JP4467006B2 - Film break detection mechanism - Google Patents

Description

  The present invention relates to a film breakage detection mechanism applied to a multifilm coating apparatus that covers soil with a multifilm drawn from a multifilm roll.

  Conventionally, in a multi-film coating apparatus that coats soil with a multi-film drawn from a multi-film roll, the presence or absence of multi-film is detected by a film break detection mechanism, and an alarm device (for example, an alarm buzzer) is based on the detection result. Is operated to notify the operator whether or not the multi-film has been lost during the multi-film coating operation.

As a film break detection mechanism applied to this multi-film coating apparatus, for example, when the operating piece provided in the detection switch is in contact with the upper surface of the multi-film, the detection switch is opened by the pressing force, There has been proposed one that is closed when the contact of the multi-film with the working piece is eliminated (see Patent Document 1).
Japanese Utility Model Publication No. 60-24128

  However, the film break detection mechanism as described above has the following problems. That is, (i) when the multi-film is loosened at the start of multi-film covering work for each kite, when traveling is stopped in the middle of the work, or when the work machine meanders during the work, Although the contact of the detection switch with the operating piece is released, the detection switch may erroneously detect that the multifilm does not exist even though the multifilm exists. (ii) In addition, the contact between the multi-film and the operating piece of the detection switch is released due to wind, vibration of the work machine, etc., and the detection is performed despite the presence of the multi-film as described above. The switch may falsely detect that no multi-film is present. In any case, when the alarm device is activated by the detection switch, the worker must interrupt the work each time to check the presence or absence of the multi-film, and the work efficiency of the multi-film coating work is likely to be lowered.

  The present invention has been made in view of the prior art, and it is an object of the present invention to provide a film breakage detection mechanism that can reliably detect the presence or absence of a multi-film and thus improve the workability of a multi-film coating operation. To do.

In order to solve the above-mentioned problems, the present invention places the soil gathered together by the earthing wheel on the skirt while pressing the skirt of the multi-film drawn from the multi-film roll against the soil by the film retaining ring. the multi-film a film breakage detection mechanism applied to a multi-film coating apparatus that is configured to cover the soil with the multi-film roll to apply tension to the multi-film drawn from the multi-film roll a tension roll interposed moving path of the multi-film leading to the film suppressed wheel from a sensor member, the tension roll, a support shaft, so as to contact with the multi-film which moves the moving path It is supported by the support shaft via the biasing member and the holding shafts And, the biasing force of the pressing shaft the biasing member by the tension of the multi-film on the multi-film in a state that giving tension by abutting the multi-film that the pressing axis is moved said movement path anti was disposed decentered eccentric position relative to the support shaft, and concentric position on concentric with the support shaft the pressing axis by the urging force of the urging member in the film breakage state of the multi-film disposed, the sensor member, the pressing axis to provide a film breakage detection mechanism, wherein the benzalkonium detect whether the position in any of the concentric position or eccentric position.

  In the film break detection mechanism according to the present invention, when the multifilm coating operation is performed in the applied multifilm coating apparatus, the multifilm drawn from the multifilm roll is placed on the support shaft on the biasing member. It travels on the moving path while being in contact with the pressing shaft supported via the belt, and is separated from the pressing shaft when the multi-film disappears. At this time, the pressing shaft is arranged at a concentric position concentrically with the support shaft by the biasing member in a state where the multi-film does not exist, and in the state where the multi-film exists. It is arranged at an eccentric position that is eccentric with respect to the support shaft by tension. In the sensor member, it is detected whether the pressing shaft is located in a concentric position or an eccentric position. Then, in the multi-film coating apparatus, an alarm device (for example, an alarm buzzer) is activated based on the detection result by the sensor member, and the operator is notified whether or not the multi-film is lost during the multi-film coating operation. The

