JPH0361262A - Paper discharging device for folding machine - Google Patents

Abstract

PURPOSE:To prevent the generation of following troubles such as paper jam around a group of folding drums, a chopper part, and the like by cutting and discharging the delivery starting edge of a web and the following defective part at the initial time of paper passing performed prior to printing work. CONSTITUTION:A paper discharging device for holding machine is provided with a paper cutter 7 for cutting a web W running at a web path between a former 1 and a group of folding drums 6, and pairs of rollers 3, 4, which are at least one nipping means for holding the web. The unstable part of the web in the mechanical disposal such as the disordered cut end in the starting edge of the web at the time of paper passing and the following defective part W1 are cut by the paper cutter 7, and the cut part is discharged to the side part of the web path by the advancing/receding action of a paper guide 8 to the web path, preventing the cut part from being guided to the group of folding drums. Paper passing work can be therefore performed efficiently and safely with a simple device.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a web that is threaded and introduced into a folding machine of a rotary press, particularly a web-type rotary press, before entering the folding drum group. The present invention relates to a paper ejecting device of a folding machine that cuts irregular portions and subsequent defective portions and ejects the cut sheets.

[Conventional technology]

The folding machine of the web-type rotary press is designed as shown in Fig. 2, and folds the web W that has passed through the printing section (not shown) in the width direction.
A folding former 1, a pair of forming rollers 2 disposed downstream of the former 1, a pair of first and second nipping rollers 3 and 4, a guide roller 5, and a group of folding drums 6
No countermeasures have been taken to deal with unstable processing of the web W, such as irregular portions at the starting end that have passed through the printing section and defective portions that follow.

[Problem to be solved by the invention]

In a web-type rotary press, the web W that has passed through the printing section is first folded in half (first fold) in the width direction by a former 1, then guided to a folding cylinder group 6, and held by web holding means (for example, needles). It is held and guided along the folding cylinder 6a and
At the same time as the fold is made, the web W is cut to create a signature, and depending on the case, a third fold is further made in the chopper folding section.

By the way, in the paper threading performed at the start of printing, guiding the starting end of the web W to the folding cylinder group is performed by the former 1.
This is done by an operator guiding the web W with both hands between a pair of forming rollers 2 located downstream of the forming roller 2, but at this time, the starting end of the web W is not necessarily neat and flat. This is because the web is cut by hand when guiding the web on the upstream side of former 1, and the current situation is that it is almost never in an orderly and flat state. It is not possible to guide the running paper that is continuously running from the paper feed section.

In addition, when threading the paper, the tension of the web W traveling a long distance from the paper feed section is not stable, and the first fold may not be properly aligned due to expansion and contraction in the vertical direction, meandering or deviation in the left and right directions, etc. A defective first folding portion (not shown) may occur at a position that is significantly deviated from the first folding position. .

Therefore, when such a web W is guided to the folding drum group 6,
Holding by the web holding means tends to be incomplete;
Even if the displacement along the folding drum 6a is completed, there may be a delay in the middle, and even if the displacement along the folding drum 6a is completed and the second fold is made, the resulting signature will not be a complete one. This results in an irregular signature that does not form a single signature, or a defective signature whose width is different from the regular signature.
Paper jams have sometimes occurred between each cylinder, and further downstream at the chopper folding section where chopper folding, commonly referred to as third folding, is performed. If such paper jams are ignored and the rotary press continues to operate, serious trouble will occur in web-type high-speed rotary presses, such as subsequent signatures getting wrapped around the folding drum group, resulting in long hours of operation. This could lead to problems such as the machine being forced to stop. Therefore, the operator manually removes unstable paper such as the starting end of the web W and the first folding defective portion following this, which is extremely dangerous.

The present invention has been developed in consideration of the above-mentioned problems, and is designed to cut and eject web portions that are unstable due to mechanical processing, such as the starting end of the web and subsequent defective portions, at the beginning of paper threading prior to printing work. It is an object of the present invention to provide a paper ejecting device for a folding machine that allows paper folding operations to be performed during subsequent operations without causing any trouble.

[Means to solve the problem]

In order to achieve the above object, the paper discharging device of the folding machine according to the present invention includes a paper cutter for cutting the running web and at least one nipping device for sandwiching the web in the web path between the former and the group of folding drums. and a paper guide for discharging the paper cut by the paper cutter to the side of the web path.

[For production]

Parts of the web that are unstable due to mechanical processing, such as parts where the starting end of the web to be threaded through is not neatly cut and subsequent defective parts, are cut with a paper cutter, and these cut parts are used for the operation of the paper guide. It is discharged to the side of the web path and is not guided to the folding drum group.

〔Example〕

An embodiment of the present invention will be described based on FIG.

In this embodiment, the same members as those of the conventional example shown in FIG. 2 are denoted by the same reference numerals, and the explanation thereof will be omitted.

For example, a pair of first and second nipping rollers 3.4, which are two nipping means, are provided along the web path between the former 1 and the folding cylinder group 6, and the width of the web W passing therebetween is A large-sized paper cutter 7 is installed so that it can move forward and backward. Further, a paper guide 8 is attached to the downstream side of the pair of second nipping rollers 4 on the downstream side so that it can move forward and backward with respect to the web path using a fluid pressure cylinder, a solenoid, or the like. 10 is guard.

In the above configuration, the web W running from upstream of the former 1 is manually guided between the forming roller pair 2. If this continues, the starting end of the web W in an unstable state and the following defective portion W will be guided to the folding drum group 6. Therefore, to prevent this portion from going to the normal web path, the folding drum group 6 is At the upstream side, the paper guide 8 is previously reversed to the position shown by the solid line, that is, to a state where it blocks the web path, and then a manual button on a control panel (not shown) is pressed to gently feed the web W downward. As the starting end of the web W passes through the second pair of nipping rollers 4 and further descends, it deviates from the web path to the side according to the paper guide 8 and is guided to the packet 9 provided on the side. be done.

Then, when the tension of the web W is held between the pair of first and second nipping rollers 3.4 and there is no slack in the vertical direction, and the web W is in a stable state with no meandering or deviation in the horizontal direction, the paper cutter 7, this gently running web W is neatly cut into a flat state in the width direction. The cutting leading edge and the following defective portion W1 are guided by the paper guide 8 and discharged into the packet 9 on the side of the web path. When the paper guide 8 is returned to its original position in synchronization with this operation, the web W whose tip has been neatly and flatly cut by the paper cutter 7 passes through the regular web path to the folding drum group 6 on the downstream side. The web W2 is held by a web holding means (not shown) provided on the folding cylinder 6a, for example, a plurality of needles, and reliable operation is possible. From this state,
Gradually increase the rotation speed of the printing press to shift to high-speed operation.

It should be noted that, in the embodiment described above, it is easy to understand that when a means for nipping the web W is provided upstream of the former 1, the pair of first nipping rollers 3 is not indispensable. Further, the paper cutter 7 and the nipping means may be provided together (not shown), and the nipping means may be operated in conjunction with the operation of the paper cutter 7.

Further, the paper cutter is not limited to one with a reciprocating mechanism as shown in FIG. 1, but may also have a mechanism such as a rotary cutter. That is, the present invention is not limited to the embodiments described above, but includes design modifications that do not depart from the scope of the claims.

〔Effect of the invention〕

According to the present invention, at the beginning of paper threading prior to the printing operation, the feeding start end of the web W and the subsequent defective portion of the web that is unstable due to mechanical processing are cut and discharged, so that during the subsequent operation, In particular, it is possible to eliminate lost time such as machine stoppages due to troubles such as paper jams in the vicinity of the folding drum group that performs the second folding, and furthermore, in a portion of the chopper downstream thereof that performs the third folding. Furthermore, even though it was a slow operation, while the rotary press was in operation, the operator was previously exposed to a very dangerous situation in which he had to manually remove unstable paper just after it started threading, but with the device of the present invention, According to this method, it can be easily processed mechanically by pushing a button or the like, so it is very effective in terms of safety measures. Furthermore, the device itself has a simple structure, can be easily added to a conventional device, does not require high equipment costs, and can perform paper threading work safely and reliably.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the web path downstream from the former according to the present invention and its device arrangement, and FIG. 2 is an explanatory diagram showing a conventional example thereof. 1 is a former, 2 is a pair of forming rollers, 3.4 is a pair of nipping rollers, 6 is a group of folding cylinders, 7 is a paper cutter, 8 is a paper guide, 9
is a packet.

Claims (1)

[Claims] A paper cutter for cutting the running web and at least one nipping means for clamping the web are disposed in the web path between the former and the folding cylinder group, and the cut paper cut by the paper cutter is directed to the side of the web path. A paper ejection device for a folding machine, characterized in that it is equipped with a paper guide for ejecting paper.