JPH045492Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a roll drive device for a winding machine, and particularly to a device for driving rolls in a non-contact manner.

(Prior Art) Conventionally, this type of apparatus includes a two-shaft turret type winder as shown in FIG. Third
In the figure, a pair of turrets 1 (only one turret is shown in the drawing) has cores 2A and 2B rotatably attached to both ends thereof, respectively, which serve as cores for winding paper or film. The film 3 is wound up by the rotational force of the roll 4 (rotational force in the direction of arrow A). Roll 4 is gear 5
It is driven by a motor 6 via. In order to prevent air from being drawn in at the time of winding, the rotating shaft of the roll 4 is pressed by a pair of pressure cylinders 7 in a direction that presses against the paper being wound up. This pressing force is controlled depending on the paper thickness, paper quality, etc., for example. When the winding onto the core 2A is completed, the turret 1 is rotated and the winding onto the core 2B is performed.

(Problem to be solved by the invention) The members driven by the pressure cylinder 7 include not only the roll 4 but also the gear 5 and the motor 6, so their total weight is quite large. ) When applying the pneumatic pressure in step 7 using an electro-pneumatic converter, there is a problem that the pressing force control accuracy and control responsiveness are insufficient.
In addition, undesirable vibrations are likely to occur in the transmission mechanism (gears, couplings, etc.) between the motor 6 and the roll 4, and this vibration hinders the smooth rotation of the roll 4, resulting in normal winding of paper, etc. There was an inconvenience that the collection was not carried out. The present invention aims to eliminate the drawbacks of the conventional technology, to control the pressure of the winding machine roll with high precision and high control responsiveness, and to simplify the roll drive mechanism and reduce vibration. .

(Means for Solving the Problems) In the present invention, the winding machine roll is driven non-contact by an induction motor, so that the only member driven by the pressure cylinder is the roll. , thereby achieving the above-mentioned object of the present invention.

(Example) Embodiments of the present invention shown in the drawings will be described in detail below.

FIG. 1 shows the main structure of a two-shaft turret type winder according to the present invention, and parts that are the same or equivalent to those shown in FIG. 3 will be described with the same reference numerals. A reaction plate 8 is attached to one side of the roll 4, and an induction motor 9 is provided opposite the reaction plate 8. The reaction plate 8 is made of a material that does not generate any attraction or repulsion force by the induction motor 9, such as a combination of iron and aluminum. The roll 4 is driven by the thrust of an induction motor 9. That is, due to the current flowing through the coil of the induction motor 9 in FIG. 2, magnetic forces (thrust forces) in opposite directions are applied to the reaction plates 8 (for example, two aluminum plates) in FIG. 1, as shown by the arrows. As a result, a couple of forces centered on the axis of the roll 4 are generated, and as a result, the roll 4 can rotate and wind up the paper or film. The operating principle of this motor is similar to that of a squirrel cage induction motor. Since the pressing force of the pressure cylinder 7 is applied to one shaft of the roll 4 and the induction motor 9, only the roll 4 is driven by the pressure cylinder 7.

Next, the control of the rotation speed of the roll 4 will be explained with reference to FIG. 2. A rotation speed detector TG that detects the rotation speed of the roll 4 is connected to the shaft of the roll 4, and its output commands the rotation speed of the roll. The signal is applied to the rotation speed control circuit 13 via the amplifier 12 along with the output of the rotation speed command device 11 that generates the signal. 14 is an AC power source. The rotational speed control circuit 13 may be of a frequency control type using a so-called inverter, or may be of a primary voltage control type using a thyristor. With this configuration, the rotational speed of the roll 4 and its fluctuation component are given to the control circuit 13 via the amplifier 12, so the control circuit 13 applies a frequency or voltage to the induction motor such that the fluctuation component becomes zero. As a result, the induction motor 9, that is, the roll 4, can always maintain a predetermined rotation speed with high precision. Further, if it is desired to change the predetermined rotation speed, it is possible to obtain an arbitrary rotation speed by adjusting the rotation speed command device 11.

In the embodiments of the present invention described above, the induction motor is used only on one side of the roll, but it is also possible to drive the roll by installing induction motors on both sides of the roll. In this case, the attraction forces of both induction motors act to cancel each other out, which is more convenient.

(Effects of the present invention) According to the present invention having the above configuration, since gears, motors, etc. are not used as in the conventional example, it is sufficient for the pressure cylinder to drive only the rolls, so there is no need to drive the parts that must be driven. As a result of the significant weight reduction, the pressing force control accuracy and control responsiveness can be improved.

Since the rolls are driven without contact, even if vibrations occur in a drive source such as an induction motor, the vibrations are not transmitted to the rolls, and therefore the rolls can rotate smoothly. In addition, when the roll is pressed and vibrated by the pressure cylinder, the positional relationship between the fixed induction motor and the side surface of the roll may be misaligned, which may cause fluctuations in the driving thrust. Even so, it is possible to always keep the rotation speed of the roll constant by performing feedback control using a rotation detector as in the above embodiment.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of the present invention;
FIG. 2 is a block circuit diagram showing control of the roll rotation speed in the embodiment shown in FIG. 1, and FIG. 3 is a plan view schematically showing a roll drive device of a conventional winding machine. 1... Turret, 2A, 2B... Core, 3...
... Paper, 4 ... Roll, 5 ... Gear, 6 ... Motor, 7 ... Pressure cylinder, 8 ... Reaction plate, 9 ... Induction motor, 10 ... Rotation speed detector,
11... Rotation speed command device, 12... Amplifier, 13...
...Rotation speed control circuit, 14...AC power supply.

Claims (1)

[Scope of utility model registration request] A roll drive device for a winder for winding paper or film onto a roll, comprising: a pressure cylinder attached to at least one axial side of the roll for pressing the roll against the paper or film; an induction motor attached to at least the other shaft side of the roll to rotationally drive the roll without contact using force; and a rotation connected to the shaft of the roll to detect the rotational speed of the roll. a control circuit connected to a coil of the induction motor for inputting an output from the rotation speed detector and controlling the rotation speed of the induction motor to a constant value in accordance with the output; A roll drive device for a winder, characterized by comprising: