JP2626317B2 - Heat sealing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sealing device used for a film packaging machine or the like.

[0002]

2. Description of the Related Art As a conventional apparatus of this type, for example, as shown in Japanese Utility Model Laid-Open Publication No. 1-160601, a film which is continuously transported is folded, and both folded edges of the film are overlapped and vertically sealed. It is known that the vertically sealed film is filled with an object to be packaged and the film is horizontally sealed. One example of this will be described with reference to FIG. The holding frame 2 is provided with a film rewinding roll R around which a film F is wound, and is detachably provided. The film guide section 3 and the film folding section 4 are arranged on the upper portion of the machine base 1. And machine 1
A vertical seal portion 5, first and second horizontal seal portions 6 and 7, and a cutter portion 8 are provided from the upper side on the front surface of the film. The film F is led out to the film folding section 4, and the film F is folded in the longitudinal direction by a folding guide 9 having a U-shaped end provided at the film folding section 4. At 10, the folded ends of the film F are heat-sealed and sent out. The film F is formed into a cylindrical shape by the vertical seal F <b> 1, and the film F is formed by a pair of opposing horizontal heat seal rolls 11 of the first horizontal seal portion 6. Is heat-sealed in the horizontal direction, a bottom portion is formed by the horizontal seal F2, and thereby, the film F formed into a bottomed cylindrical shape is filled with a packaged object W such as a food product by the filling mechanism 12; Film F The transverse heat sealing roll 11 again sent by the second lateral sheet portion 7 sealed the package item W, then the lateral seal F2 portion was cut with a cutter unit 8,
In this way, the film is packaged, and is taken out and conveyed by a conveyor or the like (not shown). Each of the heat seal rolls 10, 11, and 11 includes a heater and a temperature sensor for controlling the temperature of the heater therein, and these heaters and the temperature sensor are connected to each of the heat seal rolls 10, 11, and 11. Are electrically connected to a slip ring 13 provided at an end of the shaft, and electricity is supplied to the heater by a brush (not shown) in contact with the slip ring 13, and a detection signal from the temperature sensor is supplied to the outside. It is configured to output.

[0003]

In the above-described conventional electric connection structure of the heater and the temperature sensor, the slip ring 13 is used.
Since the mechanical contact between the brush and the brush is used, problems such as poor contact and reduced durability due to wear are inevitable, and it is necessary to periodically clean the slip ring 13 and replace and adjust the worn brush. Has to be stopped, the operating efficiency of the apparatus is reduced, and the productivity is poor. Further, the mechanical contact may cause contact resistance, noise, chattering, and the like,
In particular, it is necessary to provide a noise filter in the circuit of the temperature sensor due to the generation of the noise, or a signal transmission failure from the temperature sensor occurs due to the chattering, so that there is a possibility that stable temperature control of the heater cannot be performed. .

Accordingly, an object of the present invention is to provide a heat sealing apparatus capable of controlling the temperature of a heat seal roll stably and having excellent durability and reliability.

[0005]

According to the present invention, a film which is continuously transported is fed to a film folding section, the film is folded by a folding guide of the film folding section, and both ends of the film are overlapped with a vertical heat seal roll. In a heat sealing device that vertically seals and fills the vertically sealed film with an object to be packaged, horizontally seals the vertically sealed film by a horizontal heat seal roll, and continuously packs, the inside of each heat seal roll is A heater and a temperature sensor, a power supply rotary transformer and a temperature control rotary transformer connected to a rotating shaft of the heat seal roll, and the heater connected to an external power supply via the power rotary transformer; It is configured to output a detection signal from a sensor to the outside via the temperature control rotary transformer.

