JP2001151401A - Printing quality inspection system and printing quality control device of sheet printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve printing quality by making it possible to inspect printing quality without necessitating manual operation under an unfavorable working environment and without producing a stain and a scratch on a printed surface of a paper sheet in a printing quality inspection system and a printing quality control device for a paper sheet printing machine. SOLUTION: A printing quality inspection system for inspecting printing qualify and a printing quality control device for a sheet printing machine, comprises an inspection sheet delivering device 8 disposed separately from a normal sheet delivering device for delivering paper sheet in a normal time, for extracting part paper sheets among the above paper sheets to deliver them for printing quality inspection; a quality inspection unit 32 for inspecting printing quality of the paper sheets delivered from the inspection sheet delivering device 8; and a sheet transporting device 33 for transporting the paper sheets delivered from the inspection sheet delivering device 8 to the quality inspection unit 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing quality inspection for a sheet-fed printing press, which extracts a sheet printed by a sheet-fed printing press at a discharge section and checks the printing quality of the sheet. The present invention relates to a system and a print quality control device that performs correction control (feedback control) on a sheet-fed printing press based on an inspection result by the print quality inspection system.

[0002]

2. Description of the Related Art FIG. 10 is a diagram showing a configuration of a general sheet-fed printing press (hereinafter, simply referred to as a printing press) 50. As shown in FIG. 10, the sheet-fed printing press 50 includes a paper feed unit 21, a print unit 22, a paper discharge unit 2, and the like as main units (components). The operation of each of the devices 21, 22 and 2 is controlled by a controller 14.

[0005] The printing press 50 is provided with a print quality inspection device 5. The print quality inspection device 5 includes a color tone measuring table and the like, and a printing sheet (printed by the printing device 50). The print quality of the inspection sheet 1 extracted from the sheet 1 (hereinafter also referred to as a sheet or a sheet to be printed) 1 is inspected. Then, the inspection result is output from the print quality inspection device 5 to the control device 14, and the control device 14
Performs correction control (feedback control) of the printing press 50 based on the inspection result.

Hereinafter, a paper feed unit 21, a print unit 22, and a paper discharge unit 2
The function will be briefly described. First, the paper supply unit 21 will be described. As shown in FIG.
This is a unit in which a large number of sheets 1 to be printed are stacked on the sheet feeding table 24, and the stacked sheets 1 are sequentially supplied one by one from the uppermost side to the printing unit 22 in the next process.

Next, the printing unit 22 will be described. Generally, as shown in FIG. 11, the printing unit 22 includes a plurality of (four in this case) printing apparatuses 22a to 22d having different ink colors (print colors). And printing devices 22a-2
The printing apparatus 22a to 22d perform predetermined printing on the sheet 1 which is configured by interposing the intermediate cylinder 16 between each of the sheets 2d and continuously supplied from the sheet feeding unit 21 via the roll 51. Thereafter, the sheet 1 is fed to the paper discharge unit 2 on the downstream side.

Each of the printing devices 22a to 22d includes a plate cylinder 52a to 52d, a blanket cylinder 53a to 53d,
It is configured to include impression cylinders 15a to 15d. Each of the blanket cylinders 53a to 53d is interposed while being pressed between the plate cylinders 52a to 52d and the impression cylinders 15a to 15d. Is transferred to the blanket cylinders 53a to 53d and the impression cylinder 1
Printing is performed on the sheet 1 sent between 5a to 15d.

Next, the paper discharging unit 2 will be described. The paper discharging unit 2 transports the sheets 1 printed by the printing unit 22 and sequentially stacks them on the paper discharging table 13. When the set number of sheets 1 on the sheet 13 reaches a predetermined number, the sheet 1 is carried out of the sheet discharge table 13 to the outside, and the sheet discharge unit 2 is connected to the sheet conveying unit 2 a and the sheet stacking device 3. It is configured.

As shown in FIG. 12, the sheet transporting section 2a of the sheet discharging section 2 includes a sheet discharging cylinder 18, a sheet discharging shaft (hereinafter also referred to as a sprocket) 38 constituted by sprockets, and these sheet discharging cylinders. 18 and the endless chain 7 wrapped around the paper discharge shaft 38.
Is driven to rotate by the paper discharge cylinder 18 and the paper discharge shaft 38, and functions as a transfer unit for the sheet 1. That is, the endless chain 7 has a chain gripper 6 that can hold the sheet 1.
Are attached along the direction of movement of the endless chain 7. The chain gripper 6 grips the sheet 1 conveyed from the impression cylinder 15d of the printing device 22d after printing, thereby holding the sheet 1 Then, it is moved together with the endless chain 7 via the chain gripper 6 and transported to the sheet stacking device 3 (discharge table 13).

[0009] The endless chain 7 is provided on the discharge cylinder 1.
In addition to the paper discharge shaft 38, the paper is also wrapped around a traveling roll 18 a for forming a traveling path of the endless chain 7, whereby the endless chain 7 is attached to the paper ejection table 1.
3 to run horizontally. FIG.
As shown in FIG. 1, a sheet stacking device 3 having a sheet discharge table 13 is provided below the endless chain 7 on the downstream side. The paper discharge table 13 is suspended by a chain 13b wound around a sprocket 13a before and after the paper discharge table 13, respectively. The lifting / lowering motor 1 is mounted on each of the front and rear chains 13b.
3c, and the discharge table 13 is connected to the chain 1
The motor 13c is driven up and down through 3b to be controlled to a predetermined position.

Then, the sheet 1 after the predetermined printing is
In the discharge cylinder 18 of the paper discharge unit 2 from the printing unit 22 in the previous process, the paper is transferred to the chain gripper 6 of the endless chain 7 that is bridged between the paper discharge cylinder 18 and the sprocket 38, and is gripped by the chain gripper 6. Delivery table 1
After being transported to the upper position, it is released at a predetermined position (the grip of the chain gripper 6 is released), falls onto the discharge table 13 and is stacked.

The chain gripper 6 has a claw shaft 6 which moves integrally with the endless chain 7, as shown in FIG.
a and 6b, a claw portion 6c attached to the claw shaft 6a, and a claw seat 6d attached to the claw shaft 6b. The claw portion 6c is swingable about the claw shaft 6a (FIG. 1).
3), the claw seat 6d is fixed to the claw shaft 6b, and the claw portion 6c is urged by an urging member such as a spring (not shown) so as to contact the claw seat 6d. I have.
The claw portion 6c further includes a lever (not shown). When the claw portion 6c moves to a predetermined position on the paper discharge table 13, the lever is disposed on the paper discharge table 13 as shown in FIG. The pawl portion 6c is rotated in a direction away from the pawl seat 6d, whereby the sheet 1 is released from the chain gripper 6 as described above.

When the sheets 1 are sequentially input to and stacked on the sheet discharge table 13, the stacked sheets 1
In order to maintain the height of the upper surface of the sheet 1 at a predetermined height or less (the distance between the upper surface of the loaded sheet 1 and the sprocket 38, the chain gripper 6 and the like is necessary for work). Motor 1)
3c, etc., continuously or stepwise.
Lower 3 When a predetermined number of sheets 1 are stacked while such an operation is continued, as shown by a two-dot chain line in FIG.
Into the upper space), thereby inserting the partition plate 13d.
Subsequently, the sheets 1 to be put into the discharge table 13 are stacked on the partition plate 13d. Also, the partition plate 13d
At the same time as the sheet is inserted, the discharge table 13 is rapidly lowered to the lowermost position. At the lowermost position, the stacked sheets 1 are placed on a pallet placed below the sheets 1 (placed on the discharge table 13). 13e and carried out using a forklift or the like.

