JP2011001075A - Packaging device winding body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging device winding a body adaptable for the shape, the weight or the like of a variety of kinds of containers with lid.SOLUTION: In the packaging device winding a body, when conveying a container placed on a container conveying passage 2a of a conveyor, a heat-shrinkable film stretched across the container conveying passage 2a is wound around the side surface of the container, and the seal cut is executed at a rear part of the container. The packaging device winding a body has a changing means capable of making a change whether or not a push-feeding member 10 for push-feeding the rear part of the container abutted on the stretched film is allowed to appear in a push-feeding area on the container conveying passage 2a according to the kind of the container.

Description

  The present invention relates to a body-wrapping machine for body-wrapping a side surface of a container with a heat-shrinkable film.

  In a container with a lid such as a lunch box sold at a convenience store, etc. Increased usage. Therefore, from the viewpoint of environmental problems such as garbage and packaging costs, simple packaging that reduces the amount of film used is required. Then, the body winding packaging using the body winding packaging machine etc. which were disclosed by patent document 1 is performed. In this body wrapping, a belt-like heat-shrinkable film is supported so as to cross the container transport path between support rollers on both sides in the lateral direction, and the film is wound around the entire side of the container as the container is transported. Both the sealing members are heat-sealed and cut and wound. After that, the body-wound film was folded on the upper surface of the container and was in close contact with the container by heat treatment. Since the amount of film used is increased even in such wrapping packaging, a belt-shaped heat-shrinkable film is wound only on the joint between the container body and the lid on the side of the container, and the joint is sealed. We are studying simple packaging to reduce the amount of food.

Japanese Utility Model Publication No. 6-9924

Since the shape, size, weight, and the like of containers differ depending on the type, provision of a body-wrapping machine that can handle the shape, size, weight, etc. of various types of containers is required.
For example, depending on the type of product, a container with a light weight or a container with a shape that is easy to tip over due to its narrow bottom and high center of gravity is used, and a film is wound around the joint between the container body and the lid in such a container. If too much tension is applied to the film, the resistance due to the tension of the film may cause the sealing member to bite into the container without being transported, or the container will easily fall over. On the other hand, if the tension of the film is released too much in order to prevent the biting or overturning, the film that should surround the joint while coming into contact with the joint between the container body and the lid falls off the container.

  An object of the present invention is to provide a body-wrapping machine that can cope with the shape, weight, and the like of various types of lidded containers when body-wrapping.

  The body-wrapping machine according to the invention of claim 1 is a heat-shrinkable film 7 stretched across the container transport path 2a when transporting the container 3 placed on the container transport path 2a of the conveyor 1. Is wound around the side surface 3 a of the container 3, and the seal is cut behind the container 3, and the pushing member 10 that pushes the back of the container 3 in contact with the stretched film 7 is selected according to the type of the container 3. There is provided a switching means capable of switching whether or not to appear in the push area on the container transport path 2a.

In the invention of claim 2 based on the invention of claim 1, the pushing member 10 pushes the container 3 at a moving speed synchronized with the speed of the conveyor 1.
In the invention of claim 3 based on the invention of claim 1 or claim 2, a conveyor belt 2 is arranged in parallel on the conveyor 1, and a pushing member 10 is provided from an opening 2b provided between the conveyor belts 2. Appears in the feed area.

  The invention according to claim 4, which presupposes any one of the inventions according to claims 1 to 3, includes a plurality of driving means 32, 28, and pushes the container 3 by the pushing member 10 by driving of one driving means 32. Then, the pushing member 10 is caused to appear in the pushing area on the container transport path 2a by driving another driving means 28.

  In the invention of claim 5 which presupposes any one of the inventions of claims 1 to 4, the time for moving the pushing member 10 from the upstream retracted position in the container conveying direction to the downstream side is set back from the downstream side. The time for returning to the position is set short.

  In the invention of claim 6, which presupposes any one of the inventions of claims 1 to 5, the height of the pushing member 10 that appears in the pushing area can be adjusted steplessly.

