JPS6233683Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in the heater mounting structure of a heat sealing device that welds and seals a thermoplastic packaging bag by sandwiching it between a pressure-bonding elastic body and a heater.

[Prior art]

Conventionally, in the heater of a heat sealing device that welds and seals a thermoplastic packaging bag by sandwiching it between a crimp elastic body and a heater, if the heater is loose, not only will the finish of the seal be poor, but it will also be pressed by the crimp elastic body. The heater cuts out when This slack in the heater can occur when the heater stretches due to the heat of the heater, so when installing the heater, it is necessary to take this stretch into account and pull the heater while installing it.

[Problem that the invention attempts to solve]

The above-mentioned conventional heater mounting structure has problems in that not only is it difficult to install the heater, but also that the tension applied to the heater is not constant, resulting in uneven heater life and poor maintainability.

This invention was made in view of the above points,
To provide a heater mounting structure with good heater mounting workability, constant life of the heater, and good maintainability.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides a sealing device that welds and seals a thermoplastic packaging bag by sandwiching it between a pressure-bonding elastic body and a heater mount, in which the heater mount is welded and sealed. A lever member that rotates in the longitudinal direction is pivoted,
A mounting part for fixing one end of the heater is provided at the end of the lever member on the heater mounting side, a cover covering the mounting part is pivotally supported to be able to open and close, and a link is provided to connect the cover and the lever member. The heater mounting structure was configured.

[Effect]

By configuring the heater mounting structure of the heat sealing device as described above, when the cover is opened, the heater mounting portion of the lever member rotates in the direction of loosening the heater via the link, making it easy to attach and detach the heater. Furthermore, when the cover is closed, the heater attachment part of the lever member rotates in the direction of pulling the heater through the link, so the amount of movement of the heater attachment part is always constant, and the tension applied to the heater is constant.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 and 2 are diagrams showing the overall configuration of a simple filling and packaging machine according to the present invention, with FIG. 1 being a side view and FIG. 2 being a front view.

The simple filling and packaging machine 10 supports a group of packaging bags A bound in the form of a book in its machine frame, pulls out one bag to the front of the machine frame, opens it with a blower 11, and uses a hopper 12 to remove the packaged items. At the same time, heat sealing and separation are performed using a heat sealing device 1 equipped with a separation mechanism.

The heat sealing device 1 is provided with a heater H along the width direction of the machine frame of the packaging machine 10, and a movable crimping elastic body 2. The heater H and the crimping elastic body 2 seal a packaging bag a. It is clamped and welded and sealed.

An example of a heater mounting structure will be described with reference to FIGS. 3 and 5, with respect to one end of the heater.

The heater H is mounted along the front end surface of a heater mount 3 arranged in the width direction of the machine frame at the front of the packaging machine 10. At the end of the heater mount 3, a protrusion 3c with a pivot 13 attached is provided,
Place the lever member 4. A mounting portion 4a for fixing one end of the heater H is provided at the end of the lever member 4 on the heater mounting side. The lever member 4 is connected to the central portion of the lever member 4 by the pivot shaft 13 so that the attachment portion 4a thereof is rotated in the longitudinal direction of the heater H to which it is attached.
It is rotatably supported on the shaft. A protective cover 6 that covers the end of the heater mount 3 provided with the lever member 4 is rotatably supported on the pivot 7 by attaching a pivot 7 to a protrusion 3b formed on the rear side 3a of the end. do. A protruding portion 6b is formed so as to extend the supporting portion 6a, to which the protective cover 6 is pivoted, toward the inside of the cover. The protrusion 6b and the rear end 4b of the lever member 4 are movably connected by a link 8. Lever member 4
The vicinity of the mounting portion 4a of the heater mount 3 and the rear end 3a of the heater mount 3 are stretched by a coil spring 5. The switch SW attached to the end of the heater mount 3 operates at the rear end 4b of the lever member 4, and cuts off the power to the heater H when the protective cover 6 is opened. A stopper 3d provided at the end of the heater mount 3 restricts the rotation of the lever member 4.

The operation of the above heater mounting structure will be explained. When installing the heater H, the protective cover 6 is rotated counterclockwise as shown in FIG. The end of the heater mounting base 3 is opened, and the lever member 4 is rotated clockwise by the link 8 connecting the protective cover 6 and the lever member 4, and comes into contact with the stopper 3d. to stop its rotation.
The lever member 4 maintains its state by the elastic action of the coil spring 5. Therefore, the position of the heater mounting portion 4a is shorter than the mounting interval of the heaters H. Since the end of the heater H is fixed to the attachment part of the lever member 4 in a relaxed state, the heater can be easily attached. When the installation of the heater H is completed, the protective cover 6 is rotated clockwise. The lever member 4 is rotated counterclockwise by the action of the link 8. For this reason, the heater H is stretched by a predetermined amount and becomes taut. When the protective cover 6 is in the closed state, the end of the heater mounting base 3 and the heater mounting portion 4a of the lever member 4 are hidden by the protective cover 6. Also, at this time, the lever member 4 operates the switch SW, so that the heater H can be energized. The coil spring 5 maintains this state due to its elasticity. In this state where the heater H can be energized, the mounting portion of the heater H is hidden by the cover 6, so it is safe because the heater H cannot be removed by mistake while the heater H is energized.

Next, the second embodiment will be explained with reference to FIGS. 6 to 9. This embodiment is an example in which the opening/closing direction is different from that of the first embodiment, and the protective cover 6' is opened upward. be. The protective cover 6' is provided so as to be openable and closable about a vertical shaft 7', and is linked to a lever member 4' having the same structure as in the first embodiment through a link 8'.

In the above embodiment, when the protective cover 6' is closed, the heater H becomes tense (FIGS. 6 and 7), and when the protective cover 6' is opened, the heater H is relaxed (FIGS. 8 and 9). In this embodiment, the protective cover 6' is closed by engagement of the edges of the protective cover 6', and tension is applied to the heater H.

Further, the link 8' is not limited to the above-mentioned bar material, but may be a link 9 made of a twisted plate material as shown in FIG.

It should be noted that the heater mounting structure of the present invention is not limited to the simple filling and packaging machine of the embodiment, but may be incorporated into a single heat sealing device or the like. Further, in the embodiment, one end of the heater mount has been described, but it is also possible to install the heater mount at both ends.

[Effect of idea]

As explained above, according to the present invention, in a sealing device that welds and seals a thermoplastic packaging bag by sandwiching it between a pressure-bonding elastic body and a heater mounting base, at least at one end of the heater mounting base, the longitudinal direction of the heater is A lever member that rotates in the direction is pivotally supported, a mounting part for fixing one end of the heater is provided at the end of the lever member on the heater mounting side, a cover covering the mounting part is pivotally supported so as to be able to open and close freely, and Since a link is provided to connect the cover and the lever member, when the heater is installed, when the protective cover is opened, the protective cover and the lever member are connected by the link, so that the heater attachment part of the lever member is connected to the heater longitudinal side. It rotates inward and becomes shorter than the heater installation dimension. Therefore, installation can be performed with the heater loosened. Furthermore, when the protective cover is closed, the heater mounting portion of the lever member rotates in the direction of pulling the heater to a predetermined position (outward in the longitudinal direction of the heater), so a constant tension is always applied to the heater and it is in a taut state. Therefore, the finish of the welded seal on the bag is good, and the lifespan of the heater is constant, which improves maintainability. Furthermore, since the heater mounting portion is covered by the protective cover when the protective cover is in the closed state, the heater cannot be easily removed and is therefore safe.

Furthermore, since the protective cover is always attached, excellent effects such as preventing loss of the protective cover can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view of a simple filling and packaging machine according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a partially cutaway plan view of the end of the heater mount, Fig. 4 is an explanatory diagram of the same operation, 5 is a cross-sectional view of FIG. 3, FIG. 6 is a partially cutaway plan view of the end of the heater mount of the second embodiment, FIG. 7 is a cross-sectional view of FIG. 6, and FIG. FIG. 6 is an explanatory diagram of the operation, FIG. 9 is a cross-sectional view taken from FIG. 8, and FIG. 10 is a diagram showing a modification of the link of the second embodiment. In the figure, 1...heat sealing device, 2...elastic body for crimping, 3...heater mount, 3a...rear end of heater mount, 3b...projection, 4...lever member, 4a... Heater mounting portion, 6...protective cover, 8...link, H...heater.

Claims (1)

[Scope of utility model registration request] In a sealing device that welds and seals a thermoplastic packaging bag by sandwiching it between a crimp elastic body and a heater mount, at least at one end of the heater mount,
A lever member that rotates in the longitudinal direction of the heater is pivotally supported, a mounting part for fixing one end of the heater is provided at the end of the lever member on the side where the heater is attached, and a cover covering the mounting part is pivoted so that it can be opened and closed freely. A heater mounting structure for a heat sealing device, characterized in that a link is provided to support and connect the cover and the lever member, and when the cover is closed, the lever member rotates in a direction to pull the heater.