JPS59136261A - Ink drier for sheet-fed rotary press - Google Patents

Abstract

PURPOSE:To prevent spoilage, deterioration of a paper conveyor member and overheating of the inside of a casing, by providing a driving apparatus which causes all the shutters to pivot simultaneously, in response to a suspending operation of the printer, such that the opening of the casing is closed in a blind- like manner. CONSTITUTION:When the printer is suspended in order to replace a pile table 24 of a delivery apparatus 4 with an empty pile table because the amount of paper 5 on the pile table 24 has reached a predetermined value, a piston rod 45 of an air cylinder 44 is expanded through a controller. Through a lever 46 and a slide angle 48, a slide pin 49 causes a shutter 41 to pivot against its own weight. Consequently, the opening of a casing 31 is closed with a space left between the adjacent shutters 41 in the same manner that a blind is closed, thereby shutting off radiation heat. In this case, the pile of paper 5 is at rest together with a delivery chain 17. There is, however, no possibility that the paper 5 may be discolored, deformed or burnt on heating. Further, although the shutters 41 are closed, a space is formed between the adjacent shutters 41. Therefore, there is no possibility that the inside of the casing 31 may be overheated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an ink drying device for drying printing ink by heating paper printed by a printing unit in a sheet-fed rotary printing press before ejecting the paper.

[Prior art]

In printing operations using a sheet-fed rotary printing press, the paper printed by the printing unit is conveyed one by one while being gripped by the claws of the paper ejection chain, and at the end of the conveyance, it is released from the claws and falls onto the paper stacking table. be done. In this case, the printing ink is not dry.
When stacked, the printing ink on the lower layer paper is transferred to the back side of the upper layer paper, causing so-called set-off.

Conventionally, attempts have been made to install a spray device near the paper ejecting device and spray powder onto the printed paper surface in order to prevent bleed-through. Or, when this paper is fed to the printing machine again for additional printing, powder may adhere to the printing cylinder bracket or plate surface, causing printing problems. The disadvantage is that the particles float in the air, significantly deteriorating the working environment.

In addition, as another measure to prevent paper transfer, a paper ejecting operation called "Itadori" has been adopted. This is done by placing sleepers on both sides of the stacked paper every time a predetermined amount of paper is loaded on the paper stacking table, and inserting a board on the sleepers while watching the timing of the paper fall to continue stacking the paper. The paper is stacked in several stages to reduce paper pressure due to weight and prevent set-off. However, this sheet-cutting work is difficult to insert the sheet-boarding board and requires a long line, and this is not a fool's errand that can result in paper waste. This method has the disadvantage that the paper must be reloaded to the paper feed position while removing the board, and this reloading operation requires a great deal of labor and time.

In view of the above points, conventional practice has been to install an ink drying device in the paper conveyance path by the paper ejection chain to heat the paper, dry the ink, and then eject the paper.
Generally, infrared or ultraviolet radiant heat is widely used as the heat source.

For example, in the case of an infrared type ink drying device, this type of ink drying device is equipped with a box-shaped drying unit equipped with an infrared lamp, and the paper being transported is irradiated with infrared energy of 500 to 60°C, which is radiated from the lamp. However, printing machines are not necessarily operated continuously, and may be stopped, for example, when reloading paper, replacing the output paper stack, or when a paper feed failure occurs, and at this time the paper may dry out. If the paper was stopped in front of the unit, the paper would discolor and deform due to the heat, resulting in wasted paper, and depending on the quality of the paper, it could burn, which was extremely dangerous from a safety standpoint. Further, there is a drawback that the claws, claws i, etc. that hold the paper in their mouths deteriorate due to turning over the stoppage in the heated state, resulting in a decrease in their durability.

[Summary of the invention]

The present invention has been made in view of the above points, and includes a housing in which a heat source for drying is installed inside, and a plurality of blind-like shutters arranged in parallel at the opening facing the printed paper surface so that the shutters can be opened under their own weight. By providing a drive device that hangs down from the printer and rotates the shutters all at once so as to close the opening of the housing in conjunction with the stop operation of the printing device, the paper surface and the heat source are always connected when the paper is stopped. An ink drying device for sheet-fed rotary printing presses that cuts off air circulation while still allowing it to flow, prevents the occurrence of paper waste, deterioration of paper conveyance members, and overheating inside the housing, and improves work safety. This is what we provide. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

1 to 7 show an embodiment of an ink drying device according to the present invention, FIG. 1 is a schematic side view of a four-color sheet-fed rotary printing press in which this is implemented, and FIG. 2 is an ink drying device mounting section. FIG. 3 is an enlarged front view, FIG. 4 is a front view of the ink drying device, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG.
The figure is a BB sectional view of FIG. 4, and FIG. 7 is a front view of the shutter.

