JPH0624834B2 - Flatbed proof press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) According to the present invention, printing is performed by fixing a printing sheet on a printing surface plate with a cam and moving a gantry on the printing sheet. It is related to the flatbed proof press that can be done.

(Prior Art) A conventional flatbed proof press will be described with reference to the drawings.

The one shown in Fig. 3 is for lithographic offset printing. The platen plate (12), printing platen (13), fixed dampening water device (17) and fixed on the flatbed proof press main body (11). An inking device (18) is fixedly provided, and a pedestal (16) is movably mounted thereon. The mount (16) is provided with a mount dampening device (20), a blanket (19), and a mount inking device (21). In addition, the plate presser cam (14) is attached to the printing platen (12).
A paper pressing cam (15) is provided in (13), and the plate and the printing paper are fixed to the respective surface plates (12) and (13) by raising and lowering the cam.

When actually printing, fix the plate on the platen (12) with the plate-holding cam, and put the ink and dampening water in the inking device (1
8) (21) and dampening water device (17) (20) set, adjust each ink and dampening water, paper press cam (15) of printing platen (13)
, Set the printing paper in the correct position, and
When the paper pressing cam (15) of the printing platen (13) is lowered to fix the printing paper and the pedestal is moved on the printing paper, one sheet of printing is performed. The printed printing paper is taken out by raising the paper pressing cam (15) of the printing platen (13) again.

At this time, the paper presser cam (15) of the printing platen (13) is lifted and lowered by the cam lift pedal (22), and the paper presser cam (15) is pushed by depressing the cam lift pedal (22). The paper presser cam can be lifted and released by releasing the foot from the cam lift pedal (22).
(15) was a mechanism to descend. This is because at the time of printing, the hands cannot be used because of adjustment of dampening water, replacement of printing paper, and observation of printing conditions.

(Problems to be solved by the invention) In the conventional flatbed proof press, work such as observing the register of the printed matter and observing the printing situation by the amount of ink or dampening water after each printing Since there is a large amount of work, it is required to reduce the work load of workers.

Further, due to such a large work load, many mistakes are made, which causes a decrease in workability and an accident.

(Means for solving the problem) The flatbed proof press is used to fix the printing paper on the printing platen, the paper holding cam, the means to detect when the stand passes a predetermined position, and the detection result automatically Provide a means for raising and lowering the paper holding cam.

(Function) According to the present invention, when printing is performed on the printing paper, the gantry reciprocates, but before the gantry passes the printing platen, the paper pressing cam automatically lowers to fix the printing paper, and the gantry prints. After passing the board, the paper pressing cam automatically raises to release the printing paper.

(Example) The Example of this invention is described using drawing. FIG. 1 is a side view showing a flatbed proof printing machine of the present invention, and FIG. 2 is a block diagram showing a mechanism for operating the paper pressing cam.

A fixed dampening water device (17), a plate surface plate (12), a printing surface plate (13) and a fixed inking device (18) are fixedly provided on the flatbed proof press main body (11), The plate presser cam (1
4), the printing platen (13) is provided with the paper pressing cam (15), which is designed to move up and down.
The paper pressing cam (15) can be moved up and down by the paper pressing cam raising mechanism (24) driven by the air pump (26).

In addition, limit switches (23) are provided on the left and right of this printing platen so that during normal printing, it can be moved independently of the cam lift pedal (22) provided at the bottom of the flatbed calibration printing machine. . In this case, by moving the gantry (16), the operating protrusion (27) on the gantry (16) will move to the limit switch (23).
This is because the position of the gantry (16) can be known by tapping. When actually printing with such a flatbed proof printing machine, the work can be performed in the same manner as a conventional flatbed proof printing machine without any involvement of the operator in raising and lowering the cam.

FIG. 2 is a block diagram showing an example of the present invention. The paper pressing cam (15) is driven by the paper pressing cam raising mechanism (24). It is the automation switch (25) and the cam raising pedal (22) that actuate the paper pressing cam raising mechanism (24). Of these, the cam lift pedal (22) is the same as the conventional one, but the automation switch (25) is turned on and off by the two limit switches (23), and this automation switch (25) is turned off. Paper presser cam lift mechanism with cam lift pedal (22) only
(24) can now be driven.

Therefore, in a flatbed proof printing machine such as this example, the paper pressing cam automatically descends when the gantry automatically approaches the printing platen during normal times, and automatically rises when the gantry moves away from the printing platen. It became like.

Of course, in this example, the limit switch detected that the gantry approached the printing surface plate, but it is natural that it may be detected by other switches or optical sensors.
Also, the flatbed proof printing machine itself is not limited to lithographic offset printing,
It is obvious that it can be applied to other plate type flatbed proof presses.

(Effects of the Invention) By using the flatbed proof press of the present invention, the lifting and lowering of the paper pressing cam can be automated, and therefore the burden caused by the large amount of work of the worker can be reduced, the work efficiency is improved and the accident is prevented. It has become possible to contribute to. In addition, paper feeding separately,
If a mechanism for discharging paper is installed, it can contribute to further improvement of work efficiency and prevention of accidents.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.
The figure is a block diagram of the mechanism of the operation of the paper pressing cam of the present invention. FIG. 3 is a side view showing a conventional example. (11)… Main body, (12)… Plate surface plate (13)… Printing surface plate, (14)… Plate presser cam (15)… Paper presser cam, (16)… Stand (17)… Fixed dampening device , (18)… Fixed inking device (19)… Blanket, (20)… Frame dampening device (21)… Frame inking device, (22)… Cam lift pedal (23)… Limit switch, (24) … Paper presser cam lift mechanism (25)… Automation switch, (26)… Air pump (27)… Operating convex part

Claims (1)

[Claims] 1. A printing platen on which at least printing paper is placed, and a paper pressing cam for fixing the printing paper on the printing platen.
In a flatbed proof printing machine having a cam lift pedal for raising and lowering the paper pressing cam and a stand for moving on a main body including a printing platen to print on a printing paper, an air pump and the paper driven by the air pump. The paper presser cam raising mechanism for raising the presser cam, means for detecting that the frame has passed a predetermined position with respect to the printing platen, and the paper presser cam raising mechanism for receiving a signal from the detecting means. A flatbed proof printing machine having an automation switch for driving, and when the automation switch is turned off, the paper holding cam raising mechanism is driven by the cam lifting pedal.