JP3670347B2 - Interval running position detector - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is for controlling the traveling of a combine etc. along the planting strip direction of the grain straw, and detects the position of the left and right grain straws while traveling between the stripes to detect the traveling position. The present invention relates to an inter-strip travel position detection device.
[0002]
[Prior art]
Conventionally, for example, in a combine, the rice harvest is harvested in units of strips by traveling along the direction of the row in which the rice stock that is the cereal is planted. In order to automatically follow the strip direction, the strip direction is detected during traveling and the traveling direction is controlled based on the detection signal.
[0003]
This is provided at the front end side in the traveling direction of the combine. For example, the ones shown in FIGS. 14 to 17 are considered. That is, as shown in FIG. 14, the detection levers 2 and 3 are rotatably arranged on the left and right sides of the main body case 1, and the left and right detections are performed when the combine moves along the strip of rice. The levers 2 and 3 are rotated when they come into contact with the rice plants on both sides, and a detection signal is obtained by detecting the rotation angle at that time as a change in resistance value.
[0004]
When the detection levers 2 and 3 are in contact with the left and right rice straws during forward movement, they are rotated by θA in the clockwise direction or θB in the counterclockwise direction from the origin position, and contact with the rice straw during backward movement. Are rotated by θa in the counterclockwise direction or θb in the clockwise direction from the origin position (the holder 7 rotates to θa and θb, but the resistance film 8a of the resistor plates 8 and 9). , 9a are formed in the region up to θa ′ and θb ′ as shown in FIG. 15, and the resistance value does not change any more when rotated beyond θa ′ and θb ′. And the detection levers 2 and 3 are urged | biased so that it may return to an origin position (illustrated position) with the spring member which is not illustrated in the state which does not contact.
[0005]
As shown in FIG. 15, the main body case 1 is provided with variable resistors 4 and 5 that are provided so that the movable contact rotates as the detection levers 2 and 3 rotate. The right variable resistor 4 includes a holder 7 having a movable contact 6 fixed thereto and a resistor plate 8, and the left variable resistor 5 includes a holder 7 having a movable contact 6 fixed and a resistor plate 9. It is configured. The holder 7 is formed by caulking and fixing the movable contact 6 to the two protrusions 10a and 10a formed on the disc-shaped holder member 10 shown in FIG. 17, and the same one is rotated by 180 °. They are arranged back and forth (see FIG. 16).
[0006]
On the other hand, the resistor plates 8 and 9 are formed by forming the resistance films 8a and 9a on the outer peripheral side of the disc-shaped substrate and forming the conductor films 8b and 9b on the inner peripheral side. These two terminals are connected to each other by electrode terminals 11a and 11b, and the conductor films 8b and 9b are connected to the electrode terminals 12a and 12b, respectively. Since the movable contact 6 of the holder 7 is moved between the resistance films 8a and 9a and the conductor films 8b and 9b, a resistance value corresponding to the rotation angle of the detection levers 2 and 3 is set and the electrode terminals 12a, It can be detected from 12b.
[0007]
[Problems to be solved by the invention]
By the way, in the thing of the structure mentioned above, since the resistor plates 8 and 9 differ in the rotational movement range of the movable contact 6 by rotation of the above-mentioned detection levers 2 and 3 (it shows by the oblique line area | region Sa and Sb in FIG. 15). ) Since the electrical effective angles of the resistance films 8a and 9a are different, they cannot be formed in the same manner. Therefore, it is necessary to manufacture them separately for the right side and the left side.
[0008]
However, since the resistors 8 and 9 are difficult to distinguish from each other in appearance, there is a risk that the right and left will be assembled at the time of assembly. In the end, great care is taken to prevent such mounting errors. It is necessary to perform assembly work by paying, and there is a problem that the manufacturing cost becomes high.
