JP4722211B2 - Defective product discharge device - Google Patents

Description

  The present invention relates to a defective product discharge device, and more particularly to a defective product discharge device that sorts out defective products from a plurality of printing papers printed by a sheet-fed printing machine and discharges them easily and reliably. is there.

In general, a plurality of printed sheet-fed printing papers are conveyed by a conveying device provided on the downstream side of the sheet-fed printing machine, conveyed to a paper discharge unit, and stacked. However, if a defective product appears on the printing paper, the defective product must be sorted out and discharged. Conventionally, for defective products, after the computer processes the detection results of the quality inspection device, the pass / fail signal is shifted along the conveyance of the printing paper, and when the defective paper arrives at the stacking section, the signal is received and the tape marker is inserted into the tape It was sorted by doing.
The tape marker inserts and cuts the tape with a signal command only when the paper is defective, aiming at the space between the descending printing papers, but there is a problem that the reliability is poor. In other words, the paper may be slightly displaced from the defective paper, may enter the printing paper, or may not fall into the printing paper. In particular, entering the inside becomes a serious defect due to contamination of foreign matter.

In order to solve such a problem, a defective product sampling apparatus (for example, a sheet printing device that can easily and surely remove defective products from a sheet print book and organize the removed defective products (for example, Patent Document 1) and a defective booklet discharge device (see, for example, Patent Document 2) for a sheet-fed printing machine that can easily and reliably extract defective products from a sheet-printer.
However, in these apparatuses, since the nip roller is used for transporting the printing paper, there is a problem that it is inevitable that the printing paper is damaged due to scratches or rubbing.
In addition, the defective booklet discharging apparatus disclosed in Patent Document 2 has a structure in which the suction air of the suction wheel that contacts and sucks the booklet being conveyed is blocked by a valve. There is also a problem that it is not possible to follow the processing capacity of the sheet-fed printing press.

Japanese Patent No. 3737703 Japanese Patent No. 3737706

  Under such circumstances, the present invention can select a defective product from a plurality of printing papers printed by a sheet-fed printing press, and can easily and surely discharge the printed paper. It is an object of the present invention to provide a defective product discharge device that does not cause trouble due to friction or rubbing.

  As a result of intensive studies to achieve the above object, the present inventors have transported by the transport mechanism based on a quality inspection device for determining defective printing paper and a signal from the quality inspection device. An openable / closable front backing plate for stopping or passing the sheet printed paper, a good paper stacking portion where the good printing paper stopped by the front backing plate is dropped and stacked, and positioned downstream of the front backing plate Then, the present inventors have found that a paper discharge device having a defective product discharge mechanism having a specific function of discharging defective print paper that has passed through the front plate can meet the purpose. The present invention has been completed based on such findings.

That is, the present invention
(1) Defective product discharge that sorts out defective products of the printing paper conveyed by a conveyance mechanism that is provided on the downstream side of the sheet-fed printing press and continuously conveys a plurality of printing papers, and discharges the defective printing paper. A paper device, a quality inspection device for discriminating defective printing paper, and an openable / closable front end for stopping or passing the sheet-fed printing paper conveyed by the conveyance mechanism based on a signal from the quality inspection device A good paper collecting section where the good printing paper stopped by the front plate is dropped and collected, and the defective print paper passing through the front plate is discharged on the downstream side of the front plate. A defective product discharge mechanism that passes through the suction plate, a suction duct for adsorbing printing paper, an endless suction belt having air flowability and adsorbability, and the front plate. A defective paper discharge unit for storing defective printed paper A nozzle that blows out compressed air from above the tip of the suction duct is provided, and has means for blowing the compressed air from the nozzle in synchronization with the timing of passing defective paper based on a signal from the quality inspection device. Defective product discharge device,
(2) It has a nozzle that blows compressed air to the tip of the suction duct from above, and, based on the signal from the quality inspection device, opens the injection valve of the nozzle 14 in synchronization with the timing when the defective paper reaches the tip of the suction belt 2; defective sheet discharge apparatus according to (1) claim including means for compressing air ejection performing in phase with the timing of the defective paper passing blowing compressed air,
(3) A plurality of paper dropping fans are provided on the top surface of the good paper stacking unit, and the paper dropping fan has defective paper on the good paper stacking unit based on a signal from the quality inspection device. The defective product discharge apparatus according to (1) or (2) above, having means for opening and closing a louver for temporarily changing the air flow of the fan air to both sides and escaping when the air reaches.
(4) The left and right paper alignment plates provided on both sides of the upper surface of the good paper stacking unit are provided with a telescopic air cylinder for jogger motion, and the jogger motion of the air cylinder is When aligning good paper based on the signal, it has a means to perform jogger motion at the position where the piston of the air cylinder is extended, and to perform jogger motion with the piston of the air cylinder contracted when defective paper passes The defective product discharge device according to any one of (1) to (3) above,
(5) A brake suction wheel is provided in the vicinity of the upper surface upstream of the good paper accumulating unit, and air suction is performed on the brake suction wheel in synchronization with the timing of defective paper passing based on a signal from the quality inspection device The defective product discharge device according to any one of the above items (1) to (4), which has a shutter function for temporarily stopping
(6) The defective product discharge device according to any one of (2) to (5), wherein the quality inspection device is a scanner camera installed toward the position of the printing cylinder after completion of final printing, and (7 ) Conveying mechanism that conveys multiple printing papers continuously conveys printing paper to multiple grippers (claw cages) held in a circulating gripper chain and conveys them continuously to a good paper stacking unit. The defective product discharge device according to any one of (1) to (6), which is a mechanism,
Is to provide.

The defective product discharge device of the present invention has the following effects.
(1) Different from the uncertainty of inserting a tape marker by the signal of good and bad printing paper from a computer, such as a conventional defective product delivery device, the removal operation of only the defective paper is surely and easy. Can be done. Also, the sampling and sampling of the print result confirmation can be dropped on the same defective paper discharge unit to solve the difficulty and danger of this work. Further, generally, a sheet-fed printing machine performs about 30 sheets of waste (trial) printing for quality stabilization at the start of operation and restarting due to its characteristics. Therefore, it can be reliably guided to the defective paper removing device and stocked in the defective paper stacking portion (pocket).
(2) When inspection is not required, the apparatus can be stored on both sides (one side), and the operator can work in a work environment close to the state before the apparatus is attached.
(3) The device is a stand-alone unit and does not require major modifications for installation on a printing machine.
(4) Since there is no contact between the printing paper surface and the nip roller when the defective paper is discharged, there is no trouble caused by scratches or rubbing on the printing paper. As a result, a plurality of products are printed on a single sheet of printing paper by a normal sheet-fed printing press, but it is possible to remove only defective portions and rescue the remaining non-defective portions as products. .

It is the schematic of an example of the general sheet-fed printing machine which can attach the inferior goods discharge apparatus of this invention. It is explanatory drawing of an example of the paper discharge | emission accumulation | storage part in the conventional inferior-goods paper discharge apparatus. It is a side view of an example of the defective product discharge apparatus of this invention. It is a top view of an example of the defective product discharge apparatus of this invention. It is the figure seen from the defective paper discharge part side for demonstrating the function of the fan for paper dropping in an example of the inferior goods discharge apparatus of this invention. It is the figure seen from the defective paper discharge part side for demonstrating the additional function in an example of the inferior goods discharge apparatus of this invention. It is a figure for demonstrating the function of the suction wheel for brakes in an example of the inferior goods discharge apparatus of this invention.

