JP6968407B2 - Agricultural work machine - Google Patents

Description

The present invention relates to an agricultural work machine. In particular, the present invention relates to an agricultural work machine which is attached to the rear part of a traveling machine and cultivates a field while rotating the rotary working part and traveling along with the forward running of the traveling machine.

In general, a rotary work machine is a frame connected to a traveling machine, a work rotor that is pivotally supported by the frame and has a plurality of tillage claws rotating around a rotation axis, and a cover body for a shield that covers the upper part of the work rotor. It has (hereinafter referred to as "shield cover") and an apron member that is rotatably supported by the shield cover and can be lowered and flipped up and rotated.

On the other hand, when the cultivated claw rotates, some soil may adhere to the cultivated claw depending on the condition of the soil (when the viscosity is high, the soil containing water, etc.). Further, a part of the soil adhering to the tilling claw may be scattered by the centrifugal force generated by the rotation and adhere to the side surface of the main body (sometimes referred to as a side plate). The soil adhering to the side plate will remain on the side plate unless the operator scrapes it off. The soil that adheres to the side plate for a long period of time gradually dries and hardens. The contact with the hardened soil may wear the outer part of the cultivated claw closest to the side plate among the plurality of cultivated claws.

Therefore, in order to prevent soil from adhering to the side plate, Patent Document 1 discloses that the main body side plate is provided with a mirror-processed stainless steel plate.

Japanese Unexamined Patent Publication No. 2001-275405

However, even if a mirror-finished stainless steel plate is used, the surface of the side plate gradually becomes rough due to contact with stones and other hard objects in daily tillage work, and the effect of preventing soil adhesion is achieved. It may decrease. For this reason, there is a problem that soil gradually adheres to the side plate, and as a result, the tilling claws are worn due to contact with the hardened soil.

Therefore, one of the objects of the present invention is to provide an agricultural work machine capable of long-term use of cultivated claws by preventing soil from adhering to the side plate for a long period of time.

According to one embodiment of the present invention, a main body having a plurality of tilling claws and supporting a rotary working portion for performing tilling work around a rotation axis, and an apron rotatably supported by a rear end portion of the main body. The main body includes a side plate arranged at the end of the rotary working part and an earth retaining member fixed to the side plate, and the earth retaining member is the tilling member closest to the side plate among a plurality of tilling claws. The first part arranged between the claw and the side plate, and the second part arranged toward the second space above the first space through which the apron claw closest to the side plate rotates when rotating. And, including agricultural work machines, are provided.

In the above-mentioned agricultural work machine, the soil retaining member may have a shape along the outer shape of the first space.

In the above agricultural work machine, the apron is arranged from the side surface of the apron toward the front, and includes an apron shield having a plane parallel to the side plate of the main body, and when the apron rotates, the apron shield is attached to the inner wall of the side plate. It may rotate along and be in close proximity to the side plate.

In the above-mentioned agricultural work machine, the apron may rotate when the agricultural work machine turns, and the apron shield may rotate according to the movement of the apron.

In the above-mentioned agricultural work machine, the soil retaining member may be arranged behind the rotation axis with respect to the traveling direction.

In the above-mentioned agricultural work machine, the soil retaining member may be arranged so as to be inclined diagonally forward with respect to the traveling direction.

In the above-mentioned agricultural work machine, the soil retaining member may contain an inorganic material.

In the above-mentioned agricultural work machine, a part of the soil retaining member may have a portion in contact with the tilling claw closest to the side plate.

In the above-mentioned agricultural work machine, the soil retaining member may contain an elastic material.

In the above-mentioned agricultural work machine, the soil stopper member may be removable.

According to one embodiment of the present invention, a main body having a plurality of tilling claws and rotatably supporting a rotary working portion for performing tilling work around a rotation axis, and a rotatably supporting portion at the rear end portion of the main body. The main body comprises a side plate arranged at the end of the rotary working part and an earth retaining member fixed to the side plate, including the apron, and the apron is arranged from the side to the front of the main body. An apron shield having a plane parallel to the side plate is provided, and the earth retaining member is provided between the cultivated claw closest to the side plate and the side plate among a plurality of cultivated claws.

