JP2001238523A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combine harvester capable of reducing the generation of the part or the like remaining to be threshed by carrying out the deliver of grain culms between a conveying device and a threshing feed chain in a good state even if the condition of the crops is different, e.g. in the case of the crops with shortly reaped grain culms. SOLUTION: This combine harvester has a reaping device 7 for reaping the plant foots of planted grain culms, a conveying device 9 for conveying the reaped grain culms while nipping the plant foot-sides of the reaped grain culms and engaging with the ear tip sides of the reaped grain culms, and a threshing feed chain 17 for conveying the grain culms delivered from the conveying device 9 in a state in which the plant foot sides are nipped and the ear tip sides are inserted into the interior of the threshing chamber of the threshing device so as to be threshed, and is constituted so that the conveying speed of the threshing feed chain 17 based on the conveying speed of the conveying device 9 may be freely changed and regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaping device for cutting a root of a planted cereal culm, a state in which the pedestal side of the cereal culm is clamped, and the tip side of the harvested cereal culm is locked. In a state where the conveying device for conveying toward the threshing device and the root side of the harvested cereal culm delivered from the conveying device are sandwiched, the spike tip side is inserted into the handling chamber of the threshing device and is processed. The present invention relates to a combine provided with a threshing feed chain to be conveyed.

[0002]

2. Description of the Related Art Conventionally, in a combine having the above structure, as disclosed in, for example, Japanese Patent Laid-Open No. 5-22, the transfer speed of a threshing feed chain can be changed and adjusted in a transmission mechanism from an engine to the threshing feed chain. A transmission is provided, and a target value of the transport speed of the threshing feed chain is set so as to increase as the grain culm supply amount increases, and a control device for automatically controlling the operation of the transmission is detected by a vehicle speed sensor. The operation of the transmission is controlled such that the culm supply amount supplied to the handling room is determined based on the vehicle speed, and the transport speed of the threshing feed chain becomes a target value corresponding to the determined cereal culm supply amount. There was one configured as follows. Although not shown in the above publication, the transport speed of the transport device that transports the harvested culm varies in synchronization with the vehicle speed so that the higher the vehicle speed, the higher the vehicle speed in order to properly perform the transport process. In order to achieve this, it is configured to be driven by the power after shifting of the vehicle body transmission.

[0003]

In the above-mentioned conventional structure, a change in the amount of grain supply per unit time to the handling room, which changes in accordance with a change in vehicle speed, is determined, and the change in the amount of grain supply per unit time is determined. In addition, the configuration is such that the transport speed of the threshing feed chain is automatically adjusted so that the larger the culm supply amount, the smaller the occurrence of threshing defects. In addition, for example, if the transport speed of the threshing feed chain is always constant, if the vehicle speed, that is, the grain culm supply amount is large, the layer thickness of the grain culm transported by the threshing feed chain will be large enough. There is a possibility that the handling process is not performed or there is a possibility that sari grains may occur, and conversely, when the vehicle speed, that is, the supply amount of the cereal stalk becomes small, the monogranulation due to the rubbing between the processed products in the handling room is insufficient. For example, as described above, as the configuration for automatically adjusting the conveying speed of the threshing feed chain so as to increase as the supply of cereal culm increases, as described above, This is to reduce the occurrence of poor threshing.

[0004] However, in the above-mentioned conventional configuration,
There is a possibility that problems may occur in the following aspects, and there is room for improvement. That is, in the conventional configuration, according to a change in the vehicle speed, the transport speed of the transport device and the transport speed of the threshing feed chain are each set to a value determined by a preset condition so that the transport speed increases as the vehicle speed increases. It will be adjusted automatically. In other words, when the vehicle speed is set to a certain value, the transfer speed of the transfer device and the transfer speed of the threshing feed chain are always adjusted to constant values based on preset change characteristics. As a result, when the transport speed of the transport device is set to a certain value, the transport speed of the threshing feed chain always has the same value.

