JP2014234166A - Lateral seal device in bag-making filling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute an ultrasonic seal by optimal air spring pressure when applying a lateral seal by ultrasonic vibration and pressurization, by moving the other in the opposite direction of a seal body by one of a seal body composed of an anvil and a seal body composed of a horn.SOLUTION: A lateral seal device comprises link means 24 for making motion for moving in the carrying direction together with a cylindrical film F while mutually approaching-separating lateral seal means 12, an air cylinder 34 for energizing the other 14 of the seal body by the air spring pressure when applying the lateral seal by the ultrasonic vibration and the pressurization by moving the other 14 in the opposite direction of the seal body by the one 16 of the seal body composed of the anvil and the horn, supply means 50 for supplying pressure-adjusted air toward the air cylinder 34 so as to become preset pressure set in response to proper seal pressure in the lateral seal, a check valve 70 for allowing the outflow of the air only in the downstream side air pipe 61 direction from an upstream side air pipe 60 and depressurization means 66 for discharging the air supplied to the air cylinder 34.

Description

  The present invention relates to a horizontal sealing apparatus that performs horizontal sealing with ultrasonic waves in a bag making and filling machine.

In the bag making and filling machine, the cylindrical film is clamped from both sides by a pair of sealing bodies that move in the transfer direction while moving in the transfer direction together with the transfer of the cylindrical film, and the transfer direction of the cylindrical film is As a so-called box motion type sealing device that performs horizontal sealing along the intersecting direction, for example, a sealing device as in Patent Document 1 below is known.
In the sealing device of Patent Document 1 below, when a pair of upper and lower seal bodies heated by a heater moves in a substantially circular locus, the movement locus of both seal bodies overlaps, and the section where the movement locus overlaps. In this case, after both the sealing bodies sandwich the tubular film, the upper sealing body deforms the coil spring and performs lateral sealing.
That is, in the lateral sealing device shown in Patent Document 1, the clamping pressure (sealing pressure) at which the pair of sealing bodies clamps the cylindrical film varies within the allowable range of the appropriate sealing pressure corresponding to the amount of deformation of the coil spring. It is like that.
In addition, as a lateral sealing device employing another sealing method, as shown in Patent Document 2 below, a vibrator is vibrated by an ultrasonic oscillator, the vibration is amplified and transmitted to a horn, and a pair of seals is used. 2. Description of the Related Art An ultrasonic sealing device that melts a film at a portion where a horn as a body and an anvil contact with each other by ultrasonic vibration and pressure is known.

Japanese Patent Laid-Open No. 09-301315 JP 2012-254818 A

As described in Patent Document 1 above, both the sealing bodies are moved by the movement of the box motion so that the clamping pressure of the pair of sealing bodies fluctuates within the allowable range of the appropriate sealing pressure corresponding to the deformation amount of the coil spring. We tried to use the operating mechanism in the sealing device consisting of the link and gear from the drive source to the sealing body for the ultrasonic sealing device, but the ultrasonic sealing body is better than the case of sealing with the heat sealing type sealing body. It has been found that sealing with is likely to cause sealing failure due to fluctuations in sealing pressure.
For this reason, the coil spring is changed to an air spring as in Patent Document 2, and an electropneumatic regulator that switches the two solenoid valves based on pressure detection information to keep the air supply pressure constant. Although an attempt was made to suppress the fluctuation, it was found that when the moving direction of the pair of seal bodies is changed to the separation direction in the seal section, the spring pressure is excessively lowered and the seal pressure is insufficient.
The cause of this lack of seal pressure is that the air spring pressure tends to increase until just before the seal body moves away, so the air supply pressure is reduced by exhausting the air with the exhaust solenoid valve in the electropneumatic regulator. Therefore, it is considered that this is due to a delay in the response to switching to boosting.

  Thus, the present invention provides an air spring that is optimal when a seal body made of an anvil and a seal body made of a horn are moved in the opposite direction of the seal body and a transverse seal is applied by ultrasonic vibration and pressurization. An object of the present invention is to provide a lateral sealing device capable of performing ultrasonic sealing with pressure.

