JP3599164B2 - Temperature control device for heating sealer - Google Patents

Description

[0001]
[Problems of the prior art]
Along the length of the band-shaped plastic film is rolled up and covered from the packages to be conveyed at equal intervals in a column, and both sides of the film are center-sealed with a pair of heat rollers to form the film into a cylinder. The cross-sealing of the cylindrical film so as to cross in the traveling direction of the article to be packaged, and placing the article in a bag making and filling machine that seals the article to be packaged in a bag, conventionally controls the temperature of both sealers by the following. It is based on the configuration.
[0002]
That is, the first is a configuration in which a sensor is installed directly inside the sealer to measure the sealer temperature, and the second is a configuration in which the sensor is brought into contact with the rotating sealer surface to measure the contact temperature.
[0003]
However, despite the temperature difference between the inside of the sealer and the surface of the sealer that applies heat to the film, the first is that the temperature is measured only inside the sealer, so the temperature control is inaccurate. Although second measurement is was devised, to the contact friction heat is generated between the rotary sealer and the sensor, also a problem of measurement by a plastic coating which adhesion to the sealer surface becomes inaccurate Was.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to perform accurate temperature control by detecting the temperature of a film contact surface of a sealer without error without directly contacting the sensor with the sealer.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, by pulling a band-shaped plastic film 10 through a formal 11 having a cylindrical section, the film is rolled into a cylindrical shape 12. In this case, the two rolls 13 on the front side transport the film 10 by its rotational power, and the two seal rollers 14 on the rear side heat and compress the both sides of the cylindrical film to fuse them together. On the other hand, by supplying a large number of packages 15 at equal intervals from the inlet of the former 11, these packages are arranged at equal intervals in the cylindrical film 12, and the rear cross sealer 16 The cylindrical film 12 is sealed in a space between the two.
[0006]
A non-contact type thermometer 22 provided on a machine base 20 via a bracket 21 is installed facing the peripheral surface of the seal roller 14. Error of the laser beam light reflected from the circumferential surface of and is irradiated the sealing roller 14 from the thermometer, is input as a detected temperature value to the controller 24 through the circuit 23, the controller 24 and the set temperature value is calculated, whereas the controller 25 the temperature of the sealing roller inside the heater 19 to transmit a control signal to the transformer 26 so as to keep the set value.
[0007]
In the case of a pair of upper and lower cross sealers 16 shown in FIG. 2, a switch 30 is provided in a circuit 23 connecting a non-contact type thermometer 22 and a controller 24. Cam 33 provided on the shaft 32 of the rotary shaft or the motor 31 for driving the Shikuroshira 16, the timing means 34 to intermittently operate, the so closes the opener 30 in accordance with the timing of the cross sealer 16, the thermometer 22 is Sheila The controller 25 transmits the detected temperature to the controller 24 only when facing the peripheral surface of the heater 16, and the controller 25 and the transformer 26 control the temperature of the heater 35.
[0008]
Even in the case of a sealing device having a structure in which a pair of cross sealers 16 circulate along an elliptical orbit 40 as shown in FIG. 3, since the non-contact type thermometer 22 cannot always detect the temperature of the sealer 16 , the rotation angle detecting means of the sealer A signal is transmitted to the controller 24 via the circuit 23 only when the sealer 16 and the thermometer 22 face each other by the switch 30 operated by the controller 30. Note that, in FIG. 3, the components denoted by the same reference numerals as those in FIGS. 1 and 2 perform the same operations as the components denoted by the same reference numerals in these drawings.
[Brief description of the drawings]
FIG. 1 is a rear view as viewed from above from the bottom. FIG. 2 is a II-II arrow diagram in FIG. 1. FIG. 3 is an explanatory diagram of another embodiment.
DESCRIPTION OF SYMBOLS 10 ... Strip film 11 ... Former 14 ... Center sealer 16 ... Cross sealer 22 ... Non-contact type thermometer 23 ... Circuit 24 ... Controller 25 ... Controller 26 ... Transformer 30 ... Switch 31 ... Motor 33 ... Rotation angle detector 34 … Timing means

Claims (1)

After the belt-shaped plastic film is rolled up vertically over the articles to be transferred which are transported at equal intervals in a column, the film is formed into a tubular shape by center-sealing both side edges of the film with a pair of heat rollers, In a bag making and filling machine for sealing a packaged object in a bag by welding with a pair of cross sealers rotating (circulating) the cylindrical film so as to cross in the traveling direction of the packaged object, the laser reflected from the circumferential surface of the non-contact type emitted from a thermometer and the cross sealer contraposed to the rotation track, in synchronization with the cross sealer spin cycle by the timing means for actuating the rotation axis of the cross sealer open switch arranged through the circuit input as a detected temperature to the controller calculates the error between the detected temperature value and the set temperature value in said controller said to Temperature controller heater temperature of Rosushira surface is controlled by the transformer so as to keep the set value.

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