[0006]

According to the above construction, power can be supplied to the heater in the rotating heat seal roll from outside without using mechanical contact without using mechanical contact, and the detection signal from the temperature sensor in the rotating heat seal roll is contactless. It can be output to the outside in the state.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. 1 to 7 show an embodiment of the present invention. A holding frame 2 is provided on a side of a machine base 1 of a heat sealing apparatus. Are provided so as to be detachable and replaceable. A film slack prevention mechanism 14 is provided on the upper part of the machine base 1,
A guide roll 15 for guiding the film F having passed through the film slack preventing mechanism 14 is provided on the upper part of the folded part 4, and the folded part 4 is provided with an adjusting mechanism 16 for moving the folded guide 9. The adjusting mechanism 16 is provided on the upper part of the machine base 1 such that the nut body 17 can move forward and backward in a direction crossing the transport direction of the film F in a detented state.
A screw shaft 18 is screwed onto the base 17, a motor 19 for rotating the screw shaft 18 forward and reverse is attached to the upper part of the machine base 1, a folding guide 9 having a U-shaped tip at the tip is attached to the nut body 17, and a folding guide is attached. A bar-shaped transfer guide 20 is provided on both sides of the horizontal guide 9, and a guide rod 21 extending to an upper position of the horizontal seal portion 6 is hung down from the return guide 9. A nozzle 22 is provided alongside the guide rod 21 and extends to an upper position of the horizontal seal portion 6. The nozzle 22 fills the film F with a packing object W such as a liquid or a viscous substance by a filling device (not shown). .
A pair of vertical heat seal rolls 10 and 10 of the vertical seal portion 5 are disposed with the guide rod 21 and the nozzle 22 interposed therebetween, and a bearing stand 23 is attached to the front of the machine base 1. Gears 24, 24 that rotatably support the vertical heat seal rolls 10, 10 and mesh with one of the vertical heat seal rolls 10 and the other vertical heat seal roll 10, respectively, are fixed to one of the gears 24. The driven gear 25 is provided integrally, and the driven gear 25
Gear driven by a driving device 26 provided in the machine base 1
27, a sealing member 10A is formed on one side of both vertical heat seal rolls 10, and knurling is performed on the outer peripheral surface of the sheet member 10A. Built-in temperature sensor S,
As the temperature sensor S, a platinum resistor or the like whose resistance value changes with temperature is used. Further, a first horizontal seal portion 6 disposed below the vertical seal portion 5 and a second horizontal seal portion 7 disposed below the first horizontal seal portion 6 are each provided with a bearing. The two horizontal heat seal rolls 11 are rotatably supported between the tables 28 and one of the horizontal heat seal rolls 11 is supported.
A gear 29 meshing with the other heat seal roll 11 is fixed, and a driven gear 30 is integrally provided on one gear 29, and a driven gear 31 driven by a driving device 26 is meshed with the driven gear 30. A seal member 11A is attached to the outer periphery of the two horizontal heat seal rolls 11 at equal angular intervals, and a heater H for heating the seal member 11A and a temperature sensor S are built therein. The temperature sensor S has a resistance value depending on the temperature. Is used. A gear 33 of a rotary encoder 32 meshes with a gear 29 of one of the first and second horizontal heat seal rolls 11 to detect the rotation of the horizontal heat seal roll 11, and this rotation is used as an electric signal. To a control unit (not shown). Further, in this example, the driving device 26 is configured to rotationally drive the driving gears 27 and 31 by a cam mechanism or the like (not shown) so as to rotate at a periodic circular speed.

Reference numeral 34 denotes a film pressing mechanism provided between the vertical seal portion 5 and the first horizontal seal portion 6. The film pressing mechanism 34 includes a shaft portion 36 diagonally downward from the mounting base 35.
The pair of shaft portions 36 are provided so as to sandwich the longitudinal seal F1 side of the film F, and a roller 37 is rotatably provided at the leading end side of the shaft portion 36 to form these pairs. Roller 3
The film F is transported in a state where the vertical sheet F1 side of the film F is sandwiched between 7 and 37. Further, in this example, a pair of rollers 37, 37 are provided one by one at the top and bottom, and a pair of small rollers 37A smaller than the rollers 37 are rotatably provided at the lower portion by a shaft portion 36A. The film F is transported with the vertical seal F1 portion of the film F held between the small rollers 37A. Then, the folded ends of the film F are heat-sealed by a pair of vertical heat seal rolls 10 and fed out.
1. The film F formed into a cylindrical shape by
Is heat-sealed in a horizontal direction by a pair of opposing horizontal heat seal rolls 11 to thereby form a film F formed into a bottomed cylindrical shape.
Is filled with the article W through the nozzle 22, the film F is further fed, and the article W is sealed again by the horizontal heat seal roll 12 of the second horizontal sheet portion 7, and then the horizontal sealing portion is cut with a cutter. The cutting is performed at the section 8, whereby the film packaging of the article to be packaged W is performed. In this case, the film F filled with the article W before the horizontal seal is pressed by the roller 37 of the pressing mechanism 34 on the side of the vertical seal F1 and is sent to the first horizontal seal portion 6 in a substantially flat state, and thereafter the horizontal seal F1 is fed to the first horizontal seal portion 6. Stable horizontal sealing is performed by the horizontal heat sealing roll 11 of the sealing section 6.

