JPH0834403A - Packaging machine - Google Patents

Abstract

PURPOSE: To certainly seal a tubular packaging material in which an article is housed by extending a shield from a stripper bar to arrange the outer surface thereof so as to leave an interval from a shaft by an almost constant radius in a radial direction and providing a stripper member almost coinciding with the outer surface in shape to the inner surface of the shield. CONSTITUTION: A bag shield 30 is provided with an arcuate outer surface 31 having an almost constant radius with respect to a shaft 32 around which a lever 26 revolves. A recessed surface 32 almost coincides with a surface 31 in shape. Since the surface 31 has a radius extending from the shaft 32, a stripper bar 17 can be engaged with a bag member 15 at a position nearer to a sealing jaw 16. By forming the gag shield 30 into this shape, a bag can take a shape maximizing a utilizable vol. for an article but, in spite of this, it is ensured that the sealing jaw 16 becomes a length sufficient to be properly engaged with a bag member 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine, and more particularly to a packaging machine using a "stripper".

[0002]

BACKGROUND OF THE INVENTION The present invention is disclosed in U.S. Pat. No. 4,663,91.
The present invention relates to a packaging machine such as the packaging machine described in No. 7. The machine disclosed in this particular U.S. patent is provided with a stripper bar that removes product from the "seal" area and squeezes the packaging member to reduce the volume occupied by the packaged product. Has become. In addition, closure bars have also been used, resulting in a length of packaging that does not contain product therein and that the sealing jaws engage. The strip bar is attached to a rotary drive arm that rotates in both directions about laterally spaced parallel axes. Both arms rotate "continuously" in their respective angular directions.

The stripper bar described above moves along the bag member to squeeze the wrapping member and move the product out of the area of engagement with the sealing jaws. However, a flange that engages the bag member extends from the sealing jaw,
It is a disadvantage of strip bars that the jaws are moved away from the squeezed length of the bag member so that the bag member does not engage the sealing jaws. These known strip bars and associated shields or flanges have the disadvantage of further reducing the volume available for the product.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome or significantly improve the drawbacks mentioned above.

[0005]

SUMMARY OF THE INVENTION Disclosed herein is a stripper member for a stripping and sealing assembly of a packaging machine, each of the stripper members having a first pivoting movement about a pivot axis. A pair of spaced stripper levers having one end and a second end further from the associated first end and a stripper extending between the second ends. Is it integrally molded with the bar and stripper bar,
Alternatively, it comprises an arcuate bag shield attached to it, the shield comprising:
Extending from the bar 17, its outer surface 31 is radially spaced from said axis by a substantially constant radius, its inner surface being substantially conformal to said outer surface.

The present document further includes a product delivery head and a drive assembly for moving the bag member past the delivery head so that the product delivered from the head is contained within the tubular bag member. Disclosed is a stripping and sealing assembly for a rotary wrapping machine, the stripping and sealing assembly comprising a product delivery head and a bag member for moving the bag member past the delivery head. In a stripper and sealing assembly for a rotary wrapping machine comprising a drive assembly for allowing the product delivered from the device to fit within the tubular bag member, the delivery in the direction in which the bag member passes through the device. At a position downstream from the head, A pair of opposed seals and strippers located on opposite sides of the bag member that cooperate to seally close a portion of the bag member and squeeze it prior to sealing. Means, a pair of arm means for supporting one of the seal and stripper means, and a pair of substantially parallel rotary drive shafts, each arm means extending radially outward, each seal and stripper means comprising: The means are provided with a sealing jaw and a stripper bar,
Before the sealing jaws sealingly engage the bag member, the stripper bar cooperates to squeeze the bag member and the arm means are continuously driven in rotation through the shaft to move the bag member. Completely parallel to each other, in parallel, about parallel fixed axes spaced apart substantially transversely to each other, with a stripper and sealing means along the bag member before sealing of the bag member. The strip bar moves to squeeze the bag member, and the stripping and sealing assembly further pivotally attaches the stripper bar to its support arm means to allow relative movement between them about a pivot axis. It has a support for each stripper bar and is either fixed to each stripper bar or There is integrally formed, from which, substantially along an arc having a radius extending from the pivot axis of the support cooperating, extends at an angle, the stripper bar is engaged with the bag member, each stripper
A pair of bag shields are provided that extend away from each other in opposite directions from the bar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The accompanying drawings show a schematic of a portion 10 of a packaging machine. The packaging machine includes a pair of arms 11 which rotate about laterally spaced parallel axes 12 formed by spaced parallel shafts 13.
Is a rotating machine. The machine can be constructed according to US Pat. No. 4,663,917. The shaft 13 is fixed with respect to its position in the machine, but repeatedly makes 360 ° continuous rotation in both directions. The packaging machine loads the product 14 into a tubular bag member 15
It is equipped with a product delivery head that delivers the product toward the inside. The bag member 15 is, for example, US Pat. No. 4,91.
It is driven by the machine shown at 0,943. The machine also squeezes the bag members, seals the bag members and cuts each bag from the tubular material as the bags are formed.

