JPH0597123A - Automatic film switching device for packaging machine - Google Patents

Abstract

PURPOSE:To automatically switch material roll film of a packaging machine, and improve the replenishing work of the material roll for the packaging machine, which has a pair of wound material rolls, and performs a continuous packaging by pulling out and transferring film from one of the material rolls. CONSTITUTION:A tension sensor roller 62 with which film F comes into contact is provided, and when the tension of the film F becomes zero, the final end of the film F and a starting end 65 of film F' are joined by a film connecting mechanism 59. Also, an ultrasonic sensor 64, which detects the thicknesses of the films F, F' of respective material rolls R, R', is provided at the leading end of a turning arm 63. By this method, when the remaining quantity of the film F becomes a specified quantity or lower, the turning arm 63 rotates, and the ultrasonic sensor 64 detects the remaining quantity of the film F' of the material roll R'. At this time, if the remaining quantity of the film F' is also at a specified quantity or lower, the transfer of the film F is immediately stopped to prevent both material rolls R, R' from becoming empty.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping machine for pulling out and transporting a film from an original film wound in a roll to continuously wrap the film.

[0002]

2. Description of the Related Art As a conventional device of this type, as shown in, for example, Japanese Utility Model Laid-Open No. 1-170601, a continuously transferred film is folded back and the folded back end edges of the film are overlapped and vertically sealed. It is known that the film to be packed is filled in the vertically sealed film and the film is horizontally sealed. An example of this is described with reference to FIG.
In the figure, reference numeral 1 is a machine base, and a pair of holding frames 2 and 2'is provided on the side of the machine frame, and original films R and 2 are formed by winding films F and F'on the holding frames 2 and 2 '. R ′ is detachably and replaceably held, and a film guide portion 3 and a film folding portion 4 are provided on the upper portion of the machine base 1, and a vertical seal portion 5, a first and a second portion are provided on the front surface portion of the machine base 1 from the upper side. Horizontal seal parts 6, 7, cutter part 8
Is provided, and the film F is pulled out from one of the original fabrics R and led out to the film folding section 4 through the film guiding section 3, and the film is guided by the folding guide 9 having a U-shaped tip provided at the film folding section 4. F is folded in two in the longitudinal direction, and the folded end portions of the film F are heat-sealed by a pair of vertical heat seal rolls 10 of the vertical seal portion 5 facing each other, and the film F is sent out.
The film F is formed into a tubular shape by the vertical seal F1, and the film F is laterally heat-sealed by the pair of horizontal heat seal rolls 11 facing each other in the first horizontal seal portion 6, and the bottom is formed by the horizontal seal F2. Then, the filling mechanism 12 fills the to-be-packaged object W such as food into the film F formed in the shape of a bottomed tube, and the film F is sent to the side of the second horizontal sheet portion 7 again. The object W to be packaged is sealed by the heat seal roll 11, the lateral seal F2 portion is then cut by the cutter unit 8, and the film is packaged by this, and is taken out and conveyed by a conveyor (not shown) or the like.

However, in the packaging apparatus having the above-described structure, every time the film F of one original fabric R is completely withdrawn and the film F'is drawn out from the other original fabric R ', the film F'is drawn out. It has to be repeated that the work of pulling the film into the conveying path such as the film guiding section 3 and the film folding section 4 is repeated. In order to eliminate such complexity during the replenishment work of the original fabrics R and R ', as proposed in Japanese Utility Model Publication No. 58-20491 and Japanese Utility Model Publication No. 53-51885, films F and F'are used. A film end detecting device for detecting the end, and a welding device for welding the film F end of the original fabric R in use and the film F'starting end of the spare original fabric R'are provided. Each time it is detected, the welding device is operated by the detection signal from the film end detection device, so that the original sheets R, R '
There is known a packaging device capable of efficiently performing the replenishment work of

[0004]

In the above-mentioned conventional packaging apparatus, for example, when an operator neglects to replace the original fabrics R and R ', the empty original fabrics R and R'are retained in the holding frame 2, When the film F, F'is packaged to the end of the film F while being attached to the film 2 ', the operation is stopped once and the film F, F'is stopped.
One of these must be routed again to the transfer path in the device. For this reason, during operation of the apparatus, the film F,
The remaining amount of F ′ had to be visually confirmed, and it was impossible to completely automate the replenishment work of the originals R and R ′.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to provide an automatic film switching device capable of completely automating the replenishment work of a raw material in any case.

