JPH11151804A - Residual sheet detector of sheet-feed rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the stabilization printing quality, the reduction of an operator's load and the improvement in productivity. SOLUTION: Three residual sheet detectors 30 for detecting residual sheets are mounted on a transportation board installed between a feed part and a printing unit. When residual sheets are detected by the detectors 30, the turning-on operation of a product switch 40 to reopen printing is made invalid so that the operation of a printing machine 1 and a feeder 51 is not reopened. Besides, the detection of the residual sheets by the detectors 30 turns on a residual sheet lamp 39 to inform the residual sheet to an operator. The lamp 39 is turned off when the operator removes the residual sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remaining sheet detecting apparatus for detecting remaining sheets of paper generated on a transport board provided between a sheet feeding unit and a printing unit of a sheet-fed rotary printing press. is there.

[0002]

2. Description of the Related Art In general, a printing operation is performed on a proof print or a printed original or the like, and after the required quality is confirmed by trial printing, the printing operation proceeds to a final printing operation. The trial printing is repeated until quality consistency is confirmed. Further, in order to maintain the quality of printing even after the final printing operation, various operations such as a blanket cleaning operation are performed as needed. As described above, the final printing operation is performed while repeatedly interrupting and resuming the printing, and accordingly, the sheet feeding is also performed while repeatedly interrupting and resuming the printing. For this reason, a state in which the fed sheet remains on the transport board, that is, a so-called remaining sheet frequently occurs.

[0003]

Since the remaining paper is not fed at a normal timing, a positional deviation or a paper curl has occurred. For this reason, if the sheet feeding operation is restarted with the remaining sheets left undisturbed, paper breakage at the register portion and mixing of broken pieces into the printing unit portion occur. In order to remove the mixed paper pieces, it was necessary to perform unnecessary cleaning work on blankets, ink rollers, water supply rollers, and the like.

Further, if the paper is transported between the printing units in a folded state, the blanket or each part of the machine may be damaged, or the paper may be involved in an ink roller or the like. Further, wasteful time associated with such accident occurrence processing increases, leading to a decrease in productivity and quality. Heretofore, as a task of checking the remaining paper, the operator himself has been visually performing the work before starting the paper feeding work, so that the burden on the operator is heavy.

A first object of the present invention is to provide an apparatus for detecting a remaining sheet of a sheet-fed rotary printing press which prevents an accident caused by the occurrence of a remaining sheet and maintains a stable print quality. A second object of the present invention is to provide an apparatus for detecting a remaining sheet of a sheet-fed rotary printing press, which improves waste productivity by reducing wasteful working time and expenses caused by occurrence of an accident caused by the remaining sheet. is there. A third object of the present invention is to provide an apparatus for detecting a remaining sheet of a sheet-fed rotary printing press, which eliminates various operations involved in checking the remaining sheet and handling an accident, thereby reducing the burden on the operator.

[0006]

To achieve the above object, the present invention provides a switch for setting a printing machine to a printing operation mode, a remaining sheet detecting means for detecting a remaining sheet on a conveying path, And control means for preventing the setting of the printing operation mode by the switch means when the remaining paper is detected by the remaining paper detection means. According to the invention,
If there is remaining paper on the transport path, the setting of the printing operation mode by the switch means is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view schematically showing a sheet-fed rotary printing press according to an embodiment of the present invention. In FIG. 1, a sheet-fed rotary printing press generally indicated by reference numeral 1 includes a sheet feeding unit 2 that sucks and feeds stacked sheets 5 one by one by a sucker device (not shown), and a sheet feeding unit 2. And a printing unit 3 that prints the paper 5 fed from the paper feeding unit 2 via the transport board 6 by aligning the top, bottom, left and right of the paper 5 with the contact unit 7. And a paper discharge unit 4 that discharges and stacks the paper 5 printed by the printing unit 3. Reference numeral 8 denotes a paper feed control panel that is disposed near the paper feed device 2 and that performs operations for performing various tests on various parts of the printing press 1.

The transfer board 6 is formed in a rectangular plate shape.
As shown in FIG. 1, both ends are supported by front and rear frames 11 and 12, and are installed in a slightly inclined state. A plurality of transport tapes 13 are arranged on the transport board 6 at predetermined intervals in a direction orthogonal to the paper transport direction A, and a plurality of rollers 1 are provided.
It is stretched between 4,15,16,17. Reference numeral 18 denotes a paper feed roller that contacts the roller 15 and captures the paper 5 sucked by the sucker device (not shown) between the roller 15 and the paper 5. The paper 5 captured by the rollers 15 and 18 is in a continuous multi-feed state in which the leading end of the succeeding paper 5 is superimposed on the trailing end of the preceding paper 5 as shown by a two-dot chain line in FIG. It is sent out onto the transport board 6 and transported by the transport tape 13.

