US2915106A - Bending machine having auxiliary actuating means for wing supported bending die - Google Patents

Description

Dec. l, 1959 L. B. BENDING MACHINE HAVING AUXILIARY ACTUATING Filed Nov. 29. 1956y GREEN 2,915,106

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Arran/Veys m i' e 5 :n M m vux 2G @m MN NN N j uw. mme hrm" ww QN QN mm Il Q. E /1MM. -I/Ur/U-- I .r n AnHNrhll llliiil m Mw w ITIJNI'L IHIIHII- M l www l EAR uw .n I .mP Nw SQ R. NQ @Sw Nw mw Smm s L N Nm m... w i@ mw. www u bmm .1 y \s um m .SFJJ( l l`%\ u. F $9/ Q w 1 l, m V w s d u Q n L INVE/vrox. 6E 5. GREEN Arme/vaya v Dec. l, B REEN I L. G BENDING MACHINE HAVING AUXILIARY ACTUATING MEANS FOR WING SUPPORTED BENDING DIE Filed Nov. 29, 1956 l 6 Sheets-Sheet 5 Dec. l, 1959 Filed NOV. 29, 1956 L. B. BENDING MACHINE HAVING AUXILIARY ACTUATING MEANS FOR WING SUPPORTED BENDING DIE GREEN 2,915,106

6 Sheets-Sheet 6 Arran/Veys United States Patent i BENDING MACHINE HAVING AUXILIARY ACTU- rNGIEMEANs FoR WING SUPPORTED BEND- This invention relates to metal bending machines of the .type known in the art asy wing type tangent benders, and is an improvement over bending machines of the kind disclosed in my earlier Batent 27,482,617.

VAs one or" its objects, the present invention provides an improved bending machine having a wing-supported die carrier and embodying means for holding, moving, or controlling the movement of, the dieV carrier relative to the wing and substantially independently of the actuation o f the wing itself.

Another object of vthe present invention is the provis ion kof a drive mechanism for such a movable die carrier wfor assisting in the release of the bending die from the workpiece subsequent to the fabrication of the latter and for insuring the return of the bending die .to its inital pcsition- Another `object of the present invention is the provision of a drive mechanism on the movable wing of a .wing-.type bending machine that is responsive to fluid pressure to move .the die carrier von the wing in a translatoryfashion relative to the wing. t

Still another object is to provide av drive mechanism that is responsive to iiuid pressure to move the die carrier on the Wing in a translatory fashion during the work bending and/or the return swinging movements of the wing.

Another object of the present invention is the kprovision of a drive mechanism for such a wing-supported movable die carrier that is responsive to fluid pressure to move the die carrier in a reciprocating translatory fashion relative to `the wing during the operating cycle of the latter.

vA still further object is the pijovision of a drive mechanism that is responsive to fluid pressure to initiate the translatory movement for the die carrier on the wing at substantially the same time the wing is actuated, or in a ypredetermined timed relationship thereto.

Another object of the present invention is the provision of a drive means comprising novel linkage effective between the wing and the bending die carrier and through which linkage the energy exerted by the drive vlooking'in the direction of the arrows 2 2, and illustrating ythe movable wing in its -initial position in solid lines and its fully raised position in dot-dash lines;

Fig. 3 is a top plan view of the machine of Fig. 1 with the work supporting table removed to show the underlying structure `within the frame of the machine;

Fig. 4 is an enlarged fragmentary sectional view corresponding with a portion ofvFig. 2;

2,915,106 Patented Dec. 1, 1959 ICC Fig. 5 is a 'fragmentary side elevational view showing the movable wing and its cooperative engagement with the front portion of the frame of the machine; the cooperating dies and a portion of the uid conduit system for the wing being removed to illustrate the underlying Wing structure;

Fig. 6 is a vertical section through the wing of Fig. 5 and taken substantially on `section line 6 6 thereof;

Fig'. 7 is a fragmentary vertical section similar to that ofv Fig. 4 but illustrating another embodiment of movable die-carrier driving mechanism; and,

Fig. 8 is a vertical sectional view taken on section line 8 8 of Fig. 7 and showing the wing-supported lbending die carrier of the modified construction.

The bending machine ofthe present inventionn comprises, in general, an upright frame 11 having a stationary die or work support 12 thereon with which an anvil die 1.3, cooperates to clampingly secure a workpiece W in the machine, and a ybending die 14 .carried by a movable plate 14a and actuated through a movable wing 15 so as to have a tangential rocking movement relative to the anvil die yto fabricate the workpiece. i

More specifically and as shown in Figs. 2 and 3 the frame -11 comprises vertically upstanding and longitudinally extending side walls 16, and 17 provided .on the bottomv edges thereof with a supporting `base 18. Anv

upright `laterally extending wall 19 is interconnected between the vertical front edges of side walls 16 and 17 and is provided at the top thereof-with ,a ledge 21 extending horizontally outward of the frame at ,substantially at right angle to wall 19,. The upper surface of the ledge 21 provides a support for the stationary clamping die 12 ywhichis secured in place thereon as by means of countersunk screws 20 or the like. The front edge of the ledge 21 forms an abutment portion which -is engageable bythe inner or reary abutment edge of the carrier plate 14a when the wing 1S is in its initial lposition as shown in Figs. 2 and 4.

A 'anged supporting plate 22 extending horizontally and laterally vacross the frame 11 is attached to side walls 116 and 17 adjacent the rearward vertical edges thereof and substantially midway between the base and topv longitudinal edge of said walls.

Anelongated channel 23 of a substantially U-shaped cross-sectional shape has one end thereof supported on the horizontal leg 24 of flanged plate 22, being secured thereto by suitable screws 24a or the like. Channel 23 extends longitudinally to ,and horizontally within frame 11 ,being equally spaced from the side walls 16 and 17. The oppositey end ofthe channel `23 extends through an opening 26 formed in front wall ,19. and the extremity `thereof is provided withvan outwardly extending `lip or flange 27 which is arranged to extend into a shallow recess 28, such flange being secured therein and to wall 19 by means of screws 29.

Additional rigidity Aand alignment for the side walls maybe provided by means of a laterally extending tie bar 31 (Figs. 2 and 3) having threaded ends projecting table 3.3 has one end thereof secured to the ledge 21 and-its other or rearward end resting upon a support bar 34. The table 33 supports the workpiece W as the latter is passed into the machine between the die members 12 and 13. The table 33 may be provided with any suitable guide means on its upper surface to assist the operator in correctly aligning the workpiece to be fabricated.

The anvil die 13 is supported upon and actuated by a carrier 35 which is shown as being a substantially U- shaped member having a laterally extending die support or block 36 to which the anvil die is bolted or otherwise suitably connected and a pair of laterally spaced arms 36a extending longitudinally along and within the frame adjacent side Walls 16 and 17. The carrier is pivotally attached to the side walls by means of pivot pins 37 eX- tending through cooperating bosses 38 and 38a which are formed respectively on the free ends of arms 36a and the side walls 164 and 17. The pivot pins 37 have threaded outer ends engaged by retaining nuts 39. The carrier 35 is swung about the axes of the pins 37 by means to be presently described to bring the anvil die 13 into cooperation with stationary die 12 to clamp the workpiece W therebetween.

The front end of the carrier 35 is slidably guided between bearing plates 46, Fig. l, attached to the side walls 16 and 17 of the frame 11 and extending substantially in parallel vertical spaced relationship thereto. Adjustment screws 46a in threaded engagement with side walls 16 and 17, extend laterally therefrom and telescope into and support bearing caps` 47a which are slidably engaged by bearing plates 46 and provide means to obtain lateral adjustment for the carrier 35 and attached anvil die 13 relative to the stationary die 12.

The carrier 35 may be actuated by any suitable power means, and in the present embodiment, a double-acting fluid pressure motor 41, Fig. 3, is provided for this purpose and has its cylinder 41a attached to the upstanding side leg 40 of the channel structure 23. The motor 41 is provided with a piston rod 42 which is attached to a bifurcated lever 43 and is reciprocally movable by the piston 42a. The bifurcated lever 43 is keyed or otherwise suitably connected to a rock shaft 45 extending transversely between the side walls 16 and 17, and which is pivotally supported in bushings 44 mounted on said side walls.

A pair of levers 47, Figs. 1 and 4, are xed on the rock shaft 45 adjacent the ends thereof and provide this shaft with axially spaced arms 48 which are pivotally connected to the arms 36a of the carrier 35 by means of the links 49.

Motive fluid to actuate the fluid pressure motor 41 is supplied thereto by conduits S1 and 52 connected with opposite ends of the cylinder 41a and leading from a combined pump and reservoir unit 54. A suitable pump located in the housing of the unit 54 is driven by an electric motor 55, Fig. 2. The delivery of the motive :Huid to the cylinder 41a and the return of the uid from the cylinder to the unit 54 is controlled by suitable valve means (not shown) of a conventional form.

The wing which actuates the bending die 14 comprises a box-like body having an elongated, laterally extending, ilat plate portion 60, Figs. 4,5 and 6, which extends across the front of the frame 11. The wing is provided at its ends with a pair of projecting support arms 61. Each of the arms 61 is provided with a suitable bearing 63 at its outer end by which the wing 15 is pivotally mounted on the side walls 16 and 17 of the frameby means of pivot pins 64. The pivot pins are located substantially coaxially of the anvil die 13, Figs. l and 2, so that the wing may be swung upwardly and forwardly of the anvil die in a manner to produce a substantially tangential rocking movement of the bending die 14 on the anvil die.

Formed integrally with the rear lateral edge of plate 60 and extending downward therefrom substantially at a right angle thereto is a back plate 65, having a plurality of laterally spaced, elongated, hollow spring honsings 67, Figs. l and 4, defining spring chambers 68 which extend longitudinally therethrough and connect with recesses 69 in plate 60. A bearing plate 71 is inserted within each recess 69 with the upper portion thereof extending above the top surface of plate 60. A suitable spring, such as coil spring 72 is disposed within each spring chamber 68 engaging bearing plate 71 and on adjusting screw 73 threadably disposed in the opposite end of housing 67 provides a means for changing the force exerted upon bearing plate 71 for a purpose to be hereinafter described.

Integrally formed on each side'of the plate 60 is a vertical wall 74, Figs. 5 and 6, having an upstanding and horizontally extending rail portion 74a spaced above the plate 60, and defining therebetween a guideway 75 for the reception of a die carrier plate 14a'.

The die carrier plate 14a is slidably supported within guideway 75 by the aforesaid spring-pressed bearing plates 71 and bearing blocks 77 attached to the upper surface of plate 60 adjacent to and parallel with rails 74a. The rear lateral edge of the die carrier plate is provided with a beveled flange 78, Fig. 4, that is arranged to engage the underside of lip 79 formed on the ledge 21 of front wall 19 to assist in supporting and correctly positioning the carrier plate 14a when the wing is in its rest or initial position as shown in Figs. 2 and 4.

A shallow groove 84, Fig. 6, is formed on the underside of carrier plate 14a adjacent each transverse side edge of the carrier plate beginning at the front lateral side of said plate and extending rearwardly thereof to substantially midway of each transverse side. An elongated rack 86 is inserted within each groove 84 and attached to plate 14a by means of countersunk screws 86a or the like, and then extends downwardly therefrom such that the teeth of each rack extend into and are exposed within an elongated opening 89 formed on each side of plate 60 directly therebelow. An elongated, laterally extending plate 81 is attached to the front lateral edge of plate 60 by means of bolts 82, and extends above the plane of the upper surface of plate 60. Adjustment screws 83 having threaded engagement withthe plate 81 extend through the latter into the guideway 7S to engage the die carrier plate 14a and position the latter plate and the attached bending die 14 relative to the anvil die 13. A retainer plate 83a may be attached to each rail portion 74a of wall 74 such that it overhangs the guideway 75 and is slidably engaged by an edge of the carrier plate 14a. The plates 83a retain the carrier plate 14a in the guideway 75.