[0009]
The present invention has been made in view of the above circumstances, and the object thereof is to make it possible to assemble the variable resistor without fail in correspondence with the left and right detection levers, and to perform assembly work quickly. An object of the present invention is to provide an inter-strip travel position detection device.
[0010]
[Means for Solving the Problems]
The present invention detects the position of the left and right culms by the rotation angle of a pair of detection levers provided corresponding to the left and right during traveling between the lanes in a traveling state along the planting strip direction of the culms. It is intended for the inter-strip travel position detection device that detects the position,
A main body support portion that supports the base end portions of the pair of detection levers so as to be rotatable at positions that are symmetrical with respect to the traveling direction;
A pair of variable provided with a movable contact member that is provided on the main body support portion corresponding to each of the pair of detection levers and that rotates with the rotation thereof, and a resistor on which the movable contact of the movable contact member slides. A resistor,
The pair of variable resistors are arranged in a state where they are arranged side by side, and the resistors are arranged in symmetrical positions, and the right and left movable contact members are arranged in symmetrical positions, The movable contact member has a configuration in which a fixed member for attaching the movable contact is formed by using a movable contact plate formed in a shared shape for right and left having a right mounting portion and a left mounting portion. It has characteristics (invention of claim 1).
[0012]
And a case for holding the resistor of the pair of variable resistors,
The resistor is fixed to the case with the resistor disposed in the case, and is fixed to the case by pressing the peripheral edge with the surface on which the movable contact of the resistor slides exposed. A cover body can be provided (invention of claim 2 ).
[0013]
[Action]
According to the inter-strip travel position detecting device according to claim 1, when the variable resistor is assembled to the main body support portion, it is arranged so as to be symmetrical in correspondence with the left and right detection levers. Can be performed easily and quickly, and workability is improved.
[0014]
When the right or left movable contact member is formed, the movable contact is fixed by using the necessary fixed member of the movable contact plate on which the fixed member is formed corresponding to both the right and left. By doing so, it becomes possible to obtain the corresponding parts, and it is possible to share parts, and even if the fixing member on one side is not usable, the other fixing member is used. The inconvenience of handling the movable contact plate as a defective product can be eliminated.
[0015]
According to the inter-strip travel position detecting device according to claim 2, when fixing each resistor of the pair of variable resistors to the case, the cover body is simply fixed with a screw in a state in which the resistor is disposed on the case. By simple work, the resistor can be securely fixed in a state of being pressed against the case by pressing the peripheral edge of the resistor against the case with the surface on which the movable contact of the resistor slides exposed. Become.
[0016]
【Example】
The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 is an overall view from above, and a main body case 21 as a main body support portion is disposed, for example, at a front portion of the combine. The main body case 21 is provided with two detection levers 22 and 23 so as to protrude left and right, and their base end portions are attached so as to be able to turn to symmetrical positions. Moreover, although not shown in figure, the length dimension of these detection levers 22 and 23 is set to the dimension which considered the width | variety between the planting strips of a grain basket, and an allowable error range.
[0017]
FIG. 3 is a diagram showing the whole in a state where the traveling direction is viewed from the rear side. The detection levers 22 and 23 described above are attached to the lower surface side of the main body case 21 by support portions 22a and 23a. The support portions 22a and 23a are fixed to a rotating shaft 24 inserted in the vertical direction on the main body case 21 side by screws 25. The rotary shaft 24 is urged by a torsion coil spring 26 disposed therein, and when an external force is applied to the detection levers 22 and 23, the rotary shaft 24 can rotate within the range shown from the return position (the position shown by the solid line in FIG. 2). Is provided.
[0018]
In this case, as shown in FIG. 4, the left and right detection levers 22 and 23 are rotated backward at a larger angle as the distance from the center position becomes shorter when they touch the cereal in the forward state, It is set so that it is rotated by the maximum θA or θB, and is rotated by the maximum θa or θb in the same manner when the cereal is touched in the reverse state.
