US2220721A

US2220721A - Leather wringing machine

Info

Publication number: US2220721A
Application number: US189788A
Authority: US
Inventors: William C Johnson
Original assignee: Machinery Development Co
Current assignee: Machinery Development Co
Priority date: 1938-02-10
Filing date: 1938-02-10
Publication date: 1940-11-05
Anticipated expiration: 1957-11-05

Description

Nov. 5, 1940. w. c. JOHNSON LEATHER WRINGING MACHINE Filed Feb. 10, 1938 s Sheets-Sheet 1 l1. v 1: MINI/as. Nv

[0 CINVEN Mi ATTORNEYS Nov. 5, 1940.

w. c. JOHNSON LEATHER WRINGING MACHINE Filed Feb. 10, 1938 3 Sheets-Sheet 2 I INVENTOR.

A TTORNEYS Nov. 5, 1940. w. c. JOHNSON LEATHER WRINGING MACHINE 3 Sheets-Sheet 5 NTOR.

Filed Feb. 10, 1938 n-I &N

NVMRN INVE C.

QLQMQ4 9 7 M ATTORNEYS Patented Nov. 5, 1940 I UNITED STATES PAT E-NT' oFF- cs LEATHER WRINGING MACHINE William C. Johnson; Milwaukee,.Wis., assignor to Machinery Development Company, Milwaukee; Wis.-, a corporation of Wisconsin Application February 10, 1938, Serial No. '189,'V788.-

5 Claims. (Cl.149 -23) The invention relates to leather wringing. ma-

chines. v In the operation of wringing leather, plates or creases are formed at the shanks and neck porw tions of the hide. The higher the wringing pressure the greater is the pressure to whichithe creasable portions of the hide are subjected. The wringing machines have heavy and expensive woolen coverings for the wringing rolls.

in When the pleated portions of the hide are sub- 15 smooth portions of the hide.

rolls on the hide-may be varied during the wringing of the hide, so that the pressure on the hide may be decreased as the neck and shank 'por tions of the hide, which naturally, tend to pleat or crease, are fed through said rolls. Thus by 25 decreasing the pressure when the pleatable portions of the hide are being wrung, the life of the woolen coverings for the rolls is conserved, there is less spoilage of the hide through cracks developed at the pleated portions, and' these pleated portions are a little more moist than other portions of the hide which aids in theperforming of subsequent operations, such. as splitting..

A further object of the invention is to provide a leather wringing machine in which one of the 35 squeeze rolls is operated by a single hydraulic cylinder operatively connected to the roll through equalizer mechanism.

In the drawings: Fig. 1 is a vertical'sectional view through a machine embodying the invention, parts being, broken away;

Fig. 2 is a sectional view similar to Fig. l

showing the rolls in squeezing position, parts being broken away; v

E Fig. 3 is a sectional view taken generally along thebroken line 3-3 of Fig. 1, parts being broken away;

Fig. 4 is a detailed sectional viewtaken on the line 44 of Fig. 3; 5

0* Fig. 5 is a detailed sectional view taken on the line 5-5 of Fig. 3;

Fig. 6 is a detailed sectional view taken on the line 6-6 of Fig. 5;

Fig. 7 is a diagrammatic view ofthe hydraulic power supply.

Referringrto the drawings,.the leather wringe ingmachine includes a frame having side frame members 8 and cross-frame members 8.

A pair of rolls 9 and Ill are suitably journalled in the frame and driven through gears II and 5.

l2 meshing with a gear l3 on a shaft |4 carrying a worm wheel |5 meshing with a worm It on a shaft ll driven byan electric motor l8.

Therolls 9 and III are provided with a woolen covering I9 in the form of a band passing over 10 said rolls and a small roll 29 which is journalled at its ends in' individually adjustable bearing blocks 2|. Each block 2| is mounted in a guide member 22 on a screw shaft 23 carried in bearings in said guide member and provided with a hand wheel 24. Moving these bearing blocks 2| through the turning of the shafts 23 moves the roll and tensions the band or covering |9 and allows some independent adjustment of the sides of theband. The two rolls 9 and I0 and the roll 20 20 together with the covering or band |9 which moves over said .rolls are sometimes referred to as the upper squeeze roll unit.