  In the invention of claim 1, the container is wound on the side of the container only when the film is wound around the joint portion of the container body and the lid so that the joint is sealed and the amount of film used is reduced. When the selection switching for causing the pushing member to appear in the pushing area on the conveyance path is performed, for example, a container having a light weight or a container having a shape that is easy to fall down due to a narrow bottom and a high center of gravity position. When the seam between the container body and the lid comes into contact with the film, the feeding member that appears in the feeding area continues to push the back of the container even if the tension of the film is somewhat high. It is possible to prevent the container from falling or to prevent the container from overturning. For this reason, it is not necessary to release the tension of the film excessively, and the film does not fall off from the container when the film is brought into close contact with the joint of the container.

  The shape of a simple lunch box or other container with a lid varies depending on the type. Depending on the type, it may be preferable not to make the pushing member appear because the pushing member pushes the inclined portion of the container so that the container rides on the pushing member. For a container having such a shape, it is effective to perform selection switching so that the pushing member does not appear in the pushing area by the switching means.

Therefore, it is possible to provide a body-wrapping machine that can cope with the shape and weight of various types of lidded containers even when body-wrapping.
In the invention of claim 2, since the pushing member pushes the container at a moving speed synchronized with the speed of the conveyor, it is possible to prevent the container placed on the container conveying path from being overturned or displaced.

  In the invention of claim 3, since the pushing member is arranged in the space below the conveyor so that the pushing member appears in the pushing area on the container carrying path from the opening provided between the carrying belts, Can be configured compactly.

  In the invention of claim 4, since the pushing member appears on the container conveyance path using different driving means, the timing for causing the pushing member to appear on the container conveyance path can be freely changed.

  In the invention of claim 5, since the time for returning the pushing member to the retracted position is shortened, when the container is continuously transported, the intermittent time at the time of transport is shortened to shorten the packaging processing time per packaging. Is possible.

  In the invention of claim 6, since it becomes possible to change the height of the pushing member appearing on the container conveyance path, for example, when only the lower part of the side surface of the container is inclined with respect to the vertical direction, the inclination thereof By changing the height of the pushing member so that the pushing member does not hit the surface, the pushing member does not push the inclined portion of the container, and it is possible to prevent the container from riding on the pushing member.

It is a top view which shows a part of body winding packaging machine roughly. It is a front view which shows roughly the film support mechanism of a body winding packaging machine. It is a side view which shows roughly the container feeding mechanism of a body winding packaging machine. (A) (b) (c) is a top view which shows the effect | action of the film support mechanism and sealing mechanism of a body winding packaging machine, respectively, (d) is a partially notched front view which shows the packaged lidded container.

The body wrapping machine of this embodiment can be used for various types of containers having various shapes, sizes, weights, and the like.
As shown in FIG. 1, the conveyor 1 includes a supply conveyor 1A and a discharge conveyor 1B. A pair of endless conveying belts 2 are provided between the supply conveyor 1A and the discharge conveyor 1B. Arranged in parallel, an opening 2 b is provided between the conveyor belts 2. A container 3 is placed on the container transport path 2a on the transport belt 2 and transported in the direction of the arrow along the container transport direction (front-rear direction).

  Near the boundary between the supply conveyor 1A and the discharge conveyor 1B, there is a film support mechanism 4 and a seal mechanism 5 so as to be close to the film support mechanism 4 downstream of the film support mechanism 4 in the container transport direction. A container detection sensor 6 that detects the container 3 that is transported through the container transport path 2a is disposed upstream of the film support mechanism 4 in the container transport direction.

  The downstream ends of the two conveyor belts 2 of the supply conveyor 1A and the upstream ends of the two conveyor belts 2 of the discharge conveyor 1B approach the seal member 27 when a seal member 27 of a seal mechanism 5 described later approaches each other. It is comprised so that it may mutually space apart along a container conveyance direction according to a separation operation | movement.

  On both sides of the supply conveyor 1A across the container conveyance path 2a in the left-right direction (lateral direction orthogonal to the front-rear direction), a film guide mechanism 8 for supplying a belt-like heat-shrinkable film 7 to the film support mechanism 4 is provided. It is arranged.

  A feeding member 10 of a container pushing mechanism 9 (described later) appears in the container conveying path 2a from an opening 2b between the two conveying belts 2 in a predetermined range upstream of the downstream ends of both conveying belts 2 of the supply conveyor 1A. When the container 3 is pushed toward the downstream side in the container conveying direction and moved to a predetermined range downstream from the upstream end portions of the two conveying belts 2 of the discharge conveyor 1B, the container 3 descends from the container conveying path 2a and is hidden. It has become.

