US2547304A - Ejector mechanism for heading and like machines - Google Patents

Description

D. G. BRoscoMB 2,547,304 EJECIOR xvnIcHANIsA/x- FOR HEADING AND LIKE MACHINES i April 3, 1951 Filed April 18, 1950 FIGA.

M w- [Inwlflll l a..-\\\\ 5 m @JW pNVEN-ro? vlost-motion in. the mechanism. Ytion. produces. undesirablenoise and wear of the parts and heavy momentary accelerations civ Patented Apr. 3, 1951 EJECTOR MECHANISM FOR HEADING AND LIKE MACHINES Dennis George Broscomb, Smethwick, England, assigner to G. K. N. Group Services Limited, Smethwick, England, a British company Application April 18, 1950, Serial No. 156,533 In Great Britain March 19, 1949 8 Claims.

invention relates to machines in which workpieces, usually in the. form of a length of wire or rod, are inserted in a die, with the inner end engaging the end of an ejector pin and the outer end projecting from the die so that heading or other operations can be effected thereon, during which operations the work is supported against endwise movement by the ejector pin, means being provided for moving the ejector pin endwise until its outer end reaches a definite and preselected position so as to eject the work after the conclusion of the operation on each workpiece.

In this kind of machine. it is sometimes important that the outer end of the ejector pin when on its outward movement shall not usually project beyond the end of the die because it is usual to provide carrying tools for the workpiece which slide across the end of the die. Further, workpieces of many different lengths may be used in the machine and it is therefore necessary to provide for an adjustment of the ejector actuating means so that. the inner position of the outer end of the ejector pin can be adjusted to the correct distance from the end of the die for engaging and supporting the work during the heading or other operation. Hereaiter the operation of adjusting the inner position of the end of the ejector pin to suit the length of the work is refer-red to: as setting and the operation of moving the. ejector pin endwise. until its youter end moves to the end of the die is referred to as "operating.

Hitherto in apparatus of the kind referred to it has been usual to provide two separate con- I,

tro-1s, one for adjusting the setting position and the other for adjusting the travel of the member which actuates the ejector pin, and it has been found in practice that difficulty has been experi- Venced. in getting operators to make these two adjustments. correctly,` with the result that in some cases the driving member is adjusted to have. a travel greater than is necessary, with resultant Such lost-mopartsof theA mechanism,"

The. object ofr the present invention is to over-` ;the= ejector pin. Hereafter however these two 2 members will be treated as a unit and referred to as the ejector pin.

According to the present invention adjustment members connected to link mechanism operated by a power-driven driving member.

Also according to the present invention a single adjusting member is used for adjusting the setting and operating means for the ejector pin, and such means comprise separate setting and operating levers pivoted on a common axis, said levers being adapted to move together without moving relatively to one another when the mechanism is being set, and the operating lever making an oscillating movement independently of the setting lever when'the operating lever is moving the ejector pin and when making its return movement, said levers being connected by a linkage, one link being pivoted to the operating lever and being engaged by an oscillating actuating lever having an arcuate actuating surface which, prior toits working stroke, is concentric with the centre on which the operating and setting levers are pivoted, the operation of setting causing a variation in the distance between the pivot of the actuating lever andk the point of contact between the, link connected to the operating lever and the actuating surface of the actuating. lever, whereby the` amount. of movement imparted to the operating lever by the actuating lever is automatically varied to suit the setting :position of the operating and setting levers.

The. invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a sectional view in side elevation; and.

Figure 2 is a section on the line 2 2.

In the construction illustrated the machine comprises a frame or body made in a number of parts il), il, l2, I3, Ill, l5, which are secured t0- gether by means not shown.

The parts' Ill and lil provide guides for the ejector pin i6, which is mounted for endwise reciprocation and which is provided with a flange or collar Il acted upon by a spring i8. bearing against the inner end of a recess le in the part lilV and producing the return movement of the ejector pin.

Ther part. I4 is providedY with a cylindrical hole 20 in which the work is placed and from which it is ejected by the. ejector pin I6.

The part l2 ofv the. body is providedY with a threaded hole 2i in which is a threaded sleeve 22 having a non-circular end 23 so that it can be turned to adjust it in an endwise direction, this sleeve 22 being mounted coaXially with the ejector pin I6. Further, at the end the sleeve 22 is provided with a flange 24 and contains a bush 25 in which one end of the ejector pin I6 is guided.

The part il of the frame is provided with a pair of spaced lugs 26 carrying a pivot pin 21.

