JPH033401Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a sealing device in a bag making machine.

(Prior Art) Conventionally, a heating seal body, which is movably disposed above a fabric transfer path through which a fabric made of thermoplastic synthetic resin film is intermittently transferred, is moved up and down by a lift lever by the rotational movement of a lift cam. There is a device that is moved up and down by swinging, and heat-seals the sealed portion of the fabric when the transfer of the fabric is stopped.

In such a type in which the heating seal body is raised and lowered by the rotational movement of the lifting cam, if the raising and lowering stroke of the heating seal body is set to be large,
The lifting speed of the heating seal body increases, and the lifting lever may jump or bounce against the cam surface of the lifting cam. This jumping or bouncing phenomenon may cause noise or seal failure of the original fabric. For this reason, the lifting stroke of the heating seal body by the lifting cam has generally been set within a relatively small range.

(Problem to be solved by the invention) By the way, when the drive system of the bag making machine is stopped and the bag manufacturing operation is stopped, even if the heating seal body is set to stop at the top dead center of its vertical stroke. In some cases, the original fabric on the original fabric transfer path was deformed by the heat of the heating seal body resting at the top dead center.

(Means for solving the problem) Therefore, in this invention, a heating seal body is provided which is movable up and down above the fabric transfer path where the fabric is intermittently transferred, and an interlocking link is attached to the heating seal body. an elevator lever that is connected to the lift lever and that lifts and lowers the heating sealing body through a swinging motion; An elevating cam that lowers the heating sealing body to heat-seal the sealing part of the original fabric when stopped, and a lifting cam that lowers the heating sealing body to heat-seal the sealing part of the original fabric, and a lifting cam that moves the heating sealing body further above the top dead center of the lifting stroke of the heating sealing body and is exposed to the heat of the heating sealing body. Accordingly, the heating sealing member is configured to include a lifting cylinder that raises the heating sealing body to a rest position at a height at which the original fabric is not deformed.

(Function) Therefore, in this invention, when the drive system of the bag making machine is stopped and the bag manufacturing operation is stopped, the heating seal body is moved to the lifting cylinder until the lifting cylinder reaches the rest position further above the top dead center of the lifting stroke by the lifting cam. By being raised, the original fabric on the original fabric transfer path is prevented from being deformed by the heat of the heating sealing body.

(Example) An example of this invention will be described below with reference to the drawings.

In FIG. 7, which shows the bag making machine from the side, the raw fabric F made of thermoplastic synthetic resin film is intermittently transferred along the raw fabric transfer path from the feeding side on the right side of the figure to the feeding order on the left side. .

A first feeding device 1 is provided on the feeding side of the fabric transfer path.
is installed. The first feeding device 1 includes a plurality of endless belts 4, each of which is stretched between pairs of large and small rollers 2 and 3 that face each other on the upper and lower sides of the original fabric transfer path. The large-diameter roller 3 is rotated as the sector gear 49 rotates in the feeding direction, thereby driving the feeding belt 4, thereby moving the raw fabric F forward by a length corresponding to the bag. (to the left in FIG. 7).

In front of the first feeding device 1, a sealing device 5 is provided which includes a pair of upper and lower electric heating coil-type heating sealing bodies 6 and 7 that are movably opposed to each other above and below the material transfer path.
is installed. These upper and lower heat sealing bodies 6 and 7 are moved up and down by a lifting mechanism using a cam, and when the transfer of the original fabric F is stopped, they come into contact with the original fabric F in between, and thereby The anti-F sealing area is heated and sealed.

The elevating mechanism for the upper and lower heating seal bodies 6 and 7 will be explained according to FIGS. 1, 2, 3, and 4. Between the frame 8 of the bag making machine, as shown in FIG. , a horizontal cam drive shaft 9 is rotatably disposed in the left-right direction. A first elevating cam 10 for elevating and lowering the upper heating seal body 6 and a second elevating cam 11 for elevating and lowering the lower heating seal body 7 are mounted on the cam drive shaft 9. 9 and are arranged so as to be rotatable together with each other. In addition,
The cam drive shaft 9 is connected to the output shaft 77 of the unequal speed ratio transmission mechanism 74 by a chain 79 so as to be continuously rotated in one direction.

