JP2012086874A - Packaging machine former - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging machine former that can stably bond a ridge line part between a cylindrical part and a sailer part, form the ridge line with high accuracy and maintain the line over a long period of time.SOLUTION: The packaging machine former 1 includes the cylindrical part 2 and the sailer part 3 extending obliquely downward like a shoulder from an upper end of the cylindrical part 2, wherein a notch 21 is formed outside the upper end of the cylindrical part 2, while an inner end of the sailer part 3 is engaged with the notch 21 so that an upper end surface 22 on the inside of the upper end of the cylindrical part 2 and an upper surface 33 of the sailer part 3 are flush with each other, and the upper end of the cylindrical part 2 and the inner end of the sailer part 3 are peripherally bond.

Description

  The present invention relates to a former for a packaging machine used in a packaging machine for packaging an article.

  As a member used for a packaging machine for packaging an article, a former that forms a film to be a packaging bag into a cylindrical shape is known.

  For example, as disclosed in Patent Documents 1 and 2, this former is composed of a cylinder part and a sailor part that extends in a shoulder shape obliquely downward from the upper end of the cylinder part. A guide tube is disposed in the tube portion. And the sent film is sent along the curved surface of the sailor part, and the film is folded at an acute angle from the ridge line part between the sailor part and the cylindrical part between the cylindrical part and the guide cylinder, and the film is formed into a cylindrical shape. .

  Thereafter, the film rolled into a cylindrical shape is sealed in the vertical direction so as to bond both edges, and is also sealed in the horizontal direction so as to form the bottom of the packaging bag.

JP 7-315313 A JP-A-8-324505

By the way, in a former for a packaging machine, in order to accurately roll a film into a cylindrical shape, a high precision is required for the ridge line portion between the cylindrical portion and the sailor portion, so that it may be formed by casting. Forming the former is very expensive to manufacture. In casting, due to its nature, it is impossible to make the thickness less than a predetermined thickness, which hinders weight reduction of the former.

Therefore, it is desirable to form a separate cylindrical part and sailor part formed by bending which can reduce the weight of the former without any limitation on the thickness of the former by welding or the like. High accuracy is required for the ridge portion between the sailor and the sailor portion, and it is necessary to maintain it, so that it is required to stabilize the joining state.

  This invention proposes in view of the said subject, Comprising: The ridgeline part of a cylinder part and a sailor part can be joined stably, a ridgeline part is formed with high precision, and it is made over a long period of time. An object is to provide a former for a packaging machine that can be maintained.

The former for a packaging machine according to the present invention includes a tubular portion and a sailor portion extending in a shoulder shape obliquely downward from the upper end of the tubular portion, forming a notch on the outer upper end of the tubular portion, and inside the upper end of the tubular portion The inner end of the sailor portion is engaged with the notch so that the upper end surface of the sailor portion and the upper surface of the sailor portion are flush with each other, and the upper end of the tubular portion and the inner end of the sailor portion are joined circumferentially. It is characterized by doing.
According to this configuration, it is possible to stably join the ridge line part between the cylinder part and the sailor part in the engaged state, and the ridge line part can be formed with high accuracy and maintained for a long period of time. it can.

The former for a packaging machine includes a cylinder part and a sailor part extending in a shoulder shape obliquely downward from an upper end of the cylinder part, and a notch is formed below the inner end of the sailor part, The upper end of the cylindrical portion is engaged with the notch so that the inner end surface on the upper end and the inner surface of the cylindrical portion are flush with each other, and the upper end of the cylindrical portion and the inner end of the sailor portion are circumferential. It is characterized by joining.
According to this configuration, it is possible to stably join the ridge line part between the cylinder part and the sailor part in the engaged state, and the ridge line part can be formed with high accuracy and maintained for a long period of time. it can.

The former for a packaging machine according to the present invention is characterized in that a fitting portion in which the cylindrical portion and the sailor portion are fitted with unevenness is provided at a plurality of locations where the cylindrical portion and the sailor portion are joined. .
According to this configuration, the cylindrical portion and the sailor portion can be easily positioned, and the fitting portion prevents the sailor portion cylindrical portion and the sailor portion from rotating in the circumferential direction of the cylindrical portion. The joining state with the sailor can be further stabilized.

