JP3053701B2 - Rotary transfer printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary copying machine, and more particularly, to a rotary copying machine having a mechanism for finely adjusting a horizontal printing position on printing paper.

[0002]

2. Description of the Related Art In general, in a rotary transfer printing press, the front and rear directions of the printing paper in the traveling direction are called top and bottom, and the direction perpendicular to the paper is called the horizontal direction. In a conventional rotary printing press, to change the printing position in the horizontal direction, the position of the paper supplied onto the printing drum is shifted left and right. Therefore, for example, in a printing press having a plurality of paper feed trays, all the paper feed trays have to be positioned for adjusting the fine horizontal movement. Further, in the receiving section where the printed sheet is discharged and received, the position of the receiving section is finely adjusted in accordance with the position of the sheet feeding tray. Further, if the movement width of the fine adjustment is 10 mm on the left and right, the size of the printing paper itself must be further provided with a width of 10 mm, which leads to an increase in the size of the entire printing press.

On the other hand, proposals have already been made to move the printing drum in the axial direction as a whole, including the ink application mechanism inside the printing drum. However, since the ink supply roller and the press roller are originally arranged so as to be mechanically balanced, when the ink applying mechanism is moved together with the print drum, a force is applied to the press roller by an amount corresponding to the movement of the ink supply roller. The condition becomes unbalanced.
As a result, the familiarity of the ink becomes non-uniform, and it becomes difficult to perform uniform printing on the entire paper surface.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems, and has been devised to effectively solve the problems. Accordingly, it is an object of the present invention to enable fine adjustment of the printing position in the lateral direction by allowing the position of the printing drum to be fine-adjustable and movable in the axial direction without changing the position of the printing paper. The object is to achieve simplification of operation by only the printing drum of the drive system, and to achieve downsizing of the printing press by eliminating the necessity of taking the moving width of the printing paper. Further, since only the drum is moved without moving the ink applying mechanism in the printing drum, the pressure of the press roller does not act as an uneven load on the ink applying mechanism.

[0005]

SUMMARY OF THE INVENTION A rotary copying machine according to the present invention has the following arrangement in order to solve the above-mentioned problems of the prior art and to achieve the object. That is, a printing drum on which a base paper is mounted, an ink applying means provided in the printing drum and supplying ink to the printing drum, and a press roller which circumscribes the printing drum and presses the printing drum. In the rotary transfer printing press provided, the printing drum is configured to be movable in the axial direction with respect to the press roller and the ink applying means, and is provided with driving means for moving the printing drum in the axial direction.

[0006]

In the rotary copying machine according to the present invention, the printing drum is moved in the axial direction by the driving means. By moving the printing drum in the axial direction with the base paper loaded, the printing position of the printing paper in the horizontal direction is finely adjusted. In other words, when adjusting the printing position, the position of the base paper is changed by moving the printing drum in the horizontal direction instead of changing the position of the printing paper. The apparatus can be downsized while having the print position fine adjustment mechanism. Also, since the printing drum moves in the axial direction independently of the ink applying means, the positional relationship between the roller of the ink applying means and the press roller which receives the pressing force of the press roller changes when the printing drum moves in the axial direction. do not do. Therefore, the balance of the pressing force of the press roller acting on the roller of the ink applying means is not disturbed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary printing machine according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory diagram showing a schematic configuration of a rotary copying machine according to the present embodiment. In the figure, 1 is a printing drum, 2 is a press roller, 3 is a stencil discharging mechanism, 4 is a stencil roll, 5 is a plate making thermal head, 6 is a stencil made, 8 is a press roller driving mechanism,
9 _1, 9 _2, 9 ₃ each print sheet tray, 10 paper feed mechanism section, 11 paper discharge receiving portion, 12 is a document reading unit.

On the printing drum 1, a base paper clamper 13 for receiving the base paper produced by the thermal head 5 and gripping the leading end of the base paper, and the leading end of the base paper discharged after the target printing is completed. A base paper jumping lever 14 to be introduced into the base paper discharge mechanism 3 is attached. Although not shown in FIG. 1, the printing drum 1 has an ink application mechanism built therein, and the drum 1 on which the base paper is mounted has ink between the surface of the drum 1 and the base paper from the inside. Is supplied. The plate making is performed by the original reading unit 12.
The printing is performed by the thermal head 5 supplied based on the image signal scanned in step (1), and a plate of the original image is formed on the thermal base paper. It should be noted that the pre-processed base paper 6 is in a standby state as shown in the drawing until the used base paper on the printing drum 1 on which printing has been completed is discharged from the drum 1.

