JP2021075290A - Product supply device - Google Patents

Abstract

To shorten conveyance standby time of a product and to accelerate the speed of product conveyance.SOLUTION: A product supply device which forms a product row B by retaining a plurality of products to be conveyed in a conveyance direction X by a first conveyance line 2 and, during this retention, supplies the product line B from the first conveyance line 2 to a second conveyance line 4 positioned above the first conveyance line 2 includes: an elevation table 18 which can be moved vertically between a lower level position P1 and an upper level position P2, and which moves up to the upper level position P2 after receiving the product row B from the first conveyance line 2 at a standby position in the conveyance direction X of the lower level position P1; an elevation unit for moving vertically the elevation table 18 between the lower level position P1 and the upper level position P2; an advance/retreat unit for advancing or retreating the elevation table 18 between the standby position and an advance position P6 in the conveyance direction X; and a control unit for moving the elevation table 18 to the advance position P6 in the process of moving the elevation table 18 down from the upper level position P2 to the lower level position P1.SELECTED DRAWING: Figure 8

Description

The present invention relates to a product supply device, and in particular, a plurality of products transported on a transfer line are stopped to form a product line, and the product line is located above the transfer line during this stop. Regarding the product supply equipment to be supplied to the transport line of.

In Patent Document 1, a plurality of products transported on a transport line are stopped to form a product line, and during this stop, the product line is supplied from the transport line to a packaging line located above the transport line. , A product supply device of an integrated packaging machine that wraps a product line with a packaging material in the process of supplying this product line is disclosed. This product supply device is equipped with a lift, which can be raised and lowered between the lower level position and the upper level position, and after receiving the product line from the transport line at the lower level position, the upper level position. Ascend to.

Japanese Unexamined Patent Publication No. 10-236434

In the above-mentioned product supply device, in the process of ascending and descending the elevating table, a plurality of products are stopped on the transport line to form a product row, so that a transport standby time of the product row occurs on the transport line. In order to further increase the transport speed of products in the product supply device, it is required to reduce such transport standby time as much as possible.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a product supply device capable of shortening a product transport standby time and increasing a product transport speed.

In order to achieve the above object, the product supply device of the present invention stops a plurality of products transported in the transport direction on the first transport line to form a product line, and during this stop, the product line is set. A product supply device that supplies products from one transport line to a second transport line located above the first transport line. It can be raised and lowered between the lower level position and the upper level position, and transports at the lower level position. An elevating table that rises to the upper level position after receiving the product line from the first transport line at the standby position in the direction, and an elevating unit that raises and lowers the elevating table between the lower level position and the upper level position. The advancing / retreating unit that advances or retracts the platform between the standby position and the advancing position in the transport direction, and the elevating platform is moved forward by the advancing / retreating unit in the process of lowering the elevating platform from the upper level position to the lower level position by the elevating unit. It is equipped with a control unit to move to.

According to the product supply device of the present invention, it is possible to shorten the product transfer standby time and realize an increase in the product transfer speed.

It is the schematic of the integrated packaging machine which incorporated the product supply device which concerns on one Embodiment of this invention. It is explanatory drawing which looked at the product supply apparatus from the side of a transport line and a packaging line. It is a perspective view which shows the drive unit of an elevating table. It is a control system block diagram of a product supply device. It is explanatory drawing which shows the state which the elevating table in the lower level position receives a product line from a transport line. It is explanatory drawing which shows the state which the elevating table rises to the upper level position from the state of FIG. 5, and the movable holder in the relay level position receives a product line from an elevating table. It is explanatory drawing which shows the state which the elevating table descends diagonally forward from the state of FIG. 6, and the movable holder rises and reaches a supply level position. By moving the pusher from the standby position to the extrusion position from the state shown in FIG. 7, the product line of the movable holder is pushed out to the packaging line, the movable holder returns to the relay level position, and the lift is positioned at the lower level position and the forward position. It is explanatory drawing which shows the state which is to be done. It is explanatory drawing which shows the state which the pusher returned to the standby position from the state of FIG. 8, and the elevating table returned to the standby position.

