JP2014172654A - Biting-in determination device in bag-making filling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biting-in determination device capable of excellently determining the existence of biting-in of foreign matter, by excellently detecting seal pressure of a seal body, when applying a lateral seal in a bag-making filling machine.SOLUTION: The biting-in determination device comprises: a coil spring 10 (shock absorbing means) for restraining the energy transmission to a seal body 6 from link means 12 by moving a support 4 in a relative direction to seal bodies 6 and 7 to the seal body 6 when a holding pressure by both the seal bodies 6 and 7 exceeds a preset pressure; an air cylinder 14 (negative pressure generating means) arranged in a parallel relationship with a coil spring 10 in a driving force transmission passage up to reaching the seal body 6 from the link means 12 and generating negative pressure by moving in response to a moving distance of the seal body 6 or a moving distance per unit time to the support 4 when the holding pressure exceeds the preset pressure; a pressure sensor 19 for detecting the negative pressure generated by the air cylinder 14; and control means 21 for determining the existence of biting-in of the foreign matter by both seal bodies 6 and 7 by a comparison between a negative pressure value and a preset value based on detection information from the pressure sensor 19.

Description

  The present invention relates to a biting determination device that determines whether or not a foreign object such as a chip of an article or a powdery material is bitten when a lateral seal is applied by a bag making and filling machine.

  In the conventional bag making and filling machine, the seal body position or the seal pressure at the time of sealing is detected in order to determine whether or not foreign matter is caught between the pair of sealing bodies in the horizontal sealing device. In addition, a technique for determining whether or not a foreign object is caught is known according to the approach position or seal pressure of both seal bodies.

In the case of detecting the position of the seal body, since the fluctuation range of the film thickness caused by the presence or absence of foreign matter is very small, high determination accuracy cannot be expected.
Therefore, when detecting the seal pressure of the seal body in order to increase the determination accuracy, for example, as shown in Patent Document 1 below, a load detector using a strain gauge is disposed on the seal bar, The load when the seal bar moves is detected to determine whether or not a foreign object has been caught.

Japanese Patent Laid-Open No. 7-232715

  However, since the driving force with respect to the seal bar is directly transmitted to the load detector shown in the above-mentioned Patent Document 1, there is a possibility that the load detector receives a large impact and may cause a detection failure due to a failure or the like.

  In view of the above-mentioned problems of the prior art, the present invention can detect the seal pressure of a seal body when performing a lateral seal in a bag making and filling machine, and check whether or not foreign matter is caught. It is an object of the present invention to provide a biting determination device that can perform good determination.

  The bag making and filling machine according to the invention of claim 1 includes a pair of sealing means (6, 7) for sandwiching a cylindrical film (2) enclosing an article and applying a lateral seal, and both the sealing means (6, 7). ) And a pair of support means (4, 5 etc.) and both support means (4, 5 etc.) by driving force transmitted from the drive means in cooperation with both support means (4, 5 etc.) ) And a linking means (12) for converting the sealing means (6, 7) into a movement in which the sealing means (6, 7) are moved closer to and away from each other in the relative direction of the both sealing means (6, 7). The bite judging device of the bag making and filling machine includes the following impact absorbing means (10), negative pressure generating means (14), detecting means (19), and judging means (21). The impact absorbing means (10) is configured such that the support means (4) is connected to the sealing means (6) with respect to the sealing means (6) when the clamping pressure by the sealing means (6, 7) exceeds a set pressure. , 7) to suppress the energy transmission from the linkage means (12) to the sealing means (6). The negative pressure generating means (14) is disposed in a driving force transmission path from the linkage means (12) to the sealing means (6) in parallel with the shock absorbing means (10), and When the clamping pressure exceeds a set pressure, it moves according to the amount of movement of the sealing means (6) relative to the support means (4) or the amount of movement per unit time to generate a negative pressure. The detection means (19) detects the negative pressure generated by the negative pressure generation means (14). The determination means (21) compares the negative pressure value based on the detection information from the detection means (19) with a set value to determine whether or not foreign matter has been caught by the sealing means (6, 7). judge.

According to the first aspect of the present invention, when the clamping pressure by the pair of seal means exceeds the set pressure, the energy absorption from the linkage means to the seal means is suppressed by the shock absorbing means, so that the linkage means removes the seal from the linkage means. -It is possible to suppress the impact applied to the negative pressure generating means arranged in parallel with the shock absorbing means in the driving force transmission path leading to the power means, and the detecting means connected to the negative pressure generating means. it can. Therefore, one factor that causes detection failure can be eliminated.

  Moreover, since the negative pressure is obtained according to the moving amount of the sealing means or the moving amount per unit time obtained by the negative pressure generating means arranged as described above, the negative pressure can be detected well. In addition, the presence or absence of foreign matter can be satisfactorily determined based on the detection information.

  In the invention of claim 2 premised on the invention of claim 1, the negative pressure generating means includes a cylinder (15) provided on one of the support means (4, 5 etc.) and a sealing means (6, 7). An air cylinder (14) having a piston (16) provided on the other side is provided, and the piston (16) moves in a relative direction of the pair of sealing means (6, 7) in the cylinder (15). The negative pressure is configured to change in accordance with the change in the volume of the negative pressure chamber generated.

According to the second aspect of the present invention, the negative pressure can be generated according to the movement amount of the sealing means or the movement amount per unit time by the negative pressure generation means having a simple configuration using the air cylinder.
In the invention of claim 3 based on the invention of claim 2, the detection means (19) is connected to the negative pressure chamber (18) of the air cylinder (14) via an air pipe (20).

According to the third aspect of the present invention, the negative pressure of the air cylinder can be detected by the detecting means using the air pipe having a simple configuration connected to the air cylinder.
The invention according to claim 4 which presupposes the invention of any one of claims 1 to 3, wherein the impact absorbing means (10) is an elastic body formed of a coil spring or an air spring.

  According to the fourth aspect of the present invention, energy transfer from the linkage means to both the sealing means can be suppressed by the shock absorbing means having a simple configuration using an elastic body made of a coil spring or an air spring.

  In the bag making and filling machine, the seal pressure of the seal body when the clamping pressure by the pair of seal bodies exceeds the set pressure is well detected, and the chip of the article, the powdery material, etc. It is possible to provide a biting determination device that can satisfactorily determine whether or not a foreign object is bitten.

The partial front view which shows roughly the main part of the horizontal seal | sticker means in a horizontal bag making filling machine. (A) is the sectional view on the AA line of FIG. 1, (b) (c) is the elements on larger scale of (a).

  The horizontal 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 a vertical sealing means ( 1 and a cylindrical film 2 containing articles conveyed from a supply conveyor (not shown) at a predetermined interval by the upper and lower seal bodies 6 and 7 of the horizontal sealing means shown in FIG. An apparatus for obtaining a pillow packaged product by applying a horizontal seal in the left-right direction (width direction) intersecting the conveying direction of the tubular film 2 by pinching and repeating the movement of cutting the film with a cutter (not shown). It is.

  In the main portion 1 of the horizontal sealing means, slide rods 3 (support means) are arranged on both sides in the left-right direction perpendicular to the transport direction (front-rear direction) of the tubular film 2, and the upper ends of both slide rods 3 are arranged. An upper support 4 (support means) is installed between the sections. A lower support 5 (support means) having support portions 5b for supporting the slide rod 3 on the left and right sides is arranged below the upper support 4 so that the left and right slide rods 3 can move only in the vertical direction. Has been. A hollow cylindrical guide body 4 a is disposed on the upper support 4 so as to extend downward from two locations of the upper support 4. In each guide body 4a, the suspension shaft 6a is disposed so as to be movable only in the vertical direction, and an upper seal body 6 (seal means) is disposed at the lower end of the suspension shaft 6a. Therefore, the upper seal body 6 and the lower seal body 7 (seal means) supported on the base 5a (support means) integral with the lower support body 5 are relatively opposed to each other with the conveyance path L of the tubular film 2 interposed therebetween. doing.

  Hollow cylindrical covers 8 and 9 are attached to the left and right sides of the upper support 4. A stopper 6b screwed to the upper end of the suspension shaft 6a is disposed inside the covers 8 and 9, and the upper seal body 6 is brought into contact with the guide body 4a as a support means. And the downward movement of the suspension shaft 6a is restricted. Each guide body 4a is provided with a coil spring 10 (an elastic body which is an impact absorbing means) so as to bias the suspension shaft 6a downward with a predetermined force with respect to the guide body 4a.

  Although not shown in detail in this horizontal sealing means, the upper support means including the slide rod 3 and the upper support body 4 and the lower support means including the lower support body 5 are connected to the linkage means 12. It is connected. The linking means 12 moves the upper and lower support means in the opposite vertical directions by the driving force transmitted from the driving means 11 such as a servo motor, and the upper and lower seal bodies 6 and 7 are opposed to each other in the vertical direction. It is converted into a movement that moves closer to and away from (relative direction of the pair of sealing means). The main part of the linking means 12 is a known driving force transmission mechanism including a link mechanism, a cam mechanism, a pulley mechanism, a gear mechanism, and the like. In the linking means 12 in the present embodiment, the upper and lower seal bodies 6 and 7 have a horizontal seal while moving to the downstream side in the transport direction of the tubular film 2 together with the tubular film 2 while sandwiching the tubular film 2. The function to repeat the box motion motion which gives away and is mutually separated from the cylindrical film 2 is added.

