JP2005306611A - Conveyor table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop an exclusive belt table capable of securely carrying sheets in any operating state, particularly, even when vary large-sized sheets are used, easily adjustable after installation, and capable of solving the risk of the scratch of the sheets. <P>SOLUTION: This suction belt table 1 comprises a suction belt 2 endlessly turning therearound. A ventilation opening part 6 is formed in the side of the suction belt 2 to securely carry the sheets B through the suction belt table 1. A blow air is supplied to the ventilation opening part 6 independently or for each group to prevent sheet carrying from being improperly affected by excessively large or small amount of blow air. Thus, the sheets B can be carried, without binding and abrasion, on the suction belt table 1 without performing troublesome operations. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The invention relates to a device according to the superordinate concept of claim 1.

  In order to supply a sheet to a sheet processing apparatus such as a sheet-fed paper printer, the sheet is first discharged from the upper side of the sheet stack into a sheet feeder as a sheet stream arranged one by one. Further, it is usually necessary to transport a certain section to the feed portion of the sheet processing apparatus after taking out one sheet. Usually, in order to convey at high speed, a sheet is conveyed to a sheet processing apparatus as a sheet stream. However, it is also possible to supply sheets one by one. Therefore, when conveying a sheet from the sheet feeder to the sheet processing apparatus, a so-called belt table is used. This is in order to reliably guide the sheet stream or one sheet stacked below. Here, a so-called suction belt table is particularly desirable. The suction belt table is below the upper surface for transporting the sheet and includes at least one box-like cavity, on which the transport belt is guided in the form of a suction belt. The suction belt is usually a flat belt with a plurality of openings. In order to convey the sheet through the suction belt table, the suction belt is driven by a shaft (a so-called first belt roller) disposed at least at one end of the suction belt table, and the first belt located at the other end of the suction belt table. The direction is changed via two shafts or belt rollers, and is kept straight by a fixture. When the sheet is conveyed by the suction belt, a suction air feeder is disposed below the suction belt table in order to fix the sheet to the suction belt, and the suction air is fed into the cavity in the suction belt table. The suction air feeder can be configured as a simple fan or blower connector.

  A so-called feed table is connected to the belt table end, and a front lay or cover lay for aligning the front edge of the sheet in the conveying direction and a so-called side lay for aligning the lateral direction of the sheet are arranged here. Yes.

  Further, in the case of a large sheet processing apparatus, there is also known a method in which the conveyance of a sheet stream via a belt table is supported by an auxiliary side conveyance belt outside the operation range of the suction belt. This auxiliary transport belt (also called a support belt) has a simple flat belt shape and is not sucked by suction air. The auxiliary transport belt or support belt usually circulates around the belt table so that the upper surface of the belt does not touch the table surface, so that the portion of the belt table outside the suction belt that is not affected by suction air is not affected. The sheet can be easily conveyed.

  Such known suction belt tables have various disadvantages. Since the auxiliary conveying belt disposed on the side is positioned at the edge portion of the sheet to be conveyed according to the size of the sheet, there is a possibility that a failure may occur even in normal sheet conveyance. Therefore, it may be necessary to perform complicated side adjustment to remove the conveyance belt from the sheet edge portion. This is particularly important when the sheet edge used for adjusting the side of the sheet enters the range of the conveying belt. At this time, the sheet edge in the side adjustment direction sticks to one of the conveying belts, and if it is fed as it is, there is a high risk of the sheet being twisted. In this case, it is impossible to properly adjust the sheet before supplying it to the sheet processing apparatus. In addition, the auxiliary belt tends to scratch the lower part of the delicate sheet.

  From Patent Document 1, a method and an apparatus are known in which sheet-like printing paper is fed into a printing machine in a stream form that is stacked below. Here, a conveyor table with blower openings between and next to the suction belt is described. As a result, an air flow is created in the direction opposite to the feeding direction of the conveyor table, and sheets transported on the conveyor table as sheet streams stacked below adhere to the surface of the conveyor table or generate static electricity. The risk of doing so is reduced.

