JP2572469B2 - Film supply confirmation device in packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Industrial Application Field] The present invention relates to a film drawn from a film take-up roll in a packaging machine for packaging, for example, a tray containing perishables and the like with a stretch film. The present invention relates to a device for confirming the supply to the packaging unit.

[Prior Art] A conventional packaging machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-90010. This packaging machine has a film take-up roll support device, a film supply device that supplies a film drawn from the film take-up roll to a packaging portion, and a tray placed below the packaging portion to ascend and descend. ,
An article receiving device that lifts the film by bringing the tray into contact with the film supplied to the packaging unit, an article conveying device that supplies the tray onto the article receiving table of the article receiving device, and a position fixed in the packaging unit. A film folding device that allows the rear folding member to approach and separate from the front folding member, opens and closes both left and right folding members in accordance with the approach and separation of the rear folding member, and folds the film below the tray. The apparatus includes a heater device provided on the carry-out side of the film folding device and connected to the front folding member, and an article carrying device provided above the film folding device.

[Problems to be Solved by the Invention] In these wrapping machines, it is impossible to detect whether or not the film drawn from the film winding roll is actually supplied to the wrapping unit by the film supply device. Even though the paper was not supplied to the packaging section, it could happen that the fold was continuously made. In such a case, the packaging of the film on the tray may not be performed or may be incomplete.

An object of the present invention is to provide an apparatus for confirming whether or not a predetermined amount of film drawn from a film winding roll is reliably supplied to a packaging unit.

Configuration of the Invention [Means for Solving the Problems] In view of this object, a film supply confirmation device according to the present invention is provided to a device C supporting a film winding roll 5 and to be pulled out from the film winding roll 5 to a packaging unit S. And a film supply device D for supplying the film 6 that has been supplied.
In a wrapping machine that wraps and discharges the film by a plurality of cycle operations in which 40 is simultaneously advanced, the amount L of the film 6 pulled out from the film winding roll 5 with the driving of the film supply device D is brought into contact with the film 6 and rotated. Film withdrawal amount detecting means 7 for detecting based on the amount of rotation of rotating roller 3
A movable gripping member 12 capable of gripping the leading end of the film 6 pulled out from the film take-up roll 5 and moving along the method of pulling out the film 6, and a driving means for driving the movable gripping member 12
27, a movable gripping member movement amount detecting means 28 for detecting the amount of movement of the movable gripping member 12 in the film drawing direction, and an article 40
And the movable gripping member 12 by an amount of movement corresponding to the optimal film withdrawal amount L according to the size W of the movable gripper 12.
Storage means 10a for storing in advance the drive stop timing of the driving means 27 for moving the
The movement amount of the movable gripping member 12 detected by the above is compared with the drive stop timing of the drive unit 27 read from the storage unit 10a corresponding to the size W of the supplied article 40. The drive control means 10 for stopping the drive of the means 27, the withdrawal amount L of the film 6 detected by the film withdrawal amount detection means, and the optimum film read from the storage means 10a corresponding to the size W of the supplied article 40. The apparatus is provided with a packing machine operation stop selecting means 38 for comparing the withdrawal amount L and stopping the packing machine in the initial state of each cycle when the two do not match.

[Operation] That is, when the movable gripping member 12 gripping the film 6 moves in the film withdrawing direction by a moving amount corresponding to the size W of the supplied article 40, the driving unit 27 stops and the film withdrawing from the article 40 is stopped. finish. On the other hand, when the actual film withdrawal amount L detected by the film withdrawal amount detection means 7 matches the previously stored optimum film withdrawal amount L for the article 40, the packaging machine is stopped in the initial state of each cycle. .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, in the film take-up roll supporting device C, rotating rollers 3 and 4 are fitted to a pair of fixed shafts 1 and 2 arranged side by side. A film take-up roll 5 is placed on 4. The film 6 pulled out from the film take-up roll 5 has one rotating roller 3
It is wound around.

At one end of one of the rotating rollers 3, a photoelectric sensor 7 is provided as a film withdrawing amount detecting means. The photoelectric sensor 7 includes a tooth plate 8 that rotates integrally with the rotating roller 3.
And a rotary encoder 9 which is turned on and off by the concave and convex portions on the outer periphery of the tooth plate 8. The rotary encoder 9 is connected to the CPU 10 as shown in FIG.

