US2022915A

US2022915A - Metal bending machine

Info

Publication number: US2022915A
Application number: US747366A
Authority: US
Inventors: Otto H Jensen
Original assignee: Ternstedt Manufacturing Co
Current assignee: Ternstedt Manufacturing Co
Priority date: 1934-10-08
Filing date: 1934-10-08
Publication date: 1935-12-03
Anticipated expiration: 1952-12-03
Also published as: DE651673C

Description

Dec. 3, 1935. o, JENSEN 2,022,915,

- METAL BENDING MACHINE Filed Oct. 8, 1934 v Sheets-Sheet 1 INVENTOR. Or'ro H c/ENSEN ATTORNEYS.

Dec. 3, 1-935. 0. H. JENSEN METAL BENDING MACHINE Filed Oct. 8, 1934 7 Sheets-Sheet 2 v JNVENTOR. Orro h. c/ENSE/Y Dec. 3, 19 35. 0. H. JENSEN r METAL BENDING MACHINE Filed Oct. 8, 1934 7 Sheets-Sheet 4 INVENTCR. Orro H JENSEN ATTORNEYS.

Dec. 3, 1935, O JENSEN METAL BENDING MACHINE Fi-led Oct 8, 1934 7 Sheets-Sheet 5 lNVENTOR. 0770 c/ENSE/Y ATTORNEYS Dec. 3, 1 935. I o, JENSEN 2,022,915

METAL BENDING MACHINE Filed Oct. 8, 1934 7 Sheets-Shet s Q L/ a- 23 87 86 d J h 79 JNVENTOR.

Urro H c/E/V-SE/Y ATTORNEYS.

35- o. H. JENSEN METAL BENDING MACHINE Filed 0012.8 1934 7 Sheet-Sheet '7 INVENTOR. Orro f1 c/ENJE/Y Patented Dec. .3, 1935 UNITED STATES PATENT OFFICE aogasis METAL BENDING momma Otto H. Jensen, Detroit, Mich assignor to Ternstedt Manufacturing Company, Detroit, Mich., a corporation of Michigan Application October 8, 1934, Serial No. 747,366

11 Claims.

, center coincident with the geometrical center of the die to form a U-shaped frame. In such a case the die is formed so that all points along the working face along which the ironer travels are substantially equidistant from the center of the, die or sufliciently close that as the die rotates the hill which. the ironer isrequired to climb has a suffilciently low grade that the force component which acts tranversely of the ironer is insufficient to destroy the ironer or create enough friction between the ironer and the work to destroy the work.

In the case of a garnish molding foran automobile window opening, in particular those moldings which approximate a rectangle, a die is required for bending such moldings which has the corners of the working face, for example, spaced a much greater distance from the geometrical center of the die than the portion of the face midway of two successive corners.-

In the bendihg of the rolled metal channel section to form the garnish molding, particularly in the case of the garnish molding for the front door, rear door and rear windows of the vehicle body which have relatively long sides compared with the garnishmolding for the rear quarter window, this requires the ironer upon sliding along thes long sides to climb a relatively steep bi l. This causes a relatively large component of force" to act transversely of the ironer which either breaks off the arm for the ironer or increases the friction between the ironer and the garnish molding to such an extent that the work or a large share of it is ruined. In such a case about a rotating die where certain portions of the forming face of the dieare spaced a relatively greater distance from the center of the die than other portions of the forming face of the die. This object has been attained by so constructing the machine that the rotating die upon presenting any of its face to the ironer which would require the ironer to travel a steep hill in case the die were rotated on a fixed center coincident with the center of the die, is backed away from the shoe to a sufficient extent to decrease the force com-.

ponent acting transversely of the ironer sufficiently so that neither the ironer nor the work is destroyed. More particularly this is achieved by mounting the die so that its geometrical center does not at all times coincide with the center of rotation of the die. The die is arranged so that its geometrical center recedes from the ironer whenever theironer is required to climb up one of the long sides of the die, that is, required to travel from a point on the forming edge of the die which is close to the geometrical center of the die to a point which is more distant from the center of the die, and which travels toward the ironer whenever the ironer is required to travel down along side of the die, that is,-whenever the ironer travels from a point on the periphery of the die distant from the geometrical center of the die to a point less distan Another object of this invention is to produce a machine that will bend a single length of a metal, which may be in the form of a channel section, into a closed frame in a single operation.. It is also an object of this invention to produce a machine that will bend a metal strip which may be in the form of a channel sectioninto a closed frame, one of the sides of which has a concave bend, that is, curves inwardly toward the geobeen'achieved by providing a clamping device which is automatically set in operation during the rotation of the bending die to clamp the work against the concave edge of the die after a portion of the work has-been bent and before the remaining portion of the work is bent.

