JPH0114100B2 - - Google Patents

Description

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

(Prior art) Conventionally, this type of packaging apparatus has been used to place a film cylinder on a placing roller, pull out the film and thread it around the bottom of the article to be packaged, and then pull out the film again to remove the film. The article to be packaged is wound with a cutter, and the film is cut with a cutter, and then the film is thermally welded with a hot adhesive plate. As can be seen from the above, the film drawing operation includes a primary film drawing operation for passing the film around the bottom of the packaged article, and then wrapping the packaged article further with a film and cutting the film with a cutter. There is a secondary film drawer operation for this purpose.

(Problems to be Solved by the Invention) By the way, in conventional packaging devices, a brake is always applied to the placement roller in order to stretch the film and tension-pack the article. Although this brake applies a braking force to the loading roller, it is necessary to allow the film to be pulled out, and therefore, it is necessary to forcefully pull the film during the above-mentioned primary and secondary film drawer operations. Even if you try to tension-wrap the film, this cannot be done satisfactorily, and the amount of primary and secondary withdrawal of the film depends on the visual capacity of the operator.
All of them are not uniform, so the wrap width of the bottom film may be too large or too small for the packaged item, and if it is too large, the film will be wasted.
Furthermore, if the size is too small, there is a problem in that the reliability of the packaging is impaired, and there is usually a problem in that the film is pulled out more than necessary, resulting in wasted consumption.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a packaging device that can eliminate unevenness in the amount of film used for each article to be packaged and can securely tension-wrap the article.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a primary film drawer operation for passing a packaging film to the bottom of an article to be packaged;
After the article to be packaged is further wrapped in a film and a secondary film drawing operation is performed to cut the film with a cutter, the film is thermally welded with an adhesive hot plate. When a cylinder is placed and a film is pulled out, a loading roller rotates according to the length of the pulled-out film, and a loading roller is provided to interlock with the loading roller via an electromagnetic clutch. a movable body that is moved in one direction from a predetermined position in conjunction with the rotation of the mounting roller when the clutch is connected; a spring for returning the movable body to the predetermined position when the clutch is released; a first stopper; The first solenoid has a second stopper, a first solenoid for moving the first stopper, and a second solenoid for moving the second stopper. The stopper prevents movement of the moving body to lock the primary film drawer, and the second stopper prevents movement of the moving body when the film is pulled out by a predetermined secondary drawer amount. a locking mechanism for locking the secondary film drawer;
The first solenoid is driven in response to the switch operations of the lock release switch, the second lock release switch, and the first lock release switch to release the primary drawer lock caused by the first stopper and the The electromagnetic clutch is opened to allow the movable body to return to the predetermined position, and the second solenoid is driven in response to the switch operation of the second lock release switch to lock the secondary drawer by the second stopper. and a control circuit that releases the electromagnetic clutch and opens the electromagnetic clutch to allow the movable body to return to the predetermined position.

(Function) When the film is pulled out, the placement roller rotates. This rotation causes the movable body to move from a predetermined position toward the position against the spring force of the spring when the electromagnetic clutch is engaged. When the movable body is pulled out by a predetermined primary withdrawal amount, the first stopper of the locking mechanism prevents the movable body from moving. As a result, the amount of film drawn out during the primary drawing operation is made constant, and since the primary film drawer is locked, the film can be fully extended. When the first lock release switch is operated, the first solenoid is driven by the control circuit to release the primary drawer lock by the first stopper and open the electromagnetic clutch. As a result, the movable body returns to the predetermined position (original position) due to the spring force. Thereafter, when the movable body is pulled out by a predetermined secondary withdrawal amount, the second stopper of the lock mechanism prevents the movable body from moving. As a result, during the secondary drawer operation, the amount of drawer is made constant, and the secondary drawer of the film is locked, so that the film can be stretched sufficiently. and the second
When the lock release switch is operated, the second solenoid is driven by the control circuit to release the secondary drawer lock by the second stopper and open the electromagnetic clutch. As a result, the movable body returns to the predetermined position (original position) due to the spring force. As can be seen from the above,
Since the film is locked when it is pulled out by a predetermined primary draw-out amount and a predetermined secondary draw-out amount, the film draw-out amount is always constant;
Since the second stopper forcibly locks the film from being pulled out, the film can be strongly pulled out and the film can be fully stretched.

