JP4850030B2 - Sealing device and packaging machine using the same - Google Patents

Description

  The present invention relates to a sealing device and a packaging machine using the same, and more specifically, a sealing device for sealing a sealing portion of a packaging body for packaging powder, lump, and liquid contents, and a packaging for producing a packaging body using the sealing device. Related to the machine.

  2. Description of the Related Art In recent years, for example, packaging bodies for packaging powdered foods, pharmaceuticals, and the like have been developed. The package is made of a laminate film in which a polyethylene terephthalate film, an aluminum foil, a polyethylene film, or the like is laminated. The package is heat-sealed with both vertical edges (vertical seals) in the width direction of the laminate film in the shape of a palm, while the horizontal edges (one pair) of the laminate film thus formed into a cylindrical shape. The horizontal seal part) is heat-sealed. The package having such a structure is highly portable and convenient, and can be easily opened.

  As a conventional packaging machine, for example, the one described in Patent Document 1 is known. The wrapping machine of Patent Document 1 is a supply unit that supplies a laminated wrapping paper wound around a reel, a hopper that drops the contents into a pre-packaging body whose upper portion is unsealed, and a cylindrical wrapping paper A guide cylinder part attached to a vertical seal forming part for attaching a vertical edge part of a cylindrical wrapping paper, a horizontal seal forming part for attaching a horizontal edge part in the longitudinal direction, and an end part of one horizontal edge part A cutter for forming a notch and a horizontal seal cutting part for cutting a horizontal edge part to form a package.

  In addition, as the vertical seal forming portion and the horizontal seal forming portion, for example, the respective leading portions are brought close to each other by rotating around a rotation shaft provided at a substantially intermediate portion in the length direction. A pair of opening and closing arms that are separated from each other, a normally open spring that is provided between the two opening and closing arms, and that opens the opening and closing arms, and is disposed at the tip of both opening and closing arms, and sandwiches the overlapped portion of the wrapping paper A pair of sealing members that heat-seal with each other, a pair of cam followers provided at the bases of both opening and closing arms, and a truncated cone shape that is gradually inserted and removed between both cam followers and gradually increases in diameter toward the original side. This has a linear motion cam and a rod with a linear motion cam connected to the tip, and against the spring force of a normally open spring, the linear motion cam is inserted and removed between both cam followers to open and close both open / close arms. Things with air cylinders are known That.

  At the time of manufacturing the package, first, the wrapping paper is led out from the reel by the supply unit. Next, the wrapping paper is shaped into a cylindrical shape using the guide tube portion, and the vertical edge portion of the tubular wrapping paper is heat-sealed by the vertical seal forming portion to form the vertical seal portion. Then, the cylindrical sealing paper is sequentially heat-sealed at a predetermined pitch by the horizontal seal forming part to form the horizontal seal part, while the upper part is unsealed in the pre-packed body, the contents in the hopper (for example, sugar) Drop and fill. Subsequently, while sealing the upper end part of a preliminary packaging body with a horizontal seal formation part, a notch (cut) is formed in one horizontal seal part with a cutter. Subsequently, the horizontal seal portion is sequentially cut by the horizontal seal cutting portion. As a result, the package is continuously manufactured.

  Among these, when heat-sealing the overlapping part of the wrapping paper using the vertical seal forming part and the horizontal seal forming part, for example, the rod of the air cylinder is taken in and out, and the linear motion is resisted against the spring force of the normally open spring. Insert and remove the cam between both cam followers. Thereby, both the opening and closing arms are opened and closed, and the overlapping portion of the wrapping paper is heat-sealed with a predetermined set sealing pressure between the sealing members of the both opening and closing arms.

JP-A-11-263374

However, in the packaging machine of Patent Document 1, as the structure of the vertical seal forming portion and the horizontal seal forming portion, the rod of the air cylinder is taken in and out, and the direct acting cam is installed on both cam followers against the spring force of the normally open spring. It was used to open and close both open and close arms by inserting and removing between them.
That is, the adjustment of the sealing pressure of the sealing portion of the wrapping paper by the pair of sealing members has been performed using the stroke pressure of the air cylinder rod, which is difficult to control minute pressure. In addition, the air cylinder is not suitable as a driving unit for high-speed operation of the packaging machine, and it is difficult to stably obtain a sealing pressure as set in advance, and the reliability of the sealing unit of the package has been lowered.
In order to solve this problem, for example, a packaging machine that uses a servo motor instead of an air cylinder and continuously adjusts the pushing amount of the linear cam between the cam followers can be considered. However, when sealing using a servo motor, a pressure of several hundred kg is required, and a harmonic reduction gear for the servo motor is required. Therefore, in addition to the servo motor, a servo harmonic speed reducer and its controller are required, which may increase the manufacturing cost of the packaging machine.
On the other hand, a packaging machine can be manufactured at low cost by using a general-purpose three-phase AC motor and performing force control (torque control) and high-speed positioning control (vector control).

