JPH05245953A - Hot blade support device of automatic bag making machine - Google Patents

Abstract

PURPOSE:To freely set an arbitral angle of inclination by providing a vertical shaft on a hot blade at the central position in the longitudinal direction thereof to connect the same to a hot blade driving mechanism and supporting the hot blade by the vertical shaft to make the same revolvable around the vertical shaft. CONSTITUTION:A holder 13 is fixed to a support 16 constituted as a vertical shaft at the central position in the longitudinal direction of a hot blade 1 to support the hot blade 1 by the support 16. A ball screw 17 is connected to a servo motor 18 above the hot blade 1 and a nut member 19 is fixed to a slider 20 to be threaded with the ball screw 17. The slider 20 is engaged with a guide rail 21 to be made movable in a vertical direction and, further, the support 16 of the hot blade 1 is inserted in the hole of the slider 20 to be supported in a revolvable manner. By this constitution, the hot blade 1 becomes freely revolvable around the vertical shaft 16 and, when the ball screw 17 is rotated by the servo motor 18, the nut member 19 and the slider 20 are moved to move the support 16, the holder 13, a hanger 12 and the hot blade 1 in a vertical direction. Therefore, the hot blade l can be arbitrarily inclined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bag making apparatus for producing plastic bags, and more particularly to a hot blade supporting mechanism for the same.

[0002]

2. Description of the Related Art In an automatic bag making apparatus for manufacturing plastic bags, generally, a heat blade and a receiving member are vertically opposed to each other, and plastic films are laminated in two layers.
It is passed between the hot blade and the receiving member and fed horizontally. Furthermore, the plastic film is intermittently fed by a fixed length, and the hot blade is operated by the hot blade driving mechanism every time the plastic film is intermittently fed, and the hot blade moves toward the plastic film and the receiving member. Is sandwiched between the hot blade and the receiving member, whereby the plastic film is melted and cut to manufacture a plastic bag. Also, the hot blade normally extends in the width direction of the plastic film. Therefore, the plastic film is blown in the width direction, and the plastic bag has a rectangular shape.

By the way, in this apparatus, in addition to the rectangular plastic bag, it is often required to manufacture a trapezoidal plastic bag. In order to manufacture a trapezoidal plastic bag, in a horizontal plane, the hot blade is rotated around its longitudinal center position, tilted, the hot blade is inclined at a predetermined angle, and the plastic film is cut diagonally. Good.

However, as for the hot blade of the automatic bag making apparatus, both ends thereof have been connected to the hot blade drive mechanism so far.
This supported the hot blade. Then, the hot blade was operated and moved by the drive mechanism, and the plastic film was melted and cut. Therefore, unless the entire drive mechanism is rotated around the central position in the longitudinal direction of the hot blade, it is difficult to rotate and tilt the thermal blade around the central position in the longitudinal direction due to its structure. There was a problem that there was.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention has been made in an automatic bag making apparatus for producing a plastic bag with the object of rotating a hot blade around its longitudinal center position and inclining it arbitrarily. is there.

[0006]

According to the present invention, the vertical axis is provided substantially at the center of the hot blade in the longitudinal direction and is connected to the hot blade drive mechanism. Is rotatably guided.

[0007]

Description of Embodiments Embodiments of the present invention will be described below.

In FIG. 1, this apparatus is for producing a plastic bag and has two hot blades 1,
Are arranged above the receiving member. Therefore, the thermal blade 1 and the receiving member face each other in the vertical direction. The receiving member comprises a receiving belt 2 and a receiving base 3. The receiving belt 2 is made of a fluorine resin such as polytetrafluoroethylene, is endless, extends in the horizontal direction, and is provided between a pair of rollers 4. The pedestal 3 is engaged with the roller 4 and is arranged below the upper surface of the receiving belt 2. Further, a pair of rubber rollers 5 and 6 are arranged above and below the upper surface of the receiving belt 2, and the receiving belt 2 is sandwiched between the rubber rollers 5 and 6.

Further, as shown in FIG. 2, a timing pulley 7 is provided on the rotary shaft of the upper rubber roller 5, a timing belt 8 is engaged with the timing pulley 7, and the timing belt 8 causes the rubber roller 5 and the drive motor 9 to move. Drive motor 9 and timing belt 8 are connected.
The rubber roller 5 is driven by the
Rotate clockwise. Further, the rubber rollers 5 and 6 are connected by a gear, and the rubber roller 6 is interlocked with the rubber roller 5 and rotates counterclockwise in FIG. Therefore, the receiving belt 2 is interlocked with the rubber rollers 5 and 6, travels between the rollers 4 and circulates, the plastic film 10 is sandwiched between the rubber roller 5 and the receiving belt 2, and the plastic film 10 is held by the rubber roller 5 and the receiving belt 2. Sent. The plastic film 10 is folded along the center line in the lengthwise direction and laminated in two layers, and passes between the hot blade 1 and the receiving belt 2 and is fed to the left in FIG. The receiving belt 2 is intermittently driven with a constant stroke, and the plastic film 10 is intermittently fed by a constant length.

