JP3606679B2 - A device that stabilizes the conveyance of a sheet in a sheet processing machine, especially a sheet rotary printing press. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is based on the premise section 請 Motomeko 1, relating to at least partially equipment that Ru a sheet to be floated to the guide is stable in the sheet transport device in the sheet processing machinery .
[0002]
[Prior art]
It is known from the engineering that air that is rejected by an object moving in the air is damped in front of the object and then flows along the periphery of the object, separating alternately up and down behind the object (e.g. Textbook “Abgeleste Stroemungen” Flow Separation, Dr.-Ing. Alfred Leder, Vieweg Verlag 1992). As a result, air vortices whose rotational directions are opposite to each other are formed in the “dead water region” of the object. A sheet, especially a thin sheet, which is transported by being lifted entirely or partially within the machine is fluttered and shaken by the action of such air vortices. These air vortices are generated in the so-called “dead water area” behind the holding system that holds the leading edge of the sheet by means of the sheet holding system, in particular the sheet holding and holding bridge. The movement of the sheet caused by the holding system moving relative to the other machine parts slightly enhances the effects of these air turbulences, resulting in energy transfer to the sheet whose leading edge is held by the holding system. The different air vortices act alternately from below and above to shake the sheet.
[0003]
Various methods are known as countermeasures for preventing this shaking motion. This measure consists of a sheet gripper placed on the gripper bridge in a paper discharge chain equipped with a gripping system placed on a circulating transport chain. For example, a sheet from above or below It is comprised with the spraying device or suction device formed so that an impact force might be given. The suction device can suck the back side of the unprinted sheet toward the fixed guide device side. Levitation guidance is also performed in which a sheet is supported by a guide air layer and conveyed, but such a guide air layer is disturbed by air turbulence. It is also well known to provide these spraying devices or suction devices in the sheet guide cylinder of a printing machine in order to smoothly transport the sheet. Another measure is to arrange a guide plate that forms a narrow gap for sheet guidance.
[0004]
Further, the JP Rights 1994 No. 270392, discharge apparatus is disclosed having a shield plate for preventing the flapping of the printing paper which runs sandwiched chain gripper. The chain gripper is supported at both ends made along the chain to cycle, and a chain gripper shaft having a plurality of clamp seat in the axial direction, is supported rotatably parallel to pivot the chain gripper shaft, and the claw in the axial direction It is formed from a claw shaft having a claw respectively facing the seat. Therefore, the air flow enters between the sheet and the paper guide to move at high speed sandwiched this gripper, in order to prevent the flapping of the sheet, CHAIN down below the paper gripper shaft By providing a shielding plate made of, for example, a steel plate that covers the front surface of the claw with a small gap between the guide and the guide, air inflow is prevented between the sheet sandwiched by the gripper and the paper guide. Yes.
[0005]
However, in the case of this conventional example, since the gap between the shielding plate and the paper guide is small, the setting is not easy. If the shielding plate is not set very accurately, the paper guide is damaged. There is a disadvantage that there is a risk of losing.
[0006]
[Problems to be solved by the invention]
The present invention takes a separate method different from the above. An object of the present invention, broadly prevent the formation of vortices of air described above in the sheet processing machinery, thereby auxiliary energy and guiding devices without requiring, Ahn the sheet transport in the machine It is to be fixed .
[0007]
[Means for Solving the Problems]
The present invention thus resolves to equipment having the features according the object of the 請 Motomeko 1.
[0008]
The gap plug can be formed as an auxiliary guide element or block element co-operating with the holding system, or it can be formed by the structural form of the holding system itself. It is also possible to specially form a holding system, thereby broadly preventing the formation of an air flow around the conveyed sheet.
