JPH08174801A - Roller nip amount regulator for offset printer - Google Patents

Abstract

PURPOSE: To rapidly and accurately regulate a nip amount without necessity of a manual operation. CONSTITUTION: A stopper cam member 25 is mounted at a frame side, and an adjustable stopper member 33 in contact with the cam member is so provided at an arm member 11 for supporting a form roller 15 as to be telescopically movable in the opposite direction to the member 25. A threaded feed rod 39 is rotatably mounted at the member 11 thereby to telescopically move the member 33 in the opposite direction to the member 25. The rod 39 is rotatably driven by a motor 57.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller nip amount adjusting device for an offset printing machine, and more particularly to a nip amount adjusting device for adjusting the nip amount of an inking roller or a watering roller with respect to a plate cylinder.

[0002]

2. Description of the Related Art In an offset printing machine, the amount of ink supplied to a plate cylinder is adjusted by adjusting the amount of nipping of an inking roller of an ink supply device with respect to the plate cylinder. The supply amount is adjusted by adjusting the nip amount between the watering roller of the dampening device and the plate cylinder.

Generally, an inking roller or a watering roller is rotatably attached to an arm member rotatably supported by a frame, and the arm member is urged in a rotational direction by a fluid pressure cylinder device. It is pressed against the plate cylinder. To adjust the nip amount of these rollers with respect to the plate cylinder, the amount of rotation of the arm member in the roller pressing direction is limited by manually contacting the adjusting screw provided on the arm member with the stopper member attached to the frame side. Is done by doing.

The nip amount adjusting mechanism using the adjusting screw is provided for each of the inking roller and the watering roller, and for each of the left and right arm members that both support the rollers. That is, this nip amount adjusting mechanism is provided at two positions on the left and right sides of one inking roller or watering roller.

[0005]

In the conventional nip amount adjusting mechanism, it is necessary to manually rotate the adjusting screw when adjusting the nip amount, and the nip amount must be set by reading the division amount or the scale. It takes time to set the nip amount to an appropriate value,
It is difficult to adjust the nip amount with high accuracy because there are individual differences in setting the nip amount and there is a limit to making the screw pitch of the adjusting screw fine.

Further, the nip amount adjusting mechanism is provided at two positions on the left and right sides of one inking roller or the watering roller, but it is possible to set the nip amount evenly in the left and right by the manual adjustment as described above. It's not easy.

Further, since the nip amount adjustment is performed by the manual work as described above, the nip amount adjustment cannot be performed by remote control.

The present invention has been made by paying attention to the problems as described above, so that the nip amount can be adjusted quickly and highly accurately without requiring manual work, and the nip amount can be evenly distributed on the left and right sides. An object of the present invention is to provide a roller nip amount adjusting device for an offset printing machine, which is improved so that the nip amount can be adjusted easily by remote control.

[0009]

In order to achieve the above-mentioned object, a roller nip amount adjusting device for an offset printing machine according to the present invention comprises an inking roller or a watering roller on an arm member rotatably supported by a frame. Is rotatably attached, and in the offset printing machine in which the inking roller or the watering roller is pressed against the plate cylinder by urging the arm member in the rotational direction, the plate of the inking roller or the watering roller is A roller nip amount adjusting device for adjusting a nip amount with a body, the stopper cam member attached to a frame side, and provided on the arm member so as to be able to move forward and backward in a direction opposite to the stopper cam member, and contact the stopper cam member. Thereby limiting the amount of rotation of the arm member in the roller pressing direction. A adjustable stopper member, a feed screw rod that is rotatably attached to the arm member, is connected to the adjustable stopper member, and moves the adjustable stopper member forward and backward in a direction opposite to the stopper cam member by rotation, and the feed screw rod. It is characterized by having a rotary drive actuator for rotationally driving.

In the roller nip amount adjusting device of the offset printing machine according to the present invention, the feed screw rod is provided in the adjustable screw stopper member and the first screw portion screwed with the nut member attached to the arm member. It has a 2nd screw part screwed in a screw hole, and the 1st screw part and the 2nd screw part have a mutually different screw pitch, and form the differential feed screw. It has a feature.

Further, the roller nip amount adjusting device of the offset printing machine according to the present invention has, in addition to the above-mentioned structure, a rotation amount detector for detecting the rotation amount of the feed screw rod. It has a feature.

[0012]

According to the above-mentioned structure, when the feed screw rod is rotationally driven by the rotary drive actuator, the adjustable stopper member abutting against the stopper cam member is moved forward and backward in the direction opposite to the stopper cam member, and the forward and backward movement causes the nip. The amount is adjusted.