As shown in FIG. 3, the thermal blade 1 extends in the width direction of the plastic film 10 and has a plurality of plate-shaped spacers 1.
1, the hanger 12 is fitted into the holder 13 and is connected to the suspension bolt 14. Further, the buffer composed of the air cylinder 15 is attached to the holder 13.
Attached to the hanger 12 and the hanging bolt 14
The hanger 12 is elastically supported by the air cylinder 15, and the hanger 12 and the suspension bolt 14 can be lifted against the action of the air cylinder 15. Further, the holder 13 is fixed to the vertical axis at the center position in the lengthwise direction of the hot blade 1, and the vertical axis is composed of the support columns 16,
Are supported by columns 16.

Above the hot blade 1, the ball screw 17 is connected to the servomotor 18, the nut member 19 is fixed to the slider 20, and is screwed onto the ball screw 17. The slider 20 is engaged with the guide rail 21 and can move in the vertical direction. Further, the support 16 of the thermal blade 1 is inserted into the hole of the slider 20, and is rotatably fitted and supported. Therefore, the thermal blade 1 can rotate around the column 16 at the center position in the length direction. Further, the ball screw 1 is driven by the servo motor 18.
When 7 is rotated, the nut member 19 and the slider 20
Can move along the ball screw 17 and the guide rail 21 to move the column 16, the holder 13, the hanger 12, and the hot blade 1 in the vertical direction.

Further, in this embodiment, two hot blades 1 are arranged at intervals corresponding to the length L of the plastic bag in the feeding direction of the plastic film 10. Further, the servo motor 18 and the guide 21 are attached to the side plate 22.
The side plate 22 is engaged with and supported by the guide rail 23, and the side plate 22 can be slid along the guide rail 23 and moved in the feeding direction of the plastic film 10, whereby each hot blade can be moved. The interval of 1 can be adjusted.

Further, an endless suction belt 24 is provided downstream of the hot blade 1. The suction belt 24 is a timing belt, extends in the feeding direction of the plastic film 10, is provided between a pair of timing pulleys 25, and is engaged with each timing pulley 25. Further, the suction belt 24 is arranged above the receiving belt 2, the starting end thereof overlaps the terminal end of the receiving belt 2, the lower surface 26 is located in the same plane as the upper surface of the receiving belt 2, and It is located at a height corresponding to the feed path. Further, as shown in FIG. 4, this device has six suction belts 24, which are arranged at intervals in the width direction, and the timing pulley 25 is attached to a common rotary shaft 50. Has been. The timing pulley 25 is movable along the rotary shaft 50,
It can be fixed at any position.

Further, as shown in FIG. 5, the suction belt 24
Has a large number of holes 27, and the holes 27 are formed at intervals in the length direction of the suction belt 24. Further, in each suction belt 24, a suction bar 28 is provided between the upper and lower stretches thereof, and the suction bar 28 has a series of opening grooves 29 and extends along the lower stretch of the suction belt 24, and a hose nipple. It is attached to and supported by 30, and the opening groove 29 opens along the lower stretch of the suction belt 24 and is connected to the vacuum pump via the hose nipple 30. Therefore, the opening groove 29 of the suction bar 28 can be evacuated by the vacuum pump, and thus the hole 27 of the suction belt 24 can be evacuated.

Further, the rotary shaft 5 of the timing pulley 25
No. 0 is provided with a timing pulley 31. Like the rubber roller 5, the timing belt 8 is engaged with the timing pulley 31, and the timing belt 8 connects the suction belt 24 and the drive motor 9. Therefore, the suction belt 24 is driven by the drive motor 9 and the timing belt 8, and each suction belt 24 is connected to each timing pulley 25.
The lower surface 26 of the suction belt 24 advances in the feeding direction of the plastic film 10 while circulating.

