JPH04114840A - Heat sealer - Google Patents

Abstract

PURPOSE:To facilitate change in peripheral speed at a time of sealing by a method wherein lateral heat sealing rolls are revolved at an anglular speed which is periodically changed by an irregular revolution transmitting mechanism, speed and period of revolution are changed by a changing mechanism and lateral revolution phase is changed by a phase adjusting mechanism. CONSTITUTION:When an AC variable servomotor 27 is revolved in a state that a revolution adjusting shaft 41 of a phase adjusting mechanism 39 is position fixed, an input shaft 28 starts to revolve, a transmission shaft 31 revolves through oblong gears 25, three gears 34 are revolved by a gear part 36, another gear 35 revolves through a rotary shaft 33, and an output shaft 30 is revolved by an teeth-engagement between the gear 35 and the gear part 37 to revolve a driving gear 30a. By this revolution, a pair of lateral heat sealing rolls 12 are revolved through a gear 17. With respect to the lateral heat sealing rolls 12, the speed of revolution on a main shaft 27a side is made to be variable by a speed changing mechanism 38, a range of speed of revolution M necessary for the main shaft 27a side is set, a speed of revolution having a period matching a pitch dimension P between sealings is selected among the speeds of revolution and a phase is displaced by a phase adjusting mechanism 39 to synchronize to a sealing timing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a heat sealing device used in film packaging machines and the like.

[Prior Art] Conventionally, as this type of film packaging machine, one having the structure shown in FIGS. 11 to 14, for example, is known.

In this conventional structure, the tray is a machine base, a holding frame 2 is provided on the side thereof, a film winding R around which a film F is wound is detachably provided on the holding frame 2, and a machine base I A film guide part 3 and a film folding part 4 are arranged on the upper part of the machine, and a film feed part 5, a shrink seal part 6, a horizontal seal part 77, and a cutter part 8 are provided from above on the front part of the machine.
The film F is pulled out from one film winding R, led out to the film folding part 4 via the film guide part 3, and is folded in half in the longitudinal direction by the U-shaped member 9 of the film folding part 4, and then the film F is folded in half in the longitudinal direction. 5 pair of feed rolls 10
The folded ends of the film F are then heat-sealed by a pair of vertical heat-seal rolls 11 of the shrink-seal section 6, and the film F is formed into a cylindrical shape by this vertical seal F, and the film F is then laterally sealed. The film F is heat-sealed in the transverse direction using a tank heat-sealing roll in section 7, and is driven by a pulse motor, a stepping motor, etc. as one of the driving means, and a bottom part is formed on the cylindrical film F by this tank seal F2. Then, a filling mechanism (not shown) fills the packaged object W, such as food, for example, and the film F is sent and heat-sealed again by the horizontal sealing section 7, and the packaged object W is sealed by the horizontal seal F2. This horizontal seal F2 is attached to the upper and lower horizontal seal parts 7.
Then, the horizontal seal F2 position is cut with a cutter portion 8, and the film is wrapped in a film and taken out and conveyed by a conveyor (not shown) or the like.

[Problems to be Solved and Attempted by the Invention] However, in the above-mentioned pillow type film packaging machine, as shown in Fig. 13.14, the film is The position of the lateral seal F2 of the lateral heat seal roll L with respect to F changes, that is, the pitch P between the seals changes, and the film F changes accordingly.
It is necessary to change the transfer speed (1)9 and change the circumferential speed (2)R of the lateral heat seal roll [from -1 to sealing time] in accordance with the transfer speeds V and l.

However, in the case of the above conventional structure, for example, the circumferential speed v4 of the lateral heat-sealing roll is changed by a variable speed motor, such as a pulse motor or a stepping motor,
The peripheral speed V8 of the horizontal heat seal roll ff12 is made to follow the film transport speed V,], but due to the characteristics of the motor, there is a limit to increasing the rotation speed, so the film F transport speed V8 is made to follow the film transport speed V,]. This method is disadvantageous in that it is subject to restrictions and may not be suitable for increasing the speed of seal packaging operations.

[Means for Solving the Problems] The purpose of the present invention is to solve these inconveniences. Continuous packaging is carried out by horizontally sealing with a seal roll, which includes: an inconstant rotation transmission mechanism that rotates the horizontal heat-sealing roll with periodic changes in angular velocity; and a variable speed m-ellipse that can vary the rotational speed of the horizontal heat-sealing roll. and a phase adjustment mechanism that can vary the rotational phase of the horizontal beat seal roll.

[Function] The tank heat seal roll is rotated by an inconstant rotation transmission mechanism with periodic changes in angular velocity, and the speed change mechanism changes the rotation speed and period of the tank heat seal roll, and the phase adjustment mechanism changes the tank heat seal roll. The rotation phase of the heat seal roll can be changed.

[Example] 1 to 10 show embodiments of the present invention.

Incidentally, the same reference numerals are used for the same parts as those in the structure shown in FIGS. 11 to 14 above.

Reference numeral 7 denotes horizontal sealing parts, which are arranged in two sets on the machine base 1, one above the other, and a bearing stand B is attached to the front of the machine stand 1, and one tank heat seal roll holder can be rotated when the bearing stand Ls is opened. A pair of upper and lower guide shafts U are fixedly protruded from each bearing stand B, a support plate is fixed between the tips of the guide shafts U, and a slide stand 16 is slidably installed between the guide shafts μ. , the other lateral heat sealing roll dryer is rotatably supported on the slide table 16, and gears U that mesh with each other are fixed to the lateral heat sealing roll 12 on one side and the bottom of the other tank heat sealing roll, respectively. Form a driven gear ffa in , attach the seal plate 12a to both lateral heat-seal rolls with bolts, and install the heat-insulating plate 12a with bolts 4, and incorporate a heater H in the lateral heat-seal roll dryer L. A power supply mechanism capable of supplying power from the outside is provided to the heater H, and an interval adjustment roll is provided which contacts the lateral heat seal rolls 12 and determines the gap between the lateral heat seal rolls and the seal plate 12a. An air cylinder device is disposed to press the slide table 16 on the support plate, and when a foreign object is caught in the gap between the lateral heat seal roll section and the seal plate 12a, the air cylinder device The piston 29a is pushed back to widen the gap between the seal plates 12a.

The housing is a non-uniform rotational transmission mechanism, which is installed inside the machine base 1. In this case, it consists of five sets of elliptical gears. The servo motor is installed, the input shaft is immersed in the casing, and the input shaft is rotated and the AC speed change servo motor is connected to the main shaft 2.
7a are connected by a joint B, one oval gear part is fixed to the input shaft rotation, and the output shaft (equipment) is bearing in the casing part.
A drive gear 90a is formed on the output shaft blade to mesh with the driven gear 17a of the gear 17. The elliptical gear is fixed, a holding body is fixed on the end side of the transmission subdivision, and a bearing is fixed so that the rotational position can be adjusted. A gear part is fixed to each of the parts, and a gear 5 is formed at the other end of the rotating shaft part, a gear part violet that can mesh with the three gear parts is formed on the transmission shaft, and the output shaft I is provided with a gear part 5. It is constructed by forming a meshing part that can mesh with three gear surfaces.

The transmission mechanism is a transmission mechanism in which an AC variable speed servo motor is incorporated.

The blade is a phase adjustment mechanism, and in this case, there is a
A C servo motor button is installed, a rotation adjustment shaft 41 is rotatably supported on the casing part, the main shaft of the AC servo motor holder is connected to the rotation adjustment shaft 41 at a joint center, and a button is attached to the outer periphery of the holding body part. Forming a gear part, rotation adjustment axis 4! A gear portion 6 is formed in the structure.

Since this embodiment has the above configuration, the A and C servo motors a are stopped and the rotation adjustment shaft 4 of the phase adjustment mechanism blade is adjusted. When the AC variable speed servo motor I is rotated with the position fixed, the input shaft rotates, and the transmission shaft m is
rotates, the three gear parts rotate due to the gear part A, the gear surface rotates via the rotating shaft part, and the output shaft I rotates due to the meshing of the gear I and the gear part, thereby driving the drive gear 90a. will rotate, and this rotation will cause the pair of horizontal heat seal rolls to rotate via the gear 17.

In this case, even if the main shaft 27a of the variable speed servo motors A and C rotates at a constant angular velocity, the output shaft blade due to the elliptical gears 6 and 5 will have an angular velocity as shown in the angular velocity ratio diagram shown in FIG. It will rotate while changing.

In addition, when the rotational speed of the output bacteria is changed by a transmission mechanism, in this case a variable speed AC servo motor, the output shaft (capital) is formed at various periodic circumferential velocities and period T1, as shown in Fig. 10.
It will rotate with T7, T3..., that is, for example, a will rotate at 900 rpm on the main shaft 27a side, and b will rotate at 900 rpm on the main shaft 27a side.
A side is 600 rpm, c is main shaft 27 a flu is 30
When rotating at 0 rpm, the point forming the output shaft I will rotate with a circumferential speed as shown in this diagram.

