JP2003086394A - Static electricity eliminator and folding section stacking apparatus making use of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a static electricity eliminator which can control a dust- collecting effect to easily conduct maintenance of cleaning or the like and an installation work, and a folding section stacking apparatus making use of the same. SOLUTION: For the static electricity eliminator comprising an electrode part for generation of corona discharge and nozzles 230 for gas jet, wherein an ionized atmosphere generated by corona discharge is blown into a subject 240 by jet of a gas to eliminate static electricity, the electrode part is provided with a plurality of needle electrodes 200 arranged in such a manner that their free ends are opposed to the subject 240, a rod electrode 210 arranged in parallel with an aligned direction of the free ends of the plural needle electrodes 200 in the lateral vicinity thereof and paired with the needle electrodes 200, and an insulating baffle plate 220 arranged between both electrodes so as to detour the discharge path of corona discharge, and the free ends of the nozzles 230 are arranged toward the vicinity of the rod electrode 210 in such a manner that the gas jetted passes through the vicinity of the rod electrode 210 to reach the subject 240 together with the ionized atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a static eliminator and a static eliminator for removing static electricity generated in a signature in the process of stacking folded books (hereinafter referred to as signatures) folded in two. A signature stacking device.

[0002]

2. Description of the Related Art The signatures discharged from a printing machine are collected and bundled in a predetermined number for transportation. A signature stacking device is used to quickly perform this stacking operation.

In the signature stacking device, static electricity is often generated between the signatures and the transport device or between the signatures, which hinders smooth transport and stacking. Damage to the ding may occur. So usually,
The signature stacking device is equipped with a static eliminator.

FIG. 1 is a diagram schematically showing a structure of a static electricity removing device according to a conventional technique. As shown in FIG. 1, this static eliminator is connected to a high voltage power source, and a needle electrode 100 and a needle electrode 10 to which a high voltage of several thousand volts is applied.
0, a grounded ring-shaped electrode 110 that surrounds the tip of the needle-shaped electrode 100, and a cylindrical insulator 1 that insulates between the needle-shaped electrode 100 and the ring-shaped electrode 110 and holds both electrodes.
20 and a cylindrical insulator 120 and a gas supply port 13 concentric with the cylindrical insulator 120.
It has 0. The tip of the gas supply port 130 has a tapered nozzle shape, and the side wall of the ring-shaped electrode 110 has an opening 11.
A plurality of 1 are provided.

When a high voltage is applied to generate corona discharge between the needle electrode 100 and the ring electrode 110,
The discharge path of the corona discharge is the tip of the needle electrode 100 located inside the ring electrode 110 and the ring electrode 110.
Connect to the inner wall of the. Therefore, the ionized atmosphere generated by the corona discharge is distributed inside the ring electrode 110.

The gas supply port 130 is arranged with its tip facing the object 140 from which static electricity should be removed, and the gas ejected from the gas supply port 130 is located inside the ring-shaped electrode 110. Of the object passing through the vicinity thereof toward the object 140 whose static electricity should be removed, and at that time, the ionized atmosphere distributed inside the ring-shaped electrode 110 is blown onto the object 140. As a result, the object 1
It is possible to remove static electricity charged on 40.

[0007] However, due to the gas injection from the gas supply port 130, an air flow entraining the outside air from the opening 111 is easily generated inside the ring-shaped electrode 110. Usually, since the outside air contains dust, the entrained dust is likely to be accumulated in the member inside the ring-shaped electrode 110. Furthermore, the static eliminator has a dust collecting effect due to its own charging. Therefore, in the needle-shaped electrode 100, there is a problem that the discharge efficiency decreases as the accumulation of dust progresses, and the discharge is stopped in some cases.