[0009]
With these configurations, the retention system in transporting the addition of front sheet, simple measures are implemented to prevent the flow of lower causing air turbulence, inter alia, on the lower side of the sheet air held is prevented from being displaced by disturbance of air. Although it is possible to completely close the gap between the holding system and the mechanical part to which the system moves relative to it, it is not absolutely essential. A gap for generating a laminar flow below the sheet without disturbing disturbance may remain between the sheet and the sheet guide plate. In any case, a homogeneous air layer is created on the underside of the sheet, and the air layer continuously and completely fills the space between the sheet and the sheet guide plate, so No stable sheet guidance is guaranteed. The fundamentally laminar flow under the sheet thus created moves on average slower than the sheet, and its flow rate is approximately one-half of the sheet speed. In this case, this air flow also exerts a tangential stress, and thus a force in the direction opposite to the direction of movement of the sheet, whereby the sheet is pulled in the direction opposite to the direction of movement. The lower flow blocking material for the holding system that transports the sheet of paper along the front edge can be formed in a wide variety of ways. Sheet processing machinery, especially for sheet-fed rotary printing press retention system circulating conveyor chain provided in the paper discharge apparatus, for example, attached to the holding system, the retention located in the sheet forward Brush- like strips that circulate with the system are suitable. Further, instead of such brush- like strips , a flexible material, in particular a cover plate made of plastic or rubber or other soft material is also suitable. In order to prevent the formation of an air flow around the edge of the brush- like strip or another material made of a cover plate, it is appropriate to form a guide body made of a flexible material at both ends of the cover plate. Such a guide compact is known, for example, as a so-called small wing in aircraft production.
[0010]
In particular, it is possible to form a predetermined gap between the holding system that holds the front edge of the sheet and the mechanical part that can move relative to the system by means of a flexible material made of a cover plate. In particular, in the case of a holding system with a gripper bridge in which individual sheet grippers are arranged, it is appropriate to form such a spoiler with a minimal gap. In this case, the effect of improving the air flow similar to the spoiler can be obtained by forming the upper shunt edge. In the case of a holding bridge, a blocking plate can be arranged in the preceding system.
[0011]
In the case of a holding device provided on the sheet guide cylinder, a blocking device, for example, a blocking material in front of the gripper bridge, is placed in the cylinder gap of the sheet guide cylinder so that air flows around the holding device. Therefore, the occurrence of turbulent flow can be prevented entirely or partially, and a significant improvement in sheet guide and sheet conveyance in the sheet guide barrel can be realized. . In order to avoid collision with the surface of the adjacent cylinder, it is possible to arrange the flow prevention material so that the lower flow preventive material enters the cylinder gap of the adjacent cylinder and at the same time prevents the flow transfer to the adjacent cylinder It is.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, it described with reference to the accompanying drawings, embodiments of the present invention.
[0013]
FIG. 1 shows a final printing unit 2 of a sheet-fed rotary printing press and a paper discharge device 1 connected to the unit. Two recirculating transport chains 3 parallel to each other and a sheet gripper 5 that sequentially holds sheets 6 at the front end in the sheet transport direction, and a gripper bridge that is attached to the transport chain at regular intervals. the is sheet comprised chain type conveying device 4 conveys the printing unit 2 to the sheet pile 7, the sheet was released at a predetermined position, thus the sheet is sequentially sheet pile Stacked. At that time, the sheet 6 is moved relative to the sheet guide plate which is a fixed machine part. In the illustrated printing unit 2, the sheet 6 is held at the front end by a sheet holding nail 5 which is also arranged at the holding nail bridge by a sheet guide cylinder 9, and in particular the sheet fixed at the transfer cylinder. It is moved to face the guide plate 8.
[0014]
To prevent the vortex of air would result interfere with stable sheet transport is formed, grippers having other retention system for applying sheet gripper 5 or sheets front The gap between the bridge 4 and the sheet guide plate is sufficiently blocked by the blocking means 10. Such gap blocking can be implemented both for the holding system for holding the front edge of the sheet in the paper discharge device 1 and for the holding system for holding the front edge of the sheet in the sheet guide cylinder 9 of the printing unit 2.
[0015]
FIG. 2 shows an embodiment of this kind of blocking means 10 arranged on the front side of the gripping bridge 4 in the sheet conveying direction. The blocking means includes, for example, a brush- like strip 11 for closing a gap 12 between the holding bridge 4 and the sheet guide plate 8. Since the formation of the lower flow of the sheet 6 due to the gripper bridge 4 moving at a certain relative speed with respect to the sheet guide plate 8 is avoided by the brush- like strip , the upper side of the gripper bridge The air flow is formed only along the line, and the air vortex is formed only above the sheet. On the other hand, a certain amount of cooperating air remains on the lower side of the sheet, which acts as a cushion and supports the sheet, resulting in disturbance that interferes with the sheet conveyance without contact. There is no. The brush strip 11 also serves to release the gap 12 between the gripper bridge 4 and the sheet guide plate 8 from contaminating particles. In addition, since the hair of the brush- like strip 11 is easily bent, there is an effect that the sheet guide plate 8 is not damaged. Otherwise, ink that has not yet dried adheres to the guide plate 8 from the surface of the sheet 6 and is damaged by the hair of the brush. Ink of this kind can therefore be avoided with this type of apparatus, since ink can be deposited very rapidly.
[0016]
And example of an application is shown in gripper bridge with pre run unit 13 features of the present invention in FIG. In this case, the blocking means 10 must be provided both between the lower side of the front running unit 13 and the sheet guide plate 8 and between the front running unit 13 and the original holding bridge 4. In order to clarify that the blocking means can be formed in various ways, in FIG. 3, a brush- like strip 11 is arranged between the front running unit 13 and the holding bridge 4, Between the sheet guide plate 8, a blocking plate 14 made of an elastic material is preferably arranged. In the case of the cover plate 14, for example, a rubber piece or a plastic piece can be used. The hiding piece made of this kind of material much softer than the sheet guide plate 8 does not damage the sheet guide plate 8 and can reliably obtain the same effect as described above with reference to FIG. it can.
[0017]
Figure 4 there is shown a profile 15 for plugging with the angle-shaped cross section, the isomorphic member is fixed to the gripper 4 has one leg slightly the other leg from the sheet guide plate 8 Move forward and move forward. The advantage of the next extension can be obtained by the lower leg extending parallel to the sheet guide plate 8 over several centimeters. That is, the interval between the sheet-shaped guides 15 with respect to the sheet guide plate 8 is larger under the same conditions as in the case of a simple shielding plate as disclosed in Japanese Patent Laid-Open No. Hei 6-270392 described above as a conventional technique. be able to. The reason is that the length of the air flow passage between the lower surface (25) of the lower bent portion of the leg 15 and the sheet guide plate 8 is longer. Therefore, because of this large distance, damage to the sheet guide plate 8 that may occur if the sheet guide plate 8 is not set correctly can be more easily avoided.
[0018]
In FIG. 5, unlike the configuration described above with respect to the means (10) for closing the gap between the system for holding the front end of the sheet and the sheet guide plate, the holding bridge 4 and the sheet guide plate 8 state a gap is closed by the sectional shape of the filling bridge 4 itself added is shown between. In this case, the gripper bridge 4 has a blocking shape 16 formed as a downwardly facing protrusion, which protrudes slightly below its sheet (26) from the sheet guide plate 8. In this way, the gap 12 is closed. By providing this type of deformed protrusion, an air vortex can be formed on the front surface of the protrusion, and the air vortex can block the gap between the protrusion and the sheet guide plate. Forming the lower surface (26) of the protrusion over several centimeters parallel to the sheet guide plate 8 provides the same advantages as the previous example described with reference to FIG.
[0019]
Finally , FIG. 6 shows an example in which the above-described blocking means (10) is applied to a holding system in which the front end of the sheet is provided, provided in the sheet guide cylinder 9. This embodiment, like, single addition the front edge of the sheet 6 to perform the conveyance of the leaves paper grippers having a 5 grippers sheet to relative movement relative to the fixed sheet guide plate 8 The bridge 4 is shown. Blocking means 10 for blocking the gap between the gripper gripper bar 4 to the sheet transport direction front side of the bridge sheet guide plate 8, for example, brush JoHosohen 11 is disposed. It is self-evident that instead of the brush- like strips 11, the cover plates or cover profiles 14, 15, 16 described in FIGS. 2 to 5 can be used. In this case, the lower leg of the blocking member 15 and the outer shape of the blocking protrusion 16 must, of course, have a circular cross section and be adapted to the inner diameter of the sheet guide plate 8. I must.
