JPH03243560A - Detecting unit for wrapping material amount pulled out from wrapping material take-up roll and confirming unit for wrapping material supply in packing machinery - Google Patents

Abstract

PURPOSE:To prevent the generation of incomplete wrapping by providing a roller contacted with a wrapping material and a pulled-out wrapping material amount detecting means to detect the rotation of the roller, so as to detect a specified amount of the pulled-out material and the supply of which to a packing section regardless of residual amount of the material. CONSTITUTION:A support unit C of a wrapping material take-up roll is constructed of a film winding roll 5, and a pair of rotating rollers 3, 4 on which the roll 5 is placed, and a pulled-out wrapping material amount detecting means 7, provided on one end of the rotating roller 3 to which a film 6 is rollably hung at the time of pulling-out. A pulled-out amount of the film 6 by means of the operation of a supply unit D for supplying the film 6 to a packing section can be detected by the detecting means 7 regardless of residual amount of the film on the winding roll 5, and a specified amount to be pulled out corresponding to the size of a tray can be also confirmed, therefore the generation of no or incomplete wrapping can be prevented previously.

Description

Detailed Description of the Invention Purpose of the Invention [Industrial Application Field] The present invention is directed to, for example, a packaging machine that wraps trays containing fresh foods, etc. with a stretch film. The present invention relates to a device for detecting film and a device for confirming the supply of film to a packaging section.

"Prior art" As a conventional packaging machine, for example, Japanese Patent Application Laid-Open No. 52-1329
There are those shown in Japanese Patent Application Laid-open No. 84 and Japanese Patent Application Laid-Open No. 58-90010. This packaging machine includes a film take-up roll support device, a film supply device that supplies the film pulled out from the film take-up roll to a packaging section, and a tray that is placed below the packaging section and moves up and down. , an article holder device that lifts the film by bringing the tray into contact with the film supplied to the packaging section; an article conveying device that supplies the tray onto the article holder of the article holder device; A film folding device that allows a rear folding member to approach and separate from the front folding member that has been folded, and also enables both left and right folding members to open and close as the rear folding member approaches and separates, thereby folding the film onto the lower side of the tray. This film folding device includes a front folding member of the film folding device, and an article carrying device, which is provided on the unloading side of the front folding member, and an article unloading device provided above the film folding device.

[Problem to be solved by the invention] In these packaging machines, it is difficult to determine whether or not a predetermined amount of film is actually pulled out from the film winding roll, and whether the pulled-out film is actually supplied to the packaging section by the film supply device. Since it is not possible to detect whether the film is folded or not, it is possible that folding, etc., may continue even though the predetermined amount of film has not been supplied to the packaging department. There was a risk that the packaging was not done or was incomplete.

The present invention provides a device that can detect the amount of film pulled out regardless of the increase or decrease of film on a film winding roll, and a device that confirms whether a predetermined amount of film is reliably supplied to the packaging section. The purpose is to

Structure of the Invention [Means for Solving the Problems] In view of this object, the film withdrawal amount detection device according to the present invention is configured such that the film is withdrawn as the package take-up roll 5 rotates, as shown in the drawings of the embodiment described later. The apparatus is equipped with a roller 3 that rotates in contact with a package 6, and a film withdrawal amount detecting means 7 that detects the rotation of the roller 3.

Moreover, the package supply confirmation device according to the present invention includes a device C that supports the package take-up roll 5, and a package supply device that supplies the package 6 pulled out from the package take-up roll 5 to the packaging section S. means 7 for detecting the amount of the package 6 pulled out from the package take-up roll 5 as the package supply device is driven; and a detection signal for the size W of the article 40. The memory means 10a stores in advance the amount of the package 6 to be pulled out from the package take-up roll 5 based on the detection signal from the package pull-out amount detection means 7, and the detection signal regarding the size W of the article 40. The storage means 10a
A drive control means 1 that compares the film drawer weight read out from the drive control means 1 and stops the packaging machine when they do not match.
0.

[Function] When the package take-up roll 5 rotates by the amount that the package 6 is pulled out, the roller 3 also rotates, and the package pull-out amount detecting means 7 detects the rotation.

Also, the amount of the package 6 actually pulled out and the tray 4
When the pull-out amount of the package 6 stored in advance according to the size W of 0 does not match, the packaging machine stops.

〔Example] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, in the film take-up roll support device C, rotating rollers 3, 4 are fitted to a pair of fixed shafts 1.2 arranged in parallel, and the inner rotating rollers 3, 4
A film winding roll 5 is placed on top. A film 6 pulled out from the film take-up roll 5 is wound around one rotating roller 3.

A photoelectric sensor 7 is provided at one end of one of the rotating rollers 3 as means for detecting the amount of film drawn out. This photoelectric sensor 7 consists of a toothed plate 8 that rotates integrally with the rotating roller 3, and a rotary encoder 9 that is turned on and off by the irregularities on the outer periphery of this toothed plate 8. This rotary encoder 9 is shown in FIG. It is connected to CPU10 as follows.