Since the feed screw rod is a differential feed screw, the amount of forward / backward movement of the adjustable stopper member due to the rotation of the feed screw rod becomes minute according to the screw pitch difference, which allows the nip amount to be adjusted. Is performed with good reproducibility and high accuracy.

Further, since the rotation amount detector detects the rotation amount of the feed screw rod, the nip amount can be adjusted by remote control while monitoring the nip amount.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of a roller nip amount adjusting device of an offset printing machine according to the present invention.
In these drawings, reference numeral 1 indicates a plate cylinder, and the plate cylinder 1 indicates a plate cylinder rotatably supported by the side frame 3 by a bearing member 5 fixed to the side frame 3.

A bearing sleeve 9 of an ink leveling roller 7 is fixedly mounted on the side frame 3, and the bearing sleeve 9 rotatably supports the ink leveling roller 7.

The bearing sleeve 9 rotatably supports the intermediate portion of the roller support arm member 11 on its outer peripheral surface. A bearing member 13 is fixedly attached to one end of the roller support arm member 11, and the bearing member 13 rotatably supports the inking roller 15.

The side frame 3 has an air cylinder device 1
7 is mounted by a mount bolt 19 so as to be swingable. The pin rod 23 of the air cylinder device 17 is drivingly connected to the other end of the roller supporting arm member 11 by a pin 23 to rotate the roller supporting arm member 11 around the central axis of the bearing sleeve 9.

The plate cylinder 1, the ink leveling roller 7 and the inking roller 15 are arranged parallel to each other, and the inking roller 15 which is in sliding contact with the inking roller 7 is
The roller support arm member 1 by the air cylinder device 17
1 is urged in the clockwise direction in FIG. 1 to come into sliding contact with the plate cylinder 1.

A stopper cam member 25 is fixedly attached to the bearing member 5 attached to the side frame 3. The stopper cam member 25 has a stopper cam surface 27 that is concentric with the outer peripheral surface of the plate cylinder 1 and has an arcuate surface shape with the same outer diameter.

A casing 29 of the nip amount adjusting device is fixed to the roller supporting arm member 11. The casing 29 has a guide hole 31 for adjusting the adjustable stopper member 3.
3 is held by a detent so that it can move back and forth in the direction opposite to the stopper cam member 25.

The adjustable stopper member 33 faces the stopper cam surface 27 at the tip end surface 35 and abuts on the stopper cam surface 27, whereby the roller support arm member 1
1, the amount of rotation in the clockwise direction, that is, the amount of rotation in the roller pressing direction is limited.

A nut member 37 is fixedly mounted on the casing 29, and a screw portion 41 of a feed screw rod 39 is screwed onto the nut member 37. The feed screw rod 39 has another screw portion 43, and the screw portion 43 is screwed into a screw hole 45 formed in the adjustable stopper member 33. The screw portions 41 and 43 have different screw pitches to form a differential feed screw, and move the adjustable stopper member 33 forward and backward in the direction opposite to the stopper cam member 25.

For example, the screw portion 41 has a screw pitch of 1.1 m.
If it is a right-hand thread of m, the thread portion 43 has a thread pitch of 1.0
m of the right screw, and in this case, when the feed screw rod 39 rotates right, the feed screw rod 39 rotates the nut member 3
By screwing with 7, it moves 1.1 mm in the ascending direction per rotation, and the adjustable stopper member 33 moves 1.0 mm in the opposite direction. As a result, the feed screw rod 39 moves the adjustable stopper member 33 slightly forward by 0.1 mm per revolution.

The feed screw rod 39 includes a rotary drive shaft 47 and a pin 4.
9, the rotary drive shaft 47 is drivingly connected to the motor 57 mounted on the casing 29 via the gears 51 and 53 and the slip clutch 55.

A rotary encoder 59 is attached to the casing 29.
Is connected to the gear 51 with a slip clutch 61 and a gear 63, and detects the rotation amount of the feed screw rod 39.

Further, the rotary drive shaft 47 has a knob 6 for hand rotation.
5 is attached.

According to the above construction, the motor 57 drives the feed screw rod 39 to rotate in the forward and reverse directions, so that the feed screw rod 3 is rotated.
The differential feed screw action of 9 causes the adjustable stopper member 33 to move back and forth in the direction opposite to the stopper cam member 25, and the installation position of the adjustable stopper member 33 is finely adjusted.