In order to achieve the above object, the present invention takes the following means.
The lateral sealing device in the bag making and filling machine according to the invention of claim 1 includes a sealing body (16) made of an anvil and a sealing body (14) made of a horn, and a cylindrical film (14, 16) is formed by both sealing bodies (14, 16). F) sandwiching means (12) for sandwiching the seal by ultrasonic vibration and pressure, and supporting means (20, 22) for supporting these seal bodies (14, 16) opposite to each other; The drive force transmitted from the drive means (23) causes the seal bodies (14, 16) to approach and separate from each other in the opposing direction of the pair of seal bodies (14, 16) via the support means (20, 22). A pair of seal bodies are disposed on the support means (20, 22) and the linking means (24) for converting the movement of the tubular film (F) in the conveying direction together with the tubular film (F). (14, 16) is a cylindrical tube When the rum (F) is held and the other seal member (14) is moved in the opposite direction by the seal member (16), the other seal member (14) is biased in a direction against the movement. An air cylinder (34), a supply means (50) for supplying air adjusted to a set pressure corresponding to an appropriate seal pressure in the lateral seal toward the downstream, and the supply means (50) The upstream air pipe (60) connected to the downstream air pipe (61) connected to the air cylinder (34) is connected, and the internal pressure of the upstream air pipe (60) is reduced to the downstream air. Only when the pressure is higher than the internal pressure of the pipe (61), the one-way valve (70) that allows the outflow of air toward the downstream side and air with a flow rate smaller than the air flow rate supplied to the air cylinder (34) Pressure release means (6 ), And it becomes equipped with a.

According to the first aspect of the invention, the sealing body (16) made of an anvil and the sealing body (14) made of a horn sandwich the tubular film (F), and one (16) of the sealing bodies is the other (14). When moving the cylindrical film (F) in the opposite direction while moving it in the opposite direction and applying a horizontal seal, one (16) of the pair of seal bodies moves the other (14) in the opposite direction. After the other body (14) tries to increase the internal pressure of the air cylinder (34) disposed on the support means (20) by the movement of the other body (14), the seal bodies (14, 16) tend to move away from each other. Since it changes, it will try to reduce internal pressure.
That is, when one of the pair of seal bodies (16) moves in the opposite direction to the other (14), the internal pressure of the air cylinder (34) tends to be higher than the set pressure, and downstream of the one-way valve (70). Even if the internal pressure of the air pipe (61) on the side becomes higher than the internal pressure of the air pipe (60) on the upstream side, the one-way valve (70) prevents back flow of air, so that the pressure is adjusted to the set pressure. Therefore, the internal pressure of the upstream air pipe (60) that has received the air can be stably maintained without unnecessary pressure adjustment. Further, since air having a flow rate smaller than the air flow rate supplied into the air cylinder (34) by the pressure release means (66) is released to the outside of the air cylinder (34), the air cylinder internal pressure is excessively increased. It is possible to suppress the air spring pressure so that the upper limit value of the range of the appropriate seal pressure is not exceeded.
In addition, after the other seal body 14 moves in the opposite direction, the internal pressure of the air cylinder tends to become higher than the set pressure, and then the movement of the seal bodies (14, 16) tends to move away and the air cylinder internal pressure is reduced. When trying to decrease, the internal pressure of the downstream side air pipe (61) is lower than the internal pressure of the upstream side air pipe (60) that has received the pressure-adjusted air. The pressure-adjusted air cannot be sent through the one-way valve (70) and is supplied to the downstream air pipe (61) and the air cylinder (34).
For this reason, it can be controlled that air cylinder internal pressure falls too much, and it can be set as the air spring pressure which does not exceed the lower limit of the range of appropriate seal pressure.

