JP2008024456A - Sheet stacking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet stacking device capable of securely separating sheets by a prescribed number to be stacked, and especially, securely separating the sheets by the prescribed number even if stacking the sheets at high processing speed. <P>SOLUTION: Sheets R are stacked on a receiving plate 24, and when the number of the sheets R reaching the prescribed number is detected by a counter 32, a temporary holding plate 27 is lowered below the lower surface of a lower surface carrying vacuum conveyor 23. The sheet R in a prescribed place is forcedly pushed up by the temporary holding plate 27 to form a gap between the proceeding sheet and a succeeding sheet R (the first sheet of the next stack), and the temporary holding plate 27 is inserted into the gap. Therefore, the sheet R in the prescribed place is stacked on the receiving plate 24, while the succeeding sheet R is prevented from being stacked on the receiving plate 24, but received by the temporary holding plate 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet stacking apparatus. More specifically, the present invention relates to a sheet stacking apparatus for counting, stacking and taking out a predetermined number of sheets continuously fed by a conveyor.

  In the process of aligning and stacking a predetermined number of cut sheets of a predetermined size, the sheets are fed one by one through the conveyance path, and the sheet stacking apparatus aligns the predetermined number of sheets while counting the number of sheets.

  FIG. 1 is a schematic side view showing the structure of a conventional stacking apparatus 11 (cardboard counting apparatus; Patent Document 1) for stacking sheets. In this stacking device 11, the first conveyor 12 and the second conveyor 13 are arranged in a different stage, and a counter 14 for counting the number of sheets P passing therethrough is provided at the front end of the first conveyor 12. It has been. Below the front end portion of the first conveyor 12, a cradle 15 is provided that protrudes upward toward the rear end portion of the second conveyor 13. Further, a cylinder 16 for aligning the sheet P by bringing the projected rod into contact with the edge of the sheet P is provided above the rear end of the second conveyor 13.

  Thus, in the stacking device 11, the sheets P are stacked and stored at the rear end portion of the first conveyor 12, and the sheets P are sent out one by one and conveyed forward by the first conveyor 12. The number of sheets P passing through the counter 14 is counted. At this time, the cradle 15 is retracted below the first conveyor 12, and the rod of the cylinder 16 protrudes downward, so the sheet P that has passed through the front end of the first conveyor 12 It falls on the rear end portion of the conveyor 13 and is sequentially accumulated here. The rods of the cylinder 16 protruding downward align the edges of the sheets P stacked on the second conveyor 13 and also prevent the sheet P stack from being conveyed by the second conveyor 13. Is stopped.

  When a predetermined number of sheets P are stacked on the second conveyor 13 in this way, the rod of the cylinder 16 is retracted upward, and as shown in FIG. 1, the stacked body of sheets P on the second conveyor 13 is the conveyor. 13 is carried forward. At the same time, the cradle 15 protrudes to the rear end portion of the second conveyor 13 and receives the sheet P falling from the first conveyor 12. When the aggregate of sheets P on the second conveyor 13 has been unloaded from the conveyor 13, the cradle 15 is retracted and the sheets P accumulated on the cradle 15 are dropped onto the second conveyor 13. . At the same time, the rod of the cylinder 16 protrudes downward to stop the accumulation of sheets P on the second conveyor 13. Then, the sheets P falling from the first conveyor 12 are accumulated on the sheets P on the second conveyor 13.

  In the stacking device 11, by repeating the above-described operation, a stack of a predetermined number of sheets P is carried out from the second conveyor 13 at a constant cycle.

  However, in such a stacking apparatus 11, it is difficult to shorten the processing time of the stacking apparatus 11 for the following reasons, and there is a problem in processing a large number of sheets P. In order to process a large number of sheets P in a short time, it is necessary to increase the number of sheets P conveyed per unit time by increasing the conveyance speed of the sheets P and shortening the interval between the conveyed sheets P. I must. However, when the conveying speed of the sheet P by the first conveyor 12 is increased or the interval between the conveyed sheets P is shortened, the stacking apparatus 11 as described above has the sheet P (sheet) when the predetermined number of sheets is reached. It becomes difficult to separate the last sheet of the stack) from the sheet P fed from behind (the first sheet of another sheet stack), and the subsequent sheet P is placed on the previous stack. There is a risk of accumulation. When the succeeding sheet P is stacked on the previous stack, the number of sheets P in the previous stack becomes greater than the predetermined number, and the number of sheets P in the subsequent stack becomes smaller than the predetermined number. Then, a count failure of the number of sheets P occurs.