Subsequently, after a new pallet 13e is placed on the empty discharge table 13, the discharge table 13 is raised again to the initial position, and then the partition plate 13 is set.
d from the sheet input section, and the partition plate 13d
The sheet 1 temporarily supported by the
And the operation (operation) of the sheet stacking device 3 is restarted. Thereafter, printing can be continuously performed by repeating the same operation.

By the way, in order to maintain print quality, during normal printing, the sheet 1
The printing state is checked (quality inspection), whereby the judgment of good paper and defective paper (for example, confirmation of various printing qualities such as dirt, fluctuation of printing density, misregistration, etc.) is performed. Various setting changes (feedback control) are performed in accordance with the quality state of (1).
Hereinafter, while further describing the sheet stacking device 3,
A method for extracting the sheet 1 for quality inspection will be described.

As shown in FIGS. 12 and 13, the sheet stacking device 3 is provided with a paper abutment 10 on the upper and downstream side of the discharge table 13. The sheet 1 is gripped by the chain gripper 6 and is transported above the paper discharge table 13, and the chain gripper 6 is driven by the paper release cam 9 disposed above the paper discharge table 13 as described above. And the sheet 1 is opened.
It is released from the chain gripper 6 at an appropriate position above the 3. The sheet 1 released from the chain gripper 6 has been conveyed leftward in FIG. 13 by the chain 7 until immediately before, so it falls and moves leftward. (The left end in FIG. 13) is a backing plate 10 of a paper backing 10 indicated by a solid line in the figure.
a, so that the sheets 1 are stacked on the sheet discharge table 13 with their front ends aligned.

Further, the paper pad 10 is provided with a paper receiving plate 10b used at the time of sheet removal in addition to the pad plate 10a. The abutment plate 10a is attached to a fulcrum shaft 23 rotatably supported by a frame (not shown), and the abutment plate 10a is configured to swing around the fulcrum shaft 23. Further, the paper receiving plate 10 b
3 through a link mechanism 23a to 23e, which is simplified and linked to the swing of the backing plate 10a, and is inserted and removed above the sheet discharge table 13.

That is, one end of a link 23a is fixed to the fulcrum shaft 23, and the other end of the link 23a is
The other end of the link 23b is pin-connected to one end of the link 23c. The other end of the link 23c is fixed to a fulcrum shaft 23d rotatably supported by a frame (not shown). The fulcrum shaft 23d has a rear end portion of the paper receiving plate 10b (the left end in FIG. 13). The other end of the link 23e, one end of which is pin-coupled to the other end, is fixedly provided. Thereby, the backing plate 10a and the paper receiving plate 10b are interlocked.

As described above during normal printing, FIG.
As shown by a solid line in FIG. 3, the backing plate 10a is in an upright state so as to restrict the movement of the sheet 1 in the conveying direction by the chain 7, and the paper receiving plate 10b is at the right end in FIG. The unit is set at a position (retracted position) where it is removed from above the sheet discharge table 13 so as to be off the trajectory where the sheet 1 falls to the sheet discharge table 13. Then, at the time of sheet removal, the backing plate 10a is swung about the fulcrum shaft 23 from the state shown by the solid line in FIG.

Then, in conjunction with this, the paper receiving plate 10b
Is inserted from the retreat position shown by the solid line in FIG. 13 to the advance position shown by the solid line. In addition, a stopper 10c is attached to the swinging end of the backing plate 10a, whereby the backing plate 10a is in the upright state shown by the solid line in FIG. In this state, the sheet 1 falling from the upper chain 1 is prevented from falling off from above the backing plate 10a.

The operation of the paper pad 10 is as follows.
The manual operation is performed by an operator, and when the sheet 1 is extracted from the sheet discharge table 13 for quality inspection, the operator needs to close the traveling of the sheet 1 conveyed while being held by the chain gripper 6 after printing. By operating the paper contact 10 at a predetermined timing while visually observing the above, as shown by a two-dot chain line in FIG. 13, the contact plate 10a is swung back and the paper receiving plate 10b is inserted into the forward position.

As a result, of course, the backing plate 10a
Cannot restrict the movement of the sheet 1 released from the chain gripper 6 in the transport direction by the chain 7, and the sheet 1 is temporarily received by the paper receiving plate 10b at the advanced position. During this time, the paper discharge table 13
One or more sheets 1 for quality inspection are manually extracted from the upper stage of the stacked sheets 1 by an operator. Then, after extracting the sheet 1 for quality inspection, the backing plate 10a and the paper receiving plate 10b are returned to the state shown by the solid line in FIG. 13, and at this time, the sheet 1 borrowed by the paper receiving plate 10b is removed. , Paper receiving plate 1 in the retracted position
The sheets 1 are dropped so as to slide from 0b, and are stacked on the uppermost stage of the sheets 1 stacked on the discharge table 13.

The sheet 1 extracted for inspection by the above-described operation is inspected by visual inspection or by a printing quality inspection apparatus (for example, a color tone) separately provided by an operator as shown in FIGS. (Measurement table) 5 and the like, where quality (for example, color tone) inspection is performed. Then, the inspection result (quality information) is output from the print quality inspection device 5 to the controller 14, and the controller 14 performs feedback control (for example, color tone control by correcting the ink amount) by the controller 14 based on the quality information.

[0023]

However, the above technique has the following problems. That is, as described above, the work of extracting the inspection sheet 1 is performed by the operator close to the printing press 50 (the paper discharge table 13).
The surroundings of the printing press 50 are noisy, powder powder to be adhered to the sheet 1 for preventing adhesion is scattered, and IR (infrared) and UV from a dryer for drying ink of the sheet 1 are used. This is not a favorable environment for the worker because irradiation with (ultraviolet light) or the like is performed.

Further, since the inspection sheet 1 is manually extracted from the upper stage of the sheets 1 stacked on the sheet discharge table 13 by an operator, this manual operation causes the printing surface of the inspection sheet 1 to be printed. Dirt and scratches occur, which
There is a problem that the quality inspection of the sheet 1 cannot be performed correctly. When the sheet 1 for inspection is removed, not only the sheet 1 for inspection but also the sheet 1 immediately below the sheet 1 for inspection, that is, the sheet 1 as a product is stained on the printing surface. And abrasion may occur.

The present invention has been made in view of the above problems, and eliminates the need for manual work in an unfavorable working environment and prints without causing stains, scratches, etc. on the printing surface of the sheet. An object of the present invention is to provide a print quality inspection system and a print quality control device of a sheet-fed printing press, which can perform a quality inspection and improve a print quality.