[0020]
A shunting effect similar to that of a spoiler is achieved by forming a shunt edge (17) in the holding system profile in place of or in addition to the blocking means (10) described above. (See FIG. 5). In order to prevent the formation of air flow around the end of the holding system, the desired effect can be reinforced by forming a special deflecting device or a shaped body for the deflecting.
[0021]
【The invention's effect】
The present invention broadly prevents the formation of air vortices that interfere with the stable transport of sheets, and does not require auxiliary energy or provide auxiliary guides. conveying the can be stabilized for. Measures to prevent the occurrence of turbulent flow, especially under the sheet, produced by the holding system that transports the sheet with the leading edge added can vary depending on the flexible material gap blocking means or the special formation of the holding system itself. It can be easily realized.
[Brief description of the drawings]
FIG. 1 is a side view of a sheet-fed rotary printing press sheet discharge device.
FIG. 2 is a side view of a brush- like strip that closes a gap between a holding bridge and a sheet guide plate.
FIG. 3 is a side view of a cover plate that covers a gap between a preceding unit and a sheet guide plate and a gap between a preceding unit and a subsequent gripper unit.
FIG. 4 is a side view of a blocking member having a configuration different from that shown in FIG. 2;
FIG. 5 is a side view of a gap blocking projection formed by a specially formed gripper bridge.
FIG. 6 is a side view of a brush- like strip for closing a gap between a holding bridge disposed on a sheet guide cylinder and a sheet guide plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper discharge apparatus 2 Printing unit 3 Conveying chain 4 Feeding paper bridge 5 Sheet paper holding paper 6 Sheet paper 7 Sheet paper pile 8 Sheet paper guide board 9 Body 10 Blocking means 11 Brush- like strip 12 Crevice 13 Unit 14 Cover plate 15 Cover profile 16 Cover profile 17 Split edge 25 Surface 26 Surface

Claims (9)

Retention system applying the leading end of the sheet is moved at a interval between other machine part (8) or al, and Nde take gap circumference over with sheet width the machine part (8), said retention system the has a means (10) to fully sequester the gap (12) between the machine part (8), said means (10), said machine part (8) for guiding the sheet is configured as a strip or plugging protrusion for blocking made from a flexible resilient material than the material, it is guided at least partially floating in the sheet transport apparatus of the sheet processing machinery that leaves paper equipment that Ru is stable. The blocking for strip is brush JoHosohen (11) Apparatus according to claim 1. The blocking protrusion is a rubber protrusion (14), Apparatus according to claim 1. Sheet holding system applying the leading end of is moved Oite the interval between other machine part (8) or al, the which enclose take a gap spanning the entire sheet width with machine part (8), said retention system and the machine part has a means (10) to fully block the gap (12) between the (8), said blocked to means (10), single said machine part for the leaf paper guide (8 ) to have the guide portion to have a surface that extends have you substantially parallel small distance (25, 26) and (15, 16) Nde including, at least in part in the sheet transport apparatus of the sheet processing machinery to emerged to equipment that Ru is stable the sheet to be guided. The guide portion (15) is a angle profile which is fixed to the holding system for the sheet leading edge, according to claim 4. 5. A device according to claim 4 , wherein the guide (16) is formed by shaping the gripper bridge (4) into a predetermined shape . The gripper bridges formed as the guide portion has an upper air diverting edge (17), thereby the tufts tool works similar to spoiler device of claim 6. The sealed to means (10), Ru Tei is placed on gripper bars of the gripper system to circulate by the conveyor chain (3) (5) (4), in any one of claims 1 to 7 The device described. Means for the blockade (10), in the cylinder gap of the sheet guiding cylinder of sheet-fed rotary printing press (9), Ru is placed in front of the grippers sheet grippers system Tei, claim The apparatus according to any one of 1 to 7.

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