As shown in FIG. 1 and FIGS. 3 and 4, the film supply device D includes a fixed gripping member 11 for gripping the leading end of the film 6 pulled out from the film winding roll 5, and And a movable gripping member 12 for gripping the leading end of the film 6 on the fixed gripping member 11 so as to approach and separate.

The fixed holding member 11 includes a fixed holding plate 13 and a movable holding plate 14 that can be opened and closed with each other, and upper and lower holding rollers that can be opened and closed with each other.
15 and 16 are provided, and the leading end of the film 6 passes between the two holding rollers 15 and 16 and is held between the two holding plates 13 and 14. The upper holding roller 15 is linked to the brake 17. A cutting groove 18 is provided in the fixed gripping member 11 above the holding plates 13 and 14.

The movable gripping member 12 is supported on the rotation shaft 19 so as to be movable in the axial direction. The movable gripping member 12 is provided with a fixed gripping plate 20 and a movable gripping plate 21 that can be opened and closed, and a knife 22 positioned above the fixed gripping plate 20 and the movable gripping plate 21.

Below the fixed holding member 11, a solenoid 23 is attached, and between the solenoid 23 and the rotating shaft 19, and between the rotating shaft 19 and the movable holding plate 21 of the movable holding member 12, wires 24, Two
5 are connected. The movable gripping plate 21 is
Is opened and closed via the wire 24, the rotating shaft 19 and the wire 25 in accordance with the de-energization of. A rotary belt 26 is connected to the movable holding member 12, and the rotary belt 26 is rotated by a drive motor 27 as a drive unit. When the belt 26 rotates, the movable holding member 12 approaches and separates from the fixed holding member 11.

As shown in FIG. 5, a rotary encoder 28 as a movable gripping member moving amount detecting means is interlocked with the drive motor 27, and the rotary encoder 28 is connected to the CPU 10 as shown in FIG. And the detection signal is input to the CPU 10.

The article width detection sensor 29 is connected to the CPU 10 and the tray 40
Is input to the CUP 10.

In the program memory 10a, in addition to the control program, the optimal film withdrawal amount L according to the width W of the tray 40 and the drive stop of the drive motor 27 that determines the stop position of the movable gripping member 12 so as to achieve the withdrawal amount L The timing is stored in advance.

As shown in FIGS. 1 and 6, a film folding device E is provided above the film supply device D. The film folding device E includes a front folding member 30, a rear folding member 31, and both left and right folding members 32. As shown in FIGS. 1 and 6, a heater device F is disposed in front of and in front of the front folding member 30 of the film folding device E. Further, as shown in FIGS. 1 and 7, above the film folding device E, there is provided an article unloading device G over which a unloading belt 33 is stretched.

Now, in the film supply device D, as shown in FIG. 9 (a), when the movable gripping member 12 is separated from the fixed gripping member 11 and the film 6 is stretched between the gripping members 11, 12, The film 6 pulled out from the film take-up roll 5 passes between the upper and lower holding rollers 15 and 16 of the fixed holding member 11, and is held between the fixed holding plate 13 and the movable holding plate 14 of the fixed holding member 11. At the same time, the movable holding member 12 is held between the fixed holding plate 20 and the movable holding plate 21. The upper holding roller 15 cannot rotate due to the operation of the brake 17.

Articles in this state (those with items stored in tray 40)
As shown in FIG. 9 (b), when the receiving table 34 on which the film is loaded rises, the film 6 is moved between the upper and lower holding rollers 15 and 16 and between the fixed holding plate 20 and the movable holding plate 21 of the movable holding member 12. The film 6 is stretched to cover the tray 40 from above by being lifted to the packaging section S while being pressed.

Next, when the rear folding member 31 approaches the front folding member 30, the left and right folding members 32 close each other, and the rear folding member 31 and the left and right folding members 32 bite into the film 6 below the tray 40. When the rear folding member 31 and the left and right folding members 32 bite into the lower side of the tray 40 to a certain extent and the tray 40 is placed, the article receiving table 34 descends. Then, as shown in FIG. 9 (c), the film 6 is folded under the tray 40 by the rear folding member 31 and the left and right folding members 32 from both the rear and left and right directions. At the time of this insertion,
The holding of the film 6 by the movable holding member 12 is released.