(Example) An example of the present invention will be described below with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a base frame, and a lid plate 2 which also serves as a work plate is attached to the upper surface of the intermediate part of the base frame. Adjustably installed for movement. Furthermore, a protrusion 4 for supporting fingers and guiding a film is attached to the front edge of the lid plate 2. Further, a base plate 5 for bonding work is provided at the front of the base frame 1, and a panel plate portion 6 is formed in an upright shape at the rear end of the base plate 5. An adhesive hot plate 7 is adsorbed on the upper surface of the base plate 5, and a heater (not shown) is disposed within the adhesive hot plate 7. Reference numeral 8 denotes a lever, which is located between the panel plate portion 6 of the base plate 5 and the protrusion 4, and is attached to the base frame 1 by a shaft 8.
It is pivotally supported to be rotatable in the direction of arrow A and the direction opposite to arrow A via a. This lever 8 also has a front rising portion 9 and a rear rising portion 10 facing each other,
The front rising portion 9 is formed with a front holding plate portion 9a extending forward and a guard portion 9b spaced apart from the front holding plate portion 9a, and the rear rising portion 10 is provided with an L-shaped rear holding plate portion 10a having a hanging tip portion on the front side. It is formed to extend to. A sliding body 11 is attached to the rear rising portion 10. Reference numeral 12 denotes a return spring stretched between the lever 8 and the base frame 1, and this is designed to constantly apply a rotation biasing 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 pivotably mounted on the base frame 1, and is located in front of the front rising portion 9 of the lever 8. Reference numeral 14a denotes a return spring stretched 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 attached to the front holding plate portion 9a of the lever 8.
The base frame 1 is fixedly positioned between the guard portion 9b and the guard portion 9b.
Therefore, when the lever 8 is rotated in the direction opposite to the arrow A, the heat cutter 15 projects relatively above these. Reference numeral 16 denotes a film supply mechanism, which is composed of a pair of loading rollers 17 and 18 and a pull-out roller 19. The mounting 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.
A film cylinder 21 wrapped with 0 is placed thereon. Further, a pull-out roller 19 is rotatably provided on the base frame 1 so as to face the sliding body 11 of the lever 8. In this case, since the lever 8 is always urged to rotate in the direction of arrow A by the return spring 12, the sliding body 11
It is in a pressed state via. As shown in FIG.
1. Here, the outer diameter d of the mounting roller 17 is set to 32 mm, and therefore, the film 20 is pulled out by 10 mm per rotation of the mounting roller 17. 22 is a chain mechanism, which, as shown in FIGS. 3 and 4, includes a main sprocket 24 connected to the placement roller 17 via a constantly connected electromagnetic clutch 23, and a chain mechanism connected to the main sprocket 24 in front of the main sprocket 24. A slave sprocket 25 pivotally mounted on the part, and both sprockets 2
4 and 25, and the chain 26 is always urged to move in the direction of arrow C by a spring 27. Now, in FIG. 3, reference numeral 28 denotes a moving member formed of, for example, a rectangular metal body, which is attached to the chain 26 of the chain mechanism 22, and this moving member 28 is attached to a stopper 29 provided on the base frame 1. Therefore, it is held at a predetermined position (the position indicated by the solid line in FIG. 3). When the electromagnetic clutch 23 is engaged, the moving member 28 is moved in one direction from a predetermined position in conjunction with the rotation of the mounting roller 17, and when the electromagnetic clutch 23 is disengaged, the moving member 28 is moved in one direction from a predetermined position. Spring 27 returns chain 26 to the specified position. 30 is a lock mechanism, which is constructed as follows. That is, 31 is a first solenoid, which is configured to constantly push up the plunger 31a and lower the plunger 31a when energized. It is attached to the groove 32a of the elongated support 32 so as to be movable in the direction of arrow Q and the direction opposite to arrow Q. Also 33 is this first
The first stopper is attached to the upper end of the plunger 31a of the solenoid 31, and this is the first stopper attached to the upper end of the plunger 31a of the solenoid 31.
The stopper body 34 has a stopper body 34, and a protruding piece 36 provided on the stopper body 34, which is always biased to move upwardly by a spring 35. 37 is the second
This solenoid is configured to lower the plunger 37a downward at all times and raise the plunger 37a when energized.The second solenoid 37 is located on the support 32 behind the first solenoid 31. arrow Q direction and counter arrow Q
It is installed so that it can be moved in any direction. Therefore, the plunger 37 of this second solenoid 37
A second stopper 38 is attached to the upper end portion of a, and since the second stopper 38 has the same structure as the first stopper 33, the first stopper 33
The same parts are given the same reference numerals and the explanation will be omitted.
The first stopper 33 and the second stopper 38 prevent the moving member 8 from moving, and therefore the position of the moving member 28 shown in solid line in FIG. The distances l ₁ and l ₂ from the stopper 38 determine the amount of withdrawal of the film 20, and in this connection the distances l 1 and l 2 from the support 3
2 is a scale 3 that displays the amount of the film 20 to be pulled out.
2b is attached. And in Figure 2,
Reference numeral 39 denotes a lever switch which is a first lock release switch, and this is provided on the base frame 1 in correspondence with the lever 8, and when the lever 8 is rotated in the opposite direction of arrow A, its actuator 39a is activated. It is designed to perform a switch-on operation when pressed. Further, in FIG. 1, reference numeral 40 denotes an arm switch serving as a second lock release switch, 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. At this time, the actuator 40a is pressed to perform a switch-on operation. On the other hand, in FIG. 5, 41 is a control circuit consisting of a microcomputer, 42 is a first solenoid drive circuit, 43 is a second solenoid drive circuit, and 44 is a clutch drive circuit, which will be explained in the following operation explanation. reveal. In Fig. 1, 45 is a power switch;
46 is a temperature setting device for the adhesive hot plate 7, and 47 is a temperature setting device for the heat cutter 15.

