JPH031362Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a bag making and packaging machine, that is, a packaging machine that packs products into bags while forming packaging bags.

(Prior art) In general, packaging machines for various products include bag-feeding packaging machines that supply pre-formed packaging bags, place products into the bags, and seal the bags, and bag-feeding packaging machines that feed pre-formed packaging bags and then seal the bags. There is a bag-forming and packaging machine that inserts and seals products, and the latter packaging machine is usually configured as follows.

That is, this type of bag making and packaging machine includes a folding device that folds a band-shaped film sheet made of vinyl or the like pulled out from a film roll set in a roll receiving section so that both side edges overlap in the center; A center heater that thermally welds the overlapped parts of the film to form a cylindrical body, and a center heater that holds this cylindrical body in the width direction and feeds it by a fixed size at a time, cuts the cylindrical body, and seals the cut end. The configuration includes a feeding device that While the feeding device is drawing out the cylindrical body to a certain size, the object to be packaged is placed inside the cylindrical body, and the bottom of the cylindrical body is sealed by a cross heater provided in the feeding device. At the same time, the inlet of the cylindrical body into which the object to be packaged was previously loaded is sealed and separated from the connecting portion, so that the object to be packaged is carried out as a product packed in bags.

However, conventionally, the center heater is continuously pressed against the overlapped portion of the folded film sheet to form a cylindrical body while the film sheet is being fed by a feeding device. However, since the above-mentioned feeding device is generally driven by a motor via a crank mechanism, the feeding speed for feeding the film sheet is not constant, and therefore, when the heating temperature of the center heater is increased, the feeding speed becomes slower. If the heating temperature of the center heater is lowered, the film sheet will not be completely welded when the feeding speed increases. It was difficult to control the heating temperature of the center heater, such as seat defects. Furthermore, since the sheet is fed with the center heater pressed against the film sheet, the melted portion of the sheet is dragged by the center heater, resulting in poor finish.

(Purpose of the invention) The present invention is to deal with the above-mentioned problems in conventional bag making and packaging machines, and by intermittently pressing the heater means such as a center heater against the film sheet, the heater means can be pressed against the film sheet intermittently. By keeping the time of contact with the film sheet approximately constant regardless of the film sheet feeding speed, inconveniences such as the sheet melting when the feeding speed is slow or poor welding occurring when the feeding speed is high are eliminated. Another object of the present invention is to prevent poor finishing caused by the heater means dragging the melted portion of the film sheet.

(Structure of the invention) That is, the bag making and packaging machine according to the present invention includes a roll receiving device for setting a film roll, and a film sheet pulled out from the film roll so that both side edges overlap at the center. a folding device for folding the folded film sheet; a heater means for forming a cylindrical body by being pressed against the overlapping part of the folded film sheet and thermally welding the overlapping part; A configuration including a feeding device comprising a pair of clamping members that are driven by a motor via a crank mechanism to feed the cylindrical body in the longitudinal direction, cut the cylindrical body, and seal the cut end, a driving means for intermittently pressing the heater means against the overlapping portion of the film sheet at a timing when an overlap occurs while the film sheet is being fed by the feeding device; and a heater means driven by the driving means. a sensor for detecting the position; and a control means for stopping the driving means when the sensor detects separation of the heater means from the overlapped portion of the film sheet after the feeding device stops feeding the film sheet. It is characterized by having

According to such a configuration, while the film sheet is being fed by the feeding device, the heater means is intermittently pressed against the overlapping portion of the sheet, so that the contact time of the heater means to the film sheet is limited to the length of the film sheet. It remains approximately constant regardless of the sheet feeding speed.
Therefore, by setting the heating temperature of the heater means at a temperature at which the film sheet is reliably welded within the above-mentioned certain period of time, the film sheet will not be heated too much and part of it will melt when the feeding speed is slow. Problems such as incomplete welding when the feed speed is high or when the welding speed is high are avoided. Furthermore, since the heater means is pressed intermittently, poor finish caused by dragging the joints of the film sheets is prevented.

