JPS6222849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a packaging device for manually wrapping articles with a film.

(Prior Art) As this type of packaging device, one having the configuration shown in FIG. 11 is well known. In this Figure 11,
Reference numeral 81 denotes a main body, and the main body 81 has a film lead-out portion 82 at the front and rear intermediate portions.
2 has a base plate 83 for wrapping an article and a protrusion 84 for supporting fingers, and a cutter 85 is provided in the front of the film lead-out section 82. Reference numeral 86 denotes a film wrap supported by mounting rollers 87 and 88, and the film 89 pulled out from the wrap 86 is transferred to the lead-out portion 82.
It is guided out from the holder 90 and held in close contact with the holder 90.
The loading roller 87 or 88 is provided with a brake device (not shown) that exerts a rotational braking force thereon, so that when the film 89 is pulled out, a large amount of the film 89 is not pulled out at once. .

When the tray B containing the article A is wrapped with the film 89, as shown in FIG.
The film 89 is led out from the film lead-out part 82, and the film 89 is turned toward the base plate 83 to wrap the article A therein. The article A is then moved to the cutter 85 side as shown in FIG. 13, and cut by the cutter 85.

(Problem to be solved by the invention) By the way, in the conventional packaging device, the placing roller 87
Although it is equipped with a brake device that applies a braking force to the product, the film 89 can be pulled out at any time, so it is difficult to stretch the film 89 and tension-pack the article, and reliable packaging cannot necessarily be expected. At the same time, the amount of the film 89 to be pulled out depends on the operator's visual capacity and is not uniform. If the film is too small, the reliability of the packaging will be compromised.
There was a problem where I started drawing out 9 more than necessary, causing it to be wasted.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a packaging apparatus which can eliminate unevenness in the amount of film used for each article and can securely tension-wrap the articles.

[Structure of the Invention] (Means for Solving the Problems) The present invention has a mounting roller on which a wound film for packaging is placed, and the film is moved by rotation of the mounting roller based on a drawing operation. a detection device that detects the amount of film to be pulled out from the film feeding mechanism based on the rotation of the placement roller and outputs a detection signal when the amount reaches a set amount; A locking device locks the film feeding operation of the film feeding mechanism based on a detection signal from the detection device and then releases the lock.

(Function) When the film is fed by the drawer operation, the loading roller is rotated.

The amount by which the film is pulled out is detected by a detection device based on the rotation of the placement roller.

The film feeding operation is locked by a locking device based on a detection signal output from this detection device. The film can now be expanded. This locking device then releases the lock.