  An air cylinder 14 as a negative pressure generating means for generating a negative pressure related to the relative movement of the upper seal body 6 or the suspension shaft 6a and the upper support body 4 is disposed on the cover 9 side as the support means. Yes.

  The air cylinder 14 includes a cylinder 15 provided in a cover 9 as a support means, a piston 16 disposed in the cylinder 15, and one end side connected to the piston 16 in the cylinder 15, and the other end side. A piston rod 17 connected to a fixture 6c that fixes the stopper 6b to the suspension shaft 6a in the cover 9 is provided.

  Therefore, the piston 16 is provided on the upper seal body 6 via the piston rod 17, the fixture 6c, and the suspension shaft 6a, and the pressure for sandwiching the tubular film 2 by the pair of seal bodies 6 gradually increases. When the upper support 4 starts to approach the upper seal body 6 in the direction in which the coil spring 10 in the state of FIG. 2A is further contracted, it is arranged to start moving in the cylinder 15. That is, as shown in FIG. 2B, the piston 16 in contact with the stepped portion 15 a in the cylinder 15 is separated from the stepped portion 15 a when the clamping pressure by the pair of seal bodies 6 exceeds the set pressure. Start moving to.

  On the outer periphery of the cylinder 15, vent holes 15b and 15c communicating with the outside are provided. The vent 15b is provided at a position overlapping the step portion 15a, is connected to the pressure sensor 19 (detection means) via the air pipe 20, and the vent 15c is open to the atmosphere.

  For example, as shown in FIG. 2C, when the piston 16 moves, the negative pressure chamber 18 is sealed by the piston 16, the piston rod 17, and the cylinder 15 so that airtightness can be maintained in the cylinder 15. Therefore, the volume in the negative pressure chamber 18 increases so as to follow the increase in the movement amount H of the piston 16, and the value of the negative pressure in the negative pressure chamber 18 (the absolute value of the negative pressure) increases. . Therefore, when the clamping pressure between the upper and lower seal bodies 6 and 7 exceeds the set pressure, that is, relative movement between the upper seal body 6 and the upper support body 4 is started so as to further compress the coil spring 10. In this case, the negative pressure chamber 18 is formed.

  Further, the negative pressure chamber 18 is also formed when a lateral seal is appropriately applied to the tubular film 2 without biting foreign matter such as chippings or powders of the article. When foreign matter such as chippings or powders of articles are caught, the negative pressure chamber 18 has a larger volume than the case where a lateral seal is appropriately applied, and the value of the negative pressure in the negative pressure chamber 18. (Absolute value of negative pressure) increases.

The pressure (negative pressure) in the negative pressure chamber 18 is detected by a pressure sensor 19 and output to a control means 21 that performs drive control of a film feed, a supply conveyor, a lateral seal device, and the like.
The control means 21 compares the negative pressure value (absolute negative pressure value) based on the detection information from the pressure sensor 19 with a preset biting determination reference value (set value), and compares the negative pressure value (negative pressure). When the pressure (absolute value) exceeds the set value, it is determined that foreign matter has been caught, and when it does not exceed, it is determined that foreign matter has not been caught.

  When it is determined that foreign matter has been caught, the control means 21 generates control signals used for various measures such as leaving by display or sound or stopping drive control (stop operation). The

This embodiment has the following effects.
(1) When the clamping pressure by the pair of seal bodies 6 and 7 exceeds the set pressure, energy transmission from the linkage means 12 to the seal body 6 is suppressed by the coil spring 10 as an impact absorbing means. Accordingly, the air cylinder 14 as the negative pressure generating means disposed in parallel with the coil spring 10 in the driving force transmission path from the linkage means 12 to the seal body 6, and the air cylinder 14 is connected to the air cylinder 14. The impact applied to the applied pressure sensor 19 can be suppressed, and one factor that causes detection failure can be eliminated.