Moreover, since the timing at which the heater means is pressed by the driving means is the timing at which an overlap occurs in the overlapping portion, there is no occurrence of a non-welded portion. The driving means is stopped when the film leaves the film sheet.
This prevents the sheet from melting due to stopping the feeding of the film sheet while the heater means is pressed.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 3 show the front, side, and back sides of the bag making and packaging machine 1, respectively. As shown in these figures, the packaging machine 1 has a hollow box-shaped machine frame 2.
Film roll receiving part 1 provided at the upper rear part of
0, the film folding section 20 provided at the upper front of the machine frame 2, the center seal section 30 provided at the front of the lower part of the folding section 20, and the machine frame 2.
It has a drive section 50 provided therein.

The film roll receiving section 10 includes a roll receiving device 1 that rotatably supports the film roll A.
1 is provided, and this roll receiving device 11
As shown in FIG.
A pair of supporting members 13, 13 fixed to each other by 2, 12 and protruding parallel to the rear, and both supporting members 1
Three roll receiving rollers 14...14 rotatably installed between 3 and 13, and both supporting members 1
A guide roller 15 and a brake member fixing shaft 16 are installed between 3 and 13, and a belt-shaped brake member 18 made of cloth or the like has one end fixed to the shaft 16 and a weight body 17 attached to the other end. It is made up of. The film roll A is rotatably placed on the roll receiving rollers 14 .
7 hangs backward, the braking force due to the weight of the weight body 17 acts on the upper peripheral surface of the roll A as frictional resistance with the brake member 18. Here, the two bolts 12, 12 that fix the pair of support members 13, 13 in the roll receiving device 11 to both sides of the machine frame 2, respectively, are formed vertically in the corresponding corners of the machine frame 2. However, another screw hole 2c is formed in the corner behind the upper screw hole 2a, and the two bolts 12, 12 are screwed into the screw hole 2a.
When screws a and 2c are screwed in, the entire roll receiving device 11 is set in an upwardly protruding state as shown by the chain line in FIG.

On the other hand, the folding portion 20 includes a center plate 22 disposed at the center of the upper front side of the machine frame 2;
A pair of side plates 2 placed on both sides of the
A folding device 21 consisting of 3 and 23 is provided. A center plate 22 in this folding device 21 is fixed to a support frame 24 installed laterally at the upper end of the machine frame 2 via a bracket 25 with its front surface facing the front. Further, as shown in FIG. 3, the pair of side plates 23, 23 are supported by the bracket 25 via a screw shaft 26 so that the distance between them can be adjusted, and the side plates 23, 23 are opened downward when viewed from the front and opened from the rear when viewed from the top. It is said to have a tilted posture,
Further, the front portions of both plates 23, 23 extend downward so as to intersect in front of the center plate 22. Of these extension parts 23', 23'', a triangular notch 23a' is provided in the lower part of the extension part 23' located on the front side, and a lateral slit 23a' is provided in the extension part 23'' on the back side. ” is provided,
The heater receiving portion 23 is located below the slit 23a''.

Then, as shown in FIG. 4, the center portion B' of the film sheet B pulled out from the roll A set on the rear roll receiving device 11 is bent downward by the upper edge 22a of the center plate 22, and at the same time, The left and right sides B″, B″ of the seat B are connected to the rear upper edge 23 of the pair of side plates 23, 23.
a, 23a, while bending downward and bringing it to the center, and also from both sides by the upper edges 23b', 23b" of the extensions 23', 23" of both side plates 23, 23. , B'' are turned upside down and their edges are overlapped. At this time,
The side B'' turned backward by the extension 23' on the front side (on the right in the drawing) is the back surface of the extension 23' and the front side of the extension 23'' on the back side (on the left in the drawing). The side B'', which passes through the gap and is turned backward by the rear extension 23'', comes out from the back of the extension 23'' to the front through the slit 23a'', and the side B'' passes through the slit 23
The edges of both sides B'' and B'' are overlapped on the front surface of the heater receiving part 23 below a''. Furthermore, when the film sheet B is folded into a cylindrical shape in this way, the edges of the side parts B'' and B'' are overlapped. A hollow portion C formed between the side portions B″, B″ and the center portion B′ opens upward.