The disadvantage of this device is that the arrangement of the blower openings in the part of the conveyor table facing the printing press is only dotted or linear. A major disadvantage is that air is blown to the front edge of each sheet because the direction of the blower is opposite to the conveying direction of the conveyor table. This air flow is particularly strong at the outlet. In this case, since the blower is blown between the front edges of the sheet, the sheet tends to flutter.
German Patent No. 4413089C2 Specification

  Accordingly, an object of the present invention is to improve the belt table so that sheet conveyance can be reliably performed by a simple method without causing conveyance resistance even in the case of large format paper and without causing damage to the sheet during the conveyance process. It is.

  The object of the present invention is to ensure that the sheet can be conveyed even in any operating state, particularly when using very large sheets, and can be easily adjusted later, and at the same time, the danger of sheet scratching can be solved, It is to develop a professional belt table.

  The features of the solution to this problem are described in claim 1.

  The conveyor table is provided with a pneumatic device for forming a thin flat air cushion at least on the side conveying section. For this purpose, the conveying unit is provided with a blower supply device and a blower opening arranged in a plane.

  The solution to this problem is particularly advantageous in that the seat guide can be carried out without the use of side support belts, that it is a very simple method and that post-adjustment is possible. Furthermore, the sheet is guided through the side portions of the table in a very good way without the risk of scratching the delicate sheet surface. This is particularly advantageous in the case of foil materials and the like.

  The apparatus for supplying the blower in a planar shape can also be installed between the conveying belts, and here also has the advantageous effect of being able to guide without risk of scratching.

  It is also an advantageous method to provide a so-called blowout / suction nozzle in the blow opening. Even if the flow rate is lowered, the nozzle can be supplied with an increased pressure of the blower.

  Excess air generated from the air cushion is exhausted from every guide portion through a special opening opened in the table surface at the tip of the conveyor table facing the sheet processing apparatus. At the same time, air can be discharged through a ventilator in the surface of the conveyor table in parallel with the suction belt installed as required. The air can be actively discharged by suction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a conveyor table or a suction belt table 1. The conveyor table or suction belt table 1 has a box-shaped cavity 7 (see FIG. 2), not shown in this figure. On top of this cavity 7 one or more conveyor belts are guided in the form of a suction belt 2 with an opening. Although not shown in this drawing, the suction belt 2 is held and driven by two belt rollers 4.1 and 4.2 arranged in the transport direction. Furthermore, a tension roller 4.3 can be installed in the web of the suction belt 2. The cavity 7 in the conveyor table or the suction belt table 1 is directly connected to the fan 3 or connected to the blower via a vacuum hose, through which air is discharged. In this way, the air is discharged from the suction belt 2 or its opening, and the sheets B on the conveyor table or the suction belt table 1 are each fixed in place and conveyed forward in accordance with the operation cycle of the suction belt 2. It is.

  A ventilation device can be provided in the conveyor table or suction belt table 1 in parallel to the suction belt 2. This mainly serves to prevent the air suction action generated from the suction belt 2 from reaching the conveyor table or the guide portion of the suction belt table 1 next to the suction belt 2.

  Next to the suction belt 2, one guide portion 5 is provided on the outer portion of the conveyor table or the suction belt table 1. The guide portion 5 is made of a low friction material and has a structured surface as required. The guide portion 5 can better guide a portion of the sheet B on the conveyor table or the suction belt table 1 outside the suction belt 2 (the portion dragged on the conveyor table or the suction belt table 1). This is particularly important for very large sheets.

  Further, there is a place where the sheet B is dragged in the guide portion between the suction belts 2.

  In front of the conveyor table or the suction belt table 1, a sheet feeder (not shown) is usually arranged in the conveying direction T of the sheet B. Here, the sheets B are separated one by one from the upper surface of the sheet stack. The Thereafter, the sheet B is supplied to the conveyor table or the suction belt table 1 via the baffle plate 11. A sheet processing apparatus such as a printing machine can be connected to the conveyor table or the suction belt table 1 by using a feed table 12 as shown in FIG. A side lay 13 is shown as part of the feed table 12. Since one side edge of the sheet B hits the stopper by the side lay 13, the side position can be determined before the sheet B is supplied to the sheet processing apparatus. Another side lay 13 may be disposed on the opposite side of the feed table 12.

  In FIG. 1, the sheet B to be processed is shown in a position before the lateral alignment in the sidelay 13. Edge B used for alignment It can be seen that 1 is approximately in the center of the guide portion 5. However, when the sheet is conveyed on the conveyor table or the suction belt table 1 and when the side alignment operation is performed in the direction of the arrow of the side lay 13, the sheet B is relatively on the conveyor table or the suction belt table. It is necessary to move on a wide surface.

