JP2588521Y2 - Film tension device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic machine having a mechanism for supplying a film wound in a roll form.
The present invention relates to a structure of a film tension device for unwinding and storing the film for a predetermined length, and then supplying the film with a predetermined tension.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Laid-Open No. 2-25407 discloses an automatic device in which a bag made of polyethylene or the like is mounted inside an empty box for containing articles. This automatic device is provided with a device that applies a certain tension when a film as a material of the bag is supplied.

That is, as shown in FIG. 4, a film 3 wound from a film roll 1 by the rotation of a motor (not shown) is applied to a roller 5 and then returned to the tension bar 7 to be applied to a next roller 9. Through the first chuck 11 working one pair at both ends near the tip is gripped,
First chain 1 provided with first chuck 11
It moves with the movement of 3. Film 3 is a stack of two
It is cylindrical when opened. The moved film 3 is sealed by welding by the seal / cutting device 15 and cut at the same time to form one bag 17. The tip of the bag 17 is held by the first chuck 11 and is sucked and spread from both sides by a pair of suction pads 19. In the expanded state, the four corners of the edge of the expanded mouth are gripped by the second chuck 21 in which two pairs work in pairs.
The bag 17 is put on the box 25 by moving with the movement of the second chain 23 provided with the second chuck 21. Thereafter, air is blown into the box 25 from above the bag 17 by the air blower device 27, whereby the bag 17 is turned over and mounted on the inner surface of the box 25.

The tension bar 7 has a U-shape in a horizontal plane, and the film 3 is hung on one of a pair of opposite sides of the U-shape, and swings around the other. The film 3 is given a certain tension. The motor (not shown) for unwinding the film 3 performs an intermittent operation and stores the film 3 of a fixed length in the portion of the tension bar 7. As a result, the tension bar 7 moves downward, and the operation of the motor is stopped by the action of the proximity switch 29. When the stored film 3 is moved by the first chuck 11, the tension bar 7
Moves upward, and the motor operates again to unwind the film 3.

[0005]

However, the tension bar 7 of the prior art described above has a U-shape in a horizontal plane, and the side of the pair of U-shaped sides on which the film 3 is hung is in a cantilever state. It is easy to twist and the posture becomes oblique. When the film 3 is inclined, the tension applied to the film 3 is deviated in the width direction of the film 3, and in an extreme case, the supplied and moving film 3 may meander.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a film tension device in which the tension of a bar in contact with a film is not oblique and the tension is not deviated in a width direction. It is in.

[0007]

In order to achieve the above object, in the present invention, a film wound in a roll is unwound.
Fixed two to guide the film when feeding
Between the rollers, the weight of one tension bar
In a film tensioning device that stores the film by pulling the film downward in the vertical direction and applying a constant tension, a pinion gear provided at both ends of the tension bar and a pinion gear meshing with the pinion gear are provided substantially along the vertical direction. And a pair of parallel rack gears and tension bar
A cylindrical slurry provided at the end via a ball bearing
The pinion, pinion gear and pinion rack mesh
Contact the cylindrical slider parallel to the rack gear
And a slide guide.

[0008]

The bar for pulling the film moves vertically while the pinion gears at both ends are engaged with the rack gear. Since the rack gear is provided parallel to the film, the position of the bar does not become oblique to the film.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. The automatic device provided with the film tension device of the present embodiment is for mounting a thin bag of polyethylene or the like inside the empty box, as in the conventional example (FIG. 4). Is the same as

That is, as shown in FIG. 1, the film 3 is intermittently unwound from the roll 1 by a constant length by rotation of a motor (not shown). After the unwound film 3 is hung on the first roller 5, it is once returned to the bar 33 of the film tensioning device 31 according to the present embodiment, and hung.
After passing through the next roller 9, the vicinity of the tip is the first chuck
Is gripped. The first chucks 11 are provided on the first chain 13 and are provided at four locations at equal intervals.
This interval is set according to the size of the bag made of the film 3. The first chain 13 moves on a predetermined track by a sprocket 35.

When the vicinity of the leading end of the film 3 is moved to the center of the apparatus by the chuck 11 on the left side of the figure among the four sets of first chucks 11, the seal / cutting device 15 works to move the film 3 in the width direction by welding. At the same time,
Cut the back. Since the film 3 has a cylindrical shape with two thin polyethylene films, a bag is formed by the seal. At this time, the other first chucks 11 are close to the seal / cutting device 15, and a bag having a predetermined interval between the first chucks 11 is formed. Both sides near the tip of the bag are sucked by a pair of suction pads 19, and the mouth of the bag is expanded by the suction pads 19 being opened to each other. In the expanded state, the two pairs of the second chucks 21 are operated, and the opening of the bag is set to have a size that can be further covered with the expansion box 25. The two pairs of second chucks 21 clamp the four corners of the opened bag mouth and move with the movement of the second chain 23, so that the tip of the opened mouth of the bag is the box 25.
Cover. The second chain 23 moves on a predetermined track by a sprocket 37. At this time, the air blower device 27
As a result, air is blown downward from the top of the bag, that is, toward the inside of the box 25. Thereby, the bag is turned over, pushed into the inside of the box 25, and attached along the inner surface.