(Example) The following Figures 1 to 7 are for the first example of the present invention.
This will be explained with reference to the figures. First, in Figure 1, 1
is a base frame, and a cover plate 2 which also serves as a work plate is attached to the upper surface of the intermediate part thereof, and a base plate 3 for film winding work is attached to the cover plate 2 so that its movement in the front and back direction can be adjusted. It is being Furthermore, a protrusion 4 for supporting fingers and guiding the film is attached to the front edge of the lid plate 2. Further, a base plate 5 for use in bonding work is provided at the front of the base frame 1, and a panel plate portion 6 is formed in a rising shape at the rear end of the base plate 5. An adhesive hot plate 7 is attached to the upper surface of the base plate 6, and a heater (not shown) is disposed inside the adhesive hot plate 7. 8 is a lever, which is
It is located between the panel plate portion 6 of the base plate 5 and the protrusion 4 and is pivotably supported on the base frame 1 via a shaft 8a in the direction of arrow A and the direction opposite to arrow A. This lever 8 has a front rising portion 9 and a rear rising portion 10.
The front rising part 9 is formed with a front holding plate part 9a extending forward and a guard part 9b spaced apart from this, and the rear rising part 10 is formed with an L-shape whose tip part hangs down. A shaped rear holding plate portion 10a is formed to extend toward the front side. And the rear rising part 10
A sliding body 11 is attached to the holder. Reference numeral 12 denotes a return spring adjusted between the lever 8 and the base frame 1, and this is designed to constantly apply a rotational force to the lever 8 in the direction of arrow A. Reference numeral 13 denotes a pressure roller, which is attached to the tip of an arm 14 rotatably mounted on the substrate 1, and located in front of the front rising portion 9 of the lever 8. Reference numeral 14a denotes a return spring adjusted between the arm 14 and the base frame 1, which constantly applies a rotational return force to the arm 14 in the direction of arrow B.
15 is a heat cutter having a heater inside, and this is located between the front holding plate part 9a and the guard part 9b of the lever 8, and is fixedly disposed on the base frame 1.
Therefore, when the lever 8 is rotated in the direction opposite to the arrow A, the heat cutter 15 relatively protrudes further upward. Reference numeral 16 denotes a film supply mechanism, which is composed of a pair of film loading rollers 17 and 18 and a pull-out roller 19. Film loading rollers 17 and 18 are rotatably provided at the rear of the base frame 1 so as to face each other in the front and back.
0 windings 21 are placed thereon.
Further, the pull-out roller 19 is attached to the base frame 1 by the lever 8.
It is rotatably provided so as to face the sliding body 11 of. In this case, since the lever 8 is always urged to rotate in the direction of arrow A by the return spring 12, it is pressed against the pull-out roller 19 via the sliding member 11. As shown in FIG. 2, the film 20 is drawn out between the pull-out roller 19 and the slippery body 11. 22 is a detection device, which is constructed as follows. That is,
In FIG. 3, reference numeral 23 denotes a detection disk, which is attached to the mounting roller 17 so as to rotate together with it, and the detection disk 23 has ten detection holes 24 formed in a training arrangement. ing. Reference numeral 25 denotes a photoelectric proximity switch made of, for example, a photocoupler, which is provided opposite to the rotation locus of the detection hole 24 of the detection disk 23, and outputs a detection pulse as a detection signal in response to passage of one detection hole 24. It's starting to happen. In this case, the outer diameter d of the roller 17 is
It is set to 32 mm, therefore, one of the placing rollers 17
Approximately 100 mm of film 20 is removed per rotation, and 20 mm of film is removed per detection pulse.
This means that approximately 10 mm was derived. 26 is a locking device, which will be explained below. In FIG. 3, 27 is an annular body provided to rotate integrally with the mounting roller 17, and this annular body 27 has ten pawls 28 formed at equal positions around the circumference. 28 is located between each detection hole 24 of the detection disk 23. 29 is a lock lever,
The base end is rotatably pivoted to the base frame 1, and the distal end is formed with an engaging pawl 30 that engages with the pawl 28 when rotated in the direction of arrow C. . When the locking claw 30 engages with the claw 28, the rotation of the mounting roller 17 in the direction of arrow D is locked, and the operation of drawing out the film 20 is stopped. 31 is a solenoid, and its plunger 32 is connected to the tip of the lock lever 29. When the solenoid 31 is energized, the plunger 32 is moved upward from the solid line position in FIG. It is designed to be rotated in the direction of arrow D to perform the above-described locking by the engaging claw 30. In FIG. 2, 33 is a lever switch for releasing the primary lock, which is provided on the base frame 1 in correspondence with the lever 8.
When the lever 8 is rotated in the opposite direction of arrow A, its actuator 33a is pressed to perform a switch-on operation. Reference numeral 34 denotes an arm switch for releasing the secondary lock, which is provided on the base frame 1 in correspondence with the arm 14, and when the arm 14 is rotated in the opposite direction of arrow B, its actuator 34a is pressed. It is designed to perform a switch-on operation. In FIGS. 1 and 4, 35 is a setting device which is used to set the amount of film 20 to be drawn out, 36 is a first knob for setting the amount of primary removal, and 37 is a knob for setting the amount of secondary removal. 38 is a primary withdrawal amount display section, and 39 is a secondary withdrawal amount display section. On the other hand, in FIG. 5, reference numeral 40 indicates a control circuit comprising a microcomputer, and reference numeral 41 indicates a solenoid drive circuit, the functions of which will be explained in the following explanation. In addition, in FIG. 1, 42 is a power switch;
43 is a temperature setting device for the adhesive hot plate 7, and 44 is a temperature setting device for the heat cutter 15.