A lever shaft 12 parallel to the cam drive shaft 9 is rotatably disposed between the frames 8 at a position adjacent to the cam drive shaft 9 . On the axis of this lever shaft 12, as shown in FIG.
A substantially L-shaped first rotatable cam roller 13 that contacts the cam surface of the first elevating cam 10 at one end.
The lift lever 14 is fixed to the lever shaft 12 integrally with a bolt 15 at a central boss portion thereof. One end of this first elevating lever 14 is
It is connected by an interlocking link 17 to a vertical guide rod 17 which is slidably fitted into a guide tube 16 fixed to the frame 8 and supports the upper heating seal body 6 in a vertically movable manner. The upper heating seal body 6 is raised and lowered during a predetermined stroke by the rotational movement of the first elevating cam 10 in conjunction with the rotation of the cam drive shaft 9. The other end of the first lift lever 14 is pivotally connected to the tip of a rod 18a of a lift cylinder 18, which is a double-acting air cylinder. When the bag making machine is in operation, compressed air is filled in one cylinder chamber of the lifting cylinder 18, whereby the cam roller 13 of the first lifting lever 14 is pressed against the cam surface of the first lifting cam 10 with a predetermined pressure. It is starting to be retained. Furthermore, when the drive system of the bag making machine is stopped and bag manufacturing work is suspended, the lift cylinder 1
The other cylinder chamber of 8 is filled with compressed air, and the first lifting lever 14 is rotated clockwise in FIG. Then, the upper heating seal body 6
It is raised to a rest position which is further above the top dead center of the lifting stroke by the lifting cam 10 and at a height that does not thermally deform the original fabric F.

As shown in FIG. 4, on the axis of the lever shaft 12 on which the first elevating lever 14 is disposed, a cam roller 19 that comes into contact with the cam surface of the second elevating cam 11 can be rotated to the tip. A second elevating lever 20 is fitted and supported at a boss portion at its base so as to be rotatable relative to the lever shaft 12. This second lift lever 20 is always urged downward by a spring 21, and this cam roller 19
It is held in pressure contact with the cam surface of the elevating cam 11. Further, the tip end of the second lifting lever 20 is connected to a connecting piece 22 protruding from the lower surface of the lower heating sealing body 7 by an interlocking link 23. The second elevating cam 11 accompanying the rotation of the cam drive shaft 9
The lower heating seal body 7 is raised and lowered during a predetermined stroke by the rotational movement of the lower heating seal body 7. As shown in FIG. 3, the lower heat sealing body 7 is guided up and down by slides 24 provided on the lower surface of both left and right ends thereof and a slide guide 25 fixed to the frame 8.

Between the first feeding device 1 and the lower heating sealing body 7, a heat shielding plate 26 for the lower heating sealing body 7 is disposed below the fabric transfer path. As shown in FIGS. 5 and 6, this heat shielding plate 26 is guided to move along guide rods 27 that are horizontal in the front and back direction and are disposed on the left and right sides of the frame 8, and is guided by an actuating cylinder 28. It is arranged so as to be switchable between a heat shielding position facing above the sealing surface of the lower heating sealing body 7 and a standby position in which the rising of the lower heating sealing body 7 is not hindered. That is, when the lower heating seal body 7 is lowered to the bottom dead center as the bag making machine stops, the rod 28a of the operating cylinder 28 is pushed out, connecting the rod 28a and the heat shielding plate 26. The heat shielding plate 26 is moved from the standby position to the heat shielding position via the fork lever 29, thereby shielding the original fabric F from the heat of the heating sealing body 7 below.

Note that when a stop switch (not shown) of the bag making machine is activated, the upper heating seal body 6 is raised to the top dead center by the eleventh lifting cam 10, and the second lifting cam 11
When the lower heating seal body 7 has been lowered to the bottom dead center by the switch actuator (not shown) disposed on the crankshaft 58, the permission switch is actuated. 6
An electromagnetic clutch (not shown) of a control shaft 64 disposed between the control shaft 1 and the unequal speed ratio transmission mechanism 74 is turned off, an electromagnetic brake is turned on, and torque transmission from the drive motor 61 is cut off. The upper heating seal body 6 is stopped at the top dead center position by the first lifting cam 10, and the lower heating seal body 7 is stopped at the bottom dead center position by the second lifting cam 11. .

