JP2001335006A - Bag mouth sealer of bag making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus wherein each of two kinds of seal bars 40 includes a plate blade 57, cutting can be performed irrespective of changeover of the two kinds of seal bars 40, and the apparatus operates by a power unit synchronizing a guide pipe 38 with a rod 60 so that lowering of the seal bar 40 and lowering of a rammer 62 can be activated with specified timing. SOLUTION: A cross-shaped rotary body 52 is rotatably supported via a pin shaft 53 on a pair of hanging pieces 51 fixed to an upper beam 25, and the two kinds of seal bars 40 are placed at the right angle, while the seal bars 40 at the right angle are selectively fixed in a hanging state by notch pins 55. Each of the seal bars is equipped with the plate blade 57, wherein the blade 57 is energized to hide normally inside the seal bar 40 by tension of a coil spring 59 to be engaged with a knock pin 58 which is coupled with the blade 57. Immediately after a stay 61 and the rammer 62 lower integrally with the guide pipe 38 and the upper beam 25 for interposing a plastic wrapping material between them and a seal base for heat-sealing, the stay 61 and the rammer 62 lower by downward motion of the rod 60 for sticking the plate blade 57 through the knock pin 58 for cutting the wrapping material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag making method in which a tube film in which a large number of articles to be packaged are arranged at equal intervals and moves therein is heat-sealed so that each of the articles to be packaged is isolated. The present invention relates to a sealing device for a packaging machine.

[0002]

In order to heat seal the thermoplastic tube film, the tube film is pressed and heated with a metal seal bar, and the center of the heated portion is cut with a plate blade. By separating, the packaged object can be completely sealed in the plastic bag. However, there is also a use in which the package is transferred to a vacuum chamber to vacuum-treat the packaged object. In such a case, as shown in FIG. I need to put it. To solve such a problem, Japanese Patent Laid-Open Publication No.
Reference numeral 627 discloses a structure in which the main body 3 supports the rotary body 5 having four pins as shown in FIG. 9 and the rotary body is provided with two types of seal bars 6 and 7. According to the publication, the upper body 3
And the lower seal base 8 are revolved by the rotation of the crankpin, and the collision pressure between the seal bar 6 and the seal base 8 is received and buffered by a spring during the revolving orbit, so that the seal bar 6 and the seal base 8 makes it possible to press and heat the tube film 9 for a predetermined time. One seal bar 6 seals one side of the bag 1 as shown in FIG. 10, and the other seal bar 7 seals both sides of the bag.

In the above-described configuration, when the two types of bars 6 and 7 are switched by operating the rotating body 5, the plate blades 10 are dropped into the respective seal bars and mounted each time. As it protrudes from 6, film 9
Depending on the tension acting on the film 9,
There is a possibility that a problem occurs in that the plate blade 10 separates the tube film 9 before the pressure is applied.

[0004]

The present invention has been made to solve the above problems.
The upper and lower two pin rolls are respectively circulated along the deformed annular grooves by two upper and lower propellers arranged on a vertical line and tuned and rotated in the same direction, and a seal bar is integrally formed with a vertically long guide pipe supported by the two pin rolls. A means for moving along the deformed annular groove, and an intermediate roller rotating between the two props in a direction opposite to the two propellers, circulates the intermediate pin roll along the deformed annular groove and supports the intermediate pin roll on the intermediate pin roll. Means for moving the seal base along the deformed annular groove integrally with a slide sleeve slidably mounted on the guide pipe, and a blade arranged by a reaction force of a spring disposed in a gap inside the seal bar. A plate blade biasing in a direction to hide in the seal bar, and connected to an upper end of a rod slidably disposed in the guide pipe, and A push rod facing the knock pin connected to the blade, and an impacted element fixed to the lower end of the rod hanging down from the lower end of the guide pipe so as to be positioned on the rotary hammer rotation track at the tip of the lower propeller. .

