JP3157815B2 - Detecting deviation of punching position of punched sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a displacement of a punched sheet in a sheet punching apparatus for punching a sheet such as a corrugated cardboard sheet into a predetermined shape.

[0002]

2. Description of the Related Art When punching a product portion having a predetermined shape from a printed cardboard sheet or the like, a sheet punching device as shown in FIG. 1 for explaining an embodiment of the present invention is used. Can be In this sheet punching device, a holding sheet piece corresponding to a corrugated cardboard sheet 3 sent out one by one by a kicker 2 from a sheet feeding unit 1 is transferred while being held by a gripper 5 as a holding tool attached to an endless chain 4. A punching section 7, a stripping section 8, and a product separation section 9 are provided in this order along the transfer path of the sheet transfer section 6. The cardboard sheets 3 stacked on the paper feed unit 1 are supplied from a printing machine (not shown),
The lower surface is printed.

In the punching section 7, as shown in FIG. 2, a predetermined product section 3b is formed on the sheet 3 held by the gripper 5 while leaving a connecting section 17 between the holding sheet piece 3a and the punching waste 3c. A punching cutting line 18 to be formed is inserted, and a folding ruled line 19 is also inserted. In the stripping section 8, the sheet 3 having the cutting line 18 inserted therein
From the sheet 3 from which the punched chips 3c have been removed, the product section 3b is separated on the product conveyor 23 from the sheet 3 from which the punched chips 3c have been removed. You. The holding sheet piece 3 a held by the gripper 5 to the end is discharged onto the scrap conveyor 34 on the downstream side of the product separating section 9.

The endless chain 4 is intermittently fed by a constant stroke, and the gripper 5 stops at each position of the punching section 7, stripping section 8 and product separating section 9, and the sheet 3 held by the gripper 5 The processing by each unit is performed.

In the above-described sheet punching apparatus, the holding position of the sheet held by the gripper of the sheet transfer unit may be shifted in the front-rear or left-right directions due to a shift in the sheet feeding position from the sheet feeding unit. When the sheet holding position is shifted in this way, the sheet punching position in the punching section is shifted, and the position of printing or the like on the punched sheet after punching is shifted, resulting in a defective product.
In addition, there is a possibility that a defective product in which the position of printing or the like is displaced may occur due to so-called reverse insertion in which a sheet that has been turned upside down or left and right is mixed in the sheet feeding unit.

[0006] In order to prevent defective products having the above-mentioned displacement from being supplied to the next step, the sheet punching device uses a predetermined portion of the holding sheet piece held by the gripper to preliminarily store each product type. The marking position given to this holding sheet piece,
The monitor is sequentially monitored by a monitor camera installed on the downstream side of the punching device to indirectly detect a deviation in the punching position of the punched sheet. Usually, this monitor camera is provided at a position where the gripper holding the holding sheet piece intermittently stops.

[0007]

In the above-described conventional method for detecting the deviation of the punched sheet from the punched sheet, the markings on the holding sheet pieces are sequentially monitored by a monitor camera and displayed on a display screen, which is provided on the display screen. The displacement of the pull-out position is detected by separate cursors in the horizontal and vertical directions. Therefore, the worker
It is difficult to determine the shift of the pull-out position by visually checking the horizontal and vertical cursors at distant positions. Furthermore, even if the monitor camera is provided at the stop position of the gripper, the stop time of the gripper is
Since the punching unit is instantaneous, the image of the monitored marking on the display screen changes during times other than this momentary stop time, and the operator accurately determines the displacement of the punching position. There is a problem that cannot be done.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punched sheet punching position detecting method which enables an operator to easily adjust a cursor and accurately determine a punching position shift.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to holding and transferring a portion corresponding to a sheet piece for holding a sheet supplied from a sheet feeding section by a holding member which moves intermittently. A sheet punching apparatus that punches out a sheet during this transfer, removes punching debris, and releases a portion corresponding to a holding sheet piece from a holding tool after separating a product portion; At the stop position of the portion corresponding to the sheet piece for holding, sequentially captures a marking of a shape having a corner portion previously applied to a predetermined portion of the portion corresponding to the holding sheet piece, and places it on a display screen provided with a two-dimensional cursor. by displaying, Te method odor for detecting a disconnect position shift of the punching sheet, based on the intermittent movement in synchronism with the signal generated before Symbol retainer said marking is displayed Sequentially holding a display screen, a function to update provided, the center of the two-dimensional cursor, with no bleeding deviation punching sheet was set at a position a corner of said marking is displayed on the display screen,
When the deviation of the corner of the marking sequentially displayed on the display screen from the center of the two-dimensional cursor is out of an allowable range, a method of determining rejection is adopted.

