JPS6087163A - Irregular folding sensing device - Google Patents

Abstract

PURPOSE:To find irregularly folded sheet for a book in early stage, stabilize the quality and reduce the number of damaged sheets by comparing the sensing signal given by a beam switch for sensing the leading edge of each folded sheet with the judgement gate signal given by another beam switch for sensing the side edge of the trailing part. CONSTITUTION:A beam switch 10 for sensing the leading edge of a folded sheet for a book is installed inside a pair of front supports, on the right and left, for location of the leading edge of each sheet, while another beam switch 11 for sensing the side edge of the trailing part is furnished at the trailing edge of the sheet within a zone of sheet which is in contact with the front support at the rear outer side of the former named beam switch 10, and the sensing signal given by the beam switch 10 to inform if there is contact is compared with a judgement gate signal given by the other beam switch 11, the result whereof shall serve for judging whether thereis contact on both sides of said front supports, on the right and left, at the leading edge of the sheet. This provides possibility of judging if the continued time for sensing is long or short, to assure early finding of any irregularly folded sheet, stabilization of the quality and reduction of the number of damaged sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a υi defect inspection device for inspecting folding defects and folding accuracy of signatures folded to a predetermined size by a chopper folding machine installed at the rear of the folding machine of a rotary press. It is.

The rotary printing press is equipped with an in-line triangular plate, rotary folding machine, and chopper folding machine for printing on a roll of paper and then folding it into the specified form (size, negative number, folding strength). A normal folding machine.

Depending on the size of the printing press, it can be roughly divided into A size series and 13 size series, each with 11! It is now possible to create such a fold. A machine is adjusted so that each sheet is folded at a predetermined position, but due to poor paper tension, changes in printing press speed, etc., some signatures may not be folded at the correct predetermined position.

Therefore, the printing operator must inspect each signature as it is output. However, it is not always the case that defective signatures occur continuously, and they may not be detected immediately, making it difficult to prevent paper loss. h'- comes out and loses 1 hour.

The purpose of the present invention is to detect folding defects early, stabilize quality, and reduce paper waste by in-line inspecting the folding accuracy of a chopper folding machine installed at the rear of the folding machine of a rotary press printing machine. It is something to do.

Here, an example of a folding machine will be shown and its function will be explained according to FIG. The printed paper ipl is.

The paper is folded in half in the flow direction by a triangular plate (5) and a nip roller (16). and rotor IJ
- Folding machine insertion barrel (1η, call side +181, delivery side 09)
It is introduced into the folding body section consisting of. Plug-in barrel (1 needle has 2 needles)
3) is placed.

Insert the needle C23) into the front end of the two-fold paper fp), wrap it around the insertion cylinder aD side -♂ Pa in the direction of the arrow, and rotate it by the specified rotation angle.
The insertion blade (20) located on the insertion barrel (1η) and the calling side (
The signature is folded at a predetermined folding position by the folding action of the jaw (21) located at 181, and the signature is conveyed to the call side (18) with the folded part held in the jaw (2I). be done.

At that time, when it rotates by a predetermined rotation angle, the cutting blade (24) located on the call side (18) and the cradle 1 of the insertion barrel (17)
25) Cut to predetermined length using K. After that, when it rotates by a predetermined rotation angle, the calling side f1.81 and the delivery side (19
) transfers the signature (pl) held by the calling side (181) to the delivery side (claw 2 located at I!!).Then, it is transferred to the conveyor belt (5) of the chopper folding machine. At the timing when it should be introduced, the pawl (22) releases the signature (pi) from its grip.It hits the front stopper (4) of the chopper folding machine while being sandwiched by the conveyor belt (5) of the chopper folding machine, and the paper In order to fold the signature (p) parallel to the flow of the paper, two opposing nip rolls (3) are folded by the chopper blade (2).
) and folded into predetermined signatures (p), the signatures are received one by one by the lower impeller [12+ and placed on the lower conveyor belt 3). Due to this movement, the signatures are continuously produced by the folding machine.

