JP2808582B2 - Automatic film switching device for packaging machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic film switching device for a packaging machine for drawing and transferring a film from a raw material of a film wound in a roll and continuously packaging the film .

[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 is described with reference to FIG.
In FIG. 1, reference numeral 1 denotes a machine frame, on which a pair of holding frames 2 and 2 'are provided, and raw films R on which films F and F' are wound around the holding frames 2 and 2 '. R 'is detachably held, and a film guide portion 3 and a film folding portion 4 are arranged on the upper portion of the machine 1, and the vertical seal portion 5, the first and second seals are provided on the front portion of the machine 1 from above. Horizontal seal parts 6, 7, cutter part 8
The film F is pulled out from one of the material rolls R, led out to the film turn-back portion 4 via the film guide portion 3, and the film is turned by the turn-up guide 9 having the U-shaped surface at the end provided in the film turn-over portion 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 opposed vertical heat seal rolls 10 of the vertical seal portion 5 and sent out.
The film F is formed into a tubular shape by the vertical seal F1, and the film F is heat-sealed in a horizontal direction by a pair of horizontal heat seal rolls 11 facing the first horizontal seal portion 6, and a bottom is formed by the horizontal seal F2. The filling mechanism 12 fills the film F formed into a bottomed cylindrical shape with a packaged object W such as a food product, and the film F is fed again to the side of the second horizontal sheet portion 7. The object W to be packaged is sealed by the heat seal roll 11, and then the horizontal seal F2 is cut by the cutter unit 8, whereby the film is packaged, and is taken out and conveyed by a not-shown conveyor or the like.

However, in the packaging apparatus having the above structure, every time the film F of one material R is pulled out and becomes empty, the film F 'is drawn from the other material R' and the film F 'is drawn. Must be repeatedly carried out around the conveyance path such as the film guide section 3 and the film folding section 4. In order to eliminate such complications at the time of replenishing the raw fabrics R and R ', as proposed in Japanese Utility Model Publication No. 58-20491 and Japanese Utility Model Application Publication No. A film end detecting device for detecting the end of the film, and a welding device for welding the end of the film F of the used raw material R to the beginning of the film F 'of the spare raw material R' are provided. Each time the film is detected, the welding device is operated by a detection signal from the film end detecting device, so that the raw materials R and R 'are obtained.
There is known a packaging apparatus capable of efficiently performing a replenishing operation.

[0004]

In the above-mentioned prior art packaging apparatus, the empty webs R, R 'are removed from the holding frame 2 by the worker neglecting to replace the webs R, R'. When packaging is performed up to the end of the films F and F 'while being attached to the film 2', the operation is temporarily stopped and the films F and F 'are stopped.
Must be re-routed to the transfer path in the apparatus. For this reason, during the operation of the apparatus, the films F, R 'are kept so that the raw fabrics R, R' do not constantly become empty.
The remaining amount of F 'has to be visually checked, and it is impossible to completely automate the operation of replenishing the raw materials R and R'.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an automatic film switching apparatus capable of completely automating the operation of replenishing a raw material in any case.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a pair of holding frames are detachably held with original rolls each having a film wound thereon.
A packaging machine for continuous packaging said one of the raw than the film and pull out the transfer, the film end detection means for detecting the end of said one film, said one raw This film end detection known means A film connecting means for joining the film end and the film starting end of the other material is provided, and the film remaining amount of both the material is detected, and the film remaining amount of both the material becomes less than a predetermined amount. In this case, a film remaining amount detecting means for forcibly stopping the transfer of the one film is provided.