  The horizontal sealing device in the bag making and filling machine according to the second aspect of the present invention can set the set pressure of the air by the supply means (50) in the first aspect by operating the setting means (68) on the screen of the display unit. The setting pressure setting by the setting means (68) can be selected from a plurality of options by an operation switch.

  According to the second aspect of the present invention, the supply means (50) is selected from a plurality of types of set pressure options provided in the setting means (68), and is selected for a predetermined set pressure, which is suitable for horizontal sealing. Can be set to set pressure. The setting operation can be easily set by operating an operation switch on the screen of the display unit.

  Therefore, when one of the sealing body made of anvil and the sealing body made of a horn moves the other in the facing direction of the sealing body and performs horizontal sealing by ultrasonic vibration and pressurization, both sealing bodies move in the facing direction. Even if the direction changes, the air cylinder internal pressure can be adjusted to the set pressure in accordance with the change, so that a lateral seal can be applied with an appropriate seal pressure.

1 is a schematic view of a lateral seal device in a bag making and filling machine according to an embodiment.

  The bag making and filling machine according to the present embodiment forms a belt-like film drawn from an original fabric roll (not shown) into a cylindrical shape by bag making means (not shown) and transports the cylindrical film F (front and back). The cylindrical film F is vertically sealed by a vertical sealing means (not shown) along the direction), and the cylindrical film F containing articles conveyed from a supply conveyor (not shown) at a predetermined interval is horizontally sealed. By sandwiching between the pair of upper and lower seal bodies 14 and 16 in the apparatus, a horizontal seal is applied in the left-right direction (width direction) intersecting the transport direction of the tubular film F, and the lower seal body is capable of moving forward and backward in the transport path 11. 16 is a horizontal bag making and filling machine that obtains a packaged product by cutting the tubular film F with a cutter 18 embedded in 16.

In the main body 10 of the lateral seal device of the present embodiment, an upper support 20 as an upper support means for supporting the upper seal body 14 and a lower support 22 as a lower support means for supporting the lower seal body 16. The upper seal body 14 and the lower seal body 16 are arranged in a positional relationship facing each other with the conveyance path 11 of the tubular film F interposed therebetween. The upper support 20 and the lower support 22 are connected to the linking means 24. The linking means 24 moves the upper and lower support means in the opposite vertical directions by the driving force transmitted from the driving means 23 such as a servo motor, and moves the upper and lower seal bodies 14 and 16 closer to and away from each other. The movement is converted to a movement to be performed, and the upper and lower seal bodies 14 and 16 are engaged with each other and moved to the downstream side in the transport direction, and then the movement is performed to move both the seal bodies 14 and 16 apart. The main part of the linking means 24 is constituted by a known driving force transmission mechanism including a link mechanism, a cam mechanism, a pulley mechanism, a gear mechanism, and the like.
When a series of movements of the upper and lower seal bodies 14, 16 moved by the linking means 24 of this embodiment are viewed from the width direction, the lower seal body 16 moves so as to draw a circular locus, and the upper seal body 14 is roughly While moving while drawing a circular locus, the upper seal body 14 moves along the movement locus of the lower seal body 16 while being energized by an air spring described later in a section where the upper and lower seal bodies 14 and 16 mesh. It is configured. About these movements, although the kind of spring is different, it becomes the same movement as patent documents 1.
That is, when the upper and lower sealing bodies 14 and 16 move together with the tubular film F to the downstream side in the conveying direction of the tubular film F while moving close to the tubular film F, the lateral sealing device moves circularly. After the upper seal body 14 moves to the downstream side in the conveying direction while sandwiching the tubular film F with the lower seal body 16 along the movement locus along the movement locus of the seal body 16, the two seal bodies are separated from each other. A so-called box motion motion is repeated which repeats the motion of applying a horizontal seal to the tubular film F.

