KR100799926B1 - Sealer - Google Patents

Abstract

A heat sealer is provided to be improved so as to elevate an upper sealing bar with a simple structure and set an elevation stroke large at the same time. A heat sealer includes a supporting frame(26), an electromagnet(54), a horizontal shaft(32), and a crank arm(34). One end of the supporting frame is connected to an inner bracket(28) by a pin(30) in a cabinet. The other end of the supporting frame is movably disposed as a free end. The electromagnet moves a connecting member(38) to a sealing position through a center thrust stick(56). The horizontal shaft is rotatably supported at the other end of the supporting frame. The horizontal shaft rotates and reversely rotates by being connected with a sealing motor(48) through a driving belt(46). The crank arm is disposed between both sides of the horizontal shaft and a crank shaft(36) fixed at a lower end of the connecting member. The crank arm repeatedly elevates the connecting member between an opening position and a sealing preposition.

Description

Heat Sealer {SEALER}

1 is a side cross-sectional view of a heat sealing apparatus according to the present invention.

Figure 2 is a front sectional view of the heat sealing device according to the present invention.

3 is a schematic perspective view showing a mutual relationship between the configurations shown in FIGS. 1 and 2.

4 is a schematic diagram of a circuit connection applicable to the present invention.

5 is a view corresponding to FIG. 1 showing an initial state of operation of the invention;

6 is a flow chart for explaining the control relationship of the apparatus of the present invention.

<Description of the symbols for the main parts of the drawings>

2: cabinet 4: upper sealing bar

6: lower sealing bar 8: outer bracket

10: shaft 12: support rod

14: nozzle 16: the belt

18: idle pulley 20: drive pulley

22: nozzle drive motor 24: holder

26: support frame 28: inner bracket

30: pin 32: horizontal axis

34: crank arm 36: crankshaft

38: connecting member 40: bracket

42: connecting pin 44: driven pulley

46: drive belt 48: sealing motor

50: drive pulley 52: return means

520: return bracket 522: return spring

524: spring sheet 526: bar

54: electromagnet 56: push rod

58: Support 60: First Timing Cam

62: second timing cam 64: foot switch

66-74: 1st-5th sensor 76: Emergency switch

Korean Patent No. 337110

The present invention provides a heat sealing device having a pair of sealing bars for pressing and fixing an opening of a heat-sealed bag from above and below and heat-bonding, and a nozzle for exhausting air in the bag before heat-bonding, in particular the lifting operation of the sealing bar. It is possible to utilize the internal space by improving the structure related to the sealing bar relates to a heat sealing device of the configuration that can be lifted and interlocked with a larger stroke.

The conventional heat sealing device is configured to operate a pair of sealing bars by two pneumatic cylinders connected in series, and the inventors are interlocked up and down according to the rotation of the cam attached to the electric motor as proposed by Korean Patent No. 337110. It is known to have a configuration in which the upper sealing bar is lowered to the sealing preliminary position by the cam follower and then thermally joined while being lowered to the sealing position by the magnetic force of the electromagnet at this position.

The heat sealing device with the former pneumatic cylinder has the inconvenience of having to separately provide an air compressor, but the latter heat sealing device may be operated without an air compressor because it is equipped with an electric motor. However, since the rotational movement of the cam attached to the electric motor is a structure in which the upper sealing bar is interlocked up and down via the cam follower arranged around the cam, the lifting stroke of the upper sealing bar cannot be set to be larger than a predetermined value. .

In addition, the cam and the cam follower has a problem that the internal structure of the device is complicated, which makes it difficult for the operator to handle the maintenance.

The present invention is to provide a heat sealing device that can improve the setting of the lifting stroke and at the same time the upper sealing bar can be raised and lowered in a concise structure in order to solve the problems seen in the conventional heat sealing device described above. There is a purpose.

In addition, the present invention is to provide a heat sealing device improved to a structure that can simplify and easy maintenance, according to the structure of the device can be simplified.

