JPS6087164A - Irregular folding sensing device - Google Patents

Abstract

PURPOSE:To have early finding of irregularly folded sheet for a book, stabilization of the quality and reduction of the amount of waste sheets by checking the attitude of each sheet, which is transported on a chopper table of a chopper folding machine installed behind the folding unit in a rotary press, when the sheet passes the front support parts. CONSTITUTION:Beam switches 10a, 10b are mounted on each of the retainers 9 fixed to a pair of front supports 4, on the right and left, and a gate signal generator 25 is installed to signal for a set allowable period of time from the time when these beam switches 10a, 10b have sensed first the leading edge, and a judgement device 29 is furnished to compare the time difference Tc the sheet concerned P passing respective beam switches 10a, 10b, which is measured while said gate signal G has been emitted, with the allowable reference time, so as to check the attitude of the sheet P at the front support parts. This provides accurate inspection of the folded condition of the sheet P in the state of ''in line'', which assures early finding of irregular folding, stabilizing of the quality and reduction of the amount of waste sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for inspecting the accuracy and folding defects of signatures folded into a predetermined size by a par folding machine.

The rotary press has an in-line folding machine such as a triangular plate, rotary folding machine, chopper folding machine, etc. to print on the web and then fold it into the specified form (size, negative number, folding strength). is set up.

Ordinary folding machines can be roughly divided into A-size series and B-size series according to the size of the printing press, and each type of folding machine can produce several types of signatures. As if each is folded at a predetermined position,
Although the machine is adjusted, some signatures may not be folded in the correct position due to paper tension/wrongness, changes in printing press speed, etc. Therefore, the printing operator needs to inspect each ejected signature each time.

However, it is not always the case that defective signatures occur continuously, and it may not be possible to detect them immediately.If a defective signature is discovered, it becomes necessary to go uphill to inspect the signatures from a long time ago, which results in a loss of time. , paper loss occurred.

The present invention aims to detect folding defects early, stabilize quality, and reduce paper waste by automatically inspecting the folding accuracy of a chopper folding machine installed at the rear of the folding machine of a rotary printing press using inline/inline technology. The purpose is to

Here, to give an example of a conventional folding machine, the printed paper (P) shown in Figure 2 is folded in two directions in the paper flow direction by the folding machine triangular plate (14) and nip roll (15) of a rotary printing press.
Folded in half. And the insertion cylinder of the rotary folding machine (16)
, a call side (17), and a delivery drum (18). The insertion cylinder (6) is equipped with a needle (19), which inserts the DI ff) into the tip of the folded paper ψ).
an insert blade (20) disposed on the insert barrel (16) side;
The folded portion is held in the mouth (21) disposed on the calling side (17) and is conveyed as a signature (F') to the calling side (17). At that time, when it rotates by a predetermined rotation angle, the cutting blade (22) located on the calling side (17)
) and the pedestal (23) to cut it to a predetermined length. After that, when the call side (17) and the delivery barrel (18) are rotated by a predetermined rotation angle, the signature (P) held by the call side (17) is displayed.
is placed on the delivery drum (18) and held in the claw (24). After that, the conveyor belt of the chopper folding machine (5) %
(At the timing when it should be introduced into 55, the claw (28) is inserted into the signature (
The a-signature (I)) to be released from the conveyor belt (5) and (5) comes into contact with the front stopper (4) of the chopper folding machine, and the signature (P) ) is pushed between two opposing nip rolls (15) by the chopper blade (2) in order to fold it parallel to the flow, and after creating a prescribed signature, the impeller (11) lowers the conveyor bell) one by one. (12) Place it on top.

Through such movements, signatures (P) are finally continuously produced by the chopper folding machine. The resulting signature is a normal signature folded in the correct position and is placed in the mouth (21).
and the nail (24). If the folding drum bends the folding drum, the first possibility is that it hits the front cover (4) and bends due to the reaction. Place the front cover of the chopper folding machine (4
) It is necessary for the signature Φ) to come into correct contact with the chopper grade (2), but for example, as shown by the broken line, the signature Φ) may be introduced crookedly against the chopper grade (2) due to the reasons mentioned above, or otherwise. Since the chopper blade (2) and the front cover (4) are not perpendicular to each other, the chopper blade (2) cannot be folded into the folding plate correctly, resulting in folding errors.

The present invention makes it possible to detect folding defects early by notifying the printing operator of the occurrence of folding abnormalities and signatures caused by the above-mentioned folding machine using a buzzer, lamp, etc. It is something.

The present invention is characterized in that in a folding machine connected to the rear of a folding machine of a rotary press, a pair of left and right beam switch notches are installed in parallel in front of a front end for positioning the front end of the signature, for each fold to be conveyed. A comparator that compares the time difference between the left and right beam switches of the front end of the folding sheet and sends a signal, and the folding machine cycle time starts from the time when the front end of the folding sheet is first detected by the beam switch on either the left or right side. a gate signal transmitter that transmits a determination gate signal G until a predetermined time; a pulse generator and a counter that convert signals from the comparator and the gate signal generator into pulses and measure them; and a transmission count value Tc of the signal. The display signal E is determined by determining whether it is larger or smaller than the reference value T.
This folding sorting device is characterized by being equipped with a judgment device that transmits a signal and operates a display, and is equipped with a gate signal generator that emits a set allowable time from the time when the front end is first detected by a beam switch. A signature sorting device or a buzzer lamp is provided with a determining device that compares Tc measured while the gate signal G is being transmitted with an allowable reference time, and operates when Tc is determined to be longer than the allowable reference time. It is equipped with an indicator such as

The present invention will be explained in more detail with reference to the drawings. As shown in Figure 2, the folded signature ψ) is conveyed from the paper ejection table onto the chopper table, sandwiched between the upper belt (5) and the lower belt (5a), and is placed on the front plate. (4).This is to detect whether the paper and edge (front end of the signature) of the present invention have passed at the same time or within a permissible time difference.FIG. This is a plan view, in which beam switches (ioa) (10b) are held at equal distances in front of the front cover (4) by holders (9) fixed to (4) in the left and right drawings, and the signature (P ) is the prefix (4
) is installed so that the beam is blocked when it is in contact with the beam.

The operation of the inspection apparatus of the present invention will be explained according to the fourth operation system block diagram.

It is normal if the signature (P) being conveyed through the chopper table (1) passes through the beam switches (10a) and (10b) at the same time, and the signature (P) passes through the beam switch (10a) and (10b) at the same time.
10a), (10b)? If they pass with a time difference, the front end of the signature Φ) is folded in an obliquely bent position, and it is determined that the fold is defective.

If the time difference is within a certain tolerance, it can be determined to be normal. However, if the difference in passing time between the front edges of the signature is greater than the tolerance, the signature can be determined to be defective due to the front end (4). This is because this is considered to be the range in which the curvature of (p) is completely corrected.

The signature (P) is connected to the beam switch (10a), (10b
) at the same time, check whether the beam switch (10
a), (10b) output signals, Sa and Sb, respectively
It can be determined by whether the signal states of S4 and S4 match.For example, Sa and Sb are in a low voltage state when the signature (P) is blocking the light from the beam switch. High voltage when not in use
It becomes a gh state. The signature (P) is the beam switch (10
a).

(10b) When k does not pass at the same time, Sa, S
b does not go from High to Low at the same time. Beam switch (10a).

(10b) signal Sa, Sb k comparator (26)
compares and outputs a high signal to the counter (28) when the generation times of Sa and Sb are different, and when the signal (2B) comes, the clock generator (27)
? A clock pulse CKQ is counted according to the rotation period of the folding machine generated by the rotary encoder, and the time difference Tc when the signature (p) passes through the beam switches (10a) and (101)) is measured. Therefore, the time difference Tc (T
A determiner (29) in FIG. 4 is provided to determine whether or not c+, TC2, . . . ) is an allowable value within the set reference count value T0. Gate signal generator (25)
When the front end of the signature ω) first passes either the beam switch (10a) or (10b), a gate signal is sent to the determiner (29), and the gate signal G is Low.
Output the signal to the counter (28) ↓.

Then, the gate signal G is output for a time Tg, and during this time the comparator (26) outputs a signal corresponding to the generation time difference Tc of the front edge detection signals Sa, , Sb.

Figure 5 shows the beam switch f (10n) (
10b) output signals Sa, Sb and the gate signal generator (
It is a time chart diagram of the signal by the gate signal G1 comparator (23) according to '25), and when measuring the time difference Tc, the time difference is calculated from the time when either signal Sa or sb first transmits LOW. The gate signal G is transmitted for a Tg waiting time within one machine rotation cycle time, and therefore, the signal G stops transmitting just before the signals S to sb become High again. The gate signal G is output to a counter (28), and when the counter (28) receives the signal, it outputs a clock pulse from a rotary engine (27) that emits a clock signal according to the rotation period of the folding machine. C.K.
is counted, and the count/count number of T'C is inputted to the determiner (29) in FIG. 4, and the magnitude of TC with respect to the count value - of the allowable reference signal T corresponding to the rotational speed of the folding machine is determined. Tc
If ≦T, it is determined that the front end of the signature is in correct contact with the left and right sides of the front cover, and if Tc>To, it is determined that the signature is not in contact with the right and left sides, and a signal E is output, and a buzzer and an alarm are activated. The inspection device of the present invention operates an indicator (30) such as a bar or a non-defective sorting device. By checking the posture of the front cover, it is possible to predict the occurrence of folding errors, detect the point at which the front edge of the signature passes the beam switch, and detect when the rear edge of the signature or the left and right ends pass the beam switch. This system is designed so that it does not detect when the folded signature is folded, making it possible to accurately inspect the pre-folded signature in-line, reducing the amount of waste paper, sorting defective signatures, and converting defective signatures into correct signatures. early detection of contamination is possible,
It has a remarkable effect on stabilizing the quality of printed signatures and reducing paper waste.

[Brief explanation of drawings]

Fig. 1 is a plan view illustrating the normal position of the signatures introduced into the chopper folding machine, and Fig. 2 is a side view of the inspection device of the present invention installed in the chopper folding machine connected to the rear of the rotary press folding machine. 3 is a plan view of the device of the present invention installed in a chopper folding machine, FIG. 4 is a block diagram of the operation system of the device of the present invention, and FIG. 5 is an operation time chart of the device of the present invention. Patent applicant Toppan Printing Co., Ltd.

Claims (1)

[Claims] In the chopper folding machine connected to the rear of the rotary press folding machine, the needle passes through a pair of left and right beam switches parallel to the front of the front plate that positions the lower front end of the needle, and each beam switch on the left and right of the lower front end of each needle being conveyed. A comparator that transmits a signal by comparing the time difference between the two, and a comparator that transmits a signal G from the time when the lower front end of the needle is first detected by either the left or right beam switch and transmits a determination gate signal G until a predetermined time within the folding machine cycle time. A gate signal generator, a pulse generator that converts and measures signals from the comparator and the gate signal generator into pulses, and determines the magnitude of the transmission count value Tc of the signal and a set reference value T. A folding defect inspection device characterized by being provided with a determining device for transmitting a display signal E and operating a display device.