Sheet conveying device

Abstract

To improve transport property on a sheet transport device for promoting sheet transportation using an air stream.SOLUTION: A sheet transport device (1F) includes: a guide member 10 for guiding movement of a sheet S1; and a blower device 20. The guide member includes a guide surface 11 facing a sheet transportation space. The guide surface is provided with an air outlet 12. An air stream F blown out from the air outlet is generated by air blowing force by the blower device. The air current and / or an inclination of the guide surface relative to a gravity direction provide thrust in a transportation direction to a sheet.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a sheet transport device. [Background technology]

[0002] In Patent Documents 1 and 2, when sheets such as cutting waste are transported along a transport path, an air current is generated in the downstream direction of the transport path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-212827 A [Patent Document 2] JP 2017-213642 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, the air flow presses the sheet against the guide surface, causing phenomena such as increased friction, frictional electrification, and the electrostatic force of the charged sheet causing the sheet to stick to the guide surface, making it difficult for the sheet to slide along the guide surface, which may result in a deterioration in conveyability.

[0005] The present invention has been made in consideration of the above problems in the conventional technology, and an object of the present invention is to improve the conveyance performance in a sheet conveying device that utilizes an air flow to promote sheet conveyance. [Means for solving the problem]

[0006] A sheet conveying device according to one aspect of the present invention includes a guide member that guides a sheet, which is a cut waste that has been cut by a cutting device and dropped, to a waste storage section, and a blower device. a sheet conveying device, the cutting device including a first cutting module that cuts a sheet in a conveying direction and a second cutting module that cuts a sheet in a direction perpendicular to the conveying direction, the scrap storage unit being disposed below the second cutting module, and the guide member guiding a sheet that has been cut and dropped by the first cutting module to the scrap storage unit;The guide member has a guide surface facing the sheet transport space and inclined toward the transport direction with respect to the direction of gravity, and a second guide surface rising from both ends of the guide surface in a direction perpendicular to the transport direction, and the guide surface and the second guide surface are provided with air outlets, the air blowing direction from the blowing device is horizontal, and the air blowing direction from the air outlet of the guide surface is inclined toward the transport direction with respect to the direction of gravity, and an air flow is generated that blows out from the air outlet due to the blowing force of the blowing device, and the air flow and the inclination of the guide surface with respect to the direction of gravity provide a propulsive force to the sheet in the transport direction. Effect of the Invention

[0007] According to the present invention, the air flow is utilized to promote the transport of the sheet, the sticking of the sheet to the guide surface is suppressed, friction is reduced, and transportability is improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a sheet conveying device according to an embodiment of the present invention. [Diagram 2] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Diagram 3] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of a guide member and a sheet on which electrostatic force acts. FIG. [Diagram 5] 4A to 4C are cross-sectional views of a guide member and a sheet on which electrostatic force acts, and a force vector diagram. [Figure 6] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Figure 7] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Figure 8] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Figure 9] FIG. 11 is a cross-sectional view of a sheet conveying device according to another embodiment of the present invention. [Figure 10]FIG. 13 is an exploded perspective view of a sheet conveying device according to another embodiment of the present invention. [Figure 11] FIG. 11 is an assembled perspective view of the configuration of FIG. 10. [Figure 12] FIG. 13 is a perspective view of a sheet conveying device according to another embodiment of the present invention. [Figure 13] FIG. 2 is a front view of a fixing frame of the blower according to an embodiment of the present invention; [Figure 14] This shows a state in which a blower is attached to the frame of FIG. [Figure 15] FIG. 2 is a schematic diagram showing an example of a blower device. [Figure 16] FIG. 4 is a plan view of a guide surface illustrating an example of an arrangement of air outlets according to an embodiment of the present invention. [Figure 17] FIG. 11 is a plan view of the guide surface showing another example of the arrangement of the air outlets in the embodiment of the present invention. [Figure 18] FIG. 11 is a plan view of the air outlet showing variations in shape of the air outlet according to one embodiment of the present invention. [Figure 19] 1 is a schematic cross-sectional view of a cutting device according to an embodiment of the present invention; [Figure 20] FIG. 2 is a plan view of a sheet of paper including example cut lines. [Figure 21] FIG. 13 is a perspective view of a sheet conveying device according to another embodiment of the present invention. [Figure 22] 22 is a cross-sectional view taken along line AA shown in FIG. 21. [Figure 23] 22 is a cross-sectional view taken along line BB shown in FIG. 21. [Figure 24] 1 is a graph showing the relationship between the basis weight of a sheet and the effective air propulsion force minus the weight offset. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The following is an embodiment of the present invention, and is not intended to limit the present invention.