Now, the operation of the above configuration will be explained.

(I) First, turn on the power switch 42. Then, the first knob 36 of the setting device 35 is operated to set the primary pull-out amount of the film 20 to, for example, 120 mm, and the second knob 37 is operated to set the secondary pull-out amount of the film 20 to, for example, 100 mm. ”. With this setting operation, the setting signals S ₃₅ a, S ₃₅ b
is applied to the control circuit 40 and sequentially stored in its first storage section and second storage section.

() Next, pull out the film 20 as shown in FIG. 6a. With this, the pull-out roller 19 and the placing roller 1
7 and 18 are rotated and sequentially led out from the wound material 21, and then placed on the detection device 2 by the placing roller 17.
The second detection disk 23 is rotated. In this case, since the film 20 slides on the sliding body 11, the lever 8 is not rotated at all. Each time the detection hole 24 of the rotating detection disk 23 passes through the proximity switch 25, the proximity switch 25 detects this and sends a detection pulse P ₂₅ to the control circuit 40.
When the count value matches the set value "120 mm" stored in the first storage unit, that is, the pulse count value "12", the control circuit 40 outputs the drive signal. _S40a
is outputted and applied to the solenoid drive circuit 41, and this drive circuit 41 energizes the solenoid 31. As a result, the lock lever 29 is rotated in the direction of arrow C, and its engaging pawl 30 engages with one of the pawls 28. As a result, the rotation of the mounting roller 17, that is, the film feeding operation of the film feeding mechanism 16 is stopped. Locked. Note that this is called a primary lock. This primary lock stops the supply of film 20.

() In this primary lock state, the pull-out portion of the film 20 is placed on the base plate 3 as shown in Fig. 6b.
and the film 20 is placed on the tray 46 containing the article 45 at the base 3.
Turn it to the bottom of the Further, the tray 46 is moved in the direction of arrow E, and the film 20 is applied to the article 44 in an expanded state. In this case, since the loading roller 17 is primarily locked, the film 20 is sufficiently stretched without being unnecessarily drawn out, and the article 45 and the tray 46 are reliably wound with the film 20 in a taut state.

() Next, the tray 46 in the above state is shown in Fig. 6c.
It moves forward, that is, in the direction of the thermal cutter 15, as shown in FIG. As a result, the film 20 comes into contact with the upper end of the rear rising portion 10 of the lever 8, thereby causing the lever 8 to rotate in the opposite direction of arrow A. As a result, the lever switch 33 is turned on to supply the primary lock release signal _S33 to the control circuit 40, and the control circuit 40 synchronizes with the rise of the primary lock release signal _S33 from OFF to ON. drive signal S ₄₀ a to the solenoid drive circuit 41
As a result, the solenoid 31 is cut off and the lock lever 29 is pulled back, disengaging and releasing the primary lock. This unlocking allows the film 20 to be pulled out. When the primary lock release signal _S33 is input to the control circuit 40, the detection pulse _P25 from the proximity switch 25 is switched to be applied to the second counter circuit of the control circuit 40.

(V) Then, move the tray 46 further forward and pull out the film 20. With this, detection disk 2
Detection pulse of proximity switch 25 as 3 rotates
P ₂₅ is applied to the second counter circuit of the control circuit 40 and counted, and the detection pulse P ₂₅
is the setting value “100mm” stored in the second storage unit.
That is, when the pulse count value "10" matches, the control circuit 40 outputs the drive signal S ₄₀ b and applies it to the solenoid drive circuit 41. As a result, the solenoid drive circuit 41 energizes the solenoid 31, the lock lever 29 is rotated in the direction of arrow C, and the engagement pawl 30 engages with the pawl 28. As a result,
The rotation of the mounting roller 17 is locked. This is called a secondary lock. This secondary lock stops the supply of the film 20, so that the film 20 has been pulled out approximately 100 mm.

