US2120679A

US2120679A - Gravity press

Info

Publication number: US2120679A
Application number: US138741A
Authority: US
Inventors: Pohle Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-04-24
Filing date: 1937-04-24
Publication date: 1938-06-14
Anticipated expiration: 1955-06-14

Description

A. POHLE GRAVITY PRESS June 14, 1938.

Filed April 24, 1957 4 Sheets-Sheet 1 www.

ATTORNEY June 14, 1938. A. POHLE GRAVITY PRESS Filed April 24, 1937 4 Sheets-Sheet 2 ATTORNEY `une 14, 1938. A PQHLE 2,120,679

GRAVITY PRESS Filed April 24, 1957 4 sheets-sheet 5 ATTORNEY `une 14, 1938. A POHLE 2,120,679

` GRAvTY PRESS Filed April 24, 193'? 4 Sheets-Sheet 4 274 6 25o W f i V l I r/ ,WJ/ Hg] f ""LXVW; l 246 lt i 252/2 |l i 276 /270 l w/ 273 v i l l1 1 y 1 246i I l E )IK/257 X 257 252 52 I 7 i y 5266 11 @.6 66 I 22262 lll will.

ATTORNEY maagd June 14,1938

UNITED STA-TES PATENT l oi-Fics yafecten GRAVITY PaEss Albert mme, Brooklyn, N. Y. t Applicaton'AprilM, 1937, Serial No. 138,741

6 Claims.

This invention relates to a gravity press. The object of the invention is the production of a gravity press for embossing doilies, letterheads, leather goods, and various other articles.

The organization of the invention comprises a gravity press having a male and female die for objects to be embossed. The said objects are automatically positioned between the dies by clamping devices. The lower or male die is struck by a female die which drops at predetermined intervals. Clamping devices, by means of a conveyor'locate the objects to be embossed between the -dies at the proper times. The objects embossed are transferred to a conveyor which positions them one after vthe other on a table board.

The essential object of the invention is the production of means for controlling the upper or female die of the press.

Other objects of the invention will appear from the description of the invention :as set forth.

In the accompanying drawings Fig. 1 representsfa side elevation of an exemplification of the improved gravity press; Fig. la shows an enlarged fragmentary portion of Fig. 1;l Fig. 2 shows a topv view of Fig. 1 with aportion in section; Fig. 2a indicates an enlarged partial section of Fig. 1 on the line 2a, l a; Fig. 3 indicates a partial left hand view of Fig. 1; Fig. iis a section of Fig. 3 on the

line

4, 4; Fig'. 5 indicates an enlarged section of Fig. l on the line 5,` 5;

Fig. shows a right hand view of some of the.

' elements of Fig. 5; Fig. 6a shows portions of 3 Fig. 6 on an enlarged scale; Fig. 7 represents a top view of Fig. 5; Fig.A 8 indicates an enlarged partial section of Fig.-1 on the

line

8, 8; Fig. 9 is a partial-section of Fig. 8 on the line 9, 9.and Fig. 10 shows a side view of va clutch sleeve. Referring to Figs. 1 to 4, the improved gravity press comprises a pair of

side frames

20 and 25.

vrEach of the side frames comprises the lower ,tapered portion 28, which joins with the upper rectangular upper portion 29. A central bridge i 30 is fastened to the

frames

20 and 25 at about the central portions thereof, and an upper bridge 3| is fastened to the top ends of said frames.

At the lo` er ends of said frames are shown the feetv 32, which laterare supported upon and fastened to the base plate 35. 1

'I'he main drive shaft 48 of the press has its ends journaled in the bearings 4i of the

frames

20 and 25. A one revolution trip clutch mechanism, see Figs. 1, 2, 3, 8, 9 and 10, is indicated to comprise a clutch sleeve loosely supported on (Cl. 101-3) y the shaft 48. The clutch sleeve -comprises the portion 43 which has `integral therewith the enlarged portion 44 having the heel 45. The portion v 43 has a longitudinal opening 48. The shaft 40 is 1 flattened for the wearing strip 48, which is 5' rslida-bly supported a plunger 51 having va shoe 58, at one end. A spring 59 bears against one end of the cavity 59a in the housing 5.6 and the shoe 58, to force the latter to the portion 44 of the sleeve.v A groove (i2l is indicated in the portion 15 44 of the clutch-sleeve for the shoes 58. A collar 83 is fastened to the shaft 48 and bears against the portion 44 of the clutch sleeve, to maintain the clutch mechanism laterally in position.

A bearing 10, see Figs. 1 and 3, is integral with 20 the frame 25 and supports thestud 1i having the collar 12 at one end, and is clamped in place `by the nut 13. A hub 15, is supported on the stud.1l. `between the frame 25 and the collar 12.

