JPH01139304A - Belt conveyor for box motion type heat cutting and sealing apparatus of horizontal bag making and filling packer - Google Patents

Abstract

PURPOSE:To apply a belt conveyor for packing of a short article, a small article, a heavy article, etc., by varying the length of a transferring face to fill a clearance brought about, when a lower heater of a heat-cutting and sealing apparatus sinks, by the transferring face of the belt. CONSTITUTION:An endless belt 1 is hanged to make a detour under a lower heater 2 out of both upper and lower heaters 2, 3 with a box motion and to form table surfaces 1a, 1b at both sides of the lower heater 2. A cam plate 12 guides a swing lever 6 to close the upper part of the lower heater 2 by a belt roll 4, when the heaters 2, 3 open and also guide the swing lever 6 to open the upper part of the lower heater 2 by the belt roll 4 ahead of the time when the heaters 2, 3 close. And further, a belt-tension means 13 is provided to allow the endless belt 1 to feed corresponding to the closed lower heater of the belt roll 4 at the top of the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a product delivery conveyor in a horizontal form-fill-seal packaging machine such as a horizontal pillow packaging machine, and particularly to a belt conveyor incorporated in a box motion type heat-melting sealing device.

<Prior art and its problems> First, a box motion type heat-melting sealing device of a conventional horizontal bag-forming-filling-sealing machine will be briefly explained. This device has a pair of heaters that move in box motion. Here, to explain the operation of the box motion, the upper and lower pair of heaters open vertically, close at the upstream position when aligned with the registration mark on the wrapping paper, and move a predetermined distance in synchronization with the speed of the wrapping paper. This action opens up and down again at the downstream position and returns to the upstream position, which has the advantage of allowing more time to heat-seal the wrapping paper compared to a rotary cutter.

There are various mechanisms for box motion of a pair of upper and lower heaters. For example, there is a structure in which both ends of the upper and lower heaters are attached to connecting links of a double crank mechanism, and a structure in which both ends of the upper and lower heaters are attached to a front cam (
There is a structure (for example, Japanese Utility Model Publication No. 82-5t910) in which the flat circular cam groove of the front cam is rotated by a crank.

The box motion of the upper and lower heaters means that
On the upstream and downstream sides of the heater, conveyors are required that are close to the heater and whose speeds are synchronized to substantially change the table area. Both are still in use today. One is an endless roller conveyor, in other words, an endless conveyor chain is wound vertically left and right, and a large number of rollers are wound around the conveyor chain, and the number of rollers is thinned out at regular intervals. ,
The structure is such that the lower heater appears and disappears from the space where the core has been thinned out, and the other one is a belt conveyor, and the middle of the belt conveying surface is depressed with a gap open, and this gap is It has a structure in which a conveyor belt is wrapped around it so that it moves, and a lower heater comes out and disappears from the gap.

Roller conveyors are difficult to assemble, make a lot of noise, and have gaps between the rollers, which may turn customers off. and escapes downward,
Even if the packaged item is a short item, small item, heavy item, or bulk item, the packaged item will not fall from the part where the roller is not provided.

On the other hand, belt conveyors operate quietly, but if the packaged items are small, the separated packaged items will fall onto the table surface on the downstream side when the lower heater sinks into the gap in the middle of the belt conveyance surface. It cannot be applied to the packaging of small items, etc., as it has the disadvantage of Therefore, there is an idea that when the lower heater is submerged from the table surface, the gap in the middle of the belt conveyance surface is closed so that it can be applied to packaging small articles, etc. (Utility Model Publication No. 49-28133).

However, in this invention, when the belt is operated at high speed, the rising speed of the lower heater becomes faster, and the lower heater strongly flips up the small roller that closes the gap in the middle of the belt conveying surface. Small rollers have low durability and require replacement after a short period of time. It also becomes a source of noise. Furthermore, small rollers do not actively feed the packaged items, so even though they can wrap short and small items, there is a limit to their size, and short items below a certain size However, when it comes to small items, there is also the problem that the packaged items may fall into gaps in the middle of the belt conveyance surface. Furthermore, there is a possibility that the bottom surface may be damaged depending on the type of the packaged item.

OBJECTS OF THE INVENTION The present invention is capable of handling short items and small items by changing the length of the conveying surface so that the belt conveying surface almost completely fills the gap when the lower heater of the heat-sealing device goes down. It is an object of the present invention to provide a belt conveyor for a box motion type heat-melting sealing device of a horizontal bag-forming-filling-sealing machine that can be applied to packaging heavy items.