Further, a center seal portion 3 provided in front of the heater receiving portion 23 in the folding portion 20
0, as shown in FIG. 2 and FIGS. 5 and 6, there is a center heater 31 for thermally welding the folded overlapping portions of the film sheet B, and a center heater 31 for thermally welding the overlapped portions of the film sheet B, and a center heater 31 for attaching the heater 31 to the film sheet B or the heater receiving portion 23. It is composed of a center heater drive device 32 that presses the center heater intermittently. The center heater drive device 32
is equipped with a heater support bracket 33 which is T-shaped in plan view and is attached to the mounting member 3 fixed to the machine frame 2 with bolts 4, 4.
A motor 34 is attached to one surface of the bracket 33, and the rotating shaft 34a of the motor 34 is inserted into the hole 3 of the bracket 33.
3a and protrudes to the other surface side. A disc 35 is attached to the rotating shaft 34a of the motor 34.
is fixed to the disc 35, and one end of a crank rod 36 is eccentrically connected to the disc 35, and the other end of the rod 36 is connected to a hole 33 of the bracket 33.
A slide member 3 is slidably held by fitting guide rods 37a and 37a into b and 33b.
7 are connected to each other, and the slide member 37, the crank rod 36, and the disc 35 constitute a crank mechanism. Further, a heater holder 39 is fixed to the slide member 37, which is reciprocated by the crank mechanism, via a connecting plate 38, and the center heater 31 is mounted on the holder 39. As a result, when the motor 34 rotates, the center heater 31 is
is moved back and forth, and the heater 31 is intermittently pressed against the overlapping portion of the film sheet B passing through the front surface of the heater receiving portion 23, as shown by chain lines in FIG. Also, the above bracket 3
3 is a roller support member 4 that pivotally supports a pair of rollers 40, 40 located above and below the center heater 31.
1 is supported so as to be movable back and forth through rods 41a, 41a inserted through holes 33c, 33c of the bracket 33, and rollers 40, 40 are moved by springs 42, 42 installed between the bracket 33 and the film sheet B. The overlapping portion is pressed against the heater receiving portion 23. Furthermore, a cam 43 is integrally formed on the disc 35 fixed to the rotating shaft 34a of the motor 34, and the cam 43
The bracket 33 is provided with a heater limit switch 44 that is turned on and off by rotation of the heater limit switch 44.
This switch 44 indirectly detects the longitudinal position of the center heater 31 from the rotation angle of the motor 34, and when the feeding of the film sheet B is stopped,
When the heater 31 separates from the film sheet B, the motor 34 is stopped.

On the other hand, the drive unit 50 is provided with a slide plate 52 that is slidably attached to guide shafts 51, 51 vertically installed on both left and right sides of the machine frame 2, as shown in FIGS. It is being As shown in FIG.
A crank arm 55 is fixed to one end of the drive shaft 54, and a lower end is connected to the arm 55.
A crank mechanism is constituted by a swing link 56 whose upper end is connected to the upper inner surface of the machine frame 2, and the drive shaft 54 or crank arm 55
Due to the rotation of the slide plate 52, the guide shaft 51,
It is designed to reciprocate up and down along the line 51. Here, the connecting point of the lower end of the swing link 56 with the crank arm 55 is movable along the arm 55, thereby adjusting the reciprocating stroke of the slide plate 52.

Further, as shown enlarged in FIGS. 7 and 8, a feeding device 59 consisting of parallel first and second clamping members 57 and 58 is provided on the front surface of the sliding plate 52. On the back is the drive shaft 5 mentioned above.
4, and first and second levers 64, 65 which are swung against springs 62, 63 by the rotation of the cams 60, 61 are disposed. By swinging the lever 64, the connecting member 66
and the first clamping member 57 via the rods 67, 67.
is moved back and forth, and the second clamping member 58 is moved back and forth via the rod 68 by the swinging of the second lever 65, so that both clamping members 57 and 58 are in the open state shown in solid lines in FIGS. It is designed to be opened and closed in the opposed state shown by the chain line. Here, the opening/closing operation of the clamping members 57, 58 and the reciprocating motion of the slide plate 52 are performed in synchronization, and when the clamping members 57, 58 descend from the top dead center to the bottom dead center in the reciprocating motion, the clamping members 57, 58
8 is closed, and the clamping members 57 and 58 are opened when moving from the bottom dead center to the top dead center. Further, a cutter 69 is attached to the surface of the first clamping member 57 that faces the second clamping member 58, and
The cutter 69 is provided on the opposing surface of the second clamping member 58.
Two cross heaters 70, 71 are placed at corresponding positions above and below.
are mounted in parallel. In this embodiment, the first clamping member 57 is connected to the support member 72 fixed to the rods 67, 67 by a plurality of bolts 73...7.
3 so as to be relatively movable back and forth, and is urged toward the second clamping member 58 by springs 73a...73a attached to the bolts 73...73. They are designed to interact elastically.

