WO2006120900A1

WO2006120900A1 - Sheet feeder

Info

Publication number: WO2006120900A1
Application number: PCT/JP2006/308703
Authority: WO
Inventors: Hirohisa Inoue; Yukihiro Noto
Original assignee: Hamada Printing Press Co., Ltd.
Priority date: 2005-05-09
Filing date: 2006-04-26
Publication date: 2006-11-16
Also published as: JP2006312539A; US20090072476A1

Abstract

A sheet feeder capable of accurately feeding a sheet even when a rule is present near the front end or rear end of the sheet. A plurality of roller units (3) formed of pairs of upper and lower feed rollers (1) and (2) are installed at intervals in a direction perpendicular to a sheet feeding direction. The adjacent roller units (3) and (3) are displaceably disposed relative to each other in the sheet feeding direction. The sheet feeder comprises an upper side roller drive means simultaneously rotating the upper feed rollers (1) and a lower side roller drive means simultaneously rotating the lower side feed rollers (2). The sheet (5) is held between the rotating upper side feed rollers (1) and the lower side feed rollers (2) and fed by these rollers.

Description

Specification

Sheet feeder

Technical field

[0001] The present invention relates to a sheet feeding apparatus for feeding sheets such as corrugated cardboard sheets.

Background art

[0002] In general, a printing machine for printing on a corrugated cardboard sheet is fed a corrugated sheet by a sheet feeding device comprising a pair of upper and lower feed rollers to a plate cylinder. However, if the corrugated sheet has a ridge line in the direction perpendicular to the sheet feeding direction, the feed roller pinches the stepped ball sheet at the position of the ridge line-the pressure on the corrugated sheet becomes low, and the feeding of the corrugated sheet becomes unstable. , Causes a gap in printing.

[0003] In order to prevent this printing deviation, as shown in FIG. 7 (a), a pair of upper and lower feed rollers are arranged in the sheet feed direction, and the stages fed from the delivery device 30 by the feed rollers. There is known a sheet feeding apparatus which feeds a sheet of paper 31 between a printing cylinder 32 and an impression cylinder 33 of a printing press. In this sheet feeding apparatus, even if the surface of the corrugated cardboard sheet 31 is separated from the feed rollers 34 and 35 in one row at the position of the ridge line 31a, the feed rollers 36 and 37 in the other row sandwich the corrugated cardboard sheet 31. Since it can be fed, the corrugated cardboard sheet 31 can be sent accurately.

However, as shown in FIG. 7 (b), when the ridgeline 31 a is near the front end of the corrugated cardboard sheet 31, the corrugated paper may not be inserted before the downstream feed rollers 36, 37 sandwich the front end of the corrugated cardboard sheet 31. Since the ridge line 31a of the belt 31 faces the upstream feed rollers 34, 35, the feeding of the corrugated cardboard sheet 31 becomes unstable. Also, even if there is a ridgeline near the rear end of the corrugated cardboard sheet 31, the ridgeline 31a of the corrugated cardboard sheet 31 is the downstream feed roller 36 after the upstream feed rollers 34 and 35 feed the rear end of the corrugated cardboard sheet. As opposed to 37, the feeding of the cardboard sheet 31 becomes unstable.

This problem can be solved by reducing the diameter of the feed roller and reducing the distance between the upstream feed roller and the downstream feed roller. However, if the roller diameter becomes too thin, the feed will be reduced. Make the roller diameter smaller than necessary because the roller bends and tends to resonate. I can not do it.

Therefore, in this conventional sheet feeding apparatus, as shown in FIGS. 7 (a) and 7 (b), the upstream feed rollers 34 and 35 are inserted between the downstream feed rollers 36 and 37. Thus, the force that reduces the distance between the upstream feed rollers 34, 35 and the downstream feed rollers 36, 37. The distance between the upstream feed rollers 34, 35 and the downstream feed rollers 36, The force vj can not be removed unless 37 and 37 interfere with each other. Therefore, even with this sheet feeding apparatus, the corrugated sheet 31 can not be fed accurately if there is a ridge line 31a near the front end or near the rear end of the corrugated sheet 31.

Disclosure of the invention

Problem that invention tries to solve

An object of the present invention is to accurately feed a sheet even when there is a ridgeline near the front end or the rear end of the sheet.

Means to solve the problem

In order to solve the above problems, a plurality of roller units consisting of a pair of upper and lower feed rollers are provided at intervals in a direction perpendicular to the sheet feeding direction, and the adjacent roller units are mutually arranged in the sheet feeding direction. An upper roller drive means for shifting the upper feed rollers of the plurality of roller units simultaneously and a lower roller drive means for simultaneously rotating the lower feed rollers of the plurality of roller units are provided. A configuration is adopted in which the sheet is sandwiched and fed by the rotating upper feed roller and the lower feed roller.

In the corrugated board feeder of this configuration, since the roller units adjacent in the direction perpendicular to the sheet feeding direction are separated from each other, the deviation amount of the sheet feeding direction of the adjacent roller units can be freely set. Can. Therefore, even when there is a ridgeline near the front end or the rear end of the sheet, the shift amount in the sheet feeding direction of the adjacent roller units should be set smaller than the distance to the front edge or the rear end force ridgeline of the sheet. It is possible to feed the sheet with high accuracy.