Hereinafter, the product supply device according to the embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic view of an integrated packaging machine 1 in which a product supply device according to an embodiment of the present invention is incorporated. The integrated packaging machine 1 includes a transport line (first transport line) 2 for the product A and a packaging line (second transport line) 4 for the product line B located above the transport line 2. The transport line 2 and the packaging line 4 are extended in the same transport direction, and the transport in these is performed by a conveyor or the like.

A supply line 6 for the packaging film F is arranged above the packaging line 4. The supply line 6 includes a pair of film rolls 8 and 10, and a packaging film F made of synthetic resin as a packaging material is drawn from one of the film rolls 8. In this case, the other film roll 10 becomes a standby roll. The packaging film F drawn out from the film roll 8 is guided between the feed roller 12 and the pinch roller 14 via a large number of guide rollers, is fed downward by the rotation of the feed roller 12, and intersects the transport direction. The feeding surface of the packaging film F is formed. The feed roller 12 is rotated in the feeding direction by, for example, a servomotor (not shown).

A cutter unit 16 is arranged downstream of the feed roller 12. The cutter unit 16 cuts the tip end side portion of the wrapping film F into wrapping film sheets S having predetermined lengths. After that, the packaging film sheet S is moved to a predetermined position while being attracted to a suction belt or the like (not shown).

The product supply device of the present embodiment is arranged between the end of the transport line 2 and the start of the packaging line 4. The product supply device stops a plurality of products A transported in the transport direction X on the transport line 2 to form a product line B as an integrated product body, and during this stop, the product line B is placed on the packaging line 4 of the packaging line 4. It is raised to the supply level position P4, which will be described later, at substantially the same level as the transport surface, and is supplied to the packaging line 4. The integrated packaging machine 1 wraps the product line with a packaging material in the process of supplying the product line.

Hereinafter, the direction along the transport direction of the product A in the transport line 2 and the packaging line 4 (for example, the horizontal direction) is set as the transport direction X, the transport direction of the product A is the forward direction (forward direction), and the opposite direction is the rearward (backward direction). ). Further, a direction (for example, a vertical direction) along the feeding surface of the packaging film F intersecting the transport direction X will be described as an elevating direction Y.

At the supply level position P4, the product line B is pushed out toward the packaging line 4 by the pusher 22 described later. The product row B is supplied onto the wrapping line 4 with the wrapping film sheet S folded at regular intervals, and the wrapping film sheet S is sealed at the folded positions of the wrapping film sheets S. .. After that, in the process of transporting the product row B on the packaging line 4, side folding, upper flap folding, lower flap folding, and side sealing of the packaging film sheet S are sequentially executed, whereby the integrated packaged product C is formed. can get. The obtained integrated package C is discharged from the packaging line 4 via a discharge chute (not shown).

FIG. 2 is an explanatory view of the product supply device as viewed from the side of the transport line 2 and the packaging line 4. The product supply device includes an elevating table 18, a movable holder 20, a pusher 22, and the like. The elevating table 18 can be elevated along the elevating direction Y between the lower level position P1 and the upper level position P2 as shown by the solid line arrow by the operation of the elevating unit 28 described later. The elevating table 18 rises to the upper level position P2 after receiving the product line B to be conveyed on the transfer line 2 at the standby position P5 in the transfer direction X of the lower level position P1. The movement of the elevating platform 18 with the operation of the advancing / retreating unit 30 described later will be described in detail later.

The lift 18 is located between the end of the transport line 2 and the start of the packaging line 4, and the lower level position P1 is positioned at substantially the same level as the transport surface of the transport line 2. The upper level position P2 is positioned below the packaging line 4 and above the lower level position P1. A stopper 18a extends from the lift 18 toward the transport line 2.

The stopper 18a has a plate shape extending in the ascending / descending direction Y, for example, and blocks the flow of the product A conveyed by the conveying line 2 in the process of ascending the elevating table 18 from the lower level position P1 to the upper level position P2. A stationary state of the product row B is formed on the line 2. As a result, the product line B is prevented from falling from the end of the transfer line 2 even if the transfer line 2 is kept in operation while the elevating table 18 is ascending / descending.

The movable holder 20 can be moved up and down between the relay level position P3 and the supply level position P4 as shown by the alternate long and short dash arrow by operating an elevating unit (not shown). Then, the movable holder 20 receives and holds the product row B of the lift 18 that has risen to the upper level position P2 at the relay level position P3, and then rises to the supply level position P4 to bring the product row B to the packaging line 4. Hand over. The relay level position P3 is positioned at substantially the same level as the upper level position P2, and the supply level position P4 is positioned at substantially the same level as the transport surface of the packaging line 4.