Furthermore, a product delivery conveyor 74 extending forward is provided at the lower front surface of the slide plate 52, as shown in FIGS. 1 and 2. This conveyor 74
, a pair of side frames 75, 75, a driven roller 76 and a driving roller 77 which are pivotally supported between the front and rear ends of both frames 75, 75, and both rollers 76, 7.
A plurality of rope belts 78...78 are wound between the rope belts 78...78
It is composed of. Then, the motor 5
3 rotates the drive roller 77 via the belt 79, so that each rope belt 78...78 runs in the X direction.
The brackets 80, 80 protrude from the drive roller 77, and are rotatably attached to the brackets 80, 80, which protrude from the drive roller 77. It is said that it can be set to Further, an auxiliary conveyor 81 in the vertical direction is provided at the upper front surface of the slide plate 52, and the drive shaft 54 drives the belt 82, the intermediate shaft 83, and the belt 8.
4. As a result, the roll receiving device 11 is set in the upwardly protruding position shown by the chain line in FIG.
If the packaging machine 1 is set in a position where it is stored inside
It can be used horizontally with the rear side facing downward.

In addition to the above configuration, as shown in FIG. 3, first and second limit switches 85 and 86 are provided on the back surface of the slide plate 52. These limit switches 85 and 86 are turned on and off by switch operating cams 87 and 88 provided on the drive shaft 54.
It is now set to operate OFF. That is, the first
The limit switch 85 is turned on when the slide plate 52 is at the top dead center or slightly past the top dead center to energize the cross heaters 70, 71 of the second clamping member 58 in the feeding device 59. Further, the second limit switch 86 is turned on while the slide plate 52 moves from the top dead center to the bottom dead center, and energizes the motor 34 of the center heater drive device 32 in the center seal portion 30, thereby driving the center heater 31. Move it back and forth. However, after the limit switch 86 is turned off, the motor 34 continues to rotate until the heater limit switch 44 in the center heater drive device 32 detects that the center heater 31 is separated from the film sheet B. The time when the cross heaters 70 and 71 are energized is determined by the first dial 8 provided on the front of the machine frame 2, as shown in FIG.
9, and the cross heaters 70, 71 are set by the second dial 90 provided below.
The energizing voltage is adjusted.

Next, the operation of the above embodiment will be explained.

First, as shown in FIG.
The film sheet B pulled out from the film roll A set in the machine is folded into a cylindrical shape along each plate 22, 23, 23 of the folding device 21 in the folding section 20, and then suspended from the front of the machine frame 2, and then fed. It is assumed that the packaging machine 1 is operated while being inserted between a pair of clamping members 57 and 58 that constitute the device 59 and are in an open state. At this time, first, the motor 53 in the drive unit 50 is activated and the crank arm 55 is rotated via the drive shaft 54, so that the slide plate 52 is moved by the action of the crank mechanism consisting of the arm 55 and the swing link 56. starts reciprocating (in this case, rising) up and down along the guide shafts 51, 51. At the same time, as the drive shaft 54 rotates, the first and second levers 64 and 65 swing under the action of the cams 60 and 61, and when the slide plate 52 reaches the top dead center, the pair of clamping members 5
7 and 58 are closed, and the film sheet B, which is folded into a cylindrical shape and is suspended between both members 57 and 58, is held between the members 57 and 58.