The press roller 2 has the same diameter as the print drum 1 and has a drive mechanism 8 as a drive system independent of a drive system (not shown) for the print drum 1. It is configured to rotate in synchronization. The press roller 2 has a relief recess 1 at a position corresponding to the base paper clamper 13 and the base paper flip-up lever 14 on the drum 1.
5, so that the roller 2 does not interfere with the clamper 13 or the lever 14 when the roller 2 rotates synchronously with the drum 1. In the recess 15, a locking claw 16 for locking the printing paper fed from the paper feeding mechanism unit 10 toward the roller 2 at a leading end thereof is provided.

The printing paper is composed of three printing paper trays 9 ₁ ,
9 ₂ are stocked in each paper size is divided into 9 _3,
The printing paper of the selected desired size is sent from each paper tray to the press roller 2
It is sent out one by one. Since the press roller 2 rotates while the leading end of the printing paper is locked by the locking claw 16, the printing paper is sequentially sandwiched between the printing drum 1 and the press roller 2 and printed. The printed sheet is held on the peripheral surface of the press roller 2 and rotated without sticking to the printing drum 1 because the leading end of the sheet remains locked by the locking claw 16. Then, when the paper comes to the position just before the paper discharge roller 17, the locking claw 16 is unlocked, so that the sheet is released from the locking claw 16 and is discharged to the paper discharge receiving portion 11 via the discharge roller 17.

Although not shown in FIG. 1, the printing drum 1 has a built-in ink applying mechanism, and the drum 1 on which the base paper is mounted has a structure in which the surface of the drum 1 and the base paper are separated from each other. Ink is supplied in between. Hereinafter, the printing drum 1
The ink application mechanism will be described with reference to FIG. The printing drum 1 is made of a flexible sheet-shaped metal mesh in a cylindrical shape so that the ink supplied from the inside is sufficiently adapted, and has sufficient flexibility. It is the transfer roller 18 of the ink application mechanism that substantially receives the pressure of the press roller 2 at the contact portion between the printing drum 1 and the press roller 2. The transfer roller 18 is a roller made of a surface rubber which is in contact with the printing drum 1 and applies and supplies ink to the printing drum 1 while rotating in the same direction and at the same peripheral speed. First, the ink is stored in the ink tank 22 (see FIG. 3).
To form an ink reservoir 21 between the ink roller 19 and the squeegee roller 20. The ink roller 19 and the squeegee roller 20 are both metal rollers and are circumscribed to each other. A fine groove is formed on the surface of the squeegee roller 20 with high dimensional accuracy, and the ink supply amount is accurately controlled by a gap formed between the two rollers in the groove. Further, the ink moves from the ink roller 19 to the transfer roller 18, and both the rollers 18, 1
9 are circumscribed while rotating in the same direction,
In the contact portion, the outer peripheral surfaces of the ink rollers 19 are advanced in the direction in which the outer peripheral surfaces are opposed to each other. In addition, since the outer peripheral surface of the transfer roller 18 is formed of rubber, the ink is sufficiently adapted to the transfer roller 18. In this embodiment, the surface of the transfer roller 18 is made of rubber. However, even if the transfer roller 18 is made of a relatively hard synthetic resin, a certain degree of ink affinity can be obtained. It is practical because it can be expected to have the same ink affinity as. In particular, in the case of a metal roller, there is no possibility that the roller will swell or deteriorate due to the ink, and the roller is excellent in durability.

As described above, since the transfer roller 18 is in contact with the print drum 1 and rotates in the same direction at the same peripheral speed, only a necessary amount of ink is transferred to the print drum 1 and excess ink is transferred. While being adhered to the surface of the roller 18, it is transported beyond the contact point between the transfer roller 18 and the printing drum 1. The surplus ink on the transfer roller 18 reaches the contact point facing the ink roller 19 again, where it is almost completely collected by the ink roller 19 and returned to the ink reservoir 21. In this way, no ink pool is formed on the back surface of the printing drum 1, and a good ink supply state can always be obtained for the printing drum 1.

By changing the peripheral speed ratio of the ink roller 19 to the transfer roller 18, the amount of ink transferred to the transfer roller 18 can be variably adjusted.
Is reduced by half, the amount of ink transferred to the transfer roller 18 is also reduced by half. Further, since the surface of the transfer roller 18 is made of rubber, the pressure of the press roller 2 acts on the paper on the printing drum 1 appropriately without difficulty, and good printing can be performed.

In the above-described embodiment, the ink applying mechanism is applied to a single-cylinder type printing press.
As shown in (1), it is needless to say that the present invention can also be applied to a twin-cylinder or double-cylinder printing machine. In FIG. 7, reference numeral 51 denotes a screen; 52, a drum on which the screen 51 is wound;
53 is a press roller. The ink application mechanism is provided in the screen 51 between the two drums 52, 52.
The screen 51 is sandwiched between the transfer roller 54 and the press roller 53, and is rotationally driven by contact between the two rollers 53, 54. The screen 51 and the peripheral surface of the transfer roller 54 advance at the same speed in the same direction. In the figure, 55 is an ink roller, 56 is a squeegee roller, and 57 is an ink reservoir.

