JPS6137612Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention heat-welds the overlapping parts of the packaging materials of products covered with packaging materials such as wrapping paper or synthetic resin films either directly or with an adhesive interposed between the overlapping parts. Regarding a heater to be sealed.

Conventional heaters for heat sealing have a single flat heating surface that comes into contact with the overlapping part (sealing part) of packaging materials, and because the entire heating surface is pressed into contact with the sealing part, the product surface of the sealing part is uneven. If the heating surface is heated, only a portion of the heating surface will come into close contact with the sealing portion, resulting in an incomplete seal, which may lead to peeling of the packaging material.

In view of the conventional drawbacks mentioned above, the present invention aims to provide a heater that can perform good sealing regardless of the shape of the product surface of the sealing part. The heating surface of the heater body faces the surface of the product conveyance path, and the heating surface is formed into a convex surface with the center portion in the longitudinal direction protruding most.

Embodiments of the present invention will be described below with reference to the drawings regarding a sealing device for a waistband portion.

In the figure, 1 is a product wrapped around the body, and 2 is a substrate whose upper surface serves as a conveyance path surface 2a on which the product 1 slides. In FIG. 1, it is transferred from the left to the right.

A rectangular opening is formed in the substrate 2, and a heater body 3 is inserted at an appropriate position in the opening along the long side direction of the opening.
are arranged, and an appropriate number of spanning plates 4, 4, . . . are installed so as to be parallel to the heater main body 3.

The spanning plates 4, 4... are constructed by cutting out both ends thereof so that their upper surfaces are flush with the conveyance path surface 2a of the substrate 2, and placing the cut portions on the step portions of the short sides of the openings. Ru.

In addition, the spanning plates 4, 4... can be attached and detached by fitting the dowels in the notches into the dowel holes in the short side steps of the opening of the board 2, and the spanning plates 4, 4... can also be interchanged. Nasu.

Further, the opening of the substrate 2 is covered with a Teflon sheet 5 from the upper surfaces of the connecting plates 4, 4, . . . and the heater body 3, so that the heater body 3 contacts the product 1 through the Teflon sheet 5.

One end of the Teflon sheet 5 is wrapped around a mounting rod 6 fixed to the back surface of the tip of the board 2, and the other end is routed from the opening edge of the board 2 to the back surface of the board 2, and is mounted by being biased by a spring 7. Wrap it around plate 8,
The tension of the spring 7 also makes it tense.

The heater body 3 has an elongated rectangular cross section, its upper surface forming a heating surface 3a which contacts the Teflon sheet 5, and has insertion holes 3b for inserting electric wire heaters 9 which heat the heater body 3 drilled in the longitudinal direction from the left and right sides.

The heating surface 3a is formed into a curved surface with a protruding central portion, and the curved surface is formed with different curved surfaces at the central portion and the left and right end portions.

Furthermore, a pair of attachment parts are screwed to the longitudinal side surfaces of the heater main body 3, and two connecting shafts 9a, 9 protrude outward in the longitudinal direction of the main body 3, respectively.
b, 9c, and 9d, and an arc-shaped retaining groove 10 is bored at the upper center of the surface.

The connecting shafts 9a, 9b, 9c, and 9d are connected to a movable base 11 movably provided below the board 2 via a pair of left and right parallel links, and an arm rod fixed to the movable base 11 is provided in the latching groove 10. The tip of the heater body 3 is loosely fitted to restrict movement of the heater body 3 in the longitudinal direction.

Each parallel link is composed of drive links 12a, 13a and driven links 12b, 13b, and the ends of the drive link 12a and the driven links 12b, 13b and the intermediate part of the drive link 13a are arranged in parallel on the movable base 11 so as to be freely rotatable. Rotating shaft 14, 14', 15, 1
5' and tension the spring 16 across the end of the drive link 13a and the movable base 11,
The end of the link 13a on the connecting shaft 9c side is biased to move upward.

The rotating shafts 14, 14', 15, 15' are arranged one above the other with their long and short axes aligned, and the rotating shaft 15 to which the drive link 13a is fixed has a
One end of the swing link 17 is fixed, and one end of the swing link 18 is fixed to the rotating shaft 14'.

The other ends of each of the swing links 17 and 18 are brought into sliding contact with cams 19a and 19b attached to the rotating shaft of a motor 19 fixed to the movable base 11, respectively, so that the swing links 17 and 18 swing as the motor 19 rotates. The respective drive links 12a and 13a swing up and down.

In addition, a movable base 11 is located in the middle of the swing link 18.
A spring 20 is stretched between the two, and the tension of the spring 20 urges the swinging end of the swinging link 18 to come into contact with the cam 19b.

The cams 19a and 19b are formed with their timings shifted by 180 degrees so that the vertical movements of the drive links 12a and 13a are reversed, and the heater body 3 swings in the longitudinal direction.

In addition, the through holes at the ends of the links 12a, 12b, 13a, 13b, into which the connecting shafts 9a, 9b, 9c, 9d are loosely fitted, are formed into curved surfaces with the minimum diameter at the center to prevent the swinging of the heater body 3. Make it smooth.

The movable table 11 has guide rails 2 fixedly arranged below the substrate 2 parallel to the direction in which the products 1 are transferred.
1, 21'.

The moving mechanism consists of one guide rail 21 consisting of a rack having a toothed surface on the lower surface, a pinion 22 that meshes with the rack provided on the movable base 11 side, and the pinion 22 protruding outward from the movable base 11. The operating shaft 2 is fixed to the rotatable operating shaft 23.
3, the movable base 11 moves to the guide rail 21,
21', and along with this, the heater body 3
moves back and forth in the product 1 transfer direction.

The heater main body 3, which comes into contact with the Teflon sheet 5, is swung by rotating the motor 19 of the movable base 11, and the contact portion between the heating surface 3a and the seal portion of the product 1 is successively heated by the heating surface 3a. moves from one side end to the other side end, and sealing of the body wrapping part is performed.

In the above embodiment, the heating surface 3 of the heater body 3
Although a is formed with three curved surfaces, it is not limited to this shape, and may be formed with one curved surface with the center part bulging out the most, but the center part is a horizontal plane and both left and right ends are downward as they go outward. It may be formed with inclined surfaces facing toward each other, as long as the central portion protrudes the most and the amount of protrusion gradually decreases toward both left and right ends.

Since the present invention is constructed as described above, regardless of the shape of the product surface on which the seal part of the package is located, it is possible to reliably seal the seal part, prevent peeling of the package, and provide a good packaging. I can do it.

Thus, the intended purpose can be achieved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing a sealing device using the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a right side view of the same, Fig. 4 is a sectional view taken along the - line in Fig. 2,
FIG. 5 is a sectional view taken along the - line in FIG. 1. In addition, 2a in the figure...conveyance road surface, 3... heater main body,
3a... Heating surface.

Claims (1)

[Scope of utility model registration request] A heater in which the heating surface of an elongated heater body that swings in the longitudinal direction faces the surface of a product conveyance path, and the heating surface is formed into a convex surface with the center portion in the longitudinal direction most protruding.