JPS6231377Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an improvement of an automatic packaging machine that fills a packaging film formed into a tube with a fixed amount of food or other packaged items, and seals the top and bottom of this filling part using heat welding means. Regarding.

That is, an example of an automatic packaging machine to which the present invention is directed is as shown in FIG. 1, and its outline will be briefly explained to help understand the gist of the present invention, which will be described later. In FIG. 1, a suitable packaging film 1 such as laminated paper is wound around a roll and is freely rotatably wound around a machine body 2, and the packaging film 1 pulled out from this rolled packaging film is placed on a guide roller 3a.
~3f, dancer roller 4, and slitter 5
It is sent to the packaging department via . dancer roller 4
is for applying tension to the packaging film 4,
The slitter 5 cuts the packaging film 4 into two strips in the horizontal direction to enable double packaging, and both are well-known mechanisms. On the other hand, in the packaging section, the packaging film 1 is wound around a forming chute 6 called a forming plate and formed into a tube shape. 7 to heat weld (so-called vertical seal) to form a complete tube 1a. On the other hand, food, such as sugar, filled in the hopper 8 is measured by the measuring section 9, and then passed through the forming chute 6 and filled into the tube 1a.
The horizontal heat welding means 10
The cutter 11 moves up and down through the arrows A → B → C → D, and during the downward movement, the cutter 11 individually cuts the continuously packaged packages by heat welding (so-called horizontal sealing) and sealing. . In addition, the photoelectric device 12 detects the sensor mark printed on each bag length of the packaging film 1, and detects the pattern such as the product name also printed on the packaging film 1.
Synchronization is achieved with film feeding (that is, film traction by lowering of the lateral sealing means 10). Such packages are wrapped with three-sided seals, and to give a familiar example, we use them for everyday coffee, coffee, etc.
An example of this is the stick-shaped sugar package used when drinking black tea. However, it goes without saying that there is no reason to be limited to this.

By the way, in the above packaging machine, the tube 1a
The quality of horizontal sealing is related to the length of the sealing time.If the time is short, packaging errors will occur due to insufficient heat sealing, so it is desirable to lengthen the sealing time. Specifically, this sealing time is the downward stroke range of the lateral heat welding means (hereinafter referred to as lateral sealing means) 10, and the first
The sealing time can be lengthened by making the range shown by arrow B in the figure longer, or by making the horizontal sealing means 10 descend slowly in this range. However,
As other issues of the packaging machine, it is desired to make the machine body 2 more compact and to increase the speed of the packaging operation, so it is not possible to increase or slow down the downward stroke arbitrarily.

The present invention was devised with the aim of satisfying these contradictory demands, and its gist is to separately provide a sub-thermal welding means at an upper position of the lateral heat-welding means. while the lateral heat welding means is raised away from the tube;
The sub heat welding means is configured to sandwich and heat weld the next part of the tube to be heat welded, and the cooperation of both heat welding means does not increase the vertical stroke of the lateral heat welding means. Then, without slowing down the lifting speed, the time during which the horizontal sealing means is rising, which was conventionally considered dead time, is utilized as heat welding time to increase the actual heat welding time,
In addition, it is possible to perform sufficient heat sealing without reducing the speed even for short bags with severe heat sealing conditions, and the filling can be started for an amount corresponding to the rising time of the horizontal sealing means. The present invention has the advantage of achieving an overall compact design of the machine and speeding up the packaging operation.

