US2923263A - Reciprocating bed metal drawing press - Google Patents

Description

Feb. 2, 1960 DANLY ETAL RECIPROCATING BED METAL DRAWING PRESS Filed June 21, 1955 5 Sheets-Sheet l 22 i {20 I15 I02 /0 w m m w.

3,3 ILO /SD WLY VHS/L Geo/e FF ATTORNEY Feb. 2, 19.60 P. H. DANLY ETAL 2,923,263

RECIPROCATING BED METAL DRAWING PRESS Filed June 21, 1955 5 Sheets-Sheet 2 so 66 w i 9 a a4 3 /79 I 4 INVENTORS 8O {77 76 82 PH/Lo 1 DFM/L Vns/L GEO/26E F 0 BY LSILJM Feb. 2, 1960 P. H. DANLY ErAL RECIPROCATING BED METAL DRAWING PRESS 5 Sheets-Sheet 3 Filed June 21, 1955 ex 00w w wo\ mi N NHG M omx H6 M 4, m 5 H Pi H. DANLY EI'AL RECIPROCATING BED METAL DRAWING PRESS Feb. 2, 1960 Filed June 21,' 1955 5' Sheets-Sheet 4 I I I r I 7 HTTOENEY Feb. 2, 1960 P. H. DANLY ETAL 2,923,263

RECIPROCATING BED METAL DRAWING PRESS Filed June 21, 1955 5 Sheets-Sheet 5 IN VEN TORS PH/LO H. DHNLY BY VHS/L 650250-7 RECIPROCATING BED METAL DRAWING PRESS Philo H. Danly, Hinsdale, and Vasil Georgetr, La Grange Park, Ill., assignors to Danly Machine Specialties, Inc., Chicago, 111., a corporation of Illinois Application June 21, 1955, Serial No. 516,934

3 Claims. (Cl. 113-38) Our invention relates to a power press and more particularly to a reciprocating bed metal drawing press which operates at a high speed.

In integrated production lines in which operations are generally performed in correlated phases, high speed power presses are necessary if full advantage is to be taken of the potential production capacity of the line. High speed operation of a power press must be-achieved without exceeding the permissible draw speed for the material being worked on. In other words, the slide .must not be driven at a speed which would result in tearing of the metal being worked. Further, it is desirable in power press operation that the draw stroke start at a relatively slow speed to reduce the tendency of the metal to tear. Once the drawing operation has .begun, the draw speedmay be increased without deleterious effects. v In presses of the prior art in which the press blank holder and draw slide are independently carried on the frame, the length of stroke required for the draw slide .together with the restriction on permissible draw speed limit the number of strokes per minute at which the press operates. Then too, in this type press the speed at which the draw slide operates must be regulated to a low value at the point at which the drawing operation ycommences.

One suggested solution to the problem of providing a high speed press without exceeding the limiting draw speed is to mount the inner slide and one or two drives on a reciprocating crown which carries the blank holder. This construction permits higher speed operation than the construction in which the blank holder, separate from the crown, and slide are independently carried on the frame. is, however, limited by the weight of the crown and structure supported on it. It has also been proposed to use an inverted draw in which the draw slide is mounted for reciprocation .within the press bed below the reciprocating blank holder. In operation of this type press the blank holder moves down to clamp the work against the bed and the draw slide moves up to draw the work. This construction has .two major disadvantages. Foreign matter such as dirt, shavings, fins and metal scraps fall by gravity into the .die carried by the draw slide. It will be appreciated ;that this foreign matter prevents formation of a satisfactory piece of work. A sheet of metal upon which a drawing operation is to be performed bows owing to its inherent flexibility. In a press employing an inverted draw, the work presents its convex side to the draw slide die. Drawing in this manner may produce an unsatisfactory result, sincethe' convexity must be worked out of the sheet before the desired draw is commenced. It will be appreciated that a more efiicient operation results when the draw slide engages the concave side of the work when the bow of the work is in the direction of the draw.

We have now invented a reciprocating bed power press The speed at which this type press may be driven "stem iwltich operates athigh speed. v The speed at which our press operates permits full advantage to be taken of the potential productive capacity of an integrated production line. The draw slide die of our press faces downwardly so that foreign matter cannot fall by gravity into the die carried by the slide. The arrangement of our press is such that the draw slide engages the concave side of a sheet of metal being worked on after the sheet has been clamped between the press bed and the blank holder. The blank holder of our press is stationary so that no reciprocation of a heavy crown including the blank holder, slide and drive means is necessary. Our reciprocating bed press operates at high speed to increase production while decreasing the labor cost of the articles produced thereby.

One object of our invention is to provide a reciprocating bed power press which operates at high speed.