Further, six pairs of spatula 32 are attached to each suction belt 24.
The spatula 32 is arranged along both side edges of the suction belt 24 and stands by at a position above the lower surface 26 of the suction belt 24. Further, a single hanger 33 extends in the width direction of the suction belt 24 and is provided above the spatula 32. As shown in FIG. 6, a vertical axis is provided at the center position in the longitudinal direction of the spatula 32.
The vertical axis consists of a bolt 34 with a head 35, which is inserted into a hole formed in the spatula 32. Further, the nut 36 is housed in the housing groove 37 formed in the hanger 33,
The bolt 34 is screwed onto the nut 36 and tightened, and the bolt 34 and the nut 36 are used to tighten the spatula 32.
And the hanger 33 are connected and fixed. Therefore, when the bolt 34 is loosened, the nut 36 is moved to the hanger 33.
The bolt 34 can be moved in the longitudinal direction of the hanger 33 by sliding the bolt 34 along the accommodation groove 37. Spatula 3
It is also possible to rotate 2 around the bolt 34. Further, at the center position in the length direction of the spatula 32, the hanger 3
3 is fixed to the vertical shaft, and the vertical shaft is composed of a column 38, and the hanger 33 is supported by the column 38.

Above the spatula 32, a ball screw 39 is connected to a servomotor 40, and a nut member 41 is provided.
Are fixed to the slider 42 and screwed to the ball screw 39. The slider 42 is engaged with the guide rail 43 and can move in the vertical direction. further,
The column 38 of the hanger 33 is inserted into the hole of the slider 42,
It is rotatably fitted and supported. Therefore, the hanger 33 is rotatable around the column 38 at the center position in the length direction. Further, when the ball screw 39 is rotated by the servo motor 40, the nut member 41 and the slider 42 move along the ball screw 39 and the guide rail 43, and the column 38, the hanger 33, and the spatula 32 can be moved in the vertical direction. it can. The spatula 32 moves to a position below the lower surface 26 of the suction belt 24.

The spatula 32 has a length corresponding to twice the length L of the plastic bag, and is arranged at a distance corresponding to twice the length L of the plastic bag from the most downstream thermal blade 1. .. Further, like the hot blade 1, the servo motor 40 and the guide rail 43 are attached to the side plate 44, and the side plate 44
Is engaged with and supported by the guide rail 45, the side plate 44 can be slid along the guide rail 45 and moved in the feeding direction of the plastic film, and thus the position of the spatula 32 can be adjusted. ..

In addition, the apparatus has a cradle or discharge conveyor 46, and the cradle or discharge conveyor 46 is disposed below the suction belt 24 by a certain distance.

In this apparatus, when the plastic film 10 is fed by the rubber roller 5 and the receiving belt 2, the drive motor 9 is intermittently driven in a preset sequence, and the plastic film 1
0 is intermittently sent with a stroke equivalent to twice the length L of the plastic bag. Further, every time the plastic film 10 is intermittently fed, the ball screw 17 is driven and rotated by the servo motor 18, and the respective thermal blades 1 move toward the plastic film 10, the receiving belt 2 and the pedestal 3 and descend. Therefore, the plastic film 10 is sandwiched between the hot blade 1 and the receiving belt 2, the pedestal 3 receives the pressure, and the plastic film 10 is melted and cut by each hot blade 1 to manufacture a plastic bag.
Next, the ball screw 14 is driven by the servo motor 17, each hot blade 1 is raised to its original position, the plastic film 10 and the plastic bag are sent by the receiving belt 2, and then each hot blade 1 is lowered again. , The plastic film 10 is blown again. Therefore, every time the plastic film 10 is melted, two plastic bags are manufactured at the same time, and each plastic bag has a length L.
It is sent intermittently with a stroke equivalent to twice. The hot blade 1 extends in the width direction of the plastic film 10, and the plastic film 10 is melted and cut in the width direction. Therefore, as shown in FIG. 7, the plastic bag has a rectangular shape.

Further, when the plastic film 10 and the plastic bag are sent by the receiving belt 2,
The suction belt 24 is driven by the drive motor 9 and the timing belt 8. Therefore, each suction belt 24
Is synchronized with the receiving belt 2 and the length L of the plastic bag is 2
The lower surface 26 is driven intermittently with a stroke equivalent to double, and the lower surface 26 advances in the feeding direction of the plastic film 10. The spatula 32 has risen to a position above the lower surface 26 of the suction belt 24 and stands by at that position. Further, in the area of the suction bar 28, the holes 27 of the suction belt 24 are evacuated by the suction bar 28, and when the plastic bag reaches the end of the receiving belt 2, the plastic bag is adsorbed to the lower surface 26 of the suction belt 24. A plastic bag is sent by each suction belt 24.