The movable holder 20 is composed of a pair of rail members extending along the transport line 2 and the packaging line 4. Although not shown, the rail member has a holding latch structure that can accept and temporarily hold the product row B only from below, and by receiving the product row B twice from the elevating table 18, the product row B is stacked in two layers. Then rise.

On the other hand, the pusher 22 advances from the standby position P7 in the transport direction X at the supply level position P4 and is held by the movable holder 20 as shown by the two-dot chain arrow by the operation of the advance / retreat unit (not shown). The product line B is extruded and transferred to the packaging line 4.

FIG. 3 is a perspective view showing a drive unit 24 that drives the elevating platform 18. The drive unit 24 is fixed to the integrated packaging machine 1 by a support plate 26. Although the drawings other than the main parts are omitted in FIG. 3 from the viewpoint of explanation, each component device described later of the drive unit 24 is independently operably supported by the support plate 26.

The drive unit 24 constitutes a part of the product supply device, and includes an elevating unit 28 and an advancing / retreating unit 30. The elevating unit 28 is a servomotor, an elevating motor 32, and a drive belt 34 spanned in the elevating direction Y between one pulley 33a connected to the drive shaft of the elevating motor 32 and the other pulley 33b. It is composed of an elevating slider 36 extending in the conveying direction X, an elevating rail 38 extending in the elevating direction Y, and the like.

The elevating slider 36 has a drive connecting portion 40 and an elevating guide portion 42, and the drive connecting portion 40 sandwiches a part of the drive belt 34. The elevating guide portion 42 is attached to the elevating rail 38 so as to be able to elevate. When the driving force of the elevating motor 32 is transmitted to the drive belt 34 via the drive shaft and the pulley 33a in order, the movement of the drive belt 34 is transmitted to the elevating slider 36 via the drive connecting portion 40, and the elevating slider 36 moves. The elevating guide portion 42 elevates and elevates along the elevating rail 38.

From the elevating table 18, a table support portion 18b extends downward in the elevating direction Y. A support rail portion 44 is provided along the elevating direction Y of the pedestal support portion 18b, and the pedestal support portion 18b and the elevating slider 36 are connected to the lower end portion of the pedestal support portion 18b so as to be able to advance and retreat along the transport direction X. An advancing / retreating connecting portion 46 is provided.

The elevating / retreating connecting portion 46 includes a U-shaped guide portion 46a having a U-shaped cross section provided on the elevating slider 36, a holder 46b connected to the base support portion 18b, and a U-shaped portion of the guide portion 46a provided on the holder 46b. The roller 46c is provided with a roller 46c that can advance and retreat along the transport direction X, and transmits the elevating operation of the elevating slider 36 to the table support portion 18b. When the elevating slider 36 moves up and down along the elevating rail 38, the elevating table 18 is moved between the lower level position P1 and the upper level position P2 shown in FIG. Is raised and lowered along the raising and lowering direction Y.

The advancing / retreating unit 30 is a drive belt 50 that is advanced and rotated in the transport direction X between one pulley 49a and the other pulley 49b connected to the drive shafts of the advancing / retreating motor 48, which is a servomotor, and the advancing / retreating motor 48. It is composed of an advancing / retreating slider 52 extending in the transport direction X, an advancing / retreating rail 54 extending in the transport direction X, and the like.

The advancing / retreating slider 52 has a drive connecting portion 56 at one end and an elevating guide portion 58 at the other end. The elevating guide portion 58 supports the support rail 44 in an elevating manner while transmitting the advancing / retreating operation of the advancing / retreating slider 52 to the support rail 44. Further, the advancing / retreating slider 52 is freely advancing / retreating to the support plate 26 via the connecting portion 60, the advancing / retreating guide portion 62, and the advancing / retreating rail 54.