As shown in FIGS. 1 and 3.4, the film supply device includes a fixed gripping member 11 that grips the leading end of the film 6 pulled out from the film take-up roll 5, and a fixed gripping member 11 that It is provided with a movable gripping member 12 that approaches and moves away from the fixed gripping member 11 to grip the leading end of the film 6 .

The fixed gripping member 11 includes fixed gripping plates 13 that can be opened and closed with each other.
A movable gripping plate 14 and upper and lower gripping rollers 15.16 that can be opened and closed with each other are provided, and the leading end of the film 6 passes between the gripping rollers 15 and 16 to reach both gripping plates 13.1.
It is designed to be held between 4 and 4. The upper clamping roller 15 has six gripping plates 13 which are linked to a brake 17.
A cutting groove 18 is provided in the fixed gripping member 11 above the cutting groove 14 .

The movable gripping member 12 is supported on a rotation shaft 19 so as to be movable in the axial direction thereof. This movable gripping member 12 has a fixed gripping plate 20 and a movable gripping plate 21 that can be opened and closed, and a fixed gripping plate 21 located above them! There is also a knife 22 for cutting.

A solenoid 23 is attached below the fixed gripping member 11, and wires 24. 25 are connected. As the solenoid 23 is de-energized, the movable grip plate 21 moves the wire 24,
It is opened and closed via a rotation shaft 19 and a wire 25.

A rotary belt 26 is connected to the movable gripping member 12, and the rotary belt 26 is rotated by a drive motor 27. When the belt 26 rotates, the movable gripping member 12 approaches and moves away from the fixed gripping member 11.

As shown in FIG. 5, this drive motor 27 is linked with a rotary encoder 28 as movable gripping member position detection means, and this rotary encoder 28 is connected to CPU10 as shown in FIG. The position is detected and the detection signal is input to CPU10.

An article width detection sensor 29 is connected to the CPU10, and a detection signal regarding the width W of the tray 40 is input to the CPU10.

In addition to the control program, the program memory 10a contains the optimum film draw-out amount according to the width W of the tray 40, and the drive stop timing of the drive motor 27 that determines the stop position of the movable gripping member 12 so as to reach the optimum film draw-out amount. It is stored in advance.

Incidentally, as shown in FIGS. 1 and 6, a film folding device E is disposed above the film supply device. This film folding device E includes a front folding member 30 and a rear folding member 3.
1 and both left and right folding members 32. Further, as shown in FIGS. 1 and 6, a heater device F is disposed continuously 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 delivery device G on which a delivery belt 33 is passed.

Now, in the film supply device, FIG. 9(a)
When the movable gripping member 12 is separated from the fixed gripping member 11 and the film 6 is stretched between both gripping members 11 and 12 as shown in FIG. 11 upper and lower holding rollers 15.
16 opening, and is held between the fixed grip plate 13 and the movable grip plate 14 of the fixed grip member 11, and is held between the fixed grip plate 20 and the movable grip plate 21 of the movable grip member 12. There is. The upper clamping roller 15 is a brake 17
It is not possible to rotate due to the operation of.

Items in this state (things stored in the tray 40)
When the pedestal 34 on which the film is placed rises, the film 6 is moved between the upper and lower holding rollers 15 and 16 and between the fixed gripping plate 20 and the movable gripping plate 21 of the movable gripping member 12, as shown in FIG. 9(b). The film 6 is lifted to the packaging section S while being held down, and the film 6 stretches to cover the tray 40 from above.

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. If you put the tray 40 on the side by digging in to some extent,
The article pedestal 34 is lowered. Then, as shown in FIG. 9(c), the film 6 is placed under the rear folding member 31 of the tray 40.
And it is folded from both the rear and left and right directions by the left and right folding members 32. At the time of this folding, the grip of the film 6 by the movable gripping member 12 is released.

Thereafter, the movable gripping member 12 approaches the fixed gripping member 11. After folding by the rear folding member 31 and both left and right folding members 32, when the carry-out belt 33 of the article carry-out device G rotates, the tray 40 is carried out toward the front folding member 30, as shown in FIG. 9(d). It rests on the front folding member 30. The front folding member 30 bites into the film 6 below the tray 40, and in synchronization with the unloading of the tray 40, the movable gripping member 12
The knife 22 cuts the fixed gripping member 11! ! 7i? 111
8 , 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 . After this cutting, the brake 17 is released, the upper clamping roller 15 becomes rotatable, the clamping of the film 6 is released, and the movable gripping plate 2 of the movable gripping member 12
1 is closed and the tip of the film 6 on the fixed gripping member 11 is gripped by the movable gripping member 12.

Then, as shown in FIG. 9(e), the movable gripping member 12 is separated from the fixed gripping member 11. At this time, the CPU
Detection signals from the article and the width detection sensor 29 are input to CPU 0, and based on the detection signals, CPU 10 controls the drive motor 27.
The drive stop timing is read from the program memory 10a, and the drive motor 27 is stopped at the drive stop timing.

