JPS624283B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly involves manufacturing a belt-shaped film made of thermoplastic synthetic resin into a cylindrical bag, and inserting contents into the cylindrical film, such as meat paste food, etc. Viscous materials such as yokan, cooked rice, and grease; fibrous materials such as konjac and bean sprouts; powdered materials such as beans, chestnuts, and flour; fruit juices; cooking juices;
The present invention relates to an automatic filling and packaging machine that automatically fills individual liquids such as water or a mixture thereof and seals a downwardly moving cylindrical film at predetermined intervals.

[Conventional technology]

Conventionally, these packaging machines include, for example, ADP [product name: Asahi Dow Packer, manufactured by Asahi Dow Co., Ltd.], KAP
[Product name: Kureha Auto Police Car, Kureha Chemical Co., Ltd.
Products called [manufactured] etc. are commonly used.

The structure of these devices differs slightly depending on the application and model, but the basic mechanism example is shown in the first example.
The explanation using a diagram is as follows.

That is, the strip film F is pulled out from a rolled layer of thermoplastic synthetic resin strip film F attached to the raw fabric shaft 2, and is placed in a cylinder at the folder 3 so that both ends of the strip film F are overlapped in the longitudinal direction. formed into a shape. Numeral 4 is a sealing device which has the role of heat-sealing both ends of the overlapping film strips F to form a cylindrical film F', and 6 is a feed roll which controls the running of the cylindrical film F'.
On the other hand, the contents are filled into the cylindrical film F' located at the upper part of the feed roll 6 from the direction of the arrow of the contents supply device 5 through a guide tube provided through the folder 3. Ru. These content supply devices have measuring machines suitable for the type of content, such as pressure pumps, weighing machines, and food troughs.
It has a function that automatically performs continuous and intermittent quantitative automatic filling. In addition, the feed roll 6 includes one that clamps the center part of the cylindrical film F', and one that clamps both sides of the cylindrical film F'. Since the cylindrical film F' is compressed in a shape and controls the running of the film, the cylindrical film F' can be reliably run at a constant speed without damaging the shape of the contents.
7 is a squeezing means, and this squeezing means 7 is a means for pressing the cylindrical film F' into a flat shape with a predetermined gap without preventing it from running at a constant speed,
Generally, a device is used in which a pinch roll, which has a circumferential speed that is approximately the same as the film running speed, is attached and detached at a predetermined period. This squeezing means 7 is a cylindrical film
In addition to the role of displacing the contents in F' and using that area as a sealing area as described later to ensure the sealing operation, it also plays a role in ensuring the sealing operation by displacing the contents in F' (especially those that require continuous filling). Therefore, it can also serve as a base for the contents. In this case, the operation of the squeezing means 7 needs to be synchronized with the filling cycle of the contents. Furthermore, depending on the contents, the sealing described below may be performed without the need for this squeezing means 7. At this time, the squeezing means 7 is omitted. 8 is a sealed box, and this sealed box 8
The cylindrical film F' is held at a predetermined interval and a means for sealing the part, such as a means for wire clipping or heat-sealing, and an operating mechanism for controlling the operation are built in, and the above-mentioned squeezing means 7 The squeezed portion of the cylindrical film F' is sealed at two locations, and the central portion is generally cut to automatically and continuously complete individual packages. The operation of this sealed box 8 is disclosed in detail in, for example, Japanese Utility Model Publication No. 48-9407 and is known, so a detailed explanation will be omitted, but in short, the main shaft 9 rotates at a constant speed by a drive source (not shown). The rotational movement of
It has a built-in groove cam, a heart cam (not shown), etc., for converting this rotational motion into reciprocating motion, and has the operating function of a series of sealing means. This sealed box 8 is also connected to a sealed box vertical movement mechanism which separately converts the rotational movement of the main shaft 9 into vertical movement and transmits it by the action of a crank mechanism (corresponding to 11), and the entire sealed box 8 It is also designed to rise and fall at predetermined intervals. This need, for example, applies to cylindrical films regardless of the sealing means employed.
It takes some time to seal F′. For example, when ligating and sealing with wire clips, it takes time to collect the cylindrical film F' → apply the wire bent into a U shape → deform the wire into an O shape → press the wire, etc.
Welding and sealing requires a period of time under pressure to heat the film, melt it, and then weld it. The time required for this sealing is the same as that of a cylindrical film running at a constant speed.
Since it is necessary to find the inside of F', the entire sealed box 8 is lowered at approximately the same speed as the traveling cylindrical film F', and the relative speed between the cylindrical film F' and the sealed box 8 is reduced to 0. It is a device that allows the sealing operation to be completed during that time.