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

() First, in order to set the primary pull-out amount of the film 20 to 120 mm, for example,
1 to the ``120 mm'' position on the scale 32a of the support body 32, and also adjust the position of the second solenoid 37 to the ``100 mm'' position on the scale 32a to set the secondary withdrawal amount to ``100 mm.'' Then, the power switch 45 is turned on.

() 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, and the film 20 is sequentially taken out from the film barrel 21. Then, as the mounting roller 17 rotates in the direction of arrow D in FIG.
are rotated in the same direction. With this, chain 26
is moved in the opposite direction of arrow C, and the moving member 28 is accordingly moved in the direction of the first stopper 33. Then, when the loading roller 17 rotates 1.2 times, that is, when the film 20 is pulled out by 120 mm, the movable member 28 moves a distance l ₁ and encounters the first stopper 33, and the stopper 33 stops the movable member 28 from moving. is prevented, and the rotation of the mounting roller 17 is locked (see the two-dot chain line in FIG. 3). still,
This is called the primary drawer lock. This primary drawer lock stops the supply of film 20. As a result, the amount of film 20 pulled out is always constant during this temporary drawing operation.

() In this primary drawer lock state, the pulled out portion of the film 20 is guided toward the base plate 3 as shown in FIG. 6b, and the film 20 is
is passed through the base plate 3 to the bottom of the tray 49 containing the article 48. Furthermore, tray 49
(the article to be packaged) is moved in the direction of arrow E,
With the film 20 stretched, the tray 49
be coated on. In this case, since the first stopper 33 forcibly locks the film 20 from being drawn out, the film 20 is not drawn out unnecessarily and is sufficiently stretched, and the article 48 and the tray 49 are held in tension. 20, the winding is ensured.

() Next, the tray 49 in the above state is shown in Figure 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 rotating the lever 8 in the opposite direction of arrow A. As a result, the lever switch 39 is turned on to supply the primary drawer lock release signal S39 to the control circuit ₄₁ , and the control circuit 41 responds to the rise of the primary drawer lock release signal _S39 from OFF to ON. synchronously outputs a drive signal _S41a to the first solenoid drive circuit 42 for a short time,
A clutch drive signal S ₄₁ b is supplied to the clutch drive circuit 44.
output for a short time. As a result, the first solenoid 31 is energized to lower the plunger 31a and therefore the first stopper 33 for a short time, and as a result, the movable member 28 is temporarily freed and the primary drawer lock is released. At the same time, the electromagnetic clutch 23 is energized by the clutch drive circuit 44 and kept in the open state for only a short period of time, allowing the moving member 28 to return, and the spring 27 causes the chain 26 and therefore the moving member 28 to return to their original positions. Moved back to position. Further, based on the primary drawer lock release signal _S39 , the control circuit 41 outputs a drive signal _S41c to the second solenoid drive circuit 43 to energize and drive the second solenoid 37 to drive the plunger 37a and hence the second stopper. 38 (see Figure 7). By releasing the primary drawer lock mentioned above, the film 20
withdrawals are allowed.

() After this, the tray 49 is further moved forward and the film 20 is pulled out. In this case, when the mounting roller 17 makes one rotation, that is, when the film 20 is pulled out by 100 mm, the movable member 28 moves a distance l ₂ and encounters the second stopper 38, and the stopper 38 stops the movement of the movable member 28. As a result, the rotation of the mounting roller 17 is locked (see the two-dot chain line in FIG. 7). This is called a secondary drawer lock. As a result, the amount of secondary withdrawal of the film 20 remains constant during the secondary withdrawal operation of the subsidiary.

() In this secondary drawer locked state, the tray 49 is further moved and biased in the direction of the arrow F shown in FIG. is pressed against the pressure roller 13. In this case as well, the film 20 can be stretched sufficiently, and at this time, the lever 8 is in a rotated position opposite to the direction of the arrow A, so that the heat cutter 15 is relatively above the lever 8. Therefore, the film 20 is cut by the thermal cutter 15 as shown in FIG. 6e.

() By pulling the tray 49 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 49 is ensured. In this case, tray 49
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 40 and supplying the secondary drawer lock release signal _S40 to the control circuit 41, and the control circuit 41 receives the secondary drawer lock release signal S40. In synchronization with the rise of _{signal 40} from OFF to ON, the output of the drive signal S ₄₁ c to the second solenoid drive circuit 43 is stopped, and the clutch drive signal S ₄₁ b to the clutch drive circuit 44 is output for a short time. In this case, the second solenoid 3
7 is cut off, the plunger 37a and the second stopper 38 are lowered to free the movable member 28, and the secondary drawer lock is released. At the same time, the electromagnetic clutch 23 is energized for a short period of time to be released, so that the movable member 28 is moved by the spring 2.
It is moved back to the original position by the spring force of 7 (3rd
(See solid line in the figure). Thereafter, as shown in FIG.
0a in the direction of arrow G and put it around the lower surface of the tray 49, and then press the lower surface of the tray 49 against the adhesive hot plate 7 to weld the film 20 on the lower surface of the tray 49, and thus the article 48
Finish wrapping.

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

〔Effect of the invention〕

As is clear from the above description, the present invention is capable of reliably locking the drawer when the film is pulled out by a predetermined amount during the primary film drawer operation, and also enables the film to be reliably locked by the predetermined amount during the secondary film drawer operation. This drawer can be reliably locked when the film is pulled out, and therefore, the amount of film drawn out can be regulated to a predetermined amount during the primary drawer operation and the secondary drawer operation, and the film can be sufficiently stretched. As a result, it is possible to eliminate unevenness in the amount of film used for each item to be packaged, and the items can be wrapped securely and under tension, and this tension packaging can greatly reduce the amount of film used, achieving excellent effects. be able to.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an overall perspective view, FIG. 2 is an enlarged longitudinal sectional side view, FIGS. 3 and 4 are an enlarged longitudinal sectional side view and a plan view of the locking mechanism part, and FIG. Figure 5 is a block diagram, Figures 6a to 6e are enlarged longitudinal side views for explaining the packaging procedure, Figure 7 is an enlarged longitudinal side view of the locking mechanism part for explaining the operation, and Figure 8 is an enlarged longitudinal side view of the locking mechanism during the packaging procedure. FIG. 2 is a perspective view of the article in one state. 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 chain mechanism, 23 is an electromagnetic clutch, 27 is a spring, 28 is a moving member, 30
is a lock mechanism, 31 is a first solenoid, 33 is a first stopper, 37 is a second solenoid, 38
is the second stopper, 39 is the lever switch (first
40 is an arm switch (second lock release switch), and 41 is a control circuit.

Claims (1)

[Claims] 1. A primary film drawer operation for passing the packaging film around the bottom of the packaged article, and a secondary film drawer operation for further wrapping the packaged article with film and cutting the film with a cutter. After that, the film is thermally welded using an adhesive hot plate, and when the film cylinder is placed and the film is pulled out, a placing roller rotates according to the length of the pulled out film. a moving body that is provided to interlock with the placement roller via an electromagnetic clutch and is moved in one direction from a predetermined position in conjunction with the rotation of the placement roller when the electromagnetic clutch is engaged; a spring for returning the clutch to the predetermined position when the clutch is released; a first stopper and a second stopper; a first solenoid for moving the first stopper; and a first solenoid for moving the second stopper. A second solenoid is provided, and when the film is pulled out by a predetermined primary draw-out amount, the first stopper prevents movement of the moving body to lock the primary draw-out of the film, and the film is pulled out by a predetermined secondary pull-out amount. a locking mechanism for locking the secondary film drawer by preventing movement of the movable body by the second stopper when the film is pulled out by the amount of the film; a first lock release switch; and a second lock release switch. The first solenoid is driven in response to the switch operations of the lock release switch and the first lock release switch.
The primary drawer lock by the stopper is released, and the electromagnetic clutch is released to allow the movable body to return to the predetermined position, and the second solenoid is driven in response to the switch operation of the second lock release switch. a control circuit for releasing the secondary drawer lock by the second stopper and releasing the electromagnetic clutch to allow the movable body to return to the predetermined position.