DEVICE FOR PICKING UP COVERING FABRICS FROM PLANTATION FIELDS

Abstract: A device for picking up covering fabrics from plantation fields comprises a frontally mounted capturing device (9), through which a spread-out fabric (8) may be pulled in while forming a narrow strand. A rotatable shaft (11) is axially placed on the vehicle in order to be able to receive a reel (10). Between the capturing device (9) and the reel (10), there are means (14, 14', 14'') for guiding the strand of fabric in a gathered state to the reel (10). In the proximity of the reel, there is also a mechanism (12) for evenly distributing the strand of fabric onto the reel.

Description: DEVICE FOR PICKING UP COVERING FABRICS FROM PLANTATION FIELDS Technical Field of the Invention This invention relates to a device intended for pick- ing up covering fabrics from plantation fields, comprising a shaft mountable on a wheel-borne vehicle, which shaft is rotatable with the purpose of guaranteeing winding the fabric into a roll. Prior Art Recently, it has become usual to cover outdoor cultivations with fabrics with the purpose of ensuring a good heat generation in the immediate proximity to the crops, as well as protecting the crops against insect or bug attacks. The impro- ved heat generation yields early and safe harvests and by the fact that insects are kept away from the crops, the use of chemical insect control means may be made unnecessary. For the last-mentioned reason, the covering fabrics are used with a particular advantage in ecological cultivations. The fabrics may consist of a fibrous fabric or a perforated plastic film, which in both cases is delivered in long lengths having a large width. In practice, these fabrics usually have a width within the range of 10-13 metres and a length of 150-250 metres or more. At delivery, the fabrics are folded and wound into rolls the width of which may attain approx. 2 metres. To put out such fabrics on the plantation field is comparatively simple, but problems arise when the fabrics are to be taken in from the field towards the end of the cultivation season so as to be reused during a following cultivation season. Most often, the handling is done manually, more precisely by several men successively pulling out smaller portions of the fabric, after loosening existing anchorages, to one edge of the plantation field and there fold and pack said fabric together step by step along the entire length thereof. This procedure is not only laborious and time-consuming but also associated with high risks of sensitive crop being damaged. With the purpose of removing the need for the difficult manual handling of fabrics, simpler machine equipments have been developed for partly mechanized picking up the fabrics. More precisely, these equip- ments consist of rotatable shafts which are drivable by means of, for instance, the ordinary hydraulic system of a tractor and which are included in a stand mountable on the rear of the tractor. However, such shafts merely permit a partial facilita- tion of the work inasmuch as the fabric may be wound to itself and be transported away from the field only when it still has been folded together manually to a limited width (approx. 2 metres) which corresponds to the length of the shaf . In other words, this mechanized method still requires manual folding of the fabric before winding it onto the shaft. Objects and Features of the Invention The present invention aims at obviating the abovementioned problems and at creating a device for picking up fab- rics which radically decreases the need for manually work in conjunction with the removal of covering fabrics from plantation fields, as well as reduces the risks for damages to the crops as well as the fabrics to a minimum. Thus, a primary object of the invention is to provide a device for picking up fabrics which permits that the fabric in the existing, spread out state is taken up directly from the field and taken care of in an immediately storable form without having to be handled by many people. A further object of the invention is to create a picking up device permitting a simple, fast and effective pick- ing up work by one single man, viz . a driver of a tractor or a similar vehicle. In doing so, the driver should be able to deliver the fabric modified to a storable shape without having to leave the vehicle. It is also an object of the invention to create a picking up device permitting picking up covering fab- rics independent of the current weather, in particular with regard to wind-force and precipitation conditions. According to the invention, at least the primary object is attained by the features defined in the characterizing clause of claim 1. Preferred embodiments of the device for picking up fabrics according to the invention are furthermore defined in the dependent claims. Brief Description of the Appended Drawings In the drawings : Fig 1 is a perspective view of a device according to the invention mounted on a tractor during work, Fig 2 is a planar view from above of the tractor working in a plantation field together with the device, Fig 3 is an enlarged planar view from above showing the device more in detail, Fig 4 is a section A-A in fig 3, although without the wound fabric, and Fig 5 is a partial view from above showing a dog for rotation of a reel for picking up fabrics. Detailed Description of a Preferred Embodiment of the Invention In the drawings (see initially fig 1 and 2), 1 generally designates a vehicle in the form of a tractor which, in a conventional way, may include a frontal wheel pair relatively small wheels 2, as well as a rear wheel pair having considerably larger wheels 3. Advantageously, these wheels are pos- sible to reset so that they may be adjusted to various distances between the plant rows. In other words, the wheels of the tractor should be able to be brought forward in furrows 4 between adjacent plant rows 5. In the drawings, 6 designates a frontal end of the tractor, while a rear end is generally designated 7. A covering fabric for protecting the crops growing on the plantation field is in turn generally designated 8. For the continued description reference is now also made to figures 3 to 5. A picking up device made according to the invention is mounted on