  (2) While the airtightness of the negative pressure chamber 18 is maintained, the volume of the negative pressure chamber 18 is changed using the air cylinder 14. The negative pressure chamber 18 of the air cylinder 14 is brought into an atmospheric pressure state until the clamping pressure between the seal bodies 6 and 7 reaches a set pressure and the upper support body 4 starts to approach the upper seal body 6. After starting, the volume of the negative pressure chamber 18 of the air cylinder 14 changes so as to follow the movement amount of the upper support body 4 and the upper seal body 6 so that the negative pressure increases in accordance with the volume change. Since it is configured, the difference in the negative pressure fluctuation width increases depending on whether or not foreign matter is caught. Therefore, with a simple configuration such as the air cylinder 14 or the coil spring 10, it is possible to satisfactorily determine the presence or absence of a foreign object.

(3) A simple configuration biting determination device using the air cylinder 14, the air pipe 20, and the coil spring 10 can be employed.
(4) Since the air cylinder 14 and the pressure sensor 19 installed on the upper support 4 are connected to each other by the air pipe 20, the air pipe 20 is lengthened and the pressure is applied to a position away from the heated upper seal body 6. A sensor 19 can be provided to protect the pressure sensor 19.

The present invention can be modified as appropriate in addition to the above-described embodiment without departing from the spirit of the present invention. For example, the following configuration can be employed.
As the impact absorbing means, in addition to the coil spring 10, an elastic body made of an air spring, sponge, or the like, a shock absorber or the like may be adopted. Further, as the coil spring 10 extends, the amount of shock absorption increases, and the negative pressure value (absolute value) increases so that the coil spring 10 is connected to the driving force transmission path from the linkage unit 12 to the sealing unit. May be provided.

-A negative pressure generation means may be installed in the sealing device of the bag making and filling machine according to the first embodiment or the second embodiment disclosed in JP 2012-171669 A to detect the negative pressure.
-When the piston 16 instantaneously moves in the air cylinder 14, the amount of movement of the piston 16 corresponding to the amount of movement of the seal body 6 is detected and the engagement is determined. The biting may be determined by detecting the negative pressure generated instantaneously following the magnitude of the movement speed of the piston 16 corresponding to the magnitude of the movement amount.

  -In addition to the horizontal bag making and filling machine, the biting determination device can be adopted in horizontal sealing means such as a vertical bag making and filling machine. Further, in these horizontal sealing means, the pair of sealing bodies may be brought close to and away from each other only in the opposing direction without performing the box motion motion described above.

  In addition to installing the biting determination device only on one cover 9 side of both covers 8 and 9 on the upper support 4, the biting determination device is also installed on the other cover 8 side. Also good.

  As the pressure sensor, a well-known sensor such as a pressure sensor or a capacitance type sensor that deforms the diaphragm by negative pressure and changes the resistance of the strain gauge to generate an electric signal may be employed.

  4, 5 ... support (support means), 6, 7 ... seal body (sealing means), 10 ... coil spring (impact absorbing means), 11 ... drive means, 12 ... linkage means, 14 ... air cylinder (negative pressure generation) Means), 15 ... cylinder, 16 ... piston, 18 ... negative pressure chamber, 19 ... pressure sensor (detection means), 21 ... control means (determination means).

Claims (4)

A pair of sealing means for sandwiching a cylindrical film containing an article and applying a lateral seal, a pair of supporting means for supporting both the sealing means relative to each other, and a drive means linked to the both supporting means. A bag making and filling machine provided with linkage means for converting the seal means into a movement for moving the seal means close to and away from each other in the relative direction of the seal means by means of a driving force of
When the clamping pressure by both the sealing means exceeds a set pressure, the impact that suppresses energy transfer from the linkage means to the sealing means by moving the support means relative to the sealing means in the relative direction of the sealing means. Absorption means;
The driving force transmission path from the linkage means to the sealing means is arranged in parallel with the shock absorbing means, and the amount of movement of the sealing means relative to the support means when the clamping pressure exceeds a set pressure Or negative pressure generating means that moves according to the amount of movement per unit time and generates negative pressure,
Detecting means for detecting the negative pressure generated by the negative pressure generating means;
A bag making and filling means comprising: a judging means for judging whether or not foreign matter is bitten by the both sealing means by comparing the negative pressure value and a set value based on detection information from the detecting means; Biting determination device in the machine.   The negative pressure generating means includes an air cylinder having a cylinder provided on one of the support means and the sealing means and a piston provided on the other, and the piston moves in a relative direction of the pair of sealing means in the cylinder. The biting determination device for a bag making and filling machine according to claim 1, wherein the negative pressure changes in accordance with a change in the volume of the negative pressure chamber caused by the operation.   The biting determination device for a bag making and filling machine according to claim 2, wherein the detecting means is connected to a negative pressure chamber of the air cylinder via an air pipe.   The biting determination device for a bag making and filling machine according to any one of claims 1 to 3, wherein the impact absorbing means is an elastic body made of a coil spring or an air spring.