JPS5931407Y2 - Double-sided printing machine capable of offset printing and thermal carbon printing for copying at the same time. - Google Patents

Description

[Detailed description of the invention] The present invention combines offset printing on the front side of a sheet of paper used as a copy slip, and thermal-bon printing for copying on the back side, and also with accurate printing on the front and back sides. Regarding the improved double-sided printing machine.

In general, it is known that thermal carbon printing is performed on the back side of a copy of a copy of a copy of a slip using a dedicated carbon printing machine in order to save the trouble of inserting carbon paper into a copy of the slip.

However, in this thermal carbon printing, in order to prevent the heat-melting component in the carbon ink from sticking during printing, a heater is built into the plate cylinder, etc.
The ink reservoir, ink roller, plate surface, and other parts to which ink is attached must all be heated to a temperature above the melting point of the ink.

This is a unique requirement for thermal carbon printing.

On the other hand, offset printing machines for multicolor printing using sheet-fed paper or long-colored paper, and even offset printing machines for double-sided printing are also known; etc.), a dampening device for the plate cylinder is essential, and a special feature is that a small amount of moisture must be supplied to the plate surface immediately before inking.

However, it is not the case that only multi-color printing or double-sided printing is performed using a dedicated offset printing machine, but if one tries to perform thermal carbon printing at the same time as offset printing using a double-sided printing machine (-b), the above-mentioned carbon plate Due to heat conduction from the cylinder, etc., the dampening effect that corresponds to the offset cylinder is inhibited.
This can cause subtle changes or adverse effects on the drying and hue of the off-cent ink, and for example, an early shortage of dampening water can easily cause weakening of printed lines and staining of the plate surface. Such problems become more and more noticeable especially when it is desired to downsize or increase the speed of the printing press.

Due to the technical reasons mentioned above, a double-sided printing machine that can perform offset printing on the front side and thermal carbon printing on the back side at the same time has not yet been put into practical use.

Therefore, at present, offset printing is first performed on the front side of sheet paper or long roll paper using a common offset printing machine, and then carbon printing is separately performed on the back side using a carphone printing machine, or carbon printing is performed separately on the back side of the paper using a carphone printing machine. The current situation is that paper copies are purchased and only offset printing is performed on the surface using a special offset printing machine to create copy slips and the like.

However, the former method requires two printing machines,
The creation of such copy slips imposes an unnecessary economic and operational burden on the user.

Moreover, as a result of printing the front and back sides using separate dedicated printing machines, it is extremely difficult to accurately print both the front and back sides to accommodate the required copy area, especially when spot carbon printing is performed.

This difficulty in reprinting is exactly the same in the latter method, and due to the discrepancy, copy slips and the like may have fatal defects.

The present invention satisfies the unique requirements of offset printing and thermal carbon printing, and is capable of both offset printing on the front side of sheets such as copy slips and thermal carbon printing on the back side. This double-sided printing machine was devised to enable high efficiency and accurate printing on both sides.This solved the above problems and also improved the printing process associated with thermal carbon printing. The curling tendency of sheets can be automatically corrected, and it can be provided as a particularly useful feature for spot carbon printing.

Hereinafter, the configuration of the present invention will be specifically explained based on the illustrated embodiment. In FIG. 1 showing the overall mechanism,
O is an offset printing section on the surface of a sheet of paper such as a copy slip, and a total of three cylinders, a printing cylinder 1, a blanket cylinder 2, and a pressure cylinder 3, are arranged in an abbreviated shape that makes the printing surface easy to see. ing.

Needless to say, a metal planar plate is wound around the offset plate cylinder 1, and water is first applied to this plate surface by a dampening device 4, and then ink is applied by an inking device 5 facing from above.

Since the plate cylinder 1 mentioned above is rotating in contact with the blanket cylinder 2 at its lower part, the image lines on the plate surface are transferred to the surface of the rubber blanket.

When a sheet P such as a copy slip is fed from the automatic paper feed tray 6 by the universal formal feeder, this is caught by the claw of the offset pressure cylinder (30), and as it rotates, the surface of the sheet P is The image on the rubber blanket is now transferred, and the desired offset printing is completed at the contact point a between the blanket cylinder 2 and the pressure cylinder 3.

C is a thermal carbon printing section for copying arranged on the back side of the sheet P, especially a spot carbon printing section, which includes a low-temperature carbon plate cylinder 1, a replaceable carbon rubber roller 8, and a carbon plate 9. , and a heater 10 that heats the carbon plate 9. By heating, the carbon ink in the plate 9 is dissolved into a liquid state.

Although not shown, the carbon plate cylinder 1 has a built-in heater for elevating the plate surface, and also has a rubber relief plate for spot carbon printing affixed to a part of its surface.

In this case, in the case of ordinary carbon printing in which the entire back side of a sheet is so-called peta-printed, it goes without saying that the rubber letterpress printing plate may be wrapped around the entire plate cylinder 1.

In addition, in 11.12, the sheet holder inserted between the pressure cylinder 3 of the offset printing section O and the pressure cylinder 13 of the thermal carbon printing section C is an even number of cylinders. In the figure, there are two in total, which contributes to the miniaturization of the printing press itself.