The details of the present invention will be explained based on FIG. 2 and the following drawings. As shown in FIG. 2 to FIG. 1 unit
Both ends of the holding shafts 14, 14 inserted through the lift frames 15, 15 are attached to boss portions (which have linear bearings built in) 1 on the guide shafts 16, 16 in the lifting frames 15, 15.
7 and 17 are slidably fitted onto each other, and a pressure spring 18 is interposed between opposing boss portions 17 and 17 on each guide shaft 16 and 16, thereby allowing both heaters 10a and 10b to Each lifting frame 1 is pressed and biased in the direction of separating from each other.
5 and 15 are fixed to the lifting rods 19 and 19. Further, pressure rollers 20... are supported near both ends of the holding shafts 14, 14, pusher plates 21... are arranged on the backs of the respective pressure rollers 20, and pusher plates 21... are placed in contact with the pressure rollers 20. Shafts 22, 22
It is incorporated in a parallel link mechanism 23 that moves up and down using the fulcrum as a fulcrum, and the pusher plates 21 are configured to move in parallel in parallel. 24 indicates a rotation link in the parallel link mechanism 23. Therefore, as the elevating rods 19, 19 move up and down, the heat sealing means 10 moves up and down integrally, and at this time, the pusher plate 21 pushes the socket roller 2 as shown by the solid line.
By pressing 0..., the heaters 10a, 10
b contacts against the push springs 18, 18, sealing the tube 1a between them, and the pusher plate 21...
By moving the heaters 10a and 10b backward as shown by the dashed lines in the figure, both heaters 10a and 10b are separated from each other, and the combination of these causes a circular motion along the arrows A, B, C, and D shown in FIG. 1 to appear. On the other hand, in the upper position of the horizontal sealing means 10, there is a sub-thermal welding means (hereinafter referred to as sub-sealing means) 2 adjacent thereto.
5 will be deployed. This sub-seal means 25 is operated to approach and separate by a clamping mechanism described below, and has a block 27 that rotates around its horizontal axis 26, and moves back and forth to the left and right of the rotation block 27. A pair of rods 28, 28 are inserted in parallel, and the rear ends of the reciprocating rods 28, 28 are connected by a connecting bar 29, and a fixed bar 30 fixed to both rods 28, 28 is provided between the front ends.
and can freely slide relative to both rods 28, 28, and this sliding bridges the fixed bar 30 with the movable bar 31 that moves near and far, and each bar 30, 3
Heater 2 is connected to 1 through heater stands 32 and 32, respectively.
5a and 25a, and air cylinders 33 and 34 are interposed between the movable bar 31 and the rotating block 27, and between the connecting bar 29 and the rotating block 27, respectively, so that both As the air cylinders 33, 34 are simultaneously extended, the forward/retractable rods 28, 28 and the fixed bar 30 are pulled to the right in the drawing, and the movable bar 31 is pushed to the left in the drawing, thereby causing both the heaters 25a, 25a are close to each other and in contact with each other, and both air cylinders 33 and 34
When contracting, both heaters 25a, 25a are separated by an operation opposite to the above. Further, a tension spring 35 for pulling the sub-seal means 25 into a horizontal lateral position is attached to the fixed block 27 between it and a fixed frame 36, and a stopper 37 is attached to the fixed block 27, with which the advancing and retracting rods 28, 28 abut in this horizontal lateral position. In addition, a protruding rod 38 for pushing up the sub-sealing means 25 against the tension spring 35 is led out from an appropriate member of the horizontal sealing means 10, such as the elevating frame 15, below the reciprocating rods 28, 28. These tension springs 35 and stopper 3
Reference numeral 7 constitutes a holding means for the sub-seal means 25.

In the above configuration, as shown in FIG. 3, the horizontal sealing means 10 is at the rising end, whereby the advancing and retracting rods 28, 28 are pushed up by the protruding rod 38, and the sub-sealing means 25 is in an upwardly lifted position. At the same time, the heaters 10a, 10a, 25a, 25a in both sealing means 10, 25 are located at positions separated from each other. From this state, the heaters 10a, 1
0a is the tube 1 which is inserted between both heaters 10a, 10a by moving forward as shown by arrow A in FIG.
A is clamped, and then the tube 1a is moved downward as shown by the arrow B in FIG. 1, and the tube 1a is pulled downward by the length of one bag, and during this time, the clamped part of the tube, that is, the part to be sealed, is heat-sealed. Moreover, since the pushing-up force against the advance/retreat rods 28, 28 is eliminated due to the lowering, the sub-seal means 25 assumes a horizontal lateral position in which the tension spring 35 abuts against the stopper 37. Next, as the horizontal sealing means 10 reaches the lowering side and stops as shown in FIG. 4, or as the heaters 10a, 10a are separated in the direction of arrow C in FIG. , 34 are extended, the heaters 25a, 25a clamp the next sealed part of the tube 1a, and apply heat sealing to that part until the lateral sealing means 10 rises. That is, the transverse sealing means 10 retreats in the direction of arrow C and then rises in the direction of arrow D, and the protrusion rod 38 forming the release means together with the forward and backward movement rods 28, 28, which are rotatable about the transverse shaft 26 via the block 27, Immediately before pushing up the advance/retreat rods 28, 28 again, the air cylinders 33, 34 are contracted.
In addition, the heaters 25a, 25a are separated,
When the horizontal sealing means 10 reaches the rising end, the sub-sealing means 25 escapes upward by the relief means as shown in FIG. 2
Sandwich the heat-sealed part 5 and apply the same heat-sealing to that part. Thereafter, continuous packaging is performed by repeating this operation.

Therefore, the heat sealing of the tube 1a in the lateral direction is performed by the cooperation of the lateral sealing means 10 and the sub-sealing means 25, and the sub-sealing means 25 does not participate in the heat sealing of the lateral sealing means 10, but at least utilizes the rising time. Because it is done, tube 1a
The heat sealing time is increased dramatically.

