JP2016032853A - Dislocated poor punching inspection device and punching device - Google Patents

Abstract

[PROBLEMS] In the process of punching a stack of stacked sheets, it is not affected by dropping of scraps generated after punching and dust such as paper dust, regardless of design constraints and sheet thickness, Even for a thin sheet bundle having a thickness of 100 μm or less, it is possible to detect a slippage defect due to a sheet jumping out in-line.
An inspection device for detecting a defect in a slippage due to a sheet jumping out during conveyance of a sheet bundle (4) stacked by a punching device,
Measuring means (7) for measuring the end face position of the conveyed sheet bundle (4);
Data processing means (9) for calculating and processing the obtained measurement data;
An air blow mechanism (11) for protecting the measuring means (7);
It has a drop prevention mechanism (10) for the scraps (5) after punching.
[Selection] Figure 1

Description

  The present invention is a punching device that is installed in a punching device that punches a plurality of stacked sheets into an arbitrary shape, and inspects a slipping failure due to sheet ejection during conveyance of a sheet bundle in-line, and the punching device therefor About.

  In the process of manufacturing a lid material such as a label or a cup container attached to a beer bottle, there is an operation of punching a sheet bundle in which hundreds to thousands of rectangular sheets are stacked into an arbitrary shape with a punching device.

  As described above, when a plurality of sheet bundles are punched, a “missing error” occurs in which the positional relationship between the punching position and the pattern printed on the sheet is shifted. As a cause of the unsatisfactory displacement, a plurality of sheets jump out or rotate from one sheet in the sheet bundle during the punching operation.

Regarding inspection for defective punching, an inspection method for observing the positional relationship between the pattern and the punching position after punching, or an inspection method for observing the shade difference in color appearing on the end face by performing printing at the punching position (see, for example, Patent Document 1) ) Is used.
In the current manufacturing process, the above inspection is carried out by human visual inspection, which causes a reduction in production efficiency and an increase in work load.

The above-described inspection method for observing the positional relationship between the pattern and the punching position requires turning a plurality of stacked sheets so that the pattern can be seen, and cannot be inspected during punching.
In addition, the inspection method for observing the difference in shade of the color that appears on the end face by printing at the punching position detects a small number of punching defects such as one when the thickness of the sheet to be inspected is as thin as 100 μm or less. Difficult to do. In addition, there are restrictions on the design, and it is not possible to inspect when the end portion cannot be printed.

JP-A-10-329454

  The present invention has been made in view of the above-described background art, and in the process of punching a stack of stacked sheets, the design is not affected by dropping of scraps generated after punching and dust such as paper dust. It is an object of the present invention to make it possible to detect a slippage defect due to a sheet jumping out during inline conveyance even for a thin sheet bundle having a thickness of 100 μm or less regardless of restrictions and sheet thickness.

In order to solve the above-described problem in the present invention, first, in the invention of claim 1, an inspection apparatus that detects a slippage defect due to sheet jumping during conveyance of a plurality of stacked sheet bundles by a punching apparatus,
Measuring means for measuring the end surface position of the conveyed sheet bundle;
Data processing means for computing the obtained measurement data;
An air blow mechanism for protecting the measuring means;
This is a defective displacement inspection device characterized by having a mechanism for preventing the fall of scraps after punching.

  In the invention of claim 2, the measuring means is a laser displacement meter.

  According to a third aspect of the present invention, the sheet bundle material is a single layer or multi-layer structure having a paper layer.

  According to a fourth aspect of the present invention, the air blow mechanism includes a box portion that protects the measuring means by positively supplying it with air supply or a state in which it is intentionally pushed out by air flow, and an air outlet that blows air toward the measurement point. It is what is set as the removal defect inspection apparatus in any one of Claims 1-3 characterized by the above-mentioned.

  Further, in the invention of claim 5, the air blow mechanism prevents intrusion of dust such as paper dust into the optical path portion and the measurement point of the laser displacement meter. It is what.

  According to a sixth aspect of the present invention, the fall prevention mechanism has a slope and a horizontal portion for guiding the scrap, and prevents the fall of the scrap by pushing up and transporting the scrap generated by pulling it up later. It is a cover which carries out, It is set as the disconnection defect inspection apparatus in any one of Claims 1-5 characterized by the above-mentioned.

