JPS6112812B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a rotary type packaging machine for welding and sealing a packaging tube formed of a thermoplastic synthetic resin film to a predetermined size in a cylindrical packaging machine. This invention relates to an end seal device.

(Prior art) A belt-shaped film is run parallel to equally spaced objects to be packaged that are transported on a belt conveyor, and while the film is running, the film is rolled up into a tube shape around each of the objects to be packaged. The bag-making packaging machine that seals the tube between each of the articles to be packaged is equipped with a rotary end sealing device as shown in FIG. be. The sealing device shown in the figure has upper and lower hot plates 1 and 2.
The pins 9 and 10 at both ends of the heat plates 1 and 2 are engaged with the semicylindrical groove guides 3 and 4 provided on both sides of the heat plates 1 and 2.
is moved along the orbits of the grooved guides 3 and 4, and both heating plates 1 and 2 apply heat by pressing the film F within the length of the straight part formed on the guide. Therefore, it is commonly called Longsheera. However, due to its structure, the above-mentioned long sealer has the drawback that the following running difference occurs between the hot plates 1 and 2 and the film F, and unreasonable stress is applied to the film. That is, in FIG. 2, gears 5 and 6 are fixed to shafts 13 and 14 and mesh with each other.
Vertical long holes 7, 8 are formed in the long holes 7, 8.
8 are engaged with the pins 9 and 10, and by transmitting the rotating power of the gears 5 and 6 to the hot plates 1 and 2 via the pins, these hot plates 1 and 2 are connected to the grooved guide 3. , 4, but
Both ends of the straight portions of the grooved guides 3 and 4 are connected to the shaft 1.
Since the pins 9 and 10 are relatively far from each other and are closest to the shafts 13 and 14 at the midpoint of the same straight line, the traveling speed of the pins 9 and 10 is lowest at the midpoint of the straight line. More specifically, the hot plates 1 and 2, which have pressed the film F at one end of the straight line, slow down as they approach the middle, and then speed up again from the middle point toward the other end of the straight line. It is. On the other hand, the film F is run at a constant speed, and as a result, the running speed of the film F and the running speeds of the hot plates 1 and 2 are out of sync, and unreasonable stress is applied to the film.

(Problems to be Solved by the Invention) In view of the above points, the present invention provides a rotary end sealer in which a pair of hot plates rotates the hot plate and the film at the same speed in a region where the film is clamped. The purpose is to prevent tension or loosening from occurring.

(Means for Solving the Problems) In order to achieve the above object, the present invention supports both ends of the upper and lower heating plates by semicylindrical guides, and positions the heating plates at the center of each of the semicylindrical guides. A rotor provided on a shaft is engaged with both ends of each of the heating plates, and as each rotor rotates, each of the heating plates is moved along a semicylindrical guide, so that both heating plates approach each other so as to sandwich the film. In a sealing mechanism in which both of these hot plates are moved linearly by a predetermined length in a section, at least four chain foils are installed outside the sealing mechanism in the following relationship, namely: a. A hump on a part of the circumference. A cam and a first chain foil are installed together on the input shaft.

b. A second chain wheel is rotatably provided approximately in the middle of a swingable lever having one end pivotally supported on a pin and the other end along the circumferential surface of the cam.

c Attach a third
A spring is connected to the link so as to rotatably support the chain foil and to extend the third chain foil outward.

d. Connecting a fourth chain foil to the end of the shaft of the sealing mechanism.

e. Further, an endless chain is stretched around the four chain wheels so that the lever is pressed against the cam by the elastic force of a spring provided on the link.

(Operation) According to the present invention, when the first chain foil is rotated by the power of the input shaft, the rotational action is transmitted to the fourth chain foil through the chain, and further transmitted to the rotary seal mechanism. Since the cycle of the input shaft and the cycle of the hot plate of the sealing mechanism match, by matching the feed interval of each packaged item with the cycle of the input shaft, the pair of hot plates can be moved between each packaged item. Melt and seal the film. Moreover, the "bump" formed on the circumferential surface of the cam fixed to the input shaft is 1
Each rotation acts on a lever provided with a second chain foil, pulling the chain rotating at a constant speed by the height of the "hump" and changing speed so as to accelerate the pair of hot plates. Due to the structure of the long sealer, when the hot plate clamps the film and travels in parallel, the speed slows down and a speed difference is created between the film and the film, so the above-mentioned acceleration is applied at this speed-down part. As a result, the hot plate runs at the same speed as the film.

In addition, as mentioned above, the third chain wheel is supported by a spring and has a buffering function so that the lever can freely swing by the "bump" of the cam. The third chain foil therefore tensions the chain so that when the nub is separated from the lever, there is no slack in the chain. In this case, since the chain is pulled in the opposite speed direction, the speed of the pair of hot plates is reduced by an amount corresponding to the above-mentioned acceleration at the position where the films are released from each other. As a result, the cycle of the hot plate and the feeding interval of the packaged items always match.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a sealing mechanism, which rotatably supports shafts 13 and 14 above and below bearing plates 11 and 12 on both sides, and has keys 15 attached to both ends of each shaft, as already described. gear 5,
5, 6, 6 are fixed, and these upper and lower gears 5,
6, 5, and 6 are interlocked so that both shafts 13 and 14 are interlocked. Also, on the outside of each of the gears, cam plates 16, 16 are arranged on the inner surface of the bearing plate.
17, 17 are fixed, and the aforementioned semicylindrical groove guides 3, 3, 4, 4 are formed on these cam plates, and the elongated holes 7, 7, 8, 8 formed on each of the gears are fixed.
The pins 9, 9, 10, 10 at both ends of the hot plates 1, 2, which are slidably supported by the rollers 20, 20,
They are engaged via 21, 21.

