TWI889071B - Sheet separation device and sheet separation method - Google Patents

Abstract

A sheet separation device is provided, which can separate sheets one by one from stacked sheets accurately and at high speed. The sheet separation device (1) comprises: a first suction machine (10A) and a second suction machine (10B) for sucking and lifting the top sheet of the stacked sheets stacked on a loading portion, and lifting and separating the sucked top sheet relative to the stacked sheets; a separation portion (A) for separating the stacked sheets; and a transfer portion (B) for conveying and transferring the separated sheets to a post-processing device. The first suction machine (10A) and the second suction machine (10B) are respectively arranged on the separation part side and the delivery part side, and are repeatedly moved between the separation part and the delivery part through a conveying mechanism. Furthermore, the conveying mechanism is controlled in such a way that when one of the first suction machine (10A) and the second suction machine (10B) separates the sheet at the separation part and moves to the delivery part, the other suction machine moves to the separation part (A).

Description

Sheet separation device and sheet separation method

The present invention relates to a sheet separation device and a sheet separation method, which separates the loaded sheets one by one.

In the past, there is a known sheet separation device that separates sheets in a stacked state (for example, sheets formed into a bag shape) one by one and conveys them to another device. This sheet separation device conveys the separated sheet to a post-processing device (for example, a label attaching device, etc.) disposed downstream thereof. However, when the aforementioned sheet is made of plastic and thin, it has the property of being electrostatically charged. When separating the top sheet from the stacked sheets, the bags are closely attached to each other due to the aforementioned static electricity and are difficult to peel off.

For example, Patent Document 1 discloses a sheet separation device that can reliably separate sheets from stacked sheets. Referring to FIG. 11 and FIG. 12, the general process of sheet separation of the sheet separation device disclosed in Patent Document 1 is described.

Initially, the front side of the topmost sheet 200 of the stacked sheets placed on the loading portion is sucked and lifted by the suction machine 201. Then, the suction machine 201 rotates the lifted sheet 200 approximately 180° and conveys it (Figure 11(a) to (c)). At this time, the suction machine 201 rotates, and the sucked and lifted sheet 200 is separated in a manner of being lifted relative to the stacked sheets. That is, only by moving the suction machine in the stacking direction (vertical direction), it is difficult to separate only one sheet because the first sheet and the second sheet attract each other on the entire surface due to static electricity, etc., but by rotating the suction machine, a linear resistance is formed between the first sheet and the second sheet, and one sheet can be easily separated.

Then, the lifted sheet 200 is transported to a downstream position by the rotationally driven suction machine 201 in a state of being reversed by approximately 180°, and is transferred to a post-processing device (not shown) at this position (Figure 11(d)). Thereafter, the suction machine 201 is driven in the reverse direction (Figure 12(a)~(c)) and returns to the initial position shown in Figure 11(a) to perform a piece-by-piece separation of the next sheet (Figure 12(d)).

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 7106737

In the above-mentioned method of separating sheets using a suction machine, the suction machine separates the sheets at the initial position, then rotates approximately 180 degrees and transports them to the transfer position on the downstream side and transfers them to the post-processing device, and then returns to the initial value. In this way, since the suction machine is reciprocated between the initial position and the transfer position, there is a limit to the high-speed separation process of the sheets.

The present invention is made based on the above-mentioned problem, and its purpose is to provide a sheet separation device and a sheet separation method, which can accurately separate sheets one by one from stacked sheets and perform high-speed processing.

In order to achieve the above-mentioned purpose, the sheet separation device according to the present invention is characterized in that it has: a loading portion for loading stacked sheets; a first suction machine and a second suction machine for sucking and lifting the top sheet of the stacked sheets stacked on the loading portion, and lifting and separating the sucked top sheet relative to the stacked sheets; a separation portion for separating the stacked sheets; and a conveying portion for conveying the separated sheets. The first suction machine and the second suction machine are respectively arranged on the side of the separation part and the side of the delivery part, and are repeatedly moved between the separation part and the delivery part through a conveying mechanism, and the conveying mechanism is controlled in such a way that when one of the first suction machine and the second suction machine separates the sheet at the separation part and moves to the delivery part, the suction machine of the other one moves to the separation part.