tractor 1, the main components of which device consist of a capturing device 9, a reel 10 which is mountable on a rotatable shaft 11, and means for guiding a part of the fabric shaped to a strand by the capturing device 9 from the capturing device to the reel 10. Furthermore, a mechanism 12, which has the purpose of evenly distributing the held together fabric strand on the reel 10, is included in the device . In the example shown the capturing device 9 consists of an endless frame or ring which is applied on an registration arm in the shape of a bar 13 which projects from one side of the tractor. More precisely, the frame 9 is placed in front of the front wheels of the tractor, with the frame situated comparatively highly above the ground (e.g. within the range of 1- 2 metres) . This placing guarantees that the fabric 8 may be removed from the crops in a careful way by being lifted up in a comparatively steep angle against the ground- level as well as that the strand-shaped, gathered part of the fabric which follows after the capturing device does not get stuck in the wheels of the tractor even if hard wind would occur. The gathered strand of fabrics is led from the capturing device 9 via a number of pipe pieces 14, 14', 14" of which the two first-mentioned ones have the shape of straight pipes with a considerable length extension. The last -mentioned pipe piece consists of a pipe bend by means of which the strand of fabric may be unlinked from the motion path parallel to the length extension of the vehicle to a transverse motion path in direction towards the reel 10. In the present example, the reel 10 is mounted at the rear of the tractor. In doing so, the guiding pipes 14, 14', 14" are mounted on a framework 15, which extends along one side of the tractor, and they are carried by a laterally projecting carrier 16. The shaft 11 is carried by a fastener 17 (see fig 3) , which is turnably moveable relatively the framing of the tractor. More precisely, the fastener 17 may be turned in the ver- tical plane by means of the three-point lift 18 of the tractor. By means of this three-point lift, the shaft 11 may thus be tilted between various oblique positions, more precisely between an upper end position in which the shaft points obliquely outwards/upwards relatively the horizontal plane and a lower end position in which it points obliquely downwards, backwards relative to the horizontal plane. The shaft 11 is rotatably mounted in a bearing device 19 (see fig 5) applied on the fastener 17, and drivable by means of a hydraulic motor 20 connected to the ordinary power outlet of the tractor. Between the motor and the bearing device a sliding clutch 21 may be arranged. On the shaft, there is a dog in the shape of a disk 22 having one or more fingers 23. The reel 10 includes, in addition to a central pipe 24 for application onto the shaft 11, two opposite end por- tions, each one of which consists of an external ring 25 and a plurality of spokes 26 which extend radially between the ring and the pipe. The reel constructed in this way is in practice easy to handle, inasmuch as the application as well as the removal can be carried out by means of levers inside the driving compartment. Thus, the shaft 11 may be tilted to a substantially horizontally or obliquely downwards/backwards leaning position in which it may be inserted into the pipe 24 of a reel laying on the ground. When the shaft is thereafter tilted up to an obliquely upwards/backwards leaning position, the reel pipe automatically slides forwards so that the fingers 23 on the dog 22 will stick into the spaces between adjacent spokes. This means that the dog automatically connects the motor's drift to the reel so that this is brought to rotate when the shaft is rotated by means of the motor. When the reel has been filled with fabrics the reel may be removed from the shaft merely the simple measure of tilting the shaft to an obliquely backwards/downwards leaning position in which the reel automatically slides off the shaft. The distribution mechanism 12 has in the shown example the shape of an arm which at a first end is articulatedly connected to the frame 15 in order to be pivotable backwards and forwards, and which at the opposite end thereof has a loop 27 through which the strand of fabrics may pass. Instead of a loop, other means may also be used, e.g. an upwardly open U- bolt . Pivoting of the arm 12 is guaranteed by means of a hydraulic cylinder 28, which by being shortened and lengthened in a steady pace, brings the arm to sway backwards and forwards along the length extension of the reel in a corresponding pace. Function and Advantages of the Invention When a covering fabric, spread-out on a plantation field, is to be removed, the preparatory measure is taken that the existing anchorages are at least partly removed from the long side edges of the fabric. In addition, a 5-10 metres long cord may advantageously be fastened at one end of the fabric. This cord may in a simple way be pulled through the capturing device 9, the various pipe pieces 14, 14', 14", the loop 27 on the pivoting arm 12, and wound some rounds around the central pipe 24 of a reel applied on the shaft 11. The application of the reel onto the shaft is carried out in the simple way previous described, i.e. by initially tilting the shaft to a lower position in which it may be inserted into the central pipe, and thereafter tilting the same somewhat in the direction upwards, the reel automatically sliding to an inner end position in which the dog is automatically engaged with the spokes of the inner end portion. Picking up the fabric is initiated by setting the reel in rotation simultaneously as the tractor is driven in the forward direction, more precisely with the wheels of the tractor positioned in the furrows between adjacent plant rows. When the cord attached to one end of the fabric hasa in its entity passed the capturing device 9, the fabric too is pulled through the device, whereby the 10-13 metres wide fabric is gathered and shaped to a comparatively narrow strand. This strand then passes through the guiding pipe pieces as well as the loop of the distribution arm, and then the same is wound to the reel while forming a roll. By the fact that the guiding pipe