As described in detail later, the printing drum 1
Is configured to be movable in the axial direction with respect to the press roller 2, but the transfer roller 18 in the print drum 1 is axially supported so as not to move in the axial direction with respect to the press roller 2. That is, since the relative axial positional relationship between the transfer roller 18 and the press roller 2 is fixed, even when the print drum 1 moves, the pressure applied from the press roller 2 to the transfer roller 18 is always constant. .

Since the surface of the transfer roller 18 is made of rubber and the ink roller 19 rotates in a direction opposite to the transfer roller 18, when ink exists between the rollers 18, 19, the ink performs a lubricating action to form the two rollers. Although rotation of the transfer rollers 18 and 19 is permitted, a large frictional force is generated when the transfer roller 18 is dry. In such a state, both rollers 18, 1
When the roller 9 rotates, the rubber surface of the transfer roller 18 may be damaged by friction. Therefore, when the transfer roller 18 is dry, it is preferable that the contact between the rollers 18 and 19 be released. Specifically, for example, the transfer roller 18
Alternatively, one of the shafts of the ink roller 19 is spring-biased in the direction of the contact state, so that when an excessive frictional force is applied, the roller can escape. When the ink roller 19 is configured to escape, it is preferable that the relationship between the ink roller 19 and the squeegee roller 20 is not changed, so that the ink roller 19 and the squeegee roller 20 are integrally escaped. Is preferred.

FIGS. 3 and 4 are partial cross-sectional views showing the support state of the printing drum 1 and the transfer roller 18 provided therein. FIG. 3 is a view showing the state where the printing drum 1 is located at the right end. Reference numeral 4 denotes a state where the print drum 1 is located at the left end. In the figure, reference numeral 23 denotes a main body frame, and a drive shaft 24 for rotating the printing drum 1 is rotatably supported on the main body frame 23. Drive shaft 2
A drive gear 25 is fixed to an inner end of the drive gear 4. on the other hand,
A center shaft 26 serving as a rotation axis of the printing drum 1 is supported so as not to rotate with respect to the main body frame 23, and the printing drum 1 is rotatably and slidably mounted on the center shaft 26. Note that an ink supply path for the ink application mechanism is formed in the fixed center shaft 26, or an electric wire can be inserted therethrough. In the figure, reference numeral 22 denotes an ink tank. The ink flows from the ink pump 27 through the ink supply pipe 28 into the center shaft 26, and drops into the ink reservoir 21 between the squeegee roller 20 and the ink roller 19 by an appropriate amount. Supplied.

At one end of the center shaft 26, a gear-shaped spline shaft 29 formed long in the axial direction is provided with a bearing 3.
0 _1, 30 are rotatably mounted via a _2, one end of the spline shaft 29 is meshed with the drive gear 25.
Further, an inner peripheral spline in the form of an internal gear that meshes with the spline shaft 29 is formed on one boss 31 _R of the printing drum 1. That is, the driving force input to the driving shaft 24 is transmitted to the printing drum 1 via the driving gear 25 and the spline shaft 29 to rotate it. Further engagement of the boss 31 _R and the spline shaft 29, the spline shaft 2
Allowing axial sliding of the boss portion 31 _R for 9. The printing drum 1 is also provided at the other end of the center shaft 26.
The other boss 31 _L of, and is rotatably and slidably mounted through a bearing 30 _3. That is, the bearing 30
₃ , the inner peripheral portion is slidable in the axial direction with respect to the center shaft 26, and the outer peripheral portion is rotatable. In this way, the printing drum 1 is movable within a predetermined range in the axial direction. The spline shaft 29 also functions as a gear for transmitting a rotational driving force at one end in the drum 1, and is used to rotationally drive each roller (see FIG. 2) of the ink application mechanism in the drum 1. It is in mesh with the gear.

In the figure, reference numeral 32 denotes a motor for driving the printing drum 1 to move in the axial direction. A worm gear 33 is mounted on the output shaft of the motor 32, and a pinion gear (not shown) meshes with the worm gear 33. As shown in the enlarged view of FIG. 8, the shaft 60 of the pinion gear extends in parallel with the center shaft 26 of the printing drum 1, and a male screw is formed on the outer peripheral surface thereof. On the other hand, the printing drum 1
Bearing 3 provided between the shaft 3 and the center shaft 26
0 ₃ has a female screw formed on the inner peripheral portion thereof, and is screwed with the male screw of the shaft of the pinion gear. That is, the worm gear 33 by the motor 32 rotates rotates the pinion gear, rotation of the shaft 60 of the pinion gear moves along the bearing 30 ₃ which is screwed to a center shaft 26. Printing drum 1 is moved together with the bearing 30 ₃ in the axial direction. When the rotation direction of the motor 32 is reversed, the movement direction of the printing drum 1 is also reversed. The movement of the printing drum 1 in the axial direction is performed by pressing the printing roller 1 with the pressing roller 2.
When the pressing is performed in a state in which the concave portions 15 face each other, that is, a state in which the pressing force of the press roller 2 is not applied to the printing drum 1, the driving load is sufficiently small.

