JP4532057B2 - Method and apparatus for controlling motor of paper tube manufacturing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor control method and apparatus for a paper tube manufacturing apparatus.
[0002]
[Prior art]
In a conventional paper tube manufacturing apparatus, a pair of base cylinders that run an endless belt wound around a mandrel is driven by an electric motor. The endless belt wound around the mandrel is pulled by one base tube and fed out from the other belt. Therefore, the tension of the belt portion pulled from the mandrel toward one base tube is larger than the tension of the belt portion fed from the other base tube to the mandrel. For this reason, there is a problem that a gap is generated between the endless belt and the mandrel, and the manufactured paper tube is opened or overlapped.
[0003]
[Problems to be solved by the invention]
Japanese Patent Application Laid-Open No. 7-40474 proposes an electric motor that drives each base cylinder directly to each base cylinder and that each electric motor is independently driven at a different speed ratio. In practice, however, it is difficult to set the ratio, and the ratio must be set each time depending on the manufacturing conditions such as the type of paper tape and the thickness of the paper tube.
[0004]
The present invention has been made in view of such problems, and easily and quickly controls the rotational speed of an electric motor that drives a base cylinder that travels an endless belt wound around a mandrel, so that there are no openings or overlaps. It is an object of the present invention to provide a motor control method and apparatus for a paper tube manufacturing apparatus capable of manufacturing a paper tube.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first aspect of the present invention is that an endless belt wound around a straight mandrel is passed over at least two base cylinders, and the first electric motor is attached to the base cylinder on the side where the endless belt is pulled from the mandrel. The endless belt is caused to travel by directly connecting the second electric motor to the base cylinder on the side where the endless belt is fed to the mandrel and driving the first electric motor and the second electric motor. In a motor control method of a paper tube manufacturing apparatus for supplying a paper tape between a belt and the mandrel to form a paper tube along the mandrel, the first rotational speed is set by a first speed control command from a main speed setting means. The first speed control means outputs a control signal to the first electric motor so that one electric motor is driven, The first speed control means outputs the first speed control command from the main speed setting means to the second speed control means, and the second speed is set at the rotational speed set by the first speed control command from the first speed control means. The second speed control means outputs a control signal to the second electric motor so that the electric motor is driven, the load increases during paper tube formation, and the rotational speed of the first electric motor is set to the main speed setting. When the rotational speed set by the means decreases by a predetermined value or more, the first speed control means outputs a second speed control command to the second speed control means instead of the first speed control command so as to rotate at the rotational speed. To do .
[0006]
According to a second aspect of the present invention, an endless belt wound around a straight mandrel is wound around at least two base cylinders, a first electric motor is directly connected to a base cylinder on the side where the endless belt is pulled from the mandrel, and the endless belt is connected to the mandrel. A paper tape is provided between the endless belt and the mandrel while a second electric motor is directly connected to the base cylinder on the side from which the belt is fed and the endless belt is driven by driving the first electric motor and the second electric motor. In the motor controller of the paper tube manufacturing apparatus that forms a paper tube along the mandrel, the rotational speeds of the first electric motor and the second electric motor are set, and the motor is rotated at the set rotational speed. a main speed setting means for outputting a first speed control command to the first speed control means, detects the rotational speed of the first electric motor That a first speed detecting means, and a second speed detecting means for detecting a rotational speed of the second electric motor, the first speed control means, first the first electric motor from said main speed setting means A control signal is output to the first electric motor based on the rotational speed detected by the first speed detecting means so as to rotate at a set rotational speed based on a one- speed control command, and a first signal from the main speed setting means is output . 1 speed control command is output to the second speed control means, and the second speed control means is configured so that the second electric motor rotates at a set rotational speed based on the first speed control command from the first speed control means. A control signal is output to the second electric motor based on the rotational speed detected by the second speed detecting means , and the first speed control means further increases the load during paper tube formation to increase the first 1 speed detection hand Rotational speed of the first electric motor detected by the, the main the drops more than a predetermined value than the rotational speed set by the speed setting means, the second instead of the first speed control command to rotate at the rotational speed A second speed control command is output to the speed control means.
[0007]
In the present invention, when the load increases during paper tube manufacturing and the rotation speed of the first electric motor decreases below the rotation speed of the second electric motor, the rotation speed of the first electric motor is detected, and the detected rotation speed is used. Since the first speed control means for controlling the first electric motor transmits the second speed control signal to the second speed control means for controlling the second electric motor so that the second electric motor is driven, the first electric motor There is no difference in the number of revolutions of the second electric motor, and a paper tube having no openings or overlaps can be manufactured.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0009]
1 and 2 show a paper tube manufacturing apparatus used for carrying out the method according to the present invention. This paper tube manufacturing apparatus includes a straight tubular mandrel 3 that is horizontally fixed to the side of a head 2 provided on a base 1, and a pair of first base cylinder 4 a and second base that are erected on both sides of the mandrel 3. It consists of a cylinder 4b and an endless belt 5 wound around the mandrel 3 and wound around the pair of base cylinders 4a and 4b.