In this state, the clamping members 57 and 58 start descending together with the slide plate 52, and this descending action pulls out the film sheet B from the roll A, and during this time, the sheet B passes through the folding device 21. As a result, the film sheet B is folded into a cylindrical shape as shown in FIG. The overlapping portion is thermally welded by being pressed intermittently. Thereby, a cylindrical body D is formed from the sheet B. During this downward stroke, the hollow portion C of the cylindrical body D is filled with a loading chute 9 of a packaged material supplying device, which is manually or separately equipped as shown by the chain line in FIGS. 1 and 2.
1, a predetermined amount of the object to be packaged is thrown in, and the cross heaters 70 and 71 provided on the second clamping member 58 of the clamping members 57 and 58 clamping the cylindrical body D reach the top dead center. By energizing the tubular body D until the time set by the first dial 89, the bottom of the part of the cylindrical body D into which the article to be packaged is placed and the top of the part hanging downward are thermally welded. The hanging portion is cut off by a cutter 69.

When the slide plate 52 or the clamping members 57, 58 descend to the bottom dead center in this way, the clamping members 57, 58 move towards the cams 60, 61 and the lever 6.
4 and 65 to open and release the cylindrical body D. At this time, since the bottom of the cylindrical body D is sealed by the cross heater 70, the packaged object is It does not fall off and the separated lower part is released.

Next, the clamping members 57 and 58 start to rise together with the slide plate 52 in the open state, and clamp the cylindrical body D again at the top dead center as shown in FIG. 91. In this case, the clamping position for the cylindrical body D is higher than the previous clamping position by a distance corresponding to the reciprocating stroke L of the slide plate 52, and the object to be packaged that was put in during the previous descent is enclosed between both clamping positions. That will happen. Then, as shown in FIG. 9 2, the clamping member 5
7, 58 descend again together with the slide plate 52, the next article to be packaged is placed on the clamping members 57, 5 of the cylindrical body D.
8, and the cross heaters 70 and 71 seal the bottom of the part of the cylindrical body D into which the object to be packaged was placed this time and the top of the part into which the object to be packaged was placed last time. Then, both parts are cut by the cutter 69, and when the clamping members 57, 58 are opened at the bottom dead center, the lower part is released as a pack filled with the object to be packaged.

By repeating the same cycle,
Products, each consisting of a predetermined amount of packaged items packed into bags, are manufactured one after another and are sent forward by a carry-out conveyor 74. In this case, the longitudinal dimension of the cylindrical body D or the packaging bag can be arbitrarily adjusted by changing the position of the connecting point of the swing link 56 to the crank arm 55 in the drive section 50. Since the distance between the pair of side plates 23, 23 in the folding device 21 is adjustable, the widthwise dimension of the packaging bag can also be adjusted within a certain range in relation to the width of the film sheet B. ing.

However, in the center seal section 30 that thermally welds the overlapping portions of the film sheets B folded by the folding device 21, the pair of clamping members 57 and 58 constituting the feeding device 59 are folded into a cylindrical shape. Rotation of the motor 34 of the center heater drive device 32 is started by a signal from the second limit switch 86, which is turned on when the hanging film sheet B is clamped and fed downward. As a result, the rotation shaft 3 of the motor 34
Disc 35 and crank rod 36 fixed to 4a
The crank mechanism consisting of the slide member 37 and the connecting plate 38 and the heater holder 3 is operated.
By reciprocating the center heater 31 via the heater receiving portion 9, the heater 31 is intermittently pressed against the overlapping portion of the film sheet B passing in front of the heater receiving portion 23, and the overlapping portion is thermally welded. Then, a cylindrical body D is formed.

When the slide plate 52 reaches the bottom dead center and the holding members 57 and 58 release the film sheet B, the second limit switch 86 is turned off and the motor 34 in the center seal portion 30 is stopped. However, at this time, center heater 3
1 is pressed against the film sheet B, the film sheet B will melt. However, when the center heater 31 is pressing the film sheet B, the heater limit switch 44 detects this from the position of the cam 43.
It is in the ON state, and the rotation of the motor 34 is maintained by a signal from this switch 44, and when the center heater 31 separates from the film sheet B, the rotation of the motor 34 is stopped. This prevents the above-mentioned problem caused by stopping the feeding of the film sheet B while the center heater 31 is pressed against the film sheet B.