In the above-mentioned sheet separation device, a suction machine is used to suck and lift the topmost sheet of the stacked sheets placed on the placement portion, while separating the sheets by lifting them relative to the stacked sheets. In addition, the separation of the sheets is continuously performed by the aforementioned first suction machine and the second suction machine, and when one of the aforementioned first suction machine and the second suction machine separates the sheets from the aforementioned separation portion and moves to the aforementioned transfer portion, the suction machine of the other one moves toward the aforementioned separation portion. Therefore, compared with a reciprocatingly driven suction machine, the sheet separation process will be shortened, and the sheet separation process can be performed at a high speed.

Furthermore, the sheet separation method according to the present invention is characterized by comprising: a separation process, in the separation section, the top sheet is sucked and lifted relative to the stacked sheets, and the sucked top sheet is lifted and separated relative to the stacked sheets; a conveying process, conveying the lifted and separated sheet; and a transfer process, conveying the sheet conveyed in the conveying process to the transfer section of the post-processing device; wherein the separation process is to continuously perform sheet separation through a first suction machine and a second suction machine arranged along an endless track; and the transfer process is to convey the suction machine of the other suction machine to the separation section when one of the first suction machine and the second suction machine is conveyed to the transfer section.

According to this sheet separation method, the first suction machine and the second suction machine can be used to continuously separate the sheets and transfer the separated sheets to the post-processing device, so the sheet separation process can be performed at a high speed.

According to the present invention, a sheet separation device and a sheet separation method can be obtained, which can accurately separate sheets one by one from stacked sheets and perform high-speed processing.

1: Sheet separation device

2: Base

3: Loading part

5: Push drive device

12: Support shaft

15: Sheet separation mechanism

20: No End Track

21:Guide rails

22: Pulley

23: Carrying body

25: Transport box

30: Inhalation mechanism

31: Shell

32: Spray nozzle

50: Control box

60: Support plate

61: Recess

65: Transport roller

200: Sheet

201: Suction machine

10a: Attraction pad

10A, 10B: Suction machine

10d: Nozzle

15A: flange

20A: bend

20B: Linear motion part

21a:Joint groove

25a: Rotating body

A: Separation section

B: Delivery Department

S: Sheet

S1: Sheet

[Figure 1] is a schematic three-dimensional diagram of an embodiment of the sheet separation device according to the present invention, viewed from the front side.

[Figure 2] is a schematic three-dimensional diagram of an embodiment of the sheet separation device according to the present invention, viewed from the rear side.

[Figure 3] is a side view of the sheet separation device shown in Figures 1 and 2.

[Figure 4] is a top view of the sheet separation device shown in Figures 1 and 2.

[Figure 5] is a front view of the sheet separation device shown in Figures 1 and 2.

[Figure 6 (a) to (d)] are diagrams sequentially showing the operation of the suction machine (suction pad) in the sheet separation section.

[Figure 7] is a schematic diagram showing the state where the separated and lifted sheet is conveyed to the conveying section.

[Figure 8 (a) to (c)] are schematic diagrams showing the sheet separation process and conveying process.

[Figure 9] is a schematic diagram showing the separation state of the sheet by the suction pad.

[Figure 10] is a schematic diagram showing the transfer state of the sheet by the suction pad.

[Figure 11 (a) to (d)] is a schematic diagram showing the conventional sheet separation process.

[Figure 12 (a) to (d)] is a schematic diagram showing the next sheet separation process after the sheet separation process of Figure 11 is completed.

Below, an implementation method of the sheet separation device according to the present invention will be specifically described according to the attached drawings.

Figures 1 to 5 are diagrams showing an embodiment of the sheet separation device according to the present invention, Figure 1 is a schematic three-dimensional diagram viewed from the front side, Figure 2 is a schematic three-dimensional diagram viewed from the rear side, Figure 3 is a side view, Figure 4 is a top view, and Figure 5 is a front view. In addition, in the figure, the X direction is defined as the conveying direction of the sheet (front-back direction), the Y direction is defined as the direction orthogonal to the conveying direction of the sheet (width direction), and the Z direction is defined as the stacking direction of the sheet (up-down direction).

The sheet separation device 1 according to the present embodiment is provided with a base (frame) 2 and a loading portion 3 provided on the base 2. The loading portion 3 is arranged to be movable in the up and down direction (Z direction) through a push drive device 5 provided on the base 2. On the loading portion 3, a plurality of thin sheets (thin bags, films, papers, etc. formed of nylon, etc.) are stacked (the stacked sheets are represented by S), forming a structure suitable for sequentially separating one sheet at a time from the top. The top sheet S1 separated here (refer to Figures 7 to 10) is conveyed to a post-processing device (for example, a labeling device, a welding device, etc.) not shown in the figure.

The sheet separation device 1 comprises: a suction machine 10A for sucking and lifting the stacked sheets S on the loading portion 3; and a sheet separation mechanism 15, which is arranged to face the edge (one end) of the stacked sheets S. The sheet separation mechanism 15 may be of various known configurations, such as a circular flange 15A, which is in close contact with and presses the top sheet S1 of the stacked sheets S on the loading portion 3. That is, the top sheet S1 of the stacked sheets S is pressed against the arc area of the flange 15A, and when the top sheet S1 is sucked up by the suction machines 10A and 10B, the sheet S1 will be separated, thereby preventing the second and subsequent sheets from being connected and rising. In addition, the sheet separation mechanism 15 can also be coupled to the two sides of the stacked sheets S to provide a separation effect.

The aforementioned suction machine 10A is arranged in a plurality (six in this embodiment) at predetermined intervals along the Y direction on one end side of the stacked sheet S, and is supported by a support shaft 12 described later.

The sheet separation device 1 according to the present invention is provided with a pair of suction machines and support shafts of the above-mentioned structure.

In the following description, the state shown in the figure is regarded as the initial position, the suction machine located on the upper side of the mounting portion 3 is referred to as the first suction machine 10A, and the suction machine located on the lower side of the mounting portion 3 is referred to as the second suction machine 10B.

The first suction machine 10A and the second suction machine 10B are separately arranged at the initial position on the separation part A side for separating the sheets and the transfer part B side for transferring the sheets, and each suction machine is repeatedly moved between the separation part and the transfer part (moving in only one direction) through a conveying mechanism. In addition, the conveying mechanism for moving the first suction machine 10A and the second suction machine 10B is controlled so that when one of the first suction machine 10A and the second suction machine 10B separates the sheets in the separation part A and moves to the transfer part B, the suction machine of the other is moved to the separation part A. Furthermore, each supporting shaft 12 of the first suction machine 10A and the second suction machine 10B is driven to rotate around the central axis in a manner to separate the sheets.

At the front end of each suction machine 10A, 10B, a suction pad 10a is provided, which is in close contact with the surface of the top sheet S1 to suck it. In this embodiment, the position of the suction machine 10A shown in the figure is the separation position (separation part A) for separating the stacked sheets, and the part where the suction machine 10A moves to the rear side and changes direction from the X direction to the Z direction becomes the delivery position (delivery part B) for delivering the separated sheets to the post-processing device.

The suction pad 10a is configured to suck the air in the suction pad through the suction mechanism. Therefore, at the separation position (initial position) of the suction machine 10A, the loading section 3 is driven upward, and the top sheet S1 is in contact with each suction pad 10a and is attracted. Furthermore, when the suction pad is rotated and moves backward, the top sheet S1 is lifted up relative to the stacked sheets and is separated.

In the present embodiment, the first suction machine 10A and the second suction machine 10B are arranged to be movable along the endless track 20. The endless track 20 is provided with: a curved portion 20A, which is curved at 180 degrees at both ends of the carrying direction of the loading portion 3 (both ends of the X direction); and a linear moving portion 20B, which moves linearly between both ends of the loading portion 3; and is formed into a ring in a substantially elliptical shape. On the surface of the endless track 20, there are an annular guide rail 21 and a bend 23, which is wound around pulleys 22 provided at the four corners of the annular guide rail 21, which constitute the conveying mechanism of the first suction machine 10A and the second suction machine 10B.

