Sealing device

• US 5,722,215 A
• Filed: 03/01/1996
• Issued: 03/03/1998
• Est. Priority Date: 03/02/1995
• Status: Expired due to Term

• Current Assignee: Shoji Yuyama
• Original Assignee: Shoji Yuyama
• Inventors: Yuyama, Shoji
• Primary Examiner(s): MOON, DANIEL B
• Application Number:
  US08/609,831
• Time in Patent Office: 732 Days
• Field of Search: 53/66, 53/75, 53/374.2, 53/374.3, 53/374.4, 53/375.4, 53/376.2, 53/548, 53/550, 53/551, 53/552, 53/553, 53/554, 53/555, 53/562, 53/568, 156/324, 156/379.9, 156/380.1, 156/465, 156/466
• US Class Current: 53/374.4
• CPC Class Codes: B29C 2793/0045 Perforating
• CPC Class Codes: B29C 65/18 using heated tools
• CPC Class Codes: B29C 65/7437 the tool being a perforating tool perforating as mechanical pre-treatment B29C66/02242
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/3452 Making complete joints by combining partial joints
• CPC Class Codes: B29C 66/4312 for making flat seams in tubular or hollow articles, e.g. transversal seams
• CPC Class Codes: B29C 66/4322 by joining a single sheet to itself B29C66/4332 takes precedence
• CPC Class Codes: B29C 66/81422 being convex
• CPC Class Codes: B29C 66/8221 Scissor or lever mechanisms, i.e. involving a pivot point
• CPC Class Codes: B29C 66/8286 Hand placed clamps wrap-around tapes or bands B29C66/81471
• CPC Class Codes: B29C 66/83413 cooperating rollers, cylinders or drums
• CPC Class Codes: B29C 66/83513 cooperating jaws mounted on rollers, cylinders or drums and moving in a closed path
• CPC Class Codes: B29C 66/84121 of different width
• CPC Class Codes: B29C 66/849 Packaging machines
• CPC Class Codes: B29C 66/934 by controlling or regulating the speed
• CPC Class Codes: B65B 51/28 Rollers for producing longitudinal and transverse seams simultaneously
• CPC Class Codes: B65B 9/067 the web advancing continuously B65B9/08 takes precedence

Abstract

A sealing device which can form pouches with different widths, which is small in size, and which can minimize the waste of sheet material. To reduce the size of the device, a pair of second rotary shafts each carrying a longitudinal heating member having a cylindrical heating surface for feeding a two-folded packing sheet and sealing its side edges by coming into contact with the sheet are mounted on a pair of rotary shafts provided in the feed path of the sheet and each carrying a lateral heating member having an axial heating surface adapted to laterally contact the sheet and a surface not in contact with the sheet. To form a pouch from the sheet, the first rotary shafts are rotated by a first rotary drive unit to laterally seal the sheet by pressing the lateral heating members. Then, the side edges of the sheet are sealed by rotating the longitudinal heating members by rotating the second rotary shafts with a second rotary drive unit. By adjusting the feed distance of the sheet, it is possible to form pouches with different widths. With this arrangement, it is possible to form any narrow pouches. Thus, it is possible to minimize the waste of sheet material.

Claims

1. A sealing device comprising a pair of first rotary shafts provided in a feed path for a longitudinally two-folded, heat-fusible packing sheet and rotatably supported by bearings so as to extend perpendicular to the direction in which said packing sheet is fed, a pair of lateral heating members mounted on said respective first rotary shafts and each having an axially extending heating surface capable of contacting said sheet and a surface kept out of contact with said sheet, a pair of second rotary shafts rotatably mounted around said respective first rotary shafts through bearings, a pair of longitudinal heating members mounted on said respective second rotary shafts and each having a cylindrical heating surface adapted to contact both side edges of said sheet, a first rotary drive means for rotating said first rotary shafts, and a second rotary drive means for rotating said second rotary shafts.

2. A sealing device comprising a pair of first rotary shafts provided in a feed path for a two-folded, heat-fusible packing sheet and rotatably supported by bearings so as to extend perpendicular to the direction in which said packing sheet is fed, a pair of longitudinal heating members mounted on said respective first rotary shafts and each having a cylindrical heating surface adapted to contact both side edges of said sheet, a pair of second rotary shafts rotatably mounted around said respective first rotary shafts through bearings, a pair of lateral heating means mounted on said respective second rotary shafts and each having an axially extending heating surface capable of contacting said sheet and a surface kept out of contact with said sheet, a first rotary drive means for rotating said first rotary shafts, and a second rotary drive means for rotating said second rotary shafts.