A further object of this invention is the production of a machinethat will bend a metal strip, which may be in the form of a-channel section, 40 into a frame so that the ends are overlapped thereby permitting the frame to be sprung outwardly with the ends of the frame in abutting relation to facilitate being welded or otherwisefixed together. v

In the drawings:

Fig. 1 is a plan view of the bending machine showing the die in starting position. r

Fig. 2 is a side elevation of the machine with a diagrammatic showing of the air lines. 7

Fig. 3 is a fragmentary longitudinal sectional view of the machine. 4 v

Fig. 4 is a detail section through the main air cylinder'.

Fig.5isaviewalongthelineHofI'lg.4. 66"

Figs. 6 and -'l are details of the ironer and ironer support arm.

Fig. 8 is a top view of the rotating table with the die support plate removed.

Figs. 9 and 10 are detail sections along the lines 99 and 9-|0 of Fig. 8.

Fig. 11 is a detail of the-work clamp on the die.

-Fig. 12 is a section along the line |2-|2 of Fig. 11.

Figs. 13, 14, 15 and 16 are detail views of the clamping arrangement for holding the work against the face of the die opp site that where the work is clamped to the die.

Figs. 17 through 20 show the work being bent about the die and the relative positions occupied by the die during the bending operation.

Referring more particularly to the drawings I the machine comprises a base I which supports a fixed post 2. The post 2 has rotatably mounted thereon a table 3. The rotating table 3 is mount- I ed on the post 2 and supported by the thrust bearing 4 which rests upon the collar 5. The base I is provided with a plurality of circumferentially spaced brackets 6 each of which carries a yoke I each of which is adjustable radially inwardly and outwardly by an adjusting screw 3. Each yoke l carries a roller bearing 9. The rotating table 3 is providedwith a depending circumferential flange H) which carries a circular track The roller bearings 9 have a rolling engagement with themitted through a suitable reduction gear arrangement Hi to the driving worm It. The driving worm l6 meshes with the worm gear I I which may be bolted or otherwise suitably secured to the rotary table 3.

Inasmuch as one of the objects of the invention is attained by having the die travel toward and away from the ironer during different periods of the rotation, to this end the die I3 is secured to a reciprocating support plate |.9 in any suitable manner such as by the screws 20. The support plate I9 reciprocates diametrically of the rotating table 3 in a guideway generally designated 2|.

The parallel side edges of the guideway are provided with a plurality of inclined roller bearings '22 which have a rolling engagement with the beveled edges 23 of the die support plate l9. The

. engagement of the inclined roller bearings with the beveled edges 23 of the slide l9 takes up any side thrust .and likewise retains the slide plate in the guideway 2|. The rotating table is also provided along each edge of the guideway 2| with the rollers 24 which have a rolling engagement with the bottom face of the support plate l9 and support the same upon the table 3.

For reciprocating the slide l9 diametrically of the rotating table 3, the fixed post 2 has splined or otherwise fixed on its upper end a support member 25 provided with the parallel tracks 26 forming a guideway in which a block 28 carrying an upstanding pin 29 is adjustably mounted. A

block 30 is swivelly mounted on the pin 29 and slidablyengages in a guideway formed by two 34 (Fig: 10) is meshed with the worm gear 35 carried on a shaft 36 havinga square end. The square end of the shaft may be gripped with a suitable'wrench and the worm gears 34, 35 turned; this rotates the screw 32 to adjust the block 28- 5 and pin 29 toward and away from the center of rotation of the table 3 for purposes which will be explained below. I

