US3851423A - Skin dressing machine - Google Patents

Skin dressing machine Download PDF

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Publication number
US3851423A
US3851423A US00359276A US35927673A US3851423A US 3851423 A US3851423 A US 3851423A US 00359276 A US00359276 A US 00359276A US 35927673 A US35927673 A US 35927673A US 3851423 A US3851423 A US 3851423A
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US
United States
Prior art keywords
nip
skin
roller
buffing
conveying roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00359276A
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English (en)
Inventor
S Repetto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RIZZI L AND C SpA
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RIZZI L AND C SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RIZZI L AND C SpA filed Critical RIZZI L AND C SpA
Application granted granted Critical
Publication of US3851423A publication Critical patent/US3851423A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/44—Mechanical treatment of leather surfaces
    • C14B1/46—Fluffing, buffing, or sanding

Definitions

  • ABSTRLACT a The inventlon disclosed relates to a machine for buff- [52] US Cl. 51/78 51/165 9 69/42 ing skins or like materials which machine includes [51 1 Int Cl "1324b 37/00 49/08 means for increasing the buffing depth either manually [58] Fieid "69/38 51/165 9 78 or automatically by advance of the skin itself, or like 5 material, in the machine.
  • This invention relates to a feed through buffing machine having means for increasing the buffing depth, which means is controllable either manually or automatically by advance of the skin or like material itself in the machine.
  • continuous buffing machines for skins or like materials include a driven conveyor roller which is covered with elastic material such as rubber; a freely rotating retaining roller, the radial position of which, relative to the axis of the conveyor roller, is adjustable; and a driven buffing roller which is covered with an abrasive material or otherwise drives a continuous strip of abrasive material tensioned between such a roller and a tensioning or idler roller.
  • the skin, or like material, compressed by a retaining roller against the conveyor roller, is driven towards the buffing roller and is acted upon thereby.
  • the buffing roller To enable the buffing roller to perform effectively, it has to act with appreciable pressure on the material being processed. This pressure is determined by the processing depth, which depends on the distance between the peripheries of the two rollers, on the thickness of the material being processed, and on the elasticity of the covering of the conveyor roller.
  • the skin or like material, during the buffing process, is not driven forward by the abrasive roller, but continues to advance with the peripheral speed of the conveyor roller. This occurs even if the speed of the buffing roller is appreciably greater than that of the conveyor roller, and is due to the fact that the skin or related material strongly adheres to the elastic covering on the conveyor roller under the pressure exerted thereon from the other two rollers.
  • This increase of working space between the conveyor roller and the buffing roller may be accomplished by including in a buffing machine having a conveying roller provided with rotary drive, a retaining roller freely rotatable, and a polishing or buffing abrasive roller, the further provisions in combination therewith of a rocker lever disposed for carrying the conveying roller and pivoted to move the axis of the conveying roller towards or away from the axis of the buffing roller; a hydraulic thrust means in association with the conveying roller with an adjustable hydraulic first valve, a sliding memberof the first valve being actuated by the conveying roller lever in such manner that with every movement of the conveying roller axis, there is a corresponding movement of the sliding member to supply fluid under pressure to the thrust means for restoring the conveying roller to a predetermined position.
  • the distance between the peripheries of the conveying roller and the buffing roller tends to remain constant notwithstanding variations in the thickness of skins, for example, being processed by elements forming the present invention.
  • an oscillating lever and associated pistons and valves it is possible to vary the space between the conveying roller and the buffing roller in a predetermined amount and thereby alter the pressure and action of the buffing roller on the skin being processed.
  • the buffing roller may be suitably operated with an abrasive belt or by using an abrasive coating thereon in either regard with abrasiveness as desired.
  • a constant pressure balance tends to be provided by one or more valves relative pistons and levers which function with support of the rollers despite the thickness of the material being processed.
  • the means for increasing the buffing depth may be either manually or automatically performed as desired.
  • Conveying roller 1 is carried by lever 8 which is pivoted about axis 9. At end 8a of the lever, there is provided a projection 10 having, if desired, a contact roller which rests on the free end of piston rod 11 of a hydraulic thrustor which includes piston 12 and cylinder 13, the latter being supplied with pressure fluid via pipes 14 and 15.
  • a first slide valve 16 is axially adjustable relative to the base of the machine by means of threaded spindle l7 movable relative to threaded collar 18 upon rotation of the threaded collar by gear 19 and hand wheel 20.
  • the threaded collar is axially immovable relative to the base of the machine 21.
  • Valve 16 has sliding member 22 carrying lands 22a, 22b and urged upwardly by spring 23.
  • the valve 16 is connected by pipe 24 to a source of pressure fluid (not shown), by pipes 25 and 26 to a discharge pipe 27, and by outlets 14a and a to supply pipes 14 and 15 respectively, the pressure fluid causing downward or upward movements of the piston 12 when applied through outlets 14a and 15a, respectively.
  • Sliding member 22 is urged by spring 23 into contact with an eccentric 28 carried on arm 29 which is connected to end 8b of lever 8.
  • Arm 29 includes cylinder 30 in which piston 31 slides, the piston rod 32 of which is attached to lever 33 connected to operate with eccentric 28. Movement of one end of lever 33 is limited by stop 34 which may be secured in various positions 35 along extension arm 36 connected to arm 29.
  • Cylinder 30 is connected by pipes 37 and 38 to second valve 39 which is connected to a pressure source 40 and to sump 41.
  • Second valve 39 is operated electrically by a solenoid.
  • the first requirement is to adjust the position of valve 16 by means of hand wheel and associated members such that valve ports 14b and 15b are blocked by lands 22a and 22b when the desired space for processing a desired depth on the series of skins is established between conveying roller 1 and buffing roller 3.
  • the distance between the peripheries of conveying roller 1 and buffing roller 3 tends to be kept constant even if the thickness of the skins P varies appreciably.
  • An increase in the thickness of skin P causes a lowering of end 8a of lever 8 in the direction of the arrow C, and a corresponding rise of the eccentric 28 connected to the other end 812 of the lever 8.
  • Sliding member 22 is urged by spring 23 to follow the rising movement of eccentric 28. Consequently, land 22a opens port 15b to receive fluid pressure from inlet 24 while land 22b connects port 14b to outlet 26. Pressure of the fluid through pipe 15 enters the lower end of cylinder 13 and urges piston 12 upwardly so that lever 8 moves in the direction of the arrow D. This movement lowers the eccentric 28 and sliding member 22 until both ports 15b and 14b are closed again, thus resetting the position of conveying roller 1.
  • Piston 31 is displaced to the right until pivoting lever 33 comes into contact with stop 34. Such movement displaces sliding member 22 downwardly, connecting port 15b to outlet and port 14b to feed pipe 24. A downward movement of piston 12 correspondingly results and conveying roller 1 follows, while eccentric 28 is raised until it reaches a new position of equilibrium relative to sliding member 22. This new position results in an increase in the distance between conveying roller 1 and buffing roller 3 with consequent reduction of pressure on skin P. This action, therefore, avoids the turning-over of the freed end of skin P and avoids undesired processing of the wrong side of the skin.
  • the working space between the conveying roller and the buffing roller may be varied by a predetermined amount and thereby alter the pressure and hence the action of the buffing roller on the skin such that processing waste by turning-over of the freed end of skin P is avoided.
  • a machine for buffing skins which comprises, in combination:
  • a retaining roller defining a nip with the conveying roller, the skin being conveyed through the nip
  • a skin buffing roller defining an adjustable nip with the conveying roller, the skin being buffed in the adjustable nip by the buffing roller,
  • a hydraulically operated thrust means arranged in contact with the one rocker lever arm for effectuating the pivotal movement thereof to provide a basic nip adjustment
  • a first valve in the hydraulic supply conduit means for controlling the supply of hydraulic pressure fluid to the thrust means including a. a sliding member operatively associated with the other rocker lever arm and axially moved thereby upon pivotal movement of the lever in correspondence to the corresponding nip adjustment, the axial movement of the sliding valve member controlling the hydraulic pressure fluid supply to the thrust means to restore the skin conveying roller to the basic nip adjustment.
  • the skin buffing machine of claim 2 further comprising a second hydraulic fluid supply conduit means and a second valve therein, the second conduit means being connected to the hydraulically operated sliding member adjusting means for operating the adjusting means and thereby the variation of the basic nip adjustment.
  • the skin buffing machine of claim 2 further comprising a lever pivotal by the hydraulically operated means and carrying the eccentric, and an adjustable stop limiting the pivotal movement of the lever.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00359276A 1972-05-27 1973-05-11 Skin dressing machine Expired - Lifetime US3851423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT24968/72A IT955947B (it) 1972-05-27 1972-05-27 Dispositivo per l incremento del lo spessore di lavorazione in mac chine per la smerigliatura delle pelli o simili

