JP3927755B2 - Sheet conveyance line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a line for conveying a sheet, and more particularly to a sheet conveyance line provided with defect detection means for monitoring a sheet being conveyed and detecting defects such as corner breakage and tearing.
[0002]
[Prior art]
In the signature conveyance line of the printing machine, the sheet carry-out port differs depending on the folding shape, and the folded sheet enters the common conveyance line through several paths and reaches the stacker. When it is necessary to detect a folding failure, defect detection means is usually installed near the final folding.
[0003]
[Problems to be solved by the invention]
However, in a folding machine capable of a large number of folding shapes, it is necessary to install defect detection means for each sheet discharge port, so that the number of defect detection means to be installed increases, resulting in an increase in cost. Therefore, it is necessary to be able to be monitored by a single defect detection means even if the folding shapes are various, and this is a problem to be solved.
[0004]
[Means for Solving the Problems]
The first invention for achieving the above object, includes a sheet separating means for separating a sheet being transported by overlapping scales one by one in the middle line, separated one by one by the sheet separating means It is a sheet conveyance line provided with defect detection means for monitoring a conveyed sheet and detecting a defect.
[0005]
According to a second aspect of the present invention, in the sheet conveying line of the first aspect, the sheet separating unit separates the sheet by increasing the conveying speed from the upstream side .
[0006]
3rd invention is a sheet conveyance line which is a printed sheet by which the sheet | seat was folded by the folding machine in the sheet conveyance line of the said invention.
[0007]
According to a fourth aspect of the present invention, in the sheet conveyance line of the above invention, a line switching means for switching and connecting to any one of the plurality of sheet discharge lines is provided at the starting end.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The implementation mode of the present invention will be described with reference to FIGS. Sheet over preparative conveying line shown in FIGS. 1-4, the sheet unloading opening 1A of the folding machine (not shown), 1B sheet dispensing line 2A installed in each and 2B one end portion, for switching and connecting the starting end Line switching means 3 that can be used, a first sheet conveying means 4 that is installed so that a starting end faces the terminal portion of the line switching means 3 and a sheet can be delivered, and the first sheet conveying means 4 The sheet separating means 5 installed so as to be able to deliver the sheet with the start end facing the end portion, and the second sheet installed so as to be able to deliver the sheet with the start end facing the end portion of the sheet separating means 5 Consists of a conveying means 8 and a defect detecting means 9 installed in the part of the sheet separating means 5,
[0009]
A stacker in which a printed folded sheet 100 that has been folded by a folding machine (not shown) and is conveyed and discharged in a scaled state from either the sheet carry-out port 1A or 1B is set facing the end of the second sheet conveying means 8 10, a defect of the printed folded sheet 100 is detected in the middle of conveyance and storage.
[0010]
The line switching means 3 is configured such that the start end side is rotated by a hydraulic mechanism or the like with the end side as a fulcrum, and the start end faces the end of any of the sheet discharge lines 2A and 2B so that the sheet can be delivered. .
[0011]
The sheet separating means 5 comprises an upper feeding means 6 for lifting the printed folded sheet 100 upward and a lower feeding means 7 for lowering the printed folded sheet 100 lifted by the upper feeding means 6. In this case, the lower feeding means Reference numeral 7 denotes a resin plate 7A having a friction coefficient reduced by smoothing the surface so that the printed folded sheet 100 is easy to slide, for example, simply tilted as shown in FIG. The resin plate 7A is made of a transparent or translucent (diffusion plate). The resin plate 7A may be replaced with a tempered glass plate.
[0012]
The lower feeding means 7 is installed at a steeper slope than the upper feeding means 6 so that the speed when it naturally falls on the resin plate 7A is faster than when the printed folded sheet 100 is fed upward. It is configured.
[0013]
Therefore, the printed folded sheet 100 that is stacked in a scaled state and fed upward by the upper feeding means 6 is one when it slides down on the resin plate 7A due to the difference in conveyance speed between the upper feeding and the lower feeding. It is separated into One not.
[0014]
The sheet discharge lines 2A and 2B, the line switching unit 3, the first sheet conveying unit 4, the sheet separating unit 5, the upper conveying unit 6 and the second sheet conveying unit 8 are respectively connected to the printed folded sheet 100 from the starting end side. A transport mechanism known per se, for example, comprising a belt conveyor for transporting to the end side is provided.
[0015]
The defect detection means 9 shown in FIG. 2 is an edge monitoring apparatus proposed in Japanese Patent Application No. Hei 10-142968. The edge of the printed folded sheet 100 sliding down on the resin plate 7A is captured as a shadow picture. It is for monitoring whether or not a defect caused by folding such as the twist shown in FIG. 4A or the vertical displacement shown in FIG. 4B has occurred, and the edge of the printed folded sheet 100 is used as a shadow picture. In order to capture, two light sources 9A1 and 9A2 are arranged in parallel on the lower side of the resin plate 7A.
[0016]