[0019]
Variable resistors 27 and 28 for detecting the rotation angle of the rotation shaft 24, that is, the detection levers 22 and 23, are disposed on the upper side of the rotation shaft 24. The right variable resistor 27 includes a right holder 30 which is a movable contact member to which a movable contact 29 is fixed, and a resistor plate 31, and the left variable resistor 28 is a movable contact in which the movable contact 29 is fixed. It consists of a left holder 32 and a resistor plate 31 as members.
[0020]
The right holder 30 and the left holder 32 are fixed by caulking the movable contact 29 to one of the two right protrusions 33a and 33a or the two left protrusions 33b and 33b formed on the holder member 33 shown in FIG. When the holder member 33 is arranged symmetrically, as shown in FIG. 5, the movable contact 29 is set to be located on the same side for the right side and the left side. ing.
[0021]
On the other hand, the resistor 31 is commonly used for the variable resistors 28 and 29, and is formed by forming a resistance film 31a on the outer peripheral side of a disk-shaped substrate and forming a conductor film 31b on the inner peripheral side. The electrode terminals 34 and 35 are connected to both terminals of the resistance film 31a, and the electrode terminal 36 is connected to the conductor film 31b. Since the brush portions 29a and 29b of the movable contact 29 of the right holder 30 or the left holder 32 move with respect to the resistor plate 31 in contact with the resistance film 31a and the conductor film 31b, respectively, the detection lever 22, The resistance value corresponding to the rotation angle 23 is set, and this can be detected by measuring the resistance value or voltage value between the electrode terminals 34 and 35 and the electrode terminal 36 from the outside. It is.
[0022]
As described above, the detection levers 22 and 23 are configured such that the rotatable range rotates by θA and θB with respect to the forward direction, and rotates by θa and θb with respect to the backward direction. Correspondingly, the right and left variable resistors 28 and 29 are shown in FIG. 1 (actually, the variable resistors 28 and 29 are located on the back side of the page but are shown on the front side for convenience. ), The movable contact 29 with respect to each resistor plate 31 moves with the rotation of the detection levers 22 and 23, but the regions where the resistance films 31a and 31a are formed are the ranges indicated by the hatched regions SA and SB in the figure. It is formed with. That is, they rotate by θA and θB with respect to the forward direction, respectively, and are detected only with θa ′ smaller than θa and θb ′ smaller than θb with respect to the backward direction. The reason why the detection angle with respect to the backward direction is small is that it is set to detect the rotational state in the backward direction, not the rotational angle.
[0023]
In the configuration of this embodiment, since the rotational movement range of the movable contact 29 can be set to the above-described range, the resistor plates 31 and 31 are provided by the right and left variable resistors 27 and 29, respectively. The resistance regions formed in the resistance films 31a and 31a can be set at the same angle. That is, the same resistor plate 31 can be used for the right side and the left side.
[0024]
In the present embodiment configured as described above, the detection levers 22 and 23 are located on the left and right of the grain straw while the grain straw is planted while being attached to the tip of the combine. When contacted, the smaller the distance from the main body case 21 is, the larger the angle is rotated. A predetermined voltage V is applied in advance between the electrode terminals 34 and 35 connected to both terminals of the resistance films 31a and 31a of the variable resistors 27 and 28.
[0025]
As a result, when the movable contacts 29 and 29 of the variable resistors 27 and 28 move in accordance with the rotation of the detection levers 22 and 23, as shown in FIG. 7, the output voltage V2 corresponding to the moved rotation angles θA and θB. , V1 can be obtained from the electrode terminals 36, 36, and the rotation angles θA, θB of the detection levers 22, 23 are detected based on the voltage signals V2, V1, and the interval position of the center position of the main body case 21 is detected. It is possible to detect a deviation from
[0026]
According to this embodiment, the right and left variable resistors 27 and 28 are arranged at symmetrical positions, and the movable contact 29 is located on the same side of the right and left holders 30 and 32. Therefore, the moving range of the movable contact 29 with respect to the resistor plate 31 can be set in the same area for the right and left, and can be used without distinction. Therefore, the workability can be improved.