[0010]
The base cylinders 4a and 4b are erected on a base cylinder support base 6, which are directly connected to a first electric motor 7a and a second electric motor 7b disposed at the bottom of the base cylinder support base 6, respectively. It is designed to rotate. The base tube support base 6 is provided so as to be rotatable in the horizontal direction with respect to the base base 1 and can set an entry angle of the endless belt 5 with respect to the mandrel 3. The interval between the base tubes 4a and 4b can be adjusted by a known slide mechanism. Further, the winding direction of the paper tube 8 can be changed by changing the positional relationship between the upstream side and the downstream side of the base tubes 4a and 4b.
[0011]
The endless belt 5 is wound around one first base tube 4a, then twisted 90 ° and wound around the mandrel 3, and then twisted 90 ° and wound around the other second base tube 4b. Then, it is twisted 180 ° and returned to the first base tube 4a.
[0012]
FIG. 3 shows a control device for the electric motors 7a and 7b. The control device includes a main speed setter 9, a first speed controller 10a, a second speed controller 10b, and a first electric motor 7a. It consists of a first speed detector 11a for detecting the rotational speed and a second speed detector 11b for detecting the rotational speed of the second electric motor 7b.
[0013]
The main speed setter 9 manually sets the rotation speed of the first electric motor 7a, and outputs a speed control command to the first speed controller 10a so that the first electric motor 7a rotates at the set rotation speed. To do.
[0014]
The first speed controller 10a and the second speed controller 10b are connected to a three-phase AC power source, and output control signals (voltages) to the first electric motor 7a and the second electric motor 7b, respectively. The motor 7a and the second electric motor 7b are rotationally driven at the commanded rotational speed. The first speed controller 10a outputs a speed command to the second speed controller 10b. Therefore, the first speed controller 10a also serves as a speed commander for the second speed controller 10b.
[0015]
The first speed detector 11a and the second speed detector 11b are each composed of an encoder, detect the rotational speeds of the first electric motor 7a and the second electric motor 7b, and the first speed controller 10a and the second speed controller. To 10b.
[0016]
The operation of the paper tube manufacturing apparatus having the above configuration, particularly the operation of the speed control apparatus will be described.
[0017]
First, the rotation speed of the base cylinders 4a and 4b is set by the main speed setting device 9 in consideration of the diameter and thickness of the paper tube 8 to be manufactured, the material and thickness of the paper tape 12, and the like. If it is set to rotate at a rotation speed of 10, the main speed setting device 9 issues a first speed control command of 10 to the first speed controller 10a. Then, the first speed controller 10a issues ten first speed control commands to the second speed controller 10b. Thereby, the 1st speed controller 10a and the 2nd speed controller 10b output a control signal (voltage) to the 1st electric motor 7a and the 2nd electric motor 7b so that it may rotate at the rotation speed of 10 respectively. As a result, the first electric motor 7a and the second electric motor 7b are driven, the first base cylinder 4a and the second base cylinder 4b are rotated at a rotational speed of 10, and the endless belt 5 is driven. The actual rotational speeds of the first electric motor 7a and the second electric motor 7b are detected by the first speed detector 11a and the second speed detector 11b, respectively, and the first speed controller 10a and the second speed controller are detected. 10b is fed back. The first speed controller 10a and the second speed controller 10b adjust the control signal based on the detected actual rotational speed so as to obtain the rotational speed as commanded.
[0018]
Next, when a predetermined paper tape 12 is supplied between the endless belt 5 and the mandrel 3, the paper tape 12 is wound around the mandrel 3, and the paper tube 8 is formed along the axial direction of the mandrel 3. While the paper tube is being formed, the load of the first electric motor 7a and the second electric motor 7b increases, but the load of the first electric motor 7a of the first base cylinder 4a on the side where the endless belt 5 is pulled from the mandrel 3 is endless. It becomes larger than the load of the second electric motor 7b of the second base cylinder 4b on the side where the belt 5 is fed to the mandrel 3. As a result, a difference occurs in the rotational speed between the first electric motor 7a and the second electric motor 7b, and the paper tube 8 is opened and overlapped, resulting in a product defect.