[0010] As shown in FIG. 1, a sheet conveying apparatus 1A according to an embodiment of the present invention includes a guide member 10 for guiding the movement of a sheet S1, and a blower 20. The guide member 10 guides the movement of a sheet S1. The guide member 10 has a guide surface 11 facing the transport space for the sheet S1. The guide surface 11 is provided with an air outlet 12 . Then, an airflow F is generated by the air blowing force of the air blowing device 20 and blown out from the air outlet 12. The airflow F and / or the inclination of the guide surface 11 with respect to the direction of gravity imparts a propulsive force P1 to the sheet S1 in the transport direction.

[0011] In the sheet transport device 1A, the guide surface 11 is not inclined with respect to the direction of gravity, that is, it is horizontal. Also, the blowing direction of the airflow F from the air outlet 12 is inclined toward the transport direction with respect to the direction of gravity. Therefore, the airflow F applies a propulsive force P1 in the transport direction to the sheet S1. In FIG. 1, the vectors of the airflow force F1, gravity G1, and propulsive force P1 acting on the sheet S1 are shown (G1 indicates the direction of gravity, and P1 indicates the transport direction). In order to apply a propulsive force P1 in the conveying direction to the sheet S1 by the air flow F, the air flow F has an inclination θ, where 0<θ<90°.

[0012] The guide member 10 has an air passage 13 formed in the guide member 10 and having an air outlet 12 at one end. In the sheet transporting device 1A, the air passage 13 is perpendicular to the guide surface 11. As shown in FIG.

[0013] The airflow F generates a lift force Y1 on the sheet S1, thereby reducing or eliminating the friction force between the guide surface 11 and the sheet S1. In addition, the airflow F applies a propulsive force P1 to the sheet S1, moving the sheet S1 in the conveying direction. Sticking of the sheet S1 to the guide surface 11 can be suppressed, friction can be reduced, and the air flow F can be utilized to promote the conveyance of the sheet S1.

[0014] A sheet conveying apparatus 1B according to another embodiment shown in FIG. 2 differs from the sheet conveying apparatus 1A in that the air passage 13 is provided with inclinations θ1 and θ2, but otherwise has the same configuration. In the sheet conveying device 1A, the air passage 13 has inclinations θ1 and θ2 with respect to the guide surface 11. These inclinations θ1 and θ2 are inclined in the same direction as the inclination θ of the airflow F, and provide a rectifying effect to maintain the blowing angle of the airflow F. In such a case, the rectifying effect can be improved by implementing a structure in which the air passage 13 is made narrower and longer. Figure 2 shows the case where 0<θ<90°, θ1=θ2, and 0<θ1<90.

[0015] 3, a sheet conveying device 1C according to another embodiment is different from the sheet conveying device 1B in that θ1, θ2 in the figure are set to θ1>θ2, and the air passage 13 is tapered. In this case, the air passage 13 has a straightening effect similar to the sheet conveying device 1B, and also has an effect of increasing the speed of the airflow F.

[0016] In the above-described sheet conveying devices 1A-1C, the gas force F1 can be applied to the sheet S1 in the direction opposite to the direction of gravity, thereby facilitating the conveyance of the sheet S1. Factors that determine the electrostatic force that causes sheet S1 to stick to the guide surface include the charge amount of sheet S1 and the Coulomb force that depends on the charge amount of guide member 10. However, in the above embodiment, since guide surface 11 has a cavity (airway 13) due to the blow-out port 12, the total contact area is reduced and the Coulomb force is also mitigated. Furthermore, even if the sheet S1 adheres closely to the guide surface, the sheet S1 is likely to peel off because the guide surface 11 has a cavity (air passage 13) due to the air outlet 12.

