JPH04105941A - Perfecting press device - Google Patents

Abstract

PURPOSE:To improve workability by providing a printing part which prints one surface of a printing sheet at a time and delivers the printing sheet to a sheet discharge mechanism in a state that the surface and back and the top and bottom of the sheet are turned over when the sheet is received from a sheet feeding mechanism. CONSTITUTION:When printing is started, printing sheets 49 are fed one by one from the top of a printing sheet bundle 50 to a printing part 25 by means of a feeding mechanism 15, and the printing sheet 49 on the one surface of which printing is applied is discharged onto a sheet discharge table 7 by means of a sheet discharge mechanism 20. In this case, the back and surface and the top and bottom of the printing sheet 49 when it is placed on a sheet feeding table 5 are turned over. When the some number of printing sheets 49, 49... is fed to the printing part 25 from a printing sheet bundle 50 on the sheet feeding table 5, a feed sheet position sensor 12 is turned OFF, a sheet feeding table motor 6 is run forward, and the sheet feeding table 5 is raised. When the sensor 12 is turned ON again, a motor 6 is stopped. When the some number of the printing sheets 49, 49... is discharged to a sheet discharging table 7 and a sheet discharge sensor 13 is turned ON, a motor 8 is reversed, the sheet discharging table 7 is lowered, and when the sensor 13 is turned OFF again, the sheet discharging table motor 8 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The double-sided printing apparatus of the present invention will be described in detail according to the following items.

A. Field of industrial application B. Outline of the invention C. Prior art and its problems (9) Means for solving the problems E. Example [Figures 1 to 5] a. Paper holder [Figures 1 and 4] ] b Paper feeding mechanism [Fig. 1, Fig. 2, Fig. 4 C Paper ejection mechanism [
Figures 1, 2, 4] d Printing section [Figures 1 to 4]
Figure e Operation [Figure 4, Figure 5] 1. Initial state 2 Start of printing [Figure 4 (A), (B) End of single-sided printing [Figure 4 (A), (B), (C ), (D)] Start of back-side printing [Fig. 4 (D), (E); End of double-side printing [Fig. 4 (D), (E), (F)] F. Effects of the invention (A. Industrial) FIELD OF THE INVENTION The present invention relates to a novel double-sided printing device. Specifically, we provide a new double-sided printing device that allows printing on both sides of cut paper (cut paper) without touching the printing paper at all during the process, and also allows the device to be installed compactly. This is what I am trying to do.

(B Summary of the Invention) The double-sided printing device of the present invention prints the printing portion on one side of printing paper at a time, and delivers the printing paper to the paper ejection mechanism with the front and back sides and top and bottom reversed from when it was received from the paper feed mechanism. A paper feed/delivery tray is arranged between a paper feed tray and a paper discharge tray which are vertically spaced apart, and each of these trays has a paper holder provided so as to be vertically movable individually on the same axis. When printing on one side, the paper feed tray is located at the paper feed position, and the paper feed tray is located at the paper feed/delivery position. The printed printing paper is ejected onto the paper feed/delivery tray, and when the predetermined number of sheets have been printed, each of the above-mentioned paper trays moves, and the paper feed/delivery tray returns to the paper feeding position, and the paper output tray returns to the paper feed position. Before starting printing, the paper is placed at each paper ejection position, and the printing paper supplied from the paper feed/delivery tray and printed on the other side by the printing section is ejected onto the paper ejection tray. If you set the printing paper on the paper feed tray, you will not have to remove it from the paper output tray and touch the printing paper at all after printing is completed, and you can print in the printing section between the front and back sides. In addition, there is no need for a special mechanism for reversing the paper, and since the paper is fed and discharged using one paper holder, the installation of the apparatus can be made compact.

(C Prior Art and its Problems) When performing multicolor double-sided printing with a printing device that uses cut paper, -11Q has a mechanism between the printing units to turn the paper upside down. There is a method of printing on both sides at the same time using this. In this case, either the number of printed parts or the total printing color on both sides (i.e., if it is a 4-color printing machine, 3 colors on the front side, 1 color on the back side, 2 colors on the front side, 1 color on the back side,
For example, if you want to print on both sides in 4 colors, you will need an 8-color printing machine, which will make the device complex and large in size.

