JPH05147200A - Ink ductor - Google Patents

Abstract

PURPOSE:To enable transfer quantity of ink to be adjusted by a method wherein variation is applied to reciprocating operation of an ink ductor which transfers ink from an ink fountain roll to an ink roller by reciprocating between the ink fountain roll and the ink roller. CONSTITUTION:A number of rotations of a rotary shaft 29 rotating coaxially with a driving cam which reciprocates an ink ductor 3 is detected with a sensor 3. An air cylinder is actuated at an integral ratio to said number of rotations, and reciprocation of the ink ductor 3 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink feeding device capable of changing the reciprocating speed of an ink feeding roll in order to stabilize the amount of ink supplied to a printed matter.

[0002]

2. Description of the Related Art FIG. 6 schematically shows an inking device in a printing machine.
Shown in. Reference numeral 1 is an ink fountain in which ink is placed.
The ink of the ink fountain 1 is applied to the fountain roll 2 by the rotation of the ink fountain roll 2, and the ink replenishing roll 3
The ink is transferred from the fountain roll 2 to the ink replenishing roll 3 by the swinging of, and from the ink replenishing roll 3 to the ink roll (kneading roll) 4. The ink transferred to the ink roll 4 is kneaded by a roll group 5 including a shaking roll, transferred to an inking roll 6 and supplied to the plate cylinder 7.
In the figure, 8 is a blanket cylinder, 9 is a web, and 10 is a water supply device.

In such an inking device, the ink feeding roll 3 is reciprocally rocked between the fountain roll 2 and the ink roll 4, and the reciprocating motion makes the ink delivery amount constant, so that the printing machine is operated. The same drive source as that of the printing machine is used so as to synchronize with the rotation speed of the printer.

Therefore, the ink supply amount is adjusted by opening and closing the ink fountain key in the ink fountain 1.

[0005]

However, due to the speeding up of the printing machine, the balance between the ink supply amount to the printing paper and the opening and closing of the ink fountain key becomes delicate, making it difficult to stabilize the ink supply amount. .. In particular, an ink residue phenomenon occurs on a printed matter with a small amount of ink supplied to the printing paper surface, which causes unevenness of ink density.

[0006]

In order to solve the above problems, according to the present invention, an ink feeding roll provided swingably between an ink fountain roll and an inking roll and rotating in synchronization with a printing machine. An ink feeding roll driving cam, a swinging force transmitting means for swinging the ink feeding roll by the rotation of the ink feeding roll driving cam, and an ink feeding stopping mechanism for stopping the swinging of the ink feeding roll, In the ink feeding device provided with, a sensor for detecting the number of revolutions of the ink feeding roll driving cam is provided, and the ink feeding stopping mechanism is operated based on the detection signal of the sensor.

[0007]

The rotation speed of the cam for driving the ink feeding roll is detected, and the ink feeding stopping mechanism is operated at every predetermined rotation number. During this period, the ink feeding roll is on standby on the side of the ink roll, so that the ink application is stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to the drawings. Of the drawings, FIG. 1 schematically shows a part of a side surface of an ink dispensing device according to one embodiment, and FIGS. 2 and 3 schematically show side surfaces at different positions. In the figure, a cam for driving the ink feeding roll and the like are shown.

Reference numeral 1 denotes an ink fountain, which is an ink fountain body 11
And the ink fountain roll 2 located at the tip of the fountain roll 2 and the flesh 12 close to the surface of the fountain roll 2, and the ink on the ink fountain body 11 is rotated by driving and rotating the fountain roll 2. It is painted on the roll 2.

A swing shaft 13 is supported by a frame of the printing machine and positioned below the pot roll 2. Swing shaft 13
A pair of support levers 14 is fixed to the lever 14. The lever 14 rotatably supports the ink feeding roll 3 by being positioned between the fountain roll 2 and the ink roll (kneading roll) 4 of the ink roll group. ing.