The upper roller driving means includes an upper rotation driving shaft provided in parallel with the upper feed roller, and torque transmitting means for transmitting the rotation of the upper rotation driving shaft to the upper feed rollers. It is preferable then. This way, each upper feed Since the rollers are driven by the common upper rotational drive shaft, the rotational speeds of the respective upper feed rollers match, and the sheet can be fed more accurately.

Further, the plurality of roller units are arranged in a staggered manner alternately shifted in the sheet feeding direction, and located above the middle between the upper feed roller located on the upstream side and the upper feed roller located on the downstream side. Since the feed roller and the upper rotation drive shaft are arranged up and down in the above arrangement of the upper rotation drive shaft, the installation space in the sheet feed direction can be reduced, and the assembly into a printing unit such as flexo folder dalar is easy. It is.

Similarly, the lower roller drive means includes a lower rotation drive shaft provided parallel to the lower feed roller, and a torque transmission for transmitting the rotation of the lower rotation drive shaft to the lower side. It is preferable that the plurality of roller units are arranged in a staggered manner alternately shifted in the sheet feeding direction, and the lower feed roller located on the upstream side and the lower side located on the downstream side. It is more preferable to arrange the lower rotation drive shaft below the middle of the feed roller.

Effect of the invention

The sheet feeding apparatus according to the present invention can freely set the sheet feeding direction shift amount of the roller units adjacent in the direction perpendicular to the sheet feeding direction. Even when there are ridges on the sheet, the sheet can be sent accurately. Brief description of the drawings

[FIG. 1] A side view of a roller unit of a sheet feeding apparatus according to the present invention

[FIG. 2] A perspective view of the roller unit of FIG.

[Fig. 3] The feed roller force on the upstream side of Fig. 1 A side view showing the corrugated sheet is separated at the position of the ridge line

[FIG. 4] A sectional view of the roller unit of FIG. 1 as viewed from the front

[FIG. 5] (a) is a cross-sectional view taken along the line A-A in FIG. 4, (b) is a cross-sectional view taken along the line B-B in FIG. Figure

[Fig. 7] Side view of the conventional sheet feeding apparatus

Explanation of sign

[0015] 1 Upper feed roller 2 Lower feed roller

3 Roll-up

5 corrugated sheet

9, 11, 15, 17 gears

10 Top rotation drive shaft

16 lower rotation drive shaft

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows an embodiment of a sheet feeding apparatus according to the present invention. This apparatus has a plurality of roller units 3 consisting of a pair of upper and lower feed rollers 1 and 2. The roller unit 3 sandwiches the cardboard sheet 5 delivered from the stage ball sheet delivery device 4 and feeds it between the plate cylinder 6 and the impression cylinder 7 of the printing press.

Each of the roller units 3 is disposed at an interval in a direction perpendicular to the sheet feeding direction as shown in FIG. 2, and the adjacent roller units 3 and 3 are mutually offset in the sheet feeding direction. It is arranged as. The amount of deviation in the sheet feeding direction is set to be smaller than that of the corrugated sheet having the shortest distance to the sheet front end or sheet rear end force ridge line 5a. Therefore, as shown in FIG. 3, when the ridgeline 5a faces the upstream feed rollers 1 and 2 as in FIG. 3, the corrugated sheet 5 is pinched by the downstream feed rollers 1 and 2, and When the ridgeline 5a faces the downstream side feed rollers 1 and 2, the upstream side feed rollers 1 and 2 pinch the sheet and feed the sheet stably.

The upper feed roller 1 is rotatably supported by the upper stay 8 as shown in FIG. 4, and a gear 9 is provided at one end thereof. An upper rotation drive shaft 10 parallel to the upper feed roller 1 is rotatably provided in the upper stay 8, and the upper rotation drive shaft 10 is engaged with the gear 9 of the upper feed roller 1. A gear 11 is provided. The upper rotation drive shaft 10 is driven to rotate by a driving device (not shown), and when the upper rotation drive shaft 10 rotates, the rotational movement of the upper rotation drive shaft 10 is performed by the upper feed roller via the gears 11 and 9. Transfer to 1 and rotate the feed roller 1 simultaneously. Therefore, the rotational speeds of the upper feed rollers 1 match, and the corrugated cardboard sheet 5 is fed more accurately.

Also, since the upper feed rollers 1 are individually supported by the upper stay 8, It is hard to feel. Therefore, the feeding accuracy is good also when the upper feed roller 1 feeds the corrugated cardboard sheet 5 at high speed, which causes resonance.

The upper stay 8 is attached to the frame 12 so as to be vertically movable. In this frame 12, as shown in FIG. 5, an adjustment cam 13 in contact with the upper stay 8 is rotatably provided. When the adjustment cam 13 is rotated by a driving device (not shown), the adjustment is performed. The cam 13 pushes the upper stay 8 to move it vertically. At this time, since the upper feed roller 1 moves with the upper stay 8, the size of the gap between the upper feed roller 1 and the lower feed roller 2 changes. Thus, the size of the gap between the upper feed roller 1 and the lower feed roller 2 can be changed, and the size of the gap is adjusted according to the thickness of the corrugated sheet 5 and the state of the warp. As a result, the corrugated cardboard sheet 5 can be fed more accurately.