In front of the sealing device 5 described above, a feed guide roller mechanism 30 is disposed as shown in FIGS. 7 and 8. This feed guide roller mechanism 30 includes a pair of upper and lower roller shafts 31 and 32 that are continuously rotationally driven by a dedicated motor (not shown), and a predetermined position in the axial direction on the axes of these roller shafts 31 and 32. It is mainly composed of a large number of disk-shaped feed rollers 33 and 34 arranged vertically and alternately at intervals. Both upper and lower roller shafts 331,
Upper and lower feed rollers 33 rotated together with 32,
34 and both upper and lower surfaces of the web F, there is a sealed portion of the web F that is heat-sealed by the sealing device 5 in the section between the first feeding device 1 and this feeding guide roller mechanism 30. A frictional force is generated to the extent that the material does not stretch, and this frictional force allows the material F to be transported forward in the section without causing any slack in the material F.

In front of the feed guide roller mechanism 30, a seventh
As shown in the figure, the first part transports and guides the raw fabric F sent forward by the feed guide roller mechanism 30 with the raw fabric F slackened by a predetermined amount.
A guide roller 35 is rotatably disposed between the frames. In front of this first guide roller 35,
In substantially the same plane as the first guide roller 35,
A second guide roller 36 is rotatably disposed between the frames.

Both the first and second guide rollers 35 and 36
A pair of lower fixed cooling pedestals 37 and an upper water-cooled movable cooling body 38 are disposed in between, which are opposed to each other above and below the original fabric transfer path. This movable cooling body 3
8 is raised and lowered in synchronization with the upper heated sealing body 6, and when the transfer of the raw fabric F is stopped, it descends toward the upper surface of the fixed cooling pedestal 37, and actively cools the heated sealed portion of the raw fabric F. It's becoming like that.

In front of the second guide roller 36, a third guide roller 39 and a fourth guide roller 41 are arranged via a first adjustment roller 40 that is vertically adjustable.
Further, in front of the fourth guide roller 41, a fifth guide roller 42 and a sixth guide roller 44 are disposed via a second adjustment roller 43 that is vertically adjustable. A second feeding device 4 is provided on the feeding side of the original fabric transfer path located in front of the sixth guide roller 44.
5 are arranged. This second feeding device 45
In almost the same manner as the first feeding device 1, there are a pair of large and small rollers 46, which face each other on the upper and lower sides of the original fabric transport path.
A large number of endless feed belts 48 are stretched between the belts 47. And a large diameter roller 46
is rotated as the sector gear 49 rotates in the feeding direction, thereby driving the feeding belt 48, thereby transporting the raw fabric F by a length corresponding to the bag toward the cutting device 86 in front. It is becoming more and more common.

A fan-shaped gear 49 that intermittently drives the first and second feeding devices 45 to intermittently transport the original fabric F is supported at a predetermined position of the frame so as to be able to swing around a support shaft 50 at its base. There is.

The sector gear 4 is located below the raw fabric transfer path and
9, between the frames there is a chain 5
A drive shaft 52 and a driven shaft 53, which are connected by a reference numeral 1, are rotatably arranged at a predetermined interval in the front-rear direction. The drive shaft 52 is rotated around the axis while meshing with the sector gear 49 . A pinion 54 is provided. Furthermore, the roller shaft of the first feeding device 1 is linked to the driven shaft 53 by a first torque transmission mechanism 55 with a chain function, and
The roller shaft of the feeding device 45 is connected to the drive shaft 52 by a second torque transmission mechanism 56 using a chain mechanism.
are connected by. On one shaft 55a of the first torque transmission mechanism 55 and on one shaft 56 of the second torque transmission mechanism 56, a sector gear 49 rotates in the clockwise feeding direction in FIG. A pair of electromagnetic clutches and an electromagnetic brake are provided, respectively, which transmit the torque when the rotation is made, and cut off the torque transmission when the rotation is made in the counterclockwise non-feeding direction. The on/off operations of these electromagnetic clutches and electromagnetic brakes are performed by a switch actuator provided on the crankshaft 58 and a corresponding actuator switch, which will be described below.

The sector gear 49 is oscillated by a crank mechanism 57. A crankshaft 58 of this crank mechanism 57 is rotatably supported between frames. On the axis of the crankshaft 58 is a crank lever 59 that rotates together with the crankshaft 58.
is fitted at its base. The tip of the crank lever 59 and the sector gear 49 are connected by a connecting rod 60.

The crankshaft 58 of the crank mechanism 57 is linked to an output shaft 62 of a drive motor 61, which is a drive source, via an unequal speed ratio transmission mechanism 74, a reduction gear 69, and a control shaft 64.

