SI25043A

SI25043A - Forestry winch with an improved control of assembly for the controlled winding the tow rope on a winding drum

Info

Publication number: SI25043A
Application number: SI201500190A
Authority: SI
Inventors: Iztok Špan
Original assignee: Tajfun Planina Proizvodnja Strojev D.O.O.
Priority date: 2015-08-21
Filing date: 2015-08-21
Publication date: 2017-02-28

Abstract

Namen izuma je torej brez navzven štrlečih delov, ki bi načeloma lahko ogrožali zanesljivost delovanja celotnega gozdarskega vitla in tudi varnost vsakokratnega uporabnika, možno zagotoviti takojšnjo prekinitev delovanja navijalnega bobna v zaključni fazi navijanja vlečne vrvi (1), namreč v trenutku, ko je celotna funkcionalna dolžina vlečne vrvi že navita na bobnu in se vsakokraten vlečni element (3), pritrjen na omenjeno vlečno vrv (1), približa omenjenemu zgornjemu škripčniku (2).The purpose of the invention is therefore without outwardly protruding parts which in principle could endanger the reliability of the operation of the entire forest winches as well as the safety of each user, it is possible to provide immediate interruption of the operation of the winding drum in the final phase of winding the tow rope (1), namely at the moment when the entire functional the length of the tow rope is already wound on the drum and the respective pulling element (3) attached to said tow rope (1) is approached by said upper piston (2).

Description

TAJFUN PLANINA proizvodnja strojev, d.o.o.TAYFUN MOUNTAIN MACHINE MANUFACTURING, Ltd.

MPK⁸: B 66 D 01/28MPK ⁸ : B 66 D 01/28

Gozdarski vitel z izpopolnjenim krmiljenjem sklopa za kontrolirano navijanje vlečne vrvi na navijalni bobenForestry winch with advanced control of the assembly for controlled winding of the tow rope to the winding drum

Izum na področju delovnih operacij in transporta spada k napravam za dviganje, privzdigovanje ali vleko, konkretno pa k vitlom, namreč h konstrukcijskim podrobnostim le-teh.The invention in the field of work operations and transport belongs to devices for lifting, lifting or towing, and more specifically to winches, namely to the structural details thereof.

Pri tem je izum osnovan na problemu, kako zasnovati k traktorju prigradljiv in s traktorskim pogonom gnan gozdarski vitel z okrovom in v slednjem vgrajenim navijalnim bobnom kot tudi z na omenjenem okrovu vitla pritrjenim zgornjim škripčnikom za vodenje in usmerjanjem vlečne vrvi med odvijanjem le-te z omenjenega navijalnega bobna ali navijanjem le-te na omenjen navijalni boben, pri katerem naj bi bilo brez navzven štrlečih delov, ki načeloma ogrožajo zanesljivost delovanja celotnega vitla in tudi varnost vsakokratnega uporabnika, možno zagotoviti takojšnjo prekinitev delovanja navijalnega bobna v zaključni fazi navijanja vlečne vrvi, namreč v trenutku, ko je celotna funkcionalna dolžina vlečne vrvi že navita na bobnu in se vsakokraten vlečni element, pritrjen na omenjeno vlečno vrv, približa omenjenemu zgornjemu škripčniku.The invention is based on the problem of how to design a tractor-mounted, tractor-driven, forest-driven winch with a housing and a winding drum mounted on the latter, as well as with the above-mentioned winch-mounted upper pulley for guiding and directing the tow rope while unrolling it. said winding drum or winding it on said winding drum, which, without outwardly projecting parts, which in principle endanger the reliability of the entire winch and also the safety of the user in question, can be ensured that the winding drum ceases to operate immediately at the final stage of the tow rope winding, namely, at the moment when the entire functional length of the tow rope is already wound on the drum and the respective tow element attached to said tow rope approaches the said upper pulley.

