US3789632A - Automatic thickness regulator for skin-shaving machines - Google Patents

Automatic thickness regulator for skin-shaving machines Download PDF

Info

Publication number
US3789632A
US3789632A US00292095A US3789632DA US3789632A US 3789632 A US3789632 A US 3789632A US 00292095 A US00292095 A US 00292095A US 3789632D A US3789632D A US 3789632DA US 3789632 A US3789632 A US 3789632A
Authority
US
United States
Prior art keywords
roller
skin
control
piston
shaving
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
US00292095A
Other languages
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.)
Luigi Rizzi and Co SpA
Original Assignee
Luigi Rizzi and Co 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 Luigi Rizzi and Co SpA filed Critical Luigi Rizzi and Co SpA
Application granted granted Critical
Publication of US3789632A publication Critical patent/US3789632A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C14B1/02—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather
    • C14B1/04—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using slicking, scraping, or smoothing-out cylinders or blades fixed on supports, e.g. cylinders, in a plane substantially at right angles to the working surface
    • C14B1/10—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using slicking, scraping, or smoothing-out cylinders or blades fixed on supports, e.g. cylinders, in a plane substantially at right angles to the working surface in machines with drums with cylindrical, conical, or similar surfaces for supporting the whole working piece
    • 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
    • C14B2700/00—Mechanical treatment or processing of skins, hides or leather in general; Pelt-shearing machines; Making driving belts; Machines for splitting intestines
    • C14B2700/02—Machines or devices for treating skins, hides and leather using cylinders with helical blades and a tensioning cylinder, cylindrical or conical working table