Furthermore, this downward movement is set to be performed using the most efficient movement part of the crank mechanism, which exhibits a nearly sine curve, but this downward movement can be made more efficient without changing the rotational speed of the drive source. It is also a device that requires a longer stroke length of the crank mechanism to increase speed.
These devices are designed so that faster descending motion can be obtained from a crankshaft rotating at a constant angular velocity by increasing its stroke length.

Therefore, the capacity of the above packaging machine is L≒V/πN=S/π However, π: Circumference L: Stroke length of crank mechanism (upper limit is equipment length) V: Moving speed of cylindrical packaging N: It is necessary that the relationship between the number of times the sealing means operates per unit time S and the desired product length be satisfied.

And the above-mentioned packaging machines, which have been used for general purpose,
The recent demands for higher speed and smaller size (resource saving) for packaging machines have not been met. The reason for this is, for example, that unless the device is designed to allow a long stroke length to be set, it is impossible to achieve high speed while meeting the current product standards.
Developing a device that can increase the stroke length has the disadvantage of increasing the size of the device, adding noise-resistant, vibration-resistant, and wear-resistant measures, and making the device even heavier.

◎Due to the inertia problem, the lowering speed of the sealed box and the sealing operation speed at the beginning of startup are not synchronized with the film speed, making it impossible to start the device.Also, this phenomenon cannot be solved by simply increasing the size of the drive source. Due to some problems, at most 20% of the current capacity
However, there is a limit to how fast the increase in speed can be achieved, and it is not possible to meet market demands.

In particular, major modification of the packaging machine on the consumer side will place a large burden on the consumer in terms of installation space and modification costs, so it is important to keep this modification to a small scale and still meet the required capacity. This has become a responsibility issue for manufacturers.

[Problem that the invention seeks to solve]

As a result of various studies on ways to overcome the current situation, the inventors of the present invention found that: () The slow sealing action creates the need to keep the lowering speed of the sealed box constant over a wide range, making it difficult to set the speed. () It was determined that the method of setting the descending speed of the sealed box by the stroke length was the cause of the inertia and large equipment space, and specific improvement measures were proposed, especially for new equipment and existing equipment. After further research into a simple and practical device structure that can be applied to both improvements,
We have finally arrived at the present invention.

[Means for solving problems]

A mechanism for moving a cylindrical film filled with contents downward at a constant speed, a sealing means for capturing the cylindrical film at a predetermined interval and sealing the part, and a rotational movement of a main shaft as the operating mechanism of the sealing means. The cylindrical film has a built-in operating mechanism that converts the rotational motion of the transmission shaft transmitted and rotated by a drive system including gear engagement into horizontal reciprocating motion for performing the sealing operation of the sealing means using cams. It has a sealed box that seals a predetermined local area, and an operating mechanism that converts the rotational movement of the main shaft into the vertical movement of the sealed box as a sealed box vertical movement mechanism that controls the vertical movement (elevating movement) of the sealed box, Furthermore, the vertical movement (especially downward movement) speed of the sealed box, which should be synchronized with the traveling speed of the cylindrical film, can be adjusted by adjusting the stroke length of the operating mechanism that converts the vertical movement of the sealed box. In an automatic filling and packaging machine, as an operating mechanism for converting the above-mentioned vertical movement of the sealed box, the mechanism is installed at an eccentric position with respect to the main shaft so that the rotation of the main shaft becomes a circular motion centered on the main shaft. A pin, one end of which is rotatably provided in the frame by an arm shaft, is slidably inserted into a long groove bored in the frame, and the circular movement of the pin is controlled by the arm shaft. A swinging arm that converts vertical movement using a fulcrum, one end of which is rotatably attached to the swinging arm with a lower shaft, and the other end of which is rotatably attached to the lower end of the piston connected to the sealed box with an upper shaft. and a connecting part that transmits the vertical movement of the swinging arm to the piston, and the time required for the vertical movement of the swinging arm to move from top dead center to bottom dead center depending on the distance between the main shaft and the arm axis. / Required time from bottom dead center to top dead center = Set to a constant value within the range that satisfies the following relationship: Eccentricity as the gear in the drive system that transmits rotational motion from the main shaft to the transmission shaft The purpose is to employ an automatic filling and packaging machine having the above-mentioned combination mechanism in which gears or elliptical gears are arranged.