  Therefore, as a result of earnest research, the inventor has provided a cam follower at the other end of the opening and closing arm that can be rotated forward and backward as both seal forming portions of the packaging machine and provided with a sealing member at one end, and the motor is provided on the cam follower. The cam that is movable by the contact is brought into contact with the cam surface of the cam (the surface on which the cam follower is abutted), and the end of the forward movement of the cam that becomes the high torque region (high deceleration region) of the locus of the contact point of the cam follower It has been conceived that a high torque generating protrusion for demonstrating the maximum sealing pressure of the sealing portion of the wrapping paper is provided in the portion. In this way, if a cam system having a high torque region is adopted as a sealing mechanism, a general-purpose three-phase AC motor can be used without using an expensive packaging machine incorporating servo motors, harmonic reducers, controllers and other devices. The present invention has been completed by discovering that the sealing part of the wrapping paper can be heat-sealed at the same timing with high pressure.

  An object of the present invention is to provide a sealing device capable of high-speed operation at a low cost without using a conventional servo motor, a servo speed reducer, and a packaging machine using the same.

According to the first aspect of the present invention, there is provided an opening / closing arm that is rotatable about a rotation axis, and a sealing that is provided at one end of the opening / closing arm and that heat-seals by pressing the overlapping portion of the heat-sealing sheet. A member, a cam follower provided at the other end of the opening / closing arm , and a normal rotation about the cam rotation shaft, the opening / closing arm moves the rotation shaft through the abutted cam follower. A cam configured to rotate in a closing direction around the center and a motor configured to rotate the cam in a forward and reverse direction, the cam having a blade shape, and an outer arm of the cam A high-speed arm opening / closing region provided in a range of 90 ° in the positive rotation direction of the cam from the open angle position at which the cam follower abuts the cam when fully opened, and the positive rotation direction of the cam from the open angle position In the range of 90 ° to 140 ° And a high-speed return region provided in a range of 140 ° to 180 ° in the positive rotation direction of the cam from the open angle position, and the high-speed arm opening / closing region has a length thereof. The middle portion of the direction bulges in an outwardly convex arc shape, and the high torque region gradually increases in diameter toward the fast return region, and in the fast return region, the cam follower instantly hits the open angle position. When the cam follower comes into contact with a predetermined position in the high torque region, a rotation control means is provided to reversely rotate the cam. In the high-speed arm opening / closing region, the cam follower is provided. When the opening / closing arm rotates in the forward direction, the opening / closing arm rotates in the closing direction. In the high torque region, the cam rotates in the forward direction so that the opening / closing arm rotates in the closing direction in the high-speed arm opening / closing region. The opening / closing arm rotates in the closing direction slower than the moving speed, When the cam follower is in contact with the predetermined position of the high torque range, a sealing device for reverse rotation of the cam by the pivoting control means.

According to the first aspect of the present invention, when the cam is normally rotated by the motor, the opening / closing arm is rotated in the closing direction about the rotation axis. If this is continued thereafter, the cam follower reaches the end portion (high torque region / deceleration region) of the forward movement of the cam in the locus of the contact point of the cam follower appearing on the cam surface of the cam. As a result, the cam follower gradually rides on the high torque generating raised portion. At this time, the forward movement speed (the reverse movement speed is the same) of the cam by the motor is constant. Therefore, when the cam follower passes through the high torque region, a larger torque ratio (reduction ratio) is obtained between the torque of the motor and the torque of the open / close arm than before passing through this region. In other words, by providing the cam with a high torque region, the function of the reduction gear is added to the cam.

As described above, since the cam system having a high torque region (deceleration region) is adopted as the seal mechanism, for example, a general-purpose device can be used without using a sealing device incorporating devices such as a servo motor, a harmonic reducer, and a controller. By using the three-phase AC motor, it is possible to heat seal the sealing portion of the heat-sealing sheet at a high pressure and at the same timing. If a general-purpose three-phase AC motor is used, force control (torque control) and high-speed positioning control (vector control) can be performed on the cam. As a result, although it is a low-cost sealing device, even when the sealing device is operated at high speed, the frequency of occurrence of the heat-sealing sheet having an unsealed portion can be reduced.
After the cam follower reaches the end of the forward movement of the cam (the start of reverse movement) of the trajectory of the contact point of the cam follower, the motor is reversed, and the cam follower of the cam follower of the trajectory of the cam follower The open / close arm is gradually opened back to the end of reverse movement (start of normal movement).

