EP0368233B1 - Machine for perching leather - Google Patents
Machine for perching leather Download PDFInfo
- Publication number
- EP0368233B1 EP0368233B1 EP89120583A EP89120583A EP0368233B1 EP 0368233 B1 EP0368233 B1 EP 0368233B1 EP 89120583 A EP89120583 A EP 89120583A EP 89120583 A EP89120583 A EP 89120583A EP 0368233 B1 EP0368233 B1 EP 0368233B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- leather
- perching
- pegs
- counterplate
- 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
Links
- 239000010985 leather Substances 0.000 title claims description 40
- 208000028804 PERCHING syndrome Diseases 0.000 title claims description 38
- 230000035515 penetration Effects 0.000 claims description 2
- 238000009499 grossing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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
- C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
Definitions
- the invention concerns a perching machine for leather suited to combine the perching action with the smoothing action.
- perching is a finishing process for leather by means of which the leather acquires characteristics of softness, or, as it is called in the specific technical lingo a good "handle”.
- the perching process consists in running the leather to be treaded, which is held between two elastic conveyor belts, through a set of pegs which force it to alternatively enter into and exit from the openings of a grid. Thereby on various spots of the leather surface an alterated traction action is created, which is repeated at extremely short intervals, which yields to it the required characteristics of softness and "handle".
- the DE-A 35 00 684 discloses a perching machine having two stretching plates both provided with pegs. The stretching operation is made in two direction perpendicular each other.
- FR-A-2332943 discloses a perching machine according to the preamble of claim 1 in which the leather is treated by two plates with pegs wherein the perching action is prevalent and the smoothing action happens only when the driving rollers slow down the translation of the leather.
- the purpose of the present invention is to develop a perching machine which will permit to obtain leather with characteristics of softness and handle comparable to those which are obtained by means of the manually operated finishing machine used in the artisan-type working processes. Not the least purpose is to provide a perching machine permitting production quantities which are acceptable for modern industrialized productions.
- Yet another purpose of the invention is to provide a perching machine suited to combine the perching action with the smoothing action.
- a perching machine is realized which makes it possible to obtain a degree of softness and handle of the leather, comparable with those which can be obtained by means of manually operated machines of the artisan type, while processing a production quantity of the industrial type.
- the machine according to the invention which is indicated as a whole with 1 in Fig. 1, comprises a base supporting the perching units 3, 4, 5, 6. It will be remarked that Fig. 1 shows four perching units, but it is understood that the perching machine 1 may comprise any number of perching units. Moreover, in the description given hereafter, reference will be made only to the perching unit indicated with 3, as far as the components are concerned, but it is understood that the perching units 4, 5, 6 comprise the same components as unit 3.
- the perching unit 3 consists of a plate with pegs 9 comprising a base-plate 8 on top of which are attached the pegs 9.
- the horizontal plane 10 of the base-plate 8 is parallel to a drilled counterplate 11, positioned over the plate with pegs 9 and presenting a plurality of holes 12, each of which is penetrated by a peg 9.
- the plate with pegs 9 undergoes an alternated vertical movement following direction 13 which is trasmitted to it by cam 14 driven by a motor (not represented in the drawing), which by driving it through shaft 15 causes it to rotate, for instance, in the direction indicated by arrow 16.
- cam 14 While rotating, cam 14 goes to interfere against the lower base 17 of the base-plate 8, thereby causing it go up or down, depending on the position of its excentricity during its rotation.
- each perching unit is provided with an articulated quadrilateral 50 comprising an upper crank 51, a lower crank 52 and a drag link 53.
- the small end 54 of crank 52 and the small end 55 of crank 51 are aligned with each other following the vertical direction 56 and they are attached to the base 2 of the machine.
- head 58 of the drag link is connected with the head 59 of the lower crank 52, while the head 60 of the drag-link is connected with the head 61 of the upper crank 51.
- Fig. 2 shows, in fact, peg 30, which in the position indicated with an unbroken line is in its position of maximum penetration within hole 32, while the position represented with broken lines shows the peg during its ascending stage while it is entering hole 32.
- the perching machine according to the invention performs on leather 20 being threated a stretching of the fibers combined with a smoothing action of its surface.
- the lifting of peg 30,9 forces leather 20 against the edges 33 and 34 of hole 32, thereby creating a stretching action on leather 20 along stretch 71 acquiring a curve 70 and comprised between the edges 33 and 34 of hole 32.
- the action of the articulated quadrilateral 50 is such as to cause a displacement in direction 40 of peg 30,9, which causes a smoothing effect on the surface of leather 20 and, therefore, a directional recovery of the stretched fibers.
- the perching units are not always simultaneously in contact with leather 20, which is being treated and moves forward in direction 23, but they are in contact with it alternatively two by two.
- the perching units which are in contact with the leather are the intermediate units 4 and 5 while the outer perching units 3 and 6 will engage the leather during the subsequent half-turn of cam 14.
- the first purpose has been fulfilled, i.e. the realization of a perching machine suited to give leather 20, which is being treated, a high degree of softness and a "handle" which is comparable with the "handle” obtained with manually operated machines of the artisan type, which are no longer used. It has, in fact, being seen that through cam 14 and the articulated quadrilateral 50 it is possible to perform an alternated combined vertical, rotating and translating movement of the pegs 9, which very faithfully reproduces the work of the mentioned manually operated machines and which gives leather 20 under treatment the same characteristics of softness, flexibility, elasticity or more in general a good "handle".
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)
Description
- The invention concerns a perching machine for leather suited to combine the perching action with the smoothing action. It is known that "perching" is a finishing process for leather by means of which the leather acquires characteristics of softness, or, as it is called in the specific technical lingo a good "handle". It is known that the perching process consists in running the leather to be treaded, which is held between two elastic conveyor belts, through a set of pegs which force it to alternatively enter into and exit from the openings of a grid. Thereby on various spots of the leather surface an alterated traction action is created, which is repeated at extremely short intervals, which yields to it the required characteristics of softness and "handle".
- An inconvenience caused by said perching machines is represented by the fact that the pegs only exert on the leather a traction force with an alternate verse but in a single direction which does not yield to it that special "handle" which was obtained when manual treatments were applied back when the process was performed by artisans. The machines employed then consisted essentially of a rotating roller on the surface of which the leather to be treated was stretched. Two metal blades were present on two generating lines of the roller and they were pressed against the roller while it was rotating, whereby they applied on the leather being treated a traction action as well as a smoothing action of its surface. The thus obtained handle was much better that the one which is now yielded by the perching machines used at present.
- The DE-A 35 00 684 discloses a perching machine having two stretching plates both provided with pegs. The stretching operation is made in two direction perpendicular each other.
- FR-A-2332943 discloses a perching machine according to the preamble of claim 1 in which the leather is treated by two plates with pegs wherein the perching action is prevalent and the smoothing action happens only when the driving rollers slow down the translation of the leather.
- The purpose of the present invention is to develop a perching machine which will permit to obtain leather with characteristics of softness and handle comparable to those which are obtained by means of the manually operated finishing machine used in the artisan-type working processes. Not the least purpose is to provide a perching machine permitting production quantities which are acceptable for modern industrialized productions.
- Yet another purpose of the invention is to provide a perching machine suited to combine the perching action with the smoothing action.
- The above-mentioned purposes and others which will be better explained hereafter are fulfilled by the realization of a perching machine for leather according to claim 1 of the present invention.
- Advantageously, according to the invention a perching machine is realized which makes it possible to obtain a degree of softness and handle of the leather, comparable with those which can be obtained by means of manually operated machines of the artisan type, while processing a production quantity of the industrial type.
- Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter, and from the drawings, wherein:
- Fig. 1 shows the longitudinal cross-section of the part of the perching machine of the invention, which concerns the area of the plates with pegs and their opposed drilled conterplates;
- Fig. 2 shows the magnified detail of a peg acting on the leather within the hole which is suited to receive it.