The horizontal sealing means 12 is configured as an ultrasonic sealing means having an upper sealing body 14 configured as a horn and a lower sealing body 16 configured as an anvil. Although not shown, the principle of operation of the sealing means is that a piezoelectric ceramic vibrates by applying a voltage to an ultrasonic vibrator in which the piezoelectric ceramic is inserted between the electrodes, and the vibration is transmitted to the three boosters 26. When the amplitude adjusted to an appropriate value by 26 is transmitted to the horn, the horn at the tip vibrates ultrasonically, so that the tubular film F is melted and joined between the horn and the anvil by ultrasonic vibration and pressure. It is. The three boosters 26 are arranged close to the center so that the horn can obtain an appropriate resonance state.
The upper seal body 14 is supported by each air cylinder 34 via slide rods 32 attached to both ends of the support member 30, and as a result, supported by the support member 30. In FIG. 1, the air cylinder 34 is schematically illustrated. The air cylinder 34 has a single cylinder type cylinder 36 installed on the upper side of the upper support 20 and a piston 38 slidably fitted in the cylinder 36, and the aforementioned slide rod 32 is connected to the piston 38. It is connected as a rod. Each slide rod 32 passes through holes formed at both ends of the upper support 20 and is arranged so as to be movable in the vertical direction with respect to the upper support 20.
The inside of the cylinder 36 which is opposite to the chamber 39 defined by the piston 38 in the cylinder 36 via the piston 38 is always opened to atmospheric pressure. When the upper and lower seal bodies 14 and 16 are separated from each other, the movement of the piston 38 is restricted by the stopper 42 so that the piston 38 does not move from the inside of the cylinder 36 to the outside. Is supported by the upper support 20.

The horizontal sealing device of this embodiment has an electropneumatic regulator 50 as a supply means and a check valve 70 as a one-way valve, and receives high-pressure air received from an air supply source P installed in a factory or the like. The electropneumatic regulator 50 is depressurized and adjusted in advance by the setting means 68 so as to be set to a set pressure corresponding to an appropriate seal pressure in the horizontal seal, and the adjusted air is disposed downstream thereof. The gas is supplied into each cylinder 36 through a check valve 70.
In addition, in each cylinder 36, when the cylinder internal pressure is higher than the atmospheric pressure, air always flows out slightly so that air having a flow rate smaller than the air flow rate supplied into the air cylinder can be discharged out of the air cylinder. A gap to be obtained is formed as the pressure release means 66.
When the pair of upper and lower seal bodies 14 and 16 mesh with each other and the internal pressure of the cylinder 36 becomes the highest, the pressure release means 66 causes the air to flow out from the gap 66 when the air supply to the cylinder 36 is stopped from the upstream side. The internal pressure of the cylinder 36 is reduced to the atmospheric pressure in about 5 seconds.

The electropneumatic regulator 50 includes an air supply solenoid valve 54 that switches between acceptability and non-acceptance of air supplied from the air supply source P, and an exhaust solenoid that performs switching as to whether or not the received air is released to the atmosphere. A pressure sensor 62 (pressure) that detects the internal pressure of the air pipe 60 connected to the upstream side of the check valve 70 while connecting the valve 56 to the exhaust port of the supply solenoid valve 54 and the supply port of the exhaust solenoid valve 56. Detection means) and a control unit 52.
Both solenoid valves 54 and 56 are two-way solenoid valves, and the solenoid valve 54 is connected to a pipe when energized, and the solenoid valve 56 discharges air to the atmosphere when energized. Further, the check valve 70 is a one-way valve, and supplies air toward the cylinder 36 only when the internal pressure of the upstream air pipe 60 is higher than the internal pressure of the air pipe 61, so that the air does not flow out to the upstream side. ing.
A control unit 52 that issues an energization command to the electropneumatic regulator 50 so that the internal pressure of the air pipe 60 is set to a set pressure. In addition, the presence / absence of a pressure abnormality due to damage to the air pipe 61 or the cylinder 36 is monitored by information obtained by the pressure sensor 64.