() In this secondary lock state, the tray 46
While moving and urging the film 20 in the direction of the arrow F shown in FIG. 6d, the film 20 is stretched.
is wrapped at the lower surface of the tray 46, and the wrapped portion is pressed against the pressure roller 13. in this case,
The lever 8 is in a rotated position in the opposite direction of arrow A, so that the heat cutter 15 relatively protrudes above the lever 8, so that the film 20 is exposed to the heat as shown in FIG. 6e. It is cut by the cutter 15.

() By pulling the tray 46 forward while pressing it against the pressure roller 13, the temporary adhesion of the wrap portion of the film 20 on the lower surface of the tray 46 is ensured. In this case, tray 46
When pressed by the pressure roller 13, the arm 14
is rotated in the opposite direction of arrow B, thereby turning on the arm switch 34 and supplying the secondary lock release signal _S34 to the control circuit 40.
The control circuit 40 stops outputting the drive signal S ₄₀ b to the solenoid drive circuit 41 in synchronization with the rise of the lock release signal S ₃₄ from OFF to ON, and as a result, the solenoid 31 is cut off and the lock lever 29 is turned off. It is pulled back and the secondary lock is released. Thereafter, as shown in FIG. 7, the tabs 20a of the film 20 protruding from the left and right sides of the tray 46 are pulled in the direction of arrow G, and the film 20 is inserted into the lower surface of the tray 46, and then the lower surface of the tray 46 is bonded to the hot plate 7. The film 20 on the lower surface of the tray 46 is welded by pressing the tray 46, thus completing the packaging of the article 45.

In addition, when packaging the following items, the above operations from () to () are performed in order.

By the way, with conventional packaging devices, as mentioned above, it is difficult to stretch the film 20 and tension-wrap the article, and reliable packaging cannot always be expected. Therefore, the wrap width of the film 20 on the lower surface of the tray 46 may be too large or too small;
If the film 20 is too small, there is a problem in that the reliability of the packaging is impaired, and normally the film 20 is drawn out more than necessary, resulting in wasted consumption.

On the other hand, according to this embodiment, the following effects are achieved.

(A) Since the lock device 26 normally allows the film 20 to be pulled out and locks the film 20 to be pulled out at a predetermined time, the film 20 can be fully extended by the lock;
In this way, the article 45 can be wrapped under tension, and packaging can be ensured.

(B) Furthermore, a detection device 22 for detecting the amount of the film 20 to be pulled out is provided, and a lock device 26 is operated to lock based on the detection pulse _P25 of this detection device 22, so that the amount of the film 20 to be pulled out can be determined. Therefore, it is possible to eliminate excess/deficiency of the film 20 on each article, that is, unevenness, making it possible to perform packaging more reliably.
It is possible to reduce the usage of 0. According to the results of an experimental investigation conducted by the present inventor, the amount of film savings was as follows. That is, the tray 46 is
In the case of a top surface length of 92 mm, a height of 16 mm, and a bottom surface length of 70 mm, an average of 288.6 mm of film was required for each tray 46 in the past, whereas this device requires an average of 202.0 mm of film per tray 46. The amount of film used was only 1 mm, and the film length was reduced by 30%. Furthermore, since the film 20 can be stretched sufficiently in the front and back directions, the film 20 does not need to be stretched so much in the lateral direction, and as a result, the width of the film 20 can be made smaller (reduced by about 80%) than in the conventional case. Overall, the overall amount of film used was reduced by approximately 41.2%.

(C) Since the detection device 26 is configured to detect the amount of film pulled out based on the rotation of the existing mounting roller 17,
Even if the outer diameter of the film 20 changes, the amount of the film 20 to be pulled out can be accurately detected.Moreover, there is no need to provide a new member that rotates in relation to the drawing out of the film 20, and an increase in the number of parts can be eliminated. .