A swing lever 15 is fixed to different positions of the swing shaft 13, and one end of a turnbuckle 16 as a connecting member is connected to the swing lever 15.

On the other hand, a bracket 17 attached to the frame of the printing machine supports a cam 18 for driving the ink replenishing roll, and one end of a lever 19 connected to the other end of the turnbuckle 16 drives this drive. A roller 20 is rotatably attached as a cam follower that engages with the working cam 18. The lever 19 is rotatably supported on the frame side, and a spring force for pressing the roller 20 against the surface of the drive cam 18 is biased at the other end.

A worm wheel 21 is fixed on the cam shaft of the drive cam 18, and a worm 23 meshing with the worm wheel 21 is provided on a transmission shaft 22 supported by the bracket 17. A gear 24 is attached to the end of the transmission shaft 22, and the gear 24 is rotated in synchronization with the printing machine by the same drive source as the printing machine. Therefore, the rotation of the drive cam 18 causes the roller 20 to move up and down,
The rocking shaft 13 is reciprocally rocked through the lever 19, the turnbuckle 16, and the rocking lever 15, and the ink ejecting roll 3
It travels back and forth between the crucible roll 2 and the ink roll 4.

Stop levers 25 are fixed to different positions of the swing shaft 13 as shown in FIG. An air cylinder 26 is installed in the frame of the printing machine as an ink feeding stop mechanism so as to face the tip of the stop lever 25. A stopper portion 28 is provided at the tip of the piston rod 27 of the air cylinder 26.

Therefore, when the piston rod 27 is extended by the operation of the air cylinder 26, the stopper portion 28 pushes the tip of the stop lever 25, the swing lever 13 together with the stop lever 25, the ink feeding roll 3 and the fountain roll 2. Rotate away from. At the pivot end, the lever 19 for swinging and the lever 19 for turning through the turnbuckle 16 are used.
Is pushed up, and the roller 20 is out of the maximum lift amount of the ink feeding roll driving cam 18. That is, the roller 20 does not move up and down even when the ink feeding roll driving cam 18 rotates, the ink feeding roll 3 does not reciprocate, and remains stopped on the ink roll 4 side.

An annular bracket 30 is attached to a rotary shaft 29 which is rotated at the same speed as the ink feeding roll driving cam 18.
Is attached, and the plate 3 is attached to a part of the bracket 30.
1 is attached. On the other hand, the plate 31 is attached to the support bracket 32 attached to the frame side of the printing machine.
A sensor 33 such as a proximity switch for detecting is attached. The rotation speed of the drive cam 18 is detected by detecting the plate 31 with the sensor 33. The plate 31 is positioned by changing the fixing position of the bracket 28 so that the sensor 33 detects the position at which the maximum diameter of the drive cam 18 starts.

The detection signal of the sensor 33 is input to the control device, and the air cylinder 26 is instructed to expand or contract based on the signal.

Next, the operation of this device will be described.
In a standard operating state (a state in which the speed of the ink feeding roll 3 is not changed), as shown in FIG. 5, the plate drum 7 makes X rotations (for example, 6 rotations), whereas the ink feeding roll 3 makes one reciprocation. That is, the drive cam 18 rotates once.

Since the rotation shaft 29 has the same number of rotations as the drive cam 18, the sensor 33 detects the plate 31 every time the plate cylinder 7 makes X rotations. This one rotation signal is Y.

A reciprocating operation stop signal is transmitted to the air cylinder 26 at an integer ratio with respect to Y to operate the air cylinder 26. For example, the air cylinder 26 is stopped W (integer) times while the Y signal is Z (integer) times. Z> W, and Z: W
The ratio of FIG. 5 shows the case where the stop signal is transmitted once to the air cylinder 26 with respect to the Y signal twice. In this case, after all, the ink feeding roll 3 reciprocates only once while the plate cylinder 7 makes 12 revolutions, and transfers the ink from the fountain roll 2 to the ink roll 4.

In the actual operation of the printing machine, printing is performed by selecting the number of stops by the air cylinder 26 with the select button of the operation stand. The select button display is displayed as XZ: X (Z-W).

In the above embodiment, the present invention is applied to the ink feeding roll 3 provided between the fountain roll 2 and the ink roll 4 equipped with an ink feeding stopping mechanism.
It is also applicable to any one of the roll groups from the fountain roll 2 to the inking roll 6 (see, for example, FIG. 6), and the roll equipped with an ink feed stop mechanism. The effect is obtained.

Further, the support lever 14 does not have to be fixed on the swing shaft 13 as in the above-mentioned embodiment, but the swing shaft 13 is not necessary.
It is also possible to fix the shaft corresponding to the above to the frame, or to implant the corresponding pins in the left and right frames, and to swingably support the support lever 14 therethrough via bearings. In this case, the support lever 14 also moves together with the swing lever 15,
It must have the function of the stop lever 25. In this case, it is not necessary to separately provide the swing lever 15 and the stop lever 25.

In the above embodiment, the turnbuckle 16 is connected to the swing lever 15 provided on the swing shaft 13 and is coupled to the turnbuckle 16 as swing force transmitting means for swinging the ink refill roll 3. The roller 20 supported by the lever 19 that has been ejected is used to drive the ink feeding roll 1
However, the swing lever 15 or the support lever 14 may be directly engaged with the drive cam 18 via a roller or the like. In that case, an urging means for urging the swinging lever 15 and the supporting lever 14 in the direction of contacting the drive cam 18 is provided.

The ink feeding stop mechanism is not limited to the one for stopping the ink feeding by separating the roller 20 which is in contact with the driving cam 18 as in the above-described embodiment, but also the driving lever 18 is moved from the driving cam 18 to the support lever 14. It is also possible to separate some of the rocking force transmitting means between them.

Further, in the above embodiment, the drive cam 18 is used.
The rotation speed of is taken out from another shaft 29,
A sensor may be attached to the cam 18, a sensor may be attached to the rotary shaft of the cam 18, or the like, and the cam 18 may be taken out from the cam shaft itself, or may be taken out from another rotary shaft that rotates in synchronization.

Further, the degree of speed change (intermittent degree) of the ink feeding roll 3 can be variously changed according to the printed matter.

[0028]

According to the ink feeding device of the present invention, the reciprocating motion between the fountain roll and the ink roll of the ink feeding roll can be changed to be intermittent. It is possible to mitigate the ink residue phenomenon of the group, thus eliminating the excessive supply of ink to the printed matter and eliminating the unevenness of ink density.

[Brief description of drawings]

FIG. 1 is a partial side view of one embodiment.

FIG. 2 is a side view of a different part of the embodiment.

FIG. 3 is a side view of a different part of the embodiment.

FIG. 4 is a sectional view showing a drive cam and the like.

FIG. 5 is an explanatory diagram of a shift example of the embodiment apparatus.

FIG. 6 is a schematic view of an inking device.

[Explanation of symbols]

 1 Ink fountain 2 Fountain roll 3 Ink roll 5 Ink roll 5 Ink roll group 7 Plate cylinder 13 Swing shaft 14 Support lever 15 Swing lever 16 Turnbuckle 18 Ink roll driving cam 19 Lever 20 Roller 24 Gear 25 For stopping Lever 26 Air cylinder 28 Stopper 29 Rotating shaft 31 Plate 33 Sensor

Claims (1)

[Claims] 1. An ink feeding roll provided between an ink fountain roll and an inking roll so as to be swingable, an ink feeding roll driving cam rotated in synchronization with a printing press, and the ink feeding roll driving. An ink feeding roll driving mechanism for swinging the ink feeding roll by the rotation of the ink feeding roll; and an ink feeding stopping mechanism for stopping the swinging of the ink feeding roll, wherein the ink feeding roll driving cam is provided. A sensor for detecting the number of revolutions of the ink is provided, and the ink recalling mechanism is operated based on a detection signal of the sensor.