JPH0514744Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention allows manual and automatic operation to adjust the handling depth when, for example, harvested grain culms are placed in a handling chamber for handling. It relates to a structure for adjusting the position of a working device that is configured to be switchable, and more specifically, it fixes an engaging member for following a working device adjusting lever whose swing can be adjusted by manual operation force, and also fixes the engaging member for following the lever. By swinging in a direction orthogonal to the swinging direction, the engaging member is brought into an automatic operating state in which it engages with a driving gear linked to an actuator that serves as a drive source during automatic position control of the working device, and in an unengaged state. The present invention relates to a position adjustment structure for a working device configured to be switchable between a manual operation state and a manual operation state.

[Conventional technology]

Regarding the position adjustment structure of this type of work equipment,
When the work equipment is put into automatic operation mode, the actuator drives and swings the work equipment adjustment lever with considerable force, so if the lever reaches its mechanical swing limit position, the drive system including the actuator will be damaged. Alternatively, an excessive load may be placed on the electrical system, leading to the risk of damage or heat generation. For this reason, many devices are equipped with a limit switch to check the operation of the actuator just before the mechanical swing limit position of the lever, and when the lever approaches the mechanical swing limit position, this limit switch is pushed and operated to stop the actuator. I made it.

[Problem that the invention attempts to solve]

However, with this conventional configuration, it is difficult to finely adjust the mounting position of the limit switch because it comes into direct contact with the operating piece of the limit switch. There is a risk that the limit switch may be damaged by coming into contact with it, and improvements have long been sought.

In view of these circumstances, the present invention aims to protect the limit switch from collision with the lever and increase its durability.

[Means for solving problems]

The characteristic configuration of the present invention, which has been made to achieve the above object, is that a contact piece pressed by the working device adjustment lever is placed in a position just before the mechanical swing limit of the lever in an automatic operation state over a certain range. In addition to being swingable, a limit switch for checking the operation of the actuator, which is operated in contact with the contact piece, is provided on the fixed bracket to which the contact piece is attached, and its functions and effects are as follows. It is.

[Effect]

That is, when the lever for adjusting the working device in the automatically operated state is driven to swing and reaches the mechanical swing limit position, it presses the contact piece. As a result, this contact piece swings to contact and operate a limit switch provided on the fixed bracket for checking the operation of the actuator.

[Effect of idea]

Therefore, according to the present invention, even if the lever reaches its mechanical swing limit position, the force acting on the lever is weakened through contact and transmitted to the limit switch, thereby preventing damage to the limit switch due to collision of the lever. It is now possible to protect the product from damage and increase its durability.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 7, a pre-processing section is equipped with a lifting device 1 that acts on the planted grain culm, a reaping device 2, and a vertical conveyance device 3, which is an example of a working device that conveys the reaped grain culm to the rear of the machine. , a crawler traveling device 4, a threshing section 5, a control section 6, etc. are provided at the front of a traveling body to constitute a combine harvester.

As shown in FIG. 5, the vertical conveyance device 3 is composed of a clamping conveyance device 7 that acts on the stock side of the harvested grain culm and a locking conveyance device 8 that acts on the ear side. The structure is such that the grain culms are taken over in an upright position, lifted up and conveyed to the rear of the machine, changed to a sideways position at the end of the conveyance, and then fed to the starting end of the threshing feed chain 9. Then, the rear end side of the vertical conveyance device frame 10 is connected to the preprocessing section frame 11 so as to rotate around the axis P ₁ , and the front end side is connected to the preprocessing section frame 11 via the bending/extending link mechanism 12. They are connected to each other, and the clamping and conveying device 7 is configured to swing together with the locking and conveying device 8 in the direction of the grain culm to be conveyed around the axis _P1 on the conveyance end side. In other words, due to the above-mentioned rocking of the clamping and conveying device 7, the position at which the clamping and conveying device 7 clamps the harvested grain culm when it takes over changes toward the culm, and the grain is inserted into the handling chamber (not shown) in the threshing section 5. The length of the culm, or the depth of handling, is made to vary.

Pre-processing section frame 1 of the bending/extending link mechanism 12
An operating lever 13 for swinging the clamping and conveying device 7 is attached to the link 12a on the first side, and a rack gear 14, which is an example of a driven engagement member, is fixed to the lever 13. Then, as shown in Fig. 4, the lever shaft center is attached to this rack gear 14.
P Drive pinion gear 1 that engages from _two directions
5 is an electric motor support member 16, and the operation lever 1 is
It is attached to the preprocessing section frame 11 through a lever guide 17 that acts on the lever guide 17 and a lever guide column 18, and is rotated in the forward rotation direction and reverse rotation direction in conjunction with an electric motor 19, which is a type of actuator. It is designed so that it will be done. That is, the electric motor 19 moves the operating lever 13 to the axis P ₂
The gripping and conveying device 7 is automatically oscillated by swinging around the . When the operating lever 13 is swung around an axis P ₃ that is substantially orthogonal to the axis P ₂ , the rack gear 14 is disengaged from the pinion gear 15 , and the rack gear 14 disengages from the pinion gear 15 . The operating lever 13 is biased to swing by a spring 20 toward the side that engages with the shaft, and the operating lever 13 swings around the axis _P2 while maintaining the state in which the rack gear 14 is separated from the pinion gear 15. By operating the link 12a, the link 12a swings to switch to manual operation of the clamping and conveying device 7.