Only one or two open / close arms may be used. In the case of a single opening / closing arm, in order to heat-seal the overlapped portion of the heat-sealing sheet, any member that abuts on the surface side opposite to the surface side that abuts on the sealing member of the heat-sealing sheet ( Wall) is required. As this contact member, for example, a frame (assembly table) of a sealing device may be used, or a member produced exclusively for this heat seal may be used. In the case of a pair of opening / closing arms, only one or both of the opening / closing arms may be rotated forward and backward about the rotation axis.
There may be at least one pair of open / close arms, and two or more pairs may be provided.
As the heat sealing sheet, for example, a laminated film in which a polyethylene terephthalate film, an aluminum foil, a polyethylene film or the like is laminated can be employed.

In the heat-sealing sheet, the heat seal portion is not limited. For example, one heat-sealing sheet may be bent from the middle position in the width direction by overlapping both end portions in the width direction of the heat-sealing sheet, and the both end portions where the heat-sealing sheets overlap may be used as a heat seal portion. .
There may be at least one sealing member for the open / close arm, and two or more pairs may be provided.
The material, shape, and size of the sealing member are not limited as long as the overlapped portions of the wrapping paper can be sandwiched with a set sealing pressure and heat sealed. For example, the sealing member bends one heat-sealing sheet from the middle position in the width direction by overlapping both end portions in the width direction of the heat-sealing sheet, and heats the overlapping end portions of the heat-sealing sheet. It may be for vertical sealing to be sealed. Moreover, the thing for horizontal sealing which heat-seals the whole area of the width direction of a heat-fusion sheet | seat so that it may orthogonally cross the both ends which this heat-fusion sheet | seat overlaps may be used. And what can perform vertical sealing and horizontal sealing simultaneously may be sufficient.

The material and size of the cam follower and cam are not limited.
The cam is a rotation cam that rotates about a rotation axis. The motor is not limited as long as the motor can move the cam forward and backward. For example, an electric motor such as a general-purpose three-phase AC motor can be employed. Also, other actuators such as a hydraulic motor may be used. The forward movement of the cam here means that the cam is moved in the heat sealing direction of the heat-sealing sheet. The reverse movement of the cam here means that the cam is moved in the heat seal releasing direction.
In order to fully automate the sealing device, among the locus of the contact point of the cam follower, the closing detection sensor for detecting that the end of the forward movement of the cam (the beginning of the reverse movement) has been reached, and the locus of the contact point of the cam follower Among them, it is necessary to provide an open detection sensor for detecting that the end of the reverse movement of the cam (the start of the forward movement) has been reached. Further, this automation requires a rotation control means for rotating the cam forward by the motor based on the detection signal from the open detection sensor and for rotating the cam reverse by the motor based on the detection signal from the close detection sensor. .

  Examples of the open detection sensor and the close detection sensor include an encoder that serves as both an open detection sensor and a close detection sensor. That is, each of the open detection sensor and the close detection sensor may be a single sensor, or may be a combined sensor having an open detection function and a close detection function.

For example, the rotation control means may be incorporated in the control unit of the sealing device, or may be provided independently.
The shape of the raised portion for generating high torque is not limited. Further, the high torque generating bulge on the cam surface of the cam is gradually raised to the end of the cam's forward movement in the locus of the contact point of the cam follower, and the high torque generating bulge is provided at the terminal portion. Also good. Or you may provide only in the terminal part of the forward movement of a cam.
The maximum sealing pressure that is applied to the overlapping portion of the heat-sealing sheet is the maximum pressure among the sealing pressures that are required when the heat-sealing sheet is heat-sealed.

According to a second aspect of the present invention, a supply portion for supplying a wrapping paper made of a heat-sealing sheet and a vertical seal portion in which the vertical edges of the wrapping paper are aligned in a palm shape are heat-sealed to provide a cylindrical spare A vertical seal forming part for forming a package, a horizontal seal forming part for forming a horizontal seal part by heat-sealing the upper and lower ends of the preliminary package in the middle of manufacturing the package, and storing the contents A content storage unit that drops a predetermined amount of the content, a content supply unit that supplies the contents dropped from the content storage unit to the preliminary packaging body, and a horizontal cutting unit that cuts the horizontal seal portions at both upper and lower ends with a cutter. In the packaging machine provided with the seal | sticker cutting part and the apparatus main body by which these are mounted, it is a packaging machine which employ | adopted the sealing apparatus of Claim 1 as said vertical seal formation part and horizontal seal formation part.