Thereafter, the movable holding member 12 approaches the fixed holding member 11. After the folding by the rear folding member 31 and the left and right folding members 32, the carry-out belt 33 of the article carrying-out device G is rotated, and the tray 40 is carried out toward the front folding member 30 as shown in FIG. It rests on the folding member 30. The front folding member 30 cuts into the film 6 below the tray 40. In synchronization with the unloading of the tray 40, the knife 22 of the movable gripping member 12 is inserted into the cutting groove 18 of the fixed gripping member 11, and the film 6 is pushed by the knife 22 and bites into the cutting groove 18, and the film 6 is cut by the knife 22. Is disconnected. After this cutting, the brake 17 is released and the upper holding roller 15 becomes rotatable, the holding of the film 6 is released, and the movable holding plate 21 of the movable holding member 12 is released.
Is closed, and the leading end of the film 6 on the fixed holding member 11 is held by the movable holding member 12.

Then, as shown in FIG. 9 (e), the movable holding member 12 is separated from the fixed holding member 11. At this time, a detection signal from the article width detection sensor 29 is already input to the CPU 10, and based on the detection signal, the CPU 10 reads the drive stop timing of the drive motor 27 from the program memory 10a, and controls the drive motor 27 at the drive stop timing. Stop. Drive motor
When the moving member 27 stops, the movable gripping member 12 also stops, and the film 6 gripped by the movable gripping member 12 or the film 6 is pulled out from the film take-up roll 5, and as shown in FIG.
It is stretched between 11,12. The rear folding member 31 is separated from the front folding member 30, and the left and right folding members 32 are opened from each other.

As shown in FIG. 9 (b), when the tray 40 is placed at the center of the starting end of the article transport conveyor 35 during the folding of the film 6, the tray 40 is sent toward the article receiving table 34, and the conveyor 35 is moved.
It comes into contact with the stopper member 36 protruding upward and temporarily stops.
When the article receiving tray 34 comes to the lowermost position and the stopper member 36 sinks below the conveyor 35 in synchronization with this, the tray 40 is fed again as shown in FIG. The conveyor 35 comes into contact and stops at the end of the conveyor 35. In the tray 40 on the front folding member 30, the film 6 is also folded from the front, and is placed on the front folding member 30, where the lower folded portion of the tray 40 is brought into close contact with the heater device F.

When the article receiving tray 34 is raised, the tray 40 is wrapped with the film 6 in the same manner as described above.

As described above, in the packaging machine of the present embodiment, the supply of the tray 40 is performed in the first cycle, and the film 6 below the tray 40 is supplied.
Is performed in the second cycle, and the unloading of the tray 40 is performed in the third cycle, and the supply, folding, and unloading proceed simultaneously.

During this packaging process, the CPU 10 reads a predetermined film withdrawal amount L from the program memory 10a based on the detection signal from the article width detection sensor 29, and detects the actual film withdrawal amount detected by the photoelectric sensor 7 as the film withdrawal amount detecting means. When they do not coincide with each other as compared with L, a signal is sent to the packing machine operation stop selecting means 38 to stop the packing machine in the initial state of each cycle. When they match, the continuous operation of the packaging machine is continued.

In particular, in this embodiment, when the film take-up roll 5 rotates by the amount L of film 6 pulled out, the rotating roller 3 around which the film 6 is wound also rotates by the amount L drawn out of the film 6 and the rotation of the roller 3 is stopped. Since the number of pulses is detected by the photoelectric sensor 7 as the film withdrawing amount detecting means, the actual withdrawal amount L of the film 6 can be detected regardless of the increase or decrease of the film 6 on the film winding roll 5.

Also, the film 6 withdrawal amount L actually withdrawn and the tray
The drawing amount L of the film 6 stored in advance according to the width W of 40
When the values do not match, the packaging machine is stopped in the initial state of each cycle.
There is no danger that 40 will be transported unpackaged or incompletely packaged.

