MULTI-PURPOSE SEALING MODULE FOR PLASTIC FILM BASED BAGS AND POUCHES MAKING MACHINE

Abstract

Multi-purpose sealing module (20) for machine (10) to manufacture heat-sealed plastic film based bags comprises a servo motor driven common drive shaft (30) in keyed connection with eccentric cams (40a, 40b) and (50a, 50b) such that eccentricity is equal and in opposite directions. Crank arms (60a, 60b) are connected to the eccentric cams (40a, 40b) though bearings (80a, 80b) and through bearings (120a, 120b) to linear guide rods (100a, 100b). Linear guide rods (100a, 100b) are in rigid connection with upper seal beam (140). Crank arms (70a, 70b) are connected to the eccentric cams (50a, 50b) though bearings (90a, 90b) and through bearings (130a, 130b) to connecting rods (110a, 110b). Connecting rods (110a, 110b) are in rigid connection with lower seal beam (150). Movement of lower seal beam (150) is guided by linear guide rods (100a, 100b). Angular movement of common drive shaft (30) gives simultaneous linear movement in opposite directions to upper seal beam (140) and lower seal beam (150) controlling the gap between a sealing jaw connected to upper seal beam (140) and a sealing jaw connected to the lower seal beam (150). Seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (30) are controlled by a programmable controller.

Claims

1. A multi-purpose sealing module (20) for a machine (10) to manufacture heat-sealed plastic film based bags and pouches, comprising a. a servo motor driven common drive shaft (30) in keyed connection with eccentric cams (40a, 40b) and eccentric cams (50a, 50b) such that eccentricity is equal and in opposite directions; b. crank arms (60a, 60b) connected to the eccentric cams (40a, 40b) though bearings (80a, 80b) and through bearings (120a, 120b) to linear guide rods (100a, 100b); c. the linear guide rods (100a, 100b) in rigid connection with upper seal beam (140); d. crank arms (70a, 70b) connected to the eccentric cams (50a, 50b) though bearings (90a, 90b) and through bearings (130a, 130b) to Connecting Rods (110a, 110b); e. the Connecting Rods (110a, 110b) in rigid connection with lower seal beam (150); f. movement of the lower seal beam (150) guided by the linear guide rods (100a, 100b); and g. angular movement of the drive shaft (30) giving simultaneous linear movement in opposite directions to the upper seal beam (140) and the lower seal beam (150) controlling the gap between a sealing jaw connected to the upper seal beam (140) and a sealing jaw connected to the lower seal beam (150); and seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (30) controlled by a programmable controller.

2. The multi-purpose sealing module (20) as claimed in claim 1 wherein the common drive shaft (30) is driven by pneumatic rotary actuators.

3. The multi-purpose sealing module (20) as claimed in claim 1 wherein the common drive shaft (30) is connected with eccentric cams (40a, 40b) and eccentric cams (50a, 50b) using clamping bushes.

4. A multi-purpose sealing module (220) for a machine (210) to manufacture heat-sealed plastic film based bags and pouches, comprising a. a servo motor driven common drive shaft (230) in keyed connection with eccentric cams (240a, 240b) and eccentric cams (250a, 250b) such that eccentricity is equal and in opposite directions; b. crank arms (260a, 260b) connected to the eccentric cams (240a, 240b) though bearings (280a, 280b) and through bearings (320a, 320b) to linear guide rods (300a, 300b); c. the linear guide rods (300a, 300b) in rigid connection with front seal beam (340); d. crank arms (270a, 270b) connected to the eccentric cams (250a, 250b) though bearings (290a, 290b) and through bearings (330a, 330b) to Connecting Rods (310a, 310b); e. the Connecting Rods (310a, 310b) in rigid connection with rear seal beam (350); f. movement of the rear seal beam (350) guided by the linear guide rods (300a, 300b); and g. angular movement of the drive shaft (230) giving simultaneous linear movement in opposite directions to the front seal beam (340) and the rear seal beam (350) controlling the gap between a sealing jaw connected to the front seal beam (340) and a sealing jaw connected to the rear seal beam (350); and seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (230) controlled by a programmable controller.

5. The multi-purpose sealing module (220) as claimed in claim 4 wherein the common drive shaft (230) is driven by pneumatic rotary actuators.

6. The multi-purpose sealing module (220) as claimed in claim 4 wherein the common drive shaft (230) is connected with eccentric cams (240a, 240b) and eccentric cams (250a, 250b) using clamping bushes.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows a machine for manufacturing plastic film based bags and pouches in accordance with the present invention where the plastic film is in horizontal position.

[0025] FIG. 2 shows main components of the multi-purpose sealing module for the machine in FIG. 1.

[0026] FIG. 3 shows a machine for manufacturing plastic film based bags and pouches in accordance with the present invention where the plastic film is in vertical position.

[0027] FIG. 4 shows main components of the multi-purpose sealing module for the machine in FIG. 3.

[0028] FIG. 5 shows linear movement of crank arms in relation to angular movement of eccentric cams of the multi-purpose sealing modules shown in FIGS. 2 and 4.

[0029] FIG. 6 shows calculation of force generated at the end of crank arms in multi-purpose sealing module due to applied torque on common drive shaft with reference to angular movement of the common drive shaft.

DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention discloses a multi-purpose sealing module (20) shown in FIG. 2 for a machine (10) shown in FIG. 1 to manufacture heat-sealed plastic film based bags and pouches. In the said module (20), a common drive shaft (30) is driven by a servo motor (not shown). The common drive shaft (30) has a keyways on it. An upper seal beam (140) and a lower seal beam (150) are parts of the said module (20) and linearly move towards or away from each other in a controlled manner permitting desired and precise gaps in between sealing jaws (not shown) mounted on each of the two seal beams (140, 150). The plastic film is conventionally transported to the said gap for heat-sealing and after heat-sealing, transported further.

[0031] The upper seal beam (140) is rigidly connected with linear guide rods (100a, 100b) at both the ends. Conventionally, at such connection, a spring or a resilient coupling is used; however, the present invention, instead, has a rigid connection thereat. The said linear guide rods (100a, 100b) pass through holes in the lower seal beam (150) to guide movement of the lower seal beam (150).

[0032] The upper seal beam (140) and the lower seal beam (150) move linearly towards or away from each other. Such linear movement results from conversion of angular movement of the common drive shaft (30) into the said linear movement using crank and crank arm arrangements at four places: two for the upper seal beam (140) and two for the lower seal beam (150).

[0033] The servo motor driven common drive shaft (30) has keyed connections with two eccentric cams (40a, 40b) for the upper seal beam (140) and two eccentric cams (50a, 50b) for the lower seal beam (150). The eccentricity of the eccentric cams (40a, 40b) for the upper seal beam (140) is equal to and in opposite direction from the eccentricity of the eccentric cams (50a, 50b) for the lower seal beam (150).

[0034] For each of the four eccentric cams, there is a crank arm. Thus, there are two crank arms (60a, 60b) for the eccentric cams (40a, 40b) for the upper seal beam (140) and likewise, there are two crank arms (70a, 70b) for the eccentric cams (50a, 50b) for the lower seal beam (150). The connection of each crank arm with its eccentric cam is through a bearing. Thus, connection of crank arm (60a) with eccentric cam (40a) is through bearing (80a) and connection of crank arm (60b) with eccentric cam (40b) is through bearing (80b) for the upper seal beam (140) and similarly, connection of crank arm (70a) with eccentric cam (50a) is through bearing (90a) and connection of crank arm (70b) with eccentric cam (50b) is through bearing (90b).

[0035] The servo motor (not shown) driven angular movement of the common drive shaft (30) which is in keyed connection with the eccentric cams will be converted into linear movement of the crank arms. Selectively, the said angular movement of the common drive shaft (30) can be less than 360 degree angular rotation or a full 360 degree rotation. It can be discerned that whatever the angular movement is selected, it will be in opposite direction for the eccentric cams (40a, 40b) for the upper seal beam (140) and the eccentric cams (50a, 50b) for the lower seal beam (150)

[0036] The crank arms (60a, 60b) for the upper seal beam (140) are connected to the linear guide rods (100a, 100b) through bearings (120a, 120b) and the crank arms (70a, 70b) for the lower seal beam (150) are connected to connecting rods (110a, 110b) which are rigidly connected to the lower seal beam (150).

[0037] Therefore, angular movement of the common drive shaft (300 gives simultaneous linear movement in opposite directions to the upper seal beam (140) and the lower seal beam (150). The gap between the sealing jaw (not shown) connected to the upper seal beam (140) and the sealing jaw (not shown) connected to the lower seal beam (150) is thus controlled. Seal time and seal pressure of sealing of the plastic film based bags and pouches; and angular movement of the common drive shaft (30) are controlled by a programmable controller. For different thicknesses of the plastic film or for different materials of the plastic film, suitable seal time, seal pressure, and angular movement of the common drive shaft (30) data available to the machine operator can be selected using the controller.

[0038] The common drive shaft (30) can be driven by pneumatic rotary actuators (not shown) instead of servo motor (not shown). The common drive shaft (30) can be connected with eccentric cams (40a, 40b) and eccentric cams (50a, 50b) using clamping bushes (not shown) instead of the keyed connection described above in which case, the common drive shaft (30) need not have a keyways on it.

[0039] It would be evident to a person skilled in the art that the present invention is applicable equally to a machine wherein the plastic film is transported vertically as opposed to horizontally. In other words, the same inventive concept disclosed herein can be used in a machine to manufacture plastic film based bags and pouches when the plastic film is fed vertically. In such machines, instead of upper and lower beams, front and rear beams would be used while retaining the concept of converting angular movement of a common drive shaft into linear movement using crank and crank arm arrangements at four places: two for the front seal beam and two for the rear seal beam.

[0040] The present invention discloses a multi-purpose sealing module (220) shown in FIG. 4 for a machine (210) shown in FIG. 3 to manufacture heat-sealed plastic film based bags and pouches. In the said module (220), a common drive shaft (230) is driven by a servo motor (not shown). The common drive shaft (230) has a key throughout its length. An front seal beam (340) and a rear seal beam (350) are parts of the said module (220) and linearly move towards or away from each other in a controlled manner permitting desired and precise gaps in between sealing jaws (not shown) mounted on each of the two seal beams (340, 350). The plastic film is conventionally transported to the said gap for heat-sealing and after heat-sealing, transported further.

