JPH0513908U - Liquid heat sealer for automatic packaging machine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] There is no mutual phase relationship with disturbances, and a single cam surely enhances the contact and separation movement of a pair of rotating bodies through link means. Guide with accuracy. [Structure] The guide means includes heat seal protrusions 14 and 15
While the circular arc-shaped seal surface is in contact, the cam means 19 having the cam 19a provided with a lift corresponding to the displacement amount of the seal surface from the circumferential trajectory around the localization rotation center P, and the cam follower contacting the cam The body is pivotally supported at the lower end, and the stereotactic pivot shaft 32 is provided at the middle portion.
Long link 3 that is pivotally supported by one of the rotating bodies 10a.
3 and a short link 36 whose lower end is pivotally supported by the other orientation pivot shaft and pivotally supports the other rotating body, and is connected to the upper ends of these links and connected to each other by a connecting pin 39 in a ∧ shape to move the pin. It is composed of symmetrical bridging links 41, 42 vertically guided by a linear movement guide rail W ₃ on the route,
The cam means is driven at an angular velocity of 1 / N of the rotational angular velocity of the rotating body (the number N of heat-sealing protrusions).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a submerged heat seal device in an automatic packaging machine.

[0002]

[Prior Art]

 First, referring to FIG. 1, the automatic packaging machine 1 which is the object of the present invention, the strip-shaped packaging film 2 which is wound in a roll shape is continuously supplied to the forming pipe 4 by the roller supply device 3 and wound into a tubular shape. In the closed state, the overlapping portions on both sides are sealed by the vertical heat sealing means 5 to form the tubular packaging film T. Next, the automatic packaging machine 1 laterally seals at a predetermined pitch by a heat sealing device 10 provided below the roller supply device 3 of the machine base F, and after being closed in a tube shape, is filled with the liquid filler. Those that are supplied in advance from a chute (not shown) and are held in a liquid column state are sequentially sectioned and packaged, and then separated by a cutter 6 into individual bags.

As shown in FIGS. 2 to 4 (b), the heat sealing device 10 of the present automatic packaging machine rotates at equal circumferential speeds in the opposite directions indicated by arrows X and Y by the servomotors 11M and 12M with reduction gears. It is composed of a pair of rotating bodies 10a and 10b of the same shape that are moved. The rotating bodies 10a and 10b are rotary wheels composed of a pair of substantially circular end plates 11a and 12a and hollow shafts 13 and 13a which are rotated by motors 11M and 12M and fixedly connected to the pair of end plates 11a and 12a. 11 and 12, and six heat seal protrusions 14 and 15 are arranged on the outer peripheral portions of the rotating wheels 11 and 12 at a predetermined seal pitch interval, for example, at 60 ° center angles. There is. These heat seal protrusions 14 and 15 are formed of a cylindrical body having a cavity into which the electric heater H is inserted, and an insertion hole h for a temperature detector such as a thermocouple is formed in the outer wall portion. ing. The conductor wire is inserted into the cavity of the hollow rings 13 and 13a.

One of the rotating bodies 10a has a structure in which the cylindrical body 14 is elastically supported, and the guide opening 11b radially formed on the outer peripheral portions of the pair of left and right end plates 11a, 11a has a cylindrical shape. Both ends are guided so as to be movable in the radial direction, and the cylindrical body 14 is biased radially outward by a pair of springs 16, 16 held by a sleeve 13b fixed to the hollow ring 13 to elastically support it. is doing. Each cylindrical body 14 is regulated by the outer end of the guide opening 11b so that the outermost peripheral portion of the arcuate sealing surface is inscribed in the same circle C ₁ .

The other rotating body 10b has a structure in which the cylindrical body 15 is fixedly supported, and the outermost peripheral portion of the arc-shaped sealing surface is provided between the pair of left and right end plates 12a, 12a by means of a bolt or the like. It is fixed so as to be installed in the same circle C ₂ having the same diameter as the circle C _{1 of} 10 a.

In the pair of rotating bodies 10a and 10b having the above-described structure, the distance L between the respective rotations is such that the rotation center O₁, O₂Radius R from the outermost point of the heat seal protrusions 14 and 15 to ₁ , R₂The basic position is set to be shorter than the sum of the above, and the heat seal protrusions 14 and 15 are not in contact with each other during operation while maintaining a substantially constant contact force. Circulation trajectory C of time₁, C₂When the abutment is completed, the rotation locus C corresponding to the above circle is reached.₁, C₂It is provided on the machine base F so as to be displaced by the cam means 17 and 18 so as to be returned to. The sealing action length l of the heat seal protrusions 14 and 15 can be adjusted by appropriately changing the shape of the contact portion.

