JP3798284B2 - Sealing device suitable for high speed rotation. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-speed rotation type long seal device for cross-welding thermoplastic tube films at equal intervals.
[0002]
[Problems to be solved by the invention]
The bag-filling and packaging machine transports the belt-like film in the longitudinal direction while rolling it into a cylindrical shape, while carrying the packaged items into the tube film at equal intervals, and a pair of seal bars between the packaged products. The tube film is sequentially heated and sealed for a predetermined time to create a sealed package. Conventionally, as a long seal device as described above, there is a configuration shown in FIG. .
[0003]
That is, when supported by the crankpin 2 provided at the eccentric portion of the main gear 1, the vertically long flange 3 is slidably supported on the crank sleeves 6 and 7 of the auxiliary gears 4 and 5 meshing with the upper and lower sides of the main gear. 1 in the direction of the arrow 8 and rotational movement 9 in the direction of the arrow of the driven gears 4 and 5, the seal bar 10 on one side fixed to the flange 3 and the seal bar on the other side fixed to the sleeve 6. 11 are brought close to each other on the opposite circular orbits, and the tube film is pressed and heated by the two seal bars 10 and 11 for a predetermined time. Reference numeral 12 denotes a spring that provides cushioning to the clamping pressure of the seal bar.
[0004]
Due to the recent improvement in parts performance, packaging machines are being improved at higher speeds. However, the continuous meshing sound of the gears in the sealing device has been increased by higher speeds, causing discomfort to workers. There is an increase in frictional heat at the slide part, and there are various problems in speeding up beyond the limit.
[0005]
[Solution]
In order to reduce the adverse effects of speeding up, the present invention engages two gears fixed to each of the main shaft and the driven shaft supported between both walls of the sealed casing in the casing, and the main shaft outside the casing. And means for fixing the crankpin to both ends of the driven shaft and rotating the driving pinion engaged with any one of the gears from the outside of the casing to rotate the main shaft and the driven shaft in opposite directions. Between the two main guides connected to the main crank pins at both ends, a driven slider connected to the driven crank pins at both ends of the driven shaft and slidably supported by the two main guides, and between the two main guides One side seal bar to be installed and the other side seal provided between the driven sliders so as to face the seal bar Constituted by and over.
[0006]
The device arranges two gears that mesh with each other in a sealed casing, and projects both shafts of the two gears, that is, the main shaft and the driven shaft, on both sides of the casing, Thus, the pair of seal bars are moved relative to each other, and the sealed casing can prevent the continuous meshing sound of the two gears from divergence. Improve value. The casing is ideally completely sealed. However, since the sound is prevented from diverging with a slight opening, a casing having an opening that does not exceed the limit is applicable to the sealing described in the claims.
[0007]
When the lubricant is stored in the casing, the friction of both gears is reduced to reduce noise, heat generation due to friction can be prevented, and a high speed environment can be achieved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall view of the apparatus, in which a middle gear 21 and upper and lower gears 22 and 23 are meshed with each other inside a sealed cubic casing 20 while shafts 31 and 32 of the respective gears are arranged. , 33 are supported on both side walls of the casing 20 so as to be rotatable and parallel to each other, and crank pins 24, 25, and 26 are fixed to both ends of the three shafts, respectively. Is integrated.
[0009]
As shown in FIG. 2 which is a side view of the drawing, when the three gears 21, 22, and 23 are meshed with each other and rotational power is applied from the driving pinion 28 to the base gear 27, the same number of teeth is obtained. The three gears are linked at the same speed, the crank pin 24 fixed to the end of the middle main shaft 31 revolves clockwise, the crank pin 25 at the end of the driven shaft 32 and the crank pin at the end of the auxiliary shaft 33. Both 26 revolve in a counterclockwise direction.
[0010]
As shown in FIG. 3 which is a plan sectional view of the drawing, a servo motor 35 is installed through a frame 34 on the outside of the wall of the three-dimensional casing 20 having a black cross section. The motor has a controllability for periodically shifting the output speed, and this control can also be performed using, for example, an inverter device. Therefore, a small-diameter pulley 36 fixed to the shaft of the motor 35 and a large-diameter pulley 38 of the driving shaft 37 supported by the casing 20 are linked via a timing belt 39, and the power of the servo motor 35 is explained with reference to the driving force already described. This is transmitted as rotational power from the pinion 28 to the main shaft 31 via the base gear 27, and the lower end of the main guide 40 is supported around each crank pin 24 at both ends of the main shaft 31 as described later.