The former for a packaging machine according to the present invention is characterized in that the sailor part is formed by bending with a stepped curvature.
According to this configuration, it is possible to simplify the processing step when forming the sailor part, and it is possible to reliably prevent the springback and stabilize the shape of the sailor part. In addition, a wide variety of films can be formed into a cylindrical shape.

The former for a packaging machine according to the present invention is characterized in that a long hole extending in the longitudinal direction of the cylindrical portion is formed in the vicinity of both side end portions that are close to or in contact with the cylindrical portion.
According to this configuration, it is possible to reduce the rigidity of both end portions of the cylindrical portion and improve the accuracy of the roundness of the cylindrical portion.

  The former for a packaging machine according to the present invention can stably join the ridge line portion between the cylinder portion and the sailor portion in an engaged state, and forms the ridge line portion with high accuracy and maintains it for a long period of time. can do.

The perspective view of the former for packaging machines of the embodiment by the present invention. The front view of the former for packaging machines of the embodiment by the present invention. The AA sectional view taken on the line of the former for packaging machines of FIG. The elements on larger scale with respect to the ridgeline part X part of the cylinder part and sailor part of FIG. The partial enlarged plan view of the former | foamer for packaging machines of embodiment by this invention. (A) is a sectional view taken along line B-B of the former for packaging machine of FIG. 2, (b) is a sectional view taken along line B-B showing a state of being bent at a curvature radius R1 of the former for packaging machine of FIG. c) is a cross-sectional view taken along the line BB of the packaging machine former shown in FIG. 2 with a radius of curvature R2, and (d) is a state bent with the radius of curvature R3 of the packaging machine former shown in FIG. BB sectional drawing which shows this. The CC sectional view taken on the line of the cylinder part in the former for packaging machines of FIG. Sectional drawing equivalent to the AA sectional view of FIG. 1 in the former for packaging machines of the modification by this invention.

[Former for packaging machine of embodiment]
A former for a packaging machine according to an embodiment of the present invention will be described. FIGS. 1-7 is a figure which shows the former | foamer for packaging machines and its each part of embodiment.

  As shown in FIGS. 1 to 7, the former 1 for a packaging machine according to the present embodiment has a substantially cylindrical tube portion 2 and a shoulder shape extending obliquely downward from the upper end of the tube portion 2 and has a curved surface shape. The sailor part 3 and the plate 4 provided on the outer periphery of the cylinder part 2 and fixed to the outer periphery of the cylinder part 2 and the lower end 31 on the back side of the sailor part 3 which is lowered to the shoulder shape by welding or screwing. .

  As shown in FIG. 3, the cylindrical portion 2 is formed with a notch 21 on the outer side of the upper end, and the notch 21 is formed in a circumferential shape along the cylindrical portion 2. The inner end 32 of the sailor part 3 is engaged with the notch 21, and the upper end surface 22 inside the upper end of the cylinder part 2 and the upper surface 33 of the sailor part 3 are engaged with each other. The upper end of the cylinder part 2 and the inner end of the sailor part 3 are joined circumferentially along the upper end of the cylinder part 2 that opens obliquely. In this example, the notch 21 and the inner end 32 of the sailor part 3 are in contact with each other. The parts are joined by welding such as laser welding.

  As shown in FIG. 4, as shown in FIG. 4, fitting portions where the tubular portion 2 and the sailor portion 3 are fitted with projections and depressions are provided at a plurality of locations of the joining portion that is the ridge line portion between the tubular portion 2 and the sailor portion 3. The fitting portion of this example includes a concave portion 23 having a semicircular arc shape in plan view formed at the upper end of the cylindrical portion 2 and an outline in plan view protruding outward toward the upper end of the cylindrical portion 2 at the inner end of the sailor portion 3. It consists of a semicircular arc shaped convex portion 34, and the concave portion 23 and the convex portion 34 are fitted. The fitting part comprised from the recessed part 23 and the convex part 34 is spaced apart, is formed in multiple places, such as 1-4 places along the cylinder part 2, and it fits. As shown in FIG. 5, in this example, the fitting portions are spaced apart and formed at three locations. In addition, about the formation of a fitting part, unlike this example shown in FIG. 4, a convex part may be formed in the cylinder part 2, and a recessed part may be formed in the sailor part 3. FIG.