The operation sequence is as follows. First, the tubular bag member 15 is driven past the product delivery head so that the product 14 is fed inside the tubular bag member 15. Next, a pair of cooperating stripper bars 17 (bars on each side of tubular bag member 15) squeeze the tubular bag member to reduce the volume occupied by product 14. This prepares the length 18 of the tubular bag member to engage the sealing jaws 16. A pair of tube closure bars 19 located above the stripper bars 17 engage the tubular bag member 15 to prevent product from entering the tubular length 18 of the tubular bag member 15. A sealing jaw 16 is provided between the stripper bar 17 and the closure bar 19 at this length 18
Engage with. One of the sealing jaws 16 is preferably provided with a knife in order to cut out the required length of the bag member to obtain the complete bag 20.

As will be appreciated, each section 10 includes an arm 11 and a stripper bar 17 and a closure bar 19. Arms 11 are located on opposite sides of the tubular bag member to cooperate to form a bag 20 that is separated.

The following description is for a single section 10 only. The shaft 13 of the part 10 is driven in the direction of the arrow 21. The arm 11 includes a pair of levers 22
Is installed, but only one is shown. The levers 22 are spaced apart in the direction of the shaft 12 and support the stripper bar 17 and the closing bar 19 between them.

Each lever 22 is attached to its associated arm 11 by a pivot pin 32. Each arm 11 is composed of two protrusions 24 extending from the shaft 13 in the radial direction. The protrusions 24 are arranged at intervals in the longitudinal direction of the shaft 13 and are provided with the sealing jaws 16 therebetween. The sealing jaw 16 includes a heat sealing member 25. Each lever 22 is fixed to the corresponding one of the protrusions 24.

Each lever 22 includes a stripper lever 2
6 is pivotally mounted and extends between a pair of levers 26 with which each stripper bar 17 is associated. The associated stripper levers 26 are substantially parallel and extend the same length. A closing lever 27 is also pivotably mounted on each lever 22 and a closing bar 19 extends between the closing lever pair 27. The stripper lever 26 is spring biased to move in the direction of arrow 28, while the closing lever 27 is spring biased to move in the direction of arrow 29.

In this embodiment, stripper bar 17
Is integrally molded with the bag shield 30 or the bag shield is attached to the stripper bar 17. The bag shield 30 is formed in an arc shape so as to extend beyond the bag member 15 and has a stripper bar 17.
Extends over the entire length of the Bag shield 30
Has an arcuate outer surface 31 of substantially constant radius with respect to an axis 32a about which the lever 26 pivots. Concave surface 32
And the shape of the surface 31 are almost the same, and the bag shield 30
Would substantially follow an arc having a radius extending from axis 32a. The surface 31 has a radius extending from the axis 32a so that the stripper bar 17 is
Bag member 1 at a position closer to the sealing jaw 16
5 can be engaged. By bending the surface 31 so that it has a substantially constant radius from the axis 32a, the sealing jaw 16 faces the bag member 15,
Undesired contact between the bag shield 30 and the sealing jaws 16 is prevented when moving away from it. Further, by shaping bag shield 30 as described above, bag 20 may be shaped to maximize the volume available for product 14, but nevertheless the sealing jaws. It is ensured that 16 is of sufficient length 18 to properly engage bag member 15.