[0005] By the way, the crops to be harvested are not always in the same condition. For example, when the length of the harvested culm is shorter than a standard length, the transporting device pinches and transports the crops. The stem side of the harvested grain culm is pinched and transported, so it is surely transported at the transport speed by the transport device and delivered to the threshing feed chain, but the harvested grain on which the kernels are settled Since the culm tip is conveyed in a locked state, when the culm is transferred to the threshing feed chain, the locking state by the conveying device is engaged earlier on the front side of the conveyer than on a standard length cereal culm. The stop is released, and the delivery to the threshing feed chain may be slightly delayed compared to the stock source side (for example, refer to the transport posture indicated by K2 in FIG. 8). Then, when the root side of the threshing feed chain is nipped and the spike side is transported in a state where the spike side is inserted into the handling room of the threshing device and handled and processed, the root side is conveyed in a state preceding the spike side. However, if the handling process is performed with the transport posture of the harvested grain culm in the leading state of the stock in this way, there is a disadvantage that there is a great possibility that unhandled processing occurs in the handling process in the handling room.

However, according to the above-mentioned conventional configuration, since the transport speed of the transport device and the transport speed of the threshing feed chain always have the same relationship, crop conditions such as the length of the cut culm as described above are different. When the grain culm is transferred between the conveying device and the threshing feed chain, there is a problem that the culm posture becomes the leading position of the stock and there is a high possibility that unhandled residue is generated.

The present invention has been made in view of such a point, and an object of the present invention is to provide a transfer device and a threshing feed chain even when the crop conditions are different, such as when the harvested culm is short. It is an object of the present invention to provide a combine which enables the transfer between devices to be performed in a good condition and reduces the occurrence of unhandled portions.

[0008]

According to a first aspect of the present invention, there is provided a reaping device for cutting a root of a planted cereal culm, a nipping side of the cultivated cereal culm, and a reaper. A transporting device for transporting the culm to the threshing apparatus with the tip of the culm locked, and a clipping side of the harvested cereal culm delivered from the transporting device sandwiched between the stem sides of the culm and the inside of the handling room of the threshing apparatus And a threshing feed chain configured to be inserted into the threshing feed chain and transported in a state where the threshing feed chain is transported in a state where the threshing feed chain is transported in a state of being handled. .

[0009] For example, if the transfer of the harvested grain culm on the tip side by the transfer device is properly performed until it is delivered to the threshing feed chain and the above-mentioned delay on the tip side does not occur, the transfer device is used. It is possible to make the transfer speed of the threshing feed chain substantially the same as the transfer speed of the threshing feed chain so that the delivery can be performed smoothly. In addition, the length of the harvested grain culm is short, and the locking and transport of the harvested grain culm on the tip side by the transport device is released earlier, so that at the transfer point from the transport device to the threshing device, the tip of the harvested grain culm is shorter than the stock side. Side is slightly delayed (for example, the transport posture indicated by K2 in FIG. 8)
In such a case, by changing the conveying speed of the threshing feed chain to the low speed side with respect to the conveying speed of the conveying device by the speed changing means, the conveying speed of the stock chain side of the feed chain side at the transfer point is slightly reduced. It becomes late, and an appropriate posture (for example, K1 in FIG.
(See the transfer posture shown in FIG. 2) in the handling room of the threshing apparatus, it is possible to reduce the occurrence of unhandled material.

Therefore, even when the crop conditions are different, such as when the harvested culm is short, the delivery between the transporting device and the threshing feed chain is performed in a good condition, and the unhandled portion is generated. Can be provided.

[0011] According to the characteristic configuration of the second aspect, in the first aspect, the transport device and the threshing feed chain each have a speed such that the transport speed increases as the vehicle speed increases. It is configured to change.

[0012] The amount of cereal culm supplied per unit time supplied to the threshing apparatus mainly changes depending on the cutting operation speed during the cutting operation, that is, the vehicle speed. Are changed so that the higher the vehicle speed, the higher the transport speed of each.
Regardless of the change in the vehicle speed, the transport amount per unit time of the harvested grain culm transported by the transport device, and the transport amount per unit time of the harvested grain culm by the threshing feed chain,
It will always be kept the same or almost the same.

As a result, regardless of the change in the vehicle speed, the transport amount of the harvested culm per unit time in the transport device is always:
Since the same or substantially the same state is maintained, the transport speed of the harvested grain culm becomes slower with respect to the vehicle speed,
The transport speed is faster than the vehicle speed, and there is no disadvantage such as forcing the stems and stems planted in the field to be forcibly cut off, and the proper transport state can be maintained.