The box 25 in which the bag has been mounted in this way is
Is carried out by the conveyor 39, and the next box 25 is carried in. One first chain 13 and two second chains 23 are driven by a motor 55. That is,
The driving force of the motor 55 is transmitted to a pulley 59 provided coaxially on one of the sprockets 37 of the second chain 23 via a belt 57 or the like, and from another gear 61 provided on the sprocket 37, Other second chain 2
3 is transmitted to one gear 65 of the sprocket 37. The driving force is further transmitted from another gear 65 provided coaxially to the sprocket 37 via an idle gear 67 to a gear provided coaxially to one of the sprockets 35 driving the first chain 13. It is conveyed to 69.

As shown in FIGS. 2 and 3, the tension device 31 has a bar 33 supported by a pinion gear 41 and a rack gear 43 so as to be vertically movable. That is, the bar 33 has its own weight for applying a certain tension by pulling the film 3 guided between the two fixed rollers 5 and 9.
A pinion gear 41 is fixed to both ends of the bar 33, and a rack gear 43 that meshes with the pinion gear 41.
Are provided vertically with respect to the frame 45 of the apparatus. The rack gear 43 is provided in two pairs,
And are provided in parallel with each other. As shown in FIG. 3, a slide guide 47 for holding the pinion gear 41 meshed with the rack gear 43 is provided in a vertical direction, and cylindrical sliders 49 in contact with the slide guide 47 are provided at both ends of the bar 33. The ball bearing 51 is provided on the bar 33 with respect to the slider 49. A proximity switch 29 that responds when the bar 33 is lower than a predetermined height is provided below the gear frame provided with the rack gear 43. The proximity switch 29 is used for intermittently operating a motor (not shown) for rotating the roll 1 and unwinding the film 3 for a predetermined time.

The operation of the tension device 31 will be described below. The bar 33 always tries to be positioned downward by its own weight, and gives a certain tension to the film 3 which is gripped by the first chuck 11 and is to be moved upward. When the first chuck 11 moves the film 3 upward in synchronization with the movement of the first chain 13, the bar 33 is pulled upward by the constant tension, and moves while the pinion gear 41 and the rack gear 43 mesh with each other. . The engagement of the gears 41 and 45 eliminates the inertial force when the film 3 is moved by the first chuck 11, and supplies the film 3 in synchronization with the movement of the first chuck 11, that is, the first chain 13. Can be. The bar 11 moves sufficiently upward, and when the film 3 stored up to that point starts to be supplied upward, the proximity switch 2
9 operates and a motor (not shown) rotates the roll 1 to start unwinding the film 3. When the film 3 is sufficiently unwound and the movement of the first chuck 11 and the first chain 13 is stopped, the film 3 continuously unwound from the roll 1 weakens the tension, so that the bar 33 moves downward by its own weight. I do. When the position is sufficiently lower, the proximity switch 29
Works to stop the motor (not shown) and stop the rotation of the roll 1.

According to the above-described embodiment, the bar 33 is not formed in a U-shape in a horizontal plane as in the conventional tension bar 7 (FIG. 4). There is no slant. That is, always the bar 33
Keeps a state perpendicular to the rack gear 43, that is, does not become inclined with respect to the film 3, so that it is possible to prevent a bias in the distribution of the tension in the width direction. Further, since a space in the horizontal direction (see FIGS. 4 and 1) is not required as compared with the conventional tension bar 7, the apparatus becomes compact as a whole. Further, since the bar 33 moves while engaging with the pinion gear 41, the inertia force is eliminated,
It is possible to prevent the stored film 3 from moving at an accelerated speed due to the movement of the first chuck 11. That is, the film 3 can be supplied in synchronization with the movement of the first chuck 11, that is, the first chain 13. Further, since the movement of the pinion gear 41 at both ends of the bar 33 is the same, it is possible to prevent either of the two ends from moving earlier or later, and thus to prevent the bar 33 from tilting.

[0016]

As is apparent from the above description, in the film tensioning device according to the present invention, since the bar for pulling the film moves while the pinion gears provided at both ends are engaged with the rack gear, the posture becomes oblique. Therefore, it is possible to prevent the tension applied to the film from being biased in the width direction of the film.

[Brief description of the drawings]

Schematic side view of the entire automatic machine with a fill Mute Pensions apparatus according to an embodiment of the disclosed exemplary invention

FIG. 2 is a front view of the film tension device of FIG.

FIG. 3 is a horizontal sectional view of a main part of FIG. 2;

Figure 4 is a schematic side view of the entire automatic machine provided with a conventional fill Mute Pensions device

[Explanation of symbols]

1 roll 2 film 7 and 33 tension bar 11 first chuck 13 first chain 15 seal cutting device 19 suction pad 21 and the second chuck 25 boxes 27 air blower device 31 fill Mute Pensions device 35 and 37 the sprocket 41 the pinion gear 43 rack gear 47 Slide Guide

Claims (1)

(57) [Scope of request for utility model registration] An unrolled film is unwound.
Two fixed guides to guide the film when feeding
Between the rollers, due to the weight of one tension bar,
In a film tensioning device that stores a predetermined tension while pulling and storing the lum vertically downward, a pinion gear provided at both ends of a tension bar, and a pair of parallel gears meshed with the pinion gear and provided substantially along the vertical direction. Rack gear and tension bar
A cylindrical slurry provided at the end via a ball bearing
The pinion, pinion gear and pinion rack mesh
Contact the cylindrical slider parallel to the rack gear
A film tension device comprising: a slide guide;