Incidentally, as a lifting mechanism for the horizontal sealing means 10,
If the configuration shown in FIG. 5 and subsequent figures is used, it is suitable for the following points.

That is, as shown in FIG. 5, the lower end of the lifting rod 19 is equipped with a reciprocating swinging arm 40 that moves up and down around a horizontal shaft 39, and the lower end of the lifting rod 19 is attached to the free end of the arm 40. are connected to each other via a well-known universal joint 41 in order to convert the vertical movement of the swinging arm 40 into vertical lifting movement of the lifting rod 19, and a long hole 42 extending in the longitudinal direction of the swinging arm 40 is formed. and the arm 40
A guide rail 4 supported by a pedestal 43 in close proximity to
4 are arranged on the left and right, and a sliding table 45 is slidably engaged and placed across the guide rails 44, and a motor (not shown) is mounted on this sliding table 45.
A crank mechanism 46 interlocked with is mounted on the tower, and a crank pin 47 of this crank mechanism 46 is slidably engaged with the elongated hole 42 via a rotor 48, thus forming a drive mechanism A for the swinging arm. Ru. Furthermore, a bracket 49 with a screw hole is vertically installed from the bottom surface of the sliding table 45, and a bracket 49 with a screw hole is installed correspondingly to the bottom surface of the sliding table 45.
An adjustment bolt 50 is horizontally supported so that it can only rotate freely, and the inner end of this adjustment bolt 50 is attached to the bracket 49.
is screwed onto and inserted into the rotary operating handle 5, and a rotary operating handle 51 is fixed to the outer end of the rotary operating handle 5.
1, by rotating the adjustment bolt 50 in either the forward or reverse direction, the sliding table 45 is moved along the guide rail 44 in any direction toward or away from the horizontal axis 39, that is, in the longitudinal direction of the swinging arm 40. The engagement position of the crank pin 47 with respect to the elongated hole 42 is changed. Therefore, a swinging stroke adjusting means B is configured. Also, the horizontal axis 3 mentioned above
The oscillation stroke fine adjustment means C as shown in FIG. 6 is constructed in the 9 part. In other words, the horizontal shaft 39, onto which the boss portion 52 of the swinging arm 40 is fitted via the bearing 53, has small-diameter screws on both end surfaces thereof that are mutually eccentric with respect to the horizontal shaft 39 (the amount of eccentricity is indicated by d). The rotation center shafts 54, 54 are integrally arranged, and the rotation center shafts 54, 54 are connected to the bosses 5 of the support stands 55, 55.
6 and 56 so as to be rotatably inserted and supported thereon, and furthermore, a pulley 57 for inputting rotational force from a servo motor (not shown) is fixedly attached to one rotation center shaft 54. Therefore, if the rotation center shafts 54, 54 are rotated by this rotational force, the rotation center shafts 54, 54 will naturally rotate, but the rotation center shafts 54, 54 will naturally rotate.
4, 54 and the horizontal axis 39, the horizontal axis 39 performs a rotational movement with a radius d about the axis 54a of the rotation center shafts 54, 54,
As a result, the vertical center of the oscillating radius 40, that is, the axis 39a of the horizontal shaft 39, is moved in the longitudinal direction of the arm, and the horizontal shaft 39 and the crank pin 4
7 is slightly increased or decreased.

In the elevating device for the horizontal sealing means 10 configured in this way, the crank pin 47 performs a rotational movement drawing a circular locus with a diameter R, so that the swinging arm 40 is reciprocated in the vertical direction about the horizontal axis 39. An oscillating movement is generated, which is transmitted to the lifting rod 19, and the transverse sealing means 10 is raised and lowered together with the rod. At this time, if the crank mechanism 46 remains in a fixed position and the engagement position of the crank pin 47 with respect to the elongated hole 42 remains unchanged as shown in FIG. 4, then the swing stroke θ of the swing arm 40
Also, the lifting stroke l of the lifting rod 19 is always constant. However, if the adjusting bolt 50 is rotated using the rotary operation handle 51 and the sliding base 45 is slid using the threaded engagement between the bolt 50 and the bracket 49, the engagement of the crank pin 47 with the elongated hole 42 will be reduced. When the position is varied and the distance L of the crank pin 47 with respect to the horizontal shaft 39 is changed, and the distance L increases, the swing stroke θ of the swing arm 40 decreases, and therefore the lifting rod 19
The lifting stroke l also decreases. On the other hand, when it decreases, the shaking stroke θ and the lifting stroke 1 increase, thereby adjusting the packaging length of the package, in other words, the amount of film used for one bag in the longitudinal direction. Moreover, this adjustment is done by crank pin 4.
7 in the elongated hole 42, and simply shifts the engagement position between the two in the longitudinal direction of the swinging arm, so the rotational movement of the crank pin 47 is not inhibited. This can be done while the machine is in operation. In addition, when adjusting the amount of film used, the rotational force of the servo motor is input to the rotation center shaft 54 through the pulley 57, and this is applied to the shaft center 54a.
When the shaft 54 and the horizontal shaft 39 are rotated around , the horizontal shaft 39 performs a rotational movement with a radius d as described above due to the eccentric configuration of the shaft 54 and the horizontal shaft 39, thereby reducing the distance L between the horizontal shaft 39 and the crank pin 47. is slightly changed in accordance with the amount of rotation of the horizontal shaft 39, and the above-mentioned oscillation stroke θ and expansion/contraction stroke 1 are also slightly changed accordingly, making it possible to make small increases or decreases in the amount of film used. Even in this case, the rotational movement of the horizontal shaft 39 does not impede the oscillating movement of the oscillating link 40 or the rotational movement of the crank pin 47, so there is no need to temporarily stop the wrapping operation. Furthermore, by interlocking the servo motor with the photoelectric device 12 (shown in FIG. 1), the well-known sensor mark printed on the packaging film 1 for each length of one bag and the photoelectric device 1 are connected.
2, it is possible to automatically start the servo motor in either the forward or reverse direction and finely adjust the lifting stroke l to correct the deviation.