Therefore, each time the suction belt 24 is driven intermittently, two plastic bags are adsorbed by the suction belt 24 and sent to the position of the spatula 32. Thereafter, when the plastic film 10 is melted and cut by the hot blade 1, the ball screw 39 is driven and rotated by the servo motor 40, and each spatula 32 moves to a position below the lower surface 26 of the suction belt 24 and descends. , The spatula 32 pushes down the plastic bag. Therefore, each spatula 32 has 2
Engage with one plastic bag, the two plastic bags are pushed down simultaneously and away from the suction belt 24 and fall onto the cradle or discharge conveyor 46. Then, the ball screw 39 is driven by the servo motor 40, and the spatula 32
Ascends to its original position and waits.

Then, the above-mentioned steps are sequentially and alternately repeated. Therefore, the plastic film 10 is melted and cut by each hot blade 1, and two plastic bags are manufactured at the same time every melting, and the plastic bags are sent by the suction belts 24, and each plastic bag is transferred to the cradle or the discharge conveyor 46. It will fall and be stacked.
Thereafter, a predetermined number of plastic bags fall onto the cradle or discharge conveyor 46, and when stacked, the plastic bags are removed from the cradle or discharge conveyor 46.

Further, as described above, the hot blade 1 of this device
For, each hot blade 1 can be swiveled around its strut 16. For the spatula 32, the hanger 3
3 can be swiveled around the column 38. Each bolt 34 can be moved in the length direction of the hanger 33, and each spatula 32 can be rotated around each bolt 34. Therefore, as shown in FIG.
Can be rotated around its support 16 and tilted in the opposite direction, and the plastic film 10 is melt-cut by each hot blade 1, whereby a trapezoidal plastic bag can be manufactured. In this case, two plastic bags are simultaneously manufactured for each fusing, and they have a trapezoidal shape, but they are not the same shape. Inverted plastic bags are manufactured one by one. Further, the hanger 33 can be rotated around the column 38 and tilted so as to correspond to the shape of the plastic bag, each bolt 34 is moved in the length direction of the hanger 33, and each spatula 32 is attached to each bolt 34. Rotate around,
This allows the position and orientation of each spatula 32 to be adjusted. Therefore, even with a trapezoidal plastic bag, when the plastic bag is fed by the suction belt 24, each spatula 32 can be engaged with the plastic bag and the plastic bag can be accurately pushed down.

Therefore, even in the case of trapezoidal plastic bags, when the manufactured plastic bags are taken out, there is no possibility that the respective plastic bags are inclined in various directions as in the conventional case. Further, in this case, the plastic bags having the opposite shapes are alternately adjacent to each other, and the respective plastic bags are fed in that state.
In the spatula 4, the spatula 32, and the cradle 46, two plastic bags are alternately fed and drop at two positions.
Therefore, plastic bags having the same shape can be automatically stacked and aligned at the two positions.

Not only trapezoidal plastic bags but also other deformed plastic bags can be manufactured, and the plastic bags can be automatically aligned and stacked. Further, when the plastic films 10 having different widths are fed and the plastic film 10 is used to manufacture a plastic bag, the timing pulley 25 of the suction belt 24 is moved along the rotary shaft 50, and each suction belt 2
The spacing of 4 may correspond to the width of the plastic film 10.

9 and 10 show another embodiment. In this embodiment, a plurality of spatulas 32 are arranged along one side edge of each suction belt 26, a shelf 47 is formed on one side surface of each spatula 32, and a plurality of suction pads 48 are attached to each shelf 47. The suction pads 48 are arranged at intervals in the length direction of the spatula 32. Therefore, the spatula 32 and the suction pad 48 engage with each plastic bag, and the spatula 32 and the suction pad 48 push down the plastic bag. Further, the vacuum pump and the compressor are connected to the suction pad 48 via the flexible tube 49, and when the plastic bag is pushed down, the suction pad 48 is evacuated by the vacuum pump and the plastic bag is adsorbed to each suction pad 48. It Therefore, it is possible to reliably push down each plastic bag. Then, the compressed air of the compressor is sent to each suction pad 48, and each plastic bag separates from the suction pad 48 and falls. Each suction pad 48 is housed in the long groove of the shelf 47, and when the trapezoidal plastic bag is sucked, the suction pad 48 is slid along the long groove of the shelf 47 and moved in the length direction of the spatula 32. The position of each suction pad 48 can be adjusted.

In the embodiment shown in FIGS. 1 and 9,
It is not always necessary to use the suction belt 24. Instead of the suction belt 24, an electrostatic belt may be used, and a plastic bag may be attached to the lower surface of the electrostatic belt.