The cam means 17 and 18 can take various forms, but for simplicity of explanation, the rotation center O of the rotating bodies 10a and 10b is simple.₁, O₂6 can be constituted by a groove cam that slidably inserts into the grooves 17a, 18a having the shape shown in FIG.₁, P₂It is configured to be driven to rotate around. The shapes of the cam grooves 17a and 18a are such that when the protrusions 14 and 15 are not in contact with each other (indicated by A in FIG. 2), the circumferential trajectory C₁, C₂Rotation trajectory C (see B in FIG. 2) after₁, C₂The center of rotation O₁, O₂The space is enlarged, and the protrusions 14 and 15 have the rotation center O.₁, O ₂ The maximum displacement is made by moving on the line connecting the lines (shown by C in FIG. 2. At this time, the center of rotation is O ′.₁, O '₂Move to. ), The distance between the centers of rotation is reduced, and the contact ends (indicated by D in FIG. 2).₁, C₂The rotating bodies 10a and 10b are guided so as to return to the above. While the arc-shaped sealing surfaces of the heat seal protrusions 14, 15 are in contact with each other, the elastic force of the springs 16, 16 acts so that one protrusion 14 exerts a constant pressing force on the other 15. It goes without saying that the shapes of the cam grooves 17a and 18a of the cam means 17 and 18 are determined.

Next, referring to FIGS. 2 and 9, a rotary drive mechanism for the rotating bodies 10 a, 10 b and the cam means 17, 18 which is the object of the present invention to be improved will be described. Electric motors 11M and 12M with small reduction gears, which are controlled by a synchronous drive control circuit and the like, are directly connected to the shaft ends of the hollow shafts 13 and 13a of the rotating bodies 10a and 10b, respectively. Bearings B ₁ and B ₁ that rotatably support the hollow shafts 13 and 13a between the moving centers O ₁ and O ₂ while rotating at the same phase at a constant speed (matching the moving speed of the packaging film T). It is guided by a linear way W _{1 so} that it can be reciprocated on the line connecting them. Motor 11M, which is supported for reciprocal on a line connecting the center O _1, O ₂ 12M even through their abutment B _1, B ₂ in the linear ways W _2.

Further, the servomotors M ₁ and M ₂ with a speed reducer around the fixed position centers P ₁ and P ₂ maintain the phase relationship of the rotating bodies 10a and 10b and the angular velocity in FIG. The cam means 17 and 18 are synchronously rotated by the control circuit to control the positions of the movement centers O ₁ and O ₂ of the hollow shafts 13 and 13a at the other shaft ends by the cam grooves 17a and 18a. Is configured.

[0010]

[Problems to be solved by the device]

The rotary drive mechanism for the rotary body and the cam means controls the rotary bodies 10a and 10b and the cam means 17 and 18 by individual rotary drive sources (motors 11M, 12M, M ₁ and M ₂ ) for synchronous drive control. Since the circuit performs synchronous control, it has a problem that it is weak against electrical and mechanical disturbances and the sync phase relationship is easily broken. Also, the number of relatively expensive motors used was large.

[0011]

[Means for Solving the Problems]

 The present invention provides the guide means for guiding the separation and contact movement of the rotating bodies as described in the description of the prior art by using the seal surface from the circumferential trajectory while the arc-shaped seal surface of the heat seal protrusion is in contact. At one end, and a cam follower that abuts on the cam, and a cam follower that abuts on the cam. A long link that is rotatably supported, and one end is swingably supported by the other positioning pivot that is symmetrical to the positioning pivot with respect to the film moving path and is symmetrical with the one rotating body. A short link that is rotatably supported about the other rotating body at a position, and one end of each of the long link and the short link that is pivotally supported at one end and the other end is connected to each other in a ∧-shape. The shaft is vertically moved by the linear movement guide member on the film movement path. The above-mentioned cam is rotatably driven so that the rotational angular velocity thereof is 1 / N of the number N of the heat-seal protruding portions with respect to the rotational angular velocity of the rotating body. There is. The purpose is to reliably guide the contact and separation movements of a pair of rotating bodies with a single cam via link means without causing mutual phase relation to disturbance.

[0012]

【Example】

 Guide means for guiding the above-mentioned separation / contact movement of the rotating bodies 10a, 10b in the heat seal device 10 of the automatic packaging machine 1 described in the prior art, and rotational driving of the rotating body and the cam means incorporated therein. The mechanism and the mechanism will be described mainly with reference to FIGS.

