JPS6025366Y2 - Packaging machine bag sealing device - Google Patents

Description

[Detailed description of the invention] This invention is a rotary type for cutting a packaging tube made of thermoplastic synthetic resin film into a predetermined length in a bag-making type coloring machine and welding and sealing the cut part. This invention relates to a long seal device.

As shown in FIG. 2, a pair of sealing plates 5, 6 engaged with gears 3.4 by shafts 1, 2 are synchronously moved along semicylindrical groove guides 7.8, and The tube 9 is secured by both seal plates 5 and 6 at the straight portion 7av8a of the guide.
A long sealer device has been provided which allows for a longer welding time.

When traveling along line 8a, this causes uneven speed.

That is, at the midpoint between the straight portions 7a and 8a, the seal plate is aligned with the axis 1.
, 2, the running speed of these seal plates 5, 6 is lowest at the midpoint between the straight portions 7a, 8a.

A speed difference is then created between these seal plates 5.6 and the tube 9.

Therefore, in order to control the seal plates 5 and 6 at a constant speed to eliminate the speed difference with the tube 9, the applicant of the present application provided Japanese Patent Application Laid-Open No. 131131/1984 as an earlier application.

The gist of the application is also shown in Figure 2.

That is, the power endless chino 11 of the driving shaft 10
While transmitting rotational motion to the shaft 1 through the motive force 10, the bulging portion 12a formed on the arm 12 fixed to the motive force 10 acts on the swinging lever 14 to move the seal plates 5 and 6 at the straight portions 7a and 8a. It is designed to accelerate.

In other words, when the bulge 12a kicks the lever 14, the tension foil 17 can be displaced in the direction of the arrow against the tensile force of the spring 16, so the swinging lever 14 swings in the direction of the arrow 15. to periodically accelerate the cheno 11.

So what is the acceleration timing of the aforementioned Cheno 11 and the straight line portion of the seal plates 5 and 6? By matching the travel timings at a and 8a, the seal plate 5.6 travels at a constant speed on the straight portions 7a and 8a.

However, it has been found that when a periodic transmission mechanism 19 that operates like the wavy line shown in FIG. 3 is installed between the chino 11 and the shaft 1, the following defects occur.

That is, the periodic transmission mechanism 19
The output shaft 21 engaged through the foil 20 is arranged at an eccentric position of the secondary input shaft 1, and the output power of the pin 23 fixed to the output shaft 21 through the arm 22 is transferred to the guide arm 2.
4 to the secondary input shaft 1, and the constant rotational power of the output shaft 21 is transmitted to the secondary input shaft 1 via the output shaft 21 (actually, periodic acceleration occurs due to the action of the bulge 12a, but this is ignored in this case).

] is transmitted to the shaft 1 as a periodic speed change input as shown by the wavy line in FIG.

One cycle S in FIG. 3 corresponds to one rotation of the secondary input shaft 1, and by vertically displacing the center of the shaft 21 and changing the eccentricity 1, the shift value during one cycle S is arbitrarily adjusted. be able to.

Since the time required for one rotation of the seal plates 5 and 6, that is, the time required for one cycle S, is always constant, if the length of the packaged object contained in the tube 9 is changed, the traveling speed of the tube 9 will change accordingly. must be changed.

Then, a speed difference inevitably occurs between the seal plates 5, 6 and the tube 9, so the periodic speed change mechanism 19 allows the seal plates 5, 6 and the tube to move without changing the time required for one cycle of the seal plates 5, 6. This is to adjust the speed difference with 9.

As described above, the periodic transmission mechanism 19 controls the speed of the seal plates 5 and 6 in response to the speed change of the tube 9, while the cam 12 is the linear portion of the seal plate 5.6. This is speed control corresponding to traveling at speeds a and 8a.

However, in the structure shown in FIG. 2, if the output shaft 21 is lowered in order to change the eccentricity l in accordance with the change in the running speed of the tube 9, the arm 24 will become secondary due to the engagement of the pin 23. Rotate input shaft 1 slightly clockwise.

