JPH05338873A - Near roller device for use in winding portion of printing machine, etc. - Google Patents

Abstract

PURPOSE:To always automatically hold constant the distance between a near roller and a winding roller irrespective of increase in the diameter of the winding roller by detecting the distance between the near roller and the winding roller, and moving the near roller according to the result of that detection. CONSTITUTION:A printed film 21 is wound to a winding roller 24 via tension rollers 22, 23 and a near roller 14, the tension rollers 22, 23 being provided to a plate 15 and a splice arm 13, respectively. In this case, the distance between the near roller 14 and the winding roller 24 is detected by an ultrasonic sensor 20 disposed at the upper end of the splice arm 13. When the detected value of the distance is smaller than a reference value, the piston rod 18 of a hydraulic cylinder 17 is shortened. The splice arm 13 is thereby oscillated, so separating the near roller 14 from the winding arm 24; i.e., as the diameter of the winding roller 24 increases the near roller 14 is separated therefrom so that the distance therebetween is always held constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing machine such as a gravure printing machine or an offset printing machine, or a near-roll device for a film (including paper) winding section such as a slitter.

[0002]

2. Description of the Related Art In a winding part of a gravure printing machine, a near roll is used to wind up a film wound with a winding roll so that the ends of the film are aligned to clean up the film and wrinkles do not occur on the film. Has been. A conventional near-roll device will be described with reference to FIG.
41 is a splice arm, on which a near roll 42 is mounted. The lower end of the splice arm 41 is supported by a shaft 43 and is swingable, and a gear 44 that rotates together with the splice arm 41 is attached around the shaft 43. Further, the gear 44 meshes with the gear 46 of the cam-equipped gear 45, and when the splice arm 41 swings, the cam 47 of the cam-equipped gear 45 rotates via the gears 44 and 46 to operate the air pressure reducing valve 48. By doing so, the air pressure supplied to the air cylinder 49 changes according to the swing angle of the splice arm 41. Further, 50 is a winding roll arranged in the winding portion of the gravure printing machine, and the film 51 printed by the printing machine is wound around the winding roll 50 via the tension roll 52 and the near roll 42. In the conventional near roll device as described above, the pressure of the cylinder 49 is adjusted while the film 51 is being wound, and the near roll 4
The splice arm 41 is gradually pushed back as the diameter of the take-up roll 50 is increased while the tension of the film 51 is applied to the film 2 for balancing.

[0003]

However, the conventional near-roll device is not actually working well for the following reasons. Since the weight of the entire arm is large and the friction of each part is large, the delicate acting force of the film tension cannot be enough to push back the splice arm. Since the film tension varies depending on various conditions such as the type, shape, and environment of the film, and also changes due to the taper tension, it is not appropriate to control the swing of the splice arm based only on the film tension force. .. The moment generated when the splice arm falls down changes in a sine wave (sine curve) shape, but since the cam has a linear shape, the force is unbalanced depending on the swing angle of the splice arm. Basically, the near roll should control the position based on the distance from the take-up roll, not the tension force. Therefore, in reality, when the take-up roll becomes large, a worker manually pushes back the splice arm to adjust the position of the near roll.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above technical problems and to provide a near roll device capable of allowing a near roll to escape while keeping a gap constant as the diameter of a winding roll increases. And In order to achieve such an object, a near roll is movably provided with respect to a film take-up roll arranged in a take-up part of a printing machine and a sensor for detecting a distance between the near roll and the take-up roll is provided. Based on the distance detected by, the near roll is moved to keep the distance between them constant. Then, the near roll is attached to a splice arm, and the swing position of the splice arm is adjusted by a hydraulic cylinder to move the near roll.
An ultrasonic sensor was used as the above sensor.

[0005]

The sensor detects the distance between the near roll and the take-up roll, and the near roll is moved based on the detected distance to keep the distance between them constant.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a winding unit of a gravure printing machine.
Reference numeral 10 is a stand, and a main tube 12 of a winding roll is attached to both ends of a revolving arm 11 pivotally supported above the stand. An adhesive tape is attached to the surface of the main pipe 12.
Reference numeral 13 is a splice arm, on which a near roll 14 is mounted. A lower end of the splice arm 13 is pivotally supported by a plate 15 so as to be swingable, and a piston rod 18 of a hydraulic cylinder 17 is connected below the splice arm 13. Also, splice arm 1
A cutter 19 and an ultrasonic sensor 20 are attached to the upper end of 3. Then, the film 21 printed by the printing machine is wound by the main roll 12 via the tension roll 22 provided on the plate 15, the tension roll 23 provided on the splice arm 13, and the near roll 14 to form a take-up roll 24. It is a thing.