In FIG. 2, reference numeral 20 denotes a difference plate which constitutes a register 7 for aligning the top and bottom of the conveyed sheet 5 with the left and right. Reference numeral 21 denotes a swing device for holding the sheet 5 sent onto the difference plate 20 and holding the sheet 5 with the claw of the impression cylinder 22. Above the transport board 6, a pair of transport board frames 24 is provided in the paper transport direction A, and the transport board frames 24
As indicated by the solid line and the two-dot chain line, the bracket 25 is pivotally supported by the bracket 25 so as to be freely rotatable.

A paper feed roller 26 is supported by a support bar (not shown) suspended on the transport board frame 24 via a leaf spring (not shown) and a bracket 27. The paper feed roller 26 is disposed in contact with the transport tape 13 on the transport board 6, and transports the paper 5 in cooperation with the transport tape 13. Reference numeral 28 denotes a control box attached to the back side of the transport board 6, and a control unit 52 (see FIG.
See).

Reference numeral 30 denotes a remaining paper detecting device for detecting the remaining paper on the transport board 6 by a light reflection or light transmission method, and has a minimum length in the paper transport direction A along the paper transport direction A on the transport board 6. Three sheets are provided at intervals smaller than the sheet 5. As shown in FIG. 4, the remaining sheet detection device 30 includes a detection sensor 36 attached to the back surface of the transfer board 6 via the support plate 32 such that the front end faces a small hole 6 a formed in the transfer board 6. It has.

In the remaining sheet detecting device 30 shown in FIG. 4, the support plate 32 is attached to the rear surface of the transfer board 6 by screws 34 via spacers 33. Remaining paper detection device 3
A screw portion is formed on the outer periphery of the zero sensor body 35 and is screwed into the screw hole 32 a of the support plate 32. Sensor body 35
Is rotated to adjust the height of the detection sensor 36, and is fixed to the support plate 32 by the nut 37 after the adjustment.

FIG. 5 shows an operation panel 3 provided on the paper discharge unit 4.
8 is shown. The operation panel 38 has a remaining sheet lamp 39 for displaying that there is a remaining sheet, and ON / OFF of the operation of the printing press 1.
A product switch 40, various control switches, and a lamp for repeatedly instructing OFF, that is, interruption and restart of printing by the printing press 1, are provided. The remaining sheet lamp 39 is turned on when the remaining sheet detecting device 30 detects the remaining sheet on the transfer board 6, and is turned off when the operator removes the remaining sheet on the transfer board 6.

The product switch 40 is composed of an automatic reset type push button switch, and has a switch state (ON).
/ OFF state) by turning on / off the switch lamp 40
a (FIG. 7). The switch lamp 40a is repeatedly turned on and off in response to the ON / OFF operation of the product switch 40, and is controlled to be turned off while being turned on by detecting remaining paper.

FIG. 6 shows a select switch 41 provided on the paper feed control panel 8, and turns on / off the detecting operation of the remaining sheet detecting device 30. The selector switch 41 is turned on when a normal printing operation is performed and the detection of remaining paper is required, and is turned off when performing various tests and maintenance of each unit of the printing press 1 different from the normal printing operation.

FIG. 7 is a block diagram schematically showing the sheet-fed rotary printing press shown in FIG. In FIG. 7, reference numeral 50 denotes a control device including a CPU (Central Processing Unit) for controlling a printing operation.
An operation panel 38 having a remaining sheet lamp 39 and a product switch 40, a sheet feeding device 51 including the sheet feeding unit 2, a sucker device (not shown), and the like, and a remaining sheet detection control unit 52 are connected. The product switch 40
As described above, the switch lamp 40a indicating the ON / OFF state of the switch is added.

The remaining sheet detection control unit 52 includes a remaining sheet detection device 3.
0 and the select switch 41 on the paper feed control panel 8 are connected. The remaining sheet detection control unit 52 includes the remaining sheet detecting device 30.
When a remaining paper detection signal is input from the control unit 50, a signal indicating the presence of remaining paper is sent to the control device 50. When a signal indicating the presence of remaining paper is input, control device 50 does not resume operation even if product switch 40 for instructing operation of printing press 1 is turned ON by an operator. Further, the switch lamp 40a of the product switch 40 is lit (O
In the case of (N state), the light is turned off and the restoration control to the OFF state is performed.