The sailor part 3 is formed by bending with a stepped curvature. In the cross-sectional locations shown in FIGS. 6A to 6D, bending is performed with stepped radii of R1, R2, and R3. To be formed. Here, the bending process related to the sailor unit 3 shown in FIGS. 6B to 6D may be performed at a time or may be sequentially performed for each radius of curvature. In this example, the radius of curvature is: curvature radius R3> curvature radius R2> curvature radius R1. The sizes of the curvature radii R1, R2, and R3 can be freely set.

  Further, the cylindrical portion 2 is formed so as to bend the plate material into a cylindrical shape so that both side end portions approach or come into contact with each other, and is inserted into the through hole of the plate 4 and fixed. As shown in FIGS. 2 and 7, long holes 25 and 25 extending in the longitudinal direction of the cylindrical portion 2 are formed in the vicinity of both side end portions 24 and 24 of the cylindrical portion 2, respectively.

  The former 1 for a packaging machine according to the present embodiment can stably join the ridge line portion between the tubular portion 2 and the sailor portion 3 in the engaged state by the engagement of the inner end 32 of the sailor portion 3 with the notch 21. It is possible to form the ridge line portion with high accuracy and maintain it for a long time.

  By forming a plurality of fitting portions each including the concave portion 23 and the convex portion 34 in the cylindrical portion 2 and the sailor portion 3, when the sailor portion 3 is engaged with the cylindrical portion 2, both can be easily positioned. Become. By forming three fitting portions, the positioning of the both becomes more reliable and easy. Moreover, it is prevented by the recessed part 23 and the convex part 34 that the cylinder part 2 and the sailor part 3 rotate in the circumferential direction of the cylinder part 2, and the joining state of the cylinder part 2 and the sailor part 3 is further stabilized. Can do.

By forming the sailor part 3 by bending with a stepwise curvature, the shape of the sailor part 3 after molding can be stabilized. That is, by forming the sailor part 3 by bending at a stepped curvature, plastic deformation occurs at the boundary between different radii of curvature, thereby suppressing the spring back and stabilizing the shape of the sailor part 3. Is possible. Further, when the sailor 3 is bent with a stepped curvature, the radius of curvature of the bending can be reduced as compared with the case of bending with a single curvature. Can be reduced, and the bending accuracy is improved. Moreover, it becomes possible to manufacture various sailor parts 3 adapted to a wide variety of films by freely combining molds having stepped radii of curvature. In other words, there is no need to manufacture a mold for each type of film, the mold can be generalized, and the manufacturing cost of the former for a packaging machine can be reduced.

  Due to the long holes 25 extending in the longitudinal direction of the cylindrical portion 2, the rigidity of the side end portions 24, 24 of the cylindrical portion 2 is reduced, and the outer side of the cylindrical portion 2 outside the side end portions 24, 24 shown by the two-dot chain line in FIG. The accuracy of the roundness of the cylindrical portion 2 can be improved by suppressing the splash. In other words, since the reaction force generated by the bending process of the cylindrical portion 2 is released by the long hole 25 of the cylindrical portion 2, the spring back at the side end portions 24, 24 of the cylindrical portion 2 is prevented, and the roundness of the cylindrical portion 2 is prevented. Accuracy is improved.

[Modifications of Embodiment, etc.]
In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification within the applicable range, or these Including those specified by adding other configurations disclosed in this specification, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained, These modifications are also included.

  For example, in the above embodiment, the notch 21 is formed outside the upper end of the cylindrical part 2, and the sailor part is formed in the notch 21 so that the upper end surface 22 inside the upper end of the cylindrical part 2 and the upper surface 33 of the sailor part 3 are flush with each other. 3, the inner end of the sailor 3 is joined and joined, but as shown in FIG. 8, a notch 35 is formed on the lower side of the inner end of the sailor 3, The upper end of the cylindrical portion 3 is engaged with the notch 35 so that the inner surface 26 of the cylindrical portion 3 is flush with the inner end 26 of the cylindrical portion 3, and the upper end of the cylindrical portion 2 and the inner end of the sailor portion 3 are joined circumferentially by laser welding or the like. It is also possible to adopt a configuration.