[0006]

SUMMARY OF THE INVENTION According to the present invention, an original film wound with a film is detachably held on a pair of holding frames,
In a packaging machine for pulling out and transferring the film from one of the original fabrics for continuous packaging, a film end detecting means for detecting an end of the one film and a film for the one original film by the film end detecting means. A film connecting means for joining the end and the film starting end of the other original is provided, and the remaining film amount of both originals is detected, and when the remaining amount of the film becomes less than a predetermined amount for both originals. It is provided with a film remaining amount detecting means for forcibly stopping the transfer of the one film.

[0007]

According to the above construction, when the film end of one original is detected by the film end detecting means, the film connecting means connects the film end of the one original and the film starting end of the other original, The automatic continuous replenishment of the film is carried out by the alternating material. In addition, when the remaining amount of film on both originals falls below a certain amount, such as when the empty original remains attached to the holding frame, the film drawn from one of the originals by the film remaining amount detection means. Will immediately stop.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Incidentally, the same parts as those in FIG. 1 to 12, a pair of upper and lower holding frames 2 are provided on the side of the machine base 1 of the packaging device.
2'is provided, and the film rolls R and R'on which the films F and F'are respectively wound are detachably attached to the holding frames 2 and 2 '. A film slack preventing mechanism 14 is provided on the machine base 1, and the film slack preventing mechanism 14 is provided.
A guide roll 15 for guiding the film F that has passed through is provided at the upper part of the folding section 4, and the folding guide 9 is provided in the folding section 4.
An adjusting mechanism 16 for moving the is provided. The adjusting mechanism 16 is provided with a nut body 17 on the upper part of the machine base 1 so as to be able to move forward and backward in a rotation stop state in a direction transverse to the transport direction of the film F, and a screw shaft 18 is screwed onto the nut body 17. Then, a motor 19 for rotating the screw shaft 18 in the forward and reverse directions is attached to the upper part of the machine base 1, and the folding guides 9 each having a U-shaped tip at the tip are attached to the nut body 17 and located on both sides of the folding guides 9. And a folding guide 9 provided with a bar-shaped transfer guide 20
Further, a guide rod 21 extending to an upper position of the lateral seal portion 6 is suspended. A nozzle 22 extending to an upper position of the horizontal seal portion 6 is provided adjacent to the guide rod 21, and the nozzle 22 fills the film F with an object W to be packed such as a liquid or a viscous substance by a filling device (not shown). .. A pair of vertical heat-sealing rolls 1 of the vertical sealing portion 5 sandwiching the guide rod 21 and the nozzle 22.
0, 10 are installed, the bearing stand 23 is attached to the front of the machine base 1,
Gears 24, 24, which rotatably support the two vertical heat seal rolls 10 between the bearing stands 23 and mesh with one of the vertical heat seal rolls 10 and the other vertical heat seal roll 10, respectively. The gear 25 is fixed, the driven gear 25 is integrally provided on one gear 24, and the drive gear 27 driven by the drive device 26 provided in the machine base 1 is meshed with the driven gear 25, so that both vertical heat seal rolls 10, 10 The seal member 10A is formed on one side, and the outer peripheral surface of the seal member 10A is knurled.
And a temperature sensor S are built in, and the temperature sensor S uses a platinum resistor or the like whose resistance value changes with temperature. Further, the first horizontal seal portion 6 arranged below the vertical seal portion 5 and the second horizontal seal portion 7 arranged below the first horizontal seal portion 6 are respectively bearings. Both lateral heat seal rolls 11, 11 are rotatably supported between the bases 28, and gears 29 meshing with the one lateral heat seal roll 11 and the other lateral heat seal roll 11 are fixed, and one of the lateral heat seal rolls 11 is fixed. A driven gear 30 is integrally provided on the gear 29, a drive gear 31 driven by a drive device 26 is meshed with the driven gear 30, and seal members 11A are attached to the outer circumferences of both lateral heat seal rolls 11 at equal angular intervals. A heater H for heating the seal member 11A and a temperature sensor S are built in the inside, and as the temperature sensor S, a platinum resistor whose resistance value changes with temperature is used. Also, one of the first and second lateral heat seal rolls.
The gear 33 of the rotary encoder 32 meshes with the gear 29 of 11 to detect the rotation of the lateral heat seal roll 11,
This rotation is sent to a control unit (not shown) as an electric signal. Further, in this example, the drive device 26 is configured so that the drive gears 27 and 31 are rotationally driven by a cam mechanism or the like (not shown) so as to rotate at a periodic circular speed.

Reference numeral 34 is a film pressing mechanism provided between the vertical seal portion 5 and the first horizontal seal portion 6, and the pressing mechanism 34 is a shaft portion 36 that makes a pair obliquely downward from the mount 35.
The shaft portion 36 forming this pair is provided so as to sandwich the vertical seal F1 side of the film F, and the roller 37 is rotatably provided at the tip end side of the shaft portion 36 to form these pairs. Laura 3
The film F is transported with the vertical sheet F1 side of the film F being sandwiched between 7 and 37. Further, in this example, a pair of rollers 37, 37 are provided one above the other and a pair of small rollers 37A smaller than the rollers 37 are rotatably provided on the shaft 36A below the rollers 37. The film F is transferred with the vertical seal F1 portion of the film F held between the small rollers 37A, 37A.

The vertical heat seal roll 10 and the two horizontal heat seal rolls 11 and 11 have rotating shafts 10B and 11B,
One end side of 11B is formed hollow, and this rotating shaft 10
A rotary shaft 38A of a power supply rotary transformer 38 is connected to one ends of B, 11B and 11B via a connecting member 38B, and a temperature control rotary transformer 39 is provided at an end of the rotary shaft 38A. The rotary transformer for power supply 38 has an annular stator-side iron core 41 fitted to the inner peripheral wall of a fixed case 40, the winding 41A is wound around the stator-side iron core 41, and the stator iron core 41 has a predetermined shape. A rotary shaft side iron core 42 is formed on the rotary shaft 38A so as to face each other with a gap, and a winding 42A is wound around the rotary side iron core 42. The fixed case 40 is mounted on the machine base 1 via a bracket 43. And the bearing 44 is fixed to the fixed case 40.
A rotary shaft 38A is rotatably provided via
The heater H and the winding 42A of the iron core 42 on the rotating side are electrically connected by a power cord 45 inserted through the rotary shafts 10B and 11B of the heat seal roll 38A and 38A. The temperature control rotary transformer 39 has the same configuration as that of the power supply transformer 38. An annular stator side iron core 47 is fitted to the inner peripheral wall of a fixed case 46, and a winding 47A is attached to the stator side iron core 47. A rotary shaft side iron core 48 is formed on the rotary shaft 38A so as to face the stator iron core 47 at a predetermined interval, and a winding 48A is wound around the rotary side iron core 48. Fixed case
Reference numeral 46 is fixed to the fixed case 40 of the rotary transformer 38 for power supply, and the rotary shaft 38A and the rotary shaft of each heat seal roll.
The temperature sensor S and the winding 48A of the rotating-side iron core 48 are electrically connected by a lead wire 50 inserted through the insides of 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 to adjust the temperature of the heater H, and the temperature control transformer.
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 the CA thermocouple output to the temperature controller 52, and the output signal causes the temperature controller 52 to adjust the temperature of the heater H.
Further, the converter 53 supplies a carrier wave to the winding 47A on the stator side and has a detection bridge circuit (not shown) that detects a voltage change of the winding 47A.

When a predetermined voltage is applied to the winding 41A on the stator side of the power source transformer 38 from the AC power source 51, a voltage is induced in the winding 42A on the opposing rotor side, and this winding 42A The heater H connected to heats up to a predetermined temperature,
Further, the detection signal from the temperature sensor S is output via the temperature control rotary transformer 39, that is, the carrier wave is supplied from the converter 53 to the stator side winding 47A of the temperature control rotary transformer 39 in advance. 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. The temperature controller 52 is output based on this output signal.
Controls the voltage to keep the temperature of the heater H constant.

A pair of rollers 54, 54 'for changing the traveling direction of the films F, F'upward are provided inside the holding frames 2, 2'on the side of the machine base 1. This roller 54,
A pair of large and small guide rollers 55, 55 'are fixed above 54', and the films F, F are provided between the guide rollers 55, 55 '.
By holding ‘′, the films F, F’ in a state where all the films F, F ′ are unwound from the originals R, R ′
It is possible to prevent kinking of F '. Further, reference numeral 56 is a binding member fixed across the guide rollers 55, 55 ', and restricts the lateral movement of the films F, F'during conveyance. A film connecting mechanism 59 having a fixed suction plate 57 and a movable suction plate 58 that is movable in the horizontal direction facing the fixed suction plate 57 is disposed above the guide rollers 55 and 55 '. A plurality of suction holes connected to an air suction mechanism (not shown) are provided on the surfaces of the plate 57 and the movable suction plate 58.
60 are provided. Further, above the film connecting mechanism 59, a roller 61 and a tension sensor roller 62 as a film end detecting means are arranged in order from the bottom. The tension sensor roller 62 detects the pressure applied by the film F, that is, the tension of the film F. When the film F separates from the original fabric R and the tension of the film F becomes zero,
This film F end detection signal is sent to the film connection mechanism.
It is output to 59. On the other hand, reference numeral 63 is a rotating arm provided rotatably on the outside substantially in the center of the holding frames 2 and 2 ', and an ultrasonic sensor 64 as a film remaining amount detecting means is provided at the tip of the rotating arm 63. To be done. This ultrasonic sensor 64
Is to always measure the remaining amount of the film from the thickness of the films F and F'wound on one of the original fabrics R and R '.

Then, the original fabric R is mounted on the upper holding frame 2, the film F drawn from this original fabric R is brought into contact with the roller 54 and the guide roller 55, and further, the fixed suction plate 57 and After passing between the movable suction plate 58 and the movable suction plate 58, the roller 61 and the tension sensor roller 62 are brought into contact with each other and led out to the film guide portion 3. Similarly, a spare original fabric R'is also attached to the lower holding frame 2 ', and the film F'from this original fabric R'is brought into contact with the roller 54' and the guide roller 55 ', The start end 65 is moved by sucking air from the suction hole 60.
Adhesive 66 such as double-sided tape or glue is applied to the surface of the starting end portion 65 of this film F ', and
The ultrasonic sensor 64 is held in advance in the direction of the upper original sheet R. In this way, the folded end portions of the film F are heat sealed by the pair of vertical heat seals 10 and are sent out.
A film F formed in a tubular shape by the vertical seal F1
Is laterally heat-sealed by a pair of horizontal heat-sealing rolls 11 of the horizontal seal portion 6 facing each other, thereby filling the film W formed in a cylindrical shape with a bottom with the object W to be packaged from the nozzle 22. The film F is sent, and the second lateral seal portion is cut again by the cutter portion 8, whereby the object W to be packaged is film-wrapped. In this case, the film F before the horizontal seal filled with the object to be packaged W is pressed by the roller 37 of the pressing mechanism 34 on the side of the vertical seal F1 and sent to the first horizontal seal portion 6 in a substantially flat state. Horizontal seal part 6
The horizontal heat-sealing roll 11 provides stable horizontal sealing.

After that, the film is packaged according to the above-mentioned predetermined procedure, and as shown in FIG. 3, the remaining amount of the film F wound on one of the original fabrics R by the ultrasonic sensor 64 is a predetermined amount. For example, when it is detected that the thickness reaches 1 mm, the rotating arm 63 rotates, and the ultrasonic sensor 64 immediately detects the remaining amount of the film F'on the other original fabric R '. At this time, if there is a predetermined amount or more of the film F ′ in the original fabric R ′, the ultrasonic sensor 64 determines that the backup original fabric R ′ is loaded in the holding frame 2 ′. When the transfer is continued and the remaining amount of the film F'is less than the predetermined value, the ultrasonic sensor 64 determines that both the originals R and R'are empty and forces the film F '. Stop the transfer of. Next, as shown in FIG. 4, when the film F ′ having a predetermined amount or more is wound around the original fabric R ′ and the film F separates from the original fabric R, the tension sensor roller 62 causes the tension of the film F to increase. Becomes zero and the end portion 67 of the film F is judged to have appeared, and the end detection signal is sent to the film connection mechanism.
Output to 59. At this time, as shown in FIG. 5, in the film connecting mechanism 59, when the terminal end portion 67 of the film F passes the film connecting mechanism 59 after a predetermined time elapses, a fixed suction plate 57 and a moving suction plate are moved by a timer (not shown). Board
Put it in close contact with 58. As a result, the end portion of the film F
67 and the starting end portion 65 of the film F'are joined by an adhesive 66, and the film F'from the original fabric R'is used as shown in FIG. In order to prevent the occurrence of defects during the joining of the films F and F ′, the cutting of the film F ′ by the cutter unit 8 is temporarily stopped and a new one is newly provided until the joining of the films F and F ′ is completed. Until the flow of the delivered film F ′ is stabilized, the filling mechanism 12 stops filling the film F ′ with the object W to be packaged.
Thus, the ultrasonic sensor 64 and the tension sensor roller
By detecting the remaining amount of the films F and F'of both the original fabrics R and R'and the end detection of the films F and F'in use by 62, the films F and F'from the original fabrics R and R'are repeated.
The continuous transfer of ´ is performed automatically.