In the figure, a printing press 1 is comprised of a paper feeder 2, a four-color printing unit 3, and a paper ejection device 4. The paper feeding device 2 is provided with a paper stacking table 6 that loads paper 5 and automatically rises as the paper 5 decreases due to paper feeding. A sucker device (not shown) that feeds the paper onto the differential plate T is provided. Each printing unit 3 includes a plate cylinder 8 on which a printing plate is attached, a blanket cylinder 9 to which an image formed on the plate surface is transferred using ink and water from an inking device and a water supply device, and this blanket cylinder 9. A double diameter transfer cylinder 1 is provided between the impression cylinders 10 of adjacent printing units 3.
1 are arranged respectively. Reference numeral 12 denotes a swinging device which swings the paper 5 on the difference plate 7 one by one and transfers it to the claw of the impression cylinder 10 of the first color. The paper discharging device 4 includes a double diameter paper discharging cylinder 13 that is in contact with the impression cylinder 1° for the fourth color, and a pair of left and right sprockets 14 fixed coaxially therewith.
A paper discharge chain 17 running in the direction shown by arrow C in the figure is stretched between a pair of left and right sprockets 16 provided at the front end of the paper discharge frame 15. What is generally indicated by the reference numeral 18 in FIG. 2 is a plurality of sets of paper ejection claws arranged at regular intervals on the paper ejection chain 17, and is a rotatable claw shaft supported between the left and right paper ejection chains 17. 19 and a fixed nail stand shaft 20, and on the nail shaft 19, a plurality of pawls 21 are arranged in parallel. Further, a plurality of nail stands 22 are arranged in parallel on the nail stand shaft 20 in correspondence with the claws 21. The pawl 21 is biased in the closing direction by a spring member, grips the paper 5 passed from the pawl of the impression cylinder 10 with the pawl base 22, conveys it as the paper discharge chain runs, and transfers it to the vicinity of the sprocket 16. A roller 23 integrated with the pawl shaft 19 is attached to the provided pawl opening cam (not shown).
When they come into contact with each other, the claws 21 open against the spring pressure, and the paper 5 is released from the grip and falls. A paper stacking table 24 is provided below where the paper 5 falls and is loaded with the paper 5 and automatically lowers according to the loaded amount. Reference numeral 25 designates a plurality of paper guides that are supported on the paper ejection frame 15 side and are arranged in parallel along the rising portion of the paper ejection chain 1T to bring the paper 5 into sliding contact and prevent it from sagging. .

In the printing press 1 configured as described above, an ink drying device, generally designated by the reference numeral 30, is provided inside the multiple upright portions of the paper ejection chain 1γ so as to be parallel to the paper 5 being conveyed. ing. This ink drying device 30 includes a rectangular box-shaped housing 31 in which the opposing front surface of the paper 5 and the opposite back surface are completely open, leaving a part of the four circumferences.
is supported at its four corners by brackets 32 fixed to the left and right paper ejection frames 15 in pairs. The reference numeral 33 is a rear cover that closes the rear opening of the housing 31, and is fixed to the periphery of the opening with bolts 34, and can be removed from the housing 31 by loosening the bolts 34. It is configured as follows.

This back cover 33 has a double structure, and a heat insulating material 35 is interposed inside. Inside the casing 31, a plurality of rod-shaped infrared lamps 36 (six in this embodiment) as drying heat sources are mounted with both ends supported by holders 37, not shown. Connected to the power supply by a lead wire. A reflector plate 38 is formed on the back cover 33 in a semicircular arc shape and reflects the heat irradiated by the infrared lamp 36. The reflector plate 38 is formed to have the same length as the infrared lamp 36 and is fixed to the back cover 33 with bolts 39. ing. Gap lips 38a are provided on the outer surfaces of the three reflective plates 38 arranged alternately among the six reflective plates 38 at multiple locations along the entire length, and serve as reinforcement.
By attaching both ends of this clearance rib 38a to the adjacent reflecting plate 38, a slit for ventilation is formed at a location where there is no clearance rib 38a.

