combine

Abstract

To provide a combine in which an interference between an upper part of a reaping device and a protective cover is prevented, thus allowing an easy maintenance of the reaping device.SOLUTION: A reaping device (3) is formed of: a lifting device (21) for lifting grain culm on a field; a reap blade device (22) for reaping a base of the grain culm; and a conveyer device (23) for conveying the reaped culm to a thresher device (4). A first transmission cylinder (14) is provided extending in a right-left direction on an upper side of the lifting device (21), the cylinder including rotational shaft therein that transmits an output rotation of an engine. A protective cover (16) covering an upper part of the lifting device (21) is provided on a front side of a first transmission cylinder (14). The device is configured to switch between a work posture in which a lower part of the protective cover (16) covers an upper part of the lifting device (21), and a waiting posture in which the lower part of the protective cover (16) is away from the upper part of the lifting device (21).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a combine harvester having a protective cover attached to an upper portion of a lifting device for a harvesting device. [Background technology]

[0002] In order to perform maintenance on the lifting device for the harvesting machine and the transport device, a technique has been known in which the lower part of the lifting device is lifted upward around a transmission tube that has a rotating shaft inside that transmits the output rotation of the engine to the lifting device (see Patent Document 1).

[0003] Also, in order to perform maintenance on the lifting device of the harvesting machine or the transport device, a technique has been known in which the upper part of the lifting device is pulled out forward from a transmission tube that houses a rotating shaft that transmits the output rotation of the engine to the lifting device (see Patent Document 2).

[0004] Furthermore, in order to perform maintenance on the lifting device of the harvesting machine and the transport device, a technique has been known in which the lifting device is moved left and right along a transmission tube that houses a rotating shaft that transmits the output rotation of the engine to the lifting device (see Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-37441 A [Patent Document 2] JP 2012-29568 A [Patent Document 3] JP 2013-9611 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the technique of Patent Document 1, when the lower part of the lifting device is lifted upward, there is a risk that the upper part of the lifting device and the protective cover covering the upper part of the lifting device may interfere with each other.

[0007] Furthermore, in the technique of Patent Document 2, when the upper part of the lifting device is pulled out forward, there is a risk that the upper part of the lifting device and the protective cover covering the upper part of the lifting device may interfere with each other.

[0008] Furthermore, even with the technology of Patent Document 3, when the lifting device is moved in the left-right direction, there is a risk of interference due to friction between the upper part of the lifting device and the protective cover covering the upper part of the lifting device.

[0009] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, a primary object of the present invention is to provide a combine harvester that prevents interference between the upper part of the harvesting device and a protective cover and allows easy maintenance of the harvesting device. [Means for solving the problem]

[0010] The present invention which has solved the above problems is as follows. That is, the invention described in claim 1 is a combine harvester in which a harvesting device (3) is provided in front of a machine frame (1) on which an engine is mounted, and a threshing device (4) is provided on the rear left side of the harvesting device (3), The reaping device (3) is formed of a lifting device (21) that lifts the culms in the field, a cutting blade device (22) that cuts the base of the culms, and a transport device (23) that transports the harvested culms toward a threshing device (4). A first transmission tube (14) is provided above the lifting device (21) in the left-right direction and extends therethrough. A protective cover (16) that covers an upper portion of the lifting device (21) is provided in front of the first transmission tube (14). The lower portion of the protective cover (16) is configured to be movable between a working position in which the lower portion of the protective cover (16) covers the upper portion of the lifting device (21) and a retreat position in which the lower portion of the protective cover (16) is separated from the upper portion of the lifting device (21). The protective cover (16) is rotatably supported on a support shaft (30) extending in the left-right direction provided on the first transmission cylinder (14), a guide plate (31) having an arc-shaped guide groove (32) formed at a position spaced a predetermined radius from the support shaft (30) is provided on the right portion of the support shaft (30), an operating lever (36) extending toward the right side is provided on the right portion of the protective cover (16), the operating lever (36) is inserted into the guide groove (32), and the operating lever (36) is operated from the rear portion of the guide groove (32) to the front portion to move the protective cover (16) from the working position to the waiting position, and the operating lever (36) is operated from the front portion of the guide groove (32) to the rear portion to move the protective cover (16) from the waiting position to the working position. This is a combine harvester characterized by the above.