According to the second aspect of the present invention, when the cam is normally rotated by the motor in the vertical seal forming portion and the horizontal seal forming portion, the open / close arm is rotated in the closing direction about the rotation axis. If this is continued thereafter, the cam follower reaches the end of the forward movement of the cam in the locus of the contact point of the cam follower. As a result, the cam follower gradually rides on the high torque generating raised portion. At this time, the positive moving speed of the cam by the motor is constant. Therefore, when the cam follower passes through the high torque region, a larger torque ratio is obtained between the torque of the motor and the torque of the open / close arm than before passing through this region. In other words, by providing the cam with a high torque region, the function of the reduction gear is added to the cam.

As described above, since the cam system having a raised portion for generating high torque (high torque region) is adopted as the sealing mechanism, a high-cost packaging machine incorporating a device such as a servo motor or a harmonic reducer can be used. For example, by using an inexpensive three-phase AC motor, the sealing portion of the wrapping paper can be heat-sealed at a high pressure and at the same timing. If a general-purpose three-phase AC motor is used, force control (torque control) and high-speed positioning control (vector control) can be performed on the cam. As a result, the frequency of occurrence of wrapping paper having an unsealed portion can be reduced even when the packaging machine is operated at a high speed while being a low-cost packaging machine.
After the cam follower reaches the end of the forward movement of the cam in the locus of the contact point of the cam follower, the motor is reversed and the cam follower opens and closes until the end of the reverse movement of the cam in the locus of the contact point of the cam follower. It is returned while opening the arm gradually.

As the supply unit, for example, a reel around which wrapping paper is wound can be employed.
As the vertical seal forming portion and the horizontal seal forming portion, for example, a heat fusion device can be employed.
As the contents filled in the package, for example, foods such as instant coffee, instant milk, sugar, and salt, granular and powdery chemicals, and the like can be employed. Moreover, various liquid materials may be sufficient and a block-shaped material may be sufficient.
For example, a hopper or the like can be employed as the content storage unit.

As the content supply unit, for example, a metering pump or the like can be employed.
The horizontal seal cutting unit includes a cutter and cutter reciprocating means (such as an electric motor and an air cylinder) for moving the cutter laterally.
The main part of the packaging manufacturing apparatus having these supply unit, vertical seal formation unit, horizontal seal formation unit, content storage unit, content supply unit, and horizontal seal cutting unit is two sets (two stations) or three A set (three or more) or more may be mounted on the apparatus main body.

According to each invention of the sealing device according to claim 1 and the packaging machine according to claim 2 , since the system having a cam having a raised portion for generating high torque is employed as the seal mechanism, a servo motor, Even if equipment such as a harmonic reducer and controller is not incorporated in the sealing device or packaging machine, for example, a low-cost general-purpose three-phase AC motor is used, and the seal part of the heat-sealing sheet or wrapping paper is applied at a high pressure and at the same timing. It becomes possible to heat seal. As a result, even when the sealing device or the packaging machine is a low cost, even when the sealing device or the packaging machine is operated at a high speed, the frequency of occurrence of the heat-sealing sheet or package having an unsealed portion can be reduced.

  Hereinafter, the present invention will be described with reference to embodiments. Here, a packaging machine capable of continuously producing one package (improvised instant noodles) is taken as an example.

In FIG. 1, reference numeral 10 denotes a packaging machine according to Embodiment 1 of the present invention. The packaging machine 10 includes a supply unit 11 that supplies a laminated packaging paper (heat-sealing sheet) F, and the width of each packaging paper F. A vertical seal forming portion (sealing device) 13 that seals and seals a vertical seal portion 12a (FIG. 3) having both ends (vertical edge portions) in the direction of a palm-like shape, and a preliminary packaging body 12A being manufactured. The horizontal seal forming part (sealing device) 14 for forming the horizontal seal part 12b (FIG. 3) at both the upper and lower ends of the container and four types of instant noodles (content) S are stored and continuously dropped by a predetermined amount. Four hoppers (content storage units) 15, four weighing units 15A for individually weighing the four types of sparkling S supplied from each hopper 15, and four types of weighing that have been discharged from each weighing unit 15A Preliminary packaging body 12 that packs S The contents supply unit 16 to be supplied into the inside, the horizontal seal cutting unit 17 that cuts the horizontal seal unit 12b with a pair of cutters 17a, and the packaging body 12 (FIG. 5) discharged from the horizontal seal cutting unit 17 are packaged. A product discharge unit 18 that discharges to the outside of the machine 10 and an apparatus main body 19 on which these are mounted are provided.
The supply unit 11, the vertical seal forming unit 13, the horizontal seal forming unit 14, the hopper 15, the weighing unit 15A, the content supply unit 16, the horizontal seal cutting unit 17 and the product discharge unit 18 constitute a packaging mechanism 20. The packaging mechanism 20 is provided in the apparatus main body 19 in a horizontal state.