  Thus, according to the film break detection mechanism according to the present invention, the pressing shaft that is in contact with the multi-film is supported by the support shaft via the biasing member, and the multi-film does not exist. The presence or absence of the multi-film is detected by detecting the position of the press-down shaft in the sensor and the position of the press-down shaft in the state where the multi-film is present by the sensor member. Since the presence or absence of the multi-film is detected in a state where the urging force of the urging member is working, when the multi-film covering work is started, when traveling is stopped during the work, or when the work machine meanders during the work, Alternatively, the sensor member can be reliably operated even when wind or vibration of the work machine occurs, thereby reliably detecting the presence or absence of the multi-film. It can be. Moreover, in the said multi-film coating | coated apparatus, since the said alarm device is operated by the said sensor member, a highly reliable alarm can be performed with respect to an operator, and the workability | operativity of multi-film coating | working work is improved so much. Can do.

  Examples of the support shaft and the holding shaft include the following modes. That is, when (a) the support shaft is rotatable about an axis and the pressing shaft is configured to rotate about the axis integrally with the support shaft, (b) the support shaft and the This is a case where the pressing shaft is not rotatable around the axis. In the case of (a), the pressing shaft can be driven and rotated integrally with the support shaft in accordance with the movement of the multi-film abutted against the pressing shaft. In this case, the support shaft and the pressing shaft may be connected so as not to rotate relative to each other by the biasing member, and the pressing shaft is respectively connected to the support shaft and the pressing shaft with respect to the support shaft. It may be connected so as to be movable in the radial direction and relatively unrotatable around the axis via the urging member engaged by the concave-convex engagement by the formed concave portion or convex portion such as a pin. In the case of (b), the multi-film is slid on the pressing shaft when contacting the pressing shaft.

  In the film break detection mechanism according to the present invention, the pressing shaft may be supported by extrapolation on the support shaft, or the pressing shaft may be inserted and supported by the support shaft. When the pressing shaft is supported by extrapolation to the support shaft, the pressing shaft is a hollow shaft that is extrapolated to the support shaft, and the urging member is formed between the outer peripheral surface of the support shaft and the pressing shaft. The case where it is arrange | positioned between inner peripheral surfaces can be illustrated. Further, when the pressing shaft is inserted and supported by the support shaft, the support shaft is a pair of hollow support shafts spaced apart in the axial direction, and both ends of the pressing shaft are the pair of hollow support shafts. It can be illustrated that the urging member is disposed between the pair of hollow support shafts and both end portions of the pressing shaft.

  In the film break detection mechanism according to the present invention, it is preferable that the urging member is a plurality of springs arranged at equal intervals in the circumferential direction with reference to the axis of the support shaft. By doing so, the urging member can be provided easily and inexpensively.

  Further, in the film break detection mechanism according to the present invention, the sensor member is a contact type sensor, and the contact type sensor is in contact with a region of the outer peripheral surface of the pressing shaft that is opposed to a region that contacts the multi film. It is preferable that it is arrange | positioned so that it may contact | connect. By doing so, the sensor member can be reliably operated with a simple configuration.

  As described above, according to the film break detection mechanism according to the present invention, the pressing shaft that contacts the multi-film is supported by the support shaft via the biasing member, and the multi-film does not exist. The presence or absence of the multi film is detected by detecting the position of the pressing shaft in the state and the position of the pressing shaft in the state where the multi film is present by the sensor member. Since the presence or absence of the multi-film is detected in a state where the urging force of the urging member is working, when the multi-film covering work is started, when traveling is stopped during the work, or when the work machine meanders during the work, Alternatively, the sensor member can be reliably operated even when wind or vibration of the work machine occurs, thereby confirming the presence or absence of the multi-film. It is possible to detect in. Moreover, in the said multi-film coating | coated apparatus, since the said alarm device is operated by the said sensor member, a highly reliable alarm can be performed with respect to an operator, and the workability | operativity of multi-film coating | working work is improved so much. Can do.

