JPH05246592A - Film feeding device - Google Patents

Abstract

PURPOSE:To improve productivity through automation of a connecting work by fusing and connecting the starting end of a new film to the terminal end of an unwound film through detection of the terminal end thereof. CONSTITUTION:A film F1 unwound from a first film roll FR1 is guided to a feed roller 6 and positioned. Similarly, a film F2 unwound from a second film roll FR2 is guided to a position over a heating press 8 for connection and positioned. When the first film F1 is continuously fed and the terminal end thereof passes a film sensor 9, drive of the feed roller 6 is stopped by means of an output signal from the film sensor 9. The upper seal bar 82 of the heating press device 8 for connection is lowered, the films F1 and F2 are nipped and fused together between the upper seal bar and a lower seal bar 81 and the vicinity of the terminal end of the film F1 and the vicinity of the starting end of the film F2 are interconnected. Subsequently, the fused part between the films F1 and F2 is cut, a film ranging from a cut position to an end is removed, and drive of the feed roller 6 is restarted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film supply device.

[0002]

2. Description of the Related Art Conventionally, bags have been manufactured from plastic films such as polypropylene.
In this case, the film is wound around a core tube and formed into a roll shape, and the roll-shaped film is set, pulled out, and supplied to a bag manufacturing apparatus. Then, when the film wound in a roll shape disappears by sequentially pulling out the film, the end of the film and the start of a new film are connected.

[0003]

By the way, the connection of the old and new films is performed manually by a worker using a piece of tape or the like, which is not only complicated but also requires a lot of working time. However, the operation of the bag manufacturing apparatus has to be stopped during this time, which causes a problem of reduced productivity.

The present invention has been made in view of the above problems, and provides a film supply device capable of automatically connecting old and new films in a short time.

[0005]

According to a first aspect of the present invention, there is provided a film supply device, a pedestal for rotatably supporting a pair of film rolls, a feed roller for drawing out the film, and the pedestal and the feed roll. A hot press device for connection arranged between the roller and a film sensor for detecting the end of the drawn film. When the end of the first film is detected by the film sensor, the vicinity of the end of the film and the second film are detected. It is characterized in that the film and the vicinity of the start end of the film are fused and connected to each other via a hot pressing device for connection.

The film supply device according to the second aspect of the present invention includes a pedestal for rotatably supporting a pair of film rolls, a feed roller for drawing out the film,
A connection heating press device arranged between the pedestal and the feed roller, a film sensor for detecting the end of the drawn film, and an identification sensor for detecting characters and patterns printed on the film, When the end of the first film is detected by the film sensor, the vicinity of the end of the film and the vicinity of the start of the second film are fused through the connecting hot press device so that the reference characters and patterns overlap. It is characterized by connecting by.

[0007]

[Function] The film is pulled out from the film roll pivotally supported by the cradle via the feed roller. Then, when the end of the film is detected by the film sensor by sequentially pulling out the film, the vicinity of the end of the film and the vicinity of the beginning of a new film are fusion-spliced by the connection heating press device.

Further, when characters / designs are printed on the film, when the end of the film is detected by the film sensor, a new character is drawn out to the position where the reference characters / designs are printed. Corresponding to the letters and patterns on the film, the old and new films are similarly fused and spliced by the splicing press machine.

As a result, the old and new films can be connected automatically and in a short time. Then, even for a film on which characters / designs are printed, old / new films can be connected by matching the characters / designs.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire structure of a supply device 1. This supply device 1 rotatably rotates a pair of film rolls F _R , F _R formed by winding a film F around a core tube to form a roll. A pedestal 2 which is axially supported, a feed roller 6 which sandwiches and pulls out the film F fed from the pedestal 2 through the tension roller 3, the guide roller 4 and the length measuring roller 5 from above and below, and the pedestal 2 and the feed. It is composed of a cutting device 7 for the film F arranged between the roller 6 and the hot press device 8 for connection, and a film sensor 9 for detecting the presence or absence of the drawn film F.

The pedestal 2 has a rotary shaft 21 rotatably supported by bearings, and a brake device 2 for the rotary shaft 21.
Equipped with 2. The brake device 22 includes a brake lining drum 23 fixed to a rotating shaft, a belt brake 24 wound around the brake lining drum 23, and a spring 25 pulling the belt brake 24.
As described later, the rotation of the film roll F _R accompanying the pulling out of the film F by the feed roller 6 is braked. Therefore, when pulling out the film F, a constant tension acts on the film F, and the film F is always kept in a tension state.