In this embodiment, in order to stabilize the sheet separation action caused by the suction machine 10A and the second suction machine 10B and the conveying action of each suction machine 10A, 10B, the aforementioned endless track 20 is set on both sides of the loading part 3. Furthermore, the aforementioned first suction machine 10A and the second suction machine 10B are supported by the support shaft 12 that is horizontally supported between the endless tracks 20 set on both sides.

Specifically, both ends of the support shaft 12 are held by the transport boxes 25 fixed to the belt body 23, and the rotating bodies 25a rotatably supported on the transport boxes 25 are engaged with the engaging grooves 21a formed on the surface of the guide rail 21, so that the support shaft 12 is transported and moved along the endless rail 20 (annular guide rail 21).

In addition, the conveying box 25 is equipped with a rotation drive mechanism so that the support shaft 12 is rotationally driven relative to the center shaft. The support shaft 12 is controlled to be rotationally driven relative to the center shaft together with the drive control of the conveying mechanism. That is, the suction machines 10A and 10B control the rotation drive around the support shaft 12, and together with the suction action caused by the suction pad 10a, separate the uppermost sheet by lifting it through the movement control of the support shaft 12.

Specifically, when the first suction machine 10A and the second suction machine 10B are located at the separation section A, the loading section 3 is driven upward to push the top sheet S1 against the suction pad 10a, and the sheet S1 is sucked by the suction action of the suction pad. Then, in this state, the support shaft 12 is driven to rotate while the linear moving section 20B is moved to the rear side, so that the top sheet S1 is lifted up and separated from the stacked sheets.

The air inside the suction pad 10a of the suction machine 10A, 10B is configured to be sucked through the suction mechanism 30. The suction mechanism 30 is provided on the base 2, and in the present embodiment, is supported by the central portion of the endless track 20. The suction mechanism 30 is a cylindrical shell 31 that is rotatably supported. On the surface of the shell 31, a number of suction nozzles 32 corresponding to the suction machine (twelve in the present embodiment) are provided along the circumferential direction.

The nozzles 32 are connected to the nozzles 10d of the suction machines 10A and 10B through pipes (not shown). When the suction machines 10A and 10B move along the endless track 20, the housing 31 is driven to rotate synchronously with the movement. Therefore, the pipes connecting the two nozzles will not get tangled, and the suction action at each suction machine can be performed reliably. In addition, the on/off of the suction action of each suction machine is controlled by the driving signal of the sensor, and the sensor is set at a specified position of the guide rail 21 carrying the suction machines 10A and 10B.

In this embodiment, the first suction machine 10A and the second suction machine 10B are configured to sandwich the above-mentioned loading portion 3 and are located on both sides (upper side and lower side). That is, the first suction machine 10A and the second suction machine 10B are allocated on both sides of the conveying direction and are arranged at positions that are opposite to each other in the vertical direction (diagonal positions of the endless track 20) (Figures 2, 3, and 5).

The transfer section B is on the same plane as the separation section A and is located on the downstream side. When the first suction machine 10A moves to the transfer section B, the second suction machine 10B is driven toward the front end side of the placement section 3 and becomes located below the separation section A. That is, the conveying mechanism is controlled in such a way that when the first suction machine 10A moves from the front end side to the rear end side on the upper side of the placement section 3, the second suction machine 10B moves from the rear end side to the front end side on the lower side of the placement section 3.

The rotation drive of the belt body 23 of the endless track 20, the suction action of each suction machine 10A, 10B, the rotation drive of the support shaft 12 supporting each suction machine, and the drive of the push drive device 5 that moves the loading part 3 up and down are controlled by the control unit. The control unit is, for example, accommodated in a control box 50 installed on the base 2. When the detection signal from the sensor installed in various places is input to the control unit, the drive control of the above-mentioned constituent materials is performed.