From the hub 15 extends a bell crank compris- ,25v

ing the clutch dog 11 and the arm 18. A spring 19 has one end fastened Yto the frame 25 and its other end is fastened to the clutch dog 11.

On a rod 281, vto be described, is supported the sleeve 80, which has integral therewith the jour- 30 nal bracket 8l, andthe latter supports a pin 82. A treadle 83 hasone end fastened to the pin 82. 'An arm 84 has one end fastened to the pin s2. A unk ss has its ends pivoted to the arms 18 and 84. 35

When the operator bears on the treadle 83, the clutch dog 11 is released from the heel 45 of the portion 44 of the clutch sleeve. vIt is to be .understood that the ygear 55 continuously turns during the operation of the press. When the 40 clutch dog 11 has been. released, the shoes 58 will cause the sleeve having the portion 44 to turn a little, and the clutch roller 50 is wedged between the'wearing strip 48 and the hub of the gear 55, and thereby the shaft 4o is turned. 5

A worm gear housing is supported on the base plate 35. An electric motor 9i is carried by the housing 90. A pinion of the worm gear housing is indicated at 93 and is in mesh with 50 the gear 55. l

With the rotations of the motor 9i the gear 55 is turned. On the main drive shaft 40 is fastened the gear 95 (see Figs. 1 and 3). A cam and 25 and has fastened thereto the gear 00 which is in mesh with the gear 03.

Referring to Figs. l and 3, a pair of cams |03 are fastened to the cam shaft 00. A pair of slide blocks |03 are loosely supported on the shaft 03. A pair 0|' cam forks |01 each have a bifurcated member |03 and each' cam fork has fastened thereto a lifting rod |00, by the screws |00a, as indicated. 'Ihe lifting rods |00 are guided in the guide ways ||0 of the

frames

20 and 25. One of the rods |00 has integral therewith the lug A cap ||2 is bolted to each of the

frames

20 and 25 over the guide ways ||0, to maintain the lifting rods |00 in operative position.

To each of the cam forks |01 is journaled a roller ||3 on the studs I |4. 'Ihe bifurcated members |00'straddle the slide-blocks |03. 0n one end of the cam shaft 00 is fastened a V groove pulley ||5. Adjacent to the gear 00 is fastened to the cam shaft 00, a cam ||0. 'I'he upper portion of each of the

frames

Inthe guide bar |53, see Figs. 1, la and 3, is indicated the longitudinal keyway |50 for the key |50. The latter is fastened in place by the screws |60.

Toapairoftheangleshapedguidesinare ,bolted the journal brackets |30, which support lindicated a pair of adjusting nuts |0|.

The operation of the die head |32 is as follows.

When the clutch mechanism for the main driv-l ing shaft 40 is engaged therewith, the said shaft turns. .Thereby the gears 05 and 00 are turned. The cam shaft 00 turns with the gear 00 and the said cam shaft 00 makes one revolution for every revolution of the clutch mechanism. The cams |05 of the shaft 00 raise the cam forks |01. The lifting rods |00 rise with the forks |01. The lifting rods |00 abutting against the screws |50, cause the die head |32A to rise. When the cams |05 raise the die head |32 to the end of its up stroke, the arm |66 of the bell crank |64 locks with the key |50. At this instant the die head |32 is held in locked position at the upper end of its stroke. The lifting rods |00 now return to their lower position. At the end of the down stroke of the rods |00 the lug will contact with the adjusting nuts 0| of the adjusting rod |00. The said rod |00 swings down the lever |13 and the arm |15 will contact with the bell crank arm |65, which disengages the bell crank arm |66 from the key |50. By this means the die head |32 with the die drops by gravity and coacting with the lower die described embosses the object operated upon.

When the female upper die Idrops to the end oi' its stroke, the tension of the spring |51 cushions the force of its descent and provides means for the' rebounding of the female or upper die.

For the operator of the press to locate the dies i in place, or make adjustments, a safety device is provided to avoid injury by the descent of the die head |32.

To the base plate 35 are fastened pairs of brackets 206. 'Ihe said brackets 203 support each one end of a rod 201. Stands 200 have extending therefrom the vertical supporting rods 2|0 and 23 aiaovo 2|`|. Each of theiatter rods supports a bracket 2|2. 'The lattereach support one end of the rods 261. On the supporting'rods 2|6 are secured the journal and supporting brackets 2li. At the upper end of eachsupDQrtlng rod 2li is fastened a journal and supporting bracket 2|3 at the rear or exit end of the apparatus. -From the bars 246 the latter being to be described extends the curved guide plate 2 |8a. With each of the brackets 2-|8 is indicated the lug 213.-: On each of the rods 2|| is supported .the triangular shaped bracket mwitn thermclined table board 223. The latter has adjustably connected thereto the stop angle plate225.

yAn adjusting screw 236. is carried by each of the brackets zie. At

23|. A- shaft 232 with the roller 233 is supported in the journal brackets 23|. At the upper ends of thebrackets`2|8 is journaled a conveyor drive chain shaft 235. To the shaft 235 are fastened the large sprocket chain wheels 236 and the small sprocket chain wheel 233. In the supporting brackets 2|5 is journaled a conveyor chain shaft 24|. The latter has fastened thereto the large sprocket chain wheels 244. Pairs of supporting bars are indicatedat 246 which are supported at their outer ends by the brackets 2|5 and 2|3, and at their inner ends bythe bridge 36, and have connected thereto the crossbars 241.