A fixing metal fitting (not shown) can be fixed to the rotary shaft 21 via a set bolt, and as a result, the core tube of the film roll F _R inserted in the rotary shaft 21 is fixed from both sides by the fixing metal fittings. If the film roll F _R is sandwiched and the fixing member is fixed to the rotary shaft 21, the film roll F _R can be rotatably supported on the pedestal 2.

By the way, the cutting device 7 includes a cutter 71.
And a drive mechanism 72 such as a rodless cylinder that moves the cutter 71 in the left-right direction (direction orthogonal to the paper surface of FIG. 1). The cutting device 7 is arranged in a pair vertically so that the cutters 71 face each other. The new and old films F, F that have been pulled out as described later can be cut.

Although not shown in detail, the connection heating press device 8 has a lower seal bar 81 having a seal base in which heat lines are wired in the left-right direction, and a lower seal bar 81 facing the seal base of the lower seal bar 81. The upper and lower seal bars 82 are arranged and can be moved up and down by an air cylinder (not shown). By lowering the upper seal bar 82, two new and old films pass between the lower seal bar 81 and the upper seal bar 82. F and F can be fused and connected.

Further, near the downstream side of the tension roller 3, a film sensor 9 for detecting the presence or absence of the drawn film F is arranged. When the film F is drawn out and its end passes through the film sensor 9, The film sensor 9 outputs a signal.

On the other hand, an identification sensor 10 is arranged in the vicinity of the downstream side of the hot press device 8 for connection, and the identification sensor 10 has characters, patterns, symbols or the like printed on the film F in advance at regular intervals. (Hereinafter, referred to as characters / designs, etc.) can be detected. Further, the encoder 10 is provided so as to rotate in synchronization with the rotation of the length measuring roller 5, and the length of the drawn film F can be obtained by grasping the number of rotations of the encoder 10.

Next, the operation of the feeding device 1 will be described. First, the first film roll F _R1 and the second film roll F _R2 are rotatably supported on the receiving table 2.
Then, the film F ₁ fed from the first film roll F _R1 is wound around the tension roller 3 and the guide roller 4, and then is fed through the cutting device 7, the connection heating press device 8 and the length measuring roller 5. Guide up to 6 and position. Similarly, the film F _{2 fed} from the second film roll F _R2 is wound around the tension roller 3 and the guide roller 4 and then guided through the cutting device 7 to a position beyond the connection heating press 8 and positioned. To do.

If the feed roller 6 is driven in this state,
The feed roller 6 sandwiches and pulls out the film F ₁ , and supplies the film F toward a bag manufacturing apparatus (not shown). In this case, the brake device 22 is the fact that braking rotation of the first film roll F _R1 with the drawer of the film F _1, the film F ₁ is drawn under tension without loosening.

In this way, when the first film F ₁ is continuously supplied and its end passes through the film sensor 9, the driving of the feed roller 6 is stopped by the output signal from the film sensor 9. Then, the upper seal bar 82 of the connection heating press device 8 is lowered, and the lower seal bar 8
The first film F ₁ and the second film F ₂ are sandwiched between the first film F ₁ and the first film F ₂ and fused, and the vicinity of the end of the first film F ₁ and the vicinity of the start of the second film F ₂ are connected. Thereafter, the driving mechanism 72 of the cutting device 7 arranged below is operated to cut the vicinity of the fusion portion of the first film F ₁ and the second film F ₂ and terminate from the cutting position. Remove the film until. Next, when the upper seal bar 82 of the connection heating press device 8 is raised and then the driving of the feed roller 6 is restarted, the vicinity of the beginning of the second film F ₂ is connected to the vicinity of the end of the first film F _1. After that, the second film F ₂ is supplied toward the bag manufacturing apparatus.

After this, the core tube of the first film roll F _R1 left on the cradle 2 is removed and a new film roll F _R1 is set, and the film F ₁ is tensioned by the tension roller 3, the guide roller 4 and the cutting roller. It suffices to extend it to a position beyond the connection heating press device 8 through the device 7, position it, and make it stand by. That is, if the second film F ₂ currently supplied is exhausted, the film F ₁ pulled out from the newly set first film roll F _R1 and waiting is the second film F as a new film. Connected to ₂ .

By the way, characters and designs are printed on the bag, and when manufacturing such a bag, those characters and designs are printed for each required length of film per bag. The film F used is used. Therefore, when such a film is used, it is necessary to connect the old and new films in accordance with a repeating pattern such as characters and patterns.