[0011]

[0012] Claim 2The invention described in the claims further comprises a first transmission cylinder (14) and an operating lever (36) connected by a biasing means, and a locking member (37) that locks onto the guide plate (31) is provided on the right end of the operating lever (36). 1 The combine harvester described herein is

[0013] Claim 3 The invention described in the specification divides the protective cover (16) into a left protective cover (16L) whose left portion is rotatably supported on a left support shaft (40L) that is provided on the left portion of the first transmission cylinder (14) and extends in the vertical direction, and a right protective cover (16R) whose right portion is rotatably supported on a right support shaft (40R) that is provided on the right portion of the first transmission cylinder (14) and extends in the vertical direction, and the right portion of the left protective cover (16L) is pulled forward with the left support shaft (40L) as a fulcrum, and the right support shaft (40R) is pulled forward with the right support shaft (40R) as a fulcrum. 2. The combine harvester according to claim 1, wherein the left portion of the right protective cover (16R) is pulled forward using the left spindle (40L) as a fulcrum, thereby moving the left protective cover (16L) and the right protective cover (16R) from the working position to the waiting position, the right portion of the left protective cover (16L) is returned rearward using the left spindle (40L) as a fulcrum, and the left portion of the right protective cover (16R) is returned rearward using the right spindle (40R) as a fulcrum, thereby moving the left protective cover (16L) and the right protective cover (16R) from the waiting position to the working position.

[0014] Claim 4 The invention described in claim 1 is characterized in that the left and right length of the left and right protective cover (16L) and the right and left length of the right and left protective cover (16R) are formed to be the same length. 3 The combine harvester described herein is

[0015] Claim 5The invention described in the claims is as follows: the first transmission cylinder (14) and the left protective cover (16L) are connected by a left regulating member (42L), the left part of the left regulating member (42L) is rotatably supported on the left part of the first transmission cylinder (14), the right part of the left regulating member (42L) is rotatably supported on the rear part of the left protective cover (16L), the first transmission cylinder (14) and the right protective cover (16R) are connected by a right regulating member (42R), the right part of the right regulating member (42R) is rotatably supported on the right part of the first transmission cylinder (14), and the left part of the right regulating member (42R) is rotatably supported on the rear part of the right protective cover (16R). 4 The combine harvester described herein is

[0016] Claim 6 The described invention is a combine harvester as described in claim 1, in which a front-rear frame (50) extending forward is provided on an extending second transmission cylinder (12) that has a rotating shaft mounted thereon for transmitting the output rotation of the engine to the blade device (22), a rectangular fixed plate (51) is provided facing upward at the front of the front-rear frame (50), the lower part of an adjacent lifting device (21) provided in the middle in the left-right direction of the lifting device (21) is connected by a swinging part (52), a rectangular rolling plate (52A) of the swinging part (52) is rotatably supported on the fixed plate (51) via a pin (53) extending in the left-right direction, and the fixed plate (51) and the rotating plate (52A) are connected by a detachable fastening member (54). Effect of the Invention

[0017] According to the invention of claim 1, the reaping device (3) is formed of a lifting device (21) that lifts up the culms in the field, a cutting blade device (22) that cuts the base of the culms, and a transport device (23) that transports the harvested culms toward the threshing device (4). A first transmission tube (14) is provided above the lifting device (21) in the left-right direction and extends therethrough. A protective cover (16) that covers an upper portion of the lifting device (21) is provided in front of the first transmission tube (14). The lower portion of the protective cover (16) is configured to be movable between a working position in which the lower portion of the protective cover (16) covers the upper portion of the lifting device (21) and a retracted position in which the lower portion of the protective cover (16) is separated from the upper portion of the lifting device (21). The protective cover (16) is rotatably supported on a support shaft (30) extending in the left-right direction provided on the first transmission cylinder (14), a guide plate (31) having an arc-shaped guide groove (32) formed therein is provided on the right side of the support shaft (30) at a position spaced a predetermined radius from the support shaft (30), an operating lever (36) extending toward the right side is provided on the right side of the protective cover (16), the operating lever (36) is inserted into the guide groove (32), and the operating lever (36) is operated from the rear to the front of the guide groove (32) to move the protective cover (16) from the working position to the waiting position, and the operating lever (36) is operated from the front to the rear of the guide groove (32) to move the protective cover (16) from the waiting position to the working position.Therefore, interference between the upper part of the lifting device (21) and the protective cover (16) can be prevented, and maintenance of the reaping device (3) can be easily performed.