(D) Since the locking device 26 is configured to lock the rotation of the film loading roller 17 of the film supply mechanism 16, the wound object 21 of the film 20
can reliably prevent over-rotation due to inertia. As a result, it is possible to eliminate the need for a brake device provided in a conventional packaging device, thereby reducing the labor required to pull out the film 20.
Fatigue can be significantly reduced. That is, in conventional packaging devices, a brake device always applies a braking force to the loading roller to prevent the film from over-rotating. This has to be done against braking force, requiring labor to pull out the film, and when a large number of products are packaged, the problem is that the degree of fatigue increases. This embodiment was able to solve this problem as described above. According to the experimental investigation conducted by the present inventor, conventionally 1000~
The film pulling force of 1100g was required, but in this example, the film pulling force was only about 350g, that is, the labor was reduced to approximately 34%.

(E) Also, since the lock device 26 is configured to perform a primary lock after the primary drawer and a secondary lock after the secondary drawer, the film 20 on the base plate 3 is
Both the wrapping and the wrapping of the film 20 on the base plate 7 can be performed while the film 20 is being stretched, and the entire surface can be securely wrapped under tension.

In the above embodiment, the photoelectric proximity switch 25
However, a magnetic proximity switch may be used instead.

Next, FIGS. 8 and 9 show a second embodiment of the present invention, in which the detection device of the first embodiment is used to detect the length of the film 20 pulled out.
This embodiment differs from the first embodiment in that a detection device 47 different from that of Embodiment 2 is provided. The detection device 47 includes a pinion (gear) 49 connected to the mounting roller 17 via an electromagnetic clutch 48, and a rack 50 (moving body) provided on the support base 50a so as to mesh with the pinion (gear) 49.
and a detection switch 51 consisting of a limit switch provided on the base frame 1 near the rack 50.
, a pusher 52 that is movably provided on the rack 50, and a spring 53 that constantly moves the rack 50 in the direction of arrow H. The distance l determines the pull-out length of the film 20. That is, when the loading roller 17 rotates as the film 20 is pulled out, the pinion 49 is rotated, so that the rack 50 is moved in the direction opposite to the arrow H.
direction, and when the rack 50 is moved by a distance l, the detection switch 51 is activated by the pusher 52.
is pressed to generate a detection pulse, and based on this detection pulse, the electromagnetic clutch 48 is engaged and released, and the locking device 26 is actuated to close the mounting roller 17.
locks the rotation. After this, the rack 50 is returned to its original position by the spring 53. In this embodiment, the amount of film drawn out at the time of primary locking and secondary locking is the same, but two pairs of detection switches 51 and pushers 52 are provided for detecting the amount of primary drawing out and the amount of film pulling out secondary, respectively. If so, the first withdrawal amount and the second withdrawal amount can be set as appropriate.

FIG. 10 shows a third embodiment of the present invention, and this figure shows a detection device 54 that differs from the detection device 47 of the third embodiment in the following points. That is, in the second embodiment, the pinion 49 is
The support stand 50a of the rack 50 is directly connected to the shaft 50b.
The rack 50 is rotatably supported at , and the rack 50 can be separated from the pinion 49 by rotating in the direction of the arrow I. At all times, the support base 50a is urged to rotate in the opposite direction of arrow I by the spring 55 to maintain the connected state, and the detection switch 51
When the detection pulse is generated, the support base 50a is moved by the solenoid 57, which is activated based on this, in the direction of the arrow I.
The rack 50 is separated from the pinion 49 by rotating in the direction shown in FIG. Therefore, in this third embodiment, the solenoid 57 is operated instead of the electromagnetic clutch 48 to return the rack 50 to its original position in the direction of arrow H.