In addition, in the drive mechanism A of the swinging arm described above, the following effects also occur. The time directly involved in heat sealing during the vertical movement of the horizontal sealing means 10 is its downward stroke range, which is as described above. In this embodiment, the engagement between the crank pin 47 and the elongated hole 42 is used to generate the oscillating movement of the oscillating arm 40, which corresponds to the 180 degree angle range reaching point b. A certain angle α range in which the pin 47 rotates further from the bottom dead center b, and a certain angle α range until the pin 47 reaches the top dead center a are determined by the crank pin 4
7 moves almost only in the lateral direction and does not participate in the oscillating movement of the oscillating arm 40. Therefore, in this angle range, the lateral sealing means 10 remains statically at the rising end and the falling end. Therefore, if the heat sealing operation for the tube 1a is continued using the time corresponding to this 2α angle range, the lifting stroke l
The effective heat sealing time can be extended without increasing the heat sealing time. To put it simply, what could previously only be involved in heat sealing in a 180 degree angle range can now be involved in 200 degrees or more, and this lifting device and the aforementioned sub-seal It will be understood that if the means 25 is used in combination, the heat sealing time for the tube 1a can be further increased.

As described above, the present invention provides a sub-heat welding means separately from the lateral heat-welding means, and utilizes the time when the lateral heat-welding means is in the ascending process not involved in the heat sealing of the tube, and the sub-thermal welding means Since the heat welded portion of the tube is heat welded prior to the lateral heat welding means, the heat welding time is dramatically increased, the seal is perfect, and subsequent packaging errors are not caused. Moreover, since the sub heat welding means is clamped first, filling can be started earlier, and the sub The presence of heat welding means can actually shorten or speed up the lifting stroke, making it possible to design the packaging machine compactly and perform high-speed packaging.
Beneficial.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing an example of an automatic packaging machine to which the present invention is applied, Fig. 2 is a plan view of a lateral heat welding device which is an embodiment of the present invention, and Figs. 3 and 4 are the apparatus. Fig. 5 is a side view of the elevating drive unit, Fig. 6 is an enlarged cross-sectional plan view of the swinging stroke fine adjustment means, and Fig. 7 explains the swinging arm drive operation by the crank pin. FIG. Explanation of symbols: 1... Packaging film, 1a... Tube, 10... Lateral heat welding means (horizontal sealing means), 25... Sub heat welding means (sub sealing means), 25a, 25b... Sub heater, 26- 3
4... Clamping actuation means, 26, 27, 28, 38...
... Escape means, 35, 37... Holding means.

Claims (1)

[Scope of utility model registration request] In order to fill a tube-shaped packaging film with an article to be packaged and seal the upper and lower sides of the filled portion using a lateral heat-welding means, the lateral heat-welding means sandwich the tube-shaped film. an ascending drive mechanism that descends from the tube-like film and rises apart from the tube-shaped film, and a sub-thermal welding means is separately provided at an upper stage position of the lateral heat-welding means, wherein the sub-thermal welding means: a holding means for holding the sub-heater of the means at the upper stage position; and a holding means for holding the sub-heater of the means at the upper stage position; A clamping mechanism for heat welding;
and relief means for displacing the sub heat welding means from the upper position against or overriding the holding means when the lateral heat welding means is raised to the upper position. Lateral heat welding device in packaging machine.