As shown in FIGS. 1 to 3, fixing brackets 27, 27 are bolted and fixed to the back surfaces of both front and rear ends of the guide surface 17a of the lever guide 17 so as to be movable and adjustable along the guide direction. , 27, contact pieces 28, 28 made of resin and having a U-shaped cross section are attached to the operating lever 13.
The operating lever 13 is pivotably supported around axes P _{4 and} P ₄ parallel to the lever axis P 3 , and when the operating lever 13 reaches just before the mechanical swing limit position, the contact attached to the lever 13 is The contact plate 29 is configured to press the contact piece 28. Further, a protrusion 28a is formed on the inside of this contact piece 28, and when the contact piece 28 is pressed and swings a certain amount, this protrusion 28a hits the fixed bracket 27 and the swing is restricted. .

Furthermore, a box-shaped limit switch is installed at the lower end of the fixed bracket 27 to check the operation of the actuator.
While the SW is fixed with screws, the operating piece 30 made of a spring plate provided on the limit switch SW is brought into contact with the inner surface of the contact piece 28, and when the contact piece 28 is pressed by the operating lever 13 and swings, this operation can be performed. When the piece 30 is energized, the limit switch SW outputs a detection signal. In addition, the contact piece 3
0 is pressed against the contact plate 29 at its tip,
Since the structure is such that the operating piece 30 is pressed at the intermediate portion, the amount of pressure on the operating piece 30 can be slightly changed by adjusting the movement of the fixed bracket 27 along the guide. Furthermore, before the operation piece 30 is urged to the limit position, the contact piece 2
8 is regulated by the protrusion 28a, the operating piece 30 and the limit switch SW do not need to be directly subjected to force from the operating lever 13 even when the operating lever 13 reaches its mechanical swing limit position. Therefore, it is designed to avoid damage.

As shown in FIG. 6, a pair of oscillating first sensors 21a, 21b that contact and act on the grain culm transported by the vertical transport device 3 are arranged in parallel in the culm direction of the transported grain culm. In this state, the conveyance guide rod 8a of the locking conveyance device 8 is
It is attached to the support frame 23 of each grain culm holding rail of the clamping and conveying device 7, and is configured to detect the handling depth by detecting the position of the ear tip of the grain culm to be conveyed with respect to the clamping and conveying device 7. . That is, when only the first sensor 21a on the plant side of the pair of first sensors 21a, 21b comes into contact, the length of the culm from the point where it is clamped by the clamping and conveying device 7 to the tip of the stalk is within the set range of handling depth. If both of the pair of first sensors 21a and 21b come into contact, it is determined that the culm length is such that the handling depth exceeds the set range, and the pair of first sensors 21a , 21b are not in contact with each other, it is determined that the culm length is such that the handling depth exceeds the set range and becomes shallow.

A pair of first sensors 21a, 21
A first switch 24a or 24b that electrically outputs the detection result of each of b to each column is connected to the drive circuit of the electric motor 19 via a handling depth control mechanism (not shown), and the vertical conveyance device A second switch section 26 for electrically taking out the detection result of the second sensor 25 for detecting the presence of grain culms in No. 3 is linked to the handling depth control mechanism. The handling depth control mechanism automatically enters a state in which control operation is possible when the second sensor 25 is in a detection state, and also enters a state in which it is detected that the handling depth falls within a set range. Automatic control of the electric motor 19 is performed by automatically outputting a predetermined signal to the drive circuit based on information from the pair of first sensors 21a and 21b so that the pair of first sensors 21a and 21b It is configured to do so. Furthermore, if the detection state of the second sensor 25 and the detection state or non-detection state of both first sensors 21a and 21b continue due to the reaped grain culm being too long or too short, or false detection may occur. In this case, when the electric motor 19 continues to be driven only in one direction and the operating lever 13 approaches the swing limit position, the limit switches SW detect this and stop the electric motor 19 from driving any further. It is designed to do so.

In short, when the harvested grain culm is supplied to the vertical conveyance device 3, the handling depth can be automatically controlled, and the handling depth can be maintained almost constant regardless of changes in the culm height of the harvested grain culm. By switching and operating the operating lever 13 to the state where the interlocking with respect to the electric motor 19 is released as necessary,
It is possible to artificially adjust the depth of treatment.

Note that although numbers are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the working device position adjustment structure according to the present invention, and FIG. 1 shows the state in which the working device adjusting lever and the contact piece are in contact with each other, and FIG. 2 shows the working device adjusting lever and the contact piece. FIG. 3 is a plan view of the contact piece, FIG. 4 is a plan view of the working device adjustment lever, FIG. 5 is a side view of the working device, and FIG. 6 is a diagram showing the state of contact with one contact piece. Diagram showing how the sensor is installed,
Figure 7 is a side view of the front of the combine. 3... Working device, 13... Lever for adjusting working device, 14... Engaging member, 15... Gear, 19...
...Actuator, 27...Fixed bracket, 2
8...Contact piece, SW...Limit switch.

Claims (1)

[Claims for Utility Model Registration] A working device adjustment lever 13 whose swing can be adjusted by human operating force is fixed with a driven engagement member 14, and the lever 13 is moved in a direction orthogonal to the swing direction. By swinging, the engaging member 1
4 is configured to be switchable between an automatic operation state in which it engages a drive gear 15 linked to an actuator 19 serving as a drive source during automatic position control of the work device 3, and a manual operation state in which the engagement is released. In the position adjustment structure, a contact piece 28 that is pressed by the working device adjustment lever 13 is provided at a position just before the mechanical swing limit of the lever 13 in an automatically operated state, and is swingable over a certain range; A position adjustment structure for a working device in which a limit switch SW for checking the actuator operation, which is operated by contacting the contact piece 28, is provided on a fixed bracket 27 to which the contact piece 28 is attached. The position adjustment structure for a working device according to claim 1, wherein the contact piece 28 has a substantially U-shaped cross section.