  Further, when the urging member is a plurality of springs arranged at equal intervals in the circumferential direction with respect to the axis of the support shaft, the urging member can be provided easily and inexpensively. .

  Furthermore, the sensor member is a contact sensor, and the contact sensor is disposed so as to contact a region opposite to a region of the outer peripheral surface of the pressing shaft that contacts the multi-film, The sensor member can be reliably operated with a simple configuration.

  Hereinafter, preferred embodiments of a film break detection mechanism according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a state in which a multi-film coating apparatus 100 to which a film break detection mechanism 200 according to an embodiment of the present invention is applied is attached to a main body A of a work vehicle, as viewed from the rear of the work vehicle. FIG. 2 is a side view centering on the multi-film coating apparatus 100 and the film breakage detection mechanism 200 of FIG.

  As shown in FIG. 1, a standing device B is mounted on the rear portion of the tractor A, which is an example of the main vehicle of the working vehicle, and a multi-film coating device 100 is further provided on the rear side of the vehicle.

  As shown in FIG. 2, the erecting apparatus B includes a spiral rotor 11, a rotor cover 12 that covers the spiral rotor 11, and a saddle-shaped ridge forming portion 13. With such a configuration, when forming the straw, the soil is cultivated by the spiral rotor 11 and collected at the center in the vehicle width direction. By being guided and exiting from the saddle forming portion 13, it is formed into a bowl-shaped bowl C which is raised at the center in the vehicle width direction.

  The multi-film coating apparatus 100 covers the ridge C thus formed from both hem parts to the top with a multi-film F, and includes a pair of left and right main frames 110 provided at both ends in the vehicle width direction. The pair of main frames 110 protrude rearward from the erecting device B.

  The pair of main frames 110 are provided with a pair of left and right film roll support rods 120, respectively, and a pair of left and right tension roll support rods 130 are provided behind the pair of film roll support rods 120, respectively. ing.

  Each of the pair of film roll support rods 120 has a bent portion 120a that protrudes obliquely downward and rearward in the vehicle and is bent toward the rear of the vehicle in the middle. The reversing roll 230 is rotatably supported. The pair of film roll support rods 120 includes a pair of left and right film roll support rods 121 protruding from the rear of the vehicle, and a sensor installed between the pair of film roll support rods 121 along the vehicle width direction. And a support rod 122. The pair of film roll support rods 121 are respectively provided with a pair of left and right roll pivot shafts 123 projecting inward in the vehicle width direction at the free ends, and between the pair of roll pivot shafts 123. The multi film roll 140 is rotatably supported. The sensor support rod 122 supports a sensor member 220 constituting the film break detection mechanism 200 at the center in the vehicle width direction.

  The pair of tension roll support rods 130 project downward in the vehicle vertical direction, and rotatably support the tension roll 210 constituting the film breakage detection mechanism 200 at the lower end.

  A pair of left and right earthing wheel support rods 111 are extended from the rear end portions of the pair of main frames 110, respectively. Each of the pair of earth retaining ring support rods 111 protrudes downward and is bent obliquely downward and rearward in the middle, and the pair of left and right film retaining rings 112 are connected to the lower end portion via the support member 111a at the bent portion. The pair of left and right earthing wheels 113 are supported by The pair of film retaining rings 112 restrains the skirt of the multi-film F covered with the collar C. Thereby, especially the clearance gap part in the skirt part of the collar C can be suppressed, and this clearance gap part can be eliminated. The pair of earthing wheels 113 gathers the soil in the field to the bottom of the multi-film F so as to be placed on the bottom. Thereby, it is possible to prevent the skirt portion of the multi-film F from being turned up or soared by wind or the like.