[0017] As described above, through the air outlet 12 provided in the guide surface 11, an angle θ is given to the direction of the airflow F relative to the guide surface 11, so that a propulsive force can be applied to the sheet S1. Furthermore, as in the sheet conveying devices 1B and 1C, by providing an angle between the air passage 13 drilled in the guide member 10 and the guide surface 11, a straightening effect can be achieved that regulates the direction of the airflow F relative to the guide surface 11, thereby providing a propulsive force for the sheet S1 to move. Since the gas acts from the rear side of the sheet S1, contact with the guide member 10 is reduced and frictional resistance can be reduced, which is advantageous for the movement of the sheet S1. By providing the air outlet 12 on the guide surface 11, the total contact area between the sheet S1 and the guide member 10 is reduced, which is advantageous for the movement of the sheet S1. As shown in Figures 4 and 5, even if an electrostatic force acts between the sheet S1 and the guide member 10, the contact area is reduced due to the opening area of ​​the air outlet 12, and the adhesive force (pressing force) due to the electrostatic force E1 and gravity G1 is reduced due to the peeling force (Y1) caused by the air flow F, which is favorable for the movement of the sheet S1.

[0018] A sheet conveying apparatus 1D according to another embodiment shown in FIG. 6 differs from the sheet conveying apparatus 1A in that it includes a gas guide member 30, but otherwise has the same configuration. The gas guide member 30 guides the gas blown from the blower 20 to an air passage 13 formed in the guide member 10 and having the air outlet 12 at one end and the air passage 13 at the other end. This allows the gas guide member 30 to achieve a straightening effect on the blowing direction from the blowing port 12 .

[0019] A sheet conveying device 1E according to another embodiment shown in FIG. 7 has multiple air passages 13, an air blowing device 20 whose air blowing direction is vertically upward, and a gas guide member 31, in comparison with the sheet conveying device 1B described above, and has other similar configurations. The gas blown from the blower 20 can be reliably sent to the specific target airways 13, 13 . . .

[0020] A sheet conveying device 1F according to another embodiment shown in Fig. 8 has the same configuration as the sheet conveying device 1A, except that an angle θa is provided on the guide surface 11 and a gas guide member 32 is also provided. 0<θa<90°. That is, the guide surface 11 has an inclination in the conveying direction with respect to the direction of gravity. The blowing direction of the airflow F from the air outlet 12 also has an inclination toward the transport direction with respect to the direction of gravity. Therefore, a propulsive force in the transport direction can be applied to the sheet S1 by the air flow F and the inclination of the guide surface 11 with respect to the direction of gravity. In particular, the sheet conveying device 1F is configured such that the blowing direction of the airflow F is perpendicular to the guide surface 11 and oblique to the direction of gravity and the horizontal direction.

[0021] A sheet conveying device 1G according to another embodiment shown in FIG. 9 is similar to the sheet conveying device 1F described above in that the blowing direction of the air blower 20 is horizontal, the air blowing direction is horizontally oriented, and the blowing direction of the airflow F from the air outlet 12 is horizontal. The rest of the configuration is similar to that of the sheet conveying device 1F described above. Similar to the sheet transporting device 1F, the sheet transporting device 1G can apply a propulsive force to the sheet S1 in the transport direction by the airflow F and the inclination of the guide surface 11 with respect to the gravity direction. The sheet transporting device 1G can increase the propulsive force as a component force of the airflow acting force F1 compared to the sheet transporting device 1F.

[0022] A sheet conveying device 1H according to another embodiment shown in an exploded view of FIG. 10 and an assembly view of FIG. This allows the gas blown from the blower 20 to be sent into the air passage (13) of the guide member 10 and blown out from the air outlet 12 without leaking. 12 shows a sheet conveying device 1J according to another embodiment, in which the guide surface 11 is inclined and a duct member 41 is provided. In this manner, the guide surface 11 can be inclined in the conveying direction.

[0023] As shown in the example of FIG. 14, a plurality of blowers 20 may be installed. In the example shown in Fig. 14, a plurality of blowers 20 are installed on a fixed frame 21 having a plurality of installation openings 22 shown in Fig. 13, and the plurality of blowers 20 are arranged in the width direction perpendicular to the conveying direction. The central, left and right blowers are designated as 20C, 20L and 20R.