According to the present invention for realizing the above object, an upper sealing bar is attached to a free end of a supporting rod having one end axially supported on the outside of the cabinet, and the lower sealing bar is attached to and fixed to the outside of the cabinet in a position opposite to the upper sealing bar. The support rod is a heat sealing device that is connected to the connection member extending from the inside of the cabinet to the lifting and interlocking, the one end is axially connected to the inner bracket by the pin in the inside of the cabinet and the other end to the free end A support frame arranged to be swingable; An electromagnet for moving said connecting member to a sealing position through a center push rod interlocking with magnetic force above said support frame; A horizontal shaft rotatably supported at the other end of the support frame and connected to the sealing motor via a driving belt to be rotated forward and backward; And a crank arm interposed between both ends of the horizontal shaft and a crank shaft integrally fixed to the lower end of the connecting member to repeatedly lift the connecting member between an open position and a sealing preliminary position.

In the above configuration, it is preferable that the sealing motor employs a motor capable of forward and reverse rotation. DC motors are generally used as forward and reverse rotation motors, but single-phase series AC motors may also be used as AC motors.

In addition, a return means for returning the connecting member from the sealing position to the sealing preliminary position may be further disposed on the free end side of the support frame when the magnetic force of the electromagnet disappears.

The return means includes a return bracket fixed to the free end of the support frame, a return spring installed therein, and a rod supporting the return spring through the spring seat and the return bracket. It may be of a configuration that is supported to maintain a constant height on the side.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing a structure of a heat sealing apparatus according to the present invention, FIG. 2 is a front cross-sectional view, FIG. 3 is a schematic perspective view showing the mutual relationship between the components shown in FIGS. 1 and 2, and FIG. 4 is an upper side. A side cross-sectional view of an open position state where the sealing bar is located at the top dead center.

1 shows a heat sealer capable of thermally bonding an opening of an envelope made of polyethylene or polypropylene film.

The heat seal device has an upper sealing bar 4 and a lower sealing bar 6 which are arranged up and down on an upper side of the cabinet 2, and the upper sealing bar 4 has an outer side of the cabinet 2. One end is attached to the other end side free end of the support rod 10 connected to the bracket 8 by the shaft 10, and the lower sealing bar 6 opposite to this is fixed on the cabinet 2.

The lower sealing bar 6 is provided with a resin cover, a heater, a Teflon tape and the like as in FIG. 4 of Korean Patent Registration No. 337110, but the illustration of these components is omitted in this embodiment.

Below the support rod 12, a nozzle 14 for sucking air in the bag is arranged to move back and forth between the upper and lower sealing bars 4 and 6 in a predetermined order.

In this embodiment, the idle pulley 18 and the driving pulley 20 which support the traveling belt 16 are disposed on the upper side of the cabinet 2 so as to move forward and backward of the nozzle 14, and the nozzle driving motor. While the drive pulley 20 is rotated forward and backward by the 22, the holder 24 is attached to the traveling belt 16 and the nozzle 14 is mounted thereon.

On the other hand, the support frame 26 is disposed inside the cabinet 2.

One end of the support frame 26 is axially connected to the inner bracket 28 provided in the cabinet 2 through the pin 30, and the other end is installed to be freely swingable up and down, and the horizontal shaft 32 ) Is installed across the shaft.

One end of the crank arm 34 is integrally attached and fixed to both ends of the horizontal shaft 32, while the other end of the horizontal shaft 32 is connected to the lower end of the connecting member 38 via the crank shaft 36 rotatably supported by the shaft. It is. Here, the crankshaft 36 and the connecting member 38 must be fixed integrally so that the cranking motion appears when the crank arm 34 rotates.

In addition, the upper end of the connection member 38 extends to the outside of the cabinet 2 and is axially connected to the middle of the support rod 12. In this embodiment, the upper end of the connection member 38 is a bracket 40. It is formed and the support rod 12 is sandwiched in the center and has a structure supported by the connecting pin 42 axially.

A driven pulley 44 is provided in the middle of the horizontal shaft 32, which is connected to the output pulley 50 of the sealing motor 48 via the drive belt 46.

The sealing motor 48 may employ a direct current motor or a single-phase series AC motor.