The wing 15 is power actuated to carry the bending die 14 upwardly and forwardly of the anvil die 13 preferably by means of a double acting fluid pressure motor 85, Figs. l and 2, having its cylinder 85a secured within channel 23 of frame 11 by means of-collar members 87 attached to each end thereof and secured to the bottom rail 88 by means of screws 87a or the like. The motor 85 may be spaced above the bottom rail 88 of channel .23 by means of block 91 to enable the linkage mechanism interconnecting the motor 85 and wing 15 to move freely within channel 23.

The piston rod 92 of motor 85 is threadably attached to a link block 94, being retained therein by means of set screw 95. The link block 94 is slidably supported upon elongated, longitudinally extending, and opposed guideways 96 disposed in channel 23 and formed with longitudinally, laterally extending tongues 97 engaging in similarly shaped grooves 98 in the bottom portion on each side of the link block 94.

A pair of curved links 101, Figs. 2 and 3, have their inner or rear ends located on opposite sides of block 94, and are pivotally connected to the latter by a pivot pin 94a. The links 101 extend along channel 23 and have :their outer or forward ends pivotally connected to box 102 carried by back plate 65 of wing 15.

Motive uid to actuate motor 85 is supplied thereto and returned therefrom by means of conduits 104 and 105, Fig. 3, attached to opposite ends of cylinder 85a by umana of suitable fittings 106 and 107. The conduits r1,04 and l105 connect the motor 85 in circuit with the pump and reservoir unit 54 through a suitable control valve 108.

, In the present apparatus, the control valve 108 is a conventional solenoid-actuated four-way valve electrically controlled vby means of push-button switches 104a and 105a.

When the switch 104a is actuated, the valve 108 is shifted to a setting by which motive fluid is supplied from the unit 54 to the motor 85 through the conduit 105 to cause an upward power stroke of the wing 15 and by which expended motive fluid is returned to the unit 54 through the conduit 104. Similarly, when the switch 105g is actuated the valve 108 is shifted to a setting by which motive fluid is supplied tothe motor 85 through the conduit 1,04 to produce a return stroke of the wing 15 and by which expended motive fluid is then returned to the unit 54 through the conduit 105.

According to the present invention the die carrier plate 14a can'be positively driven in a translatory direction relative to the wing 15 during swinging of the latter about the anvil d ie ,12. The power actuation of the carrier plate is preferably produced by means of a double acting fluid pressure motor 111, Figs. 5 and 6, which is also operatively connected with the pressure fluid supply unit 54 In this manner, die carrier plate 14a may be actuated substantially simultaneously with the movement of the wing or at a predetermined time relationship thereto in a manner explained hereinafter.

More specifically, motor 111 comprises a cylinder 111:1

rigidly mounted upon the lower portion of support arm 61 on the right side of the wing 15, as depicted in `the views of Figs. 1, 5 and 6, and provided with a reciprocably movable piston rod 114. The outer end of the piston rod 114 is threadedly attached to a substantially rectangular carrier block 116, adjacent its lowerend.

An elongated rack 117 has one end thereof rigidly attached to the block 116 and lying in a channel 118 formed in the top portion of the block. The rack extends rearwardly from the block 116 and is slidably supported longitudinally thereof in a guideway 119 formed in the laterally extending leg V121 of a bracket 122 which is mounted on the wing 15 adjacent the motor 111.