Such rotation is a malfunction during adjustment, and the position of the seal plates 5.degree. 6 moves during this adjustment, so that the timing of operation of the cam's bulging portion 12a and the positions of the seal plates 5, 6 do not match.

In view of the above points, the present invention provides a cam for controlling the traveling speed of the seal plate in a straight line on the rotating shaft of the seal plate, and adjusts a periodic transmission mechanism so that the cam and the seal plate operate in synchronization. This is to prevent deviation between the seal plate and the cam.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, a driving wheel 26 fixed to a driving force 25 and a wheel 28 fixed to an output shaft 27 are connected via an endless chain 29 to a tension wheel 30.
and the pilot wheel 31 are engaged with each other.

The tension wheel 30 is located on the slack side of the chino between the drive wheel 26 and the output wheel 28 and applies tension to the chino 29 with a spring 32, while the pilot wheel 31 is located on the slack side of the chino between the drive wheel 26 and the output wheel 28. Tension is applied to the chino 29 on the tension side between the two.

Further, the output shaft 27 and the secondary input shaft 33 are engaged with each other via a periodic transmission mechanism 34.

The mechanism includes a pin 3 provided on the output shaft 27 via an arm 35.
6 is configured to engage with the guide arm 37 of the secondary input shaft 33.

The secondary output shaft 33 and the driven shaft 3B are connected to a pair of gears 39.
．． 40, and the gear 39.40
The ends of the pair of seal plates 41 and 42, which were respectively engaged with the grooves 43 and 44, are engaged with the semicylindrical groove blades 43 and 44.

Furthermore, a cam plate 45 is fixed to the driven shaft 38, and the other end of the drive lever 46 is engaged with the cam plate 45 at one end, and the driven lever 47 is provided with the pilot wheel 31 at one end.
It is connected to the other end via a link 48.

Both levers 46 and 47 have their respective intermediate portions connected to support shafts 49.
．． The drive lever 46 is pivoted via a support shaft 49.
The ratio of the lengths A and B on both sides of the driven lever 47 is 2:1, and the ratio of the lengths C and D on both sides of the support shaft 50 of the driven lever 47 is 1:1.
, respectively, so that the amount of expansion of the cam plate 45 and the amount of displacement of the pilot wheel 31 are balanced.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

When the drive wheel 26 is driven counterclockwise by the driving force 25, the driving force is transmitted to the output shaft 27 via the chino 29, and the output shaft 27 and the power are further transmitted to the periodic transmission mechanism 34.
is transmitted to the secondary output shaft 33 via the gear shift value shown by the wavy line in FIG.

Further, since the rotational power of the secondary input shaft 33 is transmitted to the driven shaft 38 via the gear 39.40, the pair of seal plates 41.42 are moved along the semicylindrical cam 43.44 to the third factor. It revolves at a similar periodic speed change value.

On the other hand, the cam plate 45 fixed to the driven shaft 38 rotates synchronously with the driven shaft 3B and acts on the drive lever 46.

That is, the shape of the cam plate 45 has a shape substantially corresponding to the shape of the semicylindrical grooved cam 44, and the shape of the seal plate 4
1.42 passes through the linear portions 43a and 44a of the cam, the driving lever 46 is swung counterclockwise about the shaft 49, and the swiveling motion is transmitted to the driven lever 47 via the link 48.

Therefore, the pilot wheel 31 pulls the chino 29 downward, temporarily accelerating the secondary output shaft 33 via the output shaft 27.

In other words, the seal plates 41, 42 are the straight portions 4'3a of the cam,
To accelerate axis 33.38 when traveling on 44a,
The Shinil plates 41 and 42 run at a constant speed even in the straight portions 43a and 44a and synchronize with the speed of the tube F.

As mentioned above, the cam plate 46 partially accelerates the transmitted power by the action of its partial bulge, and averages out the movement of the seal plates 41 and 42 in the straight portion. When the engine accelerates, the acceleration is fed back to the cam plate, thereby increasing the rotational speed of the cam plate.

The acceleration power is then transmitted to the transmission power.

