JPS5827184B2 - Roll paper center alignment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a web centering method for aligning the center hole of the web with the position of the chucking cone of the paper feeder when the web is automatically loaded onto the paper feeder of a rotary printing press or the like. It is about the method.

FIGS. 1 and 2 show typical examples of conventional web centering devices.

In the web centering device shown in FIG. 1, when a web 3 is loaded on a winding and conveying device 4 and moved in the direction of arrow A by a motor 5, the light emitting portion 2a of the transmission type phototube is moved from the position of the limit switch 1.
, the distance to the light receiving section 2 is t, and the radius of the web 3 is t1, and the distance from the outer diameter of the web 3 to the phototubes 2a, 2 is t2, then the radius t of the web 3 is t-t2, and the winding and conveying device Counting starts from the time when the limit switch 1 is activated by a signal from a pulse generator 6 that generates pulses according to the distance traveled by the photocell 2a, and the pulses continue until the light between the light emitting part and the light receiving part 2 of the phototube 2a is blocked. If you count l-2, you can find t
Since is constant, tl can be found.

By determining the radius t1 of the paper roll 3, the amount of subsequent movement of the winding and conveying device 4 and the amount of rotation of the arm 5 are calculated to match the center position of the winding diameter and the chucking position.

This web centering device moves two elements after determining the roll diameter, so the control device is complicated, and the center hole position is determined by measuring the outside diameter of the roll, so the appearance of the roll is distorted. There is a drawback that errors may occur if the

The roll paper centering device shown in FIG. 2 fixes the rotation stop position of the arm 7 with the tilt switch 8, moves the roll paper 9 directly below the chucking device 10 and raises it with the lid 11, and the phototube 12 moves the roll paper 9 is detected, the electromagnet 13 is energized, the block 15 is fixed to the guide pawl 14 of the lifter 11, and the block 15 is raised together with the lifter 11 and stopped by the limit switch 16.

The distance t1 between the electromagnet 13 and the limit switch 16 and the distance t between the chucking device 10 and the phototube 12
2 are set to be the same, the center hole of the paper roll 9 and the center position of the chucking device 10 will match.

Although the control of this web centering device is simple, since the block 15 is fixed to the guide pa 14 or is made free, there is an element that tends to be mechanically unstable.

In addition, the phototube 12 must be placed on the perpendicular line to the center of the chucking part, and as shown in Figure 2-2, the arm 7 is large and has a strong surface and a chucking mechanism, so the installation of the phototube 12 is difficult. becomes difficult.

Furthermore, in addition to the conventional paper web centering device shown in FIGS. 1 and 2, there is also Japanese Patent Application Laid-open No. 47-16206 (hereinafter referred to as the conventional example).

In this conventional example, a roll conveying device (trolley) that transports the roll is loaded with a lifter that detects the rising height of the roll and raises the roll to a required height in order to attach the roll to the three-pronged arm.

In this conventional train, the drive sources for raising and lowering the lifter include, for example, hydraulic pressure and electricity, but these drive sources require hydraulic and electrical parts such as a hydraulic pump motor, an electric motor for vertical movement, a solenoid valve, and a limit switch. Therefore, the power supply equipment including the puff part and the signal part for this purpose also needs to be complicated and expensive.

Additionally, the number of winding and conveying devices is generally greater than the number of machines.

This is used in the case of a looped conveyance path such as a newspaper rotary, and is used when it is necessary to change the paper roll, but making the conveyance path into a loop requires a lot of time for maintenance and inspection. However, the facilities are vast.

The present invention was made in consideration of these points, and its purpose is to simplify the roll paper conveying device, improve the energy and signal transmission method, and reduce the size of the device, thereby achieving reliability with an inexpensive system. The present invention provides a method for centering a web.

In order to achieve this objective, the present invention stops an arm that grasps the web at a fixed position, and then detects the center hole position of the web by stopping the web while it is being conveyed in the horizontal direction or stopping the web for a while. A device for moving the web from a position opposite to the mounting position of the arm to the central hole position of the web using a drive source, converts the mechanical movement amount into an electrical analog amount, and then moves the web in the horizontal direction. After being conveyed to , the web is raised by a lifter that raises the web using the electric analog amount, and the lifting amount of the lifter is converted back to an electric analog amount, which is compared with the electric analog amount by a differential amplifier, and the web is raised by the electric analog amount. It is characterized in that the center hole position of the paper roll is aligned with the position where the paper roll is attached to the arm.

The details of the present invention will be explained below with reference to the drawings.