The defective product discharge device according to the present invention sorts out defective printing paper conveyed by a conveyance mechanism that is provided on the downstream side of the sheet-fed printing press and continuously conveys a plurality of printing papers, and performs defective printing. A defective product discharge device for discharging paper,
A quality inspection device for discriminating defective print paper, an openable / closable front plate for stopping or passing the sheet-fed print paper conveyed by the conveyance mechanism based on a signal from the quality inspection device, and the front application A good paper stacking unit in which good print paper stopped by the plate is dropped and collected, and a defective product discharge mechanism that is located downstream of the front plate and discharges defective print paper that has passed through the front plate. And the defective product discharge mechanism stores a suction duct for adsorbing printing paper, an endless suction belt having air circulation and adsorbing properties, and defective printing paper that has passed through the front plate. And a defective paper discharge section.

Hereinafter, the defective product discharge device of the present invention will be described with reference to FIGS. 1, 2, 3A, 3B, 4, 5, and 6 of the accompanying drawings.
FIG. 1 is a schematic view of an example of a general sheet-fed printing machine to which the defective product discharge device of the present invention can be attached. FIG. 1 shows an example of a two-color machine.
As shown in FIG. 1, the printing paper loaded on the paper feeding unit is sequentially conveyed on a paper feeding table by a soccer mechanism (not shown) one by one, guided to the printing cylinder, and installed on each cylinder. It is replaced by the nail and delivered to the paper cylinder after printing. From the paper take-up cylinder, printing paper is sequentially picked up by a plurality of grippers (claw rods) held by a circulating gripper chain, and is transported to a good paper stacking unit for loading.

FIG. 2 is an explanatory diagram of an example of a paper discharge stacking unit in a conventional defective product discharge device.
As shown in FIG. 2, the printing paper after the final printing is transferred to a conveying gripper chain extending in a left-right circulation manner from the paper take-up cylinder and a gripper attached thereto, and is sequentially conveyed. There is a front plate at the front edge portion of the paper discharge stacking unit 30 for the purpose of aligning the front portion, and the printing paper released from the gripper at the paper release position is lowered and stacked along the front plate. During this time, the printing paper may be transported at 160 sheets per minute or more, and immediately after the gripper is opened, the speed is equivalent to this. Therefore, the printing paper collides with the front plate and bounces, and if it remains as it is, the purpose of perfect alignment is achieved. I don't get it.
For this reason, a brake suction wheel (hereinafter sometimes simply referred to as “suction wheel”) after the gripper is opened is provided at the bottom of the printing paper, and the collision speed of the printing paper is rapidly reduced.

This suction wheel has a structure in which a large number of suction holes or suction grooves are provided on the outer peripheral surface, and only the upper surface (sliding surface with the printing paper) of the suction wheel is sucked. The peripheral speed of the outer peripheral surface can be adjusted by rotation in the transport direction, and is set to about ½ to の of the transport paper, and is proportional to the transport speed thereafter.
The effect of the suction wheel is also to remove the curl of the printing paper that is passing through the suction wheel and bring it into a nearly flat state, thereby improving the alignment accuracy. A plurality of small paper removal fans are provided on the upper surface of the paper discharge stacking unit 30 and are blown with air so that the printed paper released from the gripper can be quickly dropped so that it cannot be kicked up by the next printed paper. .

The left and right paper alignment plates are provided for left and right alignment of the printing paper, and each time the printing paper enters, it escapes to the sides of about 10 mm to 20 mm and repeats the operation of aligning when falling. That is, the aligning operation of the sheet aligning plate coincides with the arrival timing of the printing sheet. The front plate at the front edge of the paper discharge stacking unit 30 is of an openable / closable type by a push button operation and can be manually removed to check the state of the printing paper (sampling paper removal).
The gripper shaft is provided with a roller lever for opening and closing the gripper shaft. When the print cylinder and paper take-up cylinder are replaced, and when the gripper is opened at the paper release position, the cam ( (Not shown) and contact with a roller lever.

