JPH0211425B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sheet-fed printing machine such as an offset printing machine that automatically removes defective printed books that occur when paper feeding is temporarily stopped and restarted during printing operation. The present invention relates to a device that enables manual separation.

In a sheet-fed printing press, especially a multi-color offset printing press, the finished state of printing becomes stable after several sheets have been printed after the start of operation.

Therefore, with such a printing press, after the start of operation, printed books with poor print quality are often obtained for a while. It is standard practice to extract a specified number of sheets, for example 15 to 20 sheets, from a printed sheet. Therefore, when printing starts, the operator waits in the delivery department for the first time. He was working on extracting the printed copies of the book.

Additionally, this also applies when paper feeding is temporarily stopped during printing and then paper feeding is restarted, so it is necessary to perform the above-mentioned extraction operation each time paper feeding is temporarily stopped. Therefore, it is desirable to operate such a printing press as continuously as possible.

However, in such printing machines, it is unavoidable to temporarily stop feeding paper due to the occurrence of double-sheet feeding in the paper feeding section, and therefore, conventionally, each time paper feeding is interrupted, However, there was a drawback that sampling work was required by an operator or the like.

An object of the present invention is to eliminate the drawbacks of the prior art described above, and eliminate the need to remove printed books each time the printing press temporarily interrupts paper feeding during operation. To provide an automatic tape insertion device capable of performing extraction work according to the situation.

In order to achieve this object, the present invention provides a method for detecting a paper feed from the point in time when a paper feed stop signal is generated when the printing press stops feeding until immediately before the last printed book is ejected to the delivery section. a first control signal that causes the tape insertion means to operate the tape feeding operation after a first set time representing the time elapses; and a paper feeding start signal of the printing machine that is generated when the printing machine starts feeding paper. a second control signal that causes the tape insertion means to perform a tape cutting operation after a second set time representing a time period until at least one printed book is ejected; a third control signal that causes the tape insertion means to perform a tape feeding operation after a third set time representing the time from the start of paper feeding of the machine until just before a normal printed book is ejected to the delivery section; a fourth time period representing the time from the generation of the start signal until at least one printed book is ejected after the third set time elapses;
A control circuit is provided that generates a fourth control signal that causes the tape insertion means to operate the tape cutting operation after a set time has elapsed, and thereby detects a period during which the paper feed to the printing machine in operation is stopped and separates the tape for weaving. It is characterized in that it is automatically inserted and left between the stacked layers of printed books stored in the delivery section.

Embodiments of an automatic tape insertion device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a four-color printing press to which an embodiment of the present invention is applied, which includes a paper feed section 10, a printing section 20, and a delivery section 30, 12 a chain mechanism, 1
4 is a paper feed unit hopper, 15 is a paper stacking table, 16 is a vacuum suction type paper feeder, 18 is a feeder board, 2
2 is a paper feed swing, 24 is a delivery cylinder, 32 is a chain conveyor, 34 is a delivery section hopper, 36 is a paper stacking table, 38 is a tape insertion machine, A is a printing machine, and B
is a printed paper, that is, a printed book.

The printing paper A stored in the hopper 14 of the paper feeding section 10 is sequentially taken out one by one onto the feeder board 18 by the paper feeding device 16, and delivered one by one to the delivery cylinder 24 via the swing 22. The paper is fed one by one and sent to the printing section 20. At this time, hoppa 1
4 are sequentially moved upward by the chain mechanism 12 so that the top paper of the stacked printing papers A can be easily taken out onto the feeder board 18 by the paper feeding device 16.

In this way, the printing paper fed one by one to the printing section 20 undergoes a predetermined printing process there, and then is taken out one by one from the printing section 20 by the chain conveyor 32 and placed in the hopper 34 of the delivery section 30. The sheets are sequentially stacked and stored on the paper stacking stand 36 located at .

FIG. 2 shows an embodiment of the tape insertion machine 38, 41
is a motor, 42 is a roller, 43 is a tape guide,
44 is a solenoid, 45 is a link mechanism, 46 is a cutter, 47 is a case, and 48 is a tape insertion slot. Note that C represents tape.

A motor 41 drives a roller 42 and a guide 43.
The tape C inserted from is sent out in the direction of the arrow.