  In the conveyor table or suction belt table 1, ventilation openings 6, which are distributed mainly over the entire surface of the guide part 5, are provided in the conveyor table or suction belt table 1, in order to avoid obstacles leading to the twisting of the sheet B. . These ventilation openings 6 can be configured as circular openings or nozzle-shaped openings. In the case of nozzle-shaped embodiments, these working directions can be adjusted in the same plane direction as the surface of the conveyor table or suction belt table 1 or in a direction relative to this surface. The blow direction is usually directed in the transport direction T, but can be directed in a direction crossing the blow direction. The nozzle can also be configured as a so-called blowout / suction nozzle.

  Ventilation openings 6 or nozzles can also be arranged on the surface of the central guide part 5.1 between the suction belts 2.

  FIG. 2 shows a longitudinal sectional view of the structure of the conveyor table or suction belt table 1. Here, the ventilation opening 6 is depicted only in the cross-sectional view of FIG.

  The supply of the blower to the ventilation opening 6 is preferably performed for each group as shown in FIG. 3, but can also be performed individually. For this purpose, it is necessary to arrange the blower supply device 8 and / or the air chamber 9 individually or in combination in a part of the lower guide part 5 of the conveyor table or suction belt table 1. As for the air chamber 9, the blower supply device 8 can be arranged individually or in combination. The air chamber 9 can also be configured as part of the table surface of the conveyor table or the suction belt table 1. In FIG. 3, an air chamber 9 for supplying air to the suction belt 2 is arranged beside the cavity 7. When integrated, the cavity 7 can extend over the entire table surface and the air chamber 9 can be separated from the cavity 7.

  An air supply device 8 that is a common system is disposed in the air chamber 9. The position of the fan 3 that supplies suction air to the suction belt 2 through the cavity 7 is indicated by a dotted line.

  As shown in FIG. 2, the ventilation openings 6 can advantageously be distributed in rows arranged parallel to the suction belt 2 in each guide part 5. The software supply device 8 can be arranged in any form for each column. The air supply from the blower supply device 8 to the ventilation opening 6 can be turned on / off according to the overlap state of the sheet size and the guide portion 5. For this purpose, it is necessary to control the blower supply device 8 via, for example, an electronically switchable valve 15 (see FIG. 4). This control can be performed by the machine control device so that the sheet size can be input and changed.

  The group of ventilation openings 6 can also be supplied with blower via the air chamber 9 (10) using a fan arranged in the air chamber 9 (10).

  In the central guide portion 5.1 between the suction belts 2, the air supply devices can be arranged and grouped in the same way as described above.

  FIG. 3 shows a cross section of the conveyor table or suction belt table of FIG. Shown is the table surface of a portion of the guide portion 5. The guide portion 5 is provided with a ventilation opening 6. An air chamber 9 is connected to the conveyor table or suction belt table 1 at the ventilation opening 6. This is arranged below the conveyor table or suction belt table 1 in parallel with the cavity 7. A blower supply device 8 is connected to the air chamber 9. The blower supply device 8 has a switchable valve 15 for turning on / off the blower supply.

  What is important is that the blown air blown forms only a relatively thin layer of carrier air, such as a membrane. It is also important that no blower is placed between the sheets B. Therefore, it is necessary to spray a relatively large amount of blower at the same time even at a low pressure.

  The sheet B can be conveyed in the conveyance direction T using the direction of the blown air blown out from the ventilation opening 6. Further, the blow direction of the ventilation opening 6 is set at an angle of 0 to 90 degrees with respect to the direction of the side edges facing each other of the conveyor table or the suction belt table 1 or the direction of the outer edge of the conveyor table or the suction belt table 1. The slack of the sheet B can be taken. For this purpose, the direction of action of the nozzles can be adjusted individually or in groups.

  In order to change the acting direction of the conveying air, the nozzle blowing angle with respect to the plane of the conveyor table or the suction belt table 1 can be adjusted. For example, when the material is heavy or the surface is relatively rough, the nozzle blowing angle can be increased.

  FIG. 4 shows a bottom view of the conveyor table or suction belt table 1. Here, the fan 3 for sending air to the cavity is arranged in the center. Furthermore, belt rollers 4.1 and 4.2 for guiding the suction belt 2 (not shown) are also shown. Air chamber groups 9 and 10 are arranged on the sides of the fan 3, respectively.