As will be appreciated, in FIG. 2, the sealing jaw 16 is depicted in a position where it seals the bag member and cuts the bag member 15. In the case of FIG. 3, the sealing jaw 16 is drawn in the position before it has reached the position shown in FIG.

The above stripper bar 17 and bag
The shield 30 will be described in more detail. In this example,
The stripper bar 17 and the bag shield 30 are integrally molded to form a stripper member 33. The stripper member 33 includes a leading edge portion forming the stripper bar 17, from which the bag shield 30 extends rearwardly and is integrally molded therewith. Two shafts 34 extend laterally that allow the stripper member 33 to be pivotally mounted to the end of the lever 26.

[Brief description of drawings]

FIG. 1 is a schematic side view of a portion of a bag member that is torn off, sealed, and cut away.

FIG. 2 is a schematic side view of a portion of a packaging machine that performs the functions outlined in FIG.

FIG. 3 is a schematic side view of a portion of the packaging machine shown in FIG.

4 is a schematic front view of the stripper bar and bag shield of FIGS. 1, 2, and 3. FIG.

5 is a schematic side view of the stripper bar and bag shield shown in FIG.

[Explanation of symbols]

 10 Packaging Machine 11 Arm 13 Shaft 14 Product 15 Bag Member 16 Sealing Jaw 17 Stripper Bar 19 Closure Bar 20 Bag 22 Lever 24 Protrusion 25 Heat Seal Member 26 Stripper Lever 27 Closing Lever 30 Bag Shield 31 Outer Surface 32 Pivot・ Pin 33 Stripper member

Claims (2)

[Claims] 1. A first end for pivoting a stripper member (33) about a pivot axis, respectively, further comprising:
A pair of spaced stripper levers (26) having a second end spaced apart from the first end and a stripper bar (17) extending between the second ends. )
And an arcuate bag shield (3) integrally molded with or attached to the stripper bar (17).
0), the shield (30) extending from the strip bar (17), the outer surface (31) thereof being radially spaced from the axis by a substantially constant radius. A stripper member (33) for a stripping and sealing assembly of a packaging machine, characterized in that its inner surface (32) substantially conforms to said outer surface (31). 2. A rotatable packaging comprising a product delivery head and a drive assembly for moving the bag member past the delivery head so that the product delivered from the head is contained within the tubular bag member. In a stripper and sealing assembly for a device, arranged on both sides of said bag member in cooperation with said bag member (15) in a direction downstream of said delivery head in a direction passing through said device, and in cooperation with each other, A pair of opposed seal and stripper means (16, 17) for sealingly closing a portion of the bag member (15) and squeezing it prior to sealing; A pair of arm means (11) for supporting one of the stripper means and an arm means (11) on the outer side in the radial direction. A sealing jaw (2) to each seal and stripper means.
5) and a stripper bar (17) are provided,
The stripper bar (17) before the sealing jaws (25) sealingly engage the bag member (15).
Cooperate with each other to squeeze the bag member (15), and the arm means (11) is continuously rotatably driven via the shaft (13) so that the arm member (11) is spaced substantially transverse to the moving direction of the bag member (15). Fully parallel in both directions about parallel fixed axes arranged with a gap between them, the stripper and sealing means moving along said bag member (15) before sealing of said bag member (15). Strip
The bar (17) irons the bag members and the stripping and sealing assembly further pivotally mounts the stripper bar (17) on its support arm means (11) for relative movement between them about a pivot axis. With a support (26) for each stripper bar (17), each further comprising a stripper
The stripper is fixed or otherwise integrally molded to each of the bars (17) and extends at an angle from there substantially along an arc having a radius extending from the pivot axis of the associated support (26). A pair of bag shields (30) are provided which, when the bars (17) engage the bag member (15), will extend away from each other in opposite directions from the respective stripper bars (17). A stripping and sealing assembly.