Sklop za kontrolirano odvijanje vlečne vrvi z navijalnega bobna je opisan v SI 24540 A, na kar se prijavitelj tudi sklicuje z referenco. Gre za gozdarski vitel, ki je načeloma prirejen za priključitev na tritočkovni priključni mehanizem traktorja in obsega okrov ter v slednjem vgrajen s pomočjo kardanske gredi traktorja preko ustrezne sklopke in reduktorja gnan boben za navijanje oz. odvijanje vlečne vrvi. Na zunanji površini omenjenega okrova vitla je na voljo zgornji škripčnik, ki je zasukljiv okoli vertikalne geometrijske osi in obsega vrvenico. Vitel po izbiri obsega tudi pod zgornjim škripčnikom na primerni oddaljenosti od podlage razporejen spodnji škripčnik z vrvenico, tako da je omenjena vlečna vrv namestljiva vsaj preko vrvenice zgornjega škripčnika, po izbiri pa tudi preko vrvenice spodnjega škripčnika. Zgornji škripčnik vitla obsega okrov, v katerem je okoli svoje horizontalne geometrijske osi vrtljivo vgrajena vrvenica, razen tega pa je zgornji škripčnik opremljen z vodilno pušo, skozi katero poteka v notranjosti okrova zgornjega škripčnika preko omenjene vrvenice nameščena in v smeri proti navijalnemu bobnu potekajoča vlečna vrv. Tovrstna konfiguracija je med drugim opisana tudi v EP 2 855 337 Al. Namen zgornjega škripčnika, ki je načeloma opremljen z lastnim pogonskim sredstvom, običajno s hidravličnim pogonskim sredstvom, je po eni strani uporabniku olajšati odvijanja vrvi z navijalnega bobna, po drugi strani pa med navijanjem vlečne vrvi na navijalni boben vzdrževati napetost vlečne vrvi zaradi preprečevanja tvorbe zank, pregibov in podobnih fenomenov, ki negativno vplivajo bodisi na nosilnost vlečne vrvi ali zanesljivost delovanja gozdarskega vitla kot takega.The assembly for controlled unwinding of the tow rope from the winding drum is described in SI 24540 A, to which the applicant also refers. It is a forestry winch, which is, in principle, adapted for connection to the tractor's three-point linkage mechanism and the circumference of the housings and, in the latter, is mounted by means of a PTO shaft of the tractor via a suitable clutch and reducer driven drum for winding or. unwinding of the tow rope. On the outer surface of said winch housing there is an upper pulley which rotates about a vertical geometric axis and comprises a string. The winch optionally also comprises a lower pulley with a sling at a suitable distance from the upper pulley at a suitable distance from the base, such that said tow rope is adjustable at least over the pulley of the upper pulley and optionally also via the pulley of the lower pulley. The upper winch pulley comprises a housing in which a rope is rotatably mounted around its horizontal geometric axis, in addition the upper pulley is provided with a guide sleeve through which a drawbar extending inwardly into said housing of the upper pulley through said drawbar. . Such a configuration is described, inter alia, in EP 2 855 337 Al. The purpose of the upper pulley, which is generally provided with its own propulsion means, usually a hydraulic propellant, is to facilitate the user from unwinding the rope from the winding drum and, on the other hand, to maintain the tension of the tow rope while winding the tow rope on the winding drum. , kinks and similar phenomena that adversely affect either the load-carrying capacity of the tow rope or the reliability of the winch as such.