The vertical heat seal roll 10 and the two horizontal heat seal rolls 11, 11 have respective rotating shafts 10B, 11B,
One end of 11B is formed in a hollow,
A rotation shaft 38A of a power supply rotary transformer 38 is connected to one end of each of B, 11B, 11B via a connecting member 37.
A temperature control rotary transformer 39 is provided at the end of 38A. The power supply rotary transformer 38 has an annular stator-side core 41 fitted on the inner peripheral wall of the fixed case 40, and the stator-side core
A winding 41A is wound around 41, and a rotating shaft side core is attached to the rotating shaft 38A so as to face the stator core 41 at a predetermined interval.
The fixed case 40 is fixed to the machine base 1 side via a bracket 43, and a bearing 44 is fixed to the fixed case 40. The rotation shaft 38A is provided rotatably through the rotation shaft 38A.
A and the power supply cord 45 inserted through the rotation shafts 10B and 11B of the heat seal rolls and the heater H and the rotation side iron core.
The 42 windings 42A are electrically connected. The temperature control rotary transformer 39 has the same configuration as the power supply transformer 38, and has an annular stator-side core 47 fitted to the inner peripheral wall of a fixed case 46, and a winding 47A is wound around the stator-side core 47. A rotating shaft-side core 48 is formed on the rotating shaft 38A so as to face the stator core 47 at a predetermined interval, and a winding 48A is wound around the rotating core 48. Fixed case
46 is fixed to a fixed case 40 of the power supply rotary transformer 38, and has a rotary shaft 38A and a rotary shaft of each heat seal roll.
The temperature sensor S and the winding 48A of the rotating iron core 48 are electrically connected by lead wires 50 inserted through 10B and 11B. The power supply rotary transformer 38 is connected to an AC power supply 51 and a temperature controller 52 that controls the voltage of the AC power supply 51 and adjusts the temperature of the heater H.
39 is connected to the temperature controller 52 via a converter 53,
The converter 53 converts the output from the temperature control transformer 39 into a CA thermocouple output and outputs it to the temperature controller 52. The temperature controller 52 adjusts the temperature of the heater H based on this output signal.
The converter 53 supplies a carrier to the stator-side winding 47A and has a detection bridge circuit (not shown) for detecting a voltage change of the winding 47A.

When a predetermined voltage is applied from the AC power supply 51 to the stator winding 41A of the power transformer 38, a voltage is induced in the opposing rotor winding 42A. Is heated to a predetermined temperature,
In addition, the detection signal from the temperature sensor S is output via the temperature control rotary transformer 39, that is, in a state where a carrier is previously supplied from the converter 53 to the stator-side winding 47A of the temperature control rotary transformer 39, the temperature is determined by the temperature. The change in the current flowing through the temperature sensor S whose resistance value changes is compared with the reference resistance of the detection bridge circuit of the converter 53 as a change in the voltage induced in the winding 47A on the stator side of the temperature control rotary transformer 39. Output, and the temperature controller 52
Controls the voltage to keep the temperature of the heater H constant.