  According to a seventh aspect of the present invention, the above-mentioned cover is used as the defective displacement inspection device according to the sixth aspect of the present invention, wherein the above-mentioned cover pushes up scraps along the gradient of the cover and prevents them from dropping.

  According to an eighth aspect of the present invention, there is provided a punching device comprising the defect inspection device according to any one of the first to seventh aspects.

  The present invention is not affected by design restrictions or sheet thickness without being affected by falling dust and paper dust generated after punching in the process of punching a stack of stacked sheets. In addition, even for a thin sheet bundle having a thickness of 100 μm or less, there is an effect that it is possible to detect a slippage defect due to a sheet jumping out in-line.

The schematic diagram of the punching device in which the defective inspection apparatus of this invention was installed. The schematic diagram of the scrap fall prevention cover which the disconnection defect inspection apparatus of this invention has. The schematic diagram of the laser displacement meter and the air blow mechanism which the disconnection defect inspection apparatus of this invention has. The schematic diagram which showed the reference line computed from the measured value and measured value of Example 1 of this invention.

  Hereinafter, an embodiment of the present invention will be described.

As shown in FIG. 1, the punching device of the present invention includes a laser displacement meter 7 that measures the position of the end face of the sheet bundle 4, in addition to the punching die 1, the push plate 2, and the guide plate 3, which are the basic mechanisms of the punching device. The present invention has a trigger sensor 8 to detect, an inspection determination device 9 for performing inspection determination, a fall prevention cover 10 for scraps 5 generated by punching, and an air blow mechanism 11 for protecting the laser displacement meter 7 from dust such as paper dust. A defect inspection device is installed. This punching device punches a plurality of sheet bundles 4 in the label manufacturing process, and this inspection device inspects for a slippage defect caused by a plurality of sheets popping out from one sheet bundle during the punching operation.

  In FIG. 1, the laser displacement meters 7 are represented by installation in only two directions, but four laser displacement meters 7 are installed in the direction of the entire end surface in order to make the amount of sheet displacement in an arbitrary direction an inspection target. The laser displacement meter 7 is a mechanism that can slide in the horizontal direction and the vertical direction with respect to the sheet bundle 4 to be inspected.

  The sheet bundle 4 to be inspected is conveyed upward by the push plate 2 while being guided in four directions by the guide plate 3 of the punching device, and is pushed into the punching die 1 of the punching device and punched. By punching, a product-shaped sheet bundle 6 is formed and scraps 5 are generated.

  As shown in FIG. 3, the laser displacement meter 7 includes a light projecting unit 12 and a light receiving unit 13. Inspection immediately before punching when light output from the light projecting portion 12 of the laser displacement meter 7 is reflected by the sheet bundle 4 to be inspected immediately before punching by the punching die 1 and enters the light receiving portion 13 of the laser displacement meter 7 An end face position measurement value of the target sheet bundle 4 is obtained and input to the inspection determination device 9.

  The trigger sensor 8 is installed in the vicinity of the push plate 2 of the punching device, and the push plate 2 moves to a predetermined position and detects the start of the punching operation. A detection signal from the trigger sensor 8 is input to the inspection device 9.

The inspection determination device 9 performs inspection by data processing of the following [a] to [c] using the detection signal from the trigger sensor 8 and the end face position measurement value from the laser displacement meter 7.
[A] Measurement and recording of end face position of sheet bundle 4 when punched by laser displacement meter 7.
[B] A moving average is calculated from the recorded measurement value in the inspection determination device 9 to calculate a reference line of each end face.
[C] The measurement value of each end face recorded above is compared with the calculated value of the reference line to determine pass / fail.

  As shown in FIG. 2, the scrap fall prevention cover 10 includes a guide portion 10 b and a horizontal portion 10 a having a gentler slope than that of the die 1. As shown in FIG. 1, the scrap 5 generated by punching is pushed up and removed without dropping to the horizontal portion 10 a by being pushed through the guide portion 10 b and pushed by the scrap 5 generated later.

  As shown in FIG. 3, the air blow mechanism 11 blows air toward the measurement point of the laser displacement meter 7 and the supply port 11 a for supplying air, the cylindrical protective box portion 11 b that protects the optical path portion of the laser displacement meter 7. The blower outlet 11c is provided. By protecting the protective box 11b from a positive pressure state or a state where it is intentionally pushed out with an air volume, the influence of dust such as paper dust on the optical path of the laser displacement meter 7 represented by the arrow is protected, and from the blowout port 11c. Air blowing protects dust from entering the measurement point.