Po drugi strani je v SI 22855 A opisana naprava za kontrolirano navijanje in odvijanje žične vrvi-pletenice, pri kateri je vlečna vrv prav tako speljana skozi vodilno ustje zgornjega škripčnika in poteka proti navijalnemu bobnu. Vlečna vrv je opremljena z omejevalnikom, ki je razporejen v bližini vsakokratnega vlečnega elementa na prostem koncu vlečne vrvi. Škripčnik je opremljen s tipalom, ki je razporejen na zunanji strani okrova omenjenega škripčnika in je predviden za zaznavanje približevanja omenjenega omejevalnika, tako da se med navijanjem vlečne vrvi na navijalni boben v trenutku, ko se omejevalnik približa omenjenemu tipalu, prekine delovanje vsakokrat razpoložljivega pogonskega sredstva navijalnega bobna. Tovrstna naprava torej po eni strani predvideva vgradnjo omejevalnika na vsakokratno vlečno vrv, po drugi strani pa tudi vgradnjo tipala na ohišje škripčnika, kar v praksi pomeni prisotnost vsaj dveh navzven štrlečih delov, ki predstavljata nevarnost za vsakokratnega uporabnika in obenem tveganje v pogledu zanesljivosti delovanja gozdarskega vitla kot takega.On the other hand, SI 22855 A describes a device for controlled winding and unwinding of a wire rope-braid, in which the tow rope is also guided through the guide mouth of the upper pulley and extends toward the winding drum. The tow rope shall be fitted with a restraint arranged near each drawbar at the free end of the tow rope. The pulley is provided with a sensor arranged on the outside of the housing of said pulley and is intended to detect the approach of said limiter such that during the winding of the tow rope to the winding drum, as soon as the limiter approaches said sensor, the operation of the available drive means is interrupted. winding drum. Such a device therefore envisages on the one hand the installation of a limiter on each rope, and on the other, the installation of a sensor on the housing of the pulley, which in practice means the presence of at least two protruding parts that pose a risk to each user and at the same time a risk to the reliability of the forestry operation. winches as such.

Po izumu je predviden gozdarski vitel z izpopolnjenim krmiljenjem sklopa za kontrolirano navijanje vlečne vrvi na navijalni boben, pri čemer tovrsten vitel obsega vsaj en škripčnik za vodenje vlečne vrvi med navijanjem na navijalni boben omenjenega gozdarskega vitla kot tudi med odvijanjem z le-tega, in pri čemer omenjen škripčnik obsega okrov, v katerem je zasukljivo okoli svoje rotacijske osi vgrajena vrvenica, ki je gnana s pomočjo pogonskega sredstva, še zlasti hidromotorja. Omenjen okrov nadalje obsega vstopno ustje, skozi katero vlečna vrv v aksialni smeri okrova, namreč pravokotno glede na prej omenjeno rotacijsko os vrvenice, poteka proti slednji in naprej proti navijalnemu bobnu. Omenjena vlečna vrv je opremljena z vsaj enim vlečnim sredstvom, ki predstavlja odebelitev vlečne vrvi v smislu lokalnega povečanja njenega premera. Tovrsten gozdarski vitel nadalje obsega vsaj eno tipalo za zaznavanje približevanja omenjenega vlečnega sredstva ali podobne odebelitve na vlečni vrvi okrovu omenjenega škripčnika.According to the invention, a forestry winch is provided with advanced control of the assembly for controlled winding of the tow rope to the winding drum, wherein such a winch comprises at least one pulley for guiding the tow rope during winding on the winding drum of said forest winch and during its unwinding. wherein said pulley comprises a housing in which a twist is rotated about its rotary axis, which is driven by a propellant, in particular a hydraulic motor. Said housing further comprises an inlet mouth through which a pulling rope in the axial direction of the housing, namely perpendicular to the aforementioned rotational axis of the rope, extends toward the latter and further towards the winding drum. Said tow rope is provided with at least one towing means which represents the thickening of the tow rope in terms of a local increase in its diameter. Such a forest winch further comprises at least one sensor for detecting the approach of said traction means or similar thickening on the traction rope to the frame of said pulley.

