WO2021246176A1

WO2021246176A1 - Vacuum suction wheel

Info

Publication number: WO2021246176A1
Application number: PCT/JP2021/018975
Authority: WO
Inventors: 三輪敏雄
Original assignee: リョービＭｈｉグラフィックテクノロジー株式会社
Priority date: 2020-06-05
Filing date: 2021-05-19
Publication date: 2021-12-09
Also published as: CN115667108A; DE112021003132T5; JP7373464B2; JP2021191708A

Abstract

A vacuum suction wheel that can stably discharge sheets in the discharge unit of a sheet-fed printer is provided.　This vacuum suction wheel is provided with a suction inner tube the axial direction of which is perpendicular to the direction of conveyance of sheets in the discharge unit of the sheet-fed printer, and the internal space of which can be brought to a negative pressure, and a suction outer tube 32 which is positioned radially outside of the suction inner tube and which rotates in the circumferential direction with respect to the suction inner tube, wherein on the outer periphery of the suction outer tube 32, multiple flat surface parts 321…321 are provided intermittently in the circumferential direction; each flat surface part 321 has a flat surface 3211 formed to be smaller in the radial dimension than the area surrounded on both sides in the circumferential direction by the flat surface parts; each flat surface part 321 has multiple suction holes 323… 323 that open without contacting the circumferential-direction edge of the flat surface 3211 and that can communicate with the internal space of the suction inner tube.

Description

Vacuum suction car

The present invention relates to a vacuum suction wheel provided in a discharge section of a sheet-fed printing press and which reduces the transport speed of a sheet-fed sheet.

The vacuum suction wheel is described in, for example, Patent Document 1. In the vacuum suction wheel described in Patent Document 1, a suction outer tube (“rotary suction shell” in Patent Document 1) that is long in the width direction of a sheet of paper, which is a sheet of sheet to be conveyed to a discharge portion, has a plurality of holes. Have. The suction outer tube is a circular tube. The suction outer tube is connected to the vacuum pump, and by driving the vacuum pump, suction force can be generated in the plurality of holes. The ejection section is provided with a paper ejection gripper that sandwiches and conveys the sheet of paper. By applying a driving force to the suction outer tube and rotating it so that the speed in the tangential direction is slower than the moving speed of the paper ejection gripper, the sheet paper after being released from the paper ejection gripper is sucked into the suction outer tube. By sucking (specifically, a plurality of holes of the suction outer tube), the transport speed of the sheet of paper, that is, the paper ejection speed can be reduced.

Japanese Patent No. 3332684

However, since this conventional vacuum suction wheel has a circular tubular shape, its outer peripheral surface is a curved surface with a constant curvature. On the other hand, the surface of the sheet (sheet paper) is flat. For this reason, since the curved surface (vacuum suction wheel) is in contact with the flat surface (sheet), the two are only in close contact with each other in a substantially linear shape, which makes it difficult to perform effective suction. Therefore, the vacuum suction wheel is used. It was difficult to decelerate the seat. And, due to this, a sheet ejection failure may occur.

In particular, when a thick sheet such as thick paper is used, the weight of the sheet is heavier than that of a thin sheet, and the surface is hardly deformed along the outer peripheral surface of the vacuum suction wheel. It was even harder to do. When such a thick sheet is used, for example, since the sheet ejection speed is set to a low speed, there is a problem that the printing efficiency is lowered.

In view of the above problems, it is an object of the present invention to provide a vacuum suction vehicle capable of stably discharging a seat at a discharge unit.

The vacuum suction wheel according to the present invention is provided in the discharge section of the sheet-fed printing machine, and sucks the sheet-fed sheet transported to the discharge section on the outer peripheral surface while rotating along the transport direction. In a vacuum suction wheel that reduces the transfer speed of the sheet, a suction inner tube that is a straight pipe fixed at the discharge portion so that the axial direction is orthogonal to the transfer direction and can make the internal space negative pressure, and the above. It is a straight pipe located outside the diameter of the suction inner pipe, and includes a suction outer pipe that rotates in the circumferential direction with respect to the suction inner pipe. Each of the plurality of plane portions is a plane orthogonal to the radial direction, and is formed to have a smaller radial dimension than the portion sandwiched by the plane portions in the circumferential direction. Each of the plurality of plane portions is a plurality of suction holes opened so as not to be in contact with the circumferential end edge of the plane, and a plurality of suction holes capable of communicating with the internal space of the suction inner tube. It is a vacuum suction wheel characterized by having a suction hole of.

According to the above configuration, since the flat surface portion abuts on the sheet of paper in a plane, it is easier to decelerate the sheet of paper as compared with the configuration in which the curved surface (suction outer tube) and the flat surface (sheet) abut on each other. ..

Further, the plane may be continuously formed in the axial direction.

According to the above configuration, since the planes continuous in the axial direction uniformly contact the sheet, the sheet can be effectively sucked.

Further, the outer peripheral portion of the suction outer tube is provided with the flat surface portion and the circumferential surface portion alternately in the circumferential direction, and the circumferential surface portion has a curved surface having a constant radial dimension. good.

According to the above configuration, for example, a suction outer tube can be easily obtained by chamfering a circular tube which is a material.

According to the present invention, since the flat surface portion of the suction outer tube abuts on the sheet in a plane, the sheet is aspirated by the suction outer tube as compared with the configuration in which the curved surface (suction outer tube) and the flat surface (sheet) abut. It is easy to decelerate by making it adhere to. Therefore, it is possible to stably discharge the sheet at the discharge unit.

It is a figure which shows simply the structure around the discharge part of the sheet-fed printing press provided with the vacuum suction wheel which concerns on one Embodiment of this invention. It is a perspective view which shows the vacuum suction wheel. It is sectional drawing cut in the radial direction which shows the vacuum suction wheel. It is a side view which shows the suction outer tube of the vacuum suction wheel. (A) is a sectional view taken along the line VV of FIG. 4, and (b) is an enlarged view of a main part of (a). It is a side view which shows the suction outer tube in the vacuum suction wheel which concerns on other embodiment of this invention. 6 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 6 is a cross-sectional view taken along the line VIII-VIII of FIG.

Hereinafter, the vacuum suction wheel 3 according to the two embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vacuum suction wheel 3 of the present embodiment is provided in the ejection section (paper ejection section) 2 of the sheet-fed printing press 1 as in the conventional one. Then, the function of lowering the transport speed of the sheet-sheet S by sucking the sheet-sheet S as a sheet-like sheet conveyed to the discharge unit 2 on the outer peripheral surface while rotating along the transport direction. Have. The vacuum suction wheel 3 constitutes a part of a vacuum suction device that reduces the transport speed of the sheet paper S in the discharge unit 2.

The vacuum suction wheel 3 positions each of the plurality of paper ejection grippers 21 provided on the paper ejection chain 22 with circles in the paper ejection gripper 21 (in FIG. 1 in FIG. 1), the paper ejection gripper 21 that sandwiches and conveys the sheet paper S in the ejection unit 2 It is located below the movement locus (which is abbreviated only). The paper ejection gripper 21 releases the sheet paper S on the front side (downstream side) in the transport direction with respect to the vacuum suction wheel 3. The release position of the sheet paper S is adjustable. The released sheet paper S moves in the transport direction due to inertia, and is lowered by a downward air flow generated by a fan (not shown) provided in the discharge unit 2. During the movement due to this inertia, the sheet paper S is decelerated by being sucked by the vacuum suction wheel 3. The decelerated sheet paper S has an edge on the front side in the transport direction hitting the front guide 23 provided in the discharge section 2, and the edge on the rear side in the transport direction is guided by the back guide 24 provided in the discharge section 2. Both end edges in the width direction are guided by a side guide (not shown) provided in the discharge unit 2, so that the paper stops at a fixed position and is neatly stacked in the vertical direction on the pallet P prepared in the discharge unit 2. Be done.

The vacuum suction wheel 3 has the appearance shown in FIG. 2, and includes a suction inner pipe 31 and a suction outer pipe 32 as shown in FIG. The suction inner pipe 31 is provided so that the axial direction is orthogonal to the transport direction of the sheet paper S in the discharge portion 2, and is a straight pipe fixed in the vacuum suction wheel 3. The suction outer pipe 32 is a straight pipe located outside the diameter of the suction inner pipe 31 and covers the suction inner pipe 31, and is provided so as to rotate in the circumferential direction with respect to the suction inner pipe 31. The suction outer tube 32 is configured as one long straight tube in the width direction of the sheet paper S, that is, in the direction orthogonal to the transport direction of the sheet paper S. The suction inner tube 31 functions as a support shaft that rotatably supports the suction outer tube 32. Both ends of the suction inner tube 31 are connected to a suction mechanism 4 that constitutes a part of the vacuum suction device. The suction mechanism 4 is provided at both ends of the vacuum suction wheel 3. The suction mechanism 4 is connected to a vacuum pump (not shown), and by driving the vacuum pump, the internal space 31S of the suction inner tube 31 can be made a negative pressure via the suction mechanism 4.