Hereinafter, the packaging machine 10 will be described in detail.
The apparatus main body 19 is a vertically long rectangular parallelepiped casing. On the front central portion of the apparatus main body 19, there is provided a supply unit 11 for supplying a laminated wrapping paper F wound around a reel 11a whose axis is horizontal through a gate-shaped support column 19a. A box-shaped upper cover 19 c is attached to the upper plate 19 b of the apparatus main body 19. At the center of the upper plate of the upper cover 19c, four hoppers 15 for putting S into the preliminary packaging body (heat-sealing sheet) 12A whose upper portion is unsealed are arranged side by side. The types S of each hopper 15 are different. On the upper plate 19 b of the apparatus main body 19, four measuring units 15 </ b> A for individually measuring the four types of glitter cut out from the corresponding hopper 15 are arranged in parallel.

  Further, a content supply unit 16 that is a substantially inverted triangular chute for forming the wrapping paper F in a cylindrical shape is provided in the upper part on the front side of the apparatus main body 19. A vertical seal forming portion 13 is provided on the upper part of the front side of the apparatus main body 19 so as to attach both end portions in the width direction of the cylindrical wrapping paper F to form a vertical seal portion (backrest portion) 12a. A cylindrical wrapping paper F is attached to the front central portion of the apparatus main body 19 at a predetermined pitch in the length direction and orthogonal to the length direction of the wrapping paper F to form a horizontal seal portion 12b. A seal forming part 14 is provided. Details of the vertical seal forming part 13 and the horizontal seal forming part 14 will be described later.

On the front side of the apparatus main body 19, immediately below the horizontal seal forming unit 14, there is provided a roller feeding means 50 that pulls the wrapping paper F downward from the supply unit 11 by pulling the wrapping paper F downward. The roller feed means 50 includes a pair of feed rollers 51 that sandwich the longitudinal seal portion 12a of the continuous package 12 before cutting in the left-right direction, and a pair of feed motors 52 that rotate the feed rollers 51 in the reverse direction. And have. A pair of feed rollers 51 are reversely rotated by the double feed motor 52. Thereby, the continuous package 12 sandwiched between the rollers 51 is pulled down at a predetermined speed. Thereby, the wrapping paper F wound around the reel 11a is derived.
Immediately below the roller feeding means 50, a horizontal seal cutting portion 17 is provided that cuts the horizontal seal portion 12 b and forms the package body 12. The horizontal seal cutting part 17 has a pair of cutters 17a and a cutting cylinder (not shown) for opening and closing both the cutters 17a. A product discharge portion 18 that discharges the packaging body 12 substantially horizontally to the outside is provided at the lower portion on the front side of the apparatus main body 19. The product discharge unit 18 is a belt conveyor, and a calibration unit (not shown) of the manufactured package 12 may be provided.
At the center of the apparatus main body 19, a control panel 39 projects from one side via a connecting arm 39 a. The control panel 39 incorporates a rotation control means 39a, which will be described later.

  Next, with reference to FIGS. 3-7, the vertical seal | sticker formation part 13 and the horizontal seal | sticker formation part 14 are demonstrated in detail. The vertical seal forming portion 13 and the horizontal seal forming portion 14 have the same basic configuration except that the longitudinal direction of each sealing member 53 is in a phase state of 90 degrees. Therefore, only the horizontal seal forming part 14 will be described here.

  As shown in FIG. 3 to FIG. 7, the horizontal seal forming portion 14 rotates forward and backward around a vertical rotation shaft 54 provided at a substantially intermediate portion in the length direction, so A pair of opening / closing arms 55 that are close to each other or separated from each other, and a pair of heat-sealing members that are provided at the front ends of both opening / closing arms 55 and that sandwich a part of the wrapping paper F with a predetermined set sealing pressure. The sealing member 53, a pair of cam followers 56 disposed at the base of both opening and closing arms 55, and both opening and closing arms 55 are rotated forward and backward about the cam shaft, respectively, and both opening and closing arms 55 are opened and closed. On one rotating cam (cam) 57 and the outer peripheral surface (cam surface) of the rotating cam 57, the opening angle position X with which the cam follower 56 contacts when the both opening and closing arms 55 are fully opened, and the cam follower when both opening and closing arms 55 are closed. 56 comes into contact with the set seat While detecting that the rotation motor (motor) 58 that rotates the rotation cam 57 forward and backward by the angle between the closed angle position Y where pressure is obtained and the cam follower 56 has reached the open angle position X, Based on the detection signal of the open angle position X from the encoder 59 (open detection sensor and close detection sensor) 59 that detects that the cam follower 56 has reached the close angle position Y, and the rotation cam 57 by the rotation motor 58. And a rotation control means 39a that reversely rotates the rotation cam 57 by the rotation motor 58 based on the detection signal of the closed angle position Y from the encoder 59.