  Further, when the stack on the second conveyor 13 is carried out and the receiving table 15 is projected onto the second conveyor 13, the timing when the receiving table 15 protrudes and the sheet P fall from the first conveyor 12. If the timing does not match, the sheet P may drop from the stacking device 11 and the number of stacks may be insufficient.

  Therefore, in the conventional stacking apparatus 11, it is difficult to shorten the processing time when dividing a large number of sheets by a predetermined number. When the processing speed is increased, the number of stacked bodies becomes uneven and defective products are generated. There was a fear.

Further, the stacking device 11 is suitable for stacking thick paper such as paperboard, and it is difficult to align and stack even thin paper such as copy paper. That is, in this stacking device 11, since the drop between the first conveyor 12 and the second conveyor 13 or the cradle 15 is large, the sheet P is transferred from the first conveyor 12 to the second conveyor 13 or the cradle 15. The fall distance when transporting is increased. Therefore, when the sheet is thin paper, when the sheet falls from the first conveyor 12, the sheet floats due to air resistance and the dropping position is not determined, and the degree of dispersion of the accumulated sheets increases. In the case of conspicuous, the sheet may fly to another position and not be accumulated. Therefore, in the case of thin paper, it cannot be mechanically aligned by a jogging plate or the like, and sheets accumulated by hand must be aligned.
Japanese Utility Model Publication No. 06-56855

  The present invention has been made in view of the technical problems as described above, and an object of the present invention is to reliably separate and stack a predetermined number of sheets, particularly at a high processing speed. An object of the present invention is to provide a sheet stacking apparatus capable of reliably separating and stacking a predetermined number of sheets even when stacking. Another object of the present invention is to provide a sheet stacking apparatus capable of stacking a predetermined number of sheets with a small degree of dispersion even in the case of thin sheets.

  The sheet stacking apparatus of the present invention includes a transport conveyor that sequentially transports sheets, a counter that detects and counts the sheets sent by the transport conveyor, and a cradle that receives and stacks the sheets transported by the transport conveyor, A sheet stacking apparatus for stacking a predetermined number of sheets on a cradle and taking out a stack of sheets stacked on the cradle, the predetermined number of sheets constituting the stack or the next stacking Separation means for separating the predetermined number of sheets and the subsequent first sheet when the counter detects a first sheet constituting the body, and the predetermined sheet separated by the separation means Inserted between the first sheet and the first sheet, temporarily holds the first sheet and subsequent sheets temporarily, and the sheet stack is unloaded. Is characterized by having a temporary holding plate for transferring the sheets are temporarily held in the cradle is empty.

  In the sheet stacking apparatus of the present invention, since the sheets are temporarily held by the temporary holding plate, it is necessary to stop the conveyor when discharging a stack of sheets that have been stacked in a predetermined number. Therefore, the processing efficiency of the sheet stacking apparatus can be increased. In addition, the separating means forcibly separates the predetermined number of sheets (last sheet) from the stack and the first sheet of the next stack, and securely inserts the temporary holding plate between the two sheets. Since the first sheet is fed onto the previous stack, a problem that the number of sheets of the previous stack is different from the predetermined number is less likely to occur. In particular, even when the conveying speed of the conveyor is increased or the sheets are continuously fed, the number of sheets of the stacked body can be accurately determined, so that the processing speed and accuracy of the sheet stacking apparatus can be improved. .

  In the sheet stacking apparatus of the present invention, it is preferable that the transport conveyor transports the sheets in a state where the sheets partially overlap each other. If the sheets are conveyed while being overlapped with each other, the number of sheets conveyed per unit time is increased, so that the processing speed of the sheet stacking apparatus is improved and a large number of sheets can be processed in a short time.

  In addition, according to the sheet stacking apparatus of the present invention, since the predetermined number of sheets and the first sheet can be reliably separated, the sheets are fed in an overlapping state, or the conveyance speed of the conveyance conveyor is increased. However, the inconvenience that the number of sheets of the separated stacked body is different from the predetermined number is less likely to occur, and it becomes possible to divide the predetermined number of sheets at high speed with high accuracy.