According to the present invention, it is possible to provide an agricultural work machine capable of long-term use of cultivated claws by preventing soil from adhering to the side plate for a long period of time.

It is a top view of the agricultural work machine which concerns on one Embodiment of this invention. It is a side view of the agricultural work machine which concerns on one Embodiment of this invention. It is a simplified perspective view of the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a rear view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a rear view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a side view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a side view which simplified the main body end portion of the agricultural work machine at the time of a tilling work and a turning time which concerns on one Embodiment of this invention. It is a modification of the side view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a modification of the side view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a modification of the side view which simplified the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a simplified perspective view of the main body end portion of the agricultural work machine which concerns on one Embodiment of this invention. It is a rear view which simplified the main body end part of the conventional farm work machine. It is a side view which simplified the main body end part of the farm work machine of the conventional example.

Hereinafter, embodiments of the agricultural working machine of the present invention will be described with reference to the drawings. However, the agricultural work machine of the present invention can be carried out in many different modes, and is not construed as being limited to the contents described in the examples shown below. In the drawings referred to in this embodiment, the same parts or parts having similar functions are designated by the same reference numerals, and the description thereof will be omitted. Further, for convenience of explanation, the terms front (front side) or rear (rear side) will be used, but the front (front side) indicates the direction of the traveling machine 300 for pulling the farm work machine 100 with respect to the farm work machine 100, and the rear (front side). The rear side) indicates the direction of the agricultural work machine 100 with respect to the traveling machine 300.

<First Embodiment>
(1-1. Configuration of agricultural work machine)
FIG. 1 is a top view of an agricultural work machine 100 (sometimes referred to as a rotary work machine or a cultivator) according to the first embodiment of the present invention. FIG. 2 is a side view of the agricultural work machine 100. As shown in FIG. 1, the agricultural work machine 100 according to the present embodiment includes a main body 101 (including a main frame 110 and a shield cover 120), a rotary work unit 102, an apron 130, and the like.

The main frame 110 of the main body 101 is attached (connected) to the rear portion of the traveling machine body 300 such as a tractor. The main frame 110 is cylindrical and has a power transmission shaft inside. A gearbox 125 is attached to the main frame 110.

The rotational power from the traveling machine body 300 such as the tractor traveling forward is transmitted to the PIC (Power Input Connection) shaft 106 of the agricultural work machine 100, the gear (not shown) in the gearbox 125, and the shaft (not shown) in the left side of the main frame 110. NS. Further, this rotational power is changed to the left in the traveling direction of the agricultural work machine 100 and is transmitted to the rotary shaft 104 of the rotary work unit 102 by the chain transmission mechanism in the chain case 105. Then, the farm work machine 100 advances along with the forward running of the traveling machine 300 while rotating the rotary working unit 102 to cultivate the field.

The rotary working unit 102 is composed of a rotating shaft 104 of the main body 101 and a plurality of tilling claws 103 provided on the rotating shaft 104. The rotary working unit 102 is supported by the main body 101. As shown in FIG. 2, the plurality of tilling claws 103 have a vertical blade portion 103A extending perpendicularly to the rotation axis 104 from the mounting portion and a horizontal blade portion 103B bent to the right or left with respect to the traveling direction. Have. In the plurality of cultivated claws 103, the region (width) in which the individual cultivated claws 103 dig up the soil overlaps with the adjacent cultivated claws 103. The rotary working unit 102 rotates so as to scoop up the soil from the rear to the front in the traveling direction.

The shield cover 120 is arranged so as to cover the upper part of the rotary working portion 102. A side plate 121 is provided on the side surface of the shield cover 120. In this case, it can be said that the side plate 121 is arranged at the end of the rotary working portion 102. In FIGS. 3 to 6 described later, the side plate 121 on the right side surface with respect to the traveling direction is shown.

The apron 130 is supported so as to be able to descend and flip up around a rotation fulcrum 140 fixed to the rear end portion of the shield cover 120. The apron 130 is arranged behind the rotary working unit 102. Since the center of gravity of the apron 130 is behind the rotation fulcrum 140, the apron 130 tends to descend due to its own weight.