In addition, in printing machines without a reversing mechanism, it is necessary to take out the ejected paper, invert it, and place it again on the paper feed section. Especially in multicolor printing machines, the paper feed section and the paper ejection section are connected to the printing machine. It is hard work to move the paper at both ends.

(D Means for Solving the Problems) In order to solve the above-mentioned problems, the double-sided printing device of the present invention prints the printing portion on one side of printing paper at a time, and also reverses the front and back sides and top and bottom of the paper when it is received from the paper feed mechanism. A paper feed/delivery tray is arranged between a paper feed tray and a paper discharge tray which are vertically separated, and these trays are arranged on the same axis separately. A paper holder is provided that can move up and down, and when printing on one side, the paper feed tray is located at the paper feed position, and the paper feed/ejection tray is located at the paper ejection position. The printing paper, which has been printed on one side by the printing section, is ejected onto the paper feed/delivery table. When the predetermined number of sheets have been printed, each of the above paper units moves and the paper feed/delivery table is fed. The paper output tray is located at the paper position, and the paper output tray is located at the paper output position, and the printing paper supplied from the paper feed/delivery tray and printed on the other side by the printing unit is discharged onto the paper output tray. This is how it was done.

Therefore, in the double-sided printing device of the present invention, once printing paper is set on the paper feed tray before printing starts, there is no need to touch the printing paper at all until it is removed from the paper output tray after printing is completed. Moreover, since the printing paper can be set on the paper feed tray and the printed matter can be taken out from the paper ejection tray in the paper holder, the production efficiency is good. Furthermore,
It is possible to print between the front and back printing units, there is no need for a special mechanism for reversing the paper, and paper feeding and ejection is done using a single paper holding unit, making the installation of the device more compact. I can do it.

(Embodiment E) [Figures 1 to 5] Details of the double-sided printing apparatus of the present invention will be described below according to the illustrated embodiment.

In the illustrated embodiment, the present invention is applied to a double-sided multicolor gravure printing apparatus 1.

(a Paper holder) [Figures 1 and 4] 2 is a paper holder.

Reference numeral 3 denotes a guide member, which is disposed on the machine frame 4 so as to extend in the vertical direction.

Reference numeral 5 denotes a paper feed tray, which is supported by the guide member 3 so as to be vertically movable. A paper feed tray motor 6 is supported by the machine frame 4, and a wire 6b wound around a pulley 6a fixed to the rotating shaft of the paper feed tray motor 6 is connected to the paper feed tray 5. The paper feed table 5 is moved up and down by the drive of the paper feed table motor 6.

Reference numeral 7 denotes a paper feed/discharge table, which is supported by the guide member 3 above the paper feed table 5 so as to be vertically movable. Reference numeral 8 denotes a paper feed/discharge table motor, which is supported by the machine frame 4 and has a wire 8 wound around a pulley 8a fixed to the rotating shaft of the paper feed/discharge table motor 8.
b is connected to the paper feed/discharge table 7, and the paper feed/discharge table 7 is moved up and down by the drive of the paper feed/discharge table motor 8.

Reference numeral 9 denotes a paper discharge tray, which is supported by the guide member 3 above the paper feed and discharge tray 7 so as to be vertically movable. Reference numeral 10 denotes a paper delivery tray motor, which is supported by the machine frame 4, and a pulley 10ak (wound wire) Ob connected to the paper delivery tray 9, which is fixed to the rotating shaft of the paper delivery tray motor 10. The paper delivery table 9 is moved up and down by the drive of the paper delivery table motor 10.

Reference numeral 11 denotes a lower limit sensor for detecting the lower limit of the paper feed table 5; 12 a paper feed position sensor for detecting the paper feed position; 1;
3 is a paper discharge position sensor for detecting the paper discharge position, and 14 is an upper limit sensor for detecting the upper limit of the rise of the paper discharge tray 9. These sensors 11, 12, 13 and 14 may be either contact type such as microswitches or non-contact type such as photointerrupters.

The suction unit 16 includes a suction head 18b supported at one end of a rotatable support body 18a.

