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Packaging machine

a packaging machine and a technology of a packing machine, applied in the field of packaging machines, can solve the problems of film cannot be cut through with the conventional melting-type cutting devices, and the pressing member must be pressed into the receiving member with a relatively large amount of force, so as to achieve the effect of large pressure, fast and precise cutting of bags, and large cutting pressur

Inactive Publication Date: 2008-03-27
ISHIDA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a packaging machine that can selectively seal and cut cylindrical packing material. The machine includes a pair of sealing members, a cutting device, a switching unit, and a stopping unit. The cutting device includes a pressing member and a receiving member, and the pressing member can selectively press the receiving member to cut the packing material. The switching unit can switch the pressing member between a pressing state and a non-pressing state with respect to the receiving member. The stopping unit stops the pressing member from retracting. The machine can switch between cutting and not cutting the bags based on the sealing members being pressed together. The force augmenting mechanism used in the machine can be a toggling mechanism or a cam mechanism, and the machine can adjust the pressing force based on various factors. The machine is designed to maintain a large amount of pressure necessary for cutting for a long period of time, ensuring reliable and firm sealing of the packing material.

Problems solved by technology

However, with melting-type cutting devices such as those described above, since the film is melted with heat and cut through with pressure, the pressing member must be pressed into the receiving member with a relatively large amount of force.
However, the result of this is that a conventional melting-type cutting device has drawbacks in that it is constantly cutting bags and cannot switch back and forth from a cutting to a non-cutting mode.
However, with the cutter device disclosed in Japanese Examined Utility Model Application No. 61-43687, when either a cutting blade or a perforating blade is used, there is no support for bearing the large amount of force applied from the front of the blade, and therefore the blade retracts, and the film cannot be cut through with the large amount of force applied.
In addition, in the packaging machine disclosed in Japanese Patent No. 2849071, when perforating needles configured to be capable of oscillating by means of a parallel link move forward past the sealing surface of a seal bar, there is no support for bearing the large amount of force applied from the front of the needles, and therefore the needles retract, and the film cannot be cut through with the large amount of force applied.
With the cutting device disclosed in Japanese Examined Utility Model Application No. 7-51454, when perforations are created or when the bags are cut apart from each other, the knife is constantly piercing through the bags, and therefore keeping the pressing member from being pushed into the receiving member is not an option.
Although it is possible for a cylinder or another such drive source for driving the pressing member to bear this large amount of pressure during melting, this will require a large and heavy drive source, and will result an increase in the cost of the cutting device and compromise the speed of the packaging machine.

Method used

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Experimental program
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first embodiment

[0036] In this embodiment, the present invention is applied to a packaging machine 1 shown in FIG. 1. Specifically, this packaging machine 1 is a conventional lengthwise pillow-type bag making machine, comprising a former 2, a tube 3, pull-down belts 4, 4 (only one is shown), a lengthwise sealing device 5, and a widthwise sealing device 6. A heat-melting film F made of a synthetic resin or the like is conveyed as shown by the arrow, and rolled into a cylinder by the former 2. The cylindrical film F is suspended down along the periphery of the tube 3, and as the film is conveyed further downward by the pull-down belts 4, 4, the overlapping lateral edges of the film are sealed along the length thereof by being heated and welded by the lengthwise sealing device 5, and the film is further sealed along the width thereof by being heated and welded by the widthwise sealing device 6. While the bag W is thereby being manufactured, articles are filled into the bag W from above via the tube 3....

second embodiment

[0052] A second embodiment of the present invention will be described with reference to FIGS. 6 and 7. The same reference numbers are used for structural elements identical to or resembling those of the first embodiment, and only the characteristics unique to this embodiment are described below. In the first embodiment, a toggling mechanism was used as the force augmenting mechanism for transmitting the motive energy of the air cylinder 30 to the pressing member 22; however, in the second embodiment, a cam mechanism is used as the force augmenting mechanism.

[0053] In the second embodiment, a widthwise sealing device 6 has sealing jaw units. Two of these jaw units come in contact and sandwich the film F, where the pressing members 22 are provided on the first jaws 11 and the receiving members 23 are provided on the second jaws 12. However, only a jaw unit of the first jaws 11 is described below as an example, shown in FIG. 6.

[0054] Specifically, this jaw unit includes two bearings ...

third embodiment

[0067] A third embodiment of the present invention will be described with reference to FIG. 8. The same reference numbers will be used to denote structural elements identical or similar to those in the first and second embodiments, and only the characteristics unique to the third embodiment will be described. In the first and second embodiments, the toggling mechanism or the cam mechanism were used as the force augmenting mechanism, as the stopping unit for stopping the pressing members 22 from behind when the pressing members 22 were in contact under pressure, i.e., when the bags W were being cut; however, in the third embodiment, a mobile member is used.

[0068] As shown in FIG. 8, the sealing jaw unit has a unit case 81 through which runs a shaft, shown by the two-dot chain line, that serves as a rotational axis X. An air cylinder 84 is housed in this case 81, and a bracket 86 is connected to the rod end 85 thereof. The bracket 86 extends past the opening 83 formed in a dividing p...

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Abstract

A packaging machine includes a pair of sealing members, a cutting device and a switching unit. The sealing members are configured to selectively seal a cylindrical packing material that extends therebetween. The cutting device includes a pressing member arranged on one of the pair of sealing members and a receiving member arranged on the other of the pair of sealing members. The cutting device is configured to selectively press the pressing member against the receiving member to melt and cut the cylindrical packaging material by heat and pressure. The switching unit is configured to switch the pressing member between a pressing state and a non-pressing state with respect to the receiving member when the sealing members are pressed together. The stopping unit is configured to selectively stop the pressing member from retracting from the pressing state with respect to the receiving member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional application of U.S. patent application Ser. No. 11 / 279,249, filed on Apr. 11, 2006. The entire disclosure of U.S. patent application Ser. No. 11 / 279,249 is hereby incorporated herein by reference. Moreover, this application claims priority to Japanese Patent Application No. 2005-113290. The entire disclosure of Japanese Patent Application No. 2005-113290 is hereby incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a packaging machine, and more particularly to packaging machines that have a cutting device installed on a sealing device. [0004] 2. Background Information [0005] In conventional practice, packaging machines generally form bags, into which articles are placed, by sealing a heat-melting film rolled into a cylinder lengthwise and widthwise, where the heat-melting film is made of a material such as a synthetic resin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65B7/02B65B51/10
CPCB65B61/08B65B51/306B29C65/18B29C65/305B29C65/7451B29C66/1122B29C66/232B29C66/4312B29C66/81419B29C66/81431B29C66/81435B29C66/8161B29C66/8221B29C66/8242B29C66/83513B29C66/83543B29C66/849B29C66/92443B29C66/92921
Inventor HASHIMOTOKONDO, MASASHIICHIKAWA, MAKATO
Owner ISHIDA CO LTD