Definitions

  • ABSTRACT In a skin shaving machine, a mechanism is provided for automatically regulating the thickness of the skin Foreign Application Priority Data Dec. 15, 1971 being processed.
  • a shaped surface of a governing piston, shaped so as to present zones of different surface area cooperates with a feeler.
  • the surface area varia- 69/42 tion of the core keeps into account the thickness trend Cl4b 17/00 d 69/10 42 of the several portions of a Skln, V1Z. hea neck, trunk, hmdquarters.
  • skin-shaving machines generally comprise two rollers, between which the skins to be shaved are caused to pass.
  • a first roller hereinafter called pressure roller is usually made of smooth steel and is rotated at a low speed
  • the second roller which will be called shaving drum hereinafter, carries on its peripheral surface two sets of blades which are arranged along right and left-handed spirals which converge towards the midpoint of the drum, the latter being rotated at a high speed.
  • the skin has features which are sharply different (a reduced elasticity) with respect to the trunk area and that, in correspondence with the head, also the width is considerably reduced.
  • These facts involve, on the one hand, a lesser return of the skin (in those regions) to a greater thickness upon shaving, and, on the other hand, since the stretching force imparted by the blades to the areas of reduced width is obviously lesser, the result is a less pronounced thickness reduction prior to shaving and thus a greater amount of shaven out material.
  • the consequence is, in the areas indicated above, a final thickness of the skin undesirably reduced as compared with that of the trunk region.
  • the shaving problem for the neck and head regions has been solved by a number of manufacturers by means of a device which, as controlled by an operator, gradually increases the nip between the roller and the drum during progress of the shaving operation in those areas (usually the last to be engaged by such an operation), so as to allow for both the different elasticity and the different width (more or less gradually decreasing) of the skin.
  • An object of the present invention is thus to provide a device which is capable of automatically varying the nip between the roller and the drum during shaving of the hindquarter regions of a skin and of automatically restoring the nip to the normal magnitude again as the shaving of the trunk area is being started.
  • the device according to the invention has now been devised, which is characterized in that it comprises a slidable piston which is responsive to the closing of the machine for starting the shaving of a skin so as to be gradually shifted from a first position where a feeler engages the initial area of a shaped region, to a second position where the feeler engages the final portion of said shaped surface, the feeler being operatively connected either to the roller or the drum so as to cause them gradually to approach as a result of the shift of the feelers engagement from the initial portion to the final portion of the shaped surface of said core.
  • FIG. 1 shows a skin shaving machine incorporating a thickness regulator according to this invention.
  • FIG. 2 is a plan view showing a so-called calfs halfskin.”
  • FIG. 3 is a longitudinal cross-section view showing the way in which the thickness of the half skin of FIG. 2 is varied when passing through a shaving machine.
  • the machine shown in FIG. 1 comprises, in the first place, a smooth pressure roller 1 and a shaving drum 2 equipped with a number of shaving blades 3, the latter being arranged along two sets of right and left helixes which converge in the mid region of the drum.
  • the pressure roller 1 is supported for rotation by a supporting member 4 journalled at 5 to the fixed frame (not shown) of the machine.
  • the control of the shifts of the supporting member 4 is entrusted to a connecting rod 6 which is 'eccentrically mounted on a shaft 7.
  • a pinion 8 which is in mesh with a rack portion of a piston 9 sliding within a cylinder 10.
  • the end spaces of the cylinder 10 can be alternatingly connected to a duct 11 for feeding oil under pressure, or, as an alternative, to a dump pipe consistently with the angular position of the movable core of a valve 12, the latter being controlled by an operator through a control 13.
  • the pressure roller 1 is maintained in engagement with a motor-driven roller 14, the latter being supported by a lever 15, pivoted at 16.
  • a spring 17 has the task of ensuring that the engagement between the two rollers 1 and 14 be maintained.
  • the shaving drum 2 which is rotated at a high speed by a prime mover unit not shown in the drawing, is supported for rotation, in turn, by a supprting member 18, which is fulcrumed at 19 and rests against the jutting stem 20 of a piston 21 of a hydraulic jack 22.
  • the position of the piston 21 is controlled at every instant of time by a valve 23, whose task is to govern the connection of a duct 24 for oil under pressure, and of a discharge duct 25, with two ducts, 26 and 27, which are connected to the upper chamber and the lower chamber, respectively, of the hydraulic jack 22.
  • a stem 34 coaxially with which there is mounted, so as to be allowed to be rotated only with respect to the valve body 28, an externally screwthreaded sleeve 35 having affixed to its end a handwheel 36.
  • the sleeve 35 engages a nut 37 which is connected with a fixex supporting member 38 so as to be rotated only about its own axis.
  • a manipulation lever 39 is mounted on the nut 37.
  • the piston 42 is housed in a cylinder 43 (integral with the supporting member 18), whose bottom chamber is connected to the uppermost chamber of the cylinder 10 by means of a duct 44, and the top chamber being connected to the feeding duct 11 by means of a duct 45 having therein an adjustable throttling valve 46.
  • the control 13 is manipulated at the outset so as to bring the movable spool of the valve 12 to the position which connects the bottom chamber of the cylinder 10 with the feeding duct 11 and the top compartment of the cylinder 10 with the outlet.