[0010] That is, the corner of the holding sheet piece is
An image of the marking in the shape of the shape at the stop position of the holder is held on the display screen until the marking of the next punched sheet intermittently transferred by the sheet transfer unit is imaged. Along with
By providing a two-dimensional cursor on this display screen, the center of the two-dimensional cursor is set to a reference position when there is no deviation, in the area of the two-dimensional cursor, the allowable deviation of the corner of the marking on the display screen, that is, By setting the permissible range of the punching sheet displacement, the worker can be displayed on the stationary display screen
The status of the deviation of the punching sheet can be grasped. This allows the operator to easily and accurately determine whether or not the pulling position is correct.

[0011]

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 and 2 show a sheet punching apparatus that employs the method for detecting a deviation of a punched sheet according to the present invention. This sheet punching apparatus is a transfer path of a sheet transfer unit 6 for transferring corrugated cardboard sheets 3 sent one by one from a sheet feed unit 1 by a kicker 2 while holding the cardboard sheets 3 by a gripper 5 attached to an endless chain 4. A punching section 7, a stripping section 8, a product separating section 9, a position shift detecting section 10, and a holding sheet piece releasing section 11 are provided in this order.

The corrugated cardboard sheets 3 stacked on the paper feed unit 1 are supplied from a printing machine (not shown), and have a printed pattern 12 on the lower surface thereof and a marking for detecting a displacement of a punching position described later. A bar code 13 having a corner portion as a print is printed.

The endless chain 4 is wound around three sprockets 14a, 14b, and 14c to form a circulating transfer path. The endless chains 4 are provided in two rows on both sides of the transfer path, and a plurality of bars 15 inserted between the chains 4 at predetermined intervals in the transfer direction.
, Each has a gripper 5 attached thereto. The gripper 5 grips a portion corresponding to a holding sheet piece 3a described later, which is a leading edge of the corrugated cardboard sheet 3 sent out from the paper feeding section 1.

The endless chain 4 is intermittently fed by a constant stroke, and the gripper 5 holding the corrugated cardboard sheet 3 includes a punching section 7, a stripping section 8, a product separating section 9, a displacement detecting section 10, and a holding sheet. One-side emission unit 1
In the order of 1, the sheet 3 stopped at each of these predetermined positions and subjected to the respective processes is intermittently transported.

A pair of punching dies 16 are set in the punching portion 7 above and below the transfer path. A punching cutting line 18 for forming a predetermined product part 3b is formed on the sheet 3, leaving a connection part 17 with the waste 3c. At the same time, product section 3b
A folding ruled line 19 for forming a box body is also provided.

In the stripping section 8, an upper mold 20 having a cutting tool and a lower mold 21 having a template having the same shape as the product section 3b are set above and below the transfer path.
Due to the relative vertical movement of the upper mold 20 and the lower mold 21, the connecting portion 17 is cut off from the sheet 3 in which the cutting line 18 is inserted while leaving the connecting portion 17 partially, and the holding sheet piece 3 a is formed. The punched waste 3c is removed from the portion other than the product part 3b.

The product separating section 9 is provided with a push-down plate 22, which breaks a connecting portion 17 between the holding sheet piece 3a and the product section 3b, thereby disposing a product conveyor disposed below the transfer path. Push down on 23. Product conveyor 23
Transports the pushed-down product part 3b to the next step.

