JPH1044367A - Rotary screen printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce damaged sheets by simplifying a structure and facilitating color registration and timing regulation at each screen plate. SOLUTION: The rotary screen printer comprises a printer frame 1, an impression cylinder 3 and driving gear 4 mounted at the frame 1 via a support shaft 2, printing units 11A to 11F respectively disposed at a plurality of printing units mounts 10A to 10F provided at an arbitrary interval in the frame 1 in a circumferential direction of a drum, and ink drying means 12A to 12G disposed between the units 11A and 11F. The units 11A to 11F each has an inking means and a screen plate cylinder 15. A matter 5 to be printed is sandwiched between the cylinder 3 and a screen plate cylinder 15 to be fed. Further, the respective cylinders 15 are rotatably driven at the same circumferential speed via synchronous transmission gears by the gear 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary screen printer capable of performing multicolor printing.

[0002]

2. Description of the Related Art Conventionally, as this type of screen printing machine, a plurality of printing units are arranged at arbitrary intervals in a circumferential direction of a center drum, and an ink drying means is provided between each printing unit. The printing unit is mainly composed of a screen plate cylinder and an impression cylinder, and a printing medium is sandwiched between the screen plate cylinder and the impression cylinder, and the impression cylinder and the screen plate cylinder are continuously rotated so that printing is performed while feeding the printing object. Has become.

[0003]

By the way, in the above-mentioned prior art, there is a difference in the tension, that is, the amount of elongation of the printing material between the printing units. Timing adjustment is required, and it takes a lot of time for the adjustment work. In addition, a considerable amount of printed material is sent until the color / position adjustment is completed, and a large amount of waste paper (loss of the printed material) is generated. There was a problem that occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to prevent a difference in the amount of elongation of a printing material between printing units and to simplify the structure. Another object of the present invention is to provide a rotary screen printing machine which can easily adjust the color / position and timing of each screen plate and generate less waste paper.

[0005]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention provides a printing press frame, an impression cylinder and a driving gear attached to the printing press frame via a support shaft, driving means for driving the impression cylinder to rotate, and an impression cylinder of the printing press frame. A plurality of printing units provided at arbitrary intervals in the circumferential direction, and ink drying means provided between the printing units, wherein each of the printing units sandwiches a printing material between the printing unit and the impression cylinder. And a screen plate cylinder for feeding, wherein each screen plate cylinder is interlocked with the driving gear so as to drive the screen plate cylinder of each printing unit at the same peripheral speed (claim 1).

According to the present invention, when the impression cylinder is rotationally driven by the driving means, each screen plate cylinder is continuously rotated at the same peripheral speed by the driving gear. On the other hand, the printing medium is sandwiched between the impression cylinder and the screen plate cylinder, sent out, and printed. Therefore, between the printing units, the printing material is sent along the impression cylinder, and the tension is constant, there is no slack, and there is no difference in the amount of extension, so that the color, alignment and timing of each plate can be easily adjusted. The printing accuracy is improved.

[0007] Since a plurality of screen plate cylinders are simultaneously driven to rotate by drive gears provided on the impression cylinder, registration in each printing unit is facilitated. Further, the present invention is characterized in that the printing unit is mounted on a printing unit mounting portion provided on the printing press frame so as to be movable and exchangeable (claim 2).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a pair of left and right printing press frames, and a support shaft 2 is mounted on a center portion of the frame 1, and an impression cylinder 3 and a drive gear 4 having the same diameter are fixed to the shaft 2. The impression cylinder 3 is made of steel, and a sheet-shaped printing material 5 is guided and transported along the outer periphery thereof. A driving means 6 for rotating and driving the impression cylinder 3 is provided at a lower portion of the frame 1 and includes a driving shaft 7 which rotates in conjunction with a driving source such as a motor (not shown), and a bevel gear or the like on the driving shaft 7. A transmission gear 9 that rotates in conjunction with the transmission gear 8, and the transmission gear 9 is meshed with the drive gear 4.

On the frame 1, seven printing unit mounting portions 10A to 10A are provided at arbitrary intervals in the circumferential direction of the impression cylinder 3.
F and a roller mounting portion 10G are arranged in a protruding manner, and the printing units 11A to 11F are detachably mounted on the mounting portions 10A to 10F.
F, ink drying means 12A to 12G are provided, respectively, so that the printing medium 5 sent from the printing unit 11A side goes around the impression cylinder 3 and is sent out from the printing unit 11F in a printing completed state. ing.