The die I9 is designed for the bending of a strip of metal of channel section into a garnish molding-for the rear window of an automobile body, but it is understood that this die might be of a different shape and arranged to bend a strip of metal other than a channel section and into a frame having a periphery different from that shown. The garnish molding is formed from a single strip of metal 31 which initiallyis a single straight length having a channel cross section as indicated in the dotted lines Fig. 13. After the straight strip 31 has been bent into the form 20 of a garnish molding frame, the ends of the strip are preferably welded or otherwise fixed together. To facilitate the welding of these ends together it is desirable that the spring tension in the bent garnish molding frame should be such as to urge 25 these ends toward, rather than away from, each other. For this purpose, as well as for the purpose of permitting the single length of metal to be bent into a frame in a single operation, the die is formed so that at the end of the bending 30 operation the adjacent ends of the frame overlap. To attain this result the die I8 is formed with a recess 38 so that the working face of the die, as at 39, at the beginning of the bending operation is inset from the working face of the 35 I die as at 49 at the end of the bending operation.

parallel tracks 3| depending from the bottom face 1 of the slide l9. Theblock 29 may be adjusted along the tracks 26 by means of the adjusting screw 32. The adjusting screw 32 is journaled in the member 25 as at 3'3 andprovided at the outer end with a worm gear 34. The worm gear The arrangement for clamping theend of the work into the die is shown in detail, Figs. 11 and 12. The die I8 is provided with a recess 4| at the beginning of the working edge 39. This recess 40 has slidably mounted therein a block 42 provided with an oblong opening 43 which is arranged to receive the eccentric or cam portion 44 of a pin 45 rotatably mounted in die l8 and in the cover plate 46. When' the pin 45 is turned the engage- 45 ment of the cam 44 in the oblong opening 43 causes the block 42 to move from the front to the back of the recess 4| or vice versa. The cover plate 49 covers the recess 4| and is secured to the '(lie |8 by the screws 41. The outer edge 48 of the clamping block 42 is shaped to conform to the channel section of the garnish molding. The outer face of the recess 4| carries the block 49 which is shaped to correspond with the face 48 of the block 42. The block 49 is secured to the 55 'die l9 by any suitable means suchas the screw 50. A suitable lever handle'5l is mounted on the square end of the pin 45. At the beginning of the bending operation the strip 3'l'is slid along .the contour of which corresponds to the inner contour' of the channel section of the garnish molding,- is arranged to engage the inside face of the channel section strip. This ironer 52 is riveted or otherwise secured in the yoke 53. The l yoke 53 is provided along its top and bottom faces with the

pins

94 and 55 which are journaled in 58. The arm 58 is pivotally mounted as at 59 on a suitable support 69 carried by the base I of the machine. The pivoting of the arm 58 at 59 permits the ironer 52 to swing inwardly and outwardly as the die rotates. The arm 58 is backed up by a plunger 6|, the end of which carries a,

yoke 62 on which is rotatablymounted a roller 63. The roller 63 is arranged to engage the arm 58. The plunger 6| (Fig. 4) is secured at one end to the piston 64 which is reciprocably mounted in the cylinder 65. The cylinder 65 is provided with an air line 66 through which compressed air is admitted into, and discharged from, the cylinder 65. 'The admission of compressed air into the cylinder 65 projects the plunger 6| causing the roller 63 to bear against the arm 58 and thus hold the ironer yieldably against the work which is held against the die by the ironer.

The end of the cylinder 65 through which plunger 6| passes is provided with a plurality of relatively small cylinders 61 having pistons 68. Each piston 68 has a piston rod 69 which yieldably engages the face of the piston 64. The cylinder housing 65 is provided with a suitable header 16 having a circumferential groove H which is continuously connected with the main air feed line described below by air line I50 and serves as a conduit for connecting the small cylinders 61 at all times with the main air line. Inasmuch as the small cylinders 61 are at all times connected with the main air line there is a constant air pressure exerted against the small pistons 68 which causes the rods 69 to exert a constant, thrust against the main piston 64. Due to the fact that the cylinders 61 and pistons 68 are relatively small compared with the large cylinder 65 and large piston 64, the main piston 64, when compressed air is admitted through the inlet line 69, easily overcomes the small thrust of the pistons 68 and thus throws the plunger 6I to the left or toward the die. When the air is exhausted from the main cylinder 65 through the line 66, the small pistons 68 acting through the rods 69 move the main piston 64 toward the right thus withdrawing the plunger 6 I This permits a suitable coil spring I56 to withdraw arm 56 and the ironer 52 from the die. The pistons 68 and cylinders 61 can be made fairly small because the only work they perform is overcoming the friction of the main piston 64 in the cylinder 65 and the friction of the plunger 6I in its supporting bear- It will be noted that the working face of the die I8 along one side as at 12 is concave, that is, curved inwardly toward the center of the die. The face 12 of the die is necessarily concave-because it is desired to have the lower edge of the garnish molding frame, into which the work is bent, curved inwardly. This inward curve of the face 12 of the die creates a new problem, namely; that of maintaining the bent work against this face as the ironer travels from this face around the end of the die and'back to the face 48' at the end of the bending operation. 1