On the other hand, FIG. 3 shows a transmission mechanism, which is a feature of the present application, in which a plurality of chain foils are supported on a plate 24, and the sealing mechanism described above is used with a chain 25 stretched over these chain foils. It seems to transmit power to. That is, one of the chain foils 26 is connected to the plate 2.
It is fixed to an input shaft 27 supported by 4. Another chain foil 28 has one end attached to the plate 2.
4 through a pin 29, and the other end is rotatably supported by a lever 31 attached to a cam 30 fixed to the input shaft 27. A further chain wheel 32 is pivotally mounted on the plate 24. Yet another chain foil 33 is rotatably supported on a slide base 35 provided on a guide 34 fixed on the plate. As shown in FIG.
The shaft 14 of the sealing mechanism is movable up and down along the shaft 14 of the sealing mechanism, and the shaft 14 of the sealing mechanism
A crank pin 39 fixed to is engaged via rollers 40. Another chain foil 41
One end of the lever 31 is rotatably supported by the other end of a link 43 which is pivotally supported on the plate 24 via a pin 42, and a spring 44 provided between the link 43 and the plate 24 allows the lower end of the lever 31 to be connected to the cam. Tension is applied to the endless chain 25 which is stretched over each of the chain foils so as to be in pressure contact with the chain 30.

The present invention is constructed as described above, and its operation will be explained below.

When the chain wheel 26 is rotated counterclockwise as shown by the arrow by the input shaft 27 in FIG.
The rotational motion is transmitted to the chain wheel 33 in FIG. 1 via the chain 25, and this motion is further transmitted to the shaft 14 via the crank pin 39.
Since the upper and lower gears 5 and 6 connect the upper and lower shafts 13 and 14, the clockwise movement of the lower shaft 14 is transferred to the upper shaft 13 as a counterclockwise movement, as already explained in FIG. As a result, the hot plates 1 and 2 begin to move. If we explain the crank mechanism shown in FIG. 1 at this point, it will be difficult to understand its operation, so it is preferable to assume that the pin 35a of the slide base 35 and the shaft 14 are located on a concentric line. Under such an assumption, since the crank function does not work, the motion of the chain 25 is directly transmitted to the shaft 14.

On the other hand, the motion of the input shaft 27 is also transmitted to the cam 30, and when the bump 46 formed on the cam 30 acts on the roller 47, the lever 31 is displaced counterclockwise about the pin 29 by the height of the bump 46. Then, the chain 25 is pulled by the chain foil 28. In this case, the spring 44 is stretched and the chain foil 41
is displaced to the left, allowing displacement of another chain foil 28. As a result, the speed of the chain foil 33 is increased by the amount that the chain 25 is pulled by the displacement of the chain foil 28, and the rotational speed of the hot plates 1 and 2 is temporarily increased. This relationship is easier to understand when viewed in FIG. That is, axis 1
If 3 and 14 are at a constant speed, the moving speed of hot plates 1 and 2 will be 1, as shown by line b in FIG.
During cycle S, the speed inevitably decreases in the range of α, that is, the linear range of the guides 3 and 4, but as shown by line a, the cam performs a compensating action that increases the speed of the chain wheel 33 in the range of α. The speed unevenness of the hot plates 1 and 2 is eliminated.

As described above, the present invention includes the first chain foil 26
During one cycle of a cam 30 provided coaxially with the cam 30, the cam moves the lever 31 provided with the second chain wheel 28, and the displacement of the lever is absorbed by the spring 44 of the link 43 provided with the third chain wheel 41. The chain 25 is accelerated by the displacement of the second chain foil 28, and the upper and lower hot plates 1 and 2 are accelerated in the linearly moving portion, eliminating deviation in movement from the film. Since the acceleration can be calculated on the straight line portion of Since the speed change action is applied to the hot plates 1 and 2 by the movement of There are effects such as being able to correspond.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a - line view of the previous figure, and Fig. 3 is - of Fig. 1.
The line view and FIG. 4 are action explanatory diagrams. 1, 2...Hot plate, 3, 4...Guide, 7, 8...
...Long hole, 25...Chain, 27...Input shaft, 30
...Cam, 35...Slide base, 37...Slide crank, 39...Crank pin, 43...
...Link, 46...bump.

Claims (1)

[Scope of Claims] 1 Both ends of the upper and lower heating plates are supported by semicylindrical guides, and a rotor provided on a shaft located at the center of each of the semicylindrical guides is engaged with both ends of each of the heating plates. As each rotor rotates, each of the hot plates is moved along the semicylindrical guide, and at a portion where both hot plates are close to each other so as to sandwich the film, both hot plates are moved linearly by a predetermined length. In the sealing mechanism, at least four chain foils are installed outside the sealing mechanism in the following relationship: a. The cam 30, which has a hump 46 formed on a part of its circumference, and the first chain foil 26 are connected to the input shaft. It will be attached to 27. b One end is pivoted to the pin 29 and the other end is supported by the cam 30.
A swingable lever 3 provided along the circumference of the
A second chain foil 28 is rotatably provided approximately in the middle of 1. c. A third chain foil 41 is rotatably supported at the open end of a link 43 whose one end is pivotally supported on a pin 42, and a spring 44 is connected to the link 43 so as to extend the third chain foil 41 outward. d. A fourth chain foil 33 is connected to the end of the shaft of the sealing mechanism. e Furthermore, the four chain foils 26, 2
An endless chain 25 is stretched between 8, 41, and 33 so that the lever 31 comes into pressure contact with the cam 30 by the elasticity of a spring 44 provided on the link. A bag sealing device for a packaging machine characterized by: