JPH11180410A - Method and apparatus for keeping upper surface of bag flat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed positively bags kept herein one by one to a cramper by holding flatly the upper surface of bags to be stacked in a bag housing frame. SOLUTION: The bag housing frame 10 is formed of both side plates 11, a front plate 12, and a rear surface plate 13, in which a seat plate 14 is set to mount a number of stacked bags for package, and both the sides of the seat plate 14 are formed into cut parts 21 at the bag mouth side in the bag so as to make the seat plate width shorter than the seat width, and further a leaf springs 23 are stuck in the shortened parts. In general, a plastic bag tends to be thick due to its elastic property at both sides and thus both the sides of the bag becomes bulky; however, the bag corner is hung down by the cut parts 21 and supported by a reaction strength of the springs. As a result, if the numbers of bags vary, the upper surface of the bag can be held almost flat, and thereby removal of the bag by a vacuum cap is implemented without making errors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for loading a plastic packaging bag in a bag housing frame of an automatic bagging and packaging machine so that the upper surface thereof is always flat.

[0002]

2. Description of the Related Art JP-A-01-124521 discloses that
While providing a large number of clamps at equal intervals on the periphery of the disc,
The rotary bag-filling and packaging machine, which moves each clamp on a circular orbit by rotating the disk, catches empty bags with each clamp during the movement, and sequentially fills each empty bag with an object to be packaged, comprises:
Since 30 or more bags are consumed per minute, this type of packaging machine stores a large number of bags stacked in a bag storage frame and supplies the stored bags to the clamper one by one. Configuration.

[0003]

As shown in FIG. 5, a bag 2 formed by cutting a plastic tube to a predetermined length and welding one end 1 thereof has a fold 3 on both sides due to its elasticity. When bags of this type are stacked in the above-mentioned bag storage frame without flattening, the bags are inevitably bulky on both sides as in the state of the bag in the upper region, and the bag 2a is warped on the upper surface and has a length and width direction. Causes misalignment. Such a displacement causes a problem that, when the bag sucked by the vacuum cup 4 is supplied to the packaging machine, the bag naturally does not face a prescribed area of the packaging machine. As can be understood from FIG. 4 often misses the warped bag 2a.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method of maintaining the upper surfaces of bags stacked in a bag housing frame flat by mounting each of the bags on a seat plate in the bag housing frame. On the side where the vacuum cup acts, the width of the seat plate is reduced from the bag width, and the corner of the bag protruding from the seat plate to the reduced portion is loaded on the elastic body protruding from the seat plate to the reduced portion, The weight of the bag corner is supported by an elastic biasing force acting upwardly of the elastic body.

[0005] Further, as an apparatus for the same purpose, a large number of bags are arranged in a stack on a seat plate inside a bag housing frame having an open top surface, and an end of the bag is suctioned by a vacuum cup to suck the bag housing frame. Means for taking out one by one from the bag, the bag protruding permitting means formed by reducing the width of the seat plate at least on the side on which the vacuum cup acts, and a bag protruding from the seat plate to the reduced portion. In order to support the corner portion from below, an elastic body is provided which protrudes from the seat plate to the reduced portion and has an elastic biasing force in an upward direction.

[0006]

The weight of the corner of the mounted bag is applied to the elastic body protruding from the seat plate at the reduced portion of the seat plate. When the number of bags is small and the weight of the bag corner is small, the amount of flexure or compression of the elastic body is small, and therefore, the upper surface of the bag is almost flat. However, when the number of bags increases and the corner weight increases, the elastic body is pushed down greatly, and at the same time, the reaction force of the elastic body against the corner weight also increases. Therefore, if an appropriate reaction force design of the elastic body is performed in advance based on the relationship between all these forces, even if the number of bags is increased, if the number of bags is within a certain range, the upper surface of the bag is always almost flat due to the reaction force of the elastic body. Can be kept.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a bag housing frame 10 comprises a pair of vertical side plates 11, a front plate 12, and a rear plate 1 respectively.
3 and a horizontal seat plate 14 is provided inside.

[0008] As shown in FIG.
In this case, the side plate 11 prevents the lateral displacement of the bag 15, and the front plate 12 and the rear plate 13 also accommodate the bag in the storage box 10.

As shown in FIG. 2, a bar 17 is vertically slidably penetrated through a bottom plate 16 connecting both side plates 11, and the seat plate 14 is fixed to an upper end of the bar. . The upper surface of the bag 15 is always kept at the same height by the rotation of the pinion 20 meshing with the rack teeth 19, corresponding to the action of the vacuum cup 18 moving in the vertical direction to remove the bags 15 one by one.

Conventionally, there is an existing one in which the vacuum cup 18 in FIG. 2 is greatly expanded and contracted in the vertical direction against the elasticity of the coil spring. Even if it is lowered, the vacuum cup 18 having a vertically elastic cushion can remove the bag at the bottom of the box. Therefore, the seat plate 1 to which the present invention is applied
6 does not always move up and down.

In FIG. 2, the vacuum cup 18 sucks the end of the bag 15 near the front of the bag housing box and takes out the bag. As shown in FIG. 1, both sides of the front side of the seat plate 14 are cut off diagonally. , Forming a bag protruding means. In other words, the width of the seat plate 14 is made smaller than the bag width on the side on which the vacuum cup acts by the notch 21, the corner of the bag is protruded from the reduced width, and the corner is bent downward by the weight of the bag itself. On the other hand, a pair of leaf spring elastic members 23 fixed to the seat plate 14 with screws 22 protrude laterally at the cutout portions 21 to support the weight of the bag corner.

As other examples of the elastic body, sponge rubber utilizing a cushioning property of a fluid, or a material in which a fluid is sealed in a cylinder or a rubber container can be applied.

FIG. 3 shows an embodiment in which the overall width of the seat plate 14 is smaller than the width of the bag 15, and the elastic body 23 supports the bag corner on the side where the vacuum cup acts.

FIG. 4 shows a support plate 26 provided on the side edge of the seat plate 14 via pins 25 so as to be rotatable up and down.
This is a different embodiment in which a coil spring 28 is provided between the bracket and a bracket 27 which hangs from the lower surface of the seat plate. Further, a rod 34 connected to a lower end of an arm 33 hanging down from a support plate 32 via a spring 31 inside a cylinder 30 fixed to a bracket 29, and an adjusting screw 35 engaged with a female screw portion at the cylinder end. The reaction force of the spring 31 can be adjusted by operating the adjusting screw 35 so as to oppose the adjusting screw 35.

[Brief description of the drawings]

FIG. 1 is a plan view

FIG. 2 is a view taken in the direction of arrows 〓-〓 in FIG.

FIG. 3 is a view of another embodiment of the seat plate in plan view.

FIG. 4 is a view of another embodiment of the elastic body

FIG. 5 is an explanatory view of a conventional example.

[Explanation of symbols]

10 ... bag storage frame 14 ... seat plate 15 ... bag 18 ...
‥ Vacuum cup 21… ‥ Notch 23… ‥ Elastic body 2
5 ‥ Pin 32 ‥ Support plate 31 ‥ Coil spring 35 ‥ Spring reaction force adjusting means

Claims (3)

[Claims] 1. An apparatus for arranging a large number of bags in a stack in a bag storage frame having an open top surface, and taking out one of the bags one by one from the bag storage frame by suctioning a side of the bag with a vacuum cup. Each of the bags is mounted on the seat plate in the bag housing frame, and the width of the seat plate is reduced from the bag width at least on the side where the vacuum cup acts, and the bag protrudes from the seat plate to the reduced portion. Is applied to an elastic body protruding from the seat plate to the reduced portion, and the upper surface of the bag is held flat by an elastic biasing force acting upwardly on the elastic body to support the weight of the bag corner. how to. 2. A large number of bags are arranged in a stack on a seat plate inside a bag housing frame having an open top, and the edges of the bags are sucked by a vacuum cup and taken out of the bag housing frame one by one. Means, at least on the side on which the vacuum cup acts, the bag protruding permitting means formed by reducing the width of the seat plate from the bag width, and support from below the corner portion of the bag protruding from the seat plate to the reduced portion. An apparatus for protruding from the seat plate to the reduced portion and comprising an elastic body having an elastic biasing force in an upward direction to maintain a flat upper surface of the bag. 3. In order to support from below the corner portion of the bag protruding from the seat plate into the reduced portion, the bag is vertically rotated via pins on both side edges of the seat plate so as to protrude from the seat plate to the reduced portion. 3. A support plate provided freely, a coil spring for applying a reaction force in a direction against the weight of the support plate, and means for adjusting the reaction force by changing the entire length of the coil spring. An apparatus for keeping the upper surface of the bag flat according to Claim 1.