  In the multi-film coating apparatus 100, a pair of left and right guide wheel support rods 150 are provided on the front side of the vehicle with respect to the pair of film roll support rods 120, respectively. A pair of left and right guide wheels 151 are supported at the lower end. Thereby, the height of the multi-film coating apparatus 100 as a whole with respect to the erecting apparatus B can be adjusted. Further, a roll support rod 160 having an extended portion 161 that extends outward in the vehicle width direction at the lower end portion is provided behind the pair of tension roll support rods 130. The U-shaped roll 162 is supported by the extending portion 161. Thereby, it can suppress from above so that the said multi film F may closely_contact | adhere to the bowl-shaped ridge C.

  Next, the film break detection mechanism 200 will be described below with reference to FIGS. FIG. 3 is a schematic side view for explaining the operation of the film break detection mechanism 200 of FIGS. 1 and 2 in a state where the multi-film F is present, and FIG. 3A is an overall view showing the operation state. FIG. 3B is an enlarged view mainly showing the film breakage detection mechanism 200 portion in the operation state. FIG. 4 is a schematic side view for explaining the operation of the multi-film F in the film-out state with respect to the film-out detection mechanism 200 of FIGS. 1 and 2, and FIG. 4 (A) shows the operation state. FIG. 4B is an enlarged view mainly showing a film breakage detection mechanism 200 portion in the operation state. 3 and 4, the sensor support rod 122, the bent portion 120a, and the tension roll support rod 130 are not shown.

  As shown in FIGS. 3 and 4, the film break detection mechanism 200 includes the tension roll 210 and the sensor member 220 described above. The tension roll 210 includes a support shaft 211, a pressing shaft 212, and an urging member 213.

  The support shaft 211 is inserted in the movement path of the multi-film F, and is supported by the pair of support members 130 (not shown in FIGS. 3 and 4) so as to be rotatable about an axis. In this embodiment, the pressing shaft 212 is a hollow shaft that is extrapolated to the support shaft 211, so as to come into contact with the multi-film F that moves along a moving path, and via a biasing member 213. The support shaft 211 is supported so as to rotate about the axis integrally with the support shaft 211. As a result, the pressing shaft 212 can be driven and rotated integrally with the support shaft 211 as the multi-film F abutted against the pressing shaft 212 moves. The support shaft 211 and the pressing shaft 212 may not be rotatable around the axis. In this case, the multi-film F is slid on the pressing shaft 212 when contacting the pressing shaft 212.

  Further, in this embodiment, the biasing member 213 is disposed between the outer peripheral surface 211a of the support shaft 211 and the inner peripheral surface 212a of the pressing shaft 212, and the axis of the support shaft 211 is used as a reference. The plurality of springs are arranged at equal intervals in the circumferential direction (four springs arranged so as to face each other in the illustrated example). Accordingly, the pressing shaft 212 is arranged at a concentric position concentric with the support shaft 211 by the biasing member 213 in a state where the multi-film F is not present, and in a state where the multi-film F is present. Can be arranged at an eccentric position eccentric to the support shaft 211 by the tension of the multi-film F. Each of the plurality of springs 213 has one end fixed to the outer peripheral surface 211a of the support shaft 211 and the other end fixed to the inner peripheral surface 212a of the pressing shaft 212. The support shaft 211 and the pressing shaft 212 may be connected to the plurality of springs 213 so as not to rotate relative to each other, and the pressing shaft 212 is movable in the radial direction with respect to the support shaft 211 via the plurality of springs 213 and relative to the axis. The plurality of springs 213 may be engaged by concavo-convex engagement by a concave portion or a convex portion such as a pin formed on the support shaft 211 and the pressing shaft 212, respectively.

  In the present embodiment, the pressing shaft 212 is supported by extrapolation on the support shaft 211, but the pressing shaft 212 may be supported by insertion on the support shaft 211. In this case, as shown in FIG. 5, the support shaft 211 is a pair of hollow support shafts spaced apart in the axial direction (vehicle width direction), and the holding shaft 212 has both ends 212 ′ at the pair of hollow support shafts. The urging members 213 may be disposed between the pair of hollow support shafts 211 and both ends of the pressing shaft 212, respectively, while being inserted into the pair 211. In FIG. 5, only the pressing shaft 212 end 212 ′ and the hollow support shaft 211 on one side of the both ends are shown, but the other pressing shaft 212 end 212 ′ and the hollow support shaft 211 are also one side. The configuration is substantially the same as that of the side, and the illustration of the other side is omitted here.