FIG. 2 shows a general example of attachment of a quality inspection device camera and a tape marker for detecting good or bad printing paper and sorting out defective products. The detection by the camera after the end of the final printing requires a place where the printing paper does not flutter, so that it is easy to perform maintenance on the surface wrapped around the printing cylinder. In addition, the installation location of the tape marker is selected so that it can be aimed at the time when the printing paper is continuously falling, and the other machine parts are not obstructed.
After computer processing the detection result of the quality inspection device, the pass / fail signal is shifted along the conveyance of the printing paper, and when the defective paper arrives at the paper discharge stacking unit 30, the signal is received and the tape marker performs the tape insertion operation ( Like a “bookmark” in a book). The tape marker (details omitted) aims at the space between the descending papers and inserts and cuts the tape with a signal command only when the paper is defective. However, there is a problem that the reliability is poor. In other words, the paper may be slightly displaced from the defective paper, may enter the printing paper, or may not fall into the printing paper. In particular, entering the inside becomes a serious defect due to contamination of foreign matter.
In addition to the above, the biggest problem is that it is very difficult during operation to extract only the defective paper and check the inspection result each time using the defective paper signal.

3A and 3B are a side view and a top view, respectively, of an example of the defective product discharge apparatus of the present invention.
The attachment position of a quality inspection device (not shown) for discriminating defective printing paper is as shown in FIG.
An operator usually performs machine operation work at a place where the apparatus is installed, and it is most desirable to attach this part to a defective product discharge apparatus. The printing paper is conveyed to the paper release position by the paper conveying gripper 3 and collides with the front plate 1 to be accumulated. However, the defective paper is caused to fall backward by a signal from the quality inspection device, and the leading edge of the printing paper. Enters the suction belt 2 with suction holes, is sucked by the belt, and is dropped onto the defective paper stacking portion.
Further, when defective paper enters the tip of the suction belt 2 with suction holes, air can be blown onto the defective paper from above with the nozzles 14 to assist suction on the surface of the suction belt 2. Blowing at the time of entering the defective paper is preferable for reliably adsorbing the defective paper to the tip of the suction belt 2. The nozzle 14 can be sprayed continuously during operation of the printing press, but it is preferable that the gas is jetted from the nozzle only when a defective paper is generated in order to save the jet gas. .
At this time, it is desirable to blow the compressed air in synchronism with the timing of the defective paper passage based on the signal from the quality inspection device. It is desirable to provide the nozzle 14 with a shutter function that opens the injection valve of the nozzle 14 in synchronization with the timing when the defective paper reaches the front end of the suction belt 2 and closes the injection valve after the defective paper is adsorbed on the front end of the suction belt 2.
The peripheral speed of the suction belt 2 is set to be about 10% faster than the peripheral speed of the paper transport gripper 3 so that the defective paper discharge tail is not kicked by the front of the next paper to be discharged. Defective paper can escape before it closes.

  The suction duct 4 is for sucking suction air from a suction pump (not shown) through the duct to the suction belt 2 on an average and constant distance. A suction groove corresponding to the suction hole of the belt is provided on the upper surface of the duct, so that the flatness of the suction belt and the flowability of the suction air are taken into consideration. As for the duct shape, it is preferable to extend the duct to an acute angle (knife edge) to the limit of the front plate 1 in order to more completely absorb the discharged defective paper. This has the effect of expanding the adsorption area.

The suction belt 2 is driven by the drive motor 5 via the drive belt 6 and the corresponding drive roller 15. The defective paper after passing through the suction belt 2 is stored in the defective paper discharge section. In order to guide the defective paper to the defective paper discharge section, the defective paper that has passed through the suction belt 2 is used as a cushion belt guide. By stopping at 7, it is desirable to prevent the defective paper from being scratched. In this case, the tension of the belt can be adjusted correspondingly, and the adjustment is performed by the adjustment handle 8. A plurality of paper guide plates 16 are appropriately provided so that the paper does not jump out.
For example, in the case of eight-sheet printing paper, even a printing surface with one defective printing becomes defective paper and is sorted, but if this is cut, seven good printing papers can be obtained, It is important from the viewpoint of reducing the ratio of defective printing.
A set of defective paper discharge sections, that is, a suction belt 2, a suction duct 4, a drive motor 5, a drive belt 6, a drive roller 15, a cushion belt guide 7, an adjustment handle 8, a paper guide plate 16, and the like are held in the defective paper discharge frame 10. Thus, it is possible to make a double door opening around the pillar 9 (opening on one side is also possible). With the double door structure, it is possible to easily add the device of the present invention to an existing printer.

In the defective product discharge apparatus of the present invention, a paper dropping fan 11 is usually provided for forcibly dropping good print paper into the good paper stacking unit. However, the paper dropping fan 11 is obstructed when the defective paper passes. Therefore, it is preferable to temporarily change the air blowing position during the passage. Therefore, the paper dropping fan 11 opens and closes the louver and the louver to release the fan air to both sides based on a signal from the quality inspection device. It is preferable to have a means.
FIG. 4 is a view as seen from the defective paper discharge portion side for explaining the function of the paper dropping fan in the example of the defective product discharge device of the present invention. When the defective paper arrives, the defective paper signal shifted together with the defective paper causes the piston of the air cylinder 17 for stopping blowing to protrude, the rod 18 moves, the lever 19 is moved, and the air opening / closing louver 20 jumps upward. Then, the air that has been directed downward from the paper dropping fan 11 is blown in the horizontal direction to release the air. At this time, the wind of the paper dropping fan 11 does not press the surface of the defective paper, so there is no friction between the defective paper and the lower paper, and the leading edge of the defective paper reaches the end of the suction belt 2 and is smoothly laminated. The defective paper is discharged from the top of the section.

In addition, in the defective product discharge device of the present invention, for the purpose of normal paper alignment, a telescopic air cylinder is provided for jogging the left and right paper alignment plates provided on both sides of the upper surface of the good paper stacking unit. Although it is provided, this jogger motion acts as a brake for passing the defective paper.
In the present invention, the jogger motion can be stopped in synchronization with the timing of the defective paper passage based on the signal from the quality inspection device. For example, it is particularly desirable that the right and left paper alignment plates provided on both sides of the upper surface of the good paper stacking section are instantaneously stopped at a position where they are most retracted when the defective paper passes.
FIG. 5 is a view as seen from the defective paper discharge portion side for explaining an additional function in an example of the defective product discharge apparatus of the present invention, and shows a jogger between the left and right paper alignment plate 12 and the shaft 21. A view through a telescopic air cylinder 22 to be moved is shown.
When aligning the good printing paper performs jogger movement position where the piston is extended the air cylinder 22, when the defective paper passes, when intends rows jogger movement while the piston is contracted the air cylinder 22, paper The misalignment function is lost, and the defective paper can smoothly pass through the good paper lamination portion and reach the suction belt 2.

Furthermore, in the defective product discharge device of the present invention, it is preferable to provide a brake suction wheel having a shutter function for stopping air suction in the vicinity of the upstream side of the upper surface of the good paper stacking unit. The normal function of the brake suction wheel is as described in FIG.
FIG. 6 is a diagram for explaining the function of the brake suction wheel in the example of the defective product discharge device of the present invention. The brake suction wheel 13 has a segment-type shutter 23 at the upper surface discharge suction portion. Covered and temporarily opened and closed air suction is connected to the piston end of the air cylinder 24. The piston of the cylinder extends to cut off the air for passing the defective paper, and the piston shrinks and the suction hole passes through to suck the good printing paper. Without the suction of the brake suction wheel 13, the good-printed paper collides with the front plate, and the lamination is bent, so that smooth lamination is not possible.
However, when the defective paper is transferred, simply by opening the front plate, the suction of the brake suction wheel 13 makes it impossible for the defective paper to reach the suction duct. In the brake suction wheel according to the present invention, the shutter opening / closing air cylinder 24 is operated in synchronism with the timing of passage of the defective paper based on the signal from the quality inspection device, and the suction of air can be stopped.
By stopping the suction of air, the defective printing paper can be surely delivered to the suction duct through the open front plate because the brake is not applied.
In addition, in this invention, an electromagnetic solenoid etc. can be utilized as power other than an air cylinder, for example.