As described above, the transfer section B of this embodiment is located on the same plane as the separation section A and on the downstream side, and is configured to be able to transfer the lifted sheet in the separation section A to the post-processing device in its original state. As shown in the schematic diagram of Figure 7, the transfer section B is equipped with a support plate 60, which supports the front end side of the sheet S1 separated into one piece by the separation section A and conveyed in a lifted state. On the support plate 60, a plurality of recesses 61 are formed correspondingly so that each of the plurality of suction pads 10a that move together with the support shaft 12 can be located therein.

When the aforementioned support shaft 12 stops at a predetermined position of the transfer section B, the suction of each suction pad 10a is released, and the sheet S1 becomes free. Furthermore, the sheet S1 on the support plate 60 is further conveyed to the downstream side by the conveying roller 65 and sent to the post-processing device. In addition, the support plate 60 and the conveying roller 65 can also be components of the sheet separation device 1, and can also be components of the post-processing device.

Next, the overall operation of the separation method for separating sheets one by one by using the sheet separation device 1 will be described while combining and referring to Figures 6 to 10.

As described above, the sheet separation device 1 of this embodiment is equipped with a first suction machine 10A and a second suction machine 10B moving along the endless track 20. As shown in Figures 1 and 2, these suction machines 10A and 10B are separately arranged at opposite positions of the endless track 20, and in the initial position, the first suction machine 10A is located at the separation part A.

The following will explain how, when the first suction machine 10A is in the initial position, the top sheet S1 is separated from the stacked sheets S, and then the sheet separation process is continued.

When the first suction machine 10A is separating a sheet at the separation section A, the second suction machine 10B is in a standby state at a lower position behind the mounting section 3 (Figure 1, Figure 2). At this time, the suction pad 10a of the suction machine 10A is downwardly facing the sheet as shown in Figure 6 (a).

In this state, the aforementioned push drive device 5 is used to move the loading section 3 with the stacked sheets upward, pushing the top sheet S1 to the suction pad 10a of the suction machine 10A, and the suction pad performs suction to suck the top sheet S1.

Furthermore, when the top sheet S1 is attracted, the support shaft 12 is rotated approximately 180° as shown in FIG6(b)(c). In this case, even if the second sheet of the stacked sheets is in close contact, it will be separated by the above-mentioned sheet separation mechanism 15.

Next, while the top sheet S1 is being attracted, the loading section 3 is driven downward to separate the top sheet S1 attracted by the suction machine 10A from the stacked sheets S1. In the separation process, while the loading section 3 is being lowered, the above-mentioned support shaft 12 (suction machine 10A) is driven to rotate, so that the top sheet S1 is pulled forward in the X direction and lifted upward. Therefore, the top sheet S1 attracted is gradually separated from the stacked sheets S while moving forward, and is separated by being lifted up relative to the stacked sheets (Figure 8(a)).

Furthermore, in synchronization with the rotation process of the suction machine 10A, the suction machine 10A is moved to the rear side in the X direction to peel off the top sheet S1 lifted along the surface of the stacked sheet S from the stacked sheet S (Figure 8(b); moving process). The movement is performed by the above-mentioned conveying mechanism rotating the driving pulley 22 to drive the belt body 23, and through the conveying box 25 fixed to the belt body 23. In the rotation process and the moving process, the front edge side of the top sheet S1 is reversed and moved backward while rising relative to the stacked sheet S. In addition, since the second sheet and the subsequent sheets are pressed by the sheet separation mechanism 15, they are not brought up.

In such a rotation process and a moving process, it is preferable to drive and control the suction machine 10A and the support shaft 12 so that the moving speed of the suction machine 10A to the rear side is greater than the rotation speed of the suction machine 10A (the rotation speed of the support shaft 12). That is, if the rolling amount of the sheet is greater than the moving amount, the stripping effect caused by the movement cannot be fully obtained, and there is a possibility that multiple sheets will be rolled up. However, by making the moving amount greater than the rotating amount, it is possible to roll up while giving a sufficient stripping effect, thereby improving the separation effect of the sheet.

According to the above separation method, even if the top sheet S1 and the second sheet are in close contact with each other due to static electricity, the resistance during peeling can be made linear, and the accuracy of one-sheet separation will be improved.