These transfer cylinders 11 and 12 take the sheets P, which have been offset printed on the front side, by an even number of sheets and turn them face down, so that thermal carbon printing is carried out by the carbon plate cylinder γ on the back side. In particular, in addition to the action of transporting the sheet P to perform spot carbon printing, the heat of the thermal carbon printing section C is transferred to the offset printing section 0.
This arrangement is intended to prevent the dampening action of the dampening device 4 from being transmitted to the dampening device 4 and causing light damage.

In this respect, in Fig. 1, the two supports are the transfer cylinders 11.1.
2, including the carbon pressure cylinder 13, are installed in an abbreviated arrangement, the details of which are not shown, but both are placed between the left and right disks. A plurality of receivers are provided with gripping claws on a gripper bar horizontally suspended on the circumferential body, and the sheets P are reversely transferred in the direction of the arrow in FIG.

The carbon pressure cylinder 13 is located diagonally below the plate cylinder 1 and is rotated in contact with the plate cylinder 1.

Note that this version cylinder γ is the carbon pressure cylinder 1 mentioned above.
Of course, it is possible to approach and separate from 3.

As is clear from the arrows in FIG. 1, the sheet P whose surface is first offset printed in the offset printing section O is then moved from the pressure cylinder 3 of the offset printing section 0 to the starting end cylinder 11 and the terminal end side. The catch by the gripping claw of the cylinder 12 is transferred to the pressure cylinder 13 of the carbon printing section C in a meandering manner, and in the process it is reversed and the carbon pressure cylinder 13 and the carbon printing cylinder are transferred. At the point of contact with 1, thermal carbon printing, especially spot carbon printing, will be performed on the back side.

At that time, it goes without saying that the carbon ink must first be transferred to the rubber letterpress of the plate cylinder 1 via the rubber roller 8 (.

Reference numeral 14 denotes a paper-receiving cylinder, which rotates in contact with the pressure cylinder 13 of the carbon printing section C diagonally from below, and carbon-receives the sheet P immediately after thermal carbon printing has been performed on the back side. It functions to take a receiver from the pressure cylinder 13 with its gripping claw and feed it to the gripping claw of the endless chino 15.

Thereafter, the sheets P are sent to the paper delivery stand 16 as the chino 15 circulates, and are automatically delivered face up into the paper delivery stand 16 in a tidy manner.

In this case, the sheet P that has just been carbon-printed on the back side in the thermal carbon printing section C will exhibit a curled state with a certain bending tendency due to the heat, and the paper-receiving cylinder will be placed in the drum. 14 is arranged to contact and rotate diagonally below the carbon pressure cylinder 13 as shown in FIG. It plays the role of keeping the paper P in a non-curled state with its curls corrected.
In addition to ensuring smooth and reliable feeding and transfer by the checker 715, the sheets can be discharged onto the paper discharge table 16 in a neatly stacked state with the front facing up well.

In other words, the paper take-up cylinder 14 is arranged to have the function of forcibly restoring and correcting the curled state of the sheet P that occurs due to thermal carbon printing during its transportation.

Furthermore, in Fig. 1, U is a unit for printing multicolors on the surface of a sheet P in one process in conjunction with the offset printing described above, and its left and right = phantom inverted characters that can be swiveled. An inking device 18 and a letterpress printing cylinder 19 are installed above the mold frame 1γ.

Furthermore, as is clear from FIG.
It can be inserted into and removed from the recess 21 formed in 1 from above,
In other words, they are loosely locked in a recessed manner.

22 is a number printing device that can be inserted into the rotating shaft 20 in exchange for the letterpress printing cylinder 19, and if this is included in the unit U, the numbers can be printed on the surface of the sheet P at once. Go to.

In this regard, FIG. 2 shows an example in which the rotary support shaft 20 is also used to attach both a number printing device 22 and a letterpress printing cylinder 19 equipped with a small rubber letterpress plate for multicolor printing.

Letterpress printing cylinder 19 and number printing device 2 as described above
2, or the cylinder 19 or number printing device 2
2, the frame 11 of the unit H is swingable, and its letterpress printing cylinder 19 and/or number printing device 22 is moved toward and away from the pressure cylinder 3 of the offset printing section 0. This can be achieved through a flexible configuration.

In other words, regarding the letterpress printing cylinder 19 shown in FIG. 1, the cylinder 19 can contact and rotate from the lateral direction with respect to the pressure cylinder 3 of the offset printing section O, and the contact point between the two is Letterpress printing in other colors is done in d.

In this case, contact and release are performed by frame 1 of unit U.
This can be achieved by operating an operating handle (not shown) protruding from the middle of γ to swing the frame 1γ around the lower pivot point e.

In addition, in the figure, 23 is a mount ring of the number printing device 22, M is a motor, and 24 is a flywheel that is rotationally driven from the motor M through belt transmission. The rotational power that enters the transfer cylinder 11 is transmitted to the remaining cylinders 12, 13 and cylinders 1, 2, and 3 through the gear engagement.
, 7, 14, 19, and Che 715 should all be rotated at a constant speed.

The letterpress printing cylinder 19 of unit U is also rotated at the same speed as the offset pressure cylinder 3.

As described above, the present invention is a double-sided printing machine capable of thermal printing for copying at the same time as offset printing. The sheet P is transferred face-down and inverted between the cylinder 3 and the pressure cylinder 13 of the carbon printing unit C, which prints thermal carbon on the back side of the sheet P after printing, and offsets the sheet P. Since the receiver to isolate the printing part O and the carbon printing part C so that their heat cannot be conducted is an even number of transfer cylinders 11 and 12 installed, the problem mentioned at the beginning can be solved. It is possible to perform off-cent printing on the front side and thermal carbon printing on the back side with high efficiency at the same time using the → printing machine, which is extremely useful for the production of copy slips and the like.

That is, considering the unique requirements of offset printing and thermal carbon printing, the offset printing area C and the carbon printing area C are separated, so that the carbon ink on carbon printing is heated and the plate surface is heated. Although the pressure is moderately reduced to 1, this prevents the negative effects of offset printing on the plate surface dampening effect, and is therefore effective in high-precision double-sided printing of copy slips and the like.

Furthermore, as a means of achieving this isolation, the even number of receivers is removed from the cylinder 11. 12 is used, and these are installed between the filtration pressure cylinders 3°130 in both open printing sections O and C, so there is no printing error on both the front and back sides, and therefore, there is no problem with spot carbon. This is extremely effective when printing.

In this regard, if the sheet P is transported by an endless chain and is inserted between the two open printing units O and C, the longer the chain is, the easier it is to loosen.
Since there will be an error in the amount of paper to be fed, especially when applied to the printing of copy slips, the printing of both the front and back sides that corresponds to the necessary copy portion will be incorrect, making it difficult to ensure accuracy, and the copy slip will be printed incorrectly. As such, it has a fatal flaw.

According to the present invention, in addition to the above-mentioned effects, such problems can also be solved, and this can also be achieved by printing on both sides of the sheet P while it is being transported using a single printing machine. become.

Further, the transfer cylinders 11 and 12 not only transport the sheets P, but also serve as filter pressure cylinders 3 in the above-mentioned double spread printing sections 0 and C for subsequent thermal carbon printing as an even number of sheets P. , 130 are inserted between each other to turn the sheets P upside down.For example, the receiver of a unit type offset printing press that prints multicolor only on the front side is different from the transfer cylinder arrangement, and the arrangement of the transfer cylinder is different from that of the present invention. It is said that this is something that works uniquely to double-sided printing machines.

Furthermore, in the present invention, the pressure cylinder of the carbon printing part C
13, in addition to the plate cylinder 1, a paper-receiving cylinder 14 for straightening and pressing the sheet P, which has been bent due to the heat after carbon printing, to its original shape, is also arranged so as to rotate in contact with the paper cylinder 14. Therefore, after double-sided printing is completed, the sheets P should be kept in their original non-curled state, and the subsequent paper ejection operation becomes smooth and reliable, and there is also the effect that they can be stacked in an orderly state with the front side facing up. .

This is unique to thermal carbon printing, and in this respect, for example, when the contact point of the carbon printing section C is used to immediately discharge the sheet P from the pressure cylinder 13 after carbon printing, the above-mentioned It is not possible to obtain a correction effect.

In addition, as in the illustrated embodiment, the pressure cylinder 3 of the offset printing section O is also attached, and a unit U that can be freely approached and separated is attached thereto, and its number printing machine 22, letterpress printing cylinder 19, etc. If letterpress printing is also allowed, it will be possible to perform multi-color printing and number printing on the surface of the sheet P using the same printing machine, making it possible to provide an even more versatile printing machine. Practical ideas and g
-Ero.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the overall mechanism of the present invention, and FIG. 2 is an exploded perspective view showing two parts of the letterpress printing unit. DESCRIPTION OF SYMBOLS 1...Offcent version cylinder, 3...Offcent pressure cylinder, 1...Carbon version cylinder, 111
2.13... Rotating body with claws for receiving images, 14... Paper take-up cylinder, O... Offcent printing section, C... Thermal carbon printing section, P... Sheet paper.

Claims (1)

[Scope of utility model registration request] The pressure cylinder 3 of the offset printing unit O prints offsets on the front side of the sheet P for copying slips, etc., and the pressure cylinder 3 of the carbon printing unit C prints thermal carbon on the back side of the sheet P after printing the offset on the front side. The transfer cylinder 11. is a receiver for transferring the sheet P face down and inverted between the cylinder 13 and isolating the offset printing section O and the carbon printing section C so that their heat cannot be conducted. 12 are inserted in an even number, and the plate cylinder 1 is arranged in line with the pressure cylinder 13 of the carbon printing section C, and the sheet P, which has been bent due to the heat after carbon printing, is turned face up into its restored state. paper cylinder 14 for straightening press
What is claimed is: 1. A double-sided printing machine capable of simultaneously performing off-cent printing and thermal power-bon printing for copying, characterized in that the two sides are arranged so as to rotate in contact with each other.