A laterally extending shaft 124 is pivotally supported within wing 15 by means of bearings 125 mounted in walls 74. A gear sector 127 attached to the right hand extremity of shaft 124 is arranged to mesh with rack 117 and is pivotally movable thereby to rock shaft 124.

A pair of gear sectors 131 are mounted upon shaft 124 being secured thereto b y means of lock bolts V131e and extend outwardly thereof and into the openings 89 formed in plate 60 wherein they mesh with the racks 86 attached to each side of carrier plate 14a. As is shown in Fig. 5 said gear sectors are formed with a larger radius and circumferential length relative to gear sector 127, but it is contemplated that said gear sectors may be substantially similar to each other or gear sector 127 may be, if desired, the larger. Although the gear Sectors 127 and 131 are shown to be attached to shaft 124A in a diametrically opposed relationship, it is understood that said gear sectors may extend outwardly from the shaft in the same radial direction or at any other predetermined angular relationship therebetween.

Through actuation of lluid pressure motor 111, the rack 117 is reciprocably driven to pivot gear sector 127 and attached shaft 124. The pivotal movement of shaft 124 is transmitted through the interconnected gear sectors 131 and rac-ks S6 wherein the die carrier 14a and attached bending die 14 are positively reciprocably driven in a translatory direction within the wing 15.

Motive fluid to actuate motor 111 is applied thereto and returned therefrom by means of a conduit system comprising conduits 133 and 134, Figs. 1 and 3, connected to opposite ends of the cylinder 111a and extending upwardly therefrom, being supported adjacent Athe ends thereof by bracket 137 carried by wing support arrn`61. Lengths of flexible tubing 138 and 139l are attached to the opposite ends of conduits 133 and 134, respectively, and extend substantially longitudinally along the frame wherein the opposite ends thereof are attached to conduits 141 and 142 carried by bracket 143 attached to side wall 17 of the frame 11. The opposite ends of conduits 141 and 142 are connected in circuit with pump and reservoir unit 54 by means of solenoid- actuated'valve 1,09, which is similar in structure to valve 108.

Electrical control devices, such as push-button switches 109:1 and 110 interconnected between va1ve,109 and a source of electrical energy provide a means to actuate said valve 109 and control the flow of motive iluidto and vfrom the motor 111.

When the switch 109a is actuated, the valve 109 Iis shifted to a setting by which motive lluid is supplied from the unit 5,4 to the motor 111 through the conduit 142, tubing 139 and conduit 134 to cause an inward stroke of the `die carrier plate 14a or toward the back wall 65 of the wing 15. Expended motive fluid is also returned to the unit 54 through conduit 133, tubing 138 and conduit 141. Similarly when switch is actuated, the valve 109 is shifted to a Setting by which motive fluid is applied to the motor 111 through conduit 141, tubing 133 and conduit 133 to cause an outward stroke of the die carrier plate 14a and by which expended fluid is returned to the unit 54 through conduit 134, tubing 138 and conduit 142.

In the embodiment of Figs. 7 and 8, the rack and gear sector drive mechanism is replaced by a pressure iluid motor 171, preferably of the double acting type having one end of its cylinder 171a attached to a flange 172 depending from the vertical rear wall 65 of wing 15. The piston rod 173 vof motor 171 is actuated by its piston 174 and has its outer end pivotally connected to an elongated arm 176 by pin 176g and which arm extends downwardly `from the underside of die carrier 14a and projects through an elongated slot 177 formed in plate 60 of the wing. Suitable conduits 178 and 179 connected to opposite ends 0f the motor cylinder 171a and connected in the pressure fluid circuit in a manner substantially Similar to conduits 133 and 134, respectively, of the motor 111 of the embodiment of Figs. 1 6, provide for the transmission of motive iluid to and from the pump and reservoir unit 54 and the motor cylinder 171a for actuation of the motor 171.

Although only one motor 171 is shown, it is understood that several or more, as is desired, may be provided to actuate the diecarrier 14a and attached bending die 14. The die carrier drive mechanism of Figs. 7 and 8 is preferably utilized whenever a longer stroke of the bending die is desired.

The dies utilized .in fabricating the workpiece W may be of any desired size and configuration. In the present instance wherein the workpiece W -is in the form 0f a metallic sheet having a ilat web 3 extending between elongated and vertically upstanding flanges 4, and a portion thereof is to be bent at an angle and related to the remaining portion by a defined radius, the stationary 0r clamping die 12, Figs. 3 and 4, comprises a substantially horizontally extending rectangular ilat plate with flanges 153 of suitable hardness formed on the sides thereof.

The anvil die 13 is substantially L-shaped cross-sectiona-lly, being formed with a forwardly extending curved surface connecting yon ,its lower end with a ilat clamping surface 156. A narrow band of hardened material 157, Fig. l, may be rigidly attached to the edge of each side of this die, the outer surface of which is coextensive with the curved surface 155.

The bending die 14, Figs. l and 3, comprises alaterally extending flat web 159 interposed between side flanges 161, and die inserts l162, substantially L-shaped in cross section, disposed within suitable recesses formed at the juncture of the'web 159 and flanges 161.,

The function ofthe above defined machine will now be explained 'by describing a typical cycle of operation inthe fabrication of workpiece W utilizing the drive mechanism for the die carrier 14a as shown in Figs. 1-6.

It will be assumed that at the beginning of the operating cycle, the wing 15 is in the rest position shown in solid lines in Fig. 4, and that it is to be swung upward to the position'shown in dotted lines and thereafter returned to its original rest position. i

The workpiece W is placed upon table 33 and inserted between the clamping die 12 and anvil die 13 such that the webV 3 is supported on the flat upper face of the clamping die 12 and on the web 159 of bending die 14, and the flanges 4 thereof lie juxtaposed and exterior to the bands 157 of die 13 and upon the inserts 162 of the bending die.

The electric motor 55 is connected to a suitablesource of electrical energy through suitable switch means (not shown)v of a conventional form wherein the pump and reservoir unit 54 is powered. The aforesaid control valve means (not shown) is then actuated whereby motive uid iiows through conduit 51 to the rearward end of anvil die carrier motor 141 to force the piston 42a and attached shaft 42 to the right as viewed in Fig. 3 and-to `return expended motive fluid to the unit 54 through conduit 52. The bifurcated lever 43 and attached shaft 45 are rocked clockwise as viewed in Fig. 4 to pivot the carrier 35 clockwise about its pivot pins 37 and clamp the web 3 of the workpiece W between surface 156 of anvil die 13 and plate portion 152 of stationary die 12. Push-button switch 104e is then actuated to shift valve 108 to a setting wherein motive fluid is supplied from unit 54 to the rearward end of motor cylinder 85a through conduit 105 and expended motive uid is returned to unit 54 through conduit 104. Upon actuation of motor S the wing 15 is swung upwardly and forwardly about pivot pins 64 toward its dotted line position shown in Fig. 4. The web 3 of the workpiece W is bent upwardly out of its original plane by the cooperating web 159 of the bending die 14 and the curved surface 155 of the anvil die 13. Each flange 4 of said workpiece is bent upwardly within its own plane by the cooperating bands 157 of die 13 and flanged inserts 162 of the bending die 14. During this swinging of the wing the bending die 14 is powered to travel around the curved surface 155 of the anvil die with a true rocking motion substantially free of any slippage therebetween and is held in positive pressure engagement with the workpiece by means of the spring pressed bearing plates 71 engaging the underside of die carrier plate 14a.

To provide a translatory or reciprocating motion for the bending die 14, the die carrier motor 111 is actuated to move the carrier plate 14a and attached bending die 14 along the guideway 75 and parallel to the wall 60 of the wing 15 while the latter is swung upwardly and forwardly of the frame 11.