By the way, the feeding speed of the film sheet B sent by the feeding device 59 is slow when the feeding device 59 is near the top dead center and the bottom dead center, and becomes fast near the middle thereof. Therefore, when the center heater 31 is continuously pressed against the film sheet B, if the heating temperature of the heater is increased, the film sheet will melt when the feeding speed is slow, or if the heating temperature of the heater is lowered to prevent this, the feeding speed will be reduced. Poor welding occurs when the speed is high. However, as mentioned above, the center heater 31 is intermittently pressed against the film sheet B, and the time during which the center heater 31 and the film sheet B are in contact is approximately constant regardless of the feeding speed of the film sheet B. Therefore, if the heating temperature of the center heater 31 is set so that the film sheet can be thermally welded within this certain period of time, problems such as the film sheet melting or insufficient welding will be eliminated, and the process will always be reliable and reliable. This allows for good welding. Also,
When the film sheet is fed while the center heater 31 is being pressed, the melted part of the sheet is dragged and no longer scratches.
The finish of the welded area is improved.

Note that the cycle of pressing the center heater 31 against the film sheet B and the dimension l of the heater 31 in the sheet feeding direction (see Fig. 5) are such that even when the feeding speed is at its highest, there is a gap between the welded parts that are intermittently welded. They are set so that there are no gaps, that is, they are always welded with overlap.

(Effects of the invention) As described above, the present invention can be used in a bag-making and packaging machine that forms a packaging bag, inserts an item to be packaged into the bag, and seals the bag. By intermittently pressing the forming heater means against the overlapping portion, the pressing time of the heater means against the film sheet can be kept approximately constant regardless of the speed at which the film sheet is fed by the feed device driven via the crank mechanism. Therefore, when the heating temperature of the heater is increased, such as when feeding a film sheet while pressing the conventional center heater, the sheet may melt when the film sheet is fed slowly, or the heater is When the heating temperature is lowered, the problem of insufficient welding when the film sheet is fed quickly can be solved, and the timing of pressing the heater means is the timing at which overlap occurs in the overlapping part. Therefore, the occurrence of non-welded parts is eliminated, and the film sheet is always reliably welded. Furthermore, the heater means is driven when the heater means is separated from the film sheet after the sheet feeding device finishes feeding the sheet. Since the driving means for moving the film sheet is stopped, melting of the film sheet caused by stopping the feeding of the film sheet while the heater means is pressed is prevented, and the welded part is less The finish will be better.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
The figures are an overall front view, a side view, and a back view of the bag making and packaging machine, Fig. 4 is an enlarged perspective view of the folding device, Figs. 5 and 6 are an enlarged side view and plan view of the vicinity of the center heater, Fig. Figure 8 corresponds to Figure 3-line and line 2, respectively.
FIG. 9 is an enlarged longitudinal sectional side view and an enlarged lateral plan view of the vicinity of the feeding device taken along the line 1-2, and FIGS. 9 1 and 2 are schematic front views of main parts showing the operation. 1... Bag making and packaging machine, 11... Roll receiving device,
21... Folding device, 31... Heater means (center heater), 32... Drive means (center heater drive device), 34... Motor, 36... Crank rod, 44... Sensor (heater limit switch), 53... ... Motor, 55 ... Crank arm, 56 ... Swing link, 57, 58 ... Clamping member, 59 ... Feeding device, A ... Film roll, B ... Film sheet, D ... Cylindrical body.

Claims (1)

[Scope of utility model registration request] a roll receiving device for setting a film roll; a folding device for folding a film sheet pulled out from the film roll so that both side edges overlap in the center; a heater means for forming a cylindrical body by thermally welding parts; and a heater means for forming a cylindrical body by thermally welding the cylindrical body; A bag making and packaging machine comprising: a feeding device comprising a pair of clamping members for cutting the cylindrical body and sealing the cut end;
a driving means for intermittently pressing the heater means against the overlapping portion of the film sheet at a timing when an overlap occurs while the film sheet is being fed by the feeding device; and a heater means driven by the driving means. A sensor for detecting the position, and a control means for stopping the driving means when the sensor detects separation of the heater means from the overlapped portion of the film sheet after the feeding device stops feeding the film sheet. A bag making and packaging machine characterized by being equipped with.