As described above, in this embodiment, the film F which is continuously transported is sent to the film folding section 4, and the film F is folded by the folding guide 9 of the film folding section 4.
The folded edges of the film F are overlapped and vertically sealed by a vertical heat seal roll 10, and the vertically sealed film F
In the heat sealing apparatus, the inside of each of the heat sealing rolls 10 and 11 is provided with a heater H and a temperature. The power supply rotary transformer 38 and the temperature control rotary transformer 39 are connected to the rotary shafts 10B and 11B of the heat seal rolls 10 and 11, respectively. Since it is connected to an external power supply 51 and configured to output a detection signal of the temperature sensor S to the outside via the temperature control rotary transformer 39, the detection signal is supplied to the heater H in the rotating heat seal rolls 10 and 11. Power can be supplied in a non-contact state without using mechanical contact from the outside, and a detection signal from a temperature sensor S in the rotating heat seal rolls 10 and 11 is output to the outside in a non-contact state. This eliminates the need for maintenance due to wear and the like due to mechanical contact as in the prior art, and is excellent in productivity. In addition, a circuit for transmitting a signal from the temperature sensor S without generating electrical noise, chattering, etc. The configuration is simple, and highly accurate temperature detection can be performed. Further, as an effect of the embodiment, a detection signal from the temperature sensor S is output to the outside via the temperature control transformer 39, and the temperature controller 52 controls the temperature of the heater H based on the output signal. With this configuration, it is possible to control the temperature of the heater H with high accuracy, and to perform a stable sealing operation for the film F.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, each rotary transformer may be a vertical heat seal roll only or a horizontal heat seal roll. It may be configured to be connected only to the roll, and various types of temperature sensors, temperature control rotary transformers and power supply rotary transformers can be used.

[0013]

According to the present invention, the film which is continuously transported is fed to the film folding section, the film is folded by the folding guide of the film folding section, and the folded edges of the film are overlapped and vertically sealed by the vertical heat seal roll. In a heat sealing apparatus for filling an object to be packaged into the vertically sealed film and horizontally packing the vertically sealed film by horizontal sealing with a horizontal heat sealing roll, a heater and a temperature sensor are provided inside each of the heat sealing rolls. And a power supply rotary transformer and a temperature control rotary transformer are connected to a rotary shaft of the heat seal roll, and the heater is connected to an external power supply via the power rotary transformer, and detection from the temperature sensor is performed. A signal is output to the outside through the temperature control rotary transformer, and the safety of the heat seal roll is reduced. The heat-sealing apparatus in which the temperature control is an excellent possibility durability and reliability that can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan sectional view of a main part showing one embodiment of the present invention.

FIG. 3 is a front view of a heat sealing device showing one embodiment of the present invention.

FIG. 4 is a perspective view of a main part showing one embodiment of the present invention.

FIG. 5 is a schematic explanatory view of a main part showing one embodiment of the present invention.

FIG. 6 is an enlarged perspective view of a main part showing one embodiment of the present invention.

FIG. 7 is a schematic explanatory view showing one embodiment of the present invention.

FIG. 8 is a front view of a heat sealing device showing a conventional example.

[Explanation of symbols]

 4 Folding section 9 Folding guide 10 Vertical heat seal roll 10B Rotary shaft 11 Horizontal heat seal roll 11B Rotary shaft 38 Power supply rotary transformer 39 Temperature control rotary transformer 51 AC power supply H Heater S Temperature sensor F Film F1 Horizontal seal F2 Vertical seal

Claims (1)

(57) [Claims] 1. A film which is continuously transported is fed to a film folding section, the film is folded by a folding guide of the film folding section, and both folded edges of the film are overlapped and vertically sealed by a vertical heat seal roll. In the heat sealing device that fills the packaged object in the formed film, and horizontally seals the vertically sealed film with a horizontal heat seal roll and continuously packs the heat seal device, a heater and a temperature sensor are provided inside each of the heat seal rolls. A power supply rotary transformer and a temperature control rotary transformer are connected to a rotary shaft of the heat seal roll, the heater is connected to an external power supply via the power rotary transformer, and a detection signal from the temperature sensor is output. A heat sealing device characterized by being configured to output to the outside via a temperature control rotary transformer.