On the other hand, when the select switch 41 is turned off, the remaining sheet detection control section 52 turns off the remaining sheet detecting device 30.
The state is controlled (disabled state). Therefore, when the product switch 40 is turned ON in this state, the remaining sheet detection device 30 is inactive regardless of the presence or absence of the remaining sheet, so that the printing press 1 can be operated. Thus, various tests can be performed even if there is residual paper on the transport board 6.

Although the remaining sheet detecting device 30 is controlled to be in the OFF state when the select switch 41 is OFF, the remaining sheet detecting device 30 can be detected without controlling the remaining sheet detecting device 30. Of course, the signal may be ignored and the signal indicating the remaining sheet may not be sent to the control device 50.

Next, the operation of detecting the remaining sheet in the sheet-fed rotary printing press having the above-mentioned configuration will be described with reference to the flowchart of FIG.

When the test printing or the final printing operation is started,
The sheets 5 stacked on the sheet feeding unit 2 are sucked by a sucker device (not shown), separated one by one, and fed. The paper 5 fed from the paper feed unit 2 is caught between the rollers 15 and the paper feed rollers 18 and sent out onto the transport board 6,
The paper is transported on the transport board 6 by the transport tape 13 and the paper feed roller 26. After the conveyed sheet 5 is aligned top and bottom and left and right by the register unit 7 on the difference plate 20, the sheet end is added by the swing device 21. The paper 5 having the paper edge added thereto is replaced by the nail of the impression cylinder 22 and printed by the printing unit 3, then discharged to the paper discharge unit 4 and stacked.

When the trial printing or the final printing is interrupted, a signal indicating the end of the printing operation is sent from the control device 50 to the remaining sheet detection control section 52, and the remaining sheet detecting device 30 is controlled to the ON state. Next, when the product switch 40 is turned on to restart test printing or final printing (step S1), the switch lamp 40a is turned on (step S2), and based on the output of the remaining sheet detection device 30. The detection of remaining paper on the transport board 6 is performed (step S3). The remaining sheet detection control unit 52 determines the presence or absence of a remaining sheet based on the output of the remaining sheet detecting device 30 (step S4). When there is a remaining sheet 5A (see FIG. 3), the control unit 50 indicates the presence of the remaining sheet. Send a signal.

Next, the control device 50 turns on the remaining sheet lamp 39 on the operation panel 38 (step S5), and notifies the operator of the presence of the remaining sheet. At the same time, the product switch 40 returns to the OFF state (step S6).
At this time, the switch lamp 40a is turned off (step S
7). Thereafter, the operator notices that the remaining paper lamp 39 is turned on, and the board frame 24 and the roller 26 are opened to release the remaining paper 5.
When A is removed (step S8), the remaining sheet detection control unit 52
Turns off the remaining paper lamp 39 based on the output of the remaining paper detection device 30 (no remaining paper) (step S9). As a result, the printing press 1 returns to a state where normal printing work can be performed.

Here, even if the operator starts the operation without noticing the lighting of the residual sheet lamp 39, the operation of the printing press 1 and the paper feeder 51 is not restarted unless the residual sheet 5A is removed. . That is, the operation of the printing press 1 shown in step S8 to be described later and the feeder operation from the sheet feeding unit 2 shown in steps S12 to S14 are stopped and controlled.

After confirming that the remaining paper lamp 39 is turned off in step S9, the operator turns the product switch 40 on again. When ON of the product switch 40 is detected in step S1, the switch lamp 4
0a is turned on (step S2), and the remaining paper is detected based on the output of the remaining paper detecting device 30 (step S3).

When it is confirmed in step S4 that there is no remaining paper, the remaining paper detection control unit 52 controls the remaining paper detection device 30 to an OFF state (step S10). Next, after the operation of the printing press 1 is started (step S1).
1), paper feed preparation is started (step S12). That is, after the feeder pump is turned on (step S1).
3) The feeder valve is opened (step S14),
The paper feeding operation is started (step S15). Thereby, in the paper feeding device 51, the paper 5 is fed one by one onto the transport board 6 by the paper suction operation of the sucker device (not shown),
Printing work is started (step S16).

Thereafter, when the printing operation is completed (step S17), the sheet feeding operation by the sheet feeding device 51 is stopped (step S18), and the remaining sheet detecting device 30 is controlled to the ON state (enabled state) (step S19). ), And terminate the process.