Po izumu je predvideno, daje v območju omenjenega vstopnega ustja v okrovu v okrovu s pogonskim sredstvom opremljenega in za navijanje vlečne vrvi na navijalni boben gozdarskega vitla predvidenega škripčnika vgrajena v smeri poteka vlečne vrvi, namreč v aksialni smeri okrova škripčnika, sem ter tja premakljiva, proti izstopu iz omenjenega okrova zavarovana in vzmetno podprta vodilna puša, katere notranji premer je manjši od zunanjega premera omenjenega vlečnega sredstva ali podobne odebelitve na vlečni vrvi in ki je prirejena za sodelovanje s tipalom, ki je vgrajeno v notranjosti okrova škripčnika in prirejeno za sodelovanje z vsakokrat razpoložljivo krmilno enoto vsakokratnega pogonskega sredstva navijalnega bobna za navijanje omenjene vlečne vrvi gozdarskega vitla v smislu prekinitve pogona omenjenega navijalnega bobna v trenutku, ko se omenjeno vlečno sredstvo ali podobna odebelitev na vlečni vrvi približa omenjenemu okrovu škripčnika.According to the invention, it is envisaged that, in the area of said inlet mouth, a housing in the housing with a propellant equipped and for winding the tow rope on the winding winch of the intended winch is mounted in the direction of the draw rope, namely in the axial direction of the pulley housing, and is movable there, secured and spring-supported guide sleeve against the exit of said housing, the inside diameter of which is smaller than the outer diameter of said towing means or similar thickening on the tow rope, and adapted to cooperate with a sensor mounted inside the pulley housing and adapted to cooperate with a control unit for each winding drum drive means for winding said forestry winch rope in the sense of interrupting the operation of said winding drum at the moment when said tow means or similar thickening on the tow rope approaches said stern housing.

Pri prednostni izvedbi izuma je na obodu omenjene vodilne puše nameščena vzmet, s pomočjo katere je vodilna puša premakljiva v smeri proti omenjenemu vlečnemu sredstvu ali podobni odebelitvi na vlečni vrvi. V takem primeru je še zlasti prednostno, če omenjena vodilna puša na svoji izven okrova škripčnika in vstran od vrvenice obrnjeni strani obsega odebelitev, omenjena vzmet pa je zasnovana kot tlačna vzmet, ki je razporejena med omenjeno odebelitvijo in okrovom škripčnika, pri čemer daje omenjena odebelitev prirejena za sodelovanje s tipalom.In a preferred embodiment of the invention, a spring is mounted on the circumference of said guide sleeve by which the guide sleeve is movable in the direction of said draw means or similar thickening on the draw rope. In such a case, it is particularly advantageous if said guide sleeve comprises a thickening on its outside the shell and away from the cord, and said spring is designed as a pressure spring distributed between said thickening and the shell, giving said thickening adapted to work with the sensor.

Izum bo v nadaljevanju podrobneje obrazložen s primerom izvedbe, ki je shematično ponazorjen na priloženi skici, kjer kažetaThe invention will now be explained in more detail by way of an exemplary embodiment which is schematically illustrated in the accompanying drawing showing

Sl. 1 gozdarski vitel z izpopolnjenim krmiljenjem sklopa za kontrolirano navijanje vlečne vrvi na navijalni boben v diametralnem prerezu skozi zadevni škripčnik in v stanju izvlečene vlečne vrvi pred približanjem vlečnega elementa oz. odebelitve okrovu omenjenega škripčnika;FIG. 1 forestry winch with advanced control of the assembly for controlled winding of the tow rope to the winding drum in diametrical cross section through the respective pulley and in the state of the pulled rope before approaching the towing element or. the thickening of the frame of said pulley;

Sl. 2 pa gozdarski vitel po Sl. 1, spet v diametralnem prerezu skozi zadevni škripčnik, vendar in v stanju, ko se vlečni element oz. odebelitev vlečne vrvi nahaja neposredno ob okrovu omenjenega škripčnika.FIG. 2 is a forest winch according to FIG. 1, again in diametrical cross-section through the respective pulley, but also in the state when the element or. the thickening of the tow rope is located directly adjacent to the casing of said pulley.