In addition, the return means 52 is attached to the free end side of the support frame 26, the electromagnet 54 is disposed above, the push rod 56 provided through the center thereof is attached to the support frame 26. It is extended to the nearest position.

In this structure, the magnetic force generated by the energization of the electromagnet 54 acts on the pusher 56 and protrudes downward, and as a result, the pusher 56 is supported by the support frame 26 in a direction that resists the return means 52. Pressed down.

The return means 52 of the support frame 26 may be embodied in various forms. In this embodiment, the return bracket 520 attached to the free end of the support frame 26 is fixed, and the return spring installed therein ( 522 and the spring sheet 524, and the rod 526 penetrating the return bracket 520 to support the return spring 522 to be supported at a predetermined height by the support piece 58 located on the bottom side It is.

Referring to FIG. 2, the return means 52 are disposed at both ends of the support frame 26, and the crank arm 34 and the connecting member 38 are also arranged in pairs, respectively, and a pair of timing cams 60 are provided. (62) is integrally provided on the horizontal shaft (32).

Accordingly, the crank arm 34 causes the cranking motion during the rotational drive of the horizontal shaft 32 to cause the connecting member 38 to be lifted and linked between the top dead center and the bottom dead center.

In the configuration of the present invention as described above, the interrelationship of each part is well depicted through FIG.

Referring to FIG. 3, it can be seen that the foot switch 64, the first to fifth sensors 66 to 74, and the emergency switch 76, which are not depicted in FIGS. 1 and 2, are further provided.

The foot switch 64 is a switch for forward driving the sealing motor 48 whenever the operator operates by foot, and the emergency switch 76 immediately presses the worker's hand in an emergency situation. The switch rotates to raise the upper sealing bar 4.

In addition, the first and second sensors 66 and 68 emit detection signals when the nozzle 14 moves to the forward or backward position, respectively, and the third sensor 70 is located at the top dead center of the connection member 38. In this case, the detection signal is emitted when the gap between the upper sealing bar 4 and the lower sealing bar 6 is opened to the maximum, and the fourth sensor 72 has the connection member 38 located at the bottom dead center. The detection signal is issued at a sealing preliminary position where the gap between the upper sealing bar 4 and the lower sealing bar 6 is narrowed, and the fifth sensor 74 detects at the sealing position at which the connecting member 38 is further lowered. As the signals are emitted, all of them can be used by selecting one of a micro switch, a limit switch, or a proximity sensor.

4 is a circuit configuration diagram applicable to the present invention, wherein the sealing motor 48, the first and second timing cams 60 and 62, the nozzle 14 and the nozzle driving motor 22, and these The connection relationship between the foot switch 64 for controlling a structure, the 1st-5th sensors 66-74, and the emergency switch 76 is shown.

The sealing motor 48 is provided with a sealing side forward rotation switching element S1 for closing the forward rotation power supply line and a sealing side reverse rotation switching element S2 for closing the reverse rotation power supply line. The element S1 is connected to be turned on or off by the output signals of the foot switch 64, the third sensor 70, and the emergency switch 76, and the reverse rotation switching element S2 is the emergency switch 76. Turns on and off only with the output signal.

By this circuit connection, the forward rotation switching element S1 is turned on by the output signal of the foot switch 64, and the forward rotation of the sealing motor 48 is started.

When the emergency switch 76 is operated during the forward rotation of the sealing motor 48, the forward rotation switching element S1 is turned off and the reverse rotation switching element S2 is turned on so that the sealing motor 48 immediately drives the reverse rotation. Done.

In the normal rotation, the sealing motor 48 is driven to rotate forward until the third sensor 70 is touched by the first timing cam 60, for example, rotates 180 degrees and stops.

That is, when the sealing motor 48 rotates 180 degrees, the third sensor 70 is touched to turn off the forward rotation switching element S1 to stop.

The foot switch 64, the third sensor 70, and the emergency switch 76 employ a normally open switch in this embodiment.