Another object of our invention is to provide a reciprocating bed power press which may be used in an integrated production line to permit full advantage to be. taken of the productive capacity of the line.

A further object of our invention is to provide a re ciprocating bed power press which operates at high speed! without the necessity of reciprocating a heavy crown.

Other and further objects of our invention will appear from the following description.

In general our invention contemplates the provision of a power press including a stationary blank holder carried by the press frame and a bed mounted for reciprocation with respect to the frame for cooperation with the blank holder. Drive means moves the bed to clamp work fed to the press between the bed and the blank holder. We slidably mount a draw slide for reciprocating movement within the blank holder. Slide drive means synchronized with the bed drive moves the slide to perform a drawing operation on the work clamped between the bed and the blank holder. We provide means for adjusting the position of the blank holder on the frame and means for adjusting the position of the draw slide on the frame.

In the accompanying drawings which form part of the instant specification and which are to be read in conjunc-- tion therewith and in which like reference numerals are. used to indicate like parts in the various views:

Figure 1 is a sectional front elevation, with some parts: removed and other parts broken away, of one form of; our reciprocating bed press showing the general arrangement of parts.

Figure 2 is a sectional side elevation, taken along the line 22 of Figure 1, of our reciprocating bed press.

Figure 3 is a sectional view, drawn on an enlarged scale, taken along the line 3-3 of Figure 1, of our reciprocating bed press.

Figure 4 is a fragmentary sectional view, drawn on an enlarged scale, taken along the line 44 of Figure l, of our reciprocating bed press, showing the stroke adjusting means.

Figure 5 is a schematic view showing the relative positions of the press parts at various points during a cycle .of operation of our reciprocating bed press.

.the frame 10 provide a two-point suspension for the blank holder 12 within the press frame. We fix one end of each of the rods 14 within one of a pair of cylindrical mounting supports -16. each carried by a pair 'ofbrackets just described for codriving the bed 48.

18 and 20 fixed to the press frame by any convenient means such as welding or the like. Nuts 22 and 24 retain rods 14 in their respective supports 16. The end of each of the rods 14 remote from a support 16 is threaded and passes into a worm housing 26 supported on the blank holder 12 'by a cylindrical support 28. A drive motor 39 carried by the blank holder drives shafts 32 through a gear box 34. Shafts 32 drive the worms (not shown) within the respective housings 26 associated with the rods 14. From the structure thus far described it will be appreciated that the position of blank holder 12 on the press frame may readily be adjusted .by energizing motor 36 to move the blank holder 12 up or down along rods 14. In the course of operation of our press after adjustment, blank holder 12 is stationary.

We mount an inner or draw slide 38 within blank holder 12 for reciprocation with respect to the blank holder and frame on suitable bearing surfaces such as gibs or the like. A pair of counterbalance cylinders 40 .and 42 carried by frame 11) support the weight of inner slide 38 from the frame. Each of the cylinders 40 and 42 includes a respective piston rod 44 secured to a bracket 46 on the inner slide.

We mount the bed 48 of our press for reciprocation with respect to the press frame. A pair of counterbalance cylinders 58 and 52 carried by respective brackets 54 and 56 secured to the press frame support the weight of bed 48. Respective arms 58 and 60 secure the rods associated with cylinders 51 and 52 to the bed 48. I

A common prime mover for driving both the draw slide 38 and the press bed 48 includes a motor 62 carried by a bracket 64 pivotally secured by a pin 66 to the press frame. Motor 62 drives V-belts 68 to drive the flywheel 70' of the press. As can be seen in Figure 2, a clutch carried in a housing 72 is adapted to engage flywheel 70 with a drive shaft 74 when the press operates. We rotatably mount shaft 74 in respective bearings 76 and 78 carried by the press frame. A brake carried in a housing 80 restrains shaft 74 from rotation when flywheel 70 is disengaged from the shaft. Shaft 74 carries for rotation therewith a pinion 82 which engages and drives a gear 84 fixed for rotation with a shaft 86 rotatably mounted on the press frame. Shaft 86 carries for rotation with it a pinion 88 which drives an eccentric gear 98 formed with a hub 92 mounted on a shaft 94 for rotation therewith. Shaft 94 mounts for rotation with it the eccentric member 96 of an eccentric strap 98. Member 96 may conveniently be formed as an integral portion of hub 92, as shown in Figure 2. A pin 101) pivotally connects one arm of a lever 182 with eccentric strap 98. 'Wepivotally mount ofiset lever 162 at its center on a shaft 104 fixed on the machine frame.