According to the present embodiment, when printing is resumed, the ON operation of the product switch 40 is invalidated by the remaining sheet detection output of the remaining sheet detecting device 30. If there is paper, the operation of the printing press 1 and the paper feeding device 51 is not restarted, and the paper breakage, blanket damage, machine damage,
It prevents the occurrence of accidents such as inflow of paper and entanglement of the ink roller, and stabilizes print quality.

Further, the work of visually checking the remaining paper, which has been conventionally performed by the operator, becomes unnecessary, and the burden on the operator is reduced by greatly reducing the processing work associated with the accident. Further, since the useless work time due to the interruption and restart of the sheet feeding is reduced, the productivity is improved. Further, since the remaining sheet lamp 39 is provided, the operator can be notified of the remaining sheet, and when the remaining sheet is removed, the light is turned off and the removal can be confirmed, thereby improving the workability. Further, by providing the select switch 41, various tests of each part of the machine can be performed separately from a normal printing operation, so that usability is improved.

In the above embodiment, when the remaining paper is detected, the product switch 40 is returned from the ON state (the switch lamp 40a is turned on) to the OFF state (the switch lamp 40a is turned off). The setting of the print operation mode by the product switch 40 may be prevented.

In the above embodiment, the operation of the printing press 1 and the paper feeder 51 is started when no remaining paper is detected. However, when the product switch 40 is turned on, the operation of the printing press 1 is started. May be started, and when no remaining sheet is detected, the sheet feeding operation of the sheet feeding device 51 may be started.

In the above embodiment, the remaining sheet detection control section 52 is provided, but the remaining sheet detection control section 52 is omitted, and the remaining sheet detection device 30 and the select switch 41 are controlled by the control device 5.
0 may be directly connected. Further, in the above embodiment, the notification is made by lighting the display with the remaining sheet lamp 39, but a sounding means such as a buzzer may be used. In the above embodiment, the remaining sheet detecting device 30 is turned on in step S19, but the remaining sheet detecting device 30 may be turned on between steps S1 to S3.

[0033]

As apparent from the above description, according to the present invention, the print quality is stabilized and the productivity is improved. In addition, the burden on the operator is reduced, and workability is improved. Further, the usability of the printing machine is improved.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a sheet-fed rotary printing press according to an embodiment of the present invention.

FIG. 2 is a side view of a transport board portion of the sheet-fed rotary printing press shown in FIG.

FIG. 3 is a plan view of a transfer board part shown in FIG. 2;

4 is an enlarged sectional view of a mounting structure of the remaining sheet detecting device shown in FIG.

FIG. 5 is an enlarged front view of the operation panel shown in FIG.

FIG. 6 is a front view of a select switch provided in the sheet-fed printing press shown in FIG.

FIG. 7 is a block diagram schematically showing the sheet-fed rotary printing press shown in FIG.

FIG. 8 is a flowchart illustrating a remaining sheet detecting operation of the sheet-fed printing press shown in FIGS. 1 and 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... sheet-fed rotary printing machine, 2 ... paper feed part, 3 ... printing unit,
4 paper discharge unit, 5 printing paper, 6 transport board, 8 paper feed control panel, 30 remaining paper detection device, 38 operation panel, 39
... Remaining paper lamp, 40 ... Product switch, 40a ...
Switch lamps, 41: select switch, 50: control device, 51: paper feeder, 52: remaining paper detection control unit.

Claims (3)

[Claims] 1. A printing machine for performing a printing operation, a paper feeding device for feeding paper for printing to the printing machine, and a transport path for transporting the paper fed from the paper feeding device to the printing machine. A sheet detecting device for a sheet-fed rotary printing press, comprising: switch means for setting the printing press to a printing operation mode; remaining sheet detecting means for detecting remaining sheet on the transport path; Control means for preventing the setting of the printing operation mode by the switch means when the remaining paper is detected by the means. 2. The remaining sheet detection of a sheet-fed rotary printing press according to claim 1, further comprising a notifying means for notifying the presence of the remaining sheet when the remaining sheet detecting means detects the remaining sheet. apparatus. 3. The apparatus according to claim 1, further comprising a select switch for turning on / off a remaining sheet detecting operation of said remaining sheet detecting means, wherein said control means controls said select switch to be turned off.
A remaining sheet detecting device for a sheet-fed rotary printing press, wherein the remaining sheet detecting means is controlled to be in an OFF state when the condition is F.