This phenomenon is called a reflex phenomenon of movement, as it resembles the image of two mirrors facing each other.
Although the design of the shape of the cam plate 15 is complicated in some respects, it is possible to create a design that is close to the intended purpose if calculations are made taking the above-mentioned phenomena into consideration.

Next, if the output shaft 27 is moved downward in order to change the eccentricity value 1, the slack of the chino 29 will be reduced by the spring 32.
However, due to the movement of the pin 36, the secondary input shaft 33 rotates slightly clockwise, displacing the position of the seal plates 41, 42.

However, since the cam plate 45 fixed to the driven shaft 38 also rotates synchronously, no positional deviation occurs between the cam plate 45 and the seal plates 41, 42.

As described above, in the present invention, the levers 46 and 47 are periodically oscillated by the cam plate 45, the pilot wheel 31 provided on the driven lever 47 is used to pull the chino 29, and the seal plate is rotated by the periodic acceleration of the secondary input shaft 33. 41.42 is the straight part 4 of the cam
3a and 44a, and the control function to run at a constant speed, and the output shaft 27
The cyclic speed change control function of the seal plates 41 and 42 by the cyclic speed change mechanism 34 interposed between the output shaft and the secondary output shaft 33 is provided, and the tube F that inevitably occurs when the seal plates 41 and 42 travel linearly in the Ronog sealer. The cam plate 4 for periodic acceleration is designed to eliminate the speed difference between the cam plate 41 and the seal plate 41 and the seal plate 42 caused by the major adjustment of the film running speed. . . , 5 is provided on the rear shaft of the periodic transmission mechanism 34 in the power transmission order direction, so that by adjusting the eccentricity 1 of the periodic transmission mechanism 34, the mutual relationship between the seal plates 41, 42 and the cam plate 45 can be adjusted. Since it is possible to prevent positional deviation between the two, it is possible to use the periodic acceleration function and the periodic shift function in combination, which has the effect of improving accuracy.

[Brief explanation of drawings]

FIG. 1 is a developed view of the mechanism showing an embodiment of the present invention, FIG. 2 is an explanatory view of the prior application, and FIG. 3 is an explanatory view of the operation. 25... Driving shaft, 26, curve, driving wheel, 27
...Output shaft, 28 ...Output wheel, 3
0...Tension wheel, 31...Pilot wheel, 33...Secondary input shaft, 34...
...Periodic transmission mechanism, 38...Driven shaft, 4
1... Seal plate, 42... Seal plate,
45... Cam plate, 46... Drive lever, 47... Driven lever 6

Claims (1)

[Scope of utility model registration request] The pair of seal plates are each guided along the semicylindrical grooved cam by the rotational power of a pair of shafts arranged in parallel, and the two seal plates are placed in a predetermined position at the position where the two seal plates are closest to each other. In a device that applies heat to the film by running the film in a straight line, an endless chino 29 is stretched with sufficient slack between the driving wheel 26 and the output foil 28, and the above-mentioned A pilot wheel 31 pivoted to one end of a lever 47 with a pin 50 as an axis is engaged with the tension side of the chain 29 that occurs when the driving wheel 26 is driven, and a tension wheel is attached to the slack side of the chain 29. 30 and further connected to the shaft 27 of the output wheel 28 via a periodic transmission mechanism 34.
3 to the shaft 3.3 for actuating both the seal plates 41.42.
A cam plate 45 of a type corresponding to the shape of semicylindrical grooved cams 43 and 44 that guide the seal plate is fixed to the operating shaft 38 of the seal plate. At the same time, a link 48 is established between the other end of the swinging drive lever 46 whose one end is engaged with the seal plate 45 and the other end of the swinging driven lever 47 whose one end supports the pilot wheel 31. When the eccentricity amount 1 between the output wheel shaft 2 and the secondary output shaft 38 is adjusted, the cam plate 45 moves by the eccentricity adjustment amount 1 via the periodic transmission mechanism 34. Eventually, the power is fed back to the periodic transmission mechanism 34 to return the cam plate 45 to the position before actuation, but the drive lever 46 and A bag sealing device for a packaging machine in which the lever ratio of a conventional lever 47 is set.