In this case, when a plurality of characters / designs are printed within the length range of the film required to manufacture one bag, the identification sensor 10 sequentially prints the characters / designs. Since the detection is performed, it is unclear which character, pattern, or the like detected by the identification sensor 10 is used as a reference. For this reason, a reference character / design or the like is set, and positioning is performed with reference to the character / design or the like.
Then, the encoder 11 measures the length of the film F and detects the next reference character, pattern, or the like.

That is, as shown in FIG.
Since the characters, patterns, etc. printed on the screen are repeated every fixed length L, when the film F for that length is pulled out, the characters, patterns, etc. first detected by the identification sensor 10 are used as reference characters.・ It should be recognized as a design. Specifically, a length La that is slightly smaller than the repeating length L of the reference character or pattern is set, the encoder 11 detects that the film F is pulled out by the length La, and then the identification sensor The character / design detected first in 10 is recognized as a reference character / design, and other than that, the character / design detected in the identification sensor 10 is ignored. Then, when the reference character / design or the like is detected, the next reference character / design or the like is reset again to measure the length. At this time, a counter or the like can be used together to prepare for a case where characters, patterns, etc. deviate from the identification sensor 10.

In this way, when the characters and / or patterns to be the reference are sequentially detected, and the driving of the feed roll 6 is stopped by the film sensor 9 detecting the end of the film F, how much more can be drawn to obtain the reference. It is known from the difference from the current value of the encoder 11 whether or not the character / design to be reached is reached. Therefore, the feed roller 6 is driven by the length corresponding to the difference to pull out the film F. In this case, the starting end of the next film roll F _R is also preliminarily positioned on the basis of the reference characters / designs, and in this state, the first film F ₁ and the first film F ₁ are connected by the connection heating press device 8 as described above. if fusion sandwich the second film F _2, connecting the first near the end of the film F ₁ in a state where a character-pattern as a reference are overlapped, the second starting near the film F ₂ be able to. Then, by operating the cutting device 7, the unnecessary film left by the end of the first film F ₁ is cut and removed, the connection heating press device 8 is raised, and the drive of the feed roller 6 is restarted. Good.

In the present embodiment, the film left from the position near the fusion splicing portion of the previous film to the new film to the end thereof is cut and removed by a cutting device, and this portion is left as it is. The production of defective products is prevented as much as possible by supplying them to the bag manufacturing equipment, but the excess film is minimized by placing the film sensor close to the fusion splicing part. If so, the cutting device does not necessarily have to be provided.

Further, in the present embodiment, when a plurality of characters / designs are printed within the length of the film required for one bag, the characters / designs are identified by using the identification sensor and the encoder. I explained the connection of old and new films according to the above, but if one character or pattern is printed within the required length of the film per bag, this character It suffices if the identification sensor sequentially detects patterns and the like, and an encoder is not required.

[0028]

As described above, according to the present invention, when the end of the previous film is detected, the vicinity of the end of the film and the vicinity of the start of the second film are fusion-spliced. It is possible to connect automatically and in a short time, and it is possible to improve the productivity of film supply.

Even when characters and designs are printed on the film, the old and new films are automatically and quickly connected without spoiling the repeating pattern of characters and designs. Can be supplied.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a film supply apparatus of the present invention.

FIG. 2 is an explanatory diagram in a case of detecting a character, a pattern, etc. printed on a film.

[Explanation of symbols]

1 Supply Device 2 Cradle 6 Feed Roller 7 Cutting Device 8 Connection Heating Press Device 9 Film Sensor 10 Identification Sensor 11 Encoder F, F ₁ , F ₂ Film

Claims (2)

[Claims] 1. A pedestal that rotatably supports a pair of film rolls, a feed roller that draws out the film, a connection heating press device that is arranged between the pedestal and the feed roller, and a drawer. When the end of the first film is detected by the film sensor, the vicinity of the end of the film and the vicinity of the start of the second film are melted via the hot press device for connection. A film supply device characterized by wearing and connecting. 2. A pedestal that rotatably supports a pair of film rolls, a feed roller that draws out the film, a connection heating press device that is arranged between the pedestal and the feed roller, and a drawer. A film sensor for detecting the end of the film and an identification sensor for detecting characters, patterns, etc. printed on the film. When the end of the first film is detected by the film sensor, the vicinity of the end of the film and the second film are detected. A film supply device, characterized in that the vicinity of the start end of the film is fused and connected through a connection heating press device so that reference characters and patterns overlap.