At this time, when the rotation adjustment shaft 4 of the phase adjustment mechanism (to) is rotated by a predetermined amount, the transmission shaft 27a of the variable speed AC servo motor is stopped and the position is fixed, so the gear part M4S
The holding body residue rotates through the rotation of the holder, thereby causing a shift in the phase lead/lag of the lines a, b, and c in FIG. 10, for example.

For this reason, as shown in Fig. 13.14, for example, in a film packaging machine, when the size or content of the packaged object W changes, the position of the tank seal F2 of the tank heat seal roll [in other words, the pitch dimension between seals] with respect to the film F is changed. When P changes, the transfer speed ``3'' of the film F is changed, and the circumferential speed ``8'' of the lateral heat seal roll [at the time of sealing] is changed following this transfer speed v8, for example, as shown in FIG. Assuming that the number of revolutions M is required as the number of revolutions corresponding to the circumferential speed (8) of the horizontal heat sealing roll L at the time of heat sealing, first, the main shaft 27a is
The rotation speed on the main shaft 27a side is varied, and a rotation speed region is set in which the necessary rotation speed M is obtained on the main shaft 27a side, and from this rotation speed, a cycle that matches the above-mentioned seal pitch dimension P, for example T
It is only necessary to select a rotation speed having a rotation speed of 3, and shift the phase using the phase adjuster 11!9 to synchronize with the sealing timing.

Therefore, the rotation of the horizontal heat sealing roll can be rotated with periodic changes in angular velocity by means of an inconstant rotation transmission mechanism, and the rotational speed and period of the horizontal heat sealing roll can be changed by means of a transmission mechanism, and the phase The rotation phase of the horizontal heat-sealing roll can be changed using the adjustment mechanism blade, and as a result, the horizontal heat-sealing roll relative to the film F can be adjusted as the size and content of the packaged object W changes.
Since the horizontal seal F2 position, that is, the inter-seal pitch dimension P changes, the transfer speed V of the film F is changed, and the circumferential speed V at the time of sealing of the horizontal heat seal roll is adjusted according to this transfer speed (9). It is easy to follow and change.

Note that the present invention is not limited to the above embodiment, and in the above embodiment, the elliptical gear 252 is used as the nonuniform rotational transmission mechanism U.
5 is used, but other non-circular gears or other transmission mechanisms that transmit transmission with changes in angular velocity may be used, or a drive source other than the AC variable speed servo motor may be used, or a transmission mechanism may be used. The output may be configured separately from the AC variable speed servo motor, or may be a phase adjustment mechanism of other manual structure, and may also be applied to packaging machines other than the above-mentioned and low-speed packaging machines. The design can be modified as appropriate.

Effects of the Invention As described above, the present invention is capable of rotating the tank heat-sealing roll with periodic changes in angular velocity using an inconstant rotation transmission mechanism, and controlling the rotational speed and cycle of the tank heat-sealing roll using a speed change mechanism. The rotational phase of the tank heat-sealing roll can be changed using a phase adjustment mechanism, and as a result, the lateral sealing position of the tank heat-sealing roll relative to the film can be adjusted as the size and content of the packaged items change, i.e. Since the pinch size between the seals changes, it is possible to easily change the transfer speed of the film and follow this transfer speed to change the circumferential speed of the tank heat seal roll at the time of sealing.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partial plan view, FIG. 2 is a partial front sectional view, FIG. 3 is a partial plan sectional view, and FIG. 4 is a partial cross sectional view. , Fig. 5 is a partial cross-sectional view thereof, Fig. 6 is a partial vertical cross-sectional view, Fig. 7 is a cross-sectional view thereof, Fig. 8 is a cross-sectional view thereof, Fig. 9 is an angular velocity ratio diagram, and Fig. 10. 11 is an overall front view, and FIGS. 12 and 13.14 are explanatory diagrams of heat sealing. F... Film, W... Item to be packaged, [... Tank heat seal roll, ■... Inconstant speed rotation transmission mechanism, Field...
Speed change mechanism, (to)...phase adjustment mechanism. Filed on August 31, 1990: Nippon Seiki Co., Ltd. Inventor: Takahashi

Claims (1)

[Claims] Continuous packaging is carried out by overlapping both folded edges of a continuously transported film and sealing it vertically, and sealing it horizontally using a horizontal heat-sealing roll, in which the horizontal heat-sealing roll is rotated at an inconstant speed with periodic changes in angular velocity. A heat sealing device comprising: a rotational transmission mechanism; a speed change mechanism capable of varying the rotational speed of the horizontal heat sealing roll; and a phase adjustment mechanism capable of varying the rotational phase of the horizontal heat sealing roll.