. To this end thedie I8 has pivotally mounte thereon as at 13 a pair of arms 14 which carryat their outer ends a clamping bar 15. The

clamping bar 15 is arranged to engage the inside face of the work 31, as shown in Fig. 17, to hold the work flush against the curved end 12 of the die. Since the ironer travels along. the inner face of the work 31., Obviously the clamping bar .15 must not be in lowered clamping position until the ironer has passed the clamping bar.

ed upon the die as at 11 and backed up by the spring 18. This support member 16, as shown in the dotted lines, Figs. 13 and 15, engages under 5 an arm 14 to hold the clamping bar 15 in raised position. The outer end 19 of the pivoted support 16 projects beyond the edge of the die I8. After the ironer has passed beneath the clamping bar 15 and approaches the end of this bar, the ironer 10 engages the projecting end 19 ofthe support 16 swinging it from beneath the arm 14 to the full line position, Fig. 15, thus permitting the clamping bar 16 to fall by gravity into clamping engagement with the work as shown in the full lines 15 Fig. 13. The bar 15 is held ineclamping relationwith the work by the latch 86 pivoted as at 8| to the die and held iri latching engagement over the arm 14 by the spring 82. It will be noted, Fig. 16, that 20 the upper face 83 of the latch is inclined. The arm 14 of the clamping device has a handle pivotally mounted thereon as at 86. The handle 85 has a projecting arm 81 extending over the cam face 83 of the latch 88. The handle 85 25 is normally drawn towards the arm 14 by the coil spring 88, Fig. 13. To retract the clamping bar thehandle 85 is'first drawn back to the dotted line position indicated at 89. At this time the arm 81 of the handle 85, through the cam engage- 30 ment with the inclined face 83 of the latch 80, has thrown the latch to the disengaged position shown in Fig. 16. This permits the handle 85 to be drawn from the position shown in the dotted lines at 89 to the dotted line position 99, thus 35 swinging the arms 14 upwardly and retracting the clamping bar 15 to the raised and fully retracted position shown in the dotted lines, Fig. 13. The spring 18 now throws the pivoted support 16 to the dotted line position, Fig. 15, beneath the 40 arm 14 where it supports the clamping device in raised position. At this time the latch BIl is back in a position similar to that shown in Fig. 14 but beneath the arm 14 so that when the clamp 15 again falls down by the action of grav- 45 ity the arm 14 will strike the cam face 83 of the latch-'86 to throw it out temporarily and then permit'it again to snap back into latching engagement with the arm 14 to latch it in clamping engagement with the work. Although the power for running the machine may be supplied by an electric motor the machine is preferably air 'controlled. As shown in Figs. 1 and 2 the motor is connected to the driving member I3 ofthe clutch by the chain l4. The 55' driving member I3 is freely rotatably mounted upon the shaft 9i which is operatively connected with the driving worm I6 through the gear reduction arrangement I5. The driven member 92 of the clutch is keyed or 'splined on the shaft 9| B0 sothat it is slidable axially of the shaft. The driven member 92 is operatively connected in the groove 93 with a lever 94. The lever 94 has its lower end pivoted to a suitable support as at 95 and its upper endpivoted to a piston rod 96 65 as at I91. The piston rod 96 is connected to a ,matically in Fig. 2. The air lines are provided with three valves of a type well known to the trade. These valves are numbered I09, I09, and I I0. Valves I08 and I09 are manually controlled by lever handlesI II whereas valve H0 is mounted on the base I of the machine immediately be-.

low the depending flange I0 of the'rotary table 3. The depending flange I0 carries the circumferentially spaced cams I I2 and H3. These cams I I2 and H3 may be spaced ten degrees apart for purposes described below. Valve H0 is provided with an operating lever Ill having a roller II5 69 as above described, to return the main piston 2 at its outer end. During the rotating of the rotary table the earns H2 and H3 ride over the roller H4 thereby operating the valve IIO.