The suction inner tube 31 has a plurality of elongated holes 311 ... 311 formed along the axial direction. Each elongated hole 311 penetrates the suction inner tube 31 in the radial direction. The suction inner pipe 31 is fixed to the vacuum suction wheel 3 so that the plurality of elongated holes 311 ... 311 are located on the upper side. The fixed position of the suction inner pipe 31 in the vacuum suction wheel 3 can be changed in the circumferential direction. The axial formation positions of the plurality of elongated holes 311 ... 311 coincide with the formation positions of the plurality of suction holes 323 ... 323 formed in the suction outer tube 32. As a result, as the suction outer tube 32 rotates, the plurality of suction holes 323 ... 323 of the suction outer tube 32 that overlap with the plurality of elongated holes 311 ... 311 of the suction inner tube 31 have a negative pressure. By communicating with the internal space 31S of 31, the suction outer tube 32 can suck the sheet paper S.

The suction outer tube 32 rotates so that the speed in the tangential direction (horizontal direction in this embodiment) is lower than the moving speed of the paper ejection gripper 21 in the moving direction 21M (see FIG. 1). In this embodiment, a gear 324 is provided at one end of the suction outer pipe 32. On the other hand, the suction mechanism 4 is connected to a motor (not shown), and the driving force of the motor is transmitted to the suction outer pipe 32 via the gear 324, so that the vacuum suction wheel 3 is viewed from the axial direction in FIG. The suction outer tube 32 of the above rotates counterclockwise.

As shown in FIG. 4, a plurality of flat surface portions 321 ... 321 are intermittently provided on the outer peripheral portion of the suction outer tube 32 in the circumferential direction of the suction outer tube 32. In this embodiment, each flat surface portion 321 is provided at 20 places. As shown in FIGS. 5A and 5B, a flat surface portion 321 and a circumferential surface portion 322 are alternately provided on the outer peripheral portion of the suction outer pipe 32 in the circumferential direction of the suction outer pipe 32. The flat surface portion 321 and the circumferential surface portion 322 are provided at equal angular intervals in the circumferential direction. The quantity and the circumferential dimension of each of the flat surface portion 321 and the circumferential surface portion 322 can be appropriately determined. The circumferential surface portion 322 has a curved surface 3221 having a constant radial dimension, that is, a constant curvature.

Each plane portion 321 is a plane orthogonal to the radial direction in the suction outer tube 32, and is compared with a portion sandwiched between the two

plane portions

321 and 321 in the circumferential direction (circumferential surface portion 322 in the present embodiment). It has a plane 3211 formed with a small radial dimension, which is a radial distance from the center. In the present embodiment, the formation ranges of the flat surface portions 321 and the flat surface 3211 are the same, but as in the second embodiment described later, the flat surface portions 321 (groove-shaped portion) and the flat surface 3211 (groove-shaped portion) are formed. The formation ranges of the bottom surface) do not have to match. The plane 3211 is orthogonal to the radial virtual line passing through the center of the suction outer tube 32 in the cross-sectional shape cut in the radial direction. That is, the virtual line coincides with the normal of the plane 3211. Further, the plane 3211 is formed with a uniform width in the circumferential direction with the plane 3211 as a reference. That is, the virtual line passes through the center of the plane 3211 in the width direction. In the cross-sectional shape cut in the radial direction, the radial dimension which is the radial distance from the center of the suction outer pipe 32 of the plane 3211 is the radial dimension of the curved surface 3221 of the circumferential surface portion 322, that is, the radial direction rather than the radius. Small except for the edges. Regarding the boundary between the flat surface portion 321 and the circumferential surface portion 322 (peripheral end edge of each portion), the radial dimensions are the same, and the

respective portions

321 and 322 are connected without a step. It should be noted that the boundary may be gently rounded.