Of the cam surface of the rotating cam 57, the portion between the open angle position X and the close angle position Y is a locus of the contact point of the cam follower appearing on the cam surface.
The rotation cam 57 gradually increases in diameter toward the reverse rotation direction of the rotation cam 57 at the outer peripheral portion thereof, whereby the rotation speed of the sealing members 53 in the proximity direction is increased. A high torque region (deceleration region) B is provided to reduce the torque. Further, in the high torque region B, the closed angle position Y is arranged at a portion excluding the end of the rotating cam 57 in the positive rotation direction.
The pivot shafts 54 of the both opening / closing arms 55 are pivotally supported via bearings 54a in the vicinity immediately below the vertical seal forming portion 13 on the front side of the apparatus main body 19. When the front parts of the two open / close arms 55 approach or separate from each other, the front part of one open / close arm 55 and the front part of the other open / close arm 55 perform an operation of approaching or leaving each other. Say.

Both open / close arms 55 are metal arms that are long in the front-rear direction of the packaging machine 10. An elongated coil spring 70 that presses both cam followers 56 against the rotating cam 57 in a biased state is laid horizontally between the vicinity of the base portions of the two open / close arms 55.
Both sealing members 53 are horizontally long and thick electric heaters.
The two cam followers 56 are pivotally supported at the base portions of the corresponding opening / closing arms 55 so as to be pivotable horizontally around a vertical pivot shaft 56b pivotally supported by the bearing 56a.

The rotation motor 58 is a general-purpose three-phase AC motor, and is fixed to a lower end portion of a vertically long fixed plate 19d provided on the rear side of the intermediate portion in the height direction of the apparatus main body 19. The rotation motor 58 of the vertical seal forming portion 13 is fixed to a portion of the fixed plate 19d immediately above the rotation motor 58 of the horizontal seal forming portion 14.
A rotation cam 57 that can rotate forward and backward along a vertical surface is fixed to a front portion of the output shaft 58a that protrudes from the front side of the packaging machine 10 of the rotation motor 58. Details of the rotating cam 57 will be described later.
A rotation ring plate 60 for detecting a rotation angle is fixed to the base of the output shaft 58a protruding from the rear side of the packaging machine 10 of the rotation motor 58. In addition, an angle sensor 62 that detects the rotation angle of the rotating ring plate 60 is provided on the rear end plate of the casing of the rotation motor 58 via the bracket 61. The encoder 59 is mainly composed of a rotating ring plate 60 and an angle sensor 62.

Here, the rotating cam 57 will be described in detail with reference to FIGS. 6 and 7.
The rotating cam 57 has a two-blade type substantially screw shape. A fitting hole 57 a for the output shaft 58 a of the rotation motor 58 is formed at the center of the rotation cam 57. Also, from the diagonal position of the central portion of the rotating cam 57, the first blade 57b and the second blade 57c are integrally formed radially outwardly, respectively. The first blades 57b and the second blades 57c are gradually curved toward the reverse direction of the rotating cam 57 as they move forward.
The sides of each of the first blades 57b and the second blades 57c in the forward rotation direction (in the range of 90 ° from the opening angle position X to the forward rotation direction of the rotation cam 57) have an intermediate portion in the length direction protruding outwardly. Both cam followers 56 become a high-speed arm opening / closing region A that moves by a predetermined distance each time the cams bulge into a circular arc shape and rotate by 1 °.

In addition, the outer peripheral portion of the first blade 57b and the second blade 57c (in the range of 90 ° to 140 ° in the forward rotation direction of the rotation cam 57 from the open angle position X) is a high torque including the closed angle position Y. Region B.
Further, the first blade 57b and the second blade 57c are side portions in the reverse rotation direction of the first blade and the second blade (in the range of 140 ° to 180 ° from the open angle position X to the rotation direction of the rotation cam 57). Is a fast return region C in which both cam followers 56 return to the open angle position X almost instantaneously. However, both the high speed return areas C are not normally used because the rotating cam 57 is reversely rotated immediately after both the cam followers 56 reach the closing angle position Y.

Next, with reference to FIG. 6 and FIG. 7, each high torque area | region B is demonstrated in detail.
In each high torque region B, the end of the rotation cam 57 in the forward rotation direction is set as a reference angular position a, and the angle position b to approximately 11 degrees in the reverse rotation direction of the rotation cam 57 is approximately 11 °. Each e is arranged. Further, the end of the rotating cam 57 of each high torque region B in the reverse rotation direction is set to an angular position f.