  The defective product discharge device according to the present invention can select a defective product from a plurality of printing papers printed by a sheet-fed printing press, and can easily and reliably discharge the defective product. In addition, the device is a stand-alone unit and does not require significant modifications to the printing machine. In addition, if inspection is not required, the device can be stored on both sides (one side), and the operator is in a state prior to installation. It is possible to work in a working environment close to.

DESCRIPTION OF SYMBOLS 1 Front plate 2 Suction belt 3 Paper conveyance gripper 4 Suction duct 5 Drive motor 6 Drive belt 7 Cushion belt guide 8 Adjustment handle 9 Pillar 10 Defective paper discharge frame 11 Paper dropping fan 12 Left and right paper alignment board 13 Brake suction wheel 14 Nozzle 15 Driving roller 16 Paper guide plate 17 Air cylinder for stopping air blowing 18 Rod 19 Lever 20 Air opening / closing louver 21 Shaft 22 Air cylinder 23 Segment type shutter 24 Air cylinder 30 Outlet collecting unit

Claims (7)

  A defective product discharge device that is provided on the downstream side of the sheet-fed printing machine and that sorts out defective printing paper conveyed by a conveyance mechanism that continuously conveys a plurality of printing papers and discharges defective printing paper. A quality inspection device for discriminating defective printing paper, and an openable / closable front plate for stopping or passing the sheet-fed printing paper conveyed by the conveyance mechanism based on a signal from the quality inspection device; A good paper stacking unit in which the good printing paper stopped by the front plate is dropped and collected, and a defective product that is located on the downstream side of the front plate and discharges defective print paper that has passed through the front plate. The defective product discharge mechanism has a suction duct for adsorbing printing paper, an endless suction belt having air flowability and adsorbability, and defective printing that has passed through the front plate. A defective paper discharge unit for storing paper; A nozzle that blows out compressed air from above the front end of the duct, and has means for blowing the compressed air from the nozzle in synchronism with the timing of passage of defective paper based on a signal from the quality inspection device. Defective product discharge device. It has a nozzle that blows compressed air from the top to the tip of the suction duct. Based on the signal from the quality inspection device, the injection valve of the nozzle 14 is opened in synchronization with the timing when the defective paper reaches the tip of the suction belt 2, and the defective paper passes. defective delivery according to claim 1 having a means for compressing air ejection performs blowing of the compressed air in phase with the timing of the.   A plurality of paper dropping fans are provided on the top surface of the good paper stacking unit, and when the defective paper reaches the good paper stacking unit based on a signal from the quality inspection device. The defective product discharge device according to claim 1, further comprising means for opening and closing a louver for temporarily changing the air flow of the fan air to both sides to escape.   The left and right paper alignment plates provided on both sides of the top of the good paper stacking unit are provided with a telescopic air cylinder for jogger movement. The jogger movement of the air cylinder is based on a signal from the quality inspection device. 2. When aligning good paper, the jogger motion is performed at a position where the piston of the air cylinder is extended, and when the defective paper passes, there is means for performing the jogger motion with the piston of the air cylinder contracted. The defective product discharge device according to any one of?   A brake suction wheel is provided in the vicinity of the upstream side of the upper surface of the good paper stacking unit, and air suction is temporarily performed on the brake suction wheel in synchronization with the timing of the passage of defective paper based on a signal from the quality inspection device. The defective product discharge device according to claim 1, further comprising a shutter function for stopping at once.   The defective product discharge device according to claim 2, wherein the quality inspection device is a scanner camera installed toward the position of the printing cylinder after completion of final printing. Conveying mechanism that transports multiple printing papers continuously, transports paper to the gripper chain that is held in a circulating gripper chain, and transports it continuously to a good paper stacking unit. The defective product discharge device according to claim 1.

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