  In the upper part of the figure, the air chambers 9 are arranged in two rows parallel to the transport direction T. A part of each guide portion 5 is coupled to these air chambers 9 for supplying air. The sizes of the air chambers 9 can be changed along the direction of the transport direction T, for example.

  The air chamber 9 is provided with one blower supply device 8 as a whole. The blower supply device 8 has a valve 15 (flap) which can be remotely operated as an auxiliary, and can limit the air supply amount and supply place or turn it on / off.

  In the lower part of the figure, the air chambers 10 are arranged in a row parallel to the transport direction T. These air chambers 10 are each coupled with a part of the guide portion 5 for supplying air, but the size of the portions is larger than that of the air chamber 9. The sizes of the air chambers 10 can be changed along the direction of the transport direction T, for example. The air chamber 10 is also provided with one blower supply device 8 as a whole. The blower supply device 8 has a valve 15 (flap) which can be remotely operated as an auxiliary, and can limit the air supply amount and supply place or turn it on / off.

  The valve 15 can be used to control the air supply from the air chambers 9 and 10 to the next air chamber. For example, the air pressure of the air supplied to the leading air chambers 9 and 10 can be increased. Various actuation methods are possible by changing the arrangement of the valve 15 and its controllability.

  As a whole, for example, it is possible to evenly supply the blower to all the parts of the guide part 5 which are provided above the air chambers 9 and 10 and have ventilation openings 6 connected to each other. Of course, nonuniformity is also possible. It is also possible to reduce the pressure of the air supplied to the outer edge of the guide portion 5 in order to prevent blowing up at the outer edge. Similarly, the pressure of the air supplied to the edge of the conveyor table or the suction belt table 1 in the transport direction T can be reduced. Similarly, the pressure distribution on the surface of the conveyor table 1 can be asymmetric. The same applies to the adjustment of the amount of air sent to convey the sheet B.

  When blowing down using the conveying air, the sheet B may not be reliably set at the position of the position mark due to the air layer. Therefore, the top of the feed table 12 of the sheet processing apparatus such as a printing machine at that time A problem may occur in the alignment of the sheet B. Therefore, one or a plurality of air discharge openings 14 are provided at the exit end of the conveyor table or suction belt table 1 near the transition to the feed table 12 connected to the guide portion 5 or 5.1. be able to. This air discharge opening 14 is connected to the surroundings under the conveyor table or suction belt table 1 and is preferably free of pressure. Excess transport air can be discharged from the lower portion of the leading sheet B for alignment adjustment by the air discharge opening 14. This ensures that the sheet B is set on all necessary alignment elements on the feed table 12.

  Moreover, in the guide part 5 or 5.1, when the ventilation apparatus for processing the suction air which causes creeping is arrange | positioned at the suction belt 2, it is along the suction belt 2 by the above simple methods. Air is discharged.

  Further, when the air discharge opening 14 is arranged, an exhaust device for actively discharging the air cushion still remaining in the lower part of the seat B can be provided. The active exhaust can be controlled and can be turned on / off in accordance with the timing of sheet conveyance.

  Further, the air supply to the conveyor table or the suction belt table 1 is such that when the last sheet B to be processed is conveyed, the blower of the guide portion 5 or 5.1 is successively moved from the entrance end to the exit end. Can be controlled to turn off. As a result, it is possible to prevent the sheets B that are no longer overlaid without gaps from being lifted from the conveyor table or the suction belt table 1 and conveyed inaccurately. For this purpose, various controllable valves 15 are arranged in the blower supply device 8 in FIG.

  During operation, during the process of lifting the first sheet B or when the last sheet B is discharged from the conveyor table or suction belt table 1, the valve 15 depends on the part currently covered by the sheet, respectively. Opens and closes. Thereby, the conveyance air can be blown onto the surface portion of the guide portion 5 covered with the sheet B. On the other hand, in the uncovered portion or the uncovered portion at that time, the supply of the blower is interrupted, so that the sheets B arranged individually without overlapping do not flutter.