Further, if the vehicle speed is high, the conveying speed of the threshing feed chain is high, so that the action of kneading the threshing processed material in the handling room is not excessive, and an appropriate state is avoided, thereby avoiding the generation of sari grains and the like. In other words, if the vehicle speed is low, single-graining can be promoted by increasing the residence time of the thresh-treated product in the handling room against the decrease in the rubbing action due to the decrease in the supply of grain culm. Thus, the performance of the threshing process can be improved, and suitable means for carrying out claim 1 can be obtained.

According to a third aspect of the present invention, in the first or second aspect, the speed changing means is configured to be capable of changing and adjusting the conveying speed of the threshing feed chain to a plurality of stages within a set range. I have.

Since the transport speed of the threshing feed chain can be changed and adjusted in a plurality of stages, the transport speed of the threshing feed chain can be adjusted more finely in response to the difference in crop conditions, so that the transport speed can be adjusted more appropriately to the crop conditions. Thus, the harvested culm can be transported, and it is possible to reduce the occurrence of unhandled stalks and the like, and it is possible to obtain means suitable for carrying out claim 1 or 2.

According to a fourth feature of the present invention, in any one of the first to third features, a manual operation for setting a target value of the conveying speed of the threshing feed chain, which is changed and adjusted by the speed changing means. It is provided with a target value setting means of the formula.

For example, the operator manually operates the target value setting means to set the target value of the transport speed of the threshing feed chain,
Since it can be changed and set to any value according to the crop condition at that time, even if the crop condition changes, it can always be set to an appropriate target value for the crop condition at that time. Means suitable for carrying out any one of claims 1 to 3 are obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A combine according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a cutting unit that cuts planted grain culms and transports the cut grain culms rearward to the front of a traveling body that includes a pair of right and left crawler traveling devices 1 </ b> R and 1 </ b> L and is configured to be able to travel. 2 is provided so as to be capable of ascending and descending, and is provided with a control unit 3, a threshing device 4 for threshing the harvested grain culm, a Glen tank for storing threshed grains, and the like on the rear side of the traveling machine body.

The cutting section 2 includes a weeding tool 5 for sorting and planting the planted cereal culm of the target crop, a raising device 6 for raising the planted cereal culm in an upright posture, and a stock side of the raised cereal culm. Clipper-type cutting device 7 that cuts and cuts, an auxiliary transport device 8 that conveys a plurality of cut grain culms to be gathered toward the center side in the cutting width direction, and gradually gathers the harvested grain culms in a standing posture. The vertical transport device 9 and the like for transporting the vehicle rearward while changing the posture to the laterally inclined posture are pivotally supported so as to be able to vertically move and swing around the horizontal axis P with respect to the machine body. The mowing unit 2 is configured to be driven up and down by an expansion and contraction operation of a hydraulic cylinder (not shown).

As shown in FIG. 2, the vertical conveying device 9 comprises an endless rotating chain 11 which is received and guided by a guide member 10 and a clamping rail 12, and clamps the root side of the harvested grain culm. The holding base 9A for conveying the stock, the endless rotating chain 14a guided by the guide member 13 is provided with locking claws 14b at appropriate intervals. It is provided with a tip locking and conveying device 9B that locks and conveys the tip side, and an inclined guide plate 9C that receives and guides the tip side of the harvested grain culm, which is gradually changed to the sideways posture, while slidingly contacting it.

As shown in FIG. 3, the threshing device 4 is a threshing feed chain for nipping and transporting the root side of the harvested grain culm conveyed by the vertical conveying device 9 with the nipping rail 16. 17, a handling cylinder 19 provided in the handling room 18 for handling and processing the tip side of the harvested grain culm conveyed by the threshing feed chain 17, and a handling room 1 below the handling room 18
The sorting unit 21 is provided with a sorting unit 21 that sorts the processed material that has been processed and leaked from the receiving network 20 and leaks floating dust to the outside, and the like.
Grain, second material, etc. are leaked by specific gravity difference sorting while swinging and transferring the processed material leaked from the receiving net 20, and the straw waste is discharged to the dust outlet 2.
The rocking sorter plate 24 for discharging the dust from the 3 to the outside, the Karamin 25 for blowing fine dust toward the dust discharging fan 22, and the grain that leaks from the rocking sorter plate 24 to be collected and transported to the Glen tank The recovery unit 26 includes a second product recovery unit 27 that recovers the second product leaking from the swing sorting plate 23 and returns the second product to the swing sorting plate 23.