  Among these, each angular position d is a closed angular position Y of both the open / close arms 55 at which a predetermined set seal pressure is obtained. Further, in each high torque region B, a region having a higher torque ratio than each closed angle position Y (region of each angular position d to f) is set immediately after each cam follower 56 reaches the closed angle position Y. Is normally not used because of the reverse rotation.

  In the initial state in which the two cam followers 56 are arranged at the respective open angle positions X, when the rotary cam 57 is rotated forward at a predetermined rotational speed by the rotary motor 58, the two cam followers 56 pass through the high-speed arm opening / closing region A and are predetermined. After a time, the rotating cam 57 rotates 90 °. At this time, each cam follower 56 reaches the high torque region B, respectively. The distance between the sealing members 53 is slightly longer. This short distance is maintained until the rotating cam 57 further rotates 33 ° (in each high torque region B, the cam follower 56 existing at each angular position a reaches the angular position d (closed angular position Y)). Until 0).

  Immediately after each cam follower 56 reaches the closed angle position Y, the rotation motor 58 is immediately reverse rotated at a predetermined rotation speed, and each cam follower 56 is returned to the open angle position X. The fact that each cam follower 56 has reached the opening angle position X, the closing angle position Y, and each angle position a to f is detected by an encoder 59 incorporated in the corresponding rotation motor 58. Control of forward rotation or reverse rotation of the rotation motor 58 based on the detection signal from each encoder 59 is performed by the rotation control means 39 a of the control panel 39.

Next, with reference to FIGS. 1-7, the action | operation of the packaging machine 10 which concerns on Example 1 of this invention is demonstrated.
First, the wrapping paper F is derived from the reel 11a by the supply unit 11. Next, the wrapping paper F is formed into a cylindrical shape using the content supply unit 16, and both end portions in the width direction of the cylindrical wrapping paper F are pasted by the vertical seal forming unit 13 to form the vertical seal unit 12a. To do. Then, the cylindrical wrapping paper F is heat-sealed at a predetermined pitch in the length direction by the horizontal seal forming portion 14 to form one horizontal seal portion 12b (three-side seal).

  Specifically, in the initial state in which both the cam followers 56 are arranged at the respective open angle positions X in the vertical seal forming unit 13 and the horizontal seal forming unit 14, the rotating cam 57 is rotated forward at a predetermined rotational speed by the rotating motor 58. Move. As a result, both cam followers 56 pass through the high-speed arm opening / closing region A, and the rotating cam 57 rotates 90 ° after a predetermined time. At this time, each cam follower 56 reaches the high torque region B, respectively. The distance between the sealing members 53 is a slight distance. The short separation distance is set to 0 before the rotation cam 57 further rotates 33 ° and reaches the closed angle position Y.

Thus, when the cam follower 56 passes through the high torque region B, a large torque ratio (reduction ratio) is obtained between the rotation angle of the rotation cam 57 and the rotation angle of the both opening / closing arms 55. In other words, by providing the rotating cam 57 with the high torque region B, the function of the speed reducer is added to the rotating cam 57.
In addition, since the rotating cam system having the high torque region B is adopted as the seal mechanism here, for example, without using an expensive packaging machine 10 incorporating devices such as a servo motor, a harmonic reducer, and a controller, for example, By using an inexpensive three-phase AC motor, the vertical seal portion 12a and the horizontal seal portion 12b of the wrapping paper F can be heat-sealed at high pressure and at the same timing. If a general-purpose three-phase AC motor is used, force control (torque control) can be performed on the cam. In general-purpose three-phase AC motors, vector control is generally known in which a control current is separated into d-axis and q-axis orthogonal coordinate components for control. By using this vector control, high-speed positioning control can be performed on the cam. As a result, even when the packaging machine 10 is low-cost, even when this is operated at high speed, the frequency of occurrence of the packaging body 12 having an unsealed portion can be reduced.

  Immediately after each cam follower 56 reaches the closed angle position Y, the rotation motor 58 is immediately reverse rotated at a predetermined rotation speed, and each cam follower 56 is returned to the open angle position X. The fact that each cam follower 56 has reached the opening angle position X, the closing angle position Y, and each angle position a to f is detected by an encoder 59 incorporated in the corresponding rotation motor 58. The forward or reverse control of the rotation motor 58 based on the detection signal from each encoder 59 is performed by the rotation control means 39a of the control panel 39.