As described above, the conventional static eliminator has a problem that dust is likely to be accumulated and the efficiency of discharge is reduced or stopped due to the accumulation of dust, and the ring-shaped electrode 110 is used as the needle electrode 100. Since it has a shape that surrounds, there is a problem that cleaning is difficult.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a static eliminator capable of suppressing the dust collection effect and facilitating maintenance such as cleaning, and a signature stacking apparatus using the same. The purpose is to

[0010]

In order to achieve the above object, the present invention comprises an electrode portion for generating a corona discharge and a nozzle for injecting a gas, and an ionized atmosphere generated by the corona discharge In a static electricity eliminator that removes static electricity by spraying onto an object by jetting, the electrode section has a plurality of needle-shaped electrodes arranged so that their tips are directed toward the object, and the tips of the plurality of needle-shaped electrodes are lateral to the sides. A rod-shaped electrode that is arranged in the vicinity in parallel to the direction in which the tips are arranged and that forms a pair with a plurality of needle-shaped electrodes, and between the needle-shaped electrode and the rod-shaped electrode so as to bypass the discharge path of the corona discharge. A nozzle is provided with an insulating baffle arranged, and the tip of the nozzle is directed to the vicinity of the rod-shaped electrode so that the injected gas passes through the vicinity of the rod-shaped electrode and reaches the object with an ionized atmosphere. Providing the placed static eliminator To.

Since a plurality of needle-shaped electrodes are arranged and a rod-shaped electrode extending in the direction of arrangement of the plurality of needle-shaped electrodes is provided to form a pair with the needle-shaped electrodes, the insulating baffle plate is provided with the needle-shaped electrodes and the rod-shaped electrodes. However, it is not necessary to provide it between adjacent needle electrodes. As a result, the number of places where air is trapped when the gas is injected by the nozzles is reduced, and even if an air flow entraining dust contained in the outside air is generated, it is possible to suppress the accumulation of dust. In addition, maintenance such as cleaning becomes easy.

Further, since the effective range in which static electricity can be removed by one static electricity removing device is expanded, it is not necessary to arrange a large number of static electricity removing devices even when the object is large, and the static electricity can be removed over a wide range with high uniformity. be able to. Further, as compared with the case of arranging a plurality of static eliminators, it is possible to simplify installation work such as wiring.

Further, the signature stacking apparatus according to the present invention is a signature stacking apparatus in which printed signatures are sequentially wrapped by a transporting device and stacked at the end of the transporting device to form a stack. The above-mentioned static electricity removing device is provided at a place where a charged state is likely to occur.

This signature stacking device is provided with a nip roll part for squeezing air between folded sheets by pinching the signatures and sharpening the folds, and before the signature reaches the nip roll part, the signatures are gathered. It is preferable that the static electricity removing device is installed by extending the rod-shaped electrode in a direction that traverses the direction in which the signature is conveyed so that the static electricity that charges the signature is removed by injecting gas toward the.

Before the static electricity charged in the signature is removed by the static electricity removing device before being conveyed to the nip roll portion,
Sliding between overlapping signatures is smooth, and the alignment of signatures during transport is uniform. If the slippage between the signatures is not smooth, the press will be performed in the state of overlapping with the warp,
Sometimes the folds are misaligned and it becomes unsightly.

Further, the signature stacking device is provided with a severing portion for stopping the flow of the signatures at a certain position in order to temporarily interrupt the continuous transportation of the signatures by the winding and conveying device. In order to remove the static electricity charged in the signatures by injecting gas toward the series of signatures that pass through, the rod-shaped electrodes are extended along the signature transport direction, and the static electricity removal device is installed. Is preferred.

When the static electricity charged in the signature is removed by the static electricity removing device at the cut-off portion, the static electricity generated or remaining at the cut-off portion can be quickly removed.
As a result, when the signatures are discharged from the wrapping and conveying device and accumulated, the signatures are surely separated one by one.

Furthermore, the signature stacking device sequentially stacks the signatures discharged from the carry-out section of the winding and conveying device to form a small bundle of signatures and a large stack of small bundles. Equipped with a small bundle stacking unit that transfers small bundles to the next process for forming, when the signatures are stacked in the small bundle stacking unit, gas is ejected toward the signatures that are discharged from the carry-out unit and stacked. hand,
In order to remove static electricity charged in the signature, it is desirable that the static electricity removing device be installed by extending the rod-shaped electrode in a direction transverse to the signature transport direction.

