JPH0678206U - Seal bar actuating device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a device for stably operating a pair of seal bars for welding an unsealed portion of a packaging material along a trajectory similar to box motion. [Structure] Both ends of frame members 26 and 29 are rotatably supported at eccentric positions of upper and lower gear rotating bodies 20 and 21, respectively.
Vertical guide rods 32 are slidably supported by sleeves formed at the ends of the upper and lower bridge members 26 and 29, respectively, and a boss 33 at the middle portion of the vertical guide rods is attached to the machine base wall 19 via brackets 34 at both ends. A fixed horizontal guide 36 is slidably supported. By the rotation of the pair of upper and lower rotating bodies 20, 21 in opposite directions, the frame members 26, 29 revolve as shown by the arrow 24. The frame members 26, 29 are revolved while being supported by the cross-shaped guides 32, 36. Seal bar 37,
38 to operate stably.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an actuating device for actuating a pair of seal bars on a trajectory similar to a box motion for sandwiching a thermoplastic packaging material.

[0002]

[Prior art]

 Japanese Unexamined Patent Publication No. Hei 1-64687 discloses a device shown in FIG. 5 attached to a separate sheet. That is, a pair of gears 1 and 2 of the same diameter that mesh with each other and rotate in opposite directions, a guide bar 4 supported by an eccentric portion of the gear 1 on one side via a pivot 3, and an eccentricity of the gear 2 on the other side. A pin 6 penetrating the portion and having its tip engaged with a slit guide 5 formed on the guide bar, an upper seal bar 7 connected to the upper end side surface of the guide bar, and a lower seal bar 8 connected to the pin 6. By rotating both gears 1 and 2, both pins 3 and 6 are displaced along the orbits shown by arrows 9 and 10, respectively, and the packing material is sandwiched between them by the approach of the upper and lower seal bars 7 and 8. Heat with pressure.

[0003]

[Issues to be solved by the device]

 However, when the pivot 3 is at the top dead center 3a and the pin 6 is at the bottom dead center 6a, the distance 9 between the two points supporting the guide bar 4 becomes extremely narrow, and the guide bar 4 becomes unstable, resulting in high speed. There is a drawback that vibration occurs due to rotation. Therefore, an object of the present invention is to provide a device for stably operating both upper and lower bars.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention supports a pair of upper and lower rotating bodies 20 and 21 supported on opposite sides of a machine base wall 19 so as to rotate in opposite directions, and an eccentric portion of the upper rotating body 20. An upper frame member 26 rotatably installed between them, a lower member member 29 rotatably installed between eccentric parts of the lower rotor 21, and both ends of the upper and lower member members 26, 29. Two vertical guide rods 32 slidably provided in the vertical direction on the upper and lower parts, and a horizontal guide 36 for engaging the vertical guide rods 32 between the upper and lower bridge members and guiding the vertical guide rods in the horizontal direction, A pair of upper and lower seal bars 37 and 38 arranged between the facing surfaces of the upper and lower bridge members 26 and 29, and a cushion spring 39 interposed between the at least one bridge member and the seal bar. I did it.

[0005]

[Action]

 When the pair of upper and lower rotors 20 and 21 rotate in opposite directions, the upper and lower bridge members 26 and 29 rotatably provided on the eccentric parts of the two rotors approach and separate from each other in opposite directions of the revolution trajectory. To do. In this case, since the vertical guide rod 32 provided at the ends of the upper and lower bridge members so as to be slidable in the vertical direction is also supported by the horizontal guide 36, the vertical guide rod 32 supporting the upper and lower bridge members 26, 29 is As the material revolves, it moves laterally along the horizontal guide 36, and as a result, the upper and lower bridge members 26, 29 are prevented from rotating and their postures are stabilized. Therefore, when the pair of seal bars 37 and 38 provided between the upper and lower bridge members 26 and 29 via the cushion springs 39 and 40 contact each other, the cushion spring is compressed to clamp the packaging material. For a predetermined time.