A pin 186 pivotally connects the end of lever 182 remote from pin 1% to a link 108. A pin 110 connects link 168 to a rocker arm 112 carried by a bushing 114 in its lowermost position in the drawings.

We provide a second linkage identical with the linkage This linkage includes an arm 124 carried by a bushing 126 on a fixed "Referring again to'Figure 1, eccentric gear '90 also provides the drive for reciprocating the inner-slide of the press. Shaft 94 carries for rotation therewith the eccentric 136 of an eccentric strap or pitman 138. Becentric 136 may conveniently be formed integrally with hub 92, as shown in Figure 2. A pin 140 pivotally connects eccentric strap 138 with a rocker arm 142 carried by a rocker shaft 144 rotatably supported on the press frame. As can best be seen by reference to Figure 4, we form arm 142 with a hub 146 rotatably mounted by a bushing 148 on shaft 144. A recess 150 in hub 146 slidably mounts a clutch member 152. bearing between the member 152 and the bottom of a bore 156 in an arm, to be described hereinafter, normally urges clutch member 152 into engagement with arm 142. A spline or the like 158 on shaft 144 slidably mounts member 152 on shaft 144 for rotation therewith. It will be seen that when member 152 engages arm 142 under the influence of spring 154, arm 142is clutched to shaft 144. A key 162 mounts a crank on shaft 144 for rotation therewith. When arm 142 is clutched to shaft 144 it drives crank 160. Clutch member 152 provides a means for disengaging arm 142 from shaft 144 so that the radial angle between crank 142 and the crank 160 may be adjusted. This adjustment varies the stroke of slide 3 8. A pin 166 pivotally connects crank 160 with a draw slide operating link 164. We provide the hub 146 of arm 142 with a bore 168 to admit fluid under pressure to the interior of hub 146 to move clutch memher 152 to the right as viewed in Figure 4 against the action of spring 154 to disengage crank arm 142 from shaft 144. it will-be appreciated from the structure just described that pitman 138 drives crank 142 to drive shaft 144 and crank arm 160 to drive link 164 and thus reciprocate slide 38.

As can be seen by reference to Figures 1 and 3, link 164 is associated with the left hand side of the press. We provide a drive means similar to the drive for link 164 for draw slide link 170 associated with the righthand side of the machine as viewed in Figure 1. This drive means includes an eccentric actuated pitman 172 pivotally connected by a pin 174 to a crank arm 176 arranged to be clutched to a shaft 178, rotatably mounted on the machine frame, in the same manner as crank arm 142 is arranged to be clutched to shaft 144. A crank arm mounted on shaft 178 for rotation therewith connects shaft 178 with link 170 by a pin 182-. We provide an eccentric gear 181' similar to the gear 90 for driving pitman 172. The eccentric gear 181 is driven in a direction opposite to the direction in which eccentric gear 90 is driven. To accomplish this we mount a gear 175 on a shaft 177 for rotation therewith. Gear 84, which is driven by pinion 82, drives gear 175. Shaft 177 carries for rotation with it a pinion 179 for driving the eccentric gear 181 associated with pitman 172. It will be appreciated that gears 84 and 175 rotate oppositely with the result that links 164 and 170 have a similar movement to reciprocate inner slide 38.

Each of the links 164 and 170 is connected by a pivot pin 184 to a block 186 carried by one end of a threaded rod 188. The end of each of the rods 188 remote from a block 186 threadably engages an adjusting nut 190 disposed in a housing 192 fixed to the inner slide 38. We provide each of the housings 192 with a worm (not shown) for driving the associated nut 19!) to move the inner slide up or down with respect to the press frame. We provide a drive motor 194 for driving shafts 196 to drive the adjusting nut worms associated with nuts 190.

In operation of our reciprocating bed press, bed 48 first moves upwardly and clamps a piece of work fed to the press between itself and blank holder 12. When this has been accomplished, the bed drive linkage permits the bed to dwell while inner slide '38 makes its working stroke. After an operation has been performed, slideSS is withdrawn and the bed returns to its initial position.

Suitable means known to the art (not shown) moves rtho A spring 154 E U finished piece of work away from the press. These operations willreadily be seen from an examination of Figure 5. In Figure 7 we have shown the operation of our inner slide drive and bed drive linkages for the left side of our press, as viewed in Figure 1. We have indicated the axes of the various shafts and pivots in first corresponding limit positions by the same reference numerals as are employed in Figures 1 to 4. The positions of the axes at the other respective limit positions have been indicated by primed reference characters. We have indicated the connecting links and levers by solid lines in the first corresponding limit positions and by broken lines in the second corresponding limit positions. The paths of movement of various pivots are shown in dot-dash lines.