In each plane portion 321 the plane 3211 is continuously formed in the axial direction. By forming the plane 3211 in this way, the plane 3211 (one flat surface 3211) continuous in the axial direction uniformly abuts on the sheet paper S. That is, the flat surface portion 321 comes into contact with the sheet paper S in a plane. For this reason, compared to the conventional configuration in which a curved surface (suction outer tube) and a flat surface (sheet paper) are in contact with each other, each suction hole 323 during suction and the surface or printed surface of the sheet paper S are in contact with each other. Since air leakage is less likely to occur between them and the two can be brought into close contact with each other, the suction force is less likely to be lost and the sheet paper S can be effectively sucked. Therefore, since the sheet paper S is easily decelerated by suction, the stacking of the sheet sheet S is not disturbed, and stable paper ejection can be performed in the ejection unit 2. Further, it is possible to prevent the edge of the sheet S from being scratched or dented due to the vigorous collision of the sheet S with the front guide 23.

Here, the circumferential surface portion 322 corresponds to a portion that has not been chamfered when the flat surface portion 321 is formed by chamfering the outer peripheral surface of the circular pipe, which is the material of the suction outer pipe 32, by, for example, cutting. do. As described above, the suction outer tube 32 in which the flat surface portion 321 and the circumferential surface portion 322 are alternately provided can be easily obtained by chamfering the circular tube or the like. Therefore, for example, the outer peripheral surface of the circular pipe can be machined by cutting, which is a general process, to form the flat surface portion 321. The flat surface portion 321 and the circumferential surface portion 322 are buffed to prevent the sheet paper S from being caught.

Each flat surface portion 321 of the present embodiment is longer in the axial direction than the maximum width dimension of the sheet paper S conveyed to the discharge portion 2. Further, as shown in FIG. 2, each flat surface portion 321 of the present embodiment is provided over the entire length of the exposed portion in the discharge portion 2 of the suction outer pipe 32. Each flat surface portion 321 has a plurality of suction holes 323 ... 323 opened so as not to contact the circumferential end edge of the flat surface portion 3211. These plurality of suction holes 323 ... 323 can communicate with the internal space 31S of the suction inner tube 31. Each suction hole 323 has a perfect circular shape in the radial direction, and is a through hole that penetrates in the radial direction in the suction outer tube 32. However, the shape of each suction hole 323 is not limited to this. Further, in the present embodiment, five suction holes 323 arranged in the axial direction are set as one set, and each set is arranged at a predetermined distance in the axial direction, but the suction holes 323 are arranged in the suction outer tube 32. Is not particularly limited. However, setting the distance between both ends of the plurality of suction holes 323 ... 323 arranged in the axial direction to be smaller than the maximum width dimension of the sheet paper S conveyed to the discharge unit 2 does not generate unused suction holes 323. Therefore it is desirable.

As described above, the sheet paper S released from the paper ejection gripper 21 and moving by inertia in the ejection unit 2 is sucked into the plurality of suction holes 323 ... 323 of the suction outer tube 32. It is sucked and held by the suction outer tube 32. As a result, the sheet paper S is decelerated to the peripheral speed of the rotating suction outer tube 32 (specifically, the tangential velocity of the suction outer tube 32). In the present embodiment, the suction outer tube 32 sucks the sheet paper S on the rear side (upstream side) in the transport direction from the substantially center in the transport direction (top and bottom direction of the sheet paper S) in the sheet paper S.

As shown in FIG. 5B, the suction hole 323 has an enlarged portion 3231 whose diameter is enlarged at the outside diameter position. The connection portion (opening edge portion, ridge line portion) of the suction hole 323 (specifically, the enlarged portion 3231) to the flat surface 3211 has a curved surface 3232, which is not clear in the drawing, and has a fine rounded shape. There is. As described above, since the portion in contact with the sheet paper S has no corners (not sharpened) and has a rounded shape, even if the suction outer tube 32 comes into contact with the sheet sheet S due to suction, the sheet is printed. The surface of the leaf paper S and the printed surface formed on the sheet paper S are not easily damaged.