pieces are of a considerable length, it is guaranteed that the strand of the fabric is smoothly guided through the same without fluttering and getting itself entangled therein. In addition, the distribution arm guarantees that the arriving strand of fabric is evenly distributed in the roll which is built up on the reel. A substantial advantage of the device according to the invention is that the fabric is taken up from the spread- out state thereof on the plantation field without initially having to be folded. By the fact that the capturing device is placed relatively high above the ground- level and in front of the front wheels of the tractor, it is furthermore guaranteed that the fabric will be removed from the ground- level in a comparatively large or steep angle. This means that the risk for damage on the crops is minimized. Simultaneously, the steep angle guarantees that the fabric will not be damaged as well as be kept clean by the fact that soil and stones may roll along the fabric all the way to the free end, which is finally captured and wound onto the reel. Furthermore, it is avoided that the still spread-out part of the fabric does not get caught in the tractor wheels in conjunction with possible flutter motions as a consequence of wind. Another substantial advantage is that the roll of fabric wound onto the reel may be handled in a simple and ti esaving way. Thus, the reel together with the fabric may in a simple way be encircled by a plastic bag or the like in order to protect the fabric against UV- light. Such a protective bag may be smoothly wrapped around the reel while it is still applied to the shaft 11, and then the reel may be transported by means of the tractor to a suitable storage yard. When a new cultivation season is to be initiated, the used fabric wound to the reel may be laid out on the plantation field again in a smooth and timesaving way. Thus, the fabric may be pulled out from the reel in a strand shape through the loop 27 of the distribution arm 12, while this is kept inactive, and then the fabric is spread out over the field by two men following the tractor and separating the long side edges of the fabric as the tractor moves forwards along the plantation field. Feasible Modifications of the Invention The invention is not solely restricted to the embodiment described and shown in the drawings. Thus, it is feasible to mount the shaft of the reel at the front of the tractor instead of at the rear. However, also in this case the shaft is mounted axially in order to permit the simple and smooth attachment and detachment, respectively, of the reel. In case the shaft together with the reel is front-mounted, the number of guiding pipe pieces may be reduced, for instance to only one pipe bend. Also other modifications of the invention are possible within the scope of the attached claim 1.

Claims: Claims 1. Device for picking up covering fabrics from plantation fields, comprising a shaft which is mountable on a wheel-borne vehicle, and rotatable with the purpose of winding the fabric into a roll, c h a r a c t e r i z e d in that the same comprises a capturing device (9) , which is arranged on a registration arm (13) placeable at the front of the vehicle (1), and through which a fabric (8) spread-out on a field may be pulled in while forming a narrow strand, that the rotatable shaft (11) is axially placed on the vehicle (1) in order to be able to receive as well as liberate a separate reel (10) intended for winding the strand-shaped fabric by driving the vehicle in the direction backwards or forwards, and that there are means (14, 14', 14") between the capturing device (9) and the shaft (11) for guiding the strand of the fabric in a gathered state from the capturing device to the reel (10), a mechanism (12) being arranged in proximity of the shaft (11) to evenly distribute the arriving strand of fabric onto the reel . 2. Device according to claim 1, c h a r a c t e r i z e d in that the capturing device consists of an endless frame or ring (9) . 3. Device according to claims 1 or 2 , c h a r a c t e r i z e d in that the capturing device (9) is placed in front of a frontal pair of wheels (2) of the vehicle (1) . 4. Device according to anyone of the preceding claims, c h a- r a c t e r i z e d in that the reel (10) , in addition to a central pipe (24) for application onto the shaft (11), comprises two opposite end portions, each one of which consisting of an external ring (25) and a plurality of spokes (26) , and that the shaft (11) is vertically tiltable and comprises a dog (22) having one or several fingers (23), which may automatically engage between adjacent spokes when an end portion of the reel approaches an inner end position in proximity of the dog by the fact that the shaft is tilted to a position pointing obliquely outwards/upwards. 5. Device according to anyone of the preceding claims, c h a- r a c t e r i z e d in that said guiding means consists of pipe pieces (14, 14', 14") having a marked length extension. 6. Device according to claim 5, c h a r a c t e r i z e d in that at least one pipe piece consists of a pipe bend (14") to guide the strand of fabric from a motion path downstream the capturing device, substantially parallel to the direction of the vehicle (9), to a motion path extending transverse to said direction up-stream the reel. 7. Device according to anyone of the preceding claims, c h a- r a c t e r i z e d in that the shaft (11) and the reel (10) are placed at the rear of the vehicle (1) , all fabric guiding means (14, 14', 14") together with the distribution mechanism (12) being mounted on a framework (15) placed along one side of the vehicle, said framework being arranged on a carrier (16) projecting laterally from the vehicle. 8. Device according to claim 7, c h a r a c t e r i z e d in that the distribution mechanism comprises an arm (12), which at a first end is articulatedly connected to the frame (15) in order to be pivotable backwards and forwards, e.g. by means of a hydraulic cylinder (28) , and at a second end has means (27) for guiding the strand of fabric.

Inventors: MOBERG JAN, MOBERG, JAN
Applicants: FROESOE TRAEDGAARD AB, MOBERG JAN, MOBERG, JAN
Application year: 1998
Main classification: A01G13
IPC codes: A01G13