A lock mechanism 150 is provided between the pedestal 111 provided on the main frame 110 and the apron 130. The lock mechanism 150 functions to press the apron 130 and the ground preparation plate 131 against the field with a constant pressure when the apron 130 is in the lowered state. The magnitude of the force exerted by the lock mechanism 150 can be adjusted by the operation of the operator. Further, the lock mechanism 150 is locked according to each working state.

A ground level plate 131 made of stainless steel or the like is welded to the tip of the apron 130. The ground level plate 131 is configured to draw a loop from the inside to the outside of the apron 130. The ground leveling plate 131 flattens the field dug up by the rotary working unit 102. The apron 130 and the ground plate 131 are collectively referred to as an apron member.

Further, movable extended ground leveling plates 133 are provided at both ends of the ground leveling plate 131 (see FIG. 1). By opening the extended ground leveling plate 133, it becomes possible to level a wide range together with the ground leveling plate 131.

On the other hand, the apron 130 is provided with an apron shield 132. The apron shield 132 is arranged from the side surface of the apron 130 toward the front (traveling direction). In FIG. 2, the apron shield 132 on the right side surface with respect to the traveling direction is shown. Further, the apron shield 132 has a surface parallel to the side plate 121. At this time, the apron shield 132 is provided inside the inner wall of the side plate 121 (on the side of the tilling claw 103). The configuration of the end portion of the agricultural work machine 100 including the apron shield 132 will be described below.

(1-2. Configuration of the end of the agricultural work machine)
FIG. 3 is a simplified perspective view of the end portion 100A of the agricultural work machine 100. 4 and 5 are rear views showing the end portion 100A of the agricultural work machine 100 in a simplified manner. FIG. 6 is a simplified side view of the end portion 100A of the agricultural work machine 100.

As shown in FIG. 3, in addition to the tilling claw 103, the side plate 121, the apron 130, and the apron shield 132, the earth retaining member 160 is arranged at the end portion 100A of the agricultural work machine 100. Note that, among the plurality of tilling claws 103, FIG. 3 and FIG. 4 show the tilling claw 103-1 closest to the side plate 121.

Further, as shown in FIG. 3, the earth retaining member 160 is arranged so as to be inclined diagonally forward with respect to the traveling direction L. At this time, the earth retaining member 160 is gradually separated from the side plate 121 in the traveling direction L from the fixed portion 160F, and is in the farthest state at the tip portion 160T. As a result, as will be described later, when the soil adhering to the tilling claw 103 and the soil retaining member 160 come into contact with each other, it is possible to prevent an excessive load from being applied. In the above, the soil retaining member 160 excluding the fixing portion 160F does not have to be flat. For example, the soil retaining member 160 may have a bent portion other than the fixed portion 160F, or may have a curved surface shape.

As shown in FIGS. 4 and 5, the earth retaining member 160 has a first portion 160A and a second portion 160B. The first portion 160A is a portion arranged between the tilling claw 103-1 (specifically, the surface 103-1C on the side plate 121 side of the tilling claw 103-1 (see FIG. 4)) and the side plate 121. say.

Further, the second part 160B is shown as follows. As shown in FIGS. 5 and 6, when the tiller claw 103-1 rotates, it passes through the first space S1. At this time, the space above the first space S1 (or outside the rotation axis 104) is referred to as the second space S2. The second portion 160B refers to a portion extending from the side plate 121 toward the second space S2 and arranged.

As shown in FIGS. 4 to 6, the soil retaining member 160 has the first portion 160A and the second portion 160B, so that even if the soil is released from the tilling claw 103-1, it is stopped by the soil retaining member 160. be able to.

Further, as shown in FIGS. 4 and 5, in this example, the first portion 160A is arranged between the vertical blade portion 103-1A of the tilling claw 103-1 and the side plate 121 with a small gap. There is. Further, the second portion 160B has a shape along the outer shape F1 of the first space S1 and is arranged with a small gap. From the above, the earth retaining member 160 is arranged close to the rotation locus (that is, the first space S1) through which the tilling claw 103-1 passes. As a result, it is possible to more efficiently prevent the soil released by the tilling claw 103-1 from adhering to the front side of the side plate 121 in the traveling direction with respect to the soil retaining member 160. It can be said that the second portion 160B reflects the shape of the surface 103-1C on the side plate 121 side of the tilling claw 103-1 when the tilling claw 103-1 is close to the soil retaining member 160.

