JP4003819B2 - Film termination system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film finishing apparatus in a film supply apparatus.
[0002]
[Prior art]
In an apparatus that makes a package using a long film wound in a roll shape, whether to replace the film roll with a new film roll by predicting the end of the film in advance in order to increase the operating rate of the apparatus. It is necessary to add up.
[0003]
In particular, when using a film roll in which the end of the film is fixed to a paper tube with tape, a large pulling force acts abruptly at the end of feeding, and this is based on the transport path. Elongation occurs in all the films, resulting in inconveniences such as changing eye mark intervals and meandering of the film.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to provide a new film termination processing apparatus that can eliminate the tensile force acting on the film acting at the termination.
[0005]
[Means for Solving the Problems]
That is, the present invention is a film terminating device for achieving such a problem, in which a film roll having a film end fixed to a paper tube is wound and the paper tube is held by a support shaft. In the film supply apparatus of the type that rotates and feeds the film, a detecting means for detecting an abnormal tension acting on the film when the film is exhausted from the paper tube by feeding the film, and from the detecting means Control means for stopping the rotation of the support shaft and releasing the restraint on the paper tube based on the abnormality detection output is provided.
[0006]
[Action]
With such a configuration, the paper tube can be made free immediately before the end of feeding, and an excessive pulling force can be prevented from acting on the film, and at the same time, the film can be pulled out by hand and used to the end.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, examples of the present invention will be described below.
The drawing shows a feeding device for a film 4 used in a bag making and packaging machine.
[0008]
In the figure, reference numeral 1 denotes a support shaft for supporting the film roll R, and the film f fed from the film roll R supported by the support shaft 1 is inclined so as to be displaceable in the direction of the support shaft 1 through the guide roller 10. The position of the film 11 is adjusted in the width direction by the rod 11, and further, it is configured to be sent to a former (not shown) through a tension adjusting dancer roller 12. Has already been disclosed in JP-A-5-16917, etc., and further description thereof will be omitted.
[0009]
By the way, the above-described support shaft 1 is configured to rotate by being driven by a film feeding motor 2 acting via a belt 3, and the support shaft 1 is fed as shown in FIG. An inner cylinder 6 that is expanded by the pressurized air and contracted by discharging the pressurized air is provided, and the inner cylinder 6 is expanded to remove a large number of projections 7. It is configured to project from a hole 5 provided in the tube 4 and to hold the paper tube D of the film roll R attached to the outer tube 4 at the tip thereof from the inside to rotate the film roll R together with the support shaft 1. Has been.
[0010]
The support shaft 1 is connected to a pressurized air supply source 9 via an electromagnetic switching valve 8, and the electromagnetic switching valve 8 further detects an output acting on the dancer roller 12 and outputs it from a load cell 15. When an abnormal tension is applied to the dancer roller 12 when operated by the signal, the air in the inner cylinder 6 is discharged and contracted to cut off the driving force transmission to the film roll R. Yes.
[0011]
On the other hand, reference numeral 20 in the figure denotes a film f termination processing control device, which includes a reference value signal output means 21 for outputting this signal with an average tension acting on the film f as a reference value, and a load cell. 15 is compared with the reference value signal from the reference value signal output means 21, and the difference signal is output to the motor control means 23. On the other hand, when the abnormal tension detection signal from the load cell 16 is received, the film The comparison means 22 that outputs an abnormal signal to the end detection means 24, the rotation signal of the film feeding motor 2 is controlled to receive the difference signal from the comparison means 22, and the tension of the film f is made constant, and the film end detection means 24 Outputs a signal for stopping the film feeding motor 2 by the output signal, and the inner cylinder by the output signal from the film end detection signal 24. In order to discharge the air of the inner it is constituted by a chucking drive means 25 for switching the electromagnetic switching valve 8.
Furthermore, the control device 20 includes a calculation means 26 for calculating the diameter of the film roll R based on the rotation speed of the film feeding motor 2, a calculation signal from the calculation means 26 and a warning value setting means 28. A warning value area detecting means 27 is provided for comparing the warning value signals and outputting a stop signal to the motor control means 23 via the restart relay 29 when the calculated value exceeds the warning value.
[0012]
Next, the operation of the apparatus configured as described above will be described.
Under normal film feeding conditions, the dancer roller 12 moves up and down according to the fluctuation of the tension acting on the film f, and the tension detected by the load cell 15 based on this movement is input to the comparison means 22 as a detection signal. Then, after comparing with the reference value signal from the reference value signal output means 21, the number of rotations of the film feeding motor 2 is controlled via the motor control means 23 by the difference signal, and the tension is kept almost constant. The film f is fed to a former (not shown).
[0013]
Further, in this control system, the diameter of the film roll R is calculated one by one by the roll diameter calculating means 26 based on the rotation speed of the film feeding motor 2, and when this value reaches a value preset in the warning value setting means 28. The film feeding motor 2 is stopped by a signal output from the warning value area detecting means 27 to the motor control means 23, but since the present applicant has already proposed these control operations in Japanese Patent Laid-Open No. 7-228400. Further explanation will be omitted.
[0014]
On the other hand, when the supply operation of the film f continues and all the film f wound around the paper tube D is exhausted, the pulling belt (not shown) has a tensile force on the film f whose end is fixed to the paper tube D. It acts via the dancer roller 12.
[0015]
Since this sudden tension fluctuation appears as a sudden rise in the dancer roller 13, the load cell 15, which grasps this movement as a large load fluctuation, outputs this abnormality detection signal to the comparison means 22 and outputs the film end detection means 24 and the motor control means 23. The film feeding motor 2 is immediately stopped through the electromagnetic switching valve 8 and the electromagnetic switching valve 8 is operated through the chucking drive means 25 to release the air in the inner cylinder 6 to the outside and to contract it. The protrusion 7 is detached from the inner surface of the paper tube D, and the film roll R is released.
[0016]
As a result, it is possible to prevent an excessive tension from acting on the film f in advance, and to prevent the occurrence of an accident such as an extension or breakage of the film f in the feeding process. The film is pulled out by hand, and the end of a new film f is joined to this end, and the next film f feeding operation is started.
[0017]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the inconvenience of making the entire film in the supply process unusable due to excessive tension acting at the end of feeding, and to draw the film to the end, The waste can be eliminated and a new film can be joined.
[0018]
In addition, since the displacement of the dancer roll is detected as a tension detecting means, excessive tension acting at the end of the film is temporarily absorbed by the displacement of the dancer roll, and damage caused by this tension acting directly on the film. Can be suppressed in advance.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an apparatus showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a chucking mechanism that holds a paper tube of a film roll.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll support shaft 2 Film feeding motor 5 Hollow outer cylinder 6 Inner cylinder 8 Electromagnetic switching valve 13 Dancer roller 20 Controller

Claims (3)

The film roll of the film end portion is wound is fixed to the paper tube, is rotated while hermetically contracture the paper tube by a support shaft, the film supply system of the type of feeding a film out by feeding the film Detection means for detecting abnormal tension acting on the film when the film runs out of the paper tube , and stopping of rotation of the support shaft and detention to the paper tube based on the abnormality detection output from the detection means An apparatus for terminating a film, comprising a control means for performing release . The support shaft, the paper tube sealed contracture from inside a number of projections infested from the outer cylinder, on the basis of the abnormality detection output from said detection means, retracting the projection driving against the paper tube 2. The film terminating device according to claim 1, wherein the film terminating device is configured to cut off force transmission . It said as detection means, termination processing apparatus of the film according to claim 1, characterized by using a detection means for detecting the displacement of Dansaro La which is disposed on the film feed path.

Images