I The valve- IIO is connected to themain air line IN by a line H6 and with the cylinder 98 by line 1. The valve I09 is connected with line )IB by air line H8 and with line I" by a line II9.

A check valve I2I is mounted in line 1 between valve IIO andline II9 which permits the air to pass only in the direction of the arrow, that is, only from the valve I I0 to the air cylinder 98.

.Line H9. is connected to cylinder I05-by line I20.

will not be described in detail. Each of these presses down on handle III which operates valve valves is constructed so that air passes from the main airline and valve into any cylinderonly when the handle is depressed. As soon as the hand is removed from the handle I I I or the cam passesover the lever 4, the handle returns to raised position and the valves shut oif the main. air line and exhause the cylinders to atmosphere.

The operation of the machine is as follows:

.The starting position of the die is shown in Figs.

1 and 17. At this time the work 31 is clamped to the die as above described. The operator then I08. This permits air to pass through line I20 to cylinder I05 which actuates the piston and throws the valve lever I00 to, the right thus connecting main air. line. IOI ,with the line 05 permitting the compressed air to flow into the main air cylinder 65. This projects plunger 6| which in turn moves the ironer 52 against the work. The v operator next pressesdown on lever III for the valve I09 which permits the air to pass through line I 23 into cylinder 98 which,. acting through 1 piston 91 and clutch lever 94; engages the driven member 92 with the "driving'clutch. member. I3

thus causing the table 3 and the die to rotate.

The operator only need momentariiy'depress the lever handles III. As soon as the operator removes his hands frorn these levers the valve opens and permits cylinders I05 and 98 to exhaust to atmosphere.) However, the pistons in these [cylinders do not move backto their original position until compressed air is again fed into the opposite ends of the cylinders. This leaves the valve I02 in position so that the air line I M is connected with air line 06 and the clutch is retainedin engaged position by any suitable and well known locking arrangement, which may be a snap over'center spring, until air is again admitted to the cylinder to disengage the clutch.

As the die rotates the work is bent by the ironer around the die I8 as shown progressively in Figs. 5

' 1'7, 18, 19 and 20. When the die has rotated apreturns valve I02 to the position shown with line IOI cut off and line 66 from cylinder 05 now be- 15 comes an exhaust line which in conjunction with valve I02 and line I03 exhausts cylinder 65 to atmosphere. v w

This permits the small pistons 60 and plungers 64 and ironer to retracted position shown in Fig. 1. The rotation of the table is stopped after it travels approximately 350 or at any other point subsequent to the last bend around the end of the die and before it reaches the recess 38 because 25 otherwise the ironer while still pressed by the plunger 0|, would again reach the recess 38, jam into the work and destroy the work and injure the die.

After the ironer. has been retracted with the 30 table in the position shown in Fig. 20, the operator then depresses lever III for valve I09 which permits air to pass through line I23 into the cylinder 90 again engaging. the clutch'which rotats the table 3 and die I8. The cam II 2 next engages the roller H5 opening -valve IIO which permits air-to flow through line I I1 into cylinder 90 thereby disengaging. the clutch and stopping the machine at its original position shown in machine, an emergency arises requiring the machine to be stopped immediately, the operator can throw handle III upwardly thus operating valve I09 so that the air passes through check valve I22 through line II9 into line H1 and then into cylinder. thereby disengaging the clutch. At this time 'the air also passes through line I 20 into the cylinder I05 which throws the valve I02 to exhaust position permitting the air to exhaust from cylinder 65 through lines 66 and I03. Check valve I2I prevents the air from flowing from line H9 along line I" to valve IIO where it would be exhausted. During the normal operation of the machine, check valve I22 prevents the air-from flowing from line I I1 into line H9 and then into valve I09 where it would be exhausted to atmosphere.