On the side wall 18a on the upper side of the handling room 18 in the grain culm transport direction, there is formed a grain stalk supply port 28 for inserting the front end of the harvested grain stalk into the interior of the handling room 18. On the outer side of the supply port 28 on the upstream side in the grain conveying direction, a guide plate 29 is provided which guides down while guiding the ear end side of the harvested grain culm delivered from the conveying end portion of the vertical conveying device 9. . The harvested grain culm transported by the vertical transport device 9 is:
Its stock side is threshing feed chain 17 and clamping rail 1
6 and is conveyed by being conveyed in a state of being pinched, and is conveyed by the threshing feed chain 17. And is inserted into the handling room 18 through the grain stalk supply port 28.

Next, the transmission configuration of the combine will be described. As shown in FIG. 4, while the power of the mounted engine E is supplied to the threshing device 4, the power of the engine E is transmitted to the hydrostatic continuously variable transmission HST, and the power of the hydrostatic continuously variable transmission HST is controlled. The power after the shift is transmitted to the left and right crawler traveling devices 1R and 1L via the transmission case 30 and also transmitted to the reaper 2 via the one-way rotating clutch 31. The one-way rotation clutch 31 is provided to drive the reaper 2 only when the vehicle body travels forward, and to prevent the reverse rotation when the vehicle body moves backward. An endless rotating chain 11 of the stock-holding and conveying device 9A in the reaper 2,
The endless rotation chain 14a of the tip locking and conveying device 9B
The same drive shaft 32 is configured to be rotationally driven in synchronization with each other, and furthermore, a hydraulic continuously variable transmission H for traveling the vehicle body.
The drive is performed by the power after the speed change of ST, and the speed of the vertical transport device 9 is changed so that the transport speed increases as the vehicle speed increases. Note that the hydrostatic continuously variable transmission HST is configured to perform a shift operation by operating a shift lever 33 provided in the control section 3. Although not shown, the transmission case 30 is provided with a steering drive mechanism for turning on and off the power transmission to each of the right and left crawler traveling devices 1R and 1L. A vehicle speed sensor S1 is provided for detecting a vehicle speed based on the number of rotations of a traveling output shaft with respect to the crawler traveling device.

A split pulley type belt continuously variable transmission 34 is provided in the transmission mechanism from the engine E to the threshing feed chain 17, and the speed of transport of the harvested grain culm by the threshing feed chain 17 even when the engine speed is constant. Can be changed and adjusted steplessly within the setting adjustment range. The power of the engine E may be directly transmitted to other devices other than the threshing feed chain 17 in the threshing device 4, or a transmission may be appropriately provided to shift the speed. A detailed description thereof will be omitted.

Next, the structure of the split pulley type belt continuously variable transmission 34 will be described. In the belt continuously variable transmission 34, a split pulley type driven pulley 36 capable of changing and adjusting a pulley interval along an axis of the output shaft 35 for the threshing feed chain 17 is provided. Transmission belt 3 over pulley 37
8 are wound. As shown in FIG. 5, the transmission belt 38 is stretched in a state where tension is always applied by a tension pulley that is tensioned and biased by a spring, and the transmission belt 38 is moved in a direction in which the belt is separated from each other by the tension of the belt. A cam mechanism 41 for moving the split pulley type driven pulley 36 in the approaching / separating direction against the urging force thereof is provided on an outer peripheral portion of the output shaft 35. The operation arm 42 of the cam mechanism 41 is linked with an oscillating arm 45 that is rotated by a power of an electric motor 43 via a gear meshing mechanism 44 via an operation wire 46, and controls the drive of the electric motor 43. Thus, the gear ratio between the driven pulley 36 and the driving pulley 37 can be changed and adjusted steplessly. The output shaft 35 is provided with a rotation speed sensor S2 for detecting the rotation speed.