When a transparent plate is used as the resin plate 7A, the light sources 9A1 and 9A2 having a diffusion plate on the surface are used. When the light sources 9A1 and 9A2 without a diffusion plate are used on the surface, the resin plate A diffuser plate is used for 7A.
[0017]
The defect detection means 9 shown in FIG. 3 is a sheet monitoring apparatus proposed in Japanese Patent Application No. 11-219025 or an apparatus for detecting a sheet defect by a conventionally known image analysis method using a camera. Observing the end face of the folded sheet 100, the printed folded sheet 100 has defects due to folding such as the corner bend 100A shown in FIG. 4C and the break 100B shown in FIG. In this case, the defect detection means 9 also monitors the light source (not shown) that illuminates the end face of the printed folded sheet 100 and its vicinity, and the lightness of the end face that is illuminated by this light source and its vicinity. Consists of cameras that do not. By providing such a defect detection means 9, it is possible to detect folds and tears of the inner page.
[0018]
The sheet conveying line of the present invention may be one in which only one of the defect detection means 9 shown in FIG. 2 or the defect detection means 9 shown in FIG. 3 is installed, or both are installed. It may be what you did.
[0019]
In addition, the sheet conveyance line of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit described in the claims.
[0020]
For example, a guide unit for the printed folded sheet 100 is provided on the starting end side, that is, the upper side of the lower feeding unit 7 so that the printed folded sheet 100 fed by the upper feeding unit 6 is always in the same posture. The resin plate 7A is slid down.
[0021]
The sheet separating means 5, the apparatus having to separate the One not a single print folded sheet 100 by a conveying speed difference between the Ueoku means 6 and the lower feed unit 7 as described above, the upper feed means 6 transport speed may be the same as the conveying speed of the first sheet conveying means 4, slow and may be faster, but separated into one not a single smooth sheet 100 folded printed in the lower feed unit 7 In order to do this, it is preferable that the conveying speed of the upper feeding means 6 is made faster than the first sheet conveying means 4 and the upper feeding means 6 has already made some variation.
[0022]
On the other hand, when the length of the line is limited, it is possible to shorten the length of the line by lowering the conveying speed of the upper feeding unit 6 than the first sheet conveying unit 4. In this case, it is preferable to provide an auxiliary means for separating the sheet 100 folded printed from top feed means 6 when moving to the lower feed unit 7 to the One not a single smoothly.
[0023]
Moreover, the defect detection means 9 may monitor the printing status of the surface of the printed folded sheet 100 and defects such as folds and tears appearing on the surface. In this case, the two light sources 9A1 and 9A2 shown in FIG. 2 are not provided, and the defect detection means 9 itself is used to illuminate the surface of the printed folded sheet 100 and the surface of the printed folded sheet 100 illuminated by the light source. Consists of a camera to observe.
[0024]
Further, the monitoring of the printed folded sheet 100 by the defect detecting means 9 may be performed at all times or only when the printed folded sheet 100 passes through the place monitored by the defect detecting means 9 by providing a timing sensor or the like. You may do it.
[0025]
Further, the printed folded sheet 100 may be folded by a parallel folding machine, a delta folding machine, a chopper folding machine, a former folding machine, or the like.
[0026]
【The invention's effect】
According to the present invention, in a folding machine capable of various folding processes, even if the sheet carry-out port is different due to the change in the folding shape, the sheet is simply installed by setting one set of defect detection means on the downstream common conveyance line. Since it is possible to detect shape defects such as vertical misalignment, twisting, corner bending, and tearing, and printing defects, it is possible to contribute to a reduction in equipment costs.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of the present invention .
2 is an explanatory diagram showing an example of a defect detection device for use in the implementation form.
3 is an explanatory view showing another example of the defect detection means used in the implementation form.
4A and 4B are explanatory diagrams of defects occurring in a sheet, in which FIG. 4A is an explanatory diagram of twisting, and FIG. (C) is explanatory drawing of a corner break, (D) is explanatory drawing of a tear.
[Explanation of symbols]
1A, 1B Sheet unloading port 2A, 2B Sheet delivery line 3 Line switching means 4 First sheet conveying means 5 Sheet separating means 6 Upper feeding means 7 Lower feeding means 7A Resin plate 8 Second sheet conveying means 9 Defect detecting means 9A1・ 9A2 Light source 10 Stacker 100 Printed folded sheet 100A Corner bend 100B Break

Claims (4)

A sheet separating means for separating the sheets conveyed in a scaled manner one by one is provided in the middle of the line, and the sheets separated and conveyed one by one by the sheet separating means are monitored to detect defects. A sheet conveyance line comprising defect detection means. 2. A sheet conveying line according to claim 1, wherein the sheet separating means separates the sheet by increasing the conveying speed from the upstream side . The sheet conveying line according to claim 1 or 2 , wherein the sheet is a printed sheet folded by a folding machine . The sheet conveying line according to any one of claims 1 to 3, wherein a line switching means for switching and connecting to any one of the plurality of sheet delivery lines is provided at a starting end portion .

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