Reference numeral 19 denotes a rotating motor for the suction section 16, which connects the rotating end of a crank 19a fixed to its rotating shaft and the support 18a.
is connected to the other rotating end of the rod 19b. Accordingly, the bow suction unit 16 is driven by the rotation motor 19, so that the suction bow head 18b is moved to the paper feed table 5 or the paper feed/discharge table 7.
It is rotated between a closed position facing the top surface of the paper feed tray 5 and an open position which is out of the vertical movement locus of the paper feed tray 5 and the paper feed/delivery tray 7.

(b, Paper feeding mechanism) [Figures 1, 2, and 4] Fig. 15 is a paper feeding mechanism that supplies printing paper from the paper feeding tray 5 or paper feeding/discharging tray 7 to the printing section, which will be described later. A suction unit 16 takes out the topmost printing paper stacked on the paper table 5 or the paper supply/discharge tray 7, and a conveyance heald 17 transports the printing paper taken out from the suction unit 16 to the printing unit. We are prepared.

(C Paper discharge mechanism) [Figures 1, 2, and 4] Fig. 2 shows a paper discharge mechanism, which includes a paper discharge chain 22 supporting paper discharge molds 21, 21, . . . , a paper discharge heald 23, and a paper discharge mechanism. A paper roller 24 is provided.

The printing paper printed by the printing section, which will be described later, is carried by the paper ejection molds 21, 21, . The paper is discharged onto the paper feed/discharge tray 7 or the paper discharge tray 9.

(d Printing Department) [Figures 1 to 4] 25 is a printing section.

The printing section 25 has four partial printing sections, that is, a C (cyan) partial printing section 25C, an M (magenta) partial printing section 25M, and Y.
The (yellow) partial print section 25Y and the B (black) partial print section 25B are arranged in this order from bottom to top.

And the above partial printing parts 25C125M125Y, 25
A drying conveyor section 26, 26, 26 is arranged between each of the sections B.

Each of the partial printing units 25C, 25M, 25Y, and 25B includes a plate cylinder 27, an impression cylinder 28 that is in pressure contact with the plate cylinder 27, and an ink tank that stores ink in which a part of the plate cylinder 27 is immersed. It is equipped with 29.

Then, the C portion printing section 25C is printed by the paper feeding mechanism 15.
The leading edge of the printing paper fed to the printing paper is held by the paper jack 28a of the impression cylinder 28, and the rotation of the impression cylinder 28 (
The direction of rotation is indicated by an arrow. ), it passes between the impression cylinder 28 and the plate cylinder 27, and at this time, a cyan portion is printed on the surface facing the plate cylinder 27.

The printing paper on which the cyan part was printed is in the C part printing section 2.
It is passed from the impression cylinder 28 of 5C to the drying conveyance section 26, and is delivered by the drying conveyance section 26 to the impression cylinder 28 of the M section printing section 25M, where the M section is printed. In the same manner, printing of the Y portion and B portion is performed sequentially, and the printing paper after printing of the B portion is transferred from the impression cylinder 28 of the B portion printing section 25B to the paper ejection chute 2 of the paper ejection mechanism 2o.
The paper is delivered to the paper ejection claw 21.21 supported by the paper 2.22.

Since each drying conveyor 26, 26, 26 has a similar structure, one of them will be described in detail.

Reference numeral 30 denotes a support shaft fixed to the machine frame 4 by a fixing means (not shown), which is formed into a hollow cylindrical shape, with one end 31 open and enlarged in diameter into a trumpet shape, and the other end 32 closed. .

A large number of air blowing holes 33, 33, .

Reference numeral 34 denotes a blower fan, which is disposed at the open end of the enlarged diameter portion 20 of the support shaft 30. When the blower fan 34 is driven, air is forced into the support shaft 30, and the support shaft 3
The air pumped into the air outlet 33, 33, and
It is blown out from...

35 is a paper wheel rotatably supported by the support shaft 30.

36a, 36b, and 36c are rotary cylinders, the inner diameter of which is slightly larger than the outer diameter of the support shaft 30. The central rotary tube 36b is formed shorter than the other rotary tubes 36a and 36c.

37. 37. 37 is an arm, and the central ring part 38.
38. Arm pieces 39 from positions 180° apart from each other in 38.
．． 39, . . . project in opposite directions.