Gozdarski vitel z izpopolnjenim krmiljenjem sklopa za kontrolirano navijanje vlečne vrvi 1 na navijalni boben je, kije prikazan na Sl. 1 in 2, obsega škripčnik 2 za vodenje vlečne vrvi 1 med navijanjem na navijalni boben gozdarskega vitla kot tudi med odvijanjem z le-tega.The forest winch with advanced control of the assembly for controlled winding of tow rope 1 onto the winding drum is shown in FIG. 1 and 2, comprises a pulley 2 for guiding the tow rope 1 during winding on the winding drum of the forestry winch as well as during its unwinding.

Omenjen škripčnik 2 obsega okrov 20, v katerem je zasukljivo okoli svoje rotacijske osi Y vgrajena vrvenica 22, kije gnana s pomočjo pogonskega sredstva 23, še zlasti hidromotorja. Omenjen okrov 20 nadalje obsega vstopno ustje 21, skozi katero vlečna vrv 1 v aksialni smeri X okrova 20, namreč pravokotno glede na prej omenjeno rotacijsko os Y vrvenice 22, poteka proti slednji in naprej proti na skici sicer neprikazanemu navijalnemu bobnu gozdarskega vitla.Said pulley 2 comprises a housing 20 in which a twist 22 is rotated about its rotary axis Y, which is driven by a drive means 23, in particular a hydraulic motor. Said housing 20 further comprises an inlet mouth 21 through which the rope 1 in the axial direction X of the housing 20, at right angles to the aforementioned rotary axis Y of the rope 22, extends toward the latter and forward to the skidding drum of the forestry winch not shown in the drawing.

Omenjena vlečna vrv 1 je opremljena z vsaj enim vlečnim sredstvom 3, ki predstavlja odebelitev vlečne vrvi 1 v smislu lokalnega povečanja njenega premera d. Omenjeno vlečno sredstvo 3 načeloma lahko predstavlja kavelj, vrtelj ali podobna odebelitev.Said tow rope 1 is provided with at least one towing means 3 which represents the thickening of tow rope 1 in terms of a local increase in its diameter d. Said traction means 3 may in principle be a hook, a pivot or similar thickening.

Gozdarski vitel nadalje obsega tipalo 4 za zaznavanje približevanja omenjenega vlečnega sredstva 3 ali podobne odebelitve na vlečni vrvi 1 okrovu 20 škripčnikaThe forest winch further comprises a sensor 4 for detecting the approach of said traction means 3 or similar thickening on the traction rope 1 to the hopper 20

2.2.

V območju omenjenega vstopnega ustja 21 v okrovu 20 škripčnika 2 je vgrajena v smeri poteka vlečne vrvi 1, namreč v aksialni smeri X okrova 20 škripčnika 2, sem ter tja premakljiva, proti izstopu iz omenjenega okrova 20 zavarovana in vzmetno podprta vodilna puša 5, katere notranji premer d je manjši od zunanjega premera D omenjenega vlečnega sredstva 3 ali podobne odebelitve na vlečni vrvi 1.In the area of said inlet mouth 21 in the housing 20 of the housing 2, it is mounted in the direction of the draw rope 1, namely in the axial direction X of the housing 20 of the housing 2, which is also movable there, secured and spring-supported guide bushing 5, out of which the inner diameter d is smaller than the outer diameter D of said traction means 3 or similar thickening on tow rope 1.

Omenjena vodilna puša 5 je prirejena za sodelovanje s tipalom 4, ki je vgrajeno v notranjosti okrova 20 škripčnika 2 in prirejeno za sodelovanje z vsakokrat razpoložljivo krmilno enoto 6 vsakokratnega pogonskega sredstva navijalnega bobna za navijanje omenjene vlečne vrvi 1 gozdarskega vitla v smislu prekinitve pogona omenjenega navijalnega bobna v trenutku, ko se omenjeno vlečno sredstvo 3 ali podobna odebelitev na vlečni vrvi 1 približa omenjenemu okrovu 20 škripčnika 2.Said guide sleeve 5 is adapted to cooperate with a sensor 4, which is mounted inside the housing 20 of the pulley 2 and adapted to cooperate with the control unit 6 of the winding drum in each case used to wind said forestry winch rope 1 in terms of interrupting the operation of said winding. the drum at the moment when said towing means 3 or similar thickening on the tow rope 1 approaches said hoop housing 20.