In addition, there is no particular limitation on the rotation angle of the suction machine 10A, but in this embodiment, as shown in Figures 6(a) to (c), the suction pad 10a is driven to rotate approximately 180°. In this way, the separated sheets can be fed in a flat shape to the post-processing device disposed on its downstream side, which can suppress the overall enlargement of the device.

The topmost sheet S1 separated as described above is conveyed to the rear side together with the suction machine 10A as it is to the conveying section B (Figure 8(b)). As described above, the conveying is performed by rotating the pulley 22 to drive the belt body 23 wound on the pulley, and through the conveying box 25 and the support shaft 12 fixed to the belt body 23. Since the conveying box 25 is engaged with the engagement groove 21a of the guide rail 21 of the endless track 20, the suction machines 10A, 10B move stably together with the support shaft 12.

In synchronization with the movement of the suction machine 10A to the transfer section B, the other suction machine 10B moves forward from the position shown in Figures 1 and 2 (Figure 8(b)). In this embodiment, when the suction machine 10A is located at the transfer section B, the other suction machine 10B is located below the front end side of the mounting section 3 (in the state of waiting for separation at the separation section A).

Furthermore, when the suction machine 10B moves forward, the support shaft 12 is driven to rotate in a manner such that the suction pad 10a is downward (rotated from the state of FIG. 6(d) to the state of FIG. 6(a)), so as to obtain the same action as the suction action of the suction machine 10A.

The suction machine 10A located in the aforementioned conveying section B conveys the separated sheet to the post-processing device in its original state. At the aforementioned conveying section B, the front end side of the sheet S1 separated by the aforementioned separation section A is supported by the support plate 60, and each of the plurality of suction pads 10a is located in the plurality of recesses 61 of the support plate 60, and the driving and suction actions of the suction machine 10A are stopped. At this time, the sheet S1 becomes free on the support plate 60, and is further conveyed to the downstream side by the rotation drive of the conveying roller 65 as it is, and is thus sent to the post-processing device.

In addition, in synchronization with the action of feeding the sheet S1 into the post-processing device, the suction machine 10A is controlled to move to the initial position shown in Figures 1 and 2. That is, the suction machine 10B is positioned to perform the same separation action in the above-mentioned separation section A.

In this way, the suction machine 10A and the suction machine 10B can continuously separate the sheets and transfer them to the post-processing device.

According to the above structure, sheets can be separated one by one from the stacked sheets. In addition, unlike the previous method of separating sheets by driving a suction machine back and forth, multiple suction machines are set up to continuously separate the sheets by rotating in the same direction, so high-speed processing is possible.

The above describes the implementation of the sheet separation device and the separation method according to the present invention, but the present invention is not limited to the above implementation and various modifications are possible.

The feature of the present invention is that a plurality of suction machines are provided to separate a sheet of sheet material, forming a configuration that can be processed continuously, and there is no special limitation on other components. For example, the movement amount of the suction machines 10A and 10B in the X direction and the rotation radius of the suction pad 10a are set arbitrarily. In this case, by shortening the movement amount in the X direction, it is possible to process at a higher speed, and by reducing the rotation radius of the suction pad 10a, it is possible to reduce the peeling area, improve the reliability of a sheet of separation, and thus enable high-speed separation processing.

Regarding the separation of the sheets in the separation section, even if the suction machines 10A and 10B are not rotated but only moved in the X direction, the peeling effect can be added to the top sheet, but in order to surely perform the peeling, it is better to rotate the suction machine (suction pad). In addition, the process of returning the suction machines 10A and 10B to the initial position is to rotate and drive them at any time after the transfer process at the transfer section B is completed.

Furthermore, instead of driving the aforementioned loading section 3 up and down, each suction machine 10A, 10B may be driven up and down, or both the loading section 3 and each suction machine 10A, 10B may be driven up and down. That is, the suction machines 10A, 10B and the loading section 3 can be driven relative to each other in the stacking direction of the sheet. In addition, the number of suction machines 10A, 10B can be appropriately changed according to the size or material of the sheet to be separated. Furthermore, the structure of the conveying mechanism or the rotation-driven support shaft for conveying the sheet (support shaft) can also be appropriately modified. In addition, the arrangement position of the transfer section B can be appropriately modified according to the system.