[0027]
Further, the right holder 30 or the left holder 32 can be formed in common by fixing the movable contact 29 to either the right protrusion 33a or the left protrusion 33b formed on the holder member 33, so that the protrusion 33a, Even if any one of 33b is defective, it can be used by using the other, so that the manufacturing cost can be reduced.
[0028]
FIGS. 8 to 13 show a second embodiment of the present invention. Hereinafter, parts different from the first embodiment will be described. That is, in the second embodiment, in the component part of the two variable resistors 27 and 28, in the part of the resistor case 37 attached to the upper part of the main body case 21, two resistor plates 31 are provided. This is an improvement of the fixed structure. 8 and 9 show in detail the vertical cross section and bottom surface portion of the resistor case 37, and FIGS. 10 and 11 show the vertical cross section and top surface portion on the case 21 side corresponding thereto in detail. ing.
[0029]
In FIGS. 8 and 9, doughnut-shaped flat resistor plates 31 and 31 are fitted into protrusions 37 a and 37 a of a resistor case 37, respectively, and a cover 38 as a cover body is fixed by screws 39. Yes. As shown in FIG. 13, the cover 38 has openings 38a and 38a formed in portions corresponding to the sliding surface of the resistor plate 31, and is positioned so as to sandwich the two openings 38a and 38a. Three concave screwing portions 38b are formed. The cover 38 is fixed to the resistor case 37 by a screw 39 at the screwing portion 38b. In this case, as shown in FIG. 12, the step size of the screwing portion 38b of the cover 38 is set slightly shorter (indicated by Δd in the figure) than the step size of the resistor plate 31, so the screw 39 is attached. Then, the resistor plate 31 is pressed by the cover 38 to be fixed in the pressure contact state.
[0030]
10 and 11, the holders 29 and 30 attached to the rotating shafts 24 and 24 on the detection levers 22 and 23 side are provided so as to face each other in contact with the sliding surfaces of the resistor plates 31 and 31. The movable contacts 29, 29 fixed to the holders 29, 30 slide on the sliding surfaces.
[0031]
A peripheral wall portion 38 c is formed on the cover 38, and is fitted into a groove portion 37 b formed on the resistor case 37. The peripheral wall portion 38c is opened on the electrode terminals 34 to 36 side of the resistor plate 31, and the lead wire 40 connected to the electrode terminals 34 to 36 is led out into the output cable portion 41 through this portion. ing. The resistor case 37 has flanges 42 formed on the outer periphery thereof, and screw holes 43 are formed at four corners thereof. The case 21 is formed with an inclined surface 44 and is attached to the case 21 with the O-ring 45 fitted to the flange 42 of the resistor case 37 and fixed to the screw hole 46 of the case 21 with a screw. It is configured to ensure airtightness.
[0032]
According to the second embodiment, since the resistor plates 31 and 31 are fixed to the resistor case 37, the cover 38 is fixed to the pressure contact state by the screws 39. Therefore, the conventional resistor plate is used. The troublesome work such as potting and fixing the resin with the adhesive 31 temporarily fixed with an adhesive or screws is not required, and it can be mounted with simple and stable quality, and the resistor plate 31 is damaged. This makes it easy to replace parts and improves maintainability.
[0033]
The present invention is not limited to the above embodiment, and can be modified or expanded as follows.
You may comprise a variable resistor so that the rotation angle to the reverse direction of the detection levers 22 and 23 can also be detected.
The shape of the detection lever can be set to an appropriate shape such as a linear shape or an arc shape.
A plurality of pairs of detection levers and variable resistors may be provided.
The variable resistor may be a two-terminal one in addition to the three-terminal one.
[0034]
【The invention's effect】
As is clear from the above description, the inter-row travel position detection device of the present invention has the following effects.