Next, S is dropped from the four hoppers 15 into the pre-packaging body 12A whose upper portion is not sealed, and filled together. Subsequently, the upper end portion of the preliminary packaging body 12 </ b> A is sealed by the horizontal seal forming portion 14. And the package 12 is continuously manufactured by cut | disconnecting the horizontal seal part 12b one by one by the horizontal seal cutting part 17. FIG. The wrapping paper F is fed by the roller feeding means 50.
The manufactured package 12 is sequentially transferred to the next packing step by the product discharge unit 18.

The present invention relates to a three-side seal packaging machine. Although the three-way seal has been on the market for quite some time, the seal mechanism has hardly been reviewed, and it has been used with various problems. Some manufacturers have a new mechanism on the market, but there are also problems such as cost and handling / durability.
Therefore, the three-side seal wrapping machine according to the present invention is a three-way seal wrapping machine that is highly stable, highly accurate, and low in cost. That is, by using a low-cost general-purpose three-phase AC motor, highly stable and ideal seal control is performed by original force control. In addition, the unique cam shape achieves a stable sealing mechanism.

It is a side view of the packaging machine which concerns on Example 1 of this invention. It is a front view of the packaging machine which concerns on Example 1 of this invention. It is an expanded side view of the sealing apparatus integrated in the packaging machine which concerns on Example 1 of this invention. It is an enlarged plan view of the open / close arm of the sealing device according to Embodiment 1 of the present invention. It is an expansion rear view of the opening-and-closing arm of the sealing apparatus concerning Example 1 of this invention. It is an enlarged front view of the rotation cam of the sealing apparatus which concerns on Example 1 of this invention. It is S7-S7 sectional drawing of FIG.

10 packaging machine,
11 Supply section,
12A Preliminary package (heat fusion sheet),
12a Vertical seal part,
12b side seal part,
13 Vertical seal forming part (sealing member),
14 horizontal seal forming part (sealing member),
15 Hopper (content storage part),
16 Contents supply section,
17 Horizontal seal cutting part,
17a cutter,
39a rotation control means,
54 pivot axis,
55 Opening and closing arm,
56 Cam follower,
57 rotating cam,
58 Rotating motor (motor),
59 Encoder (Open detection sensor, Close detection sensor),
B High torque range,
F wrapping paper (heat fusion sheet),
X open angle position,
Y closed angle position,
S Bright (contents).

Claims (2)

An open / close arm pivotable about a pivot axis;
A sealing member that is provided at one end of the open / close arm and heat-seals by pressing the overlapping portion of the heat-sealing sheet;
A cam follower provided at the other end of the opening and closing arm;
A cam configured to rotate in a closing direction about the rotation axis via the cam follower by rotating the cam about a cam rotation axis ;
A motor for rotating the cam in a forward and reverse direction,
The cam has a blade shape,
A high-speed arm opening / closing region provided in a range of 90 ° in the forward rotation direction of the cam from the opening angle position at which the cam follower contacts the cam when the opening / closing arm is fully open;
A high torque region provided in a range of 90 ° to 140 ° in the positive rotation direction of the cam from the open angle position;
A high-speed return region provided in a range of 140 ° to 180 ° in the positive rotation direction of the cam from the open angle position,
The high-speed arm opening / closing region bulges in an arc shape with an intermediate portion in the length direction facing outward,
The diameter of the high torque region gradually increases toward the fast return region,
The high-speed return region has a shape that allows the cam follower to instantaneously contact the open angle position,
When the cam follower comes into contact with a predetermined position in the high torque region, there is provided a rotation control means for reversely rotating the cam,
In the high-speed arm opening / closing region, the opening / closing arm rotates in the closing direction by the cam rotating in the forward direction,
In the high torque region, the opening and closing arm rotates in the closing direction slower than the rotation speed in the closing direction of the opening and closing arm in the high-speed arm opening and closing region by rotating the cam forward.
A sealing device that reversely rotates the cam by the rotation control means when the cam follower comes into contact with a predetermined position in the high torque region . A supply unit for supplying wrapping paper comprising a heat-sealing sheet;
A vertical seal forming part that heat seals a vertical seal part that matches both vertical edges of the wrapping paper into a palm-like shape to form a cylindrical preliminary wrap,
A horizontal seal forming part that heat seals the upper and lower ends of the preliminary package in the middle of manufacturing the package to form a horizontal seal part;
A content storage unit for storing the content and dropping a predetermined amount of the content;
A content supply unit for supplying the contents dropped from the content storage unit to the preliminary package;
A horizontal seal cutting part that cuts the horizontal seal part at the upper and lower ends with a cutter;
In a packaging machine equipped with an apparatus main body on which these are mounted,
The packaging machine which employ | adopted the sealing apparatus of Claim 1 as said vertical seal formation part and horizontal seal formation part.

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