'During the operation of the machine the table rotates as indicated by the arrows,.Figs. 17 to 20.

In 19 the ironer has just passed beyond the stop 19 and released the clamping bar I5 which 05 thereafter holds the work tightly against the. curved edge of the die.

As shown in Fig. 1 the geometrical center of the die I8 is concentric with the post 2 and the center of rotation of the table 3. At this time 70 the support plate is entirely within the circumference of the table and the tracks 3| are aligned with the plunger GI. As the table 3 rotates this rotation is necessarily translated to the plate I9 and die I8. However, the slide 30, swiveled on the 76 stationary pin- 29, remains stationary thus causing a relative movement between the rotating 3 table 3 and the support plate l9, that is, the

' wise the movement of the plate l9'in the guideway 2| causes the die to simultaneously recede This movement on the part of the die obviates the need for the shoe to travel from the ironer 52.

up a steep hill during this first quarter rotation. In other words, this movementof the die away from the ironer as it rotates decreases the force component acting tangentially or perpendicularly to the radius of the die at the point of contact of the ironer with the work so that this component is not large enough to destroy the ironer and the work. It may also be said that the backing away of the die from the ironer makes it easy'for the ironer to climb the hill presented by the face of the die along its long side.

As-the die travels through the second quadrant, that is, from the position shown in Fig. 18 to that shown inFig. 19, the ironer travels what may be termed down-hill. At this time the stationary slide 36 operating between tracks 3| returns the plate l9 back to its original position within the circumference of the rotating table 3. During the third quadrant of rotation of the die, that is, from the position shown in Fig. 19 to that shown in Fig. 20, the ironer is again traveling up-hill and at this time the plate I 9 is again drawn away from the ironer during the rotation as, and for the purpose, described above.

The machine is designed to operate with various dies, the working faces of which have differshape of theframe or article into which the metal The adjustability of the pin 29 and block 30 varies the length of the stroke of the plate 19 as it reciprocates across the rotating table 3. Through the adjustability of the pin 29 and slide block 30 the stroke of plate I 9 can be lengthened to accommodate those dies which have longer faces and the stroke can be shortened to accommodate those dies which have short faces. ,In some instances it will be desirable to adjust the pin'29 so that it is concentric with the post 2, that is, the center of rotation of the table,

ironer for yieldably holding the work against theworking face of the die, and means for moving the die relative to the rotating table during the bending operation so that the geometrical center of.

the 'die travels toward and away from the center of rotation of the said table.

- 2. A metal bending machine comprising a rotatable table, a diereciprocably mounted on the said table and arranged to rotate therewith, the said die having a working face about which the metal is'bent during the rotation of the die, some portions of said face being more distant from the geometrical center of the die than other portions,

an ironer exerting a thrust toward the center of rotation of the table for yieldably holding the 5 work against the working face of the die, and means for reciprocating the die relative to the rotating table during. the bending operation so that the geometrical center of the die travels away from the center of rotation of the table as 5 the ironer travels about the die from one working face portion of 'the die to another working face portion more distant from the geometrical center of the die whereby the travel of the ironer along the work and about the die is facilitated.

3. A machine for bending a single length of metal of channel or equivalent section into a frame in a single operation comprising a rotatable table, a die around which the metal is bent having portions of its working face spaced far- 15 ther from the geometrical center of the die than other portions, the said die being supported on the said rotatable table" and arranged to move relative to the table during-the rotation of the table, an ironer for yieldably engaging the work 20 and holding the same against the working face of the die during .the bending operation, and means for moving the said die relative to its supporting table during the bending operation whereby the die retreats from the ironer as the ironer travels from one portion of the working face of the die to another portion of the working face of the die more distant from the geometrical center of the die.

4. A metal bendingmachine. comprising in combination a rotatable table, a die carried by the'said table and arranged to rotate therewith, the said die having a working face against which the work is held during the bending operation, an-ironer for yieldably holding the work against the working face of the die. the working face of n the die having one portion closer tothe geo' metrical center of the die than another more distant portion thereby presenting a hill which the ironer must climb as it passes from the work.- ing face portion closer to the geometrical center of the die to the working face portionmore distaut-from the geometrical center of the die, and means for shifting the said die bodily relative to the rotating table during the uphill travel of the ironer whereby the travel of the ironer along the up hill face of the die is facilitated.