  A shrink tunnel (not shown) is installed on the downstream side of the discharge conveyor 1B in the container transport direction, and the container 3 wrapped by the heat-shrinkable film 7 is passed through as shown in FIG. 4 (d). It becomes possible to obtain a packaged product in which the film 7 is in close contact with the seam 38 of the container body 23 and the lid 24 on the side surface 3a of the container 3 and is sealed.

Next, the film support mechanism 4 will be described with reference to FIG.
The base 11 is supported by a body frame (not shown) so as to extend in a lateral direction intersecting the container transport direction at a position below the container transport path 2a. A pair of guide rods 13 are installed horizontally in the horizontal direction between support plates 12 erected on both sides of the table 11 in the horizontal direction. Further, a male spiral bar 14 is rotatably supported in a lateral direction between the support plates 12 in parallel with the guides 13 and the male spiral bar 14 rotates the servo motor 15 shown in FIG. Receive and rotate. The male spiral rod 14 is formed with a left-hand thread 14a on one side in the lateral direction across the container transport path 2a of the conveyor 1, and a right-hand spiral 14b on the other side. The left thread 14a and the right spiral 14b are respectively screwed with the female spiral cylinder 16. The female spiral cylinder 16 is attached to the movable plate 18 together with the guide cylinder 17 fitted on the guide rod 13. For this reason, the movable plate 18 is supported by the male spiral rod 14 and the guide rod 13 on both the left and right sides of the container transport path 2a, and the male spiral bar 14 rotates so that the movable transport plate 18 is mutually relative to the container transport center of the container transport path 2a. While approaching, it leaves | separates according to rotation of the servomotor 15, and returns to the original position as an operation | movement start position.

  A base plate 18a which is a part of the movable plate 18 supports an elevating table 19 so as to be movable in the vertical direction. The elevating table 19 supports the supporting roller 20 and the guide in order from the container conveying path 2a in the lateral direction. The rollers 21 and 22 are installed so as to extend in the vertical (vertical) direction. The height of the support roller 20 and the guide rollers 21 and 22 can be adjusted by moving the elevator 19 in the vertical direction. For example, the container body 23 and the lid 24 of the container 3 shown in FIG. The height of the support roller 20 and the guide rollers 21 and 22 can be adjusted with respect to the container 3 so that the side surface 3a of the container 3 is packaged only at the place where the two are joined.

  Next, the film guide mechanism 8 shown in FIG. 1 includes a film supply source 25, a guide roller 26a, a feeding roller 26b, a rubber roller 26c, and a tension roller 26d. The feed roller 26b is driven by a servo motor (not shown) to rotate, thereby drawing the film 7 from the film supply source 25. When the rotation of the servo motor stops, the film supply source 25 is configured to be braked. The drawn film 7 is wound in a zigzag shape by the rollers 26 a, 26 b, 26 c and 26 d, and is then wound around the guide roller 22 of the film support mechanism 4.

  The rollers 26a, 26b, 26c, and 26d of the film guide mechanism 8 and the film supply source 25 are supported so as to be movable in the vertical direction. The rollers 26a, 26b, 26c, and 26d of the film guide mechanism 8 and the film support mechanism 4 are supported. Each of the rollers 20, 21, and 22 is adjusted in height so as to support the film 7 at the same height position that is spaced apart from the container transport path 2 a by a predetermined distance. In order to prevent the film 7 from falling off, the lower ends of the rollers 26a, 26b, 26c, 26d, 20, 21, 22 are formed in a bowl shape. The tension roller 26d is moved to the lateral guide roller 26a side by a driving means (not shown) at the timing when the support roller 20 (described later) winds and guides the film 7 around the side surface 3a of the container 3 in the middle of conveyance. The tension is reciprocated in the lateral direction so that the tension can be adjusted to be relatively looser than the film stretched state immediately before the container 3 comes into contact with the film 7.

  In the seal mechanism 5 shown in FIG. 1, a pair of seal members 27 are disposed on both sides in the lateral direction sandwiching the container transport path 2 a on the downstream side of the support rollers 20 in the container transport direction. The seal members 27 can be moved toward and away from each other in the lateral direction with respect to the container conveyance center of the container conveyance path 2a. Even if the height of the film 7 is changed by the film support mechanism 4 and the film guide mechanism 8, the film 7 It has a predetermined length in the vertical direction so that it can be cut while being heat-sealed.

Next, the container pushing mechanism 9 will be described with reference to FIG.
A guide rail 29 (guide member) is supported on an air cylinder 28 attached to a main body frame (not shown). The guide rail 29 extends below the both conveying belts 2 along the opening 2b shown in FIG. 2, and is moved upward by operating an air cylinder 28 (drive means) by drive control means (not shown). Take P and lowered position Q. A single slider 30 is movably supported on the guide rail 29. The pushing member 10 is attached to the slider 30 and the articulated link mechanism 31 is rotatably connected.

  The multi-joint link mechanism 31 includes a drive lever 34, a driven lever 36, and an interlocking link 37. The drive lever 34 and the driven lever 36 are pivotally supported at their one end portions 34a and 36a so as to be rotatable on a body frame (not shown). A cam roller 34 b is attached to the other end side of the drive lever 34, and the cam roller 34 b is disposed in the cam groove 36 b of the driven lever 36.

  The servo motor 32 (drive means) is supported by a main body frame (not shown), and is rotationally driven only in one direction (the direction of the arrow) by a drive control means (not shown). When the servo motor 32 rotates, the drive lever 34 rotates in one direction (the direction of the arrow) around the one end 34a. For this reason, the multi-joint link mechanism 31 indicated by the solid line in FIG. 3 moves to the position indicated by the two-dot chain line when the drive lever 34 rotates by 2/3 rotation in the direction of the arrow, and further rotates by 1/3 rotation. Then, it returns to the original position. Thus, when the drive lever 34 rotates 2/3 times, the guide rail 29 is placed at the raised position P, and the pushing member 10 appears on the container conveyance path 2a from the opening 2b between the conveyance belts 2, The pushing member 10 advances linearly from the upstream side to the downstream side of the container transport path 2a along the opening 2b. The pushing member 10 is driven to move at a moving speed synchronized with the speed of the conveyor 1. When the drive lever 34 remains to rotate 1/3 round, the guide rail 29 is placed at the lowered position Q, and the pushing member 10 is retracted from the container transport path 2a, and then downstream of the container transport path 2a along the opening 2b. Retreat linearly from side to upstream. Such driving of the air cylinder 28 and the servo motor 32 is performed when the driving unit is switched to a driving setting state by a switching unit described later. When the pushing member 10 moves backward along the opening 2b, the pushing member 10 returns to the most upstream position (retracted position) in the container transport direction at a double speed when moving forward.

Next, each operation timing when the container 3 comes into contact with the film 7 stretched across the container conveyance path 2a and is guided to the support roller 20 will be described.
When the container 3 is detected by the container detection sensor 6 when the container 3 in the middle of conveyance is positioned on the upstream side in the container conveyance direction with respect to the stretched film 7, the drive control means (not shown) Based on the conveyance speed, the operation timings of the servo motor (not shown) of the feeding roller 26b and the driving means (not shown) of the tension roller 26d are obtained from the relationship with the timing at which the container 3 contacts the film 7.

  The drive control means (not shown) includes a servo motor 15 that moves the support rollers 20 closer to and away from each other, a servo motor (not shown) that moves the seal members 27 closer to and away from each other, and a reciprocating movement of the pushing member 10 in the vertical direction. Each operation timing (operation start timing, operation stop timing), each operation speed, an operation start position, etc. of the air cylinder 28 and the servo motor 32 that reciprocates the pushing member 10 in the container transport direction are set in advance. These are driven and controlled by the detection of the container 3 by the container detection sensor 6. The drive control means (not shown) includes switching means (not shown) that can selectively switch whether or not the pushing member 10 appears on the container transport path 2a according to the type of the container 3. These settings can be changed by the operator in accordance with the container conveyance speed, the size of the container 3, and the like.

  The drive control means (not shown) drives and controls the air cylinder 28 according to the selection switching state by the switching means (not shown), or the drive setting capability state in which the push member 10 appears on the container transport path 2a, or push feed The stop setting state in which the member 10 does not appear on the container conveyance path 2a is set, and the drive of the servo motor 32 is stopped in the stop setting state.