And the ring part 38.38 of each arm 37.37.37
．． 38 are externally fitted and fixed to the rotary cylinders 36a, 36b, 36c, respectively, and each arm piece 39, 39, 39, 39, 39.
39 are integrally connected by a connecting rod 40.40, thereby each arm 37.37.37 and rotating cylinder 36a
136b and 36c are integrally connected.

41.41, . . . are paper clipping claws rotatably supported at the tips of the arm pieces 39.39, . 41 and 41
．． 41.41 are integrally connected by connecting rods 42.42.

43.43 is a cam piece fixed to one end of the connection 'pJ42.42, and this cam piece 43.43 is controlled by a cam (not shown) according to the rotation of the paper spinner 35, and the paper is rotated at a predetermined timing. The pinching claws 41, 41, . . . are opened and closed.

The rotary cylinders 36a, 36b, 36c of the paper spinner 35 thus formed are rotatably fitted onto the support shaft 30, and the rotary cylinders 36a, 36c are attached to the machine frame 4 via bearings 44.44. Rotatably supported.

Reference numeral 45 denotes a flat gear fixed to one end of the rotary cylinder 36a, and the flat gear 45 is meshed with an output gear of a drive section (not shown), and the drive section moves the paper imitation 35 at a predetermined timing and speed. It is designed to be rotated.

Reference numeral 46 denotes a guide plate, which has a substantially semi-cylindrical shape, and has an arcuate concave surface 47 or a guide surface, and the guide surface 47 is formed by the air blowing holes 33, 33, . . . of the support shaft 30. The arm 37 of the paper spinner 35 is opposed to the formed portion.
It is located a little far from the rotation locus of the tip of arm piece 39.39, . . . of 37.37.

Therefore, in the dry conveyance section 26, the leading edge of the printing paper that has been printed in the previous partial printing section (25C125M or 25Y) comes off the paper chuck 28a of the impression cylinder 28, and the paper clipping claws 41, 41 of the paper spinner 35 .41 and arm piece 39.
39. When the paper spinner 35 is rotated in the direction shown by the arrow, it is conveyed to the next partial printing section (25M, 25Y or 25B) and the impression cylinder 28 The paper chuck 28a of
It is released from 1.

Air 48, 48 is blown out from the air blowing holes 33, 33, . . . of the support shaft 30 onto the printing surface of the printing paper.
, .
The flow passes from both left and right ends of the flow guide plate 46 to the left and right along the printing surface of the printing paper, which has an arcuate concave surface along the line 7 .

Therefore, nothing touches the printing surface of the printing paper while it is being transported by this drying transport section 26,
In addition, air blowing holes 33, 33 of the support shaft 30 are provided on the printing surface,
The drying of the ink on the printing surface is accelerated by the air blown out from the ... and flowing along the printing surface, and the printing in the next partial printing section is carried out within an extremely short conveyance section. You can get as much ink drying as you can tolerate.

(e Operation) [FIGS. 4 and 5] Next, the operation of the double-sided multicolor gravure printing apparatus 1 described above will be explained with reference to FIGS. 4 and 5.

(e-1 initial state) First, to start printing, print paper 4 is placed on paper feed table 5.
9. Set bundle 5o of 49,...

Further, the suction section 16 of the paper feeding mechanism 15 is in the closed position.

Then, the paper feed table motor 6 is driven and the paper feed position sensor 1
2, the upper end of the printing paper bundle 50 set on the paper feed table 5 is detected. In the operation timing diagram of FIG. 5, ronJ indicates when each sensor 11, 12, 13, 14 is detecting the presence of a detection target, and "Off" indicates when not.

Further, the paper feed/discharge tray 7 is located slightly below the position where the paper discharge position sensor 13 detects this, and the paper discharge tray 9 is located at the upper limit sensor 14.
is located slightly below the position where this is detected.

The above state is the initial state.

(e-2, start printing) [Fig. 4 (A), (B)] When printing starts, the printing paper 49 is loaded one by one from the top of the printing paper stack 50 placed on the paper feed table 5. is the paper feed mechanism 15
The printing paper 49 is supplied to the printing unit 25 by the printing unit 25, and the printing paper 49, which has been printed on one side by the printing unit 25, is discharged onto the paper feed/discharge table 7 by the paper discharge mechanism 2o (FIG. 4(A),
(See (B)). The printing paper 49 is placed on the paper feed/discharge tray 7 with the front and back sides and top and bottom reversed from when it was on the paper feed tray 5.