[0026]

According to a first aspect of the present invention, there is provided a print quality inspection system for a sheet-fed printing press according to the present invention, which prints a sheet printed by the sheet-fed printing press. A printing quality inspection system for a sheet-fed printing press that removes and inspects print quality, and is provided separately from a normal sheet ejection device that ejects the sheet at a normal time, and a part of the sheet. An inspection sheet ejection device that extracts a sheet and discharges it for print quality inspection; a quality inspection unit that inspects print quality of the sheet discharged by the inspection sheet ejection device; The apparatus is characterized in that it comprises a sheet transfer device for transferring the sheet discharged by the inspection sheet discharge device to the print quality inspection section.

According to a second aspect of the present invention, there is provided a printing quality inspection system for a sheet-fed printing press according to the first aspect, wherein the inspection sheet discharging device is provided with the normal sheet-fed printing apparatus. It is characterized in that it is provided upstream of the sheet discharging device in the transport direction of the sheet. According to a third aspect of the present invention, there is provided the printing quality inspection system for a sheet-fed printing press according to the first or second aspect, wherein the sheet transport device is discharged by the inspection sheet discharging device. A sheet unloading device that unloads a sheet to the outside of the sheet printing press, and a sheet transport device that transports the sheet unloaded by the sheet unloading device to the quality inspection unit. And a guide for guiding the sheet conveyed by the sheet conveyer to a predetermined location of the quality inspection section.

According to a fourth aspect of the present invention, there is provided a printing quality inspection system for a sheet-fed printing press according to the present invention, wherein the sheet-ejecting device for inspection includes an extraction mechanism for extracting the sheet from the sheet-fed printing press; And a belt conveyor for receiving the sheet extracted by the extracting mechanism, and the belt conveyor is also used as the sheet unloading device. Claim 5
A print quality control device for a sheet-fed printing press according to the present invention includes a print quality inspection system for a sheet-fed printing press according to any one of claims 1 to 4, and further includes a sheet-fed printing press. It is configured with a control device for controlling, the control device, based on the detection information from the print quality inspection system,
The present invention is characterized in that feedback control is performed on a control element relating to print quality of the sheet-fed printing press.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. First, a print quality inspection system and a print quality control device according to a first embodiment of the present invention will be described. 1 to 5 are diagrams showing a print quality inspection system and a print quality control device of the present embodiment. FIG. 1 is a schematic diagram showing the overall configuration, and FIG. 2 is a schematic diagram showing the configuration of a paper discharge unit. (A) is a plan view,
FIG. 3B is a side view, and FIG. 3 is a sheet discharge device for inspection (a sheet discharge device for inspection) and a sheet transfer device [FIG.
C section], (a) is a cross-sectional view as viewed from the front, (b) is a plan view, (c) is a cross-sectional view as viewed from the side, and FIG. FIG. 5 is a schematic side view showing a configuration of a sheet transport device and a guide (E portion in FIG. 1), and FIG. 5 is a schematic plan view showing a configuration of a modified example of a belt conveyor (sheet-feeding device). The same components as those in the related art (FIGS. 10 to 13) are denoted by the same reference numerals, and detailed description thereof will be omitted.

As a first embodiment of the present invention, a print quality inspection system (hereinafter, simply referred to as a quality inspection system) and a print quality control device (hereinafter, also simply referred to as a quality control device).
Is configured as shown in FIG. The quality inspection system consists of multiple (here, three) printing machines (sheet-fed printing machines)
This is for periodically inspecting a sheet (sheet) 1 printed by 50a, 50b, 50c (hereinafter, referred to as a printing press 50 unless otherwise specified). The quality inspection system includes an inspection sheet ejection device (inspection sheet ejection device, hereinafter, also simply referred to as a sheet ejection device) 8 and a print quality inspection unit (a place where the print quality is inspected, here a control room). ) 32, and a sheet transporting device 33 including a belt conveyor 4, a sheet transporting device 33a, etc., and the inspection sheet discharging device 8 is provided in the discharging portion 2 of the printing press 50. It is provided separately from the normally used sheet stacking device (normal sheet discharging device) 3.

With such a configuration, the sheet 1 extracted for inspection by the inspection sheet discharging device 8 is transferred from the printing press 50 to the control room 32 without manual operation, and the print quality is controlled in the control room 32. The quality of the sheet 1 can be inspected by the inspection device 5 or visually. In addition, the quality control device, such a quality inspection system,
Each of the printing presses 50a, 50b, 50 is disposed in the control room 32.
c that remotely controls each of the printing presses 50a, 50a based on the inspection result of the quality inspection system.
Feedback control is performed on the control elements b and 50c. That is, the plurality of printing presses 50a, 50b,
Inspection sheet 1 selectively and appropriately extracted from 50c
However, the printing state (quality) is checked by the common print quality inspection device 5 provided in the control room 32 or visually.
On the basis of this result, the control elements of the corresponding printing presses 50a, 50b, and 50c (from which the sheet 1 has been extracted) are subjected to correction control (feedback control) by the control device 14.

Hereinafter, the inspection sheet discharge device 8, the sheet transfer device 33, the print quality inspection device 5, and the control device 14 will be described in detail. First, the inspection sheet discharging device 8 will be described. As shown in FIGS. 2A and 2B, in the present embodiment, the horizontal transfer unit of the endless chain 7 including the chain gripper 6 is a conventional device (FIG. 2). 1
2) in the direction of travel of the seat 1
The sheet discharging device 8 is disposed in the extension at an upstream side of the normally used sheet stacking device 3. That is, the sheet discharging unit 2 is connected to the sheet stacking device 3 which is normally used,
It is configured as a double system including an inspection sheet discharging device 8 for extracting the sheet 1 from the printing press 50 for inspection.

The inspection sheet discharge device 8 is provided below the endless chain 7 and conveys the sheet 1 in a direction perpendicular to the sheet conveying direction of the chain 7 (the width direction of the sheet 1). The belt conveyor 4 is also a component of the sheet transporting device 33 as described later. .

The paper release cam 11A is connected to the endless chain 7
An operating position for abutting a not-shown lever of the chain gripper 6 attached to the chain gripper 6 to open and drive the chain gripper 6;
A non-operating position in which the lever of the chain gripper 6 does not contact (does not drive the chain gripper 6) can be selectively set. When the sheet 1 is to be extracted for inspection, the paper is released at a predetermined timing. By setting the cam 11A to the operating position, the chain gripper 6 that is conveying the sheet 1 to the sheet stacking device 3 is driven to open. This releases the sheet 1 from the chain gripper 6.
Are dropped on the belt conveyor 4.

Next, a description will be given of a sheet transporting device 33 for transporting the inspection sheet 1 discharged by the inspection sheet discharging device 8 from the inspection sheet discharging device 8 to the control room (print quality inspection section) 32. I do. As shown in FIG. 1, the sheet transporting device 33 includes a belt conveyor (sheet transporting device) that transports the inspection sheet 1 extracted from the printing press 50 by the inspection sheet discharging device 8 to the outside of the printing press 50. Device) 4
And a sheet transporting device 33 a for transporting the sheet 1 carried out by the belt conveyor 4 to the control room 32, and a sheet transporter 33 a for transporting the sheet 1 transported by the sheet transporting device 33 a in the control room 32. (Predetermined portion) 30 and a guide 31 for guiding the quality inspection device 5.