  In order to take up the slack of the sheet, the nozzle oriented laterally at the exit portion of the conveyor table or the suction belt table 1 has the free end of the sheet B, that is, the leading edge of the first sheet B or the trailing edge of the last sheet B. It is desirable to strengthen the blow wear in the sheet B and enhance the sagging removal effect on the sheet B. For this purpose, the last nozzle can be configured as a so-called blowout / suction nozzle. In the case of the blowout / suction nozzle, the outer shape becomes special due to the blown air in addition to the air cushion, so that a suction action that acts only on the blowout / suction nozzle portion is also obtained.

  It is desirable that the nozzles in the other surface parts or all the nozzles of the guide part 5 or 5.1 can be configured as blowout / suction nozzles. The blowout / suction nozzle can achieve high air pressure even when the flow rate is low. Therefore, the air supply for the blowout / suction nozzle is performed separately from the other ventilation openings 6. As mentioned above, this can be done in a simple way by group placement.

  Due to the described features, even very sensitive sheet materials can be transported smoothly via large conveyor tables or suction belt tables. The present invention can be further developed with specialized techniques.

It is a general view of a suction belt table. It is a longitudinal cross-sectional view of a suction belt table. It is a cross section of a suction belt table. It is a bottom view of a suction belt table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suction belt table 2 Suction belt 3 Fan 4.1 Belt roller 4.2 Belt roller 4.3 Tension roller 5 Guide part 5.1 Center guide part 6 Ventilation opening part 7 Cavity 8 Blowware supply device 9 Air chamber 10 Air chamber 11 Baffle plate 12 Feed table 13 Side lay 14 Air discharge opening 15 Valve B Seat B. 1 Sheet edge T Transport direction

Claims (24)

One or more conveyor belts that can be driven and circulate indefinitely around the conveyor table (1), for example, a suction belt (2) that can be suctioned by suction air, and are arranged parallel to the sides of the conveyor belt An air blowing device that blows air under the sheet stream outside the conveying range of the conveying belt in the guide portion (5) of the conveyor table (1), and the sheet form material is supplied from the sheet feeder, In a sheet processing apparatus, in particular a conveyor table (1) for conveying to a sheet-fed rotary press as a stream of sheets stacked below, preferably a suction belt table apparatus,
At least the guide part (5) outside the transport belt (2) is provided with a plurality of ventilation openings (6) arranged mainly on the entire surface of the guide part (5), and the ventilation openings (6 ) To a guide part (5) mainly comprising a blower supply device (8) which is at least partly continuous so that the blower can be sprayed on the partial surface or the entire surface. The apparatus of claim 1.
Ventilation opening (6) is provided in the guide part (5) and / or in the central guide part (5.1) arranged between the conveyor belts (2) . The apparatus according to claim 1 or 2,
Ventilation opening (6) is configured as a nozzle. The apparatus of claim 1.
Ventilation opening (6) is configured as a blowing / suction nozzle. In the apparatus in any one of Claims 1-4,
Ventilation opening (6) partly configured as a blow-off / suction nozzle. In the apparatus in any one of Claims 3-5,
A device characterized in that the ventilation opening (6) is configured as a nozzle directed from the center of the conveyor table (1) to the side edge at the outlet end of the conveyor table (1). In the apparatus in any one of Claims 3-5,
The ventilation opening (6) is configured as a nozzle directed in the transport direction (T) direction of the conveyor table (1) on the front surface of the conveyor table (1) before the inlet side end and the outlet side end. A device characterized by. In the apparatus in any one of Claims 1-7,
The air blowing direction of the ventilation opening (6) is adjusted to be flush with the plane of the conveyor table (1) and / or relative to the plane of the conveyor table (1) individually or group by group A device characterized in that it is configured as a nozzle that can be used. The device according to any one of claims 1 to 8,
A device characterized in that the blower can be supplied simultaneously to the ventilation openings (6) of each guide part (5). The device according to any one of claims 1 to 8,
A device characterized in that the blower can be supplied in groups to the ventilation openings (6) of each guide part (5). In the apparatus in any one of Claims 1-10,
Ventilation openings (6) are arranged in a row parallel to the conveyor belt and are capable of simultaneously supplying the blower to each row. The device according to any one of claims 1 to 11,
Air chambers (9, 10) are assigned to the air supply side of the individual ventilation openings (6) or the ventilation openings (6) grouped together, and at this time, each ventilation opening (6). Is in communication with one air chamber (9, 10), and the air can be supplied to each air chamber (9, 10) individually or as a group of air chambers (9, 10) simultaneously. Device to do. The apparatus of claim 12, wherein
A device characterized in that the air chamber (9, 10) is part of the conveyor table surface of the conveyor table (1). The device according to claim 1,
One or a plurality of air discharge openings (14) at the exit end portion of the guide portion (5) or (5.1) of the conveyor table surface of the conveyor table (1) arranged in the direction of the transport direction (T) ) Through which excess air can be discharged from the portion of the sheet (B) to be conveyed below the conveyor table surface. The apparatus of claim 14.
An apparatus comprising an air discharge device in the air discharge opening (14). The device according to claim 14 or 15,
An apparatus in which the air discharge device of the air discharge opening (14) sucks air and can operate in accordance with the transport timing. The device according to any one of claims 1 to 16,
A control device is provided. After detecting the format of the sheet (B) to be processed by the control device, the air supply is performed for positioning in the guide portion (5) with respect to the position of the edge of the sheet (B). When the adjustment device acting on the device is controlled and it is detected that the edge (B.1) of the seat (B) approaches the boundary of the assigned guide portion (5), the ventilation opening (6 ) Or the air supply to the group of ventilation openings (6) is switched on / off. The apparatus according to claim 1,
When the first or last sheet (B) to be processed is conveyed on the conveyor table (1) by the control device, the ventilation opening (6) or the ventilation opening ( The air supply to the group of 6) can be turned off one after another for each assigned guide part (5), mainly depending on the exposed surface of the conveyor table, or on the sheet of the conveyor table (1) A device characterized in that the air supply adjustment device can be controlled so that it remains on in the covered part. 20. The device according to claim 18 or 19,
In the brower supply device (8) there is a valve (15) assigned to the group of ventilation openings (6) or individual air chambers (9, 10) or groups of air chambers (9, 10). The valve (15) is switched by a control device that turns on / off the air supply to the guide part (5) or a part of the guide part (5) according to the operating state of the conveyor table (1). A device characterized by. The apparatus according to any one of claims 1 to 19,
Blowware supply is characterized in that at least the supply pressure and / or the air supply amount can be changed according to the type of printing paper due to basis weight and / or surface properties and / or air permeability and / or scratch resistance . The device according to any of claims 1 to 20,
A device characterized in that the blower supply can change at least the supply pressure and / or the air supply amount for each location with respect to the location of the conveying surface in the guide part (5). One or more conveyor belts with a suction belt (2) that can be driven and that circulates indefinitely around the conveyor table (1) and can be sucked with suction air are used. The conveyor table (1), preferably a suction belt, by blowing air under the sheet stream outside the guide range of the conveyor belt of the guide portion (5) of the conveyor table (1) arranged parallel to the sides of the conveyor table (1) In the method of performing sheet feeding from the sheet feeder to the sheet processing apparatus as a sheet stream in the form of being stacked on the table below
A uniform air cushion is formed under the sheet stream by a plurality of individual ventilation openings (6) distributed mainly over the entire surface of the guide portion (5) at least on the guide portion (5) outside the conveying belt (2). At this time, the guide portion (5) is blown mainly on different surface by the ventilation opening (6) connected at least partially via the blower supply device (8). how to. 23. The method of claim 22, wherein
A plurality of individual ventilation openings (6) distributed mainly on the entire surface of the guide part (5) in the guide part (5) outside the transport belt and / or the central guide part (5.1) between the transport belts. ) To form a uniform air cushion under the seat stream, at which time the guide part (5) or (5.5) is provided by the ventilation opening (6) connected at least partly via the blower supply device (8). 1) The method characterized in that different blowers are sprayed mainly for each partial surface. The method of claim 17, wherein
In the partial range in the guide part (5) or (5.1), the blower feeder (8) transports the first sheet (B) entering the conveyor table (1) in the transport direction (T). When starting, the blower supply is continuously turned on one after another until covered by the first sheet (B) until the entire guide part (5) is covered, and / or parts in the guide part (5) In the range, when the last sheet (B) is discharged from the conveyor table (1) in the direction of the conveyance direction (T) by the blower supply device (8) and the sheet conveyance is completed, the blower supply device (8) covers the last sheet (B). A method characterized by turning off the blower supply one after another until the guide part (5) or (5.1) is turned off as it disappears.

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