A shutter receiver 40 having an angular cross-section is welded to the inner surface of both longitudinal side plates of the casing 31, and a plurality of pin holes are formed in parallel in the longitudinal direction of the shutter receiver 40. As shown in the front view in FIG. 7, shafts 42 and 43 at both ends of a plurality of blind-shaped shutters 41 are respectively fitted. The shutter 41 has both end shafts 42 and 43 offset to one end in the width direction, so that it is suspended under its own weight so as to assume the open position shown in the figure. The width and pitch are set so that when the shutters 41 are rotated together, the opening of the housing 31 is closed in the form of a blind with a gap formed between adjacent shutters 41 . Further, the shutter 41 is usually supported by its own weight by supporting it on the shutter receiver 40 with the shorter end shaft 43 facing down, but by pushing it up in the axial direction, the end shaft 43 The shutter 41 is configured such that it can be removed from the pin hole to remove the shutter 41. code 4
Reference numeral 4 denotes an air cylinder as a driving device for closing the shutters 41 all at once, and the air cylinder 44 is pivotally supported at the back end of the housing 31 so as to be offset to one side in the longitudinal direction. It is electrically connected to the printing cylinders 8, 9, 10 and the paper ejection chain 1.
The piston rod 45 is configured to extend in conjunction with the stopping operation of the seventh printing device. One end of a lever 46 whose central portion is pivotally supported on the inner surface of the casing 31 is pivotally attached to the working end of the piston rod 45, and the other end of the lever 46 is inserted into a long hole 4T provided in the shutter receiver 40. It is involved. Furthermore, the protruding end of the lever 46 from the elongated hole 47 is connected to the housing 3.
It is pivoted to a long slide angle 48 with an orthogonal cross section that is slidably provided at one corner of the 1st corner along the inner surface of the 1st corner.
The slide angle 48 has a plurality of slide bins 49.
are welded to be located adjacent to each shutter 41 in the open position. By doing this, when the piston rod 45 of the air cylinder 44 is extended, the lever 4
6 swings, the slide angle 48 moves to the right in FIGS. 4 and 5, and the slide bin 49 rotates the shutter 41 all at once to close the opening of the housing 31.

Further, on the outer surface of the back cover 33, a plurality of pieces (in this embodiment, three pieces are arranged in parallel in the longitudinal direction at the center of the width direction of the back cover 33, but in FIG. Fans 50 (shown in the figure) are attached, and ventilation holes 51 corresponding to each fan 50 are bored in the rear cover 33. These fans 50 are constantly rotating during the printing process, and have the function of convecting radiant heat, blowing away deposits on the lamp 36, and cooling the inside of the housing 31. The liquid is blown out from the space between the lamps 36 through the slit formed by the gap lip 38a between the adjacent reflecting plates 38 to the space on the lamp 36 side.

The operation of the printing press and ink drying device configured as above will be explained. The papers 5 stacked on the paper stacking table 6 are suctioned one by one by a suction device, sent onto a transfer plate T, and then gripped by the claws of an impression cylinder 10 by a swing device 12. This paper 5 is transferred from the impression cylinder 10 to the transfer cylinder 11 and to the transfer cylinder 1.
The grips are changed sequentially from the impression cylinder 1 to the next impression cylinder 10, and while being conveyed, four-color printing is applied to the blanket cylinder 9, and then the sheet is changed to the discharge mold 18. paper guide 25
The material is transported while sliding in contact with the material. At this time, the ink drying device 3
Since the shutter 41 of 0 is hanging down due to its own weight and the opening of the housing 31 is open like when opening a blind,
Radiant heat from the infrared lamp 36 reflected by the reflector plate 38 is convected by the fan 50 and irradiated onto the paper 5 being conveyed through the upright portion of the paper discharge chain 17, thereby drying the printed ink. The dried paper 5 is further conveyed, and at the end of the conveyance, it is released from the paper discharge mold 18 and falls onto the paper stacking table 24, where it is stacked. In this case, since the printing ink is dry, set-off does not occur even if the paper 5 is stacked on the paper stacking stand 24 without boarding, so-called stacking.