As described above, in this embodiment, the original fabrics R and R'in which the films F and F'are respectively wound around the pair of holding frames 2 and 2'are detachably retained, and either one of the original fabrics is retained. In a packaging machine for pulling out and transporting the film F from the opposite R to continuously wrap it, a tension sensor roller 62 as a film end detecting means for detecting the end portion 67 of the one film F, and the tension sensor roller 62 The end portion 67 of the film F of the original fabric R and the other original fabric R ′
And a film connecting mechanism 59 as a film connecting means for joining the starting end portion 65 of the film F'of the film F ', and detecting the remaining amount of the films F, F'of both the original fabrics R, R'. An ultrasonic sensor 64 is provided as a film remaining amount detecting means for forcibly stopping the transfer of the one film F when the remaining amount of F'is less than a predetermined amount for both the original sheets R and R '. From the film F currently in use
By joining the terminal end portion 67 of the sheet and the starting end portion 65 of the spare film F ′, not only the pair of original fabrics R and R ′ can perform continuous packaging work but also, for example, the operation of the apparatus. If the operator neglects to replace the original fabrics R and R ′, and the empty original fabrics R and R ′ remain attached to the holding frames 2 and 2 ′, the ultrasonic sensor is used. Since the transport of the film F is temporarily stopped while the film F is left on the original fabric R by 64, the original fabrics R and R'can be continuously installed only by mounting the spare original fabric R'on the holding frame 2 '. It is possible to carry out the packaging work by the above, and it is possible to favorably carry out the replenishment work of the original fabrics R and R'without having to draw the film F'into the transfer path during the work.

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, in the above example, the automatic filling and packaging machine for liquids and the like has been described as an example, but it can be applied to a packaging machine using a stretch film, a packaging machine such as a horizontal pillow type packaging machine, and a film. Although a non-contact type ultrasonic sensor was used as the remaining amount detecting means, the thickness of the film can be directly detected by contacting the film with a microswitch or a spring member, or the film thickness can be optically detected by a photoelectric tube or a photo sensor. May be detected, or the ultrasonic sensors may be individually arranged toward each original fabric without connecting a switching mechanism such as a rotating arm. Furthermore, the end of one film and the start of the other film can be joined by heat welding, and the film end detecting means is not limited to the tension sensor, and various other sensors are used. be able to.

[0017]

Industrial Applicability The present invention is a packaging machine for removably holding a roll of film wound on a pair of holding frames, pulling out and transporting the film from one of the rolls for continuous packaging, A film end detecting means for detecting the end of the one film, and a film connecting means for joining the film end of the one original film and the film starting end of the other original film by the film end detecting means, It is provided with a film remaining amount detecting means for detecting the film remaining amount of both the originals and forcibly stopping the transfer of the one film when the remaining amount of the films is less than a predetermined amount. Therefore, it is possible to provide an automatic film switching device for a packaging machine which can favorably perform the replenishment work of the original fabric.

[Brief description of drawings]

FIG. 1 is a front view of a packaging device showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 3 is a front view of a main part when the remaining amount of the film of the original fabric is equal to or less than a predetermined value, showing an embodiment of the present invention.

FIG. 4 is a front view of the main part when the film is separated from the original fabric showing the embodiment of the present invention.

FIG. 5 is a front view of a main part at the time of film bonding showing an embodiment of the present invention.

FIG. 6 is a front view of a main part after film bonding, showing an embodiment of the present invention.

FIG. 7 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 8 is a plan sectional view showing an embodiment of the present invention.

FIG. 9 is a schematic explanatory diagram of a main part showing an embodiment of the present invention.

FIG. 10 is a perspective view of a guide member showing an embodiment of the present invention.

FIG. 11 is a cross-sectional explanatory view of a main part showing an embodiment of the present invention.

FIG. 12 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 13 is a front view of a packaging device showing a conventional example.

[Explanation of symbols]

 2, 2'holding frame 59 film connecting mechanism (film connecting means) 62 tension sensor roller (film end detecting means) 64 ultrasonic sensor (film remaining amount detecting means) F, F'film R, R'original

Claims (1)

[Claims] 1. A packaging machine for removably holding a roll of film wound on a pair of holding frames, pulling out and transporting the film from one of the rolls for continuous wrapping, A film end detecting means for detecting the end of the film, and a film connecting means for joining the film end of the one original film and the film starting end of the other original film by the film end detecting means are provided. A film remaining amount detecting means for detecting the remaining amount of the film of the original film and forcibly stopping the transfer of the one film when the remaining amount of the film of both of the original films is less than a predetermined amount. Automatic film changer for packaging machines.