Mounted on this pivot for pivotal movement around its axis are the setting and operating levers. The operating lever is in the form of a bellcrank lever having a primary arm 28 and a secondary arm 29. The primary arm at its end is formed as a fork 30 engaging over the ejector pin IS and having an arcuate surface 3l engaging one side of the ange or collar l1. The opposite side 32 of the end of the arm 28 is flat.

The setting lever comprises two spaced members 33 each in the form of a bellcrank lever, these members 33 being mounted to turn on the pivot 21 and being situated at opposite sides of the operating lever. The setting lever has two primary arms 34 situated side by side, and in between these arms is fixed a block 35. The arm 34 terminates in a fork 35, one side 31 of which is flat and engages the surface 32 of the operating lever, while the other side 38 of the fork is of arcuate form and engages the end of the brush 25 and flange 24 of the screwed sleeve 22.

The setting lever is provided with a secondary arm 39 formed in two spaced parts.

The secondary arms 29 and V3E! are provided with pivots 4U, 4I. Mounted on the pivot 4I is an actuating link 42 made in two parts arranged side by side, this actuating link being parallel to the secondary arm 39 of the setting lever.

The linkage also includes a control link 43 mounted on the pivot 4i) and on a pivot 44 carried by the two parts of the actuating link 42. The control link 43 is parallel to the secondary arm 29 of the operating lever.

The actuating link is extended beyond the pivot 44 and provided with a roller 45 freely rotatable on a pin 46 carried by the two parts of the actuating link. Further, the actuating link 42 is eX- tended at the opposite end, as shown at 41, and provided with a pin 48 upon which three tension springs 49 are mounted. The end of one of these springs 49 is disposed on the pin 48 between the two parts of the actuating link, and the ends of the other two springs 49 engage the ends of the pin 48 on theouter sides of the two parts of the actuating link.

The part i3 of the frame is provided with two upwardly-projecting lugs 50, and secured to the top of each of these lugs is a bracket 5l. Pivoted between these brackets on pivots 52 is an actuating lever 53, this lever 53 having an arcuate surface 54 which is engaged by the roller 45. The surface 54 prior to theJ working stroke of the operating lever is concentric with the axis of the pivot 21. At one side (see Figure 2) the actuating lever is provided with an arm 55 which engages or is provided with one of the pivots 52 and terminates at its upper end in a fork 56 in which a roller 51 is mounted for rotation. This roller is acted upon by a driving ca-m 58 mounted on a driving shaft 59. At the other side the actuating lever has an arm 69 which carries or engages the other pivot 52. The roller 51 is kept in contact with the cam by the springs 5G. The actuating lever 53 is provided with a pair of spaced lugs 6l carrying a pin 62 on which are pivotd three spring-loaded pins 63; each of these can slide in a tube 54 having a flange 55 and a stem 56 which is located in a block 61 secured to the inner surface of the machine body. The springs 65 act between the ilanges 65 and collars 63 on the pins 53 so that the actuating lever 53 is spring-loaded in a clockwise direction, as shown in Figure 1, and the roller 51 is kept in contact with the cam. The cam provides a dwell for nearly one half of each revolution during which the ejector pin is stationary and it provides for a smooth uniform acceleration and deceleration of the movement of the ejector pin at each working stroke.

The lower ends of the springs 49` are attached to a pin 1D carried by the lugs 5I.

The setting lever 34, 39 can be adjusted by turning the sleeve 22 by means of the non-circular part 23, and such adjustment alters the position of the outer end of the ejector pin at the inner end of its stroke. This adjustment is transmitted to the operating lever 28, 29 by reason of the fact that the two surfaces 32 and 31 are in contact during setting. Every setting adjustment produces a corresponding adjustment in the length of travel of the operating lever arm 28, as required to ensure that the outer end or the ejector pin moves to the selected position at each operation. Moreover, lost-motion is avoided and the disadvantages arising therefrom are eliminated.

Further, setting adjustments cause the roller 45 to move along the surface 54 so as to increase or decrease its distance from the aXis of the pivots 52. As the roller 45 moves towards the said axis the amount of movement imparted to the operating lever arm 23 decreases correspondingly to the setting adjustment which is made.

\In operation of the device the driving cam 55 engaging with the roller 51 causes the actuating lever 53 to pivot about its axis 52, compressing the springs 50, and the arcuate surface 54 of the lever being in engagement with the roller 45 of the actuating link 42, the link is moved bodily in an arcuate path determined by a link 43 and the secondary arm 29 of the operating lever, the springs 49 being tensioned as the link 42 moves. Pivotal movement is imparted by the link 42 to the secondary arm 29 of the bell crank operating lever, which lever pivots about its axis 21, the primary arm 28 thereof causing the work-ejecting movement of the ejector pin I5 against the action of the spring I8, whilst the setting lever 33 remains stationary. The springs I8, 49 and 65 return all parts of the mechanism with which they are associated to the starting position shown in Figure l of the drawing.