[0024] When a plurality of blowing devices 20 are provided in this manner, a configuration can be implemented in which the blowing drive can be switched on and off for each corresponding area on the guide surface. 14, for example, a left-right drive mode is set in which the left and right blowers 20L,R are turned on and the central blower 20C is turned off. In addition, various combinations of blower selection and drive operation are possible, such as a central drive mode in which the left and right blowers 20L,R are turned off and the central blower 20C is turned on, a stop mode in which they are all stopped at once, and an intermittent drive mode in which they are turned on intermittently. "For each corresponding area on the guide surface" refers to each of the blowers when a plurality of blowers are driven one by one to change the distribution of the air outlets 12 on the guide surface 11, i.e., the distribution of the air outlets from which the airflow actually blows out and the amount of air that blows out, is different. This is because it is sufficient that the distribution of the air outlets from which the airflow actually blows out and the amount of air that blows out differ depending on which blower is turned on. The "corresponding regions on the guide surface" may be not only regions that differ in the width direction as in this example, but also regions that differ in the transport direction. It is also possible to install cameras and sensors to have a control device recognize the position of sheet S1, and to use the same control device to control the operation of the blower so that the airflow F acts on sheet S1 efficiently according to the position of sheet S1.

[0025] The blower 20 is composed of one or more of a fan 20F, a compressor 20G, and a diaphragm pump 20H, the schematic diagram of which is shown in FIG.

[0026] 16 and 17, the air outlet 12 is configured to have any shape and size that has an opening area smaller than one side area of ​​the sheet S1 to be conveyed. Shape variations 20A-20G of the air outlet 12 are shown in FIG. 18, but are not limited thereto.

[0027] A configuration in which one air outlet 12 is arranged on the guide surface 11 may be implemented. When a plurality of air outlets 12 are arranged on the guide surface 11, an arrangement such as that shown in FIG. 16 or that shown in FIG. 17 may be implemented. In the configuration shown in FIG. 16, a plurality of air outlets 12 are arranged in an array according to a repeating pattern in which adjacent rows in the transport direction X are at the same position. In the configuration shown in FIG. 17, a plurality of air outlets 12 are arranged in an array according to a repeating pattern in which adjacent rows in the transport direction X are shifted from one another.

[0028] The gas of the airflow F, that is, the gas that is the working fluid generating the airflow F, may be air, carbon dioxide, ozone, or the like. In addition, the gas may contain ionized gas. In this case, when the sheet S1 is charged, the charge can be removed, and the electrostatic adsorption force to the guide surface 11 can be electrically reduced.

[0029] As shown in FIG. 19, a configuration in which a guide member 10 is disposed below a cutting device 50 that cuts a sheet S can be implemented. A cutting device 50 shown in FIG. 19 includes a cutting module 51 that cuts the sheet S in a conveying direction X1, and a cutting module 52 that cuts the sheet S in a direction perpendicular to the conveying direction X1. The cutting module 51 discharges a sheet S1, which is a cutting waste obtained by cutting off the left and right edges of the paper S shown in FIG. A sheet waste container 60 is provided below the sheet S1 in the direction X2 in which the sheet S1 moves from the guide member 10. The sheet S1 discharged onto the guide surface 11 moves on the guide surface 11 in the X2 direction and is stored in the scrap storage section 60. The cutting module 52 discharges the sheet S2, which is the cutting scraps formed by cutting off the leading and trailing ends of the paper S shown in FIG.

[0030] 19, the sheet S1 can be transported to the scrap container 60 by the action of the airflow F, so there is no need to make the inclination of the guide member 10 excessively large as in the case where the inclination is based only on gravity, and a compact configuration can be achieved. The scrap container 60 also does not need to be installed low, so it can be placed in a space-saving manner. The scrap container 60 does not need to be disposed under the multiple cutting modules 51, 52 aligned in the conveying direction X1, and a structure that can easily hold scraps with a small opening area can be achieved. Incidentally, regardless of the example shown in FIG. 19, the guide member 10 may be disposed under a plurality of cutting modules 51, 52 arranged in the conveying direction X1.