Furthermore, the sheet separation device according to the present invention can be used as a device for separating various stacked sheets such as plastic film sheets, paper or metal film sheets, etc.

1: Sheet separation device

2: Base

3: Loading part

10a: Attraction pad

10A, 10B: Suction machine

10d: Nozzle

12: Support shaft

15: Sheet separation mechanism

15A: flange

20: No End Track

20A: bend

20B: Linear motion part

21:Guide rails

21a:Joint groove

22: Pulley

23: Carrying body

25: Transport box

25a: Rotating body

30: Inhalation mechanism

31: Shell

32: Spray nozzle

A: Separation section

B: Delivery Department

S1: Sheet

Claims (12)

A sheet separation device comprises: A loading portion for loading stacked sheets; A first suction machine and a second suction machine for sucking and lifting the top sheet of the stacked sheets stacked on the loading portion, and lifting and separating the sucked top sheet relative to the stacked sheets; A separation portion for separating the stacked sheets; and A transfer portion for conveying the separated sheets to a post-processing device; The first suction machine and the second suction machine are respectively arranged on the side of the separation part and the side of the transfer part, and are repeatedly moved between the separation part and the transfer part through a conveying mechanism, and the conveying mechanism is controlled in such a way that when one of the first suction machine and the second suction machine separates the sheet at the separation part and moves to the transfer part, the suction machine of the other one moves to the separation part. A sheet separation device as described in claim 1, wherein the first suction machine and the second suction machine are arranged along an endless track on both end sides of the aforementioned loading portion, and the endless track has a curved portion that curves 180° respectively and a linear moving portion that moves linearly between the two ends of the aforementioned loading portion. The sheet separation device as described in claim 2, wherein the endless track is provided on both sides of the loading portion; The first suction machine and the second suction machine are supported by support shafts horizontally mounted on the endless track on both sides. A sheet separation device as described in claim 3, wherein the support shaft is rotationally driven around a central axis and moves along the endless track. A sheet separation device as described in claim 4, wherein the first suction machine and the second suction machine are: when located in the separation portion, while sucking the top sheet, the support shaft is rotated and driven while the linear moving portion is moved. A sheet separation device as described in claim 2, wherein the first suction machine and the second suction machine are located on both sides of the mounting portion. The sheet separation device as described in claim 1, wherein the first suction machine and the second suction machine are respectively provided with a plurality of suction pads that are in close contact with the surface of the sheet and suction; The plurality of suction pads are arranged in a straight line at predetermined intervals in a direction orthogonal to the conveying direction of the sheet to be separated. The sheet separation device as described in claim 7, wherein the transfer portion is provided with a support plate, which supports the front end side of the sheet separated into one piece by the separation portion; On the support plate, a plurality of recesses corresponding to the plurality of suction pads are formed, and when the suction pad is located in the recess, the suction of the suction pad is released, and the front end side of the sheet separated into one piece is supported on the support plate. The sheet separation device as described in claim 7, wherein there is a pushing drive device that pushes the above-mentioned loading part to the suction pads of the above-mentioned first suction machine and second suction machine. A sheet separation device as described in claim 5, wherein the suction machine and the support shaft are driven and controlled so that the moving speed of the suction machine is greater than the rotation speed of the suction machine. A sheet separation method comprises: A separation process, in which the top sheet is sucked and lifted relative to the stacked sheets in the separation section, and the sucked top sheet is lifted and separated relative to the stacked sheets; A conveying process, in which the lifted and separated sheet is conveyed; and A transfer process, in which the sheet conveyed in the conveying process is transferred to the transfer section of the post-processing device; wherein the separation process is to continuously perform sheet separation through a first suction machine and a second suction machine arranged along an endless track; wherein the transfer process is to convey the suction machine of the other suction machine to the separation section when one of the first suction machine and the second suction machine is conveyed to the transfer section. A sheet separation method as described in claim 11, wherein the separation process is to transport the top sheet being attracted by the suction by lifting it up relative to the stacked sheets and transferring it to the post-processing device.

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