When the static electricity charged in the signatures is removed by the above-mentioned static electricity removing device in the small bundle accumulating section, the slip between the overlapping signatures becomes smooth when discharged from the carry-out section and accumulated, and the signatures are distorted. It is possible to prevent them from being accumulated in various shapes.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a front view schematically showing an example of the structure of the static eliminator according to the embodiment of the present invention.
FIG. 3 is a side view schematically showing an example of the configuration of the static eliminator according to the embodiment of the present invention.

As shown in FIG. 2 or FIG. 3, the static eliminator according to the embodiment of the present invention includes an electrode portion for generating corona discharge and a nozzle 230 for gas injection. The ionized atmosphere generated by the discharge is blown onto the target object 240 by jetting gas,
Eliminates static electricity.

The electrode portion is composed of a plurality of needle-shaped electrodes 200 arranged so that their tips are directed toward the object 240, and adjacent to the sides of the tips of the needle-shaped electrodes 200, with respect to the direction in which the tips are arranged. A rod-shaped electrode 210 arranged in parallel and paired with a plurality of needle-shaped electrodes 200, and an insulating obstacle arranged between the needle-shaped electrode 200 and the rod-shaped electrode 210 so as to bypass the discharge path of the corona discharge. And a plate 220.

The nozzle 230 has a tip end portion of the rod-shaped electrode 21 so that the injected gas passes near the rod-shaped electrode 210 and reaches the object 240 with the ionized atmosphere.
It is arranged toward zero.

When a corona discharge is generated between the needle electrode 200 and the rod electrode 210 due to a high voltage, the discharge path of the corona discharge is diverted by the insulating baffle 220 and the insulating baffle 220 is removed. The needle-shaped electrode 200 and the rod-shaped electrode 210 are connected by sandwiching them. Therefore, the ionized atmosphere generated by the corona discharge is distributed not only on the needle-shaped electrode 200 side of the insulating baffle 220 but also on the rod-shaped electrode 210 side.

The nozzle 230 is arranged from the rear of the rod-shaped electrode 210 with its tip facing the object 240 from which static electricity should be removed. As a result, the gas ejected from the nozzle 230 passes through the vicinity of the rod-shaped electrode 210 toward the target object 240 where the static electricity should be removed, and at that time, the ionized ion is distributed to the rod-shaped electrode 210 side of the insulating baffle plate 220. The atmosphere is blown onto the object 240 to remove static electricity from the object 240.

In this way, the plurality of needle-shaped electrodes 200 are arranged, and the rod-shaped electrodes 210 paired with the plurality of needle-shaped electrodes 200.
By providing the above, it is not necessary to separate the adjacent needle electrodes 200. As a result, there are few places where a gas is accumulated when the gas is ejected from the nozzle 230, and the gas is ejected directly from the nozzle 230.
Even if the airflow that does not hit the air and entrains the dust contained in the outside air is generated, the accumulation of dust can be suppressed. Therefore,
In the needle-shaped electrode 200, it is possible to suppress the adverse effects such that the discharge efficiency decreases as the accumulation of dust progresses, and the discharge stops in some cases. Further, since it is easy to contact the periphery of the needle-shaped electrode 200 where dust is likely to accumulate, maintenance such as cleaning becomes easy.

Further, since the effective range in which static electricity can be removed by one static eliminator is large, it is not necessary to arrange a plurality of static eliminators even when the target object is large, and one static eliminator can be used to achieve high uniformity of static electricity. Can be removed. Further, as compared with the case of arranging a plurality of static eliminators, it is possible to simplify installation work such as wiring.

As a result of the above, the static eliminator according to the embodiment of the present invention has the excellent effects of having few failures and a long life. Further, even in maintenance, which is indispensable for the static eliminator, it is easy to reach the electrode, and it is possible to perform sufficient cleaning, and it is possible to reduce the labor for replacement.

On the other hand, the rod-shaped electrode 210 is composed of a plurality of needle-shaped electrodes 2.
00 may have a ring shape or a U-shape extending in the direction in which the tip portions are arranged so as to surround the lateral vicinity of the tip portions. Also in this case, the rod-shaped portion of the rod-shaped electrode 210 as shown in FIG. 2 and the insulating baffle 220 that blocks the space between the needle-shaped electrode 200 and the rod-shaped electrode 210 are provided.