Then, when some sheets of printing paper 49, 49, . As a result, the paper feed tray motor 6 rotates forward, the paper feed tray 5 rises, and when the paper feed position sensor 12 is turned on again, the paper feed tray motor 6 stops. Also, when some sheets of printing paper 49, 49, . Then, the paper feed/discharge tray 7 moves backward, and when the paper discharge position sensor 13 turns off again, the paper feed/discharge tray motor 8 stops.

(e-3, End of single-sided printing) [Figure 4 (A), (B),
(C), (D)] The above operations are repeated and the printing paper 49.49,
... is printed on one side (see Figure 4).
A)-(B)), the printing of a predetermined number of sheets is completed (the number of times that the paper feed tray 5 is raised and the paper feed/delivery tray 7 is lowered is counted, and it is determined whether the number of times has reached the predetermined number. .)
Then, the rotation motor 19 is driven, and the suction section 16 of the paper feeding mechanism 15 moves to the open position (see FIG. 4(C)).
.

Then, the paper feed tray motor 6, the paper feed/delivery tray motor 8, and the paper discharge tray motor 10 are respectively reversed to lower the paper feed tray 5, the paper feed/delivery tray 7, and the paper output tray 9, respectively, and the lower limit sensor 11
When the paper feed tray motor 6 is detected (ON), the paper feed tray motor 6 is turned on.
When it crosses the paper output tray 9 or the paper output position sensor 13 (when it is turned on and then turned off again), the paper output tray motor 0 is stopped, and the paper output tray 7 and its When the stack of printing papers 49, 49, . Stop.

When the movement of the number table 5, 7, and 9 described above is completed, the rotating motor 19 is driven to return the suction section 6 of the sheet feeding mechanism 15 to the closed position (see FIG. 4(D)). This completes the preparation for printing on the back side.

(e-4 Start of printing on the back side) [Fig. 4 (D), (E)] When printing on the back side starts, the top of the printing paper stack 50' placed on the paper feed/discharge table 7 is Printing paper one by one from 49
Either the printing paper 49 is supplied to the printing unit 25 by the paper feeding mechanism 15, and the other side (back side) is printed by the printing unit 25, or the printing paper 49 is discharged onto the paper output tray 9 by the paper discharge mechanism 20 (the first (See Figure 4 (D)).

Then, when some sheets of printing paper 49, 49, . As a result, the paper feed/discharge table motor 8 rotates forward and the paper feed/discharge table 7 rises.
When the paper feed position sensor 12 turns on again, the paper feed/discharge table motor 8 stops. Also, when some sheets of printing paper 49, 49, . . . When the paper ejection tray 9 is lowered and the paper ejection position sensor 13 is turned off again, the paper ejection tray motor 10
or stop.

(e-5, end of double-sided printing) [Figure 4 (D), (E),
(F) The above operations are repeated and the printing paper becomes 49.49,
When the printing on the other side (back side) of .

Therefore, when the printed sheets 49, 49, .
The suction part 16 of the holder 16 rotates to the open position, and then each holder 6.8.1o is rotated in the normal direction to raise the stand 5.7.9.
The upper end of the printing paper stack 5o placed on the paper feed tray 5 crosses the paper feed position sensor 12, and when this is turned on, the paper feed tray motor 6 stops, and the paper feed tray 7 When the paper ejection position sensor 13 is turned on, the paper feed/ejection tray motor 8
When the rotation is reversed and the paper discharge position sensor 13 is turned off, the paper feed/discharge table motor 8 stops. Furthermore, the paper ejection table motor 1
0 is reversed when either the paper discharge tray 9 or the upper limit sensor 14 is turned on, and stops when the upper limit sensor 14 is turned off.

Then, when each of the above sounds S and 7.9 0 movement is completed, the suction section 16 of the paper feed mechanism 15 returns to the closed position,
As a result, an initial state for the next printing appears (see FIG. 4(F)).

