Bag making machine and bag making method

Patent metadata

Field	Value
Publication number	US-11731387-B2
Application number	US-202017621887-A
Country	US
Kind code	B2
Filing date	Jul 3, 2020
Priority date	Jul 5, 2019
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

The present invention is a bag making machine ( 20, 30 ). The bag making machine ( 20, 30 ) includes: a conveying unit ( 37 ) which conveys a multi-layer film (S) in which films ( 13 a, 13 b ) are overlapped; a side edge sealing device ( 27 ) which thermally fuses the films ( 13 a, 13 b ) to each other; and an ultrasonic device ( 26 ) which crushes a part of a zipper member ( 14 ) disposed between films ( 13 a, 13 b ). The side edge sealing device ( 27 ) includes: a platform ( 44 ); and a heat-generating head ( 45 ). The ultrasonic device ( 26 ) includes: an anvil ( 41 ); and an ultrasonic horn head ( 42 ). The heating-generating head ( 45 ) and the ultrasonic horn head ( 42 ) reciprocate at a same cycle via a link member ( 51 ).

First claim

The invention claimed is:

1. A bag making machine comprising:
a conveying unit which conveys a multi-layer film in which strip-shaped films are overlapped;
a side edge sealing device which thermally fuses the films to each other at predetermined intervals in a width direction that is perpendicular to a conveying direction of the multi-layer film; and
an ultrasonic device which is disposed on an upstream side of the side edge sealing device in the conveying direction and softens and crushes a part of a zipper member with ultrasonic waves, the zipper member disposed between the films such that a longitudinal direction follows the conveying direction,
wherein the side edge sealing device includes:
a platform which supports the multi-layer film, and
a heat-generating head which reciprocates between a position adjacent to the multi-layer film and a position separated from the multi-layer film,

the ultrasonic device includes:
an anvil which supports the multi-layer film, and
an ultrasonic horn head which reciprocates between a position adjacent to the multi-layer film and a position separated from the multi-layer film, and

the heat-generating head and the ultrasonic horn head reciprocate at a same cycle via a link member common to the heat-generating head and the ultrasonic horn.

2. The bag making machine according to claim 1 , wherein the link member is connected to a single rotating device and a cam mechanism.

3. The bag making machine according to claim 1 , wherein the ultrasonic horn head is urged toward the multi-layer film by a spring.

4. The bag making machine according to claim 1 , further comprising:
a punching device which is disposed on a downstream side of the side edge sealing device in the conveying direction and punches a part of the multi-layer film,
wherein the punching device includes:
a female blade which supports the multi-layer film, and
a male blade which reciprocates between a position at which the male blade is fitted into the female blade and in which the male blade punches a part of the multi-layer film and a position separated from the multi-layer film, and which punches the part of the multi-layer film, and

the heat-generating head, the ultrasonic horn head, and the male blade reciprocate at the same cycle via the link member.

5. A bag-making method using the bag making machine according to claim 1 , the method comprising at least:
placing the zipper member between the films such that the longitudinal direction follows the conveying direction;
softening and crushing both end portions of the zipper member with ultrasonic waves; and
thermally fusing the films at predetermined intervals in the width direction.

Assignees

• Hosokawa Yoko Kk

Inventors

• Nobe Shintaro
• Umenaka Kazuhiro

Classifications

• B31B70/8131 Primary

  Making bags having interengaging closure elements · CPC title

• B31B70/645

  Making seals transversally to the direction of movement · CPC title

• B31B2160/102

  obtained from essentially rectangular sheets · CPC title

• B31B2170/20

  having multi-layered walls, e.g. laminated or lined · CPC title

• B31B70/8133 Primary

  Applying the closure elements in the cross direction · CPC title