FIG. 3 is a schematic diagram showing a method for centering a web according to an embodiment of the present invention, and the same parts as those in FIG. 2 are designated by the same symbols and the explanation thereof will be omitted.

Reference numeral 21 denotes a paper roll conveying device on which a paper roll 22 is placed, and is moved horizontally from side to side in the figure by a drive source (not shown).

Reference numeral 23 denotes a center hole position detection device for detecting the center hole 27 of the web 22, and the device 23 is placed close to the side surface of the web 22 as shown in FIG.

FIG. 4 shows the mechanism of the center hole position detection device 23. The phototubes 24 and 25 are each of a reflective type and are fixed to a mounting plate 26, and the pitch between these phototubes 24 and 25 is The dimensions are set so that the chucking cones 10 provided at both ends of the arm 5 can enter the center hole 27 of the web 22.

The mounting plate 26 to which the phototubes 24 and 25 are mounted is connected to the motor 28.
The motor 28 is screwed onto a screw shaft 29 rotated by
is moved in the vertical direction via the screw shaft 29.

30 is a potentiometer that is interlocked with the mounting plate 26, and its resistance value changes depending on the amount of movement of the phototube 24, 25.

31 is a slot switch that detects the upper limit of the mounting plate 26;
32 is a limit switch 3 that detects the lower limit of the mounting plate 26
1, the photocell 24 is activated at the position where the limit switch 31 is activated.
The height of the intermediate position of the phototube 25 and the phototube 25 is made to coincide with the center of the chucking cone 10 from the floor surface.

Reference numeral 33 denotes a lifter which can be moved up and down via a screw shaft 34 by the drive of a motor 40, and the resistance value of the potentiometer 35 changes in accordance with the amount of this up and down movement.

36 is a limit switch that detects the upper limit of the lifter 33;
37 is a limit switch that detects the lower limit of the lifter 33.

Figure 5 is an electrical system diagram of the present invention, 41 and 43 to 46 and 59.
is a knot, 42 and 60 are ors, 47-51 are ands, 5
2 to 56 are relays, and 57 is a differential amplifier.

The differential amplifier 57 compares the potentiometer 30 and the potentiometer 35, and if the potentiometer 30 is large and the potentiometer 35 is small, the U signal is ONL,
If the potentiometer 30 is small and the potentiometer 35 is large, the D signal is ONL, and if the potentiometers 30 and 35 match, both the U and D signals are OF.
This is an amplifier that becomes F.

Next, the operation of the present invention will be explained.

The paper roll conveying device 21 loaded with the paper roll 22 moves in the horizontal direction and temporarily stops at a position where the center hole 27 of the paper roll 22 is detected by the center hole position detection device 23, which is the operating point of the limit switch 38.

When the web conveying device 21 stops, the limit switch 38
is ON.

The limit switch 32 is OFF and the output of the knot 41 is 1.
”, the chucking completion signal 58 is OFF, the output of the knot 45 is L 119, the phototube 24 is the phototube 25 is the paper roll 22
There is reflected light from the side surface of , the output is 1, the output of the OR 42 is also 1, the output of the AND 48 is 1'', the relay 53 is energized, and the motor 28 is rotated by its contact.

Therefore, the mounting plate 26 continues to descend via the screw shaft 29, and the reflected light from the phototubes 24 and 250 is transmitted to the center hole 2 of the web 22.
When reaching point 7, both reflected lights become 0'', and the output of AND 48 becomes 0'', the relay 53 is deenergized, its contacts open, and the motor 28 is stopped.

Note that if the center hole 27 of the paper web 22 is small or misaligned, the output of the OR 42 will be 1" because there will be reflected light from one or both of the phototubes 24 and 25, and the mounting plate 26 will not fit the center hole 27. Even if it passes, it continues to descend □ When the seat switch 32 is activated, the relay 5
2 operates and issues an alarm signal indicating an abnormality in the center hole 27 of the web 22, and the output of the knot 41 becomes L% 019, so the motor 28 stops and stops descending.

In this way, it can also be determined whether the size of the center hole 27 allows insertion of the chucking cone 10.

Then, if the center hole 27 is of an appropriate size, the mounting plate 26
stops at the center hole 27 position, and the resistance value changes by the amount by which the resistance value of the potentiometer 30, which was interlocked with the mounting plate 26, has moved.

When the measurement of the center hole 27 is completed, the center hole position detection device 23 stops in the measured state, and the web conveying device 21 moves to the right in the figure again, and when it comes under the chucking cone 10, the limit switch 39 is activated. Stop.