Further, instead of the two hot blades 1, for example, three hot blades 1 may be arranged at intervals corresponding to the length of the plastic bag in the feeding direction of the plastic film 10. Then, when the plastic film 10 is intermittently fed with a stroke corresponding to three times the length L of the plastic bag and the plastic film 10 is melt-cut by each hot blade 1, three plastic bags are simultaneously manufactured for each melt-cut. be able to. In short, n heat blades 1 are arranged in the feeding direction of the plastic film 10 at intervals corresponding to the length L of the plastic bag, and the plastic film 10 has a stroke corresponding to n times the length L of the plastic bag. You can send it intermittently. And the plastic film 1 by each hot blade 1
By fusing 0, n plastic bags can be manufactured simultaneously.

Further, when n plastic bags are manufactured at the same time, the spatula 32 has a length corresponding to n times the length L of the plastic bag, and the spatula 32 is moved from the most downstream thermal blade 1 to the plastic bag. They are arranged at intervals corresponding to the length L or intervals corresponding to a plurality thereof. Then, the suction belt 24 or the electrostatic belt is intermittently driven with a stroke corresponding to n times the length L of the plastic bag, and the spatula 32 is moved below the lower surface 26 of the suction belt 24 or the electrostatic belt at each intermittent driving. Position, the spatula 32 is engaged with the n plastic bags,
The plastic bags can be pushed down at the same time and dropped. The length of the spatula 32 referred to here is an effective length for engaging the plastic bag. The actual length may be greater than n times the length L of the plastic bag. The position of the spatula 32 is adjusted to the left and right in FIG. 1, and the effective length for engaging the plastic bag is the length L of the plastic bag.
It may be set to correspond to n times.

The same applies to the suction pad 48. When manufacturing n plastic bags at the same time, multiple suction pads 4
8 is provided in a length region corresponding to n times the length of the plastic bag, and the region is provided from the most downstream thermal blade 1 at an interval corresponding to the length L of the plastic bag or an interval corresponding to a plurality thereof. You can select it. Then, when the suction belt 24 or the electrostatic belt is intermittently driven with a stroke equivalent to n times the length L of the plastic bag, n plastic bags are attracted to each suction pad 48 at each intermittent driving, and n The plastic bags can be pushed down at the same time and dropped. The length area of the suction pad 48 is an effective length area that engages with the plastic bag, and is similar to the effective length of the spatula 32.

It is also conceivable that the plastic bag is pushed down and dropped only by the suction pad 48 without using the spatula 32.

[0033]

As described above, according to the present invention, the thermal blade 1 can be rotated around the vertical shaft 16. Therefore, in the horizontal plane, the thermal blade 1 can be rotated around its longitudinal center position and can be arbitrarily tilted, and in addition to the rectangular plastic bag, a trapezoidal plastic bag can be manufactured. it can. It is not necessary to rotate the entire drive mechanism around the central position in the lengthwise direction of the thermal blade 1 as in the conventional case, the work is easy, and the intended purpose can be achieved. ..

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of the rubber roller of FIG.

FIG. 3 is a front view of the hot blade and the receiving belt of FIG.

FIG. 4 is a front view of the suction belt and spatula of FIG.

5 is a cross-sectional view of the suction belt and the suction bar of FIG.

6 is an enlarged cross-sectional view of the spatula of FIG.

FIG. 7 is an explanatory view showing a state where a rectangular plastic bag is manufactured by the apparatus of FIG.

FIG. 8 is an explanatory view showing a state where a trapezoidal plastic bag is manufactured by the apparatus of FIG.

FIG. 9 is a front view showing another embodiment.

FIG. 10 is a side view of the spatula and suction pad of FIG.

[Explanation of symbols]

 1 Heat Blade 2 Support Belt 3 Support 10 Plastic Film 16 Support 17 Ball Screw 18 Servo Motor

Claims (1)

[Claims] 1. A hot blade and a receiving member are vertically opposed to each other,
A plastic film laminated in two layers is sent between the hot blade and the receiving member, and the hot blade driving mechanism moves the hot blade toward the plastic film and the receiving member, and the plastic film is moved to the hot blade. In a device which sandwiches between the receiving members and thereby melts and cuts the plastic film to manufacture a plastic bag, a vertical axis substantially provided at the center position in the longitudinal direction of the hot blade is used as the hot blade driving mechanism. While connecting
A hot-blade support mechanism for an automatic bag-making device, wherein the hot-blade is supported by the vertical shaft and is guided rotatably around the vertical shaft.