5. A metal bending machinecomprising in combination a rotatable table, a die carried by the said table and arranged to'rotate therewith, the said die having a working face against which the work isheld during the bending operation, an ironer exerting a thrust toward the center of rotation of the said table for yieldably holding the work against the working face of the die, the working face of the die having one portion closer to the geometrical .center of the die than another more distant portion thereby presenting a'hill which the ironer must climb as it passes from the working face portion closer to the geometrical center of 'the die to the working face portlon'more distant from the geometrical center of the die, and means for shifting the said die bodily relative to the rotating table and away from'the said ironer during the up hill travel of the ironer whereby the travel of the ironer along the up hill face of the die is facilitated.

6. A metal bending machine comprising in combination a base, a table rotatably mounted on the said base, a guideway extending across the table, a die supporting plate reciprocably mounted in the said guideway, a die carried by the said support plate having a working face about which the metal is bent, an ironer for holding the work against the working face of the die during the bending operation, and means for reciprocating the said support plate in the said guideway during the rotation of the table to facilitate the travel of the ironer along the wtgrking face of the die duringthe bending opera on. y

7. A metal bending machine comprising in combination a base,'a table rotatably'mounted on the said base, a guideway extending across in the said guideway to facilitate the travel of the ironer along the working face of the die.

8. A metal bending machine comprising in combination a base, a ,table rotatably mounted on the said base, a guideway extending across the tabie,,a die supporting plate reciprocably mounted in the said guideway. a die carried by the said support plate having a working face about which the metal is bent, an ironer for holding the work against the working face of the die during the bending operation, the said die support plate having a guideway extending transversely of the guideway in the said rotatable table, a fixed pin operatively engaging the said support plate in the said guideway andoffset from the center of ro- ,tation of the table whereby as the table rotates the die support plate reciprocates in the said guideway to facilitate the travel of the ironer along the working face of 'the'die.

9. A metal bending machine comprising in combination a base, a table rotatably mounted.

on the base, a guideway extending across the table, a die support plate reciprocably mounted. in the said guideway, a die having a working face about which the metal is bent carried by the support plate with its longer diameter positioned parallel to the guideway which extends across the table, an ironer for holding the work against the working face of the die during the bending operation, the said die support plate having a guideway extending transversely. of the guideway in the said table, and aflxed pin having a block swiveled thereon which slidably engages the said support plate in the said guideway, the said pin and block being offset from the center of rotation ofv the table whereby as the table rotates the die support plate reciprocates in the said guideway to facilitate travel of the ironer along the working face of the die.

10. A metal bending machine comprising in combination a base, a table rotatably mounted on the base, a guideway extending across the table having a plurality of rollers, a die supporting plate reciprocably mounted on the said rollers in the said guideways, a die having a working face about whichthe metal; is bent carried by the support pla'te'with its longer diameter positioned parallel to the guideway which extends across the table,-an ironer for holding the work against the working face of the die during the bending operation, the said die support plate having a guideway extending transversely of the guideway in the said table, and a fixed pin' having a blockswiveled thereon which slidably engages the said support plate in the said guideway, the said pin and block being offset from the center of rotation of the table whereby as the table rotates the die support plate reciprocates in the said guideway to facilitate travel of the ironer along the working face of the die. '25

11. A metal bending machine coinprising in" combination a base,.a table rotatably mounted on the base, a guideway extending across the table having a plurality of rollers rotatably mounted in the bottom of the guideway and a plurality of rollers mounted with their axes inclined along the side of the guideway, a die supporting plate with inclined side faces reciprocably carried 'upon the said rollers in'the bottomof the guideway and having the inclined side faces in rolling engagement with the rollers along the sides of the ,said guideways, a die having a working face about which the metal is bent carried'by the support plate with its longer diameter positioned parrocates in' the said guideway to facilitate thetravel of the ironer along the working face of the die. a

OTTO H. JENSEN