Next, the second embodiment will be described. In addition, the following description mainly describes a form different from the first embodiment. In the second embodiment, as shown in FIGS. 6 to 8, the flat surface portion 321 has a groove shape along the axial direction, and the flat surface portion 3211 possessed by the flat surface portion 321 is formed at a deep position inside in the radial direction. Therefore, unlike the first embodiment, each flat surface 3211 does not directly abut on the surface of the sheet paper S, but the peripheral edge of each flat surface portion 321 abuts. However, even in such a case, since the contact state at the circumferential end edge of each flat surface portion 321 becomes flat, the action of "sucking the sheet paper S on the flat surface" is the same as in the first embodiment. Is played.

And in this second embodiment, since the flat surface portion 321 has a groove shape, the concave flat surface portion 321 can be uniformly negative pressure. Therefore, the sheet paper S can be sucked in a wider area than in the first embodiment in which only each suction hole 323 has a negative pressure. Further, depending on the size of the sheet paper S, even if there is a portion of the flat surface portion 321 that does not overlap with the sheet paper S, suction is performed from that portion to the portion of the flat surface portion 321 that overlaps with the sheet paper S. An air flow is generated. Since negative pressure is also generated by this airflow, in addition to the direct suction force by the suction hole 323, the suction force is applied between the portion of the flat surface portion 321 that overlaps the sheet paper S and the sheet sheet S. It is generated.

Even in this second embodiment, the suction of the sheet paper S can be effectively performed as compared with the conventional configuration in which the curved surface (suction outer tube) and the flat surface (sheet sheet) are in contact with each other. Therefore, by easily decelerating the sheet paper S, stable paper ejection can be performed in the ejection unit 2.

Although the vacuum suction wheel 3 according to the two embodiments of the present invention has been described above, the present invention is not limited to each of the above embodiments, and various changes can be made without departing from the gist of the present invention. It is possible.

For example, the space between the two

flat surface portions

321 and 321 may be different without providing the circumferential surface portion 322. For example, a flat surface having no suction hole 323 (a portion different from the flat surface portion 321 in the above embodiment) may be formed between the flat surfaces 3211 having the suction hole 323 (the flat surface portion 321 in the embodiment).

Further, for example, the suction outer pipe 32 is not configured as one straight pipe extending in a direction orthogonal to the transport direction of the sheet paper S, but is arranged in a row in a direction orthogonal to the transport direction of the sheet paper S. It may be configured as a plurality of straight pipes.

1 ... Sheet-fed printing machine, 2 ... Discharge unit, 3 ... Vacuum suction wheel, 4 ... Suction mechanism, 21 ... Paper ejection gripper, 21M ... Paper ejection gripper moving direction, 22 ... Paper ejection chain, 23 ... Front guide, 24 Back guide, 31 ... Suction inner tube, 31S ... Internal space, 32 ... Suction outer tube, 311 ... Long hole, 321 ... Flat surface, 322 ... Circumferential surface, 323 ... Suction hole, 324 ... Gear, 3211 ... Flat surface, 3221 ... Curved surface (circumferential surface), 3231 ... Enlarged part, 3232 ... Curved surface (suction hole), P ... Palette, S ... Sheet sheet, Sheet paper

Claims

The sheet-shaped sheet provided in the ejection section of the sheet-fed printing machine and conveyed to the ejection section is sucked on the outer peripheral surface while rotating along the conveying direction, thereby reducing the conveying speed of the sheet. In a vacuum suction wheel, a straight pipe fixed at the discharge portion so that the axial direction is orthogonal to the transport direction, and is located outside the diameter of the suction inner pipe capable of creating a negative pressure in the internal space and the suction inner pipe. It is a straight pipe and is provided with a suction outer pipe that rotates in the circumferential direction with respect to the suction inner pipe.
A plurality of flat surfaces are intermittently provided in the circumferential direction on the outer peripheral portion of the suction outer tube.
Each of the plurality of plane portions is a plane orthogonal to the radial direction, and has a plane formed in which the radial dimension is smaller than the portion sandwiched by the plane portions in the circumferential direction.
Each of the plurality of flat surface portions is a plurality of suction holes opened so as not to be in contact with the circumferential end edge of the plane, and a plurality of suction holes that can communicate with the internal space of the suction inner tube. A vacuum suction wheel characterized by having.
The vacuum suction wheel according to claim 1, wherein the plane is continuously formed in the axial direction.
The flat surface portion and the circumferential surface portion are alternately provided on the outer peripheral portion of the suction outer tube in the circumferential direction.
The vacuum suction wheel according to claim 1 or 2, wherein the circumferential surface portion has a curved surface having a constant radial dimension.