JPH0639712U - Seal packing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Correct the energization time of the heating element to always set the optimum seal temperature, and forcibly correct the energization time for the material, thickness, and shape of the sealing material. By determining the optimum energization time, obtain the optimum seal temperature. A heating element 1, a detector 3 for detecting the temperature of the heating element 1 at the start of sealing, a microprocessor 2 for taking in a signal from the detector 3 and calculating an energization time to the heating element 1, A variable resistor 7 for setting a sealing time by forcibly correcting the energization time, and a signal from the variable resistor 7 are fetched into the microprocessor 2 and the heat generation amount of the heating element 1 is controlled via a triac 8. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal packaging machine for sealing the mouth of a sealing material containing a package by heat welding.

[0002]

[Prior art]

 As shown in FIG. 3, the conventional seal packaging machine has a heating element 22 connected to a power source via a transformer 21. This seal wrapping machine accommodates an object to be packaged in a sealing material (sealing bag) by the heating element 22, presses the mouth of the sealing material against the sealing heating element, and seals by heat welding. The heating element 22 is energized by pressing a micro switch 23 provided on the power supply line. Further, the power supply line is provided with a thermostat 24 which detects an overheated temperature of the heating element 22 and turns the power supply on and off. The heating element 22 sets the energization time of the heating element 22 by the timer circuit 26. The timer circuit 26 has a timer 27, a relay 28, and a relay contact 29.

With the above configuration, in the seal packaging machine, the heating element is constantly energized by the timer 27 for a certain period of time to seal the sealing material.

[0004]

[Problems to be solved by the device]

 However, in the seal packaging machine, even if there is a difference in the initial surface temperature of the heating element 22 (for example, a change in room temperature), energization is always performed for a certain period of time, so the amount of heat generated per sealing time varies. However, there is a problem that good sealing may not be possible.

Further, recently, in the seal packaging industry, the material of the seal bag and the shape of the seal bag are diversified, and the time management for sealing and the temperature immediately before the sealing are used as a standard. Temperature control is becoming important.

Therefore, the problem of the present invention is to determine the energization time of the heating element and always set it to the optimum seal temperature, and to force the energization time for the material, thickness and shape of the sealing material. The objective is to provide a seal packaging machine that determines the optimum energization time by optimally correcting it and obtains the optimum sealing temperature.

[0007]

[Means for Solving the Problems]

 According to the present invention, a heating element, a detector for detecting the temperature at the start of sealing of the heating element, a signal of the detector is fetched, the energization time to the heating element is calculated, and the energization time of the heating element is calculated. And a variable resistor for compensating the energization time to the heating element by forcibly correcting the energization time, and taking in the signal of the variable resistor to the microprocessor. A seal wrapping machine capable of correcting the energization time of the heating element can be obtained.

[0008]

[Action]

 According to the seal packaging machine of the present invention, even if there is a difference in the surface temperature of the heating element at the start of sealing, it is ideal for detecting the temperature at the start of sealing of the heating element and sealing at the temperature of the energized heating element. Optimum sealing temperature can be obtained by finding the appropriate sealing time.

Further, for the material, thickness and shape of the sealing material, the energization time is forcibly corrected to determine the optimum energization time and obtain the optimum sealing time.

[0010]

【Example】

 1 and 2 show an embodiment of the present invention. Referring to FIG. 1, the seal wrapping machine comprises a heating element 1, a microprocessor 2 for automatically controlling the energization time of the heating element 1, a thermistor (detector) 3 for detecting an initial temperature of the heating element 1, amplifiers 4, 5 , A transformer 6, a variable resistor 7 for forcibly correcting the sealing time, a triac 8, a transistor array 9, a phototransistor coupler 10, and the like.

The signal of the thermistor 3 is input to the microprocessor 2 to calculate the energization time of the heating element 1 to obtain the optimum sealing time. At the same time, for the material, thickness, and shape of the sealing material, the optimum energizing time is determined by VR operation to obtain the optimum sealing time.

That is, the surface temperature of the heating element at the start of sealing is converted from the analog signal from the thermistor 3 into a digital signal by the microprocessor 2, and the energization time of the heating element 1 is automatically determined. In addition, it is possible to change the energization time according to the material and thickness of the sealing material by manual operation. As shown in FIG. 2, the thermist 3 includes a base 11, an insulating sheet member 12, a strip-shaped heating element 1 and a thin tape 13 for protecting the heating element 1 on one surface of the base 11. ing. An insertion hole 14 is formed in the sheet member 12 and the base 11. A thermistor 3 is provided in the insertion hole 14 close to the heating element 1. The thermistor 3 is fixed by a protective packing 15 inserted in the insertion hole 14. A lead wire 16 is connected to the thermistor 3.

[0013]

[Effect of device]

 As described above with reference to the embodiments, according to the seal packaging machine of the present invention, the sealing time is determined based on the temperature of the heating element immediately before the sealing of the heating element. The optimum sealing time can be obtained, and the energization time of the heating element is also corrected by the temperature of the thermistor, so it is possible to set the optimum seal temperature at all times, resulting in operability. It is possible to obtain a seal packaging machine with good and high performance.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a seal packaging machine of the present invention.

FIG. 2 is a cross-sectional view showing a heat sensitive part of FIG.

FIG. 3 is a circuit diagram showing a conventional seal packaging machine.

[Explanation of symbols]

 1, 22 Heating element 2 Microprocessor 3 Thermistor 4, 5 Amplifier 6, 21 Transformer 7 Variable resistor 8 Triac 9 Transistor array 11 Base 12 Sheet member 23 Micro switch 24 Thermostat 26 Timer circuit

Claims (1)

[Scope of utility model registration request] 1. A heating element, a detector for detecting the temperature of the heating element at the start of sealing, a signal from the detector is taken in, and the energization time to the heating element is calculated to determine the energization time of the heating element. And a variable resistor for compensating the energization time to the heating element by forcibly compensating the energization time, and the signal of the variable resistor is taken into the microprocessor, A sticker wrapping machine that can correct the energization time of the heating element.