Publications (1)

Publication Number Publication Date
US3851423A true US3851423A (en) 1974-12-03

Family

ID=11215290

Family Applications (1)

Application Number Title Priority Date Filing Date
US00359276A Expired - Lifetime US3851423A (en) 1972-05-27 1973-05-11 Skin dressing machine

Country Status (6)

Country Link
US (1) US3851423A (no)
CS (1) CS168656B2 (no)
DE (1) DE2323861A1 (no)
FR (1) FR2189514B1 (no)
GB (1) GB1421612A (no)
IT (1) IT955947B (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5312569A (en) * 1991-10-30 1994-05-17 Poly-Optical Products, Inc. Method for marring fiber optic substrates

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041865A (en) * 1959-09-21 1962-07-03 Rizzi & Co Spa Luigi Device for adjusting the thickness in rotary tannery machines
GB1167223A (en) * 1966-02-04 1969-10-15 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041865A (en) * 1959-09-21 1962-07-03 Rizzi & Co Spa Luigi Device for adjusting the thickness in rotary tannery machines
GB1167223A (en) * 1966-02-04 1969-10-15 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5312569A (en) * 1991-10-30 1994-05-17 Poly-Optical Products, Inc. Method for marring fiber optic substrates
US5499912A (en) * 1991-10-30 1996-03-19 Poly-Optical Products, Inc. Apparatus for marring fiber optic substrates

Also Published As

Publication number Publication date
GB1421612A (en) 1976-01-21
CS168656B2 (no) 1976-06-29
FR2189514A1 (no) 1974-01-25
DE2323861A1 (de) 1973-12-06
FR2189514B1 (no) 1976-11-12
IT955947B (it) 1973-09-29

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