The drive connecting portion 56 sandwiches a part of the drive belt 50. When the driving force of the advancing / retreating motor 48 is transmitted to the drive belt 50 via the drive shaft and the pulley 49a in order, the movement of the drive belt 50 is transmitted to the advancing / retreating slider 52 via the drive connecting portion 56, and the advancing / retreating slider 52 moves. The advance / retreat guide unit 62 advances / retreats along the advance / retreat rail 54. As a result, the elevating platform 18 is advanced or retracted along the transport direction X between the standby position P5 and the advancing position P6 via the elevating guide portion 58 and thus the support rail portion 44.

That is, the elevating table 18 is connected to the elevating slider 36 via the elevating / retreating connecting portion 46, and is movably supported by the advancing / retreating slider 52 via the elevating guide portion 58. As a result, the elevating table 18 can be moved up and down while advancing and retreating with the movement of the advancing / retreating slider 52 and the elevating / retreating slider 36, and the elevating table 18 can be moved diagonally downward or diagonally upward with respect to the elevating direction Y.

FIG. 4 is a control system configuration diagram of the product supply device. The product supply device includes a control unit 64 that controls the entire product, and the control unit 64 includes an elevating unit 28 and an advancing / retreating unit 30 of the elevating table 18, an elevating unit of the movable holder 20, and an advancing / retreating unit of the pusher 22. Are electrically connected.

Further, in the control unit 64, a setting input unit 66 for inputting various setting values of the product supply device and the integrated packaging machine 1 and a line unit 68 for controlling the transfer line 2 and the packaging line 4 are electrically provided. It is connected. The control unit 64 controls each of the above units based on various set values input in the setting input unit 66, and appropriately reflects the output value of a sensor or the like appropriately provided in each of the above units in the control. , Perform overall optimum control of product supply equipment.

Hereinafter, the product supply control of the present embodiment performed by the control unit 64 will be described with reference to FIGS. 5 to 9. First, as shown in FIG. 5, the elevating table 18 is positioned at the lower level position P1 in the elevating direction Y and at the standby position P5 in the transport direction X, and at this position, for example, five from the transport line 2. Receives product line B consisting of product A of. The movable holder 20 stands by at the relay level position P3 in a state where the product row B has already been received and held in the previous stage. Further, the pusher 22 is on standby at the standby position P7.

Next, as shown in FIG. 6, the elevating table 18 rises from the state of FIG. 5 to the upper level position P2 in the direction indicated by the solid arrow by the operation of the elevating unit 28. Then, the movable holder 20 at the relay level position P3 receives the product row B from the lift table 18. As a result, the movable holder 20 holds the two-tiered product row B. The elevating table 18 is brought into contact with the front end of the product row B transported by the transport line 2 until the stopper 18a rises from the lower level position P1 and is positioned at the upper level position P2. As a result, the product A stops at the stop position P9 of the transport line 2 and stands by.

Next, as shown in FIG. 7, the elevating table 18 that has delivered the product row B to the movable holder 20 operates the elevating unit 28 and the advancing / retreating unit 30 to operate the elevating unit 28 and the advancing / retreating unit 30. Begins to descend to. As the lifting platform 18 descends diagonally downward and forward, the stopper 18a is separated from the front end of the product row B in the transport direction X, and a separation distance L1 is formed between the front end of the product row B and the stopper 18a.

By adjusting the transfer speed of the transfer line 2 and the lowering speed of the elevating table 18 in advance in the control unit 64, the separation distance L1 is set to be smaller than the height H of the product A transported on the transfer line 2. There is. As a result, even if the product A at the front end of the product row B being transported on the transport line 2 is pushed out and tilted, the product A is always prevented from tipping over by the stopper 18a. At the same time, as the transport line 2 is continuously operated, the product row B is further advanced from the stop position P9 in the transport direction X. On the other hand, the movable holder 20 rises from the relay level position P3 in the direction indicated by the broken line arrow and reaches the supply level position P4 when the elevating unit operates.

Next, as shown in FIG. 8, the pusher 22 advances in the direction indicated by the alternate long and short dash arrow by operating its advancing / retreating unit and is positioned at the extrusion position P8, and the product row B of the movable holder 20 is packed in the packaging line. Extrude to the transport surface of 4. The movable holder 20 that has delivered the product row B to the packaging line 4 descends in the direction indicated by the broken line arrow and returns to the relay level position P3 when the elevating unit operates.