  Furthermore, in the sheet stacking apparatus of the present invention, it is desirable that the transport conveyor is a vacuum conveyor that sucks and transports the sheet to the lower surface. In the case of a transport conveyor that transports a sheet placed on the top surface, it will be received by a receiving stand that jumps out of the end of the transport conveyor and falls, and the distance of the sheet increases, so the accumulated sheets The degree of looseness increases. On the other hand, in the case of the conveyance conveyor of the present invention that adsorbs and conveys the sheet to the lower surface, the sheet dropping distance can be shortened, the sheet can be released at any position and dropped onto the cradle, Sheets can be accumulated on the cradle reliably and with a small degree of dispersion.

  Further, according to an embodiment of the present invention, in the sheet stacking apparatus using a transport conveyor that sucks and transports the sheet to the lower surface, the temporary holding plate also serves as the separating unit, and the lower surface of the temporary holding plate is the stack. The predetermined number of sheets constituting the sheet are pushed down from the lower surface of the conveyor to separate the predetermined number of sheets from the succeeding first sheet and to stack the predetermined number of sheets on a receiving table. In addition, the first sheet is placed on a temporary holding plate. In this embodiment, since the temporary holding plate also serves as the separating means, the number of parts is reduced and the configuration of the sheet stacking apparatus is simplified.

  In another embodiment of the present invention, in the sheet stacking apparatus using a transport conveyor that sucks and transports a sheet to a lower surface, the separating unit is constituted by a vacuum unit that sucks the lower surface of the sheet, and the vacuum The portion adsorbs the lower surface of the first sheet constituting the stack to separate the first sheet and the predetermined number of sheets immediately before it, and And the first sheet is placed on the temporary holding plate inserted between the predetermined number of sheets and the first sheet. In such an implementation pair, since the sheet is adsorbed by the vacuum portion, the sheet is less likely to drop off when the stack is switched.

  According to still another embodiment of the present invention, in the sheet stacking apparatus using a conveyer that sucks and conveys the sheet on the lower surface, the separating unit is configured by an air blowing unit that blows air on the upper surface of the sheet. The predetermined number of sheets constituting the stack are pushed down from the lower surface of the conveyer by blowing air from the air blowing unit to separate the predetermined number of sheets from the subsequent first sheet, The first sheet is stacked on a receiving table, and the first sheet is placed on the temporary holding plate inserted between the predetermined number of sheets and the first sheet. It is characterized by letting. According to such an embodiment, since it is not necessary to move the air blowing section, the configuration of the sheet stacking apparatus can be simplified.

  Hereinafter, embodiments of the sheet stacking apparatus according to the present invention will be described in detail with reference to the drawings. However, the sheet is typically a thin paper such as a copy paper or a flyer, but is not limited to paper, and the material thereof is not limited. In addition, the sheet is not limited to a single flat plate, but may be a folded sheet.

  FIG. 2 is a schematic side view of the sheet stacking apparatus 21 according to the first embodiment of the present invention, and FIG. 3 is a schematic plan view thereof. In this sheet stacking apparatus 21, an upper surface conveyance vacuum conveyor 22 that adsorbs and conveys the sheet R on the upper surface and a lower surface conveyance vacuum conveyor 23 that adsorbs and conveys the sheet R on the lower surface are arranged so as to partially overlap. Yes.

  The upper surface conveyance vacuum conveyor 22 includes a pair of conveyance belts 29, and each belt 29 is provided with a vacuum suction hole 28 at a constant pitch. The upper surface conveyance vacuum conveyor 22 adsorbs the lower surface of the sheet R to the upper surface of the belt 29 through the vacuum suction holes 28 and conveys the sheet R by running the belt 29. The lower surface transfer vacuum conveyor 23 includes a pair of transfer belts 31, and each belt 31 is provided with a vacuum suction hole 30 at a constant pitch. The lower surface conveyance vacuum conveyor 23 adsorbs the upper surface of the sheet R to the lower surface of the belt 31 through the vacuum suction holes 30 and conveys the sheet R by running the belt 31. The upper surface of the front end portion of the upper surface conveyance vacuum conveyor 22 and the lower surface of the rear end portion of the lower surface conveyance vacuum conveyor 23 overlap with each other with a gap of about the thickness of the sheet R. The lower surface of the front end portion of the lower surface transfer vacuum conveyor 23 is a non-adsorption region. In the non-adsorption region, the vacuum suction hole 30 of the lower surface conveyance vacuum conveyor 23 is closed, and when the sheet R sucked and conveyed by the lower surface of the lower surface conveyance vacuum conveyor 23 reaches the non-adsorption region, the sheet R is conveyed under the surface. The suction force of the vacuum conveyor 23 is released.