  • the piston 9 is raised, so as to cause, by means of the pinion 8, a rotation of the shaft 7: the latter causes, through the connecting rod 6, the rotation in the clockwise direction of the supporting member 4, to shift the pressure roller 1 away of the shaving drum 2.
  • the open machine position is reached.
  • connection brought about by the valve 12 between the top chamber of the cylinder 10 and the outlet involves, at the same time, the connection of the bottom chamber of the cylinder 43 to the outlet, so that the piston 42, as urged by the pressure in the top chamber of the cylinder 43, is shifted downwards to the position defined by its abutment against a set screw 48. Consequently, by overcoming the bias of the spring 41, the feeler is shifted towards the right (as viewed in FIG. 1) and this causes a like shift of the spool 29 in the interior of the valve body 28 (whose position is set by the handwheel 36).
  • the skin is engaged between a roller and a drum which are set at a distance which is greater than that which would have otherwise been determined with the handwheel 36, and, exactly, at such a distance as to allow for the thicker thickness of the skin in the hindquarter region (FIG. 3) which is determined by the reduced stretching force imparted by the blades 3 to that skin area.
  • the value of the thickness incease is adjustable with the screw 48.
  • the gradual movement of the shaving drum towards the pressure roller can have a basic regulation through the determination of an appropriate shape of the piston 42 and a further adjustment of the valve 46, whereas the magnitude of the initial gap can be adjusted by the screw 48, the whole in such a way as to adapt the gap differentials between the roller and the drum to the trend of skin thickness in the hindquarter area, the final object being to obtain, on completion of the shaving stage, an extremely satisfactory thickness evenness between the hindquarter and the trunk region of the skin.
  • the regulation of the thickness in the trunk region 51 and the head area 52 is carried out, conversely, in a conventional way by means of the lever 39, whose rotations cause the axial shift of the sleeve 35 and the valve body 28, the result being a gradual movement of the shaving drum 2 farther and farther away of the pressure roller.
  • a skin shaving machine of the type including cooperating first and second rollers between which a skin is fed to effect shaving thereof, said rollers including a shaving roller and a pressure roller, means mounting said first roller between an open position for the reception of a skin between said rollers and a closed position wherein said rollers are operative to shave a skin, first control means for selectively positioning said first roller in one of said closed and open positions, means mounting said second roller for movement toward and away from said first roller, second control means for effecting movement and positioning of said second roller; an automatic thickness regulating device operatively connected to said second control means for actuating said second control means for effecting the gradual movement of said second roller towards said first roller during an initial portion of a skin shaving operation, said automatic thickness regulating device including a movable control member coupled to said first control means for movement in response to actuation of said first control means to move said first roller to said closed position.
  • a regulating device according to claim 1 wherein said control member has a shaped surface, and means coupling said control member to said second control means includes a feeler riding on said shaped surface.
  • a regulating device according to claim 2 wherein said second control means includes a control valve, and said feeler is coupled to said control valve for positioning the same.
  • a regulating device according to claim 3 wherein said second control means includes a piston for positioning said second roller, and said control valve is coupled to said piston for controlling the flow of fluid thereto.
  • a regulating device characterized in that said shaped surface is in the shape of a cone.
  • control member and said feeler are housed in bodies which are mounted on a supporting member for the shaving roller, said second control means includes a double faced piston for positioning said shaving roller and a control valve for controlling the flow of a control fluid to said piston faces, and said feeler is in engagement with said control valve for adjusting the pressure acting on the two faces of said pis ton.
  • a regulating device according to claim 1 wherein said control member is a double acting piston, and said first control means includes valve means for selecting varying fluid pressures acting on said piston.
  • a regulating device characterized in that said control member is a piston with end surfaces having different areas and is slidably housed in a hollow body which is partitioned into two chambers by said control member, the chamber confined by the end surface of said control member having the lesser surface area being constantly connected with a source of pressurized fluid, the chamber confined by the portion of said control member having the greater surface area being alternately connected to a discharge and to a source of pressurized fluid by said first control means as a function of the open machine condition and the closed machine condition, respectively, of said first roller.
  • An adjusting device characterized in that there is a duct which connects said chamber confined by the end surface of said control member having the lesser surface area with the relative source of pressurized fluid, and an adjustable throttling valve is incorporated in said duct for controlling the rate of movement of said control member.
  • An adjusting device characterized in that there is an adjustable stop for defining a first position of the movable control member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Cosmetics (AREA)
  • Dry Shavers And Clippers (AREA)
US00292095A 1971-12-15 1972-09-25 Automatic thickness regulator for skin-shaving machines Expired - Lifetime US3789632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT32432/71A IT943995B (it) 1971-12-15 1971-12-15 Regolatore automatico di spessore per macchina rasatrice di pelli