[0011]
That is, as schematically shown in FIG. 1, the main guides 40 supported by the crankpins 24 at both ends of the main shaft 31 support and support the seal bar 51 on one side at the upper end, while the crankpin 25 of the driven shaft 32 and the auxiliary shaft The seal bar 52 on the other side is supported on the upper end of the slider 41 supported by the crank pin 26 of the shaft 33. More specifically, as shown in FIG. 4, the main guide 40 is made of a vertically long plate material, and sleeves 42 and 43 fixed to the upper and lower sides of the main guide 40 slidably hold a slider 41 made of two bars . The combined intermediate longitudinal slit 40 driven crank pin 25 is engaged with a said main guide 40, the pin receiving plate 41 a of the crank pin 25 to pass through is fixed to the slider 41 consisting of two bars. The main guide 40 moves up and down by the clockwise revolving motion of the main crank pin 24 engaged with the sleeve 43, but the upper and lower pin receiving plates 41 a and 41 b of the driven slider 41 with respect to the main guide 40. The slider 41 that moves up and down by the revolving motion of the engaged driven crank pin 25 and the auxiliary crank pin 26 moves in the reverse direction symmetrically with the movement of the main guide 40 . As a result, the upper and lower seal bars 51 and 52 are opened and closed while performing a relative circular motion, and are pressed against each other in a small region to sandwich and heat-seal the thermoplastic film.
[0012]
FIG. 5 is a cross-sectional view of one side seal bar. A seal bar 52 including a pipe heater 44 and a cutter 45 is supported on a base material 46 via a guide pin 47, and the sealer 52 and the base material 47 are A tension spring 48 is interposed therebetween. For this reason, a slight pressure contact time due to compression of the spring 48 can be formed on the pair of upper and lower seal bars 51 and 52 which are placed in FIG. Although the names of the main guide 40 on one side and the slider 41 on the other side are given, there is no problem even if these names are interchanged.
[0013]
As shown in FIGS. 1 and 2, the sealed casing 20 stores therein a lubricant 60 such as machine oil. When the oil is stored at least so that the lowermost gear 23 can be immersed, the oil pumped up by the gear 23 spreads over the entire gear region and silences the frictional noise of each gear and prevents seizure of the rotating slide portion, so that the film sealing speed increases Promote.
[Brief description of the drawings]
[Fig. 1] Overall front view of the casing in cross section [Fig. 2] Side view [Fig. 3] Cross sectional view along line III-III in the previous diagram [Fig. 4] Relationship between the main guide and slider [Fig. Cross-sectional view of seal bar [Fig. 6] Explanatory drawing of conventional device [Explanation of symbols]
20 ... Sealed casing 21, 22, 23 ... Gear 24 ... Main crank pin 25 ... Driven crank pin 26 ... Auxiliary crank pin 27 ... Base gear 28 ... Drive gear 31 ... Main shaft 32 ... Drive shaft 33 ... Auxiliary shaft 35 ... Servo motor 40 ... Main guide 41 ... Follow sliders 51, 52 ... Seal bar 60 ... Lubricant

Claims (3)

Gears fixed to each of the main shaft and driven shaft that are rotatably supported in parallel between both walls of the sealed casing are meshed inside the casing, and crank pins are fixed to both ends of the main shaft and driven shaft outside the casing. And means for rotating the driving pinion engaged with one of the gears from the outside of the casing to rotate the main shaft and the driven shaft in opposite directions, and two connected to the main crank pins at both ends of the main shaft. The main guide, a rod-like driven slider connected to the driven crank pins at both ends of the driven shaft and slidably supporting the two main guides, a one-side seal bar installed between the two main guides, An apparatus constituted by the other side seal bar provided between the driven sliders so as to face the seal bar. An auxiliary gear which is fixed to the auxiliary shaft for supporting the both walls of the surrounding housing, with engaged and a wheel fixed to the main shaft within said sealed casing, and an auxiliary crank pin fixed to the auxiliary shaft ends, respectively, the main The apparatus according to claim 1 , wherein the driven slider is supported by a crank pin of a driven shaft separating the crank pin .   The apparatus according to claim 1 or 2, wherein a lubricant is stored in a sealed casing.