High Printing Quality From an Offset Press

RYOBI has packed the 3404DI’s compact body with a host of outstanding printing features. Incorporating RYOBI’s unrivaled offset printing know-how, it features a highly reliable, robust design that yields high printing quality and promises a long and productive service life.

Mechanical Configuration	1	7	2	10	7	2	1
7	1	7	2	10	7	2	1
							2
2							7
							7
3							3
4							4
4

Compact Design Based on a Unique Cylinder Arrangement

The 3404DI uses a satellite V-shaped 5-cylinder system consisting of two sets of double- diameter blanket cylinders and plate cylinders, which rotate around a triple-diameter impres- sion cylinder. Paper is tightly held by the impression cylinder grippers and rotated twice without a gripper change for precise 4-color printing.The large diameter of the impression cylinder reduces paper curling as well as damage to the printed material.Thanks to this cylinder arrangement, the RYOBI 3404DI achieves a compact design that’s about the same size as a conventional 2-color press.

Paper Travel

Sheets are fed one-per-rotation of the	Blanket cylinder 2 prints	The paper printed with the second
plate and blanket cylinders.The paper	the second color.	color is not transferred to the
is held by the impression cylinder		delivery section, but enters the
(surface A). Blanket cylinder 1 prints		second rotation while being held by
the first color.		the impression cylinder grippers.

	5					5
	6
13
	12	11	9	8		6
1.	Imaging head	6.	Automatic blanket cleaning device		10.	Impression cylinder
2.	Printing plate	7.	Automatic ink roller cleaning device		11.	Decurling device
3.	Plate cylinder	8.	Underswing system		12.	Suction wheel
4.	Plate cleaning device	9.	Paper feed drum		13.	Infrared dryer (option)

During the second rotation,	When blanket cylinder 4 finishes
blanket cylinder 3 prints the	printing the fourth color, the sheet
third color on the sheet.	is delivered to the delivery pile.

5. Blanket cylinder

The triple-diameter impression cylinder reduces paper curl

Solid, Reliable Design

The 3404DI uses a bearer contact system to maintain constant plate pressure with each rotation of the cylinder. Plus, induction- hardened ultra-high-precision helical gears and cylinders fitted with ultra-high-precision bearings ensure consistent, stable printing quality over long periods of use.

Three Plate Cleaning Devices

Once imaging has been completed, plate cleaning is carried out by three devices—a dry cleaning device, a wet cleaning device and a vacuum, to remove residual silicone on the plate.

11-Zone Divided Ink Fountains

Ink fountains are divided into 11 zones, each having its own motor.The ink supply volume for each zone is remotely controlled from the operation stand.

Inking Mechanism

Each inking unit consists of 15 rollers including 4 form rollers, ensuring uniform inking.

Vacuum

Plate cleaning device (dry cleaning)

Plate cleaning device (wet cleaning)

Plate cleaning devices

Ink Roller Temperature Control System

Roller temperature is maintained at an optimum level by circulating temperature-controlled water (warm water and cold water) inside the oscillating rollers and fountain rollers. By minimizing fluctua- tions in ink roller temperature, consistent printing quality is maintained, even during long print runs.

Ink roller temperature control system

Waterless Plate (PEARLdry™ Plus)

The 3404DI uses PEARLdry™ Plus, a roll-type waterless plate.This plate uses laser action to form surfaces that are either adhesive or repellent to ink. Each plate lasts for approximately 20,000 impressions, and will accommodate both short runs as well as longer, large-lot production.

Dimensions
		3,230 mm (10'7")
2,635mm(8'8")		1,915mm(6'3")
		720 mm (2'4")
		990 mm (3'3")
1,913mm(6'3")	1,298mm(4'3")	1,665mm(5'6")

Ultra-high-precision helical gears are used	Inking section
on the impression cylinder

Note: The number of available plate impressions depends on printing conditions such as the type of ink and paper stock used.