Dimensions and the like of each main part of the illustrated static eliminator are as follows. Total length of the rod-shaped electrode 210: 175, 300, 400 mm, three types of insulating baffle 220 height: 27 mm Shortest distance between the needle-shaped electrode 200 and the rod-shaped electrode 210: 8
mm Distance between adjacent needle-shaped electrodes 200: 12.5 mm Diameter of needle-shaped electrodes 200: 0.3 mm Distance between tip of nozzle 230 and lower end of insulating baffle 220: 5.5 mm Discharge voltage: 7000 V Nozzle 230 Flow rate of gas from 0 to 30 l / min FIG. 4 is a diagram showing the configuration of the signature stacking device according to the embodiment of the present invention. The signature stacking device according to the embodiment of the present invention uses the static electricity removing device according to the present invention described above.

As shown in FIG. 4, in the signature stacking apparatus according to the embodiment of the present invention, the printed signatures 370 are sequentially wrapped by the winding and transporting device 380 and discharged at the end of the transporting device. The folded signatures are stacked to form a stack. This signature stacking apparatus is equipped with the above-described static electricity removing device according to the present invention at a place where a charged state is likely to occur in the signature. The static eliminator can be that shown in FIG.

Here, the nip roll unit 300 for squeezing the folded sheets 370 to squeeze the air between the folded sheets to sharpen the folds, and the continuous conveyance of the signatures 370 by the wrapping and conveying device 380 is temporarily performed. In order to discontinue the flow of the signatures 370 at a certain position in order to stop the signatures 370, the signatures 370 discharged from the unloading section 310 and the unloading section of the wrapping and conveying device 380 are sequentially accumulated to collect a predetermined number of signatures 370.
The signature stacking apparatus includes a small-bundle stacking unit 320 for forming a small bundle of the sheets and passing the small bundles to the next step for forming a large bundle in which the small bundles are stacked.

Further, as shown in FIG. 4, the signature stacking apparatus according to the embodiment of the present invention includes first to third static eliminators described below. The first static eliminator 340 injects gas toward the signature 370 before the signature 370 reaches the nip roll unit 300, and removes static electricity charged in the signature 370 so that the signature conveyance direction. The rod-shaped electrode 210 is installed so as to extend in a direction traversing.

The second static electricity removing device 350 includes
The rod-shaped electrode 210 is installed so as to extend along the signature transport direction so as to inject gas toward a series of signatures 370 passing through 10 and remove static electricity charged in the signatures 370. .

The third static eliminator 360 includes a signature 370.
When the sheets are accumulated in the small bundle accumulating unit 320, gas is ejected toward the signatures 370 that are discharged from the carry-out section and accumulated, so that the static electricity charged in the signatures 370 is removed. The rod-shaped electrode 210 is installed so as to extend in a direction crossing the transport direction.

If the static electricity charged in the signature 370 is removed by the first static eliminator 340 before the signature 370 is conveyed to the nip roll unit 300, the overlapped signatures 370 are removed.
The slip between them becomes smooth, and the alignment of the signatures during transportation is uniform. If the slippage between the signatures is not smooth, the press may be performed in a state where it is overlapped with the distorted parts, and the folds may be misaligned to make it unsightly.

Further, when the static electricity charged on the signature 370 is removed by the second static electricity removing device 350 in the cut-off portion 310, the static electricity generated or remaining in the cut-off portion 310 can be quickly removed. As a result, when the signatures 370 are discharged from the winding and conveying device 380 and accumulated,
The signatures 370 are reliably separated one by one.

Further, at the stage where the normal signatures 370 are conveyed to the nip roll section 300 and at the set-cutting section 310, in order to improve the alignment in the direction perpendicular to the conveyance direction of the signatures (left and right direction), Although a vibrator (not shown) is operated on the left and right end faces of the device, since the static electricity between the signatures at the above-mentioned places is removed by the operation of the first static electricity removing device 340 and the second static electricity removing device 350 of the present invention,
The alignment of the left and right edges of the signature is dramatically improved.

On the other hand, when the static electricity charged on the signatures 370 is removed by the third static electricity removing device 360 in the small bundle accumulating section 320, when the signatures 370 are discharged from the carry-out section and accumulated, the slip between the overlapping signatures 370 is smooth. Next, signature 370
It is possible to suppress the accumulation of irregular shapes.