Further, as shown in FIG. 6, the earth retaining member 160 is arranged at the rear upper portion of the rotation shaft 104 with respect to the traveling direction L. At this time, the earth retaining member 160 is arranged around the rotation axis 104 in the direction (D1 direction) rotated clockwise from the direction perpendicular to the ground. As a result, although the details will be described later, the soil adhering to the side plate 121 can be easily scraped off by the rotation of the apron shield 132.

The soil retaining member 160 is fixed to the side plate 121 with bolts. That is, it can be said that the soil retaining member 160 is removable. Since the earth retaining member 160 is removable, it can be replaced as appropriate even when the earth retaining member 160 is worn. Therefore, it can be said that it is a farm work machine with high maintainability.

Further, the material of the earth retaining member 160 is not limited, but for example, an inorganic material is used. Specifically, a material such as a stainless steel plate or ceramics is used for the earth retaining member 160. Further, an organic material such as a resin or wood can be used, or a composite material in which an inorganic material or an organic material is appropriately combined can be used. Moreover, you may use the earth retaining member 160 which has been appropriately surface-treated. For the surface treatment in this case, a blast treatment, a heat treatment, and a plating treatment are used. By performing the surface treatment, the durability of the earth retaining member 160 can be improved.

From the above, the soil retaining member 160 has a function of removing the soil adhering to the tilling claw 103. Further, the earth retaining member 160 has a function of preventing soil from adhering to the front of the earth retaining member 160 in the traveling direction L of the side plate 121.

(1-3. Removal of soil adhering to the side plate)
The work of removing the soil adhering to the side plate 121 is shown below. FIG. 7A is a side view of the agricultural work machine 100 during the tilling work. FIG. 7B is a side view of the agricultural work machine 100 when turning.

As shown in FIG. 7A, the apron 130 is fixed in a raised state during the tilling operation. At this time, the apron shield 132 prevents soil from being thrown out of the main body 101 from the first region A1 which is a gap between the apron 130 and the side plate 121. On the other hand, the soil released by the tilling claw 103-1 is stopped by the soil retaining member 160 and adheres to the second region A2. Alternatively, the soil adhering to the tilling claw 103-1 is scraped off by the earth retaining member 160 and adheres to the second region A2.

The farming machine 100 cultivates the field in a straight line, and then performs a turning operation to cultivate the adjacent soil. At this time, as shown in FIG. 7B, the apron 130 rotates clockwise (R2) around the rotation fulcrum 140 in a clockwise direction from the time of tilling work. This rotation operation may be performed in combination with the lock mechanism 150 (see FIGS. 1 and 2) by, for example, an operator operating a button on the remote controller provided on the side of the driver's seat of the traveling machine body 300. Alternatively, in this rotation operation, the operator may manually rotate the apron 130. Alternatively, this rotation operation may be performed by automatic control of the agricultural work machine 100. As described above, the apron shield 132 is fixed to the apron 130. Further, the apron shield 132 is provided inside the inner wall of the side plate 121 (on the side of the tilling claw 103). The apron shield 132 has a surface parallel to the side plate 121.

In the above, the apron shield 132 rotates along the inner wall of the side plate 121 in accordance with the rotation of the apron 130. Further, when the apron shield 132 rotates in the R2 direction, the apron shield 132 rotates to the overlapping portion P1 in a part of the earth retaining member 160. At this time, the apron shield 132 and the side plate 121 are in close proximity to each other. As a result, the soil adhering to the side plate 121 is scraped off by the rotational operation of the apron shield 132. In the above, the apron shield 132 and the earth retaining member 160 may be close to each other with a certain distance between the earth retaining member 160 and the side plate 121.

Here, FIGS. 12 and 13 show a rear view and a side view of the end portion of the agricultural work machine in the conventional configuration. In the case of the conventional configuration, the space S11 exists between the rotating tilling claw 103-1 and the side plate 121. Therefore, the soil released by the tilling claw 103-1 at the time of tilling may adhere to the region A11 of the side plate 121 through the space S11. When soil adhered to the area A11, it was not easy to remove the soil.