Further, the film 6 is gripped at the distal end by the movable gripping member 12, and the movable gripping member 12 is actually pulled out from the film winding roll 5 by moving in the film pulling-out direction. Since the rotating roller 3 serving as a basis for detecting the film withdrawal amount L is actually rotated, the film withdrawal amount L is not detected unless the film 6 is actually withdrawn by the movable gripping member 12. In the case of a drawer failure, it is possible to eliminate the possibility of erroneously detecting that the drawer is normally drawn.

In the above-described embodiment, the detection is performed on the roller 3 that is in direct contact with the film 6 and rotates.

According to the present invention, the amount L of the film 6 is detected based on the amount of rotation of the rotating roller 3 rotating in contact with the film 6 to be unwound. Irrespective of the increase / decrease in the amount of the film 6, the actual amount L of the film 6 can be detected. Is stopped in the initial state of each cycle, so that the article 40 is not unpacked or incompletely packaged, and the movable gripping member
The rotation roller 3 is actually rotated based on the fact that the film 6 is actually pulled out from the film take-up roll 5 by means of 12, so that the possibility that the film drawn-out amount L is erroneously detected can be eliminated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a film take-up roll supporting device, a film supply device, a film folding device, an article unloading device and a heater device of a packaging machine according to the present embodiment, and FIG. FIG. 3 is a plan sectional view showing a film feeder, FIG. 4 is a plan sectional view showing a solenoid for opening and closing a holding plate of a movable holding member, and FIG. 5 is a movable holding member. FIG. 6 is a partial plan view showing the position detecting means, FIG.
FIG. 7 is a partially cutaway plan view showing the article discharge device, FIG. 8 is an electric block circuit diagram, and FIGS. 9 (a), (b), (c), and (d).
(E) is an explanatory view showing a packaging operation. 3 ... Rotating roller, 5 ... Film take-up roll, 6 ...
Film, 7: photoelectric sensor as film withdrawal amount detecting means, 10: CPU (drive control means), 10a: program memory (storage means), 11: fixed gripping member, 12:
Movable gripping member, 27 Drive motor (drive means), 28
Rotary encoder as movable gripping member moving amount detecting means, 29 ... article width detection sensor, 38 ... packing machine operation stop sorting means, 40 ... tray (article), S ... packaging unit, C ...
... Film take-up roll support device, D ... Film supply device.

Claims (1)

(57) [Claims] 1. A device (C) for supporting a film take-up roll (5) and a film supply device (D) for supplying a film (6) drawn from the film take-up roll (5) to a packaging section (S). And a packaging machine for packaging and carrying out the supplied article (40) by a plurality of simultaneous cycle operations, which is drawn out of the film take-up roll (5) with the driving of the film supply device (D). Film (6) withdrawal amount (L)
And a film withdrawing amount detecting means (7) for detecting the amount of rotation of the rotating roller (3) rotating in contact with the film (6) and a film (6) withdrawn from the film winding roll (5). A movable gripping member (12) capable of gripping the leading end and moving in the direction of drawing out the film (6); a driving means (27) for driving the movable gripping member (12); and a movable gripping member (12). A movable gripping member moving amount detecting means (28) for detecting a moving amount in the film drawing direction; an optimum film drawing amount (L) according to the size (W) of the article (40); and an optimum film drawing amount (L) Drive means (2) for moving the movable gripping member (12) by a movement amount corresponding to
Storage means (10) for storing the drive stop timing of (7) in advance
a), the moving amount of the movable gripping member (12) detected by the movable gripping member moving amount detecting means (28), and the storage means (10a) corresponding to the size (W) of the supplied article (40). From the drive stop timing of the driving means (27) read from
When the two coincide, the drive control means (10) for stopping the drive of the drive means (27), the withdrawal amount (L) of the film (6) detected by the film withdrawal amount detection means (7), and the supplied amount. A comparison is made between the optimum film withdrawal amount (L) read out from the storage means (10a) corresponding to the size (W) of the article (40), and when the two do not match, the packaging machine is operated in the initial state of each cycle. A film supply confirmation device for a packaging machine, comprising: a packaging machine operation stop sorting means (38) for stopping the operation.