[0006]

【Example】

 As shown in FIG. 2, the machine base wall 19 rotatably supports rotating bodies 20 and 21 formed by a pair of upper and lower gears via a central shaft 23. These rotating bodies are formed on the peripheral surface. The teeth are meshed with each other, and input from the shaft 23 causes them to rotate in opposite directions as indicated by an arrow 24 in FIG. In FIG. 2, only the machine base wall 19 on one side is shown, but there is also a machine base wall facing the other side, and a similar pair of upper and lower rotating bodies is provided.

As shown in FIG. 2, both ends of the upper frame member 26 are supported through ball bearings 27 in the holes 25 formed at the eccentric positions of the upper rotors 20 on both sides, and the lower rotors on both sides are supported. Both ends of the lower erection member 29 are also supported by the ball bearings 30 in the hole 28 formed in the eccentric position 21. The vertical guide rods 32 are slidably passed through the sleeves 31 formed at both ends of the upper and lower bridge members, and the bosses 33 formed at the middle portions of the vertical guide rods 32 are attached to the brackets 34 at both ends as shown in FIG. It is engaged with a horizontal guide 36 which is supported by the machine base wall 19 via Therefore, when the upper and lower erection members 26 and 29 revolve as indicated by the arrow 24 by the rotation of the upper and lower rotators 20 and 21, these both erection members 26 and 29 are vertically displaced along the vertical guide rod 32 and are vertically moved. Since the guide rod 32 is displaced laterally along the horizontal guide rod 36, both the erection members 26 and 29 are stable without rotating.

As shown in FIG. 2, a pair of seal bars 37 and 38 are further provided between the two bridge members 26 and 29 via cushion springs 39 and 40, respectively. As shown in FIG. 1, when the upper and lower bridge members 26 and 29 revolve in opposite directions and the upper and lower seal bars 37 and 38 are compressed, the cushion springs 39 and 40 are compressed, and the upper and lower seal bars are as shown in FIG. Since the orbits 41 and 42 revolve, the packaging material can be pressed by the horizontal orbit portion 43 to apply heat of welding. If the lower cushion spring 40 is removed, only the upper cushion spring 39 compresses, so that both seal bars revolve around the tracks 44 and 45 as shown in FIG.

[0009]

【effect】

 According to the present invention, the vertical erection members supported by the eccentric parts of the upper and lower rotating bodies are supported by the vertical guide rods, and the vertical guide rods are supported by the horizontal guides fixed to the machine base wall. Although it is supported by the cross-shaped guide, the gap in the slide guide is smaller, and the sealer can be operated stably along a trajectory similar to box motion.

[Brief description of drawings]

[Figure 1] Internal side view

[Figure 2] Front view

[Fig. 3] Orbital diagram of the seal bar

[Figure 4] Orbital diagram of the seal bar

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

20, 21 ... Gear 26 ... Upper installation material 29 ... Lower installation material 32 ... Vertical guide rod 36 ... Horizontal guide rod 37, 38
… Seal bar 39, 40… Cushion spring

Claims (2)

[Scope of utility model registration request] 1. A pair of upper and lower rotors 2 supported on opposite sides of the machine base wall 19 so as to rotate in opposite directions.
0, 21, an upper bridge member 26 rotatably installed between the eccentric parts of the upper rotary body 20, and a lower bridge member rotatably installed between the eccentric parts of the lower rotary body 21. 29, and two vertical guide rods 32 slidably provided in the vertical direction at both ends of the upper and lower bridge members 26, 29.
A horizontal guide 36 that engages with the vertical guide rod 32 between the upper and lower bridge members and guides the vertical guide rod in the lateral direction, and a pair of upper and lower members arranged between the facing surfaces of the upper and lower bridge members 26, 29. A seal bar operating device comprising seal bars 37, 38 and a cushion spring 39 interposed between at least one of the frame members and the seal bar. 2. The cushion springs 39 and 40 are provided between the upper and lower bridge members 26 and 29 and the upper and lower seal bars 37 and 38, respectively.
Actuating device of the seal bar according to.