Here, the belt conveyor 4 is configured to transfer the sheet 1 sent from the upper chain 7 while holding the sheet 1 by vacuum suction. That is, as shown in FIG. 3C, the belt conveyor 4 includes rolls 4c, 4c for driving the belt 4d, and a belt 4d wound around the rolls 4c, 4c. Between the upper and lower sides of the belt 4d (inside the belt conveyor 4), FIG.
As shown in (a) to (c), a vacuum box 27 is provided, and a vacuum source (for example, a vacuum pump) (not shown) is connected to the vacuum box 27 via a suction pipe 29. Is evacuated. The belt 4d runs on the upper part of the vacuum box 27, and a plurality of belts (here, three rows and three rows of 9
) Of suction holes 28 are provided as a set, and a plurality of suction holes 28 are provided at predetermined intervals in the sheet 1 transfer direction. This allows
By supplying vacuum to the suction holes 28 via the vacuum box 27, the sheet 1 on the suction holes 28 is vacuum-sucked to the belt 4d.

The sheet 1 released from the chain gripper 6 of the chain 7 and falling onto the belt conveyor 4
Falls in the direction of conveyance by the chain 7 (to the left in FIGS. 3A and 3B), so that the leading end position of the sheet 1 is located on the side of the belt conveyor 4 in the direction of conveyance of the chain 7. Is provided with a paper pad 12 and a paper alignment device (not shown).

Then, the belt conveyor 4 is stopped during standby until the inspection sheet 1 is sent from the upper chain 7, and during this standby, a set of suction holes 28 is opened. The belt conveyor 4 is positioned so as to be located at the center in the width direction of the sheet 1 conveyed above the sheet discharge device 8. As a result, as shown in FIG. 3B, one set of suction holes 28 is set so as to be located at the center of the sheet 1 immediately after being sent from the upper chain 7, and as shown in FIG. )
Sheets 1 of different sizes indicated by two-dot chain lines therein can be stably adsorbed.

When the inspection sheet 1 is sent from the upper chain 7 (when the sheet 1 is placed on the belt 4d), the vacuum box 27 is evacuated by the vacuum source, and the suction hole 28 is set in the suction state. At the same time, the belt 4d is driven by the roll 4c, whereby the sheet 1 is moved together with the belt 4d while being sucked by the suction holes 28. Thereafter, the sheet 1 is transferred to the sheet transporting device 33 disposed at the subsequent stage.
a, the vacuum suction by the belt conveyor 4 is stopped (the supply of vacuum from the vacuum source is stopped), and the leading end position is defined by the stopper 26a. The section is held (gripped) by the transport gripper 25 of the sheet transporting device 33a, whereby the sheet 1 is delivered from the belt conveyor 4 to the sheet transporting device 33a.

The sheet transport device 33a transports the sheet 1 carried out by the belt conveyor 4 to the vicinity of the quality inspection device 5 as described above.
As shown in FIGS. 4B and 4C and FIG.
A transport gripper 25 attached to the drive chain 34 at a predetermined interval to hold the sheet 1;
The transport gripper 25 can be moved along the transport rail 26 by driving the drive chain 34 with a drive device (not shown). Each transport gripper 25 can be opened and closed at a predetermined timing by the device.

The transport rail 26 is provided from the rear end of the belt conveyor 4 in the sheet transport direction to the upper part of the quality inspection device 5 (paper inspection table 30) in the control room (print quality inspection unit) 32. Printing machine 5 by the belt conveyor 4
In a state where the sheet 1 conveyed to the outside is gripped by the transport gripper 25 at a predetermined position, and then the driving chain 34 is driven, the sheet 1 is suspended by the transport gripper 25 as shown in FIG. Can be conveyed to the control room 32. Then, when the sheet 1 moves to above the guide 31 in the control room 32, the grip by the transport gripper 25 is released, and the sheet 1 dropped on the guide 31 is guided by the guide 31 and It is sent to the quality inspection device 5 placed above the (predetermined point) 30 and stops on the quality inspection device 5.

In this case, the direction of the transport rail 26 is changed in the direction perpendicular to the paper surface in FIG. 4 inside the control room 32 so that the sheet 1 can be easily sent to the paper inspection table 30. The guide 31 has a predetermined width in a direction perpendicular to the sheet of FIG. 4 so that the sheet 1 falling from the transport gripper 25 of the transport rail 26 in such a state can be guided. have. Further, as shown in FIG. 3C, the transport rail 26 is lifted up to a predetermined position on the downstream side of the belt conveyor 4 in the sheet transport direction, whereby the transport rail 26 is transported while being suspended by the transport gripper 25. The lower end of the sheet 1
As shown in FIG. 4, the position is set higher than the worker, and the movement and the work of the worker are not hindered by the seat 1.

Next, the quality inspection device 5 and the control device 14 will be described. As shown in FIG. 4, the quality inspection device 5 includes a paper inspection table (predetermined location) 30 in a control room (quality inspection unit) 32.
The print quality of the inspection sheet 1 is inspected. Here, the color tone, which is one parameter related to the print quality, is inspected. The result (quality information) is output from the print quality inspection device 5 to the control device 14, and the control device 14 corrects the ink amount of each of the printing presses 50a, 50b, 50c based on the quality information. Then, the deviation between the actual color tone detected by the print quality inspection device 5 and the target color tone is corrected, and the color tone is feedback-controlled.

Also, such feedback control is
By switching the electric circuit via the control device 14, the printing machine 5 corresponding to the sheet 1 extracted for inspection
0, that is, the printing press 5 from which the inspection sheet 1 was extracted
0 can be selected and performed. Therefore, each of the printing presses 50a, 50b, and 50c can individually perform correction (feedback control) in accordance with the state of print quality so that the printed matter is of high quality.

In the conventional apparatus shown in FIGS. 12 and 13, the sheet stacking device 3 is provided with the paper abutment 10 for defining the position of the sheet 1 sent to the discharge table 13 as described above. The position of the paper pad 10 can be changed between normal printing (when the sheet 1 is not extracted for inspection) and when the sheet 1 is extracted for inspection. Now, Figure 2
As shown in FIG. 2B, since the inspection sheet discharging device 8 is provided separately from the sheet stacking device 3, a paper sheet having a fixed position is used instead of the paper pad 10 whose position can be changed as in the conventional example. A contact 10d is provided.

According to the print quality inspection system and the print quality control device as the first embodiment of the present invention, the print quality inspection and the print quality control are performed as follows. First, the case where the printed sheets 1 are stacked as products on the discharge table 13 of the sheet stacking device 3 is shown in FIG.
This will be described with reference to (b). In this case, the paper release cam (gripper opening / closing cam) 1 provided in the sheet discharge device 8
1A is set to a non-operation position where the chain gripper 6 is not driven to open. As a result, the sheet 1 gripped by the chain gripper 6 and conveyed by the chain 7 passes above the sheet discharge device 8 (belt conveyor 4) while being gripped by the chain gripper 6. Then, this sheet 1
When the chain gripper 6 gripping is moved above the discharge table 13 of the sheet stacking device 3, the chain gripper 6 is driven to open by the paper release cam 9, whereby the chain gripper 6 is gripped so far. The sheet 1 that has been released is released from the chain gripper 6 and falls onto the discharge table 13 below.