The movement of the pushing member 10 and the movements of the support roller 20 and the seal member 27 when being switched to the drive setting state by the switching means will be described with reference to FIGS.
Before the container 3 comes into contact with the film 7, the container detection sensor 6 detects the container 3, and as shown in FIG. 3, the pushing member 10 is lifted from the lowered position Q by driving the air cylinder 28 (driving means). It rises to a position P, appears in a region (pushing region) that can contact the back of the container 3 in the vertical and horizontal directions on the container conveyance path 2a, and is downstream in the container conveyance direction by driving the servo motor 32 (drive means). (See FIG. 4A). At this time, the pair of support rollers 20 are stopped at a standby position that is the farthest away from each other, and the pair of seal members 27 that are close to the support rollers 20 on the downstream side in the container transport direction are further than the support rollers 20. Stopped at the standby position to be separated.

  After the container 3 comes into contact with the film 7, the container 3 continues to be pushed by the pushing member 10 until it advances slightly downstream from the film support mechanism 4 against the reaction force of the film 7. The pair of support rollers 20 approach each other to a position narrower than the lateral width S of the container 3, and the film 7 is wound and guided around the side surface 3a of the container 3 (the portion of the seam 38 between the container body 23 and the lid 24) (FIG. 4 (b)).

When the pushing member 10 further pushes the container 3 with this bear, the pushing member 10 is lowered by the air cylinder 28 to the lowered position Q (see FIG. 3).
Slightly later than the lowering timing, the pair of seal members 27 approach each other, heat seal with the film 7 interposed therebetween, cut the film 7 with a knife (not shown), and wind the container 3 (FIG. 4 ( c)). At this time, the drawing of the film 7 by the feeding roller 26b is stopped.

  Thereafter, the pushing member 10 is returned to the upstream retracted position in the container transport direction while being kept at the height of the lowered position Q, and the pair of seal members 27 are separated from each other to release the film 7, Together with the support roller 20, each returns to the standby position. At this time, the film 7 is stretched again in the stretched state.

This embodiment has the following effects.
* On the side surface 3a of the container 3, the film 7 is wrapped only around the seam 38 between the container body 23 and the lid 24 to seal the seam 38, so that simple body-wrapping that reduces the amount of film 7 used is performed. When the selection switching for causing the pushing member 10 to appear in the pushing area on the container conveying path 2a is performed, for example, the container 3 having a light weight, the container 3 having a shape that is easy to fall because the bottom is narrow and the center of gravity is high, and the like. Even when the seam 38 between the container main body 23 and the lid 24 of the container 3 abuts against the film 7, even if the tension of the film 7 is somewhat high, the pushing member 10 that appears in the container transport path 2a is Since 3 is continuously pushed toward the downstream side in the container conveying direction, the container 3 can be prevented from being bitten into the seal member 27 or the like, or the container 3 can be prevented from being overturned. For this reason, it is not necessary to release the tension of the film 7 excessively, and when the film 7 is brought into close contact with the joint 38 of the container 3, the film 7 does not fall off from the container 3. Therefore, it is possible to provide a body wrapping machine that can cope with the shape and weight of various types of lidded containers even when performing simple body wrapping.

  * The shape of containers such as lunch boxes and other containers with lids varies depending on the product type. Depending on the type, it may be preferable not to make the pushing member 10 appear because the pushing member 10 pushes the inclined portion of the container 3 and the container 3 gets on the pushing member 10. For the container 3 having such a shape, it is effective to perform selection switching so that the pushing member 10 does not appear in the container transport path 2a by the switching means.

* Since the pushing member 10 pushes the container 3 at a moving speed synchronized with the speed of the conveyor 1, it is possible to prevent the container 3 placed on the container conveying path 2a from being overturned or displaced.
* Since the pushing member 10 is disposed in the space below the conveyor 1 so that the pushing member 10 appears in the pushing area on the container carrying path 2a from the opening 2b provided between the carrying belts 2, The machine can be configured compactly.

  * In addition to the drive means (servo motor 32) for pushing the container 3 as drive means for the push member 10, the drive means (air cylinder 28) for causing the push member 10 to appear in the push area is provided. It is possible to freely change the setting of the timing at which 10 appears.