[0019]
Therefore, in the present invention, when the load increases during paper tube formation, the rotational speeds of the first electric motor 7a and the second electric motor 7b are automatically adjusted. That is, the rotation speed of the first electric motor 7a is periodically detected by the first speed detector 11b and fed back to the first speed controller 10a. Assuming that the detected speed is lower than the set speed of 10 and that the speed is reduced to 8, the first speed controller 10a has a speed of 8 at the second speed controller 10b. A second speed control command A is issued so as to rotate. Thereby, the 2nd speed controller 10b outputs a control signal (voltage) so that it may rotate at the rotational speed of 8 to the 2nd electric motor 7b. As a result, the rotation speeds of the first electric motor 7a and the second electric motor 7b coincide with each other. It is possible to form a paper tube 8 that is balanced and has no openings or overlaps.
[0020]
【The invention's effect】
As is apparent from the above description, according to the present invention, when the load increases during the manufacture of the paper tube and the rotational speed of the first electric motor falls below the rotational speed of the second electric motor, the rotation of the first electric motor is performed. detecting the speed, so that the second electric motor at the detected rotational speed is driven, the second speed to the second speed control means for first speed control means for controlling the first electric motor controls the second electric motor Sends a control signal to eliminate the difference in rotation speed between the first electric motor and the second electric motor, so that it can be controlled quickly with a simple configuration, and a paper tube with no openings or overlaps is manufactured. can do.
[Brief description of the drawings]
FIG. 1 is a front view of a paper tube manufacturing apparatus.
FIG. 2 is a plan view of the paper tube manufacturing apparatus of FIG.
FIG. 3 is a block diagram of a control device.
[Explanation of symbols]
3 mandrel 4a second base cylinder 4b second base cylinder 5 endless belt 7a first electric motor 7b second electric motor 8 paper tube 9 main speed setting device 10a first speed controller, speed command device 10b second speed controller 11a First speed detector 11b Second speed detector 12 Paper tape

Claims (2)

An endless belt wound around a straight mandrel is stretched over at least two base cylinders, a first electric motor is directly connected to a base cylinder on the side where the endless belt is pulled from the mandrel, and the endless belt is fed to the mandrel. A paper tape is supplied between the endless belt and the mandrel while running the endless belt by directly connecting the second electric motor to the base cylinder and driving the first electric motor and the second electric motor. In a motor control method of a paper tube manufacturing apparatus that forms a paper tube along a mandrel,
The first speed control means outputs a control signal to the first electric motor so that the first electric motor is driven at the set rotational speed according to the first speed control command from the main speed setting means,
The first speed control means outputs the first speed control command from the main speed setting means to the second speed control means,
The second speed control means outputs a control signal to the second electric motor so that the second electric motor is driven at a set rotational speed according to a first speed control command from the first speed control means;
When the load increases during the formation of the paper tube and the rotational speed of the first electric motor decreases by a predetermined value or more from the rotational speed set by the main speed setting means, the first speed control is performed so that the first electric motor rotates at the rotational speed. A means for outputting a second speed control command to the second speed control means instead of the first speed control command . An endless belt wound around a straight mandrel is stretched over at least two base cylinders, a first electric motor is directly connected to a base cylinder on the side where the endless belt is pulled from the mandrel, and the endless belt is fed to the mandrel. A paper tape is supplied between the endless belt and the mandrel while running the endless belt by directly connecting the second electric motor to the base cylinder and driving the first electric motor and the second electric motor. In a motor control device of a paper tube manufacturing apparatus that forms a paper tube along a mandrel,
Main speed setting means for setting rotation speeds of the first electric motor and the second electric motor, and outputting a first speed control command to the first speed control means so as to rotate at the set rotation speed;
First speed detecting means for detecting the rotational speed of the first electric motor;
Second speed detecting means for detecting the rotational speed of the second electric motor ;
The first speed control means is based on the rotation speed detected by the first speed detection means so that the first electric motor rotates at a set rotation speed according to a first speed control command from the main speed setting means. Output a control signal to the first electric motor, and output a first speed control command from the main speed setting means to the second speed control means,
The second speed control means adjusts the rotation speed detected by the second speed detection means so that the second electric motor rotates at a set rotation speed according to a first speed control command from the first speed control means. Based on the control signal to the second electric motor ,
The first speed control means is configured such that the rotation speed of the first electric motor detected by the first speed detection means is increased by the load during paper tube formation from a rotation speed set by the main speed setting means. A motor control device for a paper tube manufacturing apparatus, wherein a second speed control command is output to the second speed control means in place of the first speed control command so as to rotate at the rotational speed when the value decreases by a value or more .

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