The sheets 1 successively falling on the discharge table 13 are stacked on the discharge table 13 in a state where the sheets 1 are brought into contact with the paper contact 10d and their front ends are aligned. The sheet is conveyed out of the sheet discharge table 13 into a bundle by the same operation as the related art. Next, the case of extracting the sheet 1 for inspection is shown in FIG.
(B) With reference to FIGS. 3 and 4, in this case, the extraction mechanism 11 is operated. In other words, the paper release cam 11A above the belt conveyor 4 is set to the operating position, and the paper release cam 11A drives the chain gripper 6 that has been moved above the belt conveyor 4 while holding the sheet 1 to open. The sheet 1 being conveyed by the chain 7 is released from the chain gripper 6 and the belt conveyor 4 is opened.
Drop it up. Then, on the belt conveyor 4, 1
After dropping a predetermined number of sheets or a predetermined number of sheets, the paper release cam 11A is moved to the non-operation position, whereby the succeeding sheets 1 sequentially transferred pass over the belt conveyor 4 and are stacked. The paper release cam 9 above the device 3 releases the gripper of the chain gripper 6 and drops onto the discharge table 13 to be stacked.

Then, the sheet 1 dropped onto the belt conveyor 4 is carried out to the outside of the printing machine 50 while being vacuum-sucked by the belt conveyor 4, as shown in FIGS. Then, the sheet 1 on which the belt conveyor 4 is adsorbed
Reaches a predetermined position, the suction of the sheet 1 by the belt conveyor 4 is stopped, and at this position, the belt conveyor 4
The side edge of the upper sheet 1 is the conveying gripper 2 which has been waiting.
5 is held. The sheet 1 is conveyed along a conveying rail 26 by a driving chain 34 via a conveying gripper 25, and thereafter, is conveyed to an upper portion of a guide 31 in a control chamber 32 as shown in FIG. The print quality inspection device 5 on the paper inspection board 30 is guided by the guide 31 after being released from the reference paper 25. Then, a predetermined quality inspection is performed by the print quality inspection device 5 or visually, and based on the inspection result, each of the printing presses 50a, 50
Feedback control is performed by Ob and 50c (including control by manual operation performed based on the quality inspection result by visual observation).

Therefore, according to the print quality inspection system and the print quality control apparatus of the present embodiment, the sheet 1 for quality inspection can be automatically extracted and transported to the print quality inspection apparatus 5 without manual operation. The quality inspection by the print quality inspection device 5 and the control of the printing press 50 by the control device 14 are performed in another inspection room (control room) 32 separated from the room (factory) in which the printing press 50 is disposed. As described above, there is an advantage that the operation of the operator in an environment where noise, scattering of powder powder, irradiation of an IR (or UV) lamp or the like is performed in a factory as in the related art is unnecessary. is there.

According to the printing quality inspection system and the printing quality control device, the pulling-out mechanism 11 moves the paper release cam 11A on the belt conveyor 4 to the operating position, so that the paper release cam 11A , Chain gripper 6
And the sheet 1 held by the chain gripper 6 is released from being held by the chain gripper 6 at a predetermined position and at a predetermined timing. Therefore, it is not necessary to perform the conventional manual operation, and naturally, when extracting the sheet 1 for the quality inspection, no special technique is required and the extraction can be performed stably. In addition, there is an advantage that the quality inspection can be performed with high accuracy by preventing the printed surface of the quality inspection sheet 1 from being stained or scratched.

Further, since the sheet discharge device 8 for extracting the sheets 1 for quality inspection is provided separately from the discharge table 13 on which the sheets 1 as products are stacked, as in the prior art, the sheet discharge device 8 is used as a product. In order to extract the inspection sheet 1 from the uppermost stage of the sheets 1 stacked on the sheet discharge table 13, the sheet 1 below the inspection sheet 1, that is, the printing surface of the sheet 1 to be carried out as a product is stained. There is also an advantage that generation of scratches and the like can be prevented.

Since the inspection sheet discharging device 8 is arranged on the upstream side of the normal sheet stacking device 3 also provided in the conventional device (see FIGS. 11 and 12), the configuration of the conventional device is reduced. With a simple configuration in which the conventional apparatus is simply provided with the inspection sheet discharging device 8 with almost no change,
There is also an advantage that the inspection sheet 1 can be stably extracted. A sheet transporting device 33 for transporting the inspection sheet 1 from the inspection sheet discharging device 8 to the print quality inspection device 5 includes a belt conveyor 4 and a sheet transporting device 3.
3a and the guide 31, the transfer distance from the inspection sheet discharge device 8 to the print quality inspection device 5 is relatively long, and even in an environment where the installation space is difficult to take, the surrounding space conditions and the like can be reduced. Accordingly, there is an advantage that the transfer route can be appropriately set.

Further, since the sheet unloading device 4 for transferring the inspection sheet 1 extracted by the inspection sheet discharging device 8 to the sheet conveying device 33a is constituted by a belt conveyor, the sheet conveyor is constituted by a belt conveyor. The sheet 1 can be transferred to the sheet transporting device 33a in a stable state in which the sheet 1 is placed, and the sheet 1 can be reliably gripped by the transport gripper 25 of the sheet transporting device 33a. is there.

Further, the print quality control apparatus has an advantage that the feedback control can be appropriately performed based on the high-precision quality inspection performed by the print quality inspection system, thereby improving the print quality. . In the above-described embodiment, the inspection sheet discharge device 8 is disposed on the upstream side of the normally used sheet stacking device 3. However, if it is preferable for the surrounding space, It may be arranged downstream of the sheet stacking device 3. In this case, the paper release cam 9 of the sheet stacking device 3 is
The paper release cam 1 of the inspection sheet discharge device 8 is configured so that it can be selectively set to an operation position where the chain gripper 6 is driven to open and a non-operation position where the chain gripper 6 is not driven.
The extraction mechanism 11 may be configured so that 1A is always in contact with the lever of the chain gripper 6.

In the above-described embodiment, the belt conveyor 4 uses a single wide belt 4d. Instead, a plurality of narrow belts 4a, 4a as shown in FIG.
b may be used. The belt 4a is provided with a plurality of suction holes 28, and the vacuum box 27 is disposed below the belt 4a so that a vacuum is efficiently supplied to the suction holes 28 from the vacuum box 27. It is also desirable to set the width to be sufficiently large.

Next, a print quality inspection system and a print quality control device according to a second embodiment of the present invention will be described. 6 to 8 are views showing a print quality inspection system and a print quality control device of the present embodiment. FIG. 6 is a schematic side view showing the configuration of the paper discharge unit, and FIG. FIG. 8 is a schematic plan view showing a main part configuration, and FIG. 8 is a schematic side view sectional view (corresponding to a sectional view taken along the line FF in FIG. 7) showing the structure of the belt conveyor (sheet-feeding device). Figure)
It is. FIGS. 1 and 3A used in the first embodiment.
(C) and FIG. 4 will also be described.