  * The time required for the multi-joint link mechanism 31 to return the pushing member 10 to the retracted position along the guide rail 29 from the time required to move the pushing member 10 linearly along the guide rail 29 to the downstream side in the container transport direction. Therefore, when the container 3 is continuously transported, the intermittent time during transport can be shortened, and the packaging processing time per package can be shortened.

  * Since the container feeding mechanism 9 is arranged in the space below the conveyor 1 so that the pushing member 10 appears in the feeding amount area from the opening 2b provided between the conveying belts 2, the body wrapping machine is made compact. It becomes possible to configure.

For example, the following embodiment may be configured as follows.
In the present embodiment, the pair of seal members 27 are brought closer to each other with a slight delay after the pushing member 10 is lowered to the lowered position Q. However, depending on the type of the container 3 and the like, for example, a pair of seals Various timings for lowering the pushing member to the lowered position Q may be set, for example, setting the timing so that the pushing member contacts the rear of the container until the member 27 is heat-sealed. Further, the timing at which the push member is raised from the lowered position Q to the raised position P may be variously set according to the type of the container.

  In the present embodiment, the pushing member 10 appears in the pushing area on the container conveying path 2a from below the container conveying path 2a in the vertical direction, but the pushing member is separated from the pushing area above or on the side of the container conveying path. The pushing member may be moved back and forth in the pushing area in accordance with the type of container having a different shape or weight.

  -In this embodiment, although the surface of the pushing member 10 contact | abutted at the back of the container 3 is formed flat, concave shape may be sufficient, for example. Moreover, you may make it make a several feed member appear in a push area | region, such as supporting the back of a container in two places. If the container can be pushed, the form and the like of the pushing member are not specified.

  In the present embodiment, the switching means can perform selection switching by two choices of whether or not the pushing member 10 appears in the pushing area on the container transport path 2a. Thus, if the height position of the push member is controlled such that the push member is moved up and down by a servo motor, the height of the push member appearing in the push region can be adjusted steplessly. In addition, the height position of the container conveyance path of the conveyor can be made variable, and the height of the push member appearing in the push area can be adjusted steplessly. For example, when only the surface of the lower part of the side surface of the container is an inclined surface that is inclined with respect to the vertical direction, if the height of the pushing member is changed so that the inclined member does not hit the inclined surface, It is possible to prevent the rider from leaning.

  In the present embodiment, the multi-joint link mechanism 31 shortens the time for returning from the downstream side to the retracted position rather than the time for moving the pushing member 10 from the upstream retracted position in the container transport direction to the downstream side. Although the packaging processing time per packaging is shortened, the time for returning from the downstream side to the retracted position may be shortened by an electric control means such as changing the speed of the servo motor 32.

  A fusing seal that cuts while melting and sealing the film by using a blade heated to an appropriate temperature instead of the sealing member 27 that is heated and cut with a knife may be used.

  DESCRIPTION OF SYMBOLS 1 ... Conveyor, 2 ... Conveyor belt, 2a ... Container conveyance path, 2b ... Opening, 3 ... Container, 3a ... Side surface of container, 7 ... Film, 10 ... Pushing member, 28 ... Air cylinder (drive means), 32 ... Servo Motor (driving means).

Claims (6)

  When transporting containers placed on the container transport path of the conveyor, a body winding that wraps a heat-shrinkable film stretched across the container transport path around the side of the container and seals and cuts it behind the container A wrapping machine, comprising switching means capable of switching whether or not a feeding member that pushes the rear of a container in contact with a stretched film appears in a feeding area on a container conveying path according to the type of the container. A body-wrapping machine characterized by that.   The body-wrapping machine according to claim 1, wherein the pushing member pushes the container at a moving speed synchronized with the speed of the conveyor.   3. The body wrapping machine according to claim 1, wherein a conveyor belt is arranged in parallel on the conveyor, and a feeding member is caused to appear in the feeding area from an opening provided between the conveyor belts. .   A plurality of driving means are included, the container is pushed by the pushing member by driving one driving means, and the pushing member is caused to appear in the pushing area on the container conveying path by driving another driving means. The body-wrapping machine according to any one of the three.   The time for returning from the downstream side to the retracted position is set shorter than the time for moving the pushing member from the upstream retracted position in the container transport direction to the downstream side. The body winding packaging machine as described in one.   The body-wrapping machine according to any one of claims 1 to 5, wherein the height of the feeding member that appears in the feeding region can be adjusted steplessly.

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