Note that the unequal speed ratio transmission mechanism 74
The output shaft 6 of the drive motor 61 is configured such that the rotation of the drive motor 61 in the non-feeding direction is decelerated, and the rotation in the feeding direction is accelerated.
The torque of 2 is applied to the crankshaft 58 of the crank mechanism 57.
It is designed to be transmitted to

A cutting device 86 consisting of a pair of upper and lower fixed and movable cutters 87 and 88 is disposed at the feeding end of the fabric transfer path in front of the second feeding device 45, and the lower fixed cutter 87 is fixed in place on the frame.

The upper movable cutter 88 is supported so as to be movable up and down by a vertical guide rod 89 that is slidably fitted into a guide tube fixed to the frame. The lower end of this guide rod 89 is connected to one end of an L-shaped lifting lever 91 via a link rod 90. The lift lever 91 has a center portion thereof.
It is supported by a frame so as to be rotatable about an axis 92.

On the other hand, a disc-shaped eccentric cam 93 is disposed on the axis of the crankshaft 58 in a state that it is eccentric from the axis by a predetermined amount. The other end of an interlocking rod 95 having an outer ring 94 rotatably fitted around the outer periphery of the eccentric cam 93 at one end is pivotally connected to the other end of the elevating lever 91. And the second feeding device 4
After the original fabric F has been transferred by a length corresponding to the bag by 5, the movable cutter 88 is lowered toward the fixed cutter 87 while the feeding action of the second feeding device 45 is stopped. It is designed to cut the original fabric F.

In addition, in this embodiment, when using the original fabric F on which letters, pictures, etc. are printed at a predetermined pitch on the surface, the printed parts of this original fabric F are detected to prevent the stickers from shifting or cutting of the original fabric F. As shown in FIG. They are arranged on the sending side and the sending side, respectively. Each of these sensors 10
2, 103 is adapted to detect the printed portion of the original fabric F every time the original fabric F is intermittently transported by a predetermined length by the first and second feeding devices 1 and 45. A first torque transmission mechanism drives the first feeding device 1 based on a detection signal of the printed portion of the fabric F by a sensor 102 disposed on the fabric feeding side of the first feeding device 1. By turning off the electromagnetic clutch (not shown) disposed on the shaft of 55 and turning on the electromagnetic brake, the fabric feeding action of the first feeding device 1 is stopped, thereby preventing the seal deviation of the fabric F. is now being prevented.

In addition, the shaft of the second torque transmission mechanism 56 that drives this feeding device 45 is detected by the detection signal of the printed portion of the fabric F by the sensor 103 disposed on the fabric feeding side of the second feeding device 45. An electromagnetic clutch (not shown) disposed above is turned off and an electromagnetic brake is turned on, thereby stopping the web feeding action of the second feeding device 45, thereby preventing miscutting of the web F. It is becoming more and more common.

In this embodiment configured as described above, when the drive motor 61 is actuated, the control shaft 64,
The crankshaft 58 and the cam drive shaft 9 are rotated at a reduced or increased speed via the reducer 69 and the unequal speed ratio transmission mechanism 74.

When the crankshaft 58 rotates at an increased speed, the sector gear 49
is rotated at an increased speed in the clockwise feeding direction in FIG. 1, and when the crankshaft 58 rotates at a reduced speed, the sector gear 49 is rotated at a reduced speed in the opposite direction to the above-mentioned non-feeding direction.

Due to the speed-up rotation of the sector gear 49 in the feeding direction, the drive shaft 52 is rotated via the pinion 52, and the driven shaft 53, which is linked to the drive shaft 52 by the chain 51, is also rotated. be done. Then, the first feeding device 1 is driven via the first torque transmission mechanism 55, and the second feeding device 45 is driven via the second torque transmission mechanism 56, whereby the web F is moved at a high speed. The length corresponding to the large bag is transferred. In addition, the feed guide roller mechanism 30
is continuously driven by a dedicated motor, and the first
This prevents the original fabric F from sagging between the feeding device 1 and the feeding guide roller mechanism 30.

When the sector gear 49 decelerates and rotates in the non-feeding direction, the electromagnetic clutches disposed on the shafts 55a, 56a of the first and second torque transmission mechanisms 55, 56 are turned off, and the electromagnetic brake is activated. Since it is turned on, the feeding action of the first and second feeding devices 1 and 45 is stopped.

On the other hand, the cam drive shaft 9 is rotated by the rotation of the crankshaft 58, and the upper and lower heating seal bodies 6, 7 are raised and lowered by the first and second elevating cams 10, 11 of the cam drive shaft 9. . Then, while the first and second feeding devices 1 and 45 are stopped and the transfer of the original fabric F is stopped, the lower heating sealing body 7 is raised to the top dead center, and the upper heating sealing body 6 is raised to the lower heating sealing body 6. It is lowered to the bottom dead center where it comes into contact with the heated sealing body 7 with the original fabric F in between, thereby heat-sealing the sealed portion of the original fabric F.