The same components as those described in the related art and the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The print quality inspection system and the print quality control device of the present embodiment are the same as those of the first embodiment described above, except that the inspection sheet ejection device (inspection sheet ejection device) is used.
8 (see FIGS. 2 (a) and 2 (b)), the inspection sheet discharging device 8a of the present embodiment is different from that of FIG.
As shown in the figure, the sheet discharging section 2 is provided above the sheet stacking device 3 and upstream in the sheet conveying direction of an intermediate cylinder 17 described later. In addition, the inspection sheet discharging device 8
The inspection sheet 1 sent from the inspection sheet discharging device 8a is held between the sprocket 38c and the sprocket 38 at the rear end (the end on the downstream side in the sheet conveyance direction) by vacuum suction. Belt conveyor 4 to be carried out to the outside of the printing press 50 [refer to FIGS.
(See (c)), and the belt conveyor 4
As shown by a solid line or a broken line in FIGS.
Is transported in a direction perpendicular to the sheet transport direction by the chain 20 of the inspection sheet discharge device 8a. At the downstream side of the belt conveyor 4 in the sheet conveying direction, the front end of the sheet 1 dropped from the sheet discharging device 8a for inspection (the sheet conveying direction side of the sheet discharging device 8a for inspection) as in the first embodiment. Paper end 12 for regulating the position of the end of the paper).

Hereinafter, the inspection sheet discharging device 8a will be further described. As described above, the inspection sheet discharging device 8a is provided above the sheet stacking device 3 in the sheet discharging section 2 as shown in FIG. ing. The inspection sheet discharge device 8a is disposed above the intermediate drums 16a and 17, the discharge drum 19, the sprocket 38c, the endless chain 20 bridged between the discharge drum 19 and the sprocket 38c, and the belt conveyor 4. The paper release cam 11A is provided. Endless chain 20 has
A plurality of chain grippers 6 for gripping the sheet 1 are attached, and a pull-out mechanism 11 is configured by the chain gripper 6 and the paper release cam 11A. In the extraction mechanism 11, the chain gripper 6 is driven to open by a paper release cam 11A.

The intermediate cylinders 16a and 17 are disposed between the impression cylinder 15d of the most downstream printing device 22d and the discharge cylinder 18 conventionally provided in the discharge section 2 from the upstream side in the sheet conveying direction. The intermediate cylinder 17 is provided with the two discharge cylinders 18 and 19 in this order.
It is provided so as to face. Further, the intermediate drum 17 is provided with a claw device (not shown) for gripping the sheet 1 and, as shown in FIG. 6, a gripper changing cam 37a for opening the claw of this claw device (opening the claw device). 37b
Is attached. These gripper cams 37
The a and 37b are fixed to a frame (not shown) that supports the intermediate cylinder 17, for example. When the pawl device is rotated integrally with the intermediate cylinder 17 and reaches a predetermined position, the gripper changing cams 37a and 37b are attached to the jaws. When driven, the pawl device opens. When the sheet 1 is delivered to the paper discharge drum 19, the gripper changing cam 37a opens the claw device for gripping the sheet 1 at an appropriate timing (releases the gripping of the sheet 1). The gripper changing cam 37b drives the pawl device to open when the sheet 1 is transferred to the discharge cylinder 18.

The gripper changing cam 37a is connected to the intermediate cylinder 1
7 can be selectively set to one of an operating position where the claw device 7 is driven to open and a non-operating position where the claw device is not driven to open, and the sheet 1 is discharged from the sheet discharge cylinder 19 (inspection sheet discharge device 8a). To the working position, while the seat 1
To the discharge cylinder 18 [sheet stacking device (normal sheet discharging device)
3) is set to the non-operation position. Also, the discharge cylinder 1
Reference numeral 9 denotes an endless chain 2 wrapped around a paper discharge cylinder 19.
A grip cam 35 capable of opening the chain gripper 6 is mounted. The grip cam 35 is selectively provided at any one of an operating position where the chain gripper 6 is driven to open and a non-operating position where the chain gripper 6 is not driven. It can be set to. When the sheet 1 is received from the intermediate cylinder 17 (when the sheet 1 is extracted for quality inspection), the grip cam 35 is set to the operating position. Torso 17
To hold the sheet 1 sent from the printer. On the other hand, when the sheet 1 is not received from the intermediate cylinder 17, the grip cam 35 is set to the non-operation position, whereby the sheet 1 conveyed by the intermediate cylinder 17 passes through the paper discharge cylinder 19 and is discharged. Delivered to the torso 18.

The paper discharge cylinder 18 is provided with a gripper cam 36 for driving the chain gripper 6 of the endless chain 7 laid over the paper discharge drum 18. When the sheet 1 is received from the printer, the chain gripper 6 is driven to open at an appropriate timing to grip the sheet 1. Since the discharge cylinder 18 only needs to receive the sheet 1 conveyed through the discharge cylinder 19, the grip cam 36 is always in contact with the chain gripper 6.
Is fixed at the position for driving to open.

According to the print quality inspection system and the print quality control device as the second embodiment of the present invention, the print quality inspection and the print quality control are performed as follows. Hereinafter, description will be made with reference to FIG. First, the printed sheet 1
Is stacked on the discharge table 13 of the sheet stacking device 3 as a product. In this case, the discharge cylinder 1
7, the gripper changing cam 37a is in the non-operation position, and the gripper 37b
Is set to the operating position, and the holding cam 35 of the paper discharge cylinder 19 is set to the non-operating position. Thus, the sheet 1 transferred from the impression cylinder 15d of the printing device 22d to the intermediate cylinder 17 via the intermediate cylinder 16a is transferred to the paper discharge cylinder 18. When the paper is gripped by the chain gripper 6 of the endless chain 7 that rotates in synchronization with the paper discharge cylinder 18 and is transported to a position above the sheet stacking device 3, the paper release cam 9 disposed above the sheet stacking device 3 Is released from the chain gripper 6 and is stacked on the discharge table 13 of the lower sheet stacking device 3. Then, the sheets 1 stacked on the sheet discharge table 13 are carried out as a bundle by the same operation as in the related art.

Next, the case of extracting the sheet 1 for inspection will be described. In this case, while the sheet 1 passes through the intermediate cylinder 17, the gripper changing cam 37 a of the intermediate cylinder 17 is not shown in the drawing of the intermediate cylinder 17. The pawl device is moved to the operating position for driving the opening, and the holding cam 35 of the paper discharge cylinder 19 is moved to the operating position for driving the opening of the chain gripper 6. Thus, at an appropriate timing, the pawl device of the intermediate cylinder 17 opens the sheet 1 and simultaneously releases the sheet discharge cylinder 1.
The chain gripper 6 on the 9 side grips the sheet 1, and the sheet 1 is transferred from the intermediate cylinder 17 to the chain gripper 6 on the paper discharge cylinder 19 side.

The sheet 1 gripped by the chain gripper 6 moves integrally with the endless chain 20, and when the chain gripper 6 gripping the sheet 1 moves above the belt conveyor 4, the sheet is released by the paper release cam 11A. Then, the sheet 1 is opened. As a result, the sheet 1 held by the chain gripper 6 falls onto the belt conveyor 4. As shown in FIGS. 3A to 3C and FIG. 4, the sheet 1 is printed while being vacuum-adsorbed by the belt conveyor 4 while the front end is aligned by the paper contact 12, as in the first embodiment described above. The sheet is conveyed out of the machine 50 and then sent to the print quality inspection device 5 in the control room 32 via the sheet conveyance device 33a including the conveyance gripper 25 and the conveyance rail 26 and the guide 31. Then, a predetermined quality inspection is performed by the print quality inspection device 5 or visually, and based on the inspection result, each printing machine 5 is controlled via the control device 14.
Feedback control is performed on 0a, 50b, and 50c.