The solenoid 44 operates a cutter 46 via a link mechanism 45 to cut the tape C sent out by the roller 42.

At this time, when the tape C is sent out by the roller 42, in order to prevent it from hanging down, the surface of the roller 42 that contacts the tape C is made into a curved surface, so that the tape C is curved in the width direction. The tape C is fed out in a curved manner, thereby ensuring that the tape C is fed out to the top surface of the printed book B. Further, the tape C is generally a colored paper tape so that it can be clearly distinguished from the print B.

Next, the operation of the tape inserter 38 in the delivery section 30 will be explained with reference to FIGS. 3 to 6.

These FIGS. 3 to 6 are partially extracted views of the delivery section 30 in FIG. 1, and show the operation of the tape inserter 38 at different timings.

First, FIG. 3 shows that while the printing press is in operation, paper feeding is stopped at time T ₀ due to an occurrence of two-sheet insertion, etc., and at that time, the printed copy B' of the printing paper fed last is the printed copy of the delivery unit 30. After the time (first set time) from when the tape is conveyed to the top of tape B by the chain conveyor 32 to just before being discharged to the delivery section 30, the motor 41 of the tape insertion machine 38 is activated at time _T1 . This figure shows a state in which the tape C has been fed out to the top surface of the printed book B'.

Next, FIG. 4 shows the time after which the paper feeding operation resumes at time T ₂ and the time (second set time) has elapsed until one to several printed sheets are stacked on top of the printed sheet B'. At time _T3 , the solenoid 44 of the tape insertion machine 38 is activated, and the tape C is cut off by the cutter 46. Between this time T ₂ and T ₃ , 1 to 1 are stacked on top of the printed book B' with the tape C sandwiched between them.
Let m be the number of printed copies.

Next, in FIG. 5, after tape C is inserted at time _T3 as shown in FIG. The time from when the (n+1)th print B″ is stacked up and the tape C is sandwiched until just before the (n+1)th print B″ is conveyed from the printing unit 20 to the delivery unit 30 by the belt conveyor 32 (the third set time ), at time T ₄ , the motor 4 of the tape inserter 38
1 is operated and tape C is fed out.

FIG. 6 shows the time from when tape C' is sent out at time T ₄ as shown in FIG.
The solenoid 44 of the tape insertion machine 38 operates at time _T4 after the set time of
The state in which tape C' is separated is shown.

Thus, according to an embodiment of the present invention, each time the paper feeding operation is temporarily stopped and resumed during operation of the printing press, the tape inserter 38 is operated as shown in FIGS.
The series of operations shown in the figure is carried out, and after paper feeding is resumed, two tapes C and C' are inserted and left between the layers of stacked copies B, sandwiching the prescribed n copies.

Therefore, according to this embodiment, even if the paper feeding operation is temporarily stopped due to an occurrence of two sheets being inserted during operation of the printing press, the operator etc. can perform the work of removing the printed books each time. There is no need to carry out the extraction operation, and the extraction operation can be carried out at a time using the inserted tapes C and C' at an appropriate time, such as later or after printing is completed.

Further, in this embodiment, after feeding out the tapes C, C', etc., the cutter 46 is not immediately operated by the solenoid 44 to cut the tapes, but the cutter 46 is cut on top of the fed out tapes C, C'. Separation is performed after the sheets are stacked. Therefore, the weaving tapes C and C' are securely held between the stacks of printed books B, and there is no fear that they will fall off during cutting or be blown away by the wind.

Next, FIG. 7 shows an embodiment of a control circuit for causing the series of operations of the tape insertion machine 38 shown in FIGS. 3 to 6 to be performed when the paper feeding operation to the printing machine is stopped and restarted.

In FIG. 7, 51 is the feeder section 10 (first
52 is an input to which a signal is supplied when the paper feeding operation is restarted, 53 is an input to which a signal is supplied when the paper feeding operation is stopped, and 53 is the printing unit
Inputs 54 to 56 are buffer amplifiers to which timing pulses obtained each time the plate cylinder rotates at a predetermined rotational position of the plate cylinder in FIG. 1 are supplied;
57 and 58 are shift registers each having a predetermined number of stages; 59 and 60 are OR gates; 61;
62 is a timer circuit consisting of a monostable multivibrator with time constants γ ₁ and γ ₂ , respectively; 63 is an output of a drive signal to the solenoid 44 of the tape inserter 38; and 64 is an output of a drive signal to the motor 41.

The entire shift register 57 is (l+m
+n) stage shift register, middle (l+m)
The shift register 58 is configured so that outputs are also taken out from the stage and the (l+n) stage, and the entire shift register 58 has l stages. Note that the numerical value l will be described later.

Next, the operation of the circuit shown in FIG. 7 will be explained with reference to the timing chain shown in FIG.

The paper feed operation for the printing machine currently in operation is
Suppose you stop at To.

As a result, a paper feed stop signal is supplied to the input 52, so that a signal b is input to the shift register 58.

On the other hand, the timing pulse from the input 53 is input to the shift pulse input ShP of the shift registers 57 and 58.
Since TP is supplied, l timing pulses TP are input to the shift register 58 from time _T0 .
At time T ₁ when the signal is supplied to ShP, a signal X ₁ (first control signal) appears at the l output of the shift register 58, passes through the OR gate 60, becomes the signal X, and a drive signal is sent to the motor 41 via the timer circuit 62. It is given only from time T ₁ to time γ ₁ .

Here, several stages l of the shift register 58 are the first
In the figure, printing paper A fed from the paper feed unit 10
The timing pulse TP is generated during a time period equal to the time required for the printing process to pass through the printing unit 20 and reach the top of the printed book B in the delivery unit 30.
Set it to be the same as the number of.

Therefore, a signal is sent to the l output of the shift register 58.
X ₁ appears, which becomes signal X and motor 41
At time _T1 when the tape C is fed out by driving, the tape C is immediately placed on top of the printed copy B' of the last sheet fed to the printing unit 20 at the time To when the sheet feeding stopped. , the operation shown in FIG. 3 will be performed. The timer circuit 62 is provided to provide the time γ ₁ necessary for the motor 41 to feed out the tape C by a predetermined length.

Next, assume that the paper feeding operation is restarted at time _T2 .

As a result, a restart signal is supplied to the input 51 at time T ₂ , so that the signal a is input to the shift register 57 . This input signal a is sequentially shifted by the timing pulses TP supplied to the shift pulse input ShP of the shift register 57, and at time _T3 when (l+m) timing pulses TP are supplied, (l+m ) a signal Y ₂ (second control signal) appears at the output. this signal
_Y2 passes through the OR gate 59 and becomes the signal Y, and a drive signal is given to the solenoid 44 via the timer circuit 61, so the cutter 46 operates at time _T3 and cuts off the tape C as shown in FIG. . In other words, at time T ₂ , paper feeding is restarted, and when l timing pulses TP are supplied to the shift register 57, the first printed image after paper feeding is resumed is placed on the printed book B' in FIG. A time point T ₃ when a book is introduced and then m timing pulses TP are supplied
In this case, m sheets of printed books are placed on tape C, and at that time, tape C is cut with cutter 56.
is separated, so the operation shown in FIG. 4 is performed. As already explained,
The timing pulse TP is generated when the printing section 20 and the plate cylinder are 1
One timing pulse TP appears every time the paper rotates, and therefore, every time one sheet of paper is printed, a timing pulse TP appears.Therefore, (l+m) timing pulses were supplied after paper feeding resumed at time _T2 . time
At T ₃ , m sheets of printed books are placed on tape C. Further, the timer circuit 61 is provided to supply a drive signal for the time γ ₂ necessary for the solenoid 44 to operate the cutter 46 .

Now, even after time T ₃ , the shift register 57
Inside, the signal a continues to be shifted by the timing pulse TP, and eventually the timing pulse
At time T ₄ when (l+n) TPs are supplied, a signal X ₂ (third control signal) appears at the (l+n) output. This signal X ₂ passes through the OR gate 60 to become the signal X, and the drive signal is again supplied to the motor 41 via the timer circuit 62 . As a result, the tape C' is fed out from the tape insertion machine 38, and the operation shown in FIG. 5 is performed.

After that, the point in time when (l+m+n) timing pulses TP are supplied to the shift register 57
When T ₅ is reached, the signal Y ₁ (fourth control signal) appears at the (l+m+n) output, passes through the OR gate 59, becomes the signal Y, and is applied as a drive signal to the solenoid 44 via the timer circuit 61, so that the time T At step ₅ , the operations shown in FIG. 6 are performed, and the series of operations is performed accurately.