Means for Achieving the Above Object> To explain the belt conveyor for the box motion type heat-sealing device of the horizontal bag-forming-fill-sealing machine of the present invention, as shown in FIG. During,
An endless belt 1 is wound around the bottom of the lower heater 2 and forms table surfaces 1a and 1b on both sides of the lower heater 2. -1 winding is provided so that it moves linearly back and forth in the belt conveyance direction in synchronization with the horizontal component speed of the box motion of the two guiding belt rolls 4 (and/or 5) and the heater 2.3. A heater block 11 (or 16) is provided at both ends of a heater block 11 (or 16) rotatably supported at both ends by swing levers 6 (and/or 7) pivotally connected to a pair of left and right movable blocks 8, respectively, and which performs a box motion operation. It is designed to be swung by a cam plate 12 that is
The cam plate 12 is arranged so that when the heater 2.3 is opened, the belt roll 4 (and/or 5) closes the swing lever 6 (and/or 5) of the lower heater 2.
or 7), and when the heater 2.3 closes, the belt roll 4 (and/or 5) guides the swing lever 6 (and/or 7) to open one side of the lower heater 2. 7), and furthermore, the belt roll 4 (and/or 5)
The apparatus is characterized in that a bell extension means 13 is provided which allows the endless bell 1 to be extended in response to closing the upper part of the lower heater 2.

Next, the operation will be explained with reference to FIGS. 1 to 4.

When the heater 2.3 and the cam plate 12 perform a box motion in the state shown in FIG. The state changes in the order of FIG. 2, FIG. 3, and FIG. 4, and returns to the state of FIG. 1 again.

FIG. 1 shows a state in which the heater 2.3 of the heat sealing device is located at the second flow end P2 of the box motion and is open. When the heater block 11 descends, the cam plate 12
Cam follower 9.1 by cam grooves 12a and +2b of
0 is opened, and the bell pivoted to the upper end of the swinging lever 6.7] and the roll 4.5 approach and close three sides of the lower heater 2 of the heat-sealing device sunk below the table surface. .

FIG. 2 shows a state in which the heaters 2.3 have moved horizontally to position P3 and are approaching each other at a level just before interfering with the belt roll 4.5. The belt roll 4.5 is spaced apart so as not to interfere with the heater 2. A cam plate 12 is mounted integrally with the heater 2, and a cam follower 9.10 is formed by the cam grooves 12a and 12b.
is closed and the belt roll 4.5, which is pivoted on the upper end of the swing lever 6.7, is separated.

FIG. 3 shows a state in which the heater 2.3 has moved horizontally to position P4 and is performing lateral sealing and cutting. The heater 2 that has ascended between the belt rolls 4.5 that are maintained apart, and the heater 3 that has descended in opposition to this, sandwich the packaging film f between the items W to be packaged and heat seal them. Part of the heater 3 of the heating melt sealing device
A cutter 14 incorporated in the cutter 14 cuts the packaging film f in accordance with the registration mark.

FIG. 4 shows the heater 2.3 starting to open when it moves to position P5 and fully opening when it moves to the downstream end of the box motion P6. The cam plate 12 is lowered together with the heater 2, and the cam followers 9 and 10 are opened by the cam grooves 12a and 12b, so that the belt roll 4
．． 5 is in a close state and closes the upper part of the lower heater 2.

Subsequently, when the heater 2.3 performs a box motion, the belt roll 4.5 returns to the state shown in FIG. 1 with the upper part of the lower heater 2 closed. At this time, one packaged item W on the belt conveyor passes between the belt rolls 4.5, but the belt rolls 4.5 are connected to the lower heater 2.
Since one side is closed, even heavy short articles or small articles can pass between the belt rolls 4.5 without falling or falling between the belt rolls 4.5.

<Embodiment...FIGS. 1 to 4> The explanation of this embodiment will be simplified so as not to overlap with the explanation of the essential requirements of the structure of the invention described in the section of the means for achieving the object.

The endless belt 1 is wound around a large-diameter drive roll 24 rotated by a motor 23, and detours below the drive lower heater 2. On both sides of the lower heater 2, belt rolls 26.4 are placed around a table. A surface 1a is formed, and a table surface 1b is formed by the belt 3:30-rule 5.

Both ends of the belt roll 4.5 are pivotally supported on the upper end of a swinging lever 6.7, and are approached and separated by swinging the swinging lever 6.7. The swing lever 6 is pivotally connected at its midpoint to a pair of left and right movable blocks 8 which are provided so as to be movable. Cam followers 9.10 provided at the lower end of each swing lever 6.7 are connected to cam grooves 12a and 12b of a cam plate 12 provided at both ends of a heater block 11 that supports the lower heater 2 and performs a box motion operation. is mated to.

