JPH0322084Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application This invention relates to an auxiliary device that facilitates opening a flat film tube made of synthetic resin that has been cut into predetermined dimensions into a cylindrical shape.

b. Prior Art When an automatic packaging machine is used to sequentially cover a large number of bottles, cans, etc. with synthetic resin film tubes, the long film tubes are rolled up in a spiral shape in a flat state. After dividing the film into predetermined lengths starting from the tip, they are opened into a cylindrical shape and fitted into a predetermined body or cap, but the length of the film tube that has been cut into predetermined lengths is longer. The closer the opening, the more difficult it becomes for air to flow into the interior, making it difficult to open.

Therefore, as in the conventional method, some air is allowed to flow into the flat surfaces of the tube before and after the tube is separated by sandwiching the tube between the opposing surfaces of a pair of negative pressure suction blocks (not shown). If this is done, the above-mentioned opening operation will become extremely easy and reliable, and troubles such as opening errors will be avoided.

c. Purpose of the invention On the other hand, there is a conventionally known means for opening the bag opening by shifting the bag surface sideways by applying force that presses a leaf spring against the side surface of the bag. However, with this method, it is difficult to intervene with a negative pressure suction block used in a subsequent process.

In view of the above-mentioned needs, the purpose of this invention was to create a simple and inexpensive design that would ultimately allow air to flow into the flat film tube in a retracted position while also securing space for post-processing equipment to intervene. An object of the present invention is to provide a film tube opening assisting device.

d. Structure of the device This device provides a support shaft that can be moved forward and backward relative to a surface on which a flat film tube can be placed under suction, and each base end of a pair of links is pivotally supported on the support shaft. Further, a pair of rollers is attached to the spindle on the free end of each of the links via a one-way clutch that can rotate only inwardly, so that each of the pair of links is displaced in a direction in which both of the links close inwardly. The device is equipped with a forced elastic means, and its action is such that the pair of rollers come into contact with the surface as the support shaft moves forward, and the rollers move away from each other due to this contact. After being rotationally displaced, when the pair of rollers are moved toward each other along the surface by the action of the elastic means as the support shaft retreats, the one-way clutch causes the pair of rollers to move closer to each other along the surface. By inhibiting the rotation of the film tube, the film tube on the surface is wrinkled between the pair of rollers.

e Example In the figure, a flat film tube 4 is suctioned and placed on a wall surface 6 where an air intake hole 5 is opened.

The common support shaft 7 can be reciprocated in the far and near directions with respect to the wall surface 6 by operating, for example, a link 8.

A pair of links 9 and 10 having the same length are respectively pivotally supported at their base ends by the common support shaft 7, and a one-way clutch is attached to the support shafts 11 and 12 on their respective free ends. Rollers 15 and 16 having the same diameter are attached via 13 and 14, respectively.

The pair of one-way clutches are free to rotate only in the direction of the arrow shown in FIG. 2, that is, in the counterclockwise direction on the right side.
The left side is only free to rotate in the direction of the hour hand.

A tension spring 17 is installed between the pair of links 9 and 10 for automatic return after expansion.

In FIG. 1, when the support shaft 7 is displaced toward the wall surface 6 by the link 8, the pair of rollers 15 and 16 hit the flat film tube 4 that is suctioned and retained on the wall surface 6, and are prevented from advancing. The forward force is changed to a spreading force, and the pair of rollers 15 and 16 are displaced on the flat film tube 4 in a direction away from each other.

During the separation, the one-way clutches 13 and 14 allow the rollers 15 and 16 to roll, so that smooth separation is possible (see FIG. 2).

After the expansion operation of the pair of links 9 and 10 reaches its limit against the force of the spring 17, when the link 8 enters the return operation, first, the expanded pair of links 9 and 10 Returned with the power of
Along with this, the pair of rollers 15 and 16 return toward each other.

However, when the pair of rollers 15 and 16 are displaced close to each other, the one-way clutches 13 and 14 do not allow the rollers to roll, so the peripheral surface of each roller acts as a brake and forces the flat film tube 4 while rubbing against it. Return.

A pair of rollers 15 and 16 during this return
The contact side surface of the flat film tube 4 is wrinkled toward the center by the friction of The opening operation is extremely simple and reliable, and there is no possibility of opening mistakes.

Rollers 15 and 16 have returned to a certain position
is separated from the surface of the tube 4 as the link 8 further returns.

f Effects of the invention The invention has a pair of expandable rollers 15 and 1.
6, a pair of one-way clutches 13 and 14 rotatable only in opposite directions, and a return spring 17.
By combining this with the reciprocating displacement means, the film tube surface is pinched by the squeezing force generated as it retreats, and air can easily and reliably flow into the flat film tube 4 just before it enters the opening process. This makes it easier to open the tube in the future and reduces the possibility of opening errors, which brings great benefits to the tube packaging industry.

[Brief explanation of the drawing]

The drawings are explanatory diagrams illustrating a specific embodiment of the present invention and sequentially showing its operation, in which Fig. 1 shows the state before operation, Fig. 2 shows the state during operation, and Fig. 3 shows the state after the operation is completed. Indicates the condition. 4...Flat film tube, 5...Intake hole,
6...Wall surface, 7...Common pivot, 8...Link,
9 and 10...a pair of links of the same length, 11 and 1
2... Support shaft, 13 and 14... A pair of one-way clutches, 15 and 16... A pair of rollers with the same diameter, 17
...Return spring.

Claims (1)

[Claims for Utility Model Registration] A surface on which a flat film tube can be placed by suction, a support shaft that can be moved forward and backward relative to the surface, and each base end portion of the film tube is pivotally supported on the support shaft. a pair of links; a pair of rollers each attached to a spindle on a free end of each link via a one-way clutch rotatable only inwardly; and both of the pair of links close inwardly. an elastic means that is forced to undergo an angular displacement in a direction, and as the support shaft moves forward, the pair of rollers abuts on the surface, and due to the abutment, the pair of rollers are rotationally displaced in a direction away from each other. After that, when the pair of rollers are moved toward each other along the surface by the action of the elastic means as the support shaft retreats,
A flat film tube opening auxiliary device characterized in that the film tube on the surface is wrinkled between the pair of rollers by inhibiting rotation of the pair of rollers by the action of the one-way clutch.