[0031] [Example] A sheet conveying device 1K having the configuration shown in Figs. 21 and 22 was implemented to measure the conveying capacity. The sheet conveying device 1K uses a guide member 10 having a guide slope in the conveying direction and an air outlet 12 for blowing out airflow on the left and right side walls of the guide slope. The angle α1 of the guide surface 11 of the guide slope is set to 25° with respect to the horizontal. The throttle angle α2 of the duct 41 in front of the blower is set to 56°. The blowers are center, left and right blowers 20C, 20L and 20R. The thickness dimension 41a of the constant cross-sectional portion beyond the throttle of the duct 41 is set to 20 mm. When an experiment was conducted with a sheet (waste) of a given size (8 x 153 mm) as the transport target and the basis weight was changed in various ways as shown on the horizontal axis of the graph in Figure 24, it was possible to obtain an effective air propulsion force minus the weight offset. The experiment was conducted twice, with graph N1 based on the data from the first experiment and graph N2 based on the data from the second experiment.

[0032] 〔summary〕 The propulsive force that propels the sheet in the conveying direction may be both the airflow force component and the weight component, or may be the former only, or may be the latter only. Although not shown, the latter only configuration is a configuration in which the guide surface is inclined with respect to the horizontal and the airflow from the air outlet is blown vertically upward. In the latter only configuration, the presence of an air outlet from which the airflow blows out on the guide surface reduces the frictional force between the sheet and the guide surface and the electrostatic adsorption force, thereby reducing the propulsion resistance and obtaining a large propulsive force. The condition under which neither the airflow action force nor the weight component acts as a propulsive force to propel the sheet in the conveying direction is that the guide surface is horizontal and the airflow from the air outlet is blown vertically upward. Propulsive force can be obtained by deviating from this condition. [Explanation of symbols]

[0033] 1A-1K Sheet transport device 10 Guide member 11 Guide surface 12 Air outlet 13 Airway 20 Blower 30-33 Gas guide member 40-41 Duct parts 50 Cutting device 51,52 Cutting module 60 Waste collection section F Airflow F1 Airflow Force P1 Propulsion S1 Seat S2 Seat

Claims

1. A sheet conveying device including a guide member that guides a sheet, which is a cutting scrap that has been cut by a cutting device and dropped, to a scrap storage section, and an air blower, The cutting device includes a first cutting module that cuts the sheet in a conveying direction and a second cutting module that cuts the sheet in a direction perpendicular to the conveying direction, The scrap container is disposed below the second cutting module, The guide member guides the sheet cut and dropped by the first cutting module to the scrap storage unit, the guide member has a guide surface facing a sheet transport space and inclined toward a transport direction with respect to a gravity direction, and a second guide surface standing upright from both ends of the guide surface in a direction perpendicular to the transport direction, The guide surface and the second guide surface are provided with air outlets, The blowing direction from the blowing device is horizontal, a blowing direction of the airflow from the blowing port of the guide surface has an inclination toward the conveying direction with respect to the gravity direction, A sheet conveying device in which an air current is generated by the blowing force of the blower device and blown out from the air outlet, and a propulsive force is applied to the sheet in the conveying direction by the air current and the inclination of the guide surface with respect to the direction of gravity.

2. 2. The sheet transport device according to claim 1, wherein the air passage having the air outlet at one end and formed in the guide member is inclined with respect to the guide surface.

3. 2. The sheet transport device according to claim 1, wherein an air passage having one end at the air outlet and formed in the guide member is perpendicular to the guide surface.

4. 4. The sheet conveying device according to claim 1, further comprising a gas guide member that guides the gas blown from the blowing device to an air passage having the blowing outlet at one end and formed in the guide member.

5. The sheet conveying apparatus according to claim 1 , further comprising a duct member connecting the blower and the guide member.

6. 6. The sheet conveying apparatus according to claim 1, wherein the blower is composed of one or more of a fan, a compressor, and a diaphragm pump.

7. 7. The sheet transport device according to claim 1, wherein the air outlet is configured to have an arbitrary shape and size such that the opening area is smaller than one-sided area of ​​the sheet to be transported.

8. The sheet conveying device according to any one of claims 1 to 7, wherein the air outlet is arranged on the guide surface in a single unit or in a plurality of units arranged in a repeating pattern in which adjacent rows in the conveying direction are at the same position or adjacent rows are shifted from each other in the conveying direction.

9. 9. The sheet transport device according to claim 1, wherein the gas in the air flow contains air, carbon dioxide or ozone.

10. 10. The sheet transport device according to claim 1, wherein the gas in the airflow includes ionized gas.

11. 11. The sheet transporting device according to claim 1, wherein a plurality of the air blowing devices are provided, and the air blowing drive can be switched on and off for each corresponding area on the guide surface.

Images