In the winding section as described above, the near roll 14 and the winding roll 24 are detected by the ultrasonic sensor 20.
Is detected, and the hydraulic cylinder 17 is operated based on the distance to move the near roll 14 to keep the distance from the take-up roll 24 constant. FIG. 2 is a hydraulic pressure supply circuit diagram for the hydraulic cylinder 17, and a shortening hydraulic pressure supply circuit 27 and an expanding hydraulic pressure supply circuit 28 are connected to the upper chamber and the lower chamber of the hydraulic cylinder 17, respectively. A switching valve 29 for ensuring safety is provided between the shortening hydraulic pressure supply circuit 27 and the extension hydraulic pressure supply circuit 28.
Is provided. The other end sides of the shortening side hydraulic pressure supply circuit 27 and the extension side hydraulic pressure supply circuit 28 are connected to hydro units 30 and 31 for switching between hydraulic pressure and air pressure, respectively. Air is supplied appropriately. The distance between the near roll 14 and the take-up roll 24 detected by the ultrasonic sensor 20 is sent to the amplifier 35. A reference value is set in advance in the amplifier 35, and when the distance detected by the ultrasonic sensor 20 becomes less than the reference value, the amplifier 35 outputs an ON signal to the solenoid valve 36, and When the solenoid valve 36 is turned on, the air operated valve 37 in the extension hydraulic pressure supply circuit 28 is opened.

In the near-roll apparatus as described above, however, the film 21 printed by the printing machine is the plate 1
It is wound by a winding roll 24 via the tension roll 22 provided on the No. 5, the tension roll 23 provided on the splice arm 13, and the near roll 14. The ultrasonic sensor 20 provided at the upper end of the splice arm 13 detects the distance between the near roll 14 and the winding roll 24, and the detected value is sequentially transmitted to the amplifier 35. A desired reference value such as 220 mm is preset in the amplifier 35. The diameter of the winding roll 24 gradually increases as the winding amount of the film 21 increases.
The distance between the surface and the near roll 14 gradually becomes shorter. Then, the distance detected by the ultrasonic sensor 20 is a reference value (for example, 220 m) set in the amplifier 35.
If less than m), the ON signal is output from the amplifier 35 to the solenoid valve 36, and the air operate valve 37 of the extension hydraulic pressure supply circuit 28 is opened. In this way, by opening the air operate valve 37, oil escapes from the extension side hydraulic pressure supply circuit 28 to the hydro unit 31 to lower the pressure in the lower chamber of the hydraulic cylinder 17, and the pressure in the upper chamber causes the piston of the hydraulic cylinder 17 to move. The rod 18 is shortened. As a result, the splice arm 13 swings, and the near roll 14 moves so as to escape from the winding roll 24. In this way, the near roll 14 is moved by a fixed amount (for example, 10 mm) by keeping the air operated valve 37 in the open state for a while, and the surface of the take-up roll 24 and the near roll 14 are moved by the ultrasonic sensor 20.
When it is detected that the distance is larger than a reference value (for example, 220 mm), an OFF signal is output from the amplifier 35 to the electromagnetic valve 36, and the air operated valve 37 of the extension hydraulic pressure supply circuit 28 is returned to the closed state.

Thereafter, the same process is repeated, and when the distance between the surface of the winding roll 24 and the near roll 14 becomes smaller than the reference value again, the near roll 14 is moved by the hydraulic cylinder 17 and thus, the winding roll is always operated. Keeping the distance from 24 within a certain range, near roll 14
The winding roll 24 is formed while aligning the ends of the film 21. Thus, when the winding of one winding roll 24 mounted on the turning arm 11 is completed, the other main pipe 1
2 is rotated, the revolving arm 11 is rotated 180 °, and when the rotational speeds of the main pipes 12 at both ends of the revolving arm 11 become equal, the film 21 is cut by the cutter 19. At the same time as cutting, the leading end of the film is attached to the adhesive tape on the surface of the other main pipe 12, and the same process is repeated again, whereby the next winding roll 24 is wound.

Although the embodiment of the present invention has been described above based on the winding portion of the gravure printing machine, the near-roll device of the present invention can be applied to other types of printing machines such as offset printing machines and films such as slitters. It can also be applied to the winding section of. Further, the object to be wound is not limited to a film, and may be paper or the like. The material is not particularly limited, and it can be applied as long as it is a continuous raw material wound.

[0011]

According to the near roll device of the present invention, since the near roll is moved by the position control based on the distance from the take-up roll, the near-roll can be released as the diameter of the take-up roll increases. The distance between the near roll and the take-up roll can always be kept constant. Therefore, it is convenient because an operator does not have to manually push back the splice arm as in the conventional case. In particular, the use of an ultrasonic sensor has the advantage that the distance between the near roll and the winding roll can be measured regardless of the type of film. Therefore, it can be applied to transparent materials such as transparent films and strong reflective materials such as aluminum films. Further, it is advantageous to use a hydraulic cylinder to move the near roll because the near roll can be gradually moved.

[Brief description of drawings]

FIG. 1 is a front view of a winding section.

[Fig. 2] Hydraulic supply circuit diagram

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 13 Splice Arm 14 Near Roll 17 Hydraulic Cylinder 20 Ultrasonic Sensor 21 Film 24 Winding Roll

Claims (3)

[Claims] 1. A near roll is provided movably with respect to a film take-up roll arranged at a take-up portion of a printing machine and a sensor for detecting a distance between the near roll and the take-up roll is provided. A near-roll device in a winding section of a printing machine or the like configured to move the near-roll based on the detected distance to keep the distance between them constant. 2. The winding unit of a printing machine or the like according to claim 1, wherein the near roll is attached to a splice arm, and the swing position of the splice arm is adjusted by a hydraulic cylinder to move the near roll. Near-roll equipment in Japan. 3. A near-roll device for a winding section of a printing machine or the like according to claim 1, wherein an ultrasonic sensor is used as the sensor.