As shown in FIG. 6, a control device 47 using a microcomputer is provided as control means for controlling the operation of the electric motor 43. The threshing feed chain 17 which is changed and adjusted by the electric motor 43 is provided.
A speed adjuster 48 is provided as a manually operated target value setting means for setting the target value of the transport speed. The speed adjuster 48 includes an operation knob 48a rotatably provided on an operation panel of the control unit 3 by a manual operation, and a potentiometer 48b whose output value changes according to the rotation operation of the operation knob 48a. And the potentiometer 48
The configuration is such that the output value of b is input to the control device 47. The control device 47 receives information of each of the vehicle speed sensor S1, the rotation speed sensor S2, and the speed adjuster 48. Based on the information, the transport speed of the threshing feed chain 17 increases as the vehicle speed increases. In a state where the threshing feed chain 17 is changed in accordance with the adjustment state by the speed controller 48, the target value of the conveying speed of the threshing feed chain 17 is changed and set, and the threshing feed chain 17 is changed.
The operation of the electric motor 43 is controlled so that the actual conveyance speed (detected value) of the electric motor 43 becomes the target value.

More specifically, as shown in FIG. 7, if the state of adjustment by the speed adjuster 48 is, for example, at the center position of the adjustment range, as shown in FIG. The target value of the transport speed of the threshing feed chain 17 is changed so that the range from to the highest speed is divided into five regions, and the speed is changed stepwise so that the lower the vehicle speed and the higher the vehicle speed, the higher the speed. The characteristics are set in advance. When the speed adjuster 48 is operated from the center position of the adjustment range to, for example, the “stock leading” side, the change characteristic is changed to the upper side in FIG. 7, that is, to the side where the conveying speed of the threshing feed chain 17 increases. The translation is performed by an amount corresponding to the amount, that is, a new change characteristic line is set by steplessly changing, and conversely, when the speed controller 48 is operated to the “head ahead” side, The change characteristic is on the lower side in FIG.
Is moved in parallel to the side where the transport speed decreases, that is, a new change characteristic is set by steplessly changing the transfer amount.

When the operator adjusts the speed adjuster 48 to an appropriate position in accordance with the condition of the crop to be harvested, such as the length of the harvested culm, the change characteristic is determined based on the adjusted speed. Therefore, based on the determined change characteristics, the control device 47 sets the actual transport speed of the threshing feed chain 17 detected by the rotation speed sensor S2 in accordance with the vehicle speed detected by the vehicle speed sensor S1. The operation of the electric motor 43 is controlled so as to reach the target value. For example, if the tip side tends to be delayed as indicated by K2 in FIG.
8 is operated to the "earlier leading" side, or when the stock side is too late, the speed controller 48 is operated to the "earlier leading" side, as shown by K1 in FIG. The harvested culm can be delivered in an appropriate posture such that the ear tip is slightly ahead. The transport speed of the vertical transport device 9 always becomes the same transport speed if the vehicle speed is the same, but the transport speed of the threshing feed chain 17 varies with the operation of the speed regulator 48 even if the vehicle speed is the same. It is adjusted and adjusted to the value that has been set. Therefore, the electric motor 43 and the control device 47 constitute speed changing means capable of changing and adjusting the conveying speed of the threshing feed chain 17 with respect to the conveying speed of the vertical conveying device 9.

[Another Embodiment] Another embodiment will be described below.

(1) In the above embodiment, as the target value setting means, an operation knob rotatably provided by a manual operation and a potentiometer whose output value changes with the turning operation of the operation knob are used. Illustrate what is composed,
Although the status display as a guide of the operation is shown as "stock origin advance" or "ear tip advance", instead of such a configuration, a configuration described in the following (a) to (c) may be adopted. Good.

(A) As shown in FIG. 9, as a status display displayed on the operation panel and serving as a guide when operating the operation knob 48a, a display such as "feed chain", "slow", "fast" or the like may be used. Good.

(B) The target value of the conveying speed of the threshing feed chain 17 may be changed stepwise in a plurality of steps instead of steplessly changing and adjusting the target value within the set range. At this time, instead of the potentiometer-type configuration, the operation tool may have a configuration in which a plurality of switches are pressed and selected to be set.