However, by using one embodiment of the present invention, the earth retaining member 160 is provided. Therefore, as described above, it is possible to prevent the soil from adhering to the region A11. Further, the soil adhering to the side plate 121 is scraped off by the rotational operation of the apron shield 132. Further, in order to appropriately rotate the agricultural work machine 100, the rotation operation of the apron 130 and the apron shield 132 is repeatedly performed. Therefore, the soil adhering to the side plate 121 is repeatedly removed by the apron shield 132. As a result, it is possible to prevent the surface 103-1C of the vertical blade portion 103-1A and the horizontal blade portion 103-1B on the side plate 121 side of the tilling claw 103-1 from being worn. That is, by using one embodiment of the present invention, it is possible to provide an agricultural work machine capable of long-term use of cultivated claws by preventing soil from adhering to the side plate for a long period of time.

In the above, the earth retaining member 160 is shown in the rear upper portion of the rotation shaft 104 with respect to the traveling direction L, but the present invention is not limited to this. 8, 9 and 10 are side views showing the end 100A of the agricultural work machine 100 in a simplified manner. As shown in FIG. 8, the earth retaining member 160-1 may be provided in front of the rotation shaft 104 of the rotary working portion 102 with respect to the traveling direction L. Alternatively, as shown in FIG. 9, the earth retaining member 160-2 may be provided above the rotating shaft 104 of the rotary working portion 102. Alternatively, as shown in FIG. 10, the earth retaining member 160-3 may be provided at the same height as the rotation shaft 104 of the rotary working portion 102 and the ground. The position, angle, and shape of the earth retaining member 160 may be appropriately selected depending on the direction in which the soil released by the tilling claw 103-1 is scattered. At this time, the shape of the apron shield 132 may be changed as appropriate.

Further, in the present embodiment, an example is shown in which the apron shield 132 rotates to the overlapping portion P1 in a part of the soil retaining member 160, but the present invention is not limited to this. The rotation of the apron shield 132 may be stopped before it overlaps with the earth retaining member 160. The rotation range of the apron shield 132 may be appropriately changed depending on the shape of the apron shield 132.

Further, in the present embodiment, even if the soil retaining member 160 is extended and arranged on the tilling claw (for example, the tilling claw 103-2 shown in FIG. 1) inside the tilling claw 103-1 closest to the side plate 121. good. As a result, the soil retaining effect can be further enhanced.

<Second Embodiment>
The agricultural work machines having different configurations will be described below with reference to the drawings. In addition, about the same part as the structure shown in 1st Embodiment, the explanation is referred to.

FIG. 11 is a simplified perspective view of the end portion 100-1A of the agricultural work machine 100-1. A tiller claw 103-1, a shield cover 120, a side plate 121, an apron 130, an apron shield 132, and a soil retaining member 161 are arranged at the end portion 100-1A of the agricultural work machine 100-1.

The earth retaining member 161 has the same function as the earth retaining member 160. On the other hand, the earth retaining member 161 includes an elastic member. For example, a plate-shaped rubber member is arranged as the earth retaining member 161. At this time, the earth retaining member 161 may have a portion in contact with the tilling claw 103-1 during the tilling operation. In the above, since the soil retaining member 161 has elasticity, it is possible to remove the soil adhering to the tilling claw 103-1 while suppressing the load applied to the tilling claw 103-1. The soil retaining member 161 may be arranged so as to extend from the side plate 121 toward the shield cover 120 as well as the side plate 121. At this time, the soil stopper member 161 vibrates by coming into contact with the rotating cultivated claw 103-1 or the soil released by the cultivated claw 103-1. As a result, the soil adhering to the soil retaining member 161 itself can be efficiently removed by vibration.

Further, a plurality of soil retaining members 161 may be arranged. For example, as shown in FIG. 11, three earth retaining members 161 are arranged. At this time, another earth retaining member 161 (earth retaining member 161-) arranged on the L side in the traveling direction while earth retaining is performed by the earth retaining member 161 (earth retaining member 161-1) closest to the apron shield 132. 2 and the soil retaining member 161-3) can effectively prevent soil from adhering to the front of the side plate 121 and the inner surface of the shield cover 120.