[0018] In addition, Maintenance of the harvesting implement (3) can be more easily performed by moving the protective cover (16) from the working position to the retreated position using the shaft (30) as a fulcrum.

[0019] Claim 2 According to the invention described, claims 1 In addition to the effects of the invention described above, the first transmission cylinder (14) and the operating lever (36) are connected by a biasing means, and a locking member (37) that locks onto the guide plate (31) is provided at the right end of the operating lever (36), thereby preventing the protective cover (16) from being forgotten to return from the retracted position to the working position.

[0020] Claim 3 According to the described invention, in addition to the effects of the invention described in claim 1, the protective cover (16) is divided into a left protective cover (16L) whose left portion is rotatably supported on a left support shaft (40L) extending in the vertical direction and provided on the left portion of the first transmission cylinder (14), and a right protective cover (16R) whose right portion is rotatably supported on a right support shaft (40R) extending in the vertical direction and provided on the right portion of the first transmission cylinder (14), and the right portion of the left protective cover (16L) is pulled forward with the left support shaft (40L) as a fulcrum, and the left portion of the right protective cover (16R) is pulled forward with the right support shaft (40R) as a fulcrum, so that the left protective cover (16L) and the right protective cover (16R) can be separated from each other. The protective cover (16R) is moved from the working position to the waiting position, the right part of the left protective cover (16L) is returned rearward using the left support shaft (40L) as a fulcrum, and the left part of the right protective cover (16R) is returned rearward using the right support shaft (40R) as a fulcrum, thereby moving the left protective cover (16L) and the right protective cover (16R) from the waiting position to the working position. Therefore, maintenance of the harvesting device (3) can be more easily performed by moving the left protective cover (16L) from the working position to the waiting position using the left support shaft (40L) as a fulcrum, and moving the right protective cover (16R) from the working position to the waiting position using the right support shaft (40R) as a fulcrum.

[0021] Claim 4According to the invention described, claims 3 In addition to the effects of the invention described above, the left and right lengths of the left and right protective cover (16L) and the right and left lengths of the right and left protective cover (16R) are formed to be the same, so that the space in front of the combine required to move the left and right protective covers (16L and 16R) from the working position to the sheltered position can be reduced.

[0022] Claim 5 According to the invention described, claims 4 In addition to the effects of the invention described above, the first transmission tube (14) and the left protective cover (16L) are connected with the left regulating member (42L), the left part of the left regulating member (42L) is rotatably supported on the left part of the first transmission tube (14), the right part of the left regulating member (42L) is rotatably supported on the rear part of the left protective cover (16L), the first transmission tube (14) and the right protective cover (16R) are connected with the right regulating member (42R), the right part of the right regulating member (42R) is rotatably supported on the right part of the first transmission tube (14), and the left part of the right regulating member (42R) is rotatably supported on the rear part of the right protective cover (16R), so that the left protective cover (16L) and the right protective cover (16R) can be prevented from being excessively pulled out forward of the combine.

[0023] Claim 6 According to the described invention, in addition to the effect of the invention described in claim 1, a front-rear frame (50) extending forward is provided on the extending second transmission cylinder (12) that houses a rotating shaft for transmitting the output rotation of the engine to the cutting blade device (22), a rectangular fixed plate (51) is provided facing upward at the front of the front-rear frame (50), the lower part of an adjacent lifting device (21) provided in the middle in the left-right direction of the lifting device (21) is connected by a oscillating part (52), a rectangular rotating plate (52A) of the oscillating part (52) is rotatably supported on the fixed plate (51) via a pin (53) extending in the left-right direction, and the fixed plate (51) and the rotating plate (52A) are connected by a detachable fastening member (54), so that the upper part of an adjacent lifting device (21) provided in the middle in the left-right direction can be easily pulled forward. [Brief description of the drawings]

[0024] [Figure 1] FIG. [Diagram 2] FIG. 2 is a right side view of the harvesting device of the first embodiment. [Diagram 3] FIG. 2 is a front view of the harvesting device according to the embodiment. [Figure 4] FIG. 13 is a right side view of the protective cover moved to the working position. [Diagram 5] 13 is a right side view of the protective cover moved to the standby position. FIG. [Figure 6] FIG. 4 is a front view of the operating lever of the protective cover. [Figure 7] FIG. 11 is a front view of a harvesting device according to a second embodiment, in which the left and right protective covers have been moved to the standby position. [Figure 8] 11 is a left side view showing the left protective cover moved to the retracted position; FIG. [Figure 9] 13 is a right side view showing the right protective cover moved to the standby position, in which the right protective cover has been moved to the standby position; FIG. [Figure 10] FIG. 4 is a front view of the right pivot member of the right protective cover. [Figure 11] FIG. 13 is a right side view of the right swing member of the right protective cover. [Figure 12] 13 is a left side view of a swinging part that swings an upper portion of the lifting device in the front-rear direction. FIG. [Figure 13] FIG. 4 is a front view of the lifting device with its upper portion pulled out forward. [Figure 14] FIG. 4 is a left side view of the lifting device with its upper portion pulled out forward. [Figure 15] (a) and (b) are the fixed plate, (c) and (d) are the rotating plate, and (e) and (f) are the cross-sectional view and the left side view of the pin. [Figure 16] FIG. 2 is a left side view of the feed chain of the threshing apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] As shown in Fig. 1, the combine harvester has a traveling device 2 consisting of a pair of left and right crawlers that travels on the soil surface, provided below the machine frame 1, and a reaping device 3 that harvests stalks in the field, provided in front of the machine frame 1. In addition, a thresher 4 that threshes and sorts the stalks harvested by the reaping device 3 is provided on the rear left side of the reaping device 3, and a control unit 5 on which an operator rides is provided on the rear right side of the reaping device 3.

[0026] An engine room for mounting the engine is provided below the control unit 5, and a grain tank 7 for storing the grains that have been threshed and sorted by the threshing device 4 is provided behind the control unit 5. The grains stored in the grain tank 7 are discharged to the outside by a discharge auger 8 connected to the grain tank 7.

[0027] <Reaping device of the first embodiment> As shown in Figs. 1 to 3, the reaping device 3 of the first embodiment is attached to a reaping frame 10, which serves as a main frame. The reaping frame 10 is formed of a transmission tube 11 extending in the front-rear direction, a transmission tube (referred to as a "second transmission tube" in the claims) 12 extending in the left-right direction and provided in front of the transmission tube 11, a transmission tube 13 extending in the up-down direction and provided to the left of the transmission tube 12, and a transmission tube (referred to as a "first transmission tube" in the claims) 14 extending in the left-right direction and provided on the upper part of the transmission tube 13. The rear part of the transmission tube 11 is supported so as to be swingable by a transmission tube 15 extending in the left-right direction and provided in front of the threshing device 4 to which the output rotation of the engine is transmitted, and a protective cover 16 having a longitudinal cross section formed in an arc shape in the front-rear direction is provided in front of the transmission tube 14. This allows a lifting cylinder (not shown) connected to the transmission tube 11 to be driven to lift the front part of the transmission tube 11, i.e., the lifting cylinder, to vertically lift the harvesting device 3. Note that a rotating shaft to which the output rotation of an engine or the like is transmitted is provided inside the transmission tubes 11-15.

[0028] The harvesting device 3 is composed of a dividing body 20 that divides the culms planted in the field, a raising device 21 that raises the divided culms, a cutting blade device 22 that cuts the raised culms, and a transport device 23 that clamps the cut culms and transports them to the threshing device 4.

[0029] The lifting device 21 is composed of five lifting devices 21A to 21E, and the right side of the lifting device 21B and the left side of the lifting device 21C are connected by a connecting member (not shown). This allows a total of five rows of stalks to be lifted simultaneously: two rows between the lifting devices 21A and 21B, two rows between the lifting devices 21C and 21D, and one row between the lifting devices 21D and 21E.

[0030] As shown in Figs. 4 to 6, a support shaft 30 extending to the right is provided at the right end of the transmission tube 14. A guide plate 31 is supported on the right side of the support shaft 30, and an arc-shaped guide groove 32 is formed in the guide plate 31 at a position spaced a predetermined radius from the support shaft 30. A large-diameter hole 33 having a diameter larger than the width of the guide groove 32 is formed in front of the guide groove 32. The support shaft is formed of the support shaft 30 extending to the right from the right end of the transmission tube 14 and a support shaft (not shown) extending to the left from the left end of the transmission tube 14.

[0031] An arm plate 35 extending downward is provided at the right end of the inner periphery of the protective cover 16. An upper part of the arm plate 35 is rotatably supported by the support shaft 30, and an operating lever 36 extending rightward is provided at the lower part of the arm plate 35 for moving the protective cover 16 from the working position to the retracted position and from the retracted position to the working position. A screw is formed at the right part of the operating lever 36 to which a locking member 37 such as a knob bolt can be detachably attached. The arm plate is formed of the arm plate 35 extending downward from the right end of the inner periphery of the protective cover 16 and an arm plate (not shown) extending downward from the left end of the inner periphery of the protective cover 16, and an upper part of the arm plate is rotatably supported by a support shaft extending leftward from the left end of the transmission tube 14.

[0032] The right end of the transmission cylinder 14 and the upper part of the arm plate 35 are connected by a biasing means (not shown) such as a spring. This allows the protective cover 16 to be moved from the standby position to the working position, and in the standby position, the rear surface of the lower part of the protective cover 16 can be brought into contact with the front surfaces of the upper parts of the lifting devices 21A to 21E, thereby reducing the gap between the rear surface of the lower part of the protective cover 16 and the front surfaces of the upper parts of the lifting devices 21A to 21E.

[0033] After operating the operating lever 36 from the rear to the front of the guide groove 32, the locking member 37 is engaged with the guide plate 31, the protective cover 16 is moved from the working position to the retracted position, and the lower part of the protective cover 16 is separated from the upper part of the lifting devices 21A-21E to form a predetermined gap. This makes it easy to remove stalks entangled in the lugs of the lifting devices 21A-21E by pulling out the upper parts of the lifting devices 21A-21E forward.

[0034] In addition, after disengaging the guide plate 31 from the locking member 37, the operating lever 36 can be operated from the front to the rear of the guide groove 32 to move the protective cover 16 from the retreated position to the working position, and the lower part of the protective cover 16 can be brought into close contact with the upper part of the lifting devices 21A-21E. This makes it possible to prevent straw chips and the like from entering the rear part through the gap between the upper part of the lifting devices 21A-21E and the protective cover 16 and accumulating in the transmission tube 14 and the like during harvesting work.

[0035] <Second embodiment of the reaping device> A reaping device 3 according to a second embodiment is shown in Fig. 7. The same members as those in the reaping device 3 according to the first embodiment are given the same reference numbers and their explanations are omitted.

[0036] The lifting device 21 is composed of six lifting devices 21A to 21F, and the right side of the lifting device 21B and the left side of the lifting device 21C are connected by a connecting member (not shown), and the right side of the lifting device 21D and the left side of the lifting device 21E are connected by a connecting member (not shown). This allows a total of six rows of stalks to be lifted simultaneously: two rows between the lifting devices 21A and 21B, two rows between the lifting devices 21C and 21D, and two rows between the lifting devices 21E and 21F.

[0037] As shown in Figs. 8 to 11, a protective cover 16 is provided on the front side of the transmission tube 14. The protective cover 16 is divided into two in the left-right direction, a left protective cover 16L and a right protective cover 16R. The left part of the left protective cover 16L is fixed to the front of a left swinging member 41L rotatably supported by a left support shaft 40L extending in the vertical direction and provided on the front of the left end of the transmission tube 14. The right part of the right protective cover 16R is fixed to the front of a right swinging member 41R rotatably supported by a right support shaft 40R extending in the vertical direction and provided on the front of the right end of the transmission tube 14.

[0038] The right part of the left protective cover 16L can be pulled forward around the left support shaft 40L via the left swinging member 41L, and the left part of the right protective cover 16R can be pulled forward around the right support shaft 40R via the right swinging member 41R, to separate the lower parts of the left protective cover 16L and the right protective cover 16R from the upper parts of the lifting devices 21A-21F. This makes it easy to remove stalks entangled in the lugs of the lifting devices 21A-21F by pulling out the upper parts of the lifting devices 21A-21F forward.

[0039] The right part of the left protective cover 16L can be moved rearward around the left support shaft 40L via the left swinging member 41L, and the left part of the right protective cover 16R can be moved rearward around the right support shaft 40R via the right swinging member 41R, so that the lower parts of the left protective cover 16L and the right protective cover 16R can be brought into close contact with the upper parts of the lifting devices 21A to 21F. This makes it possible to prevent straw chips and the like from entering the rear part through the gaps between the upper parts of the lifting devices 21A to 21F and the left protective cover 16L and right protective cover 16R and accumulating in the transmission tube 14 and the like during harvesting work.

[0040] The left part of the transmission tube 14 and the inner periphery of the left protective cover 16L are connected by a left regulating member 42L that regulates the forward pull-out range to a predetermined range. The right part of the transmission tube 14 and the inner periphery of the right protective cover 16R are connected by a right regulating member 42R that regulates the forward pull-out range to a predetermined range. This regulates the range in which the right part of the left protective cover 16L is pulled forward around the left support shaft 40L via the left swinging member 41L, and the left part of the right protective cover 16R is pulled forward around the right support shaft 40R via the right swinging member 41R, so that collision with external trees or the like can be prevented. The two ends of the left regulating member 42L are rotatably supported by the left part of the transmission tube 14 and the inner periphery of the left protective cover 16L, respectively, and the two ends of the right regulating member 42R are rotatably supported by the right part of the transmission tube 14 and the inner periphery of the right protective cover 16R, respectively.

[0041] Although the left protective cover 16L and the right protective cover 16R shown in FIG. 7 are formed to have the same length in the left-right direction, the left protective cover 16L may be formed to have a longer length in the left-right direction than the right protective cover 16R in the left-right direction, or the left protective cover 16L may be formed to have a shorter length in the left-right direction than the right protective cover 16R in the left-right direction.

[0042] The protective cover 16 may also be divided into three parts in the left-right direction. In this case, a middle protective cover (not shown) located between the left protective cover 16L and the right protective cover 16R is detachably attached to the transmission tube 14 by fastening means such as bolts.

[0043] <Oscillating parts> As shown in Fig. 12, in the case of the harvesting device 3 of the first embodiment, a front-rear frame 50 extending forward is provided at a portion of the transmission tube 12 located at the rear midway between the lifting devices 21B, 21C in the left-right direction. A pair of left and right substantially rectangular fixing plates 51 are erected facing upward on the front side of the front-rear frame 50. Note that in the case of the harvesting device 3 of the second embodiment, front-rear frames 50 extending forward are provided at portions of the transmission tube 12 located at the rear midway between the lifting devices 21B, 21C in the left-right direction and at the rear midway between the lifting devices 21D, 21E in the left-right direction, respectively.

[0044] A swinging part 52 is rotatably supported on the front part of the fixed plate 51. The swinging part 52 is formed of a rectangular rotating plate 52A provided between the pair of left and right fixed plates 51, an extending part 52B extending from the top of the rotating plate 52A toward the rear and upward, and a connecting part 52C extending in the left-right direction from the rear part of the extending part 52B. The left part of the connecting part 52C is connected to the lower part of the rear surface of the lifting device 21B, and the right part of the connecting part 52C is connected to the lower part of the rear surface of the lifting device 21C.