Each setting in the control unit 52 is possible by touching and operating a screen of a display unit (not shown), and the screen is an air spring that is optimal for laterally sealing the internal pressure of the cylinder 36 corresponding to the packaging type. In order to set the optimum pressure in the air pipe 60 to be adjusted by the electropneumatic regulator 50 as a pressure, an operation switch corresponding to the option is displayed so that the set pressure can be selected from among a plurality of options. When the operation is performed, information on the set pressure is set in the control unit 52.
Then, the control unit 52 monitors (feeds back) the difference between the set pressure related information and the information related to the internal pressure of the air pipe 60 obtained from the pressure sensor 62, and the electropneumatic so that the internal pressure of the air pipe 60 becomes the set pressure. The internal pressure of the air pipe 60 is maintained at the set pressure by a switching command for reducing, increasing or maintaining the inside of the air pipe 60 toward the air supply solenoid valve 54 and the exhaust solenoid valve 56 in the regulator 50. Is done.

Since the check valve 70 is provided, air flows out from the air pipe 60 only when the internal pressure of the cylinder 36 or the air pipe 61 is reduced with respect to the internal pressure of the air pipe 60.
As the air flows out, the internal pressure of the air pipe 60 drops below the set pressure. However, the electromagnetic valve 54 for the air supply in the electropneumatic regulator 50 is instantly opened, and the air pipe 60 has a high pressure from its upstream. Since air flows in, the internal pressure of the air pipe 60 is returned to the set pressure.
That is, at least as long as air continues to flow downstream from the check valve 70, the control of returning the lowered internal pressure of the air pipe 60 to the set pressure is continued.

Next, the operation of the above embodiment will be described.
The lower seal body 16 made of an anvil and the upper seal body 14 made of a horn hold the tubular film F in accordance with the so-called box motion movement by the linkage means 24, and the lower seal body 16 moves the upper seal body 14 in the opposite direction. It moves to the conveyance direction of the cylindrical film F, and a horizontal seal | sticker is given. At this time, since the lower seal body 16 moves the upper seal body 14 in the facing direction (upward in the drawing), the upper seal body 14 is moved by the movement of the air cylinder 34 disposed on the upper support 20. After trying to increase the internal pressure, the seal bodies 14 and 16 are moved to move away from each other, so that the internal pressure is reduced.
That is, when the upper seal body 14 moves in the facing direction (upward in the drawing) by the lower seal body 16, the internal pressure of the air cylinder 34 tends to be higher than the set pressure. At this time, even if the internal pressure of the air pipe 61 on the downstream side of the check valve 70 is higher than the internal pressure of the air pipe 60 on the upstream side, the check valve 70 prevents the back flow of air, so that the pressure is adjusted so as to become the set pressure. Thus, the internal pressure of the upstream air pipe 60 that receives the air that has been received can be stably maintained without unnecessarily regulating the internal pressure.
Further, since air having a flow rate smaller than the air flow rate supplied into the air cylinder 34 by the pressure release means 66 is released to the outside of the air cylinder 34, it is possible to suppress an excessive increase in the internal pressure of the air cylinder. The air spring pressure can be set so as not to exceed the upper limit value of the range of the appropriate seal pressure.
Further, after the movement of the upper seal body 14 in the facing direction tends to cause the internal pressure of the air cylinder to become higher than the set pressure, the movement of the seal bodies 14 and 16 to move away from each other is changed to reduce the air cylinder internal pressure. In this case, since the internal pressure of the downstream air pipe 61 is lower than the internal pressure of the upstream air pipe 60 that has received the air that has been adjusted to the set pressure, the air that has been adjusted to the set pressure is reduced. The response is not sent via the check valve 70 and is supplied into the air pipe 61 and the air cylinder 34 on the downstream side. As a result, it is possible to control that the internal pressure of the air cylinder is excessively reduced, and it is possible to obtain an air spring pressure that does not exceed the lower limit value of the range of the appropriate seal pressure.