- The machine according to the invention, which is indicated as a whole with 1 in Fig. 1, comprises a base supporting the
perching units perching units unit 3. - The
perching unit 3 consists of a plate with pegs 9 comprising a base-plate 8 on top of which are attached the pegs 9. - The
horizontal plane 10 of the base-plate 8 is parallel to a drilledcounterplate 11, positioned over the plate with pegs 9 and presenting a plurality ofholes 12, each of which is penetrated by a peg 9. - The plate with pegs 9 undergoes an alternated vertical
movement following direction 13 which is trasmitted to it bycam 14 driven by a motor (not represented in the drawing), which by driving it throughshaft 15 causes it to rotate, for instance, in the direction indicated byarrow 16. - While rotating,
cam 14 goes to interfere against thelower base 17 of the base-plate 8, thereby causing it go up or down, depending on the position of its excentricity during its rotation. - Leather 20 to be treated is fed into the perching machine by arranging it horizontally between the pegs 9 and the
counterplate 11. - It is held between a top
elastic belt 21 and another bottomelastic belt 22 and it is sent into the machine in the direction indicated byarrow 23. - While
cam 14 is revolving, the plate with pegs 9 will go up and down, so that, as a consequence, each of its pegs 9 will penetrate eachhole 12 of thecounter-plate 11. - It is obvious that during said vertical upward and downward movements of each peg of
plate 7,leather 20 held between the guidingelastic belts counterplate 11, as shown in Fig. 2. - In fact, it can be observed in Fig. 2, that the upward thrust of
peg 30,9 followingdirection 31 causesleather 20, held between the topelastic belt 21 and the bottom one 22, to penetrate withinhole 32. The compressing action ofpeg 30 againstleather 20 and the rubbing caused by saidpeg 30,9 on the leather by fretting it againstedge 33 when enteringhole 32 andedge 34 when exiting from the same hole creates on theleather 20 being treated a stretching of its fibers and, as a consequence, a softering of the same. Sincecam 14 turns at a speed of several revolutions per minute and since a plurality of pegs 9 are attached to thetop surface 10 of thebase plate 8, it can be understood that the number of traction and stretching actions which the leather undergoes per minute is very large. It is, in fact, this very quick sequence of tension stages followed by relaxed stages which causes a yield of the leather, which thus acquires the desired characteristics of softness and handle. It is obvious thatleather 20 exits fromhole 32 thanks to the elastic back-spring of thebelts leather 20 during the downward movement ofpeg 30,9. - During its vertical ascent the base-
place 8 of the plate with pegs 9 also undergoes a horizontal displacement in the direction indicated with 40 in Fig. 2. By observing Fig. 1 it can be seen that each perching unit is provided with an articulated quadrilateral 50 comprising anupper crank 51, alower crank 52 and adrag link 53. Thesmall end 54 ofcrank 52 and thesmall end 55 ofcrank 51 are aligned with each other following thevertical direction 56 and they are attached to thebase 2 of the machine. On theother hand head 58 of the drag link is connected with the head 59 of thelower crank 52, while thehead 60 of the drag-link is connected with thehead 61 of theupper crank 51. Said heads of the drag-link and of the cranks are also connected with the base-plate 8 of the perching unit. It is the presence of this articulated quadrilateral 50 which, during the revolving movement ofcam 14 and the insuing vertical movement of the plate with pegs 9, impresses to it a horizontal movement indirection 40, as can be observed in Fig. 2, although the horizontality of theupper surface 10 of the base-plate 8 is maintained. - It is the combination of these two movements, in
direction 13 and indirection 40, which submit each peg 9, attached to the base-plate 8, to a combined rotating-translating movement having a trajectory which is similar tocurve 70 along which thesandwich comprising leather 20, which is being treated, and the twoelastic belts peg 30,9. - Fig. 2 shows, in fact,
peg 30, which in the position indicated with an unbroken line is in its position of maximum penetration withinhole 32, while the position represented with broken lines shows the peg during its ascending stage while it is enteringhole 32. - Thus, it is easy to understand that, contrary to what happens in the perching machines of the known type, the perching machine according to the invention performs on
leather 20 being threated a stretching of the fibers combined with a smoothing action of its surface. In fact, as has already been mentioned, the lifting ofpeg 30,9forces leather 20 against theedges hole 32, thereby creating a stretching action onleather 20 alongstretch 71 acquiring acurve 70 and comprised between theedges hole 32. Moreover, the action of the articulated quadrilateral 50 is such as to cause a displacement indirection 40 ofpeg 30,9, which causes a smoothing effect on the surface ofleather 20 and, therefore, a directional recovery of the stretched fibers. Since, as has already been remarked, the two actions invertical direction 31 and inhorizontal direction 40 are simultaneous, the actions of yielding of the leather and the smoothing of its surface occur at the same time and for as many times per minute as is the number of r.p.m. ofcam 14 multiplied by the number of pegs 9 arranged onsurface 10 of the base-plate 8 and multiplied still by the number of the perching units. - As can be observed in Fig. 1, the perching units are not always simultaneously in contact with
leather 20, which is being treated and moves forward indirection 23, but they are in contact with it alternatively two by two. Thus, in the example represented in Fig. 1 the perching units which are in contact with the leather are theintermediate units 4 and 5 while theouter perching units cam 14. - On the basis of what has been described, it can be understood that all the purposes proposed by the invention have been fulfilled.