When the bag manufacturing operation is to be stopped, when a stop switch (not shown) is activated, the upper heating seal body 6 is raised to the top dead center by the first elevating cam 10, and the second
When the lower heating seal body 7 is lowered to the bottom dead center by the lifting cam 11, the permission switch is actuated by a switch actuator (not shown) disposed on the crankshaft 58, and the drive is started for the first time. An electromagnetic clutch (not shown) of the control shaft 64 disposed between the motor 61 and the unequal speed ratio transmission mechanism 74 is turned off, an electromagnetic brake is turned on, and the drive motor 61 is turned off.
Torque transmission is cut off.

Then, the lifting cylinder 18 is activated, the rod 18a of the cylinder is pushed out, and the first lifting lever 1 is pushed out.
4 is rotated clockwise in FIG. 2 about the lever shaft 12. By this clockwise rotation of the first elevating lever, the upper heating seal body 6 rises via the interlocking link 17 to a rest position further above the top dead center of the elevating stroke by the first elevating cam 10. and held in this position. Therefore, the original fabric on the original fabric transfer path is reliably prevented from being deformed by the heat of the heating seal body 6 above.

Further, in this embodiment, the actuation cylinder 28 is actuated simultaneously with the actuation of the lifting cylinder 18, and its rod 28a is pulled back. Then, the fork lever 29 is rotated counterclockwise in FIG.
Heat sealing body 7 with heat shield plate 26 below from standby position
is moved to a heat shield position opposite above the Since the heat shielding plate 26 located at the heat shielding position shields the heat of the heating sealing body 7 below, the raw fabric F on the fabric transfer path is protected from the heat of the heating sealing body 7 below. never be deformed.

In the above embodiment, the upper and lower heating sealing bodies 6 and 7 are moved up and down so that they can approach and separate from each other to heat-seal the sealing area of the original fabric F. The structure may be such that the body is movable up and down, and a receiving member for the heating seal body is disposed below the fabric transfer path.

(Effects of the invention) As described above, according to this invention, when the drive system of the bag making machine is stopped and the bag manufacturing operation is stopped, the rest position is further above the top dead center of the lifting stroke by the lifting cam. Since the heating seal body is raised by the raising cylinder until the heating seal body is raised by the raising cylinder, it is possible to reliably prevent the fabric on the fabric transfer path from being deformed by the heat of the heating seal body. As a result, it becomes possible to set the lifting stroke of the heating seal body by the lifting cam as small as possible to slow down the lifting speed of the heating seal body, which is effective in preventing noise and sealing failure of the original fabric.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view showing the upper heating seal body raised to the top dead center by the first lifting cam, and the second figure is a side view showing the upper heating seal body being raised to the rest position by the raising cylinder. 3 is a front view showing the upper and lower heating seal bodies, FIG. 4 is a side view showing the lower heating seal body being lowered to the bottom dead center by the second elevating cam, and FIG. The figure is a front view showing the heat shielding plate of the lower heat sealing body, Fig. 6 is a side view of the same, Fig. 7 is a side view showing the entire bag making machine, and Fig. 8 is a front view showing the feed guide roller mechanism. be. 5... Sealing device, 6... Upper heating seal body,
7...Lower heating seal body, 9...Cam drive shaft, 1
0...First lifting cam, 11...Second lifting cam, 1
2... Lever shaft, 14... First elevating lever, 18
...Ascending cylinder, 20...Second elevating lever.

Claims (1)

[Scope of utility model registration request] A heating seal body disposed so as to be movable up and down above the fabric transfer path through which the fabric is intermittently transferred; and a heating seal body connected to the heating seal body by an interlocking link, and the heating seal body being moved by a rocking motion. A lifting lever that lifts and lowers the lifting lever, which contacts one end of the lifting lever and swings the lifting lever by rotational movement, and lowers the heating sealing body when the transfer of the original fabric is stopped to seal the area of the original fabric. an elevating cam that heats and seals the heated sealing body, and a rest position that is further above the top dead center of the elevating stroke of the heated sealing body by this elevating cam and at a height where the original fabric is not deformed by the heat of the heated sealing body. A sealing device for a bag making machine, characterized in that the sealing device includes a lifting cylinder that raises the heated sealing body to a position.