When the roller support arm member 11 is urged clockwise by the air cylinder device 17 in FIG. 1, the ink leveling roller and the inking roller 15 which is in sliding contact with the ink plate cylinder 1 are Sliding contact with the ink leveling roller 5 at the same time. This roller support arm member 11
1, the amount of rotation in the clockwise direction, that is, the amount of rotation in the roller pressing direction is limited by the tip end surface 35 of the adjustable stopper member 33 coming into contact with the stopper cam surface 27 of the stopper cam member 25. When the roller stopper arm member 11 moves backward, the amount of rotation of the roller support arm member 11 in the roller pressing direction increases, and the nip amount of the ink form roller 15 increases. On the contrary, when the adjustable stopper member 33 moves backward, the roller support arm member The rotation amount of the roller 11 in the roller pressing direction decreases, and the nip amount of the ink form roller 15 decreases.

The position of the adjustable stopper member 33 is finely adjusted by the rotation of the feed screw rod 39 by the motor 57 as described above. Therefore, the nip amount is adjusted by controlling the energization of the motor 57.

Since the rotation amount of the feed screw rod 39, in other words, the movement amount of the adjustable stopper member 33 is detected by the rotary encoder 59, the movement amount of the adjustable stopper member 33 is monitored from the detection value of the rotary encoder 59. The adjustable stopper member 33 can be indexed and moved to an arbitrary position, that is, the required nip amount can be obtained by remote control with high precision and speed.

The above-described roller nip amount adjusting device is
It is provided on both the left and right sides of the ink form roller 15, and the left and right roller nip amount adjusting devices may be controlled synchronously with each other based on the detection values of the respective rotary encoders 59 in order to make the nip amounts even on the left and right.

The roller nip amount adjusting device can be similarly applied to the nip amount adjusting of the watering roller of the dampening device with respect to the plate cylinder.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0036]

As can be understood from the above description, according to the roller nip amount adjusting device of the offset printing machine of the present invention, the feed screw rod is rotatably driven by the rotary driving actuator such as a motor to contact the stopper cam member. The contacting adjustable stopper member moves back and forth in the direction opposite to the stopper cam member, and the nip amount is adjusted by this moving back and forth, so that the nip amount can be adjusted quickly and with high precision without requiring manual work. ,
Further, the nip amount can be easily set to the left and right by the control of the rotary drive actuator.

Since the feed screw rod is a differential feed screw, the amount of forward / backward movement of the adjustable stopper member due to the rotation of the feed screw rod becomes minute according to the screw pitch difference. Fine adjustment can be performed with high reproducibility and high accuracy.

Further, since the rotation amount detector such as a rotary encoder detects the rotation amount of the feed screw rod, the nip amount can be adjusted by remote control while remotely monitoring the nip amount. It also ensures that the settings are made evenly.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a roller nip amount adjusting device of an offset printing machine according to the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of a roller nip amount adjusting device of an offset printing machine according to the present invention.

FIG. 3 is an enlarged side view showing an essential part of an embodiment of a roller nip amount adjusting device of an offset printing machine according to the present invention.

[Explanation of symbols]

 1 Plate Cylinder 3 Side Frame 11 Roller Support Arm Member 15 Inking Roller 17 Air Cylinder Device 25 Stopper Cam Member 29 Casing 33 Adjustable Stopper Member 37 Nut Member 39 Feed Screw Rod 41, 43 Screw Part 45 Screw Hole 47 Rotation Drive Shaft 57 Motor 59 Rotary encoder

Claims (3)

[Claims] 1. An inking roller or a watering roller is rotatably attached to an arm member rotatably supported by a frame, and the inking roller or the water roller is urged by urging the arm member in a rotational direction. In an offset printing machine in which a forming roller is pressed against a plate cylinder, a roller nip amount adjusting device for adjusting a nip amount of the ink forming roller or the water forming roller with the plate cylinder, and a stopper cam member attached to the frame side, An adjustable stopper member that is provided on the arm member so as to be able to move forward and backward in a direction opposite to the stopper cam member and that limits the rotation amount of the arm member in the roller pressing direction by contacting the stopper cam member; Adjustable stopper part that can be attached A feed screw rod that is connected to a material and that moves the adjustable stopper member forward and backward in a direction opposite to the stopper cam member by rotation, and a rotary drive actuator that rotationally drives the feed screw rod. Roller nip amount adjustment device for offset printing machines. 2. The feed screw rod has a first screw portion screwed into a nut member attached to the arm member, and a second screw portion screwed into a screw hole provided in the adjustable stopper member. 2. The offset printing machine according to claim 1, wherein the first screw part and the second screw part have different screw pitches to form a differential feed screw. Roller nip amount adjusting device. 3. The roller nip amount adjusting device for an offset printing machine according to claim 1, further comprising a rotation amount detector for detecting a rotation amount of the feed screw rod.