Hereinafter, the contents of the automatic filling and packaging machine according to the present invention will be explained in detail using drawings and the like.

FIG. 1 is a schematic front view of one embodiment of an automatic filling and packaging machine according to the present invention, and is also a schematic diagram illustrating the mechanism of a conventional device.

Since the operational functions of the apparatus shown in FIG. 1 have already been described in detail in the explanation of the prior art, the description will be omitted, and the main parts of the present invention that are different from the prior art will be described below.

An important feature of the present invention is to employ the above-mentioned combination of mechanisms in an automatic filling and packaging machine as represented in FIG.

First, the above mechanism will be explained in detail.

FIG. 2 is a schematic side view of an operating mechanism (corresponding to a conventional crank mechanism) that converts the vertical movement of a sealed box used in the automatic filling and packaging machine according to the present invention. In this FIG. 2, 11b is a pin,
It is provided eccentrically to the main shaft 9 on a rotary plate 11a fixed to the main shaft 9. Therefore, the rotation of the main shaft 9 can be made into a circular motion with the main shaft 9 as the center.

The pin 11b has one end slidably inserted into a long groove formed in a swinging arm 11d rotatably attached to the frame 1 by an arm shaft 11e. Therefore, the circular motion of the pin 11b is converted into vertical swinging of the swinging arm 11d with the arm shaft 11e as the fulcrum, with the pin 11b sliding in the long groove of the swinging arm 11d. Further, a part of the swinging arm 11d has one end connected to the swinging arm 11.
d itself has the other end connected to the piston 11c and the lower shaft 11 respectively.
g, a connecting portion 11f rotatably mounted on the upper shaft 11h (preferably each upper shaft 11 in FIG.
h, the lower shaft 11g and the main shaft 9 are connected so that their center positions are almost linearly aligned, so the vertical movement of the swing arm 11d is used as a complete vertical movement of the piston 11c. . in the end,
The rotational movement of the main shaft 9 is converted into the vertical movement of the piston 11c. Moreover, in this case, the vertical movement of the piston 11c (swinging arm 1
1d) can be taken out by changing the time required for the upward movement and downward movement due to the sliding movement of the pin 11b in the long groove. Therefore, if the other end of the piston 11c is connected to the sealed box 8, the sealed box 8
The vertical movement of the swing arm 11d substantially coincides with the vertical movement of the swing arm 11d.

Figure 3 shows the sealed box 8 when using the device shown in Figure 2.
The vertical movement (solid line) of the crank mechanism is shown in comparison with that of a conventional crank mechanism (broken line and one-dot broken line). In this figure, the horizontal axis represents the rotation angle (360 degrees per rotation) of the main shaft 9, and the vertical axis represents the relationship between the vertical movement distance of the sealed box and the rotation angle (360 degrees per rotation). Therefore, the magnitude of the slope of the curve also indicates the magnitude of the vertical movement speed. In this Figure 3, in the vertical movement of the sealed box of the conventional crank mechanism, when changing to a vertical movement twice as fast as the state (broken line) set under a certain condition, it is necessary to move once. The stroke length per movement was doubled (indicated by a one-point broken line) to create a curve with a large slope. However, in the automatic filling and packaging machine according to the present invention shown in FIG.
The stroke length is 1.2 under certain conventional conditions (dashed line)
A curve with a larger slope that is equivalent only by doubling (solid line)
This shows that it was possible to create relatively. In other words, the vertical movement of the conventional crank mechanism was a symmetrical sine curve-like vertical movement centered on the main shaft rotation angle of 180 degrees, but in the present invention (Fig. 2), the vertical movement is a rotation angle smaller than 180 degrees. The downward movement is completed at this point, while the upward movement requires a large rotational angle, making the upward and downward movement an asymmetrical curve. The adjustment of the desired rotation angle position can be determined by the distance between the main shaft 9 and the pin 11b and the distance between the main shaft 9 and the arm shaft 11e, but the former adjustment increases the stroke length. It is desirable to use the latter because it is easy to add the effect of