- The first purpose has been fulfilled, i.e. the realization of a perching machine suited to give
leather 20, which is being treated, a high degree of softness and a "handle" which is comparable with the "handle" obtained with manually operated machines of the artisan type, which are no longer used. It has, in fact, being seen that throughcam 14 and the articulated quadrilateral 50 it is possible to perform an alternated combined vertical, rotating and translating movement of the pegs 9, which very faithfully reproduces the work of the mentioned manually operated machines and which givesleather 20 under treatment the same characteristics of softness, flexibility, elasticity or more in general a good "handle". - Since the described machine carries out the process in the industrial fashion yielding high production quantities, it is understood also that the other purpose is fulfilled, i.e. the purpose of obtaining the desired above-mentioned quality characteristics while producing quantities suited for an industrial-type production.
- During the construction stage changes and modifications of the machine may occur to those skilled in the art.
- For instance, it is possible to vary the distances of the
cranks links 53 of the articulated quadrilateral with the purpose of changing the length of the movements indirection 40. In the same way it will also be possible to vary the excentricity ofcam 14, and the number of the pegs 9 attached to the base-plate 8, their shape and their arrangement. - Nothing would change if the pegs 9 were attached to
plate 11 and theholes 12 were made inplate 8. In fact, the leather would thus undergo an identical treatment. - It is, therefore, understood that said changes and modifications would not exceed the scope of the invention such as it is described in the following claims.
Claims (4)
- Perching machine for treating leather, comprising- at least one plate (8) with a plurality of protruding pegs (9), which plate is provided with an alternated vertical movement (13),- at least one counterplate (11) facing the plate (8) and being provided with stretching means,
characterized in that- the counterplate (11) is in a fixed position relative to the moving plate (8),- the stretching means in the counterplate (11) are holes (12) to be penetrated by the pegs (9),- the plate (8) is connected with an articulated quadrilateral (50) in order to perform, in combination with the alternated penetration movement, a rotating-translating movement, thereby maintaining the plate (8) always parallel to the fixed counterplate (11),- the positive feed movement of the leather (20) is executed by two elastic conveyor belts (21, 22) guiding the leather (20) between the plate (8) and the counterplate (11). - Perching machine according to claim 1, characterized in that the articulated quadrilateral (50) presents an upper crank (51) and a lower crank (52) the small ends (55, 54) of which have their rotation pivots attached to the base (2) of the perching machine.
- Perching machine according to claim 2, characterized in that the upper crank (51) and the lower crank (52) have their heads (61, 59) connected with each other by means of a drag-link (53).
- Pearching machine according to claim 3, characterized in that the crank head (61) of the upper crank (51) has its rotation pivot attached to the plate (7) with pegs (9).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8885662A IT1225572B (en) | 1988-11-07 | 1988-11-07 | STAPLING PROCESS FOR LEATHER AND MACHINE SUITABLE TO CARRY OUT SUCH PROCEDURE. |
IT8566288 | 1988-11-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0368233A2 EP0368233A2 (en) | 1990-05-16 |
EP0368233A3 EP0368233A3 (en) | 1990-07-04 |
EP0368233B1 true EP0368233B1 (en) | 1994-03-30 |
Family
ID=11329661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89120583A Expired - Lifetime EP0368233B1 (en) | 1988-11-07 | 1989-11-07 | Machine for perching leather |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0368233B1 (en) |
DE (1) | DE68914250T2 (en) |
ES (1) | ES2053916T3 (en) |
IT (1) | IT1225572B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1236376B (en) * | 1989-10-13 | 1993-02-25 | Cartigliano Off Spa | METHOD AND MACHINE FOR SOFTENING AND IRONING LAMINARY PRODUCTS, PARTICULARLY TANNED LEATHER. |
IT1247078B (en) * | 1991-03-14 | 1994-12-12 | Cartigliano Off Spa | MULTIPLE SWING PLATE MACHINE FOR SOFTENING AND IRONING INDUSTRIAL AND SIMILAR LEATHER. |
IT1280605B1 (en) * | 1995-11-06 | 1998-01-23 | Michele Zanette | MODULAR HEAD AND PALISSONING MACHINE, PARTICULARLY FOR IRONING AND SOFTENING INDUSTRIAL LEATHER AND SIMILAR PRODUCTS |
IT1287338B1 (en) * | 1996-09-13 | 1998-08-04 | Antonio Polato | DEVICE FOR THE CONTINUOUS REGULATION OF THE WORKING PRESSURE FOR STICKER PLATE MACHINES. |
AU6257798A (en) * | 1997-01-31 | 1998-08-25 | Board Of Trustees Of The Leland Stanford Junior University | Treatment of arrhythmias via inhibition of a multifunctional calcium/calmodulin-dependent protein kinase |
IT1308153B1 (en) * | 1999-05-10 | 2001-11-29 | Cartigliano Off Spa | STRIKING MACHINE WITH HINGED PLATES. |
IT1313522B1 (en) * | 1999-05-27 | 2002-07-24 | Antonio Antoniazzi | ELASTIC CONVEYOR BELT WITH CONDUCTIVE FIBERS FOR STATIC DIELECTRICITY DISCHARGE AND STACKING MACHINE WITH SAID CARPET. |
ITVI20010220A1 (en) | 2001-10-23 | 2003-04-23 | Cartigliano Off Spa | METHOD AND LINE FOR CONTINUOUS ENLARGEMENT OF LEATHER AND OTHER SIMILAR PRODUCTS |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2543412A1 (en) * | 1975-09-29 | 1977-04-14 | Dokoupil Jiri | PROCESS FOR CONTINUOUS STUDDING, SMOOTHING AND FIBER LOOSENING OF FLAT MATERIALS, SUCH AS LEATHER, SYNTHETIC LEATHER, SYNTHETIC FILMS AND AE, AS WELL AS DEVICE FOR CARRYING OUT THIS PROCESS |
GB1561759A (en) * | 1975-11-26 | 1980-02-27 | Turner Gmbh Maschf | Processing of leather |
DE3500684A1 (en) * | 1985-01-11 | 1986-07-17 | Wolf 8403 Bad Abbach Ciecierski | Leather-working machine |
-
1988
- 1988-11-07 IT IT8885662A patent/IT1225572B/en active
-
1989
- 1989-11-07 EP EP89120583A patent/EP0368233B1/en not_active Expired - Lifetime
- 1989-11-07 DE DE68914250T patent/DE68914250T2/en not_active Expired - Fee Related
- 1989-11-07 ES ES89120583T patent/ES2053916T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0368233A3 (en) | 1990-07-04 |
DE68914250D1 (en) | 1994-05-05 |
EP0368233A2 (en) | 1990-05-16 |
DE68914250T2 (en) | 1994-11-17 |
ES2053916T3 (en) | 1994-08-01 |
IT8885662A0 (en) | 1988-11-07 |
IT1225572B (en) | 1990-11-22 |
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