a housing having a slot therein mounted on the machine, an ejector slidably mounted in the housing, a spring positioned in the housing for actuating the ejector in the ejecting operation, a vertically reciprocating carrier having a beveled cam surface on the lower end thereof for resetting the ejector mounted on the punch holder and positioned to coact with the housing, a freely mounted vertically sliding holding plate mounted on the carrier and having a substantially horizontal bottom edge and a substantially vertical side edge positioned to coact with the ejector, and mounting means for the carrier whereby said plate maintains the setting of the ejector on the initial upstroke of the punch holder and is lifted with the carrier above the said ejector during the further upstroke of the punch holder.

3. In an ejector for a punching machine having a vertically reciprocating punch and holder therefor, the combination which comprises a housing having a slot therein mounted on the machine, an ejector slidably mounted in the housing, a spring positioned in the housing for actuating the ejector in the ejecting operation, a vertically reciprocating carrier having a beveled cam surface on the lower end thereof for resetting the ejector mounted on the punch holder and positioned to coact with the housing, a spring for retracting the ejector to its normal position, a freely mounted vertically sliding holding plate mounted on the carrier and having a substantially horizontal bottom edge and a substantially vertical side edge positioned to coact with the ejector, and mounting means for the carrier whereby said plate maintains the setting of the ejector on the initial upstroke of the punch holder and is lifted with the carrier above the said ejector during the further upstroke of the punch holder.

HOWARD F. JORDAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 364,210 Mansell Aug. 26, 1884 1,108,898 Garratt Sept. 1, 1914 FOREIGN PATENTS Number Country Date 599,873 France Jan. 22, 1926

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