In each of the above embodiments, the annular body 2 having the claw 28 is
Although the lock device 26 is shown as an example in which the lock lever 29 is engaged with the lock lever 29, a well-known electromagnetic brake, a pneumatic brake, a hydraulic brake, or the like may be used as the lock device. Further, a touch switch may be used as the primary lock release means and the secondary lock release means.

Note that the present invention is not limited to the above embodiments, and may be modified, for example, as follows. That is, the lock device 26 may be configured to lock the rotation of the loading roller 18 or the rotation of the pull-out roller 19. Further, either or both of the primary lock and the secondary lock can be released using a timer.

In addition, the present invention can be implemented with various modifications within the scope of the gist.

[Effects of the Invention] As is clear from the above description, the present invention can eliminate unevenness in the amount of film used for individual articles, can reliably and tightly package the articles, and can reduce the amount of film used by this tension packaging. It is possible to provide a packaging device that can greatly reduce the number of parts, can accurately detect the amount of film to be pulled out, and can eliminate an increase in the number of parts.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention,
Figure 1 is an overall perspective view, Figure 2 is an enlarged longitudinal side view, and Figure 3 is an enlarged longitudinal side view of the locking device.
Fig. 4 is an enlarged front view of the setting device, Fig. 5 is a block diagram, Figs. FIG. 8 and 9 are a side view and a plan view, respectively, of a detection device showing a second embodiment of the present invention, and FIG. 10 is a view corresponding to FIG. 8 showing a third embodiment of the present invention. And, Figures 11 to 13
The figures show a conventional example, with FIG. 11 being an overall longitudinal sectional side view, and FIGS. 12 and 13 being enlarged longitudinal sectional side views of essential parts for explaining the packaging procedure. In the figure, 1 is a base frame, 7 is an adhesive hot plate, 8 is a lever,
13 is a pressure roller, 14 is an arm, 15 is a thermal cutter, 16 is a film supply mechanism, 1
7 and 18 are loading rollers, 19 is a pull-out roller,
20 is a film, 22 is a detection device, 25 is a proximity switch, 26 is a lock device, 28 is a claw, 29 is a lock lever, 31 is a solenoid, 33 is a lever switch, 34 is an arm switch, 4 is a control circuit,
41 is a solenoid drive circuit, 47 and 54 are detection devices, 49 is a pinion (gear), and 50 is a rack (moving body).

Claims (1)

[Scope of Claims] 1. A film supply mechanism that has a mounting roller on which a wrapping film for packaging is placed and supplies the film as the mounting roller rotates based on a pull-out operation; a detection device that detects the amount of film to be pulled out from the feeding mechanism based on the rotation of the placement roller and outputs a detection signal when the amount reaches a set amount; and a locking device for locking and then releasing the locking operation of the film. 2. Claim 1, characterized in that the detection device is comprised of a detection disk that rotates according to the amount of film that is pulled out, and a proximity switch that generates a detection signal based on the rotation of this detection disk. The packaging device described in . 3. A patent claim characterized in that the detection device is composed of a gear that rotates in accordance with the amount of film that is pulled out, a moving body that meshes with the gear, and a detection switch that generates a detection signal based on the movement of the moving body. The packaging device according to scope 1. 4. The packaging apparatus according to claim 1, wherein the lock device is configured to lock the rotation of a film loading roller included in the film supply mechanism. 5. The packaging device according to claim 1, wherein the film supply device includes a lever that is rotated by the film to project the cutter when the film is pulled out toward the cutter. 6. The packaging device according to claim 5, wherein the locking device is unlocked by rotating a lever. 7. The packaging device according to claim 1, wherein the lock device performs a primary lock after a primary drawer and a secondary lock after a secondary drawer. 8 Claim 7, characterized in that the primary withdrawal amount and the secondary withdrawal amount are set to be different.
Packaging equipment as described in Section. 9. Claims characterized in that the primary lock is released by rotating a lever that is rotated by the film to project the cutter, and the secondary lock is released by rotating an arm provided with a pressure roller. Packaging device according to paragraph 7.