Therefore, according to the print quality inspection system and the print quality control apparatus of the present embodiment, the same effects as those of the first embodiment can be obtained. 3, there is an advantage that the total length of the device can be shortened as compared with the first embodiment. In the above-described embodiment, the belt conveyor 4 has one wide belt 4d (see FIGS. 3A to 3C), and the printing machine has a printing machine as shown by a solid line and a broken line in FIG. The sheet 1 is arranged to be conveyed in a direction perpendicular to the sheet conveying direction in the sheet discharge device 50 or the sheet discharge device 8a for inspection. As shown by a two-dot chain line in FIGS. The sheet 1 may be discharged in the same direction as the transport direction, or may be formed by a plurality of narrow belts 4a and 4b.

Next, a print quality inspection system and a print quality control device according to a third embodiment of the present invention will be described. FIG. 9 is a schematic side view illustrating the configuration of the paper discharge unit according to the present embodiment. In addition, FIGS. 1, 3 (a) to 3 (c), and FIG. 4 used in the above-described embodiments will also be described. Note that the same components as those described in the related art and the above embodiments are denoted by the same reference numerals, and description thereof will be omitted.

The print quality inspection system and the print quality control device of this embodiment are the same as those of the second embodiment described above, except that the inspection sheet ejection device (inspection sheet ejection device) 8
a (see FIG. 6) is modified, and only the inspection sheet discharging device 8b will be described below. As shown in FIG. 9, the inspection sheet discharge device 8 b according to the present embodiment is configured such that the endless chain 7 that conveys the sheet 1 from the discharge drum 18 to the sheet stacking device 3 of the discharge device 2 (sheet stack). The sheet 1 is received from the endless chain 7 (chain gripper 6) for quality inspection in a direction in which the sheet 3 travels from the apparatus 3 to the paper discharge cylinder 18 (downstream in the transport direction).

That is, the inspection sheet discharging device 8b is disposed in a closed space formed by the endless chain 7, has a vacuum suction function, and conveys the sheet in a direction perpendicular to the sheet conveying direction by the endless chain 7. And a paper release cam 11 a disposed above the belt conveyor 4. The paper release cam 11a is designed to open the chain gripper 6 when the chain gripper 6 gripping the sheet 1 moves, and the paper release cam 11a and the chain gripper 6
Thus, the extraction mechanism 11 'is formed. Thus, in the extraction mechanism 11 ′, the sheet 1 released from the chain gripper 6 falls on the belt conveyor 4 and is discharged to the outside of the printing press 50 by the belt conveyor 4. A paper contact 12 for aligning the position of the sheet 3 is provided on the side of the belt conveyor 4 on the side of the sheet conveying direction by the chain gripper 6 (right side in FIG. 9).

A sheet release cam 9a is provided above the sheet stacking device 3 in order to drop the sheet 1 onto the sheet stacking device 3. The sheet release cam 9a is connected to the chain gripper 6. Can be selectively set to one of an operation position for driving the opening of the printer 1 and a non-operation position for not driving the chain gripper 6. When the sheet 1 is to be extracted for print quality inspection, the inspection sheet is used. The non-operation position is set so as to feed the sheet 1 to the discharge device 8b.

Further, since the inspection sheet discharging device 8b is provided in the closed space formed by the endless chain 7,
Here, two paper discharge shafts (sprockets) 38a, 38
The travel path of the endless chain 7 is formed so that the size of the closed space is large enough to install the inspection sheet discharge device 8b using b. Of course, a configuration may be employed in which one closed discharge space is secured by using one discharge shaft having a diameter larger than those of the discharge shafts 38a and 38b.

According to the print quality inspection system and the print quality control device as the third embodiment of the present invention, the print quality inspection and the print quality control are performed as follows. Hereinafter, description will be made with reference to FIG. First, the printed sheet 1
In this case, the sheet release cam 9a above the sheet stacking device 3 is set to the operating position, whereby the chain gripper 6 is set. Is this paper release cam 9
a to open the sheet 1 above the sheet stacking device 3. Therefore, the sheet 1 gripped by the chain gripper 6 and conveyed from the paper discharge drum 18 falls onto the sheet stacking device 3.

Next, the case of extracting the sheet 1 for inspection will be described. In this case, the paper release cam 9a above the sheet stacking device 3 is set to the non-operation position (the paper release cam 9a is released). As a result, the chain gripper 6
Since the opening drive is not performed above the sheet stacking device 3, the sheet 1 passes through the sheet stacking device 3 while holding the sheet 1. When the chain gripper 6 moves to the belt conveyor 4, it is opened and driven by the paper release cam 11 a to release the sheet 1, and the sheet 1 falls on the belt conveyor 4, and the leading edge position is aligned by the paper contact 12 at this time. Can be Thereafter, the sheet 1 is sent to the print quality inspection device 5 (paper inspection table 30) in the control room 32 by the belt conveyor 4 or the like (see FIGS. 1, 3 and 4). Then, the print quality inspection device 5
Alternatively, a predetermined quality inspection is performed visually, and based on the inspection result, each of the printing presses 50a and 50
b and 50c are feedback-controlled.

Therefore, according to the print quality inspection system and the print quality control device of the present embodiment, it is simpler than the second embodiment (see FIG. 6) in which the transport paths of the sheets 1 using the chain grippers 6 are provided in parallel. With such a configuration, there is an advantage that an effect similar to that of the second embodiment can be obtained. The print quality inspection system and the print quality control device of the sheet-fed printing press according to the present invention are not limited to the above-described embodiments.

For example, in each of the embodiments described above, the color tone, which is a parameter relating to print quality, is controlled. For example, a register shift is inspected by the print quality inspection device 5 and based on the inspection result, By the control device 14,
The feed speed of the sheet 1 of each of the printing presses 50a, 50b, and 50c may be feedback-controlled. Also,
The operator may manually operate the control device 14 based on the inspection result of the print quality inspection device 5 to perform such feedback control. In this case, a display device for displaying the detection result on the print quality inspection device 5 may be provided.

In each of the above-described embodiments, a vacuum is supplied to the suction holes 28 of the belt conveyor 4. However, the suction holes 28 only need to be able to suck the sheet 1. Alternatively, a negative pressure (a pressure lower than the atmospheric pressure) may be supplied.

[0076]

As described above in detail, according to the printing quality inspection system for a sheet-fed printing press according to the first aspect of the present invention, the sheet for the printing quality inspection is extracted and the printing quality inspection system is used. Since the transfer of the sheet to the print quality inspection unit can be performed without manual operation, there is an advantage that the manual operation in an unfavorable environment such as the vicinity of the sheet printing press can be eliminated. .

Further, since the inspection sheet ejection device for ejecting the sheet for the print quality inspection is provided separately from the normal sheet ejection device for ejecting the sheet at the normal time, the sheet ejection is performed. When the paper is extracted for print quality inspection, this extraction operation can perform print quality inspection without causing stains, scratches, etc. on the printing surface of the sheet normally discharged as a product by the sheet discharge device. Thus, there is an advantage that the print quality can be improved. In addition, since the extraction operation is performed by the inspection sheet discharging device, the printing surface of the print quality inspection sheet is not stained or scratched as compared with a case where an operator manually performs the extraction operation. There is an advantage that a print quality inspection can be performed with high accuracy.

