JP4037892B2 - Seal device for belt type vacuum packaging machine - Google Patents

Description

  The present invention seals the packaging body by covering the belt from the upper region with the lid material every time the packaging body which is mounted on the conveyor belt at regular intervals and intermittently transports is temporarily stopped integrally with the belt. The present invention also relates to a sealing device for a packaging machine, in which the opening edge of the package is clamped and heated and sealed with a seal bar immediately after a vacuum is applied to the package in the package inside the lid.

  As described above, a packaging machine that applies a vacuum to an object to be packaged that is fed into a lid material one after another by a conveyor belt, as shown in Patent Document 1 below, has an opening edge of a packaging bag mounted on a belt conveyor. When the seal base fixed to the belt is carried as a pillow and the cover is covered around the wrapping bag, the seal bar provided in the cover is pressed against the opening edge on the seal base. A method of heating and welding the filament provided on the lower surface of the upper seal bar with an impulse current is used.

  In such a case, if the wrapping bag is made of aluminum foil or is made of a thick plastic, the problem is that the opening edge is insufficient in the amount of heat in the instantaneous high-current impulse method and welding is incomplete. There is. In general, the seal base and the seal bar are each provided with a filament, an impulse current is applied to both of these filaments, and the opening edge is welded with heat from both sides of the opening edge, but fixed to the conveyor belt. In order to apply a current to the sealed base, a rotary type current terminal is required, and at the same time, there is a problem that it is necessary to manage a power transmission foot wiring from this terminal.

Japanese Utility Model Publication No. 59-94004

  The present invention is an apparatus for solving the above-mentioned problems, and a package body in which a plurality of parallel seal stands facing the width direction of the belt conveyor are arranged at equal intervals on the outer surface of the belt conveyor, and these seal stands are used as pillows. The package body is sealed in the lid material by bringing the belt conveyor into the lid material arrangement region and lowering the lid material onto the belt conveyor, and the package body supported by the seal base The opening edge is clamped by a seal bar that descends from the inside of the lid toward the seal base, and the impulse current is applied by applying an impulse current from the first wiring connected to both ends of the first filament disposed on the lower surface of the seal bar. A sealing device for welding the opening edge is provided, and the sealing device is also connected to both ends of the second filament disposed on the upper surface of each sealing base in a state of being wire-connected to the belt conveyor surface. A pair of conductors that contact the pair of received electrons when the lid member is lowered are provided in the lid member, and the pair of receivers are passed through the second conductors connected to the pair of conductors through the same conductor. An impulse current is applied to the electrons.

  After all, the opening edge of the package is sandwiched between the upper first filament and the lower second filament, and the opening edge is heated and melted from above and below by applying impulse current to each of the two filaments. In the case of a rotary vacuum packaging machine comprising a belt conveyor for transporting the package and a lid for sealing the package, the conventional rotary current terminal equipment, which requires management and maintenance costs, is simplified and the inner surface is made of thermoplastic resin. This makes it possible to seal a package that requires a high amount of heat, such as an aluminum foil that is synthesized from the above.

  FIG. 3 is an overall side view of the rotary vacuum packaging machine. The packaging machine stretches a belt conveyor 13 around two pulleys 12 supported by a frame 11 at a predetermined interval, The respective seal stands 14 are arranged in parallel at equal intervals on the outer surface of the belt conveyor so that the longitudinal direction of the elongated seal stands 14 is directed in the width direction of the belt conveyor 13, and the respective seal stands 14 are used as pillows. The package 10 to be mounted is configured to be intermittently conveyed one pitch at a time by the rotation of the belt conveyor 13 that slides on the surface plate 15, and the lower surface opening type lid member 20 is placed in the lid material arrangement region 16. It arrange | positions so that it may move up and down via the rack 21 hanging from the material.

  That is, when the pinion 22 engaged with the rack 21 is rotated forward and backward by the motor 23, the lid member 20 moves up and down. When the belt conveyor 13 moves, the lid member 20 moves to the same belt. It is located in the upper region away from the conveyor 13, descends at the timing of stopping the belt conveyor 13, and comes into close contact with the belt conveyor 13. In this case, since the detector 24 for detecting the rotation angle of the motor 23 and the feedback signal circuit 26 connecting the electronic controller 25 detects the vertical movement of the lid member 20 and controls the movement of the lid member. is there.