As shown in FIG. 2, each of the printing units 11A to 11F has the same configuration, and rotates and attaches to each of the mounting portions 10A to 10F of the frame 1 on the movable frame 13 via a plurality of support rollers 14. It comprises a screen plate cylinder 15 which is supported exchangeably, a synchronous transmission gear 16 fixed concentrically to the screen plate cylinder 15, and an inking means 17 including a squeegee. The screen plate cylinder 15 has a width (length in the axial direction) longer than the width of the impression cylinder 3, and both ends in the axial direction are supported by support rollers 14 so that the screen cylinder 15 does not interfere with the impression cylinder 3. I have.

The driving gear 4 is connected to the synchronous transmission gear 1.
6, the impression cylinder 3 and the screen plate cylinder 15 rotate synchronously at the same peripheral speed. Therefore, the printing material 5 is composed of the impression cylinder 3 and each printing stage, that is, each of the printing units 11A to 11F.
Are fed at the same speed and synchronously between the screen plate cylinders 15, and the tension is constant. By precisely disposing the screen plate 18 (see FIG. 3) at a fixed position, color / position alignment and timing adjustment can be performed. Performed with high precision.

The printing units 11A to 11F
The movable frame 13 including the screen plate cylinder 15 and the inking means 17 is provided with the unit mounting portions 10A to 10A.
0F, the rack 19 is provided so as to be horizontally movable and replaceable, and is provided on its side downward and horizontally so as to mesh with a drive pinion 20 provided on the mounting portions 10A to 10F. By rotating the movable frame 13 with respect to the impression cylinder 3, the synchronous transmission gear 16 meshes with the driving gear 4, and the printing material 5 is pressed by the impression cylinder 3 and the screen plate cylinder 15 at an appropriate pressure. It can be sandwiched between.

Each of the printing units 11A to 11F
Can be moved relative to the impression cylinder 3 in the direction of its support shaft 4 and / or in the circumferential direction, and can be adjusted in position by adjusting means (not shown). In the above embodiment, since the impression cylinder 3 is made of steel, cleaning is easy. However, the impression cylinder 3 can be made of rubber or rubber-lined on the outer peripheral surface.

The present invention is not limited to the above embodiment. For example, the number of the printing units 11A to 11F can be appropriately increased or decreased.

[0015]

As described above, the present invention provides a printing press frame, an impression cylinder and a driving gear attached to the printing press frame via a spindle, and a driving means for driving the impression cylinder to rotate. The printing press frame includes a plurality of printing units provided at arbitrary intervals in the circumferential direction of the impression cylinder, and ink drying means disposed between the printing units, and each printing unit includes the impression cylinder and And a screen plate cylinder for sandwiching and sending a printing medium therebetween, and each screen plate cylinder is interlocked with the driving gear so as to drive the screen plate cylinders of each printing unit at the same peripheral speed. Therefore, the structure is simplified and the tension of the printing material is constant, so that color adjustment, positioning and timing adjustment of each printing material plate are extremely easy, improving the adjustment work efficiency and generating waste paper. To reduce It is possible to improve the accuracy of the screen printing.

Further, the present invention is characterized in that the printing unit is mounted on the printing unit mounting portion provided on the printing press frame so as to be movable and exchangeable, so that the screen plate can be replaced as well as the screen plate. The screen plate cylinder can be easily replaced, and the adjustment of the narrow pressure of the printing substrate can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of the printing unit in the embodiment.

FIG. 3 is a partially omitted enlarged plan view of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printing machine frame 2 support shaft 3 impression cylinder 4 drive gear 5 printing object 6 drive means 10A to 10F printing unit mounting portion 11A to 11F printing unit 12A to 12G ink drying means 13 movable frame 15 screen plate cylinder 16 synchronous transmission gear 17 in King means

Claims (2)

[Claims] 1. A printing press frame, an impression cylinder and a driving gear mounted on the printing press frame via a support shaft, driving means for driving the impression cylinder to rotate, and a peripheral portion of the impression cylinder around the printing press frame. A plurality of printing units provided at arbitrary intervals in the direction, and ink drying means provided between the printing units, wherein each of the printing units sandwiches and sends out a printing material between the impression cylinder and the printing unit. And a screen plate cylinder,
A rotary screen printing machine wherein each screen plate cylinder is interlocked with the driving gear so as to drive the screen plate cylinders of each printing unit at the same peripheral speed. 2. The rotary screen printing press according to claim 1, wherein the printing unit is attached to a printing unit mounting portion provided on the printing press frame such that the printing unit can be adjusted and exchanged.