(C) Instead of the potentiometer type target value setting means as described above, the following configuration may be adopted. That is, as shown in FIG. 10, a dot matrix type liquid crystal display unit 50 is provided on the operation panel of the control unit 3,
The liquid crystal display unit 50 is controlled by a control device (not shown).
Various types of information about a plurality of operations of the combine are configured to be selectively displayed. For example, FIG. 10A shows an engine speed detected by an engine speed sensor (not shown). This shows the displayed state. By operating the mode changeover switch 51, it is possible to change to a display state of various information. As shown in FIG. 10B, setting information of a target value of the transport speed of the threshing feed chain 17 is displayed as one of various types of information. , Up switch 5
2. When the target value of the transport speed is changed using the down switch 53, the level meter display portion 50a of the liquid crystal display portion 50, which is black and white inverted, is sequentially changed to black, and the target value of the transport speed of the threshing feed chain 17 is changed. , By pressing the determination switch 54, the value can be determined. The above-mentioned up switch 52, down switch 53 and decision switch 54 are also used for other control information other than the speed of the threshing feed chain 17.

(3) In the above embodiment, the vertical transfer device 9 receives the power after shifting of the transmission for traveling the vehicle body as it is, so that as the vehicle speed increases, the respective transfer speeds increase. However, the present invention is not limited to such a configuration. For example, as a configuration in which power from the engine E is transmitted to the vertical conveyance device 9 via a dedicated transmission,
The transmission may be controlled such that the transport speed increases as the vehicle speed increases, or the power after shifting of the transmission for traveling the vehicle body may be transmitted to the vertical transport device 9 via a dedicated transmission. It is good also as a structure to tell.

(4) In the above embodiment, when the target value of the conveying speed of the threshing feed chain 17 is set so as to increase as the vehicle speed increases, the target speed from the minimum vehicle speed to the maximum vehicle speed is set. The range is divided into five regions, and the configuration is set such that the lower the vehicle speed is, and the higher the vehicle speed is, the higher and the higher the vehicle speed is. It may be divided into six or more steps, or may be set so as to change in steps of two to four steps. Further, instead of the configuration that changes stepwise, it may be changed to a stepless state.

(5) In the above embodiment, as the speed changing means capable of changing and adjusting the conveying speed of the threshing feed chain with respect to the conveying speed of the conveying device, an electric motor and a control device for controlling the electric motor are used. As illustrated,
The operation may be performed by using a hydraulic actuator in place of the electric motor. The present invention is not limited to the configuration in which the adjustment is automatically performed using such an actuator, and the configuration may be such that the speed is changed by a manual operation.

[Brief description of the drawings]

FIG. 1 is a side view of the front part of the combine.

FIG. 2 is a vertical sectional front view of a vertical transport device.

FIG. 3 is a simplified side view showing the configuration of the threshing apparatus.

FIG. 4 shows a transmission system.

FIG. 5 is a diagram showing a shift operation structure of the belt continuously variable transmission.

FIG. 6 is a control block diagram.

FIG. 7 is a diagram showing speed control characteristics.

FIG. 8 is a plan view of a transfer section between the vertical transport device and the threshing feed chain.

FIG. 9 is a diagram showing an operation knob according to another embodiment.

FIG. 10 is a diagram showing a target value setting unit according to another embodiment.

[Explanation of symbols]

 4 Threshing device 7 Harvesting device 9 Transport device 17 Threshing feed chain

Claims (4)

[Claims] 1. A harvesting device for cutting a plant root of a planted grain culm, and a conveyer toward a threshing device in a state in which the stem side of the harvested grain culm is sandwiched and the tip side of the harvested grain culm is locked. And a threshing feed chain that conveys in a state where the spike side is inserted into the handling room of the threshing device and is handled and processed in a state where the root side of the harvested grain culm delivered from the transport device is sandwiched. A combine comprising: a speed change unit configured to change and adjust a transfer speed of the threshing feed chain with respect to a transfer speed of the transfer device. 2. The combine according to claim 1, wherein each of the conveying device and the threshing feed chain is configured to change the speed such that the higher the vehicle speed, the higher the respective conveying speed. 3. The combine according to claim 1, wherein the speed changing unit is configured to change and adjust the conveying speed of the threshing feed chain to a plurality of stages within a set range. 4. The apparatus according to claim 1, further comprising artificially operated target value setting means for setting a target value of the transport speed of the threshing feed chain which is changed and adjusted by the speed changing means. Or the combine according to item 1.