When the drive motor 27 stops, the movable gripping member 12 also stops, and the film 6 gripped by the movable gripping member 12 is pulled out from the film take-up roll 5, and as shown in FIG. 9(a), both gripping members 11. It is stretched between 12 spaces. The rear folding member 31 is spaced apart from the front folding member 30 and has both left and right folding members 32.
open to each other.

As shown in FIG. 9(b), when the tray 40 is placed on the central part of the starting end of the article transport conveyor 35 during this folding, the tray 40 is sent toward the article receiving table 34, and a stopper member protrudes above the conveyor 35. 36 and stops once. When the article holder 34 reaches the lowest position and the stopper member 36 is retracted below the conveyor 35, the tray 40 is sent again as shown in FIG. 9(C).
The conveyor 35 comes into contact with the stopper plate 37 and stops at the end of the conveyor 35. The tray 40 on the front folding member 30 is also folded in from the front and placed on the front folding member 30, where the heater is installed! The folded portion on the lower side of the tray 40 is brought into close contact with F.

When the article holder 34 is raised, the film 6 is packaged on the tray 40 in the same manner as described above.

In this way, in the packaging machine of this embodiment, the feeding of the tray 40 is carried out in the first cycle, the folding of the tray 40 is carried out in the second cycle, and the carrying out of the tray 40 is carried out in the third cycle. Exporting will proceed at the same time.

During this packaging process, the CPU 10 reads a predetermined film withdrawal amount from the program memory 10a based on the detection signal from the article width detection sensor 29, and compares it with the actual film withdrawal amount detected by the photoelectric sensor 7 as a film withdrawal amount detection means. When they are compared and they do not match, a signal is sent to the packaging machine operation stop selection means 38 to stop the packaging machine at the initial state of each cycle. When they match, the packaging machine continues to operate continuously.

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

Furthermore, when the actual amount of film 6 to be pulled out does not match the amount of film 6 to be pulled out that is stored in advance according to the width W of the tray 40, the packaging machine is stopped at the initial state of each cycle. As a result, there is no possibility that the film 6 will be unwrapped or incompletely wrapped in the tray 40 and carried out.

In the above-mentioned embodiment, the roller 3 rotating in direct contact with the film 6 is detected.
The present invention may also be applied to a packaging machine of the type disclosed in Japanese Patent Laid-Open No. 58-90010, for example.

Effects of the Invention According to the present invention, since the roller 3 that rotates in contact with the package 6 to be pulled out is used, the number of packages 6 is increased or decreased regardless of the number of packages 6 on the package take-up roll 5. The actual withdrawal amount can be detected.

Further, according to the present invention, since the packaging machine is stopped or continued to operate after checking whether or not the package 6 has actually been pulled out by a predetermined amount, the package 6 is not wrapped in the tray 40. There is no longer a risk that the product will be shipped out intact or incompletely packaged.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a film take-up roll support device, a film supply device, a film folding device, an article delivery device, and a heater device of a packaging machine according to this embodiment, and FIG. 2 is a longitudinal sectional view of the film take-up roll support device. 3 is a plan sectional view showing the film supply device; FIG. 4 is a plan sectional view showing the solenoid that opens and closes the grip plate of the movable gripping member; and FIG. 5 is the movable gripping member. 6 is a plan sectional view showing the film folding device, FIG. 7 is a partially cutaway plan view showing the article delivery device, FIG. 8 is an electrical block circuit diagram, and FIG. 9 is a partial plan view showing the position detection means. a) (b) (c) (d
) and (e) are explanatory views showing the packaging action, respectively. 3...Rotating roller, 5...Film winding roll, 6
. . . Film (packaging body), 7 . . . Photoelectric sensor as means for detecting film withdrawal amount, 10 . . . CPU (drive control hand H), 10a . . . Program memory (storage means)
, 11... fixed gripping member, 12... movable gripping member,
27... Drive motor, 28... Rotary encoder as movable gripping member position detection means, 29... Article width detection sensor, 40... Tray (article), S... Packaging section, C...・Film winding roll support device, D...
Film feeding device.

Claims (1)

[Claims] 1. A roller (3) that rotates in contact with the package (6) that is pulled out as the package take-up roll (5) rotates, and the rotation of the roller (3) is detected. Film withdrawal amount detection means (7
) A film withdrawal amount detection device characterized by comprising: 2. A device (C) that supports the package take-up roll (5); and a package supply device (C) that supplies the package (6) pulled out from the package take-up roll (5) to the packaging section (S). In a packaging machine equipped with D), the package take-up roll (
means (7) for detecting the amount (L) of the package (6) pulled out from the package take-up roll (5) based on a detection signal regarding the size (W) of the article (40); storage means (10a) for storing in advance the amount (L) of the film (6) to be pulled out;
40) The amount of film drawn out (L) read out from the storage means (10a) in response to the detection signal regarding the size (W).
) and a drive control means (10) for stopping the packaging machine when they do not match.