The transfer roller 18 of the ink application mechanism section
Has an axial length sufficient to cover the movement width of the printing drum 1. In the drawing, reference numeral 34 denotes a lever for pulling out the drum unit from the apparatus main body when the entire drum unit is replaced, and 35 denotes an ink tank 2.
2 is a lever for pulling out. The drum unit is
The center shaft 26 and the spline shaft 29 are also held by the drum support frame 50. When the drum unit is pulled out of the apparatus main body, the center shaft 26 separates from the main body frame 23 and the spline shaft 29 separates from the drive gear 25. .

As described above, the printing drum 1 is formed in a cylindrical shape with a flexible sheet-shaped metal mesh. Generally, it is a metal sheet having a thickness of about 0.2 mm, and is formed by electroforming. As shown in FIG.
The non-printing area 37 at both ends of 6 has many holes 40 larger than the small holes 39 uniformly formed in the printing area 38. The formation of the holes 40 enhances the flexibility at both ends of the metal sheet 36. That is, when receiving the pressing force of the press roller 2, the printing drum 1
Are sufficiently bent to both ends thereof, and substantially the entire original print area 38 can be effectively used. The holes 40 formed in the non-printing areas 37 at both ends are closed by the resin material 41, and the ink does not leak out from the holes 40. Further, the resin material 41 has sufficient flexibility, and the flexibility of the both ends of the printing drum 1 is hardly impaired by being filled with the resin material. As shown in FIG. 6, the hole formed by electroforming has a step 42 in the cross-sectional shape corresponding to the resist layer on the electroformed base material. Accordingly, the resin material 41 filled in the hole 40 is caught by the step portion 42 and exerts a sufficient bonding force, and does not fall off even if both ends of the drum 1 bend. Actually, instead of filling the resin material 41 in each of the holes 40, the resin material 41 may be applied and cured over the entire non-printing area 37, and sufficient bonding force and sufficient flexibility may be obtained. can get. The holes 40 can be formed by etching.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a rotary copying machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic configuration of a printing drum, an ink application mechanism, and a press roller in a rotary transfer printing press according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a main part of a moving mechanism of a printing drum in one embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state where the moving mechanism shown in FIG. 3 is located at a left end of a printing drum.

FIG. 5 is an explanatory diagram showing a mesh shape of a metal mesh sheet in a printing area and a non-printing area of a printing drum in one embodiment of the present invention.

FIG. 6 is a cross-sectional view of the metal mesh sheet of FIG.

FIG. 7 is an explanatory diagram showing a schematic configuration of a screen, an ink application mechanism, and a press roller in a rotary copying machine according to another embodiment of the present invention.

FIG. 8 is an enlarged view of a main part of the moving mechanism shown in FIG. 3;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 printing drum 2 press roller 3 stencil discharge mechanism 4 stencil roll 5 plate making thermal head 6 stencil stencil 8 press roller drive mechanism 9 print paper tray 10 paper feed mechanism 11 paper discharge receiving unit 12 original reading unit 13 stencil clamper Reference Signs List 14 base paper flip-up lever 15 escape recess 16 locking claw 17 paper discharge roller 18 transfer roller 19 ink roller 20 squeegee roller 21 ink reservoir 22 ink tank 23 main body frame 24 print drum drive shaft 25 drive gear 26 center shaft 27 ink pump 28 Ink supply pipe 29 Spline shaft 30 Bearing 31 Boss part 32 Motor 33 Worm gear 34 Lever 35 Lever 36 Metal sheet 37 Non-printing area 38 Printing area 39 Small hole 40 Hole 41 Resin material 42 Stepped part 50 Drum support Over arm 51 screen 52 drum 53 press roller 54 transfer roller 55 ink roller 56 a squeegee roller 57 the axis of the ink reservoir 60 pinion gears

Claims (1)

(57) [Claims] 1. A printing drum (1) on which a base paper is mounted, and an ink applying means (18) provided in the printing drum (1) for applying and supplying ink to the printing drum (1).
And a press roller (2) circumscribing the printing drum (1) and pressing the printing drum (1), wherein the printing drum (1) includes the press roller (2) and A rotary transfer printing press comprising a driving means (32) movable in the axial direction with respect to the ink applying means (18) and moving the printing drum (1) in the axial direction.