[0041] The front seal beam (340) is rigidly connected with linear guide rods (300a, 300b) at both the ends. Conventionally, at such connection, a spring or a resilient coupling is used; however, the present invention, instead, has a rigid connection thereat. The said linear guide rods (300a, 300b) pass through holes in the rear seal beam (350) to guide movement of the rear seal beam (350).

[0042] The front seal beam (340) and the rear seal beam (350) move linearly towards or away from each other. Such linear movement results from conversion of angular movement of the common drive shaft (230) into the said linear movement using crank and crank arm arrangements at four places: two for the front seal beam (340) and two for the rear seal beam (350).

[0043] The servo motor driven common drive shaft (230) has keyed connections with two eccentric cams (240a, 240b) for the front seal beam (340) and two eccentric cams (250a, 250b) for the rear seal beam (350). The eccentricity of the eccentric cams (240a, 240b) for the front seal beam (340) is equal to and in opposite direction from the eccentricity of the eccentric cams (250a, 250b) for the rear seal beam (350).

[0044] For each of the four eccentric cams, there is a crank arm. Thus, there are two crank arms (260a, 260b) for the eccentric cams (240a, 240b) for the front seal beam (340) and likewise, there are two crank arms (270a, 270b) for the eccentric cams (250a, 250b) for the rear seal beam (350). The connection of each crank arm with its eccentric cam is through a bearing. Thus, connection of crank arm (260a) with eccentric cam (240a) is through bearing (280a) and connection of crank arm (260b) with eccentric cam (240b) is through bearing (280b) for the front seal beam (340) and similarly, connection of crank arm (270a) with eccentric cam (250a) is through bearing (290a) and connection of crank arm (270b) with eccentric cam (250b) is through bearing (290b).

[0045] The servo motor (not shown) driven angular movement of the common drive shaft (230) which is in keyed connection with the eccentric cams will be converted into linear movement of the crank arms. Selectively, the said angular movement of the common drive shaft (230) can be less than 360 degree angular rotation or a full 360 degree rotation. It can be discerned that whatever the angular movement is selected, it will be in opposite direction for the eccentric cams (240a, 240b) for the front seal beam (340) and the eccentric cams (250a, 250b) for the rear seal beam (350).

[0046] The crank arms (260a, 260b) for the front seal beam (340) are connected to the linear guide rods (300a, 300b) through bearings (320a, 320b) and the crank arms (270a, 270b) for the rear seal beam (350) are connected to connecting rods (310a, 310b) which are rigidly connected to the rear seal beam (350).

[0047] Therefore, angular movement of the common drive shaft (230) gives simultaneous linear movement in opposite directions to the front seal beam (340) and the rear seal beam (350). The gap between the sealing jaw (not shown) connected to the front seal beam (340) and the sealing jaw (not shown) connected to the rear seal beam (350) is thus controlled. Seal time and seal pressure of sealing of the plastic film based bags and pouches; and angular movement of the common drive shaft (230) are controlled by a programmable controller. For different thicknesses of the plastic film or for different materials of the plastic film, suitable seal time, seal pressure, and angular movement of the common drive shaft (230) data available to the machine operator can be selected using the controller.

[0048] The common drive shaft (230) can be driven by pneumatic rotary actuators (not shown) instead of servo motor (not shown). The common drive shaft (230) can be connected with eccentric cams (240a, 240b) and eccentric cams (250a, 250b) using clamping bushes (not shown) instead of the keyed connection described above in which case, the common drive shaft (230) need not have a keyways on it.

BEST METHOD OF PERFORMING THE INVENTION

[0049] The best method of performing the present invention is with the multi-purpose sealing module (20) shown in FIG. 2 for a machine (10) shown in FIG. 1.

[0050] Referring to FIG. 5 which shows linear movement of crank arms (60a, 60b) and crank arms (70a, 70b) in relation to angular movement of eccentric cams (40a, 40b) and eccentric cams (50a, 50b) of the multi-purpose sealing module (20) shown in FIG. 2. As a person skilled in the art will readily understand, what is explained in FIG. 5 is applicable also to linear movement of crank arms (260a, 260b) and crank arms (270a, 270b) in relation to angular movement of eccentric cams (240a, 240b) and eccentric cams (250a, 250b) of the multi-purpose sealing module (220) shown in FIG. 4.

[0051] In FIG. 5, E1 represents the eccentricity between the common drive shaft (30) and the eccentric cams (40a, 40b) and L1 represents the length of the crank arms (60a, 60b). Similarly, E2 represents the eccentricity between the common drive shaft (30) and the eccentric cams (50a, 50b) and L2 represents the length of the crank arms (70a, 70b). Angular movement of the common drive shaft (30) is represented by ?, referred to as the crank angle.

[0052] At crank angle ?=0 degree, the upper seal beam (140) will be at its topmost position (1?t) as shown in FIG. 5 and the lower seal beam (150) will be at its bottommost position (2?b). This can be termed as maximum gap position or home position. At crank angle ?=180 degrees, upper seal beam (140) will be at its bottommost position (1?b) and lower seal beam (150) will be at its topmost position (2?t). This can be termed as no gap position or sealing position. 1 and 2 are the intermediate positions of the upper seal beam (140) and the lower seal beam (150) respectively for angular movement ? degree of the eccentric cams (40a, 40b) and the eccentric cams (50a, 50b) mounted on the common drive shaft (30). Distance between 1 and 2 is the live gap between the upper seal beam (140) and the lower sealing beam (150) for particular crank angle ?.