The guide means is provided with a lift corresponding to the position of displacement of the sealing surfaces from the circumferential trajectories C ₁ and C ₂ while the arc-shaped sealing surfaces of the six heat sealing protrusions 14 and 15 are in contact with each other. Is a rotary cam means 19 having a cam (specifically formed as a cam groove) 19a which is provided around the fixed position rotation center P over 360 °, and a constant spring (not shown in the drawing) to the cam 19a. The rotator 31 of the cam follower, which is urged to abut by (omitted), is pivotally supported at the lower end, and is pivotally supported by the machine base F by the localization pivot shaft 32 at the intermediate portion to rotate one rotating body 10a. A bracket-shaped long link 33 that is pivotally supported at the center O ₁ (O ′ ₁ ) and the other orientation pivot that is symmetrical to one orientation pivot 32 with respect to the vertical movement path of the film T. The lower end is swingably supported on the machine base F by the shaft 35, and A bracket-shaped short link 36 that rotatably supports the other rotary body 10b at a position symmetrical with the rotary body 10a at a center O ₂ (O ′ ₂ ), and a lower end at each upper end of the long link 33 and the short link 36. Is pivotably connected by pins 37, 38, and is pivotally connected by a connecting pin 39 in a ∧ shape at the upper end, and the connecting pin 39 is a linear movement guide rail W ₃ on the vertical movement path of the film T. The cam means 19 has a rotational angular velocity of ⅙ of the rotational angular velocity of the rotors 10a and 10b (heat seal protrusion). The number of the parts 14 and 15 is N = 6).

The rotary drive mechanism (the gears G _{1 to} G ₁₃ are shown by broken lines) of the rotating body and the cam means includes a servomotor Mo mounted on the machine base F, and a small gear G ₁ with an output shaft thereof. A large gear G ₂ meshed with this and pivotally supported on the machine base F, and a small gear G ₄ meshed with this and fixed to the cam means 19 pivotally supported on the machine base F, The cam means 19 is rotationally driven in the direction of arrow Z.

The rotary drive mechanism further fixes a small gear G ₃ coaxially with the large gear G ₂ , and an idler gear G ₅ meshed with the small gear G ₃ and pivotally supported by a machine base F. A large gear G ₆ meshed with this and pivotally supported by the stereotactic pivot 32, a small gear G ₇ coaxially fixed to this, and an idler gear meshed with this and pivotally supported by a long link 33. G ₈ and a gear G ₉ meshed with the gear and fixed to the rotary body 10 a move the rotary body 10 a in the direction of arrow X at 1/6 of the rotational speed of the cam means 19 (gear ratio of G _{2 to} G _9). It is designed to rotate).

The rotary drive mechanism also includes a large gear G ₁₀ having the same number of teeth that is pivotally supported by the other stationary pivot shaft 35 and meshes with the large gear G _6, and a small gear G coaxially fixed to the large gear G ₁₀ . ₁₁ and an idler gear G ₁₂ (the same number of teeth as G ₈ ) meshed with this and pivotally supported by the short link 36, and a gear G ₁₃ meshed with this and fixed to the other rotary body 10b. 10b is also rotated in the direction of arrow Y at 1/6 of the rotation speed of the cam means 19.

Next, the operation of the guide means and the rotation drive mechanism will be outlined. In FIG. 5, in the A state (in FIG. 2) in which the projecting bodies 14, 15 are on the orbits C ₁ , C ₂ (at the time of FIG. 2), the lift of the cam 19a is minimum and the connecting pin 39 is also at the top dead center position. is there. As the motor Mo continues to rotate, as shown in FIG. 6, the protrusions 14 and 15 start to abut on the circumferential tracks C ₁ and C _{2 due to} the middle lift of the cam 19a (start of lateral sealing) in the B state (FIG. 2). become. The connecting pin 39 is slightly lowered from the top dead center, and the long and short links 33, 36 swing about the fixed position pivots 32, 35 so as to open slightly relative to each other. After that, the projecting bodies 14 and 15 move away so that the contact surface pressures of them become constant by pivoting so that the long and short links 33 and 36 open as the lift of the cam 19 increases, and as shown in FIG. As shown in the figure, the maximum distance is reached and the state becomes C (Fig. 2). At this time, the cam 19a is at the maximum lift and the connecting pin 39 is at the bottom dead center. After that, as the lift of the cam 19 decreases, the protrusions 14 and 15 approach each other, but the contact is released at the stage of the state D (FIG. 2) at the end of contact shown in FIG. It returns to the orbital loci C ₁ and C ₂ (transverse seal is completed). After that, the next projecting bodies 14 and 15 repeat the operation of FIGS. 5 to 8 again.