A feed table 256 is supported on the supporting bars 246.

A pair-of conveyor sprocket chains are each indicated at 252 and are supported upon the sprocket chain wheels 2381and 244. Each of the chains 252 carries a plurality of pins 253 (see Fig. and on each of said pins is journaled a guide roller 254. A pair of guide rails 256, each having the U shaped groove 251, have integral therewith the legs 258. The latter are supported upon and fastened to the cross bars 241. i

The guide rollers 254 engage the U shaped grooves 251. The rails 256 have extending therefrom the legs 256.`

The members 26| and 262 of a table are supported on the bars 246 and the lugs 253. To the connecting bars 241 are fastened a plurality of brackets 265, one of which is shown in Fig. 5. The brackets 265 support the central member 266, of said table. To each of the chains 252 are connected a plurality of clamping devices, each `designated in its entirety by the numeral 216,

with each clamping bar 213 is indicated a journal bracket 214. In each pair of the journal brackets 214 is journaled a shaft 215;I To the shaft 215 is fastened a clamping lever, comprising a pair of arms 216 with the connecting member 211. A rubber pad 21.8 is fastened to the lower face of the member 211. A tapered operating arm 286 for each clamping device 216 is integral with one of each pair of arms 216. At one end of the shaft 215 is supported the helical spring 282. One end of the spring 282 is fastened to one of the. journal brackets, 214 and its other end is fastened to a tension collar 283,

fastened to the shaft 215.

On one of the bars 246 (see Fig. 1) is fastened a journal bracket 288, and to'the fastened a journal bracket 283. yA rack shaft one end of each of the .screws 236 is supported an open journal bracket bridge 36 is 236 has its ends journaled in the

brackets

283 and 283." A lever 233 having the forked end 234 has its hub end fastened to the shaft 236. A connectingV rod 235 connects the forked end 234 of the lever 233 and the treadle 83. A controlling arm 236 is vfastened to oneend of the shaft'236 and coacts with the operating Varm 286.' A bell crank, (see Fig. `1) 231 having the arms,238 and 233, is pivcted to the frame zo, by means of the pivot zoo. To the arm 233 is journalel a roller362 which coacts with the cam I |8 Illhe arm 238 has a forked end 363, which carries a pin 364. The pin 364v supports the rod 366,`having a thread at one end for the clamping nuts 361 and 368, which bear against the pin 364.

The other end o i the rod 366 has an eye end 363. A journal bracket 3|6 and a journal bracket 3|| are fastened to the bridge 36. The bracket 3|6 has integrall therewith the 'journal bearing 3|6a and has extending therefrom the pin 3|2.

guide 3|3, and journal bearing 3|5. A vertically sliding rack bar 3| 6 is guided in the rack guide -3|3 and is shown with the forked member 3|1 at its lower end. The latter is pivoted to the connecting rod 366, by means of the pin- 319. Inthe journal brackets 3|6 and 3|| is journaled. a cross shaft 32|.v A gear 322 is'loosely supported on the shaft 32| and is in mesh with the teeth of the sliding rack bar 3|6.A

To the gear 322 is fastened the ratchet wheel 323 having a pair of teeth.A On the shaft 32| is. fastened a disc 321 which carries alpawl 323- 'Ihe latter coacts with the teeth of the ratchet wheel 323. To the central portion of shaft 32| is fastened' a sprocket chain wheel 336. A sprocket chain 332 engages the

sprocket chain wheels

336 and 233.

In' the journal-bearings 3|6a and 3| 5`` is 'supported a shaft 335. A belt pulley 336 is fastened to the central portion of the shaft 335. To one end of the shaft 335 is fastened a pulley 338 having the V groove v333. nects the pulley 338 and the pulley ||5. A belt 342 connects the pulley 336 and the pulley 233.

0n the table 256 are placed a plurality of doilies 345 or other objects to be embossed.

When the press stops the operating arm 286' contacts with the lever 236, and thereby the arm y 211, which is normally inthe closed position, is swung operi.'l The operator now places` one or more doilies between the clamping bar 21'3 the rubber pad 218 (see Figs. 6 and '1). The operator now bears on the treadle 83, and the connecting rod 235 pulls down the lever 233 and thereby the shaft 236 is slightly turned. At the same time the arm 236 moves to permit4 movement of the member 211 of the clamping device.

The clamping device 216 gripsv one or morepf `the doilies 345 and moves them in position beand the conveyor chain shaft 235 is turned by chain wheels 233. The rotations the sprocket of the sprocket chain Wheels 233 turn the shaft 235. The wheels 238 turn with the shaft 235 to drive the chains 252. '4

A V shaped belt 346 conand Each time the operator trips the foot treadle 83, the chains 252 move in the direction of the arrow A, Fig. 1, and the doilies 345 are carried around the sprocket wheels 220, within 'the guide plate 2I8a and move with the chains 252 untilA the operating arm 2 strikes the pin SI2 and the members of the clamping device 210 are opened.

t, The doilies now drop to the beit 342 and are vconveyed in the direction of the arrow B, Fig. 1 to the table board 222, on which they are deposited for removal. The stop angle plate 225, can be adjusted in various positions for doilies of different sizes. A

Attention is called to the fact that the members of the clamping device having the arms 216 can be moved forward or to the rear by locating the` sprocket chain wheels 232 in different angular -positions on the shaft 235, to cause the chains 252 Fto locate the clamping device having the arms-216 with the doilies in proper position.

The operating arm 296 is alsoadjustable to open the members of the clamping device 210, when the chain 252 is stopped between the dies |36 and |31.

Various modifications might be made in the invention and the present exempliiication -is to be taken as illustrative and not limitative thereof.

Having described my invention I claim:

1. In an apparatus of the character described the combination of a pair of frames, gibs supported on the frames, each of said gibs having a V shaped groove, a slide in the apparatus, said slide being V shaped grooves positioned oppo site the V shaped grooves in the gibs, a plurality of balls in the V shaped grooves of the slide and its coacting V shaped groove in its adjacent gib and plates at the top and bottom ends of the slide for each plurality of balls.

2. In an apparatus of the character described the combination of a pair of fra'mes, an upper bridge connecting the upper ends of the frames, a reciprocating slide supported in the frames, a die hea'd carried by the slide, a female die carried by the die head, a guide bar extending from the slide and actuated thereby, said guide bar extending through said bridge, a shock absorbing spring encircling the guide bar and bearing on said bridge, a pair of adjusting nuts on the guide contacting with said spring upon the descent of the die head, a central bridge connecting y said frames, a die holder supported on the central bridge, a male die carried by said die holder, said adjusting nuts with the descent of the die head contacting with said spring and cushioning the blow of the female die and rebounding the same.

3. Ina press of the character described thel combination of a pair of frames, a cam shaft journaled in the frames, means to rotate the cam shaft, cams supported on the cam shaft, a pair of cam forks in the press, a roller journaled to each cam fork coacting with said cams to move the cam forks, a lifting rod connected to the upper end of each camfork, a slide guided in the press, a dier at the lower end of the andavo slide, brackets extending from the slide, and an adjusting screw supported in each bracket coacting with said lifting' rods to raise the slide with the rotation of the cam shaft.

4. Inv a press of the character described the combinationof a pair of frames, a lifting rod adjacent to each frame, a slide guided in the frames, a die head carried by the slide, a guide bar extending from the die head, means to lift the lifting rods', a lug integral with one of the lifting rods, an adjusting rod guided in said lug, a pair of adjusting nuts at the lower end of the adjusting rod, a shaft journaled at the upper -portions of said frames, an arm and a lever extending from said shaft, the swinging end of the lever pivoted to the adjusting rod, a second shaft journaled at the upper portions of the frames, a bell crank fastened to the latter shaft, and means on the guide bar adapted to be locked with an arm of said bell crank, the lifting rod having the lug when descending engaging the sad'adjusting nuts and thereby causing the lever extending' from said rst shaft to swing down and thereby forcing the arm of the latter shaft against one of the arms of the bell crank an'd thereby disenV gaging the other arm of the bell crank from the guide rod.

5. In a press of the character described the combination of a pair of frames, a lifting rod adjacent to each frame, a slide guided in the frames, a die head carried by the'slide, a. guide bar extending from the die head, means to raise the lifting rods, means between the lifting rods and slide to raise the latter with the up stroke of the lifting rods, a lug integral with one of the lifting rods, an adjusting'rod guided in said lug, a pair of adjusting nuts at the lower end of the adjusting rod, ashaft journaled at the upper por? the lifting rod having the lug, when descending engaging the adjusting nuts of its adjusting rod, pulling down the lever extending from the first of 'said shafts and thereby forcing the arm of said latter shaft against one of the arms of the bell to dsengage the other arm of the bell from the key of the guide rod and thereby releasing the slide of the press with its die head.

6. In an apparatus of the character described