Publications (1)

Publication Number Publication Date
US3789632A true US3789632A (en) 1974-02-05

Family

ID=11235366

Family Applications (1)

Application Number Title Priority Date Filing Date
US00292095A Expired - Lifetime US3789632A (en) 1971-12-15 1972-09-25 Automatic thickness regulator for skin-shaving machines

Country Status (8)

Country Link
US (1) US3789632A (fr)
JP (1) JPS4867404A (fr)
CS (1) CS161810B2 (fr)
DE (1) DE2246733A1 (fr)
ES (1) ES406392A1 (fr)
FR (1) FR2165377A5 (fr)
GB (1) GB1355469A (fr)
IT (1) IT943995B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911703A (en) * 1973-08-08 1975-10-14 Rizzi & Co Spa Luigi Machine for processing skins or hides
CN105567882A (zh) * 2016-02-01 2016-05-11 扬州扬宝机械有限公司 去肉机的去肉胶棒调节支承及驼峰处理装置
CN114766538A (zh) * 2022-05-20 2022-07-22 盛秀香 一种机械式的驴皮加工机及其加工方法

Citations (5)

* 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
US3083559A (en) * 1961-03-09 1963-04-02 Turner Aktien Ges Maschf Splitting machines
US3276230A (en) * 1964-09-17 1966-10-04 Chas H Stehling Co Leather working machines
GB1167223A (en) * 1966-02-04 1969-10-15 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines
GB1168733A (en) * 1966-02-04 1969-10-29 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines.

Patent Citations (5)

* 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
US3083559A (en) * 1961-03-09 1963-04-02 Turner Aktien Ges Maschf Splitting machines
US3276230A (en) * 1964-09-17 1966-10-04 Chas H Stehling Co Leather working machines
GB1167223A (en) * 1966-02-04 1969-10-15 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines
GB1168733A (en) * 1966-02-04 1969-10-29 Rizzi & Co Spa Luigi Improvements in or relating to Tannery Machines.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911703A (en) * 1973-08-08 1975-10-14 Rizzi & Co Spa Luigi Machine for processing skins or hides
CN105567882A (zh) * 2016-02-01 2016-05-11 扬州扬宝机械有限公司 去肉机的去肉胶棒调节支承及驼峰处理装置
CN105567882B (zh) * 2016-02-01 2019-04-05 扬州扬宝机械有限公司 去肉机的去肉胶棒调节支承及驼峰处理装置
CN114766538A (zh) * 2022-05-20 2022-07-22 盛秀香 一种机械式的驴皮加工机及其加工方法
CN114766538B (zh) * 2022-05-20 2022-10-28 山东东阿吉祥阿胶制品有限公司 一种机械式的驴皮加工机及其加工方法

Also Published As

Publication number Publication date
JPS4867404A (fr) 1973-09-14
FR2165377A5 (fr) 1973-08-03
GB1355469A (en) 1974-06-05
DE2246733A1 (de) 1973-06-20
CS161810B2 (fr) 1975-06-10
IT943995B (it) 1973-04-10
ES406392A1 (es) 1975-09-16

Similar Documents

Publication Publication Date Title
US3789632A (en) Automatic thickness regulator for skin-shaving machines
US3306547A (en) Winding apparatus
US3121423A (en) Profile dressing device for grinding wheels
US3335687A (en) Apparatus for a hydrofoil provided with air exit apertures
SU1297715A3 (ru) Гидравлическое управл ющее устройство экструдеров дл обработки каучука литьем под давлением
US3153965A (en) Clicker die press with means to prevent platen creep
US1854226A (en) Hydraulic steering gear for ships
US3391500A (en) Fluid operated steady rest with automatic feed
US3911703A (en) Machine for processing skins or hides
US2071677A (en) Hydraulically operated grinding machine
US2894360A (en) Grinding machine-wheel wear compensating mechanism
US2448921A (en) Hydraulically operated feeding mechanism
US3041865A (en) Device for adjusting the thickness in rotary tannery machines
US3083559A (en) Splitting machines
US2254784A (en) Grinding wheel feeding mechanism
US3851423A (en) Skin dressing machine
US3047048A (en) Tire stitching apparatus
US2735420A (en) Grinding wheel truing mechanism
US2448874A (en) Hydraulically operated wheel feeding mechanism
US3276230A (en) Leather working machines
US2844074A (en) Pressure contact control for cam cutting machines
US2921414A (en) Means for infeeding a centerless grinder
GB1591567A (en) Hydraulic devicefor producing to- and-fro movement and a machine for stretching and squeezing skins incorporating such a device
US2889665A (en) Compensating device for grinding machines
US2638769A (en) Hydraulic system for driving the rotation of sundry members in machines for the working of skins and hides