[0018]

[Effect of the device]

 As described above, according to the submerged heat seal device in the automatic packaging machine of the present invention, since the change in the lift of the cam means is transmitted to the pair of rotating bodies through the guide means composed of the links, electrical and mechanical disturbances are generated. Even with respect to the above, the phase relationship is maintained without being disturbed, and stable operation is possible. Further, by incorporating the gear transmission means in the guide means, the cam means and the pair of rotating bodies can be rotationally driven by one motor.

[Brief description of drawings]

FIG. 1 is a front view of an automatic packaging machine according to the present invention.

FIG. 2 is a diagram illustrating the principle of the heat seal device of the present invention.

3A is a front view of one rotating body of the heat seal device of the present invention, and FIG. 3B is a sectional view taken along line III-III of FIG.

4A is a front view of the other rotating body, and FIG. 4B is a sectional view taken along line IV-IV of FIG. 4A.

FIG. 5 is a principle explanatory view showing an operation change of the guide means and the cam means of the heat seal device and the rotation drive mechanism of the rotating body.

FIG. 6 is a principle explanatory view showing an operation change of the guide means and the cam means of the heat seal device and the rotation drive mechanism of the rotating body.

FIG. 7 is a principle explanatory view showing an operation change of the guide means and the cam means of the heat seal device and the rotation drive mechanism of the rotating body.

FIG. 8 is a principle explanatory view showing an operation change of the guide means and the cam means of the heat seal device and the rotation drive mechanism of the rotating body.

FIG. 9 is an explanatory perspective view of a conventional cam means and a rotary drive mechanism for a rotating body.

[Explanation of symbols]

1 Automatic Wrapping Machine 10a Heat Sealing Device 10b Rotating Body 14, 15 Heat Sealing Protrusion 19 Cam Means 19a Cam 31 Cam Follower 32, 35 Positioning Pivot Shaft 33 Long Link 36 Short Link 39 Connecting Shaft 41, 42 Cross Link L Rotating Distance between centers O ₁ , O ₂ Rotation center R ₁ , R ₂ Radius from the rotation center to the outermost peripheral point of the heat seal protrusion T Tube packaging film C ₁ , C ₂ Circulation trajectory

Claims (1)

[Scope of utility model registration request] 1. A heat seal protrusion is arranged parallel to each other at a seal pitch interval on each outer periphery of a pair of rotating bodies that are driven to rotate at a constant circumferential speed, and the corresponding heat seal protrusion has an arc-shaped seal. The tube-shaped packaging film containing the liquid to be packaged fed between the surfaces is heat-sealed at the above-mentioned sealing pitch intervals, and the arc-shaped sealing surfaces of the corresponding heat-sealing protrusions abut each other. The distance between the rotation centers of the rotating bodies in the non-rotating state is shorter than the sum of the radii from the rotation center of the rotating body to the outermost peripheral point of the arc-shaped sealing surface of the heat-sealing protrusion, and the heat-sealing protrusion While the circular arc-shaped sealing surface of the part abuts, the abutment part is displaced from the circumferential locus when not abutting and the abutting part is moved along the movement path of the tubular packaging film, and the aforesaid circumferential locus is reached when the abutting ends. I'll be back to In the submerged heat-sealing device in the automatic packaging machine in which each rotating body is guided by the guiding means, the guiding means is a rotation trajectory while the arc-shaped sealing surface of the heat-sealing protruding portion is in contact. Has a cam having a lift corresponding to the amount of displacement of the sealing surface from one side and a cam follower abutting against the cam at one end, and is pivotally supported by a stationary pivot shaft at an intermediate portion of one of the rotating bodies. And a long link that is rotatably pivoted about the other end, and one end is pivotally supported by the other one of the positioning pivots that is symmetrical to the positioning pivot with respect to the film moving path and the one rotation is A short link rotatably rotatably about the other rotary body at a symmetrical position with the body, one end of each of the long link and the short link being connected to each other end, and the other end being connected to each other in a ∧ shape, and The connecting axis moves linearly on the above film movement path The cam has a pair of symmetrical bridging links that are vertically guided by an inner member, and the rotational angular velocity of the cam is 1 / N of the number N of heat-seal protrusions with respect to the rotational angular velocity of the rotating body. The submerged heat seal device in an automatic packaging machine is characterized in that it is driven to rotate like this.