The solid line in Figure 6 indicates the path of movemnet of the press bed, while the broken line indicates the path of movement of the press draw slide. As can be seen by reference to Figures to 7, from an initial position in which the bed occupies its lowermost position and the draw slide occupies its uppermost position, the bed first moves up to clamp a work sheet to the press blank holder. This action occurs in approximately the first 90 of a work cycle during which time the draw slide dwells. After the bed arrives at its uppermost or clamping position, it dwells for a period of time necessary to accomplish a drawing operation. In one embodiment of our invention this dwell period occupies approximately 135 of the work cycle. The drive linkages are arranged to give the required draw slide and bed strokes. As shown in Figure 7, we may, for example, provide a twenty-one inch bed stroke and an eight and one-half inch Cll'SlW slide stroke. During the period of time when the bed dwells, the draw slide linkage operates the draw slide to perform a drawing operation on the work. When the drawing operation is complete, the draw slide moves away from the work while the bed returns to its initial or lowermost position on the press frame. When both the bed and the draw slide have returned to their initial positions, the completed work is removed from the press by conventional means known to the art and a new work sheet is fed to the press. This is the last operation indicated in Figure 5. While we have shown one path of motion for the press draw slide in Figure 6, it will readily be appreciated that we may adjust the length of the draw with convenient limits.

It will be seen that we have accomplished the objects of our invention. We have provided a high speed reciprocating bed press which may be used in an integrated production line wherein operations are performed in phase. Cur press permits full advantage to be taken of the production line capacity with a resulting increase in production and decrease in labor costs. The high speed drawing operation in our press starts at a comparatively -low speed. We achieve high speed operation in our press without the necessity of reciprocating a heavy crown. Our press operates at high speed without employing the inefficient inverted draw used in some presses of the prior art. In our press foreign matter will not fall by gravity into the die carried by the press draw slide. The draw slide of our press engages the concave side of a piece of work to perform the drawing operation efliciently.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of our claims. It is further obvious that various changes may be made in 6 details within the scope of our claims without departing from the spirit of our invention. It is, therefore, to be understood that our invention is not to be limited to the specific details shown and described. Having thus described our invention, what we claim is:

l. A power press including in combination a frame, a blank holder, means mounting said blank holder on said frame, a draw slide, means mounting said draw slide on said frame for reciprocation with respect thereto, a bed, means mounting said bed on said frame for reciprocation with respect thereto, a rocker shaft carried by the frame, a first crank, a drive link connecting said first crank to said draw slide, a second crank, means mounting said first and second cranks on said rocker shaft for rotation therewith, said mounting means including means for adjusting the relative radial positions of said first and second cranks on said rocker shaft, means for actuating said second crank to reciprocate said draw slide, drive means for reciprocating said bed, a common prime mover including a motor for said crank actuating means and for said drive means and means for mounting said motor below said bed.

2. A power press including in combination a frame, a blank holder, means mounting said blank holder on said frame, a draw slide, means mounting said draw slide on said frame for reciprocation with respect thereto, a bed, means mounting said bed on said frame for reciprocation with respect thereto, 'a rocker shaft carried by the frame, a first crank, means mounting said firstcrank on said rocker shaft for rotation therewith, a drive link connecting said first crank to said draw slide, a second crank, means rotatably mounting said second crank on said rocker shaft, a releasable clutch normally connecting said second crank to said rocker shaft for rotation therewith, said clutch being adapted to be actuated to permit adjustment of the relative radial positions of said cranks on said rocker shaft, means for actuating said second crank to reciprocate said draw slide, drive means for reciprocating said bed, a common prime mover including a motor for said second crank actuating means and for said drive means and means for mounting said motor below said bed.

3. A power press as in claim 2 in which said means mounting said second crank on said rocker shaft includes a bushing and in which said clutch includes a plate, means mounting said plate on said shaft for rotation therewith and for movement along the shaft and means for urging said plate into engagement with said crank.

References Cited in the file of this patent UNITED STATES PATENTS 848,380 Lake Mar. 26, 1907 883,813 Lange Apr. 7, 1908 1,749,545 Pierce Mar. 4, 1930 2,085,799 Glasner July 6, 1937 2,120,356 Glasner June 14, 1938 2,257,383 Johansen Sept. 30, 1941 2,338,352 Paque Jan. 4, 1944 2,522,746 Byerlein Sept. 19, 1950 2,550,062 Glasner Apr. 24, 1951 2,550,063 Johansen Apr. 24, 1951 2,550,064 Ward Apr. 24, 1951 2,627,758 Wales Feb. 10, 1953 2,643,625 Reimer June 30, 1953 2,684,742 Eason July 27, 1954 2,688,296 Danly et al Sept. 7, 1954

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