  Under the non-adsorption region of the lower surface conveyance vacuum conveyor 23, a cradle 24 for collecting sheets R is installed, and the cradle 24 is moved up and down by the power of a motor, an air actuator, or the like. At a position corresponding to the front end portion of the cradle 24, a position aligning plate 25 for positioning and aligning the end of the sheet R is erected vertically. Further, a vertical jogging plate 26 (jogger) is provided behind the alignment plate 25 and on both sides of the cradle 24. The jogging plate 26 vibrates slightly in the front-rear direction, and the sheets R stacked with the sheet R sandwiched between the jogging plate 26 and the alignment plate 25 are aligned in the front-rear direction. The sheet R is aligned in the width direction with the sheet R sandwiched between the jogging plates 26 of the part.

  The lower surface transport vacuum conveyor 23 is provided with a counter 32 for counting the number of sheets R being transported by the lower surface transport vacuum conveyor 23. The counter 32 may be a contact type counter using a micro switch or a non-contact type counter using a photoelectric sensor or the like.

  Further, a temporary holding plate 27 for temporarily holding the sheet R is provided in front of the lower surface conveyance vacuum conveyor 23. The temporary holding plate 27 is disposed between the left and right belts 31 of the lower surface conveyance vacuum conveyor 23 and outside the belt 31 and protrudes toward the front portion of the lower surface conveyance vacuum conveyor 23 or the front portion of the lower surface conveyance vacuum conveyor 23. It can be withdrawn from the top and bottom, and can be moved up and down. The temporary holding plate 27 receives the sheet R that is conveyed instead of the receiving table 24 while the receiving table 24 is discharging the sheet R, and the sheet R that has been sent by the lower surface transfer vacuum conveyor 23. It has a function of forcibly peeling it from the lower surface conveyance vacuum conveyor 23 in the non-adsorption region and separating it from the subsequent sheet R.

  Next, an operation in which the sheet stacking apparatus 21 having the above structure stacks and carries out a predetermined number of sheets R will be described. A large amount of sheets R are stacked and stored at the rear end portion of the upper surface conveyance vacuum conveyor 22. The sheets R are sent out from the storage place in a state of being almost half overlapped with each other, and are conveyed with the lower surface being adsorbed by the belt 29 of the upper surface conveyance vacuum conveyor 22. When the sheet R conveyed by the upper surface conveyance vacuum conveyor 22 reaches the front end portion of the upper surface conveyance vacuum conveyor 22, the sheet R is released from the suction force by the upper surface conveyance vacuum conveyor 22 and is applied to the belt 31 of the lower surface conveyance vacuum conveyor 23 on the upper surface. Is adsorbed and conveyed by the lower surface conveyance vacuum conveyor 23. Since the sheets R are transported by the upper surface transport vacuum conveyor 22 and the lower surface transport vacuum conveyor 23 in a state of being almost half overlapped with each other, both the conveyors 22, 23 are compared with the case where the sheets R are transported so as not to overlap. Even if the transport speed is the same, the number of sheets R sent per unit time increases, and the processing speed of the sheet R increases.

  In addition, the upper surface of the front half of the sheet R being conveyed while being overlapped in this manner is adsorbed by the lower surface conveyance vacuum conveyor 23, and the length of the non-adsorption region of the lower surface conveyance vacuum conveyor 23 is the surface to be adsorbed of the sheet R Is almost equal to or slightly longer than

  The counter R 32 counts the number of sheets R that have been sucked and conveyed by the lower surface conveyance vacuum conveyor 23. When the suction surface of the sheet R reaches the non-adsorption region of the lower surface conveyance vacuum conveyor 23, the front end of the sheet R stops against the alignment plate 25, and the sheet R is separated from the adsorption force by the lower surface conveyance vacuum conveyor 23. As shown in FIG. 2, it is released and falls onto the cradle 24 by its own weight and is accumulated on the cradle 24. Further, the sheets R stacked on the cradle 24 are aligned in the front-rear direction by the jogging plate 26 and the alignment plate 25 and are aligned in the width direction by the jogging plates 26 on both sides. At this time, the temporary holding plate 27 stands by at a position slightly higher than the lower surface of the lower surface transport vacuum conveyor 23 in the non-adsorption region of the lower surface transport vacuum conveyor 23.