Similar to the circuit configuration for the forward and reverse rotation of the sealing motor 48 as described above, the nozzle drive motor 22 also supplies a power supply with the nozzle side forward rotation switching element S3 and the nozzle side reverse rotation switching element S4 interposed therebetween. At the same time, the nozzle side forward rotation switching element S3 is connected by the first sensor 66 and the nozzle side reverse rotation switching element S4 is triggered by the second sensor 68, respectively. In addition, the nozzle side forward rotation switching device S3 is turned on or the nozzle side reverse rotation switching device S4 is turned on according to the switching state of the fourth sensor 72.

More specifically, the fourth sensor 72 immediately turns on the nozzle side reverse rotation switching element S4 via the first phase for directly turning on the nozzle side forward rotation switching element S3 and the delay circuit De. And two phases capable of operating the nozzle side timer T1 for operating the vacuum pump P of the nozzle 14 for a predetermined time, and one input stage selectively connected to the one and two phases. 3-phase changeover switch.

Of course, the first sensor 66 and the second sensor 68 may be configured as a normally open switch.

The output terminal of the second sensor 68 which is turned on the nozzle side reverse rotation switching element S4 may be connected to an input terminal of the electromagnet-side timer T2 to operate it.

The diode D interposed at the trigger stage of the nozzle side reverse rotation switching element S4 is applied to the electromagnet side timer T2 via a delay circuit De via a signal output from one phase of the fourth sensor 72. It is a diode for preventing reverse flow.

The operation of the apparatus of the present invention having the above-described configuration may be automatically controlled by a normal control means or may be represented by sequence control according to the circuit connection of FIG. 4, and as shown in FIG. 5, the connecting member 38 ) Is located at the top dead center, the maximum sealing distance between the upper sealing bar (4) and the lower sealing bar (6), through which the nozzle 14 is started in the open position projecting outward.

Referring to the flow chart of FIG. 6, the operation relationship will be described. In the configuration with the conventional controller, the controller checks the one-phase switching of the fourth sensor 72 at the initial stage of operation and proceeds to the next step. Since the rotation of the 32 is 0 degrees or 360 degrees, the connecting member 38 is raised to the top dead center, so that the fourth sensor 72 is in a single-phase switching state. There is no.

In the open position, the operator inserts the opening of the envelope C to be sealed between both sealing bars, mounts the nozzle 14 therein, and operates the foot switch 64. Then, the sealing motor 48 rotates forward. The driving starts, and the forward rotation at this time proceeds until the first timing cam 60 touches the third sensor 70 and ends with a 180 degree rotation of the horizontal axis 32. As a result, the connecting member ( 38 moves to the bottom dead center to lower the upper sealing bar 4 to form a gap L (see FIG. 1) between the lower sealing bar 6 and the second timing cam 62. Interfering with 72 converts to a sealing preliminary position that is switched in two phases.

When the nozzle-side timer T1 is operated by the two-phase switching of the fourth sensor 72, exhausting through the nozzle 14 is started for a predetermined time, and air in the bag C is removed.

In the sealing preliminary position, the exhaust through the nozzle 14 is maintained for the time set by the timer T1, and the delay circuit De is exhausted by delaying and outputting the two-phase output signal of the fourth sensor 72 for a predetermined time. At the end of the process, the nozzle side reverse rotation switching device S4 is turned on to start the reverse rotation driving of the nozzle driving motor 22.

The reverse rotation of the nozzle drive motor 22 is continued until the second sensor 68 is touched and the nozzle side switching element S4 is turned off. As a result, the nozzle 14 is reversed and the envelope ( C) is exited from the opening of the C, the nozzle drive motor 22 is stopped by the touch of the second sensor 68 and at the same time the electromagnet side timer (T2) is operated, this time the electromagnet 54 for a predetermined time It is energized.

The energization of the electromagnet 54 causes the pusher 56 to lower the support frame 26 on the lower side in the direction of resisting the return means 52, so that the connecting member 38 is lower than the bottom dead center. It is converted into a sealing position that is lowered into position.

Although the support frame 26 is pressed by the pusher 56 in the drawing of this embodiment, the same operation and effect can be obtained also by the structure in which the horizontal axis 32 is pressed.