V prikazanem primeru je na obodu omenjene vodilne puše 5 nameščena vzmet 7, s pomočjo katere je vodilna puša 5 premakljiva v smeri proti omenjenemu vlečnemu sredstvu 3 ali podobni odebelitvi na vlečni vrvi 1. Omenjena vodilna puša 5 na svoji izven okrova 20 škripčnika 2 in vstran od vrvenice 22 obrnjeni strani obsega odebelitev 50, tako da je omenjena vzmet 7, ki je v tem primeru zasnovana kot tlačna vzmet, razporejena med omenjeno odebelitvijo 50 in okrovom 20 škripčnika 2, pri čemer je omenjena odebelitev 50 obenem tudi prirejena za sodelovanje s tipalom 4.In the example shown, a spring 7 is mounted on the circumference of said guide sleeve 5, by means of which the guide sleeve 5 is moved in the direction of said draw means 3 or a similar thickening on draw rope 1. Said guide sleeve 5 is mounted on its outside of the box 20 and 2 sideways. from the turn 22, the facing side comprises a thickening 50 such that said spring 7, which in this case is designed as a pressure spring, is arranged between said thickening 50 and the pulley housing 20, wherein said thickening 50 is also adapted to cooperate with the sensor 4.

Škripčnik 2 je v osnovi namenjen za olajšanje odvijanja vlečne vrvi 1 z navijalnega bobna gozdarskega vitla in je v ta namen opremljen s pogonskim sredstvom 23. Navijalni boben ima namreč zaradi lastne teže in tudi mase nanj navite vlečne vrvi 1 precejšnjo vztrajnost, kar bi sicer od uporabnika gozdarskega vitla med odvijanjem vlečne vrvi 1 terjalo znaten napor. Po drugi strani škripčnik 2 svojo funkcijo vrši tudi med navijanjem vlečne vrvi 1 na omenjen navijalni boben, in sicer s tem, da vzdržuje vlečno vrv 1 v napetem stanju ter s tem preprečuje formiranje zank, pregibov in podobnih anomalij, ki bi lahko negativno vplivale bodisi na nosilnost vlečne vrvi 1 ali tudi na funkcionalnost gozdarskega vitla kot takega.The pulley 2 is basically intended to facilitate unwinding of tow rope 1 from the windlass of the forestry winch and is equipped with a drive means 23. Namely, the winding drum has a considerable inertia due to its own weight and also the weight of the tow rope 1 wound therewith, which would otherwise the winch wearer took considerable effort during unwinding of rope 1. On the other hand, the pulley 2 also performs its function during winding of the tow rope 1 on said winding drum, by keeping the tow rope 1 in tension and thus preventing the formation of loops, kinks and similar anomalies that could adversely affect either to the carrying capacity of tow rope 1 or also to the functionality of the winch as such.

Med odvijanjem in tudi v začetku navijanja na njenem prostem koncu z vlečnim elementom 3 ali podobno odebelitvijo opremljene vlečne vrvi 1 se, zahvaljujoč omenjeni vzmeti 7, vodilna puša 5 nahaja v položaju po Sl. 1, torej karseda izven okrova 20 škripčnika 2 in na odmiku od tipala 4. Ko pa ob koncu navijanja skozi vstopno ustje 21 škripčnika 2 potekajoče vlečne vrvi 1 na navijalni boben omenjen vlečni element 3 ali podobna odebelitev z zunanjim premerom D, ki je večji od notranjega premera d omenjene puše 5, zadene ob omenjeno pušo 5. se slednja premakne v aksialni smeri X in približa tipalu 4, kar preko upravljalne enote 6 za krmiljenje pogonskega sredstva navijalnega bobna prekine rotacijo slednjega.During unwinding and also at the beginning of the winding at its free end with the traction element 3 or similar thickening of the equipped tow rope 1, thanks to said spring 7, the guide sleeve 5 is in the position of FIG. 1, ie as far out of the housing 20 of the pulley 2 and at a distance from the sensor 4. When, at the end of the winding through the inlet mouth 21 of the pulley 2 of the traction cable 1, a traction element 3 or a similar thickening with an outer diameter D greater than greater than D is mentioned. of the inner diameter d of said sleeve 5 hit by said sleeve 5. the latter moves in the axial direction X and approaches the sensor 4, which interrupts the rotation of the latter via the control unit 6 for controlling the winding drum drive means.