  In this case, the biasing member 213 is disposed between the inner peripheral surface 211 b of the support shaft 211 and the outer peripheral surface 212 b of the pressing shaft 212, and is based on the axis of the pressing shaft 212. It is preferable that the plurality of springs are arranged at equal intervals in the circumferential direction (four springs arranged so as to face each other as in the illustrated example). By doing so, the pressing shaft 212 is arranged at a concentric position concentrically with the support shaft 211 by the biasing member 213 in a state where the multifilm F is not present, and the multifilm F is present. In the state, it can be arranged at an eccentric position that is eccentric with respect to the support shaft 211 by the tension of the multi-film F. Each of the plurality of springs 213 has one end fixed to the inner peripheral surface 211b of the support shaft 211 and the other end fixed to the outer peripheral surface 212b of the press shaft 212, and the support shaft 211 and the press shaft. 212 may be connected to the plurality of springs 213 so as not to rotate relative to each other, and the pressing shaft 212 is movable in the radial direction with respect to the support shaft 211 via the plurality of springs 213 and relative to the axis. The plurality of springs 213 may be engaged by concavo-convex engagement by a concave portion or a convex portion such as a pin formed on the support shaft 211 and the pressing shaft 212, respectively.

  The sensor member 220 detects whether the pressing shaft 212 is located in a concentric position or an eccentric position. In this embodiment, the sensor member 220 is a region in contact with the multi-film F on the outer peripheral surface of the pressing shaft 212. When the holding shaft 212 is located at a concentric position (see FIG. 4B), the holding shaft 212 is in a non-contact non-operating state. When the pressing shaft 212 is located at an eccentric position (see FIG. 3B), the contact sensor is in an operating state in contact with the pressing shaft 212.

  The multi-film coating apparatus 100 may be provided with means for allowing an operator to recognize the remaining amount of the multi-film F during work. In this way, the operator can recognize the remaining amount of the multi-film F while working, and for example, the currently installed multi-film roll 140 determines whether or not work can be performed for all of the appropriations to be worked on. can do. In addition, even in the middle of the work, it is possible to predict in advance where the multi-film F will be lost, so that the work such as replacement of the multi-film roll 140 can be dealt with early.

  As the remaining amount recognizing means, as shown in FIG. 6, one that includes a measuring device 20 that measures the number of rotations of the rotating member 20 a that rotates according to the movement of the multi-film F can be exemplified. In this case, the measuring instrument 20 is disposed between the multi-film roll 140 and the tension roll 210, and the rotating member 20a is in a maximum diameter state as shown in FIG. The multi-film roll 140 may be disposed at a position where the multi-film F is pressed away from the multi-film roll 140, or as shown in FIG. The multi-film F may be disposed at a position where the multi-film F is pressed in the winding direction. In this embodiment, the multi-film F is wound around the tension roll 210 so that the multi-film roll 140 and the tension roll 210 rotate in opposite directions. As shown in FIG. 6D, the multi-film roll 140 and the tension roll 210 may be wound around the tension roll 210 so as to rotate in the same direction. Also in this case, as shown in FIG. 6C, the rotating member 20a is disposed at a position where the rotating member 20a is pressed in the direction of pulling the multi-film F away from the multi-film roll 140 in the maximum diameter state. As shown to (D), you may arrange | position in the position pressed in the direction which winds the said multi film F with respect to the said multi film roll 140 in the state of the minimum diameter. In any case, even if the diameter of the multi-film roll 140 decreases with use, the number of rotations of the rotating member 20a can be continued through the use of the multi-film roll 140 without adjusting the position of the measuring instrument 20. Can be measured.