According to the print quality inspection system for a sheet-fed printing press according to the second aspect of the present invention, the sheet-ejecting device for inspection is
3. The sheet according to claim 1, which is provided on the upstream side in the sheet transport direction of the sheet discharge device in the sheet printing press, and has a simple configuration that is almost the same as the configuration of the conventional apparatus. There is an advantage that the same effect as the print quality inspection system of the printing press can be obtained.

According to the print quality inspection system of the sheet-fed printing press according to the third aspect of the present invention, the sheet-transferring device transfers the sheet discharged by the sheet-ejecting device for inspection to the sheet-fed printing press. A sheet transport device that transports the sheet delivered by the sheet transport device to the quality inspection section, and a sheet transported by the sheet transport device. Since the guide is configured to guide the sheet to a predetermined location in the quality inspection unit, there is an advantage that the transfer path can be appropriately set according to the surrounding space conditions and the like.

According to the printing quality inspection system for a sheet-fed printing press according to the present invention, the inspection sheet discharging apparatus is provided with:
It is composed of an extraction mechanism for extracting sheets from the sheet-fed printing press, and a belt conveyor for receiving the sheets extracted by the extraction mechanism, and the belt conveyor is also used as a sheet unloading device. There is an advantage that the sheet extracted from the leaf printing press can be reliably transferred to the sheet transport device in a stable state placed on a belt conveyor.

According to the print quality control apparatus for a sheet-fed printing press according to the present invention, the control apparatus includes:
The feedback control of the control element relating to the print quality of the sheet-fed printing press is performed based on the detection information from the print quality inspection system of the sheet-fed printing press according to any one of the above-mentioned items. In addition to the effects of the print quality inspection system of the sheet-fed printing press described in the section, there is an advantage that the print quality can be effectively improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an overall configuration of a print quality inspection system and a print quality control device according to a first embodiment of the present invention.

FIGS. 2A and 2B are schematic diagrams illustrating a configuration of a paper discharge unit according to the first embodiment of the present invention, wherein FIG. 2A is a plan view and FIG.

FIG. 3 is a schematic diagram showing a configuration of an inspection sheet ejection device (inspection sheet ejection device) and a sheet transport device (C section in FIG. 2) according to the first embodiment of the present invention; (A) is a sectional view according to a front view (the paper release cam 11 is omitted),
(B) is a plan view, and (c) is a cross-sectional view according to a side view.

FIG. 4 is a schematic side view showing a configuration of a sheet transporting device and a guide (E portion in FIG. 1) according to the first embodiment of the present invention.

FIG. 5 is a schematic plan view showing a configuration of a modified example of the belt conveyor (sheet-feeding device) according to the first embodiment of the present invention.

FIG. 6 is a schematic side view illustrating a configuration of a paper discharge unit according to a second embodiment of the present invention.

FIG. 7 is a schematic plan view illustrating a configuration of a main part of a paper discharge unit according to a second embodiment of the invention.

FIG. 8 is a schematic side sectional view showing a configuration of a belt conveyor (sheet-sheet unloading device) according to a second embodiment of the present invention, and corresponds to a sectional view taken along line FF of FIG. 7; FIG.

FIG. 9 is a schematic side view illustrating a configuration of a paper discharge unit according to a third embodiment of the present invention.

FIG. 10 is a schematic diagram showing the overall configuration of a conventional print quality inspection system and print quality control device for a sheet-fed printing press.

FIG. 11 is a schematic side view illustrating a configuration of a main part of a conventional sheet-fed printing press.

FIG. 12 is a schematic side view showing a configuration of a paper discharge unit of a conventional sheet-fed printing press (note that a paper receiving plate 10b is omitted).

FIG. 13 is a schematic side view illustrating a configuration of a main part of a paper discharge unit of a conventional sheet-fed printing press.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sheet (sheet) 2 Discharge part 2a Sheet transport part 3 Sheet stacking device (normal sheet discharge device) 4 Belt conveyor (sheet discharge device) 4a, 4b, 4d Belt 4c Roll 5 Print quality inspection Apparatus 6 Chain gripper 7, 20 Endless chain (chain) 8, 8a, 8c Inspection sheet ejection device (Inspection sheet ejection device) 9, 9a, 11A, 11a Paper release cam, gripper opening / closing cam 10, 10d Paper Contact 11, 11 'Extraction mechanism 12 Paper contact 13 Discharge table 13e Pallet 14 Control device, controller 15, 15a to 15d Impression cylinder 16, 16a, 17 Intermediate cylinder 18, 19 Discharge cylinder 21 Paper supply unit 22 Printing unit 22a To 22d printing device 24 paper feed table 25 transport gripper 26 transport rail 26a stopper 27 vacuum box 28 suction hole 29 Suction tube 30 Paper inspection table (predetermined location) 31 Guide 32 Control room (Print quality inspection section) 33 Sheet transport device 33a Sheet transport device 34 Drive chain 35, 36 Gripper cam 37a, 37b Gripper change cam 38, 38a-38c Discharge shaft, sprocket 50, 50a, 50b, 50c Printing machine (sheet-fed printing machine) 52a-52d Plate cylinder 53a-53d Blanket cylinder

Claims (5)

[Claims] 1. A printing quality inspection system for a sheet-fed printing press for taking out a sheet printed by a sheet-fed printing press from the sheet-fed printing press and inspecting print quality. A sheet discharging device for inspection, which is provided separately from a normal sheet discharging device for discharging paper, and which extracts a part of the sheets and discharges them for a print quality inspection; A quality inspection unit that inspects the print quality of the sheet discharged by the sheet discharge device; and the sheet discharged by the inspection sheet discharge device.
A printing quality inspection system for a sheet-fed printing press, comprising a sheet transport device for transporting the sheet to the quality inspection unit. 2. The apparatus according to claim 1, wherein the inspection sheet ejection device is provided upstream of the normal sheet ejection device in the sheet printing press in the sheet conveyance direction. A print quality inspection system for a sheet-fed printing press according to claim 1. 3. A sheet discharge device for discharging the sheet discharged by the inspection sheet discharge device to the outside of the sheet printing press, wherein the sheet transfer device includes: A sheet transporting device for transporting the sheet unloaded by the paper unloading device to the quality inspection unit, and a sheet transported by the sheet transporting device to the quality inspection unit. The print quality inspection system for a sheet-fed printing press according to claim 1, further comprising: a guide for guiding to a location. 4. An inspection sheet discharging apparatus, comprising: an extraction mechanism for extracting the sheet from the sheet printing press; and a belt conveyor for receiving the sheet extracted by the extraction mechanism. The printing quality inspection system for a sheet-fed printing press according to any one of claims 1 to 3, wherein the belt conveyor is also used as the sheet-sheet unloading device. 5. A sheet quality printing system for a sheet-fed printing press according to claim 1, further comprising a control device for controlling said sheet-fed printing press. A print quality control device for a sheet-fed printing press, wherein the control device performs feedback control of a control element relating to print quality of the sheet-fed printing press based on detection information from the print quality inspection system.