  In this way, when the counter 32 detects that the number of sheets R has reached a predetermined number while the sheets R are stacked on the receiving tray 24 while counting the number of sheets R passing by the counter 32, FIG. As shown in 4 (a), the temporary holding plate 27 immediately descends below the lower surface of the lower surface transfer vacuum conveyor 23. As a result, the predetermined number of sheets R conveyed by the lower surface conveyance vacuum conveyor 23 are forcibly pushed down by the temporary holding plate 27 and between the subsequent sheets R (the first sheet of the next stack). As shown in FIG. 4B, the temporary holding plate 27 protrudes toward the gap. Therefore, the predetermined number of sheets R are pushed down by the temporary holding plate 27 and are surely accumulated on the cradle 24. On the contrary, the subsequent first sheet R is prevented from being placed on the cradle 24. And is held on the upper surface of the temporary holding plate 27.

  Thereafter, as shown in FIG. 5, the cradle 24 in which a predetermined number of sheets R are aligned and stacked is lowered downward to move to the discharge position, and the predetermined number of sheets R aligned on the cradle 24 is moved. The accumulated body is discharged from the receiving table 24 and sent to the next process. In order to discharge the stack of sheets R, the cradle 24 may be configured with a belt conveyor, and the stack of sheets R may be sent out by the belt conveyor, or the stack with a pusher using an air cylinder. May be extruded.

  On the other hand, during the work process of unloading the aggregate on the cradle 24, the sheet R conveyed from the lower surface conveyance vacuum conveyor 23 is received by the temporary holding plate 27 and placed on the temporary holding plate 27. Accumulated. The stacked body of sheets R stacked on the temporary holding plate 27 is aligned by the jogging plate 26 and the alignment plate 25. The alignment plate 25 and the jogging plate 26 are separate parts from the cradle 24 and the temporary holding plate 27, and are shared by the cradle 24 and the temporary holding plate 27, so that the number of parts can be reduced. ing.

  As shown in FIG. 6A, when the cradle 24 that has been emptied by discharging the stack of sheets R rises to the original position, the temporary holding plate 27 aligns the end of the stacked sheets R with the alignment plate. The sheet R is retracted while being brought into contact with 25, and is dropped onto the receiving table 24 on the temporary holding plate 27 as shown in FIG. Thereafter, the sheets R conveyed by the lower surface conveyance vacuum conveyor 23 are stacked on the receiving table 24. On the other hand, the retracted temporary holding plate 27 rises again above the lower surface of the lower surface transport vacuum conveyor 23 and waits at a position where it protrudes to the front end of the lower surface transport vacuum conveyor 23.

  Therefore, according to the sheet stacking device 21, it is possible to reliably separate the sheets R at the timing when the predetermined number of sheets are reached and to stack the predetermined number of sheets R on the receiving table 24. In particular, even when the conveyance speed of the lower surface conveyance vacuum conveyor 23 is high, the sheets R are overlapped so that the number of sheets R to be sent per unit time is large, or the sheet R is thin paper, A predetermined number of sheets can be counted and reliably separated, and a large amount of sheets R can be processed efficiently in a short time. Further, there is no possibility that the sheet R falls off the sheet stacking apparatus 21.

  FIG. 7 is a schematic side view showing a sheet stacking apparatus 41 according to Embodiment 2 of the present invention, and FIG. 8 is a schematic plan view thereof. In the first embodiment, the temporary holding plate 27 has both a function of temporarily receiving the sheet R and a function of creating a space for inserting the temporary holding plate 27 between the sheets R. Then, this function is configured separately by the temporary holding plate 43 and the vacuum part 42. Since the other constituent elements are the same as those in the first embodiment, the same constituent elements as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the second embodiment, the temporary holding plate 43 is installed in front of the lower surface transfer vacuum conveyor 23 and protrudes below the non-adsorption region of the lower surface transfer vacuum conveyor 23 or retracts forward. . The vacuum part 42 has a negative pressure inside, and a vacuum suction hole is opened on the upper surface thereof so that the sheet R can be sucked on the upper surface. Moreover, the vacuum part 42 is made to protrude to the non-adsorption | suction area | region of the lower surface conveyance vacuum conveyor 23, or is retracted ahead, and can also raise / lower now up and down.