(F. Effect of the invention) As is clear from the above description, the double-sided printing device of the present invention has a paper feed tray and a paper discharge tray disposed between a paper feed tray and a paper discharge tray that are vertically spaced apart. a paper holding section that is separately movable up and down on the same axis, and a paper feeding mechanism that supplies printing paper to the printing section from a paper feeding table or a paper feeding/discharging table;
A paper ejection mechanism that ejects the printing paper printed in the printing section onto the paper ejection tray or paper feed/delivery tray, and a paper ejection mechanism that prints on one side of the printing paper and turns it upside down and upside down from when it is received from the paper feed mechanism. The paper ejection mechanism is equipped with a printing unit that delivers printing paper, and when marking one side W11, the paper feed tray is at the paper feeding position, and
It is located at the paper feed/discharge table or the paper ejection position, and the printing paper that is supplied from the paper feed tray and printed on one side by the printing unit is ejected onto the paper feed/discharge table, and the predetermined number of sheets are printed on the paper feed/discharge table. When printing is completed, each of the above sounds will move and the paper feed/delivery tray will be at the paper feed position, and
It is characterized by being located at a paper output tray or a paper discharge position, respectively, so that the printing paper supplied from the paper feed/discharge tray and printed on the other side by the printing unit is discharged onto the paper output tray. shall be.

Therefore, in the duplex printing apparatus of the present invention, if printing paper is set on the paper feed tray before printing starts, it is not necessary to touch the printing paper at all afterward until it is removed from the paper output tray when printing is completed. In addition, since printing paper can be set on the paper feed tray and printed matter can be taken out from the paper ejection tray using the paper holding section (-), the workability is good. Furthermore,
Printing can be performed using the same printing section on both sides, no special mechanism is required for reversing the paper, and paper is fed and discharged using one paper holding section, making the installation of the device compact. I can do it.

In the above embodiments, the present invention is applied to a multicolor gravure printing device, but this does not mean that the scope of application of the present invention is limited only to a double-sided multicolor gravure printing device, and various applications are possible. Needless to say, the present invention can be applied to a double-sided printing apparatus. Moreover, it goes without saying that the present invention can be applied not only to multicolor printing apparatuses but also to monochrome double-sided printing apparatuses.

In addition, the specific shapes and structures shown in the above embodiments are merely examples of embodiments of the present invention, and the technical scope of the present invention should not be construed as limited by these. must not.

The drawings show an example of an embodiment in which the double-sided printing device of the present invention is applied to a double-sided multicolor gravure printing device, in which FIG. 1 is a schematic diagram of the whole, FIG. 2 is a schematic perspective view of the printing section, and FIG. FIG. 4 is a schematic side view showing the printing operation sequentially from (A) to (F), and FIG. 5 is an operation timing chart.

Explanation of symbols 1...Double-sided printing device, 2...Paper holding section, 7... Paper feed/delivery table, 15...Paper feeding mechanism, 25...Printing Department, 5...Paper feed tray, 9...paper output tray, 20... paper ejection mechanism, 49...printing paper Out wish Man Soni KK formula

[Brief explanation of drawings]

Claims (1)

[Claims] A paper feed/delivery tray is arranged between a paper feed tray and a paper discharge tray which are spaced apart from each other in the vertical direction, and each of these trays is provided with a paper holder and a paper feed tray each of which is movable up and down on the same axis. Or, a paper feed mechanism that supplies printing paper from the paper feed/discharge table to the printing section, a paper discharge mechanism that discharges the print paper printed in the printing section onto the paper discharge tray or the paper feed/discharge tray, and a single-sided paper feed/discharge mechanism for the printing paper. The printer is equipped with a printing unit that prints sheets one by one and delivers the printing paper to the paper ejection mechanism after being turned upside down and upside down from when it is received from the paper feeding mechanism, and when printing on one side, the paper feeding tray is in the paper feeding position, Also, the paper feed/discharge table is located at the paper ejection position, and the printing paper supplied from the paper feed table and printed on one side by the printing unit is ejected onto the paper feed/discharge table, and is placed in a predetermined position. When the printing of the number of sheets is completed, each of the above units moves, and the paper feed/delivery tray is located at the paper feeding position, and the paper ejection tray is located at the paper ejection position. A double-sided printing device characterized in that printing paper on which side printing has been performed is discharged onto a paper discharge table.