[0041]

As described above, according to the static electricity removing device of the present invention, it is possible to suppress the accumulation of dust in the vicinity of the needle electrode, and to discharge the dust in the needle electrode as the accumulation of dust progresses. It is possible to suppress the adverse effects such as a decrease in efficiency and, in some cases, a discharge stop. Further, maintenance such as cleaning becomes easy.

Further, since the effective range in which static electricity can be removed by one static electricity removing device is expanded, it is not necessary to arrange a large number of static electricity removing devices even when the object is large, and the static electricity is removed with high uniformity over a wide range. be able to. Further, as compared with the case of arranging a plurality of static eliminators, it is possible to simplify installation work such as wiring.

On the other hand, according to the signature stacking apparatus of the present invention using the above static electricity removing apparatus, a stable static electricity removing effect can be obtained with high uniformity, and the transportation and stacking of signatures can be smoothly carried out. Therefore, there is an excellent effect that work efficiency can be improved and running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a static electricity eliminator according to a conventional technique.

FIG. 2 is a front view schematically showing the configuration of the static electricity eliminator according to the embodiment of the present invention.

FIG. 3 is a side view schematically showing the configuration of the static electricity eliminator according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a signature stacking device according to an embodiment of the present invention.

[Explanation of symbols]

200 needle electrodes 210 Rod electrode 220 Insulating baffle 230 nozzles 240 Target 300 Nip roll section 310 Setuki part 320 Small bundle stacking unit 340 1st static eliminator 350 Second static eliminator 360 Third static eliminator 370 signatures 380 Rolling Conveyor

Claims (5)

[Claims] 1. An electrode part for generating a corona discharge and a nozzle for injecting a gas are provided, and an ionized atmosphere generated by the corona discharge is sprayed on a target object by injecting a gas,
In a static electricity removing device for removing static electricity, the electrode portion includes a plurality of needle-shaped electrodes arranged so that the tip portions thereof face an object, and the tip portions of the plurality of needle-shaped electrodes near the side portions of the tip portions. And a rod-shaped electrode that is arranged in parallel with the arrangement direction of the pair of needle-shaped electrodes and is arranged between the needle-shaped electrode and the rod-shaped electrode so as to bypass the discharge path of the corona discharge. And an insulating baffle, and the nozzle is such that the injected gas passes near the rod-shaped electrode and reaches the object with the ionized atmosphere, so that the tip portion is near the rod-shaped electrode. A static eliminator that is arranged facing. 2. A signature stacking device in which printed signatures are sequentially transported by a winding transport device and stacked at a terminal end of the transport device to form a stack, and charged at a place where a charged state is likely to occur in the signature. A signature stacking apparatus comprising the static eliminator according to Item 1. 3. A nip roll part is provided to squeeze air between folded sheets by pinching the signatures and sharpen the folds. Before the signature reaches the nip roll part, a gas is directed toward the signatures. The static electricity removing device is installed by extending the rod-shaped electrode in a direction transverse to the direction in which the signatures are conveyed so as to eject static electricity that charges the signatures. The signature stacking device described in 2. 4. A series of slitters for stopping the flow of the signatures at a fixed position for temporarily interrupting the continuous transport of the signatures by the winding transport device, In order to remove the static electricity charged in the signature by injecting gas toward the signature, the rod-shaped electrode is extended along the signature transport direction, and the static electricity removing device is installed. The signature stacking apparatus according to claim 2, wherein the signature stacking apparatus is a stacking apparatus. 5. The next step for forming small bundles of a predetermined number of signatures by sequentially stacking signatures discharged from the carry-out section of the winding and conveying device and forming a large bundle of small bundles. A small-bundle stacking unit for passing the small bundles is provided, and when the signatures are stacked in the small-bundle stacking unit, gas is ejected toward the signatures that are discharged from the carry-out unit and stacked, and folded. 5. The static electricity removing device is installed by extending the rod-shaped electrode in a direction transverse to the signature conveying direction so as to remove static electricity charged in the signature. The signature stacking device described in.