[0045] A pin 53 is inserted through an opening 51a formed in the front lower part of the fixed plate 51 and an opening 52a formed in the front lower part of the rotating plate 52A, and a fastening member 54 such as a bolt is inserted through a screw portion 51b formed in the rear part of the fixed plate 51 and an opening 52b formed in the rear part of the rotating plate 52A. As a result, as shown in Figures 13 and 14, when the upper parts of the lifting devices 21B, 21C are pulled forward, the fastening member 54 is removed and the swinging part 52 is rotated counterclockwise around the pin 53, so that the upper parts of the lifting devices 21B, 21C are pulled forward to form a large working space in front of the conveying device 23, and the work of removing the stalks stuck in the conveying device 23 can be performed efficiently.

[0046] The pin 53 may be a straight pin, a stepped pin, an L-shaped pin with a bent portion formed on one side of the straight pin, or the like. When a straight pin is used, it is preferable to form through holes at both ends of the straight pin and insert a snap pin or a split pin therethrough. When a stepped pin is used, it is preferable to form a counterbore on the side of the fixed plate 51 into which the stepped portion of the stepped pin enters, and to form a through hole on the other side where the stepped portion of the stepped pin is not formed, and to insert a snap pin or a split pin therethrough. When an L-shaped pin is used, it is preferable to provide an engagement portion (not shown) on the side of the fixed plate 51 with which the bent portion of the L-shaped pin engages, and to form a through hole on the other side where the bent portion of the L-shaped pin is not formed, and to insert a snap pin or a split pin therethrough. This makes it possible to prevent the pin 53 from falling off the openings 51a and 52a of the fixed plate 51 and the rotating plate 52A.

[0047] 15(a) and (b), protrusions 53a protruding in the radial direction can be formed at both ends of the pin 53. When using this pin 53, a groove 52c extending in the radial direction into which the protrusion 53a is inserted is formed in the opening 52a of the rotating plate 52A as shown in FIG. 15(c) and (d), and a groove 51c extending in the radial direction into which the protrusion 53a is inserted is formed in the opening 51a of the fixed plate 51 as shown in FIG. 15(e) and (f). This makes it possible to easily fix the pin 53 by rotating the pin 53 around the axis after the pin 53 is inserted through the opening 51a of the fixed plate 51 and the opening 52a of the rotating plate 52A.

[0048] <Feed chain drive sprocket> As shown in Figure 16, the drive sprocket 61, which transmits the output rotation of the engine to the feed chain 60 that transports the stalks from the front to the rear of the threshing device 4, is provided above a counter shaft 62 extending in the left-right direction that transmits the output rotation of the engine to the threshing device 4, which is provided in front of the front wall of the threshing device 4. In addition, an oil supply guard 63 that supplies oil to the feed chain 60, etc. is provided between the drive sprocket 61 and the counter shaft 62 in the vertical direction. This makes it possible to effectively utilize the space formed in the front part of the threshing device 4. In addition, a tension roller 64 that adjusts the tension of the feed chain 60 is provided in front of the drive sprocket 61. [Explanation of symbols]

[0049] 1 Aircraft frame 3 Reaping device 4. Threshing equipment 12 Transmission Cylinder (Second Transmission Cylinder) 14 Transmission Cylinder (First Transmission Cylinder) 16 Protective cover 16L Left protective cover 16R Right protective cover 21 Raising device 22 Cutting blade device 23 Transport equipment 30 Spindle 31 Guide plate 32 Guide groove 36 Operating lever 37 Locking member 40L left support shaft 40R right support shaft 42L Left restriction member 42R Right regulating member 50 Front and rear frames 51 Fixing plate 52 Swinging parts 52A Rotating Plate 53 Pin 54 Fastening members

Claims

1. A combine harvester having a harvesting device (3) provided at the front of a machine frame (1) on which an engine is mounted, and a threshing device (4) provided at the rear left side of the harvesting device (3), The reaping device (3) is formed of a raising device (21) for raising the culms in the field, a cutting blade device (22) for reaping the base of the culms, and a conveying device (23) for conveying the reaped culms toward a threshing device (4), A first transmission cylinder (14) is provided above the lifting device (21) in the left-right direction and extends in the left-right direction, and the first transmission cylinder (14) has a rotary shaft therein for transmitting the output rotation of the engine. A protective cover (16) for covering an upper portion of the lifting device (21) is provided on the front side of the first transmission cylinder (14); The lower part of the protective cover (16) is configured to be movable between a working position in which the lower part of the protective cover (16) covers an upper part of the lifting device (21) and a retreat position in which the lower part of the protective cover (16) is separated from the upper part of the lifting device (21), The protective cover (16) is rotatably supported on a support shaft (30) extending in the left-right direction and provided on the first transmission cylinder (14), a guide plate (31) having an arc-shaped guide groove (32) formed at a position spaced a predetermined radius from the support shaft (30) on the right side of the support shaft (30); An operating lever (36) is provided on the right side of the protective cover (16) and extends rightward. An operating lever (36) is inserted into the guide groove (32), A combine harvester characterized in that the operating lever (36) is operated from the rear to the front of the guide groove (32) to move the protective cover (16) from a working position to a waiting position, and the operating lever (36) is operated from the front to the rear of the guide groove (32) to move the protective cover (16) from the waiting position to the working position.

2. 2. A combine harvester according to claim 1, wherein the first transmission cylinder (14) and an operating lever (36) are connected by a biasing means, and a locking member (37) that locks onto the guide plate (31) is provided on the right end of the operating lever (36).

3. The protective cover (16) is divided into a left protective cover (16L) whose left part is rotatably supported on a left support shaft (40L) extending in the vertical direction and provided on the left part of the first transmission cylinder (14), and a right protective cover (16R) whose right part is rotatably supported on a right support shaft (40R) extending in the vertical direction and provided on the right part of the first transmission cylinder (14), 2. The combine harvester according to claim 1, wherein the right part of the left protective cover (16L) is pulled forward using the left support shaft (40L) as a fulcrum, the left part of the right protective cover (16R) is pulled forward using the right support shaft (40R) as a fulcrum, the left protective cover (16L) and the right protective cover (16R) are moved from the working position to the waiting position, the right part of the left protective cover (16L) is returned rearward using the left support shaft (40L) as a fulcrum, and the left part of the right protective cover (16R) is returned rearward using the right support shaft (40R) as a fulcrum, and the left protective cover (16L) and the right protective cover (16R) are moved from the waiting position to the working position.

4. 4. The combine harvester according to claim 3, wherein the left protective cover (16L) and the right protective cover (16R) have the same length in the left-right direction.

5. The first transmission cylinder (14) and the left protective cover (16L) are connected by a left regulating member (42L), a left portion of the left regulating member (42L) is rotatably supported on a left portion of the first transmission cylinder (14), and a right portion of the left regulating member (42L) is rotatably supported on a rear portion of the left protective cover (16L), 5. A combine harvester as described in claim 4, wherein the first transmission cylinder (14) and the right protective cover (16R) are connected by a right regulating member (42R), the right portion of the right regulating member (42R) is rotatably supported on the right portion of the first transmission cylinder (14), and the left portion of the right regulating member (42R) is rotatably supported on the rear portion of the right protective cover (16R).

6. A front-rear frame (50) extending forward is provided on a second transmission cylinder (12) that has a rotary shaft mounted therein for transmitting the output rotation of the engine to the cutting blade device (22); A rectangular fixing plate (51) is provided on the front part of the front and rear frame (50) facing upward, The lower parts of adjacent lifting devices (21) provided in the middle of the left-right direction of the lifting devices (21) are connected by a swinging part (52), A rectangular rotating plate (52A) of a swinging part (52) is rotatably supported on the fixed plate (51) via a pin (53) extending in the left-right direction, 2. The combine harvester according to claim 1, wherein the fixed plate (51) and the rotating plate (52A) are connected by a detachable fastening member (54).

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