For example, when the paper 5 on the paper stacking table 24 of the paper ejecting device 4 reaches a predetermined amount and the printing apparatus is stopped in order to replace it with an empty paper stacking table, the piston of the air cylinder 44 is activated via the control device. As the rod 45 extends and the slide bin 49 rotates the shutter 41 against its own weight via the lever 46 and the slide angle 48, the opening of the casing 31 closes to the adjacent shutter like when a blind is closed. 41 is closed leaving a gap between them to block radiant heat. Therefore, although the paper 5 is stopped together with the paper discharge chain 17 at this time, the paper 5 will not be heated, discolored, deformed, or burned. Moreover, even if the shutters 41 are closed, a gap is formed between adjacent shutters 41 to allow air to circulate, so that the inside of the housing 31 does not become overheated. Note that the shutter 41 may be removed from the housing 31 for cleaning etc.
When removing it from the shutter angle, by grasping it and pushing it up in the axial direction, the end shaft 43 will come out of the pin hole of the shutter angle 40, so it can be easily removed by pulling it toward you.

In this embodiment, an example is shown in which the ink drying device 30 is provided at the rising point of the paper ejection chain 17, but in the case of a paper ejection device equipped with a horizontal paper ejection chain without a rising portion. The device may be installed horizontally. However, in this case, no self-weight is applied to the shutter 41 in the axial direction, and the end shaft 4
3 may come off due to vibration, etc., so it is necessary to prevent it from coming off by applying pressure with a spring member, etc. Further, this device may be installed horizontally above the paper stacking table 24. Further, in this embodiment, an infrared lamp is used as an example of the drying heat source, but the infrared lamp may be a near-infrared lamp with a short wavelength, or a far-infrared lamp with a long wavelength of visible light. Furthermore, an ultraviolet lamp or the like may be used, and the type of heat source is not limited.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the ink drying device of a sheet-fed rotary printing press, a plurality of blind-like shutters are installed in the opening facing the printed paper surface of the housing in which the drying heat source is installed. The printer is arranged in parallel and hangs down to an open position under its own weight, and is provided with a drive device that simultaneously rotates the shutters so as to close the opening of the housing in a blind-like manner in conjunction with the stopping operation of the printing device. During the printing process, the ink on the printing paper dries, which prevents set-off, and when the printing device stops, the shutter is instantly closed in conjunction with this stopping operation, and the heat is removed. Since the irradiation is blocked, the paper will not change color, deteriorate in quality, or burn, preventing the occurrence of paper waste.
Improves work safety. In addition, the paper ejection claws of the paper ejection chain are not repeatedly overheated, their deterioration is prevented, and their durability is improved, and printing paper can be prevented from being soiled by grease leaking from the claw shafts and the like. Furthermore, by making the shutters slightly narrower than the pitch so that there is a gap between the shutters when they are closed, the casing is not completely sealed, so heat does not get trapped inside, preventing heat sources, reflectors, etc. can improve the durability of

[Brief explanation of drawings]

1 to 7 show an embodiment of the ink drying device according to the present invention, the first part is a schematic side view of a four-color sheet-fed rotary printing press incorporating this, and the second part is a section where the ink drying device is installed. FIG. 3 is an enlarged front view, FIG. 4 is a front view of the ink drying device, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG.
The figure is a BB sectional view of FIG. 4, and FIG. 7 is a front view of the shutter. 1...-printing machine, 511...φ paper, 30... ink drying device, 31... housing, 36... infrared lamp, 41...φ-shutter, 44...・Air cylinder, 46”--lever, 48--slide angle, 49-point slide pin. Patent applicant: Koji Printing Machinery Co., Ltd. Jard Co., Ltd. Agent: Masaki Yamakawa (and one other person)

Claims (1)

[Claims] A housing that opens toward the printing paper surface and has a drying heat source installed inside, and a housing that hangs in an open position under its own weight in parallel to the opening of the housing, and in a closed position, the opening is connected between adjacent shutters. a plurality of blind-like shutters that close so as to form a gap; and a drive device that operates in conjunction with the stopping operation of the printing device and closes the plurality of shutters all at once via a connecting member. An ink drying device for a sheet-fed rotary printing press featuring: