JPH0215769Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the attachment of a seal for use in packaging machines or bag-making machines to heat-weld packaging materials. It is characterized in that the form of the seal can be freely changed in several ways.

(Prior Art) For example, when a bag is formed using a bag-making machine, several types of seals are required for the bag, such as a full-face seal, a full-face opening, and a dot seal. Japanese Patent Publication No. 58-22427 discloses a sealing device that can be freely and efficiently changed to the standard sealing configuration. This known technique consists of a pair of upper and lower L-shaped holders 1, 1, respectively, as shown in FIG.
Rotate 90 degrees and attach 4 seal bars 3, 4, 5, 6
By switching to selectively combine 4
Since it is possible to seal in the same way, it is superior in terms of efficiency compared to the previous method in which the seal bar was detached and replaced. However, the known technology
The holders 1, 1 can be used as a so-called "long seal" that moves in an elliptical orbit as shown by arrows 7, 7 along the flow direction of the packaging material 8, but it can also be used as a "rotating seal" as shown in FIG. 2, 2 cannot be used as a seal to rotate the holders 1, 1. Since the cycle speed of long seals is lower than that of rotary seals, the above-mentioned known techniques have the drawback of low efficiency.

(Problems to be Solved by the Invention) In view of the above points, it is an object of the present invention to provide a sealing device that can be used not only for rotary seals but also for long seals with good sealing efficiency.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cutting edge on one side surface of the fixed bar 21, which has a sealing surface 27 formed on the lower side, so that the cutting edge is substantially flush with the sealing surface. The cutting blade 23 is fixed with a plurality of embedded screws 33, 33 so that The set bolt 26 is passed through an elongated hole penetrating from the side surface of the movable bar 22 toward the fixed bar 21, and the movable bar 22 is slidable relative to the fixed bar 21 within the length of the elongated hole. While the movable bar 22 is fixed to the fixed bar 21 with the set bolt 26, pipe heaters 24 and 25 are provided inside each of the fixed bar 21 and the movable bar 22, and the seal bar 10 and the separate seal stand 11 are connected to each other. The packaging material is heat sealed.

(Function) When the fixed bar 21 and the movable bar 22 are fixed together and the packaging material is sealed so that the sealing surface 27 of the fixed bar and the sealing surface 28 of the movable bar are flush with each other, the gap between these two bars is The edges of the opening on both sides of the portion cut by the cutting blade 23 provided at the opening are completely sealed.

On the other hand, when the set bolts fixing the movable bar 22 to the fixed bar 21 are loosened and the movable bar 22 is moved, the sealing surfaces 2 on both sides of the cutting blade 23
7 and 28 are on different levels, and when the packaging material is sealed in a hanging state, one side of the cut portion is completely sealed and the other side is kept open.

(Example) In FIG. 1, 10 is a seal bar, 11 is a seal stand, both of which are fixed along the longitudinal direction of the side surfaces of the rotors 12, 12, and the shafts at both ends of the rotors are
The packaging material A, which is rotated by 3 and 13 and travels in the direction of the arrow, can be heat-sealed.

When the upper seal bar 10 is enlarged, a fixed bar 21 fixed to the rotor can be seen as shown in FIG.
, a movable bar 22 slidably attached to the side surface of the fixed bar, a cutting blade 23 provided between the two bars, and pipe heaters 24 and 25 embedded along the longitudinal direction within the two bars. , and a plurality of set bolts 26 extending from the movable bar 22 to the fixed bar 21. The heat generated from the pipe heaters 24 and 25 is transferred to the gently arcuate sealing surfaces 27 on the lower sides of the bars 21 and 22.
The heat is conducted to the sealing surface 28, and the packaging material is heat-sealed on this sealing surface.As shown in FIG.
It is formed by surfaces with 9 and 30. Further, as shown in FIG. 4, a part of the inner surface 31 of the fixed bar 21 is shaved off by the thickness of the cutting blade 23 to form a knife accommodating portion 32, so that the inner surface 31 and the side surface 23a of the cutting blade 23 are flush with each other. The cutter is housed in the cutter accommodating portion 32 in a uniform manner, and the cutting blade 23 is fixed to the fixing bar 21 with a screw 33. Fourth
In the figure, reference numeral 15 is a screw hole that engages the set bolt 26 of FIG. The movable bar 22 is the fourth
It slides along the side surfaces 31 and 23a of the fixed bar and the cutter shown in the figure, and the protrusion-shaped guide rail 34 bulging from the side surface 31 of the fixed bar is moved downward so as to hold the cutting blade 23. As shown in FIG. 3, a plurality of guide rails 34, 34...
A guide groove 3 formed on the inner surface of the movable bar 22
5, 35... are engaged to guide the movable bar 22. Furthermore, as can be understood by comparing FIG. 2 and FIG. 6, vertically opposed stop surfaces 36 and 37 are formed on the fixed bar 21 to ensure the lower limit of movement of the inverted L-shaped movable bar 22. are doing.