When the web conveying device 21 stops, the lid 33 compares the potentiometer 30 of the center hole position detection device 23 and the potentiometer 35 of the lifter 33 using a differential amplifier 57, and the amplifier 57 compares the potentiometer 30 with the potentiometer 3.
Since it is larger than 5, the signal of U becomes '1'', the output of AND50 becomes It1jj, and the relay 55 is energized, and the contact rotates the motor 40 in the direction of lifting the lifter 33, and the screw shaft 34 is rotated. rise through.

At this time, potentiometer 30 and potentiometer 35
When they match, the U signal of the differential amplifier 57 becomes t On, the output of the AND 50 becomes O'', the relay 55 is deenergized, the motor 40 stops, and the lifter 33 stops.

Then, in the stopped state, the center hole 27 and the chucking cone 10 are set so that the amount by which the potentiometer 30 is lowered and the potentiometer 35 are changed electrically by the same amount of mechanical displacement, so that the center hole 27 and the chucking cone 10 are completely aligned.

On the other hand, if the lifter 33 rises too much for some reason, the differential amplifier 57 sets the D signal to 1'' and the output of the AND 51 becomes t.
t, n, the relay 56 is energized, the motor 40 rotates in the direction of lowering the lifter 33, and the lifter 33 is lowered via the screw shaft 34 until it is aligned.

When the phases of the center hole 27 and the chucking cone 10 match, the paper roll 22 is chucked, and the lifter 33 outputs the output of the AND4T at the chucking completion signal 58.
Within 1pp, that is, while the limit switch 37 is OFF,
The output of the OR 60 becomes tt 1zp, the relay 56 is energized, and the motor 40 rotates to lower the lifter 33 via the screw shaft 34.

On the other hand, the center hole position detection device 23 also has a limit switch 31.
is turned on and the relay 54 is energized until the output of the AND 49 becomes toj'', and the motor 28 rotates in the downward direction and descends.

In this implementation, we explained the case where there is only one center hole position detection device, but if it is installed on the opposite side of the winder, it will not only be possible to determine the shape of the hole on the opposite side, but also the slope of the center hole. If an element that changes the slope is added to -, more accurate chucking can be achieved.

Furthermore, in this embodiment, one set of the roll paper transport device 21 is stopped by the center hole position detection device 23, but by moving the center hole position detection device 23 using another drive source, the roll paper transport device 21 is moved at the same speed as the roll paper transport device 21. The center hole position of the web may be detected while moving it.

As described above, the present invention has the following effects.

■ Since the lifter is not placed on the web conveying device, the structure of the web conveying device becomes extremely simple.

■ Since the lifter is located at a fixed position at the bottom of the paper roll transport device, there is no need for a power supply device for moving parts, which simplifies the structure and facilitates maintenance and inspection.

■ As a roll paper transport device, it is more energy-saving than a trolley with a lifter.

■ The height of the paper roll transport device of the present invention is lower than the conventional one in which a lifter is mounted on a trolley, and therefore the height of the paper feeding device that receives the paper roll can also be lowered, so even if the structure is the same, The rigidity is further improved, resulting in a more stable device.

■ Conventionally, the mechanism of the lifter on the trolley has to be foldable, and the positioning accuracy of the web is not high, but in the case of the present invention, by using a column type, the accuracy of the center position is extremely high. expensive.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a conventional web centering device, FIG. 3 is a schematic diagram of a web centering device showing an embodiment of the present invention, and FIG. 4 is a mechanical diagram of a center hole position detection device. Fifth
The figure is an electrical rotation system diagram of the present invention. 21... Roll paper conveying device, 22... Roll paper, 23.
...Center hole position detection device, 24.25...Phototube, 2
6... Mounting plate, 27... Center hole, 28, 40...
Motor, 29... Screw shaft, 30.35... Potentiometer, 36-39.61... Limit switch,
33-...Lifter, 34...Screw shaft, 41.43-4
6,59... knots, 42.60... or, 47~
51...and, 52-56...relay, 57...
- Differential amplifier, 58...Chucking completion signal.

Claims (1)

[Claims] 1. The arm that grips the web is stopped at a fixed mounting position, and then, while the web is being conveyed horizontally, a device for determining the winding center hole position moves from a position opposite to the winding mounting position to the winding center hole position. It moves along the end surface of the web, converts the mechanical movement into an electrical analog, and then conveys the web in the horizontal direction.The winding lifting device lifts the web using the electrical analog, and converts the amount of rise into an electrical analog. A winding center positioning method characterized in that the center hole position of the web is made to coincide with the mounting position of the winding paper by converting and feedback into an analog value and comparing it with the electrical analog value by a differential amplifier.