Therefore, by using the control circuit shown in FIG. 7, it is possible to ensure the operation of the tape inserter 38 when stopping and restarting the sheet feeding operation shown in FIGS. 3 to 6. can.

By the way, in the above embodiment, when the paper feeding operation is stopped, the state is as shown in FIG. 3 until the paper feeding is restarted. The tape C is inserted onto the printed copy B' made of paper, so that even when a subsequent extraction operation is performed, this printed copy B' remains without being extracted.

However, in a precision printing machine such as a multi-color offset printing machine, very good results are often not obtained for printing the printed book B' using the last paper fed when paper feeding is stopped.

An embodiment in which this printed book B' can also be taken out is shown in FIGS. 9 and 10.

These FIGS. 9 and 10 correspond to FIG. 3 of the already explained embodiment, and at time _T1 , the printed book B' is brought to the delivery section 30 and placed on the printed book B. This was chosen just before the event. For this purpose, for example, the stage l of the shift register 58 of the control circuit shown in FIG.
All you have to do is reduce it.

As a result, in this embodiment, from time T ₁ until time T ₂ , the tape C is inserted under the last printed book B' as shown in FIG. 10, and the extraction operation is performed. Occasionally, this printed book B' is also removed, and the printed book that is insufficiently finished due to paper feeding being stopped and restarted can be completely removed.

As explained above, according to the present invention, whenever the paper feeding operation is temporarily stopped or restarted while the printing press is running, a weaving tape is automatically inserted between the stacked layers of printed books. Since it is inserted and left behind, you can easily know the location of printed books that have stopped feeding or are in insufficient printing condition due to reunion even after printing is completed, and can be removed all at once when necessary. Therefore, it is possible to provide an automatic tape insertion device that eliminates the drawbacks of the prior art and eliminates the need for an operator to remove the tape each time the paper feeding operation is stopped and restarted.

[Brief explanation of drawings]

FIG. 1 is a side view of a printing press to which an embodiment of the present invention is applied, FIG. 2 is a perspective view showing an example of a tape insertion machine used in an embodiment of the present invention, and FIG.
6 to 6 are schematic diagrams for explaining the operation of one embodiment of the present invention, FIG. 7 is a circuit block diagram showing one embodiment of the control device in the present invention, and FIG. 8 is a schematic diagram for explaining the operation. The time charts, FIGS. 9 and 10 are schematic diagrams for explaining the operation of other embodiments of the present invention. 10... Paper feeding section, 20... Printing section, 30... Delivery section, 32... Chain conveyor, 38...
Tape insertion machine, 54-56... Input interface, 57, 58... Shift register, 59, 6
0...OR gate, 61,62...timer circuit,
A...Printing paper, B, B', B''...printed book, C,
C'...tape.

Claims (1)

[Scope of Claims] 1. It has a function of sending out a tape of a predetermined length and a function of cutting the sent out tape, and has an identification mark between the stacked layers of printed books discharged to the delivery unit after the printing process. In a printing machine equipped with a tape insertion means for inserting and leaving a tape, the last printed copy after the printing machine stops feeding starts from the time when a paper feed stop signal is generated when the printing machine stops feeding. a first control signal that causes the tape insertion means to operate to feed the tape after a first set time representing the time immediately before the tape is ejected to the delivery section; and a first control signal that causes the tape to be fed when the printing machine starts feeding the paper. a second control signal that causes the tape insertion means to perform a tape cutting operation after a second set time representing the time from the time when the signal is generated until at least one printed book is ejected after the start of paper feeding of the printing press; The tape insertion means is operated to feed the tape after a third set time representing the time from the time when the paper feed start signal is generated until just before a normal printed book is ejected to the delivery section after the printing machine starts feeding the paper. a third control signal; and the tape insertion means after a fourth set time representing the time from the generation of the paper feed start signal until at least one printed book is ejected after the third set time has elapsed. An automatic tape insertion device comprising: a control circuit that generates a fourth control signal for causing a tape cutting operation. 2. Claim 1 is characterized in that the first set time is configured to be a time from when the printing press stops feeding to immediately after the last printed book is discharged to the delivery section. automatic tape insertion device.