[0053] Linear downward movement of the upper seal beam (140) in reference to crank angle ? derives from following equation,

[00001]$E1?\left(1-\mathrm{COS}?\right)+\left(L1?\left(1-\mathrm{COS}\left(\mathrm{SIN}-1\left(E1?\mathrm{SIN}?/L1\right)\right)\right)\right)$

[0054] Linear upward movement of the lower sealing beam (150) in reference to crank angle ? derives from following equation,

[00002]$E2?\left(1-\mathrm{COS}?\right)+\left(L2?\mathrm{COS}\left(\mathrm{SIN}-1\left(E2?\mathrm{SIN}?/L2\right)\right)-1\right)$

[0055] As shown in FIG. 8, force is generated at the end of crank arms (60a, 60b) and crank arms (70a, 70b) in multi-purpose sealing module (20) due to applied torque on the common drive shaft (30) with reference to eccentric cams (40a, 40b) and eccentric cams (50a, 50b) and angular movement ?. This value corresponds to the capability of the sealing force generated at particular angular movement ?.

[0056] Calculation of force generated the end of the end of crank arms (60a, 60b) and crank arms (70a, 70b) with reference to the various crank angles ? derives from following equation,

[00003]$T/\left(E?\mathrm{COS}?+L?\mathrm{COS}?\right)/\mathrm{TAN}?$

Where, T=Torque applied by Drive Shaft; and
?=Angle of Crank Rod with motion line

[0057] Crank angle ? from the required Gap between the upper seal beam (140) and the lower seal beam (150) in the multi-purpose sealing module (20) can be calculated.

[0058] For processing different types of plastic films, a Gap or the opening between the upper seal beam (140) and the lower seal beam (150) may be required to be set in the multi-purpose sealing module (20). For heat sensitive films, gap requirement is higher to keep the heated seal beams away from the plastic film during non-sealing durations. Narrow Gap opening feature makes the multi-purpose sealing module (20) suitable to be operated at a high speed.

[0059] Calculation of Crank Degree ? from the required Gap G as input derives from the following equation,

[00004]${\mathrm{COS}}^{-1}\left(1-G/2/E\right)$

[0060] Seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (30) are controlled by a programmable controller (not shown).

Example 1

[0061] In Example 1, the upper Seal beam (140) linear movement and lower seal beam (150) linear movement against each degree of angular movement ? of the eccentric cams (40a, 40b) with 10 mm of eccentricity values for E1 and E2 and 72 mm as lengths L1 and L2 of crank arms (60a, 60b) are considered. Linear movements are tabulated in the attached Table-1 (for 0 to 180 degree) and Table-2 (for 180 to 360 degree).

TABLE-US-00001 TABLE 1 Top Sealer Bottom Sealer Crank Down by Up by Angle ? 1 ? t > 1 2 ? b > 2 Gap 0 0.0000 0.0000 40.000 1 0.0017 0.0013 39.997 2 0.0069 0.0052 39.988 3 0.0156 0.0118 39.973 4 0.0277 0.0210 39.951 5 0.0433 0.0328 39.924 6 0.0624 0.0472 39.890 7 0.0849 0.0642 39.851 8 0.1108 0.0839 39.805 9 0.1401 0.1061 39.754 10 0.1729 0.1310 39.696 11 0.2090 0.1584 39.633 12 0.2485 0.1885 39.563 13 0.2914 0.2211 39.487 14 0.3377 0.2564 39.406 15 0.3873 0.2942 39.319 16 0.4402 0.3346 39.225 17 0.4963 0.3776 39.126 18 0.5558 0.4231 39.021 19 0.6185 0.4712 38.910 20 0.6844 0.5218 38.794 21 0.7534 0.5750 38.672 22 0.8257 0.6306 38.544 23 0.9011 0.6889 38.410 24 0.9795 0.7496 38.271 25 1.0611 0.8128 38.126 26 1.1456 0.8785 37.976 27 1.2332 0.9467 37.820 28 1.3237 1.0173 37.659 29 1.4172 1.0904 37.492 30 1.5136 1.1659 37.321 31 1.6128 1.2439 37.143 32 1.7148 1.3242 36.961 33 1.8196 1.4070 36.773 34 1.9271 1.4921 36.581 35 2.0373 1.5797 36.383 36 2.1502 1.6695 36.180 37 2.2656 1.7617 35.973 38 2.3836 1.8562 35.760 39 2.5041 1.9530 35.543 40 2.6271 2.0521 35.321 41 2.7524 2.1534 35.094 42 2.8802 2.2569 34.863 43 3.0102 2.3627 34.627 44 3.1425 2.4707 34.387 45 3.2770 2.5809 34.142 46 3.4137 2.6932 33.893 47 3.5524 2.8076 33.640 48 3.6932 2.9242 33.383 49 3.8360 3.0428 33.121 50 3.9808 3.1634 32.856 51 4.1274 3.2862 32.586 52 4.2759 3.4109 32.313 53 4.4262 3.5375 32.036 54 4.5781 3.6662 31.756 55 4.7317 3.7967 31.472 56 4.8870 3.9292 31.184 57 5.0437 4.0635 30.893 58 5.2020 4.1996 30.598 59 5.3617 4.3376 30.301 60 5.5227 4.4773 30.000 61 5.6851 4.6187 29.696 62 5.8487 4.7618 29.389 63 6.0135 4.9067 29.080 64 6.1795 5.0531 28.767 65 6.3465 5.2011 28.452 66 6.5145 5.3507 28.135 67 6.6835 5.5018 27.815 68 6.8534 5.6544 27.492 69 7.0241 5.8085 27.167 70 7.1956 5.9640 26.840 71 7.3679 6.1208 26.511 72 7.5407 6.2789 26.180 73 7.7142 6.4384 25.847 74 7.8882 6.5991 25.513 75 8.0627 6.7609 25.176 76 8.2376 6.9240 24.838 77 8.4128 7.0881 24.499 78 8.5884 7.2534 24.158 79 8.7642 7.4196 23.816 80 8.9402 7.5868 23.473 81 9.1163 7.7550 23.129 82 9.2925 7.9240 22.783 83 9.4687 8.0939 22.437 84 9.6449 8.2646 22.091 85 9.8209 8.4359 21.743 86 9.9968 8.6080 21.395 87 10.1725 8.7807 21.047 88 10.3480 8.9540 20.698 89 10.5231 9.1279 20.349 90 10.6978 9.3022 20.000 91 10.8721 9.4769 19.651 92 11.0460 9.6520 19.302 93 11.2193 9.8275 18.953 94 11.3920 10.0032 18.605 95 11.5641 10.1791 18.257 96 11.7354 10.3551 17.909 97 11.9061 10.5313 17.563 98 12.0760 10.7075 17.217 99 12.2450 10.8837 16.871 100 12.4132 11.0598 16.527 101 12.5804 11.2358 16.184 102 12.7466 11.4116 15.842 103 12.9119 11.5872 15.501 104 13.0760 11.7624 15.162 105 13.2391 11.9373 14.824 106 13.4009 12.1118 14.487 107 13.5616 12.2858 14.153 108 13.7211 12.4593 13.820 109 13.8792 12.6321 13.489 110 14.0360 12.8044 13.160 111 14.1915 12.9759 12.833 112 14.3456 13.1466 12.508 113 14.4982 13.3165 12.185 114 14.6493 13.4855 11.865 115 14.7989 13.6535 11.548 116 14.9469 13.8205 11.233 117 15.0933 13.9865 10.920 118 15.2382 14.1513 10.611 119 15.3813 14.3149 10.304 120 15.5227 14.4773 10.000 121 15.6624 14.6383 9.699 122 15.8004 14.7980 9.402 123 15.9365 14.9563 9.107 124 16.0708 15.1130 8.816 125 16.2033 15.2683 8.528 126 16.3338 15.4219 8.244 127 16.4625 15.5738 7.964 128 16.5891 15.7241 7.687 129 16.7138 15.8726 7.414 130 16.8366 16.0192 7.144 131 16.9572 16.1640 6.879 132 17.0758 16.3068 6.617 133 17.1924 16.4476 6.360 134 17.3068 16.5863 6.107 135 17.4191 16.7230 5.858 136 17.5293 16.8575 5.613 137 17.6373 16.9898 5.373 138 17.7431 17.1198 5.137 139 17.8466 17.2476 4.906 140 17.9479 17.3729 4.679 141 18.0470 17.4959 4.457 142 18.1438 17.6164 4.240 143 18.2383 17.7344 4.027 144 18.3305 17.8498 3.820 145 18.4203 17.9627 3.617 146 18.5079 18.0729 3.419 147 18.5930 18.1804 3.227 148 18.6758 18.2852 3.039 149 18.7561 18.3872 2.857 150 18.8341 18.4864 2.679 151 18.9096 18.5828 2.508 152 18.9827 18.6763 2.341 153 19.0533 18.7668 2.180 154 19.1215 18.8544 2.024 155 19.1872 18.9389 1.874 156 19.2504 19.0205 1.729 157 19.3111 19.0989 1.590 158 19.3694 19.1743 1.456 159 19.4250 19.2466 1.328 160 19.4782 19.3156 1.206 161 19.5288 19.3815 1.090 162 19.5769 19.4442 0.979 163 19.6224 19.5037 0.874 164 19.6654 19.5598 0.775 165 19.7058 19.6127 0.681 166 19.7436 19.6623 0.594 167 19.7789 19.7086 0.513 168 19.8115 19.7515 0.437 169 19.8416 19.7910 0.367 170 19.8690 19.8271 0.304 171 19.8939 19.8599 0.246 172 19.9161 19.8892 0.195 173 19.9358 19.9151 0.149 174 19.9528 19.9376 0.110 175 19.9672 19.9567 0.076 176 19.9790 19.9723 0.049 177 19.9882 19.9844 0.027 178 19.9948 19.9931 0.012