On the other hand, when the elevating unit 28 and the advancing / retreating unit 30 are operated, the elevating table 18 continues to descend diagonally downward and forward as shown by the solid line arrow, is at the lower level position P1, and is in the standby position in the transport direction X. It is positioned at the forward position P6, which is ahead of P5. As the lifting platform 18 further descends diagonally downward and forward, the stopper 18a is further separated from the front end of the product row B in the transport direction X, and a separation distance L2 is formed between the front end of the product row B and the stopper 18a. To.

However, since the separation distance L2 is still smaller than the height H of the product A transported on the transport line 2, the product A is prevented from tipping over by the stopper 18a. At the same time, as the transport line 2 is continuously operated, the product line B is positioned on the transport line 2 further forward from the state shown in FIG.

Next, as shown in FIG. 9, when the advance / retreat unit 30 operates, the elevating table 18 retracts in the transport direction X as shown by the solid arrow, and is positioned from the forward position P6 to the standby position P5. Even during this period, the transport line 2 is continuously operated, so that the product row B is further advanced in the transport direction X from the state shown in FIG.

The front end of the product row B at this time is positioned at the forward position P10, and is positioned forward by the forward distance L3 from the stop position P9 when the product row B is made to stand by the stopper 18a (state in FIG. 6). Be done. On the other hand, the pusher 22 returns from the extrusion position P8 to the standby position P7 by the operation of the advance / retreat unit.

As described above, in the product supply device of the present embodiment, in the process of lowering the elevating table 18 from the upper level position P2 to the lower level position P1 by the elevating unit 28, the elevating table 18 is moved to the advancing position P6 by the advancing / retreating unit 30. The control unit 64 executes the control to be performed. As a result, as shown in FIG. 9, when the elevator 18 receives the product row B of the transport line 2 at the next timing, the front end of the product row B is moved forward by a distance L3 from the stop position P9 shown in FIG. It can be positioned forward.

Therefore, the time from the transport line 2 until the product row B is completely placed on the elevating table 18 can be shortened by the time corresponding to the forward distance L3, and as a result, the transport standby time of the product row B in the transport line 2 can be shortened. It can be shortened as a whole, and the transport speed of the product A in the product supply device can be relatively increased.

Further, the control unit 64 lowers the elevating table 18 diagonally forward and downward from the upper level position P2 to the forward position P6 of the lower level position P1 by the elevating unit 28 and the advancing / retreating unit 30, and then moves to the standby position P5 by the advancing / retreating unit 30. Move. As a result, the waiting time until the product row B is completely moved to the elevating table 18 and can be ascended is shortened as compared with the case where the product row B is fully placed on the elevating table 18 at the forward position P6. can do. Therefore, the transport standby time of the product row B in the transport line 2 can be further shortened as a whole, and the transport speed of the product A in the product supply device can be further increased.

Further, the standby position P5 is located directly below the upper level position P2 in the elevating direction Y of the elevating table 18. As a result, the distance to the upper level position P2 reached by the elevating table 18 can be minimized as compared with the case where the elevating table 18 waits until the next ascent starts at the forward position P6. Therefore, the transport standby time of the product row B in the transport line 2 can be further shortened as a whole, and the transport speed of the product A in the product supply device can be further increased.

Further, in the process of raising the elevating table 18 from the lower level position P1 to the upper level position P2, the stopper 18a comes into contact with the front end of the product row B in the transport line 2 in the transport direction X. On the other hand, in the process of the elevating table 18 descending from the upper level position P2 to the lower level position P1, the stopper 18a is separated from the front end of the product line B in the transport direction X in the transport line 2 (for example, L1 in FIG. 7 and FIG. The L2) of 8 is present and separated.

By securing the separation distance L, in the process of the elevating table 18 descending from the upper level position P2 to the lower level position P1, the transport of the product A and the product row B on the transport line 2 is not hindered by the stopper 18a. As a result, in the transport line 2, the product line B can be advanced as much as possible, and the transport can be performed at the highest possible speed. Therefore, the transport standby time of the product row B in the transport line 2 can be further shortened as a whole, and the transport speed of the product A in the product supply device can be further increased.

Further, since the separation distance L is smaller than the height H of the product A, even if the product A is pushed out and tilted during transportation, the stopper 18a can prevent the product A from tipping over. .. As a result, it is possible to further increase the transport speed of the product A in the product supply device while ensuring the reliability of the product supply device.