The cam grooves 12a, 12b are made up of a lower parallel portion where the distance between each other is kept narrow, an upper parallel portion where the distance between each other is kept wide, and an intermediate inclined portion connecting the lower parallel portion and the upper parallel portion. When the heater 2 is at the required level □ below the belt roll 4.5 in the lower parallel part, the cam followers 9.10 are guided to be held close to each other, and the middle In the inclined part, the cam followers 9.10 are guided apart during the rising process of the heater 2 at a level r slightly below the belt rolls 4.5, and in the upper parallel part the cam followers 9.10 are guided apart. 10 continues to be guided apart.

The swinging lever 6.7 supporting the belt roll 4.5 is a pair of left and right movable blocks 8 provided to move linearly back and forth in the belt conveyance direction in synchronization with the horizontal component velocity of the box motion of the heater 2.3. They are each centered in the middle. Cam plate 1 that swings these swing levers 6.7
2 is configured to operate in unison with the box motion of the lower heater 2. When the heater 2.3 opens up and down, the cam plate 12 descends and the cam follower 9.1
0 are regulated and separated by cam grooves 12a and 12b, and the belt roll 4.5 closes the upper part of the lower heater 2 that has been lowered. When the heater 2.3 closes, the cam plate 12 rises and the cam follower 9.10 approaches the belt roll 4 while being regulated by the cam grooves 12a and 12b.
．． 5 are spaced apart from each other, and the lower heater 2 is moved between the swing arms 13a and 13b to lift up the swing arms 13a to half the height of the products on the conveyor.

A stage 13 is attached, and the belt roll 4.5 is separated.
Length of endless belt 1 when moving one step apart or approaching each other
Make adjustment 1.

In addition, as can be seen from the above explanation, the present invention (
The belt conveyor is box motion type heated and fused.
Since the present invention is incorporated into one sealing device, the heat-melting sealing device will be explained below.

The heat-melting sealing device shown in this embodiment is constructed with a novel mechanism of a type that has never been seen before, and is capable of horizontal sealing and cutting while performing box motion. The heaters 2.3 are respectively installed in heater blocks 11.1B that are fitted and guided by four wooden guide rods 15.15 that are integrally erected on both sides of the belt conveyor, and are moved close to each other by air cylinders 17.18.・They are now separated. Guide rod 15.1
5 is erected on a movable table 18, and the movable table 19
is guided by the horizontal guide rod 20, and
It is screwed onto a ball screw 21, and as the ball screw 21 is rotated by a servo motor 22 with a speed reducer, it is reciprocated parallel to the conveyance direction of the belt conveyor. It is erected on a movable table 22 that is screwed onto a ball screw 21 and moved horizontally. Position PIf is the upstream end of the box motion, and is the standby position of the heater 2.3. The servo motor 22 is a heater 2.3
is waiting at the upstream end P2 of the box motion, and when 1/jima m of the packaging film f comes to a position P1 slightly upstream from the upstream end P, an upstream position (not shown) detects this coincidence. When the heater 2.3 moves to position P3, it completes speed synchronization with the flow speed of the packaging film f, and from then on,
The speed is synchronized until the heater 2.3 moves to position P5,
Furthermore, when the heater 2.3 moves to position P5, it decelerates rapidly, and when the heater 2.3 coincides with the downstream end P6 of the box motion, it stops rotating, and then immediately reverses rotation with a rapid rise. Then, the heater 2.3 rotates in the opposite direction until it returns to the flow end P2 of the box motion.

The approach of heater 2.3 is -1- of box motion.
This is performed at the upstream end of the flow end P2 when the heater 2.3 starts moving, and when the heater 2 moves to the position P3, the heater 2 is in a state of rising to the level immediately before interfering with the belt roll 4.5. It has been adjusted as follows. Furthermore, the heaters 2.3 are located at position P.
The separation starts when the box motion moves to the downstream end P6, and ends when the box motion moves to the downstream end P6. Therefore,
The heater 2.3 performs a box motion in which the expansion and contraction of the air cylinders 17 and 18 and the movement of the movable table 22 are combined.

Next, a combined operation of the belt conveyor of the present invention and the box motion type heating fusing opening device will be briefly described.

As shown in FIG. 1, when the heater 2.3 is on standby at the upstream end P2 of the box motion, the belt roll 4
．． 5 closes the negative side of the lower heater 2 that has been lowered,
When the registration mark m of the packaging film f comes to the position PI, this coincidence is detected.A detection signal from a registration mark sensor installed at the flow position (not shown) causes the servo Φ motor 2 to
2 rapidly rises and rotates, and the air cylinders 17 and 18 are extended and activated within a short period of time, causing the heaters 2 and 3 to rotate.
begins to approach.