What I claim then is:

1. Ejector mechanism for heading and like machines comprising a slidably mounted ejector pin, a setting member for setting the initial position of the pin, an operating member for moving the pin to its ejecting position, link mechanism connected to said setting and operating members, an actuating lever for operating said link mechanism, a driving member for oscillating the actuating lever and a single adjusting member acting on said setting and operating members for simultaneously adjusting the initial position of the setting member and the length of travel of the operating member.

2. Ejector mechanism for heading and like machines comprising a slidably mounted ejector pin, a setting lever for setting the initial position of the ejector pin, an operating lever for moving the pin to its ejecting position, said levers being pivotally mounted coaxially, and each having a primary ar-In and a secondary arm, the two secondary arms being disposed in diverging relationship, an actu-ating link pivoted tothe secondary arm of the operating lever, a control link pivoted to the secondary arm of the setting lever, said actuating and control links being pivoted to each other, an actuating lever for operating said link mechanism, -a driving member for oscillating the actuating lever and a single adjusting member' acting on said setting and operating members for simultaneously adjusting the initial position of the setting member and the length of travel of the operating member.

3. Ejector mechanism for heading and like machines according to claim 2 wherein the two secondary arms and the two links form a parallelogram.

4. Ejector mechanism for heading and like machines according to claim 2 wherein the two secondary arms and the tWo links form a parallelogram and the actuating lever has an arcuate surface, the centre of which is disposed at the axis of the' pivot of the operating and setting levers, said surface being engaged by means on the actuating link, Y

5. Ejector mechanism for heading and like machines according to claim 2 wherein the actuating lever has an arcuate surface, the centre of which is disposed at the axis of the pivot of the operating and setting levers, said surface being engaged by means on the actuating link, and the driving member is a rotary driving member and engages means on the actuating lever and causes it to oscillate.

6. Ejecting mechanism for heading and like machines comprising a machine body, a slidably mounted ejector pin guided in said body, a collar on said ejector pin, a spring on said pin acting on one side of said collar, a setting lever for setting the initial position of the ejector pin, an operating lever for moving the pin to its ejecting; position, said operating lever engaging the other side of said collar, and a single adjusting mem. ber acting on said setting and operating members for simultaneously adjusting the initial position of the setting member and the length of travel' operating members, an actuating leverl for oper-ating said link mechanism, a driving member for oscillating the actuating lever.

7. Ejector mechanism for heading and like machines comprising a machine body, 4a slidably mounted ejector pin guided in said body, a collar on said ejector pin, a spring on said pin acting on one side of said collar, a setting lever for setting the initial position of the ejector pin, an operating'lever for moving the pin to its ejecting position, said operating lever engaging the other side of said collar and a single adjusting member acting on said setting and operating members for simultaneously adjusting the initial position of the setting member and the length of travel of the operating member, said adjusting member being formed by a sleeve screwing into said body, said sleeve being in line with said ejecting pin, said setting lever engaging between said adjusting member and said operating member, link mechanism connected to said setting and operating members, an actuating lever for operating said link mechanism, and a rotary driving member producing oscillation of said actuating lever.

8. Ejector mechanism fo-r heading and like machines comprising a machine body, a slidably mounted ejector pin guided in said body, a collar on said ejector pin, :a spring on said pin acting on one side of said collar, a setting lever for set-r ting the initial position of the ejector pin, an

operating lever for moving the pin to its ejecting position, said operating lever engaging the other side of said collar and a single adjusting member acting on said setting and operating members for simultaneously adjusting the initial position of the setting member and the length of travel ofthe operating member, said adjusting member having screw operated adjustment in relation to the body, said setting lever engaging between said adjusting member and said oper-ating member, said levers being pivotally mounted coaxially, and each having a primary arm and a secondary arm, the two secondary arms being disposed in diverging relationship, an actuating link pivoted to the secondary arm of the operating lever, a control link pivoted to the secondary arm of the setting lever, said actuating and control links being pivoted to each other, the two secondary arms and the two links forming a parallelogram and an actuating lever for operating said link mechanis-m, a driving member for oscillating the actuat' ing lever and said actuating lever having an arcuate surface, the centre of which arc is disposed at the axis of the pivot connecting the setting and operating levers, said surface being engaged by means on the actuating link at a position which can be varied by moving the adjusting member in relation to the body, Y

DENNis GEORGE BRoscoMB.

No references cited./

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