The upper rotation drive shaft 10 is supported by the upper stay 8, and when the adjustment cam 13 is rotated to move the upper feed roller 1 in the vertical direction, the upper rotation drive shaft 10 moves Then, keep the gear 11 and gear 9 together!

The lower feed roller 2 is also rotatably supported by the lower stay 14 as shown in FIG. 4, and a gear 15 is provided at one end. The gear 15 is in mesh with a gear 17 of the lower rotation drive shaft 16 disposed parallel to the lower feed roller 2. Therefore, when the lower rotation drive shaft 16 is rotated by a driving device (not shown), the lower feed rollers 2 are simultaneously rotated. The lower stay 14 is fixed to the frame 12 at both ends.

As described above, since the lower feed rollers 2 are also individually supported by the lower stay 14, they do not easily bend. Therefore, the feeding accuracy is good even when the lower sheet feeding roller 2 feeds the corrugated cardboard sheet 5 at a high speed so as to cause resonance.

The roller units 3 are arranged in a staggered manner alternately in the sheet feeding direction as shown in FIG. 6, and as shown in FIG. 5, the feed roller 1 located on the upstream side and the feed roller 1 located on the downstream side. Preferably, the upper rotary drive shaft 10 is disposed in the upper middle of the above. In this case, since the feed roller 1 and the upper rotation drive shaft 10 are vertically aligned, the installation space of the sheet feeding device in the sheet feeding direction is reduced, and incorporation into a printing unit such as flexo folder daller is acceptable. It becomes easy. In addition, the center-to-center distance between the upper feed roller 1 and the upper rotation drive shaft 10 is Because of the unification, the gears connecting the upper rotation drive shaft 10 and the upper feed rollers 1 can be made common to improve both maintainability and economy.

Similarly, it is preferable that the lower rotation drive shaft 16 be disposed below the middle of adjacent feed rollers 2, 2 of the staggered roller units 3. As shown in FIG.

The roller units 3 have forces arranged in a zigzag form in the figure. For example, in a V-shaped arrangement in which the V-shaped arrangement is further deviated to the downstream side as it is farther from the center roller seat, a direction perpendicular to the sheet feeding direction. If the adjacent roller units are offset from each other in the sheet feeding direction, then.

The torque transmission means for transmitting the rotation of the upper rotation drive shaft 10 to the upper feed roller 1 is not limited to a gear. For example, a chain, timing belt, V-belt, etc. may be used. The same applies to the torque transmission means for transmitting the rotation of the lower rotation drive shaft 16 to the lower feed roller 2.

In the above-described embodiment, the upper feed roller 1 and the upper rotation drive shaft 10 are connected by a gear to rotate the upper feed rollers 1 simultaneously. For example, driving of a motor or the like for each feed roller A device may be provided and simultaneously driven to rotate the drive simultaneously. In this way, the feed roller 1 can be selectively driven according to the size of the corrugated cardboard sheet 5 to minimize the wear of parts. The same is true for driving the lower feed roller 2!

In the above-described embodiment, the corrugated sheet is described as the sheet to be conveyed.

1S Other sheets may be conveyed, for example, a resin sheet having grooves formed on the surface.

Claims

The scope of the claims

[1] A plurality of roller units having a pair of upper and lower feed roller forces are provided at intervals in a direction perpendicular to the sheet feeding direction, and adjacent roller units are mutually offset in the sheet feeding direction and arranged. And an upper roller driving means for simultaneously rotating the upper feed rollers, and a lower roller driving means for simultaneously rotating the lower feed rollers of the plurality of roller units. A sheet feeding device for sandwiching and feeding a sheet by the feed roller on the side.

[2] The upper roller drive means comprises an upper rotation drive shaft provided parallel to the upper feed roller, and torque transmission means for transmitting the rotation of the upper rotation drive shaft to the upper feed rollers. The sheet feeding device according to claim 1.

[3] The plurality of roller units are arranged in a staggered manner alternately shifted in the sheet feeding direction, and the upper side of the upper feed roller located on the upstream side and the upper feed roller located on the downstream side are above the middle The sheet feeding apparatus according to claim 2, wherein an upper rotation drive shaft is disposed.

[4] The lower roller drive means includes a lower rotational drive shaft provided parallel to the lower feed roller, and a torque transfer means for transmitting the rotation of the lower rotational drive shaft to the respective lower feed rollers. The sheet feeding device according to any one of claims 1 to 3, comprising:

[5] The plurality of roller units are arranged in a staggered manner alternately shifted in the sheet feeding direction, and the lower side between the lower side feed roller located on the upstream side and the lower side feed roller located on the downstream side The sheet feeding apparatus according to claim 4, wherein the lower rotation drive shaft is disposed on the rear side.