Then, as shown in FIG. 2, the heater 2.3 is at position P.
3, these heaters 2.3 synchronize with the flow velocity of the packaging film f, and at this time, these belt rolls are moved slightly below the belt rolls 4.5 so as not to interfere with the heaters 2 which are approaching. 4.5 completes the opening operation. The speed tuning is performed by heater 2. as shown in FIG.
3 moves to position P5. Subsequently, as shown in FIG. 3, when the heater 2.3 moves to position P4, the heater 2.3 clamps the packaging film f and heat-seals it, and the cutter 14 aligns with the registration mark. Cut the packaging film f.

Then, as shown in FIG.
5, these heaters 2.3 begin to open and the heaters 2.3 reach the downstream end P of the box motion.
6, it is completely opened, and at the same time, the cam plate 12 descends together with the heater 2, so that the belt roll 4.5 closes the north part of the lower heater 2.

Subsequently, the servo motor 22 immediately rotates rapidly in the opposite direction, so that the heater 2.3 remains open and the belt roll 4.5 remains closed above the lower heater 2. The state returns to the state shown in FIG.

This completes one cycle of lateral seal cutting, and is repeated thereafter.

Peripheral scope of the present invention In the above embodiment, one side of the five-part heater 2 is closed by moving the belt roll 4.5, but it is possible to move only one side of the belt roll 4.5. When the lower heater 2 is lowered, the upper part thereof may be closed. In that case, the belt roll on the non-movable side is provided in the conventional position so as not to interfere with the rise of the lower heater 2, and the belt roll on the movable side is moved to the lower part by swinging the swinging link with a plate cam. Make sure the top of the heater can be closed.

Both ends of the belt roll 4.5 are pivoted to the lower end of a swinging lever 6.7, and the middle portions of the swinging levers 8-6 and 7 are pivoted to the movable block 8, and further swinging. The upper end of the plate cam 12 may be engaged with a plate cam 12 hanging upside down from both ends of the upper heater plate 16.

In the example, a new mechanical mechanism is proposed for the mechanism that provides the vertical heater 2.31 box motion, but the mechanism that provides the various box motions described in the prior art section at the beginning is also proposed. It is possible to adopt

<Effects of the Invention> As explained above, according to the belt conveyor for the box motion type heat melt sealing device of the horizontal bag making, filling and packaging machine of the present invention, at least one side of the belt conveyor of the lower heater of the box motion type heat melt sealing device The belt roll is supported by a swinging lever pivotally connected to a movable block provided so as to move in synchronization with the horizontal component speed of the box motion, and the swinging lever /<- is provided on the heater block. When the upper and lower heaters are opened, the swing lever is swung so that the belt roll moves above the lower heater, and the upper and lower heaters close. Sometimes, in advance of this, a swinging lever is swung so that the belt roll retreats from above the lower heater, and a belt tensioning means is attached to adjust the length of the endless belt in accordance with the opening and closing of the upper and lower heaters. Since the structure is configured to Since the length of the conveying surface is changed so that the belt conveying surface almost completely fills the gap when the belt is closed, even heavy short or small items will not fall between the belt rolls or fall. It is possible to realize a horizontal bag-form-fill-seal packaging machine that can pass smoothly between belt rolls without dripping and is suitable for packaging short items, small items, heavy items, etc.

[Brief explanation of the drawing]

FIGS. 1 to 4 illustrate a belt conveyor for a box-motion heat-sealing device for a horizontal bag-forming-fill-sealing machine according to an embodiment of the present invention. It is a schematic sectional view showing the process order of the structure incorporated into the mold heating melt-cutting sealing device. l@φ Endless belt, 1a, 1b...Table surface, 2.3...Heater, 4.5...Belt roll 6, 7...φ swinging lever, 8--Movable block, 11 ... Heater block, 12 ... Cam plate, 13 ... Belt tension means, 16 ... Heater block, Patent applicant Kawashima Seisakusho Co., Ltd.

Claims (1)

[Claims] In the upper and lower heaters that perform box motion, an endless belt is wound around the lower part of the lower heater and forms a table surface on both sides of the lower heater. Among the two belt rolls that guide the winding of the endless belt at positions close to each other on both sides, both ends of at least one belt roll are pivotally supported by a swinging lever, and the swinging lever is connected to the box motion of the heater. The heater block is pivotally connected to a pair of left and right movable blocks that are provided to move linearly back and forth in the belt conveying direction in synchronization with the horizontal component speed of the heater block, and each swing lever is provided at both ends of the heater block that performs box motion operation. The cam plate guides the swing lever so that the belt roll closes above the lower heater when the heater is opened, and when the heater is closed. , in advance of this, the belt roll guides the swinging lever to open the upper part of the lower heater, and further, in response to the belt roll closing the upper part of the lower heater, the endless belt is fed out. A belt conveyor for a box motion type heat-melting sealing device of a horizontal bag-forming-filling-sealing machine, characterized in that it is equipped with a permissible belt tension means.