[0007]

According to the above construction, when the end of the film of one of the webs is detected by the end of the film detecting means, the film connecting means connects the end of the film of the one web and the beginning of the film of the other web. As a result, automatic continuous film replenishment is performed by alternate raw materials. In addition, when the remaining film amount of both the raw materials becomes less than a certain amount, for example, due to the empty raw material remaining attached to the holding frame, the film pulled out from one of the raw materials by the film remaining amount detecting means. Transfer immediately stops.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. The same parts as those in FIG. 13 are denoted by the same reference numerals, and description thereof will be omitted. 1 to 12, a pair of upper and lower holding frames 2,
2 'is provided, and the film frames R, R' around which the films F, F 'are wound are respectively detachably mounted on the holding frames 2, 2'. A film slack preventing mechanism 14 is provided on the upper part of the machine base 1.
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 on the folding section 4.
There is provided an adjustment mechanism 16 for moving the. The adjusting mechanism 16 is provided on the upper part of the machine base 1 so as to be able to advance and retreat in a state in which the nut body 17 is prevented from rotating 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 mounted on the upper part of the machine base 1, and a return guide 9 having a U-shaped end is mounted on the nut body 17, and is located on both sides of the return guide 9. To provide a bar-shaped transfer guide 20
A guide rod 21 extending to an upper position of the horizontal seal portion 6 is hung down. 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 1 of the vertical seal portion 5 sandwiching the guide rod 21 and the nozzle 22
0 and 10 are arranged, and a bearing stand 23 is attached to the front of the machine base 1,
Gears 24, 24 that rotatably support the two vertical heat seal rolls 10, 10 and mesh with one vertical heat seal roll 10 and the other vertical heat seal roll 10, respectively, between the bearing stands 23. The driven gear 25 is integrally provided on one of the gears 24, and the driven gear 25 is meshed with a driving gear 27 driven by a driving device 26 provided in the machine base 1. A seal member 10A is formed on one side, knurling is performed on the outer peripheral surface of the seal member 10A, and a heater H
And a temperature sensor S, and a platinum resistor or the like whose resistance value changes with temperature is used as the temperature sensor S. 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 and 11 are rotatably supported between the tables 28, and a gear 29 meshing with one of the horizontal heat seal rolls 11 and the other horizontal heat seal roll 11 is fixed. A driven gear 30 is provided integrally with the gear 29, a driving gear 31 driven by a driving device 26 is meshed with the driven gear 30, and seal members 11A are attached at equal angular intervals to the outer periphery of the two horizontal heat seal rolls 11, and A heater H for heating the seal member 11A and a temperature sensor S are incorporated therein, and the temperature sensor S is made of a platinum resistor or the like whose resistance changes with temperature. Also, one of the first and second horizontal heat seal rolls
The gear 33 of the eleventh gear meshes with the gear 33 of the rotary encoder 32 to detect the rotation of the horizontal heat seal roll 11,
This rotation is sent 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 which forms a pair obliquely downward from the mounting base 35.
A 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 thereof by a shaft portion 36A. The film F is transported with the vertical seal F1 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, 11 have respective rotating shafts 10B, 11B,
One end of 11B is formed in a hollow,
A rotation shaft 38A of the power supply rotary transformer 38 is connected to one end of each of B, 11B, 11B via a connecting member 38B, and a temperature control rotary transformer 39 is provided at an end of the rotary shaft 38A. The power supply rotary transformer 38 has an annular stator-side iron core 41 fitted to the inner peripheral wall of the fixed case 40, and a winding 41A is wound around the stator-side iron core 41. A rotating shaft-side iron core 42 is formed on the rotating shaft 38A so as to oppose with an interval, and a winding 42A is wound around the rotating shaft-core 42. The fixed case 40 is attached to the machine base 1 via a bracket 43. Side, and the bearing 44
The rotation shaft 38A is provided rotatably through the
The heater H and the winding 42A of the rotating iron core 42 are electrically connected to each other by a power supply cord 45 inserted through the rotation shafts 38B and the rotation shafts 10B and 11B of each heat seal roll. 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.

A pair of rollers 54, 54 'for changing the running 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 'is fixed above 54', and films F, F are interposed between the guide rollers 55, 55 '.
′, The films F, F ′ in a state where all the films F, F ′ are unwound from the raw materials R, R ′.
Twisting of F 'can be prevented. Reference numeral 56 denotes a binding member fixedly straddling the guide rollers 55 and 55 ', and regulates the movement of the films F and F' in the lateral direction during the conveyance. Above the guide rollers 55 and 55 ', a film connection mechanism 59 having a fixed suction plate 57 and a movable suction plate 58 that can move in the horizontal direction in opposition to the fixed suction plate 57 is provided. A plurality of suction holes connected to an air suction mechanism (not shown) are provided on the surfaces of the plate 57 and the moving suction plate 58.
There are 60 provided. Further, above the film connection mechanism 59, a roller 61 and a tension sensor roller 62 as 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 raw fabric R and the tension of the film F becomes zero,
The end-of-film detection signal of the film F is transmitted to the film connection mechanism.
Output to 59. Meanwhile, 63 is a pivot arm rotatably provided on the outside approximately in the middle of the holding frame 2, 2 ', an ultrasonic sensor 64 serving as a film remaining detection known means to the distal end of the pivot arm 63 is distribution Is established. This ultrasonic sensor 64
Is to constantly measure the remaining amount of the film F or F 'from the thickness of the film F or F' wound on one of the raw materials R or R '.

Then, the raw fabric R is mounted on the upper holding frame 2, and the film F drawn from the raw fabric R is brought into contact with the rollers 54 and the guide rollers 55. After passing through the moving suction plate 58, the sheet is brought into contact with the roller 61 and the tension sensor roller 62, and is led out to the film guide section 3. Similarly, a spare material R 'is attached to the lower holding frame 2', and the film F 'from the material R' is brought into contact with the roller 54 'and the guide roller 55'. The start end 65 is moved by suction of air from the suction hole 60 to the movable suction plate 58.
And apply an adhesive 66 such as a double-sided tape or glue to the surface of the starting end 65 of the film F ′,
The ultrasonic sensor 64 is held in the direction of the upper material R in advance. Thus, the folded end portions of the film F are heat-sealed and sent out by the pair of vertical heat seals 10,
A film F formed into a tubular shape by the vertical seal F1
Is laterally heat-sealed by a pair of horizontal heat seal rolls 11 opposed to each other in the horizontal seal portion 6, whereby the film F formed into a bottomed cylindrical shape is filled with the article W to be packaged from the nozzle 22. The film F is fed, and the second horizontal sealing portion is again cut by the cutter unit 8, whereby the packaged object W is packaged. In this case, the film F before the horizontal seal filled with the article 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 6
The horizontal heat seal roll 11 performs stable horizontal sealing.

Thereafter, the film is wrapped in the above-mentioned predetermined procedure, and as shown in FIG. 3, the remaining amount of the film F wound around one of the raw materials R by the ultrasonic sensor 64 is a predetermined amount. For example, when it is detected that the thickness has reached 1 mm, the rotating arm 63 rotates, and the ultrasonic sensor 64 immediately detects the remaining amount of the film F 'in the other material R'. At this time, if there is a predetermined amount or more of the film F 'in the raw material R', the ultrasonic sensor 64 determines that the spare raw material R 'is loaded in the holding frame 2', and If the transfer is continued and the remaining amount of the film F 'is equal to or less than the predetermined value, the ultrasonic sensor 64 determines that the raw materials R and R' are both empty and forcibly forces the film F. Stop the transfer of Next, as shown in FIG. 4, when the film F ′ is wound around the raw material R ′ by a predetermined amount or more, when the film F is separated from the raw material R, the tension sensor roller 62 becomes the tension of the film F. Is zero, and it is determined that the end portion 67 of the film F has appeared, and the end detection signal is sent to the film connection mechanism.
Output to 59. At this time, as shown in FIG. 5 , the film connection mechanism 59 is operated by a timer (not shown) or the like.
After a predetermined time has elapsed, when the terminal end portion 67 of the film F passes through the film connection mechanism 59, the fixed suction plate 57 and the movable suction plate 58 are brought into close contact with each other. Thereby, the terminal end 67 of the film F and the start end 65 of the film F 'are joined by the adhesive 66,
As shown in FIG. 6, a film F 'from a raw material R' is used. In order to prevent the occurrence of defects at the time of joining the films F and F ', the cutting of the film F' by the cutter unit 8 is temporarily stopped until the joining of the films F and F 'is completed. Until the flow of the film F 'to be sent out is stabilized, the filling mechanism 12 stops filling the film F' with the packaged object W. In this way, the ultrasonic sensor 64 and the tension sensor roller 62 repeatedly detect the remaining amount of the films F and F 'of both the raw films R and R' and detect the end of the films F and F 'in use, thereby obtaining the original. The continuous transfer of the films F and F 'is automatically performed based on the anti-R and R'.