The position shift detecting section 10 is provided at a position where the endless chain 4 goes around the upper side of the sprocket 14b, where the holding sheet piece 3a held by the gripper 5 which is temporarily stopped is moved. Photoelectric sensor 24 to detect
And a CCD (charge coupled device) video camera 25 for imaging the barcode 13 printed on the holding sheet piece 3a, and a lighting fixture 26 for imaging. The displacement detector 10 may be provided at any position where the gripper 5 intermittently stops in the process from when the holding sheet piece 3a is gripped by the gripper 5 to when it is released.

The photoelectric sensor 24 and the video camera 25
Is connected to an image processing device 27 that identifies the displacement and type of the barcode 13, as shown in FIG. The image processing device 27 is configured such that the photoelectric sensor 24
Is detected, the barcode 13 imaged by the video camera 25 is image-processed. As shown in FIG. 1, a signal of a proximity switch (not shown) provided on the shaft of the sprocket 14c around which the endless chain 4 is wound is also taken into the image processing device 27, and this signal, that is, the endless chain based on intermittently signal occurs in synchronism with the intermittent movement of each fixed stroke of 4, the next image of the bar code 13 already applied to the holding sheet strips 3a of the last that has been displayed Is updated to the image of the bar code 13 and the image is held until the next signal of the proximity switch is received. During this time, the operator can visually and accurately determine whether or not there is a shift in the extraction position with a margin.

FIG. 4 shows an operation panel 28 of the image processing apparatus 27. The panel 28 has a display screen 29 of the imaged barcode 13, two display lamps 30 for indicating success or failure according to the presence or absence of a punching position shift of the product unit 3 b, each cursor 31 a on the display screen 29,
An operation button section 32 for adjusting the positions of 31b and 31c, and a setting dial section 33 for setting the number of barcodes 13 and the allowable range of positional deviation are provided.

The operation button section 32 includes an operation button 32a for moving two vertical cursors 31a left and right, and an operation button 32b for moving a horizontal cursor 31b and a rectangular (cross-shaped) box cursor 31c up and down. , And an operation button 32c for moving the box cursor 31c left and right. Each of these operation buttons 32
a, 32b, and 32c are the holding sheet pieces 3 that are not displaced by the gripper 5 stopped by the displacement detection unit 10.
The bar code 13 is operated in advance in a state where the user holds the bar code a, and the bar code 13 at a normal position captured by the video camera 25 is placed between the two vertical cursors 31a, as shown on the display screen 29 in FIG. It is adjusted so as to be positioned on the horizontal cursor 31b. The box cursor 31c is adjusted so that its center matches the lower left corner of the barcode 13.

As described above, since the box cursor 31c independently has the function of a two-dimensional cursor in the horizontal and vertical directions, the adjustment is extremely simple, and the operator can easily and visually determine whether or not there is a displacement. The degree and the direction of the deviation can be determined.

In the setting dial section 33, there are arranged a dial 33a for setting the number of bar codes 13, and dials 33b and 33c for setting an allowable range of a deviation in the horizontal and vertical directions. Dial 33
By operating b and 33c, the left and right dimensions and the up and down dimensions of the box cursor 31c are respectively enlarged and reduced. As the size of the box cursor 31c is increased, the allowable range of the displacement of the punching position is increased.

Regardless of the state of the allowable range, if the lower left corner of the bar code 13 is within the frame of the box cursor 31c, the pass is determined. Either one lights up. It should be noted that the horizontal and vertical deviation allowable ranges are set separately from the frame of the box cursor 31c, and the bar code 13 from the center of the box cursor 31c is set.
If either of the horizontal and vertical shift amounts of the lower left corner of the above-mentioned corner exceeds the allowable range, it may be determined to be rejected. Further, the punching device may be automatically stopped based on a detection signal indicating rejection. Furthermore, the pass / fail can also be easily determined by the operator viewing the display screen 29.

The bar code 13 has a horizontal cursor 31 according to the number of product types set by the dial 33a.
It is scanned along b, and it is determined whether or not different types are mixed. Based on these determinations, the product portion 3b of the sheet 3 determined to be unacceptable or of a different type is determined by the product conveyor 2
3 Excluded from above.

Below the holding sheet releasing section 11, a scrap conveyor 34 is provided. At this position, the gripper 5 is released, and the unnecessary holding sheet 3a is released onto the scrap conveyor 34. Is done. The gripper 5, which has released the holding sheet piece 3a, re-feeds the sheet
It is transferred to.

In the above-described embodiment, the two-dimensional cursor for setting the permissible range of the displacement is a rectangular box cursor. However, a two-dimensional cursor of another shape such as a circle may be employed. Further, a bar code is used as the marking for detecting the displacement of the punching, so that mixing of different types can be detected. However, it is also possible to make the marking of a simple shape and perform only the detection of the displacement.

[0029]

As is evident from the foregoing description, vent displacement detection method of punching sheets of the invention, the marking image of the shape of the corner portion that is captured at the stop position of the hold member, intermittently the sheet transport unit Hold on the display screen until the marking of the next punched sheet is picked up by the proper transfer, and set the two-dimensional cursor on this display screen, and set the center of the two-dimensional cursor to the reference position when there is no slippage Then, since the allowable range of the deviation of the punching position from the center of the two-dimensional cursor is set, the operator can grasp the status of the deviation of the punching sheet on the stationary display screen, and determine whether or not the deviation of the punching position is acceptable. easily,
It can be performed accurately.

[0030]

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a sheet punching apparatus that employs a method for detecting a deviation of a punched sheet according to the present invention.

FIG. 2 is a bottom view taken along the line II-II of FIG.

FIG. 3 is a configuration diagram of an apparatus that realizes the method for detecting a displacement in FIG. 1;

FIG. 4 is a front view showing an operation panel of the image processing apparatus of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet feeder 2 kicker 3 sheet 3 a holding sheet piece 3 b product part 3 c punching waste 4 chain 5 gripper 6 sheet transporting part 7 punching part 8 stripping part 9 product separation part 10 displacement detection part 11 holding sheet piece discharge part DESCRIPTION OF SYMBOLS 12 Printing pattern 13 Barcode 14a, 14b, 14c Sprocket 15 Bar 16 Punching die 17 Connection part 18 Cutting line 19 Ruled line 20 Upper die 21 Lower die 22 Push-down plate 23 Product conveyor 24 Photoelectric sensor 25 Video camera 26 Lighting equipment 27 Image processing device 28 operation panel 29 display screen 30 display lamp 31a, 31b, 31c cursor 32 operation button section 32a, 32b, 32c operation button 33 setting dial section 33a, 33b, 33c dial 34 scrap conveyor

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiro Okamoto 49, Yamanamicho, Onomichi-shi, Hiroshima Okamoto Electric Co., Ltd. (56) References JP-A-60-76997 (JP, A) JP-A-3-3 137706 (JP, A) JP-A-59-26854 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B26D 7/01 B26D 5/34

Claims (1)

(57) [Claims] A sheet holding section for holding a sheet supplied from a sheet feeding section, which is held by a holder which moves intermittently;
Transfer, punching the sheet during this transfer, removing the punching waste, separating the product portion, and then releasing the holding sheet piece equivalent portion from the holder, the sheet punching device,
Wherein in the stop position of the holding sheet piece corresponding portion held by the holder, and sequentially captures the marking shape with corners that are subjected in advance to a predetermined portion of the holding sheet piece corresponding portion, which two by displaying on a display screen provided with a dimension cursor, Te method odor for detecting a disconnect position shift of the punching sheet, based on the intermittent movement in synchronism with the signal generated before Symbol retainer said marking The function of sequentially holding and updating the display screen on which is displayed is provided, and the center of the two-dimensional cursor is set to a position where the corner of the marking is displayed on the display screen in a state where the punched sheet does not slip out. In the case where the amount of deviation of the corner of the marking sequentially displayed on the display screen from the center of the two-dimensional cursor is out of the allowable range, the test is rejected. Vent position deviation detecting method for punching sheet, characterized in that so as to determine the that.