According to this embodiment described above, the following effects can be obtained.
The lower seal body 16 made of an anvil can move the upper seal body 14 made of a horn in the opposite direction, and a horizontal seal can be applied by ultrasonic vibration and pressurization. At this time, even if the direction in which the upper seal body 14 moves in the opposite direction changes, the internal pressure of the air cylinder 34 can be adjusted to the set pressure in accordance with the change. A horizontal seal can be applied.
In addition, the time during which the pair of sealing bodies 14 and 16 sandwich the tubular film F in the above embodiment is the period of the moving range of 50/360 degrees in one packaging cycle (while the sealer makes one round). This is the time determined by sandwiching the film F and packaging 20 to 150 bags per minute. Thus, when the pair of seal bodies 14 and 16 sandwich the tubular film F, the internal pressure of the air cylinder 34 increases instantaneously as described above. However, since the check valve 70 is provided, the pressure fluctuations are increased. Is not transmitted to the air pipe 60 upstream of the check valve 70. For this reason, even if the internal pressure of the air cylinder 34 increases instantaneously, the internal pressure of the air pipe 60 upstream from the check valve 70 does not decrease and is stable at a value close to the set pressure. For this reason, the electropneumatic regulator 50 that performs feedback control so as to set the pressure information of the upstream air pipe 60 to the set pressure does not perform pressure adjustment control such as unnecessary pressure reduction and pressure increase.
In the above embodiment, the set pressure can be selected and set from a plurality of types by selecting the operation switch through the setting means 68 on the screen of the display unit. The air spring pressure can be set and changed easily. Note that the meaning of selecting the set pressure from a plurality of types includes changing the setting by inputting numerical information corresponding to the pressure to be set in the setting means.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various other embodiments can be adopted.
The present invention can also be applied to a horizontal sealing device of a vertical bag making and filling machine.
・ As a supply means, when the knob is turned, the amount of contraction of the spring changes, and the air supply pressure is packaged using a pressure adjustment valve that can change the setting of the air supply pressure according to the change in the spring pressure. Air may be supplied to the cylinder as a set pressure according to the product type. In this case, it is preferable to display with a meter or the like such that the level of the set pressure can be understood by the knob.

12 lateral sealing means (sealing means), 14 upper sealing body, 16 lower sealing body,
20 upper support (support means), 22 lower support (support means),
23 driving means, 24 linkage means, 34 air cylinder,
50 Electropneumatic regulator (supply means), 60 Air piping (upstream side),
61 Air piping (downstream side), 66 Pressure release means, 68 Setting means,
70 Check valve (one-way valve)

Claims (2)

A sealing means comprising a sealing body made of an anvil and a sealing body made of a horn, sandwiching a tubular film between both sealing bodies, and performing horizontal sealing by ultrasonic vibration and pressure;
Respective support means for supporting these seal bodies facing each other,
It is converted as a movement that moves in the conveying direction of the cylindrical film together with the cylindrical film while moving the sealing body close to and away from each other in the opposing direction of the pair of sealing bodies via the support means by the driving force transmitted from the driving means. Linkage means;
When the pair of seal bodies sandwich the cylindrical film and move the other of the seal bodies in the opposite direction by one of the seal bodies, the seal body is arranged in a direction against the movement. An air cylinder for energizing the other,
Supply means for supplying air, which has been adjusted so as to have a set pressure set corresponding to an appropriate seal pressure in the horizontal seal, downstream;
Only when the upstream air pipe connected to the supply means and the downstream air pipe connected to the air cylinder are connected, and the internal pressure of the upstream air pipe is higher than the internal pressure of the downstream air pipe, A one-way valve that allows the outflow of air toward the downstream side;
Pressure release means for releasing air having a lower flow rate than the air flow rate supplied into the air cylinder to the outside of the air cylinder;
A lateral sealing device in a bag making and filling machine. The set pressure of air by the supply means can be set by operating the setting means on the screen of the display unit, and the set pressure by the setting means can be selected from a plurality of options by an operation switch. The horizontal sealing apparatus in the bag making and filling machine according to claim 1.

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