That is, according to the inter-strand travel position detection device according to claim 1, when the variable resistor is assembled to the main body support portion, it is arranged so as to be symmetrical in correspondence with the left and right detection levers. Assembling work can be performed easily and quickly, and the workability is improved.
[0035]
When the right or left movable contact member is formed, the movable contact is fixed by using the necessary fixed member of the movable contact plate on which the fixed member is formed corresponding to both the right and left. By doing so, it becomes possible to obtain the corresponding parts, and it is possible to share parts, and even if the fixing member on one side is not usable, the other fixing member is used. There is an excellent effect that the inconvenience of handling the movable contact plate as a defective product can be eliminated.
[0036]
According to the inter-strand travel position detecting device according to claim 2, the cover body is fixed with a screw in a state where the resistor is disposed on the case, thereby exposing the sliding surface of the resistor and pressing the peripheral portion thereof. Since the resistor is fixed to the case, the mounting process is simplified, and it is not necessary to perform processing such as adhesive or potting, so that stable assembly can be performed. There is an excellent effect that maintenance such as replacement can be easily performed.
[Brief description of the drawings]
FIG. 1 is a top view of a main part showing a first embodiment of the present invention. FIG. 2 is a plan view of the entire structure. FIG. 3 is a side view of the main part seen from the rear side. FIG. 5 is a plan view showing the arrangement state of the holder. FIG. 6 is a plan view of the holder member. FIG. 7 is an operation explanatory view showing the detection voltage characteristic. FIG. 9 is a bottom view of the resistor case shown in a state where the holder is removed from the main body case. FIG. 10 is a vertical side view of the main body case. FIG. 11 is a state where the resistor case is removed. Fig. 12 is a top view of the main body case. Fig. 12 is a vertical side view of the portion indicated by the line AA in Fig. 9. Fig. 13 is an external perspective view of the cover body. Fig. 1 equivalent diagram [Fig. 16] Fig. 5 equivalent diagram [Fig. 17] Fig. 6 equivalent diagram [Explanation of symbols]
21 is a body case (body support section), 22 and 23 are detection levers, 22a and 23a are support sections, 24 is a rotating shaft, 25 is a screw, 26 is a torsion coil spring, 27 and 28 are variable resistors, and 29 is movable. Contacts, 30 is a right holder (movable contact member), 31 is a resistor plate, 31a is a resistive film, 31b is a conductor film, 32 is a left holder (movable contact member), 33 is a holder member (movable contact plate), 33a Is a right projection, 33b is a left projection, 34, 35, and 36 are electrode terminals, 37 is a resistor case (case), 38 is a cover (cover body), 39 is a screw, and 45 is an O-ring.

Claims (2)

In the state of traveling along the direction of planting of the cereals, the position of the left and right cereals is detected by the rotation angle of a pair of detection levers corresponding to the left and right during traveling between the stalks, and the traveling position is detected. In the strip running position detecting device as described above,
A main body support portion that supports the base end portions of the pair of detection levers so as to be rotatable at positions that are symmetrical with respect to the traveling direction;
A pair of variable provided with a movable contact member provided on the main body support portion corresponding to each of the pair of detection levers, and a movable contact member rotating with the rotation of the movable contact member and a movable contact of the movable contact member sliding. A resistor,
The pair of variable resistors are arranged side by side, the resistors are arranged in a symmetrical position, and the right and left movable contact members are arranged in a symmetrical position. The movable contact member is formed by using a movable contact plate formed in a common shape for right and left use, wherein the fixed member for attaching the movable contact has a right attachment portion and a left attachment portion. A straddle travel position detecting device characterized by the above. A case for holding a resistor of the pair of variable resistors;
The resistor is fixed to the case with the resistor disposed in the case, and is fixed to the case by pressing the peripheral edge with the surface on which the movable contact slides exposed. The strut travel position detecting device according to claim 1 , further comprising a cover body .

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