As described above, in the present embodiment, the original fabrics R and R 'each having the film F and F' wound thereon are detachably held by the pair of holding frames 2 and 2 ', respectively. In a packaging machine that pulls out and transfers the film F from the anti-R, and continuously packs the film F, a tension sensor roller 62 serving as a film end detecting means for detecting the end portion 67 of the one film F, and the one of the ones by the tension sensor roller 62 The end portion 67 of the film F of the material R and the other material R '
And a film connection mechanism 59 as a film connection means for joining the starting end 65 of the film F 'with the film F', and detecting the remaining amount of the films F and F 'of the two raw materials R and R'. An ultrasonic sensor 64 is provided as film remaining amount detecting means for forcibly stopping the transfer of the one film F when the remaining amount of both the raw materials R and R 'is less than a predetermined amount. From simply the film F in use
By joining the end 67 of the film F 'and the start 65 of the spare film F', not only can the packaging work be continuously performed by the pair of raw materials R and R ', but also, for example, the operation of the apparatus. If an empty raw material R, R 'remains attached to the holding frames 2, 2' due to the operator neglecting the replacement operation of the raw material R, R 'during the ultrasonic sensor, Since the transfer of the film F is temporarily stopped in a state where the film F is left on the raw material R by 64, only by mounting the spare raw material R 'on the holding frame 2', the raw materials R, R 'are continued. , And the work of replenishing the raw fabrics R and R 'can be favorably performed without drawing the film F' into the transfer path in the middle of 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-described embodiment, an automatic filling and packaging machine for liquid and the like has been described as an example. However, the present invention can be applied to a packaging machine using a stretch film and a packaging device such as a pillow-type packaging machine. Although a non-contact type ultrasonic sensor was used as the amount detection means, the thickness was directly detected by contacting a micro switch and a spring member with the film, or the film thickness was detected optically by a photoelectric tube or photo sensor. Alternatively, the ultrasonic sensors may be individually provided for the respective webs without connecting a switching mechanism such as a rotating arm. In addition, the end of one film,
Junction between the starting end of the other films, also by thermal welding it is possible to substitute, also film end detection known hand <br/> stage is not limited to the tension sensor, it is possible to use various other sensors .

[0017]

According to the present invention, there is provided a packaging machine for removably holding a raw material wound with a film around a pair of holding frames, pulling out the film from one of the raw materials, transferring the film, and continuously packing the film. a film end detecting means for detecting the end of said one film, provided with a film connection means for joining the film starting end of the other raw and film end of the one raw this film end detection known means And film remaining amount detecting means for detecting the remaining film amount of both of the raw materials and forcibly stopping the transfer of the one film when the remaining film amount of both of the raw materials becomes less than a predetermined amount. In addition, it is possible to provide an automatic film switching device of a packaging machine that can perform a supply operation of a raw material more favorably.

[Brief description of the drawings]

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

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

FIG. 3 is a front view of a main part when the remaining film amount of the raw material becomes equal to or less than a predetermined value according to the embodiment of the present invention.

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

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 one embodiment of the present invention.

FIG. 7 is a perspective view of a main part showing one embodiment of the present invention.

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

FIG. 9 is a schematic explanatory view of a main part showing one embodiment of the present invention.

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

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

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

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

[Explanation of symbols]

2,2' support frame 59 film attachment (film connecting means) 62 tension sensor roller (film end detection known means) 64 ultrasonic sensor (film remaining amount detecting means) F, F'film R, R'raw

Claims (1)

(57) [Claims] 1. A packaging machine for removably holding a raw material wound with a film on a pair of holding frames, pulling out the film from one of the raw materials, transferring the film, and continuously packing the film. a film end detecting means for detecting the end of the film, provided with a film connection means for joining the film starting end of the other raw and film end of the one raw this film end detection known means, both said Film remaining amount detecting means for detecting the remaining film amount of the raw material, and forcibly stopping the transfer of the one film when the remaining film amount of the two raw materials is less than a predetermined amount. Automatic film switching device for packaging machines.