  In the sheet stacking device 41, when the sheets R are stacked on the cradle 24, as shown in FIG. 7, the vacuum part 42 and the temporary holding plate 43 are located in front of the lower surface transport vacuum conveyor 23. Retracted.

  When a predetermined number of sheets R fall on the cradle 24 and a subsequent sheet R (the first sheet of the next stack) is detected by the counter 32, as shown in FIG. Immediately, the vacuum part 42 protrudes to the lower surface of the non-adsorption region of the lower-surface transport vacuum conveyor 23 and adsorbs the lower surface of the first sheet R so that the first sheet R does not fall on the cradle 24. To do. 9B, the temporary holding plate 43 protrudes below the first sheet R held by the vacuum part 42, and the temporary holding plate 43 holds the sheet R while the vacuum part 42 holds the sheet R. Descend to the top. Next, as shown in FIG. 10, the vacuum unit 42 releases the sucked first sheet R, and moves backward while the first sheet R remains on the temporary holding plate 43. Then, the second and subsequent sheets R are sequentially stacked on the temporary holding plate 43. On the other hand, the cradle 24 on which a predetermined number of sheets R are stacked descends and discharges the stack of sheets R.

  The cradle 24 that has finished discharging the stack of sheets R rises again below the temporary holding plate 43. When the empty cradle 24 is returned below the temporary holding plate 43 as shown in FIG. 11 (a), the temporary holding plate 43 is moved forward as shown in FIG. 11 (b). When the temporary holding plate 43 moves backward, the sheet R on the temporary holding plate 43 is in contact with the alignment plate 25, so that it remains in its original position and falls onto the cradle 24. Thereafter, the sheets R conveyed from the lower surface conveyance vacuum conveyor 23 are continuously accumulated on the receiving table 24.

  In the second embodiment, a predetermined number of sheets R are sequentially conveyed by repeating the above operation. In the second embodiment, the first sheet R is adsorbed by the vacuum part 42 so that it can be reliably separated from the last sheet R of the previous stack, so that the sheet R is conveyed at high speed. Even when the sheets R are thin paper, or when a large amount of sheets R are supplied per unit time, the number of stacked bodies can be accurately aligned. Further, since the first sheet R is adsorbed by the vacuum part 42, there is no possibility of dropping even if it hits the temporary holding plate 43 when the temporary holding plate 43 protrudes.

  As a modification of the second embodiment, the vacuum part 42 has a vacuum suction hole on the lower surface, and the vacuum part 42 sucks the upper surface of the first sheet R and holds the first sheet R. It does not matter if it is

  12A and 12B are schematic side views showing the sheet stacking apparatus 51 according to the third embodiment of the present invention. In the third embodiment, the temporary holding plate 53 has a function of temporarily receiving the sheet R, and the air blowing portion 52 has a function of creating a space for inserting the temporary holding plate 53 between the sheets R. . Since the other constituent elements are the same as those in the first embodiment, the same constituent elements as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the third embodiment, the temporary holding plate 53 is installed in front of the lower surface transfer vacuum conveyor 23, and protrudes downward from the front of the lower surface transfer vacuum conveyor 23, or is retracted forward. The air blowing part 52 is installed slightly above the lower surface of the non-adsorption region of the lower surface conveyance vacuum conveyor 23, and can blow out air vigorously downward from an air ejection hole provided on the lower surface.

  In the sheet stacking apparatus 51, when the predetermined number of sheets R are counted by the counter 32 and reach the non-adsorption region, the air is blown out from the air blowing unit 52 and the predetermined number of sheets R is collected. R is blown down. Therefore, since a gap is formed between the predetermined number of sheets R and the first sheet R of the next stack, the temporary holding plate 53 protrudes into this gap. As a result, the predetermined number of sheets R are stacked on the receiving table 24, and the subsequent first sheet R falls on the temporary holding plate 53 and is held on the temporary holding plate 53. Since the subsequent operation is the same as that in the first embodiment, the description thereof is omitted.