(Modification 1)
In the first embodiment and the second embodiment of the present invention, the rotary working machine has been described as an example of the agricultural working machine, but the present invention is not limited thereto. The agricultural work machine according to the present invention may be a puddling machine, or may be a rotary working machine or an agricultural working machine other than the puddling machine.

(Modification 2)
In the first embodiment of the present invention, the earth retaining member 160 is fixed to the side plate 121 with bolts, but the present invention is not limited to this. The earth retaining member 160 may be arranged by being welded to the side plate 121. As a result, the adhesion of soil to the vicinity of the fixing bolt is suppressed.

(Modification 3)
In the first embodiment, the earth retaining member 160 has an example of having a flat plate shape, but the present invention is not limited thereto. The soil retaining member 160 may have a block shape or a frame shape. The shape of the earth retaining member 160 may be appropriately selected according to the work environment and the like.

100 ... Agricultural work machine, 100A ... End, 101 ... Main body, 102 ... Rotary work part, 103, 103-1 ... Tillage claw, 103-1C ... Surface, 103A, 103 -1A ... Vertical blade part, 103B, 103-1B ... Horizontal blade part, 104 ... Rotating shaft, 105 ... Chain case, 106 ... PIC shaft, 110 ... Main frame, 111 ... pedestal, 120 ... shield cover, 121 ... side plate, 125 ... gearbox, 130 ... apron, 131 ... ground plate, 132 ... apron shield, 133 ... extension Ground leveling plate, 140 ... rotation fulcrum, 150 ... lock mechanism, 160 ... earth retaining member, 161 ... earth retaining member, 300 ... traveling machine body, A1 ... first area, A11 ... area, A2 ... second area, L ... traveling direction, S1 ... first space, S11 ... space, S2 ... second space

Claims (11)

The main body that has multiple tilling claws and supports the rotary work part that performs tilling work around the rotation axis,
An apron rotatably supported at the rear end of the main body,
Including
The main body includes a side plate arranged at the end of the rotary working portion and a soil retaining member fixed to the side plate.
The earth retaining member includes a first portion and a second portion provided in succession from the first portion.
The first portion is arranged between the cultivated claw closest to the side plate among the plurality of cultivated claws and the side plate.
The two portions are arranged in a second space above the first space through which the tilling claw closest to the side plate rotates , and have a shape along the outer shape of the first space. Agricultural work machine. The earth retaining member has a shape along the outer shape of the first space from the first portion to the second portion.
The agricultural work machine according to claim 1. The apron is arranged from the side surface of the apron toward the front, and includes an apron shield having a plane parallel to the side plate of the main body.
When the apron rotates, the apron shield rotates along the inner wall of the side plate and is in close proximity to the side plate and the earth retaining member.
The agricultural work machine according to claim 1 or 2. The apron rotates when the agricultural work machine turns, and the apron shield rotates according to the movement of the apron.
The agricultural work machine according to claim 3. The earth retaining member is arranged behind the rotation axis with respect to the traveling direction.
The agricultural work machine according to any one of claims 1 to 4. The soil retaining member is arranged so as to be inclined toward the front diagonally with respect to the traveling direction.
The agricultural work machine according to any one of claims 1 to 5. The earth retaining member contains an inorganic material.
The agricultural work machine according to any one of claims 1 to 6. A part of the soil retaining member has a portion in contact with the tilling claw closest to the side plate.
The agricultural work machine according to any one of claims 1 to 6. The earth retaining member includes an elastic material.
The agricultural work machine according to claim 8. The soil retaining member is removable.
The agricultural work machine according to any one of claims 1 to 9. A main body that has multiple tilling claws and rotatably supports the rotary work part that performs tilling work around the rotation axis.
An apron rotatably supported at the rear end of the main body,
Including
The main body includes a side plate arranged at the end of the rotary working portion and a soil retaining member fixed to the side plate.
The apron is arranged from the side to the front and includes an apron shield having a plane parallel to the side plate of the main body.
The soil retaining member is arranged between the side plate and the cultivated claw closest to the side plate among the plurality of cultivated claws, and the first cultivated claw that passes when the cultivated claw closest to the side plate rotates. It has a shape that follows the shape of the outside of the space,
A farming machine that rotates toward the soil retaining member along the inside of the side plate when the apron rotates.

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