  A sheet bundle 4 in which 1000 sheets of aluminum vapor-deposited paper sheets having a thickness of 60 μm and a width of 100 mm square were stacked was examined. The inspection target of 1000 sheets is conveyed in 1 second by the push plate 2 of the punching device, and punched at a time.

Trigger sensor 8 uses Keyence proximity sensor EV-108, and laser displacement meter 7
LK-H020 made by Keyence having a spot diameter of 25 μm was used.
Further, as shown in FIG. 2, a cover 10 having a guide portion 10 b having a gradient of 50 ° with respect to the gradient 65 ° of the die 1 was installed. The cover 10 was subjected to black processing (black alumite processing) in order to reduce the reflectance in consideration of the possibility of measurement failure due to interference of the laser displacement meter 7.
An acrylic plate having a thickness of 1 mm was formed on the box portion 11b of the air blow mechanism 11 by bonding, and air was supplied.

  And the sheet | seat which protruded 0.5 mm from the sheet | seat bundle 4 of the said test object was mixed intentionally, and the punching was implemented.

  The sampling period of the laser displacement meter 7 was measured at 5 kHz, and the reference line was calculated using the moving average interval 200 plot. FIG. 4 shows measured values and a reference line calculated from the measured values. In FIG. 4, a place where a measured value enters a region that is shifted by 0.5 mm or more from the reference line means a defective displacement due to sheet pop-out.

  As shown in FIG. 4, a laser displacement meter (LK-H020, manufactured by Keyence) 7 having a spot diameter of 25 μm is used to measure the variation of the sheet end face position during the punching operation, and the variation of the voltage value obtained from the laser displacement meter 7 is measured. By doing so, it was possible to detect a displacement of 0.5 mm.

  In a visual inspection by a normal inspection person, since inspection is performed while turning a sheet bundle after punching, it takes 30 seconds to detect the misalignment. However, the defect defect inspection apparatus of the present invention can detect it during the punching operation. Therefore, inspection work after punching is not required, which is effective for improving production efficiency and reducing work load.

DESCRIPTION OF SYMBOLS 1 ... Die | punch of a punching device 2 ... Push plate of a punching device 3 ... Guide plate 4 of a punching device ... Sheet bundle 5 ... Scrap 6 generated by punching ... Sheet bundle 7 of product shape formed by punching ... Laser displacement meter 8 ... Trigger sensor 9 ... Inspection determination device 10 ... Drop fall prevention cover 10a ... Horizontal portion 10b of the fall fall prevention cover 10 ... Gradient guide part 11 of the fall fall prevention cover 10 ... Air blow mechanism 11a ... Air blow mechanism 11 Air supply port 11b ... Protective box portion 11c of air blow mechanism 11 ... Air blowout port 12 of air blow mechanism 11 ... Light projecting portion 13 ... Light receiving portion

Claims (8)

An inspection device for detecting a defective displacement due to sheet ejection during conveyance of a bundle of sheets stacked by a punching device,
Measuring means for measuring the end surface position of the conveyed sheet bundle;
Data processing means for computing the obtained measurement data;
An air blow mechanism for protecting the measuring means;
An apparatus for inspecting an unsatisfactory displacement, comprising a mechanism for preventing dropping of the scraps after punching.   The apparatus according to claim 1, wherein the measuring means is a laser displacement meter.   3. The apparatus for inspecting a slippage defect according to claim 1, wherein a material of the sheet bundle is a single layer or a multilayer structure having a paper layer.   The air blow mechanism includes a box portion that protects the measurement means by positively supplying the air by supplying air or a state in which the measurement means is intentionally pushed by an air volume, and an air outlet that blows air toward a measurement point. The disconnection defect inspection apparatus according to any one of 1 to 3.   The defect inspection apparatus according to claim 2, wherein the air blow mechanism prevents dust such as paper dust from entering an optical path portion and a measurement point of a laser displacement meter.   The fall prevention mechanism is a cover that has a slope and a horizontal portion for guiding the scraps, and is a cover that prevents the scraps from falling by being pushed up by the scraps generated by pulling up later and transported. An apparatus for inspecting a slippage defect according to any one of claims 1 to 5.   7. The apparatus according to claim 6, wherein the cover pushes up scraps along the gradient of the cover and prevents the scraps from dropping.   A punching device comprising the defect inspection device according to any one of claims 1 to 7.