The upper seal bar circulates the upper and lower two pin rolls along the deformed annular groove by two upper and lower propellers respectively, and moves the vertically long guide pipe supported by the two pin rolls along the deformed annular groove. Rotate. On the other hand, the lower seal bar is located between the two
The intermediate film rotating in the opposite direction to the above-mentioned propellers rotates integrally with the slide sleeve slidably mounted on the guide pipe, so that the tube film is heat-sealed at equal intervals by the seal bar and the seal base. . On the other hand, each time the rotating hammer at the tip of the lower
Acting on the impacted element at the lower end of the rod hanging down from the lower end of the guide pipe, the pushing rod connected to the upper end of the guide is arranged in the gap inside the seal bar and pushes the plate blade downward, so that the tube film is removed. Can be cut.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The front view of the apparatus shown in FIG. 2 is a vertical section of the center of the apparatus, and shows the left part. The exact apparatus has the same symmetrical structure connected to the right side. Further, FIG. 3 is connected below FIG. Therefore, the frame 11 has a rectangular frame shape. Three bearings 12, 13, and 14 are fixed to pillars along a vertical line on one side of the frame-shaped frame 11, and props 18, 19, and 20 are provided inside shafts 15, 16, and 17 supported by these bearings. In addition, pulleys 30 and 3
1 and 32 are fixed, and the respective pulleys are connected by a timing belt 33. Therefore, by inputting rotational power from the gear 34, the three
8, 19 and 20 can be tuned and rotated.

On the other hand, cam plates 21, 22, 23 each having a deformed annular groove 24 formed thereon are fixed to the inner surface of each bearing, and both ends of an upper frame member 25 horizontally arranged inside the upper part of the frame 11. Are engaged with the deformed annular grooves 24 in the uppermost cam plate 21, and the pin rolls 28 fixed to both ends of the lower frame member 26 are engaged with the deformed annular grooves 24 in the lower cam plate 23, respectively. Both pin rolls 27 and 28 are
0 is engaged. On the other hand, the pin rolls 35 supported on both ends of the intermediate frame member 34 are respectively inserted into the deformed annular grooves 2 of the intermediate cam plate 22.
4 is engaged.

As shown in FIG. 4, the deformed annular groove 24 formed in the cam plate is substantially semi-cylindrical. When the shaft 16 rotates the propeller 19 clockwise, the pin roll 28 which engages with the slit 29 of the propeller is Revolves along the deformed annular groove 24. In this case, the upper and lower two pin rolls 27 and 28 rotate clockwise, while the intermediate pin roll 3 rotates.
5 Rotate counterclockwise.

In FIG. 2, the upper frame 25 supports the guide pipe 38 with the tightening screw 37, while in FIG. 3, the lower frame 26 also supports the same lower end of the guide pipe 38 with the tightening screw 38. As a result, in FIG. 4, the guide pipe 38 has a pair of upper and lower pin rolls 27,
28 and moves along the trajectory of the deformed annular groove 24. This movement is transmitted to the seal bar 40 fixed to the upper frame 25 in FIG. The guide pipe 38
The upper and lower sides of the pipe are supported at two points by the pin rolls 27 and 28 in order to move the pipe stably.

As shown in FIG. 2, both ends of a lower frame 34 for fixing a seal stand 45 on the upper surface are supported by the guide pipe 38 via slide sleeves 46, respectively. Therefore, when the intermediate pin roll 35 revolves in the counterclockwise direction in the deformed annular groove 24 in FIG. 4, the position is stabilized by being supported by the slide sleeve 46 that slides the guide pipe 38 up and down. As a result, as shown in FIG. 5, the seal bar 40 and the seal base 45 are displaced along the dashed-dotted trajectory, and the tube film 47 is squeezed and heat-sealed in a constant cycle.

FIGS. 1 and 6 show an embodiment in which two types of seal bars are rotatably mounted on a pair 25. Two types of seal bars 40, 5 are attached to a pair of hanging pieces 51 fixed to the frame member 25.
In addition to supporting the cross-shaped rotating body 52 on which the “0” is set via a pin shaft 53, the two kinds of seal bars 40, 52 are provided by using two kinds of notch pins 55 and 56 provided on the rotating body.
The reference numeral 50 corresponds to the seal base 45 in a selective manner. Further, a plate blade 57 is provided inside each of the seal bars, and the plate blade 57 is biased so as to be hidden inside the normal seal bar 40 by the tension of a coil spring 59 engaged with a knock pin 58 connected thereto. I have.

1 and 2, the guide pipes 3 on both sides are used.
A stay 61 is erected between the upper ends of rods 60 slidably installed in the bracket 8, and a push rod 62 fixed to the stay is opposed to the knock pin 58 of the plate blade. Further, as shown in FIG. 3, the rod 60 has an impacted element 64 formed by a pulley mounted on a bracket 63 fixed to the lower end thereof, and a cylinder 65 fixed to the bracket 63 is slidably supported by a guide pipe 38. On the other hand, the rotary hammer 66 is installed at the tip of the lowermost prop 20.

Accordingly, as shown in FIG. 7, during the rotation transition of the shaft 17, the lower propeller 20 approaches the impacted element 64, and subsequently, as shown in FIG. 8, the rotary hammer 66 installed on the propeller pushes down the impacted element 64. . As a result, the rod 60 and the push rod 62 in FIG. 1 are pulled down and act on the knock pin 58, so that the plate blade 57 descends in FIG. 5 and cuts the middle of the seal portion of the tube film 47.
As described above, the operating power of the plate blade 57 is obtained from the rotational power of the lower prop 20, and the lower prop 20 rotates in synchronism with the other two props, so that there is no deviation in the timing between the film sealing and cutting. After the film is pressed by the seal bar, the film can be cut, and the two types of seal bars 40 and 50 each independently hold the plate blade 57.
Even if these two types of seal bars are switched, the hitting force of the rotary hammer 66 can be applied to each plate blade.

[Brief description of the drawings]

FIG. 1 is a front view of a seal bar and its support mechanism.

FIG. 2 is a partial explanatory view of the support mechanism.

FIG. 3 is a partial explanatory view of a support mechanism connected to FIG. 2;

FIG. 4 is a side view of a support mechanism connecting FIGS. 2 and 3;

FIG. 5 is an explanatory view of the operation of the seal bar and the seal base.

FIG. 6 is a side view of a switchable seal bar.

FIG. 7 is a diagram illustrating the operation of a rotary hammer.

FIG. 8 is a diagram illustrating the operation of a rotary hammer.

FIG. 9 is an explanatory view of a conventional example of a seal bar.

FIG. 10 is an explanatory view of a zipper.

[Explanation of symbols]

 15, 16, 17 ... shaft 18 ... upper prop 19 ... middle prop 20 ... lower prop 21 ... upper plate cam 22 ... intermediate plate cam 23 ... lower plate cam 24 ... deformed annular groove 25 ... upper frame 26 ... lower frame 34 ... Intermediate frame material 27 ... Upper pin roll 28 ... Lower pin roll 35 ... Intermediate pin roll 30, 31, 32 ... Pulley 33 ... Timing belt 38 ... Guide pipe 40,50 ... Seal bar 45 ... Seal base 46 ... Slide sleeve 51 ... Hanging piece 52 ... Rotating body 53 ... Pin shafts 55 and 56 ... Notch pin 57 ... Sheet plate 60 ... Rod 64 ... Impact element 66 ... Rotating hammer

Claims (2)

[Claims] 1. A vertically long guide pipe supported by both pin rolls, wherein the upper and lower two pin rolls are respectively circulated along two deformed annular grooves by two upper and lower propellers arranged on a vertical line and rotating in synchronization in the same direction. Means for integrally moving a seal bar connected to the guide pipe along the deformed annular groove, and an intermediate pin roll intermediately formed between the two propellers by an intermediate propeller rotating in a direction opposite to the two propellers. Means for circulating along the groove, supporting the intermediate pin roll and slidably covering the guide pipe, and means for integrally moving the seal base coupled to the slide sleeve along the deformed annular groove. A plate blade disposed in a gap inside the seal bar and biasing in a direction in which the cutting edge is hidden in the seal bar by a reaction force of a spring; A push rod connected to the upper end of a rod slidably disposed in the guide pipe and facing a knock pin connected to the plate blade; and An impact element fixed to the lower end of the rod hanging from the lower end of the guide pipe. 2. The apparatus according to claim 1, wherein the seal bar includes a plurality of seal bars each having a plate blade biased by a spring and capable of switching rotation.