Actuation of motor 111 may be substantially simultaneous with that of wing motor 85 or at a predetermined timed relationship relative thereto as will be more fully explained hereinafter. In the present operational cycle the motor 111 is actuated substantially simultane- 'ously with the actuation of wing motor 85.

Push-button switch 109er is actuated to shift valve 109 and connect conduit 142, exible tubing 139 and conduit 134 to the pump 54 wherein motive fluid is supplied to the rearward end of motor 111. The piston 111b of said motor is forced to the left as viewed in Fig. 5 wherein the piston rod 114 and attached rack 117 are also driven to the left within guideway 119 of bracket 122 whereby the operatively connected gear sector 127 and shaft 124 are pivoted clockwise. Gear sectors 131 attached to shaft 124 are thence pivotally driven clockwise to move the racks 86 operatively connected thereto and attached die carrier plate 14a to the right within guideway 75 or in a direction transverse to the longitudinal axis of the wing 15. The bending die, as a result of the swinging of the wing and translatory movement of the die carrier plate 14a, is carried tangentially about the curved portion 155 of the anvil die 13 without any substantial slippage therebetween which might cause a scoring o1' tearing of the workpiece.

Upon the completion of the bending portion of the cycle, the motors S5 and 111 are reversely actuated to return the wing 15 and bending die 14 to their original rest position as shown in full lines in Fig. 2 in which the abutment edge of the carrier plate 14a is engaged against the abutment portion of the ledge 21. To accomplish this, the push-button switches 105a and 110 are actuated to shift valves 108 and 109 and supply motive fluid from the pump and reservoir unit 54 to the forward end of each motor 85 and 111, and to connect the rearward end of each motor to said unit 54 for the return of expended iluid. Motive fluid is supplied to the forward end of wing motor 85 through conduit 104, and to the forward end of die carrier motor 111 through conduit 141, flexible tubing v13E and conduit 133. Expended fluid within the rearward end of motor 85 is returned to the unit 54 through conduit 105 and in like manner expended iiuid within the rearward end of motor 111 is returned to the reservoir through conduit 134, exible tubing 139 and conduit 142.

The reverse actuation of the motor 85 swings the wing 15 downwardly to its original position as shown in full lines in Fig. 4. The reverse actuation of motor 111 drives the die carrier plate 14a toward the front of the wing 15 in a manner such that the ange 78 on said plate clears the front edge of the clamping die 12 and ledge 21 and slidably engages the underside of lip 79 formed on the front edge of the latter. The reverse movement of the wing and die carrier plate 14a also assist in separating the bending die 14 from the fabricated workpiece.

It m-ay also be desired to provide an ironing eiect on the workpiece W during the bending cycle. This may be accomplished by the valves 108 and 109 to control the ow of fluid therethrough whereby the die carrier motor 111 is actuated slightly before or after the actuation of the wing motor 8S. Additional ironing of the workpiece may also be provided by a rapid reverse actuation of valve 109 by means of push buttons 109a and whereby the motor 111 reversably jogs'the bending die during the stroke of the wing.

When the wing 15 and die carrier plate 14a have been returned to their original position, the anvil die carrier motor 41 may be reversely `actuated through conduit 52 wherein the carrier 35 is pivoted upward to permit removal of the workpiece W.

In the embodiment of Figs. 7 and 8 the bending die carrier motor 171 may be connected in circuit with the pump and reservoir unit 54 through valve 109 and conduits 178 and 179 and is directly operable upon the die carrier plate 14a to reciprocally move the attached bending die 14 in a manner similar to that described hereinabove.

Having described several embodiments of the present invention, it is realized that the objects and advantages as set forth herein have been attained, and that the present invention is susceptible of various modifications, combinations and improvements which are within the scope of the appended claims.

Having thus described my invention, I claim:

l. In a metal bending machine, a frame, a pair of opposed upper and lower cooperating clamping members on said frame and adapted to receive a workpiece therebetween, means for causing relative closing and separating movement between said clamping members for clamping or releasing the workpiece, one of saidpclamping members being an anvil die having a convexly curved 9 portion, a wing comprising a pair of support arms located at the sides thereof and a plate portion extending between said arms and having opening means therein, said wing having spaced guide portions providing a guideway extending across the `upper surface of said plate portion, horizontal pivot means pivotally connecting said arms with said frame for swing of said wing around said curved portion of the anvil die, means for swinging said wing, a die carrier swingable with said wing and also having a translatory movement along said guideway relative to the wing, a bending die on said carrier and cooperating with said curved portion for bending the workpiece around the latter, said bending die having a tangential rocking movement against and around said curved portion by the combined swinging of said wing and translatory movement of said carrier along said guideway, a shaft, means mounting said shaft on the underside of the plate portion of said wing for pivotal movement, a power motor device mounted on said wing, power transmitting means connecting said motor device with said shaft for imparting pivotal movement thereto, and power transmitting means extending through said opening means and effective between said shaft and carrier for causing the translatory movement of the latter in response to the pivotal movement of said shaft.

2. In a metal bending machine, a frame, a pair of opposed cooperating clamping members on said frame and adapted to receive a workpiece therebetween, means for causing relative closing and separating movement between said clamping members for clamping or releasing the workpiece, one of said clamping members being an anvil die having a convexly curved portion, a wing including a support portion having a guideway thereon, means pivotally connecting said wing with said frame for swinging around said curved portion of the anvil die, means for swinging said wing, a die carrier swingable with said wing and also having a translatory movement along said guideway relative to the wing, a bending die on said carrier and cooperating with said curved portion for bending the workpiece around the latter, said bending die having a tangential rocking movement against and around said curved portion by the combined swinging of said wing and translatory movement of said carrier along said g'uideway, first rack means on said carrier, a shaft mounted on said wing for pivotal movement, a power motor device mounted on said wing and having a reciprocably movable member, second rack means connected with said reciprocably movable member, and gear members secured to said shaft and meshed with said rst and second rack means to produce said translatory movement of said carrier.

3. In a metal bending machine, a frame having thereon a ledge provided with an abutment portion, a first clamping die on said ledge, a second clamping die having closing and opening movement relative to said rst clamping die for clamping or releasing a workpiece, means for supporting and actuating said second clamping die, a convexly curved anvil means associated with said second clamping die, a wing comprising a pair of support arms and a plate portion extending between said arms and having opening means therein, said wing having spaced guide portions providing a guideway extending across the surface of one side of said plate portion, pivot means connecting said arms with said frame for swinging of said wing around said anvil means, means for swinging said wing, said wing having an initial position with said plate portion extending laterally away v from sad ledge, a die carrier swingable with said wing and also having a translatory movement along said guideway relative to said wing, a bending die on said carrier and having a work-engaging portion cooperating with said anvil means for bending the workpiece around the latter, said carrier having an abutment edge engageable with said abutment portion when said wing is substantially in said initial position, the work-engaging portion of said bending die having a tangential rocking movement against and around said anvil means by the com- 4bined swinging of said wing and translatory movement of said carrier along said guideway, a shaft, means mounting said shaft on said wing on the other side of said plate portion for pivotal movement, motion transmitting means extending through said opening means and elective between said shaft and said carrier for causing the translatory movement of the carrier, and power motor means mounted on said wing and operably connected with said shaft for producing the pivotal movement of the latter.

4. A metal bending machine as dened in claim 3 in which said power motor means is double acting and is effective to produce a power actuated re-engagement of said abutment edge with said abutment portion upon return swinging of said wing to its initial position.

References Cited in the le of this patent UNITED STATES PATENTS 2,482,617 Green Sept. 20, 1949 2,596,848 Green May 13, 1952 2,636,537 Redman Apr. 28, 1953 2,638,142 Green May 12, 1953 FOREIGN PATENTS 711,502 Great Britain July 7, 1954

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