  Also in the third embodiment, since the predetermined number of sheets R are blown off by the air blowing section 52, the first sheet R of the next stack can be reliably separated. Even when the sheet is transported, the sheet R is thin, or a large amount of the sheet R is supplied per unit time, the number of the stacked bodies can be accurately aligned. Further, according to the third embodiment, it is not necessary to move the air blowing section 52, and the temporary holding plate 53 only needs to be moved horizontally, so that the mechanical structure is simplified.

FIG. 1 is a schematic side view showing a conventional integrated device. FIG. 2 is a schematic side view showing the sheet stacking apparatus according to the first embodiment of the present invention. FIG. 3 is a schematic plan view showing the same sheet stacking apparatus. 4A and 4B are explanatory diagrams for explaining the operation of the sheet stacking apparatus according to the first embodiment. FIG. 5 is an explanatory diagram for explaining the operation of the sheet stacking apparatus according to the first embodiment. 6A and 6B are explanatory diagrams for explaining the operation of the sheet stacking apparatus according to the first embodiment. FIG. 7 is a schematic side view showing a sheet stacking apparatus according to Embodiment 2 of the present invention. FIG. 8 is a schematic plan view showing the same sheet stacking apparatus. FIG. 9A and FIG. 9B are explanatory diagrams for explaining the operation of the sheet stacking apparatus according to the second embodiment. FIG. 10 is an explanatory diagram for explaining the operation of the sheet stacking apparatus according to the second embodiment. FIG. 11A and FIG. 11B are explanatory diagrams for explaining the operation of the sheet stacking apparatus according to the second embodiment. FIGS. 12A and 12B are schematic side views for explaining the sheet stacking apparatus according to the third embodiment of the present invention and its operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Sheet stacking device 22 Upper surface conveyance vacuum conveyor 23 Lower surface conveyance vacuum conveyor 24 Base 25 Position alignment plate 26 Jogging plate 27 Temporary holding plate 28 Vacuum suction hole 29 Belt 30 Vacuum suction hole 31 Belt 32 Counter 41 Sheet accumulation device 42 Vacuum part 43 Temporary holding plate 51 Sheet stacking device 52 Air blowing part 53 Temporary holding plate R sheet

Claims (6)

A transport conveyor that sequentially transports the sheets, a counter that detects and counts the sheets sent by the transport conveyor, and a cradle that receives and accumulates the sheets transported by the transport conveyor, a predetermined number of sheets on the cradle A sheet stacking device for stacking sheets and taking out a stack of sheets stacked on a cradle,
When the counter detects the predetermined number of sheets constituting the stack or the first sheet constituting the next stack, the predetermined number of sheets and the subsequent first sheet are separated. Separating means for causing
The first sheet and the subsequent sheets are temporarily held by being inserted between the predetermined number of sheets separated by the separation means and the first sheet, and a stack of sheets is formed. A temporary holding plate for transporting the temporarily held sheet to a cradle that has been unloaded and emptied;
A sheet stacking apparatus comprising:   The sheet stacking apparatus according to claim 1, wherein the conveyor conveys the sheets in a state where the sheets partially overlap each other.   3. The sheet stacking apparatus according to claim 1, wherein the transport conveyor is a vacuum conveyor that sucks and transports a sheet to a lower surface. The temporary holding plate also serves as the separating means;
The predetermined number of sheets that the lower surface of the temporary holding plate constitutes the stack is pushed down from the lower surface of the conveyor to separate the predetermined number of sheets from the subsequent first sheet. The sheet stacking apparatus according to claim 3, wherein the sheets are stacked on a cradle and the first sheet is placed on a temporary holding plate. The separating means is constituted by a vacuum part that adsorbs the lower surface of the sheet,
The vacuum part adsorbs the lower surface of the first sheet constituting the stack to separate the first sheet from the predetermined number of sheets immediately before it, and to receive the predetermined number of sheets. And the first sheet is placed on the temporary holding plate inserted between the predetermined number of sheets and the first sheet. The sheet stacking apparatus according to claim 3. The separating means is constituted by an air blowing part for blowing air on the upper surface of the sheet,
The predetermined number of sheets constituting the stack are pushed down from the lower surface of the conveyer by blowing air from the air blowing unit to separate the predetermined number of sheets from the subsequent first sheet, and the predetermined number of sheets The first sheet is stacked on a receiving table, and the first sheet is placed on the temporary holding plate inserted between the predetermined number of sheets and the first sheet. The sheet stacking apparatus according to claim 3, wherein

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