  In addition, the measuring instrument 20 may count up the amount of the multi-film F drawn out based on the number of rotations of the rotating member 20a, or the multi-film F wound around the multi-film roll 140. The entire length of the multi-film F is set by subtracting the pull-out amount of the multi-film F based on the number of rotations of the rotating member 20a from the preset total length of the multi-film F in advance. The remaining amount may be counted down. In any case, the calculated value calculated by the measuring instrument 20 can be numerically displayed on a display device (not shown) provided on the operation panel of the tractor A, for example. By doing so, the operator can recognize the remaining amount of the multi-film F during work.

  Moreover, as shown in FIG. 7, the imaging device 30 may be arrange | positioned in the position (For example, the rear part of the said tractor A etc.) which can image | photograph a working state. In this case, the image taken by the imaging device 30 can be displayed as an image on the display device 31 disposed at a position where the worker can view the image only by moving his / her line of sight during work. By doing so, the work state (for example, the film cut state of the multi-film F and the work accuracy such as whether the multi-film F is well covered) can be visually recognized by the operator. Even if a problem occurs (for example, a problem that the multi-film F is out of film or the multi-film F is not covered well), the display device 31 can immediately check the condition, and the problem has occurred. It is possible to eliminate the waste of continuing work. In addition, the display device 31 is disposed at a position where the worker can visually recognize only by moving his / her line of sight during the work, and the worker can work while riding on the tractor A while looking forward. Therefore, it is possible to visually recognize the work state without causing any troubles, thereby enabling highly accurate work and reducing the burden on the worker.

  By the way, regardless of the presence or absence of the measuring instrument 20, the imaging device 30, etc., the worker may look back at the time of working and directly view the working state. In this case, in the tractor A tractor having a cabin or the like that includes a frame of the tractor A, for example, a cabin that covers the periphery of the driver's seat, a blind spot is easily formed by the frame of the cabin. Therefore, in the tractor A, a mirror 40 (see FIG. 8) that allows the operator to visually recognize the working state of the multi-film coating apparatus 100 may be provided behind the vehicle with respect to the driver seat S. By doing so, the worker can visually recognize the working state with a small blind spot by looking back at the mirror 40 when working. The mirror 40 is attached to a work lamp 41 provided on the rear side of the vehicle with respect to the driver's seat S (for example, a work lamp 41 provided on the upper rear side of the cabin in the tractor A having a cabin specification as shown in FIG. 8). It is preferable to be provided. As shown in FIG. 8, when the work lamp 41 is provided at a high position, the work state can be looked down from a high position, and the work state can be visually recognized as a whole. Further, the mirror 40 may be disposed integrally with the work lamp 41. By doing so, it is not necessary to provide the mirror 40 as a separate body, so that the installation space for the mirror 40 can be reduced and the cost can be reduced accordingly. Further, depending on the positional relationship between the rearview mirror M provided in front of the driver's seat and the mirror 40, an operator can visually recognize the mirror 40 using the reflection of the rearview mirror M. If this is possible, the operator can check the working state of the multi-film coating apparatus 100 from the mirror 40 through the rearview mirror M in the driving posture, thereby reducing the burden on the operator. it can.

  Moreover, about the multi-film roll 140 applied to the multi-film coating apparatus 100, a marker may be attached from the predetermined remaining position of the multi-film F to the end. By doing so, since the remaining amount of the multi-film F can be recognized, it is possible to know in advance the replacement time of the multi-film roll 140, thereby improving work efficiency. As this marker, a linear marker m1 having a color different from the color of the multifilm F (see FIG. 9A), or a marker m2 such as a number indicating the remaining length of the multifilm F (FIG. 9). (See (B)). As shown in FIG. 9A, when the number of remaining multifilms F becomes small, a linear marker m1 having a color (for example, green) different from the color (for example, black) of the multifilm F appears, and this marker m1 Thus, the remaining amount of the multi-film F can be recognized. Further, as shown in FIG. 9B, when the remaining multifilm F is reduced, a marker m2 such as a number indicating the remaining length of the multifilm F is displayed. The amount can be recognized. Note that, as described above, the burden on the operator can be further reduced by combining the imaging device 30 and the display device 31 with the configuration in which the mirror 40 is provided.