  More specifically, as shown in FIGS. 1 and 2 which are partially enlarged views, the belt conveyor 13 slides on the surface plate 15 described above, and in this case, the opening edge of the package 10 is The sealing table 14 fixed to the conveyor belt 13 is moved as a pillow. In the lid material arrangement region, the lid material 20 is in close contact with the Bayer belt conveyor 13 via the endless packing 28 at the lower edge to seal the package 10.

  The lid member 20 includes a seal bar 29 inside so as to face the seal base 14. Guide rods 31 standing on both ends of the seal bar 29 are movable up and down on the lid member 20 via sleeves 32, and are installed between spring receivers 33 fixed to the upper ends of the respective guide rods 31. The seal bar 29 is pulled up by the tension spring 34 to set an upper limit position, but air pressure is applied to the sealed flexible bag 35 disposed between the ceiling surface of the lid member 20 and the seal bar 29. Then, the seal bar 29 moves downward, and the opening edge of the package 10 is clamped with the seal base 14.

  The seal bar 29 is provided with a first filament 30 screwed to the lower surface thereof, while the seal base 14 is provided with an upper surface second filament 40 screwed. Further, both ends of the first filament 30 are connected to the power source 37 via the first wiring 36 (see FIG. 4).

  In the vicinity of both ends of the seal bar 29, a pair of conductors 50 are installed via a buffer spring 44 in a non-conductive case 43 of a lower surface opening type fixed to the ceiling surface of the lid member with screws 42. The conductor 50 is connected to the power source 46 through the second wiring 45 (see FIG. 4).

  A pair of received electrons 60 are arranged on the conveyor belt 13 below the pair of conductors 50, and the pair of received electrons 60 are connected to both ends of the second filament 40 via connecting lines 47. The normally open switch 70 is installed on the first wiring 36 and the second wiring 45.

  At the end of the downward movement of the lid member 20 toward the conveyor belt 13, the conductor 50 compresses the buffer spring 44 and contacts the electron receiver 60. Immediately after that, the seal bar 29 descends and comes into pressure contact with the seal base 14 by carrying compressed air into the flexible bag 35. When the timing of the pressure contact is transmitted from the detector 24 in FIG. 3 to the controller 25, a signal is transmitted to the operating device 49 in FIG. 4, the normally open switch 70 is closed and the first filament 30 and the second filament 40 are closed. The impulse current is sent, and the opening edge of the package body clamped by the seal bar is heat-sealed for a specified time.

Partial enlarged view of the device Front view of the previous figure Side view of rotary vacuum packaging machine Front view of sealing device

Explanation of symbols

10... Packaged body 13... Belt conveyor 14... Seal base 16... Cover material placement area 23... Motor 24... Detector 25. Flexible bag 36 ... 1st wiring 40 ... 2nd filament 45 ... 2nd wiring 47 ... Connecting wire 49 ... Actuating device 50 ... Conductor 60 ... Electron receiving 70 ... Normally open switch

Claims (2)

On the outer surface of the belt conveyor, a plurality of parallel sealing stands facing in the width direction of the belt conveyor are arranged at equal intervals, and the packaging body using these sealing stands as a pillow is carried into the lid material arrangement region by the belt conveyor, and The packaging body is sealed in the lid material as the lid material is lowered onto the belt conveyor, and the opening edge of the packaging body supported by the sealing base is directed from the inside of the lid material to the sealing base. A sealing device for holding the opening edge by applying an impulse current from the first wiring connected to both ends of the first filament disposed on the lower surface of the seal bar while being clamped by the descending seal bar,
The sealing device also provides a pair of electrons received on the surface of the belt conveyor in a state of being connected to both ends of the second filament disposed on the upper surface of each seal base, and contacts the pair of electrons received when the lid member is lowered. A device configured to apply an impulse current to the pair of received electrons from the second wiring connected to each of the pair of conductors through the same conductor. The momentum of the motor that moves the lid member up and down is transmitted to the controller via the detector, and the controller detects the timing at which the pair of conductors integrated with the lid member contacts the pair of received electrons. A timing detection signal is used to close an normally open switch installed in each of the first wiring and the second wiring and to apply an impulse current to the both wirings after the pair of conductors and the pair of received electrons contact each other. The apparatus according to 1.