The lower squeeze roll unit includes the

rolls

25 and 26 and the woolen covering or band 21 25 running over said rolls, these rolls being suitably journalled in bearings 28 on a beam 29 which is slidably mounted in. guides 39 on the side frame members 8. The movements of the ends of the beam 29 are equalized by equalizerarms 30 3| mounted on a common pivot shaft 32 and engaging in slots 33 at the ends of the beam.

* The rolls v9, I0, 20, 25, and 26 are each provided with a series of longitudinally extending grooves 9' which act to keep the coverings associated with said rolls, from slipping relativethereto.

A spreading or setting out roll 34 of the helic'ally grooved face type is journalled in the frame constant speed by belts adapted to operatively connect a multiple belt pulley 35with a suitable source of power. A rubber faced presser roll 36 is mounted in bearings 31 slidably mounted in guides 38 on the beam 29 and yieldingly moved '5 outwardly by springs 39 interposed between said bearings 31 and adjustable stops 4|], each of said bearings 31 having a rod 4| adjustably secured thereto and slidably mounted in a guide 42111 the beam and provided with adjustable stop nuts 43 limiting the outward movement of said bearing. With this construction when the beam 29 is raised to bring the'lower squeeze roll into operative association with the upper squeeze roll; the presser-roll 36 is brought intoioperative of tl'ie'machine and is independently driven at 40 association with the spreading r011 34 and is adapted as shown in Fig. 2 to yieldingly press the hide 44 against said spreading roll.

The beam 29 with the lower squeeze roll is adapted to be raised and lowered by hydraulic means comprising a piston 45' operating in a cylinder 45 and having its rod 46 secured to said beam by .a swivel connection including the curved bearing surfaces 41 on the beam engaged by the curved nut 48 and curved washer 49, the rod extending through a slot 50 in said beam. This swivel connection permits some tilting of the ends of the beam relative to each other. The piston is moved up and down in the cylinder by hydraulic fluid introduced by piping 5| to the space in front of said piston and by piping 52 to the space in back of the piston.

For supplying the cylinder with hydraulic fluid, I show in Fig. 7 an hydraulic pump 53 driven by an electric motor 54 and provided with the suction line 55 and a discharge line 56, these lines connecting through suitable valve mechanism 57 with the piping 5| and 52. The valve mechanism has not been shown in detail but is of any suitable construction to control the passage of pressure fluid to either of the pipes 5| and 52 and the release of fluid from the other pipe.

The actuator for the control valve includes a link or rod 58 which is normally moved to an open position by a spring 59 and is adapted to be moved to a closed position by a lever 60 pivoted intermediate its ends at 6| on the frame of the machine and having an arm 62 forming a treadle at one end thereof. Return movement of the actuator by the spring 59 is checked or retarded on the release of the treadle by the operator through a dashpot device such as a cylinder 63-having the relief opening 64 and having a piston 65 working in said cylinder and having its rod 66 operatively connected to the arm 62 of the lever 60 by a link 61. With this arrangement the restricted escape of the air from the cylinder through the opening 64 checks the upward movement of the piston 65 and hence the lever 60 and the hydraulic control valve mechanism associated therewith, so that after the operator takes his foot from the treadle, the valve mechanism, providing a relief of the pressure fluid, will be checked in its opening movement, so the pressure will be gradually reduced on the piston which through the connection of its rod 46 with the beam 29 will reduce the pressure applied by said beam to the lower press roll before the pressure is finally relieved. Thus with the present arrangement the maximum total pressure between the rolls may be thirty thousand pounds acting on the greater surface of the hide, and the'release of the foot treadle and the action ofthe dashpot device permits the pressure to drop to. twenty thousand pounds while acting on the shank or neck portions of the hide before the final release.

With the present arrangement the upper press roll unit and the spreading roll 34 are constantly driven, and with the squeeze roll units separated as shown in Fig. 1 the hide 44 is placed over the lower squeeze roll unit and over the presser roll 36. Thereafter, the operator depresses the treadle lever 60 and operates the valve mechanism 51 to admit pressure fluid to the lower end of the cylinder 45 so as to move the piston and the beam 29'connected therewith upwardly until the squeeze roll units engage the'hide' as shown in Fig. 2, and the presser roll 36' acts to yieldingly press'the hideagainst the spreading roll 34. The

squeeze rolls then act to draw the half section of the hide between them and past the setting out roll 34, thus spreading out and wringing onehalf of the hide. The squeeze rolls are then separated, and thereafter the other half section of the hide is positioned between the squeeze rolls and the rolls 34 and 36 and operated thereon as in the first instance. In wringing out the hide the shanks and neck portions being thicker have pleats or creases formed therein, and the higher the wringing pressure the greater will be the pressure to which these thicker creasable portions are subjected. These thicker portions as they pass between the woolen coverings or belts l9 and 2'! tend to embed themselves therein and thus break down the woolen coverings; yet it is desirable to use a high wringing pressure on the smooth portions of the hide. Also when heavy pressures are used, the pleated portions of the hide itself sometimes crack which, of course, reducesthe value of the finished stock. With the present invention when the shanks and neck portions of the hide are passing between the squeeze rolls, the operator releases the foot treadle lever 60 which due to the dash-pot mechanism is not instantly released with the result that the relief valve mechanism 5'! for the hydraulic pressure fluid is not fully opened until after the pleatable portions of the hide have passed between the squeeze rolls with the result that the shank and neck portions areno-t subjected to the full pressure, but the pressure on these portions is some twothirds of the total pressure, so that the life of the roll coverings is conserved, the hides themselves are prevented from being cracked at the shanks, and the pleatable portions are a little more moist than the other portions of the hide which helps in the performing of subsequent operations, such as splitting. The pressure of the rolls acting on the hide is visible to the operator through the gauge 68 at all times, and he may readily release the pressure on either end of the skin, that is, on either the head or the shank portion of the hide. So far as I am aware, I am the first to vary the pressure on the hide during the wringing operation thereof, so that the pressure on the pleatable portions of the' hide is reduced from that of the other portions, and I, therefore, desire it to be understood that this invention is not to be limited to the details of construction hereinbefore set forth except in so far as limitations. are included in the claims.

What I claim as my invention is:

1'. In a leather wringing machine, the combination with the wringing rolls, of means for moving one of said wringing rolls into cooperative pressing association with the hide disposed between said rolls comprising a beam in which said wringing-roll is carried, an hydraulic. cylinder, a piston working in said cylinder anddirectly connected to the central part of said beam, and means for supplying. said cylinder with operating fluid. Q.

2. In a leather wringing machine, the combination with the wringing rolls, of means for moving one of said wringing rolls into cooperative pressing association with-the hide disposed between said rolls comprising "a beam on which said wringing roll is carried, an hydraulic cylinder, a piston working in said cylinder and having a swivelled connection with the' central part of said beam, means for guiding said beam, an

equalizer for the ends of said beam, and means for supplying said cylinder with operating fluid.

3. In a leather wringing machine, the combination with cooperative sets of wringing rolls and a covering for each set of rolls, of hydraulically operated mechanism for moving one set of wringing rolls and its covering into pressing engagement with the other set of wringing rolls and its covering and for putting pressure on the hide between said coverings, means for supplying said mechanism with pressure fluid, a control valve for said last named means, means under the control of the operator for operating said control valve, and means for checking the release action of said valve operating means.

4. In a leather wringing machine, the combination of a frame, an upper wringing roll unit, a

lower wringing roll unit including a beam slidably guided on said frame, said beam having slots adjacent its ends, equalizer arms Working in said slots, a shaft connecting said arms, an hydraulic cylinder, a piston working in said cylinder and having a swivelled connection with the central part of said beam, and means for supplying said cylinder with operating fluid.

5. In a leather wringing machine, the combination of a wringing roll unit comprising three rolls in spaced relation including a pair of driven rolls and a guide roll, an endless covering running over said rolls, means for individually adjusting the ends of said guide ro-ll while said driven rolls are operating to tension the covering about said driven rolls, a bodily movable wringing roll unit including a roll and a covering for said roll, and means for bodily moving said last named r011 unit into wringing association with said first named unit.

WILLIAM C. JOHNSON.