The goal of this adjustment is to achieve a range in which the vertical movement of the sliding arm 11d satisfies the following relationship: time required for moving from top dead center to bottom dead center/time required for moving from bottom dead center to top dead center = 0.5 to 0.9. By setting it to a constant value, it is possible to obtain a fast downward movement in which the downward movement of the sealed box 8 is completed within the rotation angle of the main shaft 9 in the range of 120° to 170°.

The principle of the above adjustment embodiment is shown in FIG.

In FIG. 4, X is the center of the main shaft 9, Y and Y' are the positions before and after the movement of the arm shaft 11e, L and L' are the distances between the main shaft 9 and the arm shaft 11e before and after the movement,
The circle centered on X is the rotation locus of the pin 11d, and M ₁ -M ₂ and N ₁ -N ₂ are the main shaft 9 and the arm shaft 11e.
When the distance between the sliding arm 11d is L and L',
The top dead center (M ₁ , N ₁ ) and bottom dead center (M ₂ ,
N ₂ ), the rotation angles shown by the arcuate arrows are the rotation angles (corresponding to the required time) from top dead center to bottom dead center and from bottom dead center to top dead center, and when the bold letters are L, The fine print indicates the state at L′. Therefore, the rotation angle of the main shaft 9 that can be used for the downward movement of the sealed box 8 is 170° when the distance is L, and 120° when the distance is L', and the ratio of the time required for the vertical movement is as follows: When 170/190=0.9, when L' 120/2
40=0.5, in short, the distance is adjusted within the range of L to L',
It can be seen that the speed of the downward movement can be varied. As can be seen from Fig. 2, these are both within the range in which the rotation locus of the pin 11d can be performed smoothly, and in which the vertical movement length (equivalent to the stroke length) of the piston 11c can be adjusted without greatly changing. It is also obvious.

In addition, to change the distance to the above range of L→L′,
For example, it is easiest and most reliable to shift the position of the frame 1 in FIG. 2 and attach a sliding arm 11d that matches the length of the frame 1, and alternative methods can be easily thought of.

Therefore, in the automatic filling and packaging machine according to the present invention, the sealed box 8 can be synchronized with the cylindrical film F' traveling at high speed without increasing the stroke length, which would increase the size of the device or change the direction of increasing inertia. The downward movement of can be extracted. Therefore, it goes without saying that adding a function to slightly adjust the stroke length is not a big deal as long as the space of the device and the driving force allow.

Next, the mechanism of the present invention will be described.

This requirement is due to the fact that the operation mechanism of the sealing means of conventional automatic filling and packaging machines requires a considerable amount of operational time on top of the time required for the sealing operation that is absolutely necessary to seal the cylindrical film. This idea was derived from the fact discovered by the present inventors that the time required for sealing is longer than the apparent time required.

Therefore, reducing the time required for operation and the apparent time required for sealing are closely related to the practical application of the curved portion of the mechanism with a large slope, that is, a fast descending speed. It is a proposition to have.

5 and 6 are cross-sectional views taken along line A-A in FIG.
Fig. 5 shows the state of the gears 10, 10' which transmit the information to the transmission shaft 9'' via the eccentric gear, and Fig. 6 shows the case where the gear is an elliptical gear. be.

This rotation of the transmission shaft 9'' is caused by the rotation of the sealed box 8 as described above.
It is converted into a reciprocating motion by a groove cam, a heart cam, etc. (described later) built into the box 8, and this reciprocating motion plays a role in controlling the operation of the sealing means. Therefore, the rotation of the main shaft 9 is partially accelerated and transmitted to the transmission shaft 9'' via the eccentric gears or elliptical gears 10, 10', and the faster rotating portion is used as the operating part of the sealing means. With such an operating mechanism, unnecessary operational time is reduced.Moreover, the use of eccentric gears or elliptical gears 10, 10' allows for example You can obtain advantages, and even when building a new device, it can be completed with a small change in specifications.However, it should be noted that with an eccentric gear, there is only one speed increasing part per rotation, Since an elliptical gear has two speed increasing parts, it may be difficult to adjust the rotation speed on the interlocking mechanism or cut the teeth.Therefore, in order to simplify the device, it is recommended to use an eccentric gear. In many cases, it is more advantageous to use eccentric gears.In other words, it may be difficult in terms of machining technology to precisely grind the number of teeth using eccentric gears.However, if the amount of eccentricity is When the ratio is in the range of 0.05 to 0.1, it is particularly advantageous because it can be put to practical use by simply shifting the meshing depth of the gears somewhat from the normal position, making it extremely easy to modify.

7, 8, 9, and 10 show specific examples of the reciprocating motion converting device built in the sealed box 8, and illustrate the case of a grooved cam.

That is, in FIGS. 7 to 10, 8e is the center of the transmission shaft 9'', 8d is a crank arm fixed to the transmission shaft 9'', 8c is a sliding shaft with a rotating ring fixed to one end of the crank arm 8d, 8b is a groove of the cam plate 8f, and 8a is a sealing means attached to the tip of the cam plate 8f. The rotation of the transmission shaft 9'' is caused by the fact that the sliding shaft 8c is rotated together with the crank arm 8d along the groove 8b of the cam plate 8f in the direction of the arrow.
As pressure is applied to the groove 8b and the cam plate 8f slides back and forth, one rotation of the transmission shaft 9'' causes the cam plate 8f to slide back and forth.
This will be converted into one round trip.

Further, FIG. 7 shows a conventional grooved cam, FIGS. 9 and 10 show a grooved cam that is effective for the automatic filling and packaging machine according to the present invention, and FIG. 8 shows a grooved cam that is difficult to put into practical use.

The difference between the three above is due to the problem of which range of rotation angle within one rotation (rotation angle of 360 degrees) of the transmission shaft 9'' is the so-called effective rotation angle range that contributes to the reciprocating motion of the cam plate 8f. , in the case of Fig. 7, the entire rotation angle range of 360° is used for reciprocating motion.Therefore, the speed per reciprocating motion is slow.On the other hand, the grooved cam of Fig. 8 theoretically The effective rotation angle is 180°, and the other 180°
゜ means that the cam plate 8f is at rest, so the reciprocating speed should be twice that of Fig. 7, but in reality, the sliding shaft 8c cannot move smoothly and the grooved cam will be damaged. Become. The ones in Figures 9 and 10 are the ones in Figures 7 and 8.
The improved product shown in the figure can be manufactured with an effective rotation angle ranging from approximately 320° to 240°, and there is only a rest period for the cam plate 8f (equivalent to 40° to 120°). This has the advantage of increasing the reciprocating speed. Therefore, the sealed box 8 of the automatic filling and packaging machine according to the present invention incorporates a grooved cam as shown in FIGS. When synchronizing the speed increasing part and the effective rotation angle range to perform a sealing operation,
Since the apparent sealing action is greatly shortened, this has the advantage of making the previously described mechanism more desirable in practical use of the steeply curved portion of the mechanism.

The above reciprocating conversion device was explained using the example of a grooved cam, but when changing this to a heart cam (not shown), for example, the effective rotation angle range can be changed from approximately 320° to 180°. You can even get things.

Improvements to the sealing means operating mechanism can be easily completed by simply replacing gears and cams.
It is possible to substantially increase the reciprocating speed by more than 1.5 times.

By adopting the above-described configuration, the present invention has been able to improve the two problems that were the fundamental causes of hindering an increase in packaging capacity.

That is, by speeding up the sealing operation and shortening the required time from the above structure, the traveling speed of the cylindrical film when the sealed box is lowered, which must be synchronized with the traveling speed of the cylindrical film at least during the sealing operation, can be improved. By shortening the necessary synchronization time period, it is easy to take out the rapid downward movement of the sealed box that synchronizes with the travel of the cylindrical film, and from another point of view, it is possible to synchronize with the rapid downward movement of the sealed box even if the downward movement of the sealed box is accelerated. The above-mentioned structure makes it possible to speed up the downward movement of the sealed box without making the stroke length of the vertical movement of the sealed box too long.

These two improvement effects, for this type of automatic filling packaging machine, increase the packaging capacity to more than 50% of the current capacity while having sufficient setting margin to meet packaging product standards. ◎In addition, the improvement in the above-mentioned capacity can be achieved with less increase in inertia and simple structural improvements, so it can be realized as a high-speed packaging machine with less noise, vibration, and parts wear. This can be achieved by improving
The present invention is useful for industry because it can be applied not only to the construction of new packaging machines but also to the modification of existing packaging machines, and can be utilized to meet the needs of consumers.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the entire front view of one embodiment of the automatic filling and packaging machine according to the present invention (however, the outline of the device mechanism can be transferred to that of a conventional packaging machine), and Fig. 2 is an automatic filling and packaging machine according to the present invention. An example of a side view of a sealed box up/down mechanism of a packaging machine, FIG. 3 is an example of the operation of the mechanism shown in FIG. 2, FIG. 4 is an example showing the principle of adjustment of the mechanism shown in FIG. 2, and FIG. Figures 6 and 6 are schematic examples of the eccentric gear and elliptical gear used in the automatic filling and packaging machine according to the present invention, and Figures 7 to 10 are specific examples of the reciprocating motion conversion device built in the sealed box. be. Symbol explanation, F'; cylindrical film, 1; frame, 6; feed roll, 8; sealed box, 9; main shaft, 9''; transmission shaft, 10, 10'; eccentric gear or elliptical gear, 11; vertical movement of sealed box Device, 11b;
Pin, 11c; Piston, 11d; Swing arm,
11e; arm shaft; 11f; connecting portion; 11g; lower shaft; 11h; upper shaft.

Claims (1)

[Scope of Claims] 1. A mechanism for moving the cylindrical film F' filled with contents downward at a constant speed, a sealing means for capturing the cylindrical film F' at a predetermined interval and sealing the part, and The main shaft 9 serves as the operating mechanism of the sealing means.
The transmission shaft 9'' rotates by transmitting the rotational motion of the
a sealing box 8, which has a built-in operating mechanism for converting the rotational motion of the cam into a horizontal reciprocating motion for performing a sealing operation of the sealing means, and seals a predetermined portion of the cylindrical film F'; The sealed box vertical movement mechanism that controls the vertical movement (elevating movement) of the box 8 includes an operating mechanism that converts the rotational movement of the main shaft 9 into the vertical movement of the sealed box 8,
The vertical movement (especially downward movement) speed of the sealed box 8, which should be synchronized with the traveling speed of F', is automatically adjusted by the stroke length of the operating mechanism that converts the vertical movement of the sealed box 8. In the filling and packaging machine, as an operating mechanism that converts the above-mentioned vertical movement of the sealed box, it is located at an eccentric position with respect to the main shaft 9, and the rotation of the main shaft 9 is made into a circular motion centered on the main shaft 9. One end of the pin 11b is rotatably provided in the frame 1 by an arm shaft 11e, and the pin 11b is slidably inserted into a long groove bored. The circular motion of the arm axis 11e
A swinging arm 11 that converts vertical movement using a fulcrum.
d, and one end thereof is attached to the swinging arm 11d with the lower shaft 1.
1g, and the other end is rotatably attached to the lower end of a piston 11c connected to the sealed box 8 by an upper shaft 11h, and the swing arm 11
d, and a connecting portion 11f that transmits the vertical movement to the piston 11c.
The vertical movement of d is set to a constant value within the range that satisfies the relationship: Time required from top dead center to bottom dead center / Time required from bottom dead center to top dead center = 0.5 to 0.9 Rotation from main shaft 9 An automatic filling and packaging machine characterized in that eccentric gears or elliptical gears are arranged as the gears 10, 10' in the drive system for transmitting motion to the transmission shaft 9''.