Thus, in FIG. 2, the movable bar 22 is lowered, and the sealing surfaces 27 and 28 on both sides of the cutting blade 23 are flush with each other. Therefore, when the seal bar 10 and the seal stand 11 below it apply clamping pressure to the packaging material, the packaging material is cut by the cutting blade 23, and the edges on both sides of the cut portion are attached to the sealing surfaces 27, 28. The entire surface is sealed. However, the sixth
When the movable bar 22 is moved upward and fixed at that position with the set bolts 26 as shown in the figure, the lower surface 27 of the fixed bar and the lower surfaces of the plurality of guide rails 34 are in contact with the packaging material, but the lower surface 28 of the movable bar is in contact with the packaging material. Do not touch. For this reason, as shown in FIG. 5, one end of the packaging material A is fully sealed 38 and the other end is spot sealed 39.
It is possible to make bags with Note that the spot seal 39 is performed by the lower surface of the guide rail 34 of the fixed bar.

The seal bar 10 shown in FIG. 2 can be used not only for the rotary type shown in FIG. 1 but also for a long seal that rotates on an elliptical orbit as shown in FIG.

FIG. 8 shows the movable bar 22 relative to the fixed bar 21.
This embodiment is provided with a spring 41 that pushes up the movable bar 22 and a threaded rod 42 that also serves as a stopper that pushes down the movable bar 22 against the spring 41. 9 and 10 show an embodiment in which the guide rail of the movable bar 22 is removed from the fixed bar 21. In this embodiment, the fixed bar 21 and the movable bar 22 are completely separated from each other with the cutting blade 23 as the boundary. Therefore, as shown in FIG. 11, a bag A with one end 42 completely sealed and the other end 43 completely open is used.
can be formed.

(Effects of the Invention) As explained in the above embodiment, the present invention allows the movable bar 22 to be slid freely on the inner surface of the fixed bar 21 for sealing packaging material, which has the cutting blade 23 in the cutter accommodating portion on the inner surface. Equipped and configured, movable bar 2
By changing the position of 2, it is possible to arbitrarily combine a full-face seal with a full-face seal, and a full-face seal with a point seal or an opening. Compared to conventional devices that are used only for general purpose purposes, compatible devices can be used not only for long seals but also for rotary seals, which has the effect of expanding the range of uses.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a partial sectional view of the front diagram, FIG. 3 is a bottom view of the front diagram, and FIG. 4 is a perspective view taken along the - line in the front diagram. FIG. 5 is an explanatory diagram of a packaged product, FIG. 6 is an explanatory diagram of the operation of FIG. 2, FIGS. 7 to 11 are explanatory diagrams of other embodiments, and FIG. 12 is an explanatory diagram of a conventional example. A... Packaging material, 10... Seal bar, 11... Seal stand, 21... Fixed bar, 22... Movable bar,
23... Cutting blade, 24, 25... Pipe heater,
26... Set bolt, 31... Inner surface, 32...
...Blade storage section, 34...Guide rail, 35...
guide groove.

Claims (1)

[Scope of utility model registration request] A plurality of embedded screws 33 are installed with cutting blades 23 on one side surface of the fixing bar 21 with a sealing surface 27 formed on the lower side so that the cutting edges are substantially flush with the sealing surface.
33, and a sealing surface 28 on the lower side of the fixing bar 21 through the cutting blade 23.
A movable bar 22 is arranged, and the movable bar 2
The set bolt 26 is passed through an elongated hole penetrating from the side surface of the movable bar 22 in the direction of the fixed bar 21, and the set bolt 26 is inserted so that the movable bar 22 can freely slide relative to the fixed bar 21 within the length of the elongated hole.
While fixing the movable bar 22 to the fixed bar 21,
A heating sealing device in which pipe heaters 24 and 25 are provided inside each of the fixed bar 21 and the movable bar 22, and the packaging material is heat-sealed using the sealing bar 10 and a separate sealing stand 11.