The problem here is the cause of defective signatures folded by the chopper folding machine with misaligned folding positions, but the first cause is the relationship between the jaw (21) and the insert blade @). The second cause is when the 2D is not gripped parallel to the mouth, and the third cause is when the 2D is bent during the transfer between the 2D and the claw (22). When the knife bends, the fourth cause is when it hits the front pad (4) and bends due to the reaction.As shown in Figure 1, the front pad (4) of the chopper folding machine ), the signature (pl) does not contact correctly and is introduced bent as shown by the broken line and is folded, or the chopper blade (2) is not folded correctly along the crease line, resulting in a folding error. .

The present invention helps printing operators avoid the occurrence of folded signatures in chopper folding machines due to the above-mentioned causes.

By notifying through a buzzer or the like, the occurrence of defective signatures can be detected early.

The present invention is applied to a chopper folding machine connected to the rear of the folding machine of a single rotary press printing machine, and detects the right and left front ends of the signatures that come into contact with the front cover for signature position setting.

A plurality of beam switches for detecting the front end of the lower girder, and either one of the beam switches at both ends of the beam switch is located in the signature area corresponding to the rear outer front end of the beam switch, on the side that detects the side edge of the signature. A beam switch is provided for detecting the edge, and a beam switch for detecting the front edge detects whether or not the front end of the signature is in contact with both the left and right sides.

The folding apparatus is characterized in that a judgment gate signal is emitted by a side edge detection beam switch, and a comparator is manually operated to judge whether or not the leading edge of the signature is in contact with both left and right sides, thereby detecting the occurrence of a bend in chopper folding. A detection signal indicating the presence or absence of contact obtained by a beam switch for detecting the front end of the signature in the defect inspection device.

It is characterized in that it determines whether or not the front end of the signature is in contact with both left and right sides of the front end by comparing and determining the continuous output timing with the determination gate signal obtained by the rear edge detection beam switch.

The apparatus of the present invention will be explained in detail below with reference to the drawings.

Fig. 2: The folded signature (pl) is placed between the upper belt (5) and the lower belt f5)' and is placed on the chopper table (p) from the output table. 4). As an embodiment of the present invention, a beam switch (10) is installed at each of the left and right front plates (4) and the inner edge for positioning the front end of the sixth signature, and is located at the rear end of the signature and attached to the front plate (4). Installed left and right beam switch (IOA).

(iob) Beam switch full in the signature area that abuts the front rest of the rear outer mtl (indicated by diagonal lines) on either side.
is installed. Beam switch OIJ is a signature (p)
is in contact with the front cover (4) and is located slightly inside the rear end of the signature, and the beam is blocked by the signature (p), resulting in an OFF' state. One period during which the beam switch OD is in the OFF state corresponds to an inspection period for one signature. The beam switch (10) is held by a holder (4Y) fixed to the front cover (4), and the hold edge of the signature (pi) is in contact with the front cover (4). Figure 6 is a plan view of the device of the present invention, in which beam switches (1) are installed on the left and right front plates (4), respectively.
0a), (1ob) are held, and the signature (pi is the front cover (
The beam is blocked only when it is in contact with the front cover (4), and if the signature (pi) moves away from the front cover (4) even a little, the beam switches (10a) and (10b) are set so that the beam passes through.
) h” is installed.The beam switch (marked is the signature) (beam switch (10a) in the direction perpendicular to the progress of
, (1ob) and is usually a beam switch (1Oa).

It is arranged so that it becomes ON and Of"I" before (10b).

The operation of the device of the present invention will be explained according to the control system block diagram in FIG. 4. The beam switch (Ill.

(10a), (101)) are ON and OFI'' output states 7174 depending on whether or not the beam is reflected or passed, respectively.
t,) formed.

As output signals, a determination gate signal S and detection signals Sa and Sb for the right and left front ends of the folded sheets in contact with the front cover are generated, respectively. to counter (28) and 13 counter c! 9), the rotary encoder t of the pulse generator is used to measure and count the time that the signature [pl is in contact with the front cover (4)].
Count the pulses CK generated from the rotary press unit;
) and B counter 129) are automatically reset when the gate signals Ga and Gb from the timing controller (26) to the beam switches (10a) and (10b) change from ON to OFF.