TABLE-US-00002 TABLE 2 Top Sealer Bottom Sealer Crank Down by Up by Angle ? 1 ? t > 1 2 ? b > 2 Gap 180 20.0000 20.0000 0.000 181 19.9987 19.9983 0.003 182 19.9948 19.9931 0.012 183 19.9882 19.9844 0.027 184 19.9790 19.9723 0.049 185 19.9672 19.9567 0.076 186 19.9528 19.9376 0.110 187 19.9358 19.9151 0.149 188 19.9161 19.8892 0.195 189 19.8939 19.8599 0.246 190 19.8690 19.8271 0.304 191 19.8416 19.7910 0.367 192 19.8115 19.7515 0.437 193 19.7789 19.7086 0.513 194 19.7436 19.6623 0.594 195 19.7058 19.6127 0.681 196 19.6654 19.5598 0.775 197 19.6224 19.5037 0.874 198 19.5769 19.4442 0.979 199 19.5288 19.3815 1.090 200 19.4782 19.3156 1.206 201 19.4250 19.2466 1.328 202 19.3694 19.1743 1.456 203 19.3111 19.0989 1.590 204 19.2504 19.0205 1.729 205 19.1872 18.9389 1.874 206 19.1215 18.8544 2.024 207 19.0533 18.7668 2.180 208 18.9827 18.6763 2.341 209 18.9096 18.5828 2.508 210 18.8341 18.4864 2.679 211 18.7561 18.3872 2.857 212 18.6758 18.2852 3.039 213 18.5930 18.1804 3.227 214 18.5079 18.0729 3.419 215 18.4203 17.9627 3.617 216 18.3305 17.8498 3.820 217 18.2383 17.7344 4.027 218 18.1438 17.6164 4.240 219 18.0470 17.4959 4.457 220 17.9479 17.3729 4.679 221 17.8466 17.2476 4.906 222 17.7431 17.1198 5.137 223 17.6373 16.9898 5.373 224 17.5293 16.8575 5.613 225 17.4191 16.7230 5.858 226 17.3068 16.5863 6.107 227 17.1924 16.4476 6.360 228 17.0758 16.3068 6.617 229 16.9572 16.1640 6.879 230 16.8366 16.0192 7.144 231 16.7138 15.8726 7.414 232 16.5891 15.7241 7.687 233 16.4625 15.5738 7.964 234 16.3338 15.4219 8.244 235 16.2033 15.2683 8.528 236 16.0708 15.1130 8.816 237 15.9365 14.9563 9.107 238 15.8004 14.7980 9.402 239 15.6624 14.6383 9.699 240 15.5227 14.4773 10.000 241 15.3813 14.3149 10.304 242 15.2382 14.1513 10.611 243 15.0933 13.9865 10.920 244 14.9469 13.8205 11.233 245 14.7989 13.6535 11.548 246 14.6493 13.4855 11.865 247 14.4982 13.3165 12.185 248 14.3456 13.1466 12.508 249 14.1915 12.9759 12.833 250 14.0360 12.8044 13.160 251 13.8792 12.6321 13.489 252 13.7211 12.4593 13.820 253 13.5616 12.2858 14.153 254 13.4009 12.1118 14.487 255 13.2391 11.9373 14.824 256 13.0760 11.7624 15.162 257 12.9119 11.5872 15.501 258 12.7466 11.4116 15.842 259 12.5804 11.2358 16.184 260 12.4132 11.0598 16.527 261 12.2450 10.8837 16.871 262 12.0760 10.7075 17.217 263 11.9061 10.5313 17.563 264 11.7354 10.3551 17.909 265 11.5641 10.1791 18.257 266 11.3920 10.0032 18.605 267 11.2193 9.8275 18.953 268 11.0460 9.6520 19.302 269 10.8721 9.4769 19.651 270 10.6978 9.3022 20.000 271 10.5231 9.1279 20.349 272 10.3480 8.9540 20.698 273 10.1725 8.7807 21.047 274 9.9968 8.6080 21.395 275 9.8209 8.4359 21.743 276 9.6449 8.2646 22.091 277 9.4687 8.0939 22.437 278 9.2925 7.9240 22.783 279 9.1163 7.7550 23.129 280 8.9402 7.5868 23.473 281 8.7642 7.4196 23.816 282 8.5884 7.2534 24.158 283 8.4128 7.0881 24.499 284 8.2376 6.9240 24.838 285 8.0627 6.7609 25.176 286 7.8882 6.5991 25.513 287 7.7142 6.4384 25.847 288 7.5407 6.2789 26.180 289 7.3679 6.1208 26.511 290 7.1956 5.9640 26.840 291 7.0241 5.8085 27.167 292 6.8534 5.6544 27.492 293 6.6835 5.5018 27.815 294 6.5145 5.3507 28.135 295 6.3465 5.2011 28.452 296 6.1795 5.0531 28.767 297 6.0135 4.9067 29.080 298 5.8487 4.7618 29.389 299 5.6851 4.6187 29.696 300 5.5227 4.4773 30.000 301 5.3617 4.3376 30.301 302 5.2020 4.1996 30.598 303 5.0437 4.0635 30.893 304 4.8870 3.9292 31.184 305 4.7317 3.7967 31.472 306 4.5781 3.6662 31.756 307 4.4262 3.5375 32.036 308 4.2759 3.4109 32.313 309 4.1274 3.2862 32.586 310 3.9808 3.1634 32.856 311 3.8360 3.0428 33.121 312 3.6932 2.9242 33.383 313 3.5524 2.8076 33.640 314 3.4137 2.6932 33.893 315 3.2770 2.5809 34.142 316 3.1425 2.4707 34.387 317 3.0102 2.3627 34.627 318 2.8802 2.2569 34.863 319 2.7524 2.1534 35.094 320 2.6271 2.0521 35.321 321 2.5041 1.9530 35.543 322 2.3836 1.8562 35.760 323 2.2656 1.7617 35.973 324 2.1502 1.6695 36.180 325 2.0373 1.5797 36.383 326 1.9271 1.4921 36.581 327 1.8196 1.4070 36.773 328 1.7148 1.3242 36.961 329 1.6128 1.2439 37.143 330 1.5136 1.1659 37.321 331 1.4172 1.0904 37.492 332 1.3237 1.0173 37.659 333 1.2332 0.9467 37.820 334 1.1456 0.8785 37.976 335 1.0611 0.8128 38.126 336 0.9795 0.7496 38.271 337 0.9011 0.6889 38.410 338 0.8257 0.6306 38.544 339 0.7534 0.5750 38.672 340 0.6844 0.5218 38.794 341 0.6185 0.4712 38.910 342 0.5558 0.4231 39.021 343 0.4963 0.3776 39.126 344 0.4402 0.3346 39.225 345 0.3873 0.2942 39.319 346 0.3377 0.2564 39.406 347 0.2914 0.2211 39.487 348 0.2485 0.1885 39.563 349 0.2090 0.1584 39.633 350 0.1729 0.1310 39.696 351 0.1401 0.1061 39.754 352 0.1108 0.0839 39.805 353 0.0849 0.0642 39.851 354 0.0624 0.0472 39.890 355 0.0433 0.0328 39.924 356 0.0277 0.0210 39.951 357 0.0156 0.0118 39.973 358 0.0069 0.0052 39.988 359 0.0017 0.0013 39.997 360 0.0000 0.0000 40.000

[0062] This concept is applied in multi-purpose sealing module (20) where very small movements at the ends of stroke can be used for its low impact and a gentle touch characteristic for sealing the plastic films without damage or deterioration, even while the common drive shaft (30) is having same angular speed throughout the cycle.

Example 2

[0063] In Example 2, torque considered is 50 Nm, eccentricity value (E) considered is 10 mm, length of crank arms (60a, 60b) and crank arms (70a, 70b) considered is 72 mm. Force generated at the end of crank arms (60a, 60b) and crank arms (70a, 70b) against each degree of angular movement ? of the eccentric cams (40a, 40b) and eccentric cams (50a, 50b) due to torque applied on the common drive shaft (30) are tabulated in Table-3.

TABLE-US-00003 TABLE 3 Crank Degree Force (N) 0.0001 2 51 54 24 466 1 2 51 560 2 1 25 806 3 83 900 4 62 955 5 50 395 6 42 028 7 36 056 8 31 582 9 28 106 10 25 328 11 23 059 12 21 171 13 19 576 14 18 212 15 17 032 16 16 002 17 15 095 18 14 291 19 13 573 20 12 930 21 12 349 22 11 823 23 11 344 24 10 907 25 10 506 26 10 138 27 9 798 28 9 485 29 9 194 30 8 924 31 8 673 32 8 439 33 8 220 34 8 016 35 7 824 36 7 645 37 7 476 38 7 318 39 7 168 40 7 028 41 6 895 42 6 771 43 6 653 44 6 541 45 6 436 46 6 336 47 6 242 48 6 153 49 6 069 50 5 989 51 5 914 52 5 842 53 5 775 54 5 711 55 5 651 56 5 594 57 5 540 58 5 489 59 5 441 60 5 396 61 5 354 62 5 314 63 5 276 64 5 241 65 5 209 66 5 178 67 5 150 68 5 124 69 5 100 70 5 078 71 5 057 72 5 039 73 5 023 74 5 008 75 4 995 76 4 984 77 4 975 78 4 967 79 4 961 80 4 956 81 4 954 82 4 952 83 4 953 84 4 955 85 4 958 86 4 964 87 4 970 88 4 979 89 4 989 90 5 000 91 5 013 92 5 028 93 5 044 94 5 062 95 5 081 96 5 102 97 5 125 98 5 150 99 5 176 100 5 204 101 5 234 102 5 265 103 5 299 104 5 334 105 5 371 106 5 410 107 5 452 108 5 495 109 5 541 110 5 589 111 5 639 112 5 691 113 5 746 114 5 804 115 5 864 116 5 927 117 5 992 118 6 061 119 6 133 120 6 208 121 6 286 122 6 368 123 6 453 124 6 543 125 6 636 126 6 734 127 6 836 128 6 942 129 7 054 130 7 171 131 7 293 132 7 422 133 7 556 134 7 697 135 7 845 136 8 001 137 8 164 138 8 337 139 8 518 140 8 709 141 8 911 142 9 124 143 9 349 144 9 587 145 9 840 146 10 109 147 10 395 148 10 699 149 11 024 150 11 371 151 11 743 152 12 143 153 12 572 154 13 036 155 13 538 156 14 083 157 14 676 158 15 323 159 16 034 160 16 816 161 17 682 162 18 646 163 19 723 164 20 937 165 22 314 166 23 889 167 25 708 168 27 831 169 30 342 170 33 358 171 37 045 172 41 657 173 47 589 174 55 501 175 66 581 176 83 207 177 1 10 922 178 1 66 360 179 3 32 694 179.9999 3 32 68 51 714

[0064] This concept is applied in multi-purpose sealing module (20) where large amount of force at sealing beams can be generated and is utilized for sealing a variety of film thicknesses.