  Further, in the packaging machine former 1a of the modified example of FIG. 8, a concave portion or a convex portion is provided in the cylindrical portion 2 and a concave portion or a convex portion is provided in the sailor portion 3 at a plurality of joint portions of the cylindrical portion 2 and the sailor portion 3. It is good also as a structure which forms and provides the fitting part by which the cylinder part 2 and the sailor part 3 are fitted by an unevenness | corrugation. In addition, a configuration in which the sailor part 3 is formed by bending with a stepped curvature, or a long hole 25 extending in the longitudinal direction of the cylindrical part 2 is provided in the vicinity of the side parts 24 and 24 that are close to or in contact with the cylindrical part 2. A structure to be formed or a structure in which these are appropriately combined may be used.

  Further, the concavo-convex portions formed in the tube portion 2 and the sailor portion 3 can be formed in a triangular shape in a plan view in addition to a substantially semicircular shape in a plan view.

The cylindrical portion 2 may have an appropriate cylindrical shape other than the substantially cylindrical shape in which the side end portions 24 and 24 abut each other or the substantially cylindrical shape in which the side end portions 24 and 24 are close to each other. For example, the upper end of the cylindrical portion 2 that engages with the sailor portion 3 is a polygonal cylindrical shape such as a square cylindrical shape or a hexagonal cylindrical shape, and is formed into a substantially cylindrical shape that is gradually separated toward the lower end of the cylindrical portion 2. Is also possible. In this case, it is not necessary to join the sailor part 3 circumferentially along the upper end of the cylindrical part 2, and only the corner part at the upper end of the cylindrical part 2 may be joined to the sailor part 3. In addition, it is also possible to set it as polygonal cylinder shapes, such as a square cylinder shape and a hexagonal cylinder shape, without changing the cylinder part 2 gradually.

Moreover, it replaces with the structure which forms a notch in the upper end of the cylinder part 2 of the said embodiment, or the inner periphery of the sailor part 3, and is notched in the upper end of the cylinder part 2, or a part of inner end of the sailor part 3. For example, a configuration in which a fitting portion that is fitted with unevenness is provided is also included in the invention disclosed in this specification. The configuration in which a notch is formed in the upper end of the cylindrical portion 2 or a part of the inner end of the sailor portion 3 is formed by bending the sailor portion 3 with a stepped curvature, or both end portions 24 of the cylindrical portion 2. It is also possible to form a long hole 25 extending in the longitudinal direction of the cylindrical portion 2 in the vicinity of 24.

  The present invention can be used as a former for a packaging machine used in a packaging machine for packaging an article.

DESCRIPTION OF SYMBOLS 1, 1a ... Former for packaging machines 2 ... Cylindrical part 21 ... Notch 22 ... Upper end surface 23 ... Convex part 24 ... Side end part 25 ... Long hole 26 ... Inner surface 3 ... Sailor part 31 ... Lower end 32 ... Inner end 33 ... Upper surface 34 ... concave part 35 ... notch 36 ... inner end face 4 ... plate R1, R2, R3 ... radius of curvature when bending sailor part

Claims (5)

A tube part;
A sailor portion extending obliquely downward from the upper end of the tubular portion,
Forming a notch on the outside of the upper end of the cylindrical portion,
Engage the inner end of the sailor part with the notch so that the upper end surface inside the upper end of the tube part and the upper surface of the sailor part are flush with each other,
A former for a packaging machine, wherein an upper end of the cylindrical portion and an inner end of the sailor portion are joined in a circumferential shape. A tube part;
A sailor portion extending obliquely downward from the upper end of the tubular portion,
Forming a notch below the inner end of the sailor,
Engage the upper end of the tube portion with the notch so that the inner end surface on the inner end upper side of the sailor portion and the inner surface of the tube portion are flush with each other,
A former for a packaging machine, wherein an upper end of the cylindrical portion and an inner end of the sailor portion are joined in a circumferential shape.   The packaging machine according to claim 1 or 2, wherein fitting portions are provided at a plurality of locations where the cylindrical portion and the sailor portion are joined to each other so that the cylindrical portion and the sailor portion are fitted with unevenness. Former.   The former for a packaging machine according to any one of claims 1 to 3, wherein the sailor part is formed by bending with a stepwise curvature.   The former for a packaging machine according to any one of claims 1 to 4, wherein a long hole extending in a longitudinal direction of the cylindrical portion is formed in the vicinity of both side end portions adjacent to or in contact with the cylindrical portion. .

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