  In the film breakage detection mechanism 200 described above, when the multifilm F is coated in the multifilm coating apparatus 100, the multifilm F drawn out from the multifilm roll 140 is placed on the support shaft 211. The vehicle travels on the moving path while being in contact with the pressing shaft 212 supported via the urging member 213, and is separated from the pressing shaft 212 when the multi-film F disappears. At this time, the pressing shaft 212 is arranged at a concentric position concentrically with the support shaft 211 by the biasing member 213 in a state where the multifilm F is not present, and in a state where the multifilm F is present. Is arranged at an eccentric position that is eccentric with respect to the support shaft 211 by the tension of the multi-film F. In the sensor member 220, when the pressing shaft 212 is located at a concentric position, the pressing shaft 212 is not in contact with the pressing shaft 212 (see FIG. 4), and when the pressing shaft 212 is positioned at an eccentric position. Is in an operating state in contact with the pressing shaft 212 (see FIG. 3). Then, in the multi-film coating apparatus 100, based on the detection result by the sensor member 220, an alarm device (not shown) (for example, an alarm buzzer) is activated, and the multi-film F is lost during the multi-film coating operation. The operator is notified whether or not.

  Thus, according to the film break detection mechanism 200, the pressing shaft 212 that is in contact with the multi-film F is supported by the support shaft 211 via the biasing member 213, and the multi-film F is The sensor member 220 detects the presence or absence of the multi-film F by detecting the position of the press-down shaft 212 in a state where it does not exist and the position of the press-down shaft 212 in the state where the multi-film F is present. Therefore, in other words, since the presence or absence of the multi-film F is detected in a state where the urging force of the urging member 213 is working, when the multi-film covering work is started or when traveling is stopped during the work, Even when the working machine meanders during the work, or when wind or vibration of the working machine occurs, the sensor member 220 can be reliably operated. It can be, thereby, it is possible to reliably detect the presence of the multi-film F. In the multi-film coating apparatus 200, since the alarm device is operated by the sensor member 220, a highly accurate alarm can be given to the worker, and the workability of the multi-film coating work is improved accordingly. Can be made.

  Further, since the urging member 213 is a plurality of springs arranged at equal intervals in the circumferential direction with respect to the axis of the support shaft 211, the urging member 213 can be provided simply and inexpensively. it can.

  Further, the sensor member 220 is a contact type sensor, and the contact type sensor 220 is arranged so as to come into contact with a region 212d opposite to the region 212c that comes into contact with the multi-film F on the outer peripheral surface of the pressing shaft 212. By being provided, the sensor member 220 can be reliably operated with a simple configuration.

FIG. 1 is a perspective view of a state in which a multi-film coating apparatus to which a film breakage detection mechanism according to an embodiment of the present invention is applied is attached to a main body of a work vehicle, as viewed from the rear of the work vehicle. FIG. 2 is a side view mainly showing the multi-film coating apparatus and the film breakage detection mechanism portion of FIG. FIG. 3 is a schematic side view for explaining the operation of the film break detection mechanism of FIGS. 1 and 2 in a state where a multi-film exists, and FIG. 3A is an overall view showing the operation state. FIG. 3B is an enlarged view mainly showing a film breakage detection mechanism portion in the operation state. FIG. 4 is a schematic side view for explaining the operation of the film breakage state of the multifilm in the film breakage detection mechanism of FIGS. 1 and 2, and FIG. 4A is an overall view showing the operation state FIG. 4B is an enlarged view mainly showing a film breakage detection mechanism portion in the operation state. FIG. 5 is a schematic perspective view showing an example of a configuration in which the pressing shaft is inserted and supported by the support shaft in the film break detection mechanism. FIG. 6 is a schematic side view showing a measuring instrument disposed between a multi-film roll and a pressing shaft, and FIGS. 6A and 6C show a state in which the rotating member has a maximum diameter. FIG. 6 (B) and FIG. 6 (D) show the state where the rotating member is in the minimum diameter state. The state arrange | positioned in the position pressed in the direction which winds the said multi film F with respect to the multi film roll 140 is shown. FIG. 7 is a schematic side view showing an example of a configuration in which the imaging device is arranged at a position where the working state can be photographed. FIG. 8 is a schematic perspective view of an example of a configuration in which a mirror that allows an operator to visually recognize the working state of the multi-film coating apparatus is provided behind the vehicle with respect to the driver's seat in the tractor as viewed obliquely from the front. is there. FIG. 9 is a diagram showing an example of a multi-film roll provided with a marker from a predetermined remaining position of the multi-film to the end, and FIG. 9A shows a line of a color different from the color of the multi-film. 9B shows a multi-film roll provided with markers such as numerals indicating the remaining length of the multi-film.

F ... multi-film 100 ... multi-film coating device 140 ... multi-film roll 200 ... film break detection mechanism 210 ... tension roll 211 ... support shaft (hollow support shaft) 211a ... outer peripheral surface of support shaft 212 ... pressing shaft 212 '... pressing shaft Both end portions 212a ... inner peripheral surface 212c of the pressing shaft ... multi-film contact region 212d ... region opposite to the multi-film contact region 213 ... biasing member 220 ... sensor member

Claims (6)

The multi-film roll is configured to cover the soil with the multi-film by placing the soil gathered by the earth-raising wheel on the skirt while pressing the hem of the multi-film drawn out from the multi-film roll onto the soil with the film retaining ring. A film break detection mechanism applied to a multi-film coating apparatus,
A tension roll inserted in the movement path of the multi-film from the multi-film roll to the film retaining ring so as to give tension to the multi-film drawn from the multi-film roll, and a sensor member,
The tension roll, a support shaft, wherein the multi-film via a biasing member so as to contact with and a pressing shaft which is supported on the support shaft, the pressing axis is the moving path for moving the moving path relative to the support shaft the pressing axis by the tension against the urging force of the urging member of the multi-film in the that giving tension to the multi-film by abutting the multi-film state to move It is arranged at an eccentric position that is eccentric , and in the film cut state of the multi-film, the pressing shaft is arranged at a concentric position concentric with the support shaft by the urging force of the urging member,
The sensor member is a film breakage detection mechanism the pressing axis, characterized the Turkey detect whether the position in any of the concentric position or eccentric position.   The film breakage detecting mechanism according to claim 1, wherein the support shaft is rotatable about an axis, and the pressing shaft is configured to rotate about the axis integrally with the support shaft. . The holding shaft is a hollow shaft that is extrapolated to the support shaft,
The film breakage detection mechanism according to claim 1 or 2, wherein the biasing member is disposed between an outer peripheral surface of the support shaft and an inner peripheral surface of the pressing shaft. The support shaft is a pair of hollow support shafts spaced apart in the axial direction,
Both ends of the pressing shaft are inserted into the pair of hollow support shafts,
The film breakage detection mechanism according to claim 1 or 2, wherein the urging members are respectively disposed between the pair of hollow support shafts and both end portions of the pressing shaft.   5. The film breakage detection according to claim 1, wherein the biasing members are a plurality of springs arranged at equal intervals in the circumferential direction with respect to an axis of the support shaft. mechanism. The sensor member is a contact sensor,
6. The contact sensor according to claim 1, wherein the contact sensor is disposed so as to be in contact with a region opposite to a region in contact with the multi-film on an outer peripheral surface of the pressing shaft. Film break detection mechanism.

Images