Example 3

[0065] In Example 3, the eccentricity value (E) considered is 10 mm for the eccentric cams (40a, 40b) the eccentric cams (50a, 50b). Maximum Gap value settable is (2xE1+2xE2). In this Example, Maximum Gap will be 40 mm against each Control Gap dimension as input value, the degree of angular movement ? of the eccentric cams (40a, 40b) the eccentric cams (50a, 50b) is tabulated in Table-4.

TABLE-US-00004 TABLE 4 Gap Crank Degree 0.00 0.0000 0.25 9.0687 0.50 12.8386 0.75 15.7405 1.00 18.1949 1.25 20.3641 1.50 22.3316 1.75 24.1468 2.00 25.8419 2.25 27.4392 2.50 28.9550 2.75 30.4015 3.00 31.7883 3.25 33.1229 3.50 34.4115 3.75 35.6591 4.00 36.8699 4.25 38.0475 4.50 39.1950 4.75 40.3149 5.00 41.4096 5.25 42.4811 5.50 43.5312 5.75 44.5613 6.00 45.5730 6.25 46.5675 6.50 47.5458 6.75 48.5092 7.00 49.4584 7.25 50.3943 7.50 51.3178 7.75 52.2295 8.00 53.1301 8.25 54.0202 8.50 54.9004 8.75 55.7711 9.00 56.6330 9.25 57.4864 9.50 58.3318 9.75 59.1695 10.00 60.0000 10.25 60.8236 10.50 61.6406 10.75 62.4515 11.00 63.2563 11.25 64.0555 11.50 64.8493 11.75 65.6380 12.00 66.4218 12.25 67.2010 12.50 67.9757 12.75 68.7462 13.00 69.5127 13.25 70.2754 13.50 71.0344 13.75 71.7900 14.00 72.5424 14.25 73.2917 14.50 74.0380 14.75 74.7815 15.00 75.5225 15.25 76.2610 15.50 76.9971 15.75 77.7311 16.00 78.4630 16.25 79.1931 16.50 79.9213 16.75 80.6480 17.00 81.3731 17.25 82.0968 17.50 82.8192 17.75 83.5406 18.00 84.2608 18.25 84.9802 18.50 85.6988 18.75 86.4167 19.00 87.1340 19.25 87.8509 19.50 88.5675 19.75 89.2838 20.00 90.0000 20.25 90.7162 20.50 91.4325 20.75 92.1491 21.00 92.8660 21.25 93.5833 21.50 94.3012 21.75 95.0198 22.00 95.7392 22.25 96.4594 22.50 97.1808 22.75 97.9032 23.00 98.6269 23.25 99.3520 23.50 100.0787 23.75 100.8069 24.00 101.5370 24.25 102.2689 24.50 103.0029 24.75 103.7390 25.00 104.4775 25.25 105.2185 25.50 105.9620 25.75 106.7083 26.00 107.4576 26.25 108.2100 26.50 108.9656 26.75 109.7246 27.00 110.4873 27.25 111.2538 27.50 112.0243 27.75 112.7990 28.00 113.5782 28.25 114.3620 28.50 115.1507 28.75 115.9445 29.00 116.7437 29.25 117.5485 29.50 118.3594 29.75 119.1764 30.00 120.0000 30.25 120.8305 30.50 121.6682 30.75 122.5136 31.00 123.3670 31.25 124.2289 31.50 125.0996 31.75 125.9798 32.00 126.8699 32.25 127.7705 32.50 128.6822 32.75 129.6057 33.00 130.5416 33.25 131.4908 33.50 132.4542 33.75 133.4325 34.00 134.4270 34.25 135.4387 34.50 136.4688 34.75 137.5189 35.00 138.5904 35.25 139.6851 35.50 140.8050 35.75 141.9525 36.00 143.1301 36.25 144.3409 36.50 145.5885 36.75 146.8771 37.00 148.2117 37.25 149.5985 37.50 151.0450 37.75 152.5608 38.00 154.1581 38.25 155.8532 38.50 157.6684 38.75 159.6359 39.00 161.8051 39.25 164.2595 39.50 167.1614 39.75 170.9313 40.00 180.0000

[0066] This concept is applied in multi-purpose sealing module (20) where controlled gap between the upper seal beam (140) and the lower seal beam (150) can be generated and utilized for sealing of a variety of plastic film thicknesses as per requirement.

[0067] The multi-purpose sealing module (20) utilizes a common crank and crank arm mechanism innovatively for generating high seal force for some applications; very slow motion at the end of stroke for gentle sealing touch while sealing, moving upper seal beam (140) and lower seal beam (150) simultaneously by a common drive shaft (30) making it a well-balanced system capable to run at high speeds using which controlled Gaps can be generated for sealing of a variety of plastic film thicknesses as per requirements.

[0068] The description with the appended drawings is not intended to represent the only forms that may be developed or utilized using the inventive concept disclosed. It is to be understood that the disclosed embodiments are exemplary of the disclosure that may be embodied in various and alternative forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative for teaching one skilled in the art to variously employ the present invention.