The sealing position movement of the connecting member 38 by the pusher 56 eliminates the gap L between the upper sealing bar 4 and the lower sealing bar 6 so that the opening of the envelope C sandwiched therebetween is closed. At the same time, the fifth sensor 74 is switched on to thermally seal the envelope C.

In the present invention, the heat-sealed sealing of the envelope (C) is to be performed by the heating of the band heater fed through the transformer for a predetermined time as in the conventional apparatus, so a detailed description thereof will be omitted.

Since the excitation force of the electromagnet 54 is extinguished and the pressing force of the pusher 56 is also extinguished after the time set by the electromagnet side timer T2 passes, the support frame 26 is sealed according to the elastic action of the return means 52. After returning to the preliminary position, the gap between the two sealing bars 4 and 6 forms a predetermined interval L (see FIG. 1) and the fifth sensor 74 is switched off.

In this state, if the operator operates the foot switch 64 once more, the forward rotation driving of the sealing motor 48 starts again. In this case, the horizontal shaft 32 is rotated 360 degrees so that the first timing cam 60 is connected to the third sensor. Touch 70 again to stop the rotation of the sealing motor 48.

As the connecting member 38 moves to the top dead center again by the 360 degree rotation of the horizontal axis 32, the fourth sensor 72 is converted into the single phase switching again.

The one-phase output of the fourth sensor 72 turns on the nozzle side forward rotation switching element S3 so that the nozzle drive motor 22 is rotated forward until the first sensor 66 is touched. The nozzle 14 protrudes outwards between the upper and lower sealing bars 4 and 6, and is initially opened as the nozzle driving motor 22 is stopped due to the touch of the first sensor 66 at the position. The position is repeated to repeat the above process.

Although the above-described embodiment has been described as an example in which a DC motor is used as the sealing motor 48, the sealing motor 48 may be rotated in the same forward and reverse directions even when a single phase series AC motor is applied.

As described above, the heat sealing device of the present invention is a pair of crank arms driven by the sealing motor to the outside of both ends of the support frame to connect the connecting member for raising and lowering the upper sealing bar up and down, the configuration of the device Complex power transmission mechanisms such as cams and cam followers can be omitted, resulting in a very compact configuration.

In addition, since the internal space of the cabinet is not compact, it is easy to repair or replace parts of the device, and in particular, since the lifting stroke of the connecting member is determined by the rotational movement of the crank arm, the upper and lower sides of the upper sealing bar than the conventional structure. There is an advantage that the stroke can be set large.

In addition, since it is a configuration that can perform the sequence operation of the device only by the sensor consisting of a foot switch and micro switches, it is possible to automatically operate without a separate control means such as a microcomputer or a program logic controller, so there is a big advantage in component reduction.

Claims (4)

The upper sealing bar is attached to the free end of the supporting rod whose one end is axially supported on the outside of the cabinet, and the lower sealing bar is fixed to the outside of the cabinet in a position opposite to the upper sealing bar, while the supporting rod is provided inside the cabinet. In the heat sealing device which is connected to the connection member extending to the outside, and configured to move up and down, A support frame having one end axially connected to the inner bracket and a second end freely swingable by a pin in the cabinet; An electromagnet for moving said connecting member to a sealing position through a center push rod interlocking with magnetic force above said support frame; A horizontal shaft rotatably supported at the other end of the support frame and connected to the sealing motor via a driving belt to be rotated forward and backward; And a crank arm interposed between both ends of the horizontal shaft and a crank shaft integrally fixed to the lower end of the connecting member to repeatedly raise and lower the connecting member between an open position and a sealing preliminary position. The heat sealing apparatus according to claim 1, wherein said sealing motor is one type selected from a forward-reversely rotatable DC motor or a single-phase series AC motor. The heat sealing apparatus according to claim 1, further comprising a return means for returning the connecting member from the sealing position to the sealing preliminary position when the magnetic force of the electromagnet disappears at the free end side of the support frame. The bottom side of claim 3, wherein the return means comprises a return bracket fixed to a free end of the support frame, a return spring installed therein, and a rod supporting the return spring through the spring seat and the return bracket. Heat sealing device that is configured to be supported to maintain a certain height on the support piece located in.

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