Zahvaljujoč opisanemu pristopu je torej brez navzven štrlečih delov, ki bi načeloma lahko ogrožali zanesljivost delovanja celotnega gozdarskega vitla in tudi varnost vsakokratnega uporabnika, možno zagotoviti takojšnjo prekinitev delovanja navijalnega bobna v zaključni fazi navijanja vlečne vrvi 1, namreč v trenutku, ko je celotna funkcionalna dolžina vlečne vrvi že navita na bobnu in se vsakokraten vlečni element 3, pritrjen na omenjeno vlečno vrv 1, približa omenjenemu zgornjemu škripčniku 2.Thanks to the described approach, therefore, without outwardly projecting parts, which in principle could jeopardize the reliability of the entire forestry winch and also the safety of each user, it is possible to ensure an immediate interruption of the winding drum in the final stage of winding of the tow rope 1, at the moment when the total functional length is the tow ropes are already wound on the drum and the respective tow element 3 attached to said tow rope 1 is brought closer to said upper pulley 2.

Claims

PATENT APPLICATIONS

1. A forest winch with advanced control of a controlled rope winding assembly assembly (1) on a winding drum, comprising at least one pulley (2) for guiding the tow rope (1) during winding on the winding reel of the forestry winch, wherein said pulley (2) comprises a housing (20) in which a twist (22) which is driven by a propulsion means (23), in particular a hydromotor, said housing (20) is rotatably rotated about its rotary axis (Y). and further comprising an inlet mouth (21) through which the pulling rope (1) in the axial direction (X) of the housing (20), orthogonal to the aforementioned rotary axis (Y) of the rope (22), extends towards the latter and further to the winding and wherein the tow rope (1) is provided with at least one towing device (3) that represents the thickening of the tow rope (1) in terms of locally increasing its diameter (d), except that said forest winch comprises at least one sensor ( 4) mentioned for sensing approximation ega traction means (3) or similar thickening on the traction rope (1) of the pulley (20) housing (2), characterized in that, in the area of the inlet mouth (21), the housing (20) is provided with and for winding the tow rope (1) onto the winding drum of the forestry winch of the intended pulley (2) mounted in the direction of the draw rope (1), namely in the axial direction (X) of the pulley (20) of the pulley (2), moveable here and there, towards the exit the guide sleeve (5) secured and supported from said housing (20) whose inner diameter (d) is smaller than the outer diameter (D) of said towing means (3) or similar thickening on the tow rope (1) and adapted for engagement with a sensor (4) mounted inside the housing (20) of the pulley (2) and adapted to cooperate with the control unit (6) available at each time of the winding drum drive means for winding said forestry winch draw rope (1) of said winding a the drum at the instant when said towing means (3) or similar thickening on the tow rope (1) approaches said housing (20) of the pulley (2).

Apparatus according to claim 1, characterized in that a spring (7) is mounted on the circumference of said guide sleeve (5) by which the guide sleeve (5) is movable in the direction of said draw means (3) or similar thickening on the drawbar ropes (1).

Apparatus according to claim 1 or 2, characterized in that the guide sleeve (5) on its outside of the housing (20) of the pulley (2) and away from the rope (22) on the facing side comprises a thickening (50), said spring (7) however, it is designed as a pressure spring disposed between said thickening (50) and the housing (20) of the pulley (2), and that said thickening (50) is adapted to cooperate with the sensor (4).