Further, the advancing / retreating unit 30 is provided with a drive belt 50, an advancing / retreating slider 52, an advancing / retreating rail 54, etc. Controlled by. More specifically, since the advancing / retreating motor 48 is a servomotor, the separation distance L can be appropriately changed by setting the motor rotation speed when the advancing / retreating unit 30 operates in the setting input unit 66.

Therefore, by adjusting the separation distance L according to the size, shape, etc. of the product A and the product row B transported by the product supply device and the transport speed required for the product row B, the products of various products A are supplied. It is possible to realize a highly versatile product supply device while further increasing the transfer speed of the product A in the device.

Although the description of one embodiment of the present invention has been completed above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, although it is different from the form shown in FIGS. 5 to 9, both the process in which the elevating table 18 rises from the lower level position P1 to the upper level position P2 and the process in which the elevating table 18 descends from the upper level position P2 to the lower level position P1. In the transfer line 2, the stopper 18a may be brought into contact with the front end of the product row B.

Such adjustment is possible by adjusting the transport speed of the transport line 2 by the line unit 68 and the moving speed of the lifting platform 18 by the drive unit 24. As a result, even when the elevating table 18 descends from the upper level position P2 to the forward position P6 of the lower level position P1, the stopper 18a comes into contact with the front end of the product row B on the transport line 2, so that the stopper It is possible to more reliably prevent the product A transported on the transport line 2 from tipping over by 18a. Therefore, it is possible to further increase the transport speed of the product A in the product supply device while further ensuring the reliability of the product supply device.

Further, in the product supply device of the present embodiment, the product rows B are stacked in two stages, held by the movable holder 20 and supplied to the packaging line 4, but the present invention is not limited to this, and the product row is not provided without the movable holder 20. B may be stacked in one stage or in a plurality of stages in the previous step, the supply level position P4 may be set as the upper level position P1, and the elevating table 18 may be directly raised to the supply level position P4 to supply the product line B.

Further, a front end stopper (not shown) may be provided at the front end of the transport direction X in the standby position P5 of the product row B of the transport line 2. In this case, the front end stopper and the lift 18 need to have a shape that does not interfere with each other on the same horizontal plane.
Further, the product supply device of the present embodiment is not limited to the integrated packaging machine 1, and can be used for various product supply applications.

2 Transport line (1st transport line)
4 Packaging line (second transport line)
18 Lifting platform 18a Stopper 28 Lifting unit 30 Advance / retreat unit 48 Advance / retreat motor (motor)
50 Drive belt (adjustment mechanism)
52 Advance / retreat slider (adjustment mechanism)
54 Advance / retreat rail (adjustment mechanism)
64 Control unit P1 Lower level position P2 Upper level position P5 Standby position P6 Forward position
A product
B product line
H Product height
L separation distance
X transport direction
Y Ascending / descending direction

Claims (3)

A plurality of products transported in the transport direction on the first transport line are stopped to form a product row, and the product row is located above the first transport line from the first transport line during this stop. A product supply device that supplies to the second transport line.
It can be raised and lowered between the lower level position and the upper level position, and after receiving the product line from the first transport line at the standby position in the transport direction of the lower level position, it rises to the upper level position. Lifting platform and
An elevating unit that elevates and elevates the elevating platform between the lower level position and the upper level position.
An advancing / retreating unit that advances or retracts the elevating platform between the standby position and the advancing position in the transport direction.
A product supply device including a control unit for moving the elevating table to the advancing position by the advancing / retreating unit in a process of lowering the elevating table from the upper level position to the lower level position by the elevating unit. The lift has a stopper that extends toward the first transport line and stops a plurality of the products transported in the transport direction on the first transport line to form the product line.
The stopper contacts the front end of the product line in the first transport line in the transport direction in the process of ascending the lift from the lower level position to the upper level position, while the stopper is in contact with the front end of the product row from the upper level position to the lower level. The product supply according to claim 1, wherein in the process of descending to the level position, the front end of the product row in the transport direction in the first transport line is separated by a separation distance smaller than the height of the product. apparatus. The advance / retreat unit
An adjustment mechanism that can adjust the separation distance,
The product supply device according to claim 2, further comprising a motor that controls the adjustment mechanism based on a command of the control unit.

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