The test is performed for the number of pulses of Ta%Tb during the time when Ga and Gb are output, and the respective count values Ta and Tb are input to the test determination device (30). In the timing controller (26), each transmission type beam switch detects the signature, and the signals S and Sa are both 012F.
When , signal Ga is output, and both S and sb are OFF.
The signal Gb is output when . In addition, the timing controller (26) is activated after the signal S turns from OFF to ON, that is, after the gate signals Ga and Gb have finished and both the A counter (28) and the B counter (29) have stopped counting.
A judgment start signal J is issued to notify the timing of judgment, and when the signal J is sent, Ga, Gb are
Both are continuously output, and Karan t-Ta, Tb
is input to the determiner (30), it is determined that the left and right front ends of the signature tplO are correctly in contact with the front cover, and the operation signal E is not transmitted, and both or one of Ga and Gb is input. is not continuously output until the timing immediately before the signal J is sent, it is determined that the front end of either the left or right side of the signature [pl] is not in proper contact with the front cover, and the operation signal E is sent to confirm that the product is good. Sorting device or alarm indicator 6
1).

In this manner, the apparatus of the present invention not only detects whether the front contact of the signature is normal or abnormal based on the ON, 01"l" state of the detection signal of the left and right beam switches, but also detects the detection duration of the detection signal. The merits and demerits can be determined by inspection. For example, a determination start signal J that informs the determination timing.
When signal J is transmitted, Ga and Gb are continuously output until just before the signal J is transmitted, Ta, Tl) are input to the judger (30), and if the times Ta and Tb represented by each are sufficiently long, the signature ( It is determined that the left and right front ends of pi are in proper contact with the front pad, and the operation signal E is not transmitted.
If both Gb or either one is not continuously output until the timing immediately before the signal J is sent, the signature detection signal OF
Since the count is automatically reset by F and re-counted, Ta and/or Tb will take a very short time, and the front end of the signature (pl) will not be in proper contact with the front end. When it is determined that there is no such thing, an operation signal E is sent to operate the non-defective sorting device or the alarm indicator Sυ.

The inspection device of the present invention can detect defective folding of signatures folded by the chopper folding machine installed at the rear of the folding machine of a rotary press printing machine, and only detects the presence or absence of detection signals from the left and right beam switches installed at the front. Not.

It is possible to determine the length of the duration of the detection signal, and even if the signature is in correct contact at the moment of contact with the front cover, it will be bent due to the bounce immediately thereafter.

Even if they do not touch each other correctly, the situation can be accurately detected in-line, reducing paper waste, preventing defective signatures from being mixed in, etc.
It is also possible to sort defective signatures.

This has a remarkable effect on stabilizing the quality of printed signatures.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a chopper folding machine, Fig. 2 is a side view of a rotary press folding machine part and a chopper folding machine part to which a device of the present invention is attached, and Fig. 6 is a chopper folding machine to which a device of the present invention is attached. Fig. 4 is a block diagram of the operating system of the device of the present invention;
FIG. 5 is a time chart for one apparatus of the present invention. Patent applicant Toppan Printing Co., Ltd.

Claims (1)

[Scope of Claims] 1) In a chopper folding machine that is connected to the rear of the folding machine of a rotary printing press, a plurality of folds are installed at the left and right front ends of the signatures that come into contact with the signature position setting front stopper. A front edge detection beam switch and a side edge detection beam that detects the side edge of a signature in a signature area that contacts the rear outer front cover of either one of the beam switches at both ends of the beam switch. A switch is provided, and a beam switch for detecting the front end detects whether or not the front end of the signature is in contact with both left and right sides of the front end, 1141
The folding apparatus is characterized in that a judgment gate signal is emitted by a beam switch for detecting one end, and the signal is inputted to a comparison judger to judge whether or not the leading edge of the signature is in contact with both left and right sides, thereby detecting the occurrence of a bend in chopper folding. Defect inspection equipment. 2) Comparing and determining the continuous output timing of the contact presence/absence detection signal obtained by the beam switch for detecting the front edge of the signature and the determination gate signal